Cover assembly and battery

Abstract

The present invention provides a cover plate assembly and a battery, which relates to the technical field of lithium batteries, so as to optimize the structure of the cover plate assembly to a certain extent, improve the injection rate, and avoid the problem that the tape attached to the pole group connecting piece and the pole ear blocks the injection port during the vacuuming process, causing the production line alarm. The cover plate assembly provided by the present invention includes a first plastic part and a cover plate body; the cover plate body is formed with a convex portion, and a first injection port that penetrates the cover plate body is formed in the convex portion, and a groove is formed at the position of the first plastic part corresponding to the convex portion, and a first assembly gap is formed between the edge of the convex portion and the side wall of the groove; a second injection port is formed in the groove at a position corresponding to the first injection port, and a guide groove is formed on the side of the first plastic part away from the cover plate body and along the first direction of the first plastic part, the guide groove is connected with the second injection port, and at least part of the guide groove exceeds the coverage area of ​​the tape attached to the pole ear and the connecting piece in the pole group of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a cover plate assembly and a battery. Background Art

[0002] At present, the most commonly used channel structure for the injection port of the first plastic part of the top cover adopts a hole-opening structure at the bottom of a circular boss. For traditional pole groups, the connecting piece and the pole ear are located below the injection hole. In order to avoid welding marks between the connecting piece and the pole ear and overlapping short circuits between the pole ear and the shell, high-temperature resistant tape is affixed to the connecting piece and the pole ear. Since the position of the high-temperature resistant tape corresponds to the injection hole, when the electrolyte is injected through the injection hole and the pole group is vacuumed, the tape will cause a certain degree of blockage at the injection port, thereby causing an alarm on the production line. At the same time, because there is tape blocking the bottom during injection, the injection rate will slow down, affecting production efficiency, and the electrolyte will also bubble out, causing pollution problems.

[0003] Therefore, there is an urgent need to provide a cover plate assembly and a battery to solve the problems existing in the prior art to a certain extent. Summary of the invention

[0004] The object of the present invention is to provide a cover plate assembly and a battery, so as to solve the problem of optimizing the structure of the cover plate assembly to a certain extent, improving the injection rate, and avoiding the problem that the tape attached to the electrode group connecting piece and the electrode ear is blocked by the injection port during the vacuum pumping process, causing the production line alarm.

[0005] A cover plate assembly provided by the present invention comprises a first plastic part and a cover plate body; the cover plate body is formed with a convex portion, a first liquid injection port penetrating the cover plate body is formed in the convex portion, a groove is formed at a position of the first plastic part corresponding to the convex portion, a first assembly gap is formed between an edge of the convex portion and a side wall of the groove; a second liquid injection port is formed in the groove at a position corresponding to the first liquid injection port, a guide groove is formed on a side of the first plastic part away from the cover plate body and along a first direction of the first plastic part, the guide groove is connected with the second liquid injection port, and at least a part of the guide groove exceeds the coverage area of ​​the tape attached to the pole ear and the connecting sheet in the pole group of the battery;

[0006] The first direction is the length direction of the first plastic part.

[0007] The projection of the guide groove on the tape exceeds the tape, and the dimension exceeding the tape is x, where x≥0.3 mm.

[0008] Specifically, there are at least two guide grooves, which are arranged in parallel and communicated with the second liquid injection port.

[0009] Furthermore, in the cover plate assembly provided by the present invention, the diameter of the first liquid injection port is D, and D satisfies 2mm≤D≤5mm.

[0010] Furthermore, the diameter of the second liquid injection port is E, and E satisfies D+0.5mm≤E≤D+5mm.

[0011] The first assembly gap has a size of b, b≥0.3 mm, and a second assembly gap is formed between the end of the convex portion and the bottom of the groove, and the second assembly gap is g, g≥0.1 mm.

[0012] Specifically, the depth of the guide groove is a, and a≥0.2 mm.

[0013] Furthermore, the thickness of the first plastic part at a position corresponding to the guide groove is d, d≥0.3mm, and the thickness of the first plastic part at a position corresponding to the second liquid injection port is h, h=a+d, and h≥0.6mm.

[0014] Furthermore, the area of ​​the first injection port is S, S=π(D / 2) 2 ; The widths of the two guide grooves are C1 and C2 respectively, and C1≥0.3mm, C2≥0.3mm, and at the same time, (C1+C2)×a≥S must be satisfied.

[0015] Compared with the prior art, the cover plate assembly provided by the present invention has the following advantages:

[0016] The cover plate assembly provided by the present invention comprises a first plastic part and a cover plate body; the cover plate body is formed with a convex portion, a first liquid injection port penetrating the cover plate body is formed in the convex portion, a groove is formed in the first plastic part at a position corresponding to the convex portion, a first assembly gap is formed between the edge of the convex portion and the side wall of the groove; a second liquid injection port is formed in the groove at a position corresponding to the first liquid injection port, the first plastic part is away from the side of the cover plate body, and a guide groove is formed along the first direction of the first plastic part, the guide groove is connected with the second liquid injection port, and at least part of the guide groove exceeds the coverage area of ​​the tape attached to the pole ear and the connecting sheet in the pole group of the battery.

[0017] From this analysis, it can be seen that the initial positioning and alignment between the cover body and the first plastic part can be achieved through the convex part formed by the cover body and the groove formed at the position corresponding to the convex part of the first plastic part. Since the first liquid injection port in the present application is formed on the convex part and is arranged through the convex part, and the second liquid injection port is formed in the groove and is arranged corresponding to the first liquid injection port, therefore, when the convex part and the groove are aligned, the first liquid injection port and the second liquid injection port can be accurately aligned to achieve smooth and accurate injection of the electrolyte.

[0018] The first assembly gap formed between the side wall of the convex portion and the side wall of the concave groove can avoid interference between the two when they are assembled to a certain extent.

[0019] It is understandable that, since the position of the first plastic part corresponding to the second liquid injection port in the present application is formed with a guide groove extending along the first direction of the first plastic part and connected to the second liquid injection port, when the tape blocks the second liquid injection port, the electrolyte can be diffused in the guide groove by using the guide groove structure. And since at least part of the guide groove in the present application exceeds the coverage area of ​​the tape, the flow of electrolyte can be achieved through the part of the guide groove that exceeds the tape, thereby avoiding the electrolyte from entering the shell when the tape blocks the second liquid injection port, and at the same time, it can also avoid the problem of gas being unable to be extracted during vacuuming, thereby ensuring the smooth progress of structural operations.

[0020] In addition, the present invention also provides a battery, comprising a shell, a pole group and the above-mentioned cover plate assembly; the cover plate assembly is sealed on the opening of the shell to form a receiving space, and the pole group is arranged in the receiving space.

[0021] The battery using the cover assembly provided in the present application can have a faster liquid injection efficiency and a more stable vacuum pumping process, avoiding the problem of being unable to inject liquid or production line alarms due to the blocking of the liquid injection port by tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of a first plastic part from a first viewing angle in a cover plate assembly provided by an embodiment of the present invention;

[0024] Figure 2 A structural schematic diagram of a first plastic part in a cover plate assembly provided by an embodiment of the present invention from a second viewing angle;

[0025] Figure 3 A schematic structural diagram of a first plastic part in a cover plate assembly provided by an embodiment of the present invention from a third viewing angle;

[0026] Figure 4 A partial cross-sectional view of a cover plate assembly provided in an embodiment of the present invention;

[0027] Figure 5 for Figure 4 A local enlarged view of the cover plate assembly corresponding to the first assembly gap.

[0028] In the figure: 1-first plastic part; 101-second liquid injection port; 102-guiding groove; 1021-convex rib; 103-groove; 2-cover plate body; 201-convex part; 2011-first liquid injection port; 202-first assembly gap; 203-second assembly gap; 3-housing; 4-pole group; 401-pole ear; 402-connecting piece; 5-tape;

[0029] S1 - first direction. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0031] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0035] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0036] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0037] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0038] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

[0039] like Figure 1 Combination Figure 2As shown, the present invention provides a cover plate assembly, including a first plastic part 1 and a cover plate body 2; the cover plate body 2 is formed with a convex portion 201, and a first liquid injection port 2011 penetrating the cover plate body 2 is formed in the convex portion 201; a groove 103 is formed at a position of the first plastic part 1 corresponding to the convex portion 201, and a first assembly gap 202 is formed between the edge of the convex portion 201 and the side wall of the groove 103; a second liquid injection port 101 is formed at a position corresponding to the first liquid injection port 2011 in the groove 103, the first plastic part 1 is away from the side of the cover plate body 2, and a guide groove 102 is formed along a first direction S1 of the first plastic part 1, the guide groove 102 is connected to the second liquid injection port 101, and at least a portion of the guide groove 102 along the first direction S1 exceeds the coverage area of ​​the tape 5 attached to the pole ear 401 and the connecting sheet 402 in the pole group 4 of the battery; as shown Figure 1 As shown, the first direction S1 is the length direction of the first plastic part 1 .

[0040] Compared with the prior art, the cover plate assembly provided by the present invention has the following advantages:

[0041] The cover assembly provided by the present invention can achieve preliminary positioning and alignment between the cover body 2 and the first plastic part 1 through the convex portion 201 formed on the cover body 2 and the groove 103 formed at the position of the first plastic part 1 corresponding to the convex portion 201. Since the first liquid injection port 2011 in the present application is formed on the convex portion 201 and is arranged through the convex portion 201, and the second liquid injection port is formed in the groove 103 and is arranged corresponding to the first liquid injection port 2011, therefore, when the convex portion 201 is aligned with the groove 103, the first liquid injection port 2011 and the second liquid injection port 101 can be accurately aligned to achieve smooth and accurate injection of electrolyte.

[0042] The first assembly gap 202 formed between the side wall of the convex portion 201 and the side wall of the concave groove 103 can avoid interference between the two during assembly to a certain extent.

[0043] It is understandable that, since the first plastic part 1 in the present application is provided with a guide groove 102 extending along the first direction S1 of the first plastic part 1 and communicating with the second liquid injection port 101, when the tape 5 blocks the second liquid injection port 101, the electrolyte can be diffused in the guide groove 102 by utilizing the guide groove 102 structure. Since at least part of the guide groove 102 in the present application exceeds the coverage area of ​​the tape 5, the flow of the electrolyte can be achieved through the partial area where the guide groove 102 exceeds the tape 5, thereby preventing the electrolyte from entering the housing 3 when the tape 5 blocks the second liquid injection port 101, and at the same time, it can also avoid the problem that the gas cannot be extracted during the vacuum process, thereby ensuring the smooth progress of the structural operation.

[0044] Alternatively, if Figure 1 Combination Figure 2 and Figure 4 As shown, there are at least two guide grooves 102 in the present application, and the two guide grooves 102 are parallel and spaced apart on both sides of the second liquid injection port 101 .

[0045] By setting two guide grooves 102 at intervals on both sides of the second liquid injection port 101, the guide area can be increased to a certain extent, thereby improving the liquid flow capacity of the first plastic part 1. The guide grooves 102 set on both sides of the second liquid injection port 101 in the present application refer to the two sides of the diameter of the second liquid injection port 101 in the first direction S1 of the first plastic part 1. The areas of the second liquid injection port 101 connected by the two guide grooves 102 are the same, and since the two guide grooves 102 are set at intervals in the present application, a convex rib 1021 can be formed between the two guide grooves 102. It can be understood that since the two guide grooves 102 are formed in the area of ​​the second liquid injection port 101 in the present application, and the guide grooves 102 cut off part of the thickness of the first plastic part 1, that is, the thickness of the first plastic part 1 in the area where the guide grooves 102 are formed is less than the thickness of the entire first plastic part 1. Therefore, the present application arranges the guide grooves 102 at intervals to form the convex rib 1021, which can strengthen the structural strength of the first plastic part 1 in the area of ​​the guide grooves 102 to a certain extent and improve the stability of the overall structure.

[0046] It should be noted here that forming two guide grooves 102 in the present application is a more preferred solution. Of course, the number of guide grooves 102 can also be designed according to needs. The number of guide grooves 102 can be increased in two ways. One of them is to increase the number of guide grooves 102 in the coverage area of ​​the second liquid injection port 101, that is, to further divide the above-mentioned two guide grooves 102 into guide grooves 102 with smaller widths. The more guide grooves 102 there are, the more ribs 1021 are formed, and the greater the structural strength. However, since the width of the guide grooves 102 is reduced, the diversion capacity will be reduced accordingly.

[0047] Another way is to further set a new guide groove 102 on the side of the original two guide grooves 102 away from the second liquid injection port 101, and the new guide groove 102 can be connected to the original guide groove 102 through a connecting channel to further improve the guide capacity.

[0048] Alternatively, if Figure 4 As shown, in the cover plate assembly provided by the present invention, the diameter of the first liquid injection port 2011 is D, and D satisfies 2mm≤D≤5mm.

[0049] Preferably, the diameter of the first liquid injection port 2011 in the present application is 3 mm, so that the electrolyte can pass through better.

[0050] Further preferably, the diameter of the second liquid injection port 101 in the present application is E, and E satisfies D+0.5mm≤E≤D+5mm.

[0051] Alternatively, if Figure 4 and Figure 5 As shown, the size of the first assembly gap 202 in the present application is b, b≥0.3 mm, and a second assembly gap 203 is formed between the end of the convex portion 201 and the bottom of the groove 103, and the second assembly gap 203 is g, g≥0.1 mm.

[0052] The first assembly gap 202 in the present application refers to the gap formed between the position where the side wall and the edge of the groove 103 formed by the first plastic part 1 are connected and the side wall of the convex portion 201 of the cover plate body 2, so that the convex portion 201 and the side wall edge of the groove 103 form the first assembly gap 202, which can avoid the problem of mutual interference during the assembly process to a certain extent.

[0053] By forming a second assembly gap 203 between the bottom of the groove 103 and the end of the convex portion 201, the end of the convex portion 201 can be further prevented from abutting against the bottom, so that the gas can flow in the gap to ensure the injection efficiency.

[0054] Preferably, the depth of the guide groove 102 in the present application is a, and a≥0.2 mm.

[0055] Further preferably, the thickness of the first plastic part 1 in the present application at the position corresponding to the guide groove 102 is d, d≥0.3mm, and the thickness of the first plastic part 1 at the position corresponding to the second injection port 101 is h, h=a+d, and h≥0.6mm.

[0056] It can be understood that since the second liquid injection port 101 is a perforated structure, the thickness of the first plastic part 1 corresponding to the position of the second liquid injection port 101 in the present application is h, which means that the wall thickness corresponding to the second liquid injection port 101 is h. By making h ≥ 0.6 mm, it can be avoided to a certain extent that the tape 5 bulges and blocks the second liquid injection port 101 when vacuuming.

[0057] The area of ​​the first injection port 2011 is S, S=π(D / 2) 2 The widths of the two guide grooves 102 are C1 and C2 respectively, satisfying (C1+C2)×a≥S, and C1≥0.3mm, C2≥0.3mm.

[0058] The projection of the guide groove 102 on the adhesive tape 5 exceeds the adhesive tape 5 , and the dimension exceeding the adhesive tape 5 is x, where x≥0.3 mm.

[0059] like Figure 2As shown, in the present application, both ends of the guide groove 102 extend beyond the tape 5. In some cases, the two ends of the guide groove 102 extend beyond the tape 5 to different sizes. Therefore, the above x≥0.3mm means that the end of the guide groove 102 with the smallest size extending beyond the tape 5 still needs to be greater than or equal to 0.3mm.

[0060] Based on the above parameters, this application carried out the implementation process shown in the following table:

[0061]

[0062] Based on the above table, in Example 1, all parameters were within the range, but the value range of a was close to the lower limit of the range. Although a was close to the lower limit, no failure occurred in the vacuuming and liquid injection stages.

[0063] On the contrary, in Example 7, when the value range of a exceeds the lower limit of the range, it causes blockage when evacuating the battery cells in the production line, resulting in abnormal vacuum evacuation.

[0064] In Example 2, all parameters are within the range, but the value of h is close to the lower limit of the range. Although h is close to the lower limit, no failure occurs in the vacuuming and liquid injection stages.

[0065] On the contrary, in Example 8, even if other parameters are within the range, only the value range of h exceeds the lower limit of the range, which will also cause blockage and abnormal vacuuming when the production line is producing battery cells.

[0066] In Example 3, all parameters are within the range, but the value ranges of C1 and C2 are close to the lower limit of the range. Although C1 and C2 are close to the lower limit, no failure occurs in the vacuuming and liquid injection stages.

[0067] On the contrary, in Example 9, even if other parameters are within the range, only the value range of C1 exceeds the lower limit of the range, which will also cause difficulty in liquid injection during production line production.

[0068] In Example 4, all parameters are within the range, but the value range of x is close to the lower limit of the range. Although x is close to the lower limit, it is still within the range, so no failure occurs during the vacuuming and liquid injection stages.

[0069] On the contrary, in Example 10, even if other parameters are within the range, only the value range of x exceeds the lower limit of the range, which will also cause difficulty in liquid injection during production line production.

[0070] In Example 5, all parameters are within the range, but the value range of (C1+C2)×a is close to the lower limit of the range. Although (C1+C2)×a is close to the lower limit, it is still within the range. Therefore, no failure occurs during the vacuuming and liquid injection stages.

[0071] On the contrary, in Example 11, even if other parameters are within the range, only the value range of (C1+C2)×a exceeds the lower limit of the range, which will also cause difficulty in liquid injection during production line production.

[0072] In Example 6 of the present application, all parameters are within the range, and the value range is far away from the lower limit. Therefore, no failure occurs during the vacuuming and liquid injection stages.

[0073] In the present application, the guide groove 102 exceeds the size of the tape 5, which means that the projection of the tape 5 on the first plastic part 1 cannot completely cover the guide groove 102, that is, there is a part of the guide groove 102 that exceeds the coverage of the tape 5, so that the gas in the shell 3 can be extracted and the electrolyte can be injected through the part of the guide groove 102 that exceeds the coverage of the tape 5.

[0074] It is understandable that in the actual liquid injection process, since the two guide grooves 102 in the present application are arranged at intervals to form a convex rib 1021 in the middle, the tape 5 can be supported by the convex rib 1021 and the first plastic part 1, so that the tape 5 can only fit with the side of the first plastic part 1 away from the cover plate body 2, avoiding the tape 5 from completely closing the second liquid inlet and the guide groove 102, so that the electrolyte can enter the guide groove 102 from the second liquid injection port 101 and flow in the guide groove 102. When the electrolyte flows to the part of the guide groove 102 covered by the tape 5, the electrolyte will enter the housing 3 to achieve the injection of the electrolyte.

[0075] Correspondingly, during the actual vacuuming process, when the tape 5 is in contact with the side of the first plastic part 1 facing away from the cover body 2, since the tape 5 cannot completely cover the guide groove 102, the gas in the shell 3 can enter the guide groove 102 through the guide groove 102 and the area covered by the tape 5, and be discharged through the second liquid injection port 101, thereby achieving the vacuuming operation.

[0076] In addition, the present invention further provides a battery, comprising a housing 3, an electrode group 4 and the above-mentioned cover assembly; the cover assembly covers the opening of the housing 3 to form a receiving space, and the electrode group 4 is arranged in the receiving space.

[0077] The battery using the cover assembly provided in the present application can have a faster liquid injection efficiency and a more stable vacuuming process, avoiding the problem of being unable to inject liquid or causing production line alarms due to the tape 5 blocking the liquid injection port.

[0078] It is understandable that if Figure 3As shown, after the pole ear 401 of the pole group 4 in the present application is connected to the connecting piece 402, it is covered and fastened by the tape 5, and the tape 5 is located between the connecting piece 402 and the first plastic part 1, and the position corresponding to the second injection port 101 also has the tape 5. Therefore, the present application can realize the flow of gas and liquid through the formed guide groove 102, thereby ensuring the stability and efficiency of the injection and vacuuming process.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cover plate assembly, characterized in that: It comprises a first plastic part (1) and a cover plate body (2); The cover plate body (2) is formed with a convex portion (201), a first liquid injection port (2011) penetrating the cover plate body (2) is formed in the convex portion (201), a groove (103) is formed in the first plastic part (1) at a position corresponding to the convex portion (201), and a first assembly gap (202) is formed between the edge of the convex portion (201) and the side wall of the groove (103); A second liquid injection port (101) is formed in the groove (103) at a position corresponding to the first liquid injection port (2011); a guide groove (102) is formed on a side of the first plastic part (1) away from the cover plate body (2) and along a first direction of the first plastic part (1); the guide groove (102) is connected to the second liquid injection port (101); and at least a portion of the guide groove (102) along the first direction exceeds the coverage area of ​​the adhesive tape (5) attached to the pole ear (401) and the connecting sheet (402) in the pole group (4) of the battery; The first direction is the length direction of the first plastic part (1); The projection of the guide groove (102) on the adhesive tape (5) exceeds the adhesive tape (5), and the dimension exceeding the adhesive tape (5) is x, where x≥0.3 mm; The diameter of the first liquid injection port (2011) is D, and D satisfies 2mm≤D≤5mm; The depth of the guide groove (102) is a, where a≥0.2 mm; The thickness of the first plastic part (1) at a position corresponding to the guide groove (102) is d, d≥0.3 mm, and the thickness of the first plastic part (1) at a position corresponding to the second liquid injection port (101) is h, h=a+d, and h≥0.6 mm; The area of ​​the first injection port is S, S=π(D / 2) 2 ; The widths of the two guide grooves (102) are C1 and C2 respectively, and C1≥0.3mm, C2≥0.3mm, and (C1+C2)×a≥S is required to be satisfied.

2. The cover plate assembly according to claim 1, characterized in that: There are at least two guide grooves (102), and the two guide grooves (102) are arranged in parallel and are connected to the second liquid injection port (101).

3. The cover plate assembly according to claim 1, characterized in that: The diameter of the second liquid injection port (101) is E, and E satisfies D+0.5mm≤E≤D+5mm.

4. The cover plate assembly according to claim 1, characterized in that: The size of the first assembly gap (202) is b, b≥0.3 mm, a second assembly gap (203) is formed between the end of the convex portion (201) and the bottom of the groove (103), and the second assembly gap (203) is g, g≥0.1 mm.

5. A battery, characterized in that: It comprises a housing (3), a pole group (4) and a cover plate assembly as claimed in any one of claims 1 to 4; The cover plate assembly covers the opening of the shell (3) to form a receiving space, and the pole group (4) is arranged in the receiving space.

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