Cover plate assembly and battery

Abstract

The invention provides a cover plate assembly and a battery, relates to the technical field of lithium batteries, and aims at optimizing the structure of the cover plate assembly to a certain extent, improving the liquid injection rate and avoiding the problem of production line alarm caused by blockage of a liquid injection port by adhesive tapes pasted on a pole group connecting piece and a pole lug in a vacuumizing process. The cover plate assembly provided by the invention comprises a first plastic part and a cover plate main body, a first liquid injection opening is formed in the cover plate main body, a second liquid injection opening is formed in the position, corresponding to the first liquid injection opening, of the first plastic part, an extension part is formed in the position, corresponding to the first liquid injection opening, of the cover plate main body and faces one side of the first plastic part, the extension part extends in the direction close to the first plastic part, and a liquid passing gap is formed between the end of the extension part and the second liquid injection opening; a liquid passing groove is formed in the position, corresponding to the second liquid injection opening, of the first plastic part, a liquid passing hole is formed in the edge position of the liquid passing groove, and at least part of the projection of the liquid passing hole in a shell of the battery is staggered with adhesive tape attached to a pole group connecting piece and a pole lug 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 includes a first plastic part and a cover plate body; a first liquid injection port is formed on the cover plate body, a second liquid injection port is formed on the first plastic part at a position corresponding to the first liquid injection port, an extension portion is formed on the cover plate body at a position corresponding to the liquid injection port and facing the first plastic part, the extension portion extends in a direction close to the first plastic part, and an end of the extension portion forms a liquid gap with the second liquid injection port; a liquid passage groove is formed on the first plastic part at a position corresponding to the second liquid injection port, a liquid passage hole is formed at an edge position of the liquid passage groove, and the projection of the liquid passage hole on the cover plate body is at least partially offset from the projection of the tape attached to the pole group connecting piece of the battery and the tape attached to the pole ear on the cover plate body.

[0006] Wherein, a third liquid injection port is formed on the cover plate body at a position corresponding to the first liquid injection port, and the centers of the third liquid injection port, the first liquid injection port and the second liquid injection port are on a collinear line.

[0007] Specifically, the diameter of the third liquid injection port is D, and D satisfies 2mm≤D≤5mm.

[0008] Furthermore, the diameter of the second liquid injection port is C, and C satisfies 2.5mm≤C≤10mm, 1.25≤C / D≤10.

[0009] Furthermore, the liquid gap is a, and a satisfies a≥4 / D, and 0.5mm≤a≤10mm.

[0010] The width of the projection of the liquid hole in the battery shell that does not overlap with the tape is e, and e≥0.3 mm.

[0011] Specifically, the length of the projection of the liquid hole in the battery shell that does not overlap with the tape is f, and f≥0.3 mm.

[0012] Furthermore, there are a plurality of liquid passage holes, and the plurality of liquid passage holes are arranged at intervals along the first direction of the first plastic part.

[0013] Furthermore, the thickness of the first plastic part at a position corresponding to the second liquid injection port is b, and b≥0.3 mm.

[0014] Compared with the prior art, the cover plate assembly provided by the present invention has the following advantages: The cover plate assembly provided by the present invention comprises a first plastic part and a cover plate body; a first liquid injection port is formed on the cover plate body, a second liquid injection port is formed on the first plastic part at a position corresponding to the first liquid injection port, an extension portion is formed on the cover plate body at a position corresponding to the first liquid injection port and toward one side of the first plastic part, the extension portion extends in a direction close to the first plastic part, and an end of the extension portion forms a liquid gap with the second liquid injection port; a liquid passing groove is formed on the first plastic part at a position corresponding to the second liquid injection port, a liquid passing hole is formed at an edge position of the liquid passing groove, and a projection of the liquid passing hole on the cover plate body at least partially staggers the projection of the tape mounted on the pole group connecting piece of the battery and the tape mounted on the pole ear on the cover plate body.

[0015] From this analysis, it can be seen that the first liquid injection port formed by the cover plate main body and the second liquid injection port formed at the position of the first plastic part corresponding to the first liquid injection port can allow the electrolyte and gas to enter or be discharged from the shell through the corresponding first liquid injection port and second liquid injection port during the liquid injection process and vacuum pumping process.

[0016] Since the cover plate body in the application is provided with an extension portion extending toward the first plastic part at the position corresponding to the first liquid injection port, on the one hand, the electrolyte passing through the first liquid injection port can accurately enter the second liquid injection port. On the other hand, since a liquid gap is formed between the end of the extension portion in the application and the second liquid injection port, when the tape at the position corresponding to the second liquid injection port in the shell blocks the second liquid injection port during the liquid injection or vacuuming process, the electrolyte can flow from the liquid gap to the outside of the edge of the second liquid injection port.

[0017] It can be understood that since a liquid groove is formed at the position of the first plastic part corresponding to the second liquid filling port in the present application, the electrolyte can enter the liquid groove through the liquid gap, and a liquid hole is formed at the edge position of the liquid groove in the present application, and the projection of the liquid hole on the cover body is staggered with the projection of the tape attached to the connecting piece of the battery pole group and the tape attached to the pole ear on the cover body, thereby avoiding the tape from blocking the second liquid filling port and the liquid hole at the same time, so that the electrolyte or the gas in the shell can flow through the liquid hole, thereby avoiding the problem of reduced injection efficiency or inability to discharge gas, causing production line alarms.

[0018] Furthermore, since a liquid hole is further formed on the first plastic part in the present application, the liquid injection efficiency and the vacuum extraction efficiency can be further improved.

[0019] 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.

[0020] 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

[0021] 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.

[0022] 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; 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; Figure 3 A partial cross-sectional view of a cover plate assembly provided in an embodiment of the present invention; Figure 4 A schematic diagram of a cover plate assembly provided in an embodiment of the present invention in which a portion of the liquid passage hole is blocked by a tape.

[0023] In the figure: 1-first plastic part; 101-second liquid injection port; 102-liquid flow groove; 1021-liquid flow hole; 2-cover plate body; 201-first liquid injection port; 202-liquid flow gap; 203-third liquid injection port; 3-shell; 4-pole group; 401-pole ear; 402-connecting piece; 5-tape; S1 - first direction. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figure 1 Combination Figure 2 As shown, the present invention provides a cover assembly, including a first plastic part 1 and a cover body 2; the cover body 2 is formed with a first liquid injection port 201, the first plastic part 1 is formed with a second liquid injection port 101 at a position corresponding to the first liquid injection port 201, the cover body 2 is formed with an extension portion at a position corresponding to the liquid injection port and toward one side of the first plastic part 1, the extension portion extends in a direction close to the first plastic part 1, and the end of the extension portion and the second liquid injection port 101 form a liquid gap 202; the first plastic part 1 is formed with a liquid groove 102 at a position corresponding to the second liquid injection port 101, and a liquid hole 1021 is formed at an edge position of the liquid groove 102, and the projection of the liquid hole 1021 on the cover body 2 at least partially staggers the projection of the tape 5 mounted on the connecting piece 402 of the battery pole group 4 and the tape 5 mounted on the pole ear 401 on the cover body 2.

[0034] Compared with the prior art, the cover plate assembly provided by the present invention has the following advantages: The cover assembly provided by the present invention, through the first liquid injection port 201 formed by the cover plate main body 2, and the second liquid injection port 101 formed at the position of the first plastic part 1 corresponding to the first liquid injection port 201, can allow electrolyte and gas to enter or be discharged from the shell 3 through the corresponding first liquid injection port 201 and second liquid injection port 101 during the liquid injection process and vacuum extraction process.

[0035] Since the cover plate body 2 in the application is provided with an extension portion extending toward the first plastic part 1 at the position corresponding to the first liquid injection port 201, on the one hand, the electrolyte passing through the first liquid injection port 201 can accurately enter the second liquid injection port 101. On the other hand, since a liquid gap 202 is formed between the end of the extension portion in the present application and the second liquid injection port 101, when the tape 5 at the position corresponding to the second liquid injection port 101 in the shell 3 blocks the second liquid injection port 101 during the liquid injection or vacuuming process, the electrolyte can flow from the liquid gap 202 to the outside of the edge of the second liquid injection port 101.

[0036] It can be understood that since a liquid groove 102 is formed at the position of the first plastic part 1 corresponding to the second liquid injection port 101 in the present application, the electrolyte can enter the liquid groove 102 through the liquid gap 202, and a liquid hole 1021 is formed at the edge of the liquid groove 102 in the present application, and the projection of the liquid hole 1021 on the cover body 2 is staggered with the projection of the tape 5 attached to the connecting piece 402 of the battery pole group 4 and the tape 5 attached to the pole ear 401 on the cover body 2, thereby avoiding the tape 5 from blocking the second liquid injection port 101 and the liquid hole 1021 at the same time, so that the electrolyte or the gas in the shell 3 flows through the liquid hole 1021, thereby avoiding the problem of reduced injection efficiency or inability to discharge gas, causing production line alarms.

[0037] Furthermore, since a liquid passage hole 1021 is further formed on the first plastic part 1 in the present application, the liquid injection efficiency and the vacuum extraction efficiency can be further improved.

[0038] Alternatively, if Figure 3 As shown, in the cover plate assembly provided by the present invention, a third liquid injection port 203 is formed at a position of the cover plate body 2 corresponding to the first liquid injection port 201, and the centers of the third liquid injection port 203, the first liquid injection port 201 and the second liquid injection port 101 are collinear.

[0039] In the present application, the third liquid injection port 203 formed on the cover body 2 can realize the above-mentioned liquid injection function and vacuum exhaust function. Of course, in addition to the above-mentioned structure, the battery cover assembly is also composed of upper plastic, explosion-proof valve, protective film and other structures, and other structural parts are the same as the existing structure, which will not be repeated here.

[0040] Alternatively, if Figure 3As shown, the diameter of the third injection port 203 in the present application is D, and D satisfies 2mm≤D≤5mm. The diameter of the second injection port 101 is C, and C satisfies 2.5mm≤C≤10mm, 1.25≤C / D≤10.

[0041] Since the third injection port 203 in the present application is the first injection port that the electrolyte needs to enter first, the injection process is more controllable, thereby making the accuracy higher, so the diameter of the third injection port 203 does not need to be large. Since the electrolyte enters the housing 3 through the second injection port 101, by making the diameter of the second injection port 101 larger than the diameter of the third injection port 203, even if the electrolyte is slightly scattered during the injection process, it can accurately enter the second injection port 101 and finally flow into the housing 3 to complete the injection.

[0042] It can be understood that since the position of the first plastic part 1 corresponding to the second liquid injection port 101 is formed with a liquid flow groove 102, even if there is electrolyte that flies out of the range of the second liquid injection port 101, it can eventually enter the shell 3 through the liquid flow hole 1021 at the edge of the liquid flow groove 102, thereby ensuring the injection efficiency.

[0043] Alternatively, if Figure 3 As shown, the liquid gap 202 in the present application is a, and a satisfies a≥4 / D, and 0.5mm≤a≤10mm.

[0044] After the tape 5 blocks the second liquid filling port 101, the flow of electrolyte and the flow of gas both need to be achieved through the liquid gap 202. Therefore, the present application ensures that the liquid filling and vacuuming processes are carried out smoothly by making the liquid gap 202 satisfy a≥4 / D and 0.5mm≤a≤10mm.

[0045] Alternatively, if Figure 4 As shown, the width of the projection of the liquid hole 1021 in the present application that is inside the housing 3 and does not overlap with the tape 5 is e, and e≥0.3 mm.

[0046] Alternatively, if Figure 4 As shown, the length of the projection of the liquid hole 1021 in the present application in the housing 3 and not overlapping with the tape 5 is f, and f≥0.3 mm.

[0047] Based on the above parameters, this application carried out the implementation process shown in the following table:

[0048] Based on the above table, it can be seen that in Example 1, C / D is close to the lower limit, but still within the range, and other dimensions are selected within the range, so no failure occurs during the vacuuming and liquid injection stages; In Example 2, D, C, and a are all selected at the lower limit of the range, so that C / D is also close to the lower limit, but still within the range, and other dimensions are selected within the range, so no failure occurs during the vacuuming and liquid injection stages; In Example 3, e is selected as the lower limit of the range, and other dimensions are selected within the range, so no failure occurs during the vacuuming and liquid injection stages; In Example 4, f is selected as the lower limit of the range, and other dimensions are selected within the range, so no failure occurs during the vacuuming and liquid injection stages; In Example 5, the parameters D, C, a, e, f and C / D are all selected within the range and are not close to the endpoint values. Therefore, no failure occurs during the vacuuming and liquid injection stages.

[0049] In Example 6, the dimensions of C and D are controlled so that C / D is lower than 1.25, which makes it difficult to install the rubber plug during production line production.

[0050] In Example 7, a was controlled to be 0.8 and D was controlled to be 4. Therefore, a was less than 4 / D, which resulted in blockage and abnormal vacuuming when the battery cells were vacuumed in the production line.

[0051] In Example 8, the size of a was controlled so that a was lower than the range of 0.5 mm, which resulted in blockage and abnormal vacuuming when the battery cells were vacuumed in the production line.

[0052] In Example 9, the size of e was controlled so that e was lower than the range of 0.3 mm, which resulted in difficulty in injecting liquid during production line production.

[0053] In Example 10, the size of f was controlled so that f was lower than the range of 0.3 mm, which resulted in difficulty in injecting liquid during production line production.

[0054] The above parameters are controlled to ensure the electrolyte injection rate, and the electrolyte will not bubble out while the electrolyte is quickly injected and vacuumed.

[0055] Preferably, if Figure 1 Combination Figure 2 As shown, there are multiple liquid passage holes 1021 in the present application, and the multiple liquid passage holes 1021 are arranged at intervals along the first direction S1 of the first plastic part 1.

[0056] In the present application, the first direction S1 of the first plastic part 1 is the width direction of the first plastic part 1. Since the size of the first plastic part 1 in the width direction is limited, two liquid holes 1021 are designed in the present application. On the one hand, they can meet the liquid and gas passing requirements, and on the other hand, they will not affect the structural strength of the first plastic part 1.

[0057] Correspondingly, the thickness of the first plastic part 1 in the present application at the position corresponding to the second liquid injection port 101 is b, and b≥0.3 mm, thereby being able to ensure the structural strength of the first plastic part 1 to a certain extent and improving the stability of the overall junction cover plate assembly.

[0058] 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.

[0059] 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.

[0060] It is understandable that if Figure 3 As 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 liquid injection port 101 also has the tape 5. Therefore, the present application can realize the flow of gas and liquid through the formed liquid hole 1021, thereby ensuring the stability and efficiency of the liquid injection and vacuuming process.

[0061] 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 first liquid injection port (201), the first plastic part (1) is formed with a second liquid injection port (101) at a position corresponding to the first liquid injection port (201), the cover plate body (2) is formed with an extension portion at a position corresponding to the liquid injection port and on a side facing the first plastic part (1), the extension portion extends in a direction approaching the first plastic part (1), and an end of the extension portion and the second liquid injection port (101) form a liquid gap (202); A liquid passage groove (102) is formed on the first plastic part (1) at a position corresponding to the second liquid injection port (101), and a liquid passage hole (1021) is formed at an edge of the liquid passage groove (102), wherein the projection of the liquid passage hole (1021) on the cover plate body (2) is at least partially offset from the projection of the tape (5) attached to the connecting piece (402) of the battery electrode group (4) and the tape (5) attached to the electrode ear (401) on the cover plate body (2).

2. The cover plate assembly according to claim 1, characterized in that: The cover plate body (2) is formed with a third liquid injection port (203) at a position corresponding to the first liquid injection port (201), and the centers of the third liquid injection port (203), the first liquid injection port (201) and the second liquid injection port (101) are collinear.

3. The cover plate assembly according to claim 2, characterized in that: The diameter of the third liquid injection port is D, and D satisfies 2mm≤D≤5mm.

4. The cover plate assembly according to claim 3, characterized in that: The diameter of the second liquid injection port (101) is C, and C satisfies 2.5 mm≤C≤10 mm, 1.25≤C / D≤10.

5. The cover plate assembly according to claim 3, characterized in that: The liquid gap (202) is a, and a satisfies a≥4 / D, and 0.5mm≤a≤10mm.

6. The cover plate assembly according to claim 1, characterized in that: The width of the projection of the liquid passage hole (1021) in the battery housing (3) and not overlapping with the adhesive tape (5) is e, and e≥0.3 mm.

7. The cover plate assembly according to claim 1, characterized in that: The length of the projection of the liquid passage hole (1021) in the battery housing (3) that does not overlap with the adhesive tape (5) is f, and f≥0.3 mm.

8. The cover plate assembly according to claim 1, characterized in that: There are a plurality of liquid passage holes (1021), and the plurality of liquid passage holes (1021) are arranged at intervals along the first direction of the first plastic part (1).

9. The cover plate assembly according to claim 1, characterized in that: The thickness of the first plastic part (1) at a position corresponding to the second liquid injection port (101) is b, and b≥0.3 mm.

10. 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 9; 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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