Novel high-integration cylindrical battery structure

Abstract

The invention discloses a novel high-integration cylindrical battery structure, and relates to the technical field of new energy batteries, the novel high-integration cylindrical battery structure comprises a naked battery cell, the battery structure also comprises a negative pole post, the negative pole post is welded at the top end of the naked battery cell, a boss is fixedly mounted at the top end of the negative pole post, and four pole post slots are annularly formed in the negative pole post at equal intervals; the negative pole lug is welded at the top of the negative pole post, and the negative pole lug is arranged on the boss in a sleeving manner; the insulation lower plastic cement is installed at the top of the negative pole lug, and a first sleeve hole is formed in the insulation lower plastic cement, a conductive handle in the middle of a traditional Z-shaped current collecting plate and a bending process are omitted through a simple structure, the current conduction path from the negative pole lug to the pole column is shortened, the internal resistance is reduced, and the fast charging performance is improved; the connection reliability is enhanced through the design of multiple welding spots and the like; the design of an anti-explosion valve guarantees safety; the material of the pole is selectable, various requirements are met, the structural integrity is enhanced, and the assembly process is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy battery, and particularly relates to a novel high-integration cylindrical battery structure. BACKGROUND

[0002] At present, cylindrical batteries are getting larger and larger, and the internal space of the battery cell is getting more and more limited. The traditional current collector is a Z-shaped current collector structure, one end of which is welded with a tab, and the other end is welded with a pole. The two ends are connected by a conductive handle in the middle. On the one hand, the conductive handle needs to be bent once or twice to complete the assembly and the shell to realize the shell process. On the other hand, it increases the current path from the tab to the pole, so that the internal resistance of the current cylindrical battery on the market is generally high.

[0003] In summary, the existing large cylindrical battery has high internal resistance, which affects the fast charging performance of the battery. Therefore, a novel high-integration cylindrical battery structure is proposed to solve the above problems. SUMMARY

[0004] The present application aims to provide a novel high-integration cylindrical battery structure to solve the problem of high internal resistance of the existing large cylindrical battery, which affects the fast charging performance of the battery.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a novel high-integration cylindrical battery structure, comprising a bare cell. The battery structure further comprises: A negative pole is welded at the top end of the bare cell. A boss is fixedly installed at the top end of the negative pole. Four pole slots are arranged on the negative pole in a ring shape and at equal intervals. A negative tab is welded at the top of the negative pole. The negative tab is sleeved on the boss. An insulating lower plastic is installed at the top of the negative tab. A first sleeve hole is formed in the insulating lower plastic. The top end of the boss penetrates through the first sleeve hole and cooperates with the first sleeve hole. A cover plate is in contact with the insulating lower plastic at the bottom. A second sleeve hole is formed in the cover plate. The top end of the boss penetrates through the second sleeve hole and cooperates with the second sleeve hole. The bottom of the cover plate is welded with the negative pole. A rubber dispersion piece is arranged at the top end of the cover plate. The rubber dispersion piece is fixedly installed with the top end of the boss. By directly welding the negative pole post on the top end of the bare battery cell, and setting the negative pole post with a boss, the negative pole tab is directly sleeved on the boss and welded with the top of the negative pole post, which eliminates the intermediate conductive handle structure and bending process of the traditional Z-shaped current collector, shortens the current conduction path from the negative pole tab to the negative pole post, thereby effectively reducing the internal resistance of the battery and improving the fast charging performance of the battery, and meanwhile, the structure is matched with the boss through the first sleeve hole and the second sleeve hole on the insulating lower plastic and the cover plate, and the compact integration and stable connection between the negative pole post, the negative pole tab and the cover plate assembly are realized by directly welding the cover plate with the negative pole post and fixing the encapsulated parts, the overall structure is enhanced, and the assembly process is simplified.

[0006] Preferably, the insulating lower plastic is provided with a first explosion-proof valve mounting hole, and the cover plate is provided with a second explosion-proof valve mounting hole, which provides a precise positioning basis for the installation of the explosion-proof valve, ensures that the explosion-proof valve can be reliably embedded in the top structure of the battery, and the design of the double-component hole makes the integration of the explosion-proof safety mechanism in the battery more smooth and accurate, avoids the problems of poor sealing or functional failure caused by installation misalignment, and improves the safety protection capability of the battery.

[0007] Preferably, the first explosion-proof valve mounting hole and the second explosion-proof valve mounting hole are internally provided with the same explosion-proof valve, which realizes the double positioning and fixing of the explosion-proof valve in the top cover area of the battery, enhances the stability of the installation and the reliability of the sealing, and the installation mode makes the explosion-proof valve become a key component connecting the insulating lower plastic and the cover plate, which helps to improve the integration degree of the top assembly, when the internal pressure of the battery is abnormal, the explosion-proof valve can quickly respond and act through the two precisely aligned mounting holes, ensure the smoothness of the pressure relief channel, effectively guarantee the safety of the battery, and the integrated design also reduces the additional fixing parts and simplifies the top assembly process.

[0008] Preferably, the shape of the slot in the negative pole is not limited to an oval shape, and can be square, circular, triangular, etc. The slot in the negative pole can be designed in various shapes such as oval, square, circular, or triangular, which gives greater flexibility and adaptability to the structural design. These slots can effectively reduce the weight of the negative pole and save materials while ensuring the structural strength of the negative pole. The presence of the slot increases the contact area between the negative pole and the internal environment of the battery, such as the electrolyte, which may be beneficial for heat dissipation or infiltration. The various slot shapes also provide the possibility of optimizing the current distribution on the negative pole, which helps to further reduce the contact resistance and improve the uniformity of the current. In addition, this design allows the selection of the most suitable slot shape according to different battery models or performance requirements, enhancing the versatility and customizability of the battery structure.

[0009] Preferably, the top of the negative pole is provided with four welding marks, and the four welding marks are welded to the bottom of the negative tab. The multiple welding points significantly increase the welding area and the number of connection points between the negative tab and the negative pole, thereby greatly improving the mechanical connection strength and electrical connection reliability between the two. The multiple welding marks make the welding stress distribution more uniform, reducing the risk of connection failure due to single-point welding stress concentration and enhancing the stability of the battery in a vibrating or impacting environment. Meanwhile, more welding contact points mean lower contact resistance and better overcurrent capacity, which further helps to reduce the overall internal resistance of the battery and supports more efficient energy transmission.

[0010] Preferably, the welding marks are rectangular, and the shape and number of welding marks are not limited. The shape of the welding mark can be rectangular, and the number of welding marks can be flexibly set between 1 and 10. This provides a high degree of adjustability and optimization space for the process design of the battery. By adjusting the number and specific shape of the welding marks, the welding heat input, welding strength, and conductivity can be precisely controlled to adapt to battery products of different specifications or power requirements. Fewer welding marks can simplify the welding process and improve production efficiency, while more welding marks can maximize connection reliability and conductivity. This flexibility allows manufacturers to find the best balance between cost, performance, and production efficiency, making the battery structure more widely applicable to various scenarios.

[0011] Preferably, the material of the cover plate is aluminum. The aluminum material is selected to manufacture the cover plate, which fully utilizes the advantages of light weight, good electrical conductivity and relatively low cost of aluminum. The aluminum cover plate helps to reduce the overall weight of the battery, which is positive for improving the energy density of the battery. At the same time, the good electrical conductivity of aluminum makes the cover plate itself part of the current path, forming a good electrical connection with the negative pole post directly welded thereon, further optimizing the top current transmission path. The aluminum material is also easy to process and form and perform surface treatment, which is beneficial to the precise manufacturing of the second set of holes, the second explosion-proof valve mounting hole and other structures on the cover plate, and the reliable combination with the encapsulated parts and other components.

[0012] Preferably, the material of the negative pole post can be a negative pure copper pole post or a stainless steel pole post. The material of the negative pole post is selected to be a negative pure copper pole post or a stainless steel pole post, which provides a solution for different performance focuses. The pure copper pole post has excellent electrical conductivity, which can minimize the resistance of the pole post itself, and is ideal for battery applications that pursue extremely low internal resistance and high power output. The stainless steel pole post may have advantages in mechanical strength, corrosion resistance and cost control, and is suitable for applications with higher requirements for durability or cost sensitivity. This material selectivity enhances the adaptability of the battery structure design, enabling it to meet diverse market and product demands and expanding the application range.

[0013] The beneficial effects of the present application are: 1. The traditional current collector plate as an intermediate carrier is completely cancelled, connecting the pole post and the tab, and the pole post and the tab are directly connected, which greatly reduces the battery internal resistance under the premise of shortening the current path, realizes the battery electrical connection scheme, and meets the high fast charging demand; 2. Compared with the current collector plate with a conductive handle, the conductive handle is cancelled, and the current collector plate is integrally formed, saving two bending processes and two welding processes, greatly reducing the BOM and process cost; The present application eliminates the intermediate conductive handle of the traditional Z-shaped current collector plate and the bending process through a simple structure, shortens the current conduction path from the negative tab to the pole post, reduces the internal resistance, and improves the fast charging performance. The multiple welding points and other designs enhance the connection reliability. The explosion-proof valve design ensures safety. The pole post material is optional, meeting various needs, and also enhancing the overall structure of the structure, simplifying the assembly process. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a three-dimensional front view of the structure of the embodiment of the present application; Figure 2 is a three-dimensional exploded view of the structure of the embodiment of the present application; Figure 3 is a structure main sectional view of the bare cell, negative pole post, insulating lower plastic, cover plate, encapsulated part and explosion-proof valve of the embodiment of the present application; Figure 4The structure top view of the bare battery cell, negative pole, pole slot and welding mark of the embodiment of the application; Figure 5 The structure three-dimensional view of the negative pole, pole slot, welding mark and negative tab of the embodiment of the application.

[0015] In the figure: 1, bare battery cell; 2, negative pole; 3, pole slot; 4, welding mark; 5, insulating lower plastic; 6, first sleeve hole; 7, first anti-explosion valve mounting hole; 8, cover plate; 9, second sleeve hole; 10, second anti-explosion valve mounting hole; 11, encapsulated scattering part; 12, anti-explosion valve; 13, negative tab; 14, boss. DETAILED DESCRIPTION

[0016] The application will be further described below in combination with specific embodiments.

[0017] Reference Figures 1-5 In the embodiment, a new high-integration cylindrical battery structure is provided, which comprises a bare battery cell 1 and a negative pole 2 directly welded at the top end of the bare battery cell 1. The negative pole 2 is fixedly installed with a boss 14 at the top end, and four pole slots 3 are arranged at equal intervals in a ring shape on the negative pole 2. The pole slots 3 can be in the shape of an ellipse, a square, a circle or a triangle. When the pole slots 3 are in the shape of an ellipse, the weight of the negative pole 2 can be effectively reduced and the material can be saved under the premise of ensuring the structural strength of the negative pole 2, and the contact area between the negative pole 2 and the electrolyte inside the battery is increased, which is beneficial to heat dissipation or infiltration, and also provides the possibility for optimizing the current distribution on the negative pole 2, which helps to reduce the contact resistance and improve the uniformity of conduction. If other shapes such as square, circle or triangle are selected, the above-mentioned part of the effect can also be achieved, and the most suitable slot shape can be selected according to different battery models or performance requirements, thereby enhancing the universality and customizability of the battery structure.

[0018] The negative tab 13 is welded at the top of the negative pole 2 and is sleeved on the boss 14. Four rectangular welding marks 4 are arranged at the top of the negative pole 2, and the four welding marks 4 are all welded with the bottom of the negative tab 13. This multi-welding point layout increases the welding area and the number of connection points between the negative tab 13 and the negative pole 2, greatly improves the mechanical connection strength and electrical connection reliability between the two. The multiple welding marks 4 make the welding stress distribution more uniform, reduce the risk of connection failure caused by single-point welding stress concentration, and enhance the stability of the battery in a vibration or impact environment. At the same time, more welding contact points mean lower contact resistance and better overcurrent capacity, further reducing the overall internal resistance of the battery and supporting higher energy transmission efficiency. The number of welding marks 4 is not limited to four, and can be flexibly set between 1 and 10. By adjusting the number and shape of the welding marks 4, the welding heat input, welding strength and conduction performance can be accurately controlled to adapt to battery products of different specifications or power requirements.

[0019] The insulating under-plastic 5 is installed on the top of the negative tab 13, and a first sleeve hole 6 and a first explosion-proof valve mounting hole 7 are formed on the insulating under-plastic 5. The top end of the boss 14 penetrates through the first sleeve hole 6 and cooperates with the first sleeve hole 6. The cover plate 8 is made of aluminum, and the bottom of the cover plate 8 is in contact with the insulating under-plastic 5. A second sleeve hole 9 and a second explosion-proof valve mounting hole 10 are formed on the cover plate 8. The top end of the boss 14 penetrates through the second sleeve hole 9 and cooperates with the second sleeve hole 9, and the bottom of the cover plate 8 is welded with the negative pole 2. The cover plate 8 is made of aluminum, which has the advantages of light weight, good electrical conductivity and relatively low cost, thereby reducing the overall weight of the battery and improving the energy density of the battery. The good electrical conductivity of aluminum makes the cover plate 8 part of the current path, and forms a good electrical connection with the negative pole 2 directly welded thereon, thereby optimizing the top current transmission path. Aluminum material is easy to process and surface treatment, which is beneficial to the precise manufacturing of the second sleeve hole 9, the second explosion-proof valve mounting hole 10 and other structures on the cover plate 8, and the reliable combination with the encapsulated scattered parts 11 and other components.

[0020] The encapsulated scattered parts 11 are arranged on the top end of the cover plate 8, and the encapsulated scattered parts 11 are fixedly installed on the top end of the boss 14. The same explosion-proof valve 12 is installed in the first explosion-proof valve mounting hole 7 and the second explosion-proof valve mounting hole 10. The first explosion-proof valve mounting hole 7 is arranged on the insulating under-plastic 5, and the second explosion-proof valve mounting hole 10 is formed on the cover plate 8, thereby providing a precise alignment positioning basis for the installation of the explosion-proof valve 12, and ensuring that the explosion-proof valve 12 can be reliably embedded in the top structure of the battery. This double-component hole design makes the explosion-proof safety mechanism more smoothly and accurately integrated in the battery, avoids the problems of poor sealing or functional failure caused by installation misalignment, and improves the safety protection capability of the battery. At the same time, this design makes the installation of the explosion-proof valve 12 independent of the arrangement of other structures in the battery, such as the negative pole 2, and does not interfere with each other, which is beneficial to the parallel layout of multiple functional modules in a compact space. By installing the same explosion-proof valve 12 in the first explosion-proof valve mounting hole 7 and the second explosion-proof valve mounting hole 10, the explosion-proof valve 12 is doubly positioned and fixed in the top cover area of the battery, thereby enhancing the installation stability and sealing reliability of the explosion-proof valve 12. The explosion-proof valve 12 is a key component connecting the insulating under-plastic 5 and the cover plate 8, which helps to improve the integration level of the top assembly. When the internal pressure of the battery is abnormal, the explosion-proof valve 12 can quickly respond and act through the two precisely aligned mounting holes, thereby ensuring the smoothness of the pressure relief channel and effectively protecting the safety of the battery. This integrated design also reduces additional fixed parts and simplifies the top assembly process.

[0021] The negative pole 2 can be made of a negative pure copper pole or a stainless steel pole. The pure copper pole has excellent electrical conductivity, which can minimize the resistance of the pole itself, and is an ideal choice for battery applications that pursue extremely low internal resistance and high power output. The stainless steel pole has advantages in mechanical strength, corrosion resistance and cost control, and is suitable for applications that have higher requirements for durability or are cost-sensitive. This material selection enhances the adaptability of the battery structure design, meets the diversified market and product demands, and widens the application range.

[0022] The new high-integration cylindrical battery structure, through the above specific embodiments, omits the middle conductive handle structure and the bending process of the traditional Z-shaped current collector, shortens the current conduction path from the negative electrode tab 13 to the negative electrode pole 2, effectively reduces the battery internal resistance, and improves the battery fast charging performance. At the same time, through the cooperation of the first sleeve hole 6 and the second sleeve hole 9 on the insulating lower plastic 5 and the cover plate 8 with the boss 14, combined with the direct welding of the cover plate 8 and the negative electrode pole 2 and the fixation of the encapsulated scattered parts 11, the compact integration and stable connection between the negative electrode pole 2, the negative electrode tab 13 and the cover plate 8 assembly are realized, the overall structure is enhanced, and the assembly process is simplified.

[0023] Working principle: In use, the current flows from the bare cell 1, through the negative pole 2 welded at the top of the bare cell 1. The pole slot 3 (which can be any shape and size, such as oval, square, round, or triangular) is opened on the negative pole 2. When it is oval, it reduces weight, saves materials, increases contact area with the electrolyte inside the battery, helps heat dissipation or infiltration, optimizes current distribution, reduces contact resistance, and improves uniformity of electrical conductivity under the premise of ensuring structural strength. Other shapes can also achieve some of these effects, and can be selected according to the battery model or performance requirements to enhance versatility and customizability. The current is conducted to the negative tab 13 through the multiple rectangular solder marks 4 (the number can be flexibly set between 1 and 10) welded at the top of the negative pole 2 and the bottom of the negative tab 13. The multi-solder point layout increases the soldering area and the number of connection points, improves the mechanical connection strength and electrical connection reliability, makes the soldering stress distribution uniform, reduces the risk of connection failure, enhances the stability of the battery in a vibrating or impacting environment, reduces the contact resistance, improves the current-carrying capacity, reduces the overall internal resistance of the battery, and supports efficient energy transmission. The current is conducted to the top of the insulating lower plastic 5 through the negative tab 13. The first sleeve hole 6 on the insulating lower plastic 5 cooperates with the boss 14 at the top of the negative pole 2, and the current is conducted through the cover plate 8 (made of aluminum to reduce the overall weight of the battery, improve the energy density, become part of the current path, optimize the top current transmission path, and be easy to process and surface treatment, which is beneficial to precision manufacturing and reliable combination) fixedly installed at the top of the boss 14. The encapsulated dispersion piece 11 set at the top of the cover plate 8 is fixed with the top of the boss 14, which plays a fixing role. When the internal pressure of the battery is abnormal, the same explosion-proof valve 12 installed in the first explosion-proof valve mounting hole 7 of the insulating lower plastic 5 and the second explosion-proof valve mounting hole 10 of the cover plate 8 responds quickly and acts, ensuring that the pressure relief channel is unobstructed and ensuring the safety of the battery in use. The negative pole 2 can be made of negative pure copper pole or stainless steel pole. The pure copper pole has excellent electrical conductivity, reduces the resistance of the pole itself, and is suitable for applications that pursue extremely low internal resistance and high power output. The stainless steel pole has advantages in mechanical strength, corrosion resistance, and cost control, and is suitable for occasions with higher requirements for durability or cost sensitivity. The material selection meets the diversified market and product demand, and widens the application range. This structure eliminates the middle conductive handle structure and bending process of the traditional Z-type current collector, shortens the current conduction path from the negative tab 13 to the negative pole 2, reduces the internal resistance of the battery, improves the fast charging performance, and realizes the compact integration and stable connection between the negative pole 2, the negative tab 13, and the cover plate 8 assembly, enhances the structural integrity, and simplifies the assembly process.

[0024] It should be understood that any reference to or discussion of a particular apparatus, method, or device in the foregoing does not necessarily mean that the same is required to practice the application. Moreover, such apparatus, methods, or devices need not be explicitly described in the written description above in order to be within the scope of the application. Indeed, the application is intended to encompass all known and obvious alternatives, modifications, equivalents, and improvements thereto. It is intended that the application be construed as including all such alternatives, modifications, equivalents, and improvements as fall within the scope of the appended claims.

[0025] Finally, it should be noted that the foregoing merely represents a detailed description of the application and that changes and modifications can be suggestions to the application by those skilled in the art without departing from the spirit or scope of the application.

Claims

1. A novel highly integrated cylindrical battery structure, comprising bare cells (1), characterized in that, The battery structure also includes: The negative electrode post (2) is welded to the top of the bare cell (1). A boss (14) is fixedly installed on the top of the negative electrode post (2). Four electrode slots (3) are opened in a ring at equal intervals on the negative electrode post (2). Negative electrode tab (13), the negative electrode tab (13) is welded to the top of the negative electrode post (2), and the negative electrode tab (13) is sleeved on the boss (14); The insulating lower plastic (5) is installed on the top of the negative electrode tab (13), and the insulating lower plastic (5) has a first set hole (6) opened on it. The top of the boss (14) passes through the first set hole (6) and cooperates with the first set hole (6). The cover plate (8) has its bottom in contact with the insulating plastic (5). The cover plate (8) has a second hole (9). The top of the boss (14) passes through the second hole (9) and is engaged with the second hole (9). The bottom of the cover plate (8) is welded to the negative electrode post (2). The top of the cover plate (8) is provided with a rubber-coated component (11). The rubber-coated component (11) is fixedly installed with the top of the boss (14).

2. The novel highly integrated cylindrical battery structure according to claim 1, characterized in that, The insulating plastic (5) has a first explosion-proof valve mounting hole (7), and the cover plate (8) has a second explosion-proof valve mounting hole (10). The first explosion-proof valve mounting hole (7) and the second explosion-proof valve mounting hole (10) are corresponding to each other.

3. The novel highly integrated cylindrical battery structure according to claim 2, characterized in that, The same explosion-proof valve (12) is installed inside the first explosion-proof valve mounting hole (7) and the second explosion-proof valve mounting hole (10).

4. The novel highly integrated cylindrical battery structure according to claim 1, characterized in that, The shape of the pole slot (3) is not limited to ellipse, but can be square, round or triangular.

5. The novel highly integrated cylindrical battery structure according to claim 1, characterized in that, The top of the negative electrode post (2) has four solder marks (4), and the four solder marks (4) are all welded to the bottom of the negative electrode tab (13).

6. The novel highly integrated cylindrical battery structure according to claim 5, characterized in that, The weld stamp (4) is rectangular, and the shape and number of weld stamps (4) are not limited, and can be 1-10.

7. The novel highly integrated cylindrical battery structure according to claim 1, characterized in that, The cover plate (8) is made of aluminum.

8. The novel highly integrated cylindrical battery structure according to claim 1, characterized in that, The negative electrode post (2) can be made of pure copper or stainless steel.

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