High-power lead-acid storage battery system based on central compact tab

Abstract

The invention discloses a high-power lead-acid storage battery system based on a central compact tab, which comprises a positive grid and a negative grid, the center of one end of the positive grid is provided with a positive tab, and the center of one end of the negative grid is provided with a negative tab; by arranging the central compact positive tab and the negative tab and combining the fan-shaped radiation collector strips and the transition region, the current path resistance can be effectively reduced, the uniform distribution of current is realized, and local overheating and voltage drop are reduced. The main current collecting strips in the superconducting grid structure adopt'net diffusion 'and a variable cross-section structure, the joints of the main current collecting strips are thick, the far ends of the main current collecting strips are thin, and current distribution is optimized; the transition region can avoid current concentration, the internal resistance is effectively reduced compared with a traditional battery, and high-rate discharge can be supported. Through integration of the cooling channels, the cooling channels are vertically distributed on two sides of the pole group, and heat conduction optimization of the conductive structure is combined, so that temperature rise under a large-current working condition is reduced, and the risk of thermal runaway is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electrochemical energy storage, and particularly relates to a high-power lead-acid battery system based on a central compact tab. BACKGROUND

[0002] High-power lead-acid batteries are a type of battery specifically designed to provide high-current output, mainly used in scenarios that require instantaneous high power, such as starting power, UPS systems, high-end audio, and emergency lighting systems. Compared with conventional lead-acid batteries, high-power batteries have high-rate discharge capability, temperature control stability, and fast response characteristics.

[0003] Traditional high-power lead-acid batteries mostly use side tab design. This design has problems such as uneven current distribution, local overheating, and large voltage drop under high-current discharge conditions, limiting the power performance of the battery. Although there have been some attempts at central tab design, due to safety considerations of the distance between positive and negative tabs (usually more than 5 mm), the performance advantages of central tabs have not been maximized.

[0004] High-power lead-acid batteries on the market still have a lot of room for improvement in terms of extremely low internal resistance and extremely high-rate discharge, especially in terms of current uniformity, thermal management, and voltage stability. Through research, the high-power lead-acid batteries disclosed in US Patent No. US8920969B2 and European Patent No. EP2680366A1 have not been able to balance cost-effectiveness while achieving high power performance and use reliability, and have not been able to optimize thermal management to ensure safety and reliability under high-current conditions. SUMMARY

[0005] The purpose of the present application is to provide a high-power lead-acid battery system based on a central compact tab, which optimizes the grid design, active material formula, electrolyte composition, tab connection, and overall structure in response to the special needs of high-power applications. Through material optimization and structural innovation, the best balance between performance and cost is achieved.

[0006] To achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0007] A high-power lead-acid battery system based on a central compact tab, comprising a positive plate grid and a negative plate grid, a positive tab is arranged at one end of the positive plate grid, and a negative tab is arranged at one end of the negative plate grid, a superconductive grid structure capable of optimizing current distribution is arranged on one side of the positive plate grid and the negative plate grid, a transition zone avoiding current concentration and a fan-shaped radiation bus bar are arranged at the connection between the positive tab and the positive plate grid and between the negative tab and the negative plate grid, an electrically conductive structure with a cooling channel is arranged outside the positive plate grid and the negative plate grid, a safety valve is fixed at one end of the electrically conductive structure, and a battery shell is fixed outside the electrically conductive structure.

[0008] The superconductive grid structure comprises a main bus bar and a secondary bus grid, the staggered width of the main bus bar at the mutual staggered position is twice the width of the main bus bar away from the staggered end; the electrically conductive structure comprises a negative active body and a positive active body capable of improving the power of the battery.

[0009] Preferably, the electrically conductive structure further comprises a spacer sleeve, the outside of the positive plate grid forms a positive plate through fixing of the positive active body, the outside of the negative plate grid forms a negative plate through fixing of the negative active body, and the spacer sleeve is fixed outside the positive plate and the negative plate respectively;

[0010] A plurality of positive plates, negative plates and spacer sleeves form a pole group, a battery tank is fixed outside the pole group, a middle cover and a labyrinth sealing structure for fixing the middle cover are arranged at one end of the battery tank, the cooling channel is arranged on both sides of the inner cavity of the battery tank, and a bus bar is fixed between the middle cover and the electrodes of the pole group.

[0011] Preferably, the labyrinth sealing structure comprises a convex edge, the convex edge is integrally formed on the inner wall of one end of the battery tank and one side of the middle cover, the convex edge on one side of the battery tank is inserted into the gap between the convex edges on one side of the middle cover, and the battery tank and the middle cover are fixed after insertion.

[0012] Preferably, the safety valve is fixed on one side of the middle cover, the middle cover is provided with a heat dissipation fin on one side, the outer wall of the battery shell is provided with a heat dissipation groove, and graphite heat dissipation fins are embedded between the partitions.

[0013] Preferably, the transition length of the transition zone is 10±0.5mm, the thickness of the transition zone is arranged in an arithmetic progression from one end close to the positive plate grid and the negative plate grid to one end away from the positive plate grid and the negative plate grid, and the fan-shaped radiation bus bars are arranged in several groups and symmetrically distributed on both sides of the positive tab and the negative tab.

[0014] Preferably, the width of the positive tab and the negative tab is set to 20±0.5mm, and the height of the positive tab and the negative tab is set to 22±0.5mm.

[0015] Preferably, the positive plate grid is arranged as a lead calcium silver alloy grid with a composition of Pb-0.06Ca-1.2Sn-0.01Al, and the negative plate grid is arranged as a lead calcium silver alloy with a composition of Pb-0.08Ca-0.05Ag-0.01Cu.

[0016] Preferably, the thickness of the positive plate grid and the negative plate grid is arranged to be 1.3-1.5mm, the length of the positive plate grid and the negative plate grid is arranged to be 100-120mm, and the width of the positive plate grid and the negative plate grid is arranged to be 80-95mm.

[0017] A fillet is arranged at the corner of the positive plate grid and the negative plate grid, and the radius of the fillet is arranged to be 0.3±0.05mm.

[0018] Preferably, the width of the main bus bar is arranged to be 4.5±0.2mm, the height of the main bus bar is arranged to be 0.2±0.05mm, and the spacing between the cross beam and the vertical beam of the secondary bus grid is arranged to be 12±0.5mm.

[0019] Preferably, the positive active material includes nanoscale lead dioxide with a particle size in the range of 1-3um, conductive carbon black with a content ratio of 2.0-2.5%, barium titanate with a content ratio of 0.5-0.8%, and tin powder with a content ratio of 0.2-0.3%.

[0020] The negative active material includes fibrous sponge lead, carbon nanotubes with a content ratio of 1.0-1.5%, barium sulfate with a content ratio of 0.3-0.5%, and agar with a content ratio of 0.1-0.2%.

[0021] The high-power lead-acid battery system based on the central compact tab has the following advantages compared with the prior art:

[0022] 1. By arranging the central compact positive tab and the negative tab, combining the fan-shaped radiation bus bar and the transition area, the current path resistance can be effectively reduced, the current can be uniformly distributed, and local overheating and voltage drop can be reduced. The main bus bar in the superconducting grid structure adopts a "mesh diffusion" and a variable cross-section structure, the main bus bar connection is thick at the far end, the current distribution is optimized, the transition area can avoid current concentration, the internal resistance is effectively reduced compared with the traditional battery, and high-rate discharge can be supported.

[0023] 2. By integrating the cooling channel, the cooling channel is vertically distributed on both sides of the pole group, cooperates with the heat dissipation structure of the battery shell heat dissinkers and the middle cover heat dissipation fins, and optimizes the thermal conductivity of the conductive structure, so that the temperature rise is reduced under large current conditions, and the risk of thermal runaway is avoided.

[0024] 3、The application can reduce the use amount of noble metal and reduce the material cost by optimizing the distance between the positive tab and the negative tab. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is an exploded view of the application;

[0026] Figure 2 is an exploded view of the spacer sleeve and the conductive structure of the application;

[0027] Figure 3 is a structural schematic view of the conductive structure of the application;

[0028] Figure 4 is a structural schematic view of the positive plate grid and the negative plate grid of the application;

[0029] Figure 5 is a structural schematic view of the main current collecting bar and the secondary current collecting grid of the application.

[0030] In the figure: 1, positive plate grid; 2, negative plate grid; 3, positive tab; 4, negative tab; 5, superconducting grid structure; 6, transition zone; 7, fan-shaped radial current collecting bar; 8, cooling channel; 9, conductive structure; 10, safety valve; 11, battery shell; 501, main current collecting bar; 502, secondary current collecting grid; 9001, negative active body; 9002, positive active body; 9003, spacer sleeve; 901, positive electrode plate; 902, negative electrode plate; 12, pole group; 13, battery tank; 14, graphite heat dissipation fin; 15, busbar; 16, heat dissipation fin; 17, heat dissipation groove; 18, raised edge. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. The specific embodiments described herein are only used to explain the application, and are not used to limit the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0032] The application provides a battery as Figures 1-5The high-power lead-acid battery system based on the central compact tab includes a positive plate grid 1 and a negative plate grid 2, the central part of one end of the positive plate grid 1 is provided with a positive tab 3, the central part of one end of the negative plate grid 2 is provided with a negative tab 4, one side of the positive plate grid 1 and the negative plate grid 2 is provided with a superconductive grid structure 5 capable of optimizing current distribution, the connection part between the positive tab 3 and the positive plate grid 1 and the connection part between the negative tab 4 and the negative plate grid 2 are provided with a transition zone 6 avoiding current concentration and a fan-shaped radial busbar 7, the outside of the positive plate grid 1 and the negative plate grid 2 is provided with a conductive structure 9 with a cooling channel 8, one end of the conductive structure 9 is fixed with a safety valve 10, the outside of the conductive structure 9 is fixed with a battery shell 11.

[0033] The superconductive grid structure 5 includes a primary busbar 501 and a secondary grid 502, the staggered width of the mutual staggered part of the primary busbar 501 is twice the width of the primary busbar 501 away from the staggered end; the conductive structure 9 includes a negative active body 9001 and a positive active body 9002 capable of improving the power of the battery.

[0034] The negative tab 4 is located at the central position of the uppermost end of the negative plate grid 2, and adopts a compact layout (the distance between the negative tab 4 and the positive tab 3 is controlled to be 21±0.1mm). The traditional side tab design leads to uneven current distribution, while the central positive tab 3 and the negative tab 4 shorten the current transmission path, reduce the internal resistance and voltage drop. The size of the positive tab 3 and the negative tab 4 is width 20±0.5mm and height 22±0.5mm, which is consistent with the thickness of the main body of the positive plate grid 1 and the negative plate grid 2, so as to ensure the large current carrying capacity.

[0035] The current spreads from the central positive tab 3 to the surrounding, and is evenly distributed to the whole positive plate grid 1 through the superconductive grid structure 5, so as to avoid local overheating.

[0036] The width of the primary busbar 501 is 4.5±0.2mm, and the thickness is 0.2±0.05mm, forming a low-resistance channel; the density of the secondary grid 502 is increased by 40-45%, the distance between the horizontal beam and the vertical beam is reduced to 12±0.5mm, and the variable cross-section design is adopted, the connection part is thick and the far end is thin. The high-density grid shortens the ion transmission distance, the variable cross-section design optimizes the current distribution, reduces the current density difference in the edge area, and suppresses the local polarization effect.

[0037] The conductive structure 9 further includes a spacer 9003, the outside of the positive plate grid 1 forms a positive plate 901 by fixing the positive active body 9002, the outside of the negative plate grid 2 forms a negative plate 902 by fixing the negative active body 9001, and the spacer 9003 is fixed outside the positive plate 901 and the negative plate 902 respectively;

[0038] Several positive plate 901, negative plate 902 and spacer 9003 form the group 12, the outer fixed battery tank 13, one end of the battery tank 13 is provided with the middle cover and the fixed labyrinth seal structure of the middle cover, the cooling channel 8 is arranged in the two sides of the inner cavity of the battery tank 13, the middle cover and the electrode of the group 12 are fixed with the busbar 15.

[0039] The labyrinth seal structure includes a convex edge 18, which is integrally formed on the inner wall of one end of the battery tank 13 and one side of the middle cover, the convex edge 18 on one side of the battery tank 13 is inserted into the gap between the convex edge 18 on one side of the middle cover, and the battery tank 13 and the middle cover are inserted and fixed by heat melting.

[0040] By setting the labyrinth seal structure, the leakage of electrolyte is prevented. The labyrinth structure is the same as the labyrinth seal structure in the prior art, which can increase the contact area of the two objects to be connected and improve the sealing performance.

[0041] The safety valve 10 is fixed on one side of the middle cover, one side of the middle cover is provided with a heat dissipation fin 16, the outer wall of the battery shell 11 is provided with a heat dissipation groove 17, and the graphite heat dissipation sheet 14 is embedded between the partitions.

[0042] The cooling channel 8 and the heat dissipation fin 16 dissipate heat through natural convection, the cooling channel 8 is filled with cooling liquid, and the temperature rise is ensured to be less than or equal to 3 DEG C. The material of the battery shell 11 is high-performance ABS engineering plastic, and 15% glass fiber is added to increase the impact strength to greater than or equal to 35 kJ / m 2 , the thickness is 2.5±0.1mm, which ensures sufficient mechanical strength and air tightness, the internal design is reinforced with ribs with a spacing of 30±2mm and a height of 2.0±0.1mm, which improves the structural stability.

[0043] The middle cover is made of the same ABS material as the battery shell 11, and the thickness is increased to 5.5±0.2mm, the busbar 15 is made of high-purity electrolytic lead (purity greater than or equal to 99.99%), which has very low resistance, the cross-sectional width of the busbar 15 is 22±0.5mm, and the cross-sectional thickness is 3.0±0.1mm, which is sufficient to carry a 20C large current.

[0044] The positive tab 3 and the negative tab 4 are connected to the busbar 15 by ultrasonic welding process, the welding area is greater than or equal to 90%, and the contact resistance is less than or equal to 0.1 mΩ.

[0045] The transition length of the transition zone 6 is 10±0.5mm, the thickness of the transition zone 6 is arranged in equal difference increment from one end close to the positive plate grid 1 and the negative plate grid 2 to the other end away from the positive plate grid 1 and the negative plate grid 2; the fan-shaped radiation busbar 7 is arranged in several groups, and the fan-shaped radiation busbars 7 in several groups are symmetrically distributed on both sides of the positive tab 3 and the negative tab 4.

[0046] The positive tab 3 and the negative tab 4 are connected to the positive grid 1 and the negative grid 2 at the gradually changing transition zone 6, the thickness gradually changes to avoid current mutation, reduce the contact resistance and Joule heat at the connection point. The fan-shaped structure of the symmetrically distributed fan-shaped busbar 7 uniformly disperses the current to the grid edge to prevent local temperature rise caused by current concentration.

[0047] The width of the positive tab 3 and the negative tab 4 is set to 20±0.5mm, and the height of the positive tab 3 and the negative tab 4 is set to 22±0.5mm.

[0048] The positive grid 1 is set to a lead-calcium-silver alloy grid with a composition of Pb-0.06Ca-1.2Sn-0.01Al, and the negative grid 2 is set to a lead-calcium-silver alloy with a composition of Pb-0.08Ca-0.05Ag-0.01Cu.

[0049] The positive grid 1 and the negative grid 2 use high-purity lead-calcium-silver alloy, which can reduce the grain boundary resistance caused by impurities and improve the electrical conductivity. The rounded corner design can reduce electrolyte corrosion and avoid cracks caused by edge stress concentration, prolonging the life of the positive grid 1 and the negative grid 2.

[0050] The thickness of the positive grid 1 and the negative grid 2 is set to 1.3-1.5mm, the length of the positive grid 1 and the negative grid 2 is set to 100-120mm, and the width of the positive grid 1 and the negative grid 2 is set to 80-95mm.

[0051] The corners of the positive grid 1 and the negative grid 2 are provided with rounded corners, and the radius of the rounded corners is set to 0.3±0.05mm.

[0052] The width of the main busbar 501 is set to 4.5±0.2mm, the height of the main busbar 501 is set to 0.2±0.05mm, and the spacing between the horizontal beams and vertical beams of the secondary busbar grid 502 is set to 12±0.5mm.

[0053] The positive active material 9002 includes nanoscale lead dioxide with a particle size in the range of 1-3μm, conductive carbon black with a content ratio of 2.0-2.5%, forming a conductive network to reduce internal resistance, barium titanate with a content ratio of 0.5-0.8%, improving structural stability and cycle performance, and tin powder with a content ratio of 0.2-0.3%, improving electrical conductivity and sulfate resistance; the compaction density is reduced to 3.8-4.0g / cm 3 , increasing the electrolyte contact area and improving the reaction activity.

[0054] Nano-sized lead dioxide and conductive carbon black increase the specific surface area and the coverage of the conductive network, the particle size is controlled at 1-3 μm, the specific surface area is increased by 50-60%, the reaction rate and the charge transfer efficiency are improved, barium titanate and barium sulfate enhance the structural stability and inhibit the shedding of active materials and sulfation.

[0055] The negative active body 9001 includes fibrous sponge lead, the specific surface area is increased by 80-90%, the reaction rate is improved, the content of carbon nanotubes is 1.0-1.5%, a three-dimensional conductive network is formed, the internal resistance is greatly reduced, the content of barium sulfate is 0.3-0.5%, the negative electrode shrinkage is inhibited, the cycle performance is improved, the content of agar is 0.1-0.2%, a porous structure is formed, the gas compounding ability is improved, and the compaction density is optimized to 4.2-4.4 g / cm 3 , the conductivity and the mechanical strength are balanced.

[0056] The active body thickness is controlled: the positive electrode is 1.5-1.8 mm, the negative electrode is 1.3-1.5 mm, which is 30-35% thinner than the conventional design, the high-density short fiber reinforced polyester separator sleeve 9003 is used, the thickness is 0.8±0.05 mm, the porosity is 60±2%, the number ratio of the positive plate group and the negative plate group is optimized to 1:1.2, the charge acceptance is improved, the plate spacing is reduced to 1.0±0.1 mm, the electrolyte impedance is reduced, and the gas channel is ensured to be unobstructed.

[0057] When used, the sulfuric acid concentration is optimized to 1.320±0.005 g / cm 3 (25℃), the conductivity and the corrosion resistance are balanced; 0.02-0.03% of phosphate is added to inhibit the hydrogen evolution reaction and reduce water loss; 0.01-0.02% of organic sulfide is added to improve the negative electrode charging efficiency; the electrolyte purity is controlled: the metal impurities are ≤0.2 ppm, the electrochemical purity is ensured, the electrolyte conductivity is increased by 15-20%, and reaches 0.82-0.85 S / cm (25℃);

[0058] The electrolyte distribution is: the total amount of electrolyte is controlled: the free electrolyte volume of the battery is 5-8% of the total volume, the internal resistance is reduced; the vacuum pulse injection technology is used to ensure that the electrolyte penetrates into the inside of the plate, the plate liquid absorption rate is optimized: the positive felt is 280-300%, the negative felt is 230-250%, the electrolyte is preheated to 45±2℃ before injection, and the penetration uniformity is improved.

[0059] The central positive pole lug 3 and the negative pole lug 4 of the application can shorten the current transmission path, reduce the internal resistance and voltage drop, and avoid local overheating by diffusing the current from the central positive pole lug 3 to the periphery and uniformly distributing the current to the entire positive plate grid 1 through the superconducting grid structure 5. By optimizing the spacing between the positive pole lug 3 and the negative pole lug 4, the amount of noble metal can be reduced, and the material cost can be reduced.

[0060] Finally, it should be noted that the above description is only a preferred embodiment of the application and is not intended to limit the application. Although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features, as long as they are within the spirit and principles of the application. Any modification, equivalent replacement, improvement, etc. shall be included in the protection scope of the application.

Claims

1. A central compact tab based high power lead acid battery system characterized by: The application relates to a battery, which comprises a positive plate grid (1) and a negative plate grid (2), the central part of one end of the positive plate grid (1) is provided with a positive electrode lug (3), the central part of one end of the negative plate grid (2) is provided with a negative electrode lug (4), one side of the positive plate grid (1) and the negative plate grid (2) is provided with a superconductive grid structure (5) capable of optimizing current distribution, the connection part between the positive electrode lug (3) and the positive plate grid (1) and the connection part between the negative electrode lug (4) and the negative plate grid (2) are provided with a transition area (6) capable of avoiding current concentration and a fan-shaped radiation busbar (7), the outer part of the positive plate grid (1) and the negative plate grid (2) is provided with a conductive structure (9) provided with a cooling channel (8), one end of the conductive structure (9) is fixed with a safety valve (10), and the outer part of the conductive structure (9) is fixed with a battery shell (11). The superconductive grid structure (5) comprises primary busbars (501) and secondary busbar grids (502), the staggered width of the primary busbars (501) at the staggered part is twice the width of the primary busbars (501) away from the staggered end; the conductive structure (9) comprises a negative active body (9001) and a positive active body (9002) capable of improving the power of the battery.

2. A central compact tab based high power lead-acid battery system as claimed in claim 1, wherein: The conductive structure (9) further comprises a spacer sleeve (9003), the outer part of the positive plate grid (1) forms a positive electrode plate (901) by fixing the positive active body (9002), the outer part of the negative plate grid (2) forms a negative electrode plate (902) by fixing the negative active body (9001), and the spacer sleeve (9003) is fixed at the outer part of the positive electrode plate (901) and the negative electrode plate (902) respectively; A plurality of the positive electrode plates (901), the negative electrode plates (902) and the spacer sleeves (9003) form a pole group (12), the outer part of the pole group (12) is fixed with a battery tank (13), one end of the battery tank (13) is provided with a middle cover and a labyrinth sealing structure for fixing the middle cover, the cooling channel (8) is arranged on both sides of the inner cavity of the battery tank (13), and the middle cover is fixed with a busbar (15) between the electrodes of the pole group (12).

3. A central compact tab based high power lead-acid battery system as claimed in claim 2, wherein: The labyrinth sealing structure comprises a convex edge (18), the convex edge (18) is integrally formed on the inner wall of one end of the battery tank (13) and one side of the middle cover, the convex edge (18) on one side of the battery tank (13) is inserted into the gap of the convex edge (18) on one side of the middle cover, and the battery tank (13) and the middle cover are fixed by heat melting after being inserted.

4. A central compact tab based high power lead-acid battery system as claimed in claim 3, wherein: The safety valve (10) is fixed on one side of the middle cover, one side of the middle cover is provided with a heat dissipation fin (16), the outer wall of the battery shell (11) is provided with a heat dissipation groove (17), and graphite heat dissipation sheets (14) are embedded between the partitions.

5. A central compact tab based high power lead-acid battery system as claimed in claim 4, wherein: The transition length of the transition zone (6) is 10±0.5mm, the thickness of the transition zone (6) is set to be increased by equal difference from one end of the positive plate grid (1) and the negative plate grid (2) to the other end away from the positive plate grid (1) and the negative plate grid (2); the fan-shaped radiation bus bar (7) is set by several groups, and several groups of the fan-shaped radiation bus bar (7) are symmetrically distributed on the two sides of the positive tab (3) and the negative tab (4).

6. A central compact tab based high power lead-acid battery system as claimed in claim 5, wherein: The width of the positive tab (3) and the negative tab (4) is set to be 20±0.5mm, and the height of the positive tab (3) and the negative tab (4) is set to be 22±0.5mm.

7. A central compact tab based high power lead-acid battery system as claimed in claim 6, wherein: The positive plate grid (1) is set to be a lead-calcium-silver alloy grid with a composition of Pb-0.06Ca-1.2Sn-0.01Al, and the negative plate grid (2) is set to be a lead-calcium-silver alloy with a composition of Pb-0.08Ca-0.05Ag-0.01Cu.

8. A central compact tab based high power lead-acid battery system as claimed in claim 7, wherein: The thickness of the positive plate grid (1) and the negative plate grid (2) is set to be 1.3-1.5mm, the length of the positive plate grid (1) and the negative plate grid (2) is set to be 100-120mm, and the width of the positive plate grid (1) and the negative plate grid (2) is set to be 80-95mm. The corners of the positive plate grid (1) and the negative plate grid (2) are all set with a fillet, and the radius of the fillet is set to be 0.3±0.05mm.

9. A central compact tab based high power lead-acid battery system as claimed in claim 1, wherein: The width of the main bus bar (501) is set to be 4.5±0.2mm, the height of the main bus bar (501) is set to be 0.2±0.05mm, and the spacing between the cross beam and the vertical beam of the secondary bus grid (502) is set to be 12±0.5mm.

10. A central compact tab based high power lead-acid battery system as claimed in claim 1, wherein: The positive active body (9002) includes nanoscale lead dioxide with a particle size in the range of 1-3μm, conductive carbon black with a content of 2.0-2.5%, barium titanate with a content of 0.5-0.8%, and tin powder with a content of 0.2-0.3%; The negative active body (9001) includes fibrous sponge lead, carbon nanotubes with a content of 1.0-1.5%, barium sulfate with a content of 0.3-0.5%, and agar with a content of 0.1-0.2%.

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