A lead-acid battery with multiple tabs at both ends of the electrode plate and its preparation method

Abstract

This invention discloses a lead-acid battery with a multi-tab design at both ends of the plates and its manufacturing method. The battery uses positive and negative tabs at the upper and lower ends of the positive and negative plates, respectively. After forming clusters, the positive / negative tabs located at the same end and in the same row are connected by a positive / negative busbar. Positive / negative terminals are provided on the positive / negative busbar. Positive and negative terminals are connected in series between adjacent electrode groups. A sealing groove protrudes downwards from the inner bottom surface of the battery case. When the electrode groups are inserted into the groove, sealant is poured into the sealing groove. After the electrode groups are inserted, the positive / negative terminals extend into the sealing groove and the sealant is cured. After curing, part of the sealing groove and sealant is removed from the outer bottom surface of the battery case, exposing part of the positive / negative terminals. Connecting tabs are used to pair and connect the positive and negative terminals of adjacent electrode groups in series. This invention also discloses a method for manufacturing the aforementioned lead-acid battery with a multi-tab design at both ends of the plates.

Description

Technical Field

[0001] This invention relates to the field of lead-acid batteries, and in particular to a lead-acid battery with a multi-tab design at both ends of the electrode plates and its preparation method. Background Technology

[0002] In the more than 160 years since its invention, lead-acid batteries have evolved from flooded lead-acid batteries to valve-regulated lead-acid batteries without free electrolyte. However, technicians have discovered that the symmetrical assembly of single-tab plates along the centerline in valve-regulated lead-acid batteries (or simply lead-acid batteries) results in high current density at the tabs and grids of each plate under the busbar. During cycling, the volume of the upper active material changes significantly, leading to inconsistent utilization of the active material on each plate. This, in turn, causes the lead paste PAM skeleton on the plate to collapse, ultimately reducing the plate capacity and causing battery failure.

[0003] To solve the above problems, technicians began to consider changing the arrangement of the positive and negative electrode tabs on the coated electrode plates, and changing the polarity of the electrode group to a centrally symmetrical arrangement, thereby eliminating the "top and bottom" effect of the battery electrode group. Specifically, Chinese Patent Publication No. CN114566722A discloses a long-life lead-acid battery and its manufacturing method. This battery includes a battery case, an upper cover disposed at the upper end of the battery case, a lower cover disposed at the lower end of the battery case, and electrode plates disposed within the battery case. The electrode plates include a positive electrode plate and a negative electrode plate, and at least one electrode tab is disposed on the upper and lower edges of each electrode plate. The battery compartment has multiple individual cells connecting the upper and lower ends. The upper end of the battery compartment is open, and the lower end includes a base plate with multiple openings corresponding to the tabs. The tabs on the lower edge of the electrode plate pass through the openings at the lower end of the battery compartment, and the lower edge of the electrode plate contacts the base plate. The same polarity tabs at the upper end of the battery compartment are connected through an upper busbar, and the same polarity tabs at the lower end of the battery compartment are connected through a lower busbar. The same polarity busbars at the upper and lower ends are connected by wires. A positive terminal and a negative terminal are respectively provided at the positive terminal output point and the negative terminal output point of the upper positive terminal busbar.

[0004] For example, Chinese patent CN206461047U discloses a lead-acid battery that achieves electrode symmetry by designing a symmetrical structure of a single tab electrode plate, thereby minimizing the impact of the tabs being located at the top on the active material in the lower part of the electrode group.

[0005] However, while the lead-acid battery structure disclosed in the aforementioned patent helps eliminate the inconsistency in the utilization rate of active materials on the upper and lower plates, the sealing method of the busbars outside the upper and lower tabs of the electrode group becomes a design challenge. Since the busbars of multi-cell batteries, in addition to their function of "current convergence," also need to connect other cells in series, existing technologies typically involve an additional bottom cover. After the bottom busbar reaches its processing position within the battery case, it is sealed by adhesive bonding between the bottom cover, the busbar, and the battery case to prevent "cell crosstalk" between individual cells. However, because the space between the bottom of the electrode grid and the bottom busbar needs to prevent excessive accumulation of free electrolyte at the bottom, and the separator needs to extend at least 3mm beyond the bottom of the grid to prevent short circuits, the processing height of the busbar and the grid generally does not exceed [a certain value]. The distance between the lower edge of the electrode group and the upper part of the bottom busbar is only about 2mm during the electrode group insertion process. This makes it very easy for the sealant to creep and stick to the separator during the bottom cover sealing process. Moreover, it is not easy to check this phenomenon during the production process, resulting in individual batteries being outdated due to separator adhesion after leaving the factory. In addition, the design and sealing method of adding a bottom cover sealant to seal the lower busbar of the electrode group increases the battery production cost and raw material cost, and the operation is cumbersome. For lead-acid batteries, this adds another difficult-to-control quality risk point. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention discloses a lead-acid battery with a multi-tab design at both ends of the electrode plate and a method for its preparation.

[0007] A lead-acid battery with a multi-tab design at both ends of the electrode plates includes a battery case and a battery cover that overlap each other. The battery case is divided into multiple compartments, each compartment containing an electrode group. The electrode group includes alternating positive and negative electrode plates, with partitions between adjacent positive and negative electrode plates. Each positive electrode plate has positive tabs at its upper and lower ends, and each negative electrode plate has negative tabs at its upper and lower ends. Positive tabs located at the same end and in the same row within each electrode group are connected by a positive busbar, which has a positive terminal. Similarly, negative tabs located at the same end and in the same row within each electrode group are connected by a negative busbar, which has a negative terminal. Positive and negative terminals are connected in series between adjacent electrode groups. A positive terminal and a negative terminal located at the first and last positions on the top surface of the lead-acid battery serve as the positive and negative terminals, respectively.

[0008] The inner bottom surface of the battery compartment has a downward-protruding sealing groove for accommodating the positive or negative terminal post of the electrode group. When the electrode group is inserted into the groove, the sealing groove is filled with sealant. After the electrode group is inserted into the groove, the positive or negative terminal post extends into the sealing groove and the sealant is cured. After curing, part of the sealing groove and sealant is removed from the outside of the bottom surface of the battery compartment to expose the positive or negative terminal post located in the sealing groove. Then, the positive and negative terminal posts on adjacent electrode groups are paired and connected in series using connecting pieces.

[0009] Specifically, in this structure, although busbars and terminals are provided on both the top and bottom sides of the lead-acid battery, the entire lead-acid battery still only needs to be equipped with one battery cover. Compared with lead-acid batteries with two battery covers, this can greatly reduce the production process of lead-acid batteries and effectively reduce production costs. Moreover, this sealing structure can effectively prevent the lower separator from being contaminated by sealant when sealing the electrode group, thereby improving the quality of lead-acid batteries.

[0010] Preferably, the connecting piece includes two connecting holes that are respectively fitted to the positive terminal and the negative terminal, and the connecting piece is connected to the positive terminal and the negative terminal by welding.

[0011] Preferably, each of the connecting pieces and the pair of positive and negative terminals exposed outside the battery compartment connected in series with the connecting piece are waterproofed and sealed with rubber waterproof suction cups during formation, and the rubber waterproof suction cups are replaced with plastic protective sleeves after formation.

[0012] Specifically, a rubber waterproof suction cup is used to attach to the positive and negative terminals. This provides a waterproof seal without affecting the stable and upright placement of the lead-acid battery. Furthermore, the rubber waterproof suction cup is detachably connected to the positive and negative terminals, meaning it can be reused, which effectively reduces the production cost of lead-acid batteries.

[0013] Preferably, the four side walls of the battery compartment extend towards the bottom to form a raised ring, and the rubber waterproof suction cup or plastic protective sleeve does not protrude from the bottom surface of the raised ring after installation.

[0014] Preferably, the amount of sealant injected into the sealing groove does not overflow outside the sealing groove after the electrode group enters the groove.

[0015] Preferably, the positive tabs at both ends of the positive electrode plate are centered or offset to one side; similarly, the negative tabs at both ends of the negative electrode plate are centered or offset to one side.

[0016] Preferably, the positive electrode plate has 1 to 3 positive tabs at both the upper and lower ends, and the positive tabs arranged in a row on all the positive electrode plates in each electrode group are connected by the same positive busbar; the negative electrode plate has 1 to 3 negative tabs at both the upper and lower ends, and the negative tabs arranged in a row on all the negative electrode plates in each electrode group are connected by the same negative busbar.

[0017] Preferably, the bottom surface of the battery compartment is further provided with a groove for accommodating the positive or negative busbar, the groove being connected to the sealing groove; the length and width of the groove are both 2-3 mm greater than the length and width of the matching positive or negative busbar; the sum of the depth of the sealing groove and the depth of the groove is 1-2 mm greater than the depth of the positive busbar and positive terminal or the negative busbar and negative terminal.

[0018] Specifically, this structure facilitates the insertion of the positive terminal post and positive busbar, the negative terminal post and negative busbar into the sealing groove and recess, and also facilitates the pre-filling of adhesive into the sealing groove.

[0019] Preferably, the bottom of the sealing groove is made of ABS material.

[0020] Specifically, since the bottom of the sealing groove will be removed eventually, it can be made of ABS material with a thickness of about 0.3mm.

[0021] A method for manufacturing a lead-acid battery with multiple tabs at both ends of the plates, using any of the lead-acid batteries with multiple tabs at both ends of the plates described above, includes the following steps:

[0022] (1) Assemble the positive electrode plate, negative electrode plate and separator into an electrode group;

[0023] (2) A positive electrode busbar, a positive electrode post, a negative electrode busbar, and a negative electrode post are formed by casting and welding. Positive electrode tabs located at the same end and in the same row in the electrode group are connected by a positive electrode busbar, and a positive electrode post is provided on the positive electrode busbar. Negative electrode tabs located at the same end and in the same row in the electrode group are connected by a negative electrode busbar, and a negative electrode post is provided on the negative electrode busbar.

[0024] (3) Add sealant to the sealing groove on the bottom of the battery compartment, insert the electrode group into the groove, and each positive or negative electrode post extends into the corresponding sealing groove.

[0025] (4) The sealant cures;

[0026] (5) After the sealant has cured, remove part of the sealing groove and sealant from the outside of the bottom of the battery compartment to expose the positive or negative terminal in the sealing groove, and use connecting pieces to connect the positive and negative terminals on adjacent electrode groups in series by welding.

[0027] (6) After installing the battery cover and filling it with electrolyte, the battery is formed. Before the formation, each of the connecting pieces and the pair of positive and negative terminals exposed outside the battery compartment are sealed with a rubber waterproof suction cup. After the formation is completed, the rubber waterproof suction cup is replaced with a plastic protective sleeve.

[0028] Compared with the prior art, the advantages of the present invention are:

[0029] With tabs at both the top and bottom of the plates, busbars are located at both ends of the electrode group. This structure ensures higher consistency in the utilization of active materials on both the top and bottom of the plates. Simultaneously, a sealing groove is provided at the bottom of the battery case. This groove, along with sealant, secures the busbars and terminals at the bottom of the electrode group. The sealing groove is removable; after the electrode group is installed in the case, part of the sealing groove is removed, exposing the terminals. Adjacent terminals with opposite polarities are then connected. This structure means that the entire lead-acid battery still requires only one battery cover, significantly reducing production steps and effectively lowering production costs. Furthermore, this sealing structure effectively prevents the lower separator from being contaminated by sealant during electrode group sealing, thereby improving the quality of the lead-acid battery. Attached Figure Description

[0030] Figure 1 A cross-sectional view of a lead-acid battery with a multi-tab design at both ends of the electrode plate provided by the present invention;

[0031] Figure 2 An internal schematic diagram of a lead-acid battery with a multi-tab design at both ends of the electrode plate provided by the present invention;

[0032] Figure 3 A schematic diagram of the lead-acid battery with multiple tabs at both ends of the electrode plate provided by the present invention after the sealing grooves have been removed;

[0033] Figure 4 A schematic diagram showing the connection of the connecting piece of the lead-acid battery with the multi-tab design at both ends of the electrode plate provided by the present invention to the adjacent electrode post;

[0034] Figure 5 A schematic diagram of the formation state of a lead-acid battery with a multi-tab design at both ends of the electrode plate provided by the present invention;

[0035] Figure 6 A schematic diagram of the electrode plate in Embodiment 3 of the present invention;

[0036] Figure 7 This is a schematic diagram of the top of the electrode group after the busbar welding is completed in Embodiment 3 of the present invention.

[0037] Figure 8 This is a schematic diagram of the bottom of the electrode group after the busbar welding is completed in Embodiment 3 of the present invention;

[0038] Figure 9 This is a schematic diagram of the connecting piece after connecting adjacent poles in Embodiment 3 of the present invention;

[0039] Figure 10 A schematic diagram of the electrode plate in Embodiment 4 of the present invention;

[0040] Figure 11 A schematic diagram of the electrode plate in Embodiment 5 of the present invention;

[0041] Figure 12 This is a schematic diagram of the top of the electrode group after the busbar welding is completed in Embodiment 5 of the present invention.

[0042] Figure 13 This is a schematic diagram of the bottom of the electrode group after the busbar welding is completed in Embodiment 5 of the present invention;

[0043] Figure 14 This is a schematic diagram of the connecting piece after connecting adjacent poles in Embodiment 5 of the present invention. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1

[0046] like Figure 1 As shown, a lead-acid battery with multiple tabs at both ends of the plates includes a battery case 10 and a battery cover that fit together. The battery case 10 is divided into multiple compartments, each compartment containing a group of electrodes. Each group of electrodes includes alternating positive and negative plates, with partitions between adjacent positive and negative plates. Each positive plate has positive tabs at its upper and lower ends, and each negative plate has negative tabs at its upper and lower ends. Figure 2 As shown, the positive tabs located at the same end and in the same row in each electrode group are connected by a positive busbar 31, and a positive terminal 41 is provided on the positive busbar 31. The negative tabs located at the same end and in the same row in each electrode group are connected by a negative busbar 32, and a negative terminal 42 is provided on the negative busbar 32. The positive terminal 41 and the negative terminal 42 are connected in series between adjacent electrode groups. The positive terminal 41 and the negative terminal 42 located at the beginning and end of the top surface of the lead-acid battery serve as the positive terminal 91 and the negative terminal 92 of the lead-acid battery, respectively.

[0047] The inner bottom surface of the battery compartment 10 has a downward-protruding sealing groove 11 for accommodating the positive electrode post 41 or negative electrode post 42 on the bottom surface of the electrode group. When the electrode group is inserted into the groove, the sealing groove 11 is filled with sealant 60. After the electrode group is inserted into the groove, the positive electrode post 41 or negative electrode post 42 extends into the sealing groove 11 and the sealant 60 is cured. Figure 3 As shown, after curing, a portion of the sealing groove 11 and sealant 60 are removed from the outer side of the bottom surface of the battery compartment 10, exposing the positive electrode post 41 or negative electrode post 42 located in the sealing groove 11, and the positive electrode post 41 and negative electrode post 42 on adjacent electrode groups are paired and connected in series using the connecting piece 50.

[0048] In this structure, although busbars and terminals are provided on both the top and bottom sides of the lead-acid battery, the entire lead-acid battery still only needs to be equipped with one battery cover. Compared with lead-acid batteries with two battery covers, this can greatly reduce the production process of lead-acid batteries and effectively reduce production costs. Moreover, this sealing structure can effectively prevent the lower separator from being contaminated by sealant during the sealing of the electrode group, thereby improving the quality of lead-acid batteries.

[0049] like Figure 4 As shown, the connecting piece 50 includes two connecting holes that are respectively fitted to the positive terminal 41 and the negative terminal 42, and the connecting piece 50 is connected to the positive terminal 41 and the negative terminal 42 by welding.

[0050] like Figure 5 As shown, each connecting piece 50 and the pair of positive terminals 41 and negative terminals 42 connected in series with the connecting piece 50 and exposed outside the battery compartment 10 are waterproofed and sealed with rubber waterproof suction cups 80 during formation. After formation, the rubber waterproof suction cups 80 are replaced with plastic protective sleeves.

[0051] A rubber waterproof suction cup 80 is attached to the outside of the positive terminal 41 and the negative terminal 42. This not only provides waterproof sealing but also does not affect the stable and upright placement of the lead-acid battery. In addition, the rubber waterproof suction cup 80 is detachably connected to the positive terminal 41 and the negative terminal 42, meaning that the rubber waterproof suction cup 80 can be reused, which can effectively reduce the production cost of lead-acid batteries.

[0052] The four side walls of the battery compartment 10 extend to one side of the bottom to form a raised ring 12. The rubber waterproof suction cup 80 or the plastic protective cover does not protrude from the bottom surface of the raised ring 12 after installation.

[0053] The amount of sealant 60 injected into the sealing groove 11 does not overflow outside the sealing groove 11 after the electrode group enters the groove.

[0054] The positive tabs at both ends of the positive plate are either centered or offset to one side; similarly, the negative tabs at both ends of the negative plate are either centered or offset to one side.

[0055] The positive electrode plate has 1 to 3 positive tabs at both the upper and lower ends. In each electrode group, the positive tabs arranged in a row on all the positive electrode plates are connected by the same positive busbar 31. The negative electrode plate has 1 to 3 negative tabs at both the upper and lower ends. In each electrode group, the negative tabs arranged in a row on all the negative electrode plates are connected by the same negative busbar 32.

[0056] The bottom surface of the battery compartment 10 is also provided with a groove for accommodating the positive busbar 31 or the negative busbar 32, and the groove is connected to the sealing groove 11; the length and width of the groove are both 2-3 mm greater than the length and width of the positive busbar 31 or the negative busbar 32 that it is adapted to; the sum of the depth of the sealing groove 11 and the depth of the groove is 1-2 mm greater than the depth of the positive busbar 31 and the positive terminal post 41 or the negative busbar 32 and the negative terminal post 42.

[0057] This structure facilitates the insertion of the positive electrode post 41 and positive busbar 31, and the negative electrode post 42 and negative busbar 32 into the sealing groove 11 and recess, and also facilitates the pre-filling of adhesive into the sealing groove 11.

[0058] The bottom of the sealing groove 11 is made of 0.3mm ABS material.

[0059] Example 2

[0060] like Figure 2-5 As shown, this is a method for manufacturing a lead-acid battery with multiple tabs at both ends of the electrode plate. In this embodiment, the electrode group consists of a single tab 21 and an electrode plate 20.

[0061] The positive electrode plate, negative electrode plate, and separator are assembled into an electrode group. Specifically, the separator is an AGM separator with a U-shaped wrapping. The AGM separator is wrapped around the bottom of the negative electrode plate. The negative electrode plate and the positive electrode plate covered with the AGM separator are stacked in a way that the tabs 21 and the electrode plate 20 are centrally symmetrical. After the tabs 21 of the same polarity are stacked in the same direction and wrapped together with the separator to form an electrode group, the tabs 21 of adjacent electrode groups are arranged with alternating polarities to form an electrode group.

[0062] The top and bottom tabs 21 of each pole group are cast and welded. Each pole group has a busbar at the top and bottom, forming two rows of discontinuous busbars. The pair of busbars generated by each pole group are centrally symmetrical along the center of the pole group.

[0063] The bottom of the battery compartment 10 is provided with six sealing grooves 11. Sealant 60 is injected into the six sealing grooves 11. The amount of sealant injected into a single sealing groove 11 is 4-5g. Within 3 minutes after the sealant is injected into the sealing groove 11, the electrode groups are placed into the groove. Each electrode group is placed into the bottom of the battery compartment 10 according to the process requirements. After the insertion, each connecting post is completely immersed in the sealant 60 in the corresponding sealing groove 11. After the insertion is completed, the sealant is injected into the glue tank of the battery compartment 10. After the glue is injected, the top cover and the battery compartment 10 are closed. After the battery cover and the battery compartment 10 are closed, they can be put into the curing kiln for heating at the same time to accelerate the curing of the sealant 60 in the battery.

[0064] After curing, the lead-acid battery is inverted with the bottom of the battery compartment 10 facing upwards. A milling machine is used to mill the sealing groove 11 of the lead-acid battery. After milling, the sealant 60 inside the sealing groove 11 is bonded between the terminal post and the inner wall of the sealing groove 11, keeping the sealant 60 sealing the bottom of the battery compartment 10. The terminal post extends out of the sealing groove 11 in a "convex" shape, with the top of the terminal post exposed outside the sealant 60.

[0065] The terminals on adjacent terminal groups are the terminals on the positive and negative busbars, respectively. They are connected by connecting pieces 50 with connecting holes. The connecting pieces 50 are made of copper and have a zinc-plated outer layer. The connecting pieces 50 and the terminals are welded using an automatic soldering machine. One connecting piece 50 connects a pair of terminals with opposite polarities. A total of three connecting pieces 50 are welded. The welded "weld package 70" is full, firm, and beautiful, and its height will not protrude from the bottom surface where the convex ring 12 is located, so it will not affect the stable placement of the lead-acid battery.

[0066] After the connecting piece 50 and the terminal post are fully welded, the exposed bottom weldment 70, connecting piece 50, etc. are sealed with rubber waterproof suction cups 80. Each rubber waterproof suction cup 80 covers the bottom connecting piece 50, sealing groove 11, weldment 70, etc. of the lead-acid battery. The bottom edge of the rubber waterproof suction cup 80 is close to the bottom of the battery compartment 10, which helps to isolate the inside and outside of the suction cup, so that cooling water will not enter the rubber waterproof suction cup 80 during the formation process, thus ensuring the formation quality of the lead-acid battery.

[0067] After the formation process is complete, 80 ABS protective sleeves can be used to replace the rubber waterproof suction cups outside the welding area to avoid the risk of short circuits and wear in the welding area at the bottom of the lead-acid battery during use.

[0068] Example 3

[0069] like Figure 6-9 As shown, the manufacturing method of a lead-acid battery with multiple tabs at both ends of the electrode plate is described. In this embodiment, the electrode group consists of electrode plates 20 with one tab 21 at each end and arranged in a centrally symmetrical manner. The structure of the electrode plate 20 is as follows: Figure 6 As shown.

[0070] All positive and negative plates and separators are assembled into an electrode group. The negative plate is covered by a single separator stacking method. The perimeter of the separator extends more than 4mm beyond the perimeter of the negative plate to avoid short circuits between the positive and negative plates. After the arrangement is completed, the tabs 21 of adjacent electrode groups are arranged with alternating polarities. The tabs 21 at the top of the electrode group are arranged in two rows, and the tabs 21 at the bottom of the electrode group are arranged in two rows to form an electrode group.

[0071] The pole groups are cast and welded. After casting and welding, each pole group has a positive and a negative busbar at the top and bottom. The different polarity busbars at the top and bottom of each pole group are axially symmetrical to the pole group, and the polarity of the pole group busbars is opposite to that of the adjacent pole group busbars. The top busbars are cast and welded to the adjacent polarity busbars to form a connector, which is integrally formed. The bottom pole group busbars are cast and welded to form a single connecting column, which is not connected to the adjacent busbars for the time being.

[0072] The bottom of the battery compartment 10 is provided with twelve sealing grooves 11. Sealant 60 is injected into the twelve sealing grooves 11. The amount of sealant injected into a single sealing groove 11 is 4-5g. Within 3 minutes after the sealant is injected into the sealing groove 11, the electrode groups are placed into the groove. Each electrode group is placed into the bottom of the battery compartment 10 according to the process requirements. After the insertion, each connecting post is completely immersed in the sealant 60 in the corresponding sealing groove 11. After the insertion is completed, the sealant is injected into the glue groove of the battery compartment 10. After the glue is injected, the top cover and the battery compartment 10 are closed. After the battery cover and the battery compartment 10 are closed, they can be put into the curing kiln for heating at the same time to accelerate the curing of the sealant 60 in the battery.

[0073] After curing, the lead-acid battery is inverted with the bottom of the battery compartment 10 facing upwards. A milling machine is used to mill the sealing groove 11 of the lead-acid battery. After milling, the sealant 60 inside the sealing groove 11 is bonded between the terminal post and the inner wall of the sealing groove 11, keeping the sealant 60 sealing the bottom of the battery compartment 10. The terminal post extends out of the sealing groove 11 in a "convex" shape, with the top of the terminal post exposed outside the sealant 60.

[0074] The terminals on adjacent terminal groups are the terminals on the positive and negative busbars, respectively. They are connected by connecting pieces 50 with connecting holes. The connecting pieces 50 are made of copper and have a zinc-plated outer layer. The connecting pieces 50 and the terminals are welded using an automatic soldering machine. One connecting piece 50 connects a pair of terminals with opposite polarities. A total of six connecting pieces 50 are welded. The welded "weld package 70" is full, firm, and beautiful, and its height will not protrude from the bottom surface where the convex ring 12 is located, so as not to affect the stable placement of the lead-acid battery.

[0075] After the connecting piece 50 and the terminal post are fully welded, the exposed bottom weldment 70, connecting piece 50, etc. are sealed with rubber waterproof suction cups 80. Each rubber waterproof suction cup 80 covers the bottom connecting piece 50, sealing groove 11, weldment 70, etc. of the lead-acid battery. The bottom edge of the rubber waterproof suction cup 80 is close to the bottom of the battery compartment 10, which helps to isolate the inside and outside of the suction cup, so that cooling water will not enter the rubber waterproof suction cup 80 during the formation process, thus ensuring the formation quality of the lead-acid battery.

[0076] After the formation process is complete, 80 ABS protective sleeves can be used to replace the rubber waterproof suction cups outside the welding area to avoid the risk of short circuits and wear in the welding area at the bottom of the lead-acid battery during use.

[0077] Example 4

[0078] like Figure 10 As shown, the manufacturing method of a lead-acid battery with multiple tabs at both ends of the electrode plate is described. In this embodiment, the electrode group consists of electrode plates 20 with one tab 21 at the top and one at the bottom, and is axially symmetrical. The structure of the electrode plate 20 is as follows: Figure 10 As shown.

[0079] All positive and negative plates and separators are assembled into an electrode group. The negative plate is covered by a single separator stacking method. The perimeter of the separator extends more than 4mm beyond the perimeter of the negative plate to avoid short circuits between the positive and negative plates. After the arrangement is completed, the tabs 21 of adjacent electrode groups are arranged with alternating polarities. The tabs 21 at the top of the electrode group are arranged in two rows, and the tabs 21 at the bottom of the electrode group are arranged in two rows to form an electrode group.

[0080] The electrode groups are cast and welded. After casting and welding, each electrode group has a positive and a negative busbar at the top and bottom. The different polarity busbars at the top and bottom of each electrode group are centrally symmetrical about the electrode group, and the polarity of the electrode group busbars is opposite to that of the adjacent electrode group busbars. The top busbars are cast and welded to the adjacent polarity busbars to form a connector, which is integrally formed. The bottom electrode group busbars are cast and welded to form a single connecting column, which is not connected to the adjacent busbars for the time being.

[0081] The bottom of the battery compartment 10 is provided with twelve sealing grooves 11. Sealant 60 is injected into the twelve sealing grooves 11. The amount of sealant injected into a single sealing groove 11 is 4-5g. Within 3 minutes after the sealant is injected into the sealing groove 11, the electrode groups are placed into the groove. Each electrode group is placed into the bottom of the battery compartment 10 according to the process requirements. After the insertion, each connecting post is completely immersed in the sealant 60 in the corresponding sealing groove 11. After the insertion is completed, the sealant is injected into the glue groove of the battery compartment 10. After the glue is injected, the top cover and the battery compartment 10 are closed. After the battery cover and the battery compartment 10 are closed, they can be put into the curing kiln for heating at the same time to accelerate the curing of the sealant 60 in the battery.

[0082] After curing, the lead-acid battery is inverted with the bottom of the battery compartment 10 facing upwards. A milling machine is used to mill the sealing groove 11 of the lead-acid battery. After milling, the sealant 60 inside the sealing groove 11 is bonded between the terminal post and the inner wall of the sealing groove 11, keeping the sealant 60 sealing the bottom of the battery compartment 10. The terminal post extends out of the sealing groove 11 in a "convex" shape, with the top of the terminal post exposed outside the sealant 60.

[0083] The terminals on adjacent terminal groups are the terminals on the positive and negative busbars, respectively. They are connected by connecting pieces 50 with connecting holes. The connecting pieces 50 are made of copper and have a zinc-plated outer layer. The connecting pieces 50 and the terminals are welded using an automatic soldering machine. One connecting piece 50 connects a pair of terminals with opposite polarities. A total of six connecting pieces 50 are welded. The welded "weld package 70" is full, firm, and beautiful, and its height will not protrude from the bottom surface where the convex ring 12 is located, so as not to affect the stable placement of the lead-acid battery.

[0084] After all the connecting pieces 50 and the pole posts are completely welded, rubber waterproof suction cups 80 are used to seal the exposed welding packages 70, connecting pieces 50, etc. at the bottom. Each single rubber waterproof suction cup 80 separately covers the connecting piece 50 at the bottom of the lead-acid battery, the sealing groove 11, the welding package 70 and other areas. The bottom edge of the rubber waterproof suction cup 80 closely adheres to the bottom of the battery case 10, which is beneficial for the rubber waterproof suction cup 80 to isolate the inside and outside of the suction cup, so that the cooling water will not enter the rubber waterproof suction cup 80 during the formation process, ensuring the formation quality of the lead-acid battery;

[0085] After the formation is completed, an ABS protective sleeve can be used to replace the rubber waterproof suction cup 80 and be sleeved outside the welding area to avoid the risk of short circuit and wear in the bottom welding area of the lead-acid battery during use.

[0086] Example 5

[0087] As Figure 11-14 shown, a preparation method of a lead-acid battery with multi-pole ears designed at both ends of the electrode plate. In this example, the electrode group is composed of electrode plates 20 with two pole ears 21 at the top and bottom ends and centrosymmetric. The structure of the electrode plate 20 is as Figure 11 shown.

[0088] All the positive and negative electrode plates and separators are assembled into an electrode group, and the negative electrode plate is coated by using the method of single-piece separator stacking and wrapping. The four peripheral edges of the separator exceed the four peripheral edges of the coated negative electrode plate by more than 4 mm to avoid short circuit between the positive and negative electrode plates. After the arrangement is completed, the pole ears 21 between adjacent electrode groups are arranged with alternating polarities, and the pole ears 21 at the top end of the electrode group are arranged in two rows, and the pole ears at the bottom end of the electrode group are arranged in two rows, forming an electrode group set;

[0089] The electrode group set is subjected to cast welding. After cast welding, there is one positive and one negative busbar at the top and bottom ends of each electrode group. The busbars on the two pole ears 21 with the same polarity at the top end of the electrode group set are connected in parallel to form a "C" shape, and the busbars with different polarities of adjacent electrode groups are connected in series and integrally formed; the pole ears 21 on each electrode group at the bottom end of the electrode group set are separately cast welded into a "one" shaped "busbar", and the busbar of each electrode group is not connected to the busbars of other electrode groups. A total of twenty-four busbars are cast welded at the bottom, and a connecting column is designed on each busbar;

[0090] The bottom of the battery compartment 10 is provided with twenty-four sealing grooves 11. Sealant 60 is injected into the twenty-four sealing grooves 11. The amount of sealant injected into a single sealing groove 11 is 4-5g. Within 3 minutes after the sealant is injected into the sealing groove 11, the electrode groups are placed into the groove. Each electrode group is placed into the bottom of the battery compartment 10 according to the process requirements. After the insertion, each connecting post is completely immersed in the sealant 60 in the corresponding sealing groove 11. After the insertion is completed, the sealant is injected into the glue tank of the battery compartment 10. After the glue is injected, the top cover and the battery compartment 10 are closed. After the battery cover and the battery compartment 10 are closed, they can be put into the curing kiln for heating at the same time to accelerate the curing of the sealant 60 in the battery.

[0091] After curing, the lead-acid battery is inverted with the bottom of the battery compartment 10 facing upwards. A milling machine is used to mill the sealing groove 11 of the lead-acid battery. After milling, the sealant 60 inside the sealing groove 11 is bonded between the terminal post and the inner wall of the sealing groove 11, keeping the sealant 60 sealing the bottom of the battery compartment 10. The terminal post extends out of the sealing groove 11 in a "convex" shape, with the top of the terminal post exposed outside the sealant 60.

[0092] The terminals on adjacent terminal groups are the terminals on the positive and negative busbars, respectively. They are connected by connecting pieces 50 with connecting holes. The connecting pieces 50 are made of copper and have a zinc-plated outer layer. The connecting pieces 50 and the terminals are welded using an automatic soldering machine. One connecting piece 50 connects a pair of terminals with opposite polarities. A total of twelve connecting pieces 50 are welded. The welded "weld package 70" is full, firm, and beautiful, and its height will not protrude from the bottom surface where the convex ring 12 is located, so as not to affect the stable placement of the lead-acid battery.

[0093] After the connecting piece 50 and the terminal post are fully welded, the exposed bottom weldment 70, connecting piece 50, etc. are sealed with rubber waterproof suction cups 80. Each rubber waterproof suction cup 80 covers the bottom connecting piece 50, sealing groove 11, weldment 70, etc. of the lead-acid battery. The bottom edge of the rubber waterproof suction cup 80 is close to the bottom of the battery compartment 10, which helps to isolate the inside and outside of the suction cup, so that cooling water will not enter the rubber waterproof suction cup 80 during the formation process, thus ensuring the formation quality of the lead-acid battery.

[0094] After the formation process is complete, 80 ABS protective sleeves can be used to replace the rubber waterproof suction cups outside the welding area to avoid the risk of short circuits and wear in the welding area at the bottom of the lead-acid battery during use.

Claims

1. A lead-acid battery with a multi-tab design at both ends of the electrode plates, comprising a battery case and a battery cover that overlap each other, wherein the battery case is divided into multiple compartments, each compartment having a group of electrodes, the group of electrodes comprising alternating positive and negative electrode plates, with a partition between adjacent positive and negative electrode plates, each positive electrode plate having a positive tab at its upper and lower ends, and each negative electrode plate having a negative tab at its upper and lower ends, the positive tabs in the same end and row of each group of electrodes being connected by a positive busbar, the positive busbar having a positive terminal, and the negative tabs in the same end and row of each group of electrodes being connected by a negative busbar, the negative busbar having a negative terminal, the positive and negative terminals being connected in series between adjacent groups of electrodes, and a positive terminal and a negative terminal located at the beginning and end of the top surface of the lead-acid battery serving as the positive and negative terminals of the lead-acid battery, characterized in that... The inner bottom surface of the battery compartment has a downward-protruding sealing groove for accommodating the positive and negative terminals of the electrode group. When the electrode group is inserted into the groove, the sealing groove is filled with sealant. After the electrode group is inserted into the groove, the positive and negative terminals extend into the sealing groove and the sealant is cured. After curing, part of the sealing groove and sealant is removed from the outside of the bottom surface of the battery compartment to expose the positive and negative terminals located in the sealing groove. Then, connecting pieces are used to pair and connect the positive and negative terminals on adjacent electrode groups in series.

2. The lead-acid battery with a multi-tab design at both ends of the electrode plate according to claim 1, characterized in that, The connecting piece includes two connecting holes that are respectively fitted to the positive terminal and the negative terminal, and the connecting piece is connected to the positive terminal and the negative terminal by welding.

3. The lead-acid battery with a multi-tab design at both ends of the electrode plate according to claim 1, characterized in that, Each of the connecting pieces and the pair of positive and negative terminals exposed outside the battery compartment connected in series with the connecting piece are waterproofed and sealed with rubber waterproof suction cups during formation. After formation, the rubber waterproof suction cups are replaced with plastic protective sleeves.

4. The lead-acid battery with a multi-tab design at both ends of the electrode plate according to claim 3, characterized in that, The four side walls of the battery compartment extend towards the bottom to form a raised ring, and the rubber waterproof suction cup or plastic protective cover does not protrude from the bottom surface of the raised ring after installation.

5. The lead-acid battery with a multi-tab design at both ends of the electrode plate according to claim 1, characterized in that, The amount of sealant injected into the sealing groove is such that it does not overflow outside the sealing groove after the electrode group enters the groove.

6. The lead-acid battery with a multi-tab design at both ends of the electrode plate according to claim 1, characterized in that, The positive tabs at both ends of the positive plate are either centered or offset to one side; similarly, the negative tabs at both ends of the negative plate are either centered or offset to one side.

7. The lead-acid battery with a multi-tab design at both ends of the electrode plate according to claim 1, characterized in that, The positive electrode plate has 1 to 3 positive tabs at both its upper and lower ends. In each electrode group, the positive tabs arranged in a row on all the positive electrode plates are connected by the same positive busbar. The negative electrode plate has 1 to 3 negative tabs at both its upper and lower ends. In each electrode group, the negative tabs arranged in a row on all the negative electrode plates are connected by the same negative busbar.

8. The lead-acid battery with a multi-tab design at both ends of the electrode plate according to claim 1, characterized in that, The bottom surface of the battery compartment is also provided with a groove for accommodating the positive and negative busbars, and the groove is connected to the sealing groove; the length and width of the groove are both 2-3 mm greater than the length and width of the positive or negative busbars that are adapted to it; the sum of the depth of the sealing groove and the depth of the groove is 1-2 mm greater than the depth of the positive busbar and positive terminal or the negative busbar and negative terminal.

9. The lead-acid battery with multiple tabs at both ends of the electrode plate according to claim 1, characterized in that, The bottom of the sealing groove is made of ABS material.

10. A method for manufacturing a lead-acid battery with multiple tabs at both ends of the electrode plate, characterized in that, The preparation of a lead-acid battery with a multi-tab design at both ends of the electrode plate as described in any one of claims 1 to 9 includes the following steps: (1) Assemble the positive electrode plate, negative electrode plate and separator into an electrode group; (2) The positive electrode bus, positive electrode post and negative electrode bus, negative electrode post are formed by casting and welding. The positive electrode tabs located at the same end and in the same row in the electrode group are connected by the positive electrode bus, and the positive electrode post is provided on the positive electrode bus. The negative electrode tabs located at the same end and in the same row in the electrode group are connected by the negative electrode bus, and the negative electrode post is provided on the negative electrode bus. (3) Add sealant to the sealing groove on the bottom of the battery case, insert the electrode group into the groove, and each positive and negative electrode post extends into the corresponding sealing groove. (4) The sealant has cured; (5) After the sealant has cured, remove part of the sealing groove and sealant from the outside of the bottom of the battery compartment to expose the positive and negative terminals located in the sealing groove, and use connecting pieces to connect the positive and negative terminals on adjacent electrode groups in series by welding. (6) After installing the battery cover and filling it with electrolyte, the battery is formed. Before the formation, each of the connecting pieces and the pair of positive and negative terminals exposed outside the battery compartment are sealed with a rubber waterproof suction cup. After the formation is completed, the rubber waterproof suction cup is replaced with a plastic protective sleeve.

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