阅读说明：本技术 一种储液装置和包括该储液装置的锂电池及其制造方法 (Liquid storage device, lithium battery comprising liquid storage device and manufacturing method of lithium battery ) 是由 雷付权 王继涛 孙浩 张勇 陈启多 程君 于 2021-09-06 设计创作，主要内容包括：本发明公开了一种储液装置和包括该储液装置的锂电池及其制造方法,所述一种储液装置包括至少第一储液件和第二储液件,所述第一储液件和第二储液件的结构完全相同,并且所述第一储液件装设在第二储液件上方；所述第一储液件和第二储液件内部都存储有电解液；所述第一储液件包括第一储液件主体、用于电解液流通或者存储的第一储液孔和用于容纳第一卷针的第一卷针孔；所述第一卷针用于带动第一储液件做旋转运动；所述第二储液件包括第二储液件主体、用于电解液流通或者存储的第二储液孔和用于容纳第二卷针的第二卷针孔；所述第二卷针用于带动第二储液件做旋转运动；本发明可以持续补充电池循环过程中消耗的电解液,从而提高电池循环寿命。(The invention discloses a liquid storage device, a lithium battery comprising the liquid storage device and a manufacturing method of the lithium battery, wherein the liquid storage device comprises at least a first liquid storage part and a second liquid storage part, the structures of the first liquid storage part and the second liquid storage part are completely the same, and the first liquid storage part is arranged above the second liquid storage part; electrolyte is stored in the first liquid storage part and the second liquid storage part; the first liquid storage part comprises a first liquid storage part main body, a first liquid storage hole for circulating or storing electrolyte and a first winding needle hole for accommodating a first winding needle; the first winding needle is used for driving the first liquid storage part to rotate; the second liquid storage part comprises a second liquid storage part main body, a second liquid storage hole used for circulating or storing electrolyte and a second winding needle hole used for accommodating a second winding needle; the second winding needle is used for driving the second liquid storage part to rotate; the invention can continuously replenish the electrolyte consumed in the battery cycle process, thereby prolonging the battery cycle life.)

1. A liquid storage device is characterized by comprising at least a first liquid storage part (1) and a second liquid storage part (2), wherein the structures of the first liquid storage part (1) and the second liquid storage part (2) are completely the same, and the first liquid storage part (1) is arranged above the second liquid storage part (2); electrolyte is stored in the first liquid storage part (1) and the second liquid storage part (2); the first liquid storage part (1) comprises a first liquid storage part main body (101), a first liquid storage hole (102) used for circulating or storing electrolyte and a first winding needle hole (103) used for accommodating a first winding needle (3); the first winding needle (3) is used for driving the first liquid storage part (1) to rotate; the second liquid storage part (2) comprises a second liquid storage part main body (201), a second liquid storage hole (202) used for circulating or storing electrolyte and a second needle winding hole (203) used for accommodating a second needle winding (4); the second winding needle (4) is used for driving the second liquid storage part (2) to rotate.

2. A reservoir device according to claim 1, wherein the first reservoir hole (102) is a through hole for electrolyte circulation or a blind hole for electrolyte storage; the number of the first liquid storage holes (102) is at least one; the diameter of the first liquid storage hole (102) is 0.5-3 mm; the second liquid storage hole (202) is a through hole for electrolyte circulation or a blind hole for electrolyte storage; the number of the second liquid storage holes (202) is at least one; the diameter of the second liquid storage hole (202) is 0.5-3 mm.

3. A liquid storage device according to claim 1 or 2, wherein the number of the first roll needle holes (103) and the second roll needle holes (203) is at least one; the diameters of the first winding needle hole (103) and the second winding needle hole (203) are between 1mm and 5 mm.

4. A reservoir device according to claim 1, wherein the first reservoir (1) and the second reservoir (2) are electrolyte corrosion resistant polyethylene, polypropylene, polyethylene terephthalate or polycarbonate polymer members.

5. A reservoir according to claim 1, characterized in that the first reservoir (1) and the second reservoir (2) are semi-cylindrical or semi-elliptic cylindrical in shape.

6. A liquid storage device as claimed in claim 1, wherein the first winding needle (3) comprises a first winding needle body (303) and a first winding needle insertion portion (301) provided at one end of the first winding needle body (303), the first winding needle insertion portion (301) further being provided with a first winding needle piston portion (302); the first reel needle inserting part (301) is inserted into the first reel needle hole (103); the first winding needle piston part (302) is tightly contacted with the first winding needle hole (103), so that the first liquid storage part (1) is driven to rotate;

the second winding needle (4) comprises a second winding needle main body (403) and a second winding needle inserting part (401) arranged at one end of the second winding needle main body (403), and a second winding needle piston part (402) is arranged on the second winding needle inserting part (401); the second winding needle inserting part (401) is inserted into the second winding needle hole (203); the second needle winding piston part (402) is in close contact with the second needle winding hole (203), so that the second liquid storage part (2) is driven to rotate.

7. A lithium battery comprising the liquid storage device according to any one of claims 1 to 6, wherein the lithium battery comprises a winding core, the winding core comprises a positive pole piece, a negative pole piece and a diaphragm, and the positive pole piece, the negative pole piece and the diaphragm are wound to form the lithium battery, one end of the positive pole piece, one end of the negative pole piece and one end of the diaphragm are clamped in the middle by the first liquid storage part (1) and the second liquid storage part (2), and the liquid storage device is arranged inside the winding core.

8. The lithium battery comprising the liquid storage device is characterized in that the winding core is packaged by a steel shell, an aluminum shell or an aluminum-plastic film to manufacture a steel shell, an aluminum shell or an aluminum-plastic film lithium battery.

9. A method of manufacturing a lithium battery comprising the reservoir device of claim 7, comprising the steps of:

step S1: preparing a positive pole piece, a negative pole piece and a diaphragm;

step S2: inserting a first winding needle (3) into a first winding needle hole (103) in a first liquid storage part (1); the first liquid storage part (1) is fixed through a first needle winding piston part (302); inserting a second winding needle (4) into a second winding needle hole (203) in a second liquid storage part (2); the second liquid storage part (2) is fixed through a second needle winding piston part (402);

step S3: clamping one ends of a positive pole piece, a negative pole piece and a diaphragm between a first liquid storage part (1) and a second liquid storage part (2);

step S4: driving a first winding needle (3) and a second winding needle (4) to rotate, so that the positive pole piece, the negative pole piece and the diaphragm are wound to form a winding core;

step S5: the first winding needle (3) and the second winding needle (4) are respectively pulled out of the first liquid storage part (1) and the second liquid storage part (2), and the first liquid storage part (1) and the second liquid storage part (2) are reserved inside the winding core;

step S6: and packaging the winding core by using a steel shell, an aluminum shell or an aluminum-plastic film to manufacture the steel shell, the aluminum shell or the aluminum-plastic film lithium battery.

Technical Field

The invention relates to the technical field of lithium batteries, in particular to a liquid storage device, a lithium battery comprising the liquid storage device and a manufacturing method of the lithium battery.

Background

The winding type lithium battery is formed by winding the positive pole piece, the negative pole piece and the isolating film through the winding needle, after winding is completed, the winding needle is pulled out from the inside of the winding core, and then hot pressing or cold pressing shaping is carried out on the winding core. However, in the process of pulling the winding needle out of the winding core, the isolating film is easily taken out of the electric core main body along with the winding needle, so that the risks of membrane wrinkling, pole piece dislocation and even direct contact short circuit of the positive electrode and the negative electrode exist. In addition, the inner ring pole piece has almost no transition arc area at the corner after hot pressing or cold pressing, which is equivalent to directly folding the pole piece, so that the problems of pole piece powder falling, fragment and the like are easily caused, and potential safety hazards exist. To solve the problem, the powder falling phenomenon is mainly improved to a certain extent by improving the flexibility of the pole piece at present, but the effect is very limited.

The lithium battery comprises a positive pole piece, a negative pole piece, a diaphragm and electrolyte. The electrolyte is used as a carrier for the lithium ions to be repeatedly de-intercalated between the anode and the cathode, and can be continuously consumed in the battery circulation process, and the retention amount of the electrolyte plays a key role in the performance of the battery.

For example, chinese patent CN107579174A discloses a soft-package polymer power battery with ultra-long cycle life and high energy density, and the specific implementation method is as follows: through the utmost point ear protection spacer that has the stock solution function of increasing in battery inside, improve the volume of keeping of the inside electrolyte of battery, can continuously supply the electrolyte that consumes at the circulation in-process, guarantee the overlength cycle life of battery. Although the method can improve the electrolyte retaining amount so as to improve the cycle performance of the battery, the operation of installing the lug protection spacer sleeve between two lugs is inconvenient, the application scenes are few, and the method is only suitable for the condition that the top packaging area of the soft package battery is wider.

In view of the above, it is necessary to provide a technical solution to the above problems.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a liquid storage device, a lithium battery comprising the liquid storage device and a manufacturing method of the lithium battery; the curvature of the corner of the pole piece at the inner ring can be reduced, and the powder falling and the fragment of the pole piece are improved; the risks of membrane wrinkling, pole piece dislocation and short circuit can be avoided; can continuously replenish the electrolyte consumed in the battery cycle process, thereby prolonging the battery cycle life.

In order to achieve the above object, the present invention provides a liquid storage device, which includes at least a first liquid storage component and a second liquid storage component, wherein the first liquid storage component and the second liquid storage component have the same structure, and the first liquid storage component is mounted above the second liquid storage component; electrolyte is stored in the first liquid storage part and the second liquid storage part; the first liquid storage part comprises a first liquid storage part main body, a first liquid storage hole for circulating or storing electrolyte and a first winding needle hole for accommodating a first winding needle; the first winding needle is used for driving the first liquid storage part to rotate; the second liquid storage part comprises a second liquid storage part main body, a second liquid storage hole used for circulating or storing electrolyte and a second winding needle hole used for accommodating a second winding needle; the second winding needle is used for driving the second liquid storage part to rotate.

Preferably, the first liquid storage hole is a through hole for electrolyte circulation or a blind hole for electrolyte storage; the number of the first liquid storage holes is at least one; the diameter of the first liquid storage hole is 0.5-3 mm; the second liquid storage hole is a through hole for electrolyte circulation or a blind hole for electrolyte storage; the number of the second liquid storage holes is at least one; the diameter of the second liquid storage hole is 0.5-3 mm.

Preferably, the number of the first roll needle holes and the second roll needle holes is at least one; the diameters of the first winding needle hole and the second winding needle hole are between 1mm and 5 mm.

Preferably, the first liquid storage part and the second liquid storage part are made of polyethylene, polypropylene, polyethylene glycol terephthalate or polycarbonate polymer high molecular material members resistant to electrolyte corrosion.

Preferably, the first and second reservoirs are semi-cylindrical or semi-elliptical.

Preferably, the first bobbin needle comprises a first bobbin needle main body and a first bobbin needle insertion part arranged at one end of the first bobbin needle main body, and a first bobbin needle piston part is further arranged on the first bobbin needle insertion part; the first reel needle inserting part is inserted into the first reel needle hole; the first winding needle piston part is tightly contacted with the first winding needle hole, so that the first liquid storage part is driven to rotate;

the second winding needle comprises a second winding needle main body and a second winding needle inserting part arranged at one end of the second winding needle main body, and a second winding needle piston part is also arranged on the second winding needle inserting part; the second winding needle inserting part is inserted into the second winding needle hole; and the second needle winding piston part is in close contact with the second needle winding hole so as to drive the second liquid storage part to rotate.

The invention also provides a lithium battery comprising the liquid storage device, which is characterized by comprising a roll core, wherein the roll core comprises a positive pole piece, a negative pole piece and a diaphragm, and is formed by winding the positive pole piece, the negative pole piece and the diaphragm, one ends of the positive pole piece, the negative pole piece and the diaphragm are clamped in the middle by the first liquid storage part and the second liquid storage part, and the liquid storage device is arranged in the roll core.

Preferably, the winding core is packaged by a steel shell, an aluminum shell or an aluminum-plastic film to manufacture a steel shell, an aluminum shell or an aluminum-plastic film lithium battery.

The invention also provides a manufacturing method for manufacturing the lithium battery comprising the liquid storage device, which comprises the following steps:

step S1: preparing a positive pole piece, a negative pole piece and a diaphragm;

step S2: inserting a first spool needle into a first spool needle hole in a first reservoir; the first liquid storage part is fixed through the first winding needle piston part; inserting a second winding needle into a second winding needle hole in a second liquid storage part; the second liquid storage part is fixed through the second needle winding piston part;

step S3: clamping one ends of the positive pole piece, the negative pole piece and the diaphragm between the first liquid storage part and the second liquid storage part;

step S4: driving the first winding needle and the second winding needle to rotate, so that the positive pole piece, the negative pole piece and the diaphragm are wound to form a winding core;

step S5: respectively pulling out the first winding needle and the second winding needle from the first liquid storage part and the second liquid storage part, and keeping the first liquid storage part and the second liquid storage part inside the winding core;

step S6: and packaging the winding core by using a steel shell, an aluminum shell or an aluminum-plastic film to manufacture the steel shell, the aluminum shell or the aluminum-plastic film lithium battery.

Compared with the prior art, the invention has the beneficial effects that:

1. the liquid storage device has the function of storing electrolyte, and specifically, the electrolyte is stored in the first liquid storage part and the second liquid storage part; the first liquid storage part comprises a first liquid storage hole for circulating or storing electrolyte; the second liquid storage part comprises a second liquid storage hole for circulation or storage of electrolyte, the electrolyte is mainly consumed in the damage and reforming processes of an SEI (solid electrolyte interface) film of a negative electrode interface in the battery circulation process, and when the electrolyte is consumed to enable the battery to be in a barren solution state, the circulation life can be rapidly reduced; and the liquid storage device can provide extra electrolyte, so that the time for the battery system to enter a barren solution state is delayed, and the cycle life of the battery is prolonged.

2. The first liquid storage part and the second liquid storage part can be respectively fixed on the first winding needle and the second winding needle, and the first liquid storage part and the second liquid storage part have certain radians on the surfaces, so that the problems of powder falling and fragment breakage can be avoided in the winding process; and after the winding of the winding core is completed, the liquid storage device is retained inside the winding core, and when the winding core is subjected to hot pressing or cold pressing, the curvature of the corners of the pole piece in the inner ring of the winding core can be reduced, so that the problems of powder falling and fragment of the pole piece are solved.

3. According to the invention, the first liquid storage part and the second liquid storage part are wound with the first winding needle and the second winding needle synchronously, and after the winding core is wound, the winding needle is only required to be pulled out of the winding needle hole of the liquid storage device, so that the risks of diaphragm wrinkling, pole piece dislocation and even direct contact short circuit of the positive electrode and the negative electrode caused by poor needle pulling of the winding core can be fundamentally avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a reservoir provided by the present invention;

fig. 2 is a graph comparing the cycle curves of a lithium battery according to an example of the present invention and a lithium battery according to a comparative example.

The figure includes:

1-a first liquid storage part, 2-a second liquid storage part, 101-a first liquid storage part main body, 102-a first liquid storage hole, 103-a first winding needle hole, 3-a first winding needle, 201-a second liquid storage part main body, 202-a second liquid storage hole, 203-a second winding needle hole, 4-a second winding needle, 303-a first winding needle main body, 301-a first winding needle inserting part, 302-a first winding needle piston part, 403-a second winding needle main body, 401-a second winding needle inserting part and 402-a second winding needle piston part.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are one embodiment of the present invention, and not all embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.

Example one

Referring to fig. 1, a liquid storage device is provided according to a first embodiment of the present invention.

As shown in fig. 1, the liquid storage device at least comprises a first liquid storage part 1 and a second liquid storage part 2, wherein the first liquid storage part 1 and the second liquid storage part 2 are paired and matched for use, and two, four and the like are available; in the first embodiment, the liquid storage device includes a first liquid storage component 1 and a second liquid storage component 2, the first liquid storage component 1 and the second liquid storage component 2 have the same structure, and the first liquid storage component 1 is mounted above the second liquid storage component 2; the first liquid storage part 1 and the second liquid storage part 2 are hollow structures, have certain storage space, and store electrolyte.

As mentioned above, the liquid storage device has a function of storing electrolyte, and specifically, the first liquid storage part 1 and the second liquid storage part 2 both store electrolyte therein; further, the first reservoir 1 includes a first reservoir hole 102 for circulating or storing the electrolyte; the second liquid storage part 2 comprises a second liquid storage hole 202 for circulating or storing the electrolyte, the electrolyte is mainly consumed in the process of breaking and reforming an SEI (solid electrolyte interface) film of a negative electrode interface in the battery circulation process, and when the electrolyte is consumed to enable the battery to be in a barren solution state, the circulation life can be rapidly reduced; and the liquid storage device can provide extra electrolyte, so that the time for the battery system to enter a barren solution state is delayed, and the cycle life of the battery is prolonged.

As shown in fig. 1, the first reservoir 1 includes a first reservoir body 101; a plurality of first liquid storage holes 102 are formed in the first liquid storage part main body 101; the first reservoir hole 102 is used for circulating or storing electrolyte; specifically, the first reservoir hole 102 may be a through hole for electrolyte to flow through, or a blind hole for electrolyte to be stored; the method can also be a mixture of through holes and blind holes, namely, the through holes and the blind holes are provided; and the number of the first liquid storage holes 102 is at least one; the diameter of the first liquid storage hole 102 is 0.5-3 mm; the side surface of the first liquid storage part main body 101 is also provided with at least one first winding needle hole 103; the first winding needle hole 103 is used for accommodating a first winding needle 3; the diameter of the first winding needle hole 103 is 1-5 mm; the first winding needle 3 is inserted into the first winding needle hole 103 and is used for driving the first liquid storage part 1 to rotate; thereby performing the winding work of the winding core.

As shown in fig. 1, the second reservoir 2 is located below the first reservoir 1, and the second reservoir 2 includes a second reservoir body 201; a plurality of second liquid storage holes 202 are formed in the second liquid storage part main body 201; the second reservoir hole 202 is also used for circulating or storing electrolyte; specifically, the second reservoir hole 202 may be a through hole for electrolyte to flow through, or a blind hole for electrolyte to be stored; the method can also be a mixture of through holes and blind holes, namely, the through holes and the blind holes are provided; and the number of the second liquid storage holes 202 is at least one; the diameter of the second liquid storage hole 202 is 0.5-3 mm; the side surface of the second liquid storage part main body 201 is also provided with at least one second winding pin hole 203; the second needle rolling hole 203 is used for accommodating a second needle rolling 4; the diameter of the second needle winding hole 203 is 1-5 mm; the second winding needle 4 is inserted into the second winding needle hole 203 and is used for driving the second liquid storage part 2 to rotate; thereby performing the winding work of the winding core.

The first liquid storage part 1 and the second liquid storage part 2 are polymer high-molecular material members of polyethylene PE, polypropylene PP, polyethylene terephthalate PET or polycarbonate PC which are resistant to electrolyte corrosion, have certain strength, and can prevent electrolyte corrosion.

As shown in fig. 1, in this embodiment, the first liquid storage component 1 and the second liquid storage component 2 are both semi-cylindrical, and the first liquid storage component 1 and the second liquid storage component 2 are combined together to form a complete cylinder; the positive pole piece, the negative pole piece and the diaphragm are clamped between the first liquid storage part 1 and the second liquid storage part 2; furthermore, the surfaces of the first liquid storage part 1 and the second liquid storage part 2 are provided with arc structures, so that the curvature of corners can be reduced; furthermore, the first reservoir 1 and the second reservoir 2 may also be in the shape of a semi-elliptic cylinder or a semi-U-shaped cylinder.

First stock solution spare 1 and second stock solution spare 2 are installed respectively on needle 4 is rolled up to first book needle 3 and second, because first stock solution spare and second stock solution spare surface have certain radian to after the completion is rolled up to roll up the core, first stock solution spare 1 and second stock solution spare 2 reserve inside rolling up the core, when perhaps colding pressing to rolling up the core, can reduce the camber of rolling up core inner circle pole piece corner to improve the problem of falling pole piece powder and rupture.

As shown in fig. 1, the first lancet 3 includes a first lancet body 303 and a first lancet inserting portion 301 disposed at one end of the first lancet body 303, and a first lancet piston portion 302 is further disposed on the first lancet inserting portion 301.

The working mode of the first winding needle 3 is as follows: firstly, since the diameter of the first winding needle inserting part 301 is smaller than that of the first winding needle hole 103, the first winding needle inserting part 301 can be inserted into the first winding needle hole 103; secondly, the first syringe piston portion 302 protrudes outward due to internal pressurization and is in close contact with the first syringe hole 103; finally, the first winding needle 3 is driven to rotate, so that the first liquid storage part 1 is driven to rotate.

Further, the interior of the first syringe 3 may be a hollow structure, and when the first syringe piston portion 302 is subjected to internal pressure, the piston extends outwards, so that the diameter of the first syringe piston portion 302 is increased, and the first syringe piston portion can be well in close contact with the first syringe hole 103; fixing the first liquid storage component 1 on the first winding needle 3; thereby driving the first liquid storage part 1 to rotate; when the first winding needle piston part 302 is decompressed, the piston retracts inwards, so that the diameter of the first winding needle piston part 302 is reduced, and the first winding needle piston part can be well separated from the first winding needle hole 103; so that the first winding needle 3 can be easily removed from the first reservoir 1.

Similarly, the second winding needle 4 has the same function and structure as the first winding needle 3; specifically, as shown in fig. 1, the second needle 4 includes a second needle winding body 403 at the end; one end of the second needle winding main body 403 is provided with a second needle winding inserting portion 401, and the second needle winding inserting portion 401 is further provided with a second needle winding piston portion 402.

The working mode of the second winding needle 4 is as follows: first, since the diameter of the second winding needle inserting portion 401 is smaller than that of the second winding needle hole 203, the second winding needle inserting portion 401 can be inserted into the second winding needle hole 203; secondly, the second needle winding piston part 402 extends outwards due to internal pressurization and is in close contact with the second needle winding hole 203; and finally, driving the second winding needle 4 to rotate so as to drive the second liquid storage part 2 to rotate.

Further, the inside of the second winding needle 4 may be a hollow structure, and when the second winding needle piston portion 402 is subjected to internal pressure, the piston extends outwards, so that the diameter of the second winding needle piston portion 402 is increased, and the second winding needle piston portion can be well in close contact with the second winding needle hole 203; fixing the second liquid storage part 2 on the second winding needle 4; thereby driving the second liquid storage part 2 to rotate; when the second needle winding piston part 402 is decompressed, the piston retracts inwards, so that the diameter of the second needle winding piston part 402 is reduced, and the second needle winding piston part can be well separated from the second needle winding hole 203; so that the second needle 4 can be easily removed from the second reservoir 2.

As shown in fig. 1, the first winding needle 3 drives the first liquid storage component 1 to rotate; the second winding needle 4 drives the second liquid storage part 2 to rotate; the first winding needle 3 and the second winding needle 4 are wound synchronously, so that the first liquid storage part 1 and the second liquid storage part 2 are wound synchronously, and after the winding core is wound and formed, the first winding needle 3 and the second winding needle 4 are pulled out of the first winding needle hole 103 and the second winding needle hole 203 respectively; the risks of diaphragm wrinkling, pole piece dislocation and even direct existence of the positive pole and the negative pole caused by poor needle pulling of the winding core can be fundamentally avoided.

Example two

Referring to fig. 1, a lithium battery including the liquid storage device according to the first embodiment is provided in the second embodiment of the present invention.

The lithium battery comprises a winding core and a liquid storage device arranged inside the winding core; specifically, roll up the core and include positive pole piece, negative pole piece and diaphragm, and by positive pole piece, negative pole piece and diaphragm are convoluteed and are formed, and is further, first stock solution spare 1 and second stock solution spare 2 are in the centre of the one end centre gripping of positive pole piece, negative pole piece and diaphragm, then roll up the book system and form.

Further, the winding core can be packaged by a steel shell, an aluminum shell or an aluminum-plastic film, and then the steel shell, the aluminum shell or the aluminum-plastic film lithium battery is finally manufactured.

Further, as can be seen from the above discussion: the liquid storage device is arranged in the winding core and can be used universally on a winding type battery, the liquid storage device can also be uniformly arranged in the middle of a laminated type battery in the laminated type battery, and meanwhile, the shape of the liquid storage device needs to be made into a cuboid or a cube; this allows for better lamination to accommodate the laminated battery.

EXAMPLE III

Referring to fig. 1, a third embodiment of the present invention provides a method for manufacturing a lithium battery including the liquid storage device according to the second embodiment, including the following steps:

step S1: according to a manufacturing method of a common winding type lithium battery, a positive pole piece, a negative pole piece and a diaphragm are prepared for standby.

Step S2: fixing a first liquid storage part 1 and a second liquid storage part 2 on a first winding needle 3 and a second winding needle 4 respectively; inserting a first winding needle 3 into a first winding needle hole 103 in the first liquid storage part 1; the first liquid storage component 1 is fixed through the first needle winding piston part 302; inserting a second winding needle 4 into a second winding needle hole 203 in the second liquid storage part 2; and the second reservoir 2 is secured by the second needle-winding piston portion 402.

Step S3: clamping one ends of a positive pole piece, a negative pole piece and a diaphragm between a first liquid storage part 1 and a second liquid storage part 2; preparation before winding is performed.

Step S4: and driving the first winding needle 3 and the second winding needle 4 to rotate, so that the positive pole piece, the negative pole piece and the diaphragm are wound to form a winding core.

Step S5: the first winding needle 3 and the second winding needle 4 are respectively pulled out of the first liquid storage part 1 and the second liquid storage part 2, and the first liquid storage part 1 and the second liquid storage part 2 are kept in the winding core; roll up a core and roll up and keep first stock solution spare 1 and second stock solution spare 2 inside rolling up the core after accomplishing to improve electrolyte reserve volume, and then improve the cycle life of lithium cell.

Step S6: and packaging the winding core by using a steel shell, an aluminum shell or an aluminum-plastic film to manufacture the steel shell, the aluminum shell or the aluminum-plastic film lithium battery.

Examples

The following are specific examples in practical operation and are compared with comparative examples; the following describes specific embodiments thereof in detail.

Firstly, preparing a positive pole piece, a negative pole piece and a diaphragm for winding.

The first liquid storage member 1 is fixedly mounted on the first winding needle 3, and the first liquid storage member 1 is fixed by the first winding needle piston portion 302.

The second liquid storage member 2 is fixedly mounted on the second winding needle 4, and the second liquid storage member 2 is fixed by the second winding needle piston portion 402.

The surfaces of the first liquid storage part 1 and the second liquid storage part 2 are respectively provided with a plurality of first liquid storage holes 102 and second liquid storage holes 202 which are through holes with the diameter of 1 mm.

One side of the first liquid storage part 1 and one side of the second liquid storage part 2 are respectively provided with a first needle winding hole 103 and a second needle winding hole 203; the diameter of the first winding needle hole 103 and the second winding needle hole 203 is 2 mm.

The first liquid storage part 1 and the second liquid storage part 2 are identical.

The first liquid storage part 1 and the second liquid storage part 2 clamp one ends of a positive pole piece, a negative pole piece and a diaphragm; and driving the first winding needle 3 and the second winding needle 4 to rotate, so that the positive pole piece, the negative pole piece and the diaphragm are wound to form a winding core.

After the winding of the winding core is finished, releasing air pressure inside the first winding needle 3 and the second winding needle 4, contracting the pistons on the first winding needle piston part 302 and the second winding needle piston part 402, pulling the first winding needle 3 and the second winding needle 4 out of the first liquid storage part 1 and the second liquid storage part 2 respectively, and keeping the first liquid storage part 1 and the second liquid storage part 2 inside the winding core; roll up a core and roll up and keep first stock solution spare 1 and second stock solution spare 2 inside rolling up the core after accomplishing to improve electrolyte reserve volume, and then improve the cycle life of lithium cell.

And then carrying out subsequent process flow according to the conventional lithium battery manufacturing process.

Packaging the winding core by using a steel shell, an aluminum shell or an aluminum-plastic film to finally manufacture the steel shell, the aluminum shell or the aluminum-plastic film lithium battery with the liquid storage device; example lithium batteries were obtained.

Comparative example

The comparative example lithium battery is a conventional lithium battery, a liquid storage component is not arranged in a winding core, and other design or manufacturing process flows are completely the same as those of the embodiment.

FIG. 2 is a graph comparing the cycle curves of a lithium battery according to an example of the present invention and a lithium battery according to a comparative example; according to fig. 2, when the cycle number is less than 800, the capacity retention rate of the lithium battery of the embodiment is better than that of the lithium battery of the comparative example, but the difference between the capacity retention rate and the capacity retention rate is not large, and the advantages of the lithium battery of the embodiment are not obvious; when the cycle number is more than 800, the capacity retention rate of the lithium battery of the embodiment is obviously superior to that of the lithium battery of the comparative example, specifically, the capacity retention rate of the lithium battery of the comparative example is obviously reduced in a cliff manner, while the capacity retention rate of the lithium battery of the embodiment keeps a stable reduction trend, and when the cycle number is more than 800, the lithium battery of the embodiment has obvious advantages.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.