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 fixed frame, a plurality of core package assemblies and a plurality of supporting assemblies, connecting tabs are arranged at the two ends of each core package assembly in the first direction, and the plurality of core package assemblies are connected in series end to end in the first direction; the fixed frame is annularly arranged on the periphery of the plurality of core cladding components and forms an accommodating cavity for accommodating the plurality of core cladding components; the supporting assembly is clamped between the two adjacent core package assemblies, the two ends, in the second direction, of the supporting assembly are fixed to the inner wall of the fixing frame, the supporting assembly is provided with a containing groove, and the connecting tabs, close to each other, in the two adjacent core package assemblies are in lap joint and arranged in the containing groove in a penetrating mode. 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 electrical equipment. Background Art

[0002] As lithium-ion battery technology matures, it is widely used as a power battery in electric vehicles and energy storage, leading to increasing demands for performance and safety. Lithium-ion cells are core components for safety and assembly, and their structural design is crucial to the safety of the entire pack.

[0003] Existing battery cell structures are generally short, and the overall capacity improvement space is limited by process conditions. Therefore, the battery cell structure is developing in the direction of longer cells. However, for longer cells, the electrode group often bends and deforms due to its strength issues, resulting in reduced product yield. If multiple short cells are directly connected in series to form a long cell, it will increase the structural cost and waste space. Currently, the molding process requirements for long cells and extra-long cells are high, and the internal support structure of the battery cell is difficult to manufacture. At the same time, the tabs of long cells are prone to overlap when bent, which provides insufficient protection. The tabs are connected with C-shaped or S-shaped bends, which makes the tabs longer and requires more space. On the other hand, due to the long length of the battery cell, when the battery cell experiences thermal runaway, the gas cannot be released quickly due to the long and obstructed path, which reduces the safety performance of the battery cell. In addition, the internal electrode group support of the battery cell is prone to imbalance, and the electrode group is easily damaged when it moves.

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

[0005] One purpose of the present utility model is to provide a single cell battery that can achieve good support inside a long cell structure and has higher structural strength, thereby improving the safety of the single cell battery.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] The single battery includes a fixed frame, a plurality of core package assemblies and a plurality of support assemblies. Both ends of the core package assemblies along the first direction are provided with connecting ears, and the plurality of core package assemblies are connected in series end to end along the first direction; the fixed frame is arranged around the outer periphery of the plurality of core package assemblies and forms an accommodating cavity for accommodating the plurality of core package assemblies; the support assembly is clamped between two adjacent core package assemblies, and both ends of the support assembly along the second direction are fixed to the inner wall of the fixed frame, and the support assembly is provided with an accommodating groove, and the connecting ears close to each other in the two adjacent core package assemblies overlap each other and are passed through the accommodating groove.

[0008] Optionally, the support assembly includes a support seat and a pressing plate, the support seat is provided with a mounting groove, and the overlapping connecting tabs are clamped between the pressing plate and the inner bottom wall of the mounting groove.

[0009] Optionally, the fixing frame is provided with fixing holes on two opposite side walls along the second direction, and the support seat is provided with fixing protrusions at both ends along the second direction, and the fixing protrusions are correspondingly inserted into the fixing holes.

[0010] Optionally, the dimension of the pressure plate along the second direction is equal to the dimension of the installation groove along the second direction, and a snap-fit groove is provided on the side wall of one end of the pressure plate facing the support seat, and the snap-fit groove and the inner bottom wall of the installation groove are arranged to form the accommodating groove.

[0011] Optionally, the pressing plate is fixed to the inner bottom wall of the receiving tank by bonding, hot-melt connection or solvent connection.

[0012] Optionally, the above-mentioned single cell battery also includes a battery shell and two cover bodies, the above-mentioned core pack assembly and the above-mentioned fixing frame are both arranged in the above-mentioned battery shell, and the above-mentioned battery shell is provided with opening structures at both ends along the above-mentioned first direction. The above-mentioned cover bodies are sealed and arranged in the above-mentioned opening structures one by one, and the above-mentioned cover bodies are integrally formed with a pole protrusion, and the above-mentioned connecting ears are correspondingly connected to the above-mentioned pole protrusion.

[0013] Optionally, at least one of the two end surfaces of the battery housing that are opposite to each other along the second direction is provided with an explosion-proof valve.

[0014] Optionally, a plurality of explosion-proof valves are provided, and each explosion-proof valve corresponds to one of the core pack components.

[0015] Optionally, both ends of the fixing frame along the first direction are provided with avoidance holes, and the connecting tabs located at the outermost ends along the first direction are passed through the avoidance holes in a one-to-one correspondence.

[0016] Another object of the present invention is to provide an electrical device, which specifically includes a single battery as described in any of the above solutions.

[0017] Beneficial effects:

[0018] The single cell battery of the present invention is formed by connecting a number of core package assemblies end to end in series to form a long battery cell structure, and then using a fixed frame to be arranged around the periphery of the core package assembly to surround and fix the core package assembly, thereby fixing two adjacent core package assemblies and improving the overall strength of the long battery cell structure. At the same time, a support assembly is provided between the two adjacent core package assemblies, and the support assembly is fixed to the inner wall of the fixed frame and is provided with a receiving groove. The two connecting tabs that overlap each other are accommodated in the above-mentioned receiving groove, so that the support assembly supports and fixes the two adjacent core package assemblies. The single cell battery divides the internal battery cell into a number of core package assemblies, which can reduce the length of a single core package assembly and avoid surface wrinkles, deformation, layer crossover, fracture and other undesirable phenomena caused by the excessive length of the core package assembly. At the same time, the fixed frame and the support assembly fix the connected core package assemblies, thereby improving the safety of the single cell battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an axonometric diagram of a long battery cell structure provided by a specific embodiment of the present utility model;

[0020] Figure 2 This is an axonometric diagram of the long battery cell structure provided by the specific embodiment of the utility model with some components hidden;

[0021] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0022] Figure 4 This is a diagram showing the assembly process of a support assembly according to a specific embodiment of the present invention;

[0023] Figure 5 It is a side view of a single cell provided in a specific embodiment of the present utility model.

[0024] In the picture:

[0025] 100, core package assembly; 110, connecting tabs;

[0026] 200, fixed frame; 201, accommodating cavity; 202, avoidance hole; 203, fixing hole;

[0027] 300, support assembly; 301, receiving groove; 310, support base; 311, mounting groove; 312, fixing protrusion; 320, pressing plate; 321, snap-fit groove;

[0028] 400, battery housing; 410, cover body; 411, pole protrusion; 420, explosion-proof valve. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0030] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0033] The first direction described in this embodiment is Figure 1 and Figure 5 The X direction shown in is the length direction of the single battery, and the second direction is Figure 1 and Figure 4 The Y direction shown in FIG, ie, the width direction of the single battery, the first direction and the second direction are perpendicular to each other.

[0034] Please refer to Figures 1 to 3In this embodiment, the single battery includes a fixing frame 200, a plurality of core package assemblies 100 and a plurality of support assemblies 300. Both ends of the core package assemblies 100 along the first direction are provided with connecting tabs 110, and the plurality of core package assemblies 100 are connected in series end to end along the first direction; the fixing frame 200 is arranged around the outer periphery of the plurality of core package assemblies 100 and forms an accommodating cavity 201 for accommodating the plurality of core package assemblies 100; the support assembly 300 is clamped between two adjacent core package assemblies 100, and both ends of the support assembly 300 along the second direction are fixed to the inner wall of the fixing frame 200, and the support assembly 300 is provided with an accommodating groove 301, and the connecting tabs 110 close to each other in the two adjacent core package assemblies 100 overlap with each other and are passed through the accommodating groove 301.

[0035] The single cell battery in this embodiment is formed into a long battery cell structure by connecting several core package assemblies 100 end to end in series, and then using a fixing frame 200 to be arranged around the outer periphery of the core package assembly 100 to surround and fix the core package assembly 100, thereby achieving the fixation of two adjacent core package assemblies 100 and improving the overall strength of the long battery cell structure. At the same time, a support assembly 300 is arranged between the two adjacent core package assemblies 100, and the support assembly 300 is fixed to the inner wall of the fixing frame 200 and the support assembly 300 is provided with a receiving groove 301. The two overlapping connecting ears 110 are accommodated in the above-mentioned receiving groove 301, so that the support assembly 300 supports and fixes the two adjacent core package assemblies 100. The single cell battery divides the internal battery cells into several core package assemblies 100, which can reduce the length of a single core package assembly 100 and avoid adverse phenomena such as surface wrinkles, deformation, layer penetration, and breakage caused by the core package assembly 100 being too long. At the same time, the fixed frame 200 and the support assembly 300 fix the connected core package assemblies 100, thereby improving the safety of the single cell battery.

[0036] Preferably, the fixing frame 200 is integrally formed by injection molding, which reduces the number of parts and simplifies the assembly process.

[0037] Specifically, the two overlapping connecting tabs 110 are fixed by horizontal welding, which can simplify the process, further reduce the internal resistance, and save the length of the connecting tabs 110, reduce the space occupied by the connecting tabs 110 inside the single cell, and improve the energy density of the single cell.

[0038] like Figure 3 and Figure 4As shown, optionally, the support assembly 300 includes a support base 310 and a pressing plate 320. The support base 310 is provided with a mounting groove 311, and the overlapping connecting tabs 110 are clamped between the pressing plate 320 and the inner bottom wall of the mounting groove 311. By dividing the support assembly 300 into the support base 310 and the pressing plate 320, and using the pressing plate 320 to fix the connecting tab 110 in the mounting groove 311 of the support base 310, the fixing and support of the connecting tab 110 can be achieved, further improving the overall strength of the long battery cell structure.

[0039] Furthermore, the fixing frame 200 is provided with fixing holes 203 on two opposing walls along the second direction, and the support base 310 is provided with fixing protrusions 312 at both ends along the second direction. The fixing protrusions 312 are correspondingly inserted into the fixing holes 203. In this way, the support base 310 can be fixed and positioned within the fixing frame 200, preventing the support base 310 from loosening during transportation and improving the stability and reliability of the connection.

[0040] Optionally, the dimension of the pressing plate 320 along the second direction is equal to the dimension of the mounting groove 311 along the second direction. A snap-fit groove 321 is formed on the side wall of one end of the pressing plate 320 facing the support seat 310. The snap-fit groove 321 and the inner bottom wall of the mounting groove 311 form the receiving groove 301. This arrangement enables the pressing plate 320 to be reliably fixed inside the mounting groove 311, so that the snap-fit groove 321 of the pressing plate 320 and the mounting groove 311 form the required receiving groove 301, thereby achieving good support and fixation for the connecting tab 110.

[0041] In this embodiment, the pressing plate 320 is fixed to the inner bottom wall of the receiving tank 301 by bonding, hot melt bonding, or solvent bonding. It should be noted that in this embodiment, the pressing plate 320 and the support base 310 are both made of plastic. Bonding is the use of an adhesive to secure the two together through adhesion, hot melt bonding is the process of melting two objects and then solidifying them together, and solvent bonding is the use of a solvent to dissolve the surfaces of the two objects, causing the materials between the surfaces to mix and then secure them. Those skilled in the art can select a connection method based on their specific needs, and this will not be discussed in detail here.

[0042] like Figure 1 and Figure 5As shown, the above-mentioned single cell battery also includes a battery shell 400 and two cover bodies 410. The above-mentioned core pack assembly 100 and the above-mentioned fixing frame 200 are both arranged in the above-mentioned battery shell 400. The above-mentioned battery shell 400 is provided with an opening structure at both ends along the above-mentioned first direction. The above-mentioned cover bodies 410 are sealed and arranged in the opening structures one by one. The above-mentioned cover body 410 is integrally formed with a pole protrusion 411, and the above-mentioned connecting tab 110 is correspondingly connected to the above-mentioned pole protrusion 411. After several core pack assemblies 100 and fixing frames 200 are fixed to form a long battery cell structure, they can be pushed into the interior of the battery shell 400 through the opening structure. The opening structure is then sealed using the cover body 410 to complete the assembly of the single cell. Specifically, the cover in this embodiment is a structure in which the cover body 410 is integrally formed with the pole protrusion 411, which can simplify the structure of the cover, improve the space utilization rate of the battery cell, and improve the energy density.

[0043] In this embodiment, at least one of the two end surfaces of the battery housing 400 that are opposite each other along the second direction is provided with an explosion-proof valve 420. In this embodiment, the explosion-proof valve 420 is provided on the two end surfaces of the battery housing 400 that are opposite each other along the second direction, rather than on the cover plate body 410. This simplifies the structure of the cover plate body 410, reduces the number of structural components, reduces production costs, and reduces the internal resistance of the long battery cell structure.

[0044] Furthermore, a plurality of explosion-proof valves 420 are provided, and each explosion-proof valve 420 is provided corresponding to one of the core pack assemblies 100. In this embodiment, the explosion-proof valves 420 can be provided simultaneously on the same end face of the battery housing 400, or separately on different end faces. Specifically, in this embodiment, two core pack assemblies 100 are provided, that is, two explosion-proof valves 420 are provided correspondingly. The two explosion-proof valves 420 are provided at intervals on one of the two end faces of the battery housing 400 that are oppositely arranged along the second direction, thereby realizing corresponding explosion-proof pressure relief for each core pack 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 the battery.

[0045] It should be noted that the support base 310 insulates and separates the two adjacent core package assemblies 100, so that each core package assembly 100 is accommodated in different chambers separated by the fixed frame 200 and the support base 310. Each core package assembly 100 can correspond to an annular exhaust channel. When the core package assembly 100 has thermal runaway, it can quickly release pressure and exhaust from the corresponding annular exhaust channel, and release pressure from the corresponding explosion-proof valve 420. The pressure relief and exhaust effect is better, which can improve the safety of the single cell.

[0046] Optionally, the outer walls of several of the core package assemblies 100 are covered with an insulating film, and the insulating film is sandwiched between the battery shell 400 and the outer wall of the core package assembly 100. When assembling the single battery in this embodiment, the multiple core package assemblies 100 are first connected end to end, and then the fixing frame 200 is fixed to the sides of the multiple core package assemblies 100 by gluing or hot-melt fixing to form the required long battery cell structure. The outer surface of the long battery cell structure is then covered with an insulating film. The insulating film is slit at the position of the explosion-proof valve 420 to facilitate pressure relief and exhaust. The insulating film is a commonly used Mylar film. The covered long battery cell structure is then pushed into the interior of the battery shell 400 and the cover body 410 is installed to complete the assembly of the single battery.

[0047] Optionally, both ends of the fixing frame 200 along the first direction are provided with avoidance holes 202, and the connecting tabs 110 located at the outermost ends along the first direction are correspondingly passed through the avoidance holes 202. The avoidance holes 202 not only enable the connecting tabs 110 of the core package assembly 100 to pass through the fixing frame 200 and connect with the cover body 410, thereby supporting the connecting tabs 110, but also shorten the length of the connecting tabs 110, thereby reducing production costs.

[0048] In this embodiment, the wall thickness of the fixing frame 200 is L, and the thickness of the insulating film is T; 1.5 mm < L < 3 mm, 0.1 mm < T < 0.2 mm. Those skilled in the art can select the values of the above parameters according to specific needs, and will not be repeated here.

[0049] Another object of the present invention is to provide an electrical device, which specifically includes a single cell as described in any of the above schemes. The electrical device can be a battery pack, a pure electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., which will not be described in detail here. The electrical device uses the above-mentioned single cell for power supply, so that it has all the beneficial effects of the single cell described in any of the above schemes, which will not be described in detail here. Specifically, the single cell used in the electrical device can reduce the length of a single core package assembly 100, avoiding surface wrinkles, deformation, layer crossover, fractures and other adverse phenomena caused by the core package assembly 100 being too long, and at the same time, the fixed frame 200 protects the core package assembly 100 connected end to end, thereby improving the safety of the electrical device.

[0050] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A single cell battery, characterized in that: include: A plurality of core package assemblies, each of which is provided with a connecting tab at both ends along a first direction, and the plurality of core package assemblies are connected in series end to end along the first direction; A fixed frame, the fixed frame being arranged around the outer periphery of the plurality of core package assemblies and forming an accommodating cavity for accommodating the plurality of core package assemblies; A support assembly is clamped between two adjacent core package assemblies, and both ends of the support assembly along the second direction are fixed to the inner wall of the fixed frame. The support assembly is provided with a receiving groove, and the connecting ears close to each other in the two adjacent core package assemblies overlap each other and are passed through the receiving groove.

2. The single cell according to claim 1, characterized in that: The support assembly includes a support seat and a pressing plate. The support seat is provided with a mounting groove. The overlapping connecting tabs are clamped between the pressing plate and the inner bottom wall of the mounting groove.

3. The single cell according to claim 2, characterized in that: The fixing frame is provided with fixing holes on two opposite side walls along the second direction, and the support seat is provided with fixing protrusions at both ends along the second direction. The fixing protrusions are correspondingly inserted into the fixing holes.

4. The single cell according to claim 2, characterized in that: The dimension of the pressure plate along the second direction is equal to the dimension of the installation groove along the second direction. A clamping groove is provided on one side wall of the pressure plate facing the support seat. The clamping groove and the inner bottom wall of the installation groove form the accommodating groove.

5. The single cell according to claim 4, characterized in that: The pressing plate is fixed to the inner bottom wall of the containing tank by bonding, hot-melt connection or solvent connection.

6. The single cell according to claim 1, characterized in that: The single cell battery also includes a battery shell and two cover bodies. The core pack assembly and the fixing frame are both arranged in the battery shell. The battery shell is provided with opening structures at both ends along the first direction. The cover bodies are sealed and arranged in a one-to-one correspondence with the opening structures. The cover body is integrally formed with a pole protrusion, and the connecting tab is correspondingly connected to the pole protrusion.

7. The single cell according to claim 6, characterized in that: At least one of the two end surfaces of the battery housing that are opposite to each other along the second direction is provided with an explosion-proof valve.

8. The single cell according to claim 7, characterized in that: There are multiple explosion-proof valves, and each explosion-proof valve is corresponding to one core package assembly.

9. The single cell according to any one of claims 1 to 8, characterized in that: Both ends of the fixing frame along the first direction are provided with avoidance holes, and the connecting tabs located at the outermost ends along the first direction are passed through the avoidance holes in a one-to-one correspondence.

10. Electrical equipment, characterized in that: The invention comprises a single cell according to any one of claims 1 to 9.

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