Battery

Abstract

The utility model discloses a battery which comprises a shell and a battery cell structure arranged in the shell, a liquid injection hole is formed in the shell, and a liquid separation piece is arranged between the battery cell structure and the liquid injection hole. According to the battery disclosed by the utility model, when electrolyte is injected, the electrolyte is firstly contacted with the liquid separation piece, the liquid separation piece can relieve the injection pressure of the electrolyte and play a role in shunting, and the structure can eliminate the risk that the electrolyte rushes over the diaphragm, so that the risk of short circuit is eliminated, and the manufacturing process yield and the battery cell safety performance are improved; and meanwhile, the liquid separation part plays a role in flow division, and liquid separation part surface micropore treatment can be carried out on the liquid separation part, so that the flowing efficiency of the electrolyte can be improved, and the infiltration effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium ion battery, especially a battery. BACKGROUND

[0002] But in recent years lithium ion battery use scene is more and more extensive, and safety accidents occur frequently, threaten the personal safety, commercial promotion and social benefit, therefore, the safety research of lithium ion battery has become the research hotspot of battery field at present.

[0003] The safety of lithium ion battery depends on the thermal stability of battery material, and is closely related to the abuse conditions such as battery needle and extrusion, and the abuse of battery mainly causes the short circuit in the cell, and the short circuit area forms the local thermal area due to a large number of joule heat, and when the temperature of thermal area exceeds the critical point, heat runaway is triggered, and the danger such as smoke, fire and explosion occurs, therefore, in the manufacture of cell, it is essential to avoid the short circuit risk in the cell, the measure for preventing the short circuit of cell in the industry is to paste insulating glue at the junction of pole piece material area and empty foil area, and after pasting insulating glue, the internal short circuit caused by the burr of material area edge piercing diaphragm can be prevented, but in the steel shell cell, the liquid injection hole is located at the head of cell, and direct liquid injection exists the risk that diaphragm is overturned and thus positive and negative poles contact. SUMMARY

[0004] The utility model discloses a battery to solve the above technical problem.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a battery, including shell and the cell structure that is located in the shell, be equipped with the liquid injection hole on the shell, be equipped with the liquid separator between the cell structure and the liquid injection hole.

[0007] Further, the liquid separator is located directly below the liquid injection hole.

[0008] Further, the width of the liquid separator is greater than or equal to the diameter of the liquid injection hole.

[0009] Further, a plurality of micropores are provided on the liquid separator.

[0010] Further, the cell structure includes a first pole piece, a second pole piece, and a diaphragm disposed between the first pole piece and the second pole piece, the first pole piece is provided with a first tab, and the second pole piece is provided with a second tab.

[0011] Further, the liquid separator is disposed between the first tab and the second tab.

[0012] Further, one of the first and second pole pieces is of positive polarity, and the other of the first and second pole pieces is of negative polarity.

[0013] Further, the shell comprises a middle frame and first and second shells arranged on opposite sides of the middle frame, and the liquid injection hole is arranged on the middle frame.

[0014] Further, the middle frame is provided with first and second pole posts, one of the first and second pole posts is of positive polarity, and the other of the first and second pole posts is of negative polarity.

[0015] Further, the pole piece of positive polarity among the first and second pole pieces is connected with the pole post of positive polarity among the first and second pole posts, and the pole piece of negative polarity among the first and second pole pieces is connected with the pole post of negative polarity among the first and second pole posts.

[0016] In summary, the battery has the advantages that:

[0017] The battery has the advantages that: the liquid injection hole is arranged directly below the liquid separation piece, the liquid separation piece is contacted first when the electrolyte is injected, the liquid separation piece can slow down the electrolyte injection pressure and simultaneously play a shunt role, the structure can eliminate the risk of electrolyte overturning the separator, thereby eliminating the short circuit risk, improving the process yield rate and the safety performance of the battery cell, the liquid separation piece plays a shunt role, and the surface micropore treatment of the liquid separation piece can increase the flow efficiency of the electrolyte and improve the infiltration effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 FIG. 1 is a structural schematic diagram of a battery according to the present application;

[0019] Fig. 2 FIG. 2 is a structural schematic diagram of a battery cell structure according to an embodiment of the present application;

[0020] Fig. 3 FIG. 3 is a structural schematic diagram of a battery cell structure according to another embodiment of the present application.

[0021] DRAWINGS

[0022] The shell 1, the liquid injection hole 101, the battery cell structure 2, the separator 201, the first pole piece 202, the second pole piece 203, the first pole lug 204, the second pole lug 205, and the liquid separation piece 206. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below, obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0024] Please refer to Figs. 1-3 The utility model provides a kind of battery, including shell 1 and the electric core structure 2 in the shell, the shell is equipped with liquid injection hole 101, the electric core structure and the liquid injection hole between being equipped with liquid separator 206.

[0025] Wherein, the shape of the liquid separator is not limited, for example, the liquid separator can be rectangular, rhombic, etc.

[0026] Wherein, the length of the liquid separator is not limited, for example, the liquid separator cover can be electric core main body.

[0027] Wherein, the fixing mode of the liquid separator is not limited, for example, the liquid separator can be fixed between the electric core structure and the liquid injection hole by sticking, clamping, etc.

[0028] In an embodiment, the width of the liquid separator is greater than or equal to the diameter of the liquid injection hole.

[0029] In an embodiment, the liquid separator is located directly below the liquid injection hole.

[0030] In an embodiment, the liquid separator is provided with a plurality of micropores, and the pore size of the micropores is 0.2mm-0.5mm. By providing the plurality of micropores, the shunt effect can be achieved, and the flow efficiency of the electrolyte can be increased, and the infiltration effect can be improved.

[0031] It can be understood that the processing mode of the micropore is not limited, for example, the pore size distribution of the liquid separator can be changed by punching, or the pore size distribution of the liquid separator can be changed when the liquid separator is produced.

[0032] In an embodiment, the electric core structure includes a first pole piece 202, a second pole piece 203 and a separator 201 between the first pole piece and the second pole piece, the first pole piece is provided with a first tab 204, and the second pole piece is provided with a second tab 205.

[0033] In one embodiment, the liquid separator is arranged between the first tab and the second tab. It can be understood that the arrangement of the liquid separator is not limited, for example, the liquid separator can be arranged between the first tab and the second tab by wrapping.

[0034] In one embodiment, one of the first tab and the second tab is positive polarity, and the other of the first tab and the second tab is negative polarity. For example, the first tab is negative polarity, and the second tab is positive polarity.

[0035] In one embodiment, the shell includes a middle frame and first and second shells arranged on opposite sides of the middle frame, and the liquid injection hole is arranged on the middle frame. It can be understood that the material of the shell is not limited, for example, the shell can be a steel shell, which has high hardness and improves the service life of the battery.

[0036] In one embodiment, the middle frame is provided with first and second pole columns, one of the first and second pole columns is positive polarity, and the other of the first and second pole columns is negative polarity.

[0037] In one embodiment, the positive polarity tab of the first and second tabs is connected to the positive polarity pole column of the first and second pole columns, and the negative polarity tab of the first and second tabs is connected to the negative polarity pole column of the first and second pole columns.

[0038] It can be understood that the negative polarity pole column of the first and second pole columns can be omitted, and when the negative polarity pole column of the first and second pole columns is omitted, the negative polarity tab of the first and second tabs is connected to the shell.

[0039] It can be understood that the battery cell structure of the utility model can be a winding and / or laminated structure.

[0040] The existing winding battery cell structure is mainly prepared by the following method, including the following steps:

[0041] S1: obtaining positive and negative tabs by stirring, coating, rolling, and cutting processes;

[0042] S2: winding the positive and negative tabs and the separator according to the winding process to obtain a winding structure battery cell;

[0043] S3: battery cell into shell, liquid injection.

[0044] The existing laminated cell structure is prepared mainly by the following method, including the following steps:

[0045] S1: obtaining positive and negative electrode sheets through stirring, coating, rolling and slitting processes;

[0046] S2: laminating the positive and negative electrode sheets and the separator according to a lamination process to obtain a laminated structure cell;

[0047] S3: putting the cell into a shell and injecting liquid.

[0048] The winding cell structure of the utility model is prepared mainly by the following method, including the following steps:

[0049] S1: obtaining positive and negative electrode sheets through stirring, coating, rolling and slitting processes;

[0050] S2: winding the positive and negative electrode sheets and the separator according to a winding process to obtain a winding structure cell;

[0051] S3: winding the positive and negative electrode sheets and the separator according to a winding process to obtain a winding structure cell;

[0052] S4: putting the cell into a shell and injecting liquid.

[0053] The laminated cell structure of the utility model is prepared mainly by the following method, including the following steps:

[0054] S1: obtaining positive and negative electrode sheets through stirring, coating, rolling and slitting processes;

[0055] S2: laminating the positive and negative electrode sheets and the separator according to a lamination process to obtain a laminated structure cell;

[0056] S3: winding the positive and negative electrode sheets and the separator according to a winding process to obtain a winding structure cell;

[0057] S4: putting the cell into a shell and injecting liquid.

[0058] The battery of the utility model through being equipped with the liquid isolation piece right below the liquid injection hole, electrolyte contacts the liquid isolation piece first when injecting, the liquid isolation piece can slow down the electrolyte injection pressure, and simultaneously plays the role of shunting, this structure can eliminate the risk of electrolyte overturning the separator, thereby eliminating the short circuit risk, improving the process yield and the cell safety performance, simultaneously, the liquid isolation piece plays the role of shunting, and can increase the electrolyte flow efficiency and improve the infiltration effect through the liquid isolation piece surface micropore treatment on the liquid isolation piece.

[0059] It should be explained finally that the above embodiment is only used to illustrate the technical scheme of the utility model and is not the limit of the protection scope of the utility model, although the utility model is explained in detail with reference to the preferred embodiment, the ordinary skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently without departing from the essence and scope of the technical scheme of the utility model.

Claims

1. A battery, characterized by, The application relates to a battery cell structure, which comprises a shell and an electric cell structure arranged in the shell, a liquid injection hole is arranged on the shell, a liquid separator is arranged between the electric cell structure and the liquid injection hole, the liquid separator is located directly below the liquid injection hole, the shape of the liquid separator is rectangular or rhombic, and a plurality of micropores are arranged on the liquid separator.

2. The battery of claim 1, wherein, The width of the liquid separator is greater than the diameter of the liquid injection hole.

3. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The electric cell structure comprises a first pole piece, a second pole piece and a diaphragm arranged between the first pole piece and the second pole piece, a first lug is arranged on the first pole piece, and a second lug is arranged on the second pole piece.

4. The battery of claim 3, wherein the cathode is a lithium cobalt oxide cathode. The liquid separator is arranged between the first lug and the second lug.

5. The battery of claim 4, wherein the cathode is a lithium cobalt oxide cathode. One of the first pole piece and the second pole piece is of positive polarity, and the other of the first pole piece and the second pole piece is of negative polarity.

6. The battery of claim 5, wherein the cathode is a lithium cobalt oxide cathode. The shell comprises a middle frame and first and second shells arranged on opposite sides of the middle frame, and the liquid injection hole is arranged on the middle frame.

7. The battery of claim 6, wherein the cathode comprises a lithium metal oxide. First and second pole columns are arranged on the middle frame, one of the first and second pole columns is of positive polarity, and the other of the first and second pole columns is of negative polarity.

8. The battery of claim 7, wherein the cathode is a lithium cobalt oxide cathode. The pole piece of positive polarity in the first and second pole pieces is connected with the pole column of positive polarity in the first and second pole columns, and the pole piece of negative polarity in the first and second pole pieces is connected with the pole column of negative polarity in the first and second pole columns.

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