CN218731279U - Cylindrical battery and battery module of integrated liquid cooling structure - Google Patents

Abstract

The utility model proposes a cylindrical battery and a battery module with an integrated liquid cooling structure. The cylindrical battery includes a shell, a winding core and a cover plate assembly. The shell has an accommodating chamber with one end open, and the winding core is arranged in the accommodating chamber. Indoors, the cover plate assembly is sealed at the open end of the casing and connected to the winding core; the cylindrical battery also includes a liquid cooling tube, one end of which is open, and the liquid cooling tube is arranged in the accommodating chamber and is coaxial with the casing. The central axis of the winding core is provided with a winding core hole, and the closed end of the liquid cooling tube passes through the winding core hole and is fixedly connected with the cover assembly. mouth. The cylindrical battery of the utility model can realize heat dissipation through its own integrated liquid cooling structure, without installing other heat dissipation structures on the cylindrical battery casing, the cylindrical battery is lighter, and avoids the complexity brought by the traditional heat dissipation structure and cylindrical battery assembly. At the same time, the energy density of the cylindrical battery module is greatly improved.

Description

A cylindrical battery and battery module with integrated liquid cooling structure

technical field

The utility model relates to the technical field of thermal management of cylindrical batteries, in particular to a cylindrical battery with an integrated liquid cooling structure and a battery module.

Background technique

When the power battery is in use, it needs to be at a suitable temperature to ensure its normal use. At present, after the batteries are grouped, there are many problems such as severe heating and uneven internal temperature distribution when charging and discharging at a high rate, which seriously affects the battery life. Common battery structures can be divided into square, soft pack and cylindrical batteries. Due to their large surface, square and soft packs ensure a large contact area with the liquid cooling plate for heat exchange and high heat transfer efficiency. Due to the special circular structure of the cylindrical battery, the liquid cooling plate often cannot effectively contact it, thereby dissipating the heat generated by the battery cell.

For the heat dissipation scheme of cylindrical batteries, the common forms are generally the bottom cold plate flat type or the serpentine tube winding type for heat conduction. The flat cold plate structure exchanges heat through contact with the end of the battery cell, and the temperature difference between the battery cells is large and the effect is poor. For example, the Chinese patent with the publication number CN114050347A discloses a cylindrical battery module, which utilizes serpentine liquid cooling tubes to be wound in the battery module for heat conduction. Make the serpentine liquid cooling tube close to the side of the cylindrical battery and pass through the gap between the sides of each cylindrical battery. The positive and negative electrodes of the cylindrical battery are respectively drawn from the top and bottom of the cylindrical battery. Although this heat dissipation method can improve the heat dissipation effect of cylindrical batteries, the assembly of serpentine liquid cooling tubes and multiple cylindrical batteries is complicated, especially for the heat dissipation of large-diameter cylindrical batteries. In addition to configuring multiple serpentine liquid cooling tubes in the battery module The cold pipes will also be equipped with flat liquid-cooled plates. These liquid-cooled pipes and/or liquid-cooled plates also need to be connected with each other through corresponding connecting parts. On the one hand, the battery module assembly structure is complicated, and on the other hand On the one hand, due to the addition of multiple liquid cooling components and other connecting components, the overall volume of the battery module increases and the energy density decreases.

Utility model content

In view of this, the utility model proposes a cylindrical battery and a battery module with an integrated liquid cooling structure to solve the problem of the low integration of the existing cylindrical battery and liquid cooling components, resulting in a battery composed of liquid cooling components and single batteries. The module has the problems of complex structure and low energy density.

The technical scheme of the utility model is achieved in that:

On the one hand, the utility model provides a cylindrical battery with an integrated liquid cooling structure. The cylindrical battery includes a casing, a winding core and a cover assembly. The casing has an accommodating chamber with one end open. The winding core Arranged in the accommodating chamber, the cover plate assembly is sealingly arranged on the open end of the housing and connected with the winding core;

The cylindrical battery also includes a liquid cooling tube, one end of the liquid cooling tube is open and the other end is closed, the liquid cooling tube is arranged in the accommodating chamber and is coaxial with the housing, and the liquid cooling tube has One end of the opening is fixedly connected to the inner bottom surface of the accommodating chamber, a winding core hole is provided at the central axis of the winding core, and the closed end of the liquid cooling tube passes through the winding core hole and is connected with the cover plate assembly Fixedly connected, the outer bottom surface of the housing is provided with a liquid inlet and a liquid outlet communicating with the inner cavity of the liquid cooling tube.

On the basis of the above technical solution, preferably, a baffle is provided at the central axis of the liquid-cooled tube, one end of the baffle is fixedly connected to the inner bottom surface of the accommodating chamber, and the other end of the baffle faces toward the The closed end of the liquid cooling tube is extended, and the partition plate divides the inner cavity of the liquid cooling tube into a liquid inlet chamber and a liquid outlet chamber that communicate with each other, and the liquid inlet is connected to the liquid inlet chamber. The liquid outlet is in communication with the liquid outlet chamber.

As some embodiments, the liquid inlet chamber and the liquid outlet chamber are provided with a plurality of cooling fins along the radial direction of the liquid cooling tube, and the plurality of cooling fins are arranged along the radial direction of the liquid cooling tube, etc. Arranged at intervals, there is a gap between the end of the heat dissipation fins away from the liquid inlet and the inner top surface of the liquid cooling tube.

As another example, the liquid inlet chamber and the liquid outlet chamber are provided with a plurality of heat dissipation pipes along the radial direction of the liquid cooling pipe, and the plurality of heat dissipation pipes are honeycomb-shaped along the radial direction of the liquid cooling pipe Arranged, there is a gap between the end of the heat dissipation pipe away from the liquid inlet and the inner top surface of the liquid cooling pipe.

On the basis of the above technical solution, preferably, the outer peripheral wall of the liquid cooling tube is wrapped with an insulating film.

On the basis of the above technical solution, preferably, the cover plate assembly includes a top cover and two electrode assemblies, the center of the top cover is provided with a mounting hole for the liquid cooling pipe to pass through, and the two electrode assemblies are opposite to each other. The mounting holes are symmetrically fixed on the top cover, and the two electrode assemblies are respectively connected to the positive tab and the negative tab on the winding core.

Further, preferably, the cover plate assembly also includes a lower insulator located on the bottom surface of the top cover, the electrode assembly includes a pole, an upper insulator, a pressing block and a current collector, the pressing block, the upper insulating member, the top cover and the lower insulator are stacked in sequence, and the pole is riveted through the lower insulator, the top cover, the upper insulator and the pressing block in sequence, and one end of the current collector is connected to the pole, and the other end is connected to the coil The tabs on the core are connected.

Furthermore, preferably, the electrode assembly further includes a sealing member, the sealing member includes a first sealing part and a second sealing part connected to each other, and the top cover is provided with a connecting hole for the pole to pass through. , the first sealing part is arranged in the connection hole, and is pressed between the inner wall of the connection hole and the cylinder, and the lower insulating member is provided with an annular groove surrounding the connection hole, The second sealing portion is accommodated in the annular groove.

Preferably, the top cover is also provided with a liquid injection hole and an explosion-proof valve.

On the other hand, the utility model also discloses a battery module, which includes a plurality of the cylindrical batteries, and the plurality of cylindrical batteries are arranged side by side.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The utility model discloses a cylindrical battery. By fixing a liquid-cooled tube at the central axis of the shell, inserting the core into the shell, the liquid-cooled tube passes through the core hole on the core to fix it with the cover assembly Connection, by setting a liquid inlet and a liquid outlet connected to the liquid-cooled inner cavity on the outer bottom of the housing, the cooling medium can be circulated into the liquid-cooled tube, thereby realizing the heat dissipation of the winding core inside the housing. A cylindrical battery is formed by integrating a liquid-cooled tube inside the shell, and the winding core is sleeved on the liquid-cooled tube. In the process of forming a battery module from a cylindrical battery, the cylindrical battery can dissipate heat through its own integrated liquid-cooled structure without the need for Installing other heat dissipation structures on the cylindrical battery casing, the cylindrical battery is lighter, avoiding the complexity brought by the traditional heat dissipation structure and cylindrical battery assembly, and greatly improving the energy density of the cylindrical battery module;

(2) By arranging a liquid cooling tube in the middle of the shell and dissipating heat from the middle of the winding core, the center temperature of the cylindrical battery during charging and discharging can be greatly reduced, avoiding thermal runaway caused by excessive center temperature of the cylindrical battery;

(3) By arranging a plurality of heat dissipation fins or heat dissipation pipes in both the liquid inlet chamber and the liquid discharge chamber, on the one hand, the heat exchange area of the cooling liquid can be increased through the heat dissipation fins or heat dissipation pipes; The heat dissipation fins or heat dissipation pipes are arranged at equal intervals along the radial direction of the liquid cooling pipe, so that the cooling liquid flow between the heat dissipation fins or heat dissipation pipes can be uniform, and the heat dissipation in the middle of the winding core can be evenly distributed;

(4) By arranging two electrode assemblies on the top cover, the positive and negative electrodes are at the same end of the cylindrical battery, so that the space utilization rate of the battery is improved, and the energy density of the battery is further improved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a three-dimensional structural schematic diagram of a cylindrical battery with an integrated liquid cooling structure disclosed by the utility model;

Fig. 2 is a schematic diagram of the explosion structure of the cylindrical battery with integrated liquid cooling structure disclosed by the utility model;

Fig. 3 is a structural schematic diagram of the housing disclosed by the utility model;

Fig. 4 is a plan view of the assembly structure of the liquid cooling tube and the shell disclosed by the utility model;

Fig. 5 is a plane sectional view of the liquid cooling tube A-A disclosed by the utility model;

Fig. 6 is a plane sectional view of the liquid cooling tube A-A disclosed by the utility model;

Fig. 7 is a plane sectional view of a cylindrical battery with an integrated liquid cooling structure disclosed by the utility model;

Fig. 8 is a partial enlarged view of place B in Fig. 7;

Fig. 9 is a schematic diagram of the three-dimensional structure of the cover plate assembly disclosed by the utility model;

Drawing logo:

1. Housing; 2. Rolling core; 3. Cover assembly; 10. Accommodating chamber; 4. Liquid cooling tube; 11. Liquid inlet; 12. Liquid outlet; 20. Rolling core hole; 41. Partition Plate; 411, liquid inlet chamber; 412, liquid outlet chamber; 42, heat dissipation fin; 43, heat dissipation pipe; 44, insulating film; 31, top cover; 32, electrode assembly; 310, installation hole; 33, lower Insulator; 321, pole; 322, upper insulator; 323, pressing block; 324, current collector; 325, seal; 3251, first sealing part; 3252, second sealing part; 311, connection hole; 331, Annular groove; 313, liquid injection hole; 314, explosion-proof valve.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the prior art, cylindrical batteries are usually packed into battery modules and used in new energy vehicles or other fields of electricity consumption. In order to realize heat dissipation for cylindrical batteries, serpentine liquid-cooled tubes are mostly used to conduct heat conduction in battery modules. Although this heat dissipation method can improve the heat dissipation effect of cylindrical batteries, the assembly of serpentine liquid cooling tubes and multiple cylindrical batteries is complicated, especially for the heat dissipation of large-diameter cylindrical batteries. In addition to configuring multiple serpentine liquid cooling tubes in the battery module tubes, and will also be equipped with flat liquid-cooled plates. These liquid-cooled tubes and/or liquid-cooled plates also need to be connected to each other through corresponding connecting parts. On the one hand, the assembly structure of the battery module is complicated. , due to the addition of multiple liquid cooling components and other connecting components, the overall volume of the battery module increases and the energy density decreases.

Cylindrical batteries and liquid-cooled components in the prior art are independent of each other and are only connected when forming a battery module, and the degree of integration between them is relatively low. Complex structure and low energy density.

For this reason, in order to solve the above problems, the solution proposed by the embodiment of the present invention is to provide a cylindrical battery and battery module with an integrated liquid cooling structure, as shown in Figure 1, combined with Figures 2 and 3, the embodiment of the present invention The cylindrical battery includes a casing 1, a winding core 2 and a cover plate assembly 3. The casing 1 has an accommodating chamber 10 with one end open, the winding core 2 is arranged in the accommodating chamber 10, and the cover plate assembly 3 is sealed and arranged in the casing. The open end of the body 1 is connected with the winding core 2.

In order to integrate the liquid cooling components on the cylindrical battery, the cylindrical battery of this embodiment also includes a liquid cooling tube 4, one end of which is open and the other end is closed. The body 1 is coaxial, the open end of the liquid cooling tube 4 is fixedly connected to the inner bottom surface of the accommodating chamber 10, the central axis of the winding core 2 is provided with a core hole 20, and the closed end of the liquid cooling tube 4 passes through the core hole 20 and is fixedly connected with the cover plate assembly 3 , the outer bottom surface of the housing 1 is provided with a liquid inlet 11 and a liquid outlet 12 communicating with the inner cavity of the liquid cooling tube 4 .

With the above structure, by fixing the liquid cooling tube 4 at the central axis of the housing 1, inserting the winding core 2 into the housing 1, the liquid cooling tube 4 passes through the winding core hole 20 on the winding core 2 to connect with the cover. The plate assembly 3 is fixedly connected, and by setting the liquid inlet 11 and the liquid cooling outlet connected to the liquid cooling inner cavity on the outer bottom surface of the housing 1, the cooling medium can be circulated into the liquid cooling tube 4, thereby realizing the cooling of the housing. 1 inside the winding core 2 for heat dissipation. The cylindrical battery is formed by integrating the liquid cooling tube 4 inside the housing 1, and the winding core 2 is sleeved on the liquid cooling tube 4. When the cylindrical battery forms a battery module, the cylindrical battery can be cooled by its own integrated liquid cooling structure. To achieve heat dissipation, there is no need to install other heat dissipation structures on the single battery shell, and the cylindrical battery is lighter in weight, avoiding the complexity brought by the traditional heat dissipation structure and cylindrical battery assembly, and greatly improving the energy density of the cylindrical battery module.

In addition, in the prior art, the structure of laying a horizontal liquid cold plate on the bottom surface of the cylindrical battery and winding the serpentine liquid cold plate on the outer surface of the cylindrical battery only dissipates heat from the outer surface of the cylindrical battery, but the energy density of the winding core 2 in the cylindrical battery Higher, during the charging and discharging process of the cylindrical battery, the temperature in the middle is the highest, and the heat in the middle of the cylindrical battery is slowly transferred to the outer periphery. However, in the prior art, the surface of the cylindrical battery cannot be cooled immediately The central part conducts heat dissipation. During the use of high-power or large cylindrical batteries, when the temperature of the center of the cylindrical battery is too high, it is easy to cause thermal runaway and cause the cylindrical battery to explode.

However, in the embodiment of the present invention, by setting the liquid cooling tube 4 in the middle of the shell 1 and dissipating heat in the middle of the winding core 2, the central temperature of the cylindrical battery during charging and discharging can be greatly reduced, and thermal runaway caused by excessively high central temperature of the cylindrical battery can be avoided.

In order to realize the circulation of the cooling liquid in the liquid-cooled tube 4 , in this embodiment, a partition 41 is provided at the central axis of the liquid-cooled tube 4 , and one end of the partition 41 is fixedly connected to the inner bottom surface of the accommodating chamber 10 , and the partition 41 The other end extends toward the closed end of the liquid cooling tube 4, and the separator 41 divides the inner cavity of the liquid cooling tube 4 into a liquid inlet chamber 411 and a liquid outlet chamber 412 that communicate with each other. The liquid inlet 11 and the liquid inlet chamber 411 The liquid outlet 12 communicates with the liquid outlet chamber 412 . Thus, the coolant enters the liquid inlet chamber 411 through the liquid inlet 11, flows upward along the axial direction of the cylindrical battery, and then flows into the liquid outlet chamber through the channel between the top surface of the separator 41 and the liquid cooling tube 4 412, and finally discharged through the liquid outlet 12, the cooling liquid flows up and down in the liquid inlet chamber 411 and the liquid outlet chamber 412, on the one hand, it can realize the circulation of the cooling liquid in the inner cavity of the liquid cooling tube 4, on the other hand , it can be realized that the cooling liquid inside the liquid-cooled tube 4 is always in a state of uniform temperature, thereby achieving uniform heat exchange in the middle of the winding core 2 .

Referring to Figures 4-6, in order to improve the heat dissipation efficiency in the middle of the winding core 2, the liquid inlet chamber 411 and the liquid outlet chamber 412 are provided with a plurality of cooling fins 42 along the axial direction of the liquid cooling tube 4. The cooling fins 42 are arranged at equal intervals along the radial direction of the liquid cooling tube 4 , and there is a gap between the end of the cooling fins away from the liquid inlet and the inner top surface of the liquid cooling tube. Therefore, it can be ensured that the coolant in the liquid inlet chamber and the liquid outlet chamber can circulate without being blocked by the cooling fins.

The liquid inlet chamber 411 and the liquid outlet chamber 412 are provided with a plurality of heat dissipation pipes 43 along the axial direction of the liquid cooling pipe 4. The plurality of heat dissipation pipes 43 are arranged in a honeycomb shape along the radial direction of the liquid cooling pipe 4. The heat dissipation pipes There is a gap between the end away from the liquid inlet and the inner top surface of the liquid cooling tube. Therefore, it can be ensured that the coolant in the liquid inlet chamber and the liquid outlet chamber can circulate without being blocked by the heat dissipation pipe.

It is worth noting that the two sides in the width direction of the cooling fins are connected to the side walls of the liquid cooling tubes, the cooling tubes are arranged in a honeycomb shape, the side walls of two adjacent cooling tubes are connected to each other, and the outermost cooling tube is connected to the The side walls of the inner cavity of the liquid cooling tube are connected.

By adopting the above-mentioned technical scheme, on the one hand, the heat exchange area of the cooling liquid can be increased through the heat dissipation fins 42 or the heat dissipation pipes 43; The spaced arrangement can make the coolant flow between the heat dissipation fins 42 or the heat dissipation pipes 43 uniform, thereby making the middle part of the winding core 2 evenly dissipate heat.

In this embodiment, the liquid cooling tube 4 is made of metal, preferably the same material as the housing 1. In order to avoid a short circuit between the housing 1 and the winding core 2, the outer peripheral wall of the liquid cooling tube 4 is wrapped with insulating The film 44 realizes the electrical isolation between the liquid cooling tube 4 and the core 2 .

As some preferred implementation modes, referring to the accompanying drawings 7-9, the cover plate assembly 3 includes a top cover 31 and two electrode assemblies 32, and the center of the top cover 31 is provided with an installation hole 310 for the liquid cooling tube 4 to pass through. After the tube 4 passes through the installation hole 310, it is flush with the outer surface of the top cover 31, and the connection between the liquid cooling tube 4 and the top cover 31 is welded, so that the liquid cooling tube 4 can be kept between the casing 1 and the top cover 31. fixed. The two electrode assemblies 32 are symmetrically fixed on the top cover 31 with respect to the installation hole 310 , and the two electrode assemblies 32 are respectively connected to the positive tab and the negative tab on the winding core 2 . By arranging two electrode assemblies 32 on the top cover 31, the positive and negative electrodes are at the same end of the cylindrical battery, so that the space utilization rate of the battery is improved, and the energy density of the battery is further improved.

In this embodiment, the cover plate assembly 3 further includes a lower insulator 33 located on the bottom surface of the top cover 31. The electrode assembly 32 includes a pole 321, an upper insulator 322, a pressing block 323 and a current collector 324. The pressing block 323, the upper insulator 322, the top cover 31 and the lower insulator 33 are sequentially stacked, and the pole 321 passes through the lower insulator 33, the top cover 31, the upper insulator 322 and the pressing block 323 in sequence for riveting , one end of the current collector 324 is connected to the pole 321 , and the other end is connected to the tab on the winding core 2 . In this way, the pole 321 passes through the lower insulator 33, the top cover 31, and the upper insulator 322 and then is riveted with the pressing block 323 to realize riveting and fixing the pole 321 and the top cover 31, and the lower insulator 33 is set Between the current collector 324 and the top cover 31 , contact short circuit between the current collector 324 and the top cover 31 can be avoided. In this embodiment, the riveting process of the pole 321 belongs to the prior art.

In this embodiment, the electrode assembly 32 further includes a sealing member 325, and the sealing member 325 includes a first sealing portion 3251 and a second sealing portion 3252 connected to each other. through the connecting hole 311, the first sealing part 3251 is arranged in the connecting hole 311, and is pressed between the inner wall of the connecting hole 311 and the pole 321, and the lower insulating member 33 is provided with Surrounding the annular groove 331 of the connecting hole 311 , the second sealing portion 3252 is accommodated in the annular groove 331 . Through the setting of the first sealing part 3251, the gap between the pole 321 and the connection hole 311 can be sealed, so as to prevent the electrolyte from leaking from the gap between the pole 321 and the connection hole 311 and inserting into the annular groove through the second sealing part 3252 In 331, the upper part of the second sealing part 3252 is against the top cover 31, and the lower part is against the pole 321, which can realize the sealing between the lower insulating part 33 and the top cover 31, and prevent the electrolyte from passing through the lower insulating part 33 and the top cover 31 The gap between leaks.

In this embodiment, the top cover 31 is also provided with a liquid injection hole 313 and an explosion-proof valve 314. Through the liquid injection hole 313, the electrolyte can be added to the housing 1. Through the explosion-proof valve 314, when the internal pressure of the battery is too high , to relieve pressure.

The utility model also discloses a battery module, which comprises a plurality of the cylindrical batteries, and the plurality of cylindrical batteries are arranged side by side. In the process of forming a battery module from a cylindrical battery, the cylindrical battery can dissipate heat through its own integrated liquid cooling structure, without installing other heat dissipation structures on the cylindrical battery casing, and the cylindrical battery is lighter in weight, avoiding the traditional heat dissipation structure and cylindrical battery assembly The degree of complexity brought by it greatly improves the energy density of the cylindrical battery module.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the utility model. within the scope of the new protection.

Claims (10)

1. A cylindrical battery with an integrated liquid cooling structure comprises a shell (1), a winding core (2) and a cover plate assembly (3), wherein an accommodating cavity (10) with an opening at one end is formed in the shell (1), the winding core (2) is arranged in the accommodating cavity (10), and the cover plate assembly (3) is hermetically arranged at the opening end of the shell (1) and connected with the winding core (2);

the method is characterized in that: the cylinder battery still includes liquid cooling pipe (4), liquid cooling pipe (4) one end opening, the other end is sealed, liquid cooling pipe (4) set up in holding chamber (10) and with casing (1) is coaxial, liquid cooling pipe (4) have open-ended one end with bottom fixed connection in holding chamber (10), the central axis department of rolling up core (2) is provided with rolls up core hole (20), liquid cooling pipe (4) confined one end is passed roll up core hole (20) and with apron subassembly (3) fixed connection, casing (1) outer bottom surface be provided with inlet (11) and liquid outlet (12) that liquid cooling pipe (4) inner chamber is linked together.

2. The cylindrical battery of integrated liquid-cooled structure of claim 1, wherein: center axis department is provided with baffle (41) in liquid cooling pipe (4), the one end of baffle (41) with bottom fixed connection in accommodation chamber (10), the other end of baffle (41) court the blind end of liquid cooling pipe (4) extends, baffle (41) will liquid cooling pipe (4) inner chamber is cut apart into feed liquor cavity (411) and play liquid cavity (412) that communicate each other, inlet (11) with feed liquor cavity (411) are linked together, liquid outlet (12) with it is linked together to go out liquid cavity (412).

3. The cylindrical battery of integrated liquid-cooled structure of claim 2, wherein: liquid inlet cavity (411) and play liquid cavity (412) all are provided with a plurality of radiating fin (42) along the axial direction of liquid cooling pipe (4), and are a plurality of radiating fin (42) are followed liquid cooling pipe (4) radial direction is equidistant to be arranged, radiating fin (42) keep away from the one end of inlet (11) and liquid cooling pipe (4) interior top surface between be provided with the clearance.

4. The cylindrical battery with integrated liquid cooling structure of claim 2, wherein: liquid inlet chamber (411) and play liquid chamber (412) all are provided with a plurality of cooling tubes (43) along the axial direction of liquid cooling pipe (4), and are a plurality of cooling tube (43) are followed liquid cooling pipe (4) radially are cellular and arrange, be provided with the clearance between the one end that inlet (11) were kept away from in cooling tube (43) and the interior top surface of liquid cooling pipe (4).

5. The cylindrical battery of integrated liquid-cooled structure of claim 1, wherein: the outer peripheral wall of the liquid cooling pipe (4) is wrapped with an insulating film (44).

6. The cylindrical battery of integrated liquid-cooled structure of claim 1, wherein: the cover plate assembly (3) comprises a top cover (31) and two electrode assemblies (32), a mounting hole (310) for a liquid cooling pipe (4) to pass through is formed in the center of the top cover (31), the two electrode assemblies (32) are symmetrically and fixedly arranged on the top cover (31) relative to the mounting hole (310), and the two electrode assemblies (32) are respectively connected with a positive electrode lug and a negative electrode lug on the winding core (2).

7. The cylindrical battery of integrated liquid cooled structure of claim 6, wherein: apron subassembly (3) is still including lower insulating part (33) that is located top cap (31) bottom surface, electrode subassembly (32) include utmost point post (321), go up insulating part (322), briquetting (323) and mass flow body (324), briquetting (323), last insulating part (322), top cap (31) and lower insulating part (33) are range upon range of in order and are set up, utmost point post (321) are passed in order insulator (33), top cap (31), upward insulating part (322) and briquetting (323) are riveted down, mass flow body (324) one end with utmost point post (321) are connected, the other end with utmost point ear on rolling up core (2) is connected.

8. The cylindrical battery of integrated liquid cooled structure of claim 7, wherein: the electrode assembly (32) further comprises a sealing element (325), the sealing element (325) comprises a first sealing portion (3251) and a second sealing portion (3252) which are connected with each other, a connecting hole (311) through which the pole (321) penetrates is formed in the top cover (31), the first sealing portion (3251) is arranged in the connecting hole (311) and abuts against the inner wall of the connecting hole (311) and the pole (321), an annular groove (331) surrounding the connecting hole (311) is formed in the lower insulating piece (33), and the second sealing portion (3252) is accommodated in the annular groove (331).

9. The cylindrical battery of integrated liquid cooled structure of claim 6, wherein: the top cover (31) is also provided with a liquid injection hole (313) and an explosion-proof valve (314).

10. A battery module, its characterized in that: comprising a plurality of cylindrical batteries according to any one of claims 1 to 9, arranged side by side.

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