Single battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a single battery and electric equipment. The single battery comprises a plurality of electrode assemblies and a plurality of side plate assemblies, connecting tabs are arranged at the two ends of each electrode assembly in the length direction of the electrode assembly, the electrode assemblies are connected in series end to end in the length direction of the electrode assembly, and the connecting tabs close to each other in every two adjacent electrode assemblies are in lap joint with each other; the side plate assemblies comprise side edge parts and connecting parts, the side edge parts are attached to the side edge of one end of the electrode assembly in the width direction of the electrode assembly in a one-to-one correspondence mode, the connecting parts abut against the side walls of the two ends of the electrode assembly in the length direction of the electrode assembly, and the connecting parts of every two adjacent side plate assemblies abut against each other. According to the single battery, good support in the long battery cell structure can be realized, the structural strength is higher, and the use safety of the single battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a single battery and an electrical equipment using the same. Background Art

[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 fields, and the requirements for the performance and safety of lithium-ion batteries are increasing day by day. The lithium battery cell is a core component for safety and assembly, and its structural design is crucial for the safety of the whole battery pack.

[0003] The existing battery cell structure is generally short, and the space for improving the overall capacity is limited by process conditions. Therefore, the battery cell structure is developing in the direction of long battery cells. For battery cells with a longer length, due to the strength problem of the electrode group, bending deformation often occurs, resulting in a reduction in the product yield. If multiple short battery cells are directly connected in series to form a long battery cell, it will increase the structural cost and cause space waste. At present, for long battery cells and especially for extra-long battery cells, the forming process requirements are high, and the manufacturing difficulty of the internal support structure of the battery cell is large. At the same time, when the tabs of the long battery cell are bent, they are prone to overlap, and the protection is insufficient. Moreover, when the tabs are bent in a C-shaped or S-shaped manner to connect the tabs, the tab length is long, and more space is required. On the other hand, due to the long length of the battery cell, when the battery cell undergoes thermal runaway, the gas cannot be quickly released because the path is long and blocked, reducing the safety performance of the battery cell. Moreover, the support of the electrode group inside the battery cell is prone to imbalance, and the electrode group is prone to damage when it moves.

[0004] Therefore, there is an urgent need to provide a new type of single battery and an electrical equipment using the same to solve the above technical problems in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a single battery, which can achieve good support inside the long battery cell structure, has higher structural strength, and can improve the use safety of the single battery.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The single battery includes a plurality of electrode assemblies and a plurality of side plate assemblies. Connecting tabs are arranged at both ends of each of the electrode assemblies along its length direction. The plurality of electrode assemblies are connected in series end to end along their length directions, and the connecting tabs of two adjacent electrode assemblies that are close to each other overlap each other. The side plate assemblies include side parts and connecting parts. The side parts are respectively attached to one side of each of the electrode assemblies along its width direction, and the connecting parts are abutted against the side walls at both ends of each of the electrode assemblies along its length direction. The connecting parts of two adjacent side plate assemblies are abutted against each other.

[0008] Optionally, two of the above-mentioned side plate assemblies are attached to each of the above-mentioned electrode assemblies, and the two above-mentioned side plate assemblies are oppositely arranged at both ends of the above-mentioned electrode assembly along its width direction.

[0009] Optionally, between the two oppositely arranged connecting parts in the two oppositely arranged side plate assemblies, there is an installation gap with a preset width, and the size of the installation gap along the width direction of the above-mentioned electrode assembly is not less than the size of the above-mentioned connecting tab along the width direction of the above-mentioned electrode assembly.

[0010] Optionally, the thickness of the above-mentioned side part is L, and the thickness of the above-mentioned connecting part is W, where 0.3 mm < L < 1 mm and 2.5 mm ≤ W ≤ 5 mm.

[0011] Optionally, the above-mentioned single cell further includes two cover plates, and the two above-mentioned cover plates are oppositely arranged and are respectively connected to the two outermost above-mentioned connecting tabs among several above-mentioned electrode assemblies.

[0012] Optionally, support plates are arranged at both ends of the above-mentioned electrode assembly along its length direction, and the support plates are provided with support holes for the above-mentioned connecting tabs to pass through.

[0013] Optionally, both of the above-mentioned cover plates are provided with first explosion-proof valves.

[0014] Optionally, the above-mentioned single cell further includes a battery housing, the above-mentioned cover plates are hermetically arranged at the openings at both ends of the above-mentioned battery housing respectively, several above-mentioned electrode assemblies are all arranged inside the above-mentioned battery housing, and several second explosion-proof valves are arranged on the outer wall of the above-mentioned battery housing.

[0015] Optionally, the above-mentioned second explosion-proof valves are arranged on the side walls at both ends of the above-mentioned battery housing along its thickness direction, and the above-mentioned second explosion-proof valves are located at the joints of two adjacent above-mentioned electrode assemblies.

[0016] Another object of the present invention is to provide an electrical device, and this electrical device includes the single cell as described in any of the above solutions.

[0017] Beneficial effects:

[0018] In the single battery of the present utility model, a plurality of electrode assemblies are connected end to end in series to form a long battery core. Subsequently, a side plate assembly is attached to the two side walls of the electrode assembly along its width direction, the side edge part of the side plate assembly is attached to the side edge of the electrode assembly, and the connecting part of the side plate assembly is arranged at both ends of the top assembly along its length direction, so that the connecting parts of the side plate assemblies of two adjacent electrode assemblies abut against each other, realizing the fixation of two adjacent electrode assemblies and improving the structural strength of the long battery core. The single battery divides the internal battery core into a plurality of electrode assemblies, which can reduce the length of a single electrode assembly and avoid bad phenomena such as surface wrinkles, deformation, layer displacement, and fracture caused by too long electrode assemblies. At the same time, the side plate assembly protects the connected connecting ear, improving the use safety of the single battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded view of the single battery provided by the specific embodiment of the present utility model;

[0020] Figure 2 is a cross-sectional view of the single battery provided by the specific embodiment of the present utility model;

[0021] Figure 3 is a longitudinal sectional view of the single battery with some components hidden provided by the specific embodiment of the present utility model;

[0022] Figure 4 is an axonometric view of the side plate assembly provided by the specific embodiment of the present utility model;

[0023] Figure 5 is a side view of the side plate assembly provided by the specific embodiment of the present utility model.

[0024] In the figure:

[0025] 100, electrode assembly; 110, connecting ear; 200, side plate assembly; 210, side edge part; 220, connecting part; 300, battery housing; 310, second explosion-proof valve; 400, cover plate; 410, first explosion-proof valve; 500, support plate; 510, support hole; 600, coating film. SPECIFIC EMBODIMENTS

[0026] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0027] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] As Figures 1 to 4 shown, the single cell includes a plurality of electrode assemblies 100 and a plurality of side plate assemblies 200. Connection tabs 110 are provided at both ends of each of the electrode assemblies 100 along its own length direction. A plurality of the electrode assemblies 100 are connected in series end to end along their own length directions, and the adjacent connection tabs 110 of two adjacent electrode assemblies 100 are overlapped with each other; the side plate assemblies 200 include side portions 210 and connection portions 220. The side portions 210 are respectively attached to one side of each of the electrode assemblies 100 along its own width direction, and the connection portions 220 are abutted against the side walls at both ends of each of the electrode assemblies 100 along its own length direction. The connection portions 220 of two adjacent side plate assemblies 200 are abutted against each other.

[0031] The single cell in this embodiment is formed into a long cell by connecting several electrode assemblies 100 end to end in series, and then using the side plate assembly 200 to be attached to the side walls of the electrode assembly 100 along its width direction, the side edge portion 210 of the side plate assembly 200 is attached to the side of the electrode assembly 100, and the connecting portion 220 of the side plate assembly 200 is set at both ends of the top assembly along its length direction, so that the connecting portions 220 of the side assemblies of two adjacent electrode assemblies 100 abut against each other, and the two adjacent electrode assemblies 100 are fixed, thereby improving the structural strength of the long cell. The single cell divides the internal cell into several electrode assemblies 100, which can reduce the length of a single electrode assembly 100, avoid surface wrinkles, deformation, layer crossover, fracture and other undesirable phenomena caused by the excessive length of the electrode assembly 100, and at the same time, the side plate assembly 200 protects the connected connecting tabs 110, thereby improving the safety of the single cell.

[0032] Specifically, in this embodiment, two electrode assemblies 100 are provided, and the connecting portion 220 and the side portion 210 of the side panel assembly 200 are perpendicular to each other to form an L-shape; when three or more electrode assemblies 100 are used, except for the outermost side panel assembly 200 which is L-shaped, the other internal side panel assemblies 200 include a side portion 210 and two connecting portions 220 arranged at both ends of the side portion 210, so that the side panel assembly 200 is in a L-shape, which will not be repeated here.

[0033] like Figure 1 and Figure 2 As shown, the above-mentioned single cell further includes two cover plates 400, which are arranged opposite to each other and connected one by one to the two outermost connecting tabs 110 of the plurality of electrode assemblies 100. The plurality of electrode assemblies 100 inside the single cell form a long cell structure, and only the two outermost connecting tabs 110 are provided with the cover plates 400. The internal electrode assemblies 100 are connected by welding the connecting tabs 110, which reduces the number of structural parts, can reduce production costs and reduce the internal resistance of the single cell.

[0034] Furthermore, the electrode assembly 100 is provided with support plates 500 at both ends along its length direction, and the support plates 500 are provided with support holes 510 for the connection tabs 110 to pass through. In this embodiment, only one of the two outermost electrode assemblies 100 is provided with a support plate 500, and the support plate 500 is located at one end close to the cover plate 400, so that in the process of pushing the long battery cell structure composed of several electrode assemblies 100 into the battery housing 300, the thrust is kept uniform, ensuring that the long battery cell structure is smoothly inserted into the housing, and improving the efficiency of inserting into the housing.

[0035] In this embodiment, both of the above-mentioned cover plates 400 are provided with first explosion-proof valves 410. The two first explosion-proof valves 410 perform explosion-proof pressure relief from both ends of the monomer battery in the length direction, improving the use safety of the monomer battery.

[0036] Further, the above-mentioned monomer battery further includes a battery case 300. The above-mentioned cover plates 400 are hermetically arranged at the openings at both ends of the above-mentioned battery case 300 in a one-to-one correspondence. A plurality of the above-mentioned electrode assemblies 100 are all arranged inside the above-mentioned battery case 300, and a plurality of second explosion-proof valves 310 are arranged on the outer wall of the above-mentioned battery case 300. In addition to using the first explosion-proof valve 410 for explosion-proof pressure relief, the second explosion-proof valves 310 arranged on the outer wall of the battery case 300 are also used for pressure relief. The gas generated by the electrode assemblies 100 can quickly gather in the middle part of the monomer battery, and then the second explosion-proof valves 310 perform pressure relief, improving the use safety.

[0037] As a preferred embodiment, the above-mentioned second explosion-proof valves 310 are arranged on the side walls at both ends of the above-mentioned battery case 300 along its own thickness direction, and the above-mentioned second explosion-proof valves 310 are located at the connection parts of two adjacent above-mentioned electrode assemblies 100. The explosion-proof valves are arranged at the connection parts of two electrode assemblies 100. The gas generated by the electrode assemblies 100 can quickly converge along the internal air duct surrounded by the above-mentioned side plate assemblies 200 to the connection part between the two electrode assemblies 100, and there are no other components blocking the gap at the connection part, which can increase the exhaust efficiency, shorten the air duct stroke, and further improve the safety of the monomer battery

[0038] When assembling the monomer battery in this embodiment, first, the side plate assembly 200 is attached to the side of the electrode assembly 100, and it can be attached by means of gluing or hot melting fixation. Subsequently, a plurality of electrode assemblies 100 are connected, so that the connection parts 220 of the side plate assembly 200 are abutted against each other to form a required long battery core structure. Subsequently, an insulating coating film 600 is coated on the outer surface of the long battery core structure. The coating film 600 is a commonly used Mylar film. Subsequently, the coated long battery core structure is pushed into the interior of the battery case 300 to complete the assembly of the monomer battery.

[0039] As Figure 2 shown, in this embodiment, two of the above-mentioned side plate assemblies 200 are attached to each of the above-mentioned electrode assemblies 100, and the two above-mentioned side plate assemblies 200 are oppositely arranged at both ends of the above-mentioned electrode assembly 100 along its own width direction. The two side plate assemblies 200 can surround each electrode assembly 100, so that an annular exhaust channel is formed between the electrode assembly 100 and the side plate assembly 200, facilitating the discharge of high-temperature and high-pressure gas from the electrode assembly 100 in thermal runaway.

[0040] Preferably, the above-mentioned side plate assembly 200 is integrally formed by an injection molding process, reducing the number of parts and simplifying the assembly process.

[0041] Optionally, between two relatively arranged side plate assemblies 200 as described above, there is an installation gap with a preset width between two relatively arranged connecting parts 220, and the dimension of the installation gap along the width direction of the electrode assembly 100 is not less than the dimension of the connecting tab 110 along the width direction of the electrode assembly 100. Since there is an installation gap with a preset width between two relatively arranged connecting parts 220, the two connecting parts 220 can protect the internal connecting tab 110, avoiding damage to the two welded connecting tabs 110 by external forces.

[0042] As Figure 3 shown, the two overlapping connecting tabs 110 are fixed by horizontal welding, which can simplify the process, further reduce the internal resistance, save the length of the connecting tab 110 to the greatest extent, reduce the space occupied by the connecting tab 110 inside the single cell, and improve the energy density of the single cell.

[0043] As Figure 4 and Figure 5 shown, the thickness of the side part 210 is L, and the thickness of the connecting part 220 is W, where 0.3 mm < L < 1 mm and 2.5 mm ≤ W ≤ 5 mm. The side plate assembly 200 arranged in this way can provide good support strength, and can also reduce the space occupied by the side plate assembly 200 as much as possible, improving the energy density of the single cell.

[0044] This embodiment also provides an electrical device, which includes a single cell as described in any of the above solutions. The electrical device can specifically be a battery pack, a pure electric vehicle, a hybrid electric vehicle, a ship, an energy storage device, etc., which will not be elaborated here. The electrical device is powered by the above single cell, thus having all the beneficial effects of the single cell described in any of the above solutions, which will not be elaborated here. Specifically, the single cell used in the electrical device can reduce the length of a single electrode assembly 100, avoiding adverse phenomena such as surface wrinkles, deformation, layer displacement, and fracture caused by the overlong electrode assembly 100. At the same time, the side plate assembly 200 protects the connected connecting tabs 110, improving the use safety of the electrical device.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A single cell, characterized in that, Comprising: A plurality of electrode assemblies, both ends of each electrode assembly in its own length direction are provided with connecting tabs, and the plurality of electrode assemblies are connected in series end to end in their own length directions, and the connecting tabs that are close to each other in two adjacent electrode assemblies are overlapped with each other; A plurality of side plate assemblies, each side plate assembly includes a side portion and a connecting portion, the side portions are respectively attached to one side of each electrode assembly in its own width direction, and the connecting portions abut against the side walls at both ends of each electrode assembly in its own length direction, and the connecting portions of two adjacent side plate assemblies abut against each other.

2. The single cell according to claim 1, wherein Two of the side plate assemblies are attached to each electrode assembly, and the two side plate assemblies are oppositely arranged at both ends of the electrode assembly in its own width direction.

3. The monomer battery according to claim 2, characterized in that, Between the two oppositely arranged connecting portions in the two oppositely arranged side plate assemblies, there is an installation gap with a preset width, and the dimension of the installation gap in the width direction of the electrode assembly is not less than the dimension of the connecting tab in the width direction of the electrode assembly.

4. The single cell according to claim 2, characterized in that The thickness of the side portion is L, and the thickness of the connecting portion is W, 0.3mm < L < 1mm, 2.5mm ≤ W ≤ 5mm.

5. The single cell according to claim 1, characterized in that, The single cell further includes two cover plates, and the two cover plates are oppositely arranged and are respectively connected to the two outermost connecting tabs in the plurality of electrode assemblies.

6. The single cell according to claim 5, wherein, Support plates are provided at both ends of the electrode assembly in its own length direction, and the support plates are provided with support holes for the connecting tabs to pass through.

7. The single cell according to claim 5, wherein Both of the two cover plates are provided with first explosion-proof valves.

8. The single cell according to claim 7, characterized in that The single cell further includes a battery case, the cover plates are respectively and sealingly arranged at the openings at both ends of the battery case, and the plurality of electrode assemblies are all arranged inside the battery case, and a plurality of second explosion-proof valves are arranged on the outer wall of the battery case.

9. The single cell according to claim 8, wherein, The second explosion-proof valves are arranged on the side walls at both ends of the battery case in its own thickness direction, and the second explosion-proof valves are located at the connection positions of two adjacent electrode assemblies.

10. Electrical equipment, characterized in that, Comprising the single cell according to any one of claims 1-9.

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