Battery cell frame, battery cell frame processing process and battery

Abstract

The present application relates to the technical field of batteries, and particularly relates to a battery cell frame, a battery cell frame processing process and a battery. The battery cell frame is formed by means of bending a profile to form in the central region thereof an accommodating space where a battery cell is fixed, and the battery cell frame comprises a first frame and a second frame parallel to each other in a horizontal direction, and a third frame and a fourth frame parallel to each other in a vertical direction, wherein the first frame is higher than the second frame in the vertical direction; an explosion-proof valve hole, a liquid injection hole and electrode-post mounting holes are provided at intervals in the first frame, the second frame and the third frame of the battery cell frame; bent corners are formed at bent positions of the profile; the head and tail ends of the profile are welded and fixed together to form a weld joint; the distance between the weld joint and each of the explosion-proof valve hole, the liquid injection hole and the electrode-post mounting holes is greater than or equal to 2 mm; the distance between the weld joint of the profile and the closest bent corner is defined as A, the length of the weld joint located on the frame of the battery cell frame is defined as B, the radius of the bent corners is defined as R, and the parameters satisfy 1.2R≤A≤0.5B. The present application can reduce the production cost of the battery.

Description

Cell frame, cell frame processing technology and battery Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a cell frame, a cell frame processing technology, and a battery. Background Technology

[0002] In the prior art, the outer shell of a rigid-shell battery cell is generally composed of an aluminum shell and a cover plate (shell cover). The aluminum shell is mostly made by stamping. Specifically, an aluminum shell with a core groove is stamped on a raw material plate. After the core is placed in the core groove, the cover plate is placed on the aluminum shell, and finally the opening is welded to obtain a closed shell.

[0003] However, the stamping process is complex and the mold-making cost is high, which leads to high manufacturing costs for the battery cell casing.

[0004] Application content

[0005] The technical problem to be solved by this application is to provide a cell frame, a cell frame processing technology, and a battery, in response to existing problems.

[0006] To solve the above-mentioned technical problems, on the one hand, the embodiments of this application provide a battery cell frame, which is formed by bending a profile to create a space in the middle for accommodating the battery cell;

[0007] The cell frame includes a first and a second frame that are parallel to each other in the horizontal direction, and a third and a fourth frame that are parallel to each other in the vertical direction, wherein the first frame is higher than the second frame in the vertical direction.

[0008] The cell frame has explosion-proof valve holes, liquid injection holes, and electrode mounting holes spaced apart on the first frame, the second frame, and the third frame.

[0009] The profile bends to form a bending angle, and the two ends of the profile are welded to form a weld. The distance between the weld and the explosion-proof valve hole, the liquid injection hole and the pole mounting hole is ≥2mm.

[0010] The distance A from the weld joint of the profile to the nearest bending angle is A, the length B of the frame of the weld joint on the cell frame is B, and the radius R of the bending angle satisfies: 1.2R≤A≤0.5B.

[0011] Optionally, the distance A from the weld of the profile to the nearest bending angle is denoted by A, and the radius of the bending angle is R, satisfying: 1.2R≤A≤3R.

[0012] Optionally, the explosion-proof valve hole of the battery cell frame is a blind hole provided on the battery cell frame, and the blind hole is provided with a groove for explosion protection.

[0013] Optionally, the cell frame further includes an explosion-proof valve disposed on the explosion-proof valve hole. The explosion-proof valve hole includes a stepped hole disposed along the thickness direction of the cell frame. The explosion-proof valve includes an explosion-proof sheet and an explosion-proof membrane with grooves disposed on the stepped hole. There is a gap between the explosion-proof sheet and the explosion-proof membrane, and the gap is 0.3-1mm.

[0014] Optionally, the stepped hole includes a first through hole, a second through hole, and a third through hole extending sequentially, with the diameter of the first through hole gradually decreasing from the third through hole to the first through hole. The explosion-proof sheet is disposed at the second through hole, and the explosion-proof membrane is disposed at the first through hole.

[0015] Optionally, the ratio of the area of ​​the groove to the capacity of the battery is 0.5-3.5 mm. 2 / Ah.

[0016] Optionally, both the electrode mounting hole and the injection hole are located on the first frame.

[0017] Optionally, the electrode mounting hole is located on the third frame and / or the fourth frame; the injection hole is located on the third frame or the fourth frame, and is close to the side of the first frame.

[0018] Optionally, the cross-sectional area of ​​the pole mounting hole is 20 mm². 2 -60mm 2 .

[0019] According to the battery cell frame provided in this application embodiment, the profile is bent and the two ends of the profile are welded together to form a closed-loop battery cell frame. An accommodating space for placing the electrode core is formed inside the battery cell frame. Compared to the traditional method of stamping electrode core slots on the aluminum shell of the battery cell, the battery cell frame can accommodate the electrode core assembly without the use of stamping technology during production, reducing production costs. By setting the explosion-proof valve hole, liquid injection hole, and electrode mounting hole on the battery cell frame, the battery cell frame integrates the functions of the traditional aluminum shell and cover plate (shell cover) of the battery cell. Simultaneously, by limiting the distance between the weld and the explosion-proof valve hole, liquid injection hole, and electrode mounting hole, the functions of the explosion-proof valve hole, liquid injection hole, and electrode mounting hole are not damaged after welding. The limitation of the relationship between the distance of the profile weld joint to the nearest bending angle, the length of the weld joint on the cell frame, and the radius of the bending angle reduces the impact of welding stress on the bending angle and avoids deformation caused by welding heat; it ensures the strength of the weld joint and avoids welding defects caused by excessive distance; it allows the cell frame to have a certain adjustment space during processing and assembly to adapt to different production conditions and precision requirements; it improves the stability of the structure, reduces stress concentration caused by welding and bending, improves the durability of the structure, and ensures the stability of the first and last ends of the profile after welding.

[0020] On the other hand, this application provides a cell frame processing technology for processing the above-mentioned cell frame, including the following steps:

[0021] Prepare profiles with explosion-proof valves;

[0022] Machining electrode mounting holes and fluid injection holes;

[0023] Bending the profile;

[0024] The ends of the profile are welded together to obtain the battery cell frame.

[0025] Optionally, the preparation of the profile with the explosion-proof valve includes:

[0026] Drill blind holes in the sheet material.

[0027] Marks are made at the blind holes.

[0028] The sheet material is cut according to the preset length and width to obtain the profile.

[0029] Optionally, the preparation of the profile with the explosion-proof valve includes:

[0030] Three through holes—a first through hole, a second through hole, and a third through hole—are machined on the plate, with the diameter of the holes gradually decreasing along the thickness direction.

[0031] The punctured explosion-proof sheet is welded to the second through hole;

[0032] Apply the explosion-proof film to the first through hole.

[0033] Optionally, machining the electrode mounting hole and the injection hole includes:

[0034] The pole mounting holes and injection holes are machined together on the profile according to the preset positions by means of machining or stamping.

[0035] Optionally, in the step of welding the ends of the profile together, the welding is friction welding, laser welding, high-frequency welding, or resistance welding.

[0036] According to the battery cell frame processing technology provided in the embodiments of this application, a profile (long strip structure) is first processed. The processed profile has an explosion-proof valve. After processing the profile, electrode mounting holes and liquid injection holes are further processed on the profile with the explosion-proof valve. Then, the profile is bent into the required shape. The two ends of the profile are welded together to obtain the battery cell frame. This allows the battery cell frame to accommodate the electrode core assembly without the application of stamping technology during production, thus reducing production costs.

[0037] On the other hand, embodiments of this application provide a battery including the aforementioned cell frame, an electrode assembly disposed in the accommodating space of the cell frame, an electrode post assembly disposed on the cell frame and electrically connected to the electrode assembly, a sealing member, and two housings, wherein the two housings are respectively welded to both sides of the cell frame in the width direction to seal both sides of the accommodating space of the cell frame.

[0038] Optionally, the thickness of the cell frame is 0.8mm-3.5mm, and the thickness of the casing is 0.1mm-0.5mm.

[0039] According to the battery provided in this application embodiment, the electrode core assembly is installed in the accommodating space of the cell frame, and is installed in the corresponding electrode mounting hole through the electrode post assembly, so that the electrode post assembly is connected to the positive or negative electrode of the electrode core assembly. The electrolyte injection hole is sealed by installing a sealing member in it. The accommodating space of the cell frame is sealed on both sides by welding two housings to both sides of the width direction of the cell frame, preventing damage to the electrode core assembly in the accommodating space from the external environment. The cell frame is formed by bending, which makes it easier to control the dimensional accuracy of the connection compared to stamping the housing. Furthermore, the housing of this application does not require stamping or a dedicated stamping die, thus avoiding the situation where reduced dimensional accuracy is caused by reduced die precision. After the frame and the housing cover are connected, an accommodating space for installing the electrode core assembly is formed, resulting in a simpler structure and easier dimensional control. The embodiments of this application can simplify the housing processing technology, improve the dimensional accuracy of the housing, and reduce the production cost of the housing. Attached Figure Description

[0040] Figure 1 is a schematic diagram of the structure of a battery cell frame provided in an embodiment of this application;

[0041] Figure 2 is a schematic diagram of the structure of a battery cell frame provided in another embodiment of this application;

[0042] Figure 3 is a schematic diagram of the structure of the battery cell frame provided in another embodiment of this application;

[0043] Figure 4 is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0044] Figure 5 is an exploded view of a battery provided in an embodiment of this application;

[0045] Figure 6 is a schematic diagram of the internal structure of a battery provided in an embodiment of this application;

[0046] Figure 7 is an enlarged view of A in Figure 6;

[0047] Figure 8 is a force analysis diagram of a cell frame provided in an embodiment of this application.

[0048] The reference numerals in the accompanying drawings are as follows:

[0049] 100. Cell frame; 200. Electrode assembly; 300. Housing; A. Distance from the weld joint of the profile to the nearest bending angle; B. Length of the frame at the weld joint on the cell frame; R. Radius of the bending angle.

[0050] 1. Accommodation space; 2. First frame; 3. Second frame; 4. Third frame; 5. Fourth frame; 6. Explosion-proof valve hole; 7. Injection hole; 8. Pole mounting hole; 9. Bending angle; 10. Explosion-proof valve; 11. Sealing component; 12. Pole assembly; 13. Score; 14. Weld joint; 61. First through hole; 62. Second through hole; 63. Third through hole; 101. Explosion-proof sheet; 102. Explosion-proof membrane. Detailed Implementation

[0051] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0052] As shown in Figures 1 to 8, one embodiment of this application provides a battery cell frame 100, which is formed by bending a profile to create a space 1 in the middle for fixing the battery cell.

[0053] The cell frame 100 includes a first frame 2 and a second frame 3 that are parallel to each other in the horizontal direction, and a third frame 4 and a fourth frame 5 that are parallel to each other in the vertical direction. The first frame 2 is higher than the second frame 3 in the vertical direction.

[0054] The cell frame 100 is provided with explosion-proof valve holes 6, liquid injection holes 7, and electrode mounting holes 8 at intervals on the first frame 2, the second frame 3, and the third frame 4.

[0055] The profile bends to form a bending angle 9, and the two ends of the profile are welded to form a weld 14. The distance between the weld 14 and the explosion-proof valve hole 6, the liquid injection hole 7 and the pole mounting hole 8 is ≥2mm.

[0056] The distance A between the weld joint 14 and the nearest bending angle 9 of the profile is given by the following condition: the length B of the frame around the weld joint 14 on the cell frame is given by the following condition; and the radius R of the bending angle 9 is given by the following condition: 1.2R≤A≤0.5B. 1.2R≤A means that the minimum distance between the weld joint and the bending angle is at least 1.2 times the radius of the bending angle. This ensures sufficient space between the weld joint 14 and the bending angle 9, preventing welding stress from adversely affecting the bending angle. A≤0.5B means that the maximum distance between the weld joint 14 and the bending angle 9 does not exceed half the length of the frame. This helps maintain the stability of the weld 9 and reduces material usage. This relationship provides a certain range of design flexibility, allowing adjustments based on specific application requirements while meeting the minimum and maximum distance requirements. Maintaining an appropriate distance between the weld joint 14 and the bending angle 9 helps reduce the heat effect during welding, thereby reducing the risk of welding stress and deformation. In practical applications, designers need to determine the specific values ​​of A and R based on the specific material properties, welding methods, required structural strength and durability requirements, and manufacturing processes. Simultaneously, relevant industry standards and specifications must be followed to ensure that the final design meets functional requirements while also possessing good manufacturability and economic efficiency. In this embodiment, the overall structure of the battery cell frame 100 formed by bending the profile is square. The parallelism between the first frame 2 and the second frame 3 means that the side of the first frame 2 is parallel to the corresponding side of the second frame 3. For example, the side of the first frame 2 closest to the second frame 3 is parallel to the side of the second frame 3 closest to the first frame 2; the parallelism between the third frame 4 and the fourth frame 5 is similar. Two mutually spaced terminal mounting holes 8 are provided on the profile, namely the positive terminal mounting hole and the negative terminal mounting hole. The explosion-proof valve hole 6, the liquid injection hole 7, the positive terminal mounting hole, and the negative terminal mounting hole only need to be mutually spaced; they can be located simultaneously on the same profile frame or on different frames. By concentrating the explosion-proof valve hole 6, the liquid injection hole 7, the positive terminal mounting hole, and the negative terminal mounting hole on the frame, the battery cell frame 100 integrates the functions of the traditional battery cell's aluminum shell and cover plate (shell cover).Meanwhile, the length and width of different battery cell components may be different, and the length and width of different bent battery cell frames 100 are not exactly the same. The lengths of the four sides of different battery cell frames 100 are not exactly the same, and the lengths of the profiles corresponding to different battery cell frames 100 are not exactly the same. The positions of the explosion-proof valve hole 6, the liquid injection hole 7, and the two terminal mounting holes 8 on the corresponding profiles are not exactly the same. The distances from the weld joint 14 of the profile to the nearest bending angle 9, the distances from the end of the profile to the nearest bending angle 9, and the distances from the explosion-proof valve hole 6, the liquid injection hole 7, and the two terminal mounting holes 8 to the weld joint 14 are not exactly the same. However, the distances between the weld joint 14 of the battery cell frame 100 formed after bending and the explosion-proof valve hole 6, the liquid injection hole 7, and the terminal mounting holes 8 are all ≥2mm. This creates welding space for the weld joints 14 at both ends of the profile, ensuring that the explosion-proof valve hole 6, the liquid injection hole 7, the positive terminal mounting hole, and the negative terminal mounting hole are not damaged during welding. The distance A from the first end of the profile to the nearest bending angle 9 and the distance B from the last end of the profile to the nearest bending angle 9 are both ≥2mm, so that there is enough space between the weld 14 and the bending point of the battery cell frame 100, so that the weld 14 avoids the bending point, ensuring the stability of the weld between the first end and the last end of the profile, and so that the battery cell frame 100 after welding can stably fix the battery cell assembly in the accommodating space 1.

[0057] In one embodiment, the distance A between the weld joint 14 of the profile and the nearest bending angle 9, and the radius R of the bending angle 14, satisfying: 1.2R ≤ A ≤ 3R. The value of A / R is preferably 1.2-1.9. This ratio range provides some flexibility in design while ensuring welding quality and structural stability. In this embodiment, 1.2R is used as the minimum distance to ensure sufficient space between the weld joint 14 and the bending angle 9, reducing the impact of welding stress on the bending angle 9 and avoiding material fatigue or damage. A not exceeding 3R is used as the maximum distance to help control the overall dimensions of the profile. Simultaneously, structural stability and material economy are considered. An appropriate distance helps to evenly distribute welding stress, reducing stress concentration points, thereby improving the overall structural durability and reliability.

[0058] In one embodiment, the explosion-proof valve hole 6 of the cell frame 100 is a blind hole provided on the cell frame 100, and the blind hole is provided with explosion-proof markings 13. In this embodiment, the explosion-proof valve hole 6 can be open at one end facing the receiving space 1 and closed at the other end away from the receiving space 1, or it can be closed at one end facing the receiving space 1 and open at the other end away from the receiving space 1. By providing a blind hole and providing explosion-proof markings 13 on the blind hole, when the electrode core assembly 200 in the cell frame 100 abnormally generates gas, the gas can be quickly discharged to the outside of the cell frame 100 through the explosion-proof valve hole 6, ensuring the safety of the cell in use. The depth of the blind hole is 0.7-0.8 times the thickness of the profile. The thickness of the cell frame 100 is 0.8mm-3mm, which is thinner than the cover plate of a conventional cell. When the depth of the blind hole is 0.7-0.8 times the thickness of the profile, the thickness of the frame at the explosion-proof valve hole 6 is smaller. This allows the gas generated by the core assembly 200 of the cell to quickly break through the explosion-proof valve hole 6 and be discharged when the core assembly 200 of the cell in this application malfunctions.

[0059] In one embodiment, the cell frame 100 further includes an explosion-proof valve disposed on an explosion-proof valve hole 6. The explosion-proof valve hole 6 includes a stepped hole arranged along the thickness direction of the cell frame. The explosion-proof valve 10 includes an explosion-proof sheet 101 and an explosion-proof membrane 102 disposed on the stepped hole and having a notch 13. There is a gap between the explosion-proof sheet 101 and the explosion-proof membrane 102, with a gap of 0.3-1 mm. The stepped hole is arranged along the thickness direction of the cell frame. This design can provide stable support for the explosion-proof sheet 101 and the explosion-proof membrane 102, ensuring that they can work normally when the internal pressure of the cell increases. The explosion-proof sheet 101 has a notch 13, which can be designed as a weak point. When the internal pressure reaches a certain value, the notch 13 will rupture first, thereby releasing the pressure. The explosion-proof membrane 102 is usually a material with a certain degree of elasticity and strength, covering the stepped hole, and together with the explosion-proof sheet 101, constitutes the explosion-proof valve 10. The gap between the explosion-proof disc 101 and the explosion-proof membrane 102 is 0.3-1mm. This gap is crucial for the normal operation of the explosion-proof valve 10: if the gap is too small, the friction between the explosion-proof disc 101 and the explosion-proof membrane 102 may be too large, affecting the response speed of the explosion-proof valve 10; if the gap is too large, it may reduce the supporting force of the explosion-proof disc 101 and reduce the reliability of the explosion-proof valve 10. This design ensures that the battery cell can safely release pressure under abnormal conditions, avoiding damage to the surrounding environment or equipment. In this embodiment, there is a gap of 0.3-1mm between the top surface of the explosion-proof disc 101 and the explosion-proof membrane 102. If the depth of this gap is less than 0.3mm, the explosion-proof membrane 102 is likely to stick to the explosion-proof disc 101, increasing the detonation pressure of the explosion-proof disc 101, making it impossible for the explosion-proof disc 101 to meet the design requirements; if the depth of this gap is greater than 1mm, the explosion-proof disc 101 cannot be arranged in the thickness direction of the battery cell frame, or the structural strength of the step supporting the explosion-proof disc 101 cannot meet the requirements.

[0060] In one embodiment, the stepped hole includes a first through hole 61, a second through hole 62, and a third through hole 63 extending sequentially along the thickness direction of the cell frame 100. The diameters of the first through hole 61 to the third through hole 63 gradually decrease. A rupture-proof sheet is disposed at the second through hole 62, and a rupture-proof membrane is disposed at the first through hole 61. In this embodiment, the diameter gradually decreases from the first through hole 61 to the third through hole 63. This design can provide better mechanical support and may also help control the manner and speed of pressure release. The rupture-proof sheet 101 is disposed at the second through hole 62. This design allows the rupture-proof sheet 101 to rupture when the internal pressure increases to a certain level, releasing the pressure and preventing further expansion or rupture of the electrode core assembly 200. The rupture-proof membrane is disposed at the first through hole 61. The rupture-proof membrane 102 is typically a flexible material that can further release pressure after the rupture of the rupture-proof sheet 101 while maintaining the integrity of the cell. By setting stepped holes, a graded pressure release mechanism is provided, first through the explosion-proof sheet 101, and then through the explosion-proof membrane 102, to control the pressure release of the battery cell under abnormal conditions.

[0061] In one embodiment, the ratio of the area of ​​the notch 13 to the battery capacity is 0.5-3.5 mm. 2 / Ah. The ratio of the cross-sectional area of ​​the notch 13 to the capacity of the battery can be 0.5mm². 2 / Ah, 0.8mm 2 / Ah, 1.0mm 2 / Ah, 1.2mm 2 / Ah, 1.5mm 2 / Ah, 2.0mm 2 / Ah, 2.5mm 2 / Ah, 3.0mm 2 / Ah, 3.5mm 2 / Ah or a range of values ​​consisting of any two points. Preferably, the cross-sectional area of ​​the notch 13 of the explosion-proof sheet is 1.0-1.5 mm². 2 / Ah. Specifically, the cross-sectional area of ​​notch 13 is 20-400 mm². 2 Specifically, 25mm 2 35mm 2 45mm 2 55mm 2 65mm 2 76.8mm 2 80mm 2 102.4mm 2 110mm 2 120mm 2 125mm 2 130mm 2135mm 2 140mm 2 145mm 2 150mm 2 153.6mm 2 160mm 2 165mm 2 170mm 2 175mm 2 179.2mm 2 , 、 180mm 2 185mm 2 274mm 2 314mm 2 350mm 2 400mm 2 Or a range of values ​​formed by any two points. This allows for minimizing the area of ​​the explosion-proof notch 13 while effectively ensuring explosion protection, thus preventing damage to the notch 13 from the external environment. Battery capacity refers to the electrode core assembly located within the cell frame 100. This ratio is an important parameter in the design of the explosion-proof sheet, affecting the battery's ability to release pressure under abnormal conditions. The area of ​​the notch 13 determines the tendency of the explosion-proof sheet 101 to rupture under pressure. The larger the area of ​​the notch 13, the easier it is for the explosion-proof sheet 101 to rupture under lower internal pressure, thereby releasing pressure. This ratio provides a safety factor to ensure that the battery can safely release pressure under the maximum design pressure, preventing battery rupture or more serious safety accidents. Battery capacity (in ampere-hours, Ah) is a measure of the energy stored in the battery. The larger the capacity, the greater the pressure that may accumulate in the battery under abnormal conditions, thus requiring a larger notch 13 area to ensure safety. Design flexibility: The ratio range of 0.5-3.5 mm / Ah provides design flexibility, allowing the area of ​​the notch 13 to be adjusted according to the specific application and safety requirements of the battery.

[0062] In one embodiment, both the electrode mounting hole 8 and the liquid injection hole 7 are located on the first frame 2. In this embodiment, there are two electrode mounting holes 8, namely a positive electrode mounting hole and a negative electrode mounting hole. The explosion-proof valve hole 6, the liquid injection hole 7, the positive electrode mounting hole, and the negative electrode mounting hole are all connected to the receiving space 1. The positive electrode mounting hole is used to install the positive electrode assembly, and the electrode of the positive electrode assembly passes through the positive electrode mounting hole and is electrically connected to the positive electrode tab of the electrode core assembly 200. The negative electrode mounting hole is used to install the negative electrode assembly, and the electrode of the negative electrode assembly passes through the negative electrode mounting hole and is electrically connected to the negative electrode tab of the electrode core assembly 200.

[0063] In one embodiment, the electrode mounting hole 8 is located on the third frame 4 and / or the fourth frame 5; the electrolyte injection hole 7 is located on the third frame 4 or the fourth frame 5, and is close to the side of the first frame 2. The electrolyte injection hole 7 is used to inject electrolyte into the cell frame 100. When the cell frame 100 is normally placed, the second frame 3 is located at the bottom and the first frame 2 is located at the top. Setting the electrolyte injection hole 7 on the side of the third frame 4 or the fourth frame 5 close to the first frame 2 can facilitate the injection of electrolyte and prevent the electrolyte in the cell frame 100 from flowing out of the electrolyte injection hole 7.

[0064] In one embodiment, the cross-sectional area of ​​the pole mounting hole 8 is 20 mm². 2 -60mm 2 In this embodiment, the terminal mounting hole 8 is an elongated structure. The cross-sectional area of ​​the terminal mounting hole 8 refers to the area of ​​the terminal mounting hole 8 in the direction perpendicular to it, i.e., the cross-sectional area of ​​the terminal mounting hole 8. The terminal is a key component in the battery pack that connects to the external circuit. The cross-sectional area of ​​the terminal mounting hole 8 needs to be large enough to ensure the stability and durability of the terminal under mechanical stress. A larger cross-sectional area helps to improve heat dissipation performance because a larger area can provide more surface area to dissipate heat. The cross-sectional area of ​​the terminal mounting hole 8 is 20 mm². 2 30mm 2 40mm 2 20mm 2 50mm 2 The appropriate mounting hole area can be selected based on the different capacity and power requirements of the battery, making the size of the terminal mounting hole 8 more scientific and reasonable.

[0065] According to the battery cell frame 100 provided in this application embodiment, the profile is bent and the two ends of the profile are welded together to form a closed-loop battery cell frame 100. An accommodating space 1 for placing the electrode core is formed inside the battery cell frame 100. Compared to the traditional method of stamping electrode core slots on the aluminum shell of the battery cell to place the electrode core, the battery cell frame 100 can accommodate the electrode core assembly 200 without the application of stamping technology during production, reducing production costs. By setting the explosion-proof valve hole 6, the liquid injection hole 7, and the electrode mounting hole 8 on the battery cell frame 100, the battery cell frame 100 integrates the functions of the traditional aluminum shell and cover plate (shell cover) of the battery cell. Simultaneously, by limiting the distance between the weld 14 and the explosion-proof valve hole 6, the liquid injection hole 7, and the electrode mounting hole 8, the functions of the explosion-proof valve hole 6, the liquid injection hole 7, and the electrode mounting hole 8 are not damaged after welding. The limitation of the relationship between the distance of the weld joint 14 of the profile to the nearest bending angle 9 and the length of the frame of the weld joint 14 on the cell frame 100 and the radius of the bending angle 9 reduces the influence of welding stress on the bending angle and avoids deformation caused by welding heat; ensures the strength of the welded joint and avoids welding defects caused by excessive distance; allows the cell frame 100 to have a certain adjustment space during processing and assembly to adapt to different production conditions and precision requirements; improves the stability of the structure, reduces stress concentration caused by welding and bending, improves the durability of the structure, and ensures the stability of the first and last ends of the profile after welding.

[0066] In addition, one embodiment of this application provides a processing technology for a battery cell frame 100, used to process the battery cell frame 100 of the above embodiment, including the following steps:

[0067] Prepare profiles with explosion-proof valves;

[0068] Machining electrode mounting hole 8 and injection hole 7;

[0069] Bending profiles;

[0070] The ends of the profile are welded together to form the cell frame 100. In this embodiment, the profile is extruded, allowing the width of the profile to be any value as needed, providing greater flexibility in production. This also allows for greater flexibility in the width of the frame (thickness of the cell frame 100), enabling it to accommodate electrode core assemblies 200 of different thicknesses. Furthermore, extruding a long strip profile reduces the difficulty and production cost compared to extruding other frame-like structures. The length of the extruded profile can vary as needed, and can be greater than or equal to the circumference of multiple cell frames 100. Workers can cut the required length of the cell frame 100 from the profile as needed. Alternatively, the length of the extruded profile can be the circumference of a single cell frame 100, eliminating the need for cutting and allowing direct machining of the electrode mounting holes 8 and injection holes 7 on the profile.

[0071] In one embodiment, the preparation of a profile with an explosion-proof valve includes:

[0072] Drill blind holes in the sheet material.

[0073] Marks are made at the blind holes.

[0074] The sheet material is cut according to a preset length and width to obtain a profile. In this embodiment, the blind hole is an explosion-proof valve hole 6, and grooves are machined on the blind hole to form an explosion-proof valve. The sheet material here is the initial profile, and the desired profile is obtained after processing the initial profile.

[0075] In one embodiment, the preparation of a profile with an explosion-proof valve includes:

[0076] Three through holes—a first through hole, a second through hole, and a third through hole—are machined on the plate, with the diameter of the holes gradually decreasing along the thickness direction.

[0077] Weld the serrated explosion-proof sheet to the second through hole;

[0078] An explosion-proof film is affixed to the first through hole. In this embodiment, the interconnected first, second, and third through holes form an explosion-proof valve hole 6, which is a through hole used to install an explosion-proof sheet.

[0079] In one embodiment, machining the electrode mounting hole 8 and the liquid injection hole 7 includes:

[0080] The electrode mounting holes 8 and the electrolyte injection holes 7 are machined on the profile at predetermined positions using methods such as machining or stamping. In this embodiment, the profile is a long strip structure, and the cell frame 100 is a closed-loop square structure. Machining or stamping the electrode mounting holes 8 and the electrolyte injection holes 7 on the long strip profile before bending is simpler and less costly than machining the electrode mounting holes 8 and the electrolyte injection holes 7 on the annular cell frame 100.

[0081] In one embodiment, the welding of the two ends of the profile together is performed by friction welding, laser welding, high-frequency welding, or resistance welding. In this embodiment, after the profile is bent, the two opposite sides of the first end in the width direction are flush with the two opposite sides of the last end in the width direction. By using welding methods such as friction welding, laser welding, or high-frequency welding, the two ends of the profile can be stably welded together.

[0082] According to the processing technology of the battery cell frame 100 provided in the embodiments of this application, a profile (long strip structure) is first processed. The processed profile has an explosion-proof valve. After processing the profile, the electrode mounting hole 8 and the liquid injection hole 7 are further processed on the profile with the explosion-proof valve. Then, the profile is bent into the required shape and the two ends of the profile are welded together to obtain the battery cell frame 100. This allows the battery cell frame 100 to accommodate the electrode core assembly 200 without the application of stamping technology during production, thus reducing production costs.

[0083] Additionally, as shown in Figures 1 and 2, one embodiment of this application provides a battery, including the cell frame 100 of the above embodiment, the electrode core assembly 200 disposed in the receiving space 1 of the cell frame 100, the electrode post assembly 12 and the sealing member 11 disposed on the cell frame 100 and electrically connected to the electrode core assembly 200, and two housings 300. The two housings 300 are respectively welded to both sides of the cell frame 100 in the width direction to seal both sides of the receiving space 1 of the cell frame 100. There are two terminal mounting holes 8 and two terminal assembly 12. The two terminal assemblies are a positive terminal assembly and a negative terminal assembly, respectively. The two terminal mounting holes 8 are a positive terminal mounting hole and a negative terminal mounting hole, respectively. The positive terminal assembly is installed in the positive terminal mounting hole, and the negative terminal assembly is installed in the negative terminal mounting hole. The two housings 300 are welded to both sides of the cell frame 100 in the width direction, respectively, to seal both sides of the housing space 1 of the cell frame 100, thereby preventing damage to the terminal assembly 200 in the housing space 1 from the external environment. The battery in this embodiment does not require a stamping process, which can reduce costs. The terminal assembly 200, the cell frame 100, the two housings 300, the two terminal assemblies 12, and the sealing member 11 constitute a single cell. The battery can be composed of a single cell or multiple cells.

[0084] In one embodiment, the thickness of the cell frame 100 is 0.8mm-3.5mm, and the thickness of the housing 300 is 0.1mm-0.5mm. In this embodiment, the thickness of the cell frame 100 can be 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0mm, etc., and the thickness of the cell frame 100 can vary according to the thickness of the electrode core. The thickness of the housing 300 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.30mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, etc. Compared to the casing 300, the cell frame 100 is thicker, which helps provide sufficient mechanical strength to protect the cell from external impacts and pressure. While the casing 300 is thinner, its main function is to encapsulate the cell and provide basic physical protection, while also maintaining a lightweight design. The thinner casing helps reduce the overall weight of the battery, and the thickness of the cell frame 100 can be adjusted within a certain range as needed to balance weight and strength. Simultaneously, the thickness of the cell frame 100 affects its heat dissipation capacity; a thicker cell frame 100 provides better thermal conductivity. This application comprehensively considers the above factors when designing the cell frame 100 and casing 300 of the battery to ensure that the battery provides the required energy while also possessing sufficient safety, reliability, and performance. Furthermore, the casing 300 in this embodiment does not require a stamping process, and its thickness is thinner than that of a conventional battery casing 300, saving processing costs.

[0085] According to the battery provided in this application embodiment, the electrode core assembly 200 is installed in the accommodating space of the cell frame 100. Two electrode post assemblies 12 are installed in corresponding electrode post mounting holes 8, making the two electrode post assemblies 12 conductive to the positive or negative electrode of the electrode core assembly 200. A sealing member 11 is installed in the liquid injection hole 7 to seal the liquid injection hole 7. Two housings 300 are welded to both sides of the cell frame 100 in the width direction to seal both sides of the accommodating space 1 of the cell frame 100, preventing damage to the electrode core assembly 200 in the accommodating space 1 from the external environment. The cell frame 100 is formed by bending, which makes it easier to control the dimensional accuracy of the connection compared to stamping the housing 300. Furthermore, the housing 300 of this application does not require stamping or a dedicated stamping die, thus avoiding the situation where reduced dimensional accuracy is caused by reduced die precision. After the frame and the housing cover are connected, an accommodating space for installing the electrode core assembly is formed, resulting in a simpler structure and easier dimensional control. The embodiments of this application can simplify the processing technology of the casing, improve the dimensional accuracy of the casing, and reduce the production cost of the casing. At the same time, neither the cell frame 100 nor the casing 300 of this application uses stamping technology during production, which can reduce the production cost of the battery.

[0086] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell frame, characterized in that, The battery cell frame is formed by bending profiles to create a space in the middle for fixing the battery cells; The cell frame includes a first and a second frame that are parallel to each other in the horizontal direction, and a third and a fourth frame that are parallel to each other in the vertical direction, wherein the first frame is higher than the second frame in the vertical direction. The cell frame has explosion-proof valve holes, liquid injection holes, and electrode mounting holes spaced apart on the first frame, the second frame, and the third frame. The profile bends to form a bending angle, and the two ends of the profile are welded to form a weld. The distance between the weld and the explosion-proof valve hole, the liquid injection hole and the pole mounting hole is ≥2mm. The distance A from the weld joint of the profile to the nearest bending angle is A, the length B of the frame of the weld joint on the cell frame is B, and the radius R of the bending angle satisfies: 1.2R≤A≤0.5B.

2. The cell frame according to claim 1, characterized in that, The distance A from the weld of the profile to the nearest bending angle is given by A, and the radius of the bending angle is given by R, satisfying: 1.2R≤A≤3R.

3. The cell frame according to claim 1, characterized in that, The explosion-proof valve hole of the battery cell frame is a blind hole provided on the battery cell frame, and the blind hole is provided with a groove for explosion protection.

4. The cell frame according to claim 1, characterized in that, The battery cell frame also includes an explosion-proof valve disposed on the explosion-proof valve hole. The explosion-proof valve hole includes a stepped hole disposed along the thickness direction of the battery cell frame. The explosion-proof valve includes an explosion-proof sheet and an explosion-proof membrane disposed on the stepped hole with grooves. There is a gap between the explosion-proof sheet and the explosion-proof membrane, and the gap is 0.3-1mm.

5. The cell frame according to claim 4, characterized in that, The stepped hole includes a first through hole, a second through hole, and a third through hole that extend sequentially. The diameter of the holes from the first through hole to the third through hole gradually decreases. The explosion-proof sheet is disposed at the second through hole, and the explosion-proof membrane is disposed at the first through hole.

6. The cell frame according to claim 3 or 4, characterized in that, The ratio of the area of ​​the groove to the capacity of the battery is 0.5-3.5 mm. 2 / Ah.

7. The cell frame according to claim 1, characterized in that, Both the electrode mounting hole and the injection hole are located on the first frame.

8. The cell frame according to claim 1, characterized in that, The electrode mounting hole is located on the third frame and / or the fourth frame; the injection hole is located on the third frame or the fourth frame, and is close to the side of the first frame.

9. A cell frame processing technology for processing the cell frame as described in any one of claims 1-8, characterized in that, Includes the following steps: Prepare profiles with explosion-proof valves; Machining electrode mounting holes and fluid injection holes; Bending the profile; The ends of the profile are welded together to obtain the battery cell frame.

10. The cell frame processing technology according to claim 9, characterized in that, The preparation of the profile with the explosion-proof valve includes: Drill blind holes in the sheet material. Marks are made at the blind holes. The sheet material is cut according to the preset length and width to obtain the profile.

11. The cell frame processing technology according to claim 9, characterized in that, The preparation of the profile with the explosion-proof valve includes: Three through holes—a first through hole, a second through hole, and a third through hole—are machined on the plate, with the diameter of the holes gradually decreasing along the thickness direction. The punctured explosion-proof sheet is welded to the second through hole; Apply the explosion-proof film to the first through hole.

12. The cell frame processing technology according to claim 9, characterized in that, Machining the electrode mounting holes and injection holes includes: The pole mounting holes and injection holes are machined together on the profile according to the preset positions by means of machining or stamping.

13. The cell frame processing technology according to claim 9, characterized in that, In the step of welding the ends of the profile together, the welding is friction welding, laser welding, high-frequency welding, or resistance welding.

14. A battery, characterized in that, The battery includes a cell frame as described in any one of claims 1 to 8, an electrode assembly disposed in the receiving space of the cell frame, an electrode post assembly disposed on the cell frame and electrically connected to the electrode assembly, a sealing member, and two housings, wherein the two housings are respectively welded to both sides of the cell frame in the width direction to seal both sides of the receiving space of the cell frame.

15. The cell frame processing technology according to claim 11, characterized in that, The thickness of the battery cell frame is 0.8mm-3.5mm, and the thickness of the casing is 0.1mm-0.5mm.

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