Convergence plate, single battery and electric equipment
By incorporating a central liquid outlet and etched grooves into the manifold, the safety risks associated with abnormal battery conditions are mitigated, enabling rapid battery depressurization and improved safety.
Patent Information
- Application Number
- CN202520269067.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-19
AI Technical Summary
Existing busbar designs may lead to uneven current distribution under conditions of battery overcharging, overheating, or abnormality, increasing safety risks and potentially obstructing the explosion-proof valve, causing the battery to explode or continue to burn.
Design a manifold comprising a central liquid outlet and circumferential grooves. The grooves have lower mechanical strength than the welded parts, enabling them to rupture during thermal runaway of a single cell, thus achieving rapid pressure relief. They also increase the contact area with the positive electrode tab of the winding core to improve current carrying capacity.
It improves battery safety and lifespan, reduces heat generation, and ensures rapid pressure relief in the event of thermal runaway, preventing heat diffusion.
Smart Images
Figure CN223598962U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a busbar, a single battery cell, and an electrical device. Background Technology
[0002] As a core component of electric vehicles, the power battery pack's internal busbar plays a crucial role. The busbar is typically welded to the positive electrode tab of the individual battery cell's core. It not only amplifies the weak current generated by each individual electrode in the core into a powerful electrical output, but also ensures a stable output of this energy to allow the individual battery cell to discharge. Its design quality is closely linked to the safety, reliability, and lifespan of the entire battery system. An improperly designed busbar can lead to uneven current distribution, causing battery overheating, damage, and even potentially serious consequences such as fires.
[0003] In the prior art, cylindrical batteries may experience a sharp increase in internal pressure under overcharging, overheating or other abnormal conditions, which increases safety risks. The design of the positive electrode busbar may block the explosion-proof valve, thereby preventing the normal ejection of the inner core of the cylindrical battery. This could lead to battery explosion or the residual inner core causing continuous battery combustion and heat diffusion.
[0004] Therefore, there is an urgent need to provide a new type of busbar, individual battery, and electrical equipment to solve the aforementioned technical problems in the prior art. Utility Model Content
[0005] One objective of this invention is to provide a busbar with a simple structure that can quickly detach from a single battery cell when thermal runaway occurs, which is beneficial for depressurization inside the single battery cell and improves safety in use.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] The busbar is used for a single battery cell and includes a busbar body and a busbar lead-out portion connected to each other. The busbar body has a central liquid discharge hole through it along its thickness direction. Multiple grooves are distributed circumferentially around the outer periphery of the central liquid discharge hole. A welding portion is formed between two adjacent grooves for welding to the tabs of the winding core. The mechanical strength of the busbar body at the grooves is less than the mechanical strength of the welding portion. The grooves are configured to be destroyed when the internal pressure of the single battery cell is released.
[0008] Optionally, the main body of the manifold is fan-shaped, and the main body of the manifold is coaxially arranged with the central liquid outlet.
[0009] Optionally, the aforementioned groove extends from the central liquid outlet toward the edge of the manifold body.
[0010] Optionally, the focal points of the extension lines of any two of the above-mentioned score grooves are located on the axis of the above-mentioned central downflow hole.
[0011] Optionally, the included angle between any two adjacent above-mentioned score grooves is 10° to 45°.
[0012] Optionally, the plurality of above-mentioned score grooves are uniformly spaced in the circumferential direction.
[0013] Optionally, the shape of the above-mentioned score groove is a straight line, an arc, a wave or a sawtooth shape.
[0014] Optionally, the radial component length of the above-mentioned score groove on the above-mentioned busbar body is X, the difference between the radius of the above-mentioned busbar body and the radius of the above-mentioned central downflow hole is Y, and 0.7Y≤X≤0.9Y.
[0015] Optionally, the depth of the above-mentioned score groove is 30% to 80% of the thickness of the above-mentioned busbar body.
[0016] Optionally, the end of the above-mentioned busbar lead-out portion away from the above-mentioned busbar body is provided with a circular chamfer portion.
[0017] Optionally, the above-mentioned score groove is provided on the first surface of the above-mentioned busbar body, and the above-mentioned busbar body further comprises a second surface opposite to the above-mentioned first surface, and the above-mentioned second surface is used for welding the tab of the core.
[0018] Another purpose of the utility model is to provide a single battery, which comprises the busbar as any one of the above-mentioned schemes.
[0019] Another purpose of the utility model is to provide a power consumption equipment, which comprises the single battery as the above-mentioned scheme.
[0020] Beneficial effects:
[0021] The busbar in the utility model is provided with necessary central downflow holes on the busbar body, so that the welding area between the busbar body and the core is larger, the contact area with the positive tab of the core can be effectively increased, the overcurrent area can be increased, the rate performance of the tab can be effectively improved, the overcurrent capacity of the battery can be improved, and the heat generation phenomenon can be reduced; meanwhile, a plurality of score grooves are arranged on the busbar body, the welding portion for welding with the positive tab of the core is formed between the two adjacent score grooves, the mechanical strength of the score groove is less than that of the welding portion, when the single battery appears thermal runaway, the busbar breaks at the score groove, so that the core can carry the welding portion and rush out of the single battery, which is beneficial to the pressure relief of the single battery and improves the use safety of the single battery. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1is the isometric view of the busbar provided by the embodiment of the utility model;
[0023] Figure 2 is the plan view of the busbar provided by the embodiment of the utility model.
[0024] In the drawing,
[0025] 10, busbar main body;11, center lower liquid hole;12, scale groove;13, welding part;101, first surface;102, second surface;20, busbar leading part;21, circular chamfer part. Embodiment
[0026] The utility model will be further explained in detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all the structures.
[0027] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0028] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0029] In the description of the embodiment, the terms "up", "down", "right", etc. The orientation or position relationship shown in the drawing is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.
[0030] Referring to Figure 1 In the embodiment, the busbar is used for a single battery, which comprises a busbar body 10 and a busbar lead-out portion 20 connected with each other; the busbar body 10 is provided with a central liquid downhole 11 penetrating through the thickness direction of the busbar body 10, and a plurality of score grooves 12 are distributed at intervals in the circumferential direction of the outer periphery of the central liquid downhole 11, and a welding portion 13 for welding with the positive tab of the winding core is formed between any two adjacent score grooves 12, and the mechanical strength of the busbar body 10 at the score groove 12 is less than that of the welding portion 13.
[0031] In the embodiment, the busbar is provided with the necessary central liquid downhole 11 on the busbar body 10, so that the welding area between the busbar body 10 and the winding core is larger, which can effectively increase the contact area with the positive tab of the winding core, increase the overcurrent area, effectively improve the rate performance of the tab, improve the overcurrent capacity of the battery, and at the same time reduce the generation of heat phenomenon; meanwhile, a plurality of score grooves 12 are arranged on the busbar body 10, and a welding portion 13 for welding with the positive tab of the winding core is formed between any two adjacent score grooves 12, and the mechanical strength of the score groove 12 is less than that of the welding portion 13, so that when the single battery appears thermal runaway, the busbar breaks at the score groove 12, so that the winding core can carry the welding portion 13 out of the single battery, which is beneficial to the pressure relief of the single battery and improves the safety of the single battery.
[0032] Further, the busbar body 10 is in the shape of a sector, and the busbar body 10 is coaxially arranged with the central liquid downhole 11. In the embodiment, the busbar body 10 is in the shape of a sector greater than 180°, which is used for connecting the positive tab of the winding core of the cylindrical battery, and also makes the shape of the busbar body 10 fit the shape of the internal space of the shell of the cylindrical battery, so that the central liquid downhole 11 is directly opposite to the center of the winding core, which facilitates the installation and welding of the busbar.
[0033] Specifically, the score groove 12 extends from the central liquid downhole 11 towards the edge of the busbar body 10. In the embodiment, the score groove 12 is radially arranged from the central liquid downhole 11 towards the edge, which can make the busbar break radially from the central liquid downhole 11 when the single battery appears thermal runaway, so as to facilitate the ejection of the winding core and facilitate the pressure relief of the single battery, and further improve the safety.
[0034] In the embodiment, the focal point of the extension line of any two score grooves 12 is located on the axis of the central liquid downhole 11. That is, each score groove 12 is arranged along the radial direction of the busbar body 10, which can reduce the processing difficulty of the score groove 12, improve the production efficiency and reduce the production cost.
[0035] Further, the included angle between any two adjacent above-mentioned notch grooves 12 is 10° to 45°. Exemplarily, the included angle between two adjacent notch grooves 12 is 10°, 15°, 20°, 30° or 45°, and the angles between two adjacent notch grooves 12 can be the same or different. In the embodiment, the included angle is preferably 15°, so as to ensure that there is enough welding portion 13 for welding, and the strength of the welding portion 13 is not affected, which will not be described here again.
[0036] It should be noted that the above-mentioned notch groove 12 is arranged on the first surface 101 of the busbar main body 10, and the busbar main body 10 further comprises a second surface 102 arranged opposite to the first surface 101, and the second surface 102 is used for welding the tab of the core. In the embodiment, the first surface 101 is provided with the notch groove 12, and the second surface 102 is used for welding the tab of the core, so as to avoid blocking or damaging the notch groove 12 when welding the core, which can facilitate the welding assembly of the core and the busbar, and improve the reliability of pressure relief when the notch groove 12 is broken.
[0037] Optionally, a plurality of above-mentioned notch grooves 12 are uniformly and circumferentially spaced. Specifically, the above-mentioned notch grooves 12 are uniformly distributed in 7 circumferential directions, and the included angle between any two adjacent notch grooves 12 is 15°, which will not be described here again. Thus, the processing difficulty of the notch groove 12 can be reduced, the production efficiency can be improved, and the production cost can be reduced.
[0038] Please continue to refer to Figure 2 The shape of the above-mentioned notch groove 12 is linear, arc-shaped, wavy or sawtooth-shaped. In the embodiment, the shape of the notch groove 12 is linear, which is the most convenient to process, and the mechanical strength of the formed notch groove 12 is lower, which is more easily broken and torn by gas when the single battery is in thermal runaway, which is beneficial to the discharge of the core and further improves the safety performance.
[0039] Optionally, the radial component length of the above-mentioned notch groove 12 on the above-mentioned busbar main body 10 is X, the difference between the radius of the above-mentioned busbar main body 10 and the radius of the above-mentioned center liquid outlet hole 11 is Y, and 0.7Y≤X≤0.9Y. In the embodiment, preferably, X=0.8Y. Such arrangement makes the length of the notch groove 12 not too short and the mechanical strength too high, and the mechanical strength too high will not break the busbar when thermal runaway, which will affect the pressure relief; and the length of the notch groove 12 is not too long and the mechanical strength is too small, and the mechanical strength too small will cause the deformation and breakage of the busbar during welding, which will not be described here again.
[0040] The depth of the aforementioned scribing groove 12 in the embodiment is 30% to 80% of the thickness of the aforementioned busbar main body 10. In the embodiment, the depth of the scribing groove 12 is 1 / 3 of the thickness of the busbar main body 10. If the depth of the scribing groove 12 is too large, the mechanical strength of the scribing groove 12 will be too small, which will cause deformation and rupture of the busbar during welding, and the welding quality and yield will be low. If the depth of the scribing groove 12 is too small, the mechanical strength at the scribing groove 12 will be too large, which will block the discharge of the winding core when the single battery is in thermal runaway, increasing the risk of further thermal diffusion of the single battery in thermal runaway, and is not conducive to improving the safety performance.
[0041] Further, the aforementioned busbar lead-out portion 20 is provided with a circular chamfer portion 21 at the end away from the aforementioned busbar main body 10. The provision of the circular chamfer portion 21 can avoid scratching the cap when the busbar lead-out portion 20 and the cap in the cover plate assembly of the single battery are connected by laser welding, and can further improve the welding quality.
[0042] Another purpose of the utility model is to provide a single battery, which comprises the busbar as in any of the above-mentioned solutions. The single battery can be a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, a polymer lithium-ion battery, etc. The single battery can also be a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, or a sodium-ion battery, or a magnesium-ion battery, etc. The above-mentioned solutions will not be repeated here. The single battery uses the busbar as in any of the above-mentioned solutions, thereby having all the beneficial effects of the busbar, and can timely discharge the winding core in thermal runaway, avoid the accumulation of heat causing the heat of the single battery to spread to the peripheral single battery, avoid thermal diffusion, and improve the safety of the single battery.
[0043] The embodiment further provides a power-consuming device, which comprises the winding battery as in the above-mentioned solutions. The power-consuming device can be a battery pack, an electric bicycle, an electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., as long as it uses electric energy as the energy source, which will not be repeated here.
[0044] Obviously, the above-mentioned embodiments of the utility model are only examples for clear illustration of the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled persons in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the utility model. It is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the utility model shall be included in the protection scope of the utility model claims.
Claims
1. A busbar for a unit cell, characterized by, The busbar includes a busbar body (10) and a busbar lead-out portion (20) connected to each other; the busbar body (10) is provided with a central liquid outlet hole (11) penetrating through the thickness direction of the busbar body (10); the outer periphery of the central liquid outlet hole (11) is circumferentially spaced with a plurality of score grooves (12); a welding portion (13) for welding with the tab of the core is formed between two adjacent score grooves (12); the mechanical strength of the busbar body (10) at the score groove (12) is less than that of the welding portion (13); and the score groove (12) is configured to be damaged when the single battery discharges internal pressure.
2. The busbar of claim 1, wherein The busbar body (10) is in a fan shape, and the busbar body (10) is coaxially arranged with the central liquid outlet hole (11).
3. The busbar of claim 2, wherein, The score groove (12) is arranged extending from the central liquid outlet hole (11) to the edge of the busbar body (10).
4. The busbar of claim 3, wherein The focal point of the extension line of any two score grooves (12) is located on the axis of the central liquid outlet hole (11).
5. The busbar of claim 4, wherein, The included angle between any two adjacent score grooves (12) is 10° to 45°.
6. The busbar of claim 5, wherein, A plurality of score grooves (12) are uniformly and circumferentially spaced.
7. The busbar of claim 3, wherein The score groove (12) is in a linear shape, an arc shape, a wave shape, or a zigzag shape.
8. The busbar of claim 7, wherein, The radial component length of the score groove (12) is X, the difference between the radius of the busbar body (10) and the radius of the central liquid outlet hole (11) is Y, and 0.7Y≤X≤0.9Y.
9. The busbar of any one of claims 1-8, wherein, The depth of the score groove (12) is 30% to 80% of the thickness of the busbar body (10).
10. The busbar of any one of claims 1-8, wherein, The busbar lead-out portion (20) is provided with a circular chamfer portion (21) at the end away from the busbar body (10).
11. The busbar of any one of claims 1-8, wherein, The score groove (12) is arranged on the first face (101) of the busbar body (10), and the busbar body (10) further includes a second face (102) arranged opposite to the first face (101), and the second face (102) is used for welding the tab of the core.
12. A battery cell, characterized by The busbar includes the busbar according to any one of claims 1-11.
13. An electrical device, characterized by The single battery includes the single battery according to claim 12.