Single battery

Abstract

The utility model discloses a single battery which comprises a frame and side plates, the frame comprises a base body and first connecting parts, the base body is enclosed to form an accommodating cavity for placing a battery cell, the first connecting parts are arranged on the end surfaces of openings on the two sides of the accommodating cavity, and the first connecting parts are connected with the base body; the first connecting parts are enclosed at the openings in the two sides of the accommodating cavity to form a connecting space and an assembling opening communicated with the connecting space, the connecting space is communicated with the accommodating cavity, the assembling opening is positioned on one side far away from the accommodating cavity, and the projection of the accommodating cavity is positioned in the area enclosed by the projection of the connecting space in the thickness direction of the single battery. The side plates are arranged in the connecting spaces, close the assembling openings and are connected with the adjacent first connecting parts. The side plate is arranged in the connecting space and seals the assembling opening, and the side plate is connected with the first connecting part. The single battery provided by the utility model solves the technical problem of improving the strength of the steel shell battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a single-cell battery. Background Technology

[0002] Existing square steel-cased batteries are typically manufactured using cold-rolled steel sheets, offering good mechanical strength and corrosion resistance, and are widely used in various power storage and power supply devices. Their structure usually includes a top cover and a one-piece molded bottom shell, sealed by laser welding, with rounded corners to reduce stress concentration. However, existing technology has several problems: First, despite the rounded corners, under extreme conditions, the corners of the steel shell can still become areas of stress concentration, increasing the risk of battery damage; second, the one-piece molded bottom shell is usually made of relatively thin steel, which cannot provide sufficient strength and is prone to deformation under severe impact or vibration. Therefore, there is an urgent need to improve the design of square steel-cased batteries to enhance their strength. Utility Model Content

[0003] One objective of this invention is to provide a single-cell battery that addresses the technical problem of improving the strength of steel-cased batteries.

[0004] To achieve the above objectives, this utility model provides a solution: a single-cell battery, characterized in that it includes: a frame and a side plate. The frame includes a base and a first connecting portion. The base encloses a cavity for placing the battery cell. The end faces of the openings on both sides of the cavity are provided with the first connecting portion, which is connected to the base. The first connecting portion encloses a connecting space and an assembly port communicating with the connecting space at the openings on both sides of the cavity. The connecting space communicates with the cavity, and the assembly port is located on the side away from the cavity. In the thickness direction of the single-cell battery, the projection of the cavity is located inside the area enclosed by the projection of the connecting space. The side plate is disposed in the connecting space and closes the assembly port. The side plate is connected to the adjacent first connecting portion.

[0005] Optionally, the frame includes a second connecting part and a third connecting part, both of which are arc-shaped and tangentially arranged. One end of the second connecting part is connected to the base, and the other end is connected to the third connecting part. The end of the third connecting part away from the second connecting part is connected to the first connecting part.

[0006] Optionally, the side panel has a chamfered edge facing the second connection, and the chamfered edge fits into the second connection.

[0007] Optionally, the thickness of the side panel is L1, and the thickness of the frame is L2, where 1.0 ≤ L1 / L2 ≤ 2.1.

[0008] Optionally, 1.7 ≤ L1 / L2 ≤ 2.0.

[0009] Optionally, the oppositely arranged side plates are provided with a first pressure relief groove and a second pressure relief groove. The extension directions of the first pressure relief groove and the second pressure relief groove are different, and their projections in the thickness direction of the side plates do not intersect.

[0010] Optionally, the base has a pressure relief hole communicating with the receiving cavity, and the frame includes a pressure relief plate, which is disposed on the shell and closes the pressure relief hole. The thickness of the pressure relief plate is less than or equal to the thickness of the base.

[0011] Optionally, the pressure relief holes on both sides of the receiving cavity are arranged symmetrically.

[0012] Optionally, the substrate is provided with injection holes, the radius of which is D1, 1.0mm≤D1≤10.0mm.

[0013] Optionally, the single cell includes a battery cell and a fuse. The battery cell is disposed in a housing cavity. One end of the fuse is electrically connected to the battery cell, and the other end is electrically connected to the frame. The fuse is used to melt at a preset temperature.

[0014] The beneficial effects of this utility model are as follows:

[0015] The single-cell battery includes a frame and a side plate. The frame includes a base and a first connecting portion. The base encloses a cavity for placing the cell. The cavity has first connecting portions on both sides, which enclose a connecting space and an assembly port communicating with the connecting space. The connecting space communicates with the cavity. In the thickness direction of the single-cell battery, the projection of the cavity lies within the area enclosed by the projection of the connecting space. The side plate is disposed in the connecting space and closes the assembly port. The side plate is connected to the first connecting portion.

[0016] In practical applications, during the assembly of a single battery cell, the battery is first installed into the receiving cavity through the assembly port and connecting space. Then, the side plate is placed in the connecting space and connected to the first connecting part using methods such as laser welding. The first connecting part provides sufficient connection space for laser welding, increasing the distance between the weld and the receiving cavity, thereby effectively reducing damage to the battery cell inside the receiving cavity from the laser beam during welding. Furthermore, when a single battery cell collides, because the first connecting part is located on the outside of the substrate, it collides with the external object first. This means that the side plate bears the main stress during the collision, rather than the battery cell inside the receiving cavity, effectively reducing the risk of cell failure during collision and further improving the battery's impact resistance and overall safety. Moreover, side plates of different thicknesses can be used to connect to the first connecting part to cope with different working conditions. The greater the thickness of the side plate, the stronger the impact resistance of the single battery cell and the less prone it is to extrusion deformation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is an exploded structural diagram of a single battery provided in an embodiment of the present invention;

[0019] Figure 2 This is a front view of the display frame provided in an embodiment of this utility model;

[0020] Figure 3 This is provided by the embodiment of the present utility model. Figure 2 A magnified view of a portion of region A in the middle;

[0021] Figure 4 This utility model provides a schematic diagram of the overall structure of a single battery cell and a cross-sectional structural diagram of the corresponding BB section.

[0022] Figure 5 This is provided by the embodiment of the present utility model. Figure 4 A magnified view of a portion of region C in the middle;

[0023] Figure 6 This is a partial structural schematic diagram of the injection hole provided in an embodiment of the present invention.

[0024] Explanation of icon numbers:

[0025] 20. Frame; 21. Base; 211. Pressure relief hole; 212. Liquid injection hole; 22. Placement cavity; 23. First connecting part; 24. Connecting space; 25. Assembly port; 26. Side plate; 261. Pressure relief groove; 262. Chamfered structure; 27. Second connecting part; 28. Third connecting part; 29. ​​Pressure relief plate; 30. Battery cell; 40. Fuse. Detailed Implementation

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

[0027] Please see Figures 1 to 5 As shown, Figure 1This is an exploded structural diagram of a single battery provided in an embodiment of the present invention. Figure 2 This is a front view of the display frame 20 provided in this embodiment of the utility model. Figure 3 This is provided by the embodiment of the present utility model. Figure 2 A magnified view of a portion of region A in the middle. Figure 4 This utility model provides a schematic diagram of the overall structure of a single battery cell and a cross-sectional schematic diagram of the corresponding BB section. Figure 5 This is provided by the embodiment of the present utility model. Figure 4 A magnified view of a portion of region C.

[0028] This utility model provides a single-cell battery, including a frame 20 and a side plate 26. The frame 20 includes a base 21 and a first connecting portion 23. The base 21 encloses a cavity for placing a cell 30. The end faces of the openings on both sides of the cavity are provided with the first connecting portion 23, which is connected to the base 21. The first connecting portion 23 encloses a connecting space 24 and an assembly port 25 communicating with the connecting space 24 at the openings on both sides of the cavity. The connecting space 24 is connected to the cavity, and the assembly port 25 is located on the side away from the cavity. In the thickness direction of the single-cell battery, the projection of the cavity is located inside the area enclosed by the projection of the connecting space 24 (i.e., a step is formed at the connection between the first connecting portion 23 and the base 21). The side plate 26 is disposed in the connecting space 24 and closes the assembly port 25. The side plate 26 is connected to the adjacent first connecting portion 23.

[0029] In practical applications, during the assembly of a single battery cell, the battery is first installed into the receiving cavity through the assembly port 25 and the connecting space 24. Then, the side plate 26 is placed in the connecting space 24, and the side plate 26 is connected to the first connecting part 23 by means of laser welding or other methods. The first connecting part 23 provides sufficient connecting space 24 for laser welding, increasing the distance between the weld and the receiving cavity, thereby effectively reducing the damage of the laser beam to the cell 30 inside the receiving cavity during the welding process. In addition, when a single battery cell is impacted, since the first connecting part 23 is located outside the base 21, it collides with the external object first. This causes the side plate 26 to bear the main stress during the impact, rather than the cell 30 inside the receiving cavity bearing the main stress. This effectively reduces the risk of cell 30 failure during the impact, further improving the battery's impact resistance and overall safety. Furthermore, side plates 26 and the first connecting part 23 of different thicknesses can be used to connect the cells, thus addressing different working conditions. The greater the thickness of the side plate 26, the stronger the impact resistance of the single battery cell, and the less likely it is to be deformed by compression.

[0030] In one embodiment, see Figure 5The frame 20 includes a second connecting part 27 and a third connecting part 28. Both the second connecting part 27 and the third connecting part 28 are arc-shaped and are tangentially arranged. One end of the second connecting part 27 is connected to the base 21 and the other end is connected to the third connecting part 28. The end of the third connecting part 28 away from the second connecting part 27 is connected to the first connecting part 23.

[0031] In practical applications, the arc-shaped design of the second connecting part 27 and the third connecting part 28 effectively avoids sharp angles, thereby reducing stress concentration. The arc-shaped structure can distribute stress more evenly when subjected to external impacts or mechanical stress, reducing the occurrence of localized stress concentration. Through tangential arrangement, the connection between the second connecting part 27 and the third connecting part 28 is smoother, further avoiding stress concentration problems caused by abrupt changes between the connecting parts. This design improves the overall strength of the frame 20, enhances the battery's impact resistance and durability under various operating conditions, and thus improves the safety and reliability of the individual battery cells.

[0032] Further, see Figure 5 The side plate 26 has a chamfered structure 262 on the edge facing the second connecting part 27, and the chamfered structure 262 fits into the second connecting part 27.

[0033] In practical applications, the chamfered structure 262 increases the contact area between the side plate 26 and the second connecting portion 27, thereby effectively reducing stress concentration. By optimizing the geometry of the connection, the chamfer design makes the contact between the side plate 26 and the second connecting portion 27 more uniform. The increased contact area can disperse stress and reduce the risk of potential structural failures or damage caused by excessive local stress. In addition, the increased contact area also helps to improve the overall strength and stability of the connection, ensuring that the single cell can more stably withstand stress when subjected to external impacts or vibrations, thereby improving the safety and reliability of the battery.

[0034] In one embodiment, see Figure 5 The thickness of the side plate 26 is L1, the thickness of the frame 20 is L2, and 1.0≤L1 / L2≤2.1.

[0035] In practical applications, by appropriately selecting this ratio, the overall strength and weight distribution of a single battery cell can be optimized. When the thickness of the side plate 26 is appropriately increased, it can more effectively disperse external impacts and stresses, thereby improving the battery's impact resistance and safety. Conversely, appropriately reducing the thickness of the frame 20 can effectively reduce the overall weight of the single battery cell while ensuring that the frame 20 possesses sufficient structural strength and rigidity. This ratio range allows the battery to optimize its size and weight while maintaining strength and safety, meeting the design requirements of high-performance batteries and thus improving the overall performance of the single battery cell.

[0036] Further, see Figure 5 , 1.7≤L1 / L2≤2.0.

[0037] In one embodiment, reference is made to Figure 1 The side plate 26 is provided with a first pressure relief groove 261 and a second pressure relief groove 261. The extension directions of the first pressure relief groove 261 and the second pressure relief groove 261 are different, and their projections in the thickness direction of the side plate 26 do not intersect.

[0038] In practical applications, this design features a first pressure relief groove 261 and a second pressure relief groove 261 positioned opposite each other on the side plate 26. These two grooves extend in different directions, and their projections onto the thickness of the side plate 26 do not intersect. This structural design effectively guides the gas generated by the battery under high voltage or overcharge conditions to escape along different paths, preventing gas concentration in one direction and reducing pressure fluctuations and stress concentration during the pressure relief process, thereby improving battery safety.

[0039] Specifically, the different extension directions of the first and second pressure relief grooves 261 ensure that gas can be discharged simultaneously through multiple channels, avoiding the uneven pressure relief problem that may be caused by a single pressure relief channel. Moreover, their projections in the thickness direction of the side plate 26 do not intersect, effectively enhancing the structural strength of the side plate 26, reducing stress concentration at the first and second pressure relief grooves 261, significantly reducing the risk of battery rupture caused by gas expansion, and enhancing the reliability and safety of individual cells.

[0040] In this embodiment, the first pressure relief groove 261 and the second pressure relief groove 261 are respectively opened on the two side plates 26. In other embodiments, the first pressure relief groove 261 and the second pressure relief groove 261 can also be opened in parallel on one side plate 26 or both side plates 26 can be opened in parallel with the first pressure relief groove 261 and the second pressure relief groove 261.

[0041] In one embodiment, reference is made to Figure 2 The substrate 21 has a pressure relief hole 211 that communicates with the receiving cavity;

[0042] The frame 20 includes a pressure relief plate 29, which is disposed on the housing and closes the pressure relief hole 211. The thickness of the pressure relief plate 29 is less than or equal to the thickness of the base 21.

[0043] In practical applications, the pressure relief hole 211 provides a channel for gas to escape quickly when the internal pressure of the battery is too high, preventing the battery from expanding or rupturing due to gas accumulation. The pressure relief plate 29 is designed to provide a controllable pressure release area at the pressure relief hole 211.

[0044] The thickness of the pressure relief plate 29 is less than or equal to the thickness of the base 21, which ensures that when the internal gas pressure of the battery reaches a certain threshold, the pressure relief plate 29 will deform or rupture first, thereby guiding the gas to be safely discharged. This can effectively avoid safety accidents caused by a sharp increase in the internal pressure of the battery. At the same time, the combined design of the pressure relief hole 211 and the pressure relief plate 29 can effectively guide the gas to be discharged along a specific path, reducing the problem of uneven pressure during the gas pressure relief process.

[0045] Furthermore, referring to Figure 2 The pressure relief holes 211 on both sides of the cavity are symmetrically arranged.

[0046] In practical applications, the symmetrically arranged pressure relief holes 211 can evenly distribute the pressure inside the battery, helping to maintain the stability of the battery casing, reduce stress concentration caused by pressure imbalance, and thus improve the overall safety of the battery. Furthermore, this design allows for more balanced gas release, effectively reducing the risk of battery damage due to localized gas accumulation or insufficient pressure relief, and improving battery reliability under extreme operating conditions.

[0047] In one embodiment, reference is made to Figure 6 The substrate 21 has an injection hole 212, the radius of which is D1, 1.0mm≤D1≤10.0mm.

[0048] In practical applications, by creating injection holes 212 on the substrate 21, a convenient method is provided for liquid injection or gas release during battery assembly. The radius of the injection holes 212 ranges from 1.0 mm to 10.0 mm, effectively balancing the liquid injection volume with the hole size, thereby ensuring the accuracy and stability of liquid filling inside the battery, while avoiding the adverse effects caused by excessively large or small hole diameters.

[0049] In one embodiment, reference is made to Figure 2 The single battery includes a cell 30 and a fuse 40. The cell 30 is disposed in the housing cavity. One end of the fuse 40 is electrically connected to the cell 30 and the other end is electrically connected to the frame 20. The fuse 40 is used to melt at a preset temperature.

[0050] In practical applications, by incorporating a fuse 40 within a single battery cell, a safety protection mechanism is provided to prevent the battery from becoming dangerous under overheating conditions. The fuse 40 forms an electrical connection between the cell 30 and the frame 20, and can melt and break when the internal temperature of the battery exceeds a preset value, thereby severing the electrical connection between the cell 30 and the frame 20 and preventing further thermal runaway or electrical failure of the battery.

[0051] In this embodiment, the material of the safety part 40 is tin. In other embodiments of this application, the material of the safety part 40 may also be zinc, tin-bismuth alloy, copper alloy, etc.

[0052] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0053] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0054] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0055] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A single-cell battery, characterized in that, include: The frame includes a base and a first connecting part. The base encloses a cavity for placing a battery cell. The end faces of the openings on both sides of the cavity are provided with the first connecting part. The first connecting part is connected to the base. The first connecting part encloses a connecting space and an assembly port communicating with the connecting space at the openings on both sides of the cavity. The connecting space is communicating with the cavity. The assembly port is located on the side away from the cavity. In the thickness direction of the single battery cell, the projection of the cavity is located inside the area enclosed by the projection of the connecting space. A side plate is disposed in the connection space and closes the assembly opening. The side plate is connected to the adjacent first connection part.

2. The single-cell battery according to claim 1, characterized in that, The frame includes a second connecting part and a third connecting part, both of which are arc-shaped and tangentially arranged. One end of the second connecting part is connected to the base, and the other end is connected to the third connecting part. The end of the third connecting part away from the second connecting part is connected to the first connecting part.

3. The single-cell battery according to claim 2, characterized in that, The side plate has a chamfered structure along its edge facing the second connecting part, and the chamfered structure fits into the second connecting part.

4. The single-cell battery according to claim 1, characterized in that, The thickness of the side plate is L1, and the thickness of the frame is L2, where 1.0 ≤ L1 / L2 ≤ 2.

1.

5. The single-cell battery according to claim 4, characterized in that, 1.7≤L1 / L2≤2.

0.

6. The single-cell battery according to claim 1, characterized in that, The side plates, which are arranged opposite to each other, have a first pressure relief groove and a second pressure relief groove. The extension directions of the first pressure relief groove and the second pressure relief groove are different, and their projections in the thickness direction of the side plates do not intersect.

7. The single-cell battery according to any one of claims 1 to 6, characterized in that, The substrate has a pressure relief hole that communicates with the receiving cavity; The frame includes a pressure relief plate disposed on the housing and closing the pressure relief hole, the thickness of the pressure relief plate being less than or equal to the thickness of the base.

8. The single-cell battery according to claim 7, characterized in that, The pressure relief holes on both sides of the receiving cavity are symmetrically arranged.

9. The single-cell battery according to any one of claims 1 to 6, characterized in that, The substrate has a liquid injection hole with a radius of D1, where 1.0 mm ≤ D1 ≤ 10.0 mm.

10. The single-cell battery according to any one of claims 1 to 6, characterized in that, The single battery cell includes a battery cell and a fuse. The battery cell is disposed in the receiving cavity. One end of the fuse is electrically connected to the battery cell, and the other end is electrically connected to the frame. The fuse is used to melt at a preset temperature.

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