Cylindrical battery shell structure

Abstract

The utility model discloses a cylindrical battery shell structure which comprises a cylindrical shell, a cylindrical roll core is arranged in the cylindrical shell, limiting rings are arranged at the two ends of the interior of the cylindrical shell, a plurality of rifling grooves are formed in the inner surface of the cylindrical shell, clamping grooves are formed in the two ends of each rifling groove, and the limiting rings are installed on the clamping grooves. According to the technical scheme provided by the utility model, the clamping groove and the rifling groove with the flow guide function are additionally arranged in the shell, so that the cylindrical roll core can be well fixed, the displacement perpendicular to the direction of the cover plate is reduced, and the external force borne by the cylindrical roll core is jointly borne by the welding part of the cylindrical shell and the tab cover plate; the damage in the form of tearing or mechanical fatigue and the like to a welding part and parts is reduced, an electrolyte internal passage is increased, the electrolyte flows and infiltrates in the battery cell more quickly, the liquid injection time is shortened, and the liquid injection resistance is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a cylindrical battery shell structure. Background Art

[0002] The welding between the cylindrical winding core pole lug collector and the cover plate is mostly achieved by adding a connecting piece in the middle for soft connection, or directly welding the collector to the cover plate for hard connection. Apart from this, the winding core has no other position limiting components inside the shell, and the cylindrical shell technical solution is mostly a double-pass or single-pass shell formed by stamping or extrusion, with a smooth inner surface without protrusions.

[0003] During the impact and vibration tests of the battery, all the forces are borne by the welding between the pole ear and the cover plate; when the battery is filled with liquid, the electrolyte flows into the gap between the positive and negative electrode diaphragms of the battery through the filling hole and the gap between the winding core and the shell wall to soak the entire pole winding.

[0004] During vibration and impact tests of cylindrical batteries, or during daily vehicle installation and use, the core is subjected to forces perpendicular to the cover plate, which are all borne by the welding between the tab collector, the connecting piece and the cover plate. Under the impact of instantaneous high acceleration or after long-term bumpy vibrations during vehicle driving, the above welds and connectors will fall off or structural parts will break due to metal fatigue, shortening the battery life and even causing safety hazards.

[0005] In addition, the cylindrical injection is mostly for the positive terminal. The existing cylindrical design has a smooth internal shell that fits the core without any extra space. The electrolyte completely soaks the entire battery cell, resulting in high resistance. Utility Model Content

[0006] Technical problems to be solved by utility models

[0007] The technical problem to be solved by the utility model is to provide a cylindrical battery shell structure, which solves the problems of poor force distribution and large electrolyte flow resistance of the existing cylindrical battery.

[0008] Technical Solution

[0009] In order to solve the above problems, the technical solution provided by the utility model is:

[0010] A cylindrical battery shell structure comprises a cylindrical shell, a cylindrical winding core is arranged inside the cylindrical shell, limiting rings are arranged at both ends of the cylindrical shell, a plurality of rifling grooves are arranged on the inner surface of the cylindrical shell, clamping grooves are arranged at both ends of the rifling grooves, and the limiting rings are installed on the clamping grooves.

[0011] Furthermore, the limiting ring is composed of an annular collar and a plurality of protrusions evenly distributed on the annular collar.

[0012] Furthermore, the protrusion is an arc-shaped protrusion, and a plurality of the protrusions are evenly distributed and arranged around the annular ring.

[0013] Furthermore, the protrusion is made of elastic material.

[0014] Furthermore, the plurality of rifling grooves inside the cylindrical shell are arranged and distributed in sequence, and the distances between adjacent rifling grooves are the same.

[0015] Furthermore, the rifling groove becomes an inclined straight groove after being expanded.

[0016] Furthermore, the rifling groove is embedded in the inner surface of the cylindrical shell.

[0017] Furthermore, the protrusion height of the protrusion of the limiting ring needs to be set corresponding to the depth of the groove of the cylindrical shell.

[0018] Beneficial Effects

[0019] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0020] The technical solution provided by the utility model increases a card slot and a rifling groove with a flow-guiding function inside the shell, so that the cylindrical winding core can be well fixed, and the displacement perpendicular to the cover plate direction is reduced. The external force on the cylindrical winding core is shared by the welding parts of the cylindrical shell and the pole lug cover plate, thereby reducing damage to the welding parts and components in the form of tearing or mechanical fatigue, and increases the internal passage of the electrolyte, so that the electrolyte flows and infiltrates more rapidly inside the battery cell, shortening the injection time and reducing the injection resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a cylindrical winding core 9 according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the limit ring 6 of an embodiment of the utility model;

[0023] Figure 3 This is a schematic structural diagram of a cylindrical housing 5 according to an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the internal structure of the cylindrical housing 5 of the embodiment of the utility model;

[0025] Figure 5 It is a cross-sectional view of the cylindrical housing 5 of the embodiment of the utility model;

[0026] Figure 6 Based Figure 5 The enlarged view of point A in the middle;

[0027] Figure 7 This is a schematic diagram of electrolyte flow in an embodiment of the utility model;

[0028] Figure 8 The figure is a schematic diagram of the installation process of an embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0030] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in the present application can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.

[0031] Example

[0032] Combined with Figure 1-8A cylindrical battery shell structure is composed of a cylindrical shell 5, a cylindrical winding core 9 installed inside the cylindrical shell 5, and a limiting ring 6 installed between the cylindrical winding core 9 and the cylindrical shell 5. Two limiting rings 6 are provided, which are respectively installed at the two ends of the cylindrical winding core 9, that is, the limiting rings 6 are installed on both sides of the cylindrical shell 5.

[0033] The cylindrical shell 5 is used to cover the cylindrical winding core 9. Both ends of the cylindrical shell 5 are provided with detachable top covers. The cylindrical shell 5 is preferably an aluminum shell or a steel shell.

[0034] The inner surface of the cylindrical shell 5 is provided with a plurality of rifling grooves 3, and the rifling grooves 3 are groove structures that are evenly distributed and arranged in sequence.

[0035] The rifling grooves 3 are embedded in the inner surface of the cylindrical shell 5. The rifling grooves 3 are directly machined by the end wall of the inner surface of the cylindrical shell 5 using a machine tool. The distances between adjacent rifling grooves 3 are the same. The rifling grooves 3 are used to conduct electrolyte. When the cylindrical shell 5 is filled with liquid, the electrolyte is transferred from one end to the other end. Due to the presence of the rifling grooves 3, when the electrolyte flows, the rifling grooves 3 can serve as a passage for the electrolyte to flow, thereby reducing the resistance to the flow of the electrolyte.

[0036] The rifling groove 3 is a straight groove with a certain inclination angle after being unfolded. Therefore, the surrounding groove formed by rotating the inclined straight groove about the center line of the cylindrical shell 5 is the rifling groove 3. By arranging a plurality of rifling grooves 3 arranged at the same intervals, the rifling grooves 3 can be evenly distributed and arranged around the inner surface of the cylindrical shell 5, thereby achieving sufficient conduction of the electrolyte to assist the flow of the electrolyte.

[0037] The cylindrical shell 5 has slots 4 at both ends thereof. The slots 4 are arranged at both ends of the rifling groove 3. The slots 4 are used to cooperate with the limit rings 6. The limit rings 6 are installed in the slots 4 to achieve relative limitation between the cylindrical winding core 9 and the cylindrical shell 5. The slots 4 are formed by cutting or grinding the end walls of the cylindrical shell 5 through machine tools.

[0038] The limiting ring 6 is composed of an annular collar 8 and a plurality of protrusions 7 evenly distributed on the annular collar 8. The protrusions are made of elastic material, preferably rubber material.

[0039] The annular collar 8 is used to be mounted on both ends of the cylindrical winding core 9.

[0040] The protrusion 7 is an arc-shaped protrusion, and the arc-shaped protrusion is a structure with two ends fixed on the annular ring 8 and a protruding middle.

[0041] There are multiple protrusions 7, and the distances between each protrusion 7 are equal to achieve a stable limiting effect. The number of protrusions 7 is preferably 8.

[0042] A slight difference needs to be set between the outer diameter of the cylindrical winding core 9 and the inner diameter of the annular collar 8 of the limiting ring 6 , and a margin is left in the annular collar 8 to facilitate the cylindrical winding core 9 to be put on the limiting ring 6 .

[0043] The protrusion height of the protrusion 7 of the limiting ring 6 needs to match the slot 4 of the cylindrical shell 5 to ensure that after the cylindrical winding core 9 is installed into the cylindrical shell 5 with the limiting ring 6, the limiting ring 6 can limit the movement of the cylindrical winding core 9 in the cylindrical shell 5.

[0044] After the cylindrical shell 5 is injected with electrolyte, the cylindrical winding core 9 will expand due to the infiltration of electrolyte, so that the cylindrical winding core 9, the limiting ring 6 and the inner wall of the cylindrical shell 5 are firmly stuck.

[0045] The cylindrical battery formed by the above technical solution, when undergoing impact and vibration tests in safety tests, or when subjected to vibration and bumps during driving after being loaded on a vehicle, has its displacement perpendicular to the cover plate reduced because the cylindrical core 9 is fixed, and the external force on the cylindrical core 9 is shared by the welding parts of the cylindrical shell 5 and the pole lug cover plate (top cover), reducing damage to the welding parts and components in the form of tearing or mechanical fatigue.

[0046] In addition, an electrolyte guide groove (rifling groove 3) is added between the card slots 4 across both sides of the cylindrical winding core 9, so that the electrolyte can flow more easily through the entire shell when the cylindrical battery is filled, reducing the filling pressure. The electrolyte flowing in the rifling groove 3 can quickly reach from the filling end of the cylindrical shell 5 to the other end.

[0047] The injection port can be set on the top cover of the cylindrical shell 5 or on the two side end walls of the cylindrical shell 5. The conventional choice is that the cylindrical injection hole is on the top cover at both ends. The external injection equipment is connected to the injection port for injection. When injecting, it is only necessary to inject on one side, so that the electrolyte flows to the other side by itself, so as to achieve the purpose of completely soaking the cylindrical core 9.

[0048] The installation process of cylindrical batteries is as follows:

[0049] S1: Insert the limiting ring 6 into one side of the cylindrical winding core 9;

[0050] S2: insert the cylindrical winding core 9 with the limiting ring 6 on one side into the cylindrical shell 5;

[0051] S3: Push the cylindrical winding core 9 to the inner end of the slot 4 so that the cylindrical winding core 9 on the side not covered with the limiting ring 6 extends out of the cylindrical shell 5, and then cover the other limiting ring 6 on the cylindrical winding core 9;

[0052] S4: Insert the extended part of the cylindrical winding core 9 back into the cylindrical shell 5 to complete the assembly.

[0053] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A cylindrical battery housing structure, characterized in that: It comprises a cylindrical shell, a cylindrical winding core is arranged inside the cylindrical shell, limiting rings are arranged at both ends of the cylindrical shell, a plurality of rifling grooves are arranged on the inner surface of the cylindrical shell, clamping grooves are arranged at both ends of the rifling grooves, and the limiting rings are installed on the clamping grooves.

2. A cylindrical battery housing structure according to claim 1, characterized in that: The limiting ring is composed of an annular collar and a plurality of protrusions evenly distributed on the annular collar.

3. A cylindrical battery housing structure according to claim 2, characterized in that: The protrusion is an arc-shaped protrusion, and a plurality of the protrusions are evenly distributed and arranged around the annular ring.

4. A cylindrical battery housing structure according to claim 2, characterized in that: The protrusion is made of elastic material.

5. A cylindrical battery housing structure according to claim 1, characterized in that: The plurality of rifling grooves inside the cylindrical shell are arranged and distributed in sequence, and the distances between adjacent rifling grooves are the same.

6. A cylindrical battery housing structure according to claim 1, characterized in that: The rifling groove is an inclined straight groove after being expanded.

7. A cylindrical battery housing structure according to claim 1, characterized in that: The rifling groove is embedded in the inner surface of the cylindrical shell.

8. A cylindrical battery housing structure according to claim 2, characterized in that: The protrusion height of the limiting ring must be set corresponding to the depth of the groove of the cylindrical shell.

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