Battery top cover

Abstract

The utility model provides a battery top cover which comprises a cover plate provided with a mounting groove and a sealing piece, the sealing piece is mounted in the mounting groove, and a liquid injection hole is formed in the bottom wall of the mounting groove. Wherein a containing groove is formed between the cover plate and the sealing piece, and a bonding medium is arranged in the containing groove. According to the battery top cover provided by the embodiment of the invention, the accommodating groove filled with the bonding medium is formed between the cover plate and the sealing piece, and the sealing piece can be tightly fixed in the mounting groove by the bonding medium, so that the liquid injection hole is sealed and covered by the sealing piece, and meanwhile, a gap between the sealing piece and the mounting groove can be effectively filled so as to ensure the air tightness in the battery cell. The battery top cover provided by the embodiment does not depend on a welding device to weld the sealing piece in the mounting groove to seal the liquid injection hole any more, so that the production process of the battery top cover is simpler and more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, concretely relates to a battery top cover. BACKGROUND

[0002] In the production process of the battery cell, it is usually necessary to open a liquid injection hole on the top cover of the battery cell to inject electrolyte into the battery cell, and the liquid injection hole needs to be sealed after the injection is completed. The commonly used method at present is to weld the sealing piece at the liquid injection hole by welding, so that the sealing piece completely seals the liquid injection hole. However, this sealing method has the following defects: in the welding process, the sealing piece is easily affected by environmental factors, and under certain conditions, it will cause the problem of insufficient sealing at the welding position. SUMMARY

[0003] The embodiment of the utility model provides a battery top cover, can solve the problem that the sealing piece seals the liquid injection hole by welding and easily causes insufficient sealing at the welding position.

[0004] In one embodiment, the sealing piece includes a first wall facing the cover plate, the cover plate includes a second wall facing the sealing piece, and the receiving groove is provided in at least one of the first wall and the second wall.

[0005] In one embodiment, the sealing piece includes a first wall facing the cover plate, the cover plate includes a second wall facing the sealing piece, and the receiving groove is provided in at least one of the first wall and the second wall.

[0006] In one embodiment, the receiving groove is located between the side wall of the mounting groove and the liquid injection hole.

[0007] In one embodiment, the receiving groove is located between the side wall of the mounting groove and the liquid injection hole.

[0008] In one embodiment, a gap is provided between the side wall of the mounting groove and the sealing piece, and the receiving groove communicates with the gap.

[0009] In one embodiment, the cover plate is provided with a first receiving groove and a second receiving groove, and the first receiving groove and the second receiving groove are arranged in a spaced manner; a gap is provided between the side wall of the mounting groove and the sealing piece; wherein the first receiving groove communicates with the gap, and the second receiving groove is located on the side of the first receiving groove close to the liquid injection hole.

[0010] In one embodiment, the gap is provided with an adhesive medium, and the adhesive medium in the gap and the adhesive medium in the receiving groove are of an integral structure.

[0011] In one embodiment, the gap is provided with an adhesive medium, and the adhesive medium in the gap and the adhesive medium in the receiving groove are of an integral structure.

[0012] In one embodiment, the receiving groove and the side wall of the mounting groove are arranged in a spaced manner.

[0013] In an embodiment, the bottom wall of the mounting groove comprises a bottom plane and a bottom inclined surface connected to the inner edge of the bottom plane, the bottom plane is provided with the liquid injection hole, and the bottom inclined surface is inclined relative to the bottom plane; the sealing member comprises an abutting inclined surface; wherein the bottom inclined surface abuts against the abutting inclined surface, and the containing groove is located between the abutting inclined surface and the side wall of the mounting groove.

[0014] In an embodiment, the cover plate comprises a protrusion, the inner side surface of the protrusion forms the bottom inclined surface; wherein the top of the protrusion abuts against the sealing member, and the containing groove is located between the outer side surface of the protrusion and the side wall of the mounting groove.

[0015] In an embodiment, the containing groove is provided on the cover plate, or the containing groove is provided on the sealing member, or the cover plate and the sealing member jointly enclose the containing groove.

[0016] The utility model provides a kind of battery top cover, and the battery top cover includes the cover plate and sealing member with mounting groove, sealing member is installed in mounting groove, and the bottom wall of mounting groove is provided with liquid injection hole.Therein, containing groove is provided between cover plate and sealing member, and containing groove is provided with adhesive medium.This embodiment provides battery top cover, by being provided with containing groove with adhesive medium between cover plate and sealing member, adhesive medium can be tightly fixed in mounting groove with sealing member, so that sealing member covers liquid injection hole, simultaneously still can effectively fill the gap between sealing member and mounting groove, to ensure the airtightness of the inside of electric core.This embodiment provides battery top cover, no longer rely on welding device to be welded in mounting groove with sealing member to seal liquid injection hole, so that the production process of battery top cover is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0018] Figure 1 It is the structure diagram of battery top cover provided by the utility model embodiment;

[0019] Figure 2 It is the sectional view of a kind of battery top cover provided by the utility model embodiment;

[0020] Figure 3 It is Figure 2 The enlarged view of part A in it;

[0021] Figure 4 It is the sectional view of a kind of battery top cover provided by the utility model embodiment;

[0022] Figure 5 It isFigure 4 Enlarged view of middle B part;

[0023] Figure 6 is a sectional view of a battery top cover provided by an embodiment of the present application;

[0024] Figure 7 is Figure 6 Enlarged view of middle C part;

[0025] Figure 8 is a sectional view of a battery top cover provided by an embodiment of the present application;

[0026] Figure 9 is Figure 8 Enlarged view of middle D part;

[0027] Figure 10 is a sectional view of a battery top cover provided by an embodiment of the present application;

[0028] Figure 11 is Figure 10 Enlarged view of middle E part;

[0029] Figure 12 is a sectional view of a battery top cover 100 provided by an embodiment of the present application;

[0030] Figure 13 is Figure 12 Enlarged view of middle F part;

[0031] Figure 14 is a sectional view of a battery top cover 100 provided by an embodiment of the present application;

[0032] Figure 15 is Figure 14 Enlarged view of middle G part;

[0033] Figure 16 is a sectional view of a battery top cover 100 provided by an embodiment of the present application;

[0034] Figure 17 is Figure 16 Enlarged view of middle H part;

[0035] Explanation of reference signs:

[0036] 100, battery top cover; 110, cover plate; 111, mounting groove; 112, liquid injection hole; 120, sealing member; 130, accommodating groove; 140, gap; 151, bottom flat surface; 152, bottom inclined surface; 160, protrusion. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower directions of the device in the actual use or working state, and specifically refer to the drawing direction in the drawings. The "inner" and "outer" refer to the outline of the device.

[0038] In order to solve the problem that the sealing performance of the welding part is insufficient when the sealing part is fixed at the liquid injection hole by welding in the related art, the embodiments of the present application provide a battery top cover 100, please refer to Figures 1 to 3 , Figure 1 is a structural schematic diagram of a battery top cover 100 provided by the embodiments of the present application, Figure 2 is a sectional view of a battery top cover 100 provided by the embodiments of the present application, Figure 3 is Figure 2 The cover plate 110 is connected with the battery cell shell to effectively seal the inside of the battery cell. The surface of the cover plate 110 is provided with a mounting groove 111, and the mounting groove 111 is used for mounting the sealing part 120. The bottom wall surrounding the mounting groove 111 is provided with a liquid injection hole 112, and the liquid injection hole 112 is directly communicated with the inside of the battery cell. The electrolyte is injected into the inside of the battery cell through the liquid injection hole 112. The sealing part 120 is used to close the liquid injection hole 112 after the electrolyte is injected, to prevent the electrolyte from overflowing and the external pollutants from entering the inside of the battery cell. The sealing part 120 is usually designed with corrosion-resistant materials to resist the corrosion of the electrolyte, thereby prolonging the service life of the battery.

[0039] A containing groove 130 is arranged between the sealing part 120 and the mounting groove 111 of the cover plate 110, and the containing groove 130 provides a better fixing mode for the sealing part 120. Specifically, the containing groove 130 is filled with an adhesive medium to ensure that the sealing part 120 is tightly combined with the mounting groove 111.

[0040] The presence of the bonding medium not only enhances the stability of the sealing piece 120, but also ensures the air tightness of the battery cell. The bonding medium can effectively fill the small gap between the sealing piece 120 and the mounting groove 111, preventing the electrolyte from leaking in a high-temperature or high-pressure environment. In this way, the air tightness of the battery cell is ensured, and the electrolyte is prevented from overflowing through the gap between the sealing piece 120 and the mounting groove 111, thereby improving the safety and reliability of the battery. The design of the battery top cover 100 provided in this embodiment ensures the safety and reliability of the battery cell through the cover plate 110, the mounting groove 111, the liquid injection hole 112, the sealing piece 120, and the containing groove 130 and the bonding medium.

[0041] In some embodiments, the containing groove 130 is arranged around the liquid injection hole 112. The containing groove 130 is arranged as an annular groove structure around the liquid injection hole 112, and its shape can be flexibly selected according to actual needs. Typically, a circular ring or a square ring is used to facilitate processing and installation. The containing groove 130 can also adopt other shapes that are convenient for processing. This structural design not only meets the structural requirements, but also effectively adapts to different production processes and manufacturing equipment.

[0042] The bonding medium in this embodiment is a high-performance composite polymer material. The bonding medium can be made of an aluminum alloy powder and a resin composite, so that the bonding medium has excellent bonding performance and durability. The bonding medium is in a paste form, which is an intermediate body connecting the sealing piece 120 and the mounting groove 111, and has a strong viscosity, which can tightly fix the sealing piece 120 in the mounting groove 111, ensuring that the sealing piece 120 is not easily detached or displaced. The bonding medium can also be made of an aluminum powder and a resin composite, so that the bonding medium has good corrosion resistance and can effectively resist the corrosion of the electrolyte.

[0043] The battery top cover 100 provided in this embodiment significantly improves the stability and sealing performance of the overall structure by arranging the containing groove 130 filled with the bonding medium between the cover plate 110 and the sealing piece 120. The bonding medium can tightly fix the sealing piece 120 in the mounting groove 111, so that the sealing piece 120 effectively covers the liquid injection hole 112, preventing the leakage of the electrolyte and the invasion of external contaminants. In addition, the presence of the bonding medium can effectively fill the small gap between the sealing piece 120 and the mounting groove 111, thereby ensuring the air tightness of the battery cell, improving the safety and reliability of the battery cell, and prolonging its service life.

[0044] Compared with related technologies, the battery top cover 100 provided in this embodiment no longer relies on a welding device to weld the sealing piece 120 to the mounting groove 111 to seal the liquid injection hole 112, thereby making the production process of the battery top cover more simple and efficient, and eliminating the complex equipment and procedures required for traditional welding, thereby significantly improving the production efficiency.

[0045] In the past welding method, the welding process not only needs professional equipment, but also needs to go through strict operation procedures, these operation procedures not only time-consuming, but also requires high technical level of the operator, increases the uncertainty in production. In addition, due to the high temperature involved in the welding process, the heat affected zone of the welding area may cause the physical properties of the material to change, thereby affecting the air tightness of the overall structure. Specifically, welding defects such as pores, uneven welds and other problems often lead to insufficient air tightness, and may even cause internal leakage or short circuit risk of the battery. In contrast, the bonding method adopted in the embodiment significantly reduces the occurrence of the above potential problems. The bonding medium has good adaptability and can maintain excellent sealing effect when the temperature changes or the external pressure fluctuates, which can ensure stable air tightness in different working environments and provide protection for the long-term stable operation of the battery.

[0046] In addition, the application of the bonding medium also has high flexibility. In the production process, the coating amount of the bonding medium can be flexibly adjusted according to different models and specifications to ensure that the best bonding effect is obtained between each sealing piece 120 and the mounting groove 111.

[0047] In summary, the battery top cover 100 provided by the embodiment has obvious advantages in structural design. It not only simplifies the production process and improves the production efficiency, but also effectively enhances the air tightness of the battery cell and reduces the potential defect risk caused by welding.

[0048] The mounting groove 111 provided on the cover plate 110 is surrounded by a side wall and a bottom wall, and the liquid injection hole 112 is provided on the bottom wall. In some embodiments, in order to improve the sealing effect and bonding strength, the accommodation groove 130 is designed to be located between the side wall and the liquid injection hole 112, the sealing piece 120 includes a first wall facing the cover plate 110, the cover plate 110 includes a second wall facing the sealing piece 120, and the accommodation groove 130 is provided in at least one of the first wall and the second wall. Specifically, the design of the accommodation groove 130 has flexibility and can be set at multiple positions according to actual needs. These positions include the side wall and the bottom wall of the mounting groove 111, and even can be set on the sealing piece 120 itself. Through this diversified design, the accommodation groove 130 can effectively adjust its shape and size to adapt to the production needs of different models of batteries. In addition, the accommodation groove 130 can also be understood as a space surrounded by the mounting groove 111 and the sealing piece 120.

[0049] In the embodiment, when the accommodating groove 130 is arranged at any position, the adhesive medium in the accommodating groove 130 can significantly enhance the adhesive strength between the sealing piece 120 and the mounting groove 111. Such design ensures that the air tightness between the sealing piece 120 and the side wall is not easily affected, thereby ensuring the sealing performance of the liquid injection hole 112. Through the structural design, the sealing piece 120 can be tightly mounted in the mounting groove 111 through the adhesive medium, effectively covering the liquid injection hole 112. This structural design not only prevents the leakage of electrolyte, but also avoids the entry of external pollutants into the battery cell, ensuring the safety of the internal environment of the battery cell.

[0050] In some embodiments, referring to Figure 4 、 Figure 5 , Figure 4 is a sectional view of a battery top cover 100 provided by the embodiment of the utility model, Figure 5 is Figure 4 An enlarged view of part B. The accommodating groove 130 is arranged with a certain interval between the side wall of the mounting groove 111, that is, there is a certain distance between the opening of the accommodating groove 130 and the side wall of the mounting groove 111. Specifically, the adhesive medium in the accommodating groove 130 can effectively fix the sealing piece 120 in the mounting groove 111, but due to the existence of a small gap between the sealing piece 120 and the mounting groove 111, it may affect the air tightness between the sealing piece 120 and the liquid injection hole 112. Through the structural design in the embodiment, that is, a certain interval is designed between the accommodating groove 130 and the side wall of the mounting groove 111, the air tightness between the accommodating groove 130 and the side wall of the mounting groove 111 can be ensured to be weak, so as to ensure the air tightness between the sealing piece 120 and the liquid injection hole 112. The advantage of this structural design is that it can reduce the air flow between the accommodating groove 130 and the outside to a certain extent. When the air flow is weak, it can effectively prevent the outside air from entering the battery, and also avoid the leakage of electrolyte. Therefore, the air tightness between the sealing piece 120 and the liquid injection hole 112 is effectively guaranteed.

[0051] The accommodating medium arranged in the accommodating groove 130 can not only tightly adhere the sealing piece 120 in the mounting groove 111 to ensure the air tightness between the sealing piece 120 and the liquid injection hole 112 to a large extent, but also can fill the gap between the sealing piece 120 and the mounting groove 111 to further enhance the air tightness between the sealing piece 120 and the liquid injection hole 112.

[0052] In order to ensure that the sealing member 120 can be tightly bonded to the mounting groove 111, it is necessary to set sufficient bonding medium in the accommodating groove 130, and after the bonding medium is loaded into the accommodating groove 130, the sealing member 120 is accurately installed in the mounting groove 111, so that the bonding medium in the accommodating groove 130 is in full contact with the sealing member 120, so as to enhance the bonding strength with the mounting groove 111. In the process of installing the sealing member 120 to the mounting groove 111, because the amount of bonding medium used is relatively sufficient, when the sealing member 120 contacts the mounting groove 111, part of the bonding medium will often overflow from the accommodating groove 130, and the overflowed bonding medium may interfere with the surrounding elements.

[0053] In order to solve this problem, in some embodiments, referring to Figure 3 , a gap 140 is provided between the side wall of the mounting groove 111 and the sealing member 120, and the accommodating groove 130 is in communication with the gap 140. The gap 140 is designed to provide sufficient space to accommodate the overflowed bonding medium, thereby effectively preventing it from interfering with other elements. The existence of the gap 140 not only can avoid the pollution of the overflowed bonding medium to the internal environment of the mounting groove 111, but also helps to maintain the appropriate pressure between the sealing member 120 and the mounting groove 111. This design makes the sealing member 120 still maintain good position stability even in the case of partial overflow of the bonding agent, which helps to improve the sealing performance and reliability of the overall structure. The present embodiment can effectively improve the bonding strength of the sealing member 120 by providing the gap 140 between the side wall of the mounting groove 111 and the sealing member 120 and reasonably configuring the bonding medium, and ensure the stability and safety of the sealing member 120 in use.

[0054] In some embodiments, referring to Figure 6 , Figure 7 , Figure 6 is a sectional view of a battery top cover 100 provided by the utility model embodiment, Figure 7 is Figure 6Enlarged view of the middle C portion. The cover plate 110 is provided with two accommodating grooves 130, namely a first accommodating groove and a second accommodating groove, which are kept at a certain interval and are arranged around the liquid injection hole 112, and a gap 140 is reserved between the side wall of the mounting groove 111 and the sealing member 120. The first accommodating groove is directly communicated with the gap 140, while the second accommodating groove is located on the side of the first accommodating groove close to the liquid injection hole 112. Specifically, before the sealing member 120 is installed, an appropriate amount of adhesive medium needs to be filled in the first accommodating groove close to the side wall of the mounting groove 111. Then the sealing member 120 is installed into the mounting groove 111, and during the installation process, the pressing of the sealing member 120 on the mounting groove 111 can cause part of the adhesive medium to overflow from the first accommodating groove. Therefore, the embodiment reserves the gap 140 on both sides of the first accommodating groove and configures the second accommodating groove to accommodate the overflowed adhesive medium. On the one hand, these designs can effectively accommodate the excess adhesive medium and avoid interference of the overflowed adhesive medium with other surrounding components. On the other hand, the design also increases the contact area of the adhesive medium between the sealing member 120 and the mounting groove 111, thereby significantly enhancing the bonding strength between the sealing member 120 and the mounting groove 111.

[0055] Considering the structure of the mounting groove 111 and the effective combination of the sealing member 120, in some embodiments, the gap 140 between the side wall of the mounting groove 111 and the sealing member 120 is provided with adhesive medium. The adhesive medium in the gap 140 and the adhesive medium in the accommodating groove 130 are in an integral structure. Based on the filling of the adhesive medium in the accommodating groove 130, the embodiment further adds adhesive medium in the gap 140 between the side wall of the mounting groove 111 and the sealing member 120. This design not only enhances the bonding strength between the sealing member 120 and the mounting groove 111, but also enhances the stability by increasing the bonding area. By using adhesive medium in both key positions, it is ensured that the sealing member 120 can be firmly fixed in the groove after installation, and the risk of insufficient air tightness between the sealing member 120 and the liquid injection hole 112 due to external force is reduced. In addition, the adhesive medium in the gap 140 and the adhesive medium in the accommodating groove 130 form an integral structure, so that the adhesive medium can fill the gap between the sealing member 120 and the mounting groove 111 to a large extent, thereby enhancing the air tightness between them.

[0056] In addition, the adhesive medium in the gap 140 and the adhesive medium in the accommodating groove 130 can also be separately provided to reduce the mutual influence between them, thereby ensuring the air tightness between the sealing member 120 and the liquid injection hole 112.

[0057] In some embodiments, please refer to Figure 8 , Figure 9 , Figure 8is a sectional view of a battery top cover 100 provided by the embodiment of the utility model, Figure 9 is Figure 8 The bottom wall of the mounting groove 111 is composed of a bottom plane 151 and a bottom inclined plane 152, and the bottom inclined plane 152 is connected to one side of the side wall of the mounting groove 111 away from the bottom plane 151 and presents a certain inclined angle relative to the bottom plane 151.

[0058] The bottom plane 151 is located between the side wall of the mounting groove 111 and the bottom inclined plane 152, one side of the bottom plane 151 is connected to the side wall of the mounting groove 111, and the other side of the bottom plane 151 is connected to the bottom inclined plane 152, and the liquid injection hole 112 is arranged on the bottom inclined plane 152. The sealing member 120 comprises an abutting inclined plane abutting against the bottom inclined plane 152 of the mounting groove 111, and the containing groove 130 is located between the abutting inclined plane and the side wall of the mounting groove 111.

[0059] The embodiment sets the containing groove 130 between the abutting inclined plane and the side wall of the mounting groove 111, so that the adhesive medium can tightly bond the sealing member 120 to the mounting groove 111, and in addition, the bottom inclined plane 152 inclined relative to the bottom plane 151 plays a guiding role in the installation process of the sealing member 120. When the technician installs the sealing member 120, the inclined design of the bottom inclined plane 152 can guide the sealing member 120 to slide into the mounting groove 111 along the correct path, so that the installation process is simplified, the potential problems caused by the wrong alignment are reduced, and the installation efficiency and accuracy are improved.

[0060] In summary, the embodiment reasonably designs the bottom wall structure of the mounting groove 111 and the structure of the sealing member 120, so as to ensure the sealing property between the sealing member 120 and the liquid injection hole 112. At the same time, the inclined design of the bottom inclined plane 152 provides guiding support for the installation of the sealing member 120, so that the whole battery top cover 100 is more efficient in the production process.

[0061] In some embodiments, please refer to Figure 10 、 Figure 11 , Figure 10 is a sectional view of a battery top cover 100 provided by the embodiment of the utility model, Figure 11 is Figure 10The enlarged view of the middle E part. The cover plate 110 includes a protrusion 160, which is close to the inner side of the liquid injection hole 112 as the bottom inclined surface 152 as described above, and the top of the protrusion 160 is closely abutted to the sealing member 120, which ensures that the gap between the two is small, thereby achieving effective sealing. The containing groove 130 is arranged between the outer side of the protrusion 160 away from the liquid injection hole 112 and the side wall of the mounting groove 111, and is used to store the bonding medium. The protrusion 160 structure in the embodiment not only can provide support for the sealing member 120, but also can effectively prevent the bonding medium from entering the gap between the bottom inclined surface 152 and the sealing member 120, thereby reducing the risk of the bonding medium penetrating into the inside of the battery cell and avoiding potential failure or performance degradation caused by the flow of the bonding medium into the battery cell.

[0062] In some embodiments, the containing groove 130 can also be arranged on the sealing member 120.

[0063] For example, in an embodiment, referring to Figure 12 、 Figure 13 , Figure 12 is a sectional view of a battery top cover 100 provided by the embodiment of the utility model, Figure 13 is Figure 12 the enlarged view of the middle F part. The containing groove 130 is arranged on the side of the sealing member 120 facing the mounting groove 111, and the containing groove 130 and the side wall of the mounting groove 111 are arranged at intervals, that is, a certain interval is designed between the containing groove 130 and the side wall of the mounting groove 111.

[0064] Through the structural design in the embodiment, that is, a certain interval is designed between the containing groove 130 and the side wall of the mounting groove 111, the gas communication between the containing groove 130 and the side wall of the mounting groove 111 can be ensured to be weak, so as to ensure the air tightness between the sealing member 120 and the liquid injection hole 112. The advantage of the structural design is that the gas flow between the containing groove 130 and the outside can be reduced to a certain extent. When the gas flow is weak, the outside air can be effectively prevented from entering the inside of the battery, and the leakage of the electrolyte can also be avoided. Therefore, the air tightness between the sealing member 120 and the liquid injection hole 112 is effectively guaranteed.

[0065] In another embodiment, referring to Figure 14 、 Figure 15 , Figure 14 is a sectional view of a battery top cover 100 provided by the embodiment of the utility model, Figure 15 is Figure 14The enlarged view of the middle G part, the accommodating groove 130 is arranged on the sealing member 120, and a gap 140 is arranged between the side wall of the mounting groove 111 and the sealing member 120, the accommodating groove 130 is communicated with the gap 140, and the gap 140 is used for providing sufficient space to accommodate the overflowed adhesive medium, so that the adhesive medium is effectively prevented from interfering with other elements. The existence of the gap 140 can avoid the pollution of the internal environment of the mounting groove 111 caused by the overflow of the adhesive medium, and also helps to maintain the proper pressure between the sealing member 120 and the mounting groove 111. The design makes the sealing member 120 still have good position stability even in the case of partial overflow of the adhesive, and helps to improve the sealing performance and reliability of the overall structure.

[0066] In another embodiment, referring to Figure 16 、 Figure 17 , Figure 16 is a sectional view of a battery top cover 100 provided by the utility model embodiment, Figure 17 is Figure 16 The enlarged view of the middle H part, the sealing member 120 is provided with two accommodating grooves 130, and the two accommodating grooves 130 are kept at a certain interval and are arranged around the liquid injection hole 112, and a gap 140 is reserved between the side wall of the mounting groove 111 and the sealing member 120. One of the accommodating grooves 130 is directly communicated with the gap 140, and the other accommodating groove 130 is located on the side of the accommodating groove 130 close to the liquid injection hole 112, and the overflowed adhesive medium is accommodated by reserving the gap 140 on both sides of one of the accommodating grooves 130 and arranging the other accommodating groove 130.

[0067] The utility model provides a kind of battery top cover 100, by being provided with containing groove 130 of being equipped with bonding medium between cover plate 110 and sealing piece 120, bonding medium can be tightly fixed in mounting groove 111 with sealing piece 120, so that sealing piece 120 covers injection hole 112, simultaneously still can effectively fill the gap between sealing piece 120 and mounting groove 111, to ensure the air tightness inside battery cell. Compared with related art, on the one hand, the battery top cover 100 of the embodiment no longer relies on welding device to weld sealing piece 120 in mounting groove 111 to seal injection hole 112, so that the production process of battery top cover 100 is more convenient, and the equipment and process required for welding are saved, greatly improve production efficiency, while the battery top cover 100 of the embodiment can also avoid the welding defects that may occur in the welding process of related art, such as the problem of insufficient air tightness caused by the presence of pores or uneven weld. On the other hand, the design of bonding medium can also maintain good sealing effect when temperature changes or external pressure changes. Because welding method may cause physical property changes of material due to heat effect, thereby affecting air tightness, and bonding medium can make up for this deficiency to provide more stable sealing performance. In summary, the battery top cover 100 provided by the embodiment has obvious advantages in structural design, not only simplifies production process and improves production efficiency, but also effectively enhances the air tightness of battery cell and reduces the potential defect risk caused by welding.

[0068] The above detailed introduction is made to the embodiments of the utility model, and the principle and implementation mode of the utility model are described by applying specific examples; the above embodiment description is only used to help understand the method and core idea of the utility model; meanwhile, for those skilled in the art, according to the idea of the utility model, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the utility model.

Claims

1. A battery top cover characterized by, The application relates to a cover plate and a sealing element. The cover plate is provided with a mounting groove, and a bottom wall of the mounting groove is provided with a liquid injection hole. The sealing element is mounted in the mounting groove. A containing groove is arranged between the cover plate and the sealing element, and an adhesive medium is arranged in the containing groove. The sealing element comprises a first wall facing the cover plate, the cover plate comprises a second wall facing the sealing element, and the containing groove is arranged in at least one of the first wall and the second wall.

2. The battery header of claim 1, wherein, The containing groove is arranged between the side wall of the mounting groove and the liquid injection hole.

3. The battery header of claim 2, wherein, The containing groove is arranged around the liquid injection hole.

4. The battery cup of claim 2, wherein: A gap is arranged between the side wall of the mounting groove and the sealing element, and the containing groove is communicated with the gap.

5. The battery cover of claim 2, wherein, The cover plate is provided with a first containing groove and a second containing groove, and the first containing groove and the second containing groove are arranged in a spaced mode.

6. The battery cover of claim 4 or 5, wherein the cover includes a plurality of protrusions extending from the cover, the protrusions being configured to engage the battery. The gap is arranged between the side wall of the mounting groove and the sealing element.

7. The battery cover of claim 4 or 5, wherein the cover includes a plurality of protrusions extending from the cover, the protrusions being configured to engage the battery. The adhesive medium in the gap and the adhesive medium in the containing groove are in an integrated structure.

8. The battery header of claim 2, wherein, The adhesive medium in the gap and the adhesive medium in the containing groove are arranged in a split mode.

9. The battery cover of claim 2, wherein, The containing groove is arranged in a spaced mode with the side wall of the mounting groove.

10. The battery header of claim 9, wherein, The bottom wall of the mounting groove comprises a bottom plane and a bottom inclined surface connected to the inner edge of the bottom plane, the bottom plane is provided with the liquid injection hole, the bottom inclined surface is inclined relative to the bottom plane, the sealing element comprises an abutting inclined surface, the bottom inclined surface is abutted to the abutting inclined surface, and the containing groove is arranged between the abutting inclined surface and the side wall of the mounting groove.

11. The battery cover of any one of claims 1-5, wherein, The cover plate comprises a protrusion, the inner side surface of the protrusion forms the bottom inclined surface, the top of the protrusion is abutted to the sealing element, and the containing groove is arranged between the outer side surface of the protrusion and the side wall of the mounting groove. The containing groove is arranged in the cover plate, or the containing groove is arranged in the sealing element, or the containing groove is jointly formed by the cover plate and the sealing element.

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