Square soft package lithium battery

Abstract

The utility model discloses a square soft package lithium battery which comprises a soft package lithium battery body, electrode connecting plates are arranged on the outer wall of one end of the soft package lithium battery body respectively, an exhaust hole is formed between the two electrode connecting plates and located in the soft package lithium battery body, and an activated carbon layer is installed in the exhaust hole. The soft package lithium battery comprises a soft package lithium battery body, a vent hole is formed in the soft package lithium battery body, a pressure relief mechanism is fixedly installed outside the vent hole and located on the outer surface of the soft package lithium battery body, the soft package lithium battery body further comprises a positive plate, a negative plate and a diaphragm, and the positive plate and the negative plate are separated through the diaphragm. The soft package battery has the advantages that excessive accumulation of gas in the soft package battery is avoided, a good pressure relief use effect is achieved, bulging expansion caused by gas accumulation in the lithium battery can be effectively avoided, expansion explosion of the lithium battery can be effectively avoided, good use safety is achieved, and potential safety hazards in use are reduced; and meanwhile, the service life of the soft package lithium battery can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a square soft-pack lithium battery. Background Art

[0002] Soft-pack lithium batteries are just liquid lithium-ion batteries covered with a polymer shell. They are structurally packaged with aluminum-plastic film. In the event of a safety hazard, the soft-pack battery will only burst due to inflation or release energy from the seal. It does not have the risk of explosion like hard-pack lithium batteries.

[0003] A cell is a single electrochemical cell containing positive and negative electrodes. It is generally not used directly. It is different from a battery that contains a protection circuit and a shell and can be used directly. The composition of a lithium-ion secondary rechargeable battery is as follows: a cell + a protection circuit board. The rechargeable battery without the protection circuit board is the cell. It is the power storage part of the rechargeable battery. The quality of the cell directly determines the quality of the rechargeable battery.

[0004] However, the battery cells of traditional soft-pack lithium batteries are not provided with a pressure relief mechanism. For example, the utility model patent with patent number: 202121198624.0 specifically provides a battery cell and a soft-pack battery, the battery cell includes a positive electrode sheet, a negative electrode sheet, a positive electrode ear, a negative electrode ear and a diaphragm, the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet and the positive electrode ear are welded to form a positive electrode welding area, the negative electrode sheet and the negative electrode ear are welded to form a negative electrode welding area, the positive electrode welding area and the negative electrode welding area are coated with graphene coating, the graphene coating has good conductivity, so the setting of the graphene coating can increase the contact internal resistance of the positive electrode welding area and the negative electrode welding area, reduce the heat generated by the positive electrode welding area and / or the negative electrode welding area, thereby reducing the safety hazard caused by excessive temperature to a certain extent.

[0005] Based on the search of the above patents and in combination with the use of existing soft-pack batteries, it was found that soft-pack lithium batteries will produce gas due to overcharge and over-discharge, and oxidation and decomposition of the electrolyte during use. If the internal gas cannot be depressurized in time, the high-pressure gas will cause the soft-pack lithium battery to swell. If the soft-pack lithium battery swells to a certain extent, it is very likely to explode, posing certain safety hazards. Utility Model Content

[0006] The purpose of the utility model is to provide a square soft-pack lithium battery to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a square soft-pack lithium battery, comprising a soft-pack lithium battery body, wherein the outer wall of one end of the soft-pack lithium battery body is respectively provided with an electrode sheet, an exhaust hole is opened between the two electrode sheets and located on the soft-pack lithium battery body, an activated carbon layer is installed in the exhaust hole, and a pressure relief mechanism is fixedly installed outside the exhaust hole and located on the outer surface of the soft-pack lithium battery body, the soft-pack lithium battery body also includes a positive electrode sheet, a negative electrode sheet and a diaphragm, the positive electrode sheet and the negative electrode sheet are separated by the diaphragm, and an electrolyte is arranged inside the soft-pack lithium battery body.

[0008] Preferably, the pressure relief mechanism includes a pressure relief piece, which is installed outside the exhaust hole. The interior of the pressure relief piece is a hollow structure, and the hollow structure inside the pressure relief piece forms an inner cavity. Pressure relief holes are opened on the outer walls on both sides of the pressure relief piece.

[0009] Preferably, the pressure relief hole is designed as a through hole structure, and the pressure relief hole is interconnected with the inner cavity.

[0010] Preferably, an inner sealing gasket is fixedly and slidably installed inside the pressure relief component, a sealing ring is bonded to the outer ring of the inner sealing gasket by glue, and the inner sealing gasket is sealingly connected to the inner wall of the pressure relief component through the sealing ring.

[0011] Preferably, a sliding column is provided at the center position of the upper surface of the inner sealing gasket, and the top end of the sliding column passes through the pressure relief piece and is fixedly connected with an upper limit cap.

[0012] Preferably, an upper limit ring is installed inside the pressure relief component, and the diameter of the upper limit ring is smaller than the diameters of the inner sealing gasket and the upper limit cap.

[0013] Preferably, the sliding post passes through the upper limit ring, and the sliding post is slidably connected to the upper limit ring.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model can effectively discharge the gas generated by the electrolyte in time, avoid excessive accumulation of gas inside the soft-pack battery, have a good pressure relief effect, and can effectively avoid the bulging phenomenon caused by gas accumulation inside the lithium battery, thereby effectively avoiding the expansion and explosion of the lithium battery, having good safety in use, reducing safety hazards in use, and at the same time effectively prolonging the service life of the soft-pack lithium battery of the utility model;

[0016] When the pressure relief mechanism's inner sealing gasket is not performing pressure relief work, it will be placed below the pressure relief hole. As shown in the attached figure of the specification, the inner sealing gasket is placed below the pressure relief hole to effectively prevent external air from entering the lithium battery through the exhaust hole. It has a certain isolation and sealing performance, avoids gas corrosion, improves safety of use and service life, and has a good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall external structure of a soft-pack lithium battery according to an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the exhaust hole structure of an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of a soft-pack lithium battery according to an embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the overall external structure of the pressure relief mechanism of an embodiment of the utility model;

[0021] Figure 5 It is a schematic diagram of the internal cutaway structure of the pressure relief mechanism of an embodiment of the utility model.

[0022] In the figure: 1. soft-pack lithium battery body; 101. positive electrode sheet; 102. diaphragm; 103. negative electrode sheet; 2. electrode sheet; 3. exhaust hole; 4. pressure relief mechanism; 401. pressure relief part; 402. inner cavity; 403. pressure relief hole; 404. inner sealing gasket; 405. sealing ring; 406. upper limit ring; 407. sliding column; 408. upper limit cap. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1-5 , the utility model provides an embodiment: a square soft-pack lithium battery, including a soft-pack lithium battery body 1, the outer wall of one end of the soft-pack lithium battery body 1 is respectively provided with an electrode sheet 2, the two electrode sheets 2 are respectively a positive electrode sheet and a negative electrode sheet, an exhaust hole 3 is opened between the two electrode sheets 2 and located on the soft-pack lithium battery body 1, an activated carbon layer (blocked in the figure, not shown) is installed in the exhaust hole 3, and the activated carbon layer is filled with activated carbon. In actual use, the air discharged through the exhaust hole can pass through the activated carbon layer, so that the electrolyte gas is purified and adsorbed by the activated carbon, and the air odor is reduced, which has a good use effect. A pressure relief mechanism 4 is fixedly installed outside the exhaust hole 3 and located on the outer surface of the soft-pack lithium battery body 1, and the air discharged through the exhaust hole 3 can be subjected to pressure relief and exhaust treatment in the pressure relief mechanism 4;

[0027] Among them, the soft-pack lithium battery body 1 also includes a positive electrode sheet 101, a negative electrode sheet 103 and a diaphragm 102. The positive electrode sheet 101 and the negative electrode sheet 103 are separated by the diaphragm 102. An electrolyte is arranged inside the soft-pack lithium battery body 1. The above structure is a common internal use structure of existing soft-pack lithium batteries. It is a public prior art among technicians in this field and will not be elaborated in this specification.

[0028] In this embodiment, the pressure relief mechanism 4 includes a pressure relief member 401, which is installed outside the exhaust hole 3. The interior of the pressure relief member 401 is a hollow structure, and the hollow structure inside the pressure relief member 401 forms an inner cavity 402. Pressure relief holes 403 are opened on the outer walls on both sides of the pressure relief member 401.

[0029] The pressure relief hole 403 is designed as a through hole structure, and the pressure relief hole 403 is interconnected with the inner cavity 402, so that air can be discharged through the inner cavity 402 of the pressure relief member 401 and the pressure relief hole 403;

[0030] Furthermore, an inner sealing gasket 404 is fixedly and slidably installed inside the pressure relief component 401, and a sealing ring 405 is bonded to the outer ring of the inner sealing gasket 404 by glue. The inner sealing gasket 404 is sealed and connected to the inner wall of the pressure relief component 401 through the sealing ring 405. The inner sealing gasket 404 can ensure the sealing inside the pressure relief component 401, prevent external gas from entering the lithium battery through the pressure relief mechanism 4 and the exhaust hole 3, avoid air corrosion, and has a good sealing protection effect.

[0031] In this embodiment, a sliding column 407 is provided at the center of the upper surface of the inner sealing gasket 404, and the top end of the sliding column 407 passes through the pressure relief member 401 and is fixedly connected to an upper limit cap 408;

[0032] Furthermore, an upper limit ring 406 is installed inside the pressure relief member 401. The diameter of the upper limit ring 406 is smaller than the diameters of the inner seal 404 and the upper limit cap 408, so that the inner seal 404 can be limited inside the pressure relief member 401 to prevent the inner seal 404 from falling out of the pressure relief member 401, thereby improving the use effect of the structure;

[0033] Furthermore, the sliding post 407 passes through the upper limit ring 406 , and the sliding post 407 is slidably connected to the upper limit ring 406 .

[0034] Working principle: Those skilled in the art can use the soft-pack lithium battery of the utility model through conventional methods;

[0035] The utility model provides an exhaust hole 3 on the soft-pack lithium battery. When the lithium battery generates gas due to use problems, the generated gas can be discharged through the exhaust hole 3. An activated carbon layer is provided inside the exhaust hole 3, and the activated carbon layer is filled with activated carbon. In actual use, the air discharged through the exhaust hole can pass through the activated carbon layer, so that the activated carbon can purify and adsorb the electrolyte gas, reduce the odor of the air, and have a better use effect.

[0036] The high-pressure air discharged from the exhaust hole 3 can enter the pressure relief mechanism 4. The high-pressure air entering the pressure relief mechanism 4 can push the inner sealing gasket 404 inside the inner cavity 402, so that the inner sealing gasket 404 moves upward. In the process of the inner sealing gasket 404 moving upward, the inner sealing gasket 404 passes through the pressure relief hole 403. The pressure relief hole 403 will be opened after there is no sealing obstruction of the inner sealing gasket 404, so that the inside and the outside are connected. At this time, the high-pressure air can be discharged through the pressure relief hole 403, which has a good air pressure relief effect. After the pressure relief work is completed, the upper limit cap 408 can be manually pressed at this time, so that the upper limit cap 408 drives the inner sealing gasket 404 below to move downward, so that the exhaust hole 3 can be sealed again;

[0037] In actual use, the utility model can effectively discharge the gas generated by the electrolyte in time, avoid excessive accumulation of gas inside the soft-pack battery, have a good pressure relief effect, and can effectively avoid the bulging phenomenon caused by gas accumulation inside the lithium battery, thereby effectively avoiding the expansion and explosion of the lithium battery, having good safety in use, reducing safety hazards in use, and at the same time effectively prolonging the service life of the soft-pack lithium battery of the utility model;

[0038] When the pressure relief mechanism 4 is not in pressure relief operation, the inner sealing gasket 404 is placed below the pressure relief hole 403. Figure 5 As shown, the inner sealing gasket 404 is placed below the pressure relief hole 403 to effectively prevent external air from entering the lithium battery through the exhaust hole 3, has a certain degree of isolation and sealing, avoids gas corrosion, improves safety and service life, and has a good use effect.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A square soft-pack lithium battery, comprising a soft-pack lithium battery body (1), characterized in that: The outer wall of one end of the soft-pack lithium battery body (1) is respectively provided with an electrode sheet (2); an exhaust hole (3) is provided between the two electrode sheets (2) and located on the soft-pack lithium battery body (1); an activated carbon layer is installed in the exhaust hole (3); a pressure relief mechanism (4) is fixedly installed outside the exhaust hole (3) and located on the outer surface of the soft-pack lithium battery body (1); the soft-pack lithium battery body (1) also includes a positive electrode sheet (101), a negative electrode sheet (103) and a diaphragm (102); the positive electrode sheet (101) and the negative electrode sheet (103) are separated by the diaphragm (102); and an electrolyte is provided inside the soft-pack lithium battery body (1).

2. A square soft-pack lithium battery according to claim 1, characterized in that: The pressure relief mechanism (4) comprises a pressure relief component (401), wherein the pressure relief component (401) is installed outside the exhaust hole (3), the interior of the pressure relief component (401) is a hollow structure, the hollow structure inside the pressure relief component (401) forms an inner cavity (402), and pressure relief holes (403) are provided on the outer walls on both sides of the pressure relief component (401).

3. A square soft-pack lithium battery according to claim 2, characterized in that: The pressure relief hole (403) is designed as a through hole structure, and the pressure relief hole (403) is interconnected with the inner cavity (402).

4. A square soft-pack lithium battery according to claim 2, characterized in that: An inner sealing gasket (404) is fixedly and slidably installed inside the pressure relief component (401), and a sealing ring (405) is bonded to the outer ring of the inner sealing gasket (404) by glue. The inner sealing gasket (404) is sealed and connected to the inner wall of the pressure relief component (401) via the sealing ring (405).

5. A square soft-pack lithium battery according to claim 4, characterized in that: A sliding column (407) is provided at the center position of the upper surface of the inner sealing gasket (404), and the top end of the sliding column (407) passes through the pressure relief piece (401) and is fixedly connected to an upper limit cap (408).

6. A square soft-pack lithium battery according to claim 2, characterized in that: An upper limit ring (406) is installed inside the pressure relief component (401), and the diameter of the upper limit ring (406) is smaller than the diameters of the inner sealing gasket (404) and the upper limit cap (408).

7. A square soft-pack lithium battery according to claim 5, characterized in that: The sliding post (407) passes through the upper limit ring (406), and the sliding post (407) is slidably connected to the upper limit ring (406).

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