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 installation hole is formed in the cover plate body, the pressure release valve is installed in the valve installation 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 pieces are located between the cover plate body and the lower insulating part and cover the exhaust hole, ventilation structures are formed on the buffer pieces, and the number of the buffer pieces is two. And the two buffer plates are arranged in the thickness direction of the cover plate body and are oppositely arranged. 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 two buffer plates which are arranged in the thickness direction of the cover plate body and are oppositely arranged can play a role in buffering the electrolyte flowing to the pressure release valve, 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 therefore 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 pack, the electrolyte in the battery pack 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 propose a battery cover, which forms an exhaust hole opposite to the pressure relief valve on the lower insulating member, and 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, so as to ensure the normal pressure relief of the pressure relief valve, and two buffer sheets arranged and relatively arranged along the thickness direction of the cover body 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, a ventilation structure is formed on the buffer sheet, there are two buffer sheets, and the two buffer sheets are arranged along the thickness direction of the cover body and are opposite to each other.

[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 two buffer sheets arranged and relatively set along the thickness direction of the cover plate body 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 utility model, the ventilation structures on the two buffer sheets are staggered; and / or the ventilation structure includes a plurality of ventilation holes, and the plurality of ventilation holes are distributed in a plurality of rows and columns.

[0009] 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.

[0010] According to some embodiments of the present invention, the two buffer sheets are spaced apart in the thickness direction of the cover plate body.

[0011] According to some embodiments of the utility model, the two buffer plates are distributed as a first buffer plate and a second buffer plate, the first buffer plate is fixed to the cover plate body and is located on a side of the pressure relief valve close to the lower insulating member, and the second buffer plate is fixed to the lower insulating member.

[0012] According to some embodiments of the present invention, the first buffer sheet and the pressure relief valve are spaced apart from each other in the thickness direction of the cover plate body.

[0013] According to some embodiments of the present utility model, the distance between the first buffer plate and the pressure relief valve is m, and the value range of m is 0.2 mm to 1 mm.

[0014] According to some embodiments of the utility model, a receiving groove is formed on the 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; the depth of the receiving groove is greater than the thickness of the buffer sheet.

[0015] According to some embodiments of the utility model, a first sunken platform and a second sunken platform are formed on the side of the cover plate body facing the lower insulating member, the first sunken platform surrounds the outer peripheral side of the valve mounting hole, the pressure relief valve is fixed to the first sunken platform, the second sunken platform is located on the side of the first sunken platform close to the lower insulating member and surrounds the outer peripheral side of the first sunken platform, and the first buffer plate is fixed to the side of the second sunken platform away from the pressure relief valve.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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

[0021] 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:

[0022] Figure 1 is a partial cross-sectional view of a battery cell according to some embodiments of the present utility model;

[0023] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0024] Figure 3 This is the front view of the battery cover in 1;

[0025] Figure 4 yes Figure 3 Sectional view along line BB;

[0026] Figure 5 yes Figure 4 Enlarged view of point C in the middle;

[0027] Figure 6 yes Figure 3 An exploded view of the battery cover in Figure 1;

[0028] Figure 7 yes Figure 6A three-dimensional schematic diagram of the lower insulating member in FIG.

[0029] Figure 8 yes Figure 6 A three-dimensional schematic diagram of a pressure relief valve in FIG.

[0030] Fig. 9 yes Figure 6 A top view of the first buffer sheet in;

[0031] Fig.10 yes Figure 6 A top view of the second buffer sheet in;

[0032] Fig.11 yes Figure 6 A side view of the buffer sheet in FIG.

[0033] Fig.12 yes Fig.11 Enlarged view of point D in the middle.

[0034] Reference numerals:

[0035] 100. Battery cell;

[0036] 1. Battery cover; 11. Cover body; 111. Valve mounting hole; 112. First sink; 113. Second sink; 114. Second connection hole; 12. Pressure relief valve; 13. Lower insulating member; 131. Exhaust hole; 132. Accommodating groove; 133. First connection hole; 14. Buffer sheet; 141. First buffer sheet; 142. Second buffer sheet; 143. Ventilation structure; 144. Ventilation hole; 15. Pressure relief valve patch; 16. Upper plastic; 161. Third connection hole; 17. Riveting block; 18. Sealing ring; 2. Battery case; 21. Pole group; 22. Electrolyte; 23. Pole column. DETAILED DESCRIPTION

[0037] 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.

[0038] Reference below Figure 1-Figure 12 A battery cover 1 according to an embodiment of the present utility model is described.

[0039] Reference Figure 5 and Figure 6According 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 mounted in the valve mounting hole 111. The valve mounting hole 111 plays a role of avoiding the installation of the pressure relief valve 12, which facilitates the installation of the pressure relief valve 12 on the cover body 11. For example, the battery cover 1 is applied to 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, thereby improving the safety of the battery cell 100.

[0040] 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 .

[0041] 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 .

[0042] The lower insulating member 13 is formed with an exhaust hole 131 opposite to the pressure relief valve 12, and the buffer sheet 14 is located between the cover body 11 and the lower insulating member 13 and covers the exhaust hole 131. A ventilation structure 143 is formed on the buffer sheet 14. There are two buffer sheets 14, and the two buffer sheets 14 are arranged along the thickness direction of the cover body 11 and are arranged opposite to each other. 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 body 11 and the lower insulating member 13 and covers the exhaust hole 131. A ventilation structure 143 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 143 on the buffer sheet 14.

[0043] The buffer sheet 14 can play a certain role in buffering the impact of the electrolyte 22 on the pressure relief valve 12, and the two buffer sheets 14 arranged and arranged opposite to each other along the thickness direction of the cover body 11 can enhance the buffering effect of 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.

[0044] The exhaust hole 131 is covered by a buffer sheet 14 and there are two buffer sheets 14, which are arranged along the thickness direction of the cover plate body 11 and are relatively set. The buffer sheet 14 can buffer the electrolyte 22 flowing to the pressure relief valve 12 through the exhaust hole 131, and can reduce the impact strength caused by the electrolyte 22 directly flowing to the pressure relief valve 12 through the exhaust hole 131, thereby extending the service life of the pressure relief valve 12 and reducing the possibility of leakage of the electrolyte 22 through the pressure relief valve 12.

[0045] Optionally, according to an embodiment of the utility model, the battery cover 1 may further include a pressure relief valve patch 15, an upper plastic 16, a rivet block 17 and a sealing ring 18. 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 plastic 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. The upper plastic 16 can play a certain insulating role on the cover body 11 and the rivet block 17. The sealing ring 18 is arranged on the inner side of the cover body 11 and is located between the pole 23 and the first connection hole 133, which can enhance the sealing effect between the pole 23 and the first connection hole 133.

[0046] The lower insulating member 13 is formed with a first connection hole 133, the cover body 11 is formed with a second connection hole 114, and the upper plastic 16 is formed with a third connection hole 161. When the battery cover 1 is applied to the battery cell 100, the pole 23 can be sequentially inserted into the first connection hole 133, the second connection hole 114 and the third connection hole 161. By connecting the pole 23 to the rivet block 17, the pole 23 can be fixed to the cover body 11.

[0047] 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 a buffer sheet 14 and a ventilation structure 143 is formed on the buffer sheet 14, the ventilation structure 143 can make the gas flow channel smooth, thereby ensuring the normal pressure relief of the pressure relief valve 12, and the two buffer sheets 14 arranged and relatively set along the thickness direction of the cover plate body 11 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.

[0048] Reference Figure 6According to some embodiments of the present invention, the ventilation structures 143 on the two buffer sheets 14 are staggered, which can enhance the buffering effect on the electrolyte 22 flowing toward 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.

[0049] Reference Fig. 9 and Fig.10 According to some embodiments of the present invention, the ventilation structure 143 includes a plurality of ventilation holes 144, and the plurality of ventilation holes 144 are arranged in a plurality of rows and columns. The plurality of ventilation holes 144 arranged in a plurality of rows and columns can ensure smooth flow of air and make the gas flowing through the buffer sheet 14 to the pressure relief valve 12 flow more evenly, thereby ensuring 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 pressure difference between the inside and outside is constant.

[0050] Reference Figure 6 , Fig. 9 and Fig.10 According to some embodiments of the utility model, the ventilation structures 143 on the two buffer sheets 14 are staggered; and the ventilation structure 143 includes a plurality of ventilation holes 144, and the plurality of ventilation holes 144 are arranged in multiple rows and columns, which can enhance the buffering effect on the electrolyte 22 flowing to the pressure relief valve 12, and can reduce the possibility that the pressure relief valve 12 is damaged or the pressure relief valve 12 is opened prematurely due to the impact of the electrolyte 22 on the pressure relief valve 12; and the plurality of ventilation holes 144 arranged in multiple rows and columns can ensure smooth flow of air and can make the gas flowing through the buffer sheet 14 to the pressure relief valve 12 flow more evenly, 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.

[0051] Reference Fig.11 and Fig.12 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 w1 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 w1 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 w1 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.

[0052] By setting the thickness w1 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 has sufficient strength to resist a certain degree of impact and the gas circulation effect is not affected by the buffer sheet 14 being too thick.

[0053] Reference Fig.11 and Fig.12 According 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.

[0054] Reference Fig.11 and Fig.12 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 making the thickness w1 of the buffer sheet 14 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 buffer sheet 14 being too thick; and the buffer sheet 14 being a PC sheet or a PET sheet can make the buffer sheet 14 softer, 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.

[0055] Reference Figure 5 and Figure 6 According to some embodiments of the utility model, two buffer sheets 14 are spaced apart in the thickness direction of the cover body 11. When the electrolyte 22 flows toward the pressure relief valve 12, the buffer sheet 14 contacts the electrolyte 22. Since the two buffer sheets 14 are spaced apart in the thickness direction of the cover body 11, the electrolyte 22 contacts the two buffer sheets 14 in sequence when flowing toward the pressure relief valve 12, which can enhance the buffering effect of the electrolyte 22 flowing toward the pressure relief valve 12.

[0056] Reference Figure 5 and Figure 6 According to some embodiments of the utility model, the two buffer sheets 14 are distributed as a first buffer sheet 141 and a second buffer sheet 142. The first buffer sheet 141 is fixed to the cover body 11 and is located on the side of the pressure relief valve 12 close to the lower insulating member 13, and the second buffer sheet 142 is fixed to the lower insulating member 13. The first buffer sheet 141 is fixed to the cover body 11 and is located on the side of the pressure relief valve 12 close to the lower insulating member 13, and can play a buffering role for the electrolyte 22 flowing to the pressure relief valve 12; the second buffer sheet 142 is fixed to the lower insulating member 13, and can play a buffering role for the electrolyte 22 flowing to the pressure relief valve 12 through the lower insulating member 13.

[0057] By arranging the first buffer sheet 141 and the second buffer sheet 142 at intervals in the thickness direction of the cover plate body 11, the buffering effect on the electrolyte 22 flowing toward the pressure relief valve 12 can be greatly improved, and the possibility of the pressure relief valve 12 being damaged or the pressure relief valve 12 being opened prematurely due to the impact of the electrolyte 22 on the pressure relief valve 12 can be reduced, thereby extending the service life of the pressure relief valve 12.

[0058] For example, the first buffer sheet 141 is adhesively fixed to the cover body 11, and the second buffer sheet 142 is adhesively fixed to the lower insulating member 13. This can make the connection between the first buffer sheet 141 and the cover body 11, and between the second buffer sheet 142 and the lower insulating member 13 simple and have strong stability, and can reduce the possibility of the first buffer sheet 141 and the second buffer sheet 142 falling off due to a large impact.

[0059] Reference Figure 5 According to some embodiments of the utility model, the first buffer sheet 141 and the pressure relief valve 12 are spaced apart in the thickness direction of the cover plate body 11, so that a certain distance is formed between the first buffer sheet 141 and the pressure relief valve 12. When the electrolyte 22 flows toward the pressure relief valve 12, the first buffer sheet 141 contacts the electrolyte 22 and has a buffering effect on the electrolyte 22. Since the first buffer sheet 141 and the pressure relief valve 12 are spaced apart in the thickness direction of the cover plate body 11, the electrolyte 22 first contacts the first buffer sheet 141 in the process of flowing toward the pressure relief valve 12. When the first buffer sheet 141 plays a buffering role on the electrolyte 22, it will not interfere with the pressure relief valve 12, thereby reducing the possibility that the pressure relief valve 12 is misjudged and opened in advance due to the interference between the first buffer sheet 141 and the pressure relief valve 12, and improving the buffering effect on the electrolyte 22 flowing toward the pressure relief valve 12.

[0060] Reference Figure 5 According to some embodiments of the present invention, the distance between the first buffer sheet 141 and the pressure relief valve 12 is m, and the value range of m is 0.2 mm to 1 mm. For example, the distance m between the first buffer sheet 141 and the pressure relief valve 12 can be 0.2 mm, 0.25 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1 mm, etc.

[0061] By ensuring that the spacing between the first buffer sheet 141 and the pressure relief valve 12 is not less than 0.2 mm, it is possible to avoid interference between the first buffer sheet 141 and the pressure relief valve 12 when the first buffer sheet 141 plays a buffering role on the electrolyte 22, thereby reducing the possibility that the pressure relief valve 12 will misjudge and open prematurely due to interference between the first buffer sheet 141 and the pressure relief valve 12, thereby improving the buffering effect on the electrolyte 22 flowing to the pressure relief valve 12; by ensuring that the spacing between the first buffer sheet 141 and the pressure relief valve 12 is not greater than 1 mm, it is possible to avoid that the spacing between the first buffer sheet 141 and the pressure relief valve 12 is too large to weaken the buffering effect of the first buffer sheet 141 on the electrolyte 22.

[0062] By setting the spacing m between the first buffer sheets 141 to a value in the range of 0.2 mm to 1 mm, it is possible to avoid interference between the first buffer sheet 141 and the pressure relief valve 12 when the first buffer sheet 141 buffers the electrolyte 22, thereby reducing the possibility of the pressure relief valve 12 opening prematurely due to misjudgment caused by the interference between the first buffer sheet 141 and the pressure relief valve 12, thereby improving the buffering effect on the electrolyte 22 flowing toward the pressure relief valve 12; and it is possible to avoid the spacing between the first buffer sheet 141 and the pressure relief valve 12 being too large, thereby preventing the buffering effect of the first buffer sheet 141 on the electrolyte 22 from being weakened.

[0063] Reference Figure 5 and Figure 6 According to some embodiments of the utility model, a receiving groove 132 is formed on the side of the lower insulating member 13 facing the pressure relief valve 12, and a vent hole 131 is formed on the bottom wall of the receiving groove 132. The buffer sheet 14 is received in the receiving groove 132. The receiving groove 132 can serve as an installation avoidance for the buffer sheet 14, making it convenient 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, thereby making the overall structure of the lower insulating member 13 and the buffer sheet 14 compact.

[0064] Furthermore, the depth w2 of the accommodating groove 132 is greater than the thickness w1 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 , and the overall structure of the lower insulating member 13 and the buffer sheet 14 can be compact.

[0065] Reference Figure 5According to some embodiments of the utility model, a first sinker 112 and a second sinker 113 are formed on the side of the cover body 11 facing the lower insulating member 13, the first sinker 112 surrounds the outer peripheral side of the valve mounting hole 111, the pressure relief valve 12 is fixed to the first sinker 112, the second sinker 113 is located on the side of the first sinker 112 close to the lower insulating member 13 and surrounds the outer peripheral side of the first sinker 112, and the first buffer plate 141 is fixed to the side of the second sinker 113 away from the pressure relief valve 12. The first sinker 112 can serve as an installation avoidance for the installation of the pressure relief valve 12, and the second sinker 113 can serve as an installation avoidance for the installation of the first buffer sheet 141, so that the pressure relief valve 12 and the first buffer sheet 141 are fixed to the cover body 11, thereby making the overall structure of the pressure relief valve 12, the first buffer sheet 141 and the cover body 11 compact; and the first buffer sheet 141 is fixed to the side of the second sinker 113 away from the pressure relief valve 12, which can ensure that there is a certain distance between the first buffer sheet 141 and the pressure relief valve 12, and can avoid interference between the pressure relief valve 12 and the first buffer sheet 141.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 a battery cover 1, which can reduce 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, and can extend the service life of the pressure relief valve 12, thereby extending the service life of the battery cell 100 and the battery pack.

[0070] 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.

[0071] 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 body and the lower insulating member and covers the exhaust hole. A ventilation structure is formed on the buffer sheet. There are two buffer sheets, which are arranged along the thickness direction of the cover body and are disposed opposite to each other.

2. The battery cover according to claim 1, characterized in that: The ventilation structures on the two buffer sheets are staggered; and / or the ventilation structure comprises a plurality of ventilation holes, and the plurality of ventilation holes are distributed in a plurality of rows and columns.

3. The battery cover according to claim 2, 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.

4. The battery cover according to claim 1, characterized in that: The two buffer sheets are arranged spaced apart in the thickness direction of the cover plate body.

5. The battery cover according to any one of claims 1 to 4, characterized in that: The two buffer sheets are divided into a first buffer sheet and a second buffer sheet. The first buffer sheet is fixed to the cover plate body and is located on a side of the pressure relief valve close to the lower insulating member. The second buffer sheet is fixed to the lower insulating member.

6. The battery cover according to claim 5, characterized in that: The first buffer sheet and the pressure relief valve are spaced apart in the thickness direction of the cover plate body; the distance between the first buffer sheet and the pressure relief valve is m, and the value range of m is 0.2 mm to 1 mm.

7. The battery cover according to claim 5, 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; the depth of the receiving groove is greater than the thickness of the buffer sheet.

8. The battery cover according to claim 5, characterized in that: A first sunken platform and a second sunken platform are formed on one side of the cover body facing the lower insulating member, the first sunken platform surrounds the outer peripheral side of the valve mounting hole, the pressure relief valve is fixed to the first sunken platform, the second sunken platform is located on the side of the first sunken platform close to the lower insulating member and surrounds the outer peripheral side of the first sunken platform, and the first buffer plate is fixed to the side of the second sunken platform away from the pressure relief valve.

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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