Cylindrical battery and battery device

Abstract

The utility model relates to the technical field of batteries, in particular to a cylindrical battery and a battery device, the cylindrical battery comprises a shell and a battery cell, the battery cell is positioned in the shell, the battery cell comprises a roll core body, a positive pole lug and a negative pole lug, and the roll core body is provided with a first end and a second end which are opposite in the axial direction of the cylindrical battery; the positive pole lug and the negative pole lug are both located at the first end, and an insulating part is arranged between the second end and the shell; wherein the insulating part comprises a body part and a lug boss, the lug boss is positioned on one side, facing the battery cell, of the body part and extends towards the battery cell, and the second end is provided with a vacant part. According to the structural design, the positive pole lug and the negative pole lug of the cylindrical battery are led out from the same side, and the shell is electrified, so that insulation between the battery cell and the shell needs to be realized, the convex part of the insulating part can be utilized to realize effective limiting between the insulating part and the battery cell, relative displacement between the insulating part and the battery cell in the radial direction is avoided, and the service life of the battery cell is prolonged. The insulation effect is ensured and the service life of the cell is prolonged.

Description

Technical Field

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

[0002] In the existing design of cylindrical batteries, in order to achieve the insulation performance between the battery cell and the shell, an insulating member is arranged between the two. However, the insulating member and the battery cell are prone to relative displacement, which affects the insulation effect and even causes damage to the insulating member and the battery cell, resulting in insulation failure and shortening the battery cell life. Utility Model Content

[0003] A main purpose of the utility model is to overcome at least one defect of the above-mentioned prior art and provide a cylindrical battery that ensures stable positioning of the battery core and the insulating member.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] According to one aspect of the utility model, a cylindrical battery is provided, which includes a shell and a battery cell, wherein the battery cell is located inside the shell, and the battery cell includes a winding core body, a positive electrode tab and a negative electrode tab, wherein the winding core body has a first end and a second end opposite to each other in the axial direction of the cylindrical battery, the positive electrode tab and the negative electrode tab are both located at the first end, and an insulating member is arranged between the second end and the shell; wherein the insulating member includes a main body and a protruding portion, wherein the protruding portion is located on a side of the main body facing the battery cell and extends toward the battery cell, and the second end has a vacant portion, wherein the protruding portion is at least partially accommodated in the vacant portion.

[0006] It can be seen from the above technical solution that the advantages and positive effects of the cylindrical battery proposed by the utility model are:

[0007] The cylindrical battery proposed in the utility model includes an insulating member arranged between the non-tab lead-out end of the battery cell and the shell, and the insulating member includes a main body and a protruding portion, the protruding portion is located on the side of the main body facing the battery cell and extends toward the battery cell, the non-tab lead-out end has a vacant portion, and the protruding portion is at least partially accommodated in the vacant portion, thereby realizing the radial limiting function of the winding core body and the insulating member. Through the above structural design, since the positive tab and the negative tab of the cylindrical battery are led out on the same side, and the shell is charged, it is necessary to achieve insulation between the battery cell and the shell. The utility model can use the protruding portion of the insulating member to achieve effective limiting of the insulating member and the battery cell, avoid relative displacement between the insulating member and the battery cell in the radial direction, ensure the insulation effect, and extend the life of the battery cell.

[0008] Another main purpose of the present invention is to overcome at least one defect of the above-mentioned prior art and provide a battery device using the above-mentioned cylindrical battery.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] According to another aspect of the present invention, a battery device is provided, which includes the cylindrical battery proposed in the present invention.

[0011] It can be seen from the above technical solutions that the advantages and positive effects of the battery device proposed by the utility model are:

[0012] The battery device proposed by the utility model can ensure the insulation effect of the cylindrical battery and extend the life of the battery cell by adopting the cylindrical battery proposed by the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0014] Figure 1 is a schematic diagram of a three-dimensional structure of a cylindrical battery according to an exemplary embodiment;

[0015] Figure 2 It is a three-dimensional exploded schematic diagram of the battery cell and the insulating parts;

[0016] Figure 3 yes Figure 2 A partial axial cross-sectional view of the combined structure of the battery cell, the insulating member and the housing in the illustrated embodiment;

[0017] Figure 4 is a perspective exploded schematic diagram of a battery cell and an insulating member of a cylindrical battery according to another exemplary embodiment;

[0018] Figure 5 is a schematic diagram of a three-dimensional structure of an insulating member of a cylindrical battery according to another exemplary embodiment;

[0019] Figure 6 yes Figure 5 A partial axial cross-sectional view of the combined structure of the battery cell, the insulating member and the housing in the illustrated embodiment;

[0020] Figure 7 is a partial axial cross-sectional view of a combined structure of a battery cell, an insulating member and a housing according to another exemplary embodiment;

[0021] Figure 8 is a schematic diagram of a three-dimensional structure of an insulating member of a cylindrical battery according to another exemplary embodiment.

[0022] The following are the descriptions of the reference numerals:

[0023] 100. Shell;

[0024] 111. protrusion;

[0025] 200. Roll core body;

[0026] 210. Core hole;

[0027] 220. Second end;

[0028] 300. Insulation parts;

[0029] 310. Ontology part;

[0030] 320. Raised part;

[0031] 321.Through hole;

[0032] 322. Shielding part;

[0033] 330. First adhesive layer;

[0034] 340. Second adhesive layer;

[0035] 400. Insulation layer;

[0036] 410. Fold the edge;

[0037] H1. Height;

[0038] H2.Thickness;

[0039] H3. Height;

[0040] H4. Length;

[0041] X. Axial. DETAILED DESCRIPTION

[0042] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0043] In the following description of different exemplary embodiments of the utility model, reference is made to the accompanying drawings, which form a part of the utility model and in which different exemplary structures, systems and steps that can implement multiple aspects of the utility model are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the utility model. Moreover, although the terms "above", "between", "within", etc. can be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0044] See also Figure 1 , which representatively shows a three-dimensional structural schematic diagram of the cylindrical battery proposed in the utility model. In this exemplary embodiment, the cylindrical battery proposed in the utility model is described by taking a battery device applied to a vehicle as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the utility model to other types of battery devices, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the cylindrical battery proposed in the utility model.

[0045] It should be noted that the battery device proposed in the utility model can be used in various electrical devices, such as mobile phones, portable devices, laptops, various vehicles (such as battery cars, electric cars, etc.), ships, spacecraft, electric toys and electric tools, etc. Further, the above-mentioned spacecraft may include, for example, airplanes, rockets, space shuttles and spacecrafts. The above-mentioned electric toys may include, for example, fixed or mobile electric toys (such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.). The above-mentioned electric tools may include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers. It should be understood that in various possible embodiments that conform to the design concept of the utility model, the cylindrical battery or battery device proposed in the utility model is not limited to the above-described devices, but can also be applied to all devices using batteries. For the sake of simplicity, the various embodiments in this specification are described by taking vehicles as an example.

[0046] like Figure 1 As shown, in one embodiment of the present invention, the cylindrical battery provided by the present invention includes a housing 100 and a battery cell. Figure 2 and Figure 3 , Figure 2 A three-dimensional exploded schematic diagram of a battery cell and an insulating member 300 is representatively shown in FIG. Figure 3 1 is a partial axial cross-sectional view of the combined structure of the battery cell, the insulating member 300 and the housing 100. The structure, connection mode and functional relationship of the main components of the cylindrical battery proposed by the present invention will be described in detail below in conjunction with the above drawings.

[0047] like Figures 1 to 3 As shown, in one embodiment of the utility model, the battery cell is located inside the shell 100, and the battery cell includes a core body 200, a positive electrode tab and a negative electrode tab. The core body 200 has opposite first and second ends 220 in the axial direction X of the cylindrical battery. The positive electrode tab and the negative electrode tab are both located at the first end of the core body 200, that is, the first end is the tab lead-out side of the battery cell, and the second end 220 is the non-tab lead-out side of the battery cell. An insulating member 300 is provided between the second end 220 of the core body 200 and the shell 100, and the insulating member 300 can provide an insulating function between the second end 220 of the core body 200 and the shell 100 at the corresponding position. On this basis, the insulating member 300 includes a main body 310 and a protrusion 320, the protrusion 320 is located on the side of the main body 310 facing the battery cell, and the protrusion 320 extends toward the battery cell, and the second end 220 of the core body 200 has a vacant portion, and the protrusion 320 is at least partially accommodated in the vacant portion. Accordingly, the cylindrical battery is suitable for limiting the relative position of the core body 200 and the insulating member 300 in the radial direction of the cylindrical battery through the cooperation of the protrusion 320 and the vacant portion. Through the above-mentioned structural design, since the positive pole ear and the negative pole ear of the cylindrical battery are led out on the same side, and the shell 100 is charged, it is necessary to achieve insulation between the battery cell and the shell 100. The utility model can use the protrusion 320 of the insulating member 300 to achieve effective limiting of the insulating member 300 and the battery cell, avoid relative displacement between the insulating member 300 and the battery cell in the radial direction, ensure the insulation effect, and extend the life of the battery cell.

[0048] like Figure 3As shown, in one embodiment of the utility model, the core body 200 has a core hole 210 that passes through the axial direction X, and part of the core hole 210 forms the above-mentioned vacant portion. In other words, the protrusion 320 of the insulating member 300 is at least partially accommodated in the channel of the core hole 210. Through the above-mentioned structural design, the utility model can use the protrusion 320 to support the core hole 210 to prevent the core hole 210 from deforming during the processing of the cylindrical battery (such as the injection process or the charge and discharge expansion process). It should be noted that when the vacant portion is formed by part of the core hole 210, the vacant portion is actually part of the channel of the core hole 210. In some embodiments, the vacant portion can also be formed by other structures of the battery cell. For example, the vacant portion can be the gap between adjacent diaphragms of the core body 200 or adjacent diaphragms and pole pieces, and is not limited to this embodiment.

[0049] like Figure 3 As shown, in one embodiment of the present invention, along the axial direction X of the cylindrical battery, the height H1 of the protrusion 320 can be 0.1mm to 3mm, such as 0.1mm, 0.5mm, 1mm, 2mm, 3mm, etc. Through the above structural design, the present invention can avoid the height H1 of the protrusion 320 being too small so that the limiting function is not obvious, and can also avoid the height H1 of the protrusion 320 being too large so that the protrusion 320 easily damages the active material area of ​​the pole piece. Further, when the vacant portion is formed by part of the winding core hole 210, the present invention adopts the above-mentioned suitable height H1 design, which can prevent the protrusion 320 from causing the position of the winding core hole 210 to deform during the injection process through the winding core hole 210 or the battery charging and discharging over-expansion process. In some embodiments, the height H1 of the protrusion 320 can also be less than 0.1mm, or can be greater than 3mm, such as 0.095mm, 3.05mm, etc., and is not limited to this embodiment.

[0050] like Figure 3As shown, in one embodiment of the present invention, along the radial direction of the cylindrical battery, there is a gap between the protrusion 320 and the vacant portion, and the width of the gap can be 0.05mm to 4mm, such as 0.05mm, 0.1mm, 0.5mm, 1mm, 2mm, 4mm, etc. It should be noted that, taking the example that the cross section of the protrusion 320 is circular and the vacant portion is formed by the winding core hole 210 in the form of a circular hole, the width of the above-mentioned gap is half of the difference between the inner diameter of the vacant portion (such as the aperture of the winding core hole 210) and the outer diameter of the protrusion 320. Through the above-mentioned structural design, the present invention can avoid the width of the gap between the protrusion 320 and the vacant portion being too large so that the insulating member 300 is easily displaced, and can also avoid the width of the gap being too small so that the protrusion 320 is easy to squeeze the pole piece, causing the pole piece to fall off and the diaphragm or pole piece to be damaged. In addition, maintaining a certain gap between the protrusion 320 and the vacant portion can also facilitate assembly. Furthermore, when the vacant portion is formed by part of the winding core hole 210, a diaphragm is disposed at the position of the winding core hole 210, and a pole piece active material layer is disposed outside the diaphragm. If the protrusion 320 and the hole wall of the winding core hole 210 are too close, the diaphragm will be squeezed, resulting in an increased risk of pole piece falling. In some embodiments, the width of the above gap may also be less than 0.05 mm, or may be greater than 4 mm, such as 0.049 mm, 4.05 mm, etc., and is not limited to this embodiment.

[0051] like Figure 3 As shown, in one embodiment of the present invention, along the axial direction X of the cylindrical battery, the thickness H2 of the main body 310 can be 0.03mm to 0.5mm, such as 0.03mm, 0.05mm, 0.1mm, 0.2mm, 0.5mm, etc. Through the above structural design, the present invention can avoid the excessive occupation of the internal space of the shell 100 caused by the excessive thickness H2 of the main body 310, and can also avoid the thickness H2 of the main body 310 being too small to affect the insulation effect. In some embodiments, the thickness H2 of the main body 310 can also be less than 0.03mm, or can be greater than 0.5mm, such as 0.029mm, 0.51mm, etc., and is not limited to this embodiment.

[0052] In one embodiment of the present invention, the ratio of the area of ​​the side surface of the main body 310 facing the battery cell to the end surface area of ​​the second end 220 can be 1:2 to 3:2, for example, 1:2, 2:3, 3:4, 1:1, 5:4, 3:2, etc. Through the above structural design, the present invention can avoid the area of ​​the main body 310 being too small, which increases the risk of short circuit between the battery cell and the housing 100, and can also avoid the area of ​​the main body 310 being too large, which increases the weight of the insulating member and affects the heat dissipation of the battery cell. In some embodiments, the ratio of the area of ​​the side surface of the main body 310 facing the battery cell to the end surface area of ​​the second end 220 can also be less than 1:2, or can be greater than 3:2, for example, 9:20, 31:20, etc., and is not limited to this embodiment.

[0053] In one embodiment of the present invention, a reference plane is defined, which is parallel to the surface of the main body 310 facing the battery cell. On the reference plane, the orthographic projection figure of the main body 310 and the orthographic projection figure of the protrusion 320 can both be circular, and the center of the corresponding circle of the orthographic projection figure of the main body 310 coincides with the center of the corresponding circle of the orthographic projection figure of the protrusion 320. Through the above structural design, the present invention can make the protrusion 320 match the core hole 210 with a circular cross section, facilitate the cooperation between the protrusion 320 and the core hole 210, and improve the positioning accuracy between the insulating member 300 and the battery cell. In some embodiments, the orthographic projection figure of the protrusion 320 on the above reference plane can also be other shapes, such as polygons, ellipses, etc. In addition, the orthographic projection figures of the main body 310 and the protrusion 320 are not limited to the same, and the geometric center of the orthographic projection figure of the main body 310 and the geometric center of the orthographic projection figure of the protrusion 320 can preferably coincide, which is not limited to this embodiment. It should be noted that the above-mentioned geometric center refers to the centralmost position of the orthographic projection figure of the main body 310 or the protrusion 320, such as the center of a circle, the center of the corresponding circle of a regular polygon, the intersection of two diagonals of a parallelogram, etc.

[0054] Based on the structural design that the orthographic projection of the protrusion 320 is a circle, in one embodiment of the present invention, the outer diameter of the end of the protrusion 320 connected to the main body 310 can be larger than the outer diameter of the end of the protrusion 320 away from the main body 310. For example, the axial cross-section of the protrusion 320 can be roughly trapezoidal. Through the above structural design, the present invention can use the side of the protrusion 320 to provide a guiding effect, so that the protrusion 320 is easier to enter the vacant part, further facilitating the assembly of the insulating member 300. In some embodiments (for example Figure 3In the embodiment shown in the figure, the outer diameter of the end of the protrusion 320 connected to the main body 310 may also be equal to the outer diameter of the end of the protrusion 320 away from the main body 310, and this embodiment is not limited thereto. It should be noted that in this embodiment, the orthographic projection figures of both ends of the protrusion 320 in the first direction are both circular as an example for explanation. In some embodiments, the orthographic projection figures of both ends of the protrusion 320 may also be other shapes and are not limited to the same shape. In this case, the width of one end of the protrusion 320 connected to the main body 310 may be greater than the width of the other end. The so-called width is, for example, the outer diameter of a circle, the length of the major axis of an ellipse, the outer diameter of the corresponding circle of a regular polygon, the length of the longer of the two diagonals of a parallelogram, etc.

[0055] In one embodiment of the present invention, the winding core body 200 includes a diaphragm, and the ratio of the hardness of the insulating member 300 to the overhang of the diaphragm can be 2 to 110, for example, 2, 5, 10, 20, 50, 100, 110, etc. Among them, the overhang of the diaphragm refers to the width of the edge of the diaphragm exceeding the edge of the negative electrode plate in the length and / or width direction. Through the above-mentioned structural design, the utility model comprehensively designs the relationship between the hardness of the insulating member 300 and the overhang of the diaphragm. By making the insulating member 300 have a certain hardness, it plays a role in supporting the vacant part, so that the diaphragm will not be sucked up by the negative pressure during the liquid injection process and affect the liquid injection. At the same time, the overhang size of the diaphragm can be larger to ensure the insulation between the positive and negative electrode plates. In particular, when the vacant portion is formed at the position of the winding core hole 210, the protrusion 320 is partially accommodated in the winding core hole 210, playing a role in fully supporting the winding core hole 210 and preventing the winding core hole 210 from being easily crushed and deformed during the battery cell expansion process or the liquid injection process.

[0056] In one embodiment of the present invention, the hardness of the insulating member 300 can be 10HV to 100HV, such as 10HV, 20HV, 50HV, 100HV, etc. Among them, the method for measuring the hardness of the insulating member 300 can refer to the national standard GB / T 4340.1-2009. Through the above design, the present invention can avoid the hardness of the insulating member 300 being too small to play a supporting role for the core hole 210, resulting in the core hole 210 being easily crushed and deformed during the expansion of the battery cell or the injection process. At the same time, the present invention can avoid the hardness of the insulating member 300 being too high. Since the protrusion 320 is in direct contact with the inner diaphragm of the core body 200, when the hardness of the insulating member 300 is too high, it will be more likely to cause damage to the diaphragm, thereby causing the pole piece to be exposed and increasing the risk of short circuit. In some embodiments, the hardness of the insulating member 300 may be less than 10 HV, or may be greater than 100 HV, such as 9.5 HV, 101 HV, etc., and is not limited to this embodiment.

[0057] In one embodiment of the utility model, the overhang of the diaphragm can be 1mm to 4mm, for example, 1mm, 2mm, 3mm, 4mm, etc. Through the above structural design, since the insulating member 300 adopts the above preferred design, it is ensured that the insulating member 300 has sufficient hardness, so that the structural design of the diaphragm with a larger overhang can be achieved, thereby ensuring the insulation performance between the positive electrode sheet and the negative electrode sheet. Further, when the protrusion 320 is at least partially accommodated in the winding core hole 210, since the insulating member 300 has a greater hardness, the protrusion 320 of the insulating member 300 can play a role in fully supporting the winding core hole 210, even if the size of the diaphragm is relatively large, the diaphragm will not be pulled out and block the injection channel due to negative pressure adsorption during the injection process. In addition, the utility model can fully ensure the insulation of the positive and negative electrode sheets by using the diaphragm by designing the overhang of the diaphragm to a suitable range.

[0058] In one embodiment of the present invention, the surface roughness Rz of the insulating part 300 may be less than or equal to 0.3, such as 0.1, 0.15, 0.2, 0.3, etc. Among them, the measurement method of the surface roughness Rz of the insulating part 300 can refer to the national standard GB / T 3505-2000. Through the above design, the utility model can avoid the surface roughness Rz of the insulating part 300 being too large, which may easily scratch the diaphragm. In addition, compared with the surface roughness Ra, the surface roughness Rz is more sensitive to the characterization of abnormal conditions such as burrs, so it is more valuable for reference to the selection of surface processing parameters for the insulating part 300. In some embodiments, the surface roughness Rz of the insulating part 300 may also be greater than 0.3, such as 0.31, etc., and is not limited to this embodiment.

[0059] In one embodiment of the present invention, the thermal conductivity of the insulating member 300 can be 0.01W / (m·k) to 5W / (m·k), such as 0.01W / (m·k), 0.1W / (m·k), 0.5W / (m·k), 1W / (m·k), 2W / (m·k), 5W / (m·k), etc. Among them, the measurement method of the thermal conductivity of the insulating member 300 can refer to the national standard GB / T 10297-2015. Through the above design, the present invention can control the thermal conductivity of the insulating member 300 within a relatively low range. Accordingly, since the shell 100 is charged, the shell 100 of the cylindrical battery has a high heat during the charging and discharging process. The present invention can use the insulating member 300 to play a heat insulation role, avoid excessive heat transfer from the shell 100 to the diaphragm of the winding core body 200, avoid the problem of the diaphragm being easily contracted due to heat and causing the pole piece to be exposed, and reduce the risk of short circuit. At the same time, the utility model can avoid the problem that the thermal conductivity of the insulating member 300 is too low and the battery core cannot dissipate heat through the housing 100. In some embodiments, the thermal conductivity of the insulating member 300 can also be greater than 5W / (m·k), such as 5.01W / (m·k), etc., and is not limited to this embodiment.

[0060] In one embodiment of the present invention, the insulating member 300 is fixedly connected to at least one of the core body 200 and the shell 100. For example, the insulating member 300 can be fixedly connected to the core body 200, and has no fixed connection relationship with the shell 100. For another example, the insulating member 300 can be fixedly connected to the shell 100, and has no fixed connection relationship with the core body 200. For another example, the insulating member 300 can be fixedly connected to the shell 100 and the core body 200, respectively. Furthermore, the insulating member 300 can be fixedly connected to at least one of the core body 200 and the shell 100 by, for example, welding, hot melt fixing, bonding, etc. Through the above-mentioned structural design, the utility model can ensure that the position of the insulating member 300 is relatively fixed, and ensure the insulation effect between the battery cell and the shell 100.

[0061] In some embodiments of the present invention, the insulating member 300 and the housing 100 may also be designed as an integral molding. The so-called integral molding can be understood as the insulating member 300 is integrated on the housing 100 when the housing 100 is supplied. Through the above structural design, the present invention can directly ensure that the center of the housing 100 and the center of the insulating member 300 are arranged concentrically by means of integral molding, without the need for additional positioning, reducing assembly processes, improving production efficiency, facilitating the matching positioning of the housing 100 and the center of the battery cell, and having a high positioning accuracy.

[0062] In some embodiments of the present invention, when the insulating member 300 and the shell 100 are integrally formed, the thickness H2 of the main body 310 along the axial direction X of the cylindrical battery can be 0.05mm to 0.5mm, such as 0.05mm, 0.07mm, 0.1mm, 0.2mm, 0.5mm, etc. Through the above structural design, since the gap between the shell 100 and the insulating member 300 is small when the insulating member 300 and the shell 100 are integrally formed, the thickness H2 of the main body 310 is further limited to not limited to 0.05mm, which can avoid the problem of poor electrolyte infiltration effect. In addition, since the insulating member 300 and the shell 100 are integrally formed, the gap between the insulating member 300 and the shell 100 is often relatively small, which in turn causes the creepage distance between the battery cell and the shell 100 to become smaller. The present invention designs the main body 310 of the insulating member 300 to be a certain thickness, which can reduce the insulation risk between the battery cell and the shell 100. At the same time, the main body 310 of the insulating member 300 cannot be too thick, because after the electrolyte is injected, it will be temporarily stored at the bottom of the shell 100. If the main body 310 is too thick, it will affect the subsequent electrolyte infiltration of the electrode.

[0063] like Figure 3 As shown, based on the structural design of the fixed connection between the insulating member 300 and the core body 200, in one embodiment of the present invention, a part of the protrusion 320 can be connected to the core body 200 via the first adhesive layer 330, that is, the insulating member 300 and the core body 200 are fixedly connected by bonding. In some embodiments, the side of the main body 310 close to the battery cell can also be bonded to the core body 200.

[0064] like Figure 3 As shown, based on the structural design of the fixed connection between the insulating member 300 and the shell 100, in one embodiment of the utility model, the surface of the side of the main body 310 facing away from the battery cell can be connected to the shell 100 via the second adhesive layer 340, that is, the fixed connection method between the insulating member 300 and the shell 100 is bonding.

[0065] See also Figure 4 , Figure 4 1 represents a three-dimensional exploded schematic diagram of a battery cell and an insulating member 300 of a cylindrical battery in accordance with the principle of the present invention in another exemplary embodiment.

[0066] like Figure 4 As shown, in one embodiment of the present invention, the battery cell may further include an insulating layer 400, which is disposed on the side of the battery cell (e.g., the cylindrical surface of the battery cell). On this basis, the edge of the insulating layer 400 adjacent to the second end 220 of the winding core body 200 may have a folded edge 410, and the folded edge 410 covers a portion of the end surface of the second end 220. In order to facilitate observation and understanding, Figure 4The dot-shaped filling pattern is used to represent the portion of the insulating layer 400. Through the above structural design, the utility model can use the insulating layer 400 to improve the insulation effect between the battery cell and the housing 100.

[0067] like Figure 4 As shown, based on the structural design that the battery cell includes an insulating layer 400 and the insulating layer 400 has a folded edge 410, in one embodiment of the present utility model, a reference plane is defined, which is parallel to the surface of the main body 310 facing the battery cell. On the reference plane, the orthographic projection pattern of the insulating member 300 partially overlaps with the orthographic projection pattern of the insulating layer 400. In order to facilitate observation and understanding, Figure 4 In the figure, the insulating member 300 is separated from the battery cell in the circumferential direction, and a dotted line is marked on the folded edge 410, which indicates the edge position of the insulating member 300 when the battery cell is installed, so as to help understand the overlapping relationship between the insulating member 300 and the insulating layer 400 (folded edge 410). Through the above structural design, the utility model can further ensure the insulation effect of the overlapping part of the insulating member 300 and the insulating layer 400, and avoid the gap between the insulating member 300 and the folded edge 410 to affect the insulation performance.

[0068] Based on the structural design that the insulating member 300 and the insulating layer 400 (the folded edge 410) partially overlap, in one embodiment of the present invention, the insulating member 300 and the insulating layer 400 can be fixedly connected, for example, the edge of the main body 310 of the insulating member 300 is fixedly connected to the folded edge 410. Through the above structural design, the present invention can use the insulating layer 400 to fix the insulating member 300, thereby avoiding the insulating member and the battery cell from being bonded and damaging the battery cell.

[0069] Based on the structural design of partial overlap between the insulating member 300 and the insulating layer 400 (the folded edge 410), in one embodiment of the present invention, on any straight line path parallel to the radial direction on the above reference plane, the length of the overlapping portion of the orthographic projection of the insulating member 300 and the insulating layer 400 can be less than or equal to 15 mm, such as 1 mm, 2 mm, 5 mm, 10 mm, 15 mm, etc. Among them, the length of the above overlapping portion can be understood as Figure 4 The width of the ring defined by the dotted line in the figure and the solid line representing the inner edge of the folded edge 410. Through the above structural design, the utility model can prevent the overlapping area between the insulating member 300 and the insulating layer 400 from being too large and occupying the shell space. In addition, when the overlapping area is too large, the size of the folded edge 410 of the insulating layer 400 is large, which will increase the risk of wrinkling of the insulating layer 400, resulting in poor end surface flatness of the second end of the cylindrical battery. In some embodiments, the length of the overlapping portion of the orthographic projection pattern of the insulating member 300 and the insulating layer 400 may also be greater than 15 mm, such as 15.1 mm, etc., and is not limited to this embodiment.

[0070] Based on the structural design of the battery cell including the insulating layer 400, in one embodiment of the present invention, the insulating layer 400 may be an insulating film. In some embodiments, the insulating layer 400 may also be arranged in other ways, for example, the insulating layer 400 may be an insulating coating formed by spraying, which is not limited to this embodiment.

[0071] See also Figure 5 and Figure 6 , Figure 5 : A three-dimensional structural schematic diagram of an insulating member 300 of a cylindrical battery in accordance with the principle of the present utility model in another exemplary embodiment is representatively shown; Figure 6 A partial axial cross-sectional view of the combined structure of the battery cell, the insulating member 300 and the housing 100 is representatively shown in FIG.

[0072] like Figure 5 and Figure 6 As shown, in one embodiment of the present invention, the cylindrical battery proposed by the present invention includes a liquid injection hole structure, which is arranged on the side of the shell 100 close to the insulating member 300. On this basis, the protrusion 320 of the insulating member 300 can be provided with a through hole 321, and the through hole 321 passes through the insulating member 300 along the axial direction X, and the channel of the liquid injection hole structure is arranged at least partially overlapping with the through hole 321. Through the above-mentioned structural design, the utility model can facilitate the liquid injection operation of the cylindrical battery, avoid the diaphragm blocking the winding core hole 210 or the liquid injection hole, and ensure the liquid injection effect. Among them, the liquid injection hole of the cylindrical battery and the winding core hole 210 of the battery cell are arranged relative to each other. During the liquid injection process, negative pressure will be drawn, causing the diaphragm of the battery cell to be easily pulled out, causing the diaphragm to block the winding core hole 210 or the liquid injection hole, affecting the battery injection. In this regard, the utility model can use the design of the protrusion 320 being located at the position of the winding core hole 210 to support the winding core hole 210 and ensure the liquid injection efficiency.

[0073] See also Figure 7 , Figure 7 1 represents a partial axial cross-sectional view of a combined structure of a battery cell, an insulating member 300 and a housing 100 of a cylindrical battery in accordance with the principles of the present invention in another exemplary embodiment.

[0074] like Figure 7As shown, still taking the structural design that the housing 100 is provided with a liquid injection hole structure and the protrusion 320 is provided with a through hole 321 as an example, in one embodiment of the utility model, the liquid injection hole structure includes a protrusion 111 extending toward the battery cell, and the protrusion 111 is at least partially accommodated in the through hole 321. For example, the channel of the liquid injection hole structure can be located in the protrusion 111. On this basis, along the axial direction X of the cylindrical battery, the ratio of the length H4 of the through hole 321 to the height H3 of the protrusion 111 can be 1:3 to 3:2, for example, 1:3, 1:2, 2:3, 3:4, 1:1, 5:4, 3:2, etc. Among them, since the through hole 321 passes through the protrusion 320 in the axial direction X, and also passes through the main body 310, the length H4 of the through hole 321 can be understood as the sum of the thickness of the main body 310 and the height of the protrusion 320. Through the above structural design, the utility model can avoid the above ratio being too small to affect the insulation performance between the injection hole structure and the battery core, and can also avoid the above ratio being too large to increase the difficulty of assembly. In some embodiments, the ratio of the length H4 of the through hole 321 to the height H3 of the protrusion 111 can also be less than 1:3, or can be greater than 3:2, such as 2:9, 14:9, etc., and is not limited to this embodiment.

[0075] See also Figure 8 , Figure 8 The three-dimensional structure diagram of the insulating member 300 in another exemplary embodiment of a cylindrical battery in accordance with the principle of the present invention is representatively shown.

[0076] like Figure 8 As shown, still taking the structural design of the protrusion 320 provided with the through hole 321 as an example, in one embodiment of the utility model, the protrusion 320 may also be provided with a shielding portion 322, the shielding portion 322 is located at the side opening of the through hole 321 close to the battery cell, and the shielding portion 322 is suitable for dividing the opening into at least two through areas. For example, Figure 8 The shielding portion 322 shown is roughly in the shape of a "cross", thereby dividing the opening of the through hole 321 on one side close to the battery core into four through areas. Through the above structural design, the utility model can use the shielding portion 322 to disperse the flow path of the electrolyte during the injection process, avoid the excessive impact force generated when the electrolyte is injected to directly wash the pole piece, and avoid causing damage to the pole piece. In addition, the shielding portion 322 can also strengthen the structural strength of the protrusion 320. In some embodiments, the shielding portion 322 can also be in other shapes, such as but not limited to the "one" shape, etc., and is not limited to this embodiment.

[0077] Based on the structural design that the convex part 320 is provided with the shielding part 322, in one embodiment of the present utility model, a reference plane is defined, which is parallel to the side surface of the main body 310 facing the battery core. On the reference plane, the ratio of the area of ​​the orthographic projection figure of the shielding part 322 to the sum of the projection areas of all the through-regions can be 1:10 to 1:2, such as 1:10, 1:8, 1:5, 1:3, 1:2, etc. Through the above structural design, the present utility model can avoid the shielding part 322 being too large and excessively affecting the injection efficiency, and can also avoid the shielding part 322 being too small and making the effect of strengthening the structural strength of the convex part 320 not obvious. In some embodiments, the ratio of the area of ​​the orthographic projection figure of the shielding part 322 to the sum of the projection areas of all the through-regions can also be less than 1:10, or can be greater than 1:2, such as 1:11, 6:11, etc., and is not limited to this embodiment.

[0078] In one embodiment of the utility model, an electrode lead-out portion is provided on one side of the shell 100 close to the first end of the winding core body 200, one of the positive electrode tab and the negative electrode tab of the battery cell is connected to the electrode lead-out portion, and the other of the positive electrode tab and the negative electrode tab is connected to the shell 100.

[0079] Based on the structural design that the shell 100 is provided with an electrode lead-out portion, in one embodiment of the utility model, a pressure relief portion may also be provided on one side of the shell 100 close to the second end of the core body 200, and the pressure relief portion is located on the radially opposite side to the electrode lead-out portion. Through the above-mentioned structural design, the utility model can achieve electrical and thermal separation, that is, to achieve the separation of the electrical connection path and the heat dissipation channel of the cylindrical battery, thereby avoiding the influence of heat dissipation on the electrical connection. In addition, when the insulating member 300 is provided with a through hole 321, the insulating member 300 can use the through hole to further enhance its own heat dissipation effect on the battery cell, which is beneficial to the rapid transfer of heat generated inside the battery cell to the pressure relief portion of the shell 100, and facilitates the heat dissipation of the cylindrical battery when thermal runaway occurs.

[0080] Based on the structural design that the shell 100 is provided with an electrode lead-out portion, in one embodiment of the utility model, one of the positive electrode tab and the negative electrode tab is connected to the electrode lead-out portion via a current collecting component, and the other of the positive electrode tab and the negative electrode tab is connected to the shell 100 via another current collecting component.

[0081] It should be noted that the cylindrical batteries shown in the drawings and described in this specification are only a few examples of many types of cylindrical batteries that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the cylindrical batteries shown in the drawings or described in this specification.

[0082] In summary, the cylindrical battery proposed in the present invention includes an insulating member 300 disposed between the non-tab lead-out end of the battery cell and the shell 100, and the insulating member 300 includes a main body 310 and a protrusion 320, the protrusion 320 is located on the side of the main body 310 facing the battery cell and extends toward the battery cell, the non-tab lead-out end has a vacant portion, and the protrusion 320 is at least partially accommodated in the vacant portion, thereby realizing the radial limiting function of the winding core body 200 and the insulating member 300. Through the above-mentioned structural design, since the positive tab and the negative tab of the cylindrical battery are led out on the same side, and the shell 100 is charged, it is necessary to achieve insulation between the battery cell and the shell 100. The present invention can use the protrusion 320 of the insulating member 300 to achieve effective limiting of the insulating member 300 and the battery cell, avoid relative displacement between the insulating member 300 and the battery cell in the radial direction, ensure the insulation effect, and extend the life of the battery cell.

[0083] Based on the above detailed description of several exemplary embodiments of the cylindrical battery proposed in the present invention, an exemplary embodiment of the battery device proposed in the present invention will be described below.

[0084] In one embodiment of the present invention, the battery device provided by the present invention includes the cylindrical battery provided by the present invention and described in detail in the above embodiments.

[0085] It should be noted that the battery devices shown in the drawings and described in this specification are only a few examples of many battery devices that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the battery devices shown in the drawings or described in this specification.

[0086] In summary, the battery device proposed in the present invention can ensure the insulation effect of the cylindrical battery and extend the life of the battery cell by adopting the cylindrical battery proposed in the present invention.

[0087] The above describes and / or illustrates in detail exemplary embodiments of cylindrical batteries and battery devices proposed by the utility model. However, the embodiments of the utility model are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described herein. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to indicate the meaning of open inclusion and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as marks and are not numerical restrictions on their objects.

[0088] Although the cylindrical battery and battery device proposed by the present invention have been described according to different specific embodiments, those skilled in the art will recognize that the implementation of the present invention can be modified within the spirit and scope of the claims.

Claims

1. A cylindrical battery, characterized in that: It includes a shell and a battery cell, the battery cell is located inside the shell, the battery cell includes a winding core body, a positive electrode tab and a negative electrode tab, the winding core body has a first end and a second end opposite to each other in the axial direction of the cylindrical battery, the positive electrode tab and the negative electrode tab are both located at the first end, and an insulating member is arranged between the second end and the shell; wherein the insulating member includes a main body and a protruding portion, the protruding portion is located on a side of the main body facing the battery cell and extends toward the battery cell, the second end has a vacant portion, and the convex portion is at least partially accommodated in the vacant portion.

2. The cylindrical battery according to claim 1, characterized in that: The winding core body has a winding core hole penetrating along the axial direction, a portion of the winding core hole forms the vacant portion, and the protrusion is at least partially accommodated in the winding core hole.

3. The cylindrical battery according to claim 1 or 2, characterized in that: Along the axial direction, the height of the protrusion is 0.1 mm to 3 mm; and / or Along the radial direction of the cylindrical battery, there is a gap between the protrusion and the vacant portion, and the width of the gap is 0.05 mm to 4 mm; and / or Along the axial direction, the thickness of the main body is 0.03 mm to 0.5 mm; and / or The ratio of the area of ​​the surface of the main body facing the battery core to the end surface area of ​​the second end is 1:2 to 3:

2.

4. The cylindrical battery according to claim 1 or 2, characterized in that: A reference plane is defined, wherein the reference plane is parallel to a surface of the main body facing the battery cell, wherein at least one of the orthographic projection of the main body and the orthographic projection of the protruding portion is circular, and the geometric center of the orthographic projection of the main body coincides with the geometric center of the protruding portion.

5. The cylindrical battery according to claim 4, characterized in that: The width of the end of the protrusion connected to the main body is greater than the width of the end of the protrusion away from the main body.

6. The cylindrical battery according to claim 1 or 2, characterized in that: The winding core body includes a diaphragm, and the ratio of the hardness of the insulating member to the overhang of the diaphragm is 2-110.

7. The cylindrical battery according to claim 6, characterized in that: The hardness of the insulating member is 10HV to 100HV; and / or The overhang of the diaphragm is 1 mm to 4 mm.

8. The cylindrical battery according to claim 1, characterized in that: The surface roughness Rz of the insulating member is less than or equal to 0.3; and / or The thermal conductivity of the insulating member is 0.01W / (m·k) to 5W / (m·k).

9. The cylindrical battery according to claim 1, characterized in that: The insulating member is fixedly connected to at least one of the winding core body and the shell.

10. The cylindrical battery according to claim 9, characterized in that: A partial area of ​​the protrusion is connected to the winding core body via a first adhesive layer; and / or A surface of the main body facing away from the battery core is connected to the shell via a second adhesive layer.

11. The cylindrical battery according to claim 1 or 2, characterized in that: The insulating member is integrally formed with the shell, and the thickness of the main body along the axial direction is 0.05 mm to 0.5 mm.

12. The cylindrical battery according to claim 1, characterized in that: The battery core further comprises an insulating layer, and the insulating layer is arranged on a side surface of the battery core; wherein the edge of the insulating layer adjacent to the second end has a folded edge, and the folded edge covers a portion of the end surface of the second end.

13. The cylindrical battery according to claim 12, characterized in that: A reference plane is defined, the reference plane being parallel to a side surface of the main body facing the battery core, and on the reference plane, an orthographic projection pattern of the insulating member partially overlaps with an orthographic projection pattern of the insulating layer.

14. The cylindrical battery according to claim 13, characterized in that: On any straight line path on the reference plane parallel to the radial direction of the cylindrical battery, the length of the overlapping portion of the orthographic projection pattern of the insulating member and the insulating layer is less than or equal to 15 mm.

15. The cylindrical battery according to claim 2, characterized in that: It also includes an injection hole structure, which is arranged on a side of the shell close to the insulating member; wherein the protrusion is provided with a through hole that penetrates the insulating member along the axial direction, and the channel of the injection hole structure is at least partially overlapped with the through hole.

16. The cylindrical battery according to claim 15, characterized in that: The injection hole structure includes a protrusion extending toward the battery core, and the protrusion is at least partially accommodated in the through hole; wherein, along the axial direction, the ratio of the length of the through hole to the height of the protrusion is 1:3 to 3:

2.

17. The cylindrical battery according to claim 15, characterized in that: The raised portion is provided with a shielding portion, the shielding portion is located at a side opening of the through hole close to the battery core, and the shielding portion is suitable for dividing the opening into at least two through areas.

18. The cylindrical battery according to claim 17, characterized in that: A reference plane is defined, the reference plane being parallel to a surface of the main body facing the battery core, and on the reference plane, a ratio of an area of ​​a positive projection figure of the shielding portion to a sum of projection areas of all the through regions is 1:10 to 1:

2.

19. The cylindrical battery according to claim 1 or 15, characterized in that: An electrode lead-out portion is provided on one side of the shell near the first end, one of the positive electrode tab and the negative electrode tab is connected to the electrode lead-out portion, and the other is connected to the shell; wherein: A pressure relief portion is further provided on one side of the shell close to the second end, and the pressure relief portion is located on the side opposite to the electrode lead-out portion in the radial direction of the cylindrical battery; and / or One of the positive electrode tab and the negative electrode tab is connected to the electrode lead-out portion via a current collecting member, and the other of the positive electrode tab and the negative electrode tab is connected to the housing via another current collecting member.

20. A battery device, characterized in that: A cylindrical battery comprising any one of claims 1 to 19.

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