CN219123346U - Battery cover plate and lithium battery - Google Patents

Abstract

The utility model discloses a battery cover plate and a lithium battery, wherein the battery cover plate comprises a cover plate body and a negative pole column body, the cover plate body comprises a metal substrate and an insulating mounting plate, the metal substrate covers a shell of the lithium battery, the insulating mounting plate is connected to one side of the metal substrate and is arranged in the shell of the lithium battery, a positive pole boss is convexly arranged on one side of the metal substrate, which is away from the insulating mounting plate, and the insulating mounting plate is provided with a conductive hole communicated with the positive pole boss; the negative pole cylinder wears to locate the metal base plate with insulating mounting panel, the negative pole cylinder with the metal base plate mutual insulation sets up. The technical scheme of the utility model aims to simplify the whole structure of the battery cover plate, enhance the uniformity of the battery cover plate and improve the practicability of the battery cover plate.

Description

Battery cover plate and lithium battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a battery cover plate and a lithium battery.

Background

In the prior art, a battery cover plate of a lithium battery is mostly provided with a positive electrode column body and a negative electrode column body in a riveting manner on an insulating cover plate, so that the positive electrode column body and the negative electrode column body are respectively conducted with positive ions and negative ions in the lithium battery, and further, the discharging or charging of the lithium battery is realized.

On the existing battery cover plate, a positive weak guide plate is mostly installed on the positive pole column body, so that the positive weak guide plate is connected with a lithium battery shell, and then the lithium battery shell is positively charged, and corrosion of the battery in the use process is prevented. However, the installation of the weak guide plate on the positive pole column body complicates the overall structure of the battery cover plate and complicates the assembly process; and the positive pole post has certain assembly error when riveting installation, and the resistance value scope of the weak baffle of positive pole is great for the resistance value of battery cover plate of same batch production has certain difference, and the resistance value standard of battery cover plate is not good to formulate, is inconvenient for choosing unqualified product when battery cover plate production detects, influences the practicality of battery cover plate.

Disclosure of Invention

The utility model mainly aims to provide a battery cover plate, which aims to simplify the whole structure of the battery cover plate, enhance the uniformity of the battery cover plate and improve the practicability of the battery cover plate.

In order to achieve the above purpose, the battery cover plate provided by the utility model comprises a cover plate body and a negative pole column body, wherein the cover plate body comprises a metal substrate and an insulating mounting plate, the metal substrate covers the shell of the lithium battery, the insulating mounting plate is connected to one side of the metal substrate and is arranged in the shell of the lithium battery, a positive pole boss is convexly arranged on one side of the metal substrate, which is away from the insulating mounting plate, and the insulating mounting plate is provided with a conductive hole communicated with the positive pole boss; the negative pole cylinder wears to locate the metal base plate with insulating mounting panel, the negative pole cylinder with the metal base plate mutual insulation sets up.

Optionally, the positive electrode boss is formed with a conductive groove on a surface of the metal substrate facing the insulating mounting plate, and a notch of the conductive groove surrounds the conductive hole. The insulating mounting plate is provided with a first connecting sheet, the first connecting sheet is abutted against the surface of the insulating mounting plate, which is away from the metal substrate, and part of the first connecting sheet penetrates through the conductive hole to be connected with the bottom wall of the conductive groove.

Optionally, a drain hole communicated with the conductive groove is further formed in the peripheral side of the conductive hole, and the drain hole is at least partially exposed out of the first connecting sheet.

Optionally, an insulating sheet is disposed on the metal substrate, and the insulating sheet is disposed between the negative electrode column and a surface of the metal substrate opposite to the insulating mounting plate.

Optionally, the negative pole column body comprises a negative pole willow nail and a pressing plate, the negative pole willow nail penetrates through the metal base plate and the insulation mounting plate, and the insulation sheet is arranged between the negative pole willow nail and the plate surface of the metal base plate, which is away from the insulation mounting plate; the pressing plate is abutted against the surface of the insulating mounting plate, which is away from the metal substrate, and is connected with one end of the negative pole willow pin penetrating through the insulating mounting plate.

Optionally, the metal substrate deviates from the concave accommodation groove that is equipped with of face of insulating mounting panel, the insulating piece is located in the accommodation groove, and the butt the tank bottom wall of accommodation groove, the negative pole willow nail deviate from the one end of clamp plate with the insulating piece deviates from the surface butt of accommodation groove.

Optionally, the negative pole willow nail wears to locate in proper order the insulating piece the metal substrate with insulating mounting panel, the negative pole cylinder still includes the sealing washer, the sealing washer is located between the negative pole willow nail with the insulating piece.

Optionally, the insulating mounting plate is further provided with a second connecting sheet, and the second connecting sheet abuts against the surface of the insulating mounting plate, which faces away from the metal substrate, and is connected with the pressing plate.

Optionally, protruding spacing post that is equipped with around the insulating mounting panel, spacing post is used for the butt lithium cell's shells inner wall.

Optionally, the mounting hole has still been seted up to the metal base plate, the battery apron still includes explosion-proof valve, explosion-proof valve install in the metal base plate is towards the face of insulating mounting panel, and the part is located in the mounting hole, be equipped with the filter screen on the insulating mounting panel, the filter screen surrounds the explosion-proof valve sets up.

Optionally, a fixing groove is concavely formed in the surface, facing the metal substrate, of the insulating mounting plate, a notch of the fixing groove surrounds the explosion-proof valve, and the filter screen is mounted in the fixing groove.

Optionally, the metal substrate deviates from the face of insulating mounting panel is equipped with the protection film, the protection film shroud the mounting hole sets up.

The utility model also provides a lithium battery which is characterized by comprising a battery body and a battery cover plate, wherein the battery cover plate is the battery cover plate, and the battery cover plate is connected with the battery body.

According to the technical scheme, the shell of the lithium battery is covered by the metal substrate, the positive electrode boss is formed on the metal substrate in a protruding mode, the insulating mounting plate is connected to the metal substrate and is arranged in the shell of the lithium battery, positive ions in the lithium battery can be conducted with the positive electrode boss through the conductive holes by arranging the conductive holes on the insulating mounting plate, the positive electrode boss forms the positive electrode of the lithium battery, and the shell of the lithium battery can be positively charged under the conductive action of the metal substrate, so that the anti-corrosion effect is achieved. Simultaneously, through utilizing the negative cylinder to wear to establish metal base plate and insulating mounting panel to make negative cylinder and metal base plate mutual insulation setting, under insulating mounting panel and negative cylinder and metal base plate mutual insulation's effect, can prevent that negative cylinder and metal base plate from switching on and causing the lithium cell short circuit, make negative cylinder can be well with the anion of lithium cell switch on, make negative cylinder can form the negative pole of lithium cell well, and then make the lithium cell can realize discharging and charging under the effect of anodal boss and negative cylinder. The anode boss is convexly arranged on the metal substrate to form the anode of the lithium battery, and the metal substrate is used for conducting the shell of the lithium battery, so that the integral structure of the battery cover plate can be effectively simplified, the assembly convenience of the battery cover plate is improved, the riveting anode column body on the battery cover plate and the installation of the anode weak guide plate are reduced, the assembly error of the anode on the battery cover plate is further reduced, and the production uniformity and the practicability of the battery cover plate are improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a three-dimensional block diagram of one embodiment of a battery cover plate of the present utility model;

FIG. 2 is an exploded view of the three-dimensional structure of one embodiment of the battery cover plate of FIG. 1;

FIG. 3 is a bottom structural view of one embodiment of the battery cover plate of FIG. 1;

FIG. 4 is a cross-sectional view of one embodiment of the battery cover plate of FIG. 1;

fig. 5 is a cross-sectional exploded view of one embodiment of the battery cover plate of fig. 4.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

On the current battery apron, will install the anodal weak baffle on anodal cylinder mostly, make the casing of anodal weak baffle connection lithium cell, and then make positively charged on the lithium cell casing, prevent that the battery from taking place the corruption in the use. However, the installation of the weak guide plate on the positive pole column body complicates the overall structure of the battery cover plate and complicates the assembly process; and the positive pole post has certain assembly error when riveting installation, and the resistance value scope of the weak baffle of positive pole is great for the resistance value of battery cover plate of same batch production has certain difference, and the resistance value standard of battery cover plate is not good to formulate, is inconvenient for choosing unqualified product when battery cover plate production detects, influences the practicality of battery cover plate. In view of the above problems, the present utility model proposes a battery cover plate 100.

Referring to fig. 1 to 5, in the embodiment of the present utility model, the battery cover 100 includes a cover body 10 and a negative electrode post 30, the cover body 10 includes a metal substrate 11 and an insulating mounting plate 13, the metal substrate 11 covers a casing of the lithium battery, the insulating mounting plate 13 is connected to one side of the metal substrate 11 and is disposed in the casing of the lithium battery, a positive electrode boss 111 is protruding from one side of the metal substrate 11 facing away from the insulating mounting plate 13, and the insulating mounting plate 13 is provided with a conductive hole 131 communicating with the positive electrode boss 111; the negative electrode column 30 penetrates through the metal substrate 11 and the insulating mounting plate 13, and the negative electrode column 30 and the metal substrate 11 are mutually insulated.

It can be appreciated that the metal substrate 11 may be punched on the metal substrate 11 by using a punching device to form the positive electrode boss 111, or the metal substrate 11 may be turned on the metal substrate 11 by using a turning device, so as to reduce the assembling procedure of the positive electrode on the battery cover plate 100, reduce the assembling error of the positive electrode, and improve the uniformity of the battery cover plate 100. Meanwhile, the shell of the lithium battery is covered by the metal substrate 11, so that the shell of the lithium battery and the anode of the lithium battery are conducted, positive ions in the lithium battery can be transmitted to the shell of the lithium battery through the metal substrate 11, the shell of the lithium battery is positively charged, corrosion of metals on the shell of the lithium battery in a long time process is reduced, the anode weak guide plate arranged on the battery cover plate 100 can be reduced by utilizing the metal substrate 11 to conduct with the shell of the lithium battery, the overall structure of the battery cover plate 100 is further simplified, and the assembly convenience of the battery cover plate 100 is improved. The insulating mounting plate 13 is arranged on the metal substrate 11, the insulating mounting plate 13 is arranged in the shell of the lithium battery, meanwhile, the negative electrode column 30 is penetrated through the metal substrate 11 and the insulating mounting plate 13, and insulating coatings are sprayed on the contact surfaces of the negative electrode column 30 and the metal substrate 11 or insulating materials are paved between the negative electrode column 30 and the metal substrate 11, so that the negative electrode column 30 and the metal substrate 11 are mutually insulated, the electric conduction between the negative electrode column 30 and the metal substrate 11 is isolated, the installation of the negative electrode on the battery cover plate 100 is realized, the integral structure of the battery cover plate 100 is effectively simplified, and the assembly convenience of the battery cover plate 100 is improved. At this time, the negative electrode column 30 and the metal substrate 11 are insulated from each other, and under the isolation action of the insulating mounting plate 13, the negative electrode column 30 can be penetrated through the metal substrate 11 and not conducted with the metal substrate 11, so that the short circuit of the lithium battery caused by direct conduction between the negative electrode column 30 and the positive electrode boss 111 is avoided, and the normal use of the battery cover plate 100 is ensured. The conductive holes 131 formed on the insulating mounting plate 13 can ensure that positive ions in the lithium battery can pass through the insulating mounting plate 13 and be conducted with the positive electrode boss 111, so that the positive electrode boss 111 forms the positive electrode of the battery cover plate 100.

According to the technical scheme, the metal substrate 11 is used for covering the shell of the lithium battery, the positive electrode boss 111 is formed on the metal substrate 11 in a protruding mode, the insulating mounting plate 13 is connected to the metal substrate 11 and is arranged in the shell of the lithium battery, positive ions in the lithium battery can be conducted with the positive electrode boss 111 through the conductive holes 131 by arranging the conductive holes 131 on the insulating mounting plate 13, the positive electrode boss 111 forms the positive electrode of the lithium battery, and the shell of the lithium battery can be positively charged under the conductive action of the metal substrate 11, so that the anti-corrosion effect is achieved. Meanwhile, through utilizing the negative column body to penetrate through the metal substrate 11 and the insulating mounting plate 13 and enabling the negative column body 30 and the metal substrate to be mutually insulated, under the mutual insulation effect of the insulating mounting plate 13 and the negative column body 30 and the metal substrate 11, the negative column body 30 and the metal substrate 11 can be prevented from being conducted to cause short circuit of the lithium battery, so that the negative column body 30 can be well conducted with negative ions of the lithium battery, the negative column body 30 can be well formed into a negative electrode of the lithium battery, and then the lithium battery can be discharged and charged under the effect of the positive boss 111 and the negative column body 30. The anode boss 111 is convexly arranged on the metal substrate 11 to form the anode of the lithium battery, and the metal substrate 11 is used for conducting the shell of the lithium battery, so that the overall structure of the battery cover plate 100 can be effectively simplified, the assembly convenience of the battery cover plate 100 is improved, the riveting of an anode column body on the battery cover plate 100 and the installation of an anode weak guide plate are reduced, the assembly error of the anode on the battery cover plate 100 is further reduced, and the production uniformity and the practicability of the battery cover plate 100 are improved.

Referring to fig. 2, 4 and 5, in one embodiment of the present utility model, the positive electrode boss 111 is formed with a conductive groove 1111 at a surface of the metal substrate 11 facing the insulating mounting plate 13, and a notch of the conductive groove 1111 is disposed around the conductive hole 131. The insulating mounting plate 13 is provided with a first connecting piece 133, and the first connecting piece 133 abuts against the plate surface of the insulating mounting plate 13 facing away from the metal substrate 11 and partially penetrates through the conductive hole 131 to be connected with the bottom wall of the conductive groove 1111.

It will be appreciated that the metal substrate 11 may be stamped to form the positive electrode tab 111, where the stamped locations on the metal substrate 11 would leave conductive grooves 1111 formed by stamping the positive electrode tab 111. By connecting with the conductive groove 1111 through the conductive hole 131 by the first connection tab 133, positive ions in the lithium battery and the positive electrode boss 111 can be communicated by the first connection tab 133, so that the positive electrode boss 111 is formed as the positive electrode of the battery cover plate 100. Meanwhile, under the action of the first connecting piece 133, the connection area of the positive electrode boss 111 and positive ions in the lithium battery can be effectively enlarged, so that the positive ions can be better conducted with the positive electrode boss 111. The first connection plate may be connected to the positive electrode boss 111 by welding, or may be connected to the insulating mounting plate 13 and partially abutted on the groove bottom wall of the conductive groove 1111.

Further, referring to fig. 2 to 4, in an embodiment of the present utility model, a drain hole 1311 communicating with the conductive groove 1111 is further provided at a peripheral side of the conductive hole 131, and the drain hole 1311 is at least partially exposed to an outside of the first connection piece 133.

It can be appreciated that, during transportation or use of the lithium battery, the electrolyte in the lithium battery can enter the conductive groove 1111 through the conductive hole 131, so that a certain probability exists between the conductive groove 1111 and the insulating mounting plate 13, which affects the operation of the lithium battery. In this embodiment, by providing the drain hole 1311 on the peripheral side of the conductive hole 131, the liquid accumulation between the conductive groove 1111 and the insulating mounting plate 13 can flow back into the lithium battery through the drain hole 1311, so as to reduce the influence of the liquid accumulation, and further improve the structural stability and reliability of the battery cover plate 100. The liquid drain hole 1311 may be integrally disposed on the outer side of the first connecting plate 133, or may be partially covered by the first connecting plate 133 and partially exposed on the outer side of the first connecting plate 133, so that the liquid drain hole 1311 is prevented from being completely blocked by the first connecting plate 133, and drainage of the effusion is ensured.

Referring to fig. 2, 4 and 5, in one embodiment of the present utility model, the negative pole column 30 includes a negative pole nail 31 and a pressing plate 33, the negative pole nail 31 is penetrated through the metal base plate 11 and the insulating mounting plate 13, and the insulating sheet 1131 is provided between the negative pole nail 31 and the plate surface of the metal base plate 11 facing away from the insulating mounting plate 13; the pressing plate 33 abuts against the insulating mounting plate 13 and faces away from the plate surface of the metal substrate 11, and is connected with one end of the negative electrode willow nail 31 penetrating through the insulating mounting plate 13.

In this embodiment, the metal substrate 11 and the insulating mounting plate 13 are penetrated by the negative electrode willow nails 31, the negative electrode willow nails 31 are connected to the surface of the insulating mounting plate 13, which is away from the metal substrate 11, by using the pressing plate 33, the negative electrode willow nails 31 and the pressing plate 33 can be pressed together by hammering, the metal substrate 11 and the insulating mounting plate 13 are clamped by the negative electrode column 30, and then negative ions in the lithium battery can be transferred to the negative electrode willow nails 31 through the pressing plate 33, so that the conduction between the negative electrode column 30 and the lithium battery is realized. Through utilizing negative pole willow nail 31 and clamp plate 33 to connect and form negative pole cylinder 30, can effectively simplify the overall structure of negative pole cylinder 30, be convenient for reduce the overall thickness of negative pole cylinder 30, be convenient for the frivolous design of battery cover plate 100, further improve the practicality of battery cover plate 100. Wherein, during installation, the insulating sheet 1131 can be arranged on the surface of the negative pole willow nail 31 facing the metal substrate 11, so that the insulating sheet 1131 is arranged between the negative pole willow nail 31 and the metal substrate 11 when the negative pole willow nail 31 is connected with the pressing plate 33, thereby realizing the electrical isolation between the negative pole column 30 and the metal substrate 11, and being beneficial to better improving the installation convenience of the negative pole column 30. And through at the surface connection clamp plate 33 and negative pole willow nail 31 that insulating mounting panel 13 deviates from metal substrate 11, can make the mounting site setting of negative pole cylinder 30 in the lithium cell for negative pole willow nail 31 deviates from the negative pole contact of clamp plate 33 surface formation battery apron 100, be favorable to avoiding to the battery apron 100 and need polish the contact and have certain probability and make the connection on negative pole willow nail 31 and the clamp plate 33 destroyed when doing reworking or the reutilization, influence the connection stability between negative pole willow nail 31 and the clamp plate 33, further improved battery apron 100's practicality and reliability.

Referring to fig. 2, 4 and 5, in one embodiment of the present utility model, an insulating sheet 1131 is disposed on the metal substrate 11, and the insulating sheet 1131 is disposed between the anode post 30 and a surface of the metal substrate 11 opposite to the insulating mounting plate 13.

In this embodiment, the insulating sheet 1131 may be a sheet made of insulating plastic or insulating rubber, or an insulating gasket, or the like, and the insulating sheet 1131 may be laid between the anode column 30 and the metal substrate 11, or the insulating sheet 1131 may be fixed on the metal substrate 11, and the anode column 30 is abutted against the surface of the insulating sheet 1131 facing away from the metal substrate 11, so that the insulating sheet 1131 may separate the anode column 30 and the metal substrate 11, isolating direct conduction between the anode column 30 and the metal substrate 11, thereby achieving mutual insulation between the anode column 30 and the metal substrate 11. The insulating sheet 1131 is adopted to realize mutual insulation between the negative electrode column 30 and the metal substrate 11, so that the processing procedure of the battery cover plate 100 can be well simplified, the insulating sheet 30 and the metal substrate 11 can be stacked during assembly, or the insulating sheet 1131 can be fixed on the metal substrate 11, so that the negative electrode column 30 can be assembled on the battery cover plate 100 by directly penetrating the metal substrate 11 and the insulating mounting plate 13, and the convenience in assembly of the battery cover plate 100 can be further improved.

Further, referring to fig. 2 and 5, in one embodiment of the present utility model, a surface of the metal substrate 11 facing away from the insulating mounting plate 13 is concavely provided with a receiving groove 113, an insulating sheet 1131 is disposed in the receiving groove 113 and abuts against a groove bottom wall of the receiving groove 113, and one end of the negative pole willow pin 31 facing away from the pressing plate 33 abuts against a surface of the insulating sheet 1131 facing away from the receiving groove 113.

In this embodiment, by providing the accommodating groove 113 on the metal substrate 11, the insulating sheet 1131 can be disposed in the accommodating groove 113, which is favorable for reducing the distance between the negative pole willow pin 31 and the surface of the metal substrate 11, so that the portion of the negative pole column 30 exposed above the metal substrate 11 is fewer, which is convenient for further reducing the thickness of the negative pole column 30, and further facilitating the overall lightweight design of the battery cover plate 100. The insulating sheet 1131 may be partially accommodated in the accommodating groove 113, so that the portion of the insulating sheet 1131 exposed outside the accommodating groove 113 may further isolate the negative electrode stud 31 from the metal substrate 11, further avoid conduction between the negative electrode post 30 and the metal substrate 11, and ensure normal operation of the battery cover plate 100. Secondly, the insulating sheet 1131 can be completely disposed in the accommodating groove 113, and at this time, the surface of the insulating sheet 1131 abutting against the negative pole willow pin 31 can wrap the negative pole willow pin 31, so as to reduce the contact between the negative pole willow pin 31 and the metal substrate 11, and further improve the practicality and reliability of the battery cover plate 100.

Further, referring to fig. 2, 4 and 5, in one embodiment of the present utility model, the negative pole willow pin 31 is sequentially inserted through the insulating sheet 1131, the metal substrate 11 and the insulating mounting plate 13, the negative pole column 30 further includes a sealing ring 35, and the sealing ring 35 is disposed between the negative pole willow pin 31 and the insulating sheet 1131.

In this embodiment, the insulating sheet 1131, the metal substrate 11 and the insulating mounting plate 13 may be sequentially stacked, so that the negative pole willow pin 31 directly passes through to complete the assembly of the negative pole column 30, which effectively simplifies the assembly process of the negative pole column 30, is beneficial to further improving the overall mounting efficiency of the battery cover plate 100 and the practicality of the battery cover plate 100. At this time, the insulating sheet 1131 may employ an insulating rubber gasket slightly larger than the size of the negative electrode tab 31, or may employ an insulating plastic member or the like wrapping the negative electrode tab 31. And through setting up sealing washer 35 between negative pole willow nail 31 and insulating piece 1131, can utilize sealing washer 35 to block up the clearance between negative pole willow nail 31 and the insulating piece 1131, be favorable to avoiding the electrolyte in the lithium cell to permeate to the surface of metal substrate 11 through the gap between negative pole willow nail 31 and the insulating piece 1131, influence the normal use of lithium cell for the sealed effect of battery cover plate 100 is better, has further improved battery cover plate 100's overall structure stability, makes battery cover plate 100 can cover the lithium cell better. The sealing ring 35 may be a sealing ring 35 made of silica gel or rubber, so that the sealing ring 35 may play a certain role in insulation, further reduce contact between the negative electrode post 30 and the metal substrate 11, avoid conduction between the negative electrode post 30 and the positive electrode boss 111, and further improve reliability and stability of the battery cover plate 100.

Referring to fig. 2, 3 and 5, in one embodiment of the utility model, the insulating mounting plate 13 is further provided with a second connecting piece 135, the second connecting piece 135 abutting against the surface of the insulating mounting plate 13 facing away from the metal base plate 11 and connecting the pressure plate 33.

In this embodiment, the second connecting piece 135 is disposed on the surface of the insulating mounting plate 13 facing away from the metal substrate 11 to connect the pressing plate 33 of the negative electrode column 30, so that the contact area of the pressing plate 33 can be effectively increased by using the second connecting piece 135, so that the contact area of the negative electrode column and negative ions in the lithium battery is larger, the conductivity of the negative electrode column 30 is convenient to be improved, the overall conductivity of the battery cover plate 100 is better, and the stability and reliability of the battery cover plate 100 are further improved. Meanwhile, under the action of the second connecting plate, the overall thickness of the negative electrode column 30 can be reduced, and the light and thin design of the battery cover plate 100 is facilitated. The second connecting plate can be connected to the pressing plate 33 by welding or screws and is installed in a manner of abutting against the insulating plate; or may be clamped or screwed to the insulating mounting plate 13 and coupled to the pressure plate 33 to effect the mounting of the second connecting tab 135.

Referring to fig. 2, 3 and 5, in one embodiment of the present utility model, the periphery of the insulating mounting plate 13 is convexly provided with a limiting post 137, and the limiting post 137 is used to abut against the inner wall of the housing of the lithium battery.

In this embodiment, through protruding the limit post 137 around insulating mounting panel 13, when can making battery apron 100 install on the lithium cell, make the limit post 137 can the butt lithium cell can the inner wall, and then utilize limit post 137 can carry out certain spacing to battery apron 100, avoid battery apron 100 to slide on the lithium cell after the installation, be convenient for battery apron 100 to utilize limit post 137 to realize location installation simultaneously, be convenient for further simplify battery apron 100's assembly process, effectively improved battery apron 100's assembly convenience and overall structure stability. Under the action of the limiting post 137, the screw can be used to penetrate into the limiting post 137 at the outer side of the lithium battery shell to mount the battery cover plate 100 on the lithium battery; or can set up the fixed spacing post 137 of clamping piece centre gripping on the inner wall of lithium cell casing and realize the installation of battery apron 100 and lithium cell, further simplified the whole assembly process of lithium cell, improved the practicality of battery apron 100.

Referring to fig. 2 and 5, in one embodiment of the present utility model, the metal substrate 11 is further provided with a mounting hole 115, the battery cover plate 100 further includes an explosion-proof valve 50, the explosion-proof valve 50 is mounted on a surface of the metal substrate 11 facing the insulating mounting plate 13 and is partially disposed in the mounting hole 115, a filter screen 1391 is disposed on the insulating mounting plate 13, and the filter screen 1391 is disposed around the explosion-proof valve 50.

In this embodiment, by disposing the explosion-proof valve 50 on the mounting hole 115 of the metal substrate 11, when the lithium battery is improperly used and expanded, the explosion-proof valve 50 can be triggered by the gas generated by the expansion of the lithium battery, so that the explosion-proof valve 50 can exhaust the lithium battery and control the lithium battery to be powered off, thereby avoiding the expansion and explosion of the lithium battery, further improving the safety performance of the lithium battery and improving the reliability and stability of the battery cover plate 100. Secondly, through setting up filter screen 1391 on insulating mounting panel 13 and enclosing explosion-proof net, can utilize filter screen 1391 to keep apart liquid or solid in the lithium cell, only allow gas to pass through and trigger explosion-proof valve 50, and then avoid liquid and solid in the lithium cell to influence explosion-proof valve 50 to filter screen 1391 can also stop liquid and solid in the lithium cell and reveal outside battery cover plate 100 through explosion-proof valve 50 and mounting hole 115 after taking place to expand, further improved battery cover plate 100's practicality and reliability, make battery cover plate 100 have certain barrier property.

Further, referring to fig. 2, 4 and 5, in one embodiment of the present utility model, a fixing groove 139 is concavely formed on the surface of the insulating mounting plate 13 facing the metal base plate 11, the notch of the fixing groove 139 surrounds the explosion-proof valve 50, and a filter screen 1391 is installed in the fixing groove 139.

In this embodiment, by arranging the fixing groove 139 on the insulating mounting plate 13 to cover the explosion-proof valve 50 and installing the filter screen 1391 in the fixing groove 139, a certain distance can be provided between the explosion-proof valve 50 and the filter screen 1391 under the action of the fixing groove 139, so that the gas in the lithium battery can be filled in the fixing groove 139 before acting on the explosion-proof valve 50, so that the explosion-proof valve 50 can have a certain trigger gap, the explosion-proof valve 50 is prevented from being triggered by mistake when the lithium battery is normally used, the overall structural stability of the battery cover plate 100 is further improved, and the battery cover plate 100 is more reliable and practical. Wherein, filter screen 1391 can attach in fixed slot 139 to set up the via hole of a plurality of intercommunication filter screens 1391 on the cell wall of fixed slot 139, and then be favorable to reducing to set up complicated mounting structure installation filter screen 1391 in fixed slot 139, the assembly of filter screen 1391 of being convenient for can make filter screen 1391 and fixed slot 139's connection area bigger through attaching the installation simultaneously, effectively improve filter screen 1391 installation stability.

Referring to fig. 1, 2 and 5, in one embodiment of the present utility model, a plate surface of the metal substrate 11 facing away from the insulating mounting plate 13 is provided with a protective film 117, and the protective film 117 is disposed to cover the mounting hole 115.

In this embodiment, by providing the protection film 117 on the plate surface of the beley insulation mounting plate 13 of the metal substrate 11 to cover the mounting hole 115, the protection film 117 can be utilized to protect the explosion-proof valve 50 from the surface of the metal substrate 11, which is beneficial to isolating impurities outside the metal substrate 11 from entering the mounting hole 115 to affect the stable operation of the explosion-proof valve 50, and further ensures the overall structural stability and reliability of the battery cover plate 100. The protective film 117 can be broken through by the gas in the mounting hole 115 from the mounting hole 115 when the lithium battery expands, so that the gas generated by the expansion of the lithium battery can be well discharged out of the battery cover plate 100, an explosion-proof effect is achieved, and the reliability of the battery cover plate 100 is further improved.

The utility model also provides a lithium battery, which comprises a battery body and a battery cover plate 100, wherein the specific structure of the battery cover plate 100 refers to the embodiment, and as the lithium battery adopts all the technical schemes of all the embodiments, the lithium battery at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted. Wherein, the battery cover plate 100 is connected to the battery body.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (13)

1. A battery cover plate for a lithium battery, the battery cover plate comprising:

the lithium battery cover comprises a cover plate body, wherein the cover plate body comprises a metal substrate and an insulating mounting plate, the metal substrate covers the shell of the lithium battery, the insulating mounting plate is connected to one side of the metal substrate and is arranged in the shell of the lithium battery, a positive boss is convexly arranged on one side, away from the insulating mounting plate, of the metal substrate, and a conductive hole communicated with the positive boss is formed in the insulating mounting plate; and

the negative pole cylinder, the negative pole cylinder wears to locate the metal base plate with insulating mounting panel, the negative pole cylinder with the metal base plate mutual insulation sets up.

2. The battery cover plate according to claim 1, wherein the positive electrode boss is formed with a conductive groove in a surface of the metal substrate facing the insulating mounting plate, and a notch of the conductive groove is disposed around the conductive hole;

the insulating mounting plate is provided with a first connecting sheet, the first connecting sheet is abutted against the surface of the insulating mounting plate, which is away from the metal substrate, and part of the first connecting sheet penetrates through the conductive hole to be connected with the bottom wall of the conductive groove.

3. The battery cover plate according to claim 2, wherein a drain hole communicating with the conductive groove is further provided on a peripheral side of the conductive hole, and the drain hole is at least partially exposed to an outside of the first connecting piece.

4. The battery cover plate of claim 1, wherein an insulating sheet is provided on the metal substrate, and the insulating sheet is provided between the negative electrode post and a surface of the metal substrate facing away from the insulating mounting plate.

5. The battery cover of claim 4, wherein the negative electrode post comprises:

the negative pole willow nail penetrates through the metal base plate and the insulation mounting plate, and the insulation sheet is arranged between the negative pole willow nail and the plate surface, deviating from the insulation mounting plate, of the metal base plate; and

and the pressing plate is abutted against the surface of the insulating mounting plate, which is away from the metal substrate, and is connected with one end of the negative pole willow pin penetrating through the insulating mounting plate.

6. The battery cover plate according to claim 5, wherein the metal substrate is concavely provided with a containing groove facing away from the surface of the insulating mounting plate, the insulating sheet is arranged in the containing groove and is abutted against the groove bottom wall of the containing groove, and one end of the negative pole willow pin facing away from the pressing plate is abutted against the surface of the insulating sheet facing away from the containing groove.

7. The battery cover plate of claim 5, wherein the negative electrode tab is sequentially disposed through the insulating sheet, the metal substrate, and the insulating mounting plate, and the negative electrode post further comprises a sealing ring disposed between the negative electrode tab and the insulating sheet.

8. The battery cover plate of claim 5, wherein the insulating mounting plate is further provided with a second connecting piece, the second connecting piece abutting against a surface of the insulating mounting plate facing away from the metal base plate and connecting the pressing plate.

9. The battery cover plate according to any one of claims 1 to 8, wherein limit posts are protruding around the insulating mounting plate, and the limit posts are used for abutting against the inner wall of the lithium battery.

10. The battery cover plate according to any one of claims 1 to 8, wherein the metal base plate is further provided with a mounting hole, the battery cover plate further comprises an explosion-proof valve, the explosion-proof valve is mounted on the metal base plate towards the surface of the insulating mounting plate and is partially arranged in the mounting hole, a filter screen is arranged on the insulating mounting plate, and the filter screen surrounds the explosion-proof valve.

11. The battery cover plate of claim 10, wherein a surface of the insulating mounting plate facing the metal base plate is concavely provided with a fixing groove, a notch of the fixing groove surrounds the explosion-proof valve, and the filter screen is mounted in the fixing groove.

12. The battery cover plate of claim 10, wherein the metal substrate is provided with a protective film facing away from the plate surface of the insulating mounting plate, the protective film covering the mounting hole.

13. A lithium battery, characterized in that the lithium battery comprises a battery body and a battery cover plate, wherein the battery cover plate is the battery cover plate of claims 1 to 12, and the battery cover plate is connected to the battery body.

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