CN116544547A - A three-sided liquid-cooled large cylindrical battery system - Google Patents

Abstract

The invention discloses a three-side liquid-cooled large cylindrical battery system, which comprises: the power battery module comprises at least one battery module, and a plurality of rows of electric cores are uniformly distributed in the battery module; the liquid cooling system comprises liquid cooling pipes positioned at two sides of the power battery module and a liquid cooling plate positioned at the top of the power battery module; wherein a plurality of spaced cooling plates which are linearly arranged are clamped between the liquid cooling pipes at the two sides of the power battery module, one spaced cooling plate is distributed at the two sides of each row of battery cells, the interval cooling plate is connected with the battery core through heat conduction glue, and the liquid cooling plate is connected with the battery core through heat conduction glue. The invention can solve the problem of pain points in use and endurance worry of the current new energy vehicle, and can ensure the temperature control property of the battery system under ultrahigh-rate charging and meet the actual overcharging requirement through innovative and efficient three-side liquid cooling system design in order to solve the gradually increased rapid charging requirement of users.

Description

A three-sided liquid-cooled large cylindrical battery system

technical field

The invention relates to the technical field of power batteries, in particular to a three-sided liquid-cooled large cylindrical battery system.

Background technique

At present, the power battery cells of electric vehicles and energy storage systems mainly have structural forms such as cylindrical batteries, square batteries and pouch batteries. Cylindrical winding battery cells are the earliest, most mature, and most stable lithium-ion batteries. The production process is mature. The standardization, consistency, and safety of batteries are high. The overall cost is also low, and the assembled battery modules have high energy density. , are widely used in electric vehicles and energy storage systems of many companies.

Cylindrical batteries have a small cell capacity and require a large number of cells. Temperature differences are prone to occur inside the battery. It is necessary to strengthen heat dissipation management to improve the uniformity of temperature distribution. With the continuous improvement of the structural size and energy density of the battery module, due to the limitation of cost, structure and reliability, the challenge of the temperature uniformity of the battery module is also increasing. Too high or too low ambient temperature will affect the performance and life of the lithium battery. Therefore, the battery system should be cooled when the temperature is high in summer, and the battery system should be heated when the temperature is low in winter, so that the battery is in an appropriate temperature range to ensure its safety. performance, efficiency and longevity.

The liquid cooling methods used in cylindrical battery systems in the industry all adopt a single-sided liquid cooling solution. The cooling efficiency of single-sided liquid cooling is low, and it cannot meet the charging requirements of ultra-high rates; when the demand for overcharging gradually increases, the heat generation of the system The larger the size, the higher the cooling efficiency requirements; at the same time, in order to store more power in a smaller volume and provide higher battery life, the requirements for system integration efficiency gradually increase; when users use it, the product's Absolute safety is the first condition to ensure system application.

Contents of the invention

In order to overcome at least one defect of the above-mentioned prior art, the present invention provides a three-sided liquid-cooled large cylindrical battery system. It can solve the pain points of current new energy vehicles and worry about battery life. In order to solve the increasing fast charging needs of users, the innovative and efficient three-sided liquid cooling system design can ensure the temperature control of the battery system under ultra-high rate charging, and meet the Actual overcharging needs.

The technical scheme that the present invention adopts for solving its problem is:

A three-sided liquid-cooled large cylindrical battery system, comprising: a power battery module, the power battery module contains at least one battery module, and multiple rows of battery cells are evenly distributed in the battery module; a liquid cooling system, the The liquid cooling system includes liquid cooling tubes on both sides of the power battery module and a liquid cooling plate on the top of the power battery module; wherein, a plurality of linear rows are sandwiched between the liquid cooling tubes on both sides of the power battery module There is a spaced cooling plate distributed on both sides of each row of battery cells, the spaced cooling plate is connected to the battery cells through thermal conductive glue, and the liquid cooling plate is connected to the battery cores through thermal conductive glue.

By adopting the above scheme, each battery cell has three-sided cooling, forming three-dimensional liquid cooling and heat dissipation, quickly taking away the heat generated by the system overcharging, and effectively reducing the temperature of the system. Connected as a whole, improve the overall strength, ensure the rigidity and strength requirements, and ensure the reliability of the system.

Further, the liquid cooling tubes on both sides of the power battery module are spliced by a plurality of tubular liquid cooling sections, and every two tubular liquid cooling sections are connected to a spaced cooling plate, and two A spacer cooling plate is clamped between the tubular liquid cooling sections so that there is a spacer cooling plate on both sides of each row of cells in the power battery module. The three sides of the battery core are cooled.

By adopting the above solution, the structure of the liquid cooling tube is further restricted, the connection stability of the spacer cooling plate is improved, and the side cooling effect is provided for the battery core.

Further, a system housing is also included, and the system housing is used for accommodating and fixing the power battery module and the liquid cooling system.

By adopting the above scheme, the integrated design of the system is realized, and the minimal process and structural design are adopted to simplify the product complexity and improve the system integration.

Further, the system housing includes an upper housing and a lower housing, and the upper housing and the lower housing are detachably connected.

By adopting the above solution, it is convenient for disassembly and maintenance.

Further, a support structure is provided between the lower case and the power battery module, and the support structure separates the bottom surface of the cell from the lower case to form an independent pressure relief space.

By adopting the above scheme, through independent pressure relief, the gas can be quickly released, and thermal runaway response can be realized quickly, and rapid warning can be achieved.

Further, the supporting structure includes a supporting plate and at least two supporting parts, the supporting plate is erected by the supporting parts, and several pressure relief ports are arranged on the supporting plate.

By adopting the above scheme, an independent pressure relief channel of the system is formed, and the pressure relief is fast.

Further, the battery module also includes a battery tray, on which a plurality of slots are arranged in the same direction as the interval cooling plate, and in the center of the battery tray are provided a number of cylindrical grooves, through which the cylindrical grooves Each slot is divided into a multi-row structure, and the rows are arranged in a staggered manner.

By adopting the above solution, it is convenient to install the spaced cooling plates, and the staggered spaced cooling plates can maximize the use of space, increase the number of battery cells and have efficient cooling.

Further, the battery tray is filled with heat-conducting glue, so that the cooling plate in the battery tray is fixedly connected to the slot, and the cylindrical slot is fixedly connected to the battery cell.

By adopting the above solution, the battery tray is sealed as a whole, and the heat conduction effect and its own strength are improved.

Further, the two ends of the interval cooling plate are provided with connection parts, and the connection parts are provided with liquid flow holes for communicating with the tubular liquid cooling section.

By adopting the above solution, the tubular liquid cooling section is connected through the connecting portion, which can be used to communicate with the cooling liquid.

Further, the spaced cooling plate and the connection part are hollow inside, so as to circulate the cooling liquid through the liquid flow hole.

By adopting the above solution, the cooling liquid in the tubular liquid cooling section can be passed into the interior of the spaced cooling plate to cool both sides of the cell.

Further, the closer the connection part is to the liquid flow hole, the smaller the inner space is for converging the cooling liquid.

By adopting the above-mentioned solution, the cooling liquid can circulate and flow, effectively cool down, and effectively improve the speed of energy replenishment and user experience.

In summary, the three-sided liquid-cooled large cylindrical battery system provided by the present invention has the following technical effects:

1. By designing a three-sided liquid-cooled structure, it can achieve ultra-high rate and fast charging, effectively improving the speed of energy replenishment and user experience;

2. The system as a whole uses thermally conductive adhesive to form an integrated structure, which effectively improves volume utilization efficiency and quality utilization efficiency, realizes high specific energy in a small space, and improves battery life;

3. Through the design of interval cooling plates, the heat accumulation between each row of cells can be effectively avoided, and the difficulty of heat dissipation can be reduced;

4. Through three-sided liquid cooling, the internal temperature of the battery system can be reduced, thereby increasing the passing current, which can meet the needs of ultra-high fast charging at a lower cost.

Description of drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a system housing according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of an explosion structure of an embodiment of the present invention;

3 is a schematic diagram of a three-dimensional structure of a power battery module according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of the side structure of the power battery module according to the embodiment of the present invention;

Fig. 5 is an enlarged view of area A in Fig. 4;

Fig. 6 is a schematic diagram of a partial explosion structure of an embodiment of the present invention;

Fig. 7 is an enlarged view of area B in Fig. 6;

Figure 8 is an enlarged view of area C in Figure 6;

Fig. 9 is a schematic diagram of the structure of the spaced cooling plate according to the embodiment of the present invention.

Among them, the reference signs have the following meanings:

1. Power battery module; 11. Battery module; 111. Battery cell; 2. System housing; 21. Upper housing; 22. Lower housing; 23. Side plate; 231. Battery charging port; 232. Liquid cooling Water inlet; 233, liquid cooling water outlet; 3, liquid cooling system; 31, liquid cooling tube; 311, tubular liquid cooling section; 32, liquid cooling plate; Connection part; 332, flow hole; 333, quick connection pipe; 34, liquid cooling main pipe; 35, tee head; 36, curved pipe; 4, support structure; 41, supporting plate; 5. Independent pressure relief space; 6. Battery tray; 61. Slot; 62. Cylindrical groove.

Detailed ways

In order to better understand and implement, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not All the examples are based on the embodiments of the present invention, and all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In order to facilitate the understanding of the embodiments of the present invention, specific embodiments will be taken as examples for further explanation below in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Embodiment 1 of the present invention is shown in FIG. 3-FIG. 6. The present invention discloses a three-sided liquid-cooled large cylindrical battery system, including a power battery module 1 and a liquid cooling system 3. The power battery module 1 contains Including at least one battery module 11, the battery module is evenly distributed with multiple rows of cells 111; in this embodiment 1, the battery module 11 includes three, and there is a distance between each other; the liquid cooling The system 3 includes liquid cooling tubes 31 located on both sides of the power battery module 1 and a liquid cooling plate 32 located on the top of the power battery module 1. The channel 321 is a closed channel with an irregular direction; the liquid-cooled pipe 31 is formed by splicing a plurality of tubular liquid-cooled sections 311, and every two tubular liquid-cooled sections 311 are connected to a spaced cooling plate 33, and the two A spaced cooling plate 33 is clamped between two tubular liquid-cooled sections 311 at the same position, so that there is a spaced cooling plate 33 on both sides of each row of cells 111 in the power battery module 1, through stacking The intervening cooling plate 33 combined with the liquid cooling plate 32 realizes the three-sided cooling of the battery cell 111, so that each battery cell 111 has three-sided cooling, forming three-dimensional liquid cooling and heat dissipation, and the thermal energy generated by the system overcharging Take it away quickly and efficiently reduce the temperature of the system.

It should be noted that, in this embodiment 1, the cross-section of the spaced cooling plate 33 is wavy and corrugated as a whole. In other embodiments, the cross-section of the spaced cooling plate 33 includes but is not limited to a straight line, a curved line , a semicircular line or a zigzag line, for placing the electric core 111 in the gap between the cooling plates 33 through multiple stacks.

Specifically, the liquid cooling pipes 31 on the same side of the three battery modules 11 converge on a liquid cooling main pipe 34, and there are two liquid cooling main pipes 34 on the left and right sides, which are used as the water inlet pipe and the water outlet pipe of the liquid cooling system 3. , so as to realize the cooling liquid circulation of the liquid cooling system 3 . In this embodiment 1, the connection method between the liquid cooling pipe 31 and the liquid cooling main pipe 34 is to use a tee head 35 and a curved pipe 36 to connect, and one end of the curved pipe 36 is connected to the liquid cooling pipe 36 through a tee. On the main pipe 34, the other end is connected to the liquid cooling pipe 31 through a control joint; in other embodiments, the connection methods of the liquid cooling pipe 31 and the liquid cooling main pipe 34 include but are not limited to welding, threaded connection or adhesive connection .

It should be noted that when the liquid cooling pipe 31 is connected to the end of the liquid cooling main pipe 34, one end of the tee needs to be blocked to realize the sealing of the pipe.

Referring to Figures 1 and 2, the system of the present invention may further include a system housing 2, which is used to accommodate and fix the power battery module 1 and the liquid cooling system 3, so as to realize the integrated design of the system , using minimalist process and structural design to simplify product complexity and improve system integration. Specifically, the system housing 2 includes an upper housing 21, a lower housing 22 and a side plate 23, the upper housing 21 and the lower housing 22 are detachably connected, which is convenient for disassembly and maintenance, and the side plate 23 Located on one side of the upper case 21 and the lower case 22, the side plate 23 is provided with a battery charging port 231, a liquid cooling water inlet 232 and a liquid cooling water outlet 233, and the battery charging port 231 is used for the The power battery module 1 is charged, and the liquid cooling water inlet 232 and the liquid cooling water outlet 233 are used to circulate the cooling liquid in the liquid cooling system 3 .

In Embodiment 1, the upper case 21 and the lower case 22 are fixedly connected through screw holes. In other embodiments, the fixing method of the upper case 21 and the lower case 22 is not specifically limited. Including but not limited to glue fixing, welding, clamping or integral connection.

As an embodiment of the present invention, the spaced cooling plate 33 in the battery module 11 is connected to the battery cell 111 through thermally conductive glue, and the liquid cooling plate 32 is connected to the battery cell 111 through thermally conductive glue, so that the The battery module 11 is bonded as a whole to improve the overall strength, ensure the rigidity and strength requirements, and ensure the reliability of the system.

As an embodiment of the present invention, the battery module 11 adopts glue pouring process to adhere and fix the spacer cooling plate 33 and the battery cell 111, which can improve the overall strength while conducting heat, ensure the rigidity and strength requirements, and ensure the reliability of the system .

2, 3 and 5, a support structure 4 is provided between the lower case 22 and the power battery module 1, and the support structure 4 connects the bottom surface of the battery cell 111 to the lower case 22. Separated to form an independent pressure relief space 5, through independent pressure relief, the gas can be quickly released, and achieve thermal runaway extremely fast response and rapid warning. The supporting structure 4 includes a supporting plate 41 and at least two supporting parts 42, the supporting plate 41 is erected by the supporting parts 42, and a number of pressure relief ports 411 are arranged on the supporting plate 41. Among them, the three battery modules 11 are arranged on the supporting plate 41, and the two ends of the supporting plate 41 are respectively fixed on the side walls of the two supporting parts 42. The fixing method is not specifically limited, including but not limited to welding, gluing or Inserting, the pressure relief port 411 on the support plate 41 corresponds to the number of the battery cells 111 one by one, realizing an independent pressure relief space 5; Below the two bottom edges, the supporting effect is good, and the inner wall of the lower housing 22 is also provided with a backing plate corresponding to the lower part of the battery module 11, which can be used to cushion the pressure when releasing the pressure.

In other embodiments, the position and quantity of the support portion 42 are not limited, and are only used to separate the bottom surface of the battery cell 111 from the lower case 22 .

2 and 6, the battery module 11 also includes a battery tray 6, the battery tray 6 is rectangular, and the battery tray 6 is provided with a plurality of slots 61 in the same direction as the interval cooling plate 33, A plurality of cylindrical slots 62 are arranged in the center of the battery tray 6, and a large cylindrical battery cell 111 is arranged in each of the cylindrical slots 62. The cylindrical slots 62 are divided into multiple rows by a plurality of slots 61, in order to Improve the cooling effect while increasing the number of battery cells 111, and place every two adjacent interval cooling plates 33 symmetrically so that It can accommodate one battery cell 111, and each row of battery cells 111 can be misplaced through the symmetrically arranged spaced cooling plates 33 to achieve a staggered arrangement between rows, maximize the use of space, and increase the number of battery cells 111 accommodated.

In other embodiments, the battery tray 6 is filled with thermally conductive glue, or at the same time, the thermally conductive glue is poured into the cylindrical groove 62, and the interval cooling plate 33 inside the battery tray 6 is fixed to the slot 61 by pouring the thermally conductive glue. The battery core 111 is fixed to the cylindrical groove 62 to improve the overall heat conduction effect and self-strength.

In other embodiments, the poles of the same polarity of the battery cell 111 are all on the same side. For example, the positive poles of the battery cell 111 are all arranged on the top, and a copper bar is connected to the positive pole, and the top liquid cooling plate 32 is arranged above the copper bar. , used to cool the copper bars connected at the top of the system, so that the copper bars can pass a greater current and meet the needs of ultra-high fast charging at a lower cost. It is worth mentioning that the installation of the battery cell 111 does not need to limit the poles of the same polarity to be on the same side, and the top liquid cooling plate does not need to be in contact with the copper bar.

7-9, the two ends of the spaced cooling plate 33 are provided with connecting parts 331, and the connecting part 331 is provided with a liquid flow hole 332 for communicating with the tubular liquid cooling section 311, and the tubular liquid is connected through the connecting part 331. The cold section 311 can be used to communicate with the cooling liquid, and the spaced cooling plate 33 and the connecting part 331 are hollow inside, so as to circulate the cooling liquid from the liquid flow hole 332, and the cooling liquid in the tubular liquid cooling section 311 can be passed into Space the inside of the cooling plate 33 to cool down the temperature of both sides of the battery cell 111 . The closer the connection part 331 is to the liquid hole 332 , the smaller the internal space is for collecting the cooling liquid, so that the cooling liquid can circulate and cool down efficiently, effectively improving the speed of energy replenishment and user experience.

It should be noted that only one side of the connecting portion 331 of the spacer cooling plate 33 located at the two ends of the battery module 11 is provided with a liquid flow hole 332 to avoid liquid leakage.

In this embodiment 1, the connecting portion 331 at both ends of the spaced cooling plate 33 is plate-shaped, and the thickness of the connecting portion 331 is greater than the thickness of the spaced cooling plate 33, and the surface of the connecting portion 331 is kept horizontal. The two sides of the connection part 331 gradually shrink and transition to the position close to the liquid flow hole 332. The two sides of the connection part 331 and the liquid hole 332 are provided with quick connection pipes 333, and the quick connection pipes 333 are connected with the tubular liquid cooling section 311. The invention is not specifically limited, including but not limited to welding, screwing, clamping or glue bonding.

When the present invention is installed, the battery module is inserted into a plurality of spaced cooling plates 33, and then the two connecting parts 331 are connected to the quick connection pipes 333 through the tubular liquid cooling section 311 to realize the arrangement of the liquid cooling tubes 31 on both sides of the battery module, and then Connect the liquid cooling pipes 31 on both sides of multiple battery modules to the liquid cooling main pipe 34 through the tee joint 35 to realize the circulation of cooling liquid, and finally pour heat-conducting structural glue into each battery module or use heat-conducting double-sided Glue for fixing, and finally the liquid cold plate 32 is fixed to the top surface of multiple battery modules with thermally conductive structural glue, so as to realize the integrated design of the power battery module 1, and the system case 2 can also be added for packaging and fixing, further Improve the overall strength of the battery system.

In summary, the three-sided liquid-cooled large cylindrical battery system provided by the present invention has the following technical effects:

1. By designing a three-sided liquid-cooled structure, it can achieve ultra-high rate and fast charging, effectively improving the speed of energy replenishment and user experience;

2. The overall integrated structural design of the system effectively improves volume utilization efficiency and quality utilization efficiency, realizes high specific energy in a small space, and effectively improves battery life;

3. Through the design of an independent pressure relief space 5, the gas can be quickly relieved, and realize the rapid response and rapid warning of thermal runaway;

4. By designing the interval cooling plate 33, the heat accumulation between each row of battery cells 111 can be effectively avoided, and the difficulty of heat dissipation can be reduced;

4. Through three-sided liquid cooling, the internal temperature of the battery system can be reduced, thereby increasing the passing current, which can meet the needs of ultra-high fast charging at a lower cost.

The technical means disclosed in the solutions of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the present invention, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims (11)

1. A three-sided liquid-cooled large cylindrical battery system, characterized in that: comprising: A power battery module (1), the power battery module (1) includes at least one battery module (11), and multiple rows of battery cells (111) are evenly distributed in the battery module (11); A liquid cooling system (3), the liquid cooling system (3) comprising liquid cooling tubes (31) located on both sides of the power battery module (1) and a liquid cooling plate (32) located on the top of the power battery module (1) ; Wherein, a plurality of linearly arranged interval cooling plates (33) are clamped between the liquid cooling tubes (31) on both sides of the power battery module (1), and there are distributed on both sides of each row of cells (111). A spaced cooling plate (33), the spaced cooling plate (33) is connected to the electric core (111) through heat-conducting glue, and the liquid cooling plate (32) is connected to the electric core (111) through heat-conducting glue. 2. A three-sided liquid-cooled large cylindrical battery system according to claim 1, characterized in that: the liquid-cooled tubes (31) on both sides of the power battery module (1) are composed of multiple tubular liquid-cooled sections (311) are spliced together, every two tubular liquid cooling sections (311) are connected to a spacer cooling plate (33), and two tubular liquid cooling sections (311) at the same position on both sides are jointly clamped with a spacer cooling plate (33), so that there is an interval cooling plate (33) on both sides of each row of cells (111) in the power battery module (1), and the interval cooling plate (33) combined with the liquid The cold plate (32) realizes the cooling of the three sides of the electric core (111). 3. A three-sided liquid-cooled large cylindrical battery system according to claim 1, characterized in that: it also includes a system housing (2), the system housing (2) is used to accommodate and fix the power battery Module (1) and liquid cooling system (3). 4. A three-sided liquid-cooled large cylindrical battery system according to claim 3, characterized in that: the system casing (2) includes an upper casing (21) and a lower casing (22), and the upper casing (2) The housing (21) is detachably connected to the lower housing (22). 5. A three-sided liquid-cooled large cylindrical battery system according to claim 4, characterized in that: a support structure (4) is provided between the lower case (22) and the power battery module (1), The supporting structure (4) separates the bottom surface of the electric core (111) from the lower casing (22), so as to form an independent pressure relief space (5). 6. A three-sided liquid-cooled large cylindrical battery system according to claim 5, characterized in that: the supporting structure (4) includes a supporting plate (41) and at least two supporting parts (42), and the supporting structure (4) The board (41) is erected by the supporting part (42), and several pressure relief ports (411) are arranged on the supporting board (41). 7. A three-sided liquid-cooled large cylindrical battery system according to claim 1, characterized in that: the battery module (11) further includes a battery tray (6), and the battery tray (6) is provided with multiple A slot (61) consistent with the direction of the interval cooling plate (33), a plurality of cylindrical slots (62) are arranged in the center of the battery tray (6), and the cylindrical slots (62) pass through a plurality of slots (61 ) is divided into a multi-row structure, and the rows are staggered. 8. A three-sided liquid-cooled large cylindrical battery system according to claim 7, characterized in that: the battery tray (6) is filled with heat-conducting glue, so that the insulation and cooling in the battery tray (6) The board (33) is fixedly connected with the slot (61), and the columnar slot (62) is fixedly connected with the electric core (111). 9. A three-sided liquid-cooled large cylindrical battery system according to claim 7, characterized in that: the two ends of the spaced cooling plate (33) are provided with connecting parts (331), and the connecting parts (331) are set There are liquid flow holes (332) for communicating with the tubular liquid cooling section (311). 10. A three-sided liquid-cooled large cylindrical battery system according to claim 9, characterized in that: the spaced cooling plate (33) and the connecting part (331) are hollow inside, so as to pass through the liquid flow hole (332) Circulating coolant. 11. A three-sided liquid-cooled large cylindrical battery system according to claim 9, characterized in that: the closer the connecting part (331) is to the liquid hole (332), the smaller the internal space is for converging cooling liquid.