Grid of lead-acid battery and lead-acid battery

Abstract

The present invention relates to a grid of a lead-acid battery and a lead-acid battery. The grid comprises: a grid-shaped current collector, the grid-shaped current collector comprises a plurality of first ribs extending in a predetermined direction and a pole ear, the pole ear being connected to the first ribs; and a frame, the frame comprising a plurality of support bars and a frame connected together, the first ribs intersecting the support bars, the same ends of a plurality of first ribs being fastened to the bottom edge of the frame respectively, the first ribs being at least partially embedded in the support bars, the grid-shaped current collector being connected to the frame to form a grid structure in the middle of the grid, and the density of the frame being less than the density of the grid-shaped current collector.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and more specifically, to a grid of a lead-acid battery and a lead-acid battery. Background Art

[0002] Lead-acid batteries have the advantages of high safety and recyclability. The plates of lead-acid batteries are usually divided into tubular plates and plate plates. Plate plates are widely used in lead-acid batteries because of their thinner thickness and lower resistivity. The main disadvantage of plate plates is that they make the specific energy of lead-acid batteries lower.

[0003] Lead and lead alloys are the main materials for the plates in ordinary lead-acid batteries. Lead is a heavy metal element with a density of up to 11.34g / cm 3 The invention patent application with application number CN201210107216.9 discloses a technical solution of using copper mesh as the main material of the current collector of the lead-acid battery grid. In order to prevent copper from being corroded by the sulfuric acid electrolyte in the lead-acid battery, a layer of lead still needs to be coated on the surface of the copper mesh grid to be used as the lead-acid battery grid.

[0004] There are two major uses for lead in lead-acid batteries. One is the lead material that is produced by a series of processes and finally through electrochemical reactions to generate positive and negative active materials. The main component of the positive active material is lead dioxide, and the main component of the negative active material is sponge lead. The other type of lead and lead alloy is used as a material for current collectors such as grids, buses, and terminals. The main function of this part of lead is to collect the charge and discharge charges of the active material, and as a conductor to input or output the charge from the battery, assisting the active material of the lead-acid battery to complete the charging and discharging process. The amount of this part of lead and lead alloy has no substantial change on the energy output capacity of the battery. Therefore, the way to increase the specific energy of lead-acid batteries generally includes replacing metal lead with a low-density material as the current collector of the active material or changing the formula of the lead paste to increase the specific energy by increasing the utilization rate of the active material.

[0005] The invention patent application with application number CN201510208608.8 discloses a method of using a composite current collector as a substrate to replace the traditional lead grid to improve the specific energy of a lead-acid battery. In order to avoid corrosion of the current collector in an acidic environment, the invention content requires coating a conductive adhesive transition layer and a conductive anti-corrosion layer on the surface of the substrate; the invention patent application with application number CN201610017413.X discloses an easily formed high-specific-energy lead-acid battery, and the apparent density of the positive lead paste is 4.0-4.15 g / cm 3 The density of negative lead paste is reduced to 4.1-4.15g / cm 3The apparent density of the positive and negative electrode lead paste is 5%-15% lower than that of the positive and negative electrode lead paste of ordinary lead-acid batteries. The low apparent density lead paste has a higher porosity, thereby improving the utilization rate of active materials in the positive and negative electrodes and increasing the specific energy of the battery.

[0006] The invention patent application with application number CN201510630972.3 discloses a method for manufacturing a high specific energy lead-acid battery, which improves the oxidation degree of lead powder by reducing the mass of the grid, improves the utilization rate of active materials by adding conductive carbon fiber and graphene to the lead paste, and improves the specific energy of the lead-acid battery by reducing the mass of inactive materials.

[0007] The invention patent application with application number CN201510940669.3 discloses a structure in which the first horizontal ribs and the first vertical ribs are perpendicular to each other, and the first vertical ribs are extended into pole ears; the invention patent application with application number CN200680017715.1 discloses a battery grid structure in which the first vertical ribs are not perpendicular to the first horizontal ribs, and the first vertical ribs are biased toward the position of the pole ears; the invention patent application with application number CN201310289855.6 discloses a grid with an extended mesh structure, in which the grid does not distinguish between the first horizontal ribs and the first vertical ribs, and the first ribs that cross each other vertically and horizontally are at a certain angle to the current direction in the pole ears, and the grid has no vertical frame.

[0008] The existing grid usually includes first ribs formed of the same metal material, such as first horizontal ribs and first vertical ribs. The potential on the same first horizontal rib is similar during the charge and discharge process of the lead-acid battery. The current density passing through the first horizontal rib is much smaller than the current density in the first vertical rib. The first horizontal rib exists to maintain the structural stability of the grid. The first horizontal ribs and the first vertical ribs are interwoven into a mesh grid, and the grid is filled with positive and negative lead pastes to form the positive and negative plates of the lead-acid battery. This type of grid has a large mass and a small energy storage mass ratio, which is not conducive to the lightweighting of electronic products.

[0009] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0010] An object of the present invention is to provide a new technical solution for the grid of a lead-acid battery.

[0011] According to one aspect of the present invention, a grid of a lead-acid battery is provided. The grid comprises: a grid-shaped current collector, the grid-shaped current collector comprises a plurality of first ribs extending in a predetermined direction and a tab, the tab being connected to the first rib; and a frame, the frame comprising a plurality of support bars and a frame connected together, the first ribs intersecting the support bars, the same ends of the plurality of first ribs being fastened to the bottom edge of the frame respectively, the first ribs being at least partially embedded in the support bars, the grid-shaped current collector being connected to the frame to form a grid structure in the middle of the grid, and the density of the frame being less than the density of the grid-shaped current collector.

[0012] Optionally, a plurality of the first ribs extend at the same end and are connected together to form a collection portion, a terminal end of the collection portion forms the pole lug, and a portion of the collection portion other than the pole lug forms the second rib.

[0013] Optionally, the lengths of the plurality of first ribs are equal, and the collection portion protrudes outward from the frame along the extension direction of the first ribs; or

[0014] The pole lug protrudes outward from the frame along the extending direction of the first rib, and the second rib is located in the area surrounded by the frame.

[0015] Optionally, a plurality of the first ribs extend out of the frame at the same end, and the portion extending out of the frame forms the pole lug.

[0016] Optionally, the plurality of first ribs are divided into a first part and a second part and a conductive part between the first part and the second part along the extension direction, a first electrode active material is attached to the first part, a second electrode active material is attached to the second part, the conductive part forms the pole ear, and the first part and the second part share the pole ear.

[0017] Optionally, there are multiple first ribs and multiple support bars, each of the first ribs is connected to all of the support bars, and each of the support bars is connected to all of the first ribs.

[0018] Optionally, the frame includes a first frame and a second frame that are arranged opposite to each other, the grid-shaped current collector is located between the first frame and the second frame, and the grid-shaped current collector is embedded in the first frame and the second frame.

[0019] Optionally, the first frame and the second frame are both made of plastic and are connected together by ultrasonic welding, and energy conducting ribs are formed at locations of the first frame or the second frame corresponding to gaps between the plurality of first ribs.

[0020] Optionally, the frame is integrally formed, the support bar is provided with a plurality of open grooves in the extension direction of the support bar, a portion of the plurality of open grooves has an opening direction opposite to that of the remaining portions, and a plurality of the first ribs are respectively inserted into the plurality of open grooves.

[0021] Optionally, a groove is provided at a location where the frame is connected to the electrode active material.

[0022] Optionally, a cap protruding from the first ribs or a bottom rib for connecting two adjacent first ribs is provided at one end of the plurality of first ribs opposite to the pole lug, and the cap cap or the bottom rib is embedded in the bottom edge of the frame.

[0023] Optionally, the frame is made of plastic, rubber, resin, fiber, ceramic or glass.

[0024] Optionally, the grid-shaped current collector is made of lead or lead alloy, or lead coated with copper wire or aluminum wire.

[0025] Optionally, the grid-shaped current collector is formed by bending a metal wire, integrally stamping, or casting.

[0026] According to another aspect of the present disclosure, a lead-acid battery is provided. The battery includes: a battery tank, a cavity is formed in the battery tank, one or more battery cells are arranged in the cavity, the battery cells include a positive plate, a negative plate and a separator located between the positive plate and the negative plate, the positive plate and the negative plate include the grid provided by the present invention, the tabs of the plurality of positive plates are electrically connected, and the tabs of the plurality of negative plates are electrically connected.

[0027] Optionally, a busbar is further included, the busbar having a plurality of groups of first clamping plates and second clamping plates arranged opposite to each other, the pole lugs are clamped between the first clamping plates and the second clamping plates, and the plurality of positive plates and the plurality of negative plates are electrically connected through their respective busbars.

[0028] Optionally, the cavity forms a plurality of isolated chambers arranged side by side, and a battery cell is arranged in each isolated chamber; the plurality of battery cells are connected in series, and two adjacent battery cells are connected in series through the shared bus bar.

[0029] Optionally, a battery cover is further included, wherein a sealing glue groove is provided on the battery cover, and the sealing glue filled in the sealing glue groove seals the bus bar in the battery cover.

[0030] Optionally, the busbar is made of copper and copper alloy or aluminum and aluminum alloy.

[0031] According to the third aspect of the present disclosure, a lead-acid battery is provided. The battery comprises: a battery slot, a plurality of isolation chambers in the battery slot, a battery cell is arranged in the isolation chamber, the battery cell comprises a positive plate, a negative plate and a partition between the positive plate and the negative plate, the battery cells in two adjacent isolation chambers share the grid provided by the present invention, and the one with a higher potential among the two adjacent battery cells is defined as the first battery cell, and the one with a lower potential is defined as the second battery cell, wherein the first part of the grid is located in the isolation chamber where the first battery cell is located, serving as the negative electrode of the first battery cell; the second part of the grid is located in the isolation chamber where the second battery cell is located, serving as the positive electrode of the second battery cell, and the shared pole ear is located in the isolation wall between the two isolation chambers.

[0032] One technical effect of the present invention is that the first rib of the grid has a current collecting function. The support bar crosses and is connected with the first rib to form a grid structure. The support bar plays a role of structural support. The grid structure is used to attach the electrode active material. For example, the electrode active material is lead paste. During production, the lead paste is coated or pressed on the grid structure. The density of the frame is less than the density of the grid-like current collector, and the grid has the characteristics of light weight.

[0033] In addition, since multiple first ribs are evenly distributed in each support bar, the current density of the first ribs near any support bar is evenly distributed, and even each first rib has a connected pole ear, which can effectively prevent the grid from having excessive local temperature due to excessive local current.

[0034] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0036] Figure 1 Schematic diagram of the structure of a grid plate according to an embodiment of the present disclosure.

[0037] Figure 2 yes Figure 1 A partial enlarged view along line AA in the middle.

[0038] Figure 3 yes Figure 1 A partial enlarged view along line BB in the middle.

[0039] Figure 4 yes Figure 1 Schematic diagram from another angle.

[0040] Figure 5-6 Schematic diagram of the structure of a grid-shaped current collector according to an embodiment of the present disclosure.

[0041] Figure 7 It is a schematic diagram of the structure of a framework according to an embodiment of the present disclosure.

[0042] Figure 8 It is a schematic diagram of the structure of a second framework according to an embodiment of the present disclosure.

[0043] Fig. 9 is a schematic structural diagram of a second grid plate according to an embodiment of the present disclosure.

[0044] Fig.10 is a schematic structural diagram of a third grid-shaped current collector according to an embodiment of the present disclosure.

[0045] Fig.11 is a schematic structural diagram of a third grid plate according to an embodiment of the present disclosure.

[0046] Fig.12 is a schematic structural diagram of a fourth grid-shaped current collector according to an embodiment of the present disclosure.

[0047] Fig.13 is a schematic structural diagram of a fifth grid-shaped current collector according to an embodiment of the present disclosure.

[0048] Fig.14 It is a structural schematic diagram of a battery cell provided with a first bus connection according to an embodiment of the present disclosure.

[0049] Fig.15 It is a schematic diagram of a structure in which a second bus connection is arranged on a battery cell according to an embodiment of the present disclosure.

[0050] Fig.16 Schematic diagram of the structure of a lead-acid battery according to an embodiment of the present disclosure.

[0051] Fig.17 is a schematic diagram of the structure of a bus according to an embodiment of the present disclosure.

[0052] Fig.18 It is a schematic top view of the structure in which a first bus connection is arranged between lead-acid battery cells according to an embodiment of the present disclosure.

[0053] Fig.19 It is a schematic cross-sectional structure diagram of each first rib extending out of the frame to form a plurality of pole tab grids according to an embodiment of the present disclosure.

[0054] Fig. 20It is a schematic diagram of a cross-sectional structure of a bipolar grid formed by dividing a first rib into a first part and a second part according to an embodiment of the present disclosure.

[0055] Fig.21 is based on Fig. 20 Schematic diagram of the bipolar plate structure made of bipolar grid.

[0056] Fig. 22 Schematic diagram of the structure of a lead-acid battery according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0057] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0058] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0059] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0060] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0061] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0062] According to one embodiment of the present disclosure, a grid of a lead-acid battery is provided. Figure 1 As shown, the grid includes: a grid-shaped current collector and a frame. For example, the overall thickness of the grid is 0.5 mm-12 mm. The thickness is the dimension perpendicular to the main surface of the grid.

[0063] The grid-shaped current collector is used for current collection. The grid-shaped current collector includes a second rib 103a, a plurality of first ribs 101 extending in a predetermined direction, and a pole lug 102. For example, the extension direction of the plurality of first ribs 101 is parallel to the predetermined direction or substantially parallel to the predetermined direction. The cross-section of the first rib 101 is circular, semicircular, elliptical, trapezoidal, triangular, rectangular, etc. For example, a plurality of the first ribs 101 extend at the same end and are connected together to form a collection portion 103. The end of the collection portion 103 forms the pole lug 102, and the portion of the collection portion 103 other than the pole lug 102 forms the second rib 103a.

[0064] The same end of the plurality of first ribs 101 is respectively connected to different parts of the second rib 103a. For example, the second rib 103a is parallel to the horizontal direction, and the first rib 101 is parallel to the vertical direction. There are one or two second ribs 103a. One end of the plurality of first ribs 101 is respectively connected to the second rib 103a, or the two ends of the plurality of first ribs 101 are respectively connected to two second ribs 103a. For example, the grid-shaped current collector is rectangular as a whole. Connection at different parts means that the plurality of first ribs 101 are arranged in sequence along the extension direction of the second rib 103a, and the plurality of second ribs 103a do not intersect at one point.

[0065] The pole ear 102 is connected to the second rib 103a. Fig.12 , 13 As shown, the tab 102 is connected to the second rib 103a, and is connected to the tab 102 via the second rib 103a. Figure 5 , 6 As shown in FIG. 10 , the tab 102 leads to a plurality of wires to be connected to the plurality of first ribs 101 respectively. The plurality of wires together form the second rib 103a. For example, the thickness of the tab 102 is 0.2 mm to 8 mm. This thickness range ensures that the tab has sufficient structural strength.

[0066] Optionally, the grid-shaped current collector is made of lead or lead alloy; or lead coated with copper wire or aluminum wire. The above materials have good electrical conductivity and sulfuric acid corrosion resistance. In other examples, lead coated with other high-strength fiber wires is also included to improve strength.

[0067] The frame includes a plurality of support bars 201 connected together. Figure 7-8 As shown, the frame also includes a frame enclosed together. The frame includes a top frame 202 located at the top, a bottom frame 204 located at the bottom, and two side frames 203 located between the top frame 202 and the bottom frame 204. The frame is rectangular in shape. The two ends of the support bar 201 are respectively connected to the two side frames 203. The support bar 201 is parallel to the top frame 202.

[0068] like Figure 1 , 4 As shown, the first rib 101 crosses the support bar 201. At least part of the first rib 101 is embedded in the support bar 201. The grid-like current collector is connected to the frame to form a grid structure in the middle of the grid. The density of the frame is less than the density of the grid-like current collector.

[0069] In one example, the density of the frame is less than or equal to 5 g / cm 3 The density is much lower than that of lead and lead alloy, so that the mass of the grid is effectively reduced. For example, the frame is made of plastic, rubber, resin, fiber, ceramic or glass. The above materials are resistant to acid corrosion. For example, the frame is formed by injection molding.

[0070] For example, the thickness of the frame is 0.5 mm to 12 mm, which makes the structural strength of the frame high.

[0071] In this example, the first ribs 101 of the grid have a current collecting function. The support bars 201 cross and connect with the first ribs 101 to form a grid structure. The support bars 201 play a role of structural support. The grid structure is used to attach the electrode active material. For example, the electrode active material is lead paste. During production, the lead paste is coated or pressed onto the grid structure. The pole lug 102 is located at the same end of the extension direction of the plurality of first ribs 101.

[0072] In addition, since the same end of the plurality of first ribs 101 is respectively connected to different parts of the second rib 103a, the current distribution in each part of the grid is uniform, which can effectively prevent the grid from having a local overtemperature due to excessive local current.

[0073] The inventors of the present invention have discovered that the existing grids are all made of the same metal material, such as lead, lead alloy, etc., which form a grid structure in a criss-cross pattern. However, since the pole ear 102 is located at one end of the grid, such as one end of the longitudinal rib, where the longitudinal direction is the vertical direction. During operation, the current in the longitudinal ribs and the transverse ribs is not uniform. The current in the longitudinal ribs is much larger than the current in the transverse ribs, where the transverse direction is the horizontal direction. The transverse ribs mainly play a role of structural support. In an embodiment of the present invention, the transverse ribs are replaced with a material with a low density (such as the support bar 201). On the one hand, it can still ensure a good current collection effect for the grid, and on the other hand, it can effectively reduce the overall mass of the grid and improve the energy storage mass ratio of the lead-acid battery.

[0074] In an example, Figure 5As shown, the grid-like current collector includes a metal wire wound in a circuitous manner. The portion of the metal wire extending along the main direction is the plurality of first ribs 101. The main direction is consistent with the extension direction of the first ribs 101. For example, the metal wire is a lead wire, a lead alloy wire, etc. Starting from one end of the metal wire, it is repeatedly wound to form a grid-like current collector with a planar structure. Preferably, the plurality of first ribs 101 are parallel to each other and have equal spacing. This makes the current of the grid more uniform.

[0075] The winding molding method makes the grid-shaped current collector easy to process and manufacture, with low processing cost and high processing precision, and is suitable for large-scale production.

[0076] In addition, this processing method does not require the separate provision of components such as the second rib 103 a and the tab 102 .

[0077] In an example, Figure 1 , 4 , 5, and 6. A plurality of the first ribs 101 extend at the same end and are assembled together to form a collection portion 103. The end of the collection portion 103 forms the pole ear 102. The portion of the collection portion 103 other than the pole ear 102 forms the second rib 103a. For example Figure 6 As shown, the end of the collection portion 103 is extruded to form a pole ear 102 of a predetermined shape to facilitate connection with a busbar.

[0078] In an example, Figure 1 As shown, the lengths of the plurality of first ribs 101 are equal. For example, the first ribs 101 are parallel to the long sides of the rectangle. The collection portion 103 protrudes outward from the frame along the extension direction of the first ribs 101. For example, the collection portion 103 protrudes from the top frame 202. In this example, the lengths of the first ribs 101 are equal, and the reaction areas of the plurality of plates formed after coating the electrode active material are equal, thereby ensuring the reliability of the plates.

[0079] It can also be, Figure 10-11 As shown, the tab 102 protrudes outward from the frame along the extension direction of the first rib 101. The portion of the frame other than the tab 102 is located within the area surrounded by the frame. For example, this portion is located within the top frame 202, and only the tab 102 protrudes from the top frame 202. This arrangement can reduce the embedding of electrode active materials into the grooves of the second ribs 103a during the coating process, and also reduces the risk of short circuits between the second ribs 103a of adjacent plates.

[0080] In other examples, the grid-shaped current collector is formed by stamping (eg Fig.12 as shown) or cast (as Fig.13As shown in FIG. 1 ). The second rib 103a, the first rib 101, and the tab 102 are integrally formed and do not need to be connected separately. The above-mentioned forming methods can form an integrated grid-shaped current collector, which is suitable for large-scale production.

[0081] In an example, Figure 4 As shown, the frame includes a first frame 209 and a second frame 210 that are arranged opposite to each other. The grid-shaped current collector is located between the first frame 209 and the second frame 210. The grid-shaped current collector is embedded in the first frame 209 and / or the second frame 210.

[0082] For example, the first frame 209 and the second frame 210 both include a frame and a support bar 201 located in the frame. A recessed structure 205 is formed on the first frame 209 and / or the second frame 210. During installation, the second rib 103a and the first rib 101 of the grid-shaped current collector are inserted into the recessed structure 205. The first frame 209 and the second frame 210 are fixedly connected together in a front-facing manner. In this example, the first frame 209 and the second frame 210 can effectively protect the grid-shaped current collector.

[0083] In an example, Figure 7 As shown, the first frame 209 and the second frame 210 are both made of plastic and connected together by ultrasonic welding. Energy conducting ribs 206 are formed at the positions corresponding to the gaps between the frames around the second frame 210 and the plurality of first ribs 101. The energy conducting ribs 206 are strip-shaped protrusions protruding outward in the direction of the contact surface with the frame 209. The energy conducting ribs 206 are located on the frames and the support bars 201. The cross-section of the energy conducting ribs 206 is triangular, trapezoidal, etc. When ultrasonic welding is performed, energy is concentrated on the energy conducting ribs 206, so that the energy conducting ribs 206 melt quickly. The energy conducting ribs 206 effectively improve the welding quality and welding speed of the first frame 209 and the second frame 210.

[0084] In an example, Figure 8-9 As shown, the support bar 201 is provided with a plurality of open grooves in the extension direction of the support bar 201. A part of the plurality of open grooves has an opening direction opposite to that of the rest. For example, the opening direction of the first open groove 205a is toward one surface of the frame. The opening direction of the second open groove 205b is toward another surface of the frame. The plurality of the first ribs 101 are respectively inserted into the plurality of the open grooves. That is, a part of the first ribs 101 is inserted into the first open groove 205a, and another part of the first ribs 101 is inserted into the second open groove 205b. This arrangement enables the frame to be clamped between the plurality of first ribs 101, and the structural strength of the grid is high.

[0085] For example, the opening groove is circular. The diameter of the circle is equivalent to the diameter of the first rib 101. The size of the opening end of the opening groove is 1.5 times to 1.8 times the radius of the opening groove. Since the size of the opening end is smaller than the diameter of the first rib 101, the first rib 101 can be effectively prevented from detaching from the opening groove.

[0086] In one example, the opening directions of adjacent opening grooves are opposite. In this example, the plurality of first ribs 101 are arranged in the first opening groove 205a and the second opening groove 205b at intervals, which makes the clamping effect of the plurality of first ribs 101 on the frame stronger.

[0087] In one example, the plurality of first ribs 101 are located on different planes. For example, the first ribs 101 located in the plurality of first opening grooves 205a are on the same plane, and the first ribs 101 located in the second opening grooves 205b are located on another plane. This arrangement makes full use of the space perpendicular to the main surface of the rectangle. Compared to the arrangement in which the plurality of first ribs 101 are all located in the same plane, this arrangement makes it less likely for the electrode active material to fall off and can be more firmly attached to the grid structure.

[0088] In one example, the thickness of the first rib 101 is 20% to 80% of the thickness of the support bar 201. Within this range, the support bar 201 has high structural strength, and the formed grid has high structural strength.

[0089] In one example, a limiting groove is provided on the top frame 202. The second rib 103a is inserted into the limiting groove. The limiting groove can effectively limit the position of the second rib 103a and prevent the second rib 103a from moving along the main surface.

[0090] In one example, the thickness of the first rib 101 is 25% to 100% of the thickness of the second rib 103a. In this example, the first rib 101 plays a role of structural support and requires strong structural strength. The thickness of the second rib 103a is greater than the thickness of the first rib 101, which can ensure that the current density from the second rib 103a to the tab 102 does not decrease.

[0091] In an example, Figure 5-7 As shown in 12-13, a cap head 104a protruding from the first rib 101 or a bottom rib 104b used to connect two adjacent first ribs 101 is provided at one end of the plurality of first ribs 101 opposite to the second rib 103a. The frame includes a bottom frame 204 connected to the plurality of support bars 201. A slot 208 is provided on the bottom frame 204. The cap head 104b or the bottom rib 104a is inserted into the slot 208.

[0092] In this example, by providing the bottom rib 104b, the cap head 104a and the slot 208 to cooperate with the second rib 103a, the position of the first rib 101 can be effectively limited to prevent the grid-shaped current collector from moving relative to the frame.

[0093] For example, the cap head 104a is perpendicular to both sides of the first rib 101. The cap head 104a and the first rib 101 form a T-shaped structure. For example, the cross-sectional area of ​​the cap head 104a is 1.5-5 times the cross-sectional area of ​​the first rib 101. This makes the fixation of the cap head 104a and the slot 208 more secure.

[0094] In one example, a groove is provided at the portion of the frame connected to the electrode active material. The groove can increase the contact area between the frame, the first rib 101 and the electrode active material, making the connection between the frame and the electrode active material more secure. Figure 2-3 As shown, the groove is formed as a first groove 207a in the direction of the through hole surrounded by the frame frame, the support bar 201 and the first rib 101, or a plurality of second grooves 207b with intervals are intermittently arranged on the contact surface of the frame frame and the support bar 201 with the electrode active material. The second groove 207b is perpendicular to the extension direction of the support bar or the frame bar. The cross section of the groove is triangular, rectangular, trapezoidal, semicircular, etc., and those skilled in the art can select according to actual needs.

[0095] In an example, Figure 20-20 As shown, a grid is divided into two areas. In this example, the plurality of first ribs 101 are divided into a first portion S1 and a second portion S2 and a conductive portion located between the first portion S1 and the second portion S2 along the extension direction. The extension direction is the direction in which the first rib 101 extends axially.

[0096] The first portion S1 is attached with a first electrode active material, and the second portion S2 is attached with a second electrode active material. That is, by arranging different electrode active materials in different portions, different electrodes are formed in different regions. For example, the first electrode active material is a positive electrode active material 301; the second electrode active material is a negative electrode active material 302. No electrode active material is attached to the conductive portion.

[0097] The conductive portion forms the tab 102, and the first portion S1 and the second portion S2 share the tab 102. The electrode where the first portion S1 is located and the electrode where the second portion S2 is located are connected through the shared tab 102. The overall structure is equivalent to two pieces Fig.19 The tabs 102 of the grid are shown connected together to form a common tab.

[0098] Fig.21Revealed Fig. 20 The grid shown is coated with positive electrode active material 301 and negative electrode active material 302 to form a bipolar plate structure.

[0099] When assembled into a lead-acid battery, the first part S1 and the second part S2 are used as electrodes of different battery cells. For example, the second part S2 and the negative electrode active material 302 are used as the negative electrode of a battery cell, and the first part S1 and the positive electrode active material 301 are used as the positive electrode of another battery cell adjacent to the above battery cell. In this way, the two battery cells are connected in series. Due to the existence of the shared pole ear 102, there is no need to set up a conducting element between the two battery cells for conduction.

[0100] In addition, the arrangement of the shared tabs 102 makes the connection between different battery cells more secure, and the overall strength of the lead-acid battery is higher.

[0101] It should be noted that one or more battery cells may be arranged in each isolation chamber. A plurality of battery cells arranged side by side may be connected in series through the bipolar plate in a manner of sequentially connecting the negative electrode and the positive electrode.

[0102] In one example, there are multiple first ribs 101 and multiple support bars 201, each of the first ribs 101 is connected to all the support bars 201, and each of the support bars 201 is connected to all the first ribs 101. This arrangement allows each first rib 101 to be connected to each support bar 201, and the structural strength of the grid is higher.

[0103] According to another embodiment of the present disclosure, a lead-acid battery is provided. Figure 14-16 As shown, the lead-acid battery includes: a battery slot A1, in which a cavity is formed. One or more battery cells are arranged in the cavity. The battery cell includes a positive plate B01, a negative plate B02, and a partition B03 located between the positive plate B01 and the negative plate B02. The partition B03 can prevent a short circuit between adjacent positive plates B02 and negative plates B01. The positive plate B01 and the negative plate B02 include the grid provided by the present invention. The tabs of the multiple positive plates B01 are electrically connected, and the tabs of the multiple negative plates B02 are electrically connected.

[0104] like Figure 14-16 As shown, the tabs of the multiple positive plates B02 after being electrically connected form the positive busbar of the battery cell. The tabs of the multiple negative plates B01 after being electrically connected form the negative busbar of the battery cell. The lead-acid battery has the characteristics of light weight and high energy storage weight ratio.

[0105] In an example, Fig.17As shown, the lead-acid battery cell also includes a busbar. The busbar has multiple groups of first clamping plates 401 and second clamping plates 402 arranged opposite to each other. For example, the busbar includes a connecting plate and multiple groups of first clamping plates 401 and second clamping plates 401 arranged in parallel on one surface of the connecting plate. The pole lug 102 is clamped between the first clamping plate 401 and the second clamping plate 402, and the multiple positive plates B01 and the multiple negative plates B02 are electrically connected through their respective busbars. The busbar connects the pole lugs of the positive plates B01 of the multiple battery cells of the battery cell in parallel, and connects the pole lugs of the multiple negative plates B02 in parallel. The two clamping plates 401, 402 can not only effectively clamp the pole lugs but also protect the pole lugs.

[0106] Optionally, the material of the return rail may be but is not limited to metal materials such as copper and aluminum.

[0107] In an example, Fig.18 As shown, the cavity forms a plurality of isolated chambers arranged side by side, for example, six. A battery cell is arranged in each isolated chamber. The battery cell includes the plurality of battery cells. The plurality of battery cells are connected in series. Two adjacent battery cells are connected in series through a common bus A3. For example, bus A3 spans the third isolated chamber and the fourth isolated chamber. Bus A31 spans the fourth isolated chamber and the fifth isolated chamber. In this example, the negative electrode of the third battery cell C3 and the positive electrode C4 of the fourth battery cell share a bus A3. The negative electrode of the fourth battery cell C4 and the positive electrode C5 of the fifth battery cell share a bus A31. This arrangement makes it easy to connect multiple battery cells in series.

[0108] In an example, Fig.16 As shown, a positive electrode column A6 and a negative electrode column A5 are provided outside the battery slot A1. The positive electrode column A6 is electrically connected to the bus bar as the positive electrode of the lead-acid battery through a metal sheet, and the negative electrode column A5 is electrically connected to the bus bar as the negative electrode of the lead-acid battery through a metal sheet.

[0109] In this example, the positive and negative electrodes of the assembled lead-acid battery are connected to the positive pole A6 and the negative pole A5 respectively provided outside the battery tank A1, so that the charge in the battery can be led to the outside of the battery tank A1 for connecting the wires when in use.

[0110] For example, Fig.15 As shown, when the frame material of the grid is a high temperature resistant material such as glass or ceramic, the tab 102, the pole B05 and the busbar can be welded together by a common welding technology, such as by cavity welding molding or casting molding. This arrangement can use the original lead-acid battery production equipment and process.

[0111] In one example, the lead-acid battery further comprises a battery cover, wherein the battery cover is provided with a sealant groove, and the sealant groove is filled with sealant to seal the busbar in the battery cover.

[0112] In this example, the busbar is sealed by sealing the straight opening of the battery slot A1 with sealant, which can prevent the busbar from being corroded by sulfuric acid in the lead-acid battery. The sealant plays a role in bonding the battery slot and the battery cover and protecting the busbar and other components.

[0113] According to a third embodiment of the present invention, a lead-acid battery is provided. Fig. 22 As shown, the lead-acid battery includes a battery tank. The battery tank is provided with a plurality of isolation chambers, for example, 6. The isolation chambers are provided with a plurality of battery cells, for example, 4. The battery cells include a positive plate B011, a negative plate B012, and a separator B013 located between the positive plate B011 and the negative plate B012. The battery cells of two adjacent isolation chambers share a common Fig. 20 The grid shown. The one with higher potential among the two adjacent battery cells is defined as the first battery cell F1. For example, the first battery cell F1 is located in the isolation chamber at the top. The one with lower potential is the second battery cell F2. For example, the second battery cell F2 is adjacent to the isolation chamber at the top. The positive electrode D1 of the lead-acid battery extends outward from the side wall of the first isolation chamber. The negative electrode D2 extends outward from the side wall of the lower isolation chamber.

[0114] The first portion of the grid is located in the isolation chamber where the first battery cell F1 is located, and serves as the negative electrode of the first battery cell F1. The second portion is located in the isolation chamber where the second battery cell F2 is located, and serves as the positive electrode of the second battery cell F2. The shared pole tab is located in the isolation wall B014 between the two isolation chambers. A seal is formed between the isolation wall B014 and the shared pole tab 102. Those skilled in the art can use a sealing method commonly used in the art to seal the shared pole tab 102 with the isolation wall B014.

[0115] The first battery cell and the second battery cell are not limited to the two shown in the figure, but may be any two adjacent battery cells.

[0116] In this example, the grid is able to connect two battery cells in series, which makes the structure of the lead-acid battery simpler.

[0117] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A grid for a lead-acid battery, characterized in that: include: A grid-shaped current collector, the grid-shaped current collector comprising a plurality of first ribs extending in a predetermined direction and a tab, the tab being connected to the first ribs; as well as A frame, wherein the frame includes a plurality of support bars and a frame connected together, the first ribs intersect with the support bars, the same ends of the plurality of first ribs are respectively fastened to the bottom edges of the frame, the first ribs are at least partially embedded in the support bars, the plurality of first ribs are located on different planes, the frame is clamped between the plurality of first ribs, the grid-like current collector is connected to the frame to form a grid structure in the middle of the grid, and the density of the frame is less than the density of the grid-like current collector.

2. The grid according to claim 1, characterized in that: A plurality of the first ribs extend at the same end and are connected together to form a collection portion, a terminal end of the collection portion forms the pole lug, and a portion of the collection portion other than the pole lug forms a second rib.

3. The grid according to claim 2, characterized in that: The lengths of the plurality of first ribs are equal, and the collection portion protrudes outward from the frame along the extending direction of the first ribs; or The pole lug protrudes outward from the frame along the extending direction of the first rib, and the second rib is located in the area surrounded by the frame.

4. The grid according to claim 1, characterized in that: A plurality of the first ribs extend out of the frame at the same end, and the portion extending out of the frame forms the pole lug.

5. The grid according to claim 1, characterized in that: The plurality of first ribs are divided into a first part and a second part and a conductive part between the first part and the second part along the extension direction, a first electrode active material is attached to the first part, a second electrode active material is attached to the second part, the conductive part forms the electrode ear, and the first part and the second part share the electrode ear.

6. The grid according to claim 1, characterized in that: There are multiple first ribs and multiple support bars, each of the first ribs is connected to all the support bars, and each of the support bars is connected to all the first ribs.

7. The grid according to claim 1, characterized in that: The frame includes a first frame and a second frame that are arranged opposite to each other, the grid-shaped current collector is located between the first frame and the second frame, and the grid-shaped current collector is embedded in the first frame and the second frame.

8. The grid according to claim 7, characterized in that: The first frame and the second frame are both made of plastic and connected together by ultrasonic welding. Energy conducting ribs are formed at locations of the first frame or the second frame corresponding to gaps between the plurality of first ribs.

9. The grid according to claim 1, characterized in that: The frame is integrally formed, the support bar is provided with a plurality of opening grooves in the extension direction of the support bar, a part of the plurality of opening grooves has an opening direction opposite to that of the other parts, and the plurality of the first ribs are respectively inserted into the plurality of opening grooves.

10. The grid according to claim 1, characterized in that: A groove is provided at a location where the frame is connected to the electrode active material.

11. The grid according to claim 1, characterized in that: A cap protruding from the first ribs or a bottom rib used to connect two adjacent first ribs is provided at one end of the plurality of first ribs opposite to the pole lug, and the cap cap or the bottom rib is embedded in the bottom edge of the frame.

12. The grid according to any one of claims 1 to 11, characterized in that: The frame is made of plastic, rubber, resin, fiber, ceramic or glass.

13. The grid according to any one of claims 1 to 11, characterized in that: The grid-shaped current collector is made of lead or lead alloy, or lead coated with copper wire or aluminum wire.

14. The grid according to any one of claims 1 to 11, characterized in that: The grid-shaped current collector is formed by bending a metal wire, integrally stamping or casting.

15. A lead-acid battery, characterized in that: include: A battery slot, wherein a cavity is formed in the battery slot, and one or more battery cells are arranged in the cavity, wherein the battery cells include a positive plate, a negative plate, and a partition located between the positive plate and the negative plate, the positive plate and the negative plate include the grid as described in any one of claims 1-4 and 6-14, the tabs of the multiple positive plates are electrically connected, and the tabs of the multiple negative plates are electrically connected.

16. The lead-acid battery according to claim 15, characterized in that: It also includes a bus bar, which has multiple groups of first clamping plates and second clamping plates arranged opposite to each other, and the pole lugs are clamped between the first clamping plates and the second clamping plates. The multiple positive plates and the multiple negative plates are electrically connected through their respective bus bars.

17. The lead-acid battery according to claim 16, characterized in that: The cavity forms a plurality of isolated chambers arranged side by side, and a battery cell is arranged in each of the isolated chambers; the plurality of battery cells are connected in series, and two adjacent battery cells are connected in series through the common bus bar.

18. The lead-acid battery according to claim 16, characterized in that: It also includes a battery cover, on which a sealing glue groove is arranged, and the sealing glue groove is filled with sealing glue to seal the bus bar in the battery cover.

19. The lead-acid battery according to claim 16, characterized in that: The busbar is made of copper and copper alloy or aluminum and aluminum alloy.

20. A lead-acid battery, characterized in that: include: A battery slot, wherein a plurality of isolation chambers are arranged in the battery slot, and battery cells are arranged in the isolation chambers, wherein the battery cells include a positive plate, a negative plate and a partition located between the positive plate and the negative plate, and the battery cells in two adjacent isolation chambers share the grid as described in claim 5, and it is defined that the one with a higher potential among the two adjacent battery cells is a first battery cell, and the one with a lower potential is a second battery cell, wherein the first portion of the grid is located in the isolation chamber where the first battery cell is located, and serves as the negative electrode of the first battery cell; the second portion of the grid is located in the isolation chamber where the second battery cell is located, and serves as the positive electrode of the second battery cell, and the shared pole ear is located in the isolation wall between the two isolation chambers.

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