Cylindrical battery cell and electric equipment

Abstract

The utility model discloses a cylindrical battery cell and electric equipment. The cylindrical battery cell comprises: a housing; the first cover plate is arranged at one end, along the length direction of the cylindrical battery core, of the shell and is connected with the shell in a sealing manner; the second cover plate is arranged at the other end, in the length direction of the cylindrical battery cell, of the shell and is connected with the shell in a sealing manner; the positive terminal is arranged on the first cover plate, and the positive terminal is conductively connected with the second cover plate through the first cover plate and the shell; and the negative terminal is arranged on the first cover plate, and the negative terminal is insulated from the first cover plate. In the cylindrical battery cell, the positive terminal and the negative terminal are both arranged on the first cover plate, so that the positive terminal and the negative terminal can be arranged on the same side of the cylindrical battery cell, the axial space utilization rate of the cylindrical battery cell can be further increased, the capacity of the battery cell is effectively improved, and the energy density of the battery cell is improved.

Description

Technical Field

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

[0002] In the related art, the positive electrode and the negative electrode of the cylindrical battery cell are respectively arranged on both sides of the cylindrical battery cell. However, this will lead to a decrease in the space utilization rate of the cylindrical battery cell in the axial direction, thereby reducing the energy density of the cylindrical battery cell. Utility Model Content

[0003] The utility model provides a cylindrical battery core and an electrical device to solve at least one of the above-mentioned technical problems.

[0004] The utility model provides a cylindrical battery core comprising:

[0005] case;

[0006] A first cover plate, the first cover plate is arranged at one end of the shell along the length direction of the cylindrical battery cell and is sealed and connected to the shell;

[0007] A second cover plate, the second cover plate is arranged at the other end of the shell along the length direction of the cylindrical battery core and is sealed and connected to the shell;

[0008] A positive terminal, the positive terminal is disposed on the first cover plate, and the positive terminal is conductively connected to the second cover plate through the first cover plate and the shell;

[0009] A negative terminal is provided on the first cover plate, and the negative terminal is insulated from the first cover plate.

[0010] In the above cylindrical battery cell, the positive terminal and the negative terminal are both arranged on the first cover plate, so that the positive terminal and the negative terminal can be arranged on the same side of the cylindrical battery cell, thereby increasing the axial space utilization of the cylindrical battery cell, effectively improving the capacity of the battery cell, and improving the energy density of the battery cell.

[0011] In an optional technical solution of the present invention, the cylindrical battery cell includes a first insulating member, a negative current collector and a negative electrode column. A accommodating cavity is provided in the shell, the first insulating member and the negative current collector are located in the accommodating cavity, the negative electrode column passes through the first insulating member and connects the negative current collector and the negative terminal, and the first insulating member separates the first cover plate and the negative current collector.

[0012] In an optional technical solution of the present invention, a first groove is provided on the surface of the first insulating member facing the first cover plate, the positive terminal passes through the first cover plate, and the bottom of the positive terminal is accommodated in the first groove.

[0013] In an optional technical solution of the present invention, the cylindrical battery cell includes a second insulating member, which is arranged between the negative terminal and the first cover plate, and the negative electrode column passes through the first cover plate and the second insulating member and is connected to the negative terminal.

[0014] In an optional technical solution of the present invention, a second groove is provided on the surface of the second insulating member facing the negative terminal, and the negative terminal is partially accommodated in the second groove.

[0015] In an optional technical solution of the present invention, the first insulating member is provided with a first through hole, the first cover plate is provided with a second through hole, the axis of the first through hole coincides with the axis of the second through hole, the aperture of the second through hole is smaller than the aperture of the first through hole, the negative electrode column comprises a negative electrode base and a negative electrode column, the negative electrode base connects the negative electrode column and the negative electrode collector, the cylindrical battery cell comprises a seal, the seal is at least partially located in the first through hole, the negative electrode column passes through the seal and the second through hole and is connected to the negative terminal, the seal seals the negative electrode base and the first cover plate and electrically isolates the negative electrode base and the first cover plate.

[0016] In an optional technical solution of the present invention, the first cover plate is provided with a liquid injection hole, the liquid injection hole is connected to the accommodating cavity, and the negative electrode current collecting plate is provided with a third through hole along the thickness direction, the third through hole is connected to the liquid injection hole and the accommodating cavity.

[0017] In an optional technical solution of the present invention, the positive terminal and the negative terminal have different shape structures.

[0018] In an optional technical solution of the present utility model, a accommodating cavity is provided in the shell, the cylindrical battery cell includes a positive current collector disk, the positive current collector disk is located in the accommodating cavity, the second cover plate is connected to the positive current collector disk, and the positive current collector disk is conductively connected to the positive terminal through the second cover plate, the shell and the first cover plate.

[0019] An electric device of the utility model comprises the cylindrical battery core of any one of the above schemes.

[0020] In the above electrical equipment, the positive terminal and the negative terminal are both arranged on the first cover plate, so that the positive terminal and the negative terminal can be arranged on the same side of the cylindrical battery cell, thereby increasing the axial space utilization of the cylindrical battery cell, effectively improving the capacity of the battery cell, and improving the energy density of the battery cell.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 It is a schematic structural diagram of a cylindrical battery cell according to an embodiment of the utility model;

[0024] Figure 2 It is an exploded schematic diagram of a cylindrical battery cell according to an embodiment of the present utility model;

[0025] Figure 3 It is a cross-sectional schematic diagram of a cylindrical battery cell according to an embodiment of the utility model;

[0026] Figure 4 yes Figure 3 An enlarged schematic diagram of part A of the cylindrical battery cell.

[0027] Description of main component reference numerals:

[0028] Cylindrical battery cell 100, shell 12, first cover plate 14, second cover plate 16, positive terminal 18, negative terminal 20, first opening 22, second opening 24, accommodating chamber 26, first insulating member 28, negative current collecting disc 30, negative electrode column 32, first groove 34, mounting hole 36, second insulating member 38, second groove 40, first through hole 42, second through hole 44, negative electrode base 46, negative electrode column 48, sealing member 50, assembly hole 52, assembly part 54, injection hole 56, third through hole 58, fourth through hole 60, explosion-proof valve 62, positive current collecting disc 64. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of the present utility model, it should be noted that, 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 directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. 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.

[0035] See also Figures 1 to 4 A cylindrical battery cell 100 according to an embodiment of the present invention includes a housing 12 , a first cover plate 14 , a second cover plate 16 , a positive terminal 18 and a negative terminal 20 .

[0036] The first cover plate 14 is disposed at one end of the housing 12 along the length direction of the cylindrical battery cell 100. The first cover plate 14 is sealed and connected to the housing 12.

[0037] The second cover plate 16 is provided at the other end of the housing 12 along the length direction of the cylindrical battery cell 100. The second cover plate 16 is sealed and connected to the housing 12. The positive terminal 18 is provided on the first cover plate 14, and the positive terminal 18 is conductively connected to the second cover plate 16 through the first cover plate 14 and the housing 12. The negative terminal 20 is provided on the first cover plate 14, and the negative terminal 20 is insulated from the first cover plate 14.

[0038] In the above-mentioned cylindrical battery cell 100, the positive terminal 18 and the negative terminal 20 are both arranged on the first cover plate 14, so that the positive terminal 18 and the negative terminal 20 can be arranged on the same side of the cylindrical battery cell 100, thereby increasing the axial space utilization of the cylindrical battery cell 100, effectively improving the capacity of the battery cell, and improving the energy density of the battery cell.

[0039] Specifically, since the positive terminal 18 and the negative terminal 20 are both provided on the first cover plate 14, the two terminals can reuse the space on the same side of the cylindrical battery cell 100. The positive terminal 18 is not provided on the second cover plate 16. In the length direction of the cylindrical battery cell 100, the cylindrical battery cell 100 can reduce the space required for providing the positive terminal 18 on the second cover plate 16, and thus increase the axial space utilization of the cylindrical battery cell 100 under the condition of the same length, effectively improve the capacity of the battery cell, and improve the energy density of the battery cell.

[0040] Optionally, in Figure 2 In the embodiment, the housing 12 has a first opening 22 and a second opening 24 at both ends along the length direction of the cylindrical battery core 100. The first cover plate 14 is disposed at the first opening 22 and is sealed to the housing 12. The second cover plate 16 is disposed at the second opening 24 and is sealed to the housing 12.

[0041] A accommodating cavity 26 is provided in the shell 12, and the cylindrical battery cell 100 includes a winding core (not shown), which is formed by winding a positive electrode sheet, a negative electrode sheet, and a diaphragm. The positive and negative ends of the winding core are made by flattening or stacking, and the winding core is loaded into the accommodating cavity 26 of the shell 12. The positive electrode of the winding core can be connected to the second cover plate 16, and then connected to the positive terminal 18. Thus, the positive electrode of the winding core can be electrically connected to the positive terminal 18 through the second cover plate 16, the shell 12 and the first cover plate 14. The negative electrode of the winding core is connected to the negative terminal 20.

[0042] exist Figure 2 In the orientation shown, the length direction of the cylindrical battery cell 100 is along the up and down direction, the first opening 22 is the upper opening of the shell 12, the second opening 24 is the lower opening of the shell 12, the first cover plate 14 is the top cover plate of the cylindrical battery cell 100, and the second cover plate 16 is the bottom cover plate of the cylindrical battery cell 100.

[0043] Optionally, the second cover plate 16 and the housing 12 may be formed into an integral structure, or the second cover plate 16 and the housing 12 may be formed into separate structures, which is not specifically limited in the present invention.

[0044] The housing 12, the first cover plate 14, the second cover plate 16, the positive terminal 18 and the negative terminal 20 can all be made of conductive materials (such as metal materials). The present invention does not limit the specific materials of the housing 12, the first cover plate 14, the second cover plate 16, the positive terminal 18 and the negative terminal 20.

[0045] Optionally, the first cover plate 14 may be connected to the housing 12 by welding, and the second cover plate 16 may be connected to the housing 12 by welding. The welding method includes but is not limited to laser welding.

[0046] Optionally, the positive terminal 18 can be connected to the first cover plate 14 by welding. The negative terminal 20 is insulated from the first cover plate 14, so that the negative terminal 20 and the positive terminal 18 can be electrically isolated.

[0047] The present invention does not specifically limit the shapes of the positive terminal 18 and the negative terminal 20. Optionally, the shape of the negative terminal 20 is different from that of the positive terminal 18, so as to facilitate the identification of the positive terminal 18 and the negative terminal 20. Optionally, the surface of the first cover plate 14 facing away from the housing 12 may be provided with corresponding markings to indicate the positive terminal 18 and the negative terminal 20.

[0048] Optionally, the thickness of the positive terminal 18 is 1.3 mm to 2 mm, and the thickness of the negative terminal 20 is 1.3 mm to 2 mm.

[0049] In some embodiments, the cylindrical battery cell 100 includes a first insulating member 28, a negative current collector 30 and a negative electrode column 32. A housing 26 is provided in the shell 12. The first insulating member 28 and the negative current collector 30 are located in the housing 26. The negative electrode column 32 passes through the first insulating member 28 and connects the negative current collector 30 and the negative terminal 20. The first insulating member 28 separates the first cover plate 14 and the negative current collector 30.

[0050] Thus, the insulation between the first cover plate 14 and the negative electrode current collecting disk 30 can be ensured to a certain extent.

[0051] Specifically, the negative electrode collector 30 can connect the negative electrode of the winding core and the negative electrode column 32, and the negative terminal 20 is electrically connected to the negative electrode of the winding core through the negative electrode column 32 and the negative electrode collector 30. The negative electrode column 32 passes through the first cover plate 14 and is connected to the negative terminal 20, and the negative electrode column 32 is insulated from the first cover plate 14.

[0052] The present invention does not specifically limit the shape and material of the first insulating member 28. Optionally, the first insulating member 28 can be made of plastic. The shape of the first insulating member 28 is substantially the same as that of the first cover plate 14.

[0053] Alternatively, the negative electrode current collecting disc 30 may be a flexible current collecting disc.

[0054] In some embodiments, a first groove 34 is formed on a surface of the first insulating member 28 facing the first cover plate 14 , the positive terminal 18 passes through the first cover plate 14 , and the bottom of the positive terminal 18 is accommodated in the first groove 34 .

[0055] Thus, the space utilization of the cylindrical battery cell 100 in the axial direction can be further increased.

[0056] Specifically, in Figure 2 In the embodiment, the surface of the first insulating member 28 facing the first cover plate 14 is the upper surface of the first insulating member 28, and the upper surface of the first insulating member 28 is provided with a first groove 34, and the thickness of the first insulating member 28 is relatively small at the first groove 34. The bottom of the positive terminal 18 is accommodated in the first groove 34, which can reduce the height of the first cover plate 14, the positive terminal 18 and the first insulating member 28 after assembly, thereby further increasing the space utilization rate of the cylindrical battery cell 100 in the axial direction.

[0057] exist Figure 2 In the embodiment, the first cover plate 14 is provided with a mounting hole 36, and the positive terminal 18 is penetrated by the mounting hole 36. The mounting hole 36 can position the positive terminal 18, thereby improving the assembly efficiency of the cylindrical battery cell 100, and also facilitates the welding of the positive terminal 18 and the first cover plate 14, and ensures the connection stability of the positive terminal 18 and the first cover plate 14 to a certain extent.

[0058] In some embodiments, the cylindrical battery cell 100 includes a second insulating member 38 disposed between the negative terminal 20 and the first cover plate 14 , and the negative electrode column 32 passes through the first cover plate 14 and the second insulating member 38 and is connected to the negative terminal 20 .

[0059] Thus, insulation between the negative electrode terminal 20 and the first cover plate 14 is ensured to a certain extent.

[0060] Specifically, in Figure 2 and Figure 4 In the embodiment, the second insulating member 38 is located above the first cover plate 14. The second insulating member 38 is clamped between the first cover plate 14 and the negative terminal 20. The second insulating member 38 can separate the negative terminal 20 from the first cover plate 14, thereby achieving electrical isolation of the negative terminal 20 from the first cover plate 14.

[0061] The present invention does not specifically limit the shape and material of the second insulating member 38. Optionally, the second insulating member 38 can be made of plastic. The shape of the second insulating member 38 is substantially the same as that of the negative terminal 20.

[0062] In some embodiments, a second groove 40 is formed on a surface of the second insulating member 38 facing the negative terminal 20 , and the negative terminal 20 is partially accommodated in the second groove 40 .

[0063] Thus, the space utilization of the cylindrical battery cell 100 in the axial direction can be further increased.

[0064] Specifically, in Figure 2 In the embodiment, the surface of the second insulating member 38 facing the negative terminal 20 is the upper surface of the second insulating member 38, and the upper surface of the second insulating member 38 is provided with a second groove 40, and the thickness of the second insulating member 38 is relatively small at the second groove 40. The negative terminal 20 is partially accommodated in the second groove 40, which can reduce the height of the first cover plate 14, the negative terminal 20 and the second insulating member 38 after assembly, thereby further increasing the space utilization rate of the cylindrical battery cell 100 in the axial direction.

[0065] In addition, the second groove 40 can position the negative terminal 20, thereby improving the assembly efficiency of the cylindrical battery cell 100. After the negative terminal 20 is connected to the negative pole 32, the second insulating member 38 is clamped and fixed by the negative terminal 20 and the first cover plate 14. The negative terminal 20 is partially accommodated in the second groove 40. During the use of the cylindrical battery cell 100, relative displacement between the second insulating member 38 and the negative terminal 20 can be prevented to a certain extent, resulting in insulation failure between the negative terminal 20 and the first cover plate 14, thereby improving the reliability and safety of the cylindrical battery cell 100.

[0066] In some embodiments, the first insulating member 28 is provided with a first through hole 42, the first cover plate 14 is provided with a second through hole 44, the axis of the first through hole 42 coincides with the axis of the second through hole 44, the aperture of the second through hole 44 is smaller than the aperture of the first through hole 42, the negative electrode column 32 includes a negative electrode base 46 and a negative electrode column 48, the negative electrode base 46 connects the negative electrode column 48 and the negative electrode collector 30, the cylindrical battery cell 100 includes a seal 50, the seal 50 is at least partially located in the first through hole 42, the negative electrode column 48 passes through the seal 50 and the second through hole 44 and is connected to the negative terminal 20, the seal 50 seals the negative electrode base 46 and the first cover plate 14 and electrically isolates the negative electrode base 46 and the first cover plate 14.

[0067] Therefore, the sealing performance of the cylindrical battery cell 100 can be guaranteed to a certain extent.

[0068] Specifically, in Figure 2 In the illustrated embodiment, the first through hole 42 and the second through hole 44 are both cylindrical holes, the aperture of the through hole may refer to the diameter of the cylinder, and the axis of the through hole may refer to the center axis of the cylinder. It is understood that in other embodiments, the first through hole 42 and the second through hole 44 may also be holes of other shapes, not limited to cylindrical holes. When the through hole is a non-cylindrical hole, the aperture of the through hole may be the diameter of the circumscribed circle of the through hole, and the axis of the through hole may refer to the axis passing through the center of the circumscribed circle and perpendicular to the plane where the circumscribed circle is located.

[0069] The axis of the first through hole 42 coincides with the axis of the second through hole 44, which is conducive to the negative electrode column 48 passing through the first insulating member 28 and the first cover plate 14. The aperture of the second through hole 44 is smaller than the aperture of the first through hole 42, so that there is a portion of the first cover plate 14 surrounding the second through hole 44 above the first through hole 42. The portion of the first cover plate 14 above the first through hole 42 and the negative electrode base 46 can clamp and fix the sealing member 50, so that the sealing member 50 seals and connects the negative electrode base 46 and the first cover plate 14, thereby ensuring the sealing of the cylindrical battery cell 100 to a certain extent and preventing the cylindrical battery cell 100 from leaking electrolyte.

[0070] The seal 50 is made of insulating material, and can also electrically isolate the negative electrode base 46 from the first cover plate 14, thereby preventing the negative electrode column from short-circuiting with the charged first cover plate 14. Optionally, the seal 50 can be a sealing ring.

[0071] Optionally, combine Figure 2 and Figure 4 The hole wall of the second through hole 44 is also provided with an assembly hole 52, and the surface of the second insulating member 38 facing the first cover plate 14 is provided with an assembly portion 54, and the assembly portion 54 is accommodated in the assembly hole 52 to position the second insulating member 38, thereby further improving the connection stability and assembly efficiency of the second insulating member 38.

[0072] In some embodiments, the first cover plate 14 is provided with a liquid injection hole 56 , which is connected to the accommodating cavity 26 , and the negative electrode current collecting plate 30 is provided with a third through hole 58 along the thickness direction, which is connected to the liquid injection hole 56 and the accommodating cavity 26 .

[0073] In this way, the electrolyte can penetrate into the positions of the winding core corresponding to the third through holes 58, which can accelerate the infiltration of the electrolyte into the winding core.

[0074] Specifically, the negative electrode current collector 30 is located between the first cover plate 14 and the winding core. During the manufacturing process of the cylindrical battery cell 100, the electrolyte can be injected into the accommodating cavity 26 through the injection hole 56. After the electrolyte is injected from the injection hole 56, it will flow to the upper surface of the negative electrode current collector 30. The negative electrode current collector 30 is provided with a third through hole 58 along the thickness direction, so that the electrolyte on the upper surface of the negative electrode current collector 30 can flow to the winding core below the negative electrode current collector 30 through the third through hole 58, so that the electrolyte can be infiltrated into the position of the winding core corresponding to the third through hole 58, which can accelerate the infiltration of the electrolyte in the winding core.

[0075] Optionally, the negative electrode current collecting disc 30 is provided with a plurality of third through holes 58 along the thickness direction, and the plurality of third through holes 58 can be arranged at desired positions according to actual needs.

[0076] Optionally, the first insulating member 28 is provided with a fourth through hole 60 at a position corresponding to the injection hole 56 , so that the electrolyte entering from the injection hole 56 can reach the negative electrode current collecting disc 30 and the winding core more quickly through the fourth through hole 60 .

[0077] Optionally, after the electrolyte is injected, the injection hole 56 may be sealed by welding, or the injection hole 56 may be sealed with a glue nail to prevent leakage of the electrolyte.

[0078] In some embodiments, the positive terminal 18 and the negative terminal 20 have different shapes and configurations.

[0079] In this way, a fool-proof design can be achieved to avoid the situation where the positive and negative poles are connected incorrectly.

[0080] Specifically, in Figure 2 In the illustrated embodiment, the negative terminal 20 has a substantially cylindrical shape. The positive terminal 18 has a substantially racetrack shape, and thus the negative terminal 20 and the positive terminal 18 have different shapes, which prevents the positive and negative electrodes from being connected incorrectly when welding the positive and negative electrodes to the connecting piece.

[0081] It can be understood that in other embodiments, the shape structure of the negative terminal 20 is not limited to the cylindrical shape, and the shape structure of the positive terminal 18 is not limited to the racetrack shape. The positive terminal 18 and the negative terminal 20 can also have other shape structures that can distinguish the positive terminal 18 and the negative terminal 20. The present invention does not make specific limitations on this.

[0082] In some embodiments, the cylindrical battery cell 100 includes an explosion-proof valve 62 , which is disposed on the first cover plate 14 .

[0083] Thus, the cylindrical battery cell 100 can be prevented from exploding to a certain extent.

[0084] Specifically, during the use of the cylindrical battery cell 100, the electrolyte will release gas, causing the gas pressure inside the housing 12 to increase. The explosion-proof valve 62 can be opened when the gas pressure inside the housing 12 increases to a set threshold value to release the high-pressure gas inside the housing 12, thereby preventing the cylindrical battery cell 100 from exploding due to the internal high pressure to a certain extent, thereby improving the safety of the cylindrical battery cell 100.

[0085] In some embodiments, a housing cavity 26 is provided in the shell 12, and the cylindrical battery cell 100 includes a positive current collector 64, which is located in the housing cavity 26, and the second cover plate 16 is connected to the positive current collector 64, and the positive current collector 64 is conductively connected to the positive terminal 18 through the second cover plate 16, the shell 12 and the first cover plate 14.

[0086] This allows the positive electrode current collecting disk 64 and the positive electrode terminal 18 to be electrically connected.

[0087] Specifically, the positive electrode of the winding core can be connected to the positive electrode collector plate 64 (such as welding connection), and the positive electrode of the winding core is conductively connected to the positive terminal 18 through the positive electrode collector plate 64, the second cover plate 16, the shell 12 and the first cover plate 14, thereby achieving electrical connection between the positive electrode of the winding core and the positive terminal 18.

[0088] Alternatively, the positive current collecting disc 64 may be a flexible current collecting disc.

[0089] In one embodiment of the utility model, the winding core is formed by winding the positive electrode sheet, the negative electrode sheet, and the separator. The positive and negative ends of the winding core are made by flattening or stacking. One end is the positive electrode area, which can be laser welded on the positive current collector 64. The positive current collector 64 is welded to the second cover plate 16. The second cover plate 16 is welded to one end of the shell 12 to form a positive terminal, that is, the shell 12 is strongly positively charged. The other end of the winding core is the negative electrode area, which is laser welded on the negative current collector 30. A first insulating member 28 is provided between the first cover plate 14 and the negative current collector 30. In addition, the negative electrode collector 30 is designed with a suitable third through hole 58. After the electrolyte is injected through the injection hole 56, the electrolyte falls into various positions on the top surface of the winding core through the third through hole 58, so that the electrolyte can penetrate into various positions of the winding core. The seal 50 and the second insulating member 38 are used between the negative terminal 20 and the first cover plate 14 to prevent short circuit caused by contact with the charged first cover plate 14. The positive terminal 18 and the negative terminal 20 are arranged on the same cover plate (on the first cover plate 14). The positive terminal 18 can be connected to the first cover plate 14 in an integrated manner. Selecting a suitable thickness of the positive and negative terminals can eliminate the risk of welding through the module during welding. If the connecting piece is directly welded to the first cover plate 14 (the first cover plate 14 is relatively thin), there is a risk of welding through the first cover plate 14, resulting in leakage of the battery cell and causing safety hazards.

[0090] The cylindrical battery cell 100 of the present invention can be manufactured through the following steps.

[0091] 1. Weld the positive terminal 18 and the first cover plate 14 together (sealed state); then install the explosion-proof valve 62 (vent valve);

[0092] 2. Assemble the negative terminal 20, the second insulating member 38, the first cover plate 14, the first insulating member 28, the sealing member 50 and the negative electrode column 32 together by a riveting process;

[0093] 3. Weld the negative electrode current collector 30 and the negative electrode column 32 together to form a top cover assembly;

[0094] 4. Weld the positive electrode current collecting plate 64 and the second cover plate 16 together to form a bottom cover plate assembly;

[0095] 5. The positive electrode sheet, the negative electrode sheet, and the separator are wound to form a core, and the positive and negative ends of the core are made by flattening or stacking, and the core is loaded into the accommodating cavity 26 of the shell 12;

[0096] 6. Weld the positive electrode area of ​​the winding core to the positive electrode current collecting plate 64 on the bottom cover assembly;

[0097] 7. Weld the negative electrode area of ​​the winding core to the negative electrode current collecting plate 30 on the top cover assembly;

[0098] 8. Weld the second cover plate 16 on the bottom cover plate assembly and the first cover plate 14 on the top cover plate assembly to the housing 12 (such as an aluminum housing);

[0099] 9. The electrolyte is injected into the cylindrical battery cell 100 through the injection hole 56. After the injection is completed, the injection hole 56 is welded and sealed.

[0100] In summary, the cylindrical battery cell 100 of the present invention has at least the following technical effects:

[0101] 1. The utilization rate of the axial space of the battery cell is increased, which effectively increases the capacity of the cylindrical battery cell 100 and improves the energy density of the cylindrical battery cell 100;

[0102] 2. The negative electrode current collecting disc 30 is provided with a third through hole 58, so that the electrolyte can penetrate into each position of the winding core, and the infiltration of the electrolyte in the winding core can be accelerated;

[0103] 3. This solution uses the positive and negative terminals to be arranged on the same cover plate. When the module is welded, it can be welded on the positive terminal 18 and the negative terminal 20, avoiding welding on the first cover plate 14, eliminating the risk of welding leakage and reducing safety hazards;

[0104] 4. The positive and negative terminals are led out from the same end of the cylindrical battery cell 100, and there is no need to reserve additional space for the connecting piece, wiring harness assembly, etc. at the other end of the cylindrical battery cell 100, which can improve the module space utilization rate, increase the product volume specific energy by about 15%, reduce the weight by about 7%, and reduce the cost;

[0105] 5. The positive and negative collector plates are welded to improve the rate performance of the cylindrical battery cell 100 and reduce the temperature rise of the cylindrical battery cell 100.

[0106] The product equipped with the cylindrical battery cell 100 of the present invention can meet the requirements of light weight, small volume, CTP (Cell to Pack), CTB (Cell to Body), and CTC (Cell to Chassis).

[0107] An electric device according to an embodiment of the utility model comprises the cylindrical battery core 100 according to any one of the above embodiments.

[0108] In the above-mentioned electrical equipment, the positive terminal 18 and the negative terminal 20 are both arranged on the first cover plate 14, so that the positive terminal 18 and the negative terminal 20 can be arranged on the same side of the cylindrical battery cell 100, thereby increasing the axial space utilization of the cylindrical battery cell 100, effectively improving the capacity of the battery cell, and improving the energy density of the battery cell.

[0109] Specifically, the electrical equipment includes but is not limited to energy storage power supplies, vehicles, drones, etc. The cylindrical battery cell 100 provides electrical energy for the electrical equipment.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0111] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, combinations, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cylindrical battery cell, characterized in that: include: case; A first cover plate, the first cover plate is arranged at one end of the shell along the length direction of the cylindrical battery cell and is sealed and connected to the shell; A second cover plate, the second cover plate is arranged at the other end of the shell along the length direction of the cylindrical battery core and is sealed and connected to the shell; A positive terminal, the positive terminal is disposed on the first cover plate, and the positive terminal is conductively connected to the second cover plate through the first cover plate and the shell; A negative terminal is provided on the first cover plate, and the negative terminal is insulated from the first cover plate.

2. The cylindrical battery cell according to claim 1, characterized in that: The cylindrical battery cell includes a first insulating member, a negative current collector and a negative electrode column. A housing cavity is provided in the shell. The first insulating member and the negative current collector are located in the housing cavity. The negative electrode column passes through the first insulating member and connects the negative current collector and the negative terminal. The first insulating member separates the first cover plate and the negative current collector.

3. The cylindrical battery cell according to claim 2, characterized in that: A first groove is formed on a surface of the first insulating member facing the first cover plate, the positive terminal penetrates the first cover plate, and the bottom of the positive terminal is accommodated in the first groove.

4. The cylindrical battery cell according to claim 2, characterized in that: The cylindrical battery cell includes a second insulating member, which is disposed between the negative terminal and the first cover plate. The negative electrode column passes through the first cover plate and the second insulating member and is connected to the negative terminal.

5. The cylindrical battery cell according to claim 4, characterized in that: A second groove is formed on a surface of the second insulating member facing the negative terminal, and the negative terminal is partially accommodated in the second groove.

6. The cylindrical battery cell according to claim 2, characterized in that: The first insulating member is provided with a first through hole, the first cover plate is provided with a second through hole, the axis of the first through hole coincides with the axis of the second through hole, the aperture of the second through hole is smaller than the aperture of the first through hole, the negative electrode column comprises a negative electrode base and a negative electrode column, the negative electrode base connects the negative electrode column and the negative electrode collector, the cylindrical battery cell comprises a seal, the seal is at least partially located in the first through hole, the negative electrode column passes through the seal and the second through hole and is connected to the negative terminal, the seal seals the negative electrode base and the first cover plate and electrically isolates the negative electrode base and the first cover plate.

7. The cylindrical battery cell according to claim 2, characterized in that: The first cover plate is provided with a liquid injection hole, the liquid injection hole is connected to the accommodating cavity, the negative electrode current collecting plate is provided with a third through hole along the thickness direction, the third through hole is connected to the liquid injection hole and the accommodating cavity.

8. The cylindrical battery cell according to claim 1, characterized in that: The positive electrode terminal and the negative electrode terminal have different shapes and structures.

9. The cylindrical battery cell according to claim 1, characterized in that: The shell is provided with a housing cavity, the cylindrical battery cell includes a positive current collector disk, the positive current collector disk is located in the housing cavity, the second cover plate is connected to the positive current collector disk, and the positive current collector disk is conductively connected to the positive terminal through the second cover plate, the shell and the first cover plate.

10. An electrical device, characterized in that: A cylindrical battery cell comprising any one of claims 1 to 9.

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