阅读说明：本技术 锂离子电池钢壳及提高钢壳注液效率的方法 (Lithium ion battery steel shell and method for improving liquid injection efficiency of steel shell ) 是由 郭密 孙世敏 王珍珍 陈述林 赵川 吴国强 万里鹏 徐鲲 曾素琼 兰水静 于 2020-12-24 设计创作，主要内容包括：本发明涉及锂离子电池的技术领域,公开了锂离子电池钢壳及提高钢壳注液效率的方法。所述锂离子电池钢壳包括钢壳本体,所述钢壳本体内的上部侧壁上固定有固定圈,所述固定圈的下部设置有连接罩,所述连接罩的下部延伸至钢壳本体内的下部,所述连接罩的外壁上均匀设置有多个通气口,且在所述连接罩的下部外壁上套设有浮动垫,所述钢壳本体的通口外壁上设置有密封圈,所述密封圈内设置有排气机构,所述排气机构的一端连接钢壳本体内部,且另一端依次穿过固定圈、密封圈、钢壳本体侧壁与外部相连通。本发明通过设置的排气机构能够在注液时实时进行排气,同时设置的浮动垫能够随着注液高度进行移动,对上部的空气实现排压,提高出气效率。(The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery steel shell and a method for improving liquid injection efficiency of the steel shell. The lithium ion battery steel casing includes the steel casing body, be fixed with the retainer plate on this internal upper portion lateral wall of steel casing, the lower part of retainer plate is provided with the connecting cover, the lower part of connecting cover extends to this internal lower part of steel casing, evenly be provided with a plurality of blow vents on the outer wall of connecting cover, just the cover is equipped with the pad that floats on the lower part outer wall of connecting cover, be provided with the sealing washer on the opening outer wall of steel casing body, be provided with exhaust mechanism in the sealing washer, inside the steel casing body was connected to exhaust mechanism's one end, and the other end passes retainer plate, sealing washer, steel casing body lateral wall and outside in proper order and is linked together. The air exhaust mechanism can exhaust air in real time during liquid injection, and the floating cushion can move along with the height of the liquid injection, so that the upper air is exhausted, and the air exhaust efficiency is improved.)

1. Lithium ion battery steel casing, its characterized in that, including the steel casing body, be fixed with the retainer plate on this internal upper portion lateral wall of steel casing, the lower part of retainer plate is provided with the connecting cover, the lower part of connecting cover extends to this internal lower part of steel casing, evenly be provided with a plurality of blow vents on the outer wall of connecting cover, just the cover is equipped with the pad that floats on the lower part outer wall of connecting cover, be provided with the sealing washer on the opening outer wall of steel casing body, be provided with exhaust mechanism in the sealing washer, inside the steel casing body was connected to exhaust mechanism's one end, and the other end passes retainer plate, sealing washer, steel casing body lateral wall and outside in proper order and is linked together.

2. The steel shell for lithium ion batteries according to claim 1, wherein the lower part of the connecting cover and the bottom end inside the steel shell body are provided with a gap, and the width of the gap is smaller than that of the floating pad.

3. The steel shell for lithium ion batteries according to claim 2, wherein the steel shell body above the fixing ring is provided with a liquid injection port, the liquid injection port is provided with an aluminum sheet, and the edge of the aluminum sheet abuts against the inner wall of the sealing ring.

4. The steel shell for lithium ion batteries according to claim 3, wherein the explosion-proof sheet is provided on the upper part of the aluminum sheet, and the explosion-proof sheet is bent downward and fixed at the edge on the inner wall of the sealing ring.

5. The steel shell for lithium ion batteries according to claim 4, wherein the top cover is arranged on the upper part of the explosion-proof sheet, and the lower side of the edge of the top cover is in contact with the explosion-proof sheet.

6. The steel shell for the lithium ion battery of claim 5, wherein the exhaust mechanism comprises vent grooves arranged at two sides of the bottom end of the fixing ring, the upper part of each vent groove is communicated with an exhaust hole, and the tail end of each exhaust hole is communicated with a connecting pipe.

7. The steel casing for lithium ion battery according to claim 6, wherein one end of the connecting pipe penetrates into the inside of the sealing ring, and the tail end extends to the outside through the side wall of the steel casing body.

8. The steel shell for the lithium ion battery of claim 7, wherein an air outlet filter plate is arranged on the outer side wall of the steel shell body, and the air outlet filter plate is movably and hermetically connected with the tail end of the connecting pipe.

9. The steel shell for lithium ion batteries according to claim 8, wherein a filter screen is arranged on the air outlet filter plate, and the diameter of the through hole on the filter screen is 0.01-0.05 mm.

10. The method for improving the liquid injection efficiency of the steel shell is characterized by comprising the following steps of using the lithium ion battery steel shell as defined in any one of claims 1 to 9:

s1: the external liquid injection cavity is aligned to the liquid injection port of the steel shell body and starts to inject liquid, and electrolyte liquid can directly fall into the steel shell body from the notch in the middle of the connecting cover and flows out of the connecting cover from the gap;

s2: at the moment, the floating pad rises under the action of buoyancy, meanwhile, the electrolyte and the floating pad continuously push the air in the steel shell body to rise, and the rising air is continuously discharged out of the steel shell body from the exhaust mechanism, so that the liquid injection efficiency of the steel shell is improved;

s3: the vent realizes the communication between the inside of the connecting cover and the steel shell body, and continuously exhausts the internal air when the electrolyte and the floating pad continuously rise, so that the liquid injection efficiency is continuously improved;

s4: finally, the floating pad rises to abut against the fixed ring, so that the vent groove of the exhaust mechanism is blocked, and the exhaust of the exhaust mechanism is interrupted, so that the electrolyte liquid is prevented from being sprayed out of the exhaust mechanism;

s5: the air outlet filter plate arranged on the exhaust mechanism can prevent external dust from entering the connecting pipe, so that the dust is prevented from falling into the connecting pipe, the air outlet filter plate is disassembled after the top cover on the steel shell body is installed, and finally the tail end of the connecting pipe is subjected to sealing treatment, so that the liquid injection operation of the lithium ion battery steel shell is completed.

Technical Field

The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery steel shell and a method for improving liquid injection efficiency of the steel shell.

Background

The increase in energy density has been one of the directions in which practitioners of lithium ion batteries are constantly striving. The high nickel anode material and the silicon cathode material are the necessary way for improving the energy density of the lithium ion battery. Because of the characteristic problems of the anode high-nickel material and the silicon cathode material, the compacted thickness of the anode and the cathode is in a thicker level, so that the size of the battery cell is larger, the gap between the battery cell and the steel shell is smaller, liquid injection is difficult, and the production efficiency is reduced. And the longer the liquid injection time is, the easier the moisture is introduced, and in addition to the problem of gas generation of the anode high-nickel material and the silicon cathode material, the battery core is easy to lose effectiveness due to the CID overturn of the cap caused by the gas generation problem.

Aiming at the technical problems, the current common means in the industry aims to improve the space allowance of the battery cell by reducing the compaction thickness of the positive and negative electrodes so as to achieve the purpose of improving the liquid injection efficiency, but the excessive reduction of the compaction thickness of the positive electrode easily causes the breakage of the positive plate so as to cause the overlarge internal resistance of the battery cell, and the excessive reduction of the compaction thickness of the negative electrode easily causes the material falling of the local area of the negative plate so as to cause the safety failure problem of the battery cell caused by lithium precipitation.

In addition, the problem of improving the liquid injection efficiency is achieved by prolonging the negative pressure time in the liquid injection process, but the negative pressure time is prolonged, so that air in the electric core is sucked out, and part of electrolyte is sucked out, so that the loss of the electrolyte is increased, and the depreciation of equipment caused by the corrosion of the electrolyte is accelerated.

Therefore, the gas generated in the subsequent formation of the introduced water in the cylindrical battery cell due to the low liquid injection efficiency cannot be discharged, which becomes a big pain point restricting the rapid popularization and application of the high-nickel anode material and the silicon cathode material in the cylindrical battery cell.

Disclosure of Invention

The invention aims to provide a lithium ion battery steel shell, which can exhaust in real time during liquid injection through an exhaust mechanism so as to increase the liquid injection efficiency, and meanwhile, a floating pad arranged can move along with the liquid injection height to discharge pressure to the air at the upper part and improve the gas outlet efficiency.

The invention discloses a lithium ion battery steel shell which comprises a steel shell body, wherein a fixing ring is fixed on the upper side wall in the steel shell body, a connecting cover is arranged at the lower part of the fixing ring, the lower part of the connecting cover extends to the lower part in the steel shell body, a plurality of air vents are uniformly arranged on the outer wall of the connecting cover, a floating pad is sleeved on the outer wall of the lower part of the connecting cover, a sealing ring is arranged on the outer wall of an opening of the steel shell body, an exhaust mechanism is arranged in the sealing ring, one end of the exhaust mechanism is connected with the inside of the steel shell body, and the other end of the exhaust mechanism sequentially penetrates through the fixing ring, the sealing ring and the side wall of the steel shell body to.

Further, a gap is formed between the lower portion of the connecting cover and the bottom end inside the steel shell body, and the width of the gap is smaller than that of the floating pad.

Furthermore, be provided with on the steel-shelled body of retainer plate top and annotate the liquid mouth, it is provided with the aluminum sheet on the liquid mouth to annotate, aluminum sheet border and sealing washer inner wall looks butt.

Furthermore, the upper portion of aluminum sheet is provided with the explosion-proof piece, the explosion-proof piece downwarping and edge fixing are on the sealing washer inner wall.

Further, the upper portion of explosion-proof piece is provided with the top cap, the marginal downside of top cap contacts with the explosion-proof piece.

Furthermore, the exhaust mechanism comprises vent grooves arranged on two sides of the bottom end of the fixing ring, the upper parts of the vent grooves are communicated with exhaust holes, and the tail ends of the exhaust holes are communicated with connecting pipes.

Furthermore, one end of the connecting pipe penetrates into the sealing ring, and the tail end of the connecting pipe penetrates through the side wall of the steel shell body and extends to the outside.

Further, an air outlet filter plate is arranged on the outer side wall of the steel shell body and is movably and hermetically connected with the tail end of the connecting pipe.

Furthermore, a filter screen is arranged on the air outlet filter plate, and the diameter of a through hole in the filter screen is 0.01-0.05 mm.

Compared with the prior art, the lithium ion battery steel shell provided by the invention has the following beneficial effects:

1. the air exhaust mechanism can exhaust air in real time during liquid injection, so that the liquid injection efficiency is increased, meanwhile, the floating pad can move along with the liquid injection height, pressure discharge is realized on the air at the upper part, the air outlet efficiency is improved, and when the liquid is fully injected, the upper part of the floating pad directly abuts against the fixed ring, so that the interruption of the air exhaust mechanism is realized, the leakage of electrolyte is avoided, the operation is convenient and fast, and the liquid injection efficiency of the lithium ion battery steel shell is greatly improved;

2. through the liquid injection method that utilizes the lithium ion battery box hat for the inside gas of box hat body is discharged fast, and exhaust mechanism can prevent that the dust from getting into inside, also can indicate simultaneously that annotate the liquid and accomplish, and can dismantle the filter plate of giving vent to anger after annotating the liquid and accomplish, and seal the connecting pipe, guarantee that electrolyte can not flow, the filter plate of giving vent to anger after the dismantlement can used repeatedly, greatly reduced annotate the liquid cost.

The method for improving the liquid injection efficiency of the steel shell comprises the following specific steps:

s1: the external liquid injection cavity is aligned to the liquid injection port of the steel shell body and starts to inject liquid, and electrolyte liquid can directly fall into the steel shell body from the notch in the middle of the connecting cover and flows out of the connecting cover from the gap;

s2: at the moment, the floating pad rises under the action of buoyancy, meanwhile, the electrolyte and the floating pad continuously push the air in the steel shell body to rise, and the rising air is continuously discharged out of the steel shell body from the exhaust mechanism, so that the liquid injection efficiency of the steel shell is improved;

s3: the vent realizes the communication between the inside of the connecting cover and the steel shell body, and continuously exhausts the internal air when the electrolyte and the floating pad continuously rise, so that the liquid injection efficiency is continuously improved;

s4: finally, the floating pad rises to abut against the fixed ring, so that the vent groove of the exhaust mechanism is blocked, and the exhaust of the exhaust mechanism is interrupted, so that the electrolyte liquid is prevented from being sprayed out of the exhaust mechanism;

s5: the air outlet filter plate arranged on the exhaust mechanism can prevent external dust from entering the connecting pipe, so that the dust is prevented from falling into the connecting pipe, the air outlet filter plate is disassembled after the top cover on the steel shell body is installed, and finally the tail end of the connecting pipe is subjected to sealing treatment, so that the liquid injection operation of the lithium ion battery steel shell is completed.

Drawings

FIG. 1 is a structural cross-sectional view of a lithium ion battery steel case provided by the invention before liquid injection;

FIG. 2 is a structural sectional view of the lithium ion battery steel shell during liquid injection;

FIG. 3 is an enlarged view of the structure of the area A in FIG. 1;

fig. 4 is a structural plan view of a fixing ring in a steel shell of a lithium ion battery according to the present invention.

In the figure: 1-steel shell body, 2-fixed ring, 3-connecting cover, 4-vent, 5-floating pad, 6-sealing ring, 7-liquid injection port, 8-aluminum sheet, 9-explosion-proof sheet, 10-top cover, 11-exhaust mechanism, 12-vent groove, 13-exhaust hole, 14-connecting pipe, 15-air outlet filter plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Referring to fig. 1-4, preferred embodiments of the present invention are shown.

The lithium ion battery steel shell comprises a steel shell body 1, wherein a fixing ring 2 is fixed on the upper side wall in the steel shell body 1, a connecting cover 3 is arranged at the lower part of the fixing ring 2, the lower part of the connecting cover 3 extends to the lower part in the steel shell body 1, a plurality of air vents 4 are uniformly arranged on the outer wall of the connecting cover 3, a floating pad 5 is sleeved on the outer wall of the lower part of the connecting cover 3, a sealing ring 6 is arranged on the outer wall of an opening of the steel shell body 1, an exhaust mechanism 11 is arranged in the sealing ring 6, one end of the exhaust mechanism 11 is connected with the inside of the steel shell body 1, the other end of the exhaust mechanism sequentially penetrates through the fixing ring 2, the sealing ring 6 and the side wall of the steel shell body 1 to be communicated with the outside, the exhaust mechanism 11 can exhaust in real time during liquid injection, so that the liquid injection efficiency is increased, and meanwhile, the air outlet efficiency is improved, and when the liquid is filled, the upper part of the floating pad 5 is directly abutted against the fixing ring 2, so that the interruption of the exhaust mechanism 11 is realized, and the electrolyte is prevented from leaking.

In this embodiment, the lower part of connecting cover 3 and the inside bottom of steel-shelled turtle shell body 1 are provided with the clearance, and the width in clearance is less than floating pad 5, and the clearance is guaranteed that electrolyte can flow out to steel-shelled turtle shell body 1 from connecting cover 3 is inside.

In this embodiment, be provided with on the steel-shelled turtle shell body 1 of retainer plate 2 top and annotate liquid mouth 7, be provided with aluminum sheet 8 on annotating liquid mouth 7, aluminum sheet 8 border and 6 inner wall looks butt of sealing washer, the upper portion of aluminum sheet 8 is provided with explosion-proof piece 9, explosion-proof piece 9 downwarping and edge fastening are on 6 inner walls of sealing washer, the upper portion of explosion-proof piece 9 is provided with top cap 10, the marginal downside of top cap 10 contacts with explosion-proof piece 9, explosion-proof piece 9 avoids the battery explosion, top cap 10 realizes the inside closure of steel-shelled turtle shell.

In this embodiment, the exhaust mechanism 11 includes vent grooves 12 disposed at both sides of the bottom end of the fixed ring 2, the upper portion of the vent groove 12 is communicated with an exhaust hole 13, the end of the exhaust hole 13 is communicated with a connecting pipe 14, one end of the connecting pipe 14 penetrates into the sealing ring 6, and the end penetrates through the side wall of the steel shell body 1 and extends to the outside, an air outlet filter plate 15 is disposed on the outer side wall of the steel shell body 1, the air outlet filter plate 15 is movably and hermetically connected with the end of the connecting pipe 14, a filter screen is disposed on the air outlet filter plate 14, the diameter of a through hole on the filter screen is 0.01-0.05mm, the exhaust mechanism 11 can prevent dust from entering the inside, and can also prompt that liquid injection is completed, and the air outlet filter plate 15 can be detached after liquid injection is completed;

specifically, can exhaust in real time when annotating liquid through the exhaust mechanism 11 that sets up to increase and annotate liquid efficiency, the floating pad 5 that sets up simultaneously can be along with annotating liquid height and remove, realize the pressure of arranging to the air on upper portion, improve the efficiency of giving vent to anger, and when annotating full liquid, the upper portion of floating pad 5 directly supports on retainer plate 2, realized exhaust mechanism 11's interrupt, avoid electrolyte to leak, the simple operation has promoted the notes liquid efficiency of lithium ion battery box hat greatly.

The method for improving the liquid injection efficiency of the steel shell comprises the following specific steps:

s1: the external liquid injection cavity is aligned to the liquid injection port 7 of the steel shell body 1 and starts to inject liquid, and electrolyte liquid can directly fall into the steel shell body 1 from the notch in the middle of the connecting cover 3 and flows out of the connecting cover 3 from the gap;

s2: at the moment, the floating pad 5 rises under the action of buoyancy, meanwhile, the electrolyte liquid and the floating pad 5 continuously push the air in the steel shell body 1 to rise, and the rising air is continuously discharged out of the steel shell body 1 from the exhaust mechanism 11, so that the liquid injection efficiency of the steel shell is improved;

s3: the vent 4 realizes the communication between the inside of the connecting cover 3 and the steel shell body 1, and continuously exhausts the internal air when the electrolyte and the floating pad 5 continuously rise, so that the liquid injection efficiency is continuously improved;

s4: finally, the floating pad 5 is lifted to abut against the fixed ring 2, so that the vent groove 12 of the exhaust mechanism 11 is blocked, and the exhaust of the exhaust mechanism 11 is interrupted, so that the electrolyte liquid is prevented from being sprayed out of the exhaust mechanism 11;

s5: the air outlet filter plate 15 arranged on the exhaust mechanism 11 can prevent external dust from entering the connecting pipe 14, so that the dust is prevented from falling into the connecting pipe 14, the air outlet filter plate 15 is disassembled after the top cover 10 on the steel shell body 1 is installed, and finally the tail end of the connecting pipe 14 is subjected to sealing treatment, so that the liquid injection operation of the lithium ion battery steel shell is completed.

Specifically, through the liquid injection method that utilizes the lithium ion battery steel casing for the inside gas of steel casing body 1 discharges fast, and exhaust mechanism 11 can prevent that the dust from getting into inside, also can indicate simultaneously that annotates the liquid and has accomplished, and can dismantle the filter plate 15 of giving vent to anger after annotating the liquid and accomplish, and seal connecting pipe 14, guarantee that electrolyte can not flow out, the filter plate 14 of giving vent to anger after the dismantlement can used repeatedly, greatly reduced annotate the liquid cost.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.