Cover plate structure and battery

Abstract

The invention discloses a cover plate structure and a battery, the cover plate structure comprises a top cover and a terminal, 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, and the terminal is used for being electrically connected 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 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] The embodiments of the present invention relate to the technical field of new energy batteries, and in particular to a cover plate structure and a battery. Background Art

[0002] With the continuous development of new energy, lithium batteries are more widely used in various industries. In related technologies, the terminal is a component of lithium batteries used to connect to external circuits. It is the lead-out end of the positive and negative electrodes of the battery and plays the role of conducting current. There is usually an injection hole on the top of the lithium battery. When the battery shell is assembled, the electrolyte is injected into the battery through the injection hole on the top. After the injection is completed, the injection hole will be sealed to prevent electrolyte leakage.

[0003] In the related art, the terminal and the injection hole are opened independently, so the corresponding parts of the lower plastic and the busbar in the top cover structure need to avoid the injection hole, which increases the manufacturing cost and makes the production design more difficult. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a cover plate structure and a battery, which can integrate terminals and injection holes to reduce production difficulty.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

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

[0007] As one embodiment, the cover plate structure includes a sealing member, which is disposed 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 member.

[0008] As one of the embodiments, the injection hole is formed with a first hole position and a second hole position along its axial direction; along the direction from the first hole position to the second hole position, the first hole position is in a gradually contracted state, the sealing portion extends into the first hole position and is adapted to the shape of the first hole position, the second hole position is adapted to the outer peripheral surface of the sealing member, and the sealing member at least partially extends from the second hole position.

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

[0010] As one embodiment, the cover plate structure includes a busbar, which includes a first overlapping portion, a connecting portion and a second overlapping portion, wherein the first overlapping portion and the second overlapping portion are respectively connected to opposite sides of the connecting portion, the first overlapping portion is arranged between the end cover portion and the top cover, and extends in a direction 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 surface of the top cover.

[0011] As one embodiment, the busbar includes a welding portion, which is connected to the first lap portion and extends along the axial direction of the injection hole in a direction close to the end cover portion, and the welding portion is at least partially wrapped around the outer peripheral side of the end cover portion.

[0012] As one embodiment, the cover plate structure includes an insulating member, and the insulating member is disposed between the busbar and the top cover to separate the busbar and the top cover.

[0013] As one embodiment, the insulating part includes a first insulating part, a second insulating part and a third insulating part, the first insulating part and the third insulating part are respectively connected to the opposite sides of the second insulating part; the first insulating part is arranged between the first overlapping part 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 injection hole, and the third insulating part is arranged between the second overlapping part and the inner side surface of the top cover; along the axial direction of the 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 injection hole, the length of the first insulating part is greater than the length of the first overlapping part.

[0014] As one embodiment, a positioning groove is formed on the outer side surface of the top cover, and the first insulating part is at least partially located 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 invention is to provide a battery, comprising the cover plate structure as well as a battery shell and a battery cell assembly in any of the above embodiments, wherein the battery shell is connected to the cover plate structure, and the battery cell assembly is disposed in the battery shell and electrically connected to the terminal.

[0016] The beneficial effects of the present invention are as follows: the embodiment of the present application provides a cover plate structure and a battery, the cover plate structure includes a top cover and a terminal, the top cover is provided with a liquid injection hole penetrating its two opposite surfaces; the terminal includes an end cover portion and a plugging portion, the end cover portion overlaps the outer side surface of the top cover, the plugging portion is connected to the side of the end cover portion close to the top cover, the plugging portion at least partially extends into the liquid injection hole to plug the liquid injection hole, and the terminal is used to be electrically connected to the battery cell assembly. Compared with the prior art, the present application integrates the terminal and the liquid injection hole together, and the liquid injection hole does not need to be opened separately, which can reduce the number of top cover openings, reduce manufacturing processes, and reduce production costs; at the same time, the terminal blocks the liquid injection hole, which plays a sealing role to a certain extent, and the plugging portion can replace the sealing nail for sealing, saving the use of sealing materials, and helping to seal the liquid injection hole. The battery using this cover plate structure improves the production efficiency of battery components, saves battery production costs, and has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural 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 The enlarged view of point A in the middle;

[0020] Figure 4 for Figure 2 The 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. sealing member; 3. terminal; 31. end 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 invention, the terms "disposed", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "radial", "circumferential", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] See also Figure 1 An embodiment of the present application provides a battery, including a cover structure, a battery shell (not shown in the figure) and a battery cell assembly (not shown in the figure), the cover structure is connected to the battery shell, specifically, the cover structure is connected to one side of the battery shell, the cover structure and the battery shell are surrounded to form an installation space, and the installation space is used to install the battery cell assembly to complete the assembly of the battery.

[0031] See also Figure 2The cover plate structure includes a top cover 1 and a terminal 3. The top cover 1 is provided with a liquid injection hole 11 penetrating through two opposite surfaces thereof; the terminal 3 includes an end cover portion 31 and a plugging portion 32. The end cover portion 31 is overlapped on the outer side surface of the top cover 1, and the plugging portion 32 is connected to a side of the end cover portion 31 close to the top cover 1. The plugging portion 32 at least partially extends into the liquid injection hole 11 to plug the liquid injection hole 11. The terminal 3 is electrically connected to the battery cell assembly.

[0032] In practical applications, the cover plate structure of the present application can be applied to round lithium batteries. After the battery is assembled, an injection hole 11 is opened on the top cover 1, and the electrolyte is injected through one end opening of the injection hole 11, and the electrolyte enters the battery from the other end opening of the injection hole 11. After the injection is completed, the sealing portion 32 of the terminal 3 is extended into the injection hole 11 to seal the injection hole 11 and prevent electrolyte leakage; at the same time, the end cover portion 31 of the terminal 3 can be connected to the top cover 1 to fix the terminal 3, and the terminal 3 is electrically connected to the internal battery cell assembly to conduct the current of the battery cell assembly to the external circuit. Compared with the prior art, the present application integrates the terminal 3 and the injection hole 11 together, and the injection hole 11 does not need to be opened separately, which can reduce the number of openings of the top cover 1, reduce the manufacturing process, and reduce the production cost; at the same time, the terminal 3 blocks the injection hole 11, which plays a sealing role to a certain extent, and the blocking part 32 can replace the sealing nail for sealing, saving the use of sealing materials, and helping to seal the injection hole 11. The battery using this cover plate structure improves the production efficiency of battery components, saves battery production costs, and has good economic benefits.

[0033] It should be noted that the terminal 3 of the round lithium battery is a component of the battery used to connect to an external circuit. It is the lead-out end of the positive and negative electrodes of the battery, and plays the role of conducting current, so that the battery can power external devices or receive charging from external charging devices.

[0034] A pressure relief valve may also be provided on the top cover 1. During the use of the lithium battery, the internal pressure of the battery may rise sharply due to various circumstances. For example, when overcharged, a series of complex electrochemical reactions will occur inside the battery, generating a large amount of gas, which will increase the pressure. When the internal pressure exceeds the limit that the battery shell can withstand, the battery is in danger of exploding. The presence of the pressure relief valve can automatically open when the pressure reaches a certain threshold to release the internal gas, thereby effectively avoiding battery explosion and ensuring the personal safety of users and equipment safety.

[0035] In one embodiment, the pressure relief valve can generally be arranged 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 bursting disc-type pressure relief valve or the like; the pressure relief valve and the top cover 1 can be connected by means of snap-fit ​​or the like.

[0036] See also Figure 3 The cover plate structure further includes a sealing member 2 , which is disposed in the liquid injection hole 11 and abuts against the liquid injection hole 11 to block the liquid injection hole 11 , and the blocking portion 32 abuts against the sealing member 2 .

[0037] In actual application, the injection hole 11 needs to be sealed after the injection is completed to prevent leakage of the electrolyte. Therefore, in order to further enhance the sealing of the injection hole 11, the cover plate structure is also provided with a seal 2, which is inserted into the injection hole 11, and the seal 2 is in contact with the injection hole 11 to achieve a sealing effect; and the seal 2 is plugged into the opening of the injection hole 11 close to the battery cell assembly to further prevent the electrolyte inside the battery from leaking out of the injection hole 11; at the same time, the plugging part 32 extends from the opening of the injection hole 11 close to the terminal side into the injection hole 11, which plays the role of sealing the injection hole 11. Through the double sealing of the seal 2 and the plugging part 32, the sealing effect of the injection hole 11 is effectively improved.

[0038] See again Figure 3 and Figure 4 For the sake of clarity, 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 is formed with a first hole position 111 and a second hole position 112 along its axial direction Y. In the direction from the first hole position 111 to the second hole position 112, the first hole position 111 is in a gradually contracted state, the blocking portion 32 extends into the first hole position 111 and matches the shape of the first hole position 111, the second hole position 112 matches the outer peripheral surface of the sealing member 2, and the sealing member 2 at least partially extends from the injection hole 11.

[0039] In practical applications, the electrolyte needs to be injected into the battery from the injection hole 11, and the first hole position 111 is in a gradually contracted state, that is, the first hole position 111 is set in a conical shape. During injection, the conical first hole position 111 has a certain drainage 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 bubbles or liquid accumulation caused by poor flow during the injection process, thereby improving the efficiency and quality of the injection. In addition, the blocking 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 blocking portion 32 fit better with the inner wall of the injection hole 11. When the blocking portion 32 is inserted into the conical first hole position 111, it will be squeezed by the hole wall, thereby forming a tighter seal.

[0040] The second hole 112 is matched with 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 with 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 close to the side of the battery core assembly, which can better prevent the electrolyte from seeping out of the injection hole 11, better maintain the sealing state, and prevent electrolyte leakage. The seal 2 extending from the injection hole 11 is convenient for operators to check the sealing state and more intuitively check the sealing effect, which helps to find sealing defects in time and improve product quality.

[0041] See again Figure 4 The blocking portion 32 includes a contact surface 321 , which is matched with the outer peripheral surface of the sealing member 2 and contacts the sealing member 2 .

[0042] In actual application, in order to further improve the sealing effect of the injection hole 11, the blocking portion 32 extends into the injection hole 11 and abuts against the sealing member 2 in the injection hole 11, so that no gap is generated between the blocking portion 32 and the sealing member 2, and the two form a tight seal, which effectively enhances the sealing effect. The side of the blocking portion 32 that contacts the sealing member 2 is set as an abutment surface 321, and the shape of the abutment surface 321 is adapted to the shape of the outer peripheral surface of the sealing member 2, so that the abutment surface 321 and the sealing member 2 form a tighter fit.

[0043] See again Figure 3 The cover plate structure also includes a busbar 4, which includes a first overlapping portion 41, a connecting portion 42 and a second overlapping portion 43. The first overlapping portion 41 and the second overlapping portion 43 are respectively connected to opposite sides of the connecting portion 42. The first overlapping portion 41 is arranged between the end cover portion 31 and the top cover 1, and extends in a direction away from the injection hole 11. The connecting portion 42 is circumferentially attached to the hole wall of the injection hole 11, and the second overlapping portion 43 is overlapped on the inner side of the top cover 1.

[0044] It should be noted that a battery usually has multiple pole ears, and the busbar 4 can connect these scattered pole ears and gather the current collected from each pole ear together. The busbar 4 provides a wider conductive plane, so that the current can be conducted more evenly and efficiently, thereby improving the charging and discharging efficiency of the battery.

[0045] Therefore, the present application provides a busbar 4, which is arranged between the terminal 3 and the top cover 1. On the one hand, it can be in contact with the terminal 3 and have a conductive function, and on the other hand, it can increase the distance between the connection between the busbar 4 and the terminal 3 and the injection hole 11. Specifically, the busbar 4 includes a first lap portion 41, a connecting portion 42 and a second lap portion 43. The first lap portion 41 is arranged between the end cover portion 31 and the top cover 1, and extends in a direction away from the injection hole 11. The first lap portion 41 is mainly used for welding with the terminal 3. Therefore, extending in a direction away from the injection hole 11 can increase the distance between the welding point and the injection hole 11, thereby avoiding the welding temperature affecting the inside of the battery when the busbar 4 is welded to the terminal 3, and also avoiding the electrolyte residual in the injection hole 11 from seeping into the welding position and affecting the welding quality. The second overlapping portion 43 is overlapped on the inner side surface of the top cover 1, and can mainly contact the internal battery cell. The connecting portion 42 is used to connect the first overlapping portion 41 and the second overlapping portion 43 to realize current conduction. At the same time, the connecting portion 42 is also penetrated into the injection hole 11, thereby increasing the contact area between the busbar 4 and the terminal 3 and improving the current conduction efficiency.

[0046] It can be understood that the terminal 3 and the busbar 4 are both made of metal material and have a conductive function.

[0047] See again Figure 3 The busbar 4 includes a welding portion 44 , which is connected to the first overlapping portion 41 and extends along the axial direction of the injection hole 11 toward the end cover portion 31 . The welding portion 44 is at least partially wrapped around the outer peripheral side of the end cover portion 31 .

[0048] In practical applications, the welding portion 44 is mainly used for welding with the end cover portion 31 to achieve the fixation of the terminal 3 and the busbar 4. The welding portion 44 is arranged on the outer peripheral side of the first lap portion 41 and wrapped around the end cover portion 31. On the one hand, the distance between the welding position and the injection hole 11 is increased to prevent the residual electrolyte in the injection hole 11 from seeping into the welding position. On the other hand, the welding portion 44 is wrapped around the outer periphery of the end cover portion 31, which increases the welding area between the welding portion 44 and the end cover portion 31 and improves the welding stability between the busbar 4 and the terminal 3.

[0049] See again Figure 2 The cover plate structure further includes an insulating member 5, which is disposed between the busbar 4 and the top cover 1 to separate the busbar 4 and the top cover 1. The insulating member 5 can play a sealing role, and since the top cover 1 is usually made of metal, the contact between the busbar 4 and the top cover 1 will cause a short circuit, so the insulating member 5 also ensures that the busbar 4 will not directly contact the top cover 1 to avoid a short circuit.

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

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

[0052] And 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, 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. When the battery is impacted or hit by external force, the thicker first insulating part 51 has a stronger structural strength, which can absorb the impact force and avoid damage to the top cover 1. At the same time, it can effectively isolate the welding temperature of the busbar 4 and the terminal 3; and the third insulating part 53 is located on the inner side of the top cover 1, that is, located inside the battery, and is subject to less impact force, and mainly plays an insulating role. Therefore, the third insulating part 53 can be set to a smaller thickness, saving production materials and saving production costs.

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

[0054] See also Figure 5 The third insulating portion 53 is fitted with the inner side of the top cover 1 and extends to the side of the top cover 1. In this way, the third insulating portion 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 when the battery collides, causing abnormal current flow inside the battery, thereby ensuring 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, so that the first insulating part 51 can be accurately placed in the corresponding position of the top cover 1, avoiding problems such as poor contact or short circuit caused by position deviation, reducing the adjustment and error correction time during the assembly process, and improving assembly efficiency during mass production. At the same time, the positioning groove 12 plays a certain limiting role on the first insulating part 51. When the battery is hit, it effectively prevents the first insulating part 51 from shifting, providing stability in the connection between the insulating member 5 and the top cover 1.

[0056] Different from the prior art, the embodiment of the present application provides a cover plate structure and a battery, the cover plate structure includes a top cover 1 and a terminal 3, the top cover 1 is provided with a liquid injection hole 11 penetrating through its two opposite surfaces; the terminal 3 includes an end cover portion 31 and a plugging portion 32, the end cover portion 31 overlaps the outer side surface of the top cover 1, the plugging portion 32 is connected to the side of the end cover portion 31 close to the top cover 1, the plugging portion 32 at least partially extends into the liquid injection hole 11 to plug the liquid injection hole 11, and the terminal 3 is used to be electrically connected to the battery cell assembly. Compared with the prior art, the present application integrates the terminal 3 and the liquid injection hole 11 together, and the liquid injection hole 11 does not need to be opened separately, which can reduce the number of openings of the top cover 1, reduce the manufacturing process, and reduce the production cost; at the same time, the terminal 3 blocks the liquid injection hole 11, which plays a sealing role to a certain extent, and the plugging portion 32 can replace the sealing nail for sealing, saving the use of sealing materials, and helping to seal the liquid injection hole 11. The battery using this cover plate structure improves the production efficiency of battery parts, saves battery production costs, and has good economic benefits.

[0057] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A cover plate structure, characterized in that: include: The top cover is provided with a liquid injection hole penetrating through two opposite surfaces thereof; The terminal comprises an end cover portion and a sealing portion, wherein the end cover portion overlaps the outer side surface of the top cover, the sealing portion is connected to a side of the end cover portion close to the top cover, and the sealing portion at least partially extends into the injection hole to seal the injection hole; the terminal is used to be electrically connected to the battery cell assembly.

2. The cover plate structure according to claim 1, characterized in that: The cover plate structure includes a sealing member, which is disposed 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 member.

3. The cover plate structure according to claim 2, characterized in that: The injection hole is formed with a first hole position and a second hole position along its axial direction; along the direction from the first hole position to the second hole position, the first hole position is in a gradually contracted state, the blocking portion extends into the first hole position and is adapted to the shape of the first hole position, the second hole position is adapted to the outer peripheral surface of the sealing member, and the sealing member at least partially extends from the second hole position.

4. The cover plate structure according to claim 3, characterized in that: The blocking portion includes a contact surface, which is matched with the outer peripheral surface of the sealing member and contacts the sealing member.

5. The cover plate structure according to any one of claims 1 to 4, characterized in that: The cover plate structure includes a busbar, which includes a first overlapping portion, a connecting portion and a second overlapping portion, wherein the first overlapping portion and the second overlapping portion are respectively connected to opposite sides of the connecting portion, the first overlapping portion is arranged between the end cover portion and the top cover, and extends in a direction 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 surface of the top cover.

6. The cover plate structure according to claim 5, characterized in that: The busbar includes a welding portion, which is connected to the first overlapping portion and extends along the axial direction of the injection hole in a direction close to the end cover portion, and the welding portion is at least partially wrapped around the outer peripheral side of the end cover portion.

7. The cover plate structure according to claim 5, characterized in that: The cover plate structure includes an insulating member, and the insulating member is arranged between the busbar and the top cover to separate the busbar and the top cover.

8. The cover plate structure according to claim 7, characterized in that: The insulating member includes a first insulating portion, a second insulating portion and a third insulating portion, wherein 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 arranged between the first overlapping portion and the outer side surface of the top cover, the second insulating portion is arranged between the connecting portion and the hole wall of the injection hole, and the third insulating portion is arranged between the second overlapping portion and the inner side surface 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, and 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 surface 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 in contact with the inner side surface of the top cover and extends to the side of the top cover.

10. A battery, characterized in that: It comprises the cover plate structure as claimed in any one of claims 1 to 9, a battery shell and a battery cell assembly, wherein the battery shell is connected to the cover plate structure, and the battery cell assembly is arranged in the battery shell and electrically connected to the terminal.

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