CN212113765U

CN212113765U - Battery and cover cap for battery

Info

Publication number: CN212113765U
Application number: CN202021141798.9U
Authority: CN
Inventors: 王赛; 曹胜龙; 王卫东
Original assignee: SHENZHEN EPT BATTERY CO Ltd
Current assignee: SHENZHEN EPT BATTERY CO Ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2020-12-08
Anticipated expiration: 2030-06-18

Abstract

The utility model relates to a battery and a cover cap for the battery, the cover cap comprises an upper cover and a lower cover, the edge parts of the upper cover and the lower cover are welded together, a containing space is formed between the upper cover and the lower cover, a rebound resilience explosion-proof block with a fixed position is arranged in the accommodating space, the height of the rebound explosion-proof block under the condition of no pressure is greater than or equal to the height of the accommodating space, the upper cover is provided with a liquid injection hole, the circle center of the explosion-proof hole of the lower cover is positioned on the central axis of the liquid injection hole, can add electrolyte in to the battery through this block, the utility model provides an in the battery among the prior art the unable sealed and poor problem of filling accuracy of electrolyte secondary filling process, ensure that electrolyte filling in-process battery is inside isolated with external environment, reinforcing leakproofness, the filling process is simple more accurate simultaneously, has promoted filling efficiency.

Description

Battery and cover cap for battery

Technical Field

The utility model relates to a battery technology field, specific battery and be used for block of battery that says so can add electrolyte to the battery is inside through the block.

Background

The electrolyte is a medium (with certain corrosivity) used by chemical batteries, electrolytic capacitors and the like, provides ions for normal work of the chemical batteries, ensures that chemical reactions generated in the work are reversible, is generally prepared from a special acidic substance and distilled water or an alkaline substance and distilled water according to a certain proportion, and can be gradually reduced due to electrolysis and evaporation in the charging and discharging processes of the storage battery, so that the electrolyte level is reduced. If the distilled water is not supplemented in time, the service life of the storage battery can be shortened, and the distilled water should be supplemented in time.

The cylindrical battery monomer mainly comprises an anode, a cathode, a diaphragm, an anode-cathode collector, a safety valve, an overcurrent protection device, an insulating part and a shell, wherein the interior of the cylindrical battery is filled with an electrolytic medium, the traditional cylindrical battery is mostly a disposable battery, after the battery is sealed and sealed, the electrolyte can not be supplemented for maintenance, along with the increase of the number of charging and discharging cycles, the electrolyte in the battery is less and less, finally the electrolyte on a pole piece and the diaphragm is dried up and the service life is ended, along with the rise of new energy sources, the use occasions of the battery are more and more, the traditional disposable battery can not be reused after being used, after being discarded, the internal medium is leaked after the shell is corroded, the environment is greatly polluted, therefore, in order to realize the recycling and reusing of the battery, the rechargeable battery is plentiful, and the electrolyte is gradually reduced after the rechargeable battery is used for, the performance of the battery is gradually reduced, and the battery needs to be subjected to liquid supplementing operation frequently to ensure the working performance of the battery in repeated use.

Chinese patent document CN2583815 discloses a cylindrical lithium ion battery seal, which is formed by pressing a seal ring, a positive plate, a thermistor sheet, a cover plate, an explosion-proof block, a cap and the like into a battery upper opening casing in sequence, and then mechanically crimping and sealing the upper opening to the inside. A thermistor chip is clamped between the positive plate and the cover plate and is electrically connected with the positive plate and the cover plate, two holes are formed in the cover plate, one air release hole is located in the center of the cover plate, an elastic sealing block is covered on the hole, the sealing block is covered on the inner side of the cover cap, the other liquid adding hole is formed between the center and the periphery of the cover plate, and the hole is blocked by steel balls. The advantages are that it can effectively prevent short circuit, heating, burst and leakage of battery, convenient operation of filling electrolyte, good sealing performance of battery, low requirement for production environment condition and reliable performance of produced battery. However, the electrolyte of the battery is filled firstly and then sealed by the steel balls, and when the electrolyte is filled again after being sealed, the steel balls are not easy to detach and install, and the inside of the battery cannot keep a sealing state during refilling, so that the performance of the battery is weakened.

Chinese patent document CN104241558A discloses a cap for cylindrical battery, which comprises an upper cap, a lower cap, and an explosion-proof ball, wherein the upper cap and the lower cap are tightly combined together, the side of the upper cap is provided with at least one exhaust hole, the center of the lower cap is provided with an explosion-proof hole, a containing space is formed between the upper cap and the lower cap, the explosion-proof ball is arranged in the containing space, the side of the lower cap is provided with at least one liquid injection hole, and the liquid injection hole is tightly matched and sealed by a liquid injection valve. The invention also includes a cylindrical battery using the cap. According to the cap, the liquid injection hole is formed in the lower cover of the cap, electrolyte can be added according to conditions, the liquid injection reject ratio of the battery is reduced, scrappage is reduced, and after the battery is used for a period of time, the electrolyte can be supplemented by opening the liquid injection valve on the liquid injection hole, so that the internal voltage of the battery is reduced, and the service life of the battery is prolonged. The battery has small volume of the liquid injection valve, so that special tools are needed during disassembly and assembly, and the inside of the battery can not keep a sealed state during refilling, thereby weakening the performance of the battery.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the above-mentioned prior art, the utility model discloses a battery and be used for block of battery has solved the problem that the electrolyte secondary filling process can't seal and the filling accuracy is poor among the prior art in the battery.

The utility model discloses a specific technical scheme as follows: the utility model provides a block of battery, includes upper cover and lower cover, and the marginal part welding of upper cover and lower cover is in the same place, and the middle part position of upper cover is equipped with protruding structure, the edge of protruding structure is provided with at least one exhaust hole, and the central point of lower cover puts and is equipped with an explosion-proof hole, forms a accommodation space between upper cover and the lower cover, be provided with the explosion-proof piece of resilience in the accommodation space, the explosion-proof piece of resilience highly is more than or equal to under the condition of not exerted pressure accommodation space's height, the edge of protruding structure is provided with at least one and annotates the liquid hole, just the centre of a circle in explosion-proof hole is located annotate on the center axis in liquid hole.

When the needle for filling pierces the rebound resilience explosion-proof block, the rebound resilience explosion-proof block tightly wraps the needle because of the rebound resilience explosion-proof block, and the outside air is prevented from entering the battery. And the height of the rebound resilience explosion-proof block under the condition of not applying pressure is greater than or equal to that of the accommodating space, and the rebound resilience explosion-proof block is fixed by extruding the rebound resilience explosion-proof block through the accommodating space, so that the sealing property of the battery is further enhanced. In addition, the convex structure of the upper cover is provided with a liquid injection hole, the central axis of the liquid injection hole penetrates through the circle center of the explosion-proof hole, and when the needle head extends into the explosion-proof hole through the liquid injection hole, the needle head must pierce through the rebound resilience explosion-proof block, so that the sealing effect in the filling process is ensured.

Set up the exhaust hole on the battery and be used for the gas outgoing who produces battery inside among the battery charging process, prevent that the inside pressure of battery is too big and take place the spalling, damage battery structure, but the battery is inside to be isolated with external environment simultaneously, consequently need set up a check valve structure, both keep inside exhaust unobstructed, prevent outside air admission simultaneously. The invention adopts a mode of combining the rebound resilience explosion-proof block and the explosion-proof hole to form a one-way exhaust valve structure: gather when the inside gas of battery, the inside pressure grow of battery, can produce the jacking force to the explosion-proof piece of resilience on the explosion-proof hole, when the jacking force is greater than the elasticity of the explosion-proof piece of resilience, the explosion-proof piece of resilience can be compressed, inside gas can be followed the gap discharge that produces between the explosion-proof piece of resilience after the compression and the lower cover, and in the final external environment that discharges of exhaust hole, thereby reach the purpose of release internal pressure, after gaseous release is accomplished, the inside pressure of battery reduces, when the jacking force that gaseous produced is less than the elasticity of explosion-proof piece of resilience, the explosion-proof piece of resilience is because the rebound effect volume resumes, block up the explosion-proof hole again, avoid outside air to flow into inside the battery.

Furthermore, a guide pipe extends from the circumferential edge of the liquid injection hole to the inside of the accommodating space.

Furthermore, the guide pipe and the liquid injection hole are coaxial.

The guide tube is used for guiding the needle filled with the electrolyte into the explosion-proof hole, the guide tube and the liquid injection hole are coaxially arranged for improving the accuracy of needle puncture, and the needle can accurately extend into the explosion-proof hole under the limiting effect of the guide tube.

Furthermore, the lower surface of the rebound resilience explosion-proof block is provided with a concave circular groove.

Further, the circular groove and the explosion-proof hole are coaxial.

Because the axis of the guide pipe and the axis of the explosion-proof hole form an included angle, when the included angle is too large, the needle head cannot completely extend into the explosion-proof hole, and therefore, in order to ensure that the filling process is smooth, the rebound resilience explosion-proof block is provided with a circular groove coaxial with the explosion-proof hole. When the contained angle is too big, stretch into the syringe needle along the stand pipe to puncture the explosion-proof piece of resilience, pierce the syringe needle in the circular recess and annotate the operation can, electrolyte can follow in the circular recess flows into explosion-proof downthehole, makes the filling operation more convenient, and the degree of accuracy of filling is higher.

Further, the explosion-proof piece of resilience adopts the TPE material, or the material that other resilience is high.

TPE is a short term for thermoplastic elastomer, also known as elastomer or synthetic rubber. Its product had both possessed traditional crosslinked vulcanized rubber's high elasticity, ageing-resistant, each item excellent performance of oil resistance, possessed the characteristics that ordinary plastics processing is convenient, the processing mode is wide simultaneously again the utility model discloses the TPE who adopts has the characteristics that the resilience is high.

Furthermore, the diameter range of the liquid injection hole is preferably 1.0-2.0mm, the diameter range of the explosion-proof hole is preferably 2.5-3.5mm, and the diameter of the needle head is preferably 0.6-1.0 mm.

Furthermore, the rebound resilience explosion-proof block is cylindrical or spherical, and the diameter of the rebound resilience explosion-proof block is larger than that of the explosion-proof hole.

Furthermore, the resilience explosion-proof block is a rectangle, the diagonal center of the resilience explosion-proof block is positioned on the axis of the explosion-proof hole, and the area of the lower surface of the resilience explosion-proof block is larger than that of the explosion-proof hole.

The structure of the rebound resilience explosion-proof block ensures that the rebound resilience explosion-proof block can completely block the explosion-proof hole all the time, thereby avoiding the leakage of the explosion-proof hole, causing the oxidation of the internal medium and the electrolyte of the battery and reducing the performance of the battery.

The utility model also discloses a battery, electrolyte can be added to this battery, and its biggest characteristics are similar with current battery structure for having adopted foretell block, other structures: the electrode rod is placed in the shell, the electrode rod is wrapped by the membrane electrode in a winding mode, the electrolyte is injected into the shell, and finally the cap is sealed, wherein the electrode rod is connected with the cap through a connecting piece.

Compared with the prior art, the utility model, have following advantage:

1) the utility model discloses the inside resilience explosion-proof piece that adopts of well block, with explosion-proof hole shutoff, isolated external environment and battery inner space contact, the upper cover is provided with annotates the liquid hole simultaneously, when filling electrolyte, can adopt the cylinder of taking the syringe needle to pierce the explosion-proof piece of resilience, to the downthehole electrolyte that adds of explosion-proof, make filling electrolyte in-process battery inside with external isolated, and after the filling is accomplished, the back resilience explosion-proof piece can be backfilled at once after the syringe needle is dialled out, the breach is impaled to the shutoff, make the battery keep the leakproofness.

2) The utility model discloses being equipped with the stand pipe on annotating the liquid mouth, when can avoiding annotating electrolyte, needing to impale the explosion-proof piece of resilience many times in order to look for the explosion-proof hole, can't the accuracy pierce the explosion-proof downthehole with the syringe needle, extravagant filling time reduces filling efficiency.

3) The utility model discloses in pierce the blast hole owing to the needle head when the filling, need to have higher operating accuracy, consequently be equipped with the circular recess of indent at the lower surface of the explosion-proof piece of resilience, need not to pierce completely when making filling electrolyte and pierce the blast hole in, can pierce the circular recess with the coaxial setting in blast hole, inject electrolyte into circular recess in, indirectly pour into the blast hole in, reduce operating personnel filling degree of accuracy requirement, reduce the operation degree of difficulty, also further promoted filling efficiency.

Drawings

Fig. 1 is a perspective view of a cap in an embodiment of the present invention;

fig. 2 is a side sectional view of a cap in embodiment 1 of the present invention;

fig. 3 is a side sectional view of a cap in embodiment 2 of the present invention;

fig. 4 is a side sectional view of a cap in embodiment 3 of the present invention;

fig. 5 is a sectional view of the internal structure of a battery according to embodiment 4 of the present invention;

the specific meanings of the reference numbers in the drawings:

1-liquid injection hole, 0111-guide tube, 2-explosion-proof hole, 3-upper cover, 4-exhaust hole, 5-rebound elasticity explosion-proof block, 0511-round groove, 6-lower cover, 7-membrane electrode, 8-shell, 9-electrode bar, 10-connecting piece and 11-needle head.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that the embodiments described herein are merely illustrative and explanatory of the present invention, and are not restrictive of the invention.

Example 1:

referring to fig. 1-2, in this embodiment 1, a cap for a battery is disclosed, which comprises an upper cover 3 and a lower cover 6, wherein the edge portions of the upper cover 3 and the lower cover 6 are welded together, a circular protrusion structure is provided at the middle position of the upper cover 3, three exhaust holes 4 are uniformly arranged on the edge of the convex structure, an explosion-proof hole 2 is arranged at the center of the lower cover 6, an accommodating space is formed between the upper cover 3 and the lower cover 6, a rebound resilience explosion-proof block 5 is arranged in the accommodating space, the height of the rebound resilience explosion-proof block 5 under the condition of no pressure is greater than that of the accommodating space, the rebound resilience explosion-proof block 5 keeps fixed through the extrusion action of an upper cover and a lower cover in the accommodating space, the edge of the protruding structure is provided with a liquid injection hole 1, and the circle center of the explosion-proof hole 2 is located on the central axis of the liquid injection hole 1.

The rebound resilience explosion-proof block 5 is preferably cylindrical, and the diameter of the rebound resilience explosion-proof block 5 is larger than that of the explosion-proof hole 2.

Example 2:

referring to fig. 3, the present embodiment 2 discloses a cap of a battery, which has the same basic structure as that of embodiment 1, except that: annotate the circumferential edge reason of liquid hole 1 to inside the extending of accommodation space has the stand pipe 0111, just the stand pipe 0111 with annotate liquid hole 1 coaxial line.

Example 3:

referring to fig. 4, a cap of a battery in this embodiment 3 has the same basic structure as that of embodiment 2, except that: the lower surface of the rebound resilience explosion-proof block 5 is provided with an inwards concave circular groove 0511, and the circular groove 0511 and the explosion-proof hole 02 are coaxial.

Example 4:

referring to fig. 5, the battery disclosed in this embodiment 4 can be supplemented with an electrolyte, and includes a case 8, an electrolyte, an electrode bar 9, a membrane electrode 7, and the like, where the electrode bar 9 is placed in the case 8, and the electrode bar 9 is wrapped by the membrane electrode 7 in multiple layers, and then the electrolyte is injected into the case 8, and finally the cap is sealed, where the electrode bar 9 is connected to the cap through a connecting piece 10. In the present embodiment 4, the cap structure disclosed in embodiment 3 is adopted as the cap, wherein the diameter of the liquid injection hole 1 is preferably 1.5mm, and the diameter of the explosion-proof hole 2 is preferably 3.0 mm.

In this embodiment 4, a syringe with a needle having a diameter of 0.8mm is used for injecting the electrolyte, and the complete injection process is as follows: the battery is vertically placed on a plane, a cover cap of the battery faces upwards, a proper amount of electrolyte is extracted by a needle cylinder, a needle head 11 extends into a liquid injection hole 1 and extends into the cover cap along the axis direction of a guide pipe 0111 to penetrate into a rebound resilience explosion-proof block 5, the needle head 11 penetrates into a circular groove when the needle head 11 has no resistance or the needle cylinder can inject the electrolyte only by using small injection pressure, the electrolyte in the needle cylinder is slowly pushed to be injected into the battery, the needle head 11 is pulled backwards along the penetrating direction after the injection is completed, the rebound resilience explosion-proof block 5 immediately backfills and seals the needle hole, and the injection process is finished.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.

Claims

1. The utility model provides a block of battery, includes upper cover, lower cover and the explosion-proof piece of resilience, the marginal portion welding of upper cover and lower cover is in the same place, and the middle part position of upper cover is equipped with protruding structure, the edge of protruding structure is provided with at least one exhaust hole, and the central point of lower cover puts and is equipped with an explosion-proof hole, forms an accommodation space, characterized in that between upper cover and the lower cover: the anti-explosion device is characterized in that the accommodating space is internally provided with a rebound resilience anti-explosion block, the height of the rebound resilience anti-explosion block under the condition that pressure is not applied is greater than or equal to the height of the accommodating space, the edge of the protruding structure is provided with at least one liquid injection hole, and the circle center of the anti-explosion hole is located on the central axis.

2. The cap of claim 1, wherein: and a guide pipe extends from the circumferential edge of the liquid injection hole to the inside of the accommodating space.

3. The cap of claim 2, wherein: the guide pipe is coaxial with the liquid injection hole.

4. A cap according to claim 3, wherein: the lower surface of the rebound resilience explosion-proof block is provided with a concave circular groove.

5. The cap of claim 4, wherein: the circular groove and the explosion-proof hole are coaxial.

6. The cap of claim 5, wherein: and the rebound resilience explosion-proof block is made of TPE material.

7. The cap of claim 6, wherein: the diameter of the liquid injection hole is 1.0-2.0mm, and the diameter of the explosion-proof hole is 2.5-3.5 mm.

8. The cap of claim 7, wherein: the rebound resilience explosion-proof block is cylindrical or spherical, and the diameter of the rebound resilience explosion-proof block is larger than that of the explosion-proof hole.

9. The cap of claim 7, wherein: the anti-explosion resilient block is rectangular, the diagonal center of the anti-explosion resilient block is positioned on the axis of the anti-explosion hole, and the area of the lower surface of the anti-explosion resilient block is larger than that of the anti-explosion hole.

10. A battery, characterized by: the battery employs the cap of any one of claims 1-9.