Battery cell frame and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell frame and a battery. The battery cell frame is formed by bending a profile to form an accommodating space for fixing a battery cell in the middle; the battery cell frame comprises a first frame and a second frame which are parallel to each other in the horizontal direction and a third frame and a fourth frame which are parallel to each other in the vertical direction, and the first frame is higher than the second frame in the vertical direction; anti-explosion valve holes, liquid injection holes and pole mounting holes are formed in the first frame, the second frame and the third frame of the battery cell frame at intervals, a bending angle is formed at the bending part of a profile, the head end and the tail end of the profile are welded and fixed to form welding parts, and the distances between the welding parts and the anti-explosion valve holes, the liquid injection holes and the pole mounting holes are all larger than or equal to 2 mm; the distance between the welding position of the section bar and the nearest bending angle is A, the frame length of the welding position on the cell frame is B, the radius of the bending angle is R, and 1.2 R < = A < = 0.5 B. The production cost of the battery can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a battery cell frame and a battery. Background Art

[0002] In the prior art, the outer shell of a battery cell with a hard shell structure is generally composed of an aluminum shell and a cover plate (shell cover). Among them, most of the aluminum shells are manufactured by stamping. Specifically, an aluminum shell with a pole core groove is stamped on a raw material plate. After the pole core is placed in the pole core groove, the cover plate is sealed on the aluminum shell, and finally welded and sealed to obtain a closed outer shell.

[0003] However, the stamping manufacturing and mold opening process is complex, and the mold opening cost is high, resulting in a high manufacturing cost of the outer shell of the battery cell. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: in view of the existing problems, to provide a battery cell frame and a battery.

[0005] To solve the above technical problem, on the one hand, an embodiment of the utility model provides a battery cell frame, which is formed by bending a profile and has a receiving space for fixing a battery cell in the middle;

[0006] The battery cell frame includes a first side frame and a second side frame that are parallel to each other in the horizontal direction, and a third side frame and a fourth side frame that are parallel to each other in the vertical direction. The first side frame is higher than the second side frame in the vertical direction;

[0007] The battery cell frame is provided with explosion-proof valve holes, liquid injection holes and pole post mounting holes at intervals on the first side frame, the second side frame and the third side frame;

[0008] A bending angle is formed at the bending place of the profile, and the head and tail ends of the profile are welded and fixed to form a welding place. The distances from the welding place to the explosion-proof valve hole, the liquid injection hole and the pole post mounting hole are all ≥2mm;

[0009] The distance from the welding place of the profile to the nearest bending angle is A, the length of the upper side frame of the battery cell frame where the welding place is located is B, and the radius of the bending angle is R, satisfying: 1.2R≤A≤0.5B.

[0010] Optionally, the distance from the welding place of the profile to the nearest bending angle is A, and the radius of the bending angle is R, satisfying: 1.2R≤A≤3R.

[0011] Optionally, the explosion-proof valve hole of the battery cell frame is a blind hole provided on the battery cell frame, and a notch for explosion protection is provided on the blind hole.

[0012] 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 film with a notch disposed on the stepped hole. There is a gap between the explosion-proof sheet and the explosion-proof film, and the gap is 0.3 - 1 mm.

[0013] Optionally, the stepped hole includes a first through hole, a second through hole, and a third through hole extending in sequence. The aperture diameters of the first through hole to the third through hole gradually decrease. The explosion-proof sheet is disposed at the second through hole, and the explosion-proof film is disposed at the first through hole.

[0014] Optionally, the ratio of the area of the notch to the capacity of the battery is 0.5 - 3.5 mm 2 / Ah.

[0015] Optionally, both the pole post mounting hole and the liquid injection hole are located on the first side frame.

[0016] Optionally, the pole post mounting hole is located on the third side frame and / or the fourth side frame; the liquid injection hole is located on the third side frame or the fourth side frame and on the side close to the first side frame.

[0017] Optionally, the cross-sectional area of the pole post mounting hole is 20 mm 2 -60 mm 2 .

[0018] According to the cell frame provided by the embodiments of the present invention, the profile is bent and the two ends of the profile are welded together to form a closed-loop cell frame, and a receiving space for placing the electrode core is formed inside the cell frame. Compared with the traditional method of stamping a pole core groove for placing the electrode core on the aluminum shell of the cell, the cell frame can accommodate the electrode core assembly without using stamping technology during production, reducing the production cost. By disposing the explosion-proof valve hole, the liquid injection hole, and the pole post mounting hole on the cell frame, the cell frame integrates the functions of the traditional aluminum shell and cover plate (shell cover) of the cell. At the same time, by limiting the distances between the welding joint and the explosion-proof valve hole, the liquid injection hole, and the pole post mounting hole, the functions of the explosion-proof valve hole, the liquid injection hole, and the pole post mounting hole are not damaged after welding. By limiting the relationship between the distance from the welding joint of the profile to the nearest bending angle, the length of the side frame on which the welding joint is located on the cell frame, and the radius distance of the bending angle, the influence of the welding stress on the bending angle is reduced, avoiding deformation caused by the welding heat effect; ensuring the strength of the welding joint, avoiding welding defects caused by too close a distance; enabling the cell frame to have a certain adjustment space during processing and assembly to adapt to different production conditions and precision requirements; improving the structural stability, reducing stress concentration caused by welding and bending, improving the structural durability, and ensuring the stability of the head and tail ends of the profile after welding.

[0019] On the other hand, an embodiment of the present utility model provides a processing technology for a battery cell frame for processing the above-mentioned battery cell frame, including the following steps:

[0020] Prepare a profile with an explosion-proof valve;

[0021] Machine the pole post mounting holes and liquid injection holes;

[0022] Bend the profile;

[0023] Weld the ends of the head and tail of the profile to obtain a battery cell frame.

[0024] Optionally, the preparation of the profile with an explosion-proof valve includes:

[0025] Machine blind holes in the plate,

[0026] Machine a notch at the blind hole,

[0027] Cut the plate according to a preset length and width to obtain a profile.

[0028] Optionally, the preparation of the profile with an explosion-proof valve includes:

[0029] Machine three first through holes, second through holes and third through holes with gradually decreasing hole diameters along the thickness direction on the plate;

[0030] Weld an explosion-proof sheet with a notch to the second through hole;

[0031] Lay an explosion-proof film on the first through hole.

[0032] Optionally, machining the pole post mounting holes and liquid injection holes includes:

[0033] Machine the pole post mounting holes and liquid injection holes on the profile at a preset position by machining or stamping.

[0034] Optionally, in the step of welding the ends of the head and tail of the profile together, the welding is friction welding or laser welding, high-frequency welding, resistance welding.

[0035] According to the processing technology of the battery cell frame provided by the embodiment of the present utility model, first process a profile (long strip structure), the processed profile has an explosion-proof valve. After processing the profile, further process the pole post mounting holes and liquid injection holes on the profile with an explosion-proof valve. Then bend the profile. After bending the profile into the required shape, weld the two ends of the profile together to obtain a battery cell frame, so that the battery cell frame can accommodate the pole core assembly without applying stamping technology during production, reducing the production cost.

[0036] On the other hand, an embodiment of the present utility model provides a battery, which includes the above-mentioned battery cell frame, a pole core assembly disposed in the accommodation space of the battery cell frame, a pole column assembly and a plugging member disposed on the battery cell frame and electrically connected to the pole core assembly, and two housings. The two housings are respectively welded to both sides in the width direction of the battery cell frame to seal both sides of the accommodation space of the battery cell frame.

[0037] Optionally, the thickness of the battery cell frame is 0.8 mm - 3.5 mm, and the thickness of the housing is 0.1 mm - 0.5 mm.

[0038] According to the battery provided by the embodiment of the present utility model, the pole core assembly is installed in the accommodation space of the battery cell frame and is installed in the corresponding pole column installation hole through the pole column assembly, so that the pole column assembly is electrically connected to the positive or negative electrode of the pole core assembly. By installing the plugging member in the liquid injection hole, the sealing of the liquid injection hole is completed. By welding the two housings to both sides in the width direction of the battery cell frame respectively, the sealing of both sides of the accommodation space of the battery cell frame is completed, avoiding damage to the pole core assembly in the accommodation space caused by the external environment. By bending to form the battery cell frame, compared with stamping the housing, it is easier to control the dimensional accuracy of the connection. And the housing of the present application does not need to be stamped, nor does it require a special stamping die, so the situation of dimensional accuracy reduction caused by the reduction of die accuracy will not occur. After the frame body and the shell cover are connected, a corresponding accommodation space for installing the pole core assembly can be formed, and the structure is simpler and the size is easier to control. The embodiment of the present application can simplify the processing technology of the housing, improve the dimensional processing accuracy of the housing, and reduce the production cost of the housing. Description of the Drawings

[0039] Figure 1 is a schematic structural diagram of a battery cell frame provided by an embodiment of the present utility model;

[0040] Figure 2 is a schematic structural diagram of a battery cell frame provided by another embodiment of the present utility model;

[0041] Figure 3 is a schematic structural diagram of a battery cell frame provided by another embodiment of the present utility model;

[0042] Figure 4 is a schematic structural diagram of a battery provided by an embodiment of the present utility model;

[0043] Figure 5 is an exploded view of a battery provided by an embodiment of the present utility model;

[0044] Figure 6 is a schematic internal structure diagram of a battery provided by an embodiment of the present utility model;

[0045] Figure 7 isFigure 6 Enlarged view of A;

[0046] Figure 8 It is the force analysis diagram of the battery cell frame provided by an embodiment of the present utility model.

[0047] The reference numerals in the specification are as follows:

[0048] 100, battery cell frame; 200, electrode core assembly; 300, housing; A, distance from the welding joint of the profile to the nearest bending angle; B, length of the side frame where the welding joint is located on the battery cell frame; R, radius of the bending angle

[0049] 1, accommodation space; 2, first side frame; 3, second side frame; 4, third side frame; 5, fourth side frame; 6, explosion-proof valve hole; 7, liquid injection hole; 8, pole column mounting hole; 9, bending angle; 10, explosion-proof valve; 11, plugging member; 12, pole column assembly; 13, notch; 14, welding joint; 61, first through hole; 62, second through hole; 63, third through hole; 101, explosion-proof sheet; 102, explosion-proof film. Detailed implementation manners

[0050] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0051] As Figures 1 to 8 shown, an embodiment of the present utility model provides a battery cell frame 100, which is formed by bending a profile and has an accommodation space 1 for fixing a battery cell in the middle;

[0052] The battery cell frame 100 includes a first side frame 2 and a second side frame 3 that are parallel to each other in the horizontal direction and a third side frame 4 and a fourth side frame 5 that are parallel to each other in the vertical direction. The first side frame 2 is higher than the second side frame 3 in the vertical direction;

[0053] The battery cell frame 100 is provided with explosion-proof valve holes 6, liquid injection holes 7 and pole column mounting holes 8 at intervals on the first side frame 2, the second side frame 3 and the third side frame 4,

[0054] The bending part of the profile forms a bending angle 9, and the head and tail ends of the profile are welded and fixed to form a welding joint 14. The distances between the welding joint 14 and the explosion-proof valve holes 6, the liquid injection holes 7 and the pole column mounting holes 8 are all ≥ 2 mm;

[0055] The distance between the welding joint 14 of the profile and the nearest bending angle 9 is A, the length of the border of the welding joint 14 on the cell frame is B, and the radius of the bending angle 9 is R, satisfying: 1.2R ≤ A ≤ 0.5B. 1.2R ≤ A means that the minimum distance between the welding joint and the bending angle is at least 1.2 times the radius of the bending angle. This can ensure that there is enough space between the welding joint 14 and the bending angle 9 to avoid adverse effects of welding stress on the bending angle. A ≤ 0.5B means that the maximum distance between the welding joint 14 and the bending angle 9 does not exceed half of the border length, which helps to maintain the stability of the welding 9 and at the same time helps to reduce the use of materials. This relationship provides a certain range of design flexibility, allowing adjustment according to specific application requirements while meeting the minimum and maximum distance requirements. Maintaining an appropriate distance between the welding joint 14 and the bending angle 9 helps to reduce the thermal influence generated during the welding process, thereby reducing the risk of welding stress and deformation. In practical applications, designers need to determine the specific values of A and R according to specific material properties, welding methods, required structural strength and durability requirements, and manufacturing processes. At the same time, relevant industry standards and specifications also need to be followed to ensure that the final design not only meets the functional requirements but also has good processability and economy. In this embodiment, by bending the profile, the overall structure of the formed cell frame 100 is square. Among them, the parallelism between the first border 2 and the second border 3 means that the side surface of the first border 2 is parallel to the corresponding side surface of the second border 3. For example, the side surface of the first border 2 close to the second border 3 is parallel to the side surface of the second border 3 close to the first border 2; the parallelism between the third border 4 and the fourth border 5 is similar. There are two mutually spaced pole mounting holes 8 on the profile, which are the positive pole mounting hole and the negative pole mounting hole respectively. The explosion-proof valve hole 6, the liquid injection hole 7, the positive pole mounting hole and the negative pole mounting hole only need to be mutually spaced. They can be located on the border of the same profile at the same time, or on different borders respectively. Concentrating the explosion-proof valve hole 6, the liquid injection hole 7, the positive pole mounting hole and the negative pole mounting hole on the border enables the cell frame 100 to integrate the functions of the aluminum shell and the cover plate (shell cover) of the traditional cell.Meanwhile, the lengths and widths of different battery cell components may vary, and the lengths and widths of the different battery cell frames 100 formed by bending are not exactly the same. The lengths of the four side frames of the different battery cell frames 100 are not exactly the same, the lengths of the profiles corresponding to the different battery cell frames 100 are not exactly the same, and the positions of the explosion-proof valve holes 6, liquid injection holes 7, and two pole column mounting holes 8 on the corresponding profiles are not exactly the same. The distance from the welding joint 14 of the profile to the nearest bending angle 9, the distance from the end of the profile to the nearest bending angle 9, and the distances from the explosion-proof valve hole 6, liquid injection hole 7, and two pole column mounting holes 8 to the welding joint 14 are not exactly the same. However, the distances from the welding joint 14 of the battery cell frame 100 formed after bending to the explosion-proof valve hole 6, liquid injection hole 7, and pole column mounting hole are all ≥ 2 mm. This creates a welding space for the welding joints 14 at both ends of the profile, ensuring that the explosion-proof valve hole 6, liquid injection hole 7, positive pole column mounting hole, and negative pole column mounting hole are not damaged during welding. The distance A from the head end of the profile to the nearest bending angle 9 and the distance B from the end of the profile to the nearest bending angle 9 are both ≥ 2 mm, providing sufficient space between the welding joint 14 and the bending part of the battery cell frame 100, enabling the welding joint 14 to avoid the bending part, ensuring the stability of welding the head end and the end of the profile, and enabling the welded battery cell frame 100 to stably fix the battery cell component in the accommodation space 1.

[0056] In one embodiment, the distance from the welding joint 14 of the profile to the nearest bending angle 9 is A, and the radius of the bending angle 14 is R, satisfying: 1.2R ≤ A ≤ 3R. The value of A / R is preferably 1.2 - 1.9. This ratio range provides a certain degree of flexibility in the design and also ensures the welding quality and structural stability. In this embodiment, 1.2R is used as the minimum distance to ensure sufficient space between the welding joint 14 and the bending angle 9, reducing the influence of welding stress on the bending angle 9 and avoiding material fatigue or damage; A not exceeding 3R is used as the maximum distance, which helps to control the overall size of the profile. Considering the structural stability and material economy, an appropriate distance helps to evenly distribute the welding stress and reduce stress concentration points, thereby improving the durability and reliability of the overall structure.

[0057] In one embodiment, the explosion-proof valve hole 6 of the battery cell frame 100 is a blind hole provided on the battery cell frame 100, and a notch 13 for explosion-proof is provided on the blind hole. In this embodiment, the explosion-proof valve hole 6 may be open at one end facing the accommodation space 1 and closed at the other end facing away from the accommodation space 1, or may be closed at one end facing the accommodation space 1 and open at the other end facing away from the accommodation space 1. By providing a blind hole and a notch 13 for explosion-proof on the blind hole, when abnormal gas is generated in the electrode core assembly 200 in the battery cell frame 100, the gas can be quickly discharged to the outside of the battery cell frame 100 through the explosion-proof valve hole 6, ensuring the safe use of the battery cell. The depth of the blind hole is 0.7-0.8 times the thickness of the profile. Among them, the thickness of the battery cell frame 100 is 0.8 mm-3 mm, which is thinner than the cover plate of a conventional battery 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, so that when the electrode core assembly 200 in the battery cell of the present application has an abnormality, the gas generated by the electrode core assembly 200 can quickly break through the explosion-proof valve hole 6 and discharge out.

[0058] In one embodiment, the battery cell frame 100 further includes an explosion-proof valve provided on the explosion-proof valve hole 6. The explosion-proof valve hole 6 includes a stepped hole provided along the thickness direction of the battery cell frame. The explosion-proof valve 10 includes an explosion-proof sheet 101 and an explosion-proof film 102 provided on the stepped hole and having a notch 13. There is a gap between the explosion-proof sheet 101 and the explosion-proof film 102, and the gap is 0.3-1 mm. The stepped hole is provided along the thickness direction of the battery cell frame. This design can provide stable support for the explosion-proof sheet 101 and the explosion-proof film 102, ensuring that they can work properly when the internal pressure of the battery 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 film 102 is usually a material with a certain elasticity and strength, covering the stepped hole and jointly forming the explosion-proof valve 10 with the explosion-proof sheet 101. The gap between the explosion-proof sheet 101 and the explosion-proof film 102 is 0.3-1 mm. 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 sheet 101 and the explosion-proof film 102 may be too large, affecting the response speed of the explosion-proof valve 10; if the gap is too large, the supporting force of the explosion-proof sheet 101 may be reduced, reducing the reliability of the explosion-proof valve 10. This design ensures that the battery cell can safely release pressure in case of an abnormality, avoiding damage to the surrounding environment or equipment. In this embodiment, there is a gap with a depth of 0.3-1 mm between the top surface of the explosion-proof sheet 101 and the explosion-proof film 102. If the depth of this gap is less than 0.3 mm, the explosion-proof film 102 is likely to stick to the explosion-proof sheet 101, increasing the detonation pressure of the explosion-proof sheet 101, making the explosion-proof sheet 101 unable to meet the design requirements; if the depth of this gap is greater than 1 mm, the explosion-proof sheet 101 cannot be arranged in the thickness direction of the battery cell frame, or the structural strength of the step supporting the explosion-proof sheet 101 cannot meet the requirements.

[0059] In one embodiment, the stepped hole includes a first through hole 61, a second through hole 62, and a third through hole 63 that extend sequentially along the thickness direction of the battery cell frame 100. The diameters of the first through hole 61 to the third through hole 63 gradually decrease. The explosion-proof sheet is disposed at the second through hole 62, and the explosion-proof film is disposed at the first through hole 61. In this embodiment, from the first through hole 61 to the third through hole 63, the diameter gradually decreases. This design can provide better mechanical support and may also help control the way and speed of pressure release. The explosion-proof sheet 101 is disposed at the second through hole 62. This design allows the explosion-proof sheet 101 to rupture when the internal pressure increases to a certain extent, releasing the pressure and preventing the electrode core assembly 200 from further expanding or rupturing. The explosion-proof film is disposed at the first through hole 61. The explosion-proof film 102 is usually a flexible material that can further release the pressure after the explosion-proof sheet 101 ruptures while maintaining the integrity of the battery cell. By providing the stepped hole, a hierarchical pressure release mechanism is provided, first through the explosion-proof sheet 101 and then through the explosion-proof film 102, to control the pressure release of the battery cell under abnormal conditions.

[0060] In one embodiment, the ratio of the area of the notch 13 to the capacity of the battery 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 0.5 mm 2 / Ah, 0.8 mm 2 / Ah, 1.0 mm 2 / Ah, 1.2 mm 2 / Ah, 1.5 mm 2 / Ah, 2.0 mm 2 / Ah, 2.5 mm 2 / Ah, 3.0 mm 2 / Ah, 3.5 mm 2 / Ah or a range value composed of any two point values. Preferably, the cross-sectional area of the notch 13 of the explosion-proof sheet is 1.0 - 1.5 mm 2 / Ah. Specifically, the cross-sectional area of the notch 13 is 20 - 400 mm 2 , specifically 25 mm 2 , 35 mm 2 , 45 mm 2 , 55 mm 2 , 65 mm 2 , 76.8 mm 2 , 80 mm 2 , 102.4 mm 2 , 110 mm 2 , 120 mm 2 , 125 mm 2 , 130 mm 2 , 135 mm2 、140 mm 2 、145 mm 2 、150 mm 2 、153.6 mm 2 、160 mm 2 、165 mm 2 、170 mm 2 、175 mm 2 、179.2 mm 2 、 、 180 mm 2 、185 mm 2 、274 mm 2 、314 mm 2 、350 mm 2 、400 mm 2 or a range value composed of any two point values. In this way, on the premise of effectively ensuring explosion protection, the area of the explosion-proof notch 13 can be minimized as much as possible to avoid damage to the explosion-proof notch 13 by the external environment. The battery capacity refers to the electrode core assembly located within the battery core frame 100. This ratio is an important parameter in the design of the explosion-proof sheet, and it affects the ability of the battery to release pressure under abnormal conditions. The area of the notch 13 determines the rupture tendency of the explosion-proof sheet 101 under the action of pressure. The larger the area of the notch 13, the easier it is for the explosion-proof sheet 101 to rupture at a lower internal pressure, thereby releasing pressure. This ratio provides a safety factor to ensure that the battery can safely release pressure under the designed maximum pressure, preventing the battery from rupturing or causing more serious safety accidents. The capacity of the battery (in ampere-hours, Ah) is a measure of the energy stored in the battery. The larger the capacity, the greater the pressure that the battery may accumulate under abnormal conditions, so a larger area of the notch 13 is required to ensure safety. Design flexibility: The ratio range of 0.5 - 3.5 mm² / 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.

[0061] In one embodiment, both the pole post mounting hole 8 and the liquid injection hole 7 are located on the first frame 2. In this implementation, the number of pole post mounting holes 8 is two. The two pole post mounting holes 8 are respectively the positive pole post mounting hole and the negative pole post mounting hole. The explosion-proof valve hole 6, the liquid injection hole 7, the positive pole post mounting hole, and the negative pole post mounting hole are all connected to the accommodation space 1. The positive pole post mounting hole is used to mount the positive pole post assembly, and the pole post of the positive pole post assembly passes through the positive pole post mounting hole and is electrically connected to the positive pole tab of the electrode core assembly 200; the negative pole post mounting hole is used to mount the negative pole post assembly, and the pole post of the negative pole post assembly passes through the negative pole post mounting hole and is electrically connected to the negative pole tab of the electrode core assembly 200.

[0062] In one embodiment, the pole mounting hole 8 is located on the third side frame 4 and / or the fourth side frame 5; the liquid injection hole 7 is located on the third side frame 4 or the fourth side frame 5 and on the side close to the first side frame 2. The liquid injection hole 7 is used to inject electrolyte into the battery cell frame 100. When the battery cell frame 100 is placed normally, the second side frame 3 is at the bottom and the first side frame 2 is at the top. Setting the liquid injection hole 7 on the side of the third side frame 4 or the fourth side frame 5 close to the first side frame 2 facilitates the injection of electrolyte and can prevent the electrolyte in the battery cell frame 100 from flowing out of the liquid injection hole 7.

[0063] In one embodiment, the cross-sectional area of the pole mounting hole 8 is 20 mm 2 -60 mm 2 . In this embodiment, the pole mounting hole 8 is of a long strip structure. The cross-sectional area of the pole mounting hole 8 refers to the area of the pole mounting hole 8 in the direction perpendicular to the pole mounting hole 8, that is, the cross-sectional area of the pole mounting hole 8. The pole is a key component connecting the external circuit in the battery pack. The cross-sectional area of the pole mounting hole 8 needs to be large enough to ensure the stability and durability of the pole when it is subjected to mechanical stress; a larger cross-sectional area helps to improve the heat dissipation performance because a larger area can provide more surface area for heat dissipation; the cross-sectional area of the pole mounting hole 8 is 20 mm 2 , 30 mm 2 , 40 mm 2 , 20 mm 2 , 50 mm 2 and other values. Specifically, the appropriate mounting hole area can be selected according to the different capacity and power requirements of the battery, so that the size of the pole mounting hole 8 is more scientific and reasonable.

[0064] According to the cell frame 100 provided by the embodiments of the present utility model, the profile is bent and the two ends of the profile are welded together to form a closed-loop cell frame 100, and a receiving space 1 for placing the electrode core is formed inside the cell frame 100. Compared with the traditional method of stamping an electrode core groove for placing the electrode core on the aluminum shell of the cell, the cell frame 100 can accommodate the electrode core assembly 200 without using stamping technology during production, reducing the production cost. By arranging the explosion-proof valve hole 6, the liquid injection hole 7, and the pole column mounting hole 8 on the cell frame 100, the cell frame 100 integrates the functions of the traditional aluminum shell and cover plate (shell cover) of the cell. At the same time, by limiting the distances between the welding joint 14 and the explosion-proof valve hole 6, the liquid injection hole 7, and the pole column mounting hole 8, the functions of the explosion-proof valve hole 6, the liquid injection hole 7, and the pole column mounting hole 8 are not damaged after welding. By limiting the relationship between the distance from the welding joint 14 of the profile to the nearest bending angle 9, the length of the frame border where the welding joint 14 is located on the cell frame 100, and the radius distance of the bending angle 9, the influence of welding stress on the bending angle is reduced, avoiding deformation caused by welding heat; ensuring the strength of the welded joint, avoiding welding defects caused by too close distance; enabling the cell frame 100 to have a certain adjustment space during processing and assembly to adapt to different production conditions and precision requirements; improving the structural stability, reducing stress concentration caused by welding and bending, improving the structural durability, and ensuring the stability of the head and tail ends of the profile after welding.

[0065] In addition, an embodiment of the present utility model provides a processing technology for the cell frame 100, which is used to process the cell frame 100 in the above embodiment, and includes the following steps:

[0066] Prepare a profile with an explosion-proof valve;

[0067] Machine the pole column mounting hole 8 and the liquid injection hole 7;

[0068] Bend the profile;

[0069] Weld the ends of the head and tail of the profile to obtain the battery cell frame 100. In this embodiment, the profile is made by extrusion, so that the width of the profile can be any value according to requirements, and it has greater flexibility in production, so that the width of the border of the produced battery cell frame 100 (the thickness of the battery cell frame 100) has relatively large flexibility, and thus can be adapted to the pole core assemblies 200 of different thicknesses. At the same time, extruding a long strip-shaped profile can reduce the extrusion difficulty and production cost compared with extruding other structures such as frames. At the same time, the length of the extruded profile can be changed according to requirements, and can be greater than or equal to the length of the perimeters of multiple battery cell frames 100. The staff intercepts the required length of the battery cell frame 100 on the profile according to requirements; the length of the extruded profile can also be the perimeter of a single battery cell frame 100, so that the process of interception can be omitted, and the pole post mounting holes 8 and the liquid injection holes 7 can be directly processed on the profile.

[0070] In one embodiment, preparing a profile with an explosion-proof valve includes:

[0071] Machine a blind hole in the plate,

[0072] Machine a notch at the blind hole,

[0073] Cut the plate according to a preset length and width to obtain the profile. In this embodiment, the blind hole is the explosion-proof valve hole 6, and a notch is machined on the blind hole to form the explosion-proof valve. Here, the plate is the initial profile, and the required profile is obtained after processing the initial profile.

[0074] In one embodiment, preparing a profile with an explosion-proof valve includes:

[0075] Machine three first through holes, a second through hole and a third through hole with gradually decreasing hole diameters along the thickness direction in the plate;

[0076] Weld an explosion-proof sheet with a notch to the second through hole;

[0077] Lay an explosion-proof film on the first through hole. In this embodiment, the mutually connected first through hole, second through hole and third through hole form the explosion-proof valve hole 6. The explosion-proof valve hole 6 is a through hole, and the explosion-proof valve hole 6 is used for installing the explosion-proof sheet.

[0078] In one embodiment, machining the pole post mounting holes 8 and the liquid injection holes 7 includes:

[0079] Machine the pole post mounting holes 8 and the liquid injection holes 7 on the profile at a preset position by machining or stamping. In this embodiment, the profile is a long strip-shaped structure, and the battery cell frame 100 is a surrounding closed-loop square structure. Machining or stamping the pole post mounting holes 8 and the liquid injection holes 7 before bending the long strip-shaped profile is simpler and has lower cost than machining the pole post mounting holes 8 and the liquid injection holes 7 on the annular battery cell frame 100.

[0080] In one embodiment, in the step of welding the end portions at the head and tail of the profile together, the welding is friction welding, laser welding, high-frequency welding, or resistance welding. In this embodiment, after the profile is bent, the two opposite side surfaces in the width direction of the head end of the profile are flush with the two opposite side surfaces in the width direction of the tail end of the profile respectively. By means of welding methods such as friction welding, laser welding, or high-frequency welding, the head and tail ends of the profile can be stably welded together.

[0081] According to the processing technology of the battery cell frame 100 provided by the embodiment of the present utility model, first, a profile (long strip structure) is processed. The processed profile has an explosion-proof valve. After the profile is processed, a pole column mounting hole 8 and a liquid injection hole 7 are further processed on the profile with the explosion-proof valve. Then, the profile is bent. After the profile is bent into the required shape, the two ends of the profile are welded together to obtain the battery cell frame 100, so that the battery cell frame 100 can accommodate the electrode core assembly 200 without applying stamping technology during production, reducing the production cost.

[0082] In addition, as Figure 1 and Figure 2 shown, an embodiment of the present utility model provides a battery, which includes the battery cell frame 100 of the above embodiment, an electrode core assembly 200 disposed in the accommodation space 1 of the battery cell frame 100, a pole column assembly 12 and a plugging member 11 disposed on the battery 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 in the width direction of the battery cell frame 100 to seal both sides of the accommodation space 1 of the battery cell frame 100. There are two pole column mounting holes 8 and two pole column assemblies respectively. The two pole column assemblies are a positive pole column assembly and a negative pole column assembly respectively. The two pole column mounting holes 8 are a positive pole column mounting hole and a negative pole column mounting hole respectively. The positive pole column assembly is mounted in the positive pole column mounting hole, and the negative pole column assembly is mounted in the negative pole column mounting hole. The two housings 300 are respectively welded to both sides in the width direction of the battery cell frame 100 to complete the sealing of both sides of the accommodation space 1 of the battery cell frame 100, avoiding damage to the electrode core assembly 200 in the accommodation space 1 by the external environment. The battery of this embodiment does not need to use the stamping process, which can reduce the cost. The electrode core assembly 200, the battery cell frame 100, the two housings 300, the two pole column assemblies 12, and the plugging member 11 form a single battery cell. The battery can be composed of a single battery cell or multiple battery cells.

[0083] In one embodiment, the thickness of the battery cell frame 100 is 0.8 mm - 3.5 mm, and the thickness of the housing 300 is 0.1 mm - 0.5 mm. In this embodiment, the thickness of the battery cell frame 100 can be 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3.0 mm, etc., and the thickness of the battery cell frame 100 can vary according to the thickness of the electrode core. The thickness of the housing 300 can be 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.30 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.4 mm, etc. Relative to the housing 300, the battery cell frame 100 has a larger thickness, which helps to provide sufficient mechanical strength to protect the battery cell from external impacts and pressures; although the housing 300 has a smaller thickness, its main function is to encapsulate the battery cell and provide basic physical protection, while also needing to be lightweight; the smaller thickness of the housing helps to reduce the weight of the entire battery, and the thickness of the battery cell frame 100 can be adjusted within a certain range as needed to balance weight and strength; at the same time, the thickness of the battery cell frame 100 affects its heat dissipation ability, and a thicker battery cell frame 100 can provide better heat conduction performance. When designing the battery cell frame 100 and the housing 300 of the battery in this application, the above factors are comprehensively considered to ensure that the battery has sufficient safety, reliability, and performance while providing the required energy. In addition, the housing 300 of this embodiment does not require a stamping process, and the set thickness of the housing 300 is thinner than that of the housing 300 of a conventional battery, saving processing costs.

[0084] According to the battery provided by an embodiment of the present utility model, the electrode core assembly 200 is installed in the accommodation space of the battery cell frame 100, and is installed in the corresponding two electrode post mounting holes 8 through two electrode post assemblies 12, so that the two electrode post assemblies 12 are electrically connected to the positive electrode or the negative electrode of the electrode core assembly 200. By installing the sealing member 11 in the liquid injection hole 7, the sealing of the liquid injection hole 7 is completed. By welding the two housings 300 to both sides in the width direction of the battery cell frame 100 respectively, the sealing of both sides of the accommodation space 1 of the battery cell frame 100 is completed, avoiding damage to the electrode core assembly 200 in the accommodation space 1 by the external environment. By bending to form the battery cell frame 100, compared with stamping the housing 300, it is easier to control the dimensional accuracy of the connection. And the housing 300 of the present application does not need to be stamped, nor does it require a dedicated stamping die, so the situation of dimensional accuracy reduction caused by the reduction of die accuracy will not occur. After the frame body and the shell cover are connected, a corresponding accommodation space for installing the electrode core assembly can be formed, with a simpler structure and easier dimensional control. The embodiment of the present application can simplify the processing technology of the housing, improve the dimensional processing accuracy of the housing, and reduce the production cost of the housing. At the same time, when the battery cell frame 100 and the housing 300 of the present utility model are produced, the stamping technology is not used, which can reduce the production cost of the battery.

[0085] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A battery cell frame, characterized in that, The battery cell frame is formed by bending profiles, with an accommodation space for fixing the battery cell in the middle; The battery cell frame includes a first side frame and a second side frame that are parallel to each other in the horizontal direction, and a third side frame and a fourth side frame that are parallel to each other in the vertical direction. The first side frame is higher than the second side frame in the vertical direction; The battery cell frame is provided with explosion-proof valve holes, liquid injection holes, and pole column mounting holes at intervals on the first side frame, the second side frame, and the third side frame; Bending angles are formed at the bending points of the profiles, and the head and tail ends of the profiles are welded and fixed to form a welding joint. The distances from the welding joint to the explosion-proof valve holes, the liquid injection holes, and the pole column mounting holes are all ≥ 2 mm; The distance from the welding joint of the profile to the nearest bending angle is A, the length of the side frame on which the welding joint is located on the battery cell frame is B, and the radius of the bending angle is R, satisfying: 1.2R ≤ A ≤ 0.5B.

2. The cell frame according to claim 1, wherein The distance from the welding joint of the profile to the nearest bending angle is A, and the radius of the bending angle is 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 a notch for explosion-proof is provided on the blind hole.

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

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 in sequence. The diameters of the first through hole to the third through hole gradually decrease. The explosion-proof sheet is provided at the second through hole, and the explosion-proof film is provided 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 notch 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 pole column mounting hole and the liquid injection hole are located on the first side frame.

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

9. A battery, characterized in that, It includes the battery cell frame according to any one of claims 1 to 8, a pole core assembly disposed in the accommodation space of the battery cell frame, a pole column assembly and a plugging member disposed on the battery cell frame and electrically connected to the pole core assembly, and two shells. The two shells are respectively welded to both sides in the width direction of the battery cell frame to seal both sides of the accommodation space of the battery cell frame.

10. The battery according to claim 9, wherein The thickness of the battery cell frame is 0.8 mm - 3.5 mm, and the thickness of the shell is 0.1 mm - 0.5 mm.

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