Core rod structure and energy storage device

Abstract

The invention provides a core rod structure and an energy storage device, a core rod body is embedded in a roll core, two ends of the roll core are respectively provided with a positive current collector and a negative current collector, the periphery of the roll core is sleeved with a shell, one end of the shell is provided with a cover plate assembly, the cover plate assembly is respectively provided with a positive pole and a negative pole, the positive pole is connected to the positive current collector, and the negative pole is connected to the negative current collector. The cathode column is connected to the cathode current collector, the core rod body is provided with a cooling channel, and the outlet end and the inlet end of the cooling channel are both located at one end of the core rod body. According to the core rod structure and the energy storage device, the cooling channel is formed in the core rod body, a cooling medium can penetrate into the cooling channel so that temperature control can be conducted on the core rod body and the externally-arranged winding core, the cooling channel is of a U-shaped structure, the outlet end and the inlet end of the cooling channel are located on the same side, installation is convenient, and cost is low. And the cooling medium can be conveniently subjected to circulating operation, the heat exchange path of the cooling medium is increased, and sufficient heat exchange can be conducted on the core rod body.

Description

Technical Field

[0001] The invention belongs to the field of new energy of energy storage devices, and in particular relates to a core rod structure and an energy storage device. Background Art

[0002] Energy storage devices generally refer to media or devices that can store energy and release it when needed. Energy storage devices use different technologies and principles to store energy in different forms so that it can be released when needed. These devices can be physical or chemical, such as supercapacitors, lithium-ion batteries, lithium titanate batteries, etc.

[0003] With the continuous development of the new energy industry, its application areas are constantly expanding. As a result, higher requirements are placed on the cost, volume, safety and other indicators of energy storage devices themselves. How to effectively manage the thermal performance of products, reduce production costs, and reduce the volume occupied by inactive substances have become research focuses. Therefore, the essential innovation of energy storage devices has become inevitable.

[0004] In the prior art, energy storage devices with positive and negative poles led out on the same side are a major mainstream in the current battery industry. In terms of external structure, the overall shape is rectangular, with positive and negative poles and pressure relief valves located at the top, and the outer shell is generally stamped. In terms of internal structure, the pole ears of the winding core are on the same side, that is, the positive and negative pole ears are both located at the top, and the winding core is a flat structure with no filler in the middle and is directly compacted. The interior of the energy storage device is generally composed of one or more winding cores connected in parallel.

[0005] The disadvantages of this structure in the prior art are: 1) The energy storage device has poor heat dissipation capacity, and the internal temperature of the energy storage device and the external temperature often have a temperature difference of 10-20 degrees, which is not conducive to the high-rate use and cycle life of the energy storage device; 2) The pole ears are on the same side, resulting in a small flow area and limited power performance of the energy storage device; 3) During the assembly process, the core and the shell have a certain assembly ratio (mostly the core size is a percentage of the internal size of the shell), and the core is in an unfixed state inside, which can easily cause the core to shake, and in severe cases, it will cause the connection part to tear.

[0006] Another mainstream structure of the existing technology is a cylindrical energy storage device. In terms of external structure, the whole is cylindrical, and the positive and negative electrodes are located on both sides of the energy storage device. The outer shell is generally stamped or extruded. In terms of internal structure, the pole ears of the winding core are led out on the opposite sides, that is, the positive and negative pole ears are located at both ends of the winding core. The winding core is a cylindrical structure, and the middle is mostly a hollow structure. Some products have supports in the middle. The interior of the energy storage device is composed of a winding core.

[0007] The disadvantages of this structure in the prior art are: 1) The cylindrical shape of the energy storage device has a low series-parallel grouping rate; 2) The energy storage device has poor heat dissipation capacity, and the internal temperature of the energy storage device and the external temperature often have a temperature difference of 10-20 degrees, which is not conducive to the use of the energy storage device at a high rate and the cycle life; 3) A few winding cores have a support structure, which mainly supports the winding core and is not connected to the end plate or the shell. The winding core is fixed closely to the busbars on both sides, which is very easy to cause welding damage in a high-intensity environment. Summary of the invention

[0008] In view of this, the present invention aims to propose a core rod structure to solve the problem of poor heat dissipation capability of energy storage devices in the prior art.

[0009] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0010] A core rod structure comprises a core rod body. A cooling channel is arranged on the core rod body, and the cooling channel is in a U-shaped structure. An outlet end and an inlet end of the cooling channel are both located at one end of the core rod body.

[0011] Compared with the prior art, a core rod structure described in the present invention has the following beneficial effects: a cooling channel is provided on the core rod body, and the cooling medium can pass through the cooling channel so as to control the temperature of the core rod body and the winding core arranged outside, and the cooling channel is a U-shaped structure, and the outlet and inlet ends of the cooling channel are located on the same side, which is convenient for installation and circulation of the cooling medium, thereby improving the heat exchange path of the cooling medium and enabling sufficient heat exchange of the core rod body.

[0012] Another object of the present invention is to provide an energy storage device to solve the problem of the prior art energy storage device having positive and negative poles led out from both sides, thus wasting installation space.

[0013] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0014] An energy storage device comprises a winding core, a negative electrode current collector, a positive electrode current collector, a shell and a cover plate assembly, wherein a core rod body is embedded in the winding core, a positive electrode current collector and a negative electrode current collector are respectively arranged at two ends of the winding core, a shell is sleeved on the outer periphery of the winding core, a cover plate assembly is arranged at one end of the shell, and a positive electrode column and a negative electrode column are respectively arranged on the cover plate assembly, the positive electrode column is connected to the positive electrode current collector, and the negative electrode column is connected to the negative electrode current collector.

[0015] Furthermore, the shell is a barrel-shaped structure with one end open, the cover assembly is installed to the open end of the shell, and a positioning hole is provided at the other end of the shell. One end of the core rod body is connected to the positioning hole through a positioning block, and the other end of the core rod body is peripherally sleeved on the inner ring of the cover assembly.

[0016] Furthermore, an insulating sealing plug is inserted into one end of the core rod body, and the insulating sealing plug is connected to the positioning block.

[0017] Furthermore, the cover plate assembly includes a cover plate substrate, a through hole is provided in the middle of the cover plate substrate, the outer periphery of the core rod body is riveted into the through hole through the core rod connector and the core rod insulating ring in sequence, and the riveted core rod connector can deform the core rod insulating ring, and the deformed core rod insulating ring is used for sealing and insulation between the core rod connector and the cover plate substrate.

[0018] Furthermore, a plastic insulating plate is arranged between the cover substrate and the negative electrode collector or the positive electrode collector, and a pole through hole is provided on the cover substrate. One end of the first pole is connected to the negative electrode collector or the positive electrode collector, and the other end of the first pole passes through the plastic insulating plate and the pole through hole in sequence and is located above the cover substrate, and the first pole is a negative pole or a positive pole.

[0019] Furthermore, a pole sealing ring and a plastic insulating block are respectively arranged on the periphery of the first pole, the pole sealing ring is sleeved in the pole through hole, and the plastic insulating block is installed to the upper end of the cover plate substrate through the pole pressing plate.

[0020] Furthermore, the outer edge of the cover substrate is fixedly connected to the inner edge of the open end of the shell, and a second pole is installed on the cover substrate, and the second pole is a positive pole or a negative pole.

[0021] Furthermore, the cover plate substrate is provided with a liquid injection hole, and a sealing nail can be detachably installed in the liquid injection hole.

[0022] Furthermore, an explosion-proof plate is arranged on the cover plate substrate, and a film is arranged on the explosion-proof plate.

[0023] Compared with the prior art, the energy storage device described in the present invention has the following advantages:

[0024] (1) The energy storage device of the present invention has a cooling channel in the core rod body, and a cooling medium runs through the cooling channel to control the temperature of the core rod body and the winding core, and the positive pole and the negative pole are located on the same side of the shell, which effectively reduces the volume occupied by the energy storage device. The grouping rate of the energy storage device is improved.

[0025] (2) In the energy storage device described in the present invention, a positive electrode current collector and a negative electrode current collector are respectively arranged at both ends of the winding core, so as to realize a full-electrode ear structure with different ends of the winding core, thereby increasing the current flow capacity of the energy storage device and effectively improving the adaptability of the energy storage device in a high-rate use environment. In addition, the racetrack-type structure of the energy storage device effectively improves the grouping rate.

[0026] (3) In the energy storage device described in the present invention, the core rod body and the insulating sealing plug are a composite structure, which increases the structural support of the winding core. In addition, the core rod body is directly connected to the cover plate substrate, which effectively improves the movement and shaking of the winding core in the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of the structure of an energy storage device according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of an explosion structure of an energy storage device according to an embodiment of the present invention;

[0030] Figure 3 A cross-sectional schematic diagram of an energy storage device according to an embodiment of the present invention;

[0031] Figure 4 A top view schematically showing a cover plate assembly according to an embodiment of the present invention;

[0032] Figure 5 It is a schematic diagram of the exploded structure of the cover plate assembly according to an embodiment of the present invention;

[0033] Figure 6 It is a cross-sectional schematic diagram of the cover plate assembly described in an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1-winding core; 2-core rod body; 21-cooling channel; 22-exit end; 23-inlet end; 24-insulating sealing plug; 3-negative current collector; 4-positive current collector; 5-shell; 6-cover assembly; 61-positive pole; 62-negative pole; 63-cover substrate; 64-core rod connector; 65-core rod insulating ring; 66-plastic insulating plate; 67-pole sealing ring; 68-plastic insulating block; 69-pole pressure plate; 610-sealing nail; 611-explosion-proof plate; 612-film; 7-positioning block; 8-negative adapter. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] like Figure 1-Figure 6 As shown, an energy storage device includes a winding core 1, a negative electrode current collector 3, a positive electrode current collector 4, a shell 5 and a cover plate assembly 6. A core rod body 2 is embedded in the winding core 1, and a cooling channel 21 is provided on the core rod body 2. The positive electrode current collector 4 and the negative electrode current collector 3 are respectively arranged at both ends of the winding core 1. The shell 5 is sleeved on the outer periphery of the winding core 1, and a cover plate assembly 6 is arranged at one end of the shell 5, and a positive electrode column 61 and a negative electrode column 62 are respectively arranged on the cover plate assembly 6. The positive electrode column 61 is connected to the positive electrode current collector 4, and the negative electrode column 62 is connected to the negative electrode current collector 3. The shell 5 of this embodiment is square in shape with a certain curvature. R angle, its dimension information is 100mm≤length≤1000mm, 50mm≤H height≤300mm, 10mm≤T thickness≤200mm, 2mm≤R (radian)≤100mm, the energy storage device is provided with a cooling channel 21 through the core rod body 2, the cooling channel 21 runs through the cooling medium, and the cooling medium can be any one of a gas medium or a liquid medium. The present embodiment adopts a liquid cooling method to control the temperature of the core rod body 2 and the winding core 1, and the positive pole 61 and the negative pole 62 are located on the same side of the shell 5, which effectively reduces the volume occupied by the energy storage device. The grouping rate of the energy storage device is improved.

[0041] A positive electrode current collector 4 and a negative electrode current collector 3 are respectively arranged at both ends of the winding core 1, so as to realize a full-ear structure with different ends of the winding core 1, thereby increasing the current flow capacity of the energy storage device, effectively improving the adaptability of the energy storage device in a high-rate use environment, and the runway structure of the energy storage device effectively improves the grouping rate.

[0042] like Figure 3 As shown, the cooling channel 21 is in a U-shaped structure, and the outlet end 22 and the inlet end 23 of the cooling channel 21 are located on the same side, so as to facilitate the installation of the core rod body 2 and the circulation of the cooling medium, thereby improving the heat exchange path of the cooling medium and enabling sufficient heat exchange of the core rod body 2.

[0043] The shell 5 is a barrel-shaped structure with one end open, and the cover assembly 6 is installed to the open end of the shell 5. A positioning hole is provided at the other end of the shell 5. One end of the core rod body 2 is connected to the positioning hole through a positioning block 7, and the other end of the core rod body 2 is sleeved on the inner ring of the cover assembly 6. One end of the core rod body 2 is inserted into the insulating sealing plug 24, and the insulating sealing plug 24 is connected to the positioning block 7; the cover assembly 6 includes a cover substrate 63, and an insertion hole is provided in the middle of the cover substrate 63. The periphery of the core rod body 2 is riveted into the insertion hole through the core rod connector 64 and the core rod insulating ring 65 in turn, and the riveted core rod connector 64 can deform the core rod insulating ring 65. The deformed core rod insulating ring 65 is used for sealing and insulation between the core rod connector 64 and the cover substrate 63. The core rod body 2 and the insulating sealing plug 24 are a composite structure, which increases the structural support of the winding core 1. In addition, the core rod body 2 is directly connected to the cover substrate 63, which effectively improves the movement and shaking of the winding core 1 in the energy storage device.

[0044] A plastic insulating plate 66 is arranged between the cover substrate 63 and the negative electrode collector 3 or the positive electrode collector 4. A pole through hole is arranged on the cover substrate 63. One end of the first pole is connected to the negative electrode collector 3 or the positive electrode collector 4. The other end of the first pole passes through the plastic insulating plate 66 and the pole through hole in sequence and is located above the cover substrate 63. The first pole is the negative pole 62 or the positive pole 61. The first pole in this embodiment is the negative pole 62, which is connected to the negative electrode collector 3 through the negative electrode adapter 8. At the same time, a pole sealing ring 67 and a plastic insulating block 68 are respectively arranged on the periphery of the first pole. The pole sealing ring 67 is sleeved in the pole through hole, and the plastic insulating block 68 is installed to the upper end of the cover substrate 63 through the pole pressing plate 69 to ensure insulation between the periphery of the first pole and the cover substrate 63 and the shell 5.

[0045] The outer edge of the cover substrate 63 is fixedly connected to the inner edge of the open end of the shell 5, and a second pole is installed on the cover substrate 63. The second pole is the positive pole 61 or the negative pole 62. The second pole in this embodiment is the positive pole 61. Combined with the connection relationship of the above-mentioned negative pole 62, the positive pole 61 and the negative pole 62 are on the same side. During implementation, a liquid injection hole is provided on the cover substrate 63, and a sealing nail 610 can be detachably installed in the liquid injection hole. An explosion-proof plate 611 is provided on the cover substrate 63, and a film 612 is provided on the explosion-proof plate 611 to facilitate the injection of liquid into the shell 5 and improve the installation performance.

[0046] Compared with the above embodiment, another embodiment of an energy storage device has a winding core 1 including a positive electrode sheet, a negative electrode sheet and a separator, and is wound on a core rod body 2 in a laminated structure of separator-negative electrode sheet-separator-positive electrode sheet, wherein the tabs of the positive electrode sheet and the negative electrode sheet are on opposite sides during the winding process; the positive electrode sheet comprises a positive electrode active material coating and four layers of a positive electrode current collector; the four layers of the positive electrode current collector are aluminum foil, and all the tabs of the aluminum foil are retained; the positive electrode active material coating is activated carbon; the negative electrode sheet comprises a negative electrode active material coating and three layers of a negative electrode current collector; the three layers of the negative electrode current collector are aluminum foil, and all the tabs of the aluminum foil are retained; the negative electrode active material coating is activated carbon.

[0047] The connection method between the core rod body 2 and the insulating sealing plug 24 is injection molding, crimping, etc. The core rod body 2 is made of metal, aluminum, copper or other high thermal conductivity materials; the insulating sealing plug 24 is made of rubber or plastic material. Its function is to seal the end of the core rod body 2 on the one hand, and to play an insulating role on the other hand to prevent the metal core rod body 2 from being charged, thereby preventing the coolant passing through the core rod body 2 from being charged.

[0048] The negative pole is made of metal aluminum, the pole sealing ring 67 is made of EPDM or fluororubber, the plastic insulating plate 66 is made of PP, the cover substrate 63 is made of metal aluminum, the plastic insulating block 68 is made of PPS, and the pole pressure plate 69 is made of metal. The negative pole is assembled by riveting and welding, and the sealing depends on the compression deformation of the pole sealing ring 67; the positive pole is made of metal aluminum, which is laser welded to the cover substrate 635; the core rod connector 64 is made of the same material as the core rod body 2, and the core rod insulating ring 65 is made of EPDM or fluororubber, and the assembly method is that the core rod connector 64 is riveted and deformed for sealing and fixing;

[0049] The negative electrode current collector 3, the positive electrode current collector 4 are laser welded to the winding core 1, the core rod positioning block 7 is laser welded to the positive electrode current collector 4, and the shell 5 is connected to the core rod positioning block 7 and the cover substrate 63 by laser welding; the negative electrode current collector 3 is made of aluminum and has the same shape as the winding core 1; the positive electrode current collector 4 is made of aluminum and has the same shape as the winding core 1.

[0050] The energy storage device can also be used on lithium batteries. When used on lithium batteries, the difference from the above embodiments is that the positive electrode active material coating is one or more of lithium iron phosphate, ternary, nickel-cobalt-manganese lithium; the negative electrode active material coating is graphite, soft carbon or hard carbon, and the three layers of the negative electrode current collector can be made of copper, and the negative electrode pole can be made of copper-aluminum friction composite welding material.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mandrel structure, characterized in that: The invention comprises a core rod body (2), wherein a cooling channel (21) is provided on the core rod body (2), and an outlet end (22) and an inlet end (23) of the cooling channel (21) are both located at one end of the core rod body (2).

2. A core rod structure and energy storage device according to claim 1, characterized in that: The cooling channel (21) has a U-shaped structure.

3. An energy storage device, characterized in that: The invention comprises a winding core (1), a negative electrode current collector (3), a positive electrode current collector (4), a shell (5) and a cover plate assembly (6); the winding core (1) is embedded with a core rod body (2) as claimed in any one of claims 1 to 2; the positive electrode current collector (4) and the negative electrode current collector (3) are respectively arranged at both ends of the winding core (1); the winding core (1) is sleeved with a shell (5) on the periphery; a cover plate assembly (6) is arranged at one end of the shell (5); and a positive electrode column (61) and a negative electrode column (62) are respectively arranged on the cover plate assembly (6); the positive electrode column (61) is connected to the positive electrode current collector (4), and the negative electrode column (62) is connected to the negative electrode current collector (3).

4. An energy storage device according to claim 3, characterized in that: The shell (5) is a barrel-shaped structure with one end open, the cover plate assembly (6) is installed on the open end of the shell (5), the other end of the shell (5) is provided with a positioning hole, one end of the mandrel body (2) is connected to the positioning hole through a positioning block (7), and the other end of the mandrel body (2) is peripherally sleeved on the inner ring of the cover plate assembly (6).

5. An energy storage device according to claim 5, characterized in that: One end of the core rod body (2) is plugged into an insulating sealing plug (24), and the insulating sealing plug (24) is connected to a positioning block (7).

6. An energy storage device according to claim 3, characterized in that: The cover plate assembly (6) comprises a cover plate base plate (63), a through hole is provided in the middle of the cover plate base plate (63), the outer periphery of the core rod body (2) is riveted into the through hole through a core rod connector (64) and a core rod insulating ring (65) in sequence, and the riveted core rod connector (64) can deform the core rod insulating ring (65), and the deformed core rod insulating ring (65) is used for sealing and insulation between the core rod connector (64) and the cover plate base plate (63).

7. An energy storage device according to claim 6, characterized in that: A plastic insulating plate (66) is arranged between the cover substrate (63) and the negative electrode collector (3) or the positive electrode collector (4); a pole through hole is arranged on the cover substrate (63); one end of the first pole is connected to the negative electrode collector (3) or the positive electrode collector (4); the other end of the first pole passes through the plastic insulating plate (66) and the pole through hole in sequence and is located above the cover substrate (63); and the first pole is a negative pole (62) or a positive pole (61).

8. An energy storage device according to claim 7, characterized in that: A pole sealing ring (67) and a plastic insulating block (68) are respectively arranged on the periphery of the first pole. The pole sealing ring (67) is sleeved in the pole through hole, and the plastic insulating block (68) is installed on the upper end of the cover plate substrate (63) through a pole pressing plate (69).

9. An energy storage device according to claim 6, characterized in that: The outer edge of the cover substrate (63) is fixedly connected to the inner edge of the open end of the shell (5), and a second pole is installed on the cover substrate (63), and the second pole is a positive pole (61) or a negative pole (62).

10. An energy storage device according to claim 6, characterized in that: The cover plate substrate (63) is provided with a liquid injection hole, and a sealing nail (610) is detachably installed in the liquid injection hole; An explosion-proof plate (611) is arranged on the cover plate substrate (63), and a film (612) is arranged on the explosion-proof plate (611).

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