Single battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a single battery and an electric device. The single battery comprises a fixed frame and two electrode assemblies, connecting tabs are arranged at the two ends of each electrode assembly in the first direction, the two electrode assemblies are connected in series end to end in the first direction, and the connecting tabs, close to each other, in the two electrode assemblies are in lap joint with each other; wherein a containing groove is formed in the end, close to the other electrode assembly, of one electrode assembly in the two electrode assemblies, the two connecting tabs which are in lap joint with each other are contained in the containing groove, and a protective pad is arranged in the containing groove in a matched mode; the fixing frame is arranged on the periphery of the electrode assemblies in a surrounding mode, and a containing cavity for containing the electrode assemblies is formed. According to the single battery, the battery cell in the single battery is divided into a plurality of electrode assemblies, so that the length of a single electrode assembly can be reduced, good support of the interior of a long battery cell structure is realized, the structural strength is higher, and the use safety of the single battery can be improved.

Description

Technical Field

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

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their performance and safety. The lithium-ion cell is a core component for safety and assembly, and its structural design is crucial to the overall safety of the battery pack.

[0003] Current battery cell structures are generally short, and the potential for overall capacity improvement is limited by manufacturing processes. Therefore, battery cell structures are evolving towards longer cells. However, for longer cells, the electrode assembly often bends and deforms due to strength issues, leading to reduced product yield. Directly connecting multiple short cells in series to form a long cell increases structural costs and wastes space. Currently, the molding process for long and extra-long cells is demanding, and the manufacturing of the internal support structure is difficult. Furthermore, the tabs of long cells are prone to overlap when bent, resulting in insufficient protection. The use of C- or S-shaped bends for the tabs further increases their length and requires more space. On the other hand, due to the longer cell length, in the event of thermal runaway, the gas cannot be released quickly due to the long and obstructed path, reducing the cell's safety performance. Moreover, the internal electrode assembly support is prone to imbalance, and the electrode assembly is easily damaged during movement.

[0004] Therefore, there is an urgent need to provide a new type of single-cell battery and power device to solve the above-mentioned technical problems in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a single-cell battery that can achieve good internal support for the long cell structure, and has higher structural strength, thereby improving the safety of the single-cell battery in use.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The single battery includes a fixed frame and two electrode assemblies. Each electrode assembly has a connecting tab at both ends along a first direction. The two electrode assemblies are connected in series along the first direction, and the connecting tabs of the two electrode assemblies that are close to each other overlap. One of the two electrode assemblies has a receiving groove at its end near the other electrode assembly. The two overlapping connecting tabs are housed in the receiving groove, and a protective pad is provided in the receiving groove. The fixed frame is arranged around the outer periphery of the two electrode assemblies and forms a receiving cavity for accommodating the electrode assemblies.

[0008] Optionally, two of the aforementioned receiving grooves and two of the aforementioned protective pads are provided; the two aforementioned receiving grooves are respectively provided at both ends of the aforementioned connecting tabs along the second direction, and the two aforementioned connecting tabs that overlap each other are sandwiched between the two aforementioned protective pads.

[0009] Optionally, the dimension of the protective pad along the second direction is not greater than the dimension of the receiving groove along the second direction.

[0010] Optionally, the aforementioned single battery cell further includes a battery casing and two cover plate assemblies. The aforementioned electrode assembly and the aforementioned fixing frame are both disposed within the aforementioned battery casing. The aforementioned battery casing has opening structures at both ends along the aforementioned first direction, and the aforementioned cover plate assemblies are correspondingly and sealed within the opening structures.

[0011] Optionally, at least one of the two cover plate assemblies includes a cover plate body, the cover plate body being integrally formed with a pole post protrusion, and the connecting tab being correspondingly connected to the pole post protrusion.

[0012] Optionally, at least a portion of the aforementioned fixing frame is sandwiched between the cover plate body and the electrode assembly at one end opposite to each other along the first direction.

[0013] Optionally, the cover plate assembly is provided with an explosion-proof valve. Optionally, an insulating support plate is sandwiched between two adjacent electrode assemblies, the insulating support plate having a support hole, and the connecting tab passing through the support hole.

[0014] Optionally, the fixed frame is provided with clearance holes at both ends along the first direction, and the connecting tabs located at the outermost end along the first direction are respectively inserted into the clearance holes.

[0015] Another objective of this invention is to provide an electrical device that specifically includes a single battery as described in any of the above embodiments.

[0016] Beneficial effects:

[0017] This invention relates to a single-cell battery that connects several electrode assemblies end-to-end to form a long cell. A fixing frame is then encircled and fixed around the electrode assemblies, securing adjacent electrode assemblies and improving the structural strength of the long cell. Simultaneously, one of the adjacent electrode assemblies has a receiving groove at its end near the other, where the two overlapping connecting tabs are accommodated. This reduces the overall length of the series-connected electrode assemblies. A protective pad fills the receiving groove, protecting the connecting tabs within. This single-cell battery divides the internal cell into several electrode assemblies, reducing the length of individual electrode assemblies and preventing defects such as surface wrinkles, deformation, delamination, and breakage caused by excessively long electrode assemblies. Furthermore, the fixing frame secures the connected electrode assemblies, and the protective pad protects the connecting tabs, enhancing the safety of the single-cell battery. Attached Figure Description

[0018] Figure 1 This is an exploded view of a single battery provided in a specific embodiment of this utility model;

[0019] Figure 2 This is an exploded view of a single battery cell with some structural elements hidden, provided in a specific embodiment of this utility model.

[0020] Figure 3 This is an isometric view of the electrode assembly provided in a specific embodiment of this utility model;

[0021] Figure 4 This is an isometric view of the fixed frame provided in a specific embodiment of this utility model;

[0022] Figure 5 This is an isometric view of the insulating support plate provided in a specific embodiment of this utility model.

[0023] In the picture:

[0024] 100. Electrode assembly; 110. Connecting tab; 120. Receiving slot; 121. Protective pad;

[0025] 200. Fixed frame; 201. Receiving cavity; 202. Clearance hole; 203. Through hole; 210. Insulating support plate; 211. Support hole;

[0026] 300. Battery casing; 301. Opening structure; 310. Cover plate assembly; 311. Cover plate body; 312. Terminal post protrusion; 313. Explosion-proof valve; 320. Insulating film. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] The first direction described in this embodiment is: Figures 1 to 3 The X direction shown is the length direction of a single cell, and the second direction is... Figures 1 to 3 The Y direction shown is the thickness direction of a single cell, and the first and second directions are perpendicular to each other.

[0032] Please refer to Figures 1 to 3The single battery includes a fixing frame 200 and two electrode assemblies 100. Each electrode assembly 100 has a connecting tab 110 at both ends along a first direction. The two electrode assemblies 100 are connected in series along the first direction, and the connecting tabs 110 of the two electrode assemblies 100 that are close to each other overlap. One of the electrode assemblies 100 has a receiving groove 120 at the end near the other electrode assembly 100. The two overlapping connecting tabs 110 are housed in the receiving groove 120, and a protective pad 121 is provided in the receiving groove 120. The fixing frame 200 is arranged around the outer periphery of the two electrode assemblies 100 and forms a receiving cavity 201 for accommodating the electrode assemblies 100.

[0033] In this embodiment, the single battery cell is formed by connecting two electrode assemblies 100 end to end in series to form a long battery cell. Then, a fixing frame 200 is used to surround and fix the electrode assembly 100 around its outer periphery, thereby fixing the two adjacent electrode assemblies 100 and improving the structural strength of the long battery cell. At the same time, in the two adjacent electrode assemblies 100, one electrode assembly 100 is provided with a receiving groove 120 near the end of the other electrode assembly 100. The two overlapping connecting tabs 110 are accommodated in the receiving groove 120, reducing the overall length of the two electrode assemblies 100 after being connected in series. A protective pad 121 is used to fill the receiving groove 120 to protect the connecting tabs 110 in the receiving groove 120. The single battery divides the internal cell into two electrode assemblies 100, which can reduce the length of a single electrode assembly 100 and avoid defects such as surface wrinkles, deformation, delamination, and breakage caused by excessively long electrode assemblies 100. At the same time, the fixing frame 200 fixes the connected electrode assemblies 100, and the protective pad 121 protects the connecting tabs 110, thereby improving the safety of the single battery.

[0034] Preferably, the aforementioned fixed frame 200 is integrally molded by injection molding, which reduces the number of parts and simplifies the assembly process.

[0035] Specifically, the two overlapping connecting tabs 110 are fixed by horizontal welding, which simplifies the process, further reduces internal resistance, saves the length of the connecting tabs 110, reduces the space occupied by the connecting tabs 110 inside the single cell, and improves the energy density of the single cell.

[0036] Please continue to refer to this. Figure 1The aforementioned single-cell battery also includes a battery casing 300 and two cover plate assemblies 310. The electrode assembly 100 and the fixing frame 200 are both disposed within the battery casing 300. The battery casing 300 has openings 301 at both ends along the first direction, and the cover plate assemblies 310 are correspondingly and sealingly disposed within the openings 301. After the two electrode assemblies 100 and the fixing frame 200 are fixed to form a long cell structure, they can be pushed into the battery casing 300 through the openings 301. The openings 301 are then sealed using the cover plate assemblies 310, completing the assembly of the single-cell battery.

[0037] Optionally, at least one of the two cover plate assemblies 310 includes a cover plate body 311, which has an integrally formed electrode post protrusion 312, and the connecting tab 110 is correspondingly connected to the electrode post protrusion 312. Specifically, in this embodiment, both cover plate assemblies 310 have a structure in which the cover plate body 311 is integrally formed with the electrode post protrusion 312. In this case, the positive electrode cover is a structure formed from a plain aluminum sheet with the electrode post protrusion 312, which simplifies the structure of the cover plate assembly 310, increases the space utilization of the single battery, and improves the energy density.

[0038] Optionally, the outer walls of the two electrode assemblies 100 are covered with an insulating film 320, which is sandwiched between the battery casing 300 and the outer walls of the electrode assemblies 100. In this embodiment, during assembly, the two electrode assemblies 100 are first connected end-to-end. Then, the fixing frame 200 is fixed to the sides of the two electrode assemblies 100 using adhesive or heat-sealing methods to form the desired long cell structure. Next, an insulating film 320 is covered onto the outer surface of this long cell structure. The insulating film 320 has a slit corresponding to the position of the explosion-proof valve 313 to facilitate pressure relief and venting. The insulating film 320 is a commonly used Mylar film. Finally, the covered long cell structure is pushed into the battery casing 300 and the cover plate assembly 310 is installed, thus assembling the single battery.

[0039] In this embodiment, as Figure 2 As shown, at least a portion of the aforementioned fixing frame 200 is sandwiched between the cover plate body 311 and the electrode assembly 100 at opposite ends along the first direction. It should be noted that the fixing frame 200 is made of insulating material, specifically an integrally injection-molded plastic part, which serves to insulate both the cover plate body 311 and the electrode assembly 100, reducing the use of lower plastic parts and lowering production costs.

[0040] Optionally, the cover plate assembly 310 is provided with an explosion-proof valve 313. In this embodiment, the explosion-proof valve 313 is disposed on the cover plate assembly 310, and the explosion-proof valve 313 on each cover plate assembly 310 corresponds to one electrode assembly 100. When the electrode assembly 100 experiences thermal runaway, it can realize the corresponding explosion-proof pressure relief for each electrode assembly 100. The explosion-proof pressure relief path will not be blocked by other components, shortening the pressure relief path and improving the safety of battery use.

[0041] like Figure 2 and Figure 3 As shown, two of each of the aforementioned receiving grooves 120 and protective pads 121 are provided. The two receiving grooves 120 are respectively located at both ends of the connecting tabs 110 along the second direction, and the two overlapping connecting tabs 110 are sandwiched between the two protective pads 121. That is, the connecting tabs 110 are located at the middle position of the electrode assembly 100 along the second direction, so that the two receiving grooves 120 and the two protective pads 121 are symmetrically distributed. This allows the protective pads 121 to protect the connecting tabs 110 from both sides, improving protection performance and preventing damage to the connecting tabs 110 from foreign objects. Simultaneously, during the process of the two electrode assemblies 100 forming a long cell structure and being pushed into the battery casing 300, the connecting tabs 110 are clamped and fixed from both directions, preventing bending and deformation of the connecting tabs 110.

[0042] Specifically, the dimension of the protective pad 121 along the second direction is not greater than the dimension of the receiving groove 120 along the second direction. If the dimension of the protective pad 121 along the second direction is too large and exceeds the dimension of the receiving groove 120 along the second direction, the protective pad 121 will extend beyond the plane of the motor assembly. During the assembly of the long cell structure, the battery casing 300 will squeeze the protective pad 121, causing damage to the connecting tab 110 and increasing the internal resistance, which is not conducive to improving the safety of the single cell. Therefore, setting the dimension of the protective pad 121 along the second direction to be no greater than the dimension of the receiving groove 120 along the second direction can avoid squeezing damage to the connecting tab 110.

[0043] Furthermore, such as Figure 2 and Figure 5 As shown, an insulating support plate 210 is sandwiched between two adjacent electrode assemblies 100. The insulating support plate 210 has a support hole 211, and the connecting tab 110 passes through the support hole 211. The insulating support plate 210 not only supports and fixes the connecting tab 110, but also insulatingly separates the two adjacent electrode assemblies 100, thus providing insulation. Furthermore, when the long cell structure formed by the two electrode assemblies 100 is pushed into the battery casing 300, it balances the pushing force and limits the insertion, improving the efficiency of the long cell structure entering the casing.

[0044] It should be noted that the insulating support plate 210 insulatingly separates two adjacent electrode assemblies 100, so that each electrode assembly 100 is contained in different chambers separated by the fixed frame 200 and the insulating support plate 210. Each electrode assembly 100 can correspond to an annular exhaust channel. When the electrode assembly 100 experiences thermal runaway, it can quickly release pressure and exhaust gas from the corresponding annular exhaust channel and from the corresponding explosion-proof valve 313. Its pressure release and exhaust effect is better, which can improve the safety of the single battery.

[0045] like Figure 3 and Figure 4 As shown, the fixed frame 200 has clearance holes 202 at both ends along the first direction, and the connecting tabs 110 located at the outermost end along the first direction are correspondingly inserted into the clearance holes 202. The clearance holes 202 not only allow the connecting tabs 110 of the electrode assembly 100 to pass through the fixed frame 200 and connect to the cover plate assembly 310, providing support for the connecting tabs 110, but also shorten the length of the connecting tabs 110, thereby reducing production costs.

[0046] Furthermore, the outer wall of the fixing frame 200 is provided with two through holes 203, which can reduce the weight of the fixing frame 200, thereby reducing the weight of the single cell and increasing its energy density.

[0047] In this embodiment, the wall thickness of the fixed frame 200 is L, the thickness of the insulating support plate 210 is H, the thickness of the insulating film 320 is T, and the dimension of the receiving groove 120 along the first direction is W; 5mm < W < 10mm, 0.5mm < L < 3mm, 0.5mm < H < 2mm, 0.1mm < T < 0.3mm. Those skilled in the art can select the values ​​of the above parameters according to specific needs, which will not be elaborated here.

[0048] This embodiment also provides an electrical device, which specifically includes a single battery cell as described in any of the above embodiments. This electrical device can be a battery pack, a pure electric vehicle, a hybrid electric vehicle, a ship, or an energy storage device, etc., which will not be elaborated further here. This electrical device uses the aforementioned single battery cell for power supply, thereby possessing all the beneficial effects of the single battery cell described in any of the above embodiments, which will not be elaborated further here. Specifically, the single battery cell used in this electrical device can reduce the length of a single electrode assembly 100, avoiding adverse phenomena such as surface wrinkles, deformation, delamination, and breakage caused by an excessively long electrode assembly 100. Simultaneously, the fixing frame 200 protects the connected electrode assemblies 100, improving the safety of the electrical device.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A single-cell battery, characterized in that, include: Two electrode assemblies are provided with connecting tabs at both ends along a first direction. The two electrode assemblies are connected in series from end to end along the first direction, and the connecting tabs of the two electrode assemblies that are close to each other overlap each other. One of the two electrode assemblies has a receiving groove at the end near the other electrode assembly, and the two overlapping connecting tabs are housed in the receiving groove. A protective pad is provided in the receiving groove. A fixed frame is arranged around the outer periphery of the two electrode assemblies and forms a receiving cavity for accommodating the electrode assemblies.

2. The single-cell battery according to claim 1, characterized in that, Two of each of the receiving grooves and the protective pads are provided; the two receiving grooves are respectively provided at both ends of the connecting tabs along the second direction, and the two connecting tabs that overlap each other are sandwiched between the two protective pads.

3. The single-cell battery according to claim 2, characterized in that, The dimension of the protective pad along the second direction is not greater than the dimension of the receiving groove along the second direction.

4. The single-cell battery according to claim 1, characterized in that, The single battery also includes a battery casing and two cover plate assemblies. The electrode assembly and the fixing frame are both disposed inside the battery casing. The battery casing has opening structures at both ends along the first direction, and the cover plate assemblies are sealed to the opening structures one by one.

5. The single-cell battery according to claim 4, characterized in that, At least one of the two cover plate assemblies includes a cover plate body, the cover plate body being integrally formed with a pole post protrusion, and the connecting tab being correspondingly connected to the pole post protrusion.

6. The single-cell battery according to claim 5, characterized in that, At least a portion of the fixing frame is clamped between the cover plate body and the sidewall of the electrode assembly opposite to each other along the first direction.

7. The single-cell battery according to claim 4, characterized in that, The cover plate assembly is equipped with an explosion-proof valve.

8. The single-cell battery according to any one of claims 1-7, characterized in that, An insulating support plate is sandwiched between two adjacent electrode assemblies. The insulating support plate has a support hole, and the connecting tab passes through the support hole.

9. The single-cell battery according to any one of claims 1-7, characterized in that, The fixed frame is provided with clearance holes at both ends along the first direction, and the connecting tabs located at the outermost end along the first direction are respectively inserted into the clearance holes.

10. An electrical appliance, characterized in that, Includes the single-cell battery as described in any one of claims 1-9.

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