Lithium battery laminated pole group structure capable of preventing expansion deformation

Abstract

The utility model relates to the technical field of battery manufacturing, in particular to a lithium battery laminated pole group structure capable of preventing expansion deformation, which comprises an outer shell, a laminated pole group is arranged in the outer shell, and support frames positioned on the end surfaces of the two sides of the laminated pole group are arranged on the two sides in the outer shell. A plurality of micropore channels are evenly formed in the supporting frame, elastic diaphragms are arranged in gaps between the micropore channels, convex columns are symmetrically arranged on the inner walls of the two sides of the outer shell, and the convex columns are movably sleeved with the two sides of the supporting frame through penetrating holes; a positioning frame connected with the protruding column is arranged on the inner side of the supporting frame, and manual pressure adjusting assemblies are arranged in the middles of the two sides of the outer shell. The lithium battery laminated pole group structure capable of preventing expansion deformation effectively disperses internal stress in charging and discharging processes, prevents expansion deformation caused by local stress concentration, improves the safety of the battery and prolongs the service life of the battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery manufacturing technical field, concretely is a kind of lithium battery lamination type pole group structure of anti-expansion deformation. BACKGROUND

[0002] With the rapid development of electronic equipment, electric vehicle and energy storage system, the demand for high performance and high safety lithium battery is increasing. Among various types of lithium batteries, lamination type lithium battery is widely concerned due to its small internal resistance, high energy density and long cycle life. The manufacturing process of lamination type lithium battery includes coating positive and negative electrode materials on current collector, cutting into certain size of pole piece, and stacking with separator alternately to form battery cell.

[0003] In the prior art, during the charging and discharging cycle of lamination type lithium battery, the volume of pole piece changes due to lithium ion insertion and extraction, which easily causes local stress concentration of battery cell, and thus causes expansion and deformation of pole group structure. Such expansion and deformation may cause internal short circuit, electrolyte leakage and other problems, which seriously affects the safety and service life of the battery. The current method to solve this problem is to optimize the electrolyte formula or adjust the battery management system to slow down the negative effects caused by pole piece expansion, but these methods cannot fundamentally solve the problem of expansion and deformation caused by structural design. SUMMARY

[0004] The utility model aims at providing a kind of lithium battery lamination type pole group structure of anti-expansion deformation to solve the problem of local stress concentration of battery cell caused by the volume change of pole piece during the charging and discharging process of current lamination type lithium battery, expansion and deformation and the resulting safety and service life decrease.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of lithium battery lamination type pole group structure of anti-expansion deformation, comprising an outer shell, the inside of the outer shell is provided with lamination pole group, both sides of the inside of the outer shell are provided with support frame located at the two side end faces of lamination pole group, a plurality of micropore channels are uniformly provided on the support frame, the gap between the micropore channels is provided with elastic diaphragm, and the inner wall of both sides of the outer shell is symmetrically provided with convex column, both sides of the support frame are movably sleeved on the outside of the convex column through perforation, and the inside of the support frame is provided with positioning frame also connected with the convex column, and the middle of both sides of the outer shell is provided with manual pressure regulating assembly, which is used to adjust the position of the positioning frame relative to the lamination pole group.

[0006] Preferably, both sides of the positioning frame are movably sleeved on the outside of the convex column through perforation, and a compression spring is sleeved on the outside of the part between the support frame and the positioning frame.

[0007] Preferably, the manual pressure regulating assembly on both sides of the outer shell comprises an adjusting stud, a pressing block and a pressure receiving ring, the adjusting stud is inserted into the outer shell through a threaded structure, the pressing block is fixed to one end of the adjusting stud inside the outer shell, and the pressure receiving ring is fixed to the middle of the positioning frame.

[0008] Preferably, the pressure receiving ring corresponds to the position of the pressing block, and the inside of the pressure receiving ring is provided with a pressing opening matched with the structure of the pressing block.

[0009] Preferably, the support frame is fixed with guide columns on both sides, and the positioning frame is provided with through holes matched with the guide columns on both sides.

[0010] Preferably, the positioning frame and the inner wall of the outer shell are symmetrically connected with a rebound column of a telescopic structure, and the outside of the telescopic section of the rebound column is sleeved with a return spring.

[0011] Compared with the prior art, the beneficial effects of the lithium battery laminated pole group structure against swelling deformation are that: the structure effectively disperses the internal stress in the charging and discharging process, prevents swelling deformation caused by local stress concentration, and improves the safety and service life of the battery. The structure can effectively buffer and adapt to the stress caused by volume change through the design of the micropore channel on the support frame 3 and the elastic diaphragm, avoids structural damage caused by local stress concentration, and further ensures that the laminated pole group maintains stable pressure distribution in the charging and discharging cycle, and reduces the swelling risk caused by improper structural design. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a structural schematic view of the lithium battery laminated pole group structure against swelling deformation of the utility model;

[0013] Fig. 2 It is a structural schematic view of the outer side of the support frame of the lithium battery laminated pole group structure against swelling deformation of the utility model;

[0014] Fig. 3 It is a structural schematic view of the inside of the outer shell of the lithium battery laminated pole group structure against swelling deformation of the utility model.

[0015] In the figure: 1, outer shell; 2, laminated pole group; 3, support frame; 4, micropore channel; 5, elastic diaphragm; 6, convex column; 7, positioning frame; 8, compression spring; 9, rebound column; 10, return spring; 11, adjusting stud; 12, pressing block; 13, pressure receiving ring; 14, guide column. DETAILED DESCRIPTION

[0016] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0017] Please refer to Figs. 1-3The utility model provides a technical scheme: a lithium battery lamination type pole group structure of anti -expansion deformation, including shell body 1, shell body 1 is rectangular body structure its top can pass through bolt fixed top cover, the inside of shell body 1 is equipped with lamination pole group 2, both sides in the inside of shell body 1 are equipped with the support frame 3 of being located lamination pole group 2 both sides end face, support frame 3 all uniformly is equipped with a plurality of micro -hole channel 4, and the clearance between every micro -hole channel 4 all is bonded fixed with elastic diaphragm 5, and both sides inner wall of shell body 1 all are fixed with the boss 6 of symmetrical welding, both sides of support frame 3 are through the perforation movable sleeve and set in the outside of boss 6, and the inside of support frame 3 is equipped with also with boss 6 link's positioning frame 7, and the middle of both sides of shell body 1 all are equipped with manual pressure regulating assembly, this manual pressure regulating assembly is used for adjusting the position of positioning frame 7 relative to lamination pole group 2, this structure when battery carries out the charging and discharging cycle process, owing to lithium ion embeds and takes out and leads to the volume change of lamination pole group 2, a plurality of micro -hole channel 4 on support frame 3 allows gas or liquid to pass through, simultaneously elastic diaphragm 5 can adapt and buffer the stress of this volume change, avoid local stress concentration, and support frame 3 can be moved under the pressure action through boss 6 appropriately, and permanent deformation will not be caused, and positioning frame 7 can ensure that can adjust position as needed to adapt the change of lamination pole group 2, simultaneously manual pressure regulating assembly can be through the adjustment positioning frame 7 to control its pressure distribution to lamination pole group 2 accurately, to effectively dispersed internal stress, prevented the swelling deformation problem caused by local stress concentration, this not only has promoted the security and service life of battery, also fundamentally solved the swelling deformation problem of the prior art due to improper structure design, avoided the serious consequences such as internal short circuit and electrolyte leakage possibly caused thereby, both sides of positioning frame 7 also through the perforation movable sleeve and set in the outside of boss 6, and the outside of the part of boss 6 between support frame 3 and positioning frame 7 is equipped with compression spring 8, and both ends of compression spring 8 are connected with the corresponding connection of support frame 3 and positioning frame 7 respectively, this structure when the pressure is unevenly distributed when the volume changes in the battery due to the charging and discharging process, support frame 3 and positioning frame 7 can be fine-tuned along boss 6 and move to adapt to the change, at this time, compression spring 8 elastically adjusts the distance between support frame 3 and positioning frame 7, so that they can automatically adjust position according to the change of internal stress, effectively alleviate the local stress concentration phenomenon, the manual pressure regulating assembly of both sides of shell body 1 includes adjusting stud 11, pressure block 12 and pressure ring 13, adjusting stud 11 is inserted in both sides of shell body 1 through the thread structure, pressure block 12 is welded and fixed at the one end of adjusting stud 11 located in the inside of shell body 1, pressure ring 13 is welded and fixed in the middle of positioning frame 7, and the position of pressure ring 13 corresponds with pressure block 12, and the inside of pressure ring 13 is equipped with the pressure port of being in accord with the structure of pressure block 12, this structure is through the rotation adjusting stud 11, make pressure block 12 move along adjusting stud 11 axial and exert pressure on the pressure port of pressure ring 13,Thus prompting the positioning frame 7 to fine-tune its position along the convex column 6, ensuring that the contact between the support frame 3 and the laminated electrode group 2 is both tight and not excessively compressive, effectively dispersing the internal stress generated during the charging and discharging process, both sides of the support frame 3 are welded and fixed with guide columns 14, and both sides of the positioning frame 7 are provided with through holes matched with the guide columns 14, this structure allows the positioning frame 7 to move linearly along the guide column 14 accurately, which ensures that the positioning frame 7 maintains high stability and directional consistency during the adjustment of its position to adapt to changes in internal stress, avoiding structural instability caused by deviation or inclination, the positioning frame 7 is symmetrically connected with the inner wall of the outer shell 1 with a resilient column 9 of telescopic structure, the telescopic end of the resilient column 9 is fixedly connected with the positioning frame 7, and the telescopic section of the resilient column 9 is externally sleeved with a return spring 10, this structure allows the resilient column 9 to adjust its extension and contraction along its telescopic direction, this telescopic mechanism allows the positioning frame 7 to move flexibly according to changes in internal stress, ensuring that it can always apply appropriate and uniform pressure to the laminated electrode group 2, at the same time, the return spring 10 can provide additional elastic restoring force during the extension and contraction of the resilient column 9, allowing the positioning frame 7 to quickly return to its initial position after the stress is eliminated, further enhancing the stability and response speed of the system.

[0018] Working principle: when using the anti-expansion deformation lithium battery laminated electrode group structure, first install the battery in place and start the charging and discharging process, as lithium ions are inserted and removed, the laminated electrode group 2 will change in volume, at this time the micro-porous channel 4 on the support frame 3 allows gas or liquid to pass through, and the elastic diaphragm 5 adapts to the stress caused by the volume change, the support frame 3 slides outside the convex column 6 through its perforations, allowing it to move appropriately according to changes in internal pressure, when the internal stress changes, the positioning frame 7 can also move linearly along the guide column 14 accurately, maintaining stability and directional consistency, in order to further adjust the position of the positioning frame 7, the adjustment screw 11 in the manual pressure adjusting assembly can push the pressing block 12 to move axially along the adjustment screw 11 by rotating, applying pressure to the pressing port of the pressure receiving ring 13, prompting the positioning frame 7 to fine-tune its position along the convex column 6, thus accurately controlling the pressure distribution on the laminated electrode group 2, during this process, the compression spring 8 provides additional elastic adjustment, allowing the support frame 3 and the positioning frame 7 to automatically adjust their positions according to changes in internal stress, relieving local stress concentration, finally the resilient column 9 and the return spring 10 externally sleeved with it can provide elastic restoring force when the positioning frame 7 extends and contracts with the internal stress, allowing the positioning frame 7 to quickly return to its initial position after the stress is eliminated, ensuring stable operation of the entire system, thus completing a series of work.

[0019] Although the utility model has been explained in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A lithium battery lamination type pole group structure capable of preventing swelling deformation, comprising an outer shell (1), the inside of the outer shell (1) being provided with a lamination type pole group (2), characterized in that: Both sides of the outer shell (1) are provided with support frames (3) on both sides of the end face of the laminated pole group (2), the support frames (3) are uniformly provided with a plurality of micro-hole channels (4), the gaps between the micro-hole channels (4) are provided with elastic diaphragms (5), and the inner walls of the two sides of the outer shell (1) are symmetrically provided with convex columns (6), the two sides of the support frame (3) are movably sleeved on the outside of the convex column (6) through perforation, and the inner side of the support frame (3) is provided with a positioning frame (7) connected with the convex column (6), and the middle of the two sides of the outer shell (1) is provided with a manual pressure regulating assembly for adjusting the position of the positioning frame (7) relative to the laminated pole group (2).

2. The lithium battery stackable pole group structure of claim 1, wherein: The two sides of the positioning frame (7) are movably sleeved on the outside of the convex column (6) through perforation, and the outside of the part of the convex column (6) between the support frame (3) and the positioning frame (7) is sleeved with a compression spring (8).

3. The lithium battery stacked jelly-roll electrode assembly structure of claim 1, wherein: The manual pressure regulating assembly on the two sides of the outer shell (1) comprises an adjusting stud (11), a pressing block (12) and a pressure receiving ring (13), the adjusting stud (11) is inserted into the two sides of the outer shell (1) through a threaded structure, the pressing block (12) is fixed to one end of the adjusting stud (11) inside the outer shell (1), and the pressure receiving ring (13) is fixed to the middle of the positioning frame (7).

4. The lithium battery stacked jelly-roll electrode assembly structure of claim 3, wherein: The position of the pressure receiving ring (13) corresponds to that of the pressing block (12), and the inside of the pressure receiving ring (13) is provided with a pressing port matching the structure of the pressing block (12).

5. The lithium battery stackable pole group structure of claim 1, wherein: Both sides of the support frame (3) are fixed with guide columns (14), and both sides of the positioning frame (7) are provided with through holes matched with the guide columns (14).

6. The lithium battery stackable pole group structure of claim 1, wherein: The positioning frame (7) and the inner wall of the outer shell (1) are symmetrically connected with a rebound column (9) of telescopic structure, and the telescopic section of the rebound column (9) is sleeved with a return spring (10) outside.

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