Packaging structure integrating functions of liquid injection plug and explosion-proof valve and packaging battery

Abstract

The utility model relates to a packaging structure integrating functions of a liquid injection plug and an anti-explosion valve and a packaging battery in the field of new energy lithium batteries. Comprising a shell plate used for packaging the battery, a liquid injection hole is formed in the shell plate, a sealing pressing piece used for sealing and covering the liquid injection hole in a matched mode is arranged on the outer side face of the shell plate in a sealed mode, a pressure relief hole communicated with the liquid injection hole is formed in the middle of the sealing pressing piece, and an anti-explosion thin piece used for sealing and covering the pressure relief hole in a matched mode is arranged on the inner side face of the sealing pressing piece in a sealed mode. A cutting edge is reserved on the bottom edge, close to the anti-explosion sheet, of the pressure relief hole. The integrated design of liquid injection and pressure relief of the battery is realized, the functions of the liquid injection plug and the anti-explosion valve are integrated, the pressure relief process is more controllable and directional, and compared with the structure of a traditional laser processing anti-explosion valve, the design has the advantages that the processing cost is reduced, the production efficiency is improved, the precision of the processing process is more controllable, and the production efficiency is improved. And the reliability and the stability of the whole packaging structure are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy lithium battery field, concretely relates to the packaging structure and packaging battery of liquid injection plug and explosion -proof valve function combination. BACKGROUND

[0002] The explosion -proof valve plays a vital role in battery packaging. It can release pressure in time when the internal pressure of the battery abnormally rises, preventing the battery from exploding. Especially in 3C batteries (such as mobile phone batteries, notebook computer batteries, etc.) and power batteries (such as electric vehicle batteries, energy storage batteries, etc.), due to large battery capacity and complex working conditions, the safety and reliability of the explosion -proof valve are particularly important.

[0003] In the prior art, a common explosion -proof valve structure is to set an arc-shaped groove formed by a laser engraving process on the battery packaging cover plate as a pressure relief channel. Although this structure meets the safety requirements of the battery to some extent, it has the problems of high processing cost and low processing efficiency. Because the laser engraving process has very high precision requirements, the tolerance needs to be controlled within a very small range (the tolerance needs to be controlled within + / - 0.001 mm), which leads to low production efficiency and rising costs. In addition, the explosion -proof valve of this structure has deficiencies in directional pressure relief. When the internal pressure of the battery rises, the opening direction and pressure release path of the explosion -proof valve are difficult to accurately control, which may cause safety accidents.

[0004] The liquid injection plug is used to inject electrolyte during battery packaging, and the liquid injection plug is sealed after the electrolyte is injected. The existing liquid injection plug is usually designed as a separate component, which specifically needs to set a liquid injection hole on the packaging shell, and set a liquid injection plug on the liquid injection hole to cover the liquid injection hole.

[0005] In the prior art, the liquid injection plug as a separate component increases the number of components in the battery packaging process, which not only increases the production cost, but also increases the complexity of processing and assembly. In addition, since the liquid injection plug needs to be installed separately, it affects the overall efficiency of the battery packaging UTILITY MODEL CONTENTS

[0006] The first object of the utility model is to solve the above defects, provide the packaging structure of liquid injection plug and explosion -proof valve function combination, it can use the function of liquid injection plug and explosion -proof valve simultaneously, and the processing cost is low, the production efficiency is high, solve the technical problem of being limited by the machining precision in the prior art, and the technical problem of high cost and low efficiency of laser processing.

[0007] The first object of the utility model is realized by the following mode:

[0008] The packaging structure with the functions of the liquid injection plug and the explosion-proof valve is combined, which comprises a shell plate for battery packaging, a liquid injection hole is formed in the shell plate, a sealing pressing sheet for sealing and covering the liquid injection hole is sealingly arranged on the outer side of the shell plate, a pressure relief hole is formed in the middle of the sealing pressing sheet and communicated with the liquid injection hole, an explosion-proof sheet for sealing and covering the pressure relief hole is sealingly arranged on the inner side of the sealing pressing sheet, an outer convex part is arranged on the end surface of the explosion-proof sheet close to the pressure relief hole and protrudes along the direction of the pressure relief hole, and a blade is left on the bottom edge of the pressure relief hole close to the explosion-proof sheet, which is tightly attached to the outer side of the explosion-proof sheet and tightly presses the outer side edge of the outer convex part, so that the maximum pressure that the outer convex part can withstand is less than the maximum pressure that the battery packaged by the shell plate can withstand.

[0009] Further, the shell plate, the sealing pressing sheet and the explosion-proof sheet are all made of stainless steel.

[0010] Further, the thickness of the sealing pressing sheet is 0.05-0.2mm, and the thickness of the explosion-proof sheet is 0.01-0.03mm.

[0011] Further, the shell plate and the sealing pressing sheet are fixed by welding, the sealing pressing sheet is sealingly welded around the periphery of the liquid injection hole, the sealing pressing sheet and the explosion-proof sheet are fixed by welding, and the explosion-proof sheet is sealingly welded around the periphery of the pressure relief hole.

[0012] Further, the outer convex part is arc-shaped.

[0013] Further, the liquid injection hole and the pressure relief hole are circular or elliptical or square.

[0014] The second object of the utility model is to provide a packaging battery, which can reduce the processing cost of battery packaging and improve the production efficiency.

[0015] The second object of the utility model is realized by the following way:

[0016] The packaging battery comprises:

[0017] A stainless steel packaging shell,

[0018] A battery cell packaged in the stainless steel packaging shell,

[0019] and a packaging structure with the functions of the liquid injection plug and the explosion-proof valve combined, which is arranged on the stainless steel packaging shell.

[0020] Further, the stainless steel packaging shell comprises a hollow frame, an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are sealingly combined with the upper end and the lower end of the hollow frame respectively, the packaging structure is arranged on the hollow frame, two mounting holes are left on the side surface of the hollow frame, a spacing is left between the two mounting holes, and a pole assembly is arranged on each of the two mounting holes.

[0021] The utility model discloses the beneficial effect as follows:

[0022] 1) about the packaging structure of the function of the liquid injection plug and the explosion -proof valve combination, through setting up the liquid injection hole on the shell board, and sealingly being equipped with the sealing pressure piece for the matched sealing cover liquid injection hole, and the pressure relief hole of the sealing pressure piece on the opening and the liquid injection hole conduction, realized the integration design of battery liquid injection and pressure relief, made the function of liquid injection plug and explosion -proof valve combination, and the one end surface of explosion -proof sheet near pressure relief hole is equipped with the convex part of the convex part along the direction of pressure relief hole, this design not only enhanced the sealing performance of explosion -proof sheet and pressure relief hole, still through the setting of convex part, made the pressure relief process more controllable and directional, the blade of the bottom edge of pressure relief hole near explosion -proof sheet remains, can be close and press tightly the outside surface of explosion -proof sheet and the outside surface edge of convex part, when the gas is produced in the battery charging and discharging process, the battery internal pressure rises and exceeds the maximum pressure that convex part can bear, the inside of battery packaging shell is pressed after and will push convex part continues to convex, and under the reverse extrusion of blade, will tear the explosion -proof sheet along the edge of convex part, thereby ensured that the explosion -proof sheet can carry out the blast pressure relief along the predetermined direction when receiving enough pressure, realized the function of directional pressure relief;

[0023] 2) install first seal pressure piece and explosion -proof sheet combination and form a closed whole, then again through the tool forming and extruding the shape of convex part, finally again seal the whole seal cover in liquid injection hole, and this design compares with the structure of traditional laser processing explosion -proof valve, not only reduced the processing cost, improved production efficiency, still because the precision of processing process is more controllable, the reliability and stability of entire packaging structure have been improved significantly;

[0024] 3) about the packaging battery, through the design of the packaging structure of the function of liquid injection plug and explosion -proof valve combination, this structure not only simplifies the component quantity in the battery packaging process, also significantly improves the packaging efficiency and production benefit, and the explosion -proof sheet will carry out directional blast along the blade direction, and this function not only improves the safety of battery in the pressure relief process, avoids the dangerous situation such as battery damage or explosion due to excessive pressure, also helps to protect other components of battery and electric product from being damaged, prolongs the service life of battery and electric product. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the three -dimensional structure schematic diagram of the packaging structure of the utility model liquid injection plug and explosion -proof valve function combination;

[0026] Figure 2 It is the structure exploded schematic diagram of the packaging structure of the utility model liquid injection plug and explosion -proof valve function combination;

[0027] Figure 3The utility model discloses a packaging structure of liquid injection plug and explosion-proof valve function combined into one, which is characterized by the following technical scheme.

[0028] Figure 4 The utility model discloses a packaging structure of liquid injection plug and explosion-proof valve function combined into one, which is characterized by the following technical scheme.

[0029] Figure 5 The utility model discloses a packaging structure of liquid injection plug and explosion-proof valve function combined into one, which is characterized by the following technical scheme.

[0030] Figure 6 The utility model discloses a packaging structure of liquid injection plug and explosion-proof valve function combined into one, which is characterized by the following technical scheme.

[0031] Figure 7 The utility model discloses a packaging structure of liquid injection plug and explosion-proof valve function combined into one, which is characterized by the following technical scheme.

[0032] In the figure, 1 is a shell plate, 2 is a liquid injection hole, 3 is a sealing pressing sheet, 4 is a pressure relief hole, 5 is an explosion-proof sheet, 6 is an outer convex part, 7 is a blade edge, 8 is a hollow frame, 9 is an upper cover plate, 10 is a lower cover plate, and 11 is a pole assembly. DETAILED DESCRIPTION

[0033] The utility model will be described in further detail in combination with the drawings and specific embodiments.

[0034] In the embodiment, the packaging structure of liquid injection plug and explosion-proof valve function combined into one is as shown in the accompanying drawings. Figures 1-5 .

[0035] The utility model discloses a packaging structure of liquid injection plug and explosion-proof valve function combined into one, which is characterized by the following technical scheme.

[0036] The utility model discloses a packaging structure of liquid injection plug and explosion-proof valve function combined into one, which is characterized by the following technical scheme.

[0037] The packaging structure of the embodiment is suitable for stainless steel packaging battery, the shell plate 1, the sealing pressing piece 3 and the explosion-proof sheet 5 are all made of stainless steel to ensure good corrosion resistance and mechanical strength. The thickness of the sealing pressing piece 3 is 0.05-0.2mm to ensure that it can provide sufficient sealing performance and will not be too thick and heavy to increase the processing difficulty. The thickness of the explosion-proof sheet 5 is 0.01-0.03mm to be able to burst and release pressure along the predetermined direction when subjected to sufficient pressure, while maintaining sufficient structural strength.

[0038] The processing of the packaging structure of the embodiment with the functions of the liquid injection plug and the explosion-proof valve combined is as follows: the liquid injection hole 2 is opened on the shell plate 1 by stamping process, and the shape of the liquid injection hole 2 can be circular or oval or square to adapt to different battery packaging requirements. The sealing pressing piece 3 is stamped, and the pressure relief hole 4 on the sealing pressing piece 3 is also stamped. The pressure relief hole 4 is formed by stamping, which will leave a blade edge 7 at the bottom edge of the pressure relief hole 4 close to the explosion-proof sheet 5. The shape and size of the pressure relief hole 4 match those of the liquid injection hole 2. The explosion-proof sheet 5 is produced by calendering process. The relatively thick stainless steel plate is thinned and lengthened by stainless steel sheet calendering process, so that the explosion-proof sheet 5 with the required thickness and size is obtained. Then, it is stamped according to the preset size and shape, and the shape of the outer convex part 6 is pressed out by jig forming.

[0039] The assembly process of the packaging structure of the embodiment with the functions of the liquid injection plug and the explosion-proof valve combined is as follows: first, the sealing pressing piece 3 and the explosion-proof sheet 5 are combined to form a closed whole, which can be achieved by welding or other suitable connection methods. In this embodiment, welding is used for fixation. Then, the shape of the outer convex part 6 is pressed out by jig forming to ensure that it meets the design requirements. The outer convex part 6 is arc-shaped to enhance the sealing performance of the explosion-proof sheet 5 and the pressure relief hole 4 and make the pressure relief process more controllable and directional. Finally, the closed whole is sealed on the liquid injection hole 2 and fixed on the shell plate 1 by welding or other suitable connection methods. In this embodiment, welding is used for fixation. Before sealing the liquid injection hole 2, appropriate electrolyte needs to be injected into the packaging battery.

[0040] The packaging battery of the embodiment refers to Figures 6-7 , which includes a stainless steel packaging shell, a battery core (not shown) packaged inside the stainless steel packaging shell, and a packaging structure with the functions of a liquid injection plug and an explosion-proof valve combined. The packaging structure is arranged on the stainless steel packaging shell.

[0041] The specific stainless steel packaging shell comprises a hollow frame 8, an upper cover plate 9 and a lower cover plate 10, all of which are made of stainless steel, the upper cover plate 9 and the lower cover plate 10 are respectively sealed and covered on the upper end and the lower end of the hollow frame 8, and the upper cover plate 9 and the lower cover plate 10 can be welded by using a welding process. The packaging structure is arranged in the hollow frame 8, the shell plate 1 of the packaging structure of the embodiment is an integral structure with the hollow frame 8, the hollow frame 8 can act as the shell plate 1, the packaging structure is arranged on the hollow frame 8, and is used for realizing the functions of liquid injection and pressure relief of the battery. Two mounting holes are left on the side surface of the hollow frame 8, a spacing is left between the two mounting holes, and a pole assembly 11 is arranged on each of the two mounting holes, and the two pole assemblies 11 are respectively electrically connected with the positive electrode and the negative electrode of the battery cell.

[0042] The assembling process of the packaging battery of the embodiment is as follows: first, the lower cover plate 10 is sealed and fixed by being sealed and covered on the lower end of the hollow frame 8 through welding, the battery cell is mounted in the hollow frame 8, then the positive electrode and the negative electrode of the battery cell are respectively welded to the two pole assemblies 11, then the upper cover plate 9 is sealed and fixed by being sealed and covered on the upper end of the hollow frame 8 through welding, finally, the electrolyte is injected into the battery through the liquid injection hole 2, the sealed pressure piece 3 and the explosion-proof sheet 5 are combined to form a sealed whole, the sealed whole is sealed and covered on the liquid injection hole 2, and the sealed whole is fixed on the hollow frame 8 through the welding connection mode and seals the liquid injection hole 2.

[0043] The packaging battery of the embodiment realizes the design of the packaging structure in which the functions of the liquid injection plug and the explosion-proof valve are combined. The design not only simplifies the number of components in the battery packaging process, but also significantly improves the packaging efficiency and production benefit. Meanwhile, the design also enhances the sealing performance of the explosion-proof sheet 5 and the pressure relief hole 4, and makes the pressure relief process more controllable and directional, thereby improving the safety of the battery in the pressure relief process.

[0044] The above is a further detailed description of the utility model in combination with specific preferred embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, some simple deductions or substitutions can be made without departing from the concept of the utility model, and all of them should be regarded as the protection range of the utility model.

Claims

1. A packaging structure in which a liquid injection plug and an explosion-proof valve function are combined, comprising a shell plate for performing battery packaging, characterized in that: The shell plate is provided with a liquid injection hole, and the outer side of the shell plate is sealed with a sealing pressing piece for sealing the liquid injection hole. The middle part of the sealing pressing piece is provided with a pressure relief hole communicated with the liquid injection hole, and the inner side of the sealing pressing piece is sealed with an explosion-proof sheet for sealing the pressure relief hole. The end surface of the explosion-proof sheet close to the pressure relief hole is provided with an outer convex part protruding in the direction of the pressure relief hole. The bottom edge of the pressure relief hole close to the explosion-proof sheet is provided with a blade edge, which is in close contact with the outer side of the explosion-proof sheet and is pressed against the outer side edge of the outer convex part. The maximum pressure that the outer convex part can withstand is less than the maximum pressure that the shell plate can withstand.

2. The encapsulation structure that integrates the functions of the injection plug and the explosion-proof valve as described in claim 1, characterized in that: The shell plate, the sealing pressing piece and the explosion-proof sheet are all made of stainless steel.

3. The encapsulation structure that integrates the functions of the injection plug and the explosion-proof valve as described in claim 1, characterized in that: The thickness of the sealing pressing piece is 0.05-0.2mm, and the thickness of the explosion-proof sheet is 0.01-0.03mm.

4. The package structure of claim 1-3, wherein the package structure is characterized in that: The shell plate and the sealing pressing piece are fixed by welding, and the sealing pressing piece is sealed and welded around the periphery of the liquid injection hole. The sealing pressing piece and the explosion-proof sheet are fixed by welding, and the explosion-proof sheet is sealed and welded around the periphery of the pressure relief hole.

5. The package structure of claim 1-3, wherein the package structure is characterized in that: The outer convex part is arc-shaped.

6. The encapsulation structure that integrates the functions of the injection plug and the explosion-proof valve according to any one of claims 1-3, characterized in that: The liquid injection hole and the pressure relief hole are circular or elliptical or square.

7. A battery pack, characterized by It comprises: a stainless steel packaging shell, an electric core packaged in the stainless steel packaging shell, and the packaging structure of claim 1-6, which integrates the functions of the liquid injection plug and the explosion-proof valve, is arranged on the stainless steel packaging shell.

8. The battery pack of claim 7, wherein: The stainless steel packaging shell comprises a hollow frame, an upper cover plate and a lower cover plate. The upper cover plate and the lower cover plate are respectively sealed and covered on the upper end and the lower end of the hollow frame. The packaging structure is arranged on the hollow frame. The side of the hollow frame is provided with two mounting holes. The two mounting holes are spaced apart, and each mounting hole is provided with a pole assembly.

Images