CN211376775U - Explosion-proof battery - Google Patents

Abstract

The explosion-proof battery of the utility model is provided with a cover body kit, a battery bottom case and a battery core kit. In the actual application process, due to the setting of the isolation rubber ring, when the internal pressure of the explosion-proof battery is too large, the isolation rubber ring will be peeled off from the battery top case, that is, the isolation rubber ring and the battery top case are separated from each other, so that the explosion-proof battery The internal excessive air pressure is released to the external environment to complete the process of autonomous pressure relief, which effectively prevents the explosion-proof battery from being damaged due to the inability to release the excessive air pressure inside the explosion-proof battery in time. The setting of the isolation rubber ring greatly enhances the explosion-proof battery. The safety performance of the explosion-proof battery makes the explosion-proof battery have explosion-proof performance.

Description

Explosion-proof battery

technical field

The utility model relates to the technical field of batteries, in particular to an explosion-proof battery.

Background technique

At present, a battery refers to a part of the space of a cup, tank, or other container or composite container that contains an electrolyte solution and metal electrodes to generate electrical current, a device that converts chemical energy into electrical energy. With positive and negative points. With the advancement of technology, batteries generally refer to small devices that can generate electricity. such as solar cells. The performance parameters of the battery mainly include electromotive force, capacity, specific energy and resistance. Using the battery as an energy source can obtain a current with stable voltage, stable current, stable power supply for a long time, and little external influence, and the battery has a simple structure, easy to carry, simple and easy charging and discharging operations, and is not affected by external climate and temperature. Influence, stable and reliable performance, play a great role in all aspects of modern social life.

For existing batteries, most battery manufacturers have not optimized the safety performance of the battery. We all know that there is battery electrolyte inside the battery, and there will also be a certain internal pressure inside the battery. If the pressure inside the battery is too high If the air pressure inside the battery cannot be released in time, the battery may deform under this condition. In severe cases, the battery may explode due to excessive internal pressure. Once the battery explodes, the battery electrolyte inside the battery may leak or splash out, which will pollute the environment and endanger the personal safety of the battery user. One of the important indicators of performance, the better the explosion-proof performance of the battery, the longer the service life of the battery.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, and to provide a device that can automatically release pressure when the internal air pressure is too large, prevent the internal air pressure from being too large, and have explosion-proof performance and high safety performance. Explosion-proof battery.

The purpose of this utility model is to achieve through the following technical solutions:

An explosion-proof battery, comprising:

a cover kit, the cover kit includes a metal sheet, an isolation rubber ring and a battery top case, the metal sheet is arranged on the isolation rubber ring, the isolation rubber ring is arranged on the battery top case, the The top shell of the battery is provided with an escape hole;

a battery bottom case, a battery accommodating cavity is opened in the battery bottom case, and the battery top case is disposed on the battery bottom case; and

A cell kit, the cell kit includes a bare cell, a first tab and a second tab, the bare cell is arranged in the battery accommodating cavity, and the first tab is respectively connected to the bare cell The cell is connected to the metal sheet, and the second tab is connected to the bare cell and the battery bottom case respectively.

In one embodiment, the isolation rubber ring is disposed on a side surface of the battery top case close to the bare cell, and an explosion-proof wire is disposed on the metal sheet.

In one of the embodiments, the explosion-proof wire is located at the middle position of the metal sheet.

In one embodiment, the isolation rubber ring is disposed on a side surface of the battery top case away from the bare cell.

In one embodiment, the bare cell is a wound bare cell.

In one of the embodiments, the bare cells are stacked bare cells.

In one embodiment, the first tab and the battery top case are attached and welded by resistance welding, and the second tab is attached to the battery bottom case and then welded by resistance welding.

In one embodiment, the cell kit further includes a top insulating member and a bottom insulating member, the top insulating member is disposed between the bare cell and the first tab, and the bottom insulating member is disposed between the bare cell and the second tab.

In one embodiment, the isolation rubber ring is a PP plastic isolation rubber ring.

In one embodiment, the insulating rubber ring has a melting point of 100°C to 500°C.

Compared with the prior art, the advantages and beneficial effects of the present utility model are as follows:

The explosion-proof battery of the utility model is provided with a cover body kit, a battery bottom case and a battery core kit. In the actual application process, due to the setting of the isolation rubber ring, when the internal pressure of the explosion-proof battery is too large, the isolation rubber ring will be peeled off from the battery top case, that is, the isolation rubber ring and the battery top case are separated from each other, so that the explosion-proof battery The internal excessive air pressure is released to the external environment to complete the process of autonomous pressure relief, which effectively prevents the explosion-proof battery from being damaged due to the inability to release the excessive air pressure inside the explosion-proof battery in time. The setting of the isolation rubber ring greatly enhances the explosion-proof battery. The safety performance of the explosion-proof battery makes the explosion-proof battery have explosion-proof performance.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings that need to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of an assembly structure of an explosion-proof battery in an embodiment of the present invention;

2 is a schematic diagram of the internal structure of an explosion-proof battery in an embodiment of the present invention;

Fig. 3 is the enlarged schematic diagram of Fig. 2 at A;

4 is an exploded view of an explosion-proof battery in an embodiment of the present invention;

5 is a schematic diagram of an assembly structure of an explosion-proof battery in another embodiment of the present invention;

6 is a schematic diagram of the internal structure of an explosion-proof battery in another embodiment of the present invention;

Fig. 7 is the enlarged schematic diagram of Fig. 6 at B;

8 is a schematic diagram of an assembly structure of an explosion-proof battery in another embodiment of the present invention;

9 is a schematic diagram of the internal structure of an explosion-proof battery in another embodiment of the present invention;

FIG. 10 is an enlarged schematic view at C in FIG. 9 .

Detailed ways

In order to facilitate the understanding of the present utility model, the present utility model will be more fully described below with reference to the related drawings. The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that, for existing batteries, due to the small size of most batteries, most battery manufacturers have not properly optimized the safety performance of the battery considering the production cost. , There must be battery electrolyte inside the battery. At the same time, there will also be a certain internal pressure inside the battery. If the pressure inside the battery is too large, that is, there is too much gas inside the battery. If the air pressure inside the battery cannot be released in time, The battery may deform under this condition, and in severe cases, the battery may explode due to excessive internal pressure. Once the battery explodes, the battery electrolyte in the battery may leak or splash out. The battery electrolyte is a chemical liquid, which is corrosive to a certain extent. If it leaks to the external environment, it will pollute the environment; If the liquid splashes on the user due to the explosion of the battery, it will seriously endanger the personal safety of the battery user; if the battery electrolyte is accidentally eaten by the battery user, it will also cause great harm to the personal safety of the battery user. Injury, there is a very big safety hazard. Therefore, the explosion-proof performance of the battery is also an important indicator of whether the battery can be used normally, that is, the better the explosion-proof performance of the battery, the higher the safety level of the battery.

Therefore, based on the above problems, the present application discloses an explosion-proof battery including a cover body kit, a battery bottom case and a battery cell kit. The cover body kit includes a metal sheet, an isolation rubber ring and a battery top case, the metal sheet is arranged on the isolation rubber ring, the isolation rubber ring is arranged on the battery top case, and the battery top case is provided with an escape hole; the battery bottom case is provided with The battery accommodating cavity, the battery top shell is arranged on the battery bottom shell; the battery cell kit includes a bare cell, a first tab and a second tab, the bare cell is arranged in the battery accommodating cavity, and the first tab is respectively connected with The bare cell is connected to the top case of the battery, and the second tabs are respectively connected to the bare cell and the bottom case of the battery. In this way, it should be noted that the explosion-proof battery of the present invention is provided with a cover body kit, a battery bottom case and a battery cell kit. In the actual application process, due to the setting of the isolation rubber ring, when the internal pressure of the explosion-proof battery is too large, the isolation rubber ring will be peeled off from the battery top case, that is, the isolation rubber ring and the battery top case are separated from each other, so that the explosion-proof battery The internal excessive air pressure is released to the external environment to complete the process of autonomous pressure relief, which effectively prevents the explosion-proof battery from being damaged due to the inability to release the excessive air pressure inside the explosion-proof battery in time. The setting of the isolation rubber ring greatly enhances the explosion-proof battery. The safety performance of the explosion-proof battery makes the explosion-proof battery have explosion-proof performance.

In order to better describe the explosion-proof battery of the present application in detail, please refer to FIGS. 1 , 2 , 4 , 5 and 8 together. An explosion-proof battery 10 includes a cover body kit 100 , a battery bottom case 200 and Cell kit 300.

In this way, it should be noted that both the cover body kit 100 and the battery bottom case 200 play the role of encapsulation and protection to prevent the internal components of the explosion-proof battery 10 from being damaged; the battery cell kit 300 plays the role of electrical energy storage. When an external electrical device is connected, the battery cell kit 300 transmits the stored electrical energy to the external electrical device to supply power to the external electrical device, so that the external electrical device can work normally.

Please refer to FIG. 3 , FIG. 4 , FIG. 7 and FIG. 10 together. The cover body kit 100 includes a metal sheet 110 , an isolation rubber ring 120 and a battery top case 130 . The metal sheet 110 is disposed on the isolation rubber ring 120 , and the isolation rubber ring 120 It is disposed on the battery top case 130 , and the battery top case 130 is provided with an escape hole.

In this way, it should be noted that both the metal sheet 110 and the battery top case 130 play a role of encapsulation and protection to prevent damage to the internal components of the explosion-proof battery 10; It can make the explosion-proof battery 10 have the function of autonomous pressure relief. Specifically, when the internal pressure of the explosion-proof battery 10 is too large, the isolation rubber ring 120 will be peeled off from the battery top case 130, that is, the isolation rubber ring 120 and the battery top case 130. They are separated from each other, so that the explosion-proof battery 10 can release the excessive air pressure inside to the external environment to complete the process of autonomous pressure relief, which can effectively prevent the explosion-proof battery 10 from being damaged due to the inability to release the excessive air pressure inside the explosion-proof battery 10 in time. The arrangement of the rubber ring 120 greatly enhances the safety performance of the explosion-proof battery 10, so that the explosion-proof battery 10 has the explosion-proof performance.

Please refer to FIGS. 1 , 4 and 8 together. The battery bottom case 200 is provided with a battery accommodating cavity, and the battery top case 130 is disposed on the battery bottom case 200 .

In this way, it should be noted that the battery bottom case 200 plays a role of encapsulation and protection, and meanwhile, the battery bottom case 200 is provided with a battery accommodating cavity, and the battery accommodating cavity is used for accommodating the battery cell kit 300 .

Please refer to FIG. 2 , FIG. 6 and FIG. 9 together. The cell kit 300 includes a bare cell 310 , a first tab 320 and a second tab 330 . The bare cell 310 is disposed in the battery accommodating cavity. The tabs 320 are respectively connected to the bare cell 310 and the metal sheet 110 , and the second tabs 330 are respectively connected to the bare cell 310 and the battery bottom case 200 .

In this way, it should be noted that the bare cell 310 plays the role of electrical energy storage. When the explosion-proof battery 10 is connected to an external electrical device, the bare cell 310 transmits the stored electrical energy to the external electrical device to supply power for it. Make the external electrical equipment work normally; the first tab 320 and the second tab 330 are both used as electrodes of the explosion-proof battery 10 to connect the external electrical equipment and transmit the voltage in the bare cell 310 to the external electrical equipment middle.

It should also be noted that when the assembler assembles the explosion-proof battery 10 , the metal sheet 110 , the isolation rubber ring 120 and the battery top case 130 are stacked in sequence, and the metal sheet 110 , the isolation rubber ring 120 and the battery can be fused together by heat fusion. The top case 130 is assembled together. Under the condition of high temperature, the isolation rubber ring 120 will be integrated with the metal sheet 110 and the battery top case 130 respectively, that is, the assembly of the cover body kit 100 is completed. Before the sheet 110 is in contact with the isolation rubber ring 120, you can refer to the method of the lithium ion battery tab processing technology, first clean and passivate and then perform thermal bonding. The specific principle will not be described in detail, which is well known to those skilled in the art. . Then, the bare cell 310 is placed in the battery accommodating cavity opened in the battery bottom case 200, and liquid is injected into the battery bottom case 200. Then, the assembled metal sheet 110, the isolation rubber ring 120 and the The battery top case 130 is assembled on the battery bottom case 200, and the battery top case 130 is welded to the battery bottom case 200 by welding to complete the welding and sealing work of the explosion-proof battery 10. Finally, the first tab 320 is welded to the metal sheet Step 110 , the second tab 330 is welded on the battery bottom case 200 , and the production process of the explosion-proof battery 10 is completed.

It should also be noted that when the metal sheet 110, the isolation rubber ring 120 and the battery top case 130 are assembled together by means of heat fusion, the welding area between the isolation rubber ring 120 and the metal sheet 110 and the battery top case 130 can be used to To control the explosion-proof performance of the explosion-proof battery 10, when the welding area between the isolation rubber ring 120 and the metal sheet 110 and the battery top case 130 is small, when the internal pressure of the explosion-proof battery 10 is too large, the isolation rubber ring 120 is easier to remove from the battery top case. 130 on stripped down.

Further, referring to FIG. 5 again, in one embodiment, the isolation rubber ring 120 is disposed on one side of the battery top case 130 close to the bare cell 310 , and the metal sheet 110 is provided with an explosion-proof wire 111 .

In this way, it should be noted that when the isolation rubber ring 120 is disposed on the side of the battery top case 130 close to the bare cell 310 , in order to allow the explosion-proof battery 10 to better achieve autonomous pressure relief, the metal sheet 110 will be provided with an explosion-proof Line 111, when the internal pressure of the explosion-proof battery 10 is too large, the internal pressure will burst the explosion-proof wire 111 provided on the metal sheet 110, so that the pressure inside the explosion-proof battery 10 is released to the external environment, preventing the accumulation of the explosion-proof battery 10. damaged due to excessive internal pressure. Specifically, the explosion-proof wire 111 is located at the middle position of the metal sheet. In this way, it should be noted that the explosion-proof wire 111 is located at the middle position of the metal sheet 110 , which can make the entire metal sheet 110 receive uniform force.

Further, please refer to FIG. 3 and FIG. 10 again, in one embodiment, the isolation rubber ring 120 is disposed on a side surface of the battery top case 130 away from the bare cell 310 .

In this way, it should be noted that when the isolation rubber ring 120 is disposed on the side of the battery top case 130 away from the bare cell 310 , there is no need to dispose the explosion-proof wire 111 on the metal sheet 110 . When the internal pressure of the explosion-proof battery 10 exceeds When the internal pressure is high, the isolation rubber ring 120 will be peeled off from the battery top case 130 to complete the self-pressure relief, preventing the explosion-proof battery 10 from accumulating excessive internal pressure and being damaged.

Further, in one embodiment, the bare cell 310 is a wound bare cell.

In this way, it should be noted that the bare cell 310 is a wound bare cell, and the specific structure and principle of the wound bare cell will not be described in detail, and are well known to those skilled in the art.

Further, in one embodiment, the bare cells 310 are stacked bare cells.

In this way, it should be noted that, of course, the bare cell 310 may also be a laminated bare cell, and the specific structure and principle of the laminated bare cell will not be described in detail, which is well known to those skilled in the art.

Further, in one embodiment, the first tab 320 is resistance welded after being attached to the battery top case 130 , and the second tab 320 is attached to the battery bottom case 200 and then welded by resistance welding.

In this way, it should be noted that after the welding and sealing of the explosion-proof battery 10 is completed, the first tab 320 is welded to the battery top case 130 by means of resistance welding. The specific operation is to connect the first tab 320 to the battery. After the top case 130 and the second tabs 320 are attached to the battery bottom case 200 , the two-pin welding head is used to contact the battery top case 130 and the battery bottom case 200 , and the resistance welding is completed after power-on.

It should also be noted that the advantages of parallel seam welding compared with laser welding: usually, laser welding needs to apply overall pressure to the welded parts, and requires excellent flatness and contact. Internal winding core, and resistance welding is that the welding electrode directly presses the welding point, which can squeeze out the liquid on the welding interface to improve the contact, avoid fried welding, and have a better welding effect, the welding head can conduct heat, and the welding temperature is lower to avoid damage to the battery.

Further, in one embodiment, the cell kit 300 further includes a top insulating member and a bottom insulating member, the top insulating member is disposed between the bare cell 310 and the first tab 320 , and the bottom insulating member is disposed on the bare cell 310 and the second tab 330 .

In this way, it should be noted that the top insulating member and the bottom insulating member both play the role of isolation to prevent the short circuit between the first tab 320 and the bare cell 310 and the short circuit between the second tab 330 and the bare cell 310; In addition, the top insulating member and the bottom insulating member can also play the role of heat insulation to prevent the bare cell 310 from being damaged by the heat generated when the first tab 320 and the second tab 330 are welded.

Further, in one embodiment, the isolation rubber ring 120 is a PP plastic isolation rubber ring.

In this way, it should be noted that the specific material of the isolation rubber ring 120 can be flexibly set according to the actual situation, for example, PEK material; another example, PEEK material; another example, PI material. Specifically, the melting point of the isolation rubber ring is 100°C to 500°C.

The explosion-proof battery of the utility model is provided with a cover body kit, a battery bottom case and a battery core kit. In the actual application process, due to the setting of the isolation rubber ring, when the internal pressure of the explosion-proof battery is too large, the isolation rubber ring will be peeled off from the battery top case, that is, the isolation rubber ring and the battery top case are separated from each other, so that the explosion-proof battery The internal excessive air pressure is released to the external environment to complete the process of autonomous pressure relief, which effectively prevents the explosion-proof battery from being damaged due to the inability to release the excessive air pressure inside the explosion-proof battery in time. The setting of the isolation rubber ring greatly enhances the explosion-proof battery. The safety performance of the explosion-proof battery makes the explosion-proof battery have explosion-proof performance.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (10)

1. An explosion-proof battery, comprising:

the battery cover comprises a cover body external member and a cover body external member, wherein the cover body external member comprises a metal sheet, an isolation rubber ring and a battery top shell, the metal sheet is arranged on the isolation rubber ring, the isolation rubber ring is arranged on the battery top shell, and a position avoiding hole is formed in the battery top shell;

the battery top shell is arranged on the battery bottom shell; and

the battery core external member, the battery core external member includes naked electric core, first utmost point ear and second utmost point ear, naked electric core set up in battery holding intracavity, first utmost point ear respectively with naked electric core with the sheetmetal is connected, the second utmost point ear respectively with naked electric core with the battery drain pan is connected.

2. The explosion-proof battery of claim 1, wherein the isolation rubber ring is disposed on a side surface of the battery top case close to the bare cell, and the metal sheet is provided with an explosion-proof wire.

3. The explosion-proof battery as set forth in claim 2, wherein the explosion-proof line is located at a middle position of the metal sheet.

4. The explosion-proof battery of claim 1, wherein the isolation rubber ring is disposed on a side of the battery top case away from the bare cell.

5. The explosion-proof battery of claim 1, wherein the bare cell is a wound bare cell.

6. The explosion-proof battery of claim 1 wherein the bare cell is a laminated bare cell.

7. The explosion-proof battery of claim 1 wherein the first tab is resistance welded to the top battery shell after it is attached and the second tab is resistance welded to the bottom battery shell after it is attached.

8. The explosion-proof battery of claim 1, wherein the cell kit further comprises a top layer insulator and a bottom layer insulator, the top layer insulator being disposed between the bare cell and the first tab, the bottom layer insulator being disposed between the bare cell and the second tab.

9. The explosion-proof battery of claim 1 wherein the isolating rubber ring is a PP plastic isolating rubber ring.

10. The explosion-proof battery as recited in claim 9, wherein the melting point of the isolating rubber ring is 100 ℃ to 500 ℃.

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