Battery cover plate, battery monomer and battery pack

Abstract

The utility model discloses a battery cover plate, a battery monomer and a battery pack. The battery cover plate comprises a cover plate body, a pressure release valve, a lower insulating part and a buffer plate, a valve mounting hole is formed in the cover plate body, the pressure release valve is mounted in the valve mounting hole, the lower insulating part is arranged on the inner side of the cover plate body and provided with an exhaust hole opposite to the pressure release valve, the buffer plate is located between the cover plate body and the lower insulating part and covers the exhaust hole, and a ventilation structure is formed on the buffer plate. According to the battery cover plate disclosed by the embodiment of the utility model, the exhaust hole opposite to the pressure release valve is formed in the lower insulating part, the buffer plate covers the exhaust hole, and the ventilation structure is formed on the buffer plate, so that a gas circulation channel is smooth by the ventilation structure, and normal pressure release of the pressure release valve can be ensured; and the buffer plate can play a role in buffering the electrolyte flowing to the pressure release valve, so that the possibility that the pressure release valve is damaged or the pressure release valve is opened in advance due to the impact of the electrolyte on the pressure release valve can be reduced, and the service life of the pressure release valve can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover, a battery monomer and a battery pack. Background Art

[0002] In the related art, when the battery pack shakes, the electrolyte in the battery pack will shake accordingly, and the electrolyte near the pressure relief valve may impact the pressure relief valve. Especially when the pressure relief valve is located at the bottom of the battery cell, the electrolyte in the battery cell is affected by its own gravity, and some of the electrolyte will gather near the pressure relief valve, which may cause the pressure relief valve to be damaged and the electrolyte to leak through the pressure relief valve. It may also cause the pressure relief valve to misjudge the internal and external air pressure difference and open prematurely, which increases safety hazards and affects the service life of the pressure relief valve, and needs to be solved urgently. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery cover, which is provided with an exhaust hole opposite to the pressure relief valve formed on the lower insulating member, a buffer sheet covers the exhaust hole and a ventilation structure is formed on the buffer sheet, the ventilation structure can make the gas flow channel smooth, thereby ensuring the normal pressure relief of the pressure relief valve, and the buffer sheet can buffer the electrolyte flowing to the pressure relief valve, which can reduce the impact of the electrolyte on the pressure relief valve and cause the pressure relief valve to be damaged or the pressure relief valve to open prematurely, thereby extending the service life of the pressure relief valve.

[0004] The utility model provides a battery monomer with the battery cover plate.

[0005] The utility model also provides a battery pack having the battery monomer.

[0006] According to the battery cover of the first aspect of the present invention, the battery cover includes: a cover body, a valve mounting hole is formed on the cover body; a pressure relief valve, the pressure relief valve is installed in the valve mounting hole; a lower insulating member, the lower insulating member is arranged on the inner side of the cover body and has an exhaust hole opposite to the pressure relief valve; a buffer sheet, the buffer sheet is located between the cover body and the lower insulating member and covers the exhaust hole, and a ventilation structure is formed on the buffer sheet.

[0007] According to the battery cover plate of the embodiment of the utility model, an exhaust hole opposite to the pressure relief valve is formed on the lower insulating member, a buffer sheet covers the exhaust hole and a ventilation structure is formed on the buffer sheet. The ventilation structure can make the gas flow channel smooth, thereby ensuring the normal pressure relief of the pressure relief valve, and the buffer sheet can buffer the electrolyte flowing to the pressure relief valve, which can reduce the impact of the electrolyte on the pressure relief valve and cause the pressure relief valve to be damaged or the pressure relief valve to open prematurely, thereby extending the service life of the pressure relief valve.

[0008] According to some embodiments of the present invention, the buffer sheet is fixed to the lower insulating member.

[0009] According to some embodiments of the present invention, the buffer sheet is bonded to the lower insulating member.

[0010] According to some embodiments of the utility model, a receiving groove is formed on a side of the lower insulating member facing the pressure relief valve, the exhaust hole is formed on a bottom wall of the receiving groove, and the buffer sheet is received in the receiving groove.

[0011] According to some embodiments of the present invention, the depth of the accommodating groove is greater than the thickness of the buffer sheet.

[0012] According to some embodiments of the present invention, the ventilation structure includes two sub-ventilation structures, and the two sub-ventilation structures are located at two ends of the buffer sheet in the length direction, and at least parts of the sub-ventilation structures are opposite to the exhaust holes.

[0013] According to some embodiments of the utility model, the sub-ventilation structure is formed as an elongated strip hole extending along the width direction of the buffer sheet, the extension length of the exhaust hole in the length direction of the cover plate body is k, the pressure relief valve includes a valve seat and a valve sheet, the valve sheet is arranged on the valve seat, the extension length of the valve sheet in the length direction of the cover plate body is h, the inner distance between the two sub-ventilation structures is m, the outer distance between the two sub-ventilation structures is n, and k, h, m, and n satisfy: h<m<k<n.

[0014] According to some embodiments of the present invention, the thickness of the buffer sheet is in the range of 0.03 mm to 0.3 mm; and / or the buffer sheet is a plastic part, and the buffer sheet is a PC sheet or a PET sheet.

[0015] The battery cell according to the second embodiment of the present invention comprises: a battery housing, comprising a battery cover according to the first embodiment of the present invention; and a pole group disposed in the battery housing.

[0016] According to the battery cell of the embodiment of the utility model, by providing the above-mentioned battery cover plate, the possibility of the pressure relief valve being damaged or opening prematurely due to the impact of the electrolyte on the pressure relief valve can be reduced, thereby extending the service life of the pressure relief valve and the battery cell.

[0017] A battery pack according to an embodiment of the third aspect of the utility model includes: a battery cell according to an embodiment of the second aspect of the utility model.

[0018] According to the battery pack of the embodiment of the utility model, by providing the above-mentioned battery cell, the battery housing of the battery cell includes a battery cover, which can reduce the possibility of the impact of the electrolyte on the pressure relief valve causing damage to the pressure relief valve or premature opening of the pressure relief valve, and can extend the service life of the pressure relief valve, thereby extending the service life of the battery cell and the battery pack.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a partial cross-sectional view of a battery cell according to some embodiments of the present utility model;

[0022] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0023] Figure 3 yes Figure 1 A front view of the battery cover;

[0024] Figure 4 yes Figure 3 Sectional view along line BB;

[0025] Figure 5 yes Figure 4 Enlarged view of point C in the middle;

[0026] Figure 6 yes Figure 3 An exploded view of the battery cover in Figure 1;

[0027] Figure 7 yes Figure 6 A top view of the pressure relief valve in FIG.

[0028] Figure 8 yes Figure 7 Sectional view along line DD;

[0029] Fig. 9 yes Figure 7 Enlarged view of point E in the middle;

[0030] Fig.10 yes Figure 6 A top view of the lower insulating member in FIG.

[0031] Fig.11 yes Figure 6 A three-dimensional schematic diagram of a buffer sheet in FIG.

[0032] Fig.12 yes Figure 6 A top view of the buffer sheet in FIG.

[0033] Fig.13 yes Figure 6 A side view of the buffer sheet in FIG.

[0034] Fig.14 yes Fig.13 Enlarged view of point F in the middle.

[0035] Reference numerals:

[0036] 100. Battery cell;

[0037] 1. Battery cover; 11. Cover body; 111. Valve mounting hole; 112. First connection hole; 12. Pressure relief valve; 121. Valve seat; 122. Valve sheet; 13. Lower insulating member; 131. Exhaust hole; 132. Accommodating groove; 133. Third connection hole; 14. Buffer sheet; 141. Ventilation structure; 142. Sub-ventilation structure; 15. Pressure relief valve patch; 16. Upper insulating member; 161. Second connection hole; 17. Riveting block; 18. Sealing ring;

[0038] 2. Battery case; 21. Electrode group; 22. Electrolyte; 23. Electrode. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] Reference below Figure 1-Figure 14 A battery cover 1 according to an embodiment of the present utility model is described.

[0041] Refer to 3 and Figure 6 According to the battery cover 1 of the first embodiment of the utility model, the battery cover 1 includes a cover body 11, a pressure relief valve 12, a lower insulating member 13 and a buffer sheet 14. A valve mounting hole 111 is formed on the cover body 11, and the pressure relief valve 12 is installed in the valve mounting hole 111. The valve mounting hole 111 can play a role of avoiding the installation of the pressure relief valve 12, so that the pressure relief valve 12 is installed on the cover body 11. For example, the battery cover 1 is used for a battery cell 100. By forming the valve mounting hole 111 on the cover body 11 and installing the pressure relief valve 12, the high-temperature gas inside the battery cell 100 can be discharged in time through the pressure relief valve 12 when the internal and external pressure difference is constant, so as to improve the safety of the battery cell 100.

[0042] When the cover body 11 is applied to the battery cell 100 , the inner side of the cover body 11 refers to the side of the cover body 11 adjacent to the electrode group 21 .

[0043] The lower insulating member 13 is disposed on the inner side of the cover body 11 , and can provide a certain insulation effect between the cover body 11 and the pole group 21 .

[0044] The lower insulating member 13 is formed with an exhaust hole 131 opposite to the pressure relief valve 12, the buffer sheet 14 is located between the cover plate body 11 and the lower insulating member 13 and covers the exhaust hole 131, and a ventilation structure 141 is formed on the buffer sheet 14. The lower insulating member 13 is formed with an exhaust hole 131 opposite to the pressure relief valve 12, so that the high-temperature gas generated by the battery cell 100 can flow to the pressure relief valve 12 through the exhaust hole 131. The buffer sheet 14 is located between the cover plate body 11 and the lower insulating member 13 and covers the exhaust hole 131. The ventilation structure 141 is formed on the buffer sheet 14, which can ensure that when the gas flows through the lower insulating member 13, it can flow to the pressure relief valve 12 through the ventilation structure 141 on the buffer sheet 14.

[0045] The buffer sheet 14 can play a certain role in buffering the impact of the electrolyte 22 on the pressure relief valve 12. For example, when the battery pack shakes back and forth, the back and forth shaking of the electrolyte 22 will continuously impact the pressure relief valve 12, which can easily damage the pressure relief valve 12 and cause the electrolyte 22 to leak through the pressure relief valve 12, or easily cause the pressure relief valve 12 to open prematurely. By covering the vent 131 with the buffer sheet 14, the buffer sheet 14 can play a buffering role for the electrolyte 22 flowing to the pressure relief valve 12 through the vent 131, and can reduce the impact strength caused by the electrolyte 22 directly flowing to the pressure relief valve 12 through the vent 131, thereby extending the service life of the pressure relief valve 12 and reducing the possibility of the electrolyte 22 leaking through the pressure relief valve 12.

[0046] Optionally, according to an embodiment of the utility model, the battery cover 1 may further include a pressure relief valve patch 15, an upper insulating member 16, a rivet block 17 and a sealing ring 18, and the battery cell 100 includes a pole 23. The pressure relief valve patch 15 is arranged on the outer side of the cover body 11 and covers the valve mounting hole 111, which can protect the pressure relief valve 12, thereby extending the service life of the pressure relief valve 12. The rivet block 17 is arranged on the outer side of the cover body 11, and the rivet block 17 is used to fix the pole 23 on the cover body 11. The upper insulating member 16 is arranged on the outer side of the cover body 11 and is located between the rivet block 17 and the cover body 11, and the upper insulating member 16 can play a certain insulating role on the cover body 11 and the rivet block 17.

[0047] The cover body 11 is formed with a first connection hole 112, the upper insulating member 16 is formed with a second connection hole 161, and the lower insulating member 13 is formed with a third connection hole 133. After the pole 23 is sequentially inserted into the third connection hole 133, the first connection hole 112, and the second connection hole 161, the pole 23 and the rivet block 17 are fixedly connected to the cover body 11. The sealing ring 18 is provided on the inner side of the cover body 11 and between the pole 23 and the third connection hole 133, which can enhance the sealing effect between the pole 23 and the third connection hole 133.

[0048] According to the battery cover plate 1 of the embodiment of the utility model, a vent hole 131 opposite to the pressure relief valve 12 is formed on the lower insulating member 13, the vent hole 131 is covered by the buffer sheet 14 and a ventilation structure 141 is formed on the buffer sheet 14, the ventilation structure 141 can make the gas flow channel smooth, thereby ensuring the normal pressure relief of the pressure relief valve 12, and the buffer sheet 14 can buffer the electrolyte 22 flowing to the pressure relief valve 12, which can reduce the impact of the electrolyte 22 on the pressure relief valve 12 and cause the pressure relief valve 12 to be damaged or the possibility of the pressure relief valve 12 opening prematurely, thereby extending the service life of the pressure relief valve 12.

[0049] Reference Figure 4 and Figure 5 According to some embodiments of the present invention, the buffer sheet 14 is fixed to the lower insulating member 13 so that the buffer sheet 14 directly covers the exhaust hole 131 , which can reduce the gap between the buffer sheet 14 and the exhaust hole 131 , thereby improving the buffering effect of the buffer sheet 14 on the pressure relief valve 12 .

[0050] Reference Figure 4 and Figure 5 According to some embodiments of the present invention, the buffer sheet 14 is bonded to the lower insulating member 13, which can make the connection between the buffer sheet 14 and the lower insulating member 13 simple and have strong stability, and can reduce the possibility of the buffer sheet 14 falling off due to a large impact.

[0051] Reference Figure 4 and Figure 5 According to some embodiments of the utility model, a receiving groove 132 is formed on one side of the lower insulating member 13 facing the pressure relief valve 12, a vent hole 131 is formed on the bottom wall of the receiving groove 132, and the buffer sheet 14 is received in the receiving groove 132. The receiving groove 132 can play a role of installation avoidance for the installation of the buffer sheet 14, making it easier for the buffer sheet 14 to be fixed to the lower insulating member 13, and avoiding interference between the buffer sheet 14 and the pressure relief valve 12, so that the overall structure of the lower insulating member 13 and the buffer sheet 14 is compact.

[0052] Reference Figure 5 and Fig.14According to some embodiments of the present invention, the depth w1 of the accommodating groove 132 is greater than the thickness w2 of the buffer sheet 14, so that the buffer sheet 14 can be located in the accommodating groove 132 without exceeding the accommodating groove 132, so that the overall structure of the lower insulating member 13 and the buffer sheet 14 can be compact.

[0053] Reference Fig.10 and Fig.12 According to some embodiments of the present invention, the ventilation structure 141 includes two sub-ventilation structures 142 , which are located at both ends of the buffer sheet 14 in the length direction, and at least part of the sub-ventilation structures 142 is opposite to the exhaust hole 131 . The sub-vent structures 142 located at both ends of the buffer sheet 14 in the length direction can ensure smooth gas flow and make the gas flow through the buffer sheet 14 to the pressure relief valve 12 more uniform, thereby ensuring the normal pressure relief of the pressure relief valve 12, so that the pressure relief valve 12 can be opened in time to discharge the gas when the internal and external air pressure difference is constant; and, compared with the electrolyte 22 directly flowing to the pressure relief valve 12 through the exhaust hole 131 and impacting the pressure relief valve 12, by providing two sub-vent structures 142 at both ends of the buffer sheet 14 in the length direction, at least part of the sub-vent structures 142 is opposite to the exhaust hole 131, which can enhance the buffering effect of the electrolyte 22 flowing to the pressure relief valve 12, and reduce the possibility of the electrolyte 22 impacting the pressure relief valve 12 and causing damage to the pressure relief valve 12 or premature opening of the pressure relief valve 12.

[0054] Among them, at least a part of the sub-ventilation structure 142 being opposite to the exhaust hole 131 may include the following situations: for example, the entire sub-ventilation structure 142 may be opposite to the exhaust hole 131; for another example, a part of the sub-ventilation structure 142 may be opposite to the exhaust hole 131, and another part of the sub-ventilation structure 142 may be staggered with the exhaust hole 131.

[0055] Reference Figure 7 , Figure 8 and Fig.11 According to some embodiments of the utility model, the sub-vent structure 142 is formed as a long strip hole extending along the width direction of the buffer sheet 14, and the extension length of the exhaust hole 131 in the length direction of the cover body 11 is k. The pressure relief valve 12 includes a valve seat 121 and a valve sheet 122. The valve sheet 122 is arranged on the valve seat 121. The valve seat 121 can enhance the overall structural strength of the pressure relief valve 12 and enhance the overall stability of the pressure relief valve 12 and the cover body 11, thereby extending the service life of the pressure relief valve 12. When the internal and external air pressure difference of the pressure relief valve 12 does not reach the set value, the valve sheet 122 cooperates with the valve seat 121 to prevent the gas inside the battery cover 1 from being discharged; when the internal and external air pressure difference of the pressure relief valve 12 reaches the set value, the gas can be discharged to the outside of the battery cover 1 through the pressure relief valve 12.

[0056] The extension length of the valve plate 122 in the length direction of the cover plate body 11 is h, the inner spacing between the two sub-ventilation structures 142 is m, and the outer spacing between the two sub-ventilation structures 142 is n, and k, h, m, and n satisfy: h<m<k<n. The extension length h of the valve plate 122 in the length direction of the cover plate body 11 is less than the inner spacing m between the two sub-ventilation structures 142, which can prevent the electrolyte 22 from directly passing through the two sub-ventilation structures 142 to impact the pressure relief valve 12, and can play a certain buffering role on the pressure relief valve 12; the inner spacing m between the two sub-ventilation structures 142 is less than the extension length k of the exhaust hole 131 in the length direction of the cover plate body 11, and the extension length k of the exhaust hole 131 in the length direction of the cover plate body 11 is less than the outer spacing n between the two sub-ventilation structures 142, which can ensure that at least part of the sub-ventilation structure 142 is opposite to the exhaust hole 131 of the lower insulating member 13, thereby ensuring smooth airflow.

[0057] By making the extension length h of the valve plate 122 in the length direction of the cover plate body 11 smaller than the inner spacing m of the two sub-ventilation structures 142, the inner spacing m of the two sub-ventilation structures 142 smaller than the extension length k of the exhaust hole 131 in the length direction of the cover plate body 11, and the extension length k of the exhaust hole 131 in the length direction of the cover plate body 11 smaller than the outer spacing n of the two sub-ventilation structures 142, it is possible to prevent the electrolyte 22 from directly passing through the two sub-ventilation structures 142 to impact the pressure relief valve 12, which can have a certain buffering effect on the pressure relief valve 12, and can ensure that at least a portion of the sub-ventilation structure 142 is opposite to the exhaust hole 131 of the lower insulating member 13, thereby ensuring smooth airflow.

[0058] Reference Fig.14 According to some embodiments of the present invention, the thickness of the buffer sheet 14 ranges from 0.03 mm to 0.3 mm. For example, the thickness w2 of the buffer sheet 14 can be 0.03 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm, etc. By ensuring that the thickness w2 of the buffer sheet 14 is not less than 0.03 mm, it can be ensured that the strength of the buffer sheet 14 is sufficient to withstand a certain degree of impact; by ensuring that the thickness w2 of the buffer sheet 14 is not greater than 0.3 mm, it can be avoided that the buffer sheet 14 is too thick and affects the gas circulation effect.

[0059] By setting the thickness w2 of the buffer sheet 14 to be in the range of 0.03 mm to 0.3 mm, it can be ensured that the buffer sheet 14 is strong enough to resist a certain degree of impact and the gas circulation effect is not affected by the excessive thickness of the buffer sheet 14 .

[0060] Reference Fig.11According to some embodiments of the present invention, the buffer sheet 14 is a plastic part, and the buffer sheet 14 is a PC sheet or a PET sheet, which can make the buffer sheet 14 softer in texture, can play a buffering role when impacted, and make the buffer sheet 14 corrosion-resistant (for example, impacted by the electrolyte 22), which can extend the service life of the buffer sheet 14.

[0061] Reference Fig.11 and Fig.14 According to some embodiments of the present invention, the thickness of the buffer sheet 14 ranges from 0.03mm to 0.3mm; and the buffer sheet 14 is a plastic part, such as a PC sheet or a PET sheet. By setting the thickness w2 of the buffer sheet 14 to range from 0.03mm to 0.3mm, it can be ensured that the buffer sheet 14 is strong enough to resist a certain degree of impact and avoid affecting the gas circulation effect due to the excessive thickness of the buffer sheet 14; and the buffer sheet 14 can be made softer, which can play a buffering role when impacted and make the buffer sheet 14 corrosion-resistant (for example, impacted by the electrolyte 22), which can extend the service life of the buffer sheet 14.

[0062] Reference Figure 1 and Figure 2 According to the second embodiment of the utility model, the battery cell 100 includes a battery housing 2 and a pole group 21. The battery housing 2 includes the battery cover plate 1 according to the first embodiment of the utility model. The pole group 21 is arranged in the battery housing 2.

[0063] According to the battery cell 100 of the embodiment of the utility model, by providing the above-mentioned battery cover 1, the possibility of the impact of the electrolyte 22 on the pressure relief valve 12 causing damage to the pressure relief valve 12 or premature opening of the pressure relief valve 12 can be reduced, thereby extending the service life of the pressure relief valve 12 and the battery cell 100.

[0064] Reference Figure 1 The battery pack according to the third aspect of the present invention includes the battery cell 100 according to the second aspect of the present invention.

[0065] According to the battery pack of the embodiment of the utility model, by setting the above-mentioned battery cell 100, the battery shell 2 of the battery cell 100 includes the battery cover 1, which can reduce the impact of the electrolyte 22 on the pressure relief valve 12 and cause the pressure relief valve 12 to be damaged or the pressure relief valve 12 to open prematurely. The service life of the pressure relief valve 12 can be extended, thereby extending the service life of the battery cell 100 and the battery pack.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cover, characterized in that: include: A cover plate body, wherein a valve mounting hole is formed on the cover plate body; a pressure relief valve, the pressure relief valve being mounted in the valve mounting hole; a lower insulating member, the lower insulating member being arranged on the inner side of the cover plate body and forming an exhaust hole opposite to the pressure relief valve; A buffer sheet is located between the cover plate body and the lower insulating member and covers the exhaust hole, and a ventilation structure is formed on the buffer sheet.

2. The battery cover according to claim 1, characterized in that: The buffer sheet is fixed to the lower insulating member.

3. The battery cover according to claim 2, characterized in that: The buffer sheet is bonded to the lower insulating member.

4. The battery cover according to claim 2, characterized in that: A receiving groove is formed on one side of the lower insulating member facing the pressure relief valve, the exhaust hole is formed on the bottom wall of the receiving groove, and the buffer sheet is received in the receiving groove.

5. The battery cover according to claim 4, characterized in that: The depth of the accommodating groove is greater than the thickness of the buffer sheet.

6. The battery cover according to claim 1, characterized in that: The ventilation structure includes two sub-ventilation structures, which are located at two ends of the buffer sheet in the length direction, and at least parts of the sub-ventilation structures are opposite to the exhaust holes.

7. The battery cover according to claim 6, characterized in that: The sub-ventilation structure is formed as an elongated hole extending in the width direction of the buffer plate, the exhaust hole extends for a length k in the length direction of the cover plate body, the pressure relief valve comprises a valve seat and a valve plate, the valve plate is arranged on the valve seat, the valve plate extends for a length h in the length direction of the cover plate body, the inner distance between the two sub-ventilation structures is m, the outer distance between the two sub-ventilation structures is n, and k, h, m, and n satisfy: h<m<k<n.

8. The battery cover according to any one of claims 1 to 7, characterized in that: The thickness of the buffer sheet is in the range of 0.03 mm to 0.3 mm; and / or the buffer sheet is a plastic part, and the buffer sheet is a PC sheet or a PET sheet.

9. A battery cell, characterized in that: include: A battery housing, comprising a battery cover according to any one of claims 1 to 8; The electrode group is arranged in the battery casing.

10. A battery pack, characterized in that: include: The battery cell according to claim 9.

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