CN217485586U - Lithium battery cover plate with good protection effect - Google Patents

Abstract

A lithium battery cover plate with good protection effect comprises a cover plate body; insulating support: positive and negative electrode posts; the method is characterized in that: the lithium battery also comprises a positive pole electrode lead sheet and a negative pole electrode lead sheet which are electrically connected with the lithium battery core; establish the pressure release hole at the length direction's of apron body middle part, the pressure release hole is waist shape pore structure, establish pressure release explosion-proof mechanism among the pressure release hole, pressure release explosion-proof mechanism includes rupture membrane and explosion-proof protection pad pasting, the rupture membrane is installed in the bottom position department of pressure release hole, explosion-proof protection pad pasting is established on the one side surface of the orientation of apron body and is covered the pressure release hole, the shape of explosion-proof protection pad pasting and the shape looks adaptation in pressure release hole, all seted up the exhaust hole on both ends semicircle position about explosion-proof protection pad pasting, the exhaust hole is arc hole structure. Through seting up the arc hole and making explosion-proof protection pad pasting can block the dust and enlarge the displacement and promote the security, prevent insulating support flexible deformation and ensure installation reliability, avoid apron body to corrode under the condition that bursts appearing simultaneously.

Description

Lithium battery cover plate with good protection effect

Technical Field

The utility model belongs to the technical field of lithium cell component, concretely relates to lithium cell apron that protecting effect is good.

Background

Lithium batteries have become ubiquitous, ranging from smart phones to electric vehicles, sweeping an obstacle for the increasingly tightly connected world. Compared with other commercialized rechargeable batteries, the lithium battery has the advantages of high energy density, long cycle life, wide working temperature range, safety, reliability and the like. As is known in the art, a lithium battery is composed of a case, a lithium battery cell, which may be referred to as a winding core, disposed in the case, and includes a positive plate, a separator, and a negative plate, wherein the separator separates the positive plate from the negative plate, and has a positive plate foil and a negative plate foil extending portion on two sides of the lithium battery cell, and a cover plate disposed on the upper portion of the lithium battery cell and welded and sealed therewith to form the battery. The cover plate is a main part of the lithium battery and comprises a cover plate base body, positive and negative poles, a sealing gasket, an electrode pressing plate, an electrode lead piece and the like. In the existing lithium battery cover plate structure, a pressure relief hole is usually formed in a cover plate base body, an explosion-proof film is arranged at the position of the pressure relief hole, a protective adhesive film is arranged at a position corresponding to the upper part of the explosion-proof film, and a space between the explosion-proof film and the protective adhesive film forms a pressure relief chamber; in order to facilitate the discharge of pressure gas inside the lithium battery, the conventional manufacturer usually sets a through hole on the protective film, the through hole is usually a circular hole or a strip-shaped hole structure, and the opening of the through hole is large, so that the gas can be conveniently discharged, but dust or other foreign matters easily enter the pressure relief hole through the through hole in the shape in a normal working state, so that the dust is easily accumulated, the inner part is unclean, and the risk of damaging the lithium battery core exists; secondly, there are the shortcoming that overall structure is complicated, the part is more mostly in current lithium cell apron, this undoubtedly greatly increased manufacturing cost and be unfavorable for subsequent maintenance and repair.

In view of the above prior art, it is necessary to improve the cover plate structure and the explosion-proof protection film of the conventional lithium battery reasonably. The applicant has made an advantageous design for this purpose, in the context of which the solution to be described below is made.

SUMMERY OF THE UTILITY MODEL

The task of the utility model is to provide a simple structure, reliable safety, be favorable to making the explosion-proof protection pad pasting effectively stop the dust and enlarge the air displacement and promote the security simultaneously appearing bursting the condition through abandoning the circular port or the rectangular shape hole on the current explosion-proof protection pad pasting and seting up the arc hole, help preventing insulating support flexible deformation and ensure the installation reliability through set up telescopic protection box at the insulating support middle part, the good lithium cell cover plate of the rusty protecting effect of apron body corrosion has been avoided to the condition of being convenient for realize the electric condition of switching on between anodal post and apron body.

The task of the utility model is accomplished in this way, and the lithium battery cover plate with good protection effect comprises a cover plate body; an insulating support, the location is installed on the surface of the lower side of the cover plate body: the positive pole and the negative pole are respectively installed at the left end and the right end of the cover plate body in a matching manner, the positive pole and the cover plate body are kept in an electric conduction state, and the negative pole and the cover plate body are kept in an electric insulation state; is characterized in that: the lithium battery cell lead is characterized by also comprising a positive pole electrode lead piece and a negative pole electrode lead piece, wherein the positive pole electrode lead piece and the negative pole electrode lead piece are electrically connected with the lithium battery cell; the middle position department of the length direction of apron body has seted up a pressure release hole, and this pressure release hole is waist shape hole structure and runs through the thickness direction of apron body, is provided with a pressure release explosion-proof mechanism among this pressure release hole, and aforementioned pressure release explosion-proof mechanism includes an rupture membrane and an explosion-proof protection pad pasting, the rupture membrane cooperation is installed the bottom position department in pressure release hole, just explosion-proof protection pad pasting is established one side of orientation of apron body is surperficial and cover this pressure release hole, the shape of this explosion-proof protection pad pasting with the shape looks adaptation in pressure release hole, and all set up an exhaust hole that runs through its thickness direction on the both ends semicircle position about this explosion-proof protection pad pasting, two exhaust holes all are arc hole structure structures.

In a specific embodiment of the present invention, the peripheral edge portion of the rupture disk of the pressure relief explosion-proof mechanism and the bottom portion of the inner sidewall of the pressure relief hole are welded together, and an explosion-proof disk pressure-bearing cavity protruding upward is formed at the central position of the rupture disk, and the explosion-proof disk pressure-bearing cavity is of a hemispherical structure.

In another specific embodiment of the present invention, the explosion-proof membrane is made of aluminum foil, and the explosion-proof protective film is made of PET material and is transparent.

In another specific embodiment of the present invention, a positive post connecting sleeve locating hole penetrating through the thickness direction of the cover plate body is formed at the left end of the cover plate body and at a position corresponding to the positive post, a positive post connecting sleeve is fittingly installed in the positive post connecting sleeve locating hole, the positive post includes a positive post clamping cylinder and a positive post connecting plate formed at the lower end of the positive post clamping cylinder, the positive post clamping cylinder penetrates through the insulating support from below the insulating support and is fittingly installed in the positive post connecting sleeve, and the positive post clamping cylinder is fittingly installed with the positive post connecting sleeve, and at least a part of the positive post and the cover plate body is kept in an electrical connection state through the positive post connecting sleeve; the right-hand member of apron body and corresponding to the position department of negative pole post sets up a negative pole post insulation cover locating hole that runs through apron body thickness direction, installs a negative pole post insulation cover at this negative pole post insulation cover locating hole fit, and the negative pole post is including a negative pole post joint cylinder and constitute at the negative pole post connecting plate of this negative pole post joint cylinder lower extreme equally, negative pole post joint cylinder also follows this insulating support is passed and is worn to establish in the negative pole post insulation cover in the below of insulating support, and this negative pole post joint cylinder and negative pole post insulation cover fit together and install and keep electrical insulation state rather than.

In another specific embodiment of the present invention, a positive post sealing member is disposed between the positive post clamping cylinder of the positive post and the insulating bracket and at a position corresponding to the middle between the positive post connecting plate and the cover plate body, and the positive post sealing member is sleeved on the positive post clamping cylinder; similarly, a negative pole column sealing piece is also arranged between the negative pole column clamping column body of the negative pole column and the insulating support and at a position corresponding to the middle of the negative pole column connecting plate and the cover plate body, and the negative pole column sealing piece is also sleeved on the negative pole column clamping column body.

In still another specific embodiment of the present invention, a positive post conducting sleeve marking plate cooperatively mounted on an upward side surface of the cover plate body is formed on the positive post conducting sleeve, and a power supply positive identification mark is disposed on an upward side surface of the positive post conducting sleeve marking plate; similarly, a negative pole conductive sleeve marking plate which is installed on the upward side surface of the cover plate body in a matched mode is formed on the negative pole insulating sleeve, and a power supply negative pole identification mark is arranged on the upward side surface of the negative pole conductive sleeve marking plate.

In yet another specific embodiment of the present invention, the positive electrode tab is provided with a positive electrode tab connecting portion disposed in a horizontal state, the positive electrode tab connecting portion is welded and fixed to the positive electrode connecting plate of the positive electrode, and the front end protruding insulating bracket of the positive electrode tab is configured as a positive electrode tab connecting wing for electrically connecting to the lithium battery cell, a positive electrode tab bending portion extending in a vertical direction is configured between the positive electrode tab connecting portion and the positive electrode tab connecting wing, and a positive electrode tab bending section protruding upward and preformed at 180 degrees is configured on the positive electrode tab connecting wing; the negative pole post electrode tab has a negative pole post electrode tab connecting portion that sets up with the horizontality, this negative pole post electrode tab connecting portion with negative pole post connecting plate welded fastening is in the same place, and the front end of this negative pole post electrode tab also stretches out insulating support constitution and constitutes for being used for with lithium cell electrical connection's negative pole post electrode tab connection wing it has a negative pole post electrode tab portion of bending that extends the setting along vertical direction to constitute between negative pole post electrode tab connecting portion and the negative pole post electrode tab connection wing, and constitutes on this negative pole post electrode tab connection wing to have the orientation epirelief and prefabricate the negative pole post electrode tab bending section of bending 180 degrees.

In a more specific embodiment of the present invention, an insulating frame protection box is formed at a middle position of the insulating frame in the length direction, a frame ventilation slot is formed at a bottom panel of the insulating frame protection box and just under the pressure relief hole, a flexible slot is formed at both ends of the frame ventilation slot, and a pair of anti-cracking flexible legs are formed at the front and rear edges of the insulating frame protection box, which make the insulating frame maintain an integrated structure and help the insulating frame to stretch.

In yet another specific embodiment of the present invention, the cover plate body is provided with a liquid injection hole corresponding to the pressure relief hole and a position between the positive poles, the liquid injection hole runs through the thickness direction of the cover plate body and can be used for injecting electrolyte into the shell cavity of the lithium battery shell through the liquid injection hole, and the insulation support is provided with a liquid injection yielding hole corresponding to the position below the liquid injection hole.

In yet another specific embodiment of the present invention, the positive electrode post and the positive electrode tab are made of aluminum, the negative electrode post is made of copper-aluminum composite material, and the negative electrode tab is made of red copper.

By adopting the above structure, the utility model, have following technological effect: firstly, the exhaust holes in the shape of arc holes are formed in the semicircular parts of the left end and the right end of the explosion-proof protection film, compared with the through holes in the shape of circular holes or long-strip-shaped holes formed in the prior art, the exhaust holes in the shape of arc holes can effectively shield dust and foreign matters in the use process, the dust and foreign matters are prevented from entering the pressure relief holes, the normal work of a lithium battery core is guaranteed, and once the pressure in the lithium battery shell exceeds a preset value, the explosion-proof film bursts and is broken under the action of pressure, the pressure gas in the aluminum battery shell can burst the semicircular film bodies on the inner sides of the two exhaust holes, the exhaust amount is enlarged, and the safety is improved; secondly, because the insulating support protection box and the anti-cracking telescopic pins are arranged on the insulating support, the left side and the right side of the insulating support are integrally formed, the problem of difficulty in assembly caused by telescopic deformation of the insulating support after plastic injection molding is avoided, meanwhile, the anti-cracking telescopic pins can ensure that the insulating support can reasonably stretch out and draw back in a high-temperature or low-temperature environment, the insulating support is prevented from arching and deforming due to expansion caused by heat and contraction caused by cold, and the safety is improved; thirdly, the positive pole electrode lead piece bending part is arranged on the positive pole electrode lead piece, so that the positive pole electrode lead piece connecting wing can extend out of the downward extending edge plate at the front end of the insulating support in a horizontal state and cannot interfere with the insulating support, meanwhile, the positive pole electrode lead piece bending section is arranged to facilitate the bending of the positive pole electrode lead piece connecting wing in the installation process, the structure of the negative pole electrode lead piece is the same, and the installation process is greatly facilitated while the structure is optimized; fourthly, the positive pole and the cover plate body can be in a semi-conducting state by arranging the positive pole conducting sleeve, and the corrosion of the cover plate body can be effectively prevented.

Drawings

Fig. 1 is an overall structural diagram of an embodiment of the present invention.

Fig. 2 is an exploded perspective view of the embodiment shown in fig. 1.

Fig. 3 is a front cross-sectional view of the embodiment shown in fig. 1.

In the figure: 1. the cover plate comprises a cover plate body, 11 pressure relief holes, 12 positive pole conducting sleeve positioning holes, 121 positive pole conducting sleeves, 1211 positive pole conducting sleeve marking plates, 1212 power supply positive pole identification marks, 13 negative pole insulating sleeve positioning holes, 131 negative pole insulating sleeves, 1311 negative pole conducting sleeve marking plates, 1312 power supply negative pole identification marks and 14 liquid injection holes; 2. insulating support, 21, insulating support protection box, 211, support air channel, 212, flexible groove, 213, crack control flexible foot, 22, annotate the liquid hole of stepping down: 3. the positive pole comprises a positive pole, a positive pole clamping column body 31, a positive pole connecting plate 32, and a positive pole sealing piece 33; 4. the negative pole column, 41, the negative pole column clamping column body, 42, the negative pole column connecting plate and 43, the negative pole column sealing member; 5. the positive pole electrode comprises a positive pole electrode lead piece, 51, a positive pole electrode lead piece connecting part, 52, a positive pole electrode lead piece connecting wing, 521, a positive pole electrode lead piece bending section and 53, a positive pole electrode lead piece bending part; 6. the negative pole electrode tab comprises a negative pole electrode tab, 61, a negative pole electrode tab connecting part, 62, a negative pole electrode tab connecting wing, 621, a negative pole electrode tab bending section and 63, a negative pole electrode tab bending part; 7. the explosion-proof structure comprises a pressure relief explosion-proof mechanism, 71 parts of an explosion-proof film, 711 parts of an explosion-proof sheet pressure-bearing cavity, 72 parts of an explosion-proof protection film and 721 parts of an exhaust hole.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes made in the form of the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position shown in fig. 1, and thus, should not be interpreted as a particular limitation to the technical solution provided by the present invention.

Referring to fig. 1 to 3, a lithium battery cover plate with good protection effect is shown, which includes a cover plate body 1, wherein the cover plate body 1 is in a rectangular plate shape; also shown is an insulating support 2, positioned and mounted on the surface of the aforementioned cover body 1 facing downwards: a positive pole post 3 and a negative pole post 4 are respectively installed at the left end and the right end of the cover plate body 1 in a matching manner, the positive pole post 3 and the cover plate body 1 are kept in an electric conduction state, and the negative pole post 4 and the cover plate body 1 are kept in an electric insulation state;

as the technical scheme provided by the utility model: a positive pole electrode tab 5 and a negative pole electrode tab 6 are also shown, both of which are electrically connected to the lithium battery cell, the positive pole electrode tab 5 is fixedly mounted at a position below the positive pole 3, and the negative pole electrode tab 6 is fixedly mounted at a position below the negative pole 4; a pressure relief hole 11 is arranged at the middle position of the cover plate body 1 in the length direction, the pressure relief hole 11 is in a waist-shaped hole structure and penetrates through the thickness direction of the cover plate body 1, a pressure relief explosion-proof mechanism 7 is arranged in the pressure relief hole 11, the pressure relief explosion-proof mechanism 7 comprises an explosion-proof film 71 and an explosion-proof protection film 72, the explosion-proof film 71 is arranged at the bottom position of the pressure relief hole 11 in a matching way, the anti-explosion protection film 72 is adhered to the upward side surface of the cover plate body 1 and covers the pressure relief hole 11, the anti-explosion protection film 72 and the cover plate body 1 can be connected by gluing, the shape of the explosion-proof protection sticking film 72 is matched with that of the pressure relief hole 11, semicircular parts at the left end and the right end of the explosion-proof protection sticking film 72 are respectively provided with an exhaust hole 721 penetrating through the thickness direction of the explosion-proof protection sticking film, and the two exhaust holes 721 are both in arc hole structure; this exhaust hole 721 of arc hole shape compares and opens the through-hole of establishing round hole shape or rectangular shape hole shape in prior art, not only can effectively shelter from the dust foreign matter in the use, prevents in the dust foreign matter gets into pressure release hole 11, ensures clean, and when the gaseous outside discharge in a large number of pressure in the lithium cell casing, the gaseous semicircular membrane body that breaks two exhaust holes 721 inboards that destroys to enlarge the displacement, promote the security.

In this embodiment, the peripheral edge of the rupture disk 71 of the pressure relief and explosion prevention mechanism 7 is welded to the bottom of the inner sidewall of the pressure relief hole 11, and an explosion-proof plate pressure-bearing cavity 711 protruding upward is formed at the center of the rupture disk 71, and the explosion-proof plate pressure-bearing cavity 711 has a hemispherical structure.

Preferably, the explosion-proof film 71 is made of aluminum foil, and the explosion-proof protection film 72 is made of PET material and is in a transparent state; when the pressure in the lithium battery shell exceeds a preset value, the explosion-proof membrane 71 bursts and is broken under the action of the pressure, pressure gas in the lithium battery shell is discharged through the insulating support 2 and the pressure relief hole 11, the burst explosion-proof membrane 71 is protected and buffered through the explosion-proof protection adhesive film 72, the problem that secondary damage such as electrical short circuit is caused due to sputtering on an adjacent lithium battery is avoided, and the explosion-proof protection adhesive film 72 is in a transparent state, so that once the explosion-proof membrane 71 is damaged or bursts and broken and the like, the problem can be clearly and intuitively found, and therefore detection and maintenance measures can be rapidly taken on the whole lithium battery.

With reference to fig. 2 and fig. 3, a positive post guiding sleeve positioning hole 12 penetrating through the thickness direction of the cover plate body 1 is formed at the left end of the cover plate body 1 and at a position corresponding to the positive post 3, a positive post guiding sleeve 121 is fittingly installed in the positive post guiding sleeve positioning hole 12, the positive post 3 includes a positive post clamping cylinder 31 and a positive post connecting plate 32 formed at the lower end of the positive post clamping cylinder 31, the positive post clamping cylinder 31 penetrates through the insulating support 2 from the lower side of the insulating support 2 and is penetratingly installed in the positive post guiding sleeve 121, the positive post clamping cylinder 31 and the positive post guiding sleeve 121 are fittingly installed together, and at least a part of the positive post 3 and the cover plate body 1 is kept in an electrical connection state through the positive post guiding sleeve 121; a cathode post insulating sleeve positioning hole 13 penetrating through the thickness direction of the cover plate body 1 is formed at the right end of the cover plate body 1 and at a position corresponding to the cathode post 4, a cathode post insulating sleeve 131 is fittingly installed in the cathode post insulating sleeve positioning hole 13, the cathode post 4 also comprises a cathode post clamping cylinder 41 and a cathode post connecting plate 42 forming the lower end of the cathode post clamping cylinder 41, the cathode post clamping cylinder 41 also penetrates through the insulating support 2 from the lower part of the insulating support 2 and is penetratingly installed in the cathode post insulating sleeve 131, and the cathode post clamping cylinder 41 is fittingly installed together with the cathode post insulating sleeve 131 and keeps an electric insulation state with the cathode post insulating sleeve 131.

In this embodiment, the positive post conducting sleeve 121 is made of conductive PPS plastic, i.e., conductive polyphenylene sulfide, and the positive post conducting sleeve 121 has a characteristic that resistivity or a resistance value is adjustable, and the positive post conducting sleeve 121 can make the positive post 3 and the cover plate body 1 in a semi-conducting state, i.e., when the cover plate body 1 is positively charged, a certain resistance value is provided between the positive post 3 and the cover plate body 1; specifically, the cover plate body 1 is made of aluminum, and under the condition that the positive pole 3 and the cover plate body 1 can be electrically conducted, the potential difference between the positive pole 3 and the cover plate body 1 is out of the potential range formed by the aluminum-lithium alloy, so that the cover plate body 1 is prevented from being corroded; in addition, under the condition that the positive pole conducting sleeve 121 ensures that the cover plate body 1 is positively charged and effectively prevents self-corrosion, once the short circuit condition occurs between the negative pole 4 and the cover plate body 1, the positive pole conducting sleeve 121 can provide larger resistance to control the short circuit current within a smaller range, thereby effectively reducing the thermal runaway risk caused by the internal and external short circuits of the lithium battery and ensuring the overall safety of the lithium battery; in addition, the negative pole insulating sleeve 131 is made of insulating plastics, so that the electric insulation state between the negative pole insulating sleeve 131 and the cover plate body 1 is effectively guaranteed, and the negative pole 4 and the cover plate body 1 are prevented from conducting electricity, so that the safety of the lithium battery is further improved, and the stable operation of the lithium battery is guaranteed.

Further, a positive post sealing element 33 is arranged between the positive post clamping cylinder 31 of the positive post 3 and the insulating bracket 2 and at a position corresponding to the middle between the positive post connecting plate 32 and the cover plate body 1, and the positive post sealing element 33 is sleeved on the positive post clamping cylinder 31; similarly, a negative pole sealing member 43 is also disposed between the negative pole clamping post 41 of the negative pole 4 and the insulating support 2 and at a position corresponding to the middle between the negative pole connecting plate 42 and the cover plate body 1, and the negative pole sealing member 43 is also sleeved on the negative pole clamping post 41.

Preferably, a positive pole conductive sleeve marking plate 1211 fittingly mounted on an upward facing side surface of the cover plate body 1 is formed on the positive pole conductive sleeve 121, and a power positive pole identification mark 1212 is provided on an upward facing side surface of the positive pole conductive sleeve marking plate 1211; similarly, a negative pole conductive sleeve indicator 1311 fitted to the upper surface of the cap body 1 is formed on the negative pole insulating sleeve 131, and a negative pole identification 1312 is provided on the upper surface of the negative pole conductive sleeve indicator 1311.

Referring to fig. 2, the positive electrode tab 5 has a positive electrode tab connecting portion 51 disposed in a horizontal state, the positive electrode tab connecting portion 51 is welded and fixed to the positive electrode connecting plate 32 of the positive electrode 3, the front end of the positive electrode tab 5 protrudes out of the insulating support 2 to form a positive electrode tab connecting wing 52 for electrically connecting to the lithium battery cell, a positive electrode tab bending portion 53 extending in a vertical direction is formed between the positive electrode tab connecting portion 51 and the positive electrode tab connecting wing 52, and a positive electrode tab bending section 521 protruding upward and bent by 180 degrees is formed on the positive electrode tab connecting wing 52; the negative pole electrode tab 6 is provided with a negative pole electrode tab connecting part 61 arranged in a horizontal state, the negative pole electrode tab connecting part 61 is welded and fixed with the negative pole connecting plate 42, the front end of the negative pole electrode tab 6 extends out of the insulating support 2 to form a negative pole electrode tab connecting wing 62 for being electrically connected with the lithium battery cell, a negative pole electrode tab bending part 63 extending along the vertical direction is formed between the negative pole electrode tab connecting part 61 and the negative pole electrode tab connecting wing 62, and a negative pole electrode tab bending section 621 protruding upwards and bent by 180 degrees is formed on the negative pole electrode tab connecting wing 62; in this embodiment, the positive post electrode tab bending section 521 is provided to facilitate the bending of the positive post electrode tab connecting wing 52 during the installation process of the lithium battery cell, and the negative post electrode tab bending section 621 is similar.

Further, an insulating support protection box 21 is formed at the middle position of the insulating support 2 in the length direction, a support vent groove 211 is formed at the lower position right opposite to the pressure relief hole 11 on the bottom panel of the insulating support protection box 21, a telescopic groove 212 is formed at the front end and the rear end of the support vent groove 211, and a pair of anti-cracking telescopic feet 213 which can keep the insulating support in an integrated structure and help the insulating support protection box 21 to be telescopic are formed at the front edge and the rear edge of the insulating support protection box 21 in an inward concave manner; this insulating support protection box 21 makes insulating support 2's the left and right sides structure form the integral type disjunctor, has avoided insulating support 2 flexible deformation behind plastics injection moulding can make the central point of corresponding anodal post 3 and negative pole post 4 put deviation about and lead to the problem of equipment difficulty, and the flexible foot 213's of crack control setting can ensure insulating support 2 and rationally stretch out and draw back under high temperature or low temperature environment simultaneously, prevents that insulating support 2 from arching out of shape because of expend with heat and contract with cold, promotes the security.

Furthermore, a liquid injection hole 14 is formed in the cover plate body 1 at a position corresponding to a position between the pressure relief hole 11 and the positive post 3, the liquid injection hole 14 penetrates through the thickness direction of the cover plate body 1 and can be used for injecting an electrolyte into a shell cavity of a lithium battery shell through the liquid injection hole 14, and a liquid injection relief hole 22 is formed in the insulating support 2 at a position corresponding to a lower position of the liquid injection hole 14.

Preferably, the positive electrode tab 3 and the positive electrode tab 5 are made of aluminum, the negative electrode tab 4 is made of copper-aluminum composite, and the negative electrode tab 6 is made of red copper, and a potential difference is formed between the positive electrode tab 3 and the negative electrode tab 4 by an aluminum material and the copper-aluminum composite.

To sum up, the technical solution provided by the present invention overcomes the shortcomings in the prior art, successfully completes the invention task, and truly realizes the technical effects of the applicant in the technical effect column.

Claims (10)

1. A lithium battery cover plate with good protection effect comprises a cover plate body (1); an insulating support (2) positioned and mounted on the surface of the cover body (1) facing the lower side: the positive pole (3) and the negative pole (4) are respectively installed at the left end and the right end of the cover plate body (1) in a matched mode, the positive pole (3) and the cover plate body (1) are kept in an electric conduction state, and the negative pole (4) and the cover plate body (1) are kept in an electric insulation state; the method is characterized in that: the lithium battery comprises a lithium battery core, and is characterized by further comprising a positive pole electrode lead piece (5) and a negative pole electrode lead piece (6), wherein the positive pole electrode lead piece (5) and the negative pole electrode lead piece (6) are electrically connected with the lithium battery core, the positive pole electrode lead piece (5) is fixedly arranged at the lower position of the positive pole (3), and the negative pole electrode lead piece (6) is fixedly arranged at the lower position of the negative pole (4); a pressure relief hole (11) is formed in the middle of the cover plate body (1) in the length direction, the pressure relief hole (11) is of a waist-shaped hole structure and penetrates through the thickness direction of the cover plate body (1), a pressure relief explosion-proof mechanism (7) is arranged in the pressure relief hole (11), the pressure relief explosion-proof mechanism (7) comprises an explosion-proof film (71) and an explosion-proof protection adhesive film (72), the explosion-proof film (71) is installed at the bottom of the pressure relief hole (11) in a matching manner, the explosion-proof protection adhesive film (72) is attached to the upward side surface of the cover plate body (1) and covers the pressure relief hole (11), the shape of the explosion-proof protection adhesive film (72) is matched with that of the pressure relief hole (11), and semicircular positions at the left end and the right end of the explosion-proof protection adhesive film (72) are respectively provided with an exhaust hole (721) penetrating through the thickness direction, the two exhaust holes (721) are both in arc hole structure.

2. The lithium battery cover plate with good protection effect according to claim 1, wherein the peripheral edge of the explosion-proof membrane (71) of the pressure relief explosion-proof mechanism (7) is welded with the bottom of the inner side wall of the pressure relief hole (11), an explosion-proof sheet pressure-bearing cavity (711) protruding upwards is formed in the center of the explosion-proof membrane (71), and the explosion-proof sheet pressure-bearing cavity (711) is of a hemispherical structure.

3. The lithium battery cover plate with good protection effect as claimed in claim 1, wherein the explosion-proof film (71) is made of aluminum foil, and the explosion-proof protective film (72) is made of PET material and is in a transparent state.

4. The lithium battery cover plate with good protection effect according to claim 1, characterized in that a positive post conducting sleeve positioning hole (12) penetrating through the cover plate body (1) in the thickness direction is formed at the left end of the cover plate body (1) and at a position corresponding to the positive post (3), a positive post conducting sleeve (121) is fittingly installed in the positive post conducting sleeve positioning hole (12), the positive post (3) comprises a positive post clamping cylinder (31) and a positive post connecting plate (32) formed at the lower end of the positive post clamping cylinder (31), the positive post clamping cylinder (31) penetrates through the insulating support (2) from the lower part of the insulating support (2) and is arranged in the positive post conducting sleeve (121) in a penetrating manner, and the positive post clamping cylinder (31) and the positive post conducting sleeve (121) are fittingly installed together, at least part of the positive post (3) and the cover plate body (1) are electrically connected through a positive post conducting sleeve (121); the right-hand member of apron body (1) and corresponding to position department of negative pole post (4) sets up a negative pole post insulation cover locating hole (13) that runs through apron body (1) thickness direction, and a negative pole post insulation cover (131) are installed in the cooperation in this negative pole post insulation cover locating hole (13), and negative pole post (4) are including a negative pole post joint cylinder (41) and constitute negative pole post connecting plate (42) at this negative pole post joint cylinder (41) lower extreme equally, negative pole post joint cylinder (41) are also followed the below of insulating support (2) is passed this insulating support (2) and is worn to establish in negative pole post insulation cover (131), and this negative pole post joint cylinder (41) and negative pole post insulation cover (131) cooperation are installed together and keep electrical insulation state rather than.

5. The lithium battery cover plate with good protection effect according to claim 4, wherein a positive post sealing member (33) is arranged between the positive post clamping cylinder (31) of the positive post (3) and the insulating bracket (2) and at a position corresponding to the middle between the positive post connecting plate (32) and the cover plate body (1), and the positive post sealing member (33) is sleeved on the positive post clamping cylinder (31); similarly, a negative pole column sealing piece (43) is arranged between the negative pole column clamping cylinder (41) of the negative pole column (4) and the insulating support (2) and at a position corresponding to the middle of the negative pole column connecting plate (42) and the cover plate body (1), and the negative pole column sealing piece (43) is also sleeved on the negative pole column clamping cylinder (41).

6. The lithium battery cover plate with good protection effect according to claim 4, wherein a positive post conducting sleeve indication plate (1211) which is fittingly installed on the upward-facing side surface of the cover plate body (1) is formed on the positive post conducting sleeve (121), and a power positive identification mark (1212) is arranged on the upward-facing side surface of the positive post conducting sleeve indication plate (1211); similarly, a negative pole conductive sleeve indication plate (1311) fitted on the upward-facing surface of the cover plate body (1) is also formed on the negative pole insulating sleeve (131), and a power negative pole identification mark (1312) is provided on the upward-facing surface of the negative pole conductive sleeve indication plate (1311).

7. The lithium battery cover plate with good protection effect as claimed in claim 4, wherein the positive electrode tab (5) has a positive electrode tab connecting portion (51) disposed in a horizontal state, the positive pole electrode lead sheet connecting part (51) is welded and fixed with the positive pole connecting plate (32) of the positive pole (3), the front end of the positive pole electrode lead piece (5) extends out of the insulating bracket (2) to form a positive pole electrode lead piece connecting wing (52) which is electrically connected with the lithium battery core, a positive pole electrode lead piece bending part (53) which extends along the vertical direction is formed between the positive pole electrode lead piece connecting part (51) and the positive pole electrode lead piece connecting wing (52), and a positive post electrode lead tab bending section (521) which is convex upwards and is prefabricated for 180 degrees is formed on the positive post electrode lead tab connecting wing (52); the negative pole lead piece (6) is provided with a negative pole lead piece connecting part (61) which is arranged in a horizontal state, the negative pole lead piece connecting part (61) is welded and fixed with the negative pole connecting plate (42), the front end of the negative pole lead piece (6) extends out of the insulating support (2) to form a negative pole lead piece connecting wing (62) which is electrically connected with a lithium battery cell, a negative pole lead piece bending part (63) which extends along the vertical direction is formed between the negative pole lead piece connecting part (61) and the negative pole lead piece connecting wing (62), and a negative pole lead piece bending section (621) which is upwards raised and is bent by 180 degrees in advance is formed on the negative pole lead piece connecting wing (62).

8. The lithium battery cover plate with good protection effect as claimed in claim 1, wherein an insulating support protection box (21) is formed at a middle position of the insulating support (2) in a length direction, a support vent groove (211) is formed on a bottom panel of the insulating support protection box (21) and at a position right below the pressure relief hole (11), a telescopic groove (212) is formed at each of front and rear ends of the support vent groove (211), and a pair of anti-cracking telescopic legs (213) which enable the insulating support to maintain an integrated structure and help the insulating support (2) to stretch and retract are formed at front and rear edges of the insulating support protection box (21) by being recessed inward.

9. The lithium battery cover plate with good protection effect according to claim 1, characterized in that a liquid injection hole (14) is formed in the cover plate body (1) at a position corresponding to the pressure relief hole (11) and the position between the positive posts (3), the liquid injection hole (14) penetrates through the thickness direction of the cover plate body (1) and can be used for injecting electrolyte into a shell cavity of a lithium battery shell through the liquid injection hole (14), and a liquid injection yielding hole (22) is formed in the insulating support (2) at a position corresponding to the lower part of the liquid injection hole (14).

10. The lithium battery cover plate with good protection effect as claimed in claim 1, wherein the positive post (3) and the positive post electrode tab (5) are made of aluminum, the negative post (4) is made of copper-aluminum composite material, and the negative post electrode tab (6) is made of red copper.

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