CN108110188B

CN108110188B - Explosion-proof lithium battery with good heat dissipation performance

Info

Publication number: CN108110188B
Application number: CN201711336777.5A
Authority: CN
Inventors: 王伟
Original assignee: Super Capacity New Energy Technology Co ltd
Current assignee: Super capacity New Energy Technology Co.,Ltd.
Priority date: 2017-12-14
Filing date: 2017-12-14
Publication date: 2020-11-20
Anticipated expiration: 2037-12-14
Also published as: CN108110188A

Abstract

The invention discloses an explosion-proof lithium battery with good heat dissipation performance, which comprises a shell, wherein a cover body is fixedly connected onto the shell, an electric core is arranged in the shell, an anode connector and a cathode connector are arranged on the electric core, the anode connector and the cathode connector both penetrate through the cover body, a containing groove is formed in the shell, spring fasteners are symmetrically arranged on the inner walls of two ends of the containing groove, the two spring fasteners are jointly clamped with a fixed block, a heat dissipation frame is integrally formed at the upper end of the fixed block, one end, far away from the cover body, of the heat dissipation frame is fixedly connected with a separation blade, the anode connector and the cathode connector both penetrate through the separation blade, an explosion-proof device is arranged on the side wall of the shell, and an explosion-proof cavity is formed in the explosion. The lithium battery explosion-proof device has the advantages of stable structure, simple operation, scientific and reasonable design, short production period, low manufacturing cost, good heat dissipation performance, convenience in disassembly, good explosion-proof performance, adjustable explosion-proof strength, safer lithium battery and high popularization value.

Description

Explosion-proof lithium battery with good heat dissipation performance

Technical Field

The invention relates to the technical field of lithium batteries, in particular to an explosion-proof lithium battery with good heat dissipation performance.

Background

A "lithium battery" is a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a negative electrode material. Because the chemical characteristics of lithium metal are very active, the requirements on the environment for processing, storing and using the lithium metal are very high. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainstream nowadays. Lithium, atomic number 3, atomic weight 6.941, is the lightest alkali metal element.

After the lithium battery core is overcharged to a voltage higher than 4.2V, side effects can begin to be generated. The higher the overcharge voltage, the higher the danger. When the voltage of the lithium cell is higher than 4.2V, the quantity of lithium atoms left in the anode material is less than half, at the moment, the storage lattice is always collapsed, and the battery capacity is permanently reduced. If charging is continued, since the storage cells of the negative electrode are already filled with lithium atoms, subsequent lithium metal may be deposited on the surface of the negative electrode material. These lithium atoms grow dendrites from the surface of the negative electrode toward lithium ions. These lithium metal crystals may penetrate the separator paper to short-circuit the positive and negative electrodes. Sometimes, the battery explodes before the short circuit occurs because the electrolyte and other materials are cracked to generate gas in the overcharge process, so that the battery shell or the pressure valve is swelled and broken, oxygen enters to react with lithium atoms accumulated on the surface of the negative electrode, and the battery explodes. Therefore, when charging a lithium battery, the upper limit of the voltage must be set to simultaneously achieve the life, capacity, and safety of the battery. The optimal upper limit of the charging voltage is 4.2V. The lithium battery cell also has a lower voltage limit when discharging. When the cell voltage is lower than 2.4V, part of the material can start to be damaged. Since the battery is self-discharged and the voltage is lower the longer the battery is discharged, it is preferable that the discharge is not stopped until 2.4V is reached. During the period of discharging the lithium battery from 3.0V to 2.4V, the released energy only accounts for about 3 percent of the battery capacity. Therefore, 3.0V is an ideal discharge cutoff voltage. In addition to voltage limitation, current limitation is also necessary in charging and discharging. When the current is too large, lithium ions have no time to enter the storage cells and are accumulated on the surface of the material. These lithium ions, after taking up electrons, can produce lithium atom crystals on the surface of the material, which, like overcharging, can pose a risk. In case the battery case is broken, it explodes. Therefore, the protection of the lithium ion battery at least comprises: the charging voltage upper limit, the discharging voltage lower limit and the current upper limit. In general, a lithium battery pack has a protective plate except for a lithium battery cell, and the protective plate mainly provides three protection items. When designing a battery system, two electronic protections must be provided for overcharge, overdischarge, and overcurrent, respectively. The protection plate is removed and charged, and if the battery explodes, the design is poor. Although the above method provides two protections, consumers often buy non-original chargers to charge after the chargers are broken, and charger manufacturers often take away the charging controllers to reduce costs based on cost considerations. As a result, inferior coins expel good coins, and many inferior chargers appear on the market. This results in the loss of the first line of defense, also the most important line of defense, from overcharge protection. Overcharging is the most important factor causing battery explosion, and thus, a poor charger can be called as the very fierce battery explosion event. Of course, not all battery systems employ the above scheme. In some cases, there will also be a charge controller design within the battery pack.

However, these three protections of the protection plate are obviously insufficient, and the lithium battery needs to have good heat dissipation performance, and an explosion-proof device is arranged outside the lithium battery, so that if the electronic protection measures are all failed, when explosion is about to occur, the explosion hazard can be reduced through the explosion-proof device, and the damage can be reduced to the minimum.

Disclosure of Invention

The invention aims to solve the problem that a lithium battery in the prior art is poor in heat dissipation and explosion-proof performance, and provides an explosion-proof lithium battery with good heat dissipation performance.

In order to achieve the purpose, the invention adopts the following technical scheme:

an explosion-proof lithium battery with good heat dissipation performance comprises a shell, wherein a cover body is fixedly connected to the shell, an electric core is installed in the shell, an anode joint and a cathode joint are installed on the electric core, the anode joint and the cathode joint penetrate through the cover body, a containing groove is formed in the shell, spring fasteners are symmetrically installed on the inner walls of two ends of the containing groove, the two spring fasteners are clamped with a fixed block together, a heat dissipation frame is integrally formed at the upper end of the fixed block, a baffle is fixedly connected to one end of the heat dissipation frame, which is far away from the cover body, the anode joint and the cathode joint penetrate through the baffle, an explosion-proof device is installed on the side wall of the shell, an explosion-proof cavity is formed in the explosion-proof device and communicated with the shell, a first opening is formed in the inner wall of the explosion-proof cavity, and sliding grooves are formed in the upper inner wall and the lower, two the common sliding connection of spout has the explosion-proof board, a plurality of second openings have been seted up on the explosion-proof board, vertical fixedly connected with baffle on the inner wall in explosion-proof chamber, the third opening has been seted up on the baffle, install a plurality of bearings on the baffle, the bearing interpolation is equipped with the lead screw, the one end threaded connection that the lead screw is close to electric core has the connecting block, the one end welding that the lead screw was kept away from to the connecting block has powerful spring, the through-hole has been seted up with the position that the lead screw corresponds on the explosion-proof board, the lead screw runs through the through-hole, the pot head that the connecting block was kept away from to the lead screw is equipped with the worm wheel, the worm wheel meshing has the worm, the one end of worm is rotated and is connected on.

Preferably, a plurality of heat dissipation fins are fixedly connected to the heat dissipation frame at equal intervals.

Preferably, a nut is installed on the connecting block, and the connecting block is in threaded connection with the screw rod through the nut.

Preferably, the spring is drawn and is detained and comprises mutually welded reset spring and fixture block, the draw-in groove has all been seted up on the both ends inner wall of accomodating the groove, the welding has reset spring on the inner wall of draw-in groove, the wire casing has been seted up on the inner wall of draw-in groove, install the fixed pulley on the inner wall of wire casing, the welding has the lewis hole on the fixture block, fixedly connected with rope body on the lewis hole, rope body passes fixed pulley and fixedly connected with pull ring.

Preferably, the rope body is a steel wire rope.

Preferably, a groove is formed in the position, corresponding to the fixture block, of the fixing block, and the width of the groove is equal to that of the fixture block.

Preferably, a linear bearing is installed in the through hole and is in sliding connection with the screw rod.

Preferably, the screw rod is in interference fit with the worm gear through a flat key.

In the invention, when the electric core of the lithium battery is ready to explode, the electric core of the lithium battery expands, the expansion gas further presses against the explosion-proof plate, the explosion-proof plate drives the strong spring to compress, the explosion-proof plate continuously slides in the chute after the strong spring is compressed and is separated from the sealing state of the partition plate, so that the second opening is communicated with the third opening and is finally communicated with the first opening, the expansion gas generated by explosion is discharged, thereby avoiding explosion hazard, and the explosion-proof strength can be adjusted, the knob is rotated, the knob drives the worm fixedly connected with the knob to rotate, the worm drives the worm wheel meshed with the worm wheel to rotate, the worm wheel drives the lead screw fixedly connected with the worm wheel to rotate, the lead screw rotates through the bearing and drives the connecting block in threaded connection with the lead screw to move, thereby adjusting the compression strength of the strong spring, and controlling the explosion-proof strength by controlling the compression strength of, when the dust on the heat dissipation frame is many, can dismantle the deashing, the pulling ring drives the rope body motion, and rope body pulling fixture block motion to make the fixed block can extract, thereby conveniently carry out the deashing, thereby heighten the radiating effect. The lithium battery explosion-proof device has the advantages of stable structure, simple operation, scientific and reasonable design, short production period, low manufacturing cost, good heat dissipation performance, convenience in disassembly, good explosion-proof performance, adjustable explosion-proof strength, safer lithium battery and high popularization value.

Drawings

Fig. 1 is a schematic structural diagram of an explosion-proof lithium battery with good heat dissipation performance according to the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is an enlarged structural schematic view of a part of an explosion-proof plate of an explosion-proof lithium battery with good heat dissipation performance according to the present invention;

fig. 4 is a side view of an explosion-proof lithium battery with good heat dissipation performance according to the present invention.

In the figure: the explosion-proof device comprises a shell 1, a cell 2, a positive electrode connector 3, a negative electrode connector 4, a heat dissipation frame 5, a blocking piece 6, a cover body 7, a fixing block 8, a clamping block 9, a return spring 10, a clamping groove 11, a rope body 12, a fixed pulley 13, a wire groove 14, a pull ring 15, a knob 16, a sliding groove 17, a through hole 18, a bearing 19, a worm 20, a second opening 21, an explosion-proof device 22, a worm wheel 23, an explosion-proof plate 24, a partition plate 25, a first opening 26, an explosion-proof cavity 27, a screw rod 28, a connecting block 29, a strong spring 30 and a third opening 31.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise specifically stated or limited, the terms "cover", "fitted", "attached", "fixed", "distributed", and the like are to be understood in a broad sense, and may be, for example, fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1-4, an explosion-proof lithium battery with good heat dissipation performance comprises a casing 1, a cover 7 is fixedly connected to the casing 1, a battery cell 2 is installed in the casing 1, a positive electrode connector 3 and a negative electrode connector 4 are installed on the battery cell 2, the positive electrode connector 3 and the negative electrode connector 4 both penetrate through the cover 7, a storage groove is formed in the casing 1, spring fasteners are symmetrically installed on inner walls of two ends of the storage groove, a fixing block 8 is clamped between the two spring fasteners, the spring fasteners are composed of a reset spring 10 and a clamping block 9 which are welded to each other, a groove is formed in a position of the fixing block 8 corresponding to the clamping block 9, the width of the groove is equal to the width of the clamping block 9, the clamping block 9 can be clamped into the groove, so that the joinability is further increased, clamping grooves 11 are formed in inner walls of two ends of the storage groove, the reset spring 10 is welded to, the inner wall of the wire groove 14 is provided with a fixed pulley 13, the fixture block 9 is welded with a hanging hole, a rope body 12 is fixedly connected to the hanging hole, the rope body 12 is made of a steel wire rope, the steel wire rope is high in strength and durable, the rope body 12 penetrates through the fixed pulley 13 and is fixedly connected with a pull ring 15, and the spring pull buckle is convenient to operate and detach and clean the heat dissipation frame 5, so that the heat dissipation performance is improved;

according to the invention, a heat dissipation frame 5 is integrally formed at the upper end of a fixed block 8, a plurality of heat dissipation fins are fixedly connected to the heat dissipation frame 5 at equal distances, the heat dissipation fins can increase the heat dissipation performance of the heat dissipation frame 5, a blocking piece 6 is fixedly connected to one end, far away from a cover body 7, of the heat dissipation frame 5, a positive electrode connector 3 and a negative electrode connector 4 both penetrate through the blocking piece 6, an explosion-proof device 22 is installed on the side wall of a shell 1, an explosion-proof cavity 27 is formed in the explosion-proof device 22 and communicated with the shell 1, a first opening 26 is formed in the inner wall of the explosion-proof cavity 27, sliding grooves 17 are formed in the upper inner wall and the lower inner wall of the explosion-proof cavity 27, an explosion-proof plate 24 is connected to the two sliding grooves 17 in a sliding mode, a plurality of second openings 21;

in the invention, a third opening 31 is arranged on a partition plate 25, a plurality of bearings 19 are arranged on the partition plate 25, a screw rod 28 is inserted in each bearing 19, one end of the screw rod 28, which is close to an electric core 2, is in threaded connection with a connecting block 29, a nut is arranged on the connecting block 29, the connecting block 29 is in threaded connection with the screw rod 28 through the nut, the nut is low in cost, convenient to mount and stable in connection, one end of the connecting block 29, which is far away from the screw rod 28, is welded with a strong spring 30, a through hole 18 is arranged on an explosion-proof plate 24, which corresponds to the screw rod 28, the screw rod 28 penetrates through the through hole 18, a linear bearing is arranged in the through hole 18 and is in sliding connection with the screw rod 28, the linear bearing is convenient to mount and high in mechanical efficiency, a worm wheel 23 can be placed on one end of the screw rod 28, the connection is stable, the worm wheel 23 is meshed with the worm 20, one end of the worm 20 is rotatably connected to the inner wall of the explosion-proof cavity 27, and the other end of the worm 20 penetrates through the inner wall of the explosion-proof cavity 27 and is fixedly connected with the knob 16.

The explosion-proof device has good explosion-proof performance, when the electric core 2 of the lithium battery is ready to explode, the explosion-proof device expands, the expansion gas further presses the explosion-proof plate 24, the explosion-proof plate 24 drives the strong spring 30 to compress, the explosion-proof plate 24 continues to slide in the chute 17 after the strong spring 30 is compressed and is separated from the sealing state of the partition plate 25, so that the second opening 21 and the third opening 31 are communicated and are finally communicated with the first opening 26, the expansion gas generated by explosion is discharged, explosion hazard is avoided, the explosion-proof strength can be adjusted, the knob 16 is rotated, the knob 16 drives the worm 20 fixedly connected with the knob to rotate, the worm 20 drives the worm wheel 23 meshed with the worm wheel to rotate, the worm wheel 23 drives the lead screw 28 fixedly connected with the lead screw to rotate through the bearing 19 and drives the connecting block 29 in threaded connection with the lead screw to move, and the compression strength of the strong spring 30 is adjusted, thereby control explosion-proof intensity through the compression dynamics of control powerful spring 30, when the dust on heat dissipation frame 5 is many, can dismantle the deashing, pulling pull ring 15, pull ring 15 drive rope body 12 motion, and rope body 12 pulling fixture block 9 moves to make fixed block 8 can extract, thereby conveniently carry out the deashing, thereby heighten the radiating effect.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. An explosion-proof lithium battery with good heat dissipation performance comprises a shell (1) and is characterized in that a cover body (7) is fixedly connected onto the shell (1), an electric core (2) is installed in the shell (1), an anode connector (3) and a cathode connector (4) are installed on the electric core (2), the anode connector (3) and the cathode connector (4) both penetrate through the cover body (7), a containing groove is formed in the shell (1), spring fasteners are symmetrically installed on the inner walls of two ends of the containing groove, two spring fasteners are clamped with a fixing block (8) together, a heat dissipation frame (5) is integrally formed at the upper end of the fixing block (8), a separation blade (6) is fixedly connected to one end, far away from the cover body (7), of the heat dissipation frame (5), the separation blade (6) penetrates through both the anode connector (3) and the cathode connector (4), and an explosion-proof device (22) is installed on the side wall of the shell (1), an explosion-proof cavity (27) is formed in the explosion-proof device (22), the explosion-proof cavity (27) is communicated with the shell (1), a first opening (26) is formed in the inner wall of the explosion-proof cavity (27), sliding grooves (17) are formed in the upper inner wall and the lower inner wall of the explosion-proof cavity (27), the two sliding grooves (17) are jointly connected with an explosion-proof plate (24) in a sliding mode, a plurality of second openings (21) are formed in the explosion-proof plate (24), a partition plate (25) is vertically and fixedly connected to the inner wall of the explosion-proof cavity (27), a third opening (31) is formed in the partition plate (25), a plurality of bearings (19) are installed on the partition plate (25), a lead screw (28) is inserted into each bearing (19), a linear bearing is installed in each through hole (18), and the linear bearing is connected with the lead screw (28) in a sliding; lead screw (28) are close to one end threaded connection of electric core (2) has connecting block (29), the one end welding that lead screw (28) were kept away from in connecting block (29) has powerful spring (30), through-hole (18) have been seted up with the position that lead screw (28) correspond on explosion-proof board (24), lead screw (28) run through-hole (18), the pot head that connecting block (29) were kept away from in lead screw (28) is equipped with worm wheel (23), worm wheel (23) meshing has worm (20), the one end of worm (20) is rotated and is connected on the inner wall of explosion-proof chamber (27), the other end of worm (20) runs through inner wall and fixedly connected with knob (16) of explosion-proof chamber (27).

2. The explosion-proof lithium battery with good heat dissipation performance according to claim 1, wherein a plurality of heat dissipation fins are fixedly connected to the heat dissipation frame (5) at equal intervals.

3. The explosion-proof lithium battery with good heat dissipation performance according to claim 1, wherein a nut is mounted on the connecting block (29), and the connecting block (29) is in threaded connection with the lead screw (28) through the nut.

4. The explosion-proof lithium battery with good heat dissipation performance according to claim 1, wherein the spring fastener is composed of a return spring (10) and a clamping block (9) which are welded to each other, the inner walls of both ends of the accommodating groove are respectively provided with a clamping groove (11), the inner wall of the clamping groove (11) is welded with the return spring (10), the inner wall of the clamping groove (11) is provided with a wire slot (14), the inner wall of the wire slot (14) is provided with a fixed pulley (13), the clamping block (9) is welded with a hanging hole, the hanging hole is fixedly connected with a rope body (12), and the rope body (12) passes through the fixed pulley (13) and is fixedly connected with a pull ring (15).

5. The explosion-proof lithium battery with good heat dissipation performance according to claim 4, wherein the rope body (12) is a steel wire rope.

6. The explosion-proof lithium battery with good heat dissipation performance according to claim 4, wherein a groove is formed in the position of the fixing block (8) corresponding to the fixture block (9), and the width of the groove is equal to the width of the fixture block (9).

7. The lithium battery with good heat dissipation performance and explosion resistance as recited in claim 1, wherein the lead screw (28) is coupled with the worm wheel (23) in an interference fit manner through a flat key.