Cylindrical battery

Abstract

The utility model discloses a cylindrical battery, which comprises a roll core, a cylindrical battery core and a cylindrical battery core, and is characterized in that the roll core is wound to form a center hole; the center pipe is located in the center hole and provided with a peripheral wall, the center pipe comprises a through hole and a Tesla valve, the through hole penetrates through the peripheral wall, the Tesla valve is installed in the through hole, and the Tesla valve controls communication of the through hole; and the electrolyte in the central pipe can flow out to the roll core through the Tesla valve in a one-way manner. By adopting the technical scheme, the electrolyte injected into the central pipe along the central hole can flow out to the roll core in one direction through the Tesla valve, so that the interior of the roll core is fully infiltrated, the infiltration interface of the pole piece is good, meanwhile, the electrolyte in the roll core can be prevented from flowing into the central pipe through the through hole, and the effect of preserving the electrolyte of the roll core is achieved. Furthermore, the central tube can still provide support for the roll core and the central hole, so that the roll core is effectively prevented from collapsing due to mechanical stress in a long-term use process, and the structural stability of the battery is kept.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a cylindrical battery. BACKGROUND

[0002] In the use process, the center hole (the center hole is formed by winding the core) of the cylindrical battery will collapse with the core in the charging and discharging process, and the risk of short circuit or failure may be caused in serious cases. In order to solve the technical problem, the prior art usually installs a center tube in the center hole. The center tube not only can provide support to prevent the core from collapsing, but also can play the role of heat conduction, exhaust or heat dissipation. Further, in order to ensure that the electrolyte can soak the inside of the core during the liquid injection process, the circumferential wall of the center tube is usually provided with a through hole penetrating the circumferential wall. Thus, during the liquid injection process, the electrolyte injected along the center hole flows to the inside of the core through the through hole, thereby completing the soaking.

[0003] In order to ensure the supporting effect of the center tube and prevent the electrolyte in the inside of the core from flowing into the center tube through the through hole, causing adverse effects, the diameter of the through hole cannot be set too large. However, if the diameter of the through hole is set too small, the electrolyte injected through the center hole will be retained in the center tube and cannot effectively reach the inside of the core, thereby reducing the soaking effect of the electrode and further reducing the performance of the battery cell. Therefore, it is necessary to improve the center tube to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides the following technical scheme to solve the above technical problems.

[0005] The utility model provides a cylindrical battery, comprising:

[0006] The core is wound to form a center hole;

[0007] The center tube is located in the center hole and has a circumferential wall, the center tube comprises a through hole and a Tesla valve, the through hole penetrates the circumferential wall, the Tesla valve is installed in the through hole, and the Tesla valve controls the communication of the through hole;

[0008] The electrolyte in the center tube can flow out to the core in one direction through the Tesla valve.

[0009] Adopting the technical scheme, the electrolyte injected into the center tube along the center hole can flow out to the roll core in one direction through the Tesla valve, so that the roll core is fully infiltrated, the infiltration interface of the pole piece is good, and the electrolyte in the roll core can be prevented from flowing into the center tube through the through hole, so that the effect of roll core liquid preservation is achieved.

[0010] Optionally, the difference between the diameter of the center hole and the outer diameter of the center tube is 1-2mm.

[0011] Optionally, the diameter of the center hole is 4-6mm, and the outer diameter of the center tube is 3-5mm.

[0012] Optionally, the thickness of the center tube is 0.5mm-1mm.

[0013] Optionally, the diameter of the through hole is 0.1-0.5mm.

[0014] Optionally, the through hole is multiple, and the multiple through holes are arranged along the circumferential direction of the center tube and the axial direction of the center tube.

[0015] Optionally, the spacing between two adjacent through holes in the circumferential direction is 1-2mm, and the spacing between two adjacent through holes in the axial direction is 1-2mm.

[0016] Optionally, the Tesla valve has an inlet end and an outlet end, the electrolyte in the center tube can flow from the inlet end to the outlet end, the Tesla valve is provided with a main flow channel and multiple auxiliary flow channels, when the electrolyte in the center tube flows forward through the inlet end, the fluid flowing through the main flow channel and the auxiliary flow channels is consistent, and when the electrolyte outside the center tube flows reversely from the outlet end, the electrolyte in the auxiliary flow channel hinders the flow of the electrolyte in the main flow channel.

[0017] Optionally, the auxiliary flow channel is a curve, the auxiliary flow channel has a first end and a second end, the first end and the second end are communicated with the main flow channel, when the electrolyte in the center tube flows from the first end to the second end through the auxiliary flow channel, the electrolyte collides with the electrolyte in the main flow channel at a convergence point, and when the electrolyte in the center tube flows from the second end to the first end through the auxiliary flow channel, the flow direction of the electrolyte is consistent with the flow direction of the electrolyte in the main flow channel at the convergence point.

[0018] Optionally, the battery is a lithium ion battery. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure of the center tube in an embodiment of the utility model is shown Figure 1 ;

[0020] Figure 2 Structure of the Tesla valve in an embodiment of the present application Figure 1 ;

[0021] Figure 3 Structure of the Tesla valve in an embodiment of the present application Figure 2 ;

[0022] Figure 4 Connection structure of the Tesla valve and the center pipe in an embodiment of the present application Figure 1 ;

[0023] Figure 5 Connection structure of the Tesla valve and the center pipe in an embodiment of the present application Figure 2 ;

[0024] Figure 6 Structure of the center pipe in an embodiment of the present application Figure 2 ;

[0025] Figure 7 Structure of the center pipe in an embodiment of the present application Figure 3 ;

[0026] Figure 8 Structure of the center pipe in an embodiment of the present application Figure 4 .

[0027] (Symbol explanation)

[0028] 1 - center pipe, 2 - peripheral wall, 3 - through hole, 4 - Tesla valve, 5 - inlet end, 6 - outlet end, 7 - main flow channel, 8 - auxiliary flow channel, 9 - first end, 10 - second end, 11 - inner wall, 12 - outer wall, 13 - bifurcation point, 14 - convergence point, Z - peripheral direction, Y - axial direction, X1 - forward direction, X2 - reverse direction. DETAILED DESCRIPTION

[0029] The following embodiments of the present application will be described in greater detail by explaining specific embodiments with reference to the drawings. Although the description will be introduced with reference to preferred embodiments, it is not intended to represent that the present application is limited to only the embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents falling within the scope of the present application. In order to provide a thorough understanding of the present application, numerous specific details are described in the following description. However, it is understood that these details are not intended to limit the present application. In addition, well-known functions or constructions are not described in detail to avoid obscuring the present application. It is also understood that the embodiments in the present application and the features in the embodiments can be combined with each other if there is no conflict.

[0030] The terms "first", "second", and the like are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0031] It should be noted that in the present specification, similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0033] As shown in Figures 1-4 The present application provides a cylindrical battery, which comprises a winding core and a center tube 1. The winding core is wound to form a center hole, wherein the winding core comprises a positive electrode sheet, a negative electrode sheet and a separator. The center tube 1 is located in the center hole, and has a peripheral wall 2. The center tube 1 comprises a through hole 3 and a Tesla valve 4. The through hole 3 penetrates the peripheral wall 2, and the Tesla valve 4 is installed in the through hole 3. The Tesla valve 4 controls the communication of the through hole 3. The electrolyte located in the center tube 1 can flow out to the winding core in one direction through the Tesla valve 4.

[0034] The present application sets the Tesla valve 4 in the through hole 3, and uses the one-way conduction characteristic of the Tesla valve 4, so that the electrolyte injected into the center tube 1 along the center hole can flow out to the winding core in one direction through the Tesla valve 4, thereby fully soaking the inside of the winding core, making the soaking interface of the electrode sheet good, and also preventing the electrolyte in the inside of the winding core from flowing into the center tube 1 through the through hole 3, thereby achieving the effect of liquid preservation of the winding core. Furthermore, by setting the Tesla valve 4 in the through hole 3, the center tube 1 can still provide support for the winding core and the center hole, thereby effectively preventing the winding core from collapsing due to mechanical stress during long-term use, thereby maintaining the structural stability of the battery.

[0035] like Figures 2-5 As shown, the Tesla valve 4 has an inlet end 5 and an outlet end 6. The electrolyte located in the central tube 1 can flow from the inlet end 5 to the outlet end 6 (the flow path of the electrolyte is as follows). Figures 2-3 X1 and Figures 4-5 (As shown by the arrow in the image), the Tesla valve 4 has a main flow channel 7 and multiple secondary flow channels 8. The electrolyte located in the central tube 1 flows forward through the inlet end 5 (as shown by the arrow in the image). Figures 2-3 When the fluid flows in the X1 direction (as shown in the image), the fluid flowing through the main flow channel 7 and the secondary flow channel 8 flows in the same direction. The electrolyte located outside the central tube 1 flows in the opposite direction from the outlet end 6 (e.g., ...). Figures 2-3 When the electrolyte flows in the X2 direction (in the main flow direction), the electrolyte in the secondary flow channel 8 obstructs the flow of the electrolyte in the main flow channel 7. This causes the electrolyte in the central tube 1 to flow only along the positive X1 direction from the central tube 1 to the inside of the core (i.e., from the inner wall 11 to the outer wall 12 of the central tube 1), and not from the inside of the core or the outside of the central tube 1 to the inside of the central tube 1 (i.e., from the outer wall 12 to the inner wall 11 of the central tube 1), thus achieving the effect of retaining electrolyte in the core. In other words, the Tesla valve 4 of the above structure has a unidirectional conduction characteristic. When the electrolyte flows along the positive X1 direction of the Tesla valve 4, the fluid can pass smoothly. When it flows in the opposite direction X2 (i.e., in reverse) along the positive flow direction of the Tesla valve 4, the structure of the Tesla valve 4 has a blocking effect on the fluid. Therefore, the resistance of the electrolyte flowing in the reverse direction increases, thus greatly slowing down the flow of the electrolyte, making it almost impossible for the fluid to conduct in the reverse direction (reverse X2), thereby achieving the effect of unidirectional conduction.

[0036] Furthermore, referring to Figures 1-4, the Tesla valve 4 has bifurcation points 13 and convergence points 14, and the internal main flow channel 7 is a broken line, forming multiple bifurcation points 13 and convergence points 14 with multiple sub-flow channels 8. The electrolyte in the center tube 1 flows from the outlet end 6 to the bifurcation points 13 and then flows into the main flow channel 7 and the sub-flow channel 8, respectively. The sub-flow channel 8 is a curved line, and the sub-flow channel 8 has a first end 9 and a second end 10, which are in communication with the main flow channel 7. When the electrolyte in the center tube 1 flows through the first end 9 of the sub-flow channel 8 to the second end 10, it collides with the electrolyte in the main flow channel 7 at the convergence point 14. When the electrolyte in the center tube 1 flows through the second end 10 of the sub-flow channel 8 to the first end 9, it flows in the same direction as the electrolyte in the main flow channel 7 at the convergence point 14. Thus, when the electrolyte flows from the outlet end 6 to the inlet end 5 (i.e., the electrolyte flows from the outer wall 12 of the center tube 1 to the inner wall 11 of the center tube 1), it collides with the electrolyte in the main flow channel 7 at the convergence point 14 when it flows through the first end 9 of the sub-flow channel 8 to the second end 10, resulting in a greater loss of kinetic energy of the electrolyte, thereby preventing the electrolyte from flowing from the outlet end 6 to the inlet end 5. When the electrolyte flows from the inlet end 5 to the outlet end 6, it flows through the second end 10 of the sub-flow channel 8 to the first end 9, which flows in the same direction as the electrolyte in the main flow channel 7 at the convergence point 14, thereby not causing a loss of kinetic energy of the electrolyte itself, thereby allowing the electrolyte in the center tube to flow from the inlet end 5 to the outlet end 6.

[0037] Further, in the above embodiments, the difference between the diameter of the center hole and the outer diameter of the center tube 1 (e.g., d1 in Figure 6 ) is 1-2 mm. Thus, the center tube 1 is easily placed in the center hole formed by winding the core, and the center tube also provides better support for the center hole.

[0038] Further, in the above embodiments, the diameter of the center hole is 4-6 mm, and the outer diameter d1 of the center tube 1 is 3-5 mm.

[0039] Further, as shown in Figure 7 , in the above embodiments, the thickness d2 of the center tube 1 is 0.5 mm-1 mm. The thickness d2 of the center tube 1 determines the depth of the through hole 3, i.e., the space in which the Tesla valve 4 can be installed. If the thickness of the center tube 1 is too small, the depth of the through hole 3 may not be sufficient to accommodate the Tesla valve 4, resulting in difficulty or inability to install the Tesla valve 4. Controlling the thickness d2 within the range of 0.5 mm to 1 mm provides sufficient space for installing the Tesla valve 4, thereby facilitating the installation of the Tesla valve 4 into the through hole 3.

[0040] Further, in the above embodiments, the diameter of the through hole 3 is 0.1-0.5mm. Controlling the diameter of the through hole 3 within the above range can precisely control the flow rate of the electrolyte, ensuring that the electrolyte is slowly and evenly distributed to the inside of the jelly-roll, thereby improving the wettability of the electrode material and the overall performance of the battery.

[0041] Further, as shown in Figure 1 , in the above embodiments, the through hole 3 is multiple, and the multiple through holes 3 are arranged along the circumferential direction (for example, the Z direction in Figure 1 and Figure 8 ) of the center tube and the axial direction (for example, the Y direction in Figure 1 and Figures 6-7 ) of the center tube, respectively. With this arrangement, it is ensured that the electrolyte can flow out evenly in the circumferential direction Z of the jelly-roll, and each through hole 3 becomes a channel for the electrolyte flow, so that the electrolyte can be evenly distributed around the jelly-roll, reducing the situation of local electrolyte deficiency, improving the wettability, and in addition, the weight of the battery can be reduced.

[0042] Further, as shown in Figure 8 , in the above embodiments, the spacing d3 between two adjacent through holes 3 along the circumferential direction Z is 1-2mm, and the spacing d4 between two adjacent through holes 3 along the axial direction Y is 1-2mm. With this arrangement, the evenly distributed through holes 3 along the circumferential direction Z ensure that the electrolyte can flow out evenly in the circumferential direction Z of the jelly-roll, and the evenly distributed through holes 3 along the axial direction further ensure that the electrolyte can also flow out evenly in the length direction of the jelly-roll. In this way, no matter which part of the jelly-roll, the electrolyte can reach through the nearest through hole 3, thereby improving the wettability and wettability rate of the entire jelly-roll. Furthermore, the evenly distributed through holes 3 along the axial direction Y and the circumferential direction Z also help to dissipate heat inside the battery.

[0043] Further, in the above embodiments, the battery is a lithium ion battery with high energy density and good safety performance.

[0044] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the foregoing is a further detailed description of the present application, and the specific implementation of the present application should not be limited to these descriptions. Those skilled in the art can make various changes in form and details without departing from the spirit and scope of the present application, including making a number of simple deductions or substitutions.

Claims

1. A cylindrical battery, characterized by comprising: The application relates to a battery, comprising: a winding core, which is wound to form a central hole; a central tube, which is located in the central hole and has a peripheral wall, the central tube comprising a through hole and a Tesla valve, the through hole penetrating the peripheral wall, and the Tesla valve being installed in the through hole and controlling the communication of the through hole; electrolyte located in the central tube can flow out to the winding core in one direction through the Tesla valve.

2. The cylindrical battery according to claim 1, characterized by The difference between the diameter of the central hole and the outer diameter of the central tube is 1-2 mm.

3. The cylindrical battery according to claim 2, characterized by The diameter of the central hole is 4-6 mm, and the outer diameter of the central tube is 3-5 mm.

4. The cylindrical battery according to claim 1, characterized by The thickness of the central tube is 0.5-1 mm.

5. The cylindrical battery according to claim 1, wherein The diameter of the through hole is 0.1-0.5 mm.

6. The cylindrical battery according to claim 1, wherein The through hole is multiple, and the multiple through holes are arranged along the peripheral direction of the central tube and the axial direction of the central tube.

7. The cylindrical battery according to claim 6, characterized by The interval between two adjacent through holes along the peripheral direction is 1-2 mm, and the interval between two adjacent through holes along the axial direction is 1-2 mm.

8. The cylindrical battery according to claim 1, wherein The Tesla valve has an inlet end and an outlet end, electrolyte located in the central tube can flow from the inlet end to the outlet end, the Tesla valve is provided with a main flow channel and multiple auxiliary flow channels, when the electrolyte located in the central tube flows forward through the inlet end, the fluid flowing through the main flow channel and the auxiliary flow channels has the same flow direction, and when the electrolyte located outside the central tube flows reversely from the outlet end, the electrolyte in the auxiliary flow channels hinders the flow of the electrolyte in the main flow channel.

9. The cylindrical battery according to claim 8, characterized by The auxiliary flow channel is in a curve shape, the auxiliary flow channel has a first end and a second end, the first end and the second end are communicated with the main flow channel, when the electrolyte located in the central tube flows from the first end to the second end through the auxiliary flow channel, the electrolyte collides with the electrolyte in the main flow channel at a convergence point, and when the electrolyte located in the central tube flows from the second end to the first end through the auxiliary flow channel, the electrolyte has the same flow direction as the electrolyte flowing in the main flow channel at the convergence point.

10. The cylindrical battery according to any one of claims 1 to 8, characterized by The battery is a lithium ion battery.

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