Battery cell with built-in cooling core rod and battery
By optimizing the built-in cooling core design and the variable connector, the problems of high processing difficulty and cost in battery thermal management using liquid cooling methods have been solved, achieving efficient battery thermal management and low-cost production, and improving the battery's heat dissipation performance and production efficiency.
Patent Information
- Application Number
- CN202520069468.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Existing liquid cooling methods for battery thermal management suffer from problems such as high difficulty in casing processing, high cost, large space occupation, difficulty in achieving sealing, inconvenient installation, and poor temperature control. Furthermore, the internal cooling core rod has high requirements for matching with the casing, which makes processing difficult, resulting in high battery production costs and low efficiency.
It adopts a built-in cooling core design, including a core assembly and a variable-port connector. The core assembly has a liquid passage, and the variable-port connector matches the liquid inlet and outlet through an integrated structure. The coolant flows stably through the variable-port connector. Combined with a buffer chamber design, it optimizes the flow and pressure distribution to ensure cooling efficiency and structural strength.
It improves the battery's heat dissipation performance, reduces the design and processing costs of battery components, increases production efficiency, simplifies the assembly process, reduces the battery's manufacturing cost, and enhances the battery's thermal management performance and practicality.
Smart Images
Figure CN223828535U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of electric core structure, especially an electric core and battery with built-in cooling core rod. BACKGROUND
[0002] Thermal management has been the focus of new energy field, and liquid cooling is a common traditional cooling method. Most of the existing liquid cooling methods are to realize the thermal management of the battery by contacting the liquid cooling plate or liquid cooling pipe with cooling liquid through a certain plane or curved surface of the battery. For example, the liquid cooling plate is integrated on the shell, and the liquid cooling plate is located between the adjacent two electric cores after the multiple electric cores are arranged in the shell, and the heat of the electric core is taken away by the liquid cooling plate. This method has the following disadvantages: (1) the shell is difficult to process, the cost is high, and the yield is low; (2) the liquid cooling plate occupies limited battery space, affects the energy density of the battery, and the liquid cooling interface is difficult to seal; (3) the installation is not convenient, which further increases the manufacturing cost; (4) the liquid cooling plate acts on the side surface of the electric core, and cannot directly act on the inside of the electric core, so the temperature control effect is poor. Some batteries also use built-in cooling core rods to realize thermal management, such as some cylindrical batteries, which have hollow core rods inside, and the electrodes and separators are wound outside the core rods, and the cooling liquid can flow through the core rods to cool the inside of the battery. This cooling method has high cooling efficiency and good cooling effect. However, it is currently mainly used in cylindrical batteries, and the cooperation of such core rods with the shell or cover plate has high tolerance requirements, and the integral processing of the parts is difficult.
[0003] The applicant has proposed a fast temperature control type lithium ion battery, which has a square structure, a flat core rod is arranged inside the electric core, a plurality of liquid passing channels are arranged on the core rod, and the cooling liquid flows through the liquid passing channels to cool the inside of the electric core. Due to the large number of liquid passing channels on the core rod, in order to facilitate the input and output of cooling liquid into each channel, a cooling liquid collecting assembly is arranged in the technical scheme, which helps the cooling liquid to smoothly enter all the liquid passing channels and leave. However, due to the relatively complex structure, the obtained electric core and battery not only have high manufacturing cost, but also are inconvenient to assemble and group, resulting in low production efficiency and high production cost.
[0004] Therefore, the present application is proposed. UTILITY MODEL CONTENTS
[0005] In view of the above-mentioned shortcomings of the prior art, the utility model provides an electric core and battery with built-in cooling core rod.
[0006] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the utility model comprises:
[0007] In one aspect, the utility model provides a kind of built-in cooling core rod's electric core, comprising: core rod assembly and the cross section is the track type of roll core, core rod assembly includes core rod, and the core rod includes core rod body, and the liquid passage of several is arranged in the core rod body so that the one end of core rod body becomes liquid inlet end, and one end becomes liquid outlet end, roll core is arranged outside core rod body, and core rod assembly further includes two mouthpiece connectors, mouthpiece connector includes mouthpiece connector body, first connecting port and second connecting port, and first connecting port and second connecting port are transitioned by mouthpiece connector body, and second connecting port is matched with the liquid inlet end and the liquid outlet end structure, and two mouthpiece connectors are connected with the liquid inlet end, the liquid outlet end after being connected by two second connecting ports, and two first connecting ports are communicated with the liquid passage.
[0008] Preferably, the two end face portions of the core rod body provided with the liquid passage are recessed to form a buffer cavity.
[0009] Further preferably, the ratio of the cross-sectional area of the first connecting port to the total cross-sectional area of the plurality of liquid passages is 0.9-1.1.
[0010] Further preferably, the first connecting port is a cylindrical connecting nozzle and is located at the middle of one side of the mouthpiece connector body.
[0011] Further preferably, at least one sealing ring clamping groove is arranged around the outer periphery of the first connecting port.
[0012] Further preferably, the mouthpiece connector body is a curved surface, and the height H of the curved surface is 3-10 mm.
[0013] Further preferably, the mouthpiece connector body, the first connecting port and the second connecting port are an integrated structure, the second connecting port is seamlessly inserted, buckled or welded with the liquid inlet end and the liquid outlet end, the thickness of the core rod body is 2-10 mm, and the thickness of the liquid passage is 1-9 mm.
[0014] Compared with the prior art, the built-in cooling core rod's electric core has good heat dissipation performance, and helps to reduce the design difficulty, processing cost and assembly difficulty of other components of the battery, thereby reducing the manufacturing cost of the battery and improving the production efficiency of the battery.
[0015] On the other hand, the utility model provides a kind of battery, comprising: positive current collector, positive pole assembly, positive cover plate assembly, negative current collector, negative pole assembly, negative cover plate assembly, shell and built-in cooling core rod's electric core.
[0016] Preferably, the outer shape of the positive electrode current collector matches the cross-sectional structure of the roll core, a special-shaped through hole for passing the variable-port connecting piece is arranged in the middle part of the positive electrode current collector, a plurality of second grooves in long strip shape, inclined arrangement and parallel to each other are distributed above and below the special-shaped through hole, a plurality of infiltration through holes are arranged between the adjacent two second grooves, and the first groove for connecting the positive electrode post assembly is arranged on one side of the special-shaped through hole.
[0017] Further preferably, the battery has a square shape and the edges and corners are transitioned by a circular arc, the battery has a length of 100-1000 mm, a height of 50-300 mm and a thickness of 10-200 mm, and the radius of the circular arc is 2-100 mm.
[0018] Compared with the prior art, the battery has good heat management performance, high production efficiency, low production cost, small assembly and grouping difficulty, helps to reduce the manufacturing cost of the battery module, improves the assembly efficiency, has strong practicability and high popularization value. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0020] Figure 1 The structure diagram of an embodiment of the core rod assembly in the battery cell with built-in cooling core rod provided by the present application is shown in the figure.
[0021] Figure 2 The exploded view of the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 1 The exploded view of the battery cell with built-in cooling core rod provided by the present application is shown in the figure.
[0022] Figure 3 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 1 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 2 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure.
[0023] The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 4 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 3 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure.
[0024] The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 5 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 1 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 2 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 1 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure.
[0025] The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 6 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 5 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure.
[0026] The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 7 The structure diagram of the core rod body in the battery cell with built-in cooling core rod provided by the present application is shown in the figure. Figure 6A sectional view in the P-P direction;
[0027] Figure 8 For Figure 1 And Figure 2 A perspective structural diagram of the variable-port connecting piece Figure 2 ;
[0028] Figure 9 For Figure 8 An enlarged structural diagram at B in the figure
[0029] Figure 10 A structural diagram of an embodiment of the battery
[0030] Figure 11 For Figure 10 An exploded view
[0031] Figure 12 For Figure 10 A structural diagram of one side of the positive current collector
[0032] Figure 13 For Figure 10 A structural diagram of the other side of the positive current collector
[0033] Figure 14 For Figure 10 A structural diagram of the negative cover plate assembly
[0034] Figure 15 For Figure 14 An exploded view
[0035] In the figure: 1, core rod assembly; 11, core rod; 111, core rod body; 112, liquid passage; 113, buffer cavity; 12, variable-port connecting piece; 121, variable-port connecting piece body; 122, first connecting port; 1221, sealing ring clamping groove; 123, second connecting port; 2, winding core; 3, positive current collector; 31, special-shaped through hole; 32, first groove; 33, second groove; 34, infiltration through hole; 4, positive pole column assembly; 5, positive cover plate assembly; 6, negative current collector; 7, negative pole column assembly; 8, negative cover plate assembly; 81, cover plate body; 82, sealing rubber ring; 83, insulating pad; 84, pole column sleeve; 85, injection plastic; 86, explosion-proof valve; 87, explosion-proof valve adhesive film; 88, sealing nail; 89, pole column through hole; 810, liquid cooling pipe through hole; 9, shell. DETAILED DESCRIPTION
[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.
[0037] The structures not described in detail in the following embodiments are prior art, and various orientation words used for clearly describing the structures of components only describe relative position relationships, and are not used for limiting the protection scope of the utility model.
[0038] As Figures 1-15 The utility model discloses a kind of battery core of built-in cooling mandrel, include: mandrel assembly 1 and cross section is the winding core 2 of runway type, mandrel assembly 1 includes mandrel 11, mandrel 11 includes mandrel body 111, mandrel body 111 is provided with several liquid passages 112 in it so that the one end of mandrel body 111 becomes liquid inlet end, one end becomes liquid outlet end, winding core 2 is around set in mandrel body 111 outside, mandrel assembly 1 also includes two variable mouth connectors 12, variable mouth connector 12 includes variable mouth connector body 121, first connecting port 122 and second connecting port 123, first connecting port 122 and second connecting port 123 are transitioned by variable mouth connector body 121, second connecting port 123 and the liquid inlet end and the liquid outlet end structure match, two variable mouth connectors 12 are connected with the liquid inlet end, the liquid outlet end respectively by two second connecting port 123, two first connecting ports 122 and liquid passage 112 are all communicated.
[0039] The utility model discloses a kind of battery core, wherein middle part is built-in mandrel 11, cooling liquid is injected into mandrel body 111 by the first connecting port 122 of one end, flows through liquid passage 112 and then is discharged from the first connecting port 122 of another end mandrel body 111, in this process, cooling liquid takes away the heat emitted when winding core 2 works and then realizes heat management.
[0040] In the embodiment, the design of variable mouth connector 12 can not only realize quickly, efficiently and stably injecting cooling liquid into liquid passage 112, but also can provide structural support, enhance the structural strength of battery core, so as to resist external impact and vibration, ensure the efficient, safe and long-term operation of cooling system.
[0041] In the embodiment, variable mouth connector 12 is scientific, compact and simple in structure, which helps to reduce the design difficulty, manufacturing cost and assembly difficulty of other battery components, reduce the production cost of battery and improve the production efficiency of battery.
[0042] In the embodiment, the core rod 11 is generally made of metal, such as aluminum, copper or other high-thermal-conductivity materials; the variable-port connecting piece 12 is preferably made of the same material as the core rod 11, or can be a composite material, such as a metal-plastic composite.
[0043] In the embodiment, the winding core 2 is wound on the core rod body 111 in a winding manner in the stacking structure of separator-negative electrode sheet-separator-positive electrode sheet-separator, and the positive electrode sheet tab and the negative electrode sheet tab are on different sides during winding; the cross section of the winding core 2 is in a runway type structure, and the connection between the liquid cooling pipes can be achieved in a quick plug manner when the battery cells are connected in series or in parallel, which can reduce the space occupation and improve the grouping efficiency and reduce the replacement difficulty.
[0044] As a preferred technical solution, in another embodiment of the utility model, the core rod body 111 is provided with two end face portions of the liquid passing channel 112, and the two end face portions are recessed to form buffer cavities 113.
[0045] In specific practice, the two end faces of the core rod body 111 are first recessed (for example, only the outer periphery of the end face is reserved, and the other part of the end face is recessed) to form two buffer cavities 113, and then the liquid passing channel 112 is arranged between the two recessed end faces and along the length direction of the core rod body 111. The buffer cavities 113 mainly serve as pressure balance zones and flow regulation zones, which are helpful to the pressure distribution and flow distribution of the cooling liquid in the liquid passing channel 112, and the cooling liquid can be fully decelerated and stabilized before entering the liquid passing channel 112, so as to ensure the smooth flow of the cooling liquid in the liquid passing channel 112 and improve the heat dissipation efficiency.
[0046] Of course, the specific structure of the buffer cavity 113 is not limited to the above introduction, and other design methods can also be adopted, such as additionally arranging independent structures at the two ends of the liquid passing channel 112 to construct the buffer cavities.
[0047] As a preferred technical solution, in another embodiment of the utility model, the ratio of the cross-sectional area of the first connecting port 122 to the total cross-sectional area of the plurality of liquid passing channels 112 is 0.9-1.1.
[0048] The first connecting port 122 is mainly used for injecting or discharging the cooling liquid into or out of the liquid passing channel 112, so the cross-sectional area of the first connecting port 122 and the total cross-sectional area of the plurality of liquid passing channels 112 should be matched. If the cross-sectional area of the first connecting port 122 is too small, the cooling liquid flow will be limited, which will affect the cooling efficiency and cooling effect; if the cross-sectional area of the first connecting port 122 is too large, although the cooling liquid flow can be increased, unstable flow will be caused, which will lead to uneven distribution of the cooling liquid in the liquid passing channel 112, which is also not conducive to the cooling efficiency and cooling effect.
[0049] The utility model discloses a pay creative labor finds: when the ratio of the cross-sectional area of first connecting mouth 122 and the total cross-sectional area of several liquid passing channels 112 is 0.9-1.1, cooling liquid can evenly, efficiently flow through liquid passage 112, and can give consideration to flow and flow velocity, obtain better cooling effect, cooling efficiency and system performance. Especially, when the ratio of the cross-sectional area of first connecting mouth 122 and the total cross-sectional area of several liquid passing channels 112 is 1, both are most matched, and cooling effect is best, cooling efficiency is highest.
[0050] As a preferred technical scheme, another embodiment of the utility model, first connecting mouth 122 is cylindrical connecting mouth and is located in the middle of one side of variable mouth connecting piece body 121.
[0051] First connecting mouth 122 is designed as cylindrical structure, on the one hand, the smooth streamline design of cylindrical structure helps to reduce the resistance of cooling liquid in the flowing process, improves the flowing efficiency of cooling liquid, also facilitates the control of the flow and pressure of cooling liquid, ensures that cooling liquid can evenly, stably enter liquid passing channel 112, on the other hand, the sealing technology of cylindrical structure is mature, helps to improve the sealing effect, effectively prevents cooling liquid leakage, furthermore, cylindrical structure is convenient for realizing standardization and generalization, and the processing technology is mature, and production difficulty is small, production efficiency is high and quality is relatively stable.
[0052] As a preferred technical scheme, still another embodiment of the utility model, at least one sealing ring clamping groove 1221 is arranged along the outer periphery of first connecting mouth 122, when assembling the battery other components such as the electric core and the cover plate assembly, the sealing ring clamping groove 1221 can be provided with sealing ring, to ensure the stability of connection.
[0053] As a preferred technical scheme, still another embodiment of the utility model, variable mouth connecting piece body 121 is a curved surface, and the curved surface is used between first connecting mouth 122 and second connecting mouth 123, and the curved surface has the following advantages: (1) can reduce the flowing resistance of cooling liquid, reduce the energy consumption of cooling system, improve the flowing efficiency of cooling liquid; (2) can avoid stress concentration, disperse the stress generated in the flowing process of cooling liquid, help to prolong the service life of core rod body 111, reduce the damage caused by stress concentration; (3) improve sealing performance, prevent cooling liquid leakage, ensure the stable operation of cooling system; (4) optimize the distribution of cooling liquid, make the distribution of cooling liquid in liquid passing channel 112 more uniform, reduce the vortex and dead zone of cooling liquid in liquid passing channel 112, further improve cooling efficiency, improve cooling effect; (5) enhance the structural strength of the whole core rod 11, improve the ability of resisting external impact and vibration, ensure the reliability and durability of the whole cooling system.
[0054] As Figure 7As shown, the height H of the curved surface is 3-10mm, and can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm. Within this height range, the curved surface can fully play the above functions, and can avoid occupying too much battery space and affecting the energy density of the battery. The height H of the curved surface is most preferably 4-5mm.
[0055] As a preferred technical solution, in another embodiment of the utility model, the variable-port connecting piece body 121, the first connecting port 122 and the second connecting port 123 are integrated structures, the second connecting port 123 is seamlessly inserted, buckled or welded with the liquid inlet end and the liquid outlet end, preferably laser welding; the thickness of the core rod body 111 is 2-10mm, and the thickness of the liquid passage 112 is 1-9mm.
[0056] The integrated structure design makes the variable-port connecting piece 12 have good structural strength, sealing performance and stability, ensures that the entire core rod has high structural strength, good sealing performance and excellent stability, has a long service life and is not prone to liquid leakage.
[0057] The thickness of the core rod body 111 is controlled to be 2-10mm, which facilitates the arrangement of the liquid passage 112 therein and can provide better structural support for the battery cell, ensuring the structural strength of the entire battery cell. On this basis, the thickness of the liquid passage 112 is designed to be 1-9mm, so as to play a better heat dissipation effect without significantly affecting the strength of the core rod body 111. Figure 3 As shown: the liquid passage 112 is generally provided along the length direction of the core rod body 111, and has a long hole shape in cross section (only as an example, other structures are also possible), which facilitates the cooling liquid to have more contact area with the core rod body 111, thereby having better heat dissipation effect. The various liquid passages 112 can have consistent or inconsistent structure sizes. Since the temperature in the middle of the battery cell is higher during normal operation, and the temperature on both sides is lower, the size of the liquid passage 112 located at the center of the core rod body 111 can be designed to be larger, and the sizes of the liquid passages 112 located on the opposite sides of the core rod body 111 can be designed to be smaller.
[0058] The utility model also provides a battery, which comprises: a positive electrode current collector 3, a positive electrode post assembly 4, a positive electrode cover plate assembly 5, a negative electrode current collector 6, a negative electrode post assembly 7, a negative electrode cover plate assembly 8, a shell 9 and the above-mentioned battery cell.
[0059] The outer shape of the positive electrode current collector 3 matches the cross-sectional structure of the roll core 2, also in a runway type, and is made of aluminum. The middle part of the positive electrode current collector 3 is provided with a special-shaped through hole 31. The structure and size of the special-shaped through hole 31 are matched with the structure and size of the variable port connecting piece 12. A plurality of long strip-shaped second grooves 33 for penetrating welding with the foil of the roll core 2 are distributed above and below the special-shaped through hole 31. Each long strip-shaped second groove 33 above and below is inclined and parallel to each other. All the second grooves 33 can be inclined in the same direction, or the second grooves 33 above can be inclined in one direction, and the second grooves 33 below can be inclined in another direction. A plurality of infiltration through holes 34 for the flow of electrolyte into the roll core 2 are arranged between the adjacent two second grooves 33. Specifically, the infiltration through hole 34 can be a transversely distributed long hole structure. A first groove 32 is arranged on one side of the special-shaped through hole 31. The structure of the first groove 32 matches the positive electrode post, so as to be welded with the positive electrode post. The negative electrode current collector 6 has a structure similar to that of the positive electrode current collector 3 and is made of copper.
[0060] The positive electrode post assembly 4 and the negative electrode post assembly 7 both adopt the prior art, and the specific structure is not limited.
[0061] The negative cover plate assembly 8 is provided with a post through hole 89, a liquid cooling pipe through hole 810, a liquid injection hole, and an anti-explosion valve mounting hole, and the like. The negative cover plate assembly 8 comprises a cover plate body 81, a sealing rubber ring 82, an insulating pad 83, a post sleeve 84, and an injection molded plastic 85. The post sleeve 84 is connected with the cover plate body 81 through the injection molded plastic 85 and is sealed through the compression deformation of the sealing rubber ring 82. The insulating pad 83 is arranged on the bottom surface of the cover plate body 81. The liquid injection hole is provided with a sealing nail 88. The anti-explosion valve 86 is mounted in the anti-explosion valve mounting hole and is covered with an anti-explosion valve film 87 on the surface. The positive cover plate assembly 5 is similar in structure to the negative cover plate assembly 8, except that it is not provided with a liquid injection hole and an anti-explosion valve mounting hole.
[0062] It should be noted that the material of the sealing rubber ring 82 is preferably a ternary ethylene-propylene rubber or a fluorine rubber. The material of the insulating pad 83 is preferably PP. The material of the injection molded plastic 85 is preferably PPS. The material of the positive electrode post sleeve is preferably aluminum. The material of the negative electrode post sleeve is preferably a copper-aluminum composite material.
[0063] The shell 9 is an integrated structure formed by extrusion. The structure and size of the shell 9 match the structure and size of the battery cell. Both ends are open for mounting the corresponding cover plate assembly and the like. The wall thickness is preferably 0.3-1 mm.
[0064] During assembly, the positive current collector 3 and the negative current collector 6 are respectively laser penetration welded with the winding core 2, the positive pole post assembly 4 is laser welded in the first groove 32 of the positive current collector 3 and passes through the pole post through hole of the positive cover plate assembly 5 and is laser welded with the positive pole post sleeve; the negative pole post assembly 7 is laser welded on the negative current collector 6 and passes through the pole post through hole 89 of the negative cover plate assembly 8 and is laser welded with the negative pole post sleeve; the variable mouth connecting piece 12 adjacent to the negative cover plate assembly 8 is laser welded with the cover plate body 81 after passing through the liquid cooling pipe through hole 810 to realize the fixed connection of the core rod 11 and the negative cover plate assembly 8, so as to isolate the inside and outside of the core rod 11, the cover plate body 81 is laser welded with the aluminum shell 9; the variable mouth connecting piece 12 on the other side is connected in the same way, and finally the whole sealing is realized. Overall, the battery has high production efficiency, low production cost, small assembly and grouping difficulty.
[0065] As a preferred technical solution, in another embodiment of the utility model, the battery shape is square and the corners are transitioned with circular arcs, the battery is 100-1000mm long, 50-300mm high and 10-200mm thick, and the radius of the circular arc is 2-100mm.
[0066] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and deform the above-mentioned embodiments within the scope of the utility model. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without mutual contradiction.
Claims
1. A battery cell with a built-in cooling core, comprising: The mandrel assembly (1) and the rolled core (2) with a racetrack-shaped cross-section are provided. The mandrel assembly (1) includes a mandrel (11), and the mandrel (11) includes a mandrel body (111). The mandrel body (111) is provided with a plurality of liquid passages (112) so that one end of the mandrel body (111) is a liquid inlet and the other end is a liquid outlet. The rolled core (2) is wound around the mandrel body (111). The mandrel assembly (1) is characterized in that it further includes two variable-mouth connectors (12). The variable-mouth connectors (12) include variable-mouth connectors. The connector body (121), the first connection port (122), and the second connection port (123) are connected by a variable-port connector body (121). The second connection port (123) is structurally matched with the liquid inlet and the liquid outlet. After the two variable-port connectors (12) are connected to the liquid inlet and the liquid outlet respectively through the two second connection ports (123), the two first connection ports (122) are connected to the liquid passage (112).
2. The battery cell with a built-in cooling core rod 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 with a built-in cooling core rod 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 with a built-in cooling core rod 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).
5. The battery cell with a built-in cooling core rod according to claim 1, characterized in that, At least one sealing ring groove (1221) is provided on the outer periphery of the first connection port (122).
6. The battery cell with a built-in cooling core rod according to claim 1, characterized in that, The body (121) of the variable connector is a curved surface, and the height H of the curved surface is 3-10mm.
7. The battery cell with a built-in cooling core as described in claim 1, characterized in that, The variable port connector body (121), the first connection port (122), and the second connection port (123) are an integrated structure. The second connection port (123) is seamlessly inserted, snapped, or welded to the liquid inlet and the liquid outlet. The thickness of the core rod body (111) is 2-10mm, and the thickness of the liquid passage (112) is 1-9mm.
8. A battery, characterized in that, include: Positive current collector (3), positive terminal assembly (4), positive cover plate assembly (5), negative current collector (6), negative terminal assembly (7), negative cover plate assembly (8), housing (9), and a battery cell with an internal cooling core as described in any one of claims 1-7.
9. The battery according to claim 8, characterized in that, The shape of the positive current collector (3) matches the cross-sectional structure of the core (2). A special-shaped through hole (31) for the variable connector (12) to pass through is opened in the middle of the positive current collector (3). Several long strip-shaped, inclined and parallel second grooves (33) are distributed above and below the special-shaped through hole (31). Several wetting through holes (34) are opened between two adjacent second grooves (33). A first groove (32) for connecting the positive electrode post assembly (4) is provided on one side of the special-shaped through hole (31).
10. The battery according to claim 8, characterized in that, The battery is square in shape with rounded corners. The battery is 100-1000mm long, 50-300mm high, and 10-200mm thick. The radius of the rounded corners is 2-100mm.