CN218101597U - Power Battery - Google Patents

Abstract

The utility model discloses a power battery. The power battery comprises a top cover plate and a top patch, the top patch is arranged on the top cover plate, an explosion-proof valve is arranged on the top cover plate, and a ventilating structure is arranged on the top patch. The air-permeable structure is arranged on the explosion-proof valve to block the explosion-proof valve, and the gas generated in the battery is discharged from the air-permeable structure after the explosion-proof valve is detonated. The power battery provided by the utility model is provided with a ventilating structure on the top patch, and the venting structure blocks the explosion-proof valve, which can prevent foreign matter from falling into the battery through the ventilating structure after the explosion-proof valve detonates, thereby causing secondary damage to the battery. hazards, and when the internal pressure of the battery is too high, the explosion-proof valve ventilates and releases the pressure through the breathable structure, releasing the gas generated inside the battery to prevent the battery from exploding.

Description

Power Battery

technical field

The utility model belongs to the technical field of battery equipment, in particular to a power battery.

Background technique

With the development of modern society and the enhancement of people's awareness of environmental protection, more and more devices choose to use lithium batteries as power sources, such as mobile phones, notebook computers, power tools and electric vehicles, etc., which provides a great opportunity for the application and development of lithium batteries wide open space. Among them, lithium batteries used in electric tools and electric vehicles are generally called power batteries.

In the existing power battery, the explosion-proof valve is generally used to ensure the safety of the battery. When the battery is used improperly, the inside of the battery is easy to produce gas. When the internal pressure of the battery reaches a certain value, the explosion-proof valve will detonate and release the pressure to prevent the battery from exploding. . In the prior art, in order to ensure the performance of the explosion-proof valve and avoid damage to the explosion-proof valve by sharp objects, and to prevent foreign matter and dust from entering the battery through the explosion-proof valve after the explosion-proof valve is detonated, a Protective film, but when the battery is vacuum baked, it is easy to cause the protective film to wrinkle, deform or even fail, which affects the performance of the protective film and the appearance of the battery.

Therefore, there is an urgent need to design a power battery to solve the above-mentioned problems that the protective film is easily wrinkled, deformed or even invalid when the battery is vacuum baked, which affects the performance of the protective film and the appearance of the battery.

Utility model content

In order to solve the technical problem that the protective film is easily wrinkled, deformed or even ineffective during vacuum baking of the battery mentioned in the background technology, which affects the performance of the protective film and the appearance of the battery, a power battery is provided to solve the above problems.

In order to achieve the above object, the specific technical scheme of the power battery of the present utility model is as follows:

A power battery, comprising a top cover plate and a top patch, the top patch is arranged on the top cover plate, an explosion-proof valve is arranged in the top cover plate, a ventilating structure is arranged on the top patch, and the ventilating structure is arranged on the explosion-proof valve, The explosion-proof valve is blocked, and the gas generated in the battery is discharged from the gas-permeable structure after the explosion-proof valve is detonated.

Further, the air-permeable structure includes a first air-permeable strip and a second air-permeable strip, the first air-permeable strip and the second air-permeable strip intersect to form an intersection, and the gas generated in the battery is released by the first air-permeable strip, the second air-permeable strip and the gas after the explosion-proof valve detonates. The intersection of the first ventilation strip and the second ventilation strip is discharged.

Further, the first air-permeable strip and the second air-permeable strip intersect to form a first plugging portion, a second blocking portion, a third blocking portion and a fourth blocking portion, the first blocking portion, the second blocking portion, the second blocking portion The third blocking part and the fourth blocking part block the explosion-proof valve.

Further, the ventilating structure includes the third ventilating strip, the fourth ventilating strip and the fifth ventilating strip, the third ventilating strip, the fourth ventilating strip and the fifth ventilating strip form an I-shaped structure, and the gas generated in the battery is released after the explosion-proof valve detonates. Discharged by the I-shaped structure.

Further, the I-shaped structure includes a fifth sealing part and a sixth sealing part, and the fifth sealing part and the sixth sealing part seal the explosion-proof valve.

Further, the air-permeable structure includes a sixth air-permeable strip, the sixth air-permeable strip is an N-shaped structure, and the gas generated in the battery is discharged from the N-shaped structure after the explosion-proof valve is detonated.

Further, the N-shaped structure includes a seventh blocking part and an eighth blocking part, and the seventh blocking part and the eighth blocking part block the explosion-proof valve.

Further, an explosion-proof through hole is arranged on the top cover plate, and the explosion-proof valve is arranged in the explosion-proof through hole.

Further, the explosion-proof valve is welded to the explosion-proof through hole.

Further, poles are provided on the top cover, through holes are opened on the top patch, and the poles are arranged outside the top patch through the through holes.

The utility model power battery has the following advantages:

By setting the venting structure on the top patch, the venting structure blocks the explosion-proof valve, which can prevent foreign matter from falling into the battery through the venting structure after the explosion-proof valve detonates, thereby causing secondary damage to the battery, and the internal pressure of the battery is too large At this time, the explosion-proof valve ventilates and releases pressure through the breathable structure, releases the gas generated inside the battery, and prevents the battery from exploding.

Description of drawings

Fig. 1 is the structural representation of the power battery of the present utility model;

Fig. 2 is a schematic diagram of the explosion structure of the utility model power battery;

Fig. 3 is a top view of the utility model power battery;

Fig. 4 is the schematic diagram of the enlarged structure of A in Fig. 3;

Fig. 5 is a structural schematic view 1 of the air-permeable structure;

Fig. 6 is a second structural schematic view of the air-permeable structure.

Instructions for marks in the figure:

1. Top cover plate; 11. Explosion-proof through hole; 12. Pole; 13. Liquid injection port; 2. Top patch; 21. Ventilation structure; 211. First ventilation strip; 212. Second ventilation strip; Intersecting part; 214, the third ventilation strip; 215, the fourth ventilation strip; 216, the fifth ventilation strip; 217, the sixth ventilation strip; 221, the first blocking part; 222, the second blocking part; 223, the first Three blocking parts; 224, the fourth blocking part; 225, the fifth blocking part; 226, the sixth blocking part; 227, the seventh blocking part; 228, the eighth blocking part; 3. Explosion-proof valve; 4. Sealing aluminum nails.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present utility model.

The technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not constitute conflicts with each other.

The power battery of the present invention will be described below with reference to accompanying drawings 1 to 6 .

In the prior art, in order to ensure the safety of the power battery, an explosion-proof valve 3 is generally installed on the top cover of the power battery. When an accident occurs to the battery due to improper charging, short circuit or exposure to high temperature and other harsh environments, the high-energy battery will generate a large amount of gas and the temperature will rise sharply, and the gas will burst through the explosion-proof valve 3 and be discharged outside to achieve pressure relief. Purpose, the existence of the explosion-proof valve 3 greatly improves the safety performance of the battery.

In order to ensure the performance of the explosion-proof valve 3 and avoid damage to the explosion-proof valve 3 by sharp objects, and to prevent foreign matter and dust from entering the battery through the explosion-proof port after the explosion-proof valve 3 is detonated, it is generally installed on the upper surface of the explosion-proof valve 3. Protective film, but when the battery is vacuum baked, it is easy to cause the protective film to wrinkle, deform or even fail, which affects the performance of the protective film and the appearance of the battery.

In order to solve the above problems, it is necessary to further improve the existing explosion-proof structure of the top cover, so as to overcome the problems that the existing explosion-proof structure adopts the form of pasting the explosion-proof film, which has uneven appearance and poor effect.

As shown in Figures 1 to 3, the power battery in the utility model includes a top cover plate 1 and a top patch 2, the top patch 2 is arranged on the top cover plate 1, and the top cover plate 1 is provided with an explosion-proof valve 3 , The top patch 2 is provided with a ventilating structure 21, and the venting structure 21 is arranged on the explosion-proof valve 3 to block the explosion-proof valve 3, and the gas generated in the battery is discharged from the ventilating structure 21 after the explosion-proof valve 3 detonates.

By setting the venting structure 21 on the top patch 2, the venting structure 21 blocks the explosion-proof valve 3, which can prevent foreign matter from falling into the battery through the venting structure 21 after the explosion-proof valve 3 detonates, thereby causing secondary damage to the battery. Moreover, when the internal pressure of the battery is too high, the explosion-proof valve 3 ventilates and releases the pressure through the ventilating structure 21 to release the gas generated inside the battery and prevent the battery from exploding. In this embodiment, the protective film and the top patch 2 are integrally designed, and the top patch 2 is directly arranged on the explosion-proof valve 3, while preventing sharp objects from damaging the explosion-proof valve 3, or preventing foreign matter from passing through the breathable structure 21 after the explosion-proof valve 3 detonates. fall into the battery, causing secondary damage to the battery.

Further, as shown in FIG. 1 to FIG. 3 , the top cover plate 1 is provided with an explosion-proof through hole 11 , and the explosion-proof valve 3 is arranged in the explosion-proof through hole 11 , and the explosion-proof valve 3 and the explosion-proof through hole 11 are connected by welding.

Further, as shown in Figures 1 to 3, a pole 12 is provided on the top cover plate 1, and a pole through hole 22 is opened on the top patch 2, and the pole 12 is arranged on the top patch through the pole through hole 22. 2, after the top patch 2 is covered on the top cover plate 1, the pole through hole 22 can also play the role of guiding and positioning, and the pole 12 on the top cover plate 1 is placed in the pole through hole 22. The top cover plate 1 is also provided with a liquid injection port 13. The power battery in the utility model also includes a sealing aluminum nail 4. After the three steps of liquid injection, formation, and volume separation are completed, the sealing aluminum nail 4 covers the liquid injection port 13. , the sealing aluminum nail 4 is welded and sealed with the liquid injection port 13, and is used to block the liquid injection port 13. In this embodiment, disposing the top sticker 2 on the top cover plate 1 is also beneficial to cover the welding mark left when the sealing aluminum nail 4 is welded, so as to ensure the appearance of the battery.

Embodiment one

Further, as shown in Figure 4, the air-permeable structure 21 includes a first air-permeable strip 211 and a second air-permeable strip 212, the first air-permeable strip 211 and the second air-permeable strip 212 intersect to form an intersection 213, and the gas generated in the explosion-proof valve 3 is produced by the first air-permeable strip 212. The first air strip 211 , the second air strip 212 and the intersection 213 of the first air strip 211 and the second air strip 212 are discharged. In this embodiment, the first air-permeable strip 211 and the second air-permeable strip 212 are elongated gaps, which can ensure that the gas generated in the battery is discharged from the gaps after the explosion-proof valve 3 detonates.

Further, as shown in FIG. 4 , the first air-permeable strip 211 and the second air-permeable strip 212 intersect to form a first blocking portion 221 , a second blocking portion 222 , a third blocking portion 223 and a fourth blocking portion 224 . The blocking portion 221 , the second blocking portion 222 , the third blocking portion 223 and the fourth blocking portion 224 block the explosion-proof valve 3 to prevent foreign matter, dust, etc. from falling into the explosion-proof valve 3 . In this embodiment, since the top cover plate 1 is provided with an explosion-proof valve 3, the top patch 2 is directly arranged on the top cover plate 1, and at the same time, the air-permeable structure 21 of the top patch 2 directly blocks the explosion-proof valve 3, and the inside of the battery The gas produced is discharged from the gap between the first air-permeable strip 211, the second air-permeable strip 212 and the intersection 213 of the first air-permeable strip 211 and the second air-permeable strip 212 after the explosion-proof valve 3 is detonated. 3 above, the first air-permeable strip 211 and the second air-permeable strip 212 are all very thin gaps, and impurities such as foreign matter and dust cannot seal the first block part 221, the second block part 222, the third block part 223 and the second block part. The four blocking parts 224 are pushed away, which can prevent foreign matter from falling into the battery through the air-permeable structure 21 after the explosion-proof valve 3 detonates, thereby causing secondary damage to the battery. The setting of this embodiment enables the gas to be discharged to the top by the explosion-proof valve 3 Outside the top patch 2, and impurities such as foreign matter cannot enter the explosion-proof valve 3 from the top patch 2.

Embodiment two

Further, as shown in Figure 5, the other structures of the second embodiment are the same as those of the first embodiment, except that the design of the air-permeable structure 21 is different. Five ventilation strips 216, the third ventilation strip 214, the fourth ventilation strip 215 and the fifth ventilation strip 216 form an I-shaped structure, and the gas generated in the battery is discharged from the I-shaped structure after the explosion-proof valve detonates. In this embodiment, the third air-permeable strip 214 and the fourth air-permeable strip 215 are elongated gaps, which can ensure that the gas generated in the battery is discharged from the gaps after the explosion-proof valve 3 detonates.

Further, as shown in FIG. 5 , the I-shaped structure includes a fifth blocking portion 225 and a sixth blocking portion 226 , and the fifth blocking portion 225 and the sixth blocking portion 226 block the explosion-proof valve 3 . The gas produced in the battery can be discharged from the gap between the third air-permeable strip 214 and the fifth air-permeable strip 216 after the explosion-proof valve 3 is detonated. Both 215 and the fifth air-permeable strip 216 are very thin gaps. When foreign matter, dust and other impurities enter the explosion-proof valve 3 from the I-shaped structure, foreign matter, dust and other impurities cannot block the fifth blocking part 225 and the sixth sealing part 225. Part 226 is pushed away, which can prevent foreign matter from falling into the battery through the ventilating structure 21 after the explosion-proof valve 3 detonates, thus causing secondary damage to the battery. Outside, and impurities such as foreign matter cannot enter the explosion-proof valve 3 from the top sticker 2.

Embodiment three

Further, as shown in Figure 6, the other structures of the second embodiment are the same as those of the first embodiment, except that the design of the air-permeable structure 21 is different. In the third embodiment, the air-permeable structure 21 includes the sixth air-permeable strip 217, and the sixth air-permeable strip 217 is N The gas generated in the battery is discharged from the N-shaped structure after the explosion-proof valve 3 is detonated. In this embodiment, the strip-shaped gap of the sixth air-permeable strip 217 can ensure that the gas generated in the battery is discharged from the gap after the explosion-proof valve 3 is detonated.

Further, as shown in FIG. 6 , the N-shaped structure includes a seventh blocking portion 227 and an eighth blocking portion 228 , and the seventh blocking portion 227 and the eighth blocking portion 228 block the explosion-proof valve 3 . The gas generated in the battery is discharged from the gap between the seventh blocking part 227 and the eighth blocking part 228 after the explosion-proof valve 3 is detonated. Since the air-permeable structure 21 is placed on the explosion-proof valve 3, the sixth air-permeable strip 217 is very thin. When foreign matter, dust and other impurities enter the explosion-proof valve 3 from the I-shaped structure, the foreign matter, dust and other impurities cannot push the seventh blocking part 227 and the eighth blocking part 228 away, which can prevent the foreign matter from entering the explosion-proof valve 3. After the valve 3 detonates, it falls into the battery through the air-permeable structure 21, thereby causing secondary damage to the battery. The setting of this embodiment enables the gas to be discharged from the explosion-proof valve 3 to the outside of the top sticker 2, while foreign matter and other impurities cannot pass through the top sticker. 2 into the explosion-proof valve 3.

In other embodiments, the air-permeable structure 21 on the top patch 2 can also be designed in other forms, which can be an unclosed pattern formed by one or more slits connected by circular arcs, and circular or polygonal air-ventilating holes cannot be used. , the circular or polygonal air vent will form a larger opening in the middle, although it can also play a role in exhausting, but after the explosion-proof valve 3 is detonated, the larger opening will make it easier for larger particles to enter the interior of the battery. Increased battery instability.

The assembly process of the power battery in the utility model is as follows:

During the battery manufacturing process, the explosion-proof valve 3 is set at the explosion-proof through hole 11 on the top cover plate 1, and connected by laser welding, and then the battery cell is electrically connected to the pole 12 of the top cover plate 1, and then the The whole assembly is put into the aluminum shell, and the cover plate assembly is welded and sealed with the aluminum shell. After the sealing is completed, it is baked in vacuum at high temperature. Since the protective film is removed, the protective film will not be damaged or invalid during baking. Appear. In the subsequent liquid injection process, in order to prevent the electrolyte from overflowing from the liquid injection port 13 and flowing into the explosion-proof through hole 11 to corrode the explosion-proof valve 3 during liquid injection, it is necessary to paste the corrosion-resistant electrolyte on the explosion-proof through hole 11 during liquid injection. Adhesive tape, the tape size needs to completely cover the explosion-proof through hole 11. After the aluminum nail 4 seals the liquid injection port 13, the tape is removed, and then the top patch 2 is pasted on the top cover plate 1 to complete the assembly of the entire power battery.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included in the protection scope of the claims of the utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance. Wherein, the terms "first position" and "second position" are two different positions.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Claims (10)

1. A power battery, characterized in that it comprises a top cover plate and a top patch, the top patch is arranged on the top cover plate, an explosion-proof valve is arranged in the top cover plate, a ventilating structure is arranged on the top patch, and the ventilating structure It is installed on the explosion-proof valve to block the explosion-proof valve, and the gas generated in the battery is discharged from the gas-permeable structure after the explosion-proof valve is detonated. 2. The power battery according to claim 1, wherein the air-permeable structure includes a first air-permeable strip and a second air-permeable strip, the first air-permeable strip and the second air-permeable strip intersect to form an intersection, and the gas generated in the battery is in the explosion-proof After the valve detonates, it is discharged from the first ventilating strip, the second ventilating strip and the intersection of the first ventilating strip and the second ventilating strip. 3. The power battery according to claim 2, wherein the first air-permeable strip and the second air-permeable strip intersect to form a first plugging portion, a second blocking portion, a third blocking portion and a fourth blocking portion , the first blocking part, the second blocking part, the third blocking part and the fourth blocking part seal the explosion-proof valve. 4. The power battery according to claim 1, wherein the air-permeable structure comprises a third air-permeable strip, a fourth air-permeable strip and a fifth air-permeable strip, and the third air-permeable strip, the fourth air-permeable strip and the fifth air-permeable strip form a process I-shaped structure, the gas generated in the battery is discharged from the I-shaped structure after the explosion-proof valve is detonated. 5. The power battery according to claim 4, characterized in that, the I-shaped structure includes a fifth blocking portion and a sixth blocking portion, and the fifth blocking portion and the sixth blocking portion block the explosion-proof valve . 6. The power battery according to claim 1, wherein the air-permeable structure includes a sixth air-permeable strip, the sixth air-permeable strip is an N-shaped structure, and the gas generated in the battery is discharged from the N-shaped structure after the explosion-proof valve is detonated. 7 . The power battery according to claim 6 , wherein the N-shaped structure includes a seventh blocking portion and an eighth blocking portion, and the seventh blocking portion and the eighth blocking portion block the explosion-proof valve. 8. The power battery according to claim 1, wherein an explosion-proof through hole is arranged on the top cover, and the explosion-proof valve is arranged in the explosion-proof through hole. 9. The power battery according to claim 8, wherein the explosion-proof valve is welded to the explosion-proof through hole. 10. The power battery according to claim 1, wherein a pole is provided on the top cover, a through hole is opened on the top sticker, and the pole is arranged outside the top sticker through the through hole.

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