CN217655973U

CN217655973U - Battery cover plate, battery and electric equipment

Info

Publication number: CN217655973U
Application number: CN202221673577.5U
Authority: CN
Inventors: 崔红艳
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-10-25
Anticipated expiration: 2032-06-29

Abstract

The utility model discloses a battery apron, battery and consumer, the battery apron includes: the cover plate body is provided with a pole column, an explosion-proof valve and a liquid injection hole; the lower plastic is arranged below the cover plate body and comprises a first groove and a second groove, at least part of the first groove is arranged under the liquid injection hole, at least part of the second groove is arranged under the explosion-proof valve, a plurality of liquid discharge holes are formed in the side wall of the first groove, and the bottom wall of the first groove is not provided with the liquid discharge holes. The utility model discloses avoided the outage that sets up on the notes liquid hole that sets up on the apron body and the plastic down to form the through-hole, avoided electrolyte directly to get into utmost point group by the through-hole and lead to the diaphragm and the pole piece of liquid pressure direct-flushing utmost point group, the diaphragm that causes utmost point group and the damaged problem of pole piece and electric core short circuit problem to the security performance and the life of battery have further been improved.

Description

Battery cover plate, battery and electric equipment

Technical Field

The utility model relates to a battery technology field, particularly, the utility model relates to a battery apron, battery and consumer.

Background

With the development of electric vehicles and the promotion of policies, the demand of the market for batteries is more and more. In recent years, each battery factory has continuous production expansion, meets the market demand and occupies the market. The power battery occupies most of the cost of the electric automobile, and with the increase of the demand, the cost of the battery is more and more emphasized by enterprises, and the cost reduction is continuously carried out.

The battery includes a battery apron usually, and the liquid mode is annotated to the notes liquid hole that electrolyte set up through the apron on, generally adopts the malleation to annotate the liquid, generally sets up the outage on the diapire of annotating the lower plastic that the liquid hole corresponds among the prior art, from this outage with annotate liquid hole formation through-hole, this through-hole can lead to annotating liquid pressure and directly dashing pole piece and the diaphragm of utmost point group, cause the pole piece and the diaphragm damage of utmost point group, lead to electric core to have the short circuit risk.

In addition, in prior art, the speed that the gas that produces when electric core takes place thermal runaway reaches explosion-proof valve department through lower plastic is slower, and the exhaust time is longer to the risk that heat spreads has been increased.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model aims at providing a battery apron, battery and consumer. The utility model discloses avoided the outage that sets up on the notes liquid hole that sets up on the apron body and the plastic down to form the through-hole, avoided electrolyte directly to get into utmost point group by the through-hole and lead to the diaphragm and the pole piece of liquid pressure direct-flushing utmost point group, the diaphragm that causes utmost point group and the damaged problem of pole piece and electric core short circuit problem to the security performance and the life of battery have further been improved.

In one aspect of the present invention, a battery cover plate is provided. According to the utility model discloses an embodiment, the battery apron includes:

the cover plate body is provided with a pole, an explosion-proof valve and a liquid injection hole;

the lower plastic is arranged below the cover plate body and comprises a first groove and a second groove, at least part of the first groove is arranged under the liquid injection hole, at least part of the second groove is arranged under the explosion-proof valve, a plurality of liquid discharge holes are formed in the side wall of the first groove, and the bottom wall of the first groove is not provided with the liquid discharge holes.

According to the utility model discloses battery apron of above-mentioned embodiment, set up the outage on the lateral wall of first recess, and do not set up the outage on the diapire of first recess, get into the electrolyte in the first recess by annotating the liquid hole and discharge from the lateral wall of first recess and get into utmost point group, the outage that has avoided setting up on the apron body from this forms the through-hole with the down on the plastic, avoided electrolyte directly to get into utmost point group by the through-hole and lead to annotating liquid pressure direct impact utmost point group's diaphragm and pole piece, cause the problem and the electric core short circuit problem of the diaphragm of utmost point group and pole piece damage, thereby the security performance and the life of battery have further been improved.

In addition, the battery cover plate according to the above embodiment of the present invention may also have the following additional technical features:

in some embodiments of the present invention, the aperture of the drain hole is 2-5mm.

In some embodiments of the present invention, the distance between adjacent drain holes is 1-5mm.

In some embodiments of the present invention, the bottom wall of the second groove is provided with a plurality of exhaust holes, and the total area of the plurality of exhaust holes is 7% -30% of the area of the bottom wall of the second groove.

In some embodiments of the present invention, the diameter of the vent hole is 2-5mm.

In some embodiments of the present invention, the distance between adjacent exhaust holes is 1-5mm.

In some embodiments of the present invention, the distance between the explosion-proof valve and the pole is 4-18mm, the distance between the explosion-proof valve and the liquid injection hole is 2-4mm, and the distance between the edge of the explosion-proof valve and the side edge of the cover plate body is 4-6mm.

In some embodiments of the present invention, the first groove communicates with the second groove.

In a second aspect of the present invention, a battery is provided. According to the utility model discloses an embodiment, the battery has the battery apron of above embodiment, the thickness of battery is 10-50mm, the width of battery is 90-120mm, the length of battery is 200-600mm, the ratio of length with thickness is 12-60. Therefore, the safety performance and the service life of the battery are further improved. Meanwhile, the long thin battery is beneficial to improving the heat dissipation performance, the manufacturing efficiency and the module forming efficiency of the battery.

In a third aspect of the present invention, an electric device is provided. According to the utility model discloses an embodiment, consumer has the battery of above embodiment. Therefore, the electric equipment loaded with the battery with excellent safety performance and service life also has excellent safety performance and service life, so that the use requirements of consumers are further met.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a cross-sectional view of a battery cover plate according to an embodiment of the present invention;

fig. 2 is a front view of a battery cover plate according to an embodiment of the present invention;

fig. 3 is a bottom view of a battery cover plate according to an embodiment of the present invention;

fig. 4 is an elevation view of a pole set tab and cover plate weld according to an embodiment of the present invention;

fig. 5 is a front view of an L-shaped lithium ion battery cell according to an embodiment of the present invention.

The attached drawings are marked as follows:

100-cover plate body, 200-lower plastic, 300-pole, 400-explosion-proof valve, 500-liquid injection hole, 210-first groove, 220-second groove, 211-liquid discharge hole, 221-exhaust hole, 1000-positive cover plate, 2000-negative cover plate, 3000-pole group, 3001-positive pole tab and 3002-negative pole tab.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In one aspect of the present invention, a battery cover plate is provided. According to the embodiment of the present invention, referring to fig. 1-3, the battery cover plate comprises: a cover plate body 100, wherein the cover plate body 100 is provided with a pole 300, an explosion-proof valve 400 and a liquid injection hole 500; and a lower plastic 200, wherein the lower plastic 200 is disposed below the cover plate body 100, the lower plastic 200 includes a first groove 210 and a second groove 220, the first groove 210 is at least partially disposed right below the liquid injection hole 500, the second groove 220 is at least partially disposed right below the explosion-proof valve 400, a plurality of liquid discharge holes 211 are disposed on a sidewall of the first groove 210, and the bottom wall of the first groove 210 is not disposed with the liquid discharge holes 211. From this, set up outage 211 on the lateral wall of first recess 210, and not set up outage 211 on the diapire of first recess 210, get into the electrolyte in first recess 210 by annotating liquid hole 500 and discharge from the lateral wall of first recess 210 and get into utmost point group, the outage 211 that has avoided setting up on the apron body 100 on notes liquid hole 500 and the lower plastic 200 forms the through-hole from this, avoided electrolyte directly to get into utmost point group by the through-hole and lead to annotating the diaphragm and the pole piece of liquid pressure direct-flushing utmost point group, cause the diaphragm of utmost point group and the damaged problem of pole piece and electric core short circuit problem, thereby the security performance and the life of battery have further been improved. The battery cover plate according to the embodiment of the present invention is further described in detail below.

Generally adopt among the prior art the mode of malleation notes liquid to pour into the electric core through notes liquid hole 500 that sets up on the apron with electrolyte, if set up outage 211 on the diapire of annotating the lower plastic 200 that liquid hole 500 corresponds, then this outage 211 will with annotate and form the through-hole between the liquid hole 500, electrolyte is by this through-hole direct rush-in electric core, can cause notes liquid pressure direct rush-in utmost point group's pole piece and diaphragm from this to cause the pole piece and the diaphragm damage of utmost point group, lead to the electric core to have the short circuit risk. In order to solve the technical problem, the utility model discloses a set up outage 211 on the lateral wall of first recess 210, and do not set up outage 211 on the diapire of first recess 210, the outage 211 that gets into in the first recess 210 through first recess 210 lateral wall by annotating the electrolyte of liquid hole 500 from this gets into utmost point group, the outage 211 that has avoided setting up on the apron body 100 annotates liquid hole 500 and down plastic 200 on sets up forms the through-hole, avoided electrolyte directly to get into utmost point group by the through-hole and lead to annotating liquid pressure direct-flushing utmost point group's diaphragm and pole piece, cause the damaged problem of diaphragm and the pole piece of utmost point group and electric core short circuit problem, thereby the security performance and the life of battery have further been improved.

Specifically, the terminal 300 is connected to a tab of the electrode assembly, and the terminal 300 penetrates through the lower plastic 200. The lower plastic 200 serves to insulate the electrode assembly from the cover plate. The injection hole 500 is used to inject electrolyte into the cell through the injection hole 500. The function of the explosion-proof valve 400 is that a large amount of gas generated when the battery core is out of control due to heat is discharged through the explosion-proof valve 400, so that explosion is avoided. In addition, the battery cover plate also comprises common components such as plastic and the like, and the content of the common components belongs to the prior art in the field, and the common components are not described again.

According to some embodiments of the present invention, the aperture of the liquid discharging hole 211 is 2-5mm, for example 2/3/4/5mm, so that the liquid discharging efficiency of the liquid discharging hole 211 is effectively ensured, and the supporting performance and the insulating effect of the lower plastic 200 are also ensured. Particularly, if the aperture of outage 211 is undersized, can't guarantee the flowing back efficiency of outage 211 to the liquid time of annotating has been prolonged, if the aperture of outage 211 is too big, then can't effectively guarantee down the support performance of plastic 200, thereby there is the risk that lower plastic 200 mechanical reliability reduces thereby to lead to lower plastic 200's insulating properties to become invalid.

According to some embodiments of the present invention, the distance between the adjacent liquid discharge holes 211 is 1-5mm, for example, 1/2/3/4/5mm, so that the liquid discharge efficiency of the liquid discharge holes 211 is effectively ensured, and the support performance of the lower plastic 200 is also ensured. Specifically, if the distance between the adjacent liquid discharge holes 211 is too large, the liquid discharge efficiency of the liquid discharge holes 211 cannot be ensured, and if the distance between the adjacent liquid discharge holes 211 is too small, the support performance of the lower plastic 200 cannot be effectively ensured, so that there is a risk that the mechanical reliability of the lower plastic 200 is reduced, which results in the insulation performance of the lower plastic 200 being disabled.

In the embodiment of the present invention, a plurality of exhaust holes 221 are formed on the bottom wall of the second groove 220, so that the gas generated by the battery cell when thermal runaway can rapidly reach the explosion-proof valve 400 through the exhaust holes 221. Further, the total area of the plurality of exhaust holes 221 may be 7% to 30% of the area of the bottom wall of the second groove 220, for example, 7%, 10%, 15%, 20%, 25%, 30%, and the like, thereby ensuring that the exhaust holes 221 have a sufficient area, further enabling gas generated when the battery cell is out of control due to heat to rapidly pass through the lower plastic 200 to reach the explosion-proof valve 400, shortening the exhaust time, and reducing the risk of heat spreading.

Specifically, the specific shape of the above-described air discharge hole 221 is not particularly limited, and is, for example, circular, elliptical, rectangular, etc., preferably circular. Likewise, the specific shape of the drain hole 211 is not particularly limited, and is, for example, circular, elliptical, rectangular, or the like, preferably circular.

According to other embodiments of the present invention, the diameter of the exhaust hole 221 may be 2-5mm, for example, 2/3/4/5mm, thereby effectively ensuring the exhaust efficiency of the exhaust hole 221 and the insulation effect of the lower plastic 200. Specifically, if the aperture of the exhaust hole 221 is too small, the exhaust efficiency of the exhaust hole 221 cannot be ensured, and if the aperture of the exhaust hole 221 is too large, the insulation effect of the lower plastic 200 cannot be effectively ensured.

According to other embodiments of the present invention, the distance between adjacent exhaust holes 221 is 1-5mm, such as 1/2/3/4/5mm, thereby effectively ensuring the exhaust efficiency of the exhaust holes 221 and the support performance of the lower plastic 200. Specifically, if the distance between the adjacent exhaust holes 221 is too large, the exhaust efficiency of the exhaust holes 221 cannot be ensured, and if the distance between the adjacent exhaust holes 221 is too small, the support performance of the lower plastic 200 cannot be effectively ensured, so that there is a risk that the mechanical reliability of the lower plastic 200 is reduced, which may cause the insulation performance of the lower plastic 200 to fail.

According to further embodiments of the present invention, referring to fig. 1, the first groove 210 is communicated with the second groove 220, so that the gas generated when the thermal runaway of the battery cell occurs can reach the explosion-proof valve 400 through the liquid discharge hole 211.

In the embodiment of the present invention, the distance between the edge of the anti-explosion valve 400 and the side of the cover plate body 100 may be 4-6mm, for example, 4/5/6mm, so as to ensure the process yield and the welding reliability of the battery cover plate, and particularly, if the anti-explosion valve 400 is too close to the edge of the cover plate body 100, in the process of peripheral welding, the welding temperature is high, which results in the thermal melting of the anti-explosion valve 400, thereby resulting in the unqualified welding airtightness or causing the battery vibration and other problems.

In the embodiment of the present invention, the distance between the explosion-proof valve 400 and the pole 300 may be 4-18mm, for example, 4/6/8/10/12/14/16/18mm, if the distance is too large, the effective area of the cover plate may be wasted, and the area of the explosion-proof valve 400 is indirectly reduced, thereby affecting the exhaust rate in the thermal runaway process.

In the embodiment of the present invention, the distance between the anti-explosion valve 400 and the liquid injection hole 500 is 2-4mm, for example, 2/3/4mm, if the distance is too small, the liquid injection tool will press the anti-explosion valve 400, and there is a risk that the anti-explosion valve 400 will be broken; if the distance is too large, the area of the explosion-proof valve 400 is indirectly reduced, thereby affecting the exhaust rate during thermal runaway.

The battery cover plate also has the following advantages:

firstly, the weight of the battery cover plate is reduced by 1-2%, so that the energy density of the battery is further improved; secondly, the structural member material cost of the battery cover plate is low, so that the manufacturing cost of the battery is further reduced; thirdly, the exhaust rate of the battery cover plate is improved, thereby further improving the safety performance of the battery.

In a second aspect of the present invention, a battery is provided. According to the utility model discloses an embodiment, above-mentioned battery has the above-mentioned battery cover plate of above embodiment. Therefore, the safety performance and the service life of the battery are further improved.

The battery is a battery cell. Specifically, the battery is an L-shaped lithium ion battery cell, and the overall structure of the battery is shown in fig. 5. Referring to fig. 4, the L-type lithium ion battery cell includes a positive electrode cover plate 1000, a pole group 3000 and a negative electrode cover plate 2000, wherein the pole group 3000 includes a positive electrode sheet, a separator and a negative electrode sheet wound in sequence. The lugs are in a dispersed state, and in order to facilitate the operation of the next procedure and protect the lugs from being damaged by tools and other edge tools, the lugs are pre-welded in a butt-electrode earphone type mode, so that the lugs are in a fixed or bound state. Referring to fig. 4, the positive electrode tab 3001 and the positive electrode post disposed on the positive electrode cover plate are directly laser welded, and the use of a connecting piece is eliminated; in a similar way, the negative pole tab 3002 and the negative pole column arranged on the negative pole cover plate are directly subjected to laser welding, and the use of a connecting sheet is eliminated.

The embodiment of the present invention provides a battery cover plate, which can be set to the above embodiment by the positive cover plate of the above L-type lithium ion battery cell, and can also be set to the above embodiment by the negative cover plate of the above L-type lithium ion battery cell, and can also be set to the above embodiment by the positive cover plate and the negative cover plate of the above L-type lithium ion battery cell.

As a preferable mode, the negative electrode cover plate of the L-shaped lithium ion battery cell is configured as the battery cover plate described in the above embodiment, and the positive electrode cover plate is a conventional cover plate. Specifically, the negative electrode cover plate comprises a negative electrode cover plate body and negative electrode lower plastic, and a negative electrode post, a negative electrode explosion-proof valve and a liquid injection hole are arranged on the negative electrode cover plate. The positive cover plate comprises a positive cover plate body and positive lower plastic, and a positive pole column and a positive explosion-proof valve are arranged on the positive cover plate. That is to say, set up explosion-proof valve respectively on the positive negative pole apron of above-mentioned L type lithium ion cell, two explosion-proof valve settings promptly, this two explosion-proof valve settings are favorable to when the battery takes place the thermal runaway, and the risk that can be quick is spread to the reduction heat.

Specifically, the L-shaped lithium ion battery cell mainly comprises an aluminum shell, an anode cover plate, a cathode cover plate, a bare cell insulation sheet, a pole group, electrolyte and the like. Wherein, the aluminum shell adopts conventional materials, such as Al-3003 alloy number. The thickness of the aluminium envelope is preferably 0.35mm to 0.6mm, more preferably 0.5mm. The positive cover plate mainly comprises a positive smooth aluminum sheet (namely a positive cover plate body) and positive lower plastic. The thickness of the anode polished aluminum sheet is 1.0mm-2.0mm, preferably 1.5mm. The height of the plastic under the anode is 4.5mm-7.5mm, preferably 6mm. The negative electrode cover plate mainly comprises a negative electrode aluminum flake (namely a negative electrode cover plate body) and negative electrode lower plastic. The thickness of the aluminum sheet with the negative electrode light is 1.0mm-2.0mm, and preferably 1.5mm. The height of the plastic under the negative electrode is 4.5mm-7.5mm, preferably 6mm. Naked electric core insulating piece adopts the PP material.

Specifically, the electrode group mainly comprises a positive electrode plate, a negative electrode plate and a diaphragm. Wherein, the positive plate comprises a positive dressing layer and an aluminum foil. The thickness of the aluminum foil is 10um-13um, preferably 10um. The positive electrode dressing layer includes a positive electrode active material, a conductive agent, and a binder. Wherein the mass content of the positive electrode active material is 95-98%, preferably 97%. The mass content of the conductive agent is 1-3%, preferably 1.8%. The mass content of the binder is 1% to 4%, preferably 1.2%. The positive active material adopts a nickel-cobalt-manganese ternary material, wherein the mass content of nickel is 85-95%, and the optimal mass content is 90%; the mass content of cobalt is 2.5-7.5%, preferably 5%; the manganese content is 2.5-7.5% by mass, preferably 5% by mass. The conductive agent is conventional SP, CNT, VGCF, graphene, or the like. The binder is conventional PVDF or the like.

Specifically, the negative electrode sheet includes a negative electrode dressing layer and a copper foil. Wherein, the thickness of copper foil is 4um-8um, preferred 6um. The negative electrode coating layer includes a negative electrode active material, a conductive agent, a thickener, and a binder. Wherein the negative active material includes artificial graphite and a silicon-based material. The mass proportion of the artificial graphite is 85-95%, preferably 91%; the proportion by mass of the silicon-based material is 4 to 12%, preferably 6%. The mass ratio of the conductive agent is 0.5-1.4%, preferably 1%. The mass proportion of the thickener is 0.2-0.8%, preferably 0.5%. The mass proportion of the binder is 1.5-2.5%, preferably 1.5%. Wherein the thickening agent adopts conventional sodium carboxymethyl cellulose, lithium carboxymethyl cellulose and the like. The conductive agent is conventional SP, CNT, VGCF, graphene, or the like. The binder adopts conventional polyacrylic acid, polyacrylonitrile, styrene butadiene rubber and the like.

Specifically, the separator is mainly composed of a PE base film, a ceramic coating layer, and a PVDF coating layer. Wherein the thickness of the PE basal membrane is 7um-11um; the thickness of the ceramic coating is 1um-3um; the thickness of the PVDF coating is 1um to 3um.

Specifically, the electrolyte includes a solvent, a lithium salt, and an additive. Wherein the solvent consists of two or three of EC/DEC/DMC/EMC. The lithium salt is selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium dioxalate borate and lithium bis fluorosulfonylimide. The additive mainly comprises a positive electrode film forming additive, a negative electrode film forming additive and the like.

In the embodiment of the present invention, referring to fig. 5, the thickness of the L-shaped lithium ion battery cell is 10-50mm, and the width of the battery cell is 90-120mm; the length of the battery core is 200-600mm, and the ratio of the length to the thickness is 12-60. Therefore, the long thin battery is beneficial to improving the heat radiation performance, the manufacturing efficiency and the module forming efficiency of the battery.

Therefore, the L-shaped lithium ion battery cell has the following advantages: (1) The lithium ion cell cancels the connecting sheet, reduces the assembly flow of the lithium ion cell, shortens the manufacturing time and reduces the equipment investment cost; (2) The lithium ion battery cell has high energy density and excellent cycle performance; (3) The lithium ion battery cell with high energy density has the fast charging capability of 20 min; (4) The lithium ion battery cell with high energy density has good safety performance.

In a third aspect of the present invention, an electric device is provided. According to the embodiment of the present invention, the above electric device has the above battery of the above embodiment. Therefore, the electric equipment loaded with the battery with excellent safety performance and service life also has excellent safety performance and service life, thereby further meeting the use requirements of consumers.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A battery cover plate, comprising:

lower plastic, the plastic is established down the below of apron body, the plastic includes first recess and second recess down, first recess at least part sets up annotate under the liquid hole, the at least part setting of second recess is in under the explosion-proof valve, be equipped with a plurality of outage holes on the lateral wall of first recess, just do not set up the outage hole on the diapire of first recess.

2. The battery cover plate according to claim 1, wherein the aperture of the drain hole is 2 to 5mm.

3. The battery cover plate according to claim 2, wherein the distance between the adjacent drain holes is 1 to 5mm.

4. The battery cover plate according to any one of claims 1 to 3, wherein a plurality of vent holes are formed in the bottom wall of the second groove, and the total area of the plurality of vent holes is 7 to 30 percent of the area of the bottom wall of the second groove.

5. The battery cover plate according to claim 4, wherein the hole diameter of the vent hole is 2-5mm.

6. The battery cover plate according to claim 5, wherein the interval between the adjacent vent holes is 1-5mm.

7. The battery cover plate according to any one of claims 1 to 3, wherein the first groove communicates with the second groove.

8. The battery cover plate according to any one of claims 1 to 3, wherein the distance between the explosion-proof valve and the pole is 4 to 18mm, the distance between the explosion-proof valve and the liquid injection hole is 2 to 4mm, and the distance between the edge of the explosion-proof valve and the side edge of the cover plate body is 4 to 6mm.

9. A battery having the battery cover plate according to any one of claims 1 to 8, the thickness of the battery being 10 to 50mm, the width of the battery being 90 to 120mm, the length of the battery being 200 to 600mm, and the ratio of the length to the thickness being 12 to 60.

10. An electric device comprising the battery according to claim 9.