Cover plate structure and battery

Abstract

The utility model discloses a cover plate structure and a battery, the cover plate structure comprises a top cover, a terminal and a pressure release valve, and the top cover is provided with a liquid injection hole penetrating through two opposite surfaces of the top cover; the terminal comprises an end cover part and a plugging part, the end cover part is lapped on the outer side surface of the top cover, the plugging part is connected to one side, close to the top cover, of the end cover part, at least part of the plugging part extends into the liquid injection hole to plug the liquid injection hole, the terminal is used for being electrically connected with the battery cell assembly, and the pressure release valve is connected with the top cover. Compared with the prior art, the terminal and the liquid injection hole are integrated together, the liquid injection hole does not need to be opened independently, the number of openings of the top cover can be reduced, manufacturing procedures are reduced, and the production cost is reduced; and meanwhile, the terminal blocks the liquid injection hole, so that a sealing effect is achieved to a certain extent, and the liquid injection hole is favorably sealed. According to the battery adopting the cover plate structure, the production efficiency of battery parts is improved, the production cost of the battery is saved, and good economic benefits are achieved.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a cover plate structure and a battery. Background Technology

[0002] With the continuous development of new energy sources, lithium batteries are being used more widely in various industries. In lithium-ion battery technology, terminals are components used to connect to external circuits; they are the leads of the positive and negative electrodes and serve to conduct current. Lithium-ion batteries typically also have an electrolyte injection hole on the top. After the battery casing is assembled, electrolyte is injected into the battery through this hole. This injection hole is sealed after injection to prevent electrolyte leakage.

[0003] In related technologies, terminals and injection holes are opened independently. Therefore, the corresponding parts of the lower plastic and manifold in the top cover structure need to avoid the injection hole position, which increases manufacturing costs and makes production design more difficult. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a cover plate structure and battery that can integrate terminals and liquid injection holes, reducing the difficulty of production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A cover structure includes a top cover, terminals, and a pressure relief valve. The top cover has injection holes penetrating its two opposite surfaces. The terminals include an end cap portion and a sealing portion. The end cap portion overlaps the outer side of the top cover, and the sealing portion is connected to the side of the end cap portion near the top cover. The sealing portion extends at least partially into the injection holes to seal them. The terminals are used for electrical connection with a battery cell assembly. The pressure relief valve is connected to the top cover and is used to regulate the internal pressure of the battery cell assembly.

[0007] In one embodiment, 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.

[0008] In one embodiment, 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 seal, and the seal extends at least partially from the second hole.

[0009] In one embodiment, the sealing portion includes an abutting surface that is adapted to the outer peripheral surface of the sealing member and abuts against the sealing member.

[0010] In one embodiment, 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 disposed between the end cap and the top cap and extends away from the injection hole. The connecting portion is circumferentially attached to the hole wall of the injection hole, and the second overlapping portion overlaps the inner side of the top cap.

[0011] In one embodiment, the manifold includes a welded portion connected to the first overlapping portion and extending toward the end cap portion along the axial direction of the injection hole. The welded portion at least partially wraps around the outer periphery of the end cap portion.

[0012] In one embodiment, the cover structure includes an insulating member disposed between the manifold and the top cover to space the manifold and the top cover.

[0013] In one embodiment, the insulating member 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.

[0014] In one embodiment, a positioning groove is provided on the outer side of the top cover, 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.

[0015] Another objective of this utility model is to provide a battery, including the cover plate structure in any of the above embodiments, as well as a battery casing and a cell assembly, wherein the battery casing is connected to the cover plate structure, and the cell assembly is disposed inside the battery casing and electrically connected to the terminals.

[0016] The beneficial effects of this utility model are as follows: This application provides a cover plate structure and a battery. The cover plate structure includes a top cover, terminals, and a pressure relief valve. The top cover has an injection hole penetrating its two opposing surfaces. The terminals include an end cap portion and a sealing portion. The end cap portion overlaps the outer side of the top cover, and the sealing portion is connected to the side of the end cap portion near the top cover. The sealing portion extends at least partially into the injection hole to seal it. The terminals are used for electrical connection with the cell assembly. The pressure relief valve is connected to the top cover. Compared with the prior art, this application integrates the terminals and injection holes together, eliminating the need for separate openings for the injection holes. This reduces the number of openings in the top cover, reduces manufacturing processes, and lowers production costs. Simultaneously, the terminals sealing the injection holes provide a certain degree of sealing. The sealing portion can replace sealing pins for sealing, saving on sealing material and facilitating the sealing of the injection holes. Batteries using this cover plate structure improve the production efficiency of battery components, save battery production costs, and have good economic benefits. Attached Figure Description

[0017] Figure 1 A schematic diagram of a cover plate structure according to an embodiment of the present invention is shown;

[0018] Figure 2 A cross-sectional schematic diagram of a cover plate structure according to an embodiment of the present invention is shown;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0021] Figure 5 A cross-sectional schematic diagram of a top cover according to an embodiment of the present invention is shown;

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

[0023] 2. Seal; 3. Terminal; 31. End cap; 32. Sealing part; 321. Abutment surface;

[0024] 4. Busbar; 41. First overlapping part; 42. Connecting part; 43. Second overlapping part; 44. Welding part; 5. Insulating component; 51. First insulating part; 52. Second insulating part; 53. Third insulating part. Detailed Implementation

[0025] In this utility model, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or constituent parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] See Figure 1 This application provides a battery including a cover structure, a battery casing (not shown in the figure), and a cell assembly (not shown in the figure). The cover structure is connected to the battery casing. Specifically, the cover structure is connected to one side of the battery casing. The cover structure and the battery casing enclose an installation space for installing the cell assembly to complete the battery assembly.

[0031] See Figure 2The aforementioned cover structure includes a top cover 1, a terminal 3, and a pressure relief valve (not shown in the figure). The top cover 1 has an injection hole 11 that penetrates its two opposing surfaces. The terminal 3 includes an end cap 31 and a sealing part 32. The end cap 31 overlaps the outer side of the top cover 1, and the sealing part 32 is connected to the side of the end cap 31 near the top cover 1. The sealing part 32 extends at least partially into the injection hole 11 to seal the injection hole 11. The terminal 3 is electrically connected to the battery cell assembly. The pressure relief valve is connected to the top cover and is used to regulate the pressure inside the battery cell assembly.

[0032] In practical applications, the cover structure of this application can be applied to a circular lithium battery. After the battery is assembled, an injection hole 11 is provided on the top cover 1. Electrolyte is injected through one end opening of the injection hole 11, and the electrolyte enters the battery through the other end opening of the injection hole 11. After the injection is completed, the sealing part 32 of the terminal 3 is inserted into the injection hole 11 to seal the injection hole 11 and prevent electrolyte leakage. At the same time, the end cap part 31 of the terminal 3 can be connected to the top cover 1 to fix the terminal 3. The terminal 3 is electrically connected to the internal cell assembly to conduct the current of the cell assembly to the external circuit. Compared to existing technologies, this application integrates the terminal 3 and the injection hole 11 together, eliminating the need for a separate opening for the injection hole 11. This reduces the number of openings in the top cover 1, decreases manufacturing steps, and lowers production costs. Simultaneously, the terminal 3 seals the injection hole 11, providing a degree of sealing. The sealing part 32 can replace the sealing pin, saving on sealing material and facilitating the sealing of the injection hole 11. Batteries employing this cover structure improve the production efficiency of battery components, reduce battery production costs, and offer significant economic benefits.

[0033] It should be noted that terminal 3 of the cylindrical lithium battery is the component used to connect the battery to an external circuit. It is the lead-out terminal of the battery's positive and negative terminals, serving to conduct current, enabling the battery to power external devices or receive charging from external charging devices.

[0034] The top cover 1 is also equipped with a pressure relief valve. During the use of lithium batteries, various situations may cause a rapid increase in internal pressure. For example, during overcharging, a series of complex electrochemical reactions occur inside the battery, producing a large amount of gas and increasing the pressure. When the internal pressure exceeds the limit that the battery casing can withstand, the battery is at risk of explosion. The pressure relief valve automatically opens when the pressure reaches a certain threshold, releasing the internal gas and effectively preventing battery explosion, thus ensuring the safety of the user and the equipment.

[0035] In one embodiment, the pressure relief valve can typically be located in the center of the top cover 1, so that when the internal pressure of the battery increases, the gas can diffuse relatively evenly in all directions and be discharged through the pressure relief valve; the pressure relief valve can adopt a reed-type pressure relief valve, a rupture disc-type pressure relief valve, or other structures; the pressure relief valve and the top cover 1 can be connected by snap-fit ​​or other means.

[0036] See Figure 3 The cover plate structure also includes a sealing element 2, which is disposed inside the injection hole 11 and abuts against the injection hole 11 to block the injection hole 11. The sealing part 32 abuts against the sealing element 2.

[0037] In practical applications, the injection hole 11 needs to be sealed after injection to prevent electrolyte leakage. Therefore, to further enhance the sealing performance of the injection hole 11, the cover structure is also equipped with a sealing element 2. The sealing element 2 is inserted into the injection hole 11 and abuts against the injection hole 11 to achieve a sealing effect. Furthermore, the sealing element 2 plugs the opening of the injection hole 11 near the cell assembly side to further prevent electrolyte from seeping out of the injection hole 11. At the same time, the sealing part 32 extends into the injection hole 11 from the opening near the terminal side, thus sealing the injection hole 11. Through the double sealing of the sealing element 2 and the sealing part 32, the sealing effect of the injection hole 11 is effectively improved.

[0038] See again Figure 3 and Figure 4 To describe clearly, Figure 3 The X direction refers to the radial direction of the injection hole 11, and the Y direction refers to the axial direction of the injection hole 11. The injection hole 11 has a first hole position 111 and a second hole position 112 formed along its axial direction Y. Along the direction from the first hole position 111 to the second hole position 112, the first hole position 111 is in a gradually narrowing state. The sealing part 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 peripheral surface of the sealing member 2. The sealing member 2 extends at least partially from the injection hole 11.

[0039] In practical applications, the electrolyte needs to be injected into the battery through the injection hole 11. The first hole 111 gradually narrows, meaning it is cone-shaped. During injection, the cone-shaped first hole 111 has a certain flow-guiding effect, guiding the electrolyte to flow more smoothly into the battery. The electrolyte can flow along the inclined surface of the cone-shaped hole, reducing air bubbles or liquid accumulation caused by poor flow during injection, thereby improving the efficiency and quality of injection. Furthermore, the sealing part 32 is adapted to the shape of the first hole 111. The cone-shaped design of the first hole 111 allows the sealing part 32 to fit better against the inner wall of the injection hole 11. When the sealing part 32 is inserted into the cone-shaped first hole 111, it is squeezed by the hole wall, thus forming a tighter seal.

[0040] The second hole 112 is adapted to the outer peripheral surface of the seal 2. For example, when the seal 2 is a sealing ball, the second hole 112 is also spherical. In this way, when the seal 2 is inserted into the second hole 112, the seal 2 can fit tightly against the hole wall of the second hole 112 to achieve a sealing effect. At the same time, the seal 2 can extend from the opening of the injection hole 11 near the cell assembly side, which can better prevent electrolyte from seeping out of the injection hole 11, better maintain the sealing state, prevent electrolyte leakage, and the seal 2 extending out of the injection hole 11 makes it convenient for operators to check the sealing status, more intuitively check the sealing effect, help to detect sealing defects in time, and improve product quality.

[0041] See again Figure 4 The sealing part 32 includes an abutment surface 321, which is adapted to the outer peripheral surface of the sealing member 2 and abuts against the sealing member 2.

[0042] In practical applications, to further improve the sealing effect of the injection hole 11, the plugging part 32 extends into the injection hole 11 and abuts against the sealing element 2 inside the injection hole 11. This prevents gaps between the plugging part 32 and the sealing element 2, forming a tight seal and effectively enhancing the sealing effect. The side of the plugging part 32 that contacts the sealing element 2 is designated as the abutment surface 321. The shape of the abutment surface 321 matches the shape of the outer circumferential surface of the sealing element 2, thereby allowing the abutment surface 321 to form a tighter fit with the sealing element 2.

[0043] See again Figure 3 The cover structure also includes a manifold 4, which includes a first overlapping part 41, a connecting part 42, and a second overlapping part 43. The first overlapping part 41 and the second overlapping part 43 are respectively connected to the opposite sides of the connecting part 42. The first overlapping part 41 is located between the end cap part 31 and the top cap 1 and extends away from the injection hole 11. The connecting part 42 is circumferentially attached to the hole wall of the injection hole 11. The second overlapping part 43 overlaps the inner side of the top cap 1.

[0044] It should be noted that batteries typically have multiple tabs. The busbar 4 connects these scattered tabs and gathers the current collected from each tab together. The busbar 4 provides a wider conductive plane, which allows the current to be conducted more evenly and efficiently, thereby improving the charging and discharging efficiency of the battery.

[0045] Therefore, this application provides a busbar 4, which is located between the terminal 3 and the top cover 1. On the one hand, it can contact the terminal 3 and have a conductive function; on the other hand, it can increase the distance between the connection point of the busbar 4 and the terminal 3 and the injection hole 11. Specifically, the busbar 4 includes a first overlapping part 41, a connecting part 42, and a second overlapping part 43. The first overlapping part 41 is located between the end cover part 31 and the top cover 1 and extends away from the injection hole 11. The first overlapping part 41 is mainly used for welding with the terminal 3. Therefore, extending away from the injection hole 11 can increase the distance between the welding point and the injection hole 11, avoiding the welding temperature from affecting the inside of the battery when the busbar 4 is welded to the terminal 3, and also preventing residual electrolyte in the injection hole 11 from seeping into the welding position and affecting the welding quality. The second overlapping part 43 overlaps the inner side of the top cover 1 and can mainly contact the internal battery cell. The connecting part 42 is used to connect the first overlapping part 41 and the second overlapping part 43 to realize the conduction of current. At the same time, the connecting part 42 is also inserted 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 is understandable that both terminal 3 and busbar 4 are made of metal and have electrical conductivity.

[0047] See again Figure 3 The manifold 4 includes a welding part 44, which is connected to the first overlapping part 41 and extends along the axial direction of the injection hole 11 toward the end cap part 31. The welding part 44 at least partially wraps around the outer periphery of the end cap part 31.

[0048] In practical applications, the welding part 44 is mainly used to weld with the end cap part 31 to fix the terminal 3 and the manifold 4. The welding part 44 is located on the outer periphery of the first overlapping part 41 and is wrapped around the end cap part 31. On the one hand, it increases the distance between the welding position and the injection hole 11, preventing the electrolyte remaining in the injection hole 11 from seeping into the welding point. On the other hand, the welding part 44 is wrapped around the outer periphery of the end cap part 31, increasing the welding area between the welding part 44 and the end cap part 31, and improving the welding stability between the manifold 4 and the terminal 3.

[0049] See again Figure 2 The cover structure also includes an insulating component 5, which is located between the busbar 4 and the top cover 1 to separate the busbar 4 and the top cover 1. The insulating component 5 can play a sealing role, and since the top cover 1 is usually made of metal, contact between the busbar 4 and the top cover 1 will cause a short circuit. Therefore, the insulating component 5 also ensures that the busbar 4 does not directly contact the top cover 1, thus avoiding a short circuit.

[0050] See again Figure 2 and Figure 3The insulating component 5 includes a first insulating part 51, a second insulating part 52, and a third insulating part 53. The first insulating part 51 and the third insulating part 53 are respectively connected to the opposite sides of the second insulating part 52. The first insulating part 51 is disposed between the first overlapping part 41 and the outer side of the top cover 1, the second insulating part 52 is disposed between the connecting part 42 and the hole wall of the injection hole 11, and the third insulating part 53 is disposed between the second overlapping part 43 and the inner side of the top cover 1.

[0051] In practical applications, the first insulating part 51 is mainly used to separate the outer side of the first overlapping part 41 and the top cover 1, the second insulating part 52 is mainly used to separate the hole wall of the connecting part 42 and the injection hole 11, and the third insulating part 53 is mainly used to separate the inner side of the second overlapping part 43 and the top cover 1, so as to completely separate the manifold 4 and the top cover 1 and avoid contact between the manifold 4 and the top cover 1.

[0052] Furthermore, along the axial direction Y of the injection hole 11, the length of the first insulating part 51 is greater than the length of the third insulating part 53. That is to say, the thickness of the first insulating part 51 is greater than the thickness of the third insulating part 53. With this arrangement, on the one hand, the first insulating part 51 is located on the outer side of the top cover 1. When the battery is impacted or struck by external force, the thicker first insulating part 51 has stronger structural strength and can absorb the impact force to prevent damage to the top cover 1. At the same time, it can effectively isolate the welding temperature between the busbar 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. It is subjected to less impact force and mainly plays the role of insulation. Therefore, the third insulating part 53 can be set to a smaller thickness, saving production materials and reducing production costs.

[0053] Meanwhile, along the radial direction X of the injection hole 11, the length of the first insulating part 51 is greater than the length of the first overlapping part 41. Specifically, along the plane where the outer side of the top cover 1 is located, the projected area of ​​the first insulating part 51 covers the projected area of ​​the first overlapping part 41. This arrangement enhances the isolation effect of the first insulating part 51, effectively preventing the first overlapping part 41 from contacting the top cover 1. When the battery is subjected to external impact, the longer first insulating part 51 can play a good protective role, preventing the busbar 4 from being impacted; and it also isolates the welding temperature between the first overlapping part 41 and the end cover part 31, reducing the impact of welding temperature on the battery interior.

[0054] See 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. With this configuration, the third insulating part 53 can be used for insulation to prevent the top cover 1 from directly contacting the inside of the battery and causing a short circuit. At the same time, it can prevent the internal conductive parts of the battery from contacting the top cover 1 during a collision, which would cause abnormal current flow inside the battery and ensure the normal operation of the battery.

[0055] See again Figure 5The outer side of the top cover 1 is provided with a positioning groove 12, and the first insulating part 51 is at least partially located in the positioning groove 12. The positioning groove 12 plays a key positioning role, enabling the first insulating part 51 to be accurately placed in the corresponding position of the top cover 1, avoiding problems such as poor contact or short circuits caused by positional deviation, reducing the adjustment and error correction time during assembly, and improving assembly efficiency in mass production. At the same time, the positioning groove 12 also has a certain limiting effect on the first insulating part 51. When the battery is impacted, it effectively prevents the first insulating part 51 from shifting, providing stability to the connection between the insulating part 5 and the top cover 1.

[0056] Unlike existing technologies, this application provides a cover structure and a battery. The cover structure includes a top cover 1, terminals 3, and a pressure relief valve. The top cover 1 has an injection hole 11 penetrating its two opposing surfaces. The terminal 3 includes an end cap portion 31 and a sealing portion 32. The end cap portion 31 overlaps the outer side of the top cover 1, and the sealing portion 32 is connected to the side of the end cap portion 31 near the top cover 1. The sealing portion 32 extends at least partially into the injection hole 11 to seal it. The terminal 3 is used for electrical connection with the battery cell assembly. The pressure relief valve is connected to the top cover 1. Compared to existing technologies, this application integrates the terminal 3 and the injection hole 11 together, eliminating the need for a separate opening for the injection hole 11. This reduces the number of openings in the top cover 1, reduces manufacturing processes, and lowers production costs. Simultaneously, the terminal 3 sealing the injection hole 11 provides a sealing effect to a certain extent. The sealing portion 32 can replace sealing pins for sealing, saving on sealing material and facilitating the sealing of the injection hole 11. Batteries using this cover structure improve the production efficiency of battery components, save battery production costs, and have good economic benefits.

[0057] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A cover plate structure, characterized in that, 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. A pressure relief valve is connected to the top cover and is used to regulate the internal pressure of the battery cell assembly.

2. The cover plate structure according to claim 1, characterized in that, 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 in that, 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, characterized in that, 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 any one of claims 1 to 4, characterized in that, 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 hole wall of the injection hole, and the second overlapping portion overlaps the inner side of the top cap.

6. The cover plate structure according to claim 5, characterized in that, The manifold includes a welded portion connected to the first overlapping portion and extending along the axial direction of the injection hole toward the end cap portion. The welded portion at least partially wraps around the outer periphery of the end cap portion.

7. The cover plate structure according to claim 5, characterized in that, The cover structure includes an insulating element disposed between the manifold and the top cover to separate the manifold and the top cover.

8. The cover plate structure according to claim 7, characterized in that, 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.

9. The cover plate structure according to claim 8, characterized in that, 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.

10. A battery, characterized in that, The battery includes the cover structure as described in any one of claims 1 to 9, 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.

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