Cover plate structure and battery

Abstract

The application discloses a cover plate structure and a battery. The cover plate structure comprises a top cover and a terminal. The top cover is provided with a liquid injection hole penetrating through opposite surfaces thereof. The terminal comprises a terminal cover part and a blocking part. The terminal cover part is overlapped with the outer side surface of the top cover. The blocking part is connected to the terminal cover part on the side close to the top cover. The blocking part is at least partially inserted into the liquid injection hole to block the liquid injection hole. The terminal is used for electrically connecting with the battery cell assembly. Compared with the prior art, the terminal and the liquid injection hole are integrated together. The liquid injection hole does not need to be separately opened. The number of openings of the top cover can be reduced. The manufacturing process is reduced. The production cost is reduced. Meanwhile, the terminal blocks the liquid injection hole. The sealing effect is achieved to a certain extent. The sealing treatment of the liquid injection hole is facilitated. The battery adopting the cover plate structure improves the production efficiency of the battery parts. The battery production cost is saved. Good economic benefits are achieved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the new energy battery technical field, in particular to a cover plate structure and a battery. BACKGROUND

[0002] With the continuous development of new energy, the application of lithium batteries in various industries is also more widely. In the related technology, the terminal is a component of the lithium battery for connecting the external circuit, which is the lead-out end of the positive and negative electrodes of the battery and plays a role in conducting current; the lithium battery usually has a liquid injection hole at the top, and after the shell of the battery is assembled, the electrolyte is injected into the battery through the liquid injection hole at the top, and the liquid injection hole is sealed after the liquid injection is completed to prevent the electrolyte from leaking.

[0003] In the related technology, the terminal and the liquid injection hole are independently opened, so the lower plastic and the corresponding part of the bus bar in the top cover structure need to avoid the hole position of the liquid injection hole, which increases the manufacturing cost and improves the difficulty of production design. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides a cover plate structure and a battery, which can integrate the terminal and the liquid injection hole, and reduce the production difficulty.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A cover plate structure includes a top cover and a terminal, the top cover is provided with a liquid injection hole penetrating through the opposite surfaces thereof; the terminal includes a cover portion and a blocking portion, the cover portion is overlapped on the outer side surface of the top cover, the blocking portion is connected to one side of the cover portion close to the top cover, the blocking portion at least partially extends into the liquid injection hole to block the liquid injection hole, and the terminal is used for electrically connecting with a battery cell assembly.

[0007] As one of the embodiments, the cover plate structure includes a sealing element, the sealing element is arranged in the liquid injection hole and abuts against the liquid injection hole to block the liquid injection hole, and the blocking portion abuts against the sealing element.

[0008] As one of the embodiments, the liquid injection hole is formed with a first hole position and a second hole position along the axial direction thereof; along the direction from the first hole position to the second hole position, the first hole position is in a gradually converging state, the blocking portion extends into the first hole position and is matched with the shape of the first hole position, the second hole position is matched with the outer peripheral surface of the sealing element, and the sealing element at least partially extends out of the second hole position.

[0009] As one of the embodiments, the blocking portion includes an abutting surface, the abutting surface is matched with the outer peripheral surface of the sealing element and abuts against the sealing element.

[0010] As one of the embodiments, the cover plate structure comprises a busbar, the busbar comprises a first lap joint, a connecting part and a second lap joint, the first lap joint and the second lap joint are connected to opposite sides of the connecting part respectively, the first lap joint is arranged between the end cover part and the top cover and extends away from the liquid injection hole, the connecting part is arranged on the hole wall of the liquid injection hole in a ring shape, and the second lap joint is lapped on the inner side surface of the top cover.

[0011] As one of the embodiments, the busbar comprises a welding part, the welding part is connected to the first lap joint and extends towards the end cover part along the axial direction of the liquid injection hole, and the welding part is at least partially wrapped around the outer circumferential side of the end cover part.

[0012] As one of the embodiments, the cover plate structure comprises an insulating part, the insulating part is arranged between the busbar and the top cover to separate the busbar and the top cover.

[0013] As one of the embodiments, the insulating part comprises a first insulating part, a second insulating part and a third insulating part, the first insulating part and the third insulating part are connected to opposite sides of the second insulating part respectively; the first insulating part is arranged between the first lap joint and the outer side surface of the top cover, the second insulating part is arranged between the connecting part and the hole wall of the liquid injection hole, and the third insulating part is arranged between the second lap joint and the inner side surface of the top cover; along the axial direction of the liquid injection hole, the length of the first insulating part is greater than the length of the third insulating part, and along the radial direction of the liquid injection hole, the length of the first insulating part is greater than the length of the first lap joint.

[0014] As one of the embodiments, the outer side surface of the top cover is provided with a positioning groove, and the first insulating part is at least partially arranged in the positioning groove; the third insulating part is in contact with the inner side surface of the top cover and extends to the side of the top cover.

[0015] Another object of the present application is to provide a battery comprising the cover plate structure of any one of the above embodiments and a battery shell and an electric core assembly, the battery shell is connected with the cover plate structure, and the electric core assembly is arranged in the battery shell and is electrically connected with the terminal.

[0016] The application has the beneficial effects that the application provides a cover plate structure and a battery. The cover plate structure comprises a top cover and a terminal. The top cover is provided with a liquid injection hole penetrating through opposite surfaces thereof. The terminal comprises a terminal cover portion and a blocking portion. The terminal cover portion is overlapped with an outer side surface of the top cover. The blocking portion is connected to one side of the terminal cover portion close to the top cover. The blocking portion is at least partially inserted into the liquid injection hole to block the liquid injection hole. The terminal is used to be electrically connected with a battery cell assembly. Compared with the prior art, the application integrates the terminal and the liquid injection hole together. The liquid injection hole does not need to be separately opened. The number of openings of the top cover can be reduced. The manufacturing process is reduced. The production cost is reduced. At the same time, the terminal blocks the liquid injection hole. To a certain extent, the sealing effect is achieved. The blocking portion can replace the sealing nail to seal. The use of sealing materials is saved. The sealing treatment of the liquid injection hole is facilitated. The battery adopting the cover plate structure improves the production efficiency of battery parts. The battery production cost is saved. Good economic benefits are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structure schematic view of a cover plate structure of an embodiment of the application is shown.

[0018] Figure 2 A cross-sectional schematic view of a cover plate structure of an embodiment of the application is shown.

[0019] Figure 3 For Figure 2 An enlarged view of A in FIG. 4 is shown.

[0020] Figure 4 For Figure 2 An enlarged view of B in FIG. 4 is shown.

[0021] Figure 5 A cross-sectional schematic view of a top cover of an embodiment of the application is shown.

[0022] Reference signs: X, radial direction; Y, axial direction; 1, top cover; 11, liquid injection hole; 12, positioning groove; 111, first hole position; 112, second hole position;

[0023] 2, sealing member; 3, terminal; 31, terminal cover portion; 32, blocking portion; 321, abutting surface;

[0024] 4, busbar; 41, first overlapping portion; 42, connecting portion; 43, second overlapping portion; 44, welding portion; 5, insulating member; 51, first insulating portion; 52, second insulating portion; 53, third insulating portion. DETAILED DESCRIPTION

[0025] In the present application, the terms "set", "provided with", "connected" should be understood broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "radial", "circumferential", and the like used in this application are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of this application and simplify the description, and are not indicative or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0027] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0028] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application.

[0030] Referring to Figure 1 The battery provided by the embodiments of the present application includes a cover plate structure, a battery shell (not shown in the figure) and a cell assembly (not shown in the figure), the cover plate structure is connected with the battery shell, specifically, the cover plate structure is connected to one side of the battery shell, and the cover plate structure and the battery shell form an installation space, and the installation space is used to install the cell assembly to complete the assembly of the battery.

[0031] Referring to Figure 2The cover plate structure comprises a top cover 1 and a terminal 3, the top cover 1 is provided with a liquid injection hole 11 penetrating through opposite surfaces thereof; the terminal 3 comprises a cover portion 31 and a blocking portion 32, the cover portion 31 is overlapped on the outer side of the top cover 1, the blocking portion 32 is connected to the cover portion 31 on the side close to the top cover 1, the blocking portion 32 is at least partially inserted into the liquid injection hole 11 to block the liquid injection hole 11, and the terminal 3 is electrically connected with the battery cell assembly.

[0032] In actual application, the cover plate structure can be applied to a round lithium battery. After the battery is assembled, the top cover 1 is provided with a liquid injection hole 11, electrolyte is injected through one end of the liquid injection hole 11, and the electrolyte enters the inside of the battery through the other end of the liquid injection hole 11. After the injection of electrolyte is completed, the blocking portion 32 of the terminal 3 is inserted into the liquid injection hole 11 to block the liquid injection hole 11, thereby preventing the electrolyte from leaking. Meanwhile, the cover portion 31 of the terminal 3 can be connected with the top cover 1 to fix the terminal 3, and the terminal 3 is electrically connected with the internal battery cell assembly to conduct the current of the battery cell assembly to the external circuit. Compared with the prior art, the terminal 3 and the liquid injection hole 11 are integrated together, the liquid injection hole 11 does not need to be separately opened, the number of openings of the top cover 1 can be reduced, the manufacturing process is reduced, and the production cost is reduced. Meanwhile, the terminal 3 blocks the liquid injection hole 11, which plays a sealing role to a certain extent, the blocking portion 32 can replace the sealing nail to seal, the use of sealing materials is saved, and the sealing of the liquid injection hole 11 is facilitated. The battery adopting the cover plate structure improves the production efficiency of battery parts, saves the production cost of the battery, and has good economic benefits.

[0033] It should be noted that the terminal 3 of the round lithium battery is a component for connecting the external circuit of the battery. It is the lead-out end of the positive and negative electrodes of the battery, plays a role in conducting current, and enables the battery to supply power to external devices or accept charging from external charging devices.

[0034] A pressure relief valve can also be arranged on the top cover 1. During the use of the lithium battery, the internal pressure of the battery can rise sharply due to various reasons. For example, when overcharged, a series of complex electrochemical reactions occur in the battery, a large amount of gas is generated, and the pressure rises. When the internal pressure exceeds the limit that can be borne by the shell of the battery, the battery has the risk of explosion. The presence of the pressure relief valve can automatically open when the pressure reaches a certain threshold, release the internal gas, and effectively prevent the battery from exploding, thereby protecting the safety of the user and the equipment.

[0035] In an embodiment, the pressure relief valve can be arranged at the center of the top cover 1, so that when the internal pressure of the battery rises, the gas can relatively uniformly diffuse in all directions and be discharged through the pressure relief valve; the pressure relief valve can adopt a reed type pressure relief valve, a bursting disc type pressure relief valve, etc.; the pressure relief valve and the top cover 1 can be connected by clamping or the like.

[0036] Referring to Figure 3 The cover plate structure further comprises a sealing member 2 arranged in the liquid injection hole 11 and abutting against the liquid injection hole 11 to seal the liquid injection hole 11. The sealing portion 32 abuts against the sealing member 2.

[0037] In actual application, the liquid injection hole 11 needs to be sealed after the liquid injection is completed to prevent the electrolyte from leaking. Therefore, in order to further improve the sealing performance of the liquid injection hole 11, the cover plate structure is further provided with the sealing member 2, which is inserted into the liquid injection hole 11 and abuts against the liquid injection hole 11 to achieve the sealing effect. The sealing member 2 is inserted into the opening of the liquid injection hole 11 close to the side of the battery cell assembly, further preventing the electrolyte in the battery from leaking out of the liquid injection hole 11. At the same time, the sealing portion 32 extends into the liquid injection hole 11 from the opening of the liquid injection hole 11 close to the side of the terminal, and plays a role in sealing the liquid injection hole 11. Through the double sealing of the sealing member 2 and the sealing portion 32, the sealing effect of the liquid injection hole 11 is effectively improved.

[0038] Referring to Figure 3 and Figure 4 for a clear description, Figure 3 In X direction refers to the radial direction of the liquid injection hole 11, and Y direction refers to the axial direction of the liquid injection hole 11. The liquid injection hole 11 is formed with a first hole position 111 and a second hole position 112 along the axial direction Y thereof. In the direction from the first hole position 111 to the second hole position 112, the first hole position 111 is in a gradually converging state. The sealing portion 32 extends into the first hole position 111 and is adapted to the shape of the first hole position 111. The second hole position 112 is adapted to the outer circumferential surface of the sealing member 2. The sealing member 2 at least partially extends out of the liquid injection hole 11.

[0039] In actual application, the electrolyte needs to be injected into the battery from the liquid injection hole 11. The first hole position 111 is in a gradually converging state, that is, the first hole position 111 is provided in a conical shape. During the liquid injection, the conical first hole position 111 has a certain flow guiding effect, which can guide the electrolyte to flow more smoothly into the battery. The electrolyte can flow along the inclined surface of the conical hole, reducing the phenomenon of bubbles or liquid accumulation caused by poor flow during the liquid injection process, thereby improving the efficiency and quality of the liquid injection. In addition, the sealing portion 32 is adapted to the shape of the first hole position 111. The conical design of the first hole position 111 can make the sealing portion 32 better fit the inner wall of the liquid injection hole 11. When the sealing portion 32 is inserted into the conical first hole position 111, it will be extruded by the hole wall, thereby forming a tighter seal.

[0040] The second hole site 112 is matched with the outer circumferential surface of the sealing member 2. For example, when the sealing member 2 is a sealing ball, the second hole site 112 is also a ball type. In this way, when the sealing member 2 is inserted into the second hole site 112, the sealing member 2 can be tightly attached to the hole wall of the second hole site 112, so as to achieve a sealing effect. At the same time, the sealing member 2 can be extended from the opening of the liquid injection hole 11 close to the battery cell assembly, so as to better prevent the electrolyte from leaking out of the liquid injection hole 11, better maintain the sealing state, prevent the electrolyte from leaking, and the sealing member 2 extending out of the liquid injection hole 11 facilitates the inspection of the sealing state by the operator, and more intuitively checks the sealing effect, which helps to find sealing defects in time and improves product quality.

[0041] Referring again to Figure 4 , the plugging part 32 includes an abutting surface 321 matched with the outer circumferential surface of the sealing member 2 and abutting with the sealing member 2.

[0042] In actual application, in order to further improve the sealing effect of the liquid injection hole 11, the plugging part 32 extends into the liquid injection hole 11 and abuts with the sealing member 2 in the liquid injection hole 11, so that no gap is generated between the plugging part 32 and the sealing member 2, and the two form a tight seal, effectively enhancing the sealing effect. The side of the plugging part 32 in contact with the sealing member 2 is provided with the abutting surface 321, and the shape of the abutting surface 321 is matched with the shape of the outer circumferential surface of the sealing member 2, so that the abutting surface 321 and the sealing member 2 form a more tight attachment.

[0043] Referring again to Figure 3 , the cover plate structure further includes a bus bar 4, and the bus bar 4 includes a first lap joint part 41, a connecting part 42 and a second lap joint part 43. The first lap joint part 41 and the second lap joint part 43 are respectively connected to opposite sides of the connecting part 42. The first lap joint part 41 is arranged between the end cover part 31 and the top cover 1 and extends away from the liquid injection hole 11. The connecting part 42 is annularly attached to the hole wall of the liquid injection hole 11. The second lap joint part 43 is lap jointed to the inner side surface of the top cover 1.

[0044] It should be noted that the battery usually has multiple tabs, and the bus bar 4 can connect these dispersed tabs together to converge the current collected from each tab. The bus bar 4 provides a wider conductive plane, so that the current can be more uniformly and efficiently conducted, thereby improving the charging and discharging efficiency of the battery.

[0045] Therefore, the application sets the busbar 4, which is arranged between the terminal 3 and the top cover 1. On the one hand, the busbar 4 can be in contact with the terminal 3 and has the function of conducting electricity. On the other hand, the distance between the connecting position of the busbar 4 and the terminal 3 and the liquid injection hole 11 can be increased. Specifically, the busbar 4 comprises a first lap joint part 41, a connecting part 42 and a second lap joint part 43. The first lap joint part 41 is arranged between the end cover part 31 and the top cover 1 and extends away from the liquid injection hole 11. The first lap joint part 41 is mainly used for welding with the terminal 3. Therefore, extending away from the liquid injection hole 11 can increase the distance between the welding position and the liquid injection hole 11, avoid the influence of the welding temperature on the inside of the battery when the busbar 4 is welded with the terminal 3, and also avoid the residual electrolyte in the liquid injection hole 11 from seeping to the welding position, which affects the welding quality. The second lap joint part 43 is lapped on the inner side of the top cover 1 and can mainly be in contact with the internal battery cell. The connecting part 42 is used for connecting the first lap joint part 41 and the second lap joint part 43 to realize the conduction of the current. Meanwhile, the connecting part 42 also penetrates into the liquid injection hole 11, which increases the contact area between the busbar 4 and the terminal 3 and improves the current conduction efficiency.

[0046] It can be understood that the terminal 3 and the busbar 4 are both made of metal materials and have the function of conducting electricity.

[0047] Referring again to Figure 3 , the busbar 4 comprises a welding part 44, which is connected to the first lap joint part 41 and extends along the axial direction of the liquid injection hole 11 and towards the end cover part 31. The welding part 44 is at least partially wrapped around the outer periphery of the end cover part 31.

[0048] In actual application, the welding part 44 is mainly used for welding with the end cover part 31 to fix the terminal 3 and the busbar 4. The welding part 44 is arranged on the outer periphery of the first lap joint part 41 and wrapped around the end cover part 31. On the one hand, this increases the distance between the welding position and the liquid injection hole 11 and avoids the residual electrolyte in the liquid injection hole 11 from seeping to the welding position. On the other hand, the welding part 44 is wrapped around the outer periphery of the end cover part 31, which increases the welding area between the welding part 44 and the end cover part 31 and improves the welding stability of the busbar 4 and the terminal 3.

[0049] Referring again to Figure 2 , the cover plate structure further comprises an insulating piece 5, which is arranged between the busbar 4 and the top cover 1 to separate the busbar 4 and the top cover 1. The insulating piece 5 can have a sealing effect. Since the top cover 1 is usually made of metal material, the contact between the busbar 4 and the top cover 1 can cause short circuit. Therefore, the insulating piece 5 can ensure that the busbar 4 does not directly contact the top cover 1 and avoid short circuit.

[0050] Referring again to Figure 2 and Figure 3The insulating piece 5 comprises a first insulating part 51, a second insulating part 52 and a third insulating part 53, the first and third insulating parts 51 and 53 are respectively connected to opposite sides of the second insulating part 52; the first insulating part 51 is arranged between the first lap joint part 41 and the outer side of the top cover 1, the second insulating part 52 is arranged between the connecting part 42 and the hole wall of the liquid injection hole 11, and the third insulating part 53 is arranged between the second lap joint part 43 and the inner side of the top cover 1.

[0051] In actual application, the first insulating part 51 is mainly used for spacing the first lap joint part 41 and the outer side of the top cover 1, the second insulating part 52 is mainly used for spacing the connecting part 42 and the hole wall of the liquid injection hole 11, and the third insulating part 53 is mainly used for spacing the second lap joint part 43 and the inner side of the top cover 1, so as to completely separate the bus bar plate 4 and the top cover 1 and avoid the contact between the bus bar plate 4 and the top cover 1.

[0052] Furthermore, along the axial direction Y of the liquid injection hole 11, the length of the first insulating part 51 is greater than the length of the third insulating part 53, that is, the thickness of the first insulating part 51 is greater than the thickness of the third insulating part 53. In this way, on the one hand, the first insulating part 51 is located on the outer side of the top cover 1, and when the battery is subjected to impact or external force impact, the thicker first insulating part 51 has stronger structural strength and can absorb the impact force, thereby avoiding damage to the top cover 1 and effectively preventing the welding temperature of the bus bar plate 4 and the terminal 3; on the other hand, the third insulating part 53 is located on the inner side of the top cover 1, that is, inside the battery, and is subjected to smaller impact force and mainly plays an insulating role, so the third insulating part 53 can be arranged to have a smaller thickness, thereby saving production materials and reducing production cost.

[0053] Meanwhile, along the radial direction X of the liquid injection hole 11, the length of the first insulating part 51 is greater than the length of the first lap joint part 41. Specifically, along the plane where the outer side of the top cover 1 is located, the projection area of the first insulating part 51 covers the projection area of the first lap joint part 41. In this way, the isolation effect of the first insulating part 51 is enhanced, and the contact between the first lap joint part 41 and the top cover 1 is effectively avoided. When the battery is subjected to external impact, the longer first insulating part 51 can play a good protection role and avoid the impact on the bus bar plate 4; and the welding temperature of the first lap joint part 41 and the terminal 3 is also insulated, thereby reducing the influence of the welding temperature on the inside of the battery.

[0054] Referring to Figure 5 The third insulating part 53 is attached to the inner side of the top cover 1 and extends to the side of the top cover 1. In this way, the third insulating part 53 can be used for insulation, thereby avoiding the direct contact between the top cover 1 and the inside of the battery and causing short circuit, and avoiding the contact between the internal conductive part of the battery and the top cover 1 when the battery is impacted, thereby preventing the abnormal flow of the current in the battery and ensuring the normal operation of the battery.

[0055] Again referring to Figure 5The outer side of the top cover 1 is provided with a positioning groove 12, and the first insulation part 51 is at least partially located in the positioning groove 12. The positioning groove 12 plays a key positioning role, so that the first insulation part 51 can be accurately placed at the corresponding position of the top cover 1, avoiding poor contact or short circuit caused by position deviation, reducing the adjustment and correction time in the assembly process, and improving the assembly efficiency in batch production. At the same time, the positioning groove 12 plays a certain limiting role on the first insulation part 51, effectively prevents the first insulation part 51 from deviating when the battery is impacted, and provides the connection stability of the insulation part 5 and the top cover 1.

[0056] Compared with the prior art, the application provides a cover plate structure and a battery. The cover plate structure comprises a top cover 1 and a terminal 3. The top cover 1 is provided with a liquid injection hole 11 penetrating through the opposite surfaces thereof. The terminal 3 comprises a cover part 31 and a blocking part 32. The cover part 31 is overlapped on the outer side of the top cover 1. The blocking part 32 is connected to one side of the cover part 31 close to the top cover 1. The blocking part 32 is at least partially inserted into the liquid injection hole 11 to block the liquid injection hole 11. The terminal 3 is used for electrically connecting with the battery cell assembly. Compared with the prior art, the application integrates the terminal 3 and the liquid injection hole 11 together. The liquid injection hole 11 does not need to be separately opened. The number of openings of the top cover 1 can be reduced, the manufacturing process can be reduced, and the production cost can be reduced. At the same time, the terminal 3 blocks the liquid injection hole 11, which plays a sealing role to a certain extent. The blocking part 32 can replace the sealing nail to seal, save the use of sealing materials, and help to seal the liquid injection hole 11. The battery using the cover plate structure improves the production efficiency of the battery parts, saves the battery production cost, and has good economic benefits.

[0057] The above is only a specific embodiment of the application. It should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the application. These improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A cover structure, characterized by include: The top cover has injection holes that penetrate its two opposing surfaces; The terminal includes an end cap and a sealing portion. The end cap overlaps the outer side of the top cover, and the sealing portion is connected to the side of the end cap near the top cover. The sealing portion extends at least partially into the injection hole to seal the injection hole. The terminal is used for electrical connection with the cell assembly. The cover plate structure includes a manifold, which includes a first overlapping portion, a connecting portion, and a second overlapping portion. The first overlapping portion and the second overlapping portion are respectively connected to opposite sides of the connecting portion. The first overlapping portion is located between the end cap and the top cap and extends away from the injection hole. The connecting portion is circumferentially attached to the wall of the injection hole. The second overlapping portion overlaps the inner side of the top cap. The manifold includes a welding portion, which is connected to the first overlapping portion and extends along the axial direction of the injection hole towards the end cap. The welding portion at least partially wraps around the outer periphery of the end cap.

2. The cover plate structure according to claim 1, wherein The cover plate structure includes a sealing element, which is disposed inside the injection hole and abuts against the injection hole to block the injection hole, and the blocking part abuts against the sealing element.

3. The cover plate structure according to claim 2, characterized by The injection hole has a first hole and a second hole along its axial direction; the first hole gradually narrows in the direction from the first hole to the second hole, the sealing part extends into the first hole and is adapted to the shape of the first hole, the second hole is adapted to the outer peripheral surface of the sealing element, and the sealing element extends at least partially from the second hole.

4. The cover plate structure according to claim 3, wherein The sealing part includes an abutting surface that is adapted to the outer peripheral surface of the sealing element and abuts against the sealing element.

5. The cover plate structure according to claim 1, wherein The cover structure includes an insulating element disposed between the manifold and the top cover to separate the manifold and the top cover.

6. The cover plate structure according to claim 5, wherein The insulating component includes a first insulating portion, a second insulating portion, and a third insulating portion. The first insulating portion and the third insulating portion are respectively connected to opposite sides of the second insulating portion. The first insulating portion is disposed between the first overlapping portion and the outer side of the top cover. The second insulating portion is disposed between the connecting portion and the wall of the injection hole. The third insulating portion is disposed between the second overlapping portion and the inner side of the top cover. Along the axial direction of the injection hole, the length of the first insulating portion is greater than the length of the third insulating portion. Along the radial direction of the injection hole, the length of the first insulating portion is greater than the length of the first overlapping portion.

7. The cover plate structure according to claim 6, wherein The outer side of the top cover is provided with a positioning groove, and the first insulating part is at least partially located in the positioning groove; the third insulating part is attached to the inner side of the top cover and extends to the side of the top cover.

8. A battery, characterized by The battery includes the cover structure as described in any one of claims 1 to 7, as well as the battery casing and the battery cell assembly, wherein the battery casing is connected to the cover structure, and the battery cell assembly is disposed inside the battery casing and electrically connected to the terminals.

Images