Built-in core rod structure of battery cell

Abstract

The utility model relates to the technical field of cell structures, in particular to a cell built-in core rod structure which comprises a core rod, the core rod comprises a core rod body, a plurality of liquid passing channels are arranged in the core rod body, and the cell built-in core rod structure further comprises two variable opening connecting pieces, the first connecting port and the second connecting port are oppositely arranged on the two sides of the variable port connecting piece body and communicate with each other through the variable port connecting piece body, and the variable port connecting piece communicates with the liquid passing channel after being connected with the core rod body through the second connecting port; the first connector is used for injecting cooling liquid into or discharging the cooling liquid out of the liquid passing channel. According to the utility model, the two ends of the core rod are provided with the variable port connecting pieces which are simple in structure, scientific in design and lower in cost, so that liquid injection and liquid discharge operations are facilitated, the space of the cover plate is released, the design difficulty and the processing cost of components such as the pole are reduced, and the assembly efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery cell structure technology, and in particular to a battery cell built-in core rod structure. Background Technology

[0002] Thermal management has always been a research focus in the field of new energy. Liquid cooling is a relatively common traditional cooling method, which achieves thermal management of the battery by setting a liquid cooling pipe or liquid cooling plate that is in contact with and connected to the battery and is circulated with coolant on one side of the battery.

[0003] To improve liquid cooling and fundamentally manage battery thermal performance, the applicant previously proposed a rapid temperature-controlled lithium-ion battery. This battery features a coolant containment chamber around the cell in its casing for external cooling. The core rod has fluid channels for internal cooling. This combination of external and internal cooling effectively improves the cell's heat dissipation, resulting in more uniform internal and external temperatures. This helps address the high internal temperature issue during high-rate charging and discharging, extending the cell's cycle life. Due to the numerous fluid channels on the core rod, a coolant manifold assembly is included to facilitate the flow of coolant into and out of all channels, thus cooling the cell's interior. However, the coolant manifold assembly has a complex structure, occupying space in the cover plate and increasing manufacturing costs. Furthermore, its structural limitations affect assembly efficiency. Therefore, there is an urgent need to provide a low-cost, quick-to-install, efficient, and reliable alternative structure to simplify the structure and reduce costs while fully utilizing the mandrel cooling function.

[0004] Therefore, this application is submitted. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a battery cell built-in core rod structure.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] A battery cell built-in core rod structure includes a core rod, which includes a core rod body. The core rod body has a plurality of liquid passages and two variable port connectors. Each variable port connector includes a variable port connector body and a first connection port and a second connection port that are disposed opposite to each other on both sides of the variable port connector body and communicate with each other through the variable port connector body. The variable port connector is connected to the core rod body through the second connection port and communicates with the liquid passages. The first connection port is used to inject or discharge coolant into or out of the liquid passages.

[0008] Preferably, the mandrel body has a buffer cavity formed by the recessed end faces of both ends of the liquid passage.

[0009] Preferably, the ratio of the cross-sectional area of ​​the first connection port to the total cross-sectional area of ​​the plurality of liquid passages is 0.9-1.1.

[0010] Preferably, the ratio of the cross-sectional area of ​​the first connection port to the total cross-sectional area of ​​the plurality of liquid passages is 1.

[0011] Preferably, the first connection port is a cylindrical connection nozzle located in the middle of one side of the variable connection body.

[0012] Preferably, at least one sealing ring groove is provided around the outer periphery of the first connection port.

[0013] Preferably, the side of the variable-port connector body that connects to the first connector is a curved surface, and the height H of the curved surface is 3-10mm.

[0014] Preferably, the height H of the curved surface is 4-5 mm.

[0015] Preferably, the second connection port matches the two ends of the mandrel body that have liquid passages, and the variable port connector body is seamlessly inserted, fastened, or welded to the two ends through the second connection port.

[0016] Preferably, the adapter body, the first connector, and the second connector are an integrated structure.

[0017] Compared with the prior art, this utility model has a simple structure, scientific design and low cost of variable port connectors at both ends of the mandrel. The setting not only facilitates the liquid injection and drainage operation, but also frees up the cover plate space, reduces the design difficulty and processing cost of components such as the pole, and improves the assembly efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0020] Figure 2 for Figure 1 Exploded view;

[0021] Figure 3 for Figure 1 and Figure 2 Schematic diagram of the structure of the core rod body;

[0022] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0023] Figure 5 for Figure 1 and Figure 2 3D structural diagram of the intermediate transformer port connector Figure 1 ;

[0024] Figure 6 for Figure 5 Top view;

[0025] Figure 7 for Figure 6 A cross-sectional view along the PP direction;

[0026] Figure 8 for Figure 1 and Figure 2 3D structural diagram of the intermediate transformer port connector Figure 2 ;

[0027] Figure 9 for Figure 8 A magnified structural diagram at point B in the middle.

[0028] In the diagram: 11, mandrel; 111, mandrel body; 112, liquid passage; 113, buffer chamber; 12, adapter connector; 121, adapter connector body; 122, first connection port; 1221, sealing ring groove; 123, second connection port. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] The structures not described in detail in the following embodiments are all prior art, and the various directional terms used to clearly describe the component structures are only used to describe their relative positional relationships and are not intended to limit the scope of protection of this utility model.

[0031] like Figures 1-9As shown in the figure: a battery cell built-in core rod structure includes a core rod 11, the core rod 11 includes a core rod body 111, the core rod body 111 is provided with a plurality of liquid passages 112, and also includes two variable port connectors 12, the variable port connector 12 includes a variable port connector body 121 and a first connection port 122 and a second connection port 123 which are disposed opposite to each other on both sides of the variable port connector body 121 and communicate with the variable port connector body 121. The variable port connector 12 is connected to the core rod body 111 through the second connection port 123 and communicates with the liquid passages 112. The first connection port 122 is used to inject or discharge coolant into or out of the liquid passages 112.

[0032] Working principle: The first connection port 122 and the second connection port 123 are connected by a transition connector body 121. The first connection port 122 is used to inject or discharge coolant into or out of the liquid channel 112, and the second connection port 123 is used to connect to the core rod body 111. The two transition connectors 121 are respectively sealed to the opposite ends of the core rod body 111 through their respective second connection ports 123. This built-in core rod structure is embedded in the battery cell during use. Coolant is injected into the core rod body 111 through the first connection port 122 at one end, flows through the liquid channel 112, and then exits from the first connection port 122 at the other end. During this process, the coolant carries away the heat dissipated by the battery cell during normal operation, thereby cooling the battery cell.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] 1. The design of the variable connector 12 can realize the injection of coolant into the liquid channel 112 quickly, efficiently and stably, without occupying too much cover plate space, so it will not have a significant adverse effect on the energy density of the battery cell.

[0035] 2. The adapter connector 12 has a simple structure and is easy to assemble. It is not only easy to process and has low manufacturing cost, but also helps to reduce the design difficulty, manufacturing cost and assembly difficulty of other components such as the terminal post, which helps to reduce the production cost and improve the production efficiency of the entire battery system.

[0036] 3. The combined design of the core rod 11 and the two adapter connectors 12 not only has a stable structure, high strength, good reliability and durability, but also provides structural support for the battery cell, increases the structural strength of the battery cell, so as to resist external impact and vibration, and ensure the efficient, safe and long-term operation of the cooling system.

[0037] It should be noted that the core rod 11 is generally made of metal, such as aluminum, copper or other high thermal conductivity materials; the adapter connector 12 is preferably made of the same material as the core rod 11, but can also be a composite material, such as metal-coated plastic.

[0038] As a preferred technical solution, in another embodiment of the present invention, the mandrel body 111 is provided with a buffer cavity 113 formed by the recessed end face portion of the liquid passage 112.

[0039] In this embodiment, in practice, the two end faces of the mandrel body 111 are first recessed (for example, only the outer periphery of the end face is retained, and the other parts of the end face are recessed) to form two buffer cavities 113. Then, a through hole is opened between the two recessed end faces along the length direction of the mandrel body 111 to form a liquid passage 112.

[0040] In this embodiment, the buffer chamber 113 has at least the following beneficial effects: (1) it sufficiently decelerates and stabilizes the coolant before it enters the liquid passage 112, thereby ensuring its smooth flow within the liquid passage 112 and improving heat dissipation efficiency; (2) it acts as a pressure balance zone and flow regulation zone, which helps to distribute the pressure and flow of the coolant within the liquid passage 112, further improving heat dissipation efficiency; (3) it protects the core rod body 111, preventing the high-speed flowing coolant from scouring and abrading its inlet, thus affecting its service life. The buffer chamber 113 helps to improve the overall performance and reliability of the battery liquid cooling system.

[0041] In this embodiment, the specific structure of the buffer chamber 113 is not limited. Any structure that can improve the stability of coolant flow, optimize the efficiency of the liquid cooling system, protect the liquid cooling plate structure, and adapt to different coolant flow requirements can be used as a buffer chamber.

[0042] As a preferred technical solution, in another embodiment of this utility model, the ratio of the cross-sectional area of ​​the first connection port 122 to the total cross-sectional area of ​​the plurality of liquid passages 112 is 0.9-1.1.

[0043] As a preferred technical solution, in another embodiment of this utility model, the ratio of the cross-sectional area of ​​the first connection port 122 to the total cross-sectional area of ​​the plurality of liquid passages 112 is 1.

[0044] The first connection port 122 is mainly used to inject or discharge coolant into or out of the liquid passage 112. Therefore, the cross-sectional area of ​​the first connection port 122 must match the total cross-sectional area of ​​the liquid passages 112. If the cross-sectional area of ​​the first connection port 122 is too small, the coolant flow will be limited, affecting the cooling efficiency and cooling effect. If the cross-sectional area of ​​the first connection port 122 is too large, although it can increase the coolant flow, it will bring unstable flow, resulting in uneven distribution of coolant in the liquid passage 112, which is also detrimental to the cooling efficiency and cooling effect.

[0045] This invention, through creative effort, discovers that when the ratio of the cross-sectional area of ​​the first connection port 122 to the total cross-sectional area of ​​the plurality of liquid passages 112 is 0.9-1.1, the coolant can flow uniformly and efficiently through the liquid passages 112, while also balancing flow rate and velocity, resulting in better cooling effect, cooling efficiency, and system performance. In particular, when the ratio of the cross-sectional area of ​​the first connection port 122 to the total cross-sectional area of ​​the plurality of liquid passages 112 is 1, the cooling effect is optimal and the cooling efficiency is highest.

[0046] As a preferred technical solution, in another embodiment of this utility model, the first connection port 122 is a cylindrical connection nozzle located in the middle of one side of the variable-port connector body 121. The first connection port 122 is designed as a cylindrical structure, mainly based on the following considerations: (1) The smooth streamlined design of the cylindrical structure helps to reduce the resistance of the coolant during the flow process, improve the flow efficiency of the coolant, and also facilitates the control of the flow rate and pressure of the coolant, ensuring that the coolant can enter the liquid passage 112 evenly and stably; (2) The sealing technology of the cylindrical structure is mature, which helps to improve the sealing effect and effectively prevent coolant leakage; (3) The cylindrical structure is easy to standardize and generalize, and the processing technology is mature, with low production difficulty, high production efficiency and relatively stable quality.

[0047] As a preferred technical solution, in another embodiment of this utility model, at least one sealing ring groove 1221 is provided around the outer periphery of the first connection port 122. In specific applications, a sealing ring can be provided at the sealing ring groove 1221 to improve the connection stability of this utility model when installed with other structures and to prevent it from shifting or shaking.

[0048] As a preferred technical solution, in another embodiment of this utility model, the side of the variable-port connector body 121 that connects to the first connecting port 122 is a curved surface, such as... Figure 7 As shown: The height H of the curved surface is 3-10mm, for example, it can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0049] In this embodiment, a curved transition is adopted between the first connection port 122 and the second connection port 123. The curved transition has multiple advantages: (1) It can reduce the flow resistance of the coolant, making the flow of the coolant between the first connection port 122 and the second connection port 123 smoother. The low coolant resistance can reduce the energy consumption of the cooling system and improve the flow efficiency of the coolant; (2) It can avoid stress concentration. The curved transition design can disperse the stress generated by the coolant during the flow process, avoiding stress concentration, which helps to extend the service life of the mandrel body 111 and reduce damage caused by stress concentration; (3) It improves the sealing performance. The curved transition design can increase the sealing performance between the first connection port 122 and the mandrel body 111. (3) Improve the contact area between the two, thereby improving the sealing performance, helping to prevent coolant leakage and ensuring the stable operation of the cooling system; (4) Optimize the distribution of coolant. The curved transition design can optimize the coolant distribution between the first connection port 122 and the second connection port 123, thereby making the coolant distribution in the liquid passage 112 more uniform, reducing the eddy currents and dead zones in the liquid passage 112, further improving the cooling efficiency and improving the cooling effect; (5) Enhance the structural strength. The curved transition design can increase the connection strength between the first connection port 122 and the core rod body 111, improve the structural strength of the entire core rod structure, help resist external impacts and vibrations, and ensure the reliability and durability of the entire cooling system.

[0050] In this embodiment, in order to fully utilize the above-mentioned functions of the curved surface, while avoiding it from occupying too much battery space and thus affecting the energy density of the battery, the height H of the curved surface is preferably 3-10mm.

[0051] As a preferred technical solution, in another embodiment of this utility model, the height H of the curved surface is 4-5mm, for example, it can be 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, or 5mm.

[0052] In this embodiment, the inventors discovered through creative effort that, in order to reduce fluid resistance, avoid stress concentration, improve sealing performance, optimize fluid distribution, and enhance the structural strength of the core rod 11, the height of the curve should be at least 4-5 mm. Within this height range, the energy density of the battery cell is minimally affected, the cooling system performs well, and the safe and efficient operation of the battery cell can be ensured.

[0053] As a preferred technical solution, in another embodiment of this utility model, the second connection port 123 is matched with the two ends of the liquid passage 112 provided on the core rod body 111. For example, the cross-section of the core rod body 111 is a racetrack-shaped structure, the second connection port 123 is hollow and its cross-section is also a racetrack-shaped structure, and the two variable-port connector bodies 121 are seamlessly inserted, snapped, or welded to the two ends of the core rod body 111 through the two second connection ports 123.

[0054] In this embodiment, if welding is selected, laser welding is preferred for connection and sealing. Laser welding can ensure high precision, high quality, high efficiency, high stability, high sealing and high safety, and is also environmentally friendly and energy-saving, without producing any harmful substances.

[0055] In this embodiment, the adapter 12 is made of a composite material, such as metal-clad plastic, with the plastic part protruding to achieve insertion and the metal part used for welding.

[0056] As a preferred technical solution, in another embodiment of this utility model, the variable port connector body 121, the first connection port 122, and the second connection port 123 are an integrated structure obtained by casting. The integrated structural design makes the variable port connector 2 have good structural strength, sealing performance, and stability, ensuring that the entire mandrel structure has high strength, good sealing performance, good stability, long service life, and is not prone to leakage.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions, and variations to the above embodiments within the scope of the present invention. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

Claims

1. A battery cell built-in core rod structure, comprising a core rod (11), the core rod (11) comprising a core rod body (111), the core rod body (111) having a plurality of liquid-passing channels (112) disposed therein, characterized in that, It also includes two variable-port connectors (12). Each variable-port connector (12) includes a variable-port connector body (121) and a first connection port (122) and a second connection port (123) which are disposed opposite to each other on both sides of the variable-port connector body (121) and communicate with each other through the variable-port connector body (121). The variable-port connector (12) is connected to the mandrel body (111) through the second connection port (123) and then communicates with the liquid passage (112). The first connection port (122) is used to inject or discharge coolant into or out of the liquid passage (112).

2. The battery cell built-in core rod structure according to claim 1, characterized in that, The mandrel body (111) is provided with a liquid passage (112) and the end faces of both ends are recessed to form a buffer cavity (113).

3. The battery cell built-in core rod structure according to claim 1, characterized in that, The ratio of the cross-sectional area of ​​the first connection port (122) to the total cross-sectional area of ​​the several liquid passages (112) is 0.9-1.

1.

4. The battery cell built-in core rod structure according to claim 3, characterized in that, The ratio of the cross-sectional area of ​​the first connection port (122) to the total cross-sectional area of ​​the several liquid passages (112) is 1.

5. The battery cell built-in core rod structure according to claim 1, characterized in that, The first connection port (122) is a cylindrical connection nozzle and is located in the middle of one side of the variable connection body (121).

6. The battery cell built-in core rod structure according to claim 1, characterized in that, At least one sealing ring groove (1221) is provided around the outer periphery of the first connection port (122).

7. The battery cell built-in core rod structure according to claim 1, characterized in that, The side of the variable connector body (121) connected to the first connector (122) is a curved surface, and the height H of the curved surface is 3-10mm.

8. The cell-embedded core rod structure according to claim 7, characterized in that, The height H of the curved surface is 4-5mm.

9. The battery cell built-in core rod structure according to claim 1, characterized in that, The second connection port (123) matches the two ends of the mandrel body (111) which are provided with liquid passages (112). The variable port connector body (121) is seamlessly inserted, fastened or welded to the two ends through the second connection port (123).

10. The cell-embedded core rod structure according to any one of claims 1-9, characterized in that, The body of the adapter (121), the first connector (122), and the second connector (123) are an integrated structure.

Images