Novel stop frame for preventing inward insertion of tab and battery pack

Abstract

The utility model discloses a novel stop frame for preventing inward insertion of a tab and a battery pack, and belongs to the technical field of battery manufacturing. Comprising a frame body fixed at one end of a battery cell, a first inclined guide plate extending along a first direction and a second inclined guide plate extending along a second direction are arranged on the frame body, and a tab through hole is formed between the root part of the first inclined guide plate and the root part of the second inclined guide plate; and the extension part of the first inclined guide plate and the extension part of the second inclined guide plate form a restraining opening. The technical scheme has the beneficial effects that the root parts of the tabs are restrained through the tab through holes and the two inclined guide plates, so that the tab fixing effect is good, the root parts of the tabs are prevented from being bent, and the tabs are prevented from being inserted inwards.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a stop bracket and a battery pack. Background Technology

[0002] In recent years, with the rapid development of lithium battery technology, the application of lithium batteries has covered multiple industries, including electric vehicles, consumer electronics, energy storage, aerospace, and medical equipment, profoundly impacting people's daily lives. Therefore, the safety of lithium batteries has gradually become a focus of public attention, especially safety hazards such as spontaneous combustion and fire. Circuit problems caused by the contact between the battery's internal tabs and the cell have become a common safety hazard.

[0003] In lithium-ion batteries, the tabs within the cell have poor shape restraint. If the tabs fail to make firm contact with the cell electrodes during manufacturing, a short-circuit test may pass. However, when the battery moves to subsequent processes and is installed in an electric vehicle, the tabs' fixation may be affected by bumps or vibrations on complex road conditions. In this case, the loosely fixed tabs may come into contact with the cell, causing a short circuit, which could lead to battery overheating or even fire, posing a significant risk to vehicle and occupant safety. Utility Model Content

[0004] The purpose of this utility model is to provide a novel stop bracket for preventing the insertion of the electrode tab, thereby solving the above-mentioned technical problems;

[0005] The purpose of this utility model is also to provide a battery pack that solves the above-mentioned technical problems;

[0006] A novel stop for preventing electrode insertion includes,

[0007] A frame is fixed to one end of the battery cell. The frame is provided with a first inclined guide plate extending in a first direction and a second inclined guide plate extending in a second direction. A tab through hole is opened between the root of the first inclined guide plate and the root of the second inclined guide plate. The extension of the first inclined guide plate and the extension of the second inclined guide plate form a restraint opening.

[0008] Preferably, the tab through hole is rectangular, the length of the tab through hole is 5mm to 9mm, and the width of the tab through hole is 4mm to 5mm.

[0009] Preferably, the electrode through hole is 4mm to 5mm away from the bottom of the frame.

[0010] Preferably, the tilt angle of the first inclined guide plate is 20° to 30°, and the tilt angle of the second inclined guide plate is 20° to 30°.

[0011] The tilt angle of the first inclined guide plate is greater than the tilt angle of the second inclined guide plate.

[0012] Preferably, the thickness of the first inclined guide plate is 0.5mm to 1mm, and the length of the first inclined guide plate is 2mm to 3mm;

[0013] The thickness of the second inclined guide plate is 0.5mm to 1mm, and the length of the second inclined guide plate is 2mm to 3mm.

[0014] Preferably, the length of the frame is 11mm to 15mm, and the width of the frame is 19mm to 22mm.

[0015] Preferably, the length of the restraint opening is 5mm to 9mm, and the width of the restraint opening is 2mm to 3mm.

[0016] Preferably, it further includes liquid inlet holes, which are located on both sides of the tab through hole, and the number of liquid inlet holes is 6 to 9.

[0017] Preferably, the liquid inlet hole is circular, and the diameter of the liquid inlet hole is 4mm to 6mm.

[0018] A battery pack includes a battery module, the battery module including at least two cells, one end of each cell having a stop frame and a cover plate that engages with the stop frame, the stop frame having an electrode tab that passes through an electrode tab through hole, one end of the electrode tab being connected to an electrode inside the cell, and the other end of the electrode tab abutting against the cover plate to form a bent portion.

[0019] The beneficial effects of this utility model are: by constraining the root of the electrode ear through the electrode ear through hole and two inclined guide plates, the electrode ear is well fixed, preventing the root of the electrode ear from bending and avoiding the electrode ear from being inserted into the hole. Attached Figure Description

[0020] Figure 1 This is a front view of the stop frame of this utility model;

[0021] Figure 2 This is a side sectional view of the stop frame of this utility model;

[0022] Figure 3 This is a top view of the stop frame of this utility model;

[0023] Figure 4 This is a schematic diagram of the assembly of the stop frame and the battery cell of this utility model;

[0024] Figure 5 This is a schematic diagram of the assembly of the stop frame and cover plate of this utility model.

[0025] In the attached diagram: 1. Frame; 2. Battery cell; 3. First inclined guide plate; 4. Second inclined guide plate; 5. Electrode through hole; 6. Restraint port; 7. Liquid inlet hole; 8. Cover plate; 9. Electrode. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0029] A novel stop for preventing insertion of the electrode tab, such as Figures 1 to 5 As shown, including,

[0030] The frame 1 is fixed to one end of the battery cell 2. The frame 1 is provided with a first inclined guide plate 3 extending in a first direction and a second inclined guide plate 4 extending in a second direction. A tab through hole 5 is opened between the root of the first inclined guide plate 3 and the root of the second inclined guide plate 4. The extension of the first inclined guide plate 3 and the extension of the second inclined guide plate 4 form a restraint opening 6.

[0031] Specifically, this utility model provides a novel stop frame for preventing the electrode tab 9 from inserting internally. The electrode tab through hole 5 is formed by the first inclined guide plate 3 and the second inclined guide plate 4. The electrode tab through hole 5 is an offset asymmetrical opening structure. The electrode tab through hole 5 cooperates with the two inclined guide plates to effectively make the electrode tab 9 offset, making it easier to form a bent structure when bending. The electrode tab through hole 5 can bind the root of the electrode tab 9, with a good fixing effect, preventing the root from bending and avoiding the electrode tab 9 from inserting internally.

[0032] In a preferred embodiment, the tab through hole 5 is rectangular, with a length of 5mm to 9mm and a width of 4mm to 5mm. This ensures that the tab 9 can be smoothly inserted, while also providing sufficient binding force after the tab 9 is inserted to prevent unnecessary bending or displacement of the base of the tab 9.

[0033] The distance between the through hole 5 of the pole ear and the bottom of the frame 1 is 4mm to 5mm.

[0034] Specifically, the tab through-hole 5 is rectangular, which helps ensure that the tab through-hole 5 has sufficient guiding space, while also allowing for precise control of the shape and position of the tab 9. This ensures a tighter fit between the tab 9 and the frame 1, providing stronger fixing force.

[0035] When the extension of tab 9 is bent, pressure is generated at the root of tab 9. By precisely controlling the hole size, the pressure can be relieved and the tab 9 can be prevented from being inserted into the hole during installation.

[0036] The electrode through hole 5 is 4mm to 5mm away from the bottom of the frame 1, which can effectively avoid excessive friction and unnecessary pressure concentration, and reduce the possibility of electrode 9 bending and positional displacement.

[0037] In a preferred embodiment, the tilt angle of the first inclined guide plate 3 is 20° to 30°, and the tilt angle of the second inclined guide plate 4 is 20° to 30°.

[0038] The tilt angle of the first inclined guide plate 3 is greater than the tilt angle of the second inclined guide plate 4.

[0039] The size of the restraint opening 6 is smaller than the size of the electrode through hole 5. The length of the restraint opening 6 is 5mm to 9mm, and the width of the restraint opening 6 is 2mm to 3mm.

[0040] Specifically, the first inclined guide plate 3 and the second inclined guide plate 4 are not parallel. The inclination angle of the first inclined guide plate 3 is greater than that of the second inclined guide plate 4, forming a restraint opening 6 smaller than the tab through hole 5. Since the material of the tab 9 is relatively soft, the larger tab through hole 5 can facilitate the connection of the tab 9 to the battery cell 2, while the smaller restraint opening 6 can effectively prevent the tab 9 from being inserted into the battery cell.

[0041] The tilt angle of the inclined guide plate can also reduce the pressure applied to the end of the cell 2 when the end of the tab 9 is bent.

[0042] In a preferred embodiment, the thickness of the first inclined guide plate 3 is 0.5 mm to 1 mm, and the length of the first inclined guide plate 3 is 2 mm to 3 mm.

[0043] The thickness of the second inclined guide plate 4 is 0.5mm to 1mm, and the length of the second inclined guide plate 4 is 2mm to 3mm.

[0044] Specifically, a thickness of 0.5mm to 1mm ensures that the guide plate has sufficient strength and rigidity to withstand the mechanical loads on the electrode tabs 9 during insertion, bending, and restraint. This effectively fixes and guides the electrode tabs 9, ensuring the structural stability of the stop frame.

[0045] The length of 2mm to 3mm ensures that the first inclined guide plate 3 and the second inclined guide plate 4 provide sufficient contact surface for the electrode 9 during the guiding process. Through the shape and offset design of the inclined guide plate, the electrode 9 is gradually guided to bend in the correct direction, preventing the electrode 9 from being inserted into the root or excessively bent.

[0046] In a preferred embodiment, the length of the frame 1 is 11mm to 15mm, and the width of the frame 1 is 19mm to 22mm.

[0047] Specifically, the structure provides support and clamping to ensure that the tab 9 is effectively constrained and prevents insertion and bending.

[0048] In a preferred embodiment, it further includes liquid inlet holes 7, which are disposed on both sides of the tab through hole 5, and the number of liquid inlet holes 7 is 6 to 9.

[0049] Specifically, the liquid inlet hole 7 is used for the electrolyte to enter and wet the battery cell 2. Multiple liquid inlet holes 7 are set on both sides of the tab through hole 5, which can disperse the pressure of liquid entering, reduce the occurrence of local high pressure areas, and also avoid the efficiency reduction caused by excessively long liquid flow path.

[0050] In a preferred embodiment, the liquid inlet 7 is circular, and the diameter of the liquid inlet 7 is 4mm to 6mm.

[0051] Specifically, the geometry of the circular orifice allows fluid to flow along the path of least resistance, avoiding flow resistance caused by sharp angles and edges, which helps reduce pressure drop and ensures a smoother and more stable liquid flow.

[0052] A battery pack includes a battery module, the battery module including at least two battery cells 2, one end of the battery cell 2 is provided with a stop frame and a cover plate 8 that is fastened to the stop frame, the stop frame is provided with a tab 9, the tab 9 passes through a tab through hole 5, one end of the tab 9 is connected to an electrode inside the battery cell 2, and the other end of the tab 9 abuts against the cover plate 8 to form a bent portion.

[0053] Specifically, this utility model also provides a battery pack where the stop bracket and cover plate 8 are fastened together to form a pre-bent shape, facilitating secondary cover bending and preventing the tab 9 from contacting the aluminum shell sidewall during bending, thus avoiding the safety hazard of shell corrosion. The tab through hole 5 and the inclined guide plate cooperate to fix the shape of the root tab 9, preventing the tab 9 from inserting into the cell 2 during bending and assembly, which could cause a short circuit. Even in complex road conditions, the shape of the tab 9 inside the cell 2 will not change, achieving a good restraint effect. The defect rate is reduced from 5% to 0%.

[0054] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel stopper for preventing insertion of the electrode tab, characterized in that, include, A frame is fixed to one end of the battery cell. The frame is provided with a first inclined guide plate extending in a first direction and a second inclined guide plate extending in a second direction. A tab through hole is opened between the root of the first inclined guide plate and the root of the second inclined guide plate. The extension of the first inclined guide plate and the extension of the second inclined guide plate form a restraint opening.

2. The novel anti-intervention stop frame for the electrode tab as described in claim 1, characterized in that, The tab through hole is rectangular, with a length of 5mm to 9mm and a width of 4mm to 5mm.

3. The novel anti-intervention bracket for the electrode tab as described in claim 1, characterized in that, The distance between the electrode through hole and the bottom of the frame is 4mm to 5mm.

4. The novel anti-intervention bracket for the electrode tab as described in claim 1, characterized in that, The tilt angle of the first inclined guide plate is 20° to 30°, and the tilt angle of the second inclined guide plate is 20° to 30°. The tilt angle of the first inclined guide plate is greater than the tilt angle of the second inclined guide plate.

5. The novel anti-intervention bracket for the electrode tab as described in claim 1, characterized in that, The thickness of the first inclined guide plate is 0.5mm to 1mm, and the length of the first inclined guide plate is 2mm to 3mm; The thickness of the second inclined guide plate is 0.5mm to 1mm, and the length of the second inclined guide plate is 2mm to 3mm.

6. The novel anti-intervention bracket for the electrode tab as described in claim 1, characterized in that, The length of the frame is 11mm to 15mm, and the width of the frame is 19mm to 22mm.

7. The novel anti-intervention bracket for the electrode tab as described in claim 1, characterized in that, The length of the restraint opening is 5mm to 9mm, and the width of the restraint opening is 2mm to 3mm.

8. The novel anti-intervention bracket for the electrode tab as described in claim 1, characterized in that, It also includes liquid inlet holes, which are located on both sides of the tab through hole, and the number of liquid inlet holes is 6 to 9.

9. The novel anti-intervention bracket for the electrode tab as described in claim 8, characterized in that, The liquid inlet is circular, and the diameter of the liquid inlet is 4mm to 6mm.

10. A battery pack comprising a battery module, said battery module comprising at least two battery cells, characterized in that, One end of the battery cell is provided with a stop frame as described in any one of claims 1-9 and a cover plate that engages with the stop frame. The stop frame is provided with an electrode tab, which passes through an electrode tab through hole. One end of the electrode tab is connected to an electrode inside the battery cell, and the other end of the electrode tab abuts against the cover plate to form a bent portion.

Images