Top cover structure and single battery cell

Abstract

The utility model discloses a top cover structure and a single battery cell, and relates to the technical field of batteries. The top cover structure comprises a cover plate sheet, a pole assembly, upper plastic cement and a sealing assembly, wherein the cover plate sheet is provided with a mounting hole; the polar column assembly comprises a polar column and a connecting column, the polar column is arranged on the cover plate sheet, and the connecting column penetrates through the mounting hole and is fixedly connected with the polar column; the upper plastic is arranged between the cover plate sheet and the pole; the sealing assembly is at least partially located between the cover plate sheet and the pole assembly, and the sealing assembly can seal a gap between the pole and the upper plastic and a gap between the upper plastic and the cover plate sheet. According to the top cover structure, the problems of liquid short circuit and corrosion between the pole and the cover plate sheet can be avoided, and the safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a top cap structure and single cell. BACKGROUND

[0002] Today, environmental problems and energy crisis are becoming more and more serious, energy saving and emission reduction has become a new topic faced by the whole world. As the representative of green traffic, electric vehicles have the advantages of energy saving, environmental protection, cleaning compared with traditional fuel vehicles, which reduces the environmental protection cost and economic cost of vehicle use. For power battery, the sealing performance of battery cover plate is the key to determine the sealing performance of single cell, and the sealing performance of single cell affects the safety of single cell and power battery.

[0003] Generally speaking, the battery cover plate mainly realizes sealing by setting the sealing ring. However, the sealing ring is usually set between the cover plate sheet and the connecting column, which is used to prevent the internal electrolyte from leaking to the outside of the single cell, but cannot avoid the internal leakage of external liquid. If the external liquid leaks between the pole column and the upper plastic and between the upper plastic and the cover plate sheet, it is easy to cause short circuit and corrosion between the pole column and the cover plate sheet, which affects the safety in use. SUMMARY

[0004] The utility model discloses a top cap structure and single cell, which can avoid the problem of liquid short circuit and corrosion between the pole column and the cover plate sheet, and improve the safety.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] A top cap structure, comprising:

[0007] A cover plate sheet, the cover plate sheet is provided with a mounting hole;

[0008] A pole column assembly, comprising a pole column and a connecting column, the pole column is arranged on the cover plate sheet, the connecting column is arranged in the mounting hole and fixedly connected with the pole column;

[0009] An upper plastic, the upper plastic is arranged between the cover plate sheet and the pole column;

[0010] A sealing assembly, the sealing assembly is at least partially located between the cover plate sheet and the pole column assembly, the sealing assembly can seal the gap between the pole column and the upper plastic and can seal the gap between the upper plastic and the cover plate sheet.

[0011] As an optional solution of the above-mentioned top cap structure, the upper plastic is provided with a through hole, the connecting column is arranged in the through hole, and the sealing assembly comprises a first sealing ring, the first sealing ring sealingly abuts against the inner wall of the through hole and the side wall of the connecting column.

[0012] As an alternative to the above-mentioned top cover structure, the connecting column comprises a column body and a first connecting portion connected with the column body and located below the cover plate sheet, the first sealing ring comprises a sealing portion located between the cover plate sheet and the column body and a first flange protruding from the outer periphery of the sealing portion, and the first flange is located between the first connecting portion and the cover plate sheet.

[0013] As an alternative to the above-mentioned top cover structure, the sealing portion abuts against the pole column.

[0014] As an alternative to the above-mentioned top cover structure, the first sealing ring comprises a second flange protruding from the outer periphery of the sealing portion, the second flange is located between the cover plate sheet and the pole column, and the second flange sealingly abuts against the inner wall of the through hole.

[0015] As an alternative to the above-mentioned top cover structure, the top cover structure further comprises a lower plastic, and the lower plastic is arranged between the first connecting portion and the cover plate sheet.

[0016] As an alternative to the above-mentioned top cover structure, the sealing assembly further comprises a second sealing ring located between the pole column and the cover plate sheet, and the second sealing ring sealingly abuts against the pole column and the cover plate sheet, respectively.

[0017] As an alternative to the above-mentioned top cover structure, the upper plastic comprises a first insulation portion and a second insulation portion, both of which are located between the cover plate sheet and the pole column, the first insulation portion and the second insulation portion are arranged in a radial direction of the pole column assembly, the first insulation portion is located outside the second insulation portion, the second sealing ring is located between the first insulation portion and the second insulation portion, and the second sealing ring sealingly abuts against the first insulation portion.

[0018] As an alternative to the above-mentioned top cover structure, the top surface of the cover plate sheet is provided with an annular clamping protrusion, and the upper plastic is provided with an annular groove, and the clamping protrusion is clamped into the annular groove.

[0019] A single cell comprises the above-mentioned top cover structure and further comprises an outer shell provided with an opening, and the top cover structure is connected with the outer shell and covers the opening.

[0020] The utility model has the advantages of:

[0021] The utility model provides a kind of top cover structure and single battery. In the top cover structure, connecting post passes through the mounting hole of cover sheet and will pole fixed on cover sheet, and upper plastic is set between cover sheet and pole to prevent cover sheet and pole contact short circuit occurs. Sealing assembly is at least partially arranged between cover sheet and connecting post, can play the problem of avoiding internal electrolyte leakage. And sealing assembly can also be the gap between pole and upper plastic and the gap between upper plastic and cover sheet sealed apart, this guarantees that pole and cover sheet cannot be right outwardly inwardly seeped liquid short circuit and corrosion.

[0022] The top cover structure can avoid the problem of pole and cover sheet being short-circuited and corroded by liquid, and improve safety. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the top view of the top cover structure provided by the utility model;

[0024] Figure 2 is the sectional view of the top cover structure provided by the utility model Figure 1 ;

[0025] Figure 3 is Figure 2 the local enlarged view of A in the figure;

[0026] Figure 4 is the sectional view of the top cover structure provided by the utility model Figure 2 ;

[0027] Figure 5 is Figure 4 the local enlarged view of B in the figure.

[0028] In the figure:

[0029] 1, cover sheet; 11, liquid injection hole; 12, explosion-proof valve; 13, clamping protrusion;

[0030] 2, pole assembly; 21, pole; 22, connecting post; 221, column body; 222, first connecting part; 223, second connecting part;

[0031] 3, first sealing ring; 31, sealing part; 32, first flange; 33, second flange;

[0032] 4, second sealing ring;

[0033] 5, upper plastic; 51, first insulating part; 52, second insulating part;

[0034] 6, lower plastic. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0036] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0037] Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0038] Unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include that the first feature and the second feature are in direct contact, or the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] The technical scheme of the present application is further illustrated below by combining the drawings and through specific embodiments.

[0040] The present embodiment provides a single battery cell, which comprises a shell, a pole group and a top cover structure, the shell is provided with an opening, the pole group comprises a positive plate, a diaphragm and a negative plate, the positive plate, the diaphragm and the negative plate are placed in the shell in a certain form, and the top cover structure is covered on the opening of the shell. Figure 1As shown, the top cover structure includes a liquid injection hole 11, through which electrolyte is injected into the shell, and finally the liquid injection hole 11 is sealed, i.e. the production of the single battery cell is completed.

[0041] As shown, the top cover structure includes a liquid injection hole 11, through which electrolyte is injected into the shell, and finally the liquid injection hole 11 is sealed, i.e. the production of the single battery cell is completed. Figure 1 and Figure 2 As shown, in order to enable the single battery cell to be normally charged and discharged, the top cover structure includes a cover plate 1 for closing the opening of the shell and a pole assembly 2 including a pole 21 and a connecting pole 22, the pole 21 being arranged above the cover plate 1, and the connecting pole 22 being arranged through the mounting hole and fixedly connected to the pole 21, so as to fix the pole 21 on the cover plate 1. In order to ensure the safety of the single battery cell, the top cover structure is further provided with an explosion-proof valve 12, which can be broken when thermal runaway occurs inside the single battery cell, so as to play a pressure relief role.

[0042] It is worth noting that, in the present embodiment, the upper side of the cover plate 1 refers to the side of the cover plate 1 away from the shell, and the lower side of the cover plate 1 refers to the side of the cover plate 1 towards the shell.

[0043] In order to correspond to the positive and negative tabs of the pole group, the top cover structure includes two pole assemblies 2, the connecting pole 22 of one pole assembly 2 being connected to the positive tab through an adapter piece, and the connecting pole 22 of the other pole assembly 2 being connected to the negative tab through an adapter piece. Figure 3 As shown, in order to facilitate the connection of the connecting pole 22 to the adapter piece, and also to enable the connecting pole 22 to fix the pole 21 on the cover plate 1, the connecting pole 22 includes a pole body 221 and a first connecting portion 222, the first connecting portion 222 being connected to the pole body 221 and being located below the cover plate 1, the first connecting portion 222 being located below the cover plate 1, and the first connecting portion 222 being capable of clamping the cover plate 1 with the pole 21 to play a fixing role.

[0044] In the present embodiment, the connecting pole 22 further includes a second connecting portion 223, the second connecting portion 223 being arranged at one end of the pole body 221 away from the first connecting portion 222, the pole body 221 being arranged through the pole 21, and the second connecting portion 223 and the first connecting portion 222 being capable of clamping and fixing the top cover assembly into an integral structure, so as to prevent the loose movement of the components of the top cover assembly. In order to ensure the flatness of the surface of the pole 21, the pole 21 has a counterbore, and the second connecting portion 223 is arranged in the counterbore.

[0045] Specifically, the connecting pole 22 is a rivet, the initial rivet including the pole body 221 and the first connecting portion 222, after the structure of the top cover assembly is assembled, the pole 21 is sleeved on the pole body 221, and then the end of the pole body 221 away from the first connecting portion 222 is pressed or struck against the end of the pole body 221, so that the end of the pole body 221 is deformed to form the second connecting portion 223, thereby forming an integral structure of the battery cover plate.

[0046] As shown in Figure 2 and Figure 3 In order to avoid the short circuit between the pole assembly 2 and the cover plate 1, the top cover structure further comprises an upper plastic 5 and a lower plastic 6, the upper plastic 5 is arranged between the cover plate 1 and the pole 21, and the lower plastic 6 is arranged between the first connecting part 222 and the cover plate 1, so as to separate the pole 21 and the connecting column 22 from the cover plate 1.

[0047] Further, the top surface of the cover plate 1 is provided with an annular clamping protrusion 13, and the upper plastic 5 is provided with a ring groove, and the clamping protrusion 13 is clamped into the ring groove. The clamping protrusion 13 and the ring groove are clamped and matched, on the one hand, it is convenient for positioning the upper plastic 5, and ensures the installation precision, on the other hand, it can also ensure that the upper plastic 5 will not be distorted due to pressure when the column 221 is riveted and fixed, and the function of the upper plastic 5 is ensured.

[0048] For the power battery, in order to ensure the safety of the single battery cell, the top cover structure needs to be sealed to avoid leakage of electrolyte. Generally speaking, the battery cover plate mainly realizes sealing by arranging a sealing ring. However, the sealing ring is usually arranged between the cover plate 1 and the connecting column 22, which is used to prevent the internal electrolyte from leaking to the outside of the single battery cell, but cannot avoid the leakage of the external liquid to the inside. If the external liquid leaks between the pole 21 and the upper plastic 5 and between the upper plastic 5 and the cover plate 1, it is easy to cause the short circuit and corrosion of the pole 21 and the cover plate 1, which affects the safety in use.

[0049] In order to solve the above problems, the top cover structure provided by the embodiment further comprises a sealing assembly, the sealing assembly is at least partially located between the cover plate 1 and the pole 21 or the connecting column 22, and the sealing assembly can seal the gap between the pole 21 and the upper plastic 5 and the gap between the upper plastic 5 and the cover plate 1.

[0050] The sealing assembly is at least partially arranged between the cover plate 1 and the connecting column 22, which can avoid the problem of internal electrolyte leakage. The sealing assembly can also seal and separate the gap between the pole 21 and the upper plastic 5 and the gap between the upper plastic 5 and the cover plate 1, which ensures that the pole 21 and the cover plate 1 will not be short-circuited and corroded by the liquid leaking to the inside.

[0051] The top cover structure can avoid the problem of short circuit and corrosion between the pole 21 and the cover plate 1, and improve the safety.

[0052] Embodiment one

[0053] As shown in Figure 3As shown, the upper plastic 5 has a through hole, and the connecting post 22 passes through the through hole. The sealing assembly includes a first sealing ring 3, which seals against the inner wall of the through hole and the side wall of the connecting post 22. Since the gap between the pole post 21 and the upper plastic 5 and the gap between the upper plastic 5 and the cover plate 1 are located on the upper and lower sides of the cover plate 1, respectively, when the first sealing ring 3 seals against the inner wall of the through hole, it can ensure that the liquid leaking from the outside to the inside into the gap between the pole post 21 and the upper plastic 5 will not come into contact with the gap between the upper plastic 5 and the cover plate 1, thus avoiding the problem of short circuit and corrosion between the pole post 21 and the cover plate 1 due to liquid.

[0054] Furthermore, the first sealing ring 3 includes a sealing portion 31 and a first flange 32 protruding from the outer periphery of the sealing portion 31. The sealing portion 31 is located between the cover plate 1 and the column 221, and the first flange 32 is located between the first connecting portion 222 and the cover plate 1. The cross-section of the first sealing ring 3 is L-shaped, which allows the first sealing ring 3 to be compressed from two mutually perpendicular directions to achieve a sealing effect, greatly improving the sealing performance.

[0055] It is worth noting that the L-shaped first sealing ring 3 seals against the inner wall of the through hole through the side of the sealing part 31. Therefore, it is necessary to ensure that the inner wall of the through hole of the upper plastic 5 is flush with the inner wall of the mounting hole of the cover plate 1, or that the inner wall of the through hole of the upper plastic 5 is located inside the inner wall of the mounting hole of the cover plate 1, so that the upper plastic 5 can also have sufficient pressure against the sealing part 31 to ensure the sealing performance when it deforms elastically.

[0056] Furthermore, the sealing part 31 abuts against the electrode post 21. By abutting the sealing part 31 against the electrode post 21, the path length of the electrolyte leaking from inside the casing through the gap between the first sealing ring 3 and the electrode post assembly 2 can be further increased. Moreover, since the electrode post 21 and the connecting post 22 are riveted together, the above structure can also increase the compressive force on the first sealing ring 3, thereby improving the sealing performance and reducing the possibility of electrolyte leakage.

[0057] like Figure 3 As shown, the first sealing ring 3 includes a second flange 33, which protrudes from the outer periphery of the sealing part 31. The second flange 33 is located between the cover plate 1 and the pole post 21, and it seals against the inner wall of the through hole. The second flange 33 is used to elastically abut against the inner wall of the through hole to ensure that the seal between the first sealing ring 3 and the upper plastic 5 is mainly achieved through the elastic deformation of the second flange 33, thus ensuring the sealing performance. Moreover, since the connecting post 22 needs to be riveted and deformed, the first flange 32 and the second flange 33 on both sides of the cover plate 1 can simultaneously withstand the pressure applied from above and below, so that the first sealing ring 3 is evenly compressed. The first flange 32 and the second flange 33 simultaneously play a sealing role, avoiding uneven deformation due to excessive local pressure, which would affect the sealing performance.

[0058] Embodiment two

[0059] This embodiment is an improvement on the sealing assembly of embodiment one.

[0060] As shown in Figure 4 and Figure 5 , the sealing assembly further comprises a second sealing ring 4, which is located between the pole post 21 and the cover plate 1 and sealingly abuts one of the pole post 21 and the cover plate 1. This embodiment adds the second sealing ring 4 on the basis of the first sealing ring 3. Since the second sealing ring 4 sealingly abuts at least one of the pole post 21 and the cover plate 1, the second sealing ring 4 at least intercepts one of the leakage paths between the pole post 21 and the upper plastic 5 and between the upper plastic 5 and the cover plate 1, so as to ensure that the liquids in the two leakage paths do not meet, thereby avoiding the problem of short circuit and corrosion between the pole post 21 and the cover plate 1, and improving the safety.

[0061] Specifically, the second sealing ring 4 can be arranged between the pole post 21 and the upper plastic 5, or between the upper plastic 5 and the cover plate 1.

[0062] In some embodiments, the second sealing ring 4 sealingly abuts both the pole post 21 and the cover plate 1. In this structure, the second sealing ring 4 can intercept both leakage paths, further improving the safety.

[0063] As shown in Figure 4 and Figure 5 , since the upper plastic 5 is arranged between the pole post 21 and the cover plate 1, in order to enable the second sealing ring 4 to abut both the pole post 21 and the cover plate 1, the upper plastic 5 comprises a first insulating portion 51 and a second insulating portion 52, both of which are located between the cover plate 1 and the pole post 21, and the first insulating portion 51 and the second insulating portion 52 are arranged in a radial direction of the pole post assembly 2. The second sealing ring 4 is located between the first insulating portion 51 and the second insulating portion 52, and sealingly abuts the first insulating portion 51.

[0064] At this time, the second sealing ring 4 not only can avoid short circuit between the cover plate 1 and the pole post 21, but also greatly shortens the length of the two leakage paths, thereby reducing the corrosion of corrosive liquid to the cover plate 1 and the pole post 21.

[0065] The above is only a preferred embodiment of the present application. For those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A roof structure, characterized in that The utility model relates to a top cover structure of a battery, which comprises: a cover plate (1) provided with a mounting hole; a pole assembly (2) comprising a pole (21) and a connecting column (22), wherein the pole (21) is arranged on the cover plate (1), and the connecting column (22) is arranged in the mounting hole and fixedly connected with the pole (21); an upper plastic (5) arranged between the cover plate (1) and the pole (21); a sealing assembly arranged at least partially between the cover plate (1) and the pole assembly (2), which can seal the gap between the pole (21) and the upper plastic (5) and the gap between the upper plastic (5) and the cover plate (1).

2. The roof structure of claim 1, wherein, The upper plastic (5) is provided with a through hole, the connecting column (22) is arranged in the through hole, and the sealing assembly comprises a first sealing ring (3) which is in sealing abutment with the inner wall of the through hole and the side wall of the connecting column (22).

3. The roof structure of claim 2, wherein, The connecting column (22) comprises a column body (221) and a first connecting portion (222), the first connecting portion (222) is connected with the column body (221) and arranged below the cover plate (1), the first connecting portion (222) is arranged below the cover plate (1), the first sealing ring (3) comprises a sealing portion (31) and a first flange (32) protruding from the outer periphery of the sealing portion (31), the sealing portion (31) is arranged between the cover plate (1) and the column body (221), and the first flange (32) is arranged between the first connecting portion (222) and the cover plate (1).

4. The roof structure of claim 3, wherein, The sealing portion (31) is in abutment with the pole (21).

5. The roof structure of claim 3, wherein, The first sealing ring (3) comprises a second flange (33) protruding from the outer periphery of the sealing portion (31), the second flange (33) is arranged between the cover plate (1) and the pole (21), and the second flange (33) is in sealing abutment with the inner wall of the through hole.

6. The roof structure of claim 3, wherein, The top cover structure further comprises a lower plastic (6) arranged between the first connecting portion (222) and the cover plate (1).

7. The roof structure of claim 1, wherein The sealing assembly further comprises a second sealing ring (4) arranged between the pole (21) and the cover plate (1), and the second sealing ring (4) is in sealing abutment with the pole (21) and the cover plate (1), respectively.

8. The roof structure of claim 7, wherein, The upper plastic (5) comprises a first insulation part (51) and a second insulation part (52), the first insulation part (51) and the second insulation part (52) are both located between the cover plate sheet (1) and the pole (21), the first insulation part (51) and the second insulation part (52) are arranged in a radial direction of the pole assembly (2) and are spaced apart, the first insulation part (51) is located outside the second insulation part (52), the second sealing ring (4) is located between the first insulation part (51) and the second insulation part (52), and the second sealing ring (4) is in sealing abutment with the first insulation part (51).

9. The roof structure according to any one of claims 1 to 8, characterized in that The top surface of the cover plate sheet (1) is provided with an annular clamping protrusion (13), the upper plastic (5) is provided with an annular groove, and the clamping protrusion (13) is clamped into the annular groove.

10. A monobloc cell characterized in that, The top cover structure comprises the top cover structure according to any one of claims 1-9, and a shell, wherein the shell is provided with an opening, and the top cover structure is connected with the shell and covers the opening.

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