A large-capacity battery structure

Abstract

The present invention provides a large-capacity battery structure, belonging to the technical field of energy storage batteries. It includes a plurality of serially-connected large-capacity battery units. Each large-capacity battery unit comprises a battery cylinder body, a positive electrode cover plate arranged at one opening side of the battery cylinder body, and a negative electrode cover plate arranged at the other opening side of the battery cylinder body. The positive electrode cover plate serves as a positive electrode column, and the negative electrode cover plate serves as a negative electrode column. A positive electrode connection strip is arranged on the side of the positive electrode cover plate away from the inner cavity of the battery cylinder body, and a negative electrode connection strip is arranged on the side of the negative electrode cover plate away from the inner cavity of the battery cylinder body. When a plurality of large-capacity battery units are connected in series, the positive electrode connection strip corresponding to the positive electrode cover plate of two adjacent battery cylinder bodies is electrically connected to the negative electrode connection strip corresponding to the negative electrode cover plate. In the present invention, the positive electrode column and the positive electrode cover plate are integrated into one body, and the negative electrode column and the negative electrode cover plate are integrated into one body, eliminating the positive electrode column and the negative electrode column, saving materials and reducing costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage batteries, relates to the assembly technology of large-capacity batteries, and specifically relates to a large-capacity battery structure. Background Art

[0002] As of the end of 2020, among various electrochemical energy storage technologies, lithium-ion batteries had the largest cumulative installed capacity, approximately 2.9 GW.

[0003] Currently, most existing large-capacity lithium-ion batteries are formed by connecting multiple small-capacity batteries in parallel to form a large-capacity lithium-ion battery. When using a large-capacity lithium-ion battery, in order to meet the capacity requirements, it is necessary to connect them in series to meet the power consumption needs. As a result, the types of connection parts are numerous, the connection steps are complex and cumbersome, time-consuming and laborious, and the usage of battery management systems, wires, and battery boxes is huge, resulting in high energy storage costs.

[0004] For example, the patent with the authorized patent number CN202259564U discloses a lithium-ion battery with high safety, including a housing, a positive electrode post, a negative electrode post, a cover plate hermetically fixed on the housing, and an electrode core placed inside the housing. A safety valve is fixedly installed on the cover plate. The positive electrode post and the negative electrode post are placed at both ends of the battery. The positive electrode and the negative electrode on the electrode core are respectively connected to the positive electrode post and the negative electrode post. A groove is provided on the bottom surface of the housing, and a circuit composed of a bimetallic thermal protector and a polymer positive temperature coefficient thermistor connected in parallel is provided in the groove. One end of the circuit is connected to the positive electrode post of the battery through a wire, and the other end is connected to the external load circuit of the battery or the negative electrode post of an adjacent battery connected in series with the battery. This patent requires setting a positive electrode post and a negative electrode post at both ends of the battery housing, and then passing the positive electrode post and the negative electrode post through the cover plate. This structure has complex connections, large consumption of battery box materials, and high production costs. Summary of the Invention

[0005] Aiming at the problems of the existing large-capacity batteries, such as the large variety of connection parts, complex and cumbersome connection steps, large consumption of battery box materials, and high production costs during series connection, the present invention proposes a large-capacity battery structure.

[0006] The present invention mainly integrates the positive electrode cover plate with the positive electrode post and the negative electrode cover plate with the negative electrode post. When connecting large-capacity batteries in series, the connection between the positive electrode cover plate and the negative electrode cover plate of two adjacent large-capacity batteries is carried out to achieve the series connection of large-capacity batteries, reducing the parts between two adjacent large-capacity batteries during connection, and at the same time eliminating the electrode posts, saving the consumption of battery box materials, and reducing costs. The specific technical solution is as follows:

[0007] A large-capacity battery structure includes a plurality of serially connected large-capacity battery units. Each large-capacity battery unit includes a battery cylinder body, a positive electrode cover plate provided on one side of the battery cylinder body, and a negative electrode cover plate provided on the other side of the battery cylinder body. The positive electrode cover plate is a positive electrode column, and the negative electrode cover plate is a negative electrode column. On the side of the positive electrode cover plate away from the inner cavity of the battery cylinder body, there is a positive electrode connection bar, and on the side of the negative electrode cover plate away from the inner cavity of the battery cylinder body, there is a negative electrode connection bar. When a plurality of large-capacity battery units are connected in series, the positive electrode connection bar corresponding to the positive electrode cover plate of two adjacent battery cylinder bodies is electrically connected to the negative electrode connection bar corresponding to the negative electrode cover plate.

[0008] Further defined, the positive electrode cover plate and the positive electrode connection bar are connected to form a structure with a T-shaped longitudinal cross-section; the negative electrode cover plate and the negative electrode connection bar are connected to form a structure with a T-shaped longitudinal cross-section.

[0009] Further defined, the large-capacity battery structure further includes one or more battery modules. One or more battery modules are placed inside the battery cylinder body. The positive electrode of the battery module is connected to the positive electrode cover plate, and the negative electrode of the battery module is connected to the negative electrode cover plate; if there are multiple battery modules, the multiple battery modules are arranged side by side.

[0010] Further defined, if there are multiple battery modules, two adjacent battery modules are fixedly connected by a connecting piece.

[0011] Further defined, the positive electrode of the battery module is connected to the positive electrode cover plate through a transfer row, and the negative electrode of the battery module is connected to the negative electrode cover plate through a transfer row.

[0012] Further defined, on the side of the battery cylinder body connected to the positive electrode cover plate, there is a flanging. The battery cylinder body is connected to the positive electrode cover plate through the flanging; on the side of the battery cylinder body connected to the negative electrode cover plate, there is a flanging. The battery cylinder body is connected to the negative electrode cover plate through the flanging.

[0013] Further defined, there are reinforcing ribs connected to the battery cylinder body. The two end portions of the reinforcing ribs respectively point to the flanging on the battery cylinder body connected to the positive electrode cover plate and the flanging connected to the negative electrode cover plate.

[0014] Further defined, both between the positive electrode cover plate and the flanging and between the negative electrode cover plate and the flanging are insulated and sealed by insulating gaskets.

[0015] Further defined, there are connection through-holes provided on the flanging of the battery cylinder body, positive electrode cover plate connection holes provided on the edge of the positive electrode cover plate, and negative electrode cover plate connection holes provided on the edge of the negative electrode cover plate. The positive electrode cover plate and the battery cylinder body are fixedly connected by screws passing through the positive electrode cover plate connection holes and the connection through-holes, and the negative electrode cover plate and the battery cylinder body are fixedly connected by screws passing through the negative electrode cover plate connection holes and the connection through-holes.

[0016] It is further defined that an insulating sheath is provided between the positive electrode cover plate connection hole and the bolt, between the negative electrode cover plate connection hole and the bolt, and between the connection through hole and the bolt.

[0017] It is further defined that the battery cylinder is provided with an explosion relief hole, and an explosion relief valve is provided at the explosion relief hole.

[0018] It is further defined that the battery cylinder is a rectangular cylindrical structure.

[0019] It is further defined that the battery cylinder is formed by die casting, and the material of the battery cylinder is cast iron or cast aluminum.

[0020] It is further defined that the battery module includes a strapping tape, a pressure plate and a plurality of battery cells, the plurality of battery cells are stacked in parallel to form a module unit, the pressure plate is arranged on two opposite sides of the module unit, and the pressure plate and the battery cells are arranged in parallel; the pressure plate and the module unit are fixed by binding with the strapping tape.

[0021] It is further defined that the pressing plate and the strapping belt are both made of insulating materials.

[0022] It is further defined that the insulation pad has a withstand temperature of above 130°C.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. A large-capacity battery structure of the present invention comprises a plurality of large-capacity battery cells connected in series, the large-capacity battery cell comprising a battery cylinder and a positive electrode cover plate arranged on one side of the battery cylinder and a negative electrode cover plate arranged on the other side of the battery cylinder, the positive electrode cover plate being a positive electrode column, and the negative electrode cover plate being a negative electrode column; a positive electrode connecting strip is arranged on the positive electrode cover plate, and a negative electrode connecting strip is arranged on the negative electrode cover plate, and when a plurality of large-capacity battery cells are connected in series, the positive electrode connecting strip corresponding to the positive electrode cover plates of two adjacent battery cylinders is electrically connected to the negative electrode connecting strip corresponding to the negative electrode cover plates; the positive electrode column and the positive electrode cover plate of the present invention are integrated into one, and the negative electrode column and the negative electrode cover plate are integrated into one, thereby eliminating the positive electrode column and the negative electrode column, saving materials and reducing costs; at the same time, when a plurality of large-capacity battery cells are connected in series, the positive electrode connecting strip and the negative electrode connecting strip are connected to each other, so that the electrical connection between the positive electrode cover plates and the negative electrode cover plates of the adjacent upper battery cylinders can be easily realized, so that the plurality of large-capacity battery cells are more convenient to operate when connected, and the number of parts during connection is reduced.

[0025] 2. The positive electrode cover plate is connected to the positive electrode connecting bar to form a structure with a T-shaped longitudinal section; the negative electrode cover plate is connected to the negative electrode connecting bar to form a structure with a T-shaped longitudinal section. The T-shaped structure can facilitate the connection between the positive electrode connecting bar and the negative electrode connecting bar, while ensuring a sufficiently large connection contact area, that is, a sufficiently large flow area, to ensure the safety of the battery during operation.

[0026] 3. Multiple battery modules can be arranged in parallel within the same battery cylinder, and the number of battery modules can be specifically set according to the battery capacity requirements.

[0027] 4. Two adjacent battery modules are fixedly connected by a connecting piece; the stability of the battery module can be enhanced by the connecting piece.

[0028] 5. The positive electrode of the battery module is connected to the positive electrode cover plate through a transfer row, and the negative electrode of the battery module is connected to the negative electrode cover plate through a transfer row. The stability of the connection between the positive electrode of the battery module and the positive electrode cover plate and between the negative electrode of the battery module and the negative electrode cover plate can be ensured through the transfer row, and virtual connection can be effectively prevented.

[0029] 6. Flanges are provided on one side of the battery cylinder where it is connected to the positive electrode cover plate and on the other side where it is connected to the negative electrode cover plate. The connection between the battery cylinder and the positive electrode cover plate and the negative electrode cover plate can be facilitated through the flanges.

[0030] 7. Reinforcing ribs are connected to the battery cylinder, and the two ends of the reinforcing ribs respectively point to the flange where the battery cylinder is connected to the positive electrode cover plate and the flange where it is connected to the negative electrode cover plate. The strength of the battery cylinder is enhanced through the reinforcing ribs.

[0031] 8. The positive electrode cover plate and the flange as well as the negative electrode cover plate and the flange are both connected in an insulating and sealing manner through an insulating pad. The positive electrode cover plate, the negative electrode cover plate, and the battery cylinder are insulated from each other through the insulating pad.

[0032] 9. Insulating sheaths are provided between the connection holes of the positive electrode cover plate and the bolts, between the connection holes of the negative electrode cover plate and the bolts, and between the connection through holes and the bolts. The positive electrode cover plate, the negative electrode cover plate, the battery cylinder, and the bolts are insulated from each other through the insulating sheaths.

[0033] 10. The battery module includes a bundling strap, a pressing plate, and multiple battery cells. The multiple battery cells are arranged in parallel and stacked to form a module unit. The pressing plates are arranged on the opposite two side parts of the module unit, and the pressing plates and the module unit are fixed by being tied with the bundling strap; the multiple battery cells are fixed by the pressing plates and the bundling strap. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of a large-capacity battery structure of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the battery cylinder of the present invention;

[0036] Figure 3 It is a schematic structural diagram of the battery module of the present invention;

[0037] Figure 4 It is a schematic structural diagram after large-capacity battery units are connected in series;

[0038] Figure 5 is a structural schematic diagram of the positive electrode cover plate;

[0039] Figure 6 is a structural schematic diagram of the negative electrode cover plate;

[0040] Figure 7 is a connection schematic diagram between the positive electrode cover plate, the negative electrode cover plate and the battery module Figure 1 ;

[0041] Figure 8 is a connection schematic diagram between the positive electrode cover plate, the negative electrode cover plate and the battery module Figure 2 ;

[0042] Figure 9 is a schematic cross-sectional view of the connection after the large-capacity battery cells are connected in series;

[0043] Among them, 1 - battery cylinder, 11 - flanging, 12 - explosion vent, 13 - reinforcing rib, 2 - positive electrode cover plate, 21 - positive electrode connection strip, 22 - positive electrode cover plate connection hole, 3 - negative electrode cover plate, 31 - negative electrode connection strip, 32 - negative electrode cover plate connection hole, 4 - battery module, 41 - battery cell, 42 - pressure plate, 43 - binding band, 44 - connection piece, 45 - adapter row, 5 - insulating pad, 6 - insulating sheath, 7 - explosion vent valve. Specific embodiments

[0044] The technical solutions of the present invention will be further explained below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the following described embodiments.

[0045] A large-capacity battery structure of the present invention includes a plurality of serially connected large-capacity battery units. Each large-capacity battery unit includes a battery cylinder 1, a positive electrode cover plate 2 disposed on one side of the battery cylinder 1, and a negative electrode cover plate 3 disposed on the other side of the battery cylinder 1. The positive electrode cover plate 2 serves as a positive electrode column, and the negative electrode cover plate 3 serves as a negative electrode column. On the side of the positive electrode cover plate 2 away from the inner cavity of the battery cylinder 1, there is a positive electrode connection strip 21. On the side of the negative electrode cover plate 3 away from the inner cavity of the battery cylinder 1, there is a negative electrode connection strip 31. When a plurality of large-capacity battery units are connected in series, the positive electrode connection strip 21 corresponding to the positive electrode cover plate 2 of two adjacent battery cylinders 1 is electrically connected to the negative electrode connection strip 31 corresponding to the negative electrode cover plate 3. The positive electrode cover plate 2 and the positive electrode connection strip 21 are connected to form a structure with a T-shaped longitudinal cross-section; the negative electrode cover plate 3 and the negative electrode connection strip 31 are connected to form a structure with a T-shaped longitudinal cross-section. The large-capacity battery structure further includes one or more battery modules 4. One or more battery modules 4 are placed inside the battery cylinder 1. The positive electrode of the battery module 4 is connected to the positive electrode cover plate 2, and the negative electrode of the battery module 4 is connected to the negative electrode cover plate 3. If there are multiple battery modules 4, they are arranged in parallel. If there are multiple battery modules 4, two adjacent battery modules 4 are fixedly connected by a connecting piece 44. The positive electrode of the battery module 4 is connected to the positive electrode cover plate 2 through a transfer row 45, and the negative electrode of the battery module 4 is connected to the negative electrode cover plate 3 through a transfer row 45. On the side of the battery cylinder 1 connected to the positive electrode cover plate 2, there is a flanging 11. The battery cylinder 1 is connected to the positive electrode cover plate 2 through the flanging 11. On the side of the battery cylinder 1 connected to the negative electrode cover plate 3, there is a flanging 11. The battery cylinder 1 is connected to the negative electrode cover plate 3 through the flanging 11. Reinforcing ribs 13 are connected to the battery cylinder 1, and the two end portions of the reinforcing ribs 13 respectively point to the flanging 11 on the battery cylinder 1 connected to the positive electrode cover plate 2 and the flanging 11 connected to the negative electrode cover plate 3. Both between the positive electrode cover plate 2 and the flanging 11 and between the negative electrode cover plate 3 and the flanging 11 are connected in an insulating and sealing manner through an insulating pad 5. Connection through holes are provided on the flanging 11 of the battery cylinder 1. Positive electrode cover plate connection holes 22 are provided at the edge of the positive electrode cover plate 2, and negative electrode cover plate connection holes 32 are provided at the edge of the negative electrode cover plate 3. The positive electrode cover plate 2 and the battery cylinder 1 are fixedly connected by screws passing through the positive electrode cover plate connection holes 22 and the connection through holes. The negative electrode cover plate 3 and the battery cylinder 1 are fixedly connected by screws passing through the negative electrode cover plate connection holes 32 and the connection through holes. Insulating sheaths 6 are provided between the positive electrode cover plate connection holes 22 and the bolts, between the negative electrode cover plate connection holes 32 and the bolts, and between the connection through holes and the bolts. A venting port 12 is provided on the battery cylinder 1, and a venting valve 7 is provided at the venting port 12. The battery cylinder 1 is of a rectangular cylindrical structure. The battery cylinder 1 is formed by casting and pressing, and the material of the battery cylinder 1 is cast iron or cast aluminum. The battery module 4 includes a bundling strap 43, a pressing plate 42, and a plurality of battery cells 41. The plurality of battery cells 41 are arranged in parallel and stacked to form a module unit. The pressing plate 42 is disposed on the opposite two side portions of the module unit, and the pressing plate 42 is arranged in parallel with the battery cells 41. The pressing plate 42 and the module unit are fixedly bound by the bundling strap 43.The internal resistances and voltages of multiple battery cells 41 in the same module unit are the same, which can improve the consistency of the operation of the battery cells 41 within the same module unit. Both the pressure plate 42 and the binding strap 43 are made of insulating materials. The insulation pad 5 can withstand temperatures above 130 °C. The insulating sheath 6 is made of one or a combination of two or more of polyvinyl chloride, polypropylene, polystyrene, polyoxymethylene, polymethyl methacrylate, polybutylene terephthalate, polycarbonate, or acrylonitrile-butadiene-styrene copolymer.

[0046] Embodiment 1

[0047] Refer to Figure 1 , a large-capacity battery structure in this embodiment includes multiple series-connected large-capacity battery units. Each large-capacity battery unit includes a battery cylinder 1. A positive electrode cover plate 2 is provided at one opening side of the battery cylinder 1, and a negative electrode cover plate 3 is provided at the other opening side of the battery cylinder 1. The positive electrode cover plate 2 serves as the positive electrode column of the large-capacity battery unit, and the negative electrode cover plate 3 serves as the negative electrode column of the large-capacity battery unit; refer to Figure 5 , on the side of the positive electrode cover plate 2 away from the inner cavity of the battery cylinder 1, a positive electrode connection bar 21 is provided, refer to Figure 6 , on the side of the negative electrode cover plate 3 away from the inner cavity of the battery cylinder 1, a negative electrode connection bar 31 is provided. When multiple large-capacity units are connected in series, the corresponding positive electrode connection bar 21 of the positive electrode cover plate 2 and the corresponding negative electrode connection bar 31 of the negative electrode cover plate 3 of two adjacent battery cylinders 1 are electrically connected.

[0048] Preferably, the positive electrode cover plate 2 and the negative electrode cover plate 3 of this embodiment are provided on two opposite side surfaces of the battery cylinder 1.

[0049] It should be noted that the number of multiple series-connected large-capacity battery units in this embodiment can be 2, 3, 4, 5, 6, or even more. The specific number is set according to the capacity requirements of the large-capacity battery.

[0050] Embodiment 2

[0051] A large-capacity battery structure in this embodiment, based on Embodiment 1, the positive electrode cover plate 2 and the positive electrode connection bar 21 are connected to form a structure with a T-shaped longitudinal section; the negative electrode cover plate 3 and the negative electrode connection bar 31 are connected to form a structure with a T-shaped longitudinal section. When multiple large-capacity units are connected in series, the electrical connection between the positive electrode cover plate 2 and the negative electrode cover plate 3 is achieved by overlapping the positive electrode connection bar 21 and the negative electrode connection bar 31, which facilitates the connection and also increases the current-carrying area between the positive electrode cover plate 2 and the negative electrode cover plate 3.

[0052] Refer to Figure 9 , preferably, the positive electrode connection bar 21 and the negative electrode connection bar 31 in this embodiment are fixed by screws.

[0053] Refer toFigure 2 , in this embodiment, a plurality of reinforcing ribs 13 are arranged in parallel on the outer side wall of the battery cylinder body 1, and both ends of the reinforcing ribs 13 respectively point to the flanges 11 where the battery cylinder body 1 is connected to the positive electrode cover plate 2 and the flanges 11 where the battery cylinder body 1 is connected to the negative electrode cover plate 3; the edge at the connection between the battery cylinder body 1 and the positive electrode cover plate 2 extends outward to form a flange 11, and the battery cylinder body 1 is connected to the positive electrode cover plate 2 through the flange 11 on this side; the edge at the connection between the battery cylinder body 1 and the negative electrode cover plate 3 extends outward to form a flange 11, and the battery cylinder body 1 is connected to the negative electrode cover plate 3 through the flange 11 on this side.

[0054] Preferably, in this embodiment, insulating gaskets 5 are provided at the connection between the positive electrode cover plate 2 and the flange 11 and at the connection between the negative electrode cover plate 3 and the flange 11, and the insulating gaskets 5 are used to achieve insulating sealing between the battery cylinder body 1 and the positive electrode cover plate 2 and the negative electrode cover plate 3.

[0055] Preferably, the temperature tolerance of the insulating gasket 5 in this embodiment is above 130 °C, and specifically, the material of the insulating gasket 5 is rubber, polypropylene or epoxy resin.

[0056] See Figure 8 , in this embodiment, connection through-holes are provided on the flange of the battery cylinder body 1, positive electrode cover plate connection holes 22 are provided on the edge of the positive electrode cover plate 2, and negative electrode cover plate connection holes 32 are provided on the edge of the negative electrode cover plate 3. The positive electrode cover plate 2 and the battery cylinder body 1 are fixedly connected by screws passing through the positive electrode cover plate connection holes 22, and the negative electrode cover plate 3 and the battery cylinder body 1 are fixedly connected by screws passing through the negative electrode cover plate connection holes 32 and the connection through-holes.

[0057] Preferably, the bolts in this embodiment penetrate through the positive electrode cover plate connection holes 22 and the connection through-holes, or penetrate through the negative electrode cover plate connection holes 32 and the connection through-holes.

[0058] In this embodiment, insulating sheaths 6 are provided between the positive electrode cover plate connection holes 22 and the bolts, between the negative electrode cover plate connection holes 32 and the bolts, and between the connection through-holes and the bolts; the insulating sheaths 6 are used to insulate and seal the bolts between the positive electrode cover plate 2 and the negative electrode cover plate 3.

[0059] Preferably, the material of the insulating sheath 6 in this embodiment is one or a combination of two or more of polyvinyl chloride, polypropylene, polystyrene, polyoxymethylene, polymethyl methacrylate, polybutylene terephthalate, polycarbonate or acrylonitrile-butadiene-styrene copolymer.

[0060] It should be noted that the number of the reinforcing ribs 13 in this embodiment can be 3, 4, 5, 6, 7, 8, or even more, and the plurality of reinforcing ribs 13 are evenly distributed along the circumferential direction of the battery cylinder body 1.

[0061] In this embodiment, a pressure relief port 12 is provided on the positive electrode cover plate 2 or the negative electrode cover plate 3, and a pressure relief valve is provided at the pressure relief port 12. The pressure relief valve is a three-way valve or a four-way valve; if it is a three-way valve, one interface communicates with the inner cavity of the battery cylinder 1, one interface is for liquid injection, and the other interface is for pressure relief; if it is a four-way valve, one interface communicates with the inner cavity of the battery cylinder 1, one interface is for liquid injection, one interface is for pressure relief, and one interface is for electrolyte filling.

[0062] Preferably, the battery cylinder 1 of this embodiment is a rectangular cylindrical structure; however, it is not limited to a rectangular cylindrical structure, and it can also be a circular cylindrical structure, a triangular prism-shaped cylindrical structure, etc.

[0063] Embodiment 3

[0064] See Figure 3 , in a large-capacity battery structure of this embodiment, on the basis of Embodiment 2, this embodiment further includes one or more battery modules 4. One or more battery modules 4 are placed inside the battery cylinder 1. The positive electrode of the battery module 4 is electrically connected to the positive electrode cover plate 2, and the negative electrode of the battery module 4 is electrically connected to the negative electrode cover plate 3; if there are multiple battery modules 4, the multiple battery modules 4 are arranged in parallel along the length direction of the battery cylinder 1. See Figure 4 , if there are multiple battery modules 4, two adjacent battery modules 4 are fixedly connected by a connecting piece 44.

[0065] It should be noted that the number of the multiple battery modules 4 in this embodiment can be 2, 3, 4, 5, or even more, and is specifically set according to the capacitance requirements of a single large-capacity battery unit.

[0066] See Figure 7 , the positive electrode of the battery module 4 in this embodiment is electrically connected to the positive electrode cover plate 2 through an adapter row 45, and the negative electrode of the battery module 4 is electrically connected to the negative electrode cover plate 3 through the adapter row 45.

[0067] Preferably, the adapter row 45 of this embodiment is an L-shaped structure, and the L-shaped structure is convenient for connection; the material of the adapter row 45 is metal, and specifically preferably it can be aluminum alloy or pure copper.

[0068] The battery cylinder 1 of this embodiment is formed by casting and pressing, and the battery cylinder 1 is made of metal.

[0069] Preferably, the material of the battery cylinder 1 of this embodiment is cast iron or cast aluminum.

[0070] Embodiment 4

[0071] In this embodiment, a large-capacity battery structure is provided. On the basis of Embodiment 3, the battery module 4 includes a bundling strap 43, a pressing plate 42, and a plurality of battery cells 41. The plurality of battery cells 41 are arranged in parallel and stacked to form a module unit. The pressing plate 42 is disposed on opposite side portions of the module unit, and the pressing plate 42 is arranged in parallel with the battery cells 41. The pressing plate 42 and the module unit are fixed by bundling with the bundling strap 43.

[0072] Preferably, in this embodiment, bundling straps 43 are correspondingly arranged at both the upper end portion and the lower end portion of the module unit.

[0073] It should be noted that the specific number of battery cells 41 included in the same module unit in this embodiment can be 2, 3, 4, 5, 8, 10, or even more. The specific number is set according to the capacity requirements of the same module unit.

[0074] The internal resistances and voltages of the plurality of battery cells 41 in the same module unit in this embodiment are the same, which can improve the working consistency of the battery cells 41 in the same module unit.

[0075] Both the pressing plate 42 and the bundling strap 43 in this embodiment are made of insulating materials. Specifically, the material of the pressing plate 42 can be one or a combination of two or more of polyvinyl chloride, polypropylene, polystyrene, polyoxymethylene, polymethyl methacrylate, polybutylene terephthalate, polycarbonate, or acrylonitrile-butadiene-styrene copolymer.

[0076] The assembling method of the large-capacity battery structure in this embodiment is as follows: A plurality of battery cells 41 are arranged in parallel and stacked to form a module unit. Pressing plates 42 are arranged on opposite sides of the module unit. The stacked plurality of battery cells 41 are pressed by the pressing plates 42. Then, the module unit and the pressing plates 42 are fixed by bundling with the bundling strap 43 to form the battery module 4. If a plurality of battery modules 4 need to be placed in the battery cylinder 1, adjacent two battery modules 4 are fixedly connected through a connecting piece 44. After connection, the plurality of battery modules 4 are placed in the battery cylinder 1 together. Then, the positive electrodes of the plurality of battery modules 4 are electrically connected to the positive electrode cover plate 2 through a transfer row 45, and the negative electrodes of the plurality of battery modules 4 are electrically connected to the negative electrode cover plate 3 through a transfer row 45 to form a large-capacity battery unit. If series connection is required between a plurality of large-capacity battery units, electrical connection is achieved through the positive connection strip 21 corresponding to the positive electrode cover plate 2 and the negative connection strip 31 corresponding to the negative electrode cover plate 3 of adjacent two battery cylinders 1, so as to realize the series connection between the large-capacity battery units.

[0077] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and is not intended to limit the present invention. For those skilled in the art, without departing from the concept of the present invention, several simple deductions or substitutions can still be made. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be regarded as belonging to the patent protection scope determined by the claims submitted for the present invention.

Claims

1. A large-capacity battery structure, characterized in that, It includes multiple large-capacity battery cells connected in series. The large-capacity battery cell includes a battery cylinder body, a positive electrode cover plate arranged on one side of the battery cylinder body, and a negative electrode cover plate arranged on the other side of the battery cylinder body. The positive electrode cover plate is a positive electrode column, and the negative electrode cover plate is a negative electrode column. On the side of the positive electrode cover plate away from the inner cavity of the battery cylinder body, there is a positive electrode connection bar, and on the side of the negative electrode cover plate away from the inner cavity of the battery cylinder body, there is a negative electrode connection bar. When multiple large-capacity battery cells are connected in series, the positive electrode connection bar corresponding to the positive electrode cover plate of two adjacent battery cylinder bodies is electrically connected to the negative electrode connection bar corresponding to the negative electrode cover plate. The large-capacity battery structure further includes one or more battery modules. One or more battery modules are placed inside the battery cylinder body. The positive electrode of the battery module is connected to the positive electrode cover plate, and the negative electrode of the battery module is connected to the negative electrode cover plate. If there are multiple battery modules, the multiple battery modules are arranged side by side. The battery module includes a binding strap, a pressing plate, and multiple battery cells. The multiple battery cells are stacked side by side to form a module unit. The pressing plate is arranged on the opposite two side parts of the module unit, and the pressing plate is arranged side by side with the battery cells. The pressing plate and the module unit are fixed by the binding strap. The battery cylinder body is formed by casting and pressing, and the material of the battery cylinder body is cast iron or cast aluminum. There is a venting port on the battery cylinder body, and a venting valve is arranged at the venting port.

2. The structure of a large-capacity battery according to claim 1, wherein, The positive electrode cover plate and the positive electrode connection bar are connected to form a structure with a T-shaped longitudinal section; the negative electrode cover plate and the negative electrode connection bar are connected to form a structure with a T-shaped longitudinal section.

3. A large-capacity battery structure according to claim 2, characterized in that, If there are multiple battery modules, two adjacent battery modules are fixedly connected by a connecting piece.

4. The large-capacity battery structure according to claim 3, wherein The positive electrode of the battery module is connected to the positive electrode cover plate through a transfer row, and the negative electrode of the battery module is connected to the negative electrode cover plate through a transfer row.

5. A large-capacity battery structure according to claim 4, characterized in that, On the side of the battery cylinder body connected to the positive electrode cover plate, there is a flanging. The battery cylinder body is connected to the positive electrode cover plate through the flanging; on the side of the battery cylinder body connected to the negative electrode cover plate, there is a flanging. The battery cylinder body is connected to the negative electrode cover plate through the flanging.

6. The structure of a high-capacity battery according to claim 5, characterized in that, Reinforcing ribs are connected to the battery cylinder body, and the two end parts of the reinforcing ribs respectively point to the flanging on the battery cylinder body connected to the positive electrode cover plate and the flanging connected to the negative electrode cover plate.

7. The structure of a high-capacity battery according to claim 6, characterized in that, Both between the positive electrode cover plate and the flanging and between the negative electrode cover plate and the flanging are insulated and sealed by insulating gaskets.

8. A large-capacity battery structure according to claim 7, characterized in that, There are connecting through holes on the flanging of the battery cylinder body, positive electrode cover plate connection holes on the edge of the positive electrode cover plate, and negative electrode cover plate connection holes on the edge of the negative electrode cover plate. The positive electrode cover plate and the battery cylinder body are fixedly connected by screws passing through the positive electrode cover plate connection holes and the connecting through holes, and the negative electrode cover plate and the battery cylinder body are fixedly connected by bolts passing through the negative electrode cover plate connection holes and the connecting through holes.

9. A large-capacity battery structure according to claim 8, characterized in that, Insulating sheaths are arranged between the positive electrode cover plate connection holes and the bolts, between the negative electrode cover plate connection holes and the bolts, and between the connecting through holes and the bolts.

10. A large-capacity battery structure according to claim 9, characterized in that, There is a venting port on the battery cylinder body, and a venting valve is arranged at the venting port.

11. A large-capacity battery structure according to claim 10, characterized in that, The battery cylinder body is a rectangular cylindrical structure.

12. A large-capacity battery structure according to claim 11, characterized in that, The battery cylinder body is formed by casting and pressing, and the material of the battery cylinder body is cast iron or cast aluminum.

13. A large-capacity battery structure according to claim 12, characterized in that, Both the pressing plate and the binding strap are made of insulating materials.

14. A large-capacity battery structure according to claim 13, characterized in that, The insulation pad has a withstand temperature above 130°C.

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