Battery

Abstract

This disclosure relates to the field of battery technology and discloses a battery. The battery includes a battery casing, a battery cell, an insulating film, and an insulating component. The battery cell is disposed inside the battery casing. The insulating film covers the outer side surface of the battery cell to insulate and isolate the battery casing from the battery cell, and the outer side surface is parallel to the lead-out direction of the electrode tabs. The insulating component is disposed at least at one end of the battery cell and includes a body portion and a limiting portion. The limiting portion is connected to the side of the body portion near the battery cell and fixed to the side of the insulating film away from the battery cell. In this battery, the insulating film will not peel off from the battery cell, ensuring the insulation effect between the battery cell and the battery casing.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and more specifically, to a battery. Background Technology

[0002] Lithium-ion batteries, as a new type of rechargeable battery, have advantages such as high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and environmental friendliness. They have broad application prospects in portable electrical appliances, power tools, large-scale energy storage, and electric transportation power supplies.

[0003] However, the insulation between the battery cell and the battery casing is currently prone to failure.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to overcome the shortcomings of the above-mentioned related technologies, such as the easy insulation failure between the cell and the battery casing, and to provide a battery in which the insulation failure between the cell and the battery casing is not easy.

[0006] According to one aspect of this disclosure, a battery is provided, comprising:

[0007] Battery casing;

[0008] The battery cell is located inside the battery casing;

[0009] An insulating film is wrapped around the outer side surface of the battery cell to insulate and isolate the battery casing from the battery cell. The outer side surface is parallel to the direction of the tab lead-out.

[0010] An insulating element is provided at least at one end of the battery cell. The insulating element includes a body portion and a limiting portion. The limiting portion is connected to the side of the body portion near the battery cell and fixed to the side of the insulating film away from the battery cell.

[0011] The battery disclosed herein has, on the one hand, an insulating film covering the outer surface of the battery cell, which can insulate and isolate the battery cell from the battery casing; on the other hand, the insulating component includes a body portion and a limiting portion, the limiting portion being connected to the side of the body portion near the battery cell, and the limiting portion being fixed to the side of the insulating film away from the battery cell. The limiting portion can fix the insulating film, so even if the adhesive between the insulating film and the battery cell fails, causing the insulating film to separate from the battery cell, the insulating film will not peel off from the battery cell, thus ensuring the insulation effect between the battery cell and the battery casing.

[0012] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0014] Figure 1 This is a schematic diagram of an example embodiment of the battery disclosed herein.

[0015] Figure 2 for Figure 1 A magnified view of the portion indicated by H in the middle.

[0016] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the battery after the battery casing has been removed.

[0017] Figure 4 for Figure 3 A three-dimensional structural diagram of the insulating component.

[0018] Figure 5 for Figure 3 A three-dimensional structural diagram of the first current collector in the process.

[0019] Figure 6 for Figure 3 A three-dimensional structural diagram of the second current collector in the circuit.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Battery casing; 11. Top surface; 12. Bottom surface; 13. Side surface;

[0022] 2. Battery cells;

[0023] 3. Insulating film; 31. Interface section;

[0024] 4. Insulating component; 41. Body part; 411. First through hole; 412. Second through hole; 413. Insulating ring; 414. Separating baffle; 4141. First part; 4142. Second part; 4143. Third part; 415. Positioning part; 42. Limiting part; 43. Guide structure; 44. Protrusion;

[0025] 5. First collector; 51. First collector section; 52. Second collector section; 53. Recessed section;

[0026] 6. Second collector; 61. Collector ring; 62. Collector cylinder; 63. Collector plate;

[0027] 7. Battery terminals;

[0028] Z, direction of electrode lead-out. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0030] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0031] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0032] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0033] This disclosure provides an exemplary embodiment of a battery, with reference to... Figures 1-6As shown, the battery may include a battery casing 1, a battery cell 2, an insulating film 3, and an insulating component 4; the battery cell 2 is disposed inside the battery casing 1; the insulating film 3 covers the outer side surface of the battery cell 2 to insulate and isolate the battery casing 1 from the battery cell 2, and the outer side surface is parallel to the tab lead-out direction Z; the insulating component 4 is disposed at least at one end of the battery cell 2, and the insulating component 4 includes a body part 41 and a limiting part 42, the limiting part 42 is connected to the side of the body part 41 near the battery cell 2, and the limiting part 42 is fixed to the side of the insulating film 3 away from the battery cell 2.

[0034] In the battery disclosed herein, on the one hand, an insulating film 3 covers the outer side surface of the cell 2, which can insulate and isolate the cell 2 from the battery casing 1; on the other hand, the insulating member 4 includes a body part 41 and a limiting part 42. The limiting part 42 is connected to the side of the body part 41 near the cell 2 and fixed to the side of the insulating film 3 away from the cell 2. The limiting part 42 can fix the insulating film 3, so that even if the adhesive between the insulating film 3 and the cell 2 fails, causing the insulating film 3 to separate from the cell 2, the insulating film 3 will not peel off from the cell 2, thus ensuring the insulation effect between the cell 2 and the battery casing 1.

[0035] In this example implementation, refer to Figure 1 As shown, the battery can be a cylindrical battery; therefore, the battery casing 1 can be cylindrical. Specifically, the battery casing 1 may include a top surface 11 and a bottom surface 12 disposed opposite to each other, both of which are circular. A side surface 13 connects the top surface 11 and the bottom surface 12, and the side surface 13 is cylindrical. The side surface 13, the top surface 11, and the bottom surface 12 surround and form a housing cavity for the battery.

[0036] Of course, in other exemplary embodiments of this disclosure, the bottom surface 12 and the top surface 11 can be rectangular, elliptical, trapezoidal, etc., and the side surface 13 can be one or more, forming a rectangle, ellipse, trapezoid, etc., so that the battery casing 1 is formed as a cuboid, elliptical prism, etc. The battery casing 1 can also be other shapes, which will not be described in detail here.

[0037] In this example embodiment, a battery cell 2 is disposed within the receiving cavity of the battery casing 1. The battery cell 2 can be configured as a cylinder adapted to the battery casing 1. The outer side surface of the battery cell 2 is the side opposite to the side surface 13 of the battery casing 1, and the outer side surface of the battery cell 2 is a cylindrical surface. The battery cell 2 may include a positive electrode and a negative electrode (not shown in the figure), and a separator disposed between the positive electrode and the negative electrode.

[0038] In this example embodiment, the battery may further include a positive tab and a negative tab (not shown in the figure). The positive tab is connected to the cell 2, specifically, the positive tab is connected to the positive electrode plate; the positive tab is located at the end of the cell 2 near the top surface 11, that is, the positive tab is located at the end of the cell 2 near the battery terminal 7. The negative tab is connected to the cell 2, specifically, the negative tab is connected to the negative electrode plate; and the negative tab can be located on the same side of the cell 2 as the positive tab, that is, the negative tab can be located at the end of the cell 2 near the top surface 11, or in other words, the negative tab can be located at the end of the cell 2 near the battery terminal 7. Therefore, in this case, the end face of the cell 2 near the battery terminal 7 is the outer surface from which the tab of the cell 2 is led out.

[0039] Of course, in some other exemplary embodiments of this disclosure, the negative tab and the positive tab can be located at opposite ends of the cell 2, that is, the positive tab is located at the end of the cell 2 near the top surface 11, and the negative tab can be located at the end of the cell 2 near the bottom surface 12. Therefore, in this case, the end face of the cell 2 near the battery terminal 7 and the end face away from the battery terminal 7 are both the outer surfaces from which the tabs of the cell 2 are led out.

[0040] It should be noted that the tab lead-out direction Z is perpendicular to the end face of cell 2 near the battery terminal 7, or it can be said to be the same direction as the axis of the cylindrical battery. The outer side surface of cell 2 is parallel to the tab lead-out direction Z. For example, in a cylindrical battery, the outer side surface of cell 2 is the cylindrical outer surface of cell 2.

[0041] In this example embodiment, a first current collector 5, a second current collector 6, and an insulating member 4 are provided on the side of the positive and negative tabs near the top surface 11. The second current collector 6 has the opposite polarity to the first current collector 5; for example, the first current collector 5 can be a positive current collector, and the second current collector 6 can be a negative current collector. The positive tab is connected to the first current collector 5, and the negative tab is connected to the second current collector 6.

[0042] Since both the first current collector 5 and the second current collector 6 are located on the side of the cell 2 near the top surface 11, insulation is required between the first current collector 5 and the second current collector 6. Therefore, an insulating member 4 is provided to insulate between the first current collector 5 and the second current collector 6.

[0043] Of course, in some other exemplary embodiments of this disclosure, the first current collector 5 can be a negative current collector and the second current collector 6 can be a positive current collector. When the negative and positive tabs are located at opposite ends of the battery cell 2, the first current collector 5 and the second current collector 6 need to be insulated from other components. Therefore, insulating elements 4 can be provided at opposite ends of the battery cell 2 to insulate the first current collector 5 and the second current collector 6 from other components.

[0044] Reference Figure 1As shown, a battery terminal 7 is provided on the side of the battery cell 2 near the top surface 11. The positive electrode tab is connected to the battery terminal 7. Specifically, the positive electrode tab is connected to the battery terminal 7 through a first current collector 5. The battery terminal 7 extends out of the battery housing 1 through a through hole on the top surface 11 to form the positive terminal of the battery. Moreover, the battery terminal 7 is arranged with the battery on the same central axis, that is, the central axis of the battery terminal 7 is collinear with the central axis of the battery. The negative electrode tab can be connected to the battery housing 1. Specifically, the negative electrode tab is connected to the battery housing 1 through a second current collector 6, and the battery housing 1 forms the negative terminal of the battery. Of course, in some other exemplary embodiments of this disclosure, the battery terminal 7 can be the negative terminal of the battery, and the battery housing 1 can be the positive terminal of the battery. Moreover, the battery terminal 7 is insulated from the battery housing 1. Specifically, the battery terminal 7 is insulated from the top surface 11.

[0045] Since the battery casing 1 forms the negative electrode of the battery and the first current collector 5 is connected to the positive electrode tab, insulation is also required between the first current collector 5 and the battery casing 1.

[0046] In this example embodiment, an insulating film 3 is covered on the outer side surface of the battery cell 2. Specifically, the insulating film 3 only covers the cylindrical outer side surface of the battery cell 2, and is not present on the two opposite end faces of the battery cell 2. The insulating film 3 insulates and isolates the battery cell 2 from the battery casing 1. The insulating film 3 is bonded to the cylindrical outer side surface of the battery cell 2 with adhesive. Furthermore, the insulating film 3 is rectangular and surrounds the cylindrical outer side surface of the battery cell 2, thus forming an interface portion. After electrolyte is injected into the battery casing 1, the adhesive between the insulating film 3 and the battery cell 2 is prone to failure due to immersion in the electrolyte, causing the insulating film 3 to separate from the battery cell 2. Moreover, because the insulating film 3 has an interface portion, it can easily peel off directly from the battery cell 2, resulting in insulation failure between the battery cell 2 and the battery casing 1.

[0047] To solve the above-mentioned technical problems, an insulating member 4 is provided at at least one end of the battery cell 2. For example, the insulating member 4 is provided at the end of the battery cell 2 near the battery terminal 7. Of course, insulating members 4 can also be provided at both opposite ends of the battery cell 2. This arrangement ensures that the surface of the battery cell 2 with the insulating member 4 is perpendicular to the surface of the battery cell 2 covered with the insulating film 3. The insulating member 4 may include a body portion 41 and a limiting portion 42. The limiting portion 42 is connected to the side of the body portion 41 near the battery cell 2, that is, the limiting portion 42 is connected to the side of the body portion 41 away from the battery terminal 7. The limiting portion 42 is fixed to the side of the insulating film 3 away from the battery cell 2. The limiting portion 42 can fix the insulating film 3, so even if the adhesive between the insulating film 3 and the battery cell 2 fails, causing the insulating film 3 to separate from the battery cell 2, the insulating film 3 will not peel off from the battery cell 2, ensuring the insulation effect between the battery cell 2 and the battery casing 1.

[0048] Moreover, the hardness of the insulating member 4 is greater than that of the insulating film 3, which allows the limiting part 42 of the insulating member 4 to limit and fix the insulating film 3.

[0049] Reference Figure 3 and Figure 4 As shown, the limiting part 42 can be cylindrical, and the limiting part 42 can be configured to fit the shape of the battery cell 2. For example, if the battery cell 2 is cylindrical, the limiting part 42 can be cylindrical; if the battery cell 2 is prismatic, the limiting part 42 can be polygonal cylindrical. In this case, the limiting part 42 can be arranged around the side of the insulating film 3 away from the battery cell 2.

[0050] Of course, in some other exemplary embodiments of this disclosure, the limiting portion 42 can be configured as at least two, with at least two limiting portions 42 spaced apart on the side of the insulating film 3 facing away from the battery cell 2. Specifically, for example, the limiting portion 42 can be configured as two, with the two limiting portions 42 disposed opposite each other on the side of the insulating film 3 facing away from the battery cell 2. The specific structure of the two limiting portions 42 can be that the cylindrical limiting portion 42 is provided with two grooves, thereby forming two limiting portions 42. Alternatively, the limiting portion 42 can be configured as three, with the three limiting portions 42 evenly distributed on the side of the insulating film 3 facing away from the battery cell 2. The specific structure of the three limiting portions 42 can be that the cylindrical limiting portion 42 is provided with three grooves, thereby forming three limiting portions 42.

[0051] Moreover, referencing Figure 3 and Figure 4 As shown, the distance between the limiting part 42 and the insulating film 3 in the direction of the electrode lead-out is d1, and the length of the insulating film 3 in the Z direction of the electrode lead-out is d2. The value of d1 / d2 is greater than or equal to 0.1% and less than or equal to 5%. For example, the ratio of d1 to d2 can be 0.5%, 1%, 1.3%, 1.8%, 2.2%, 2.7%, 3.2%, 3.6%, 4.1%, 3.5%, 4.8%, etc.

[0052] If the fixed distance between the limiting part 42 and the insulating film 3 is too small, the binding force of the limiting part 42 on the insulating film 3 will be too weak, resulting in an unreliable fixation between the insulating film 3 and the cell 2, which may lead to the risk of the insulating film 3 detaching from the cell 2 and causing a short circuit between the cell 2 and the battery casing 1. However, if the fixed distance between the limiting part 42 and the insulating film 3 is too large, the limiting part 42 will occupy a large space inside the battery, affecting the overall space utilization of the battery. At the same time, due to the high hardness of the insulating component 4, when the cell expands, the binding of the two-layer structure of the limiting part 42 and the insulating film 3 makes it difficult for the cell 2 to expand, and the local stress concentration may cause the electrode to fall off, affecting the overall cycle life of the battery.

[0053] Furthermore, the insulating member 4 may also include a guide structure 43. The guide structure 43 is disposed on the side of the limiting part 42 near the insulating film 3 and is located at the end of the limiting part 42 away from the main body part 41. The guide structure 43 can provide guidance for the limiting part 42 and the battery cell 2 covered with the insulating film 3, so as to prevent the edge of the insulating film 3 from warping due to the squeezing action of the limiting part 42 when the battery cell 2 covered with the insulating film 3 is inserted into the limiting part 42, which would prevent the battery cell 2 covered with the insulating film 3 from being inserted into the required position of the limiting part 42; and also to avoid affecting the insulation performance of the insulating film 3.

[0054] Specifically, the distance between the side of the limiting part 42 near the insulating film 3 and the outer side surface of the battery cell 2 on the first surface increases with the distance from the main body 41, forming a guide structure 43. That is, the further away from the main body 41, the greater the distance between the side of the limiting part 42 near the insulating film 3 and the outer side surface of the battery cell 2 on the first surface. When the limiting part 42 is cylindrical, it can also be said that the area surrounded by the cross-section of the inner cylindrical wall of the limiting part 42 increases with the distance from the main body 41. For example, the inner cylindrical wall of the limiting part 42 can be set as a slope, and the distance between the slope and the outer side surface of the battery cell 2 on the first surface increases with the distance from the main body 41, forming a guide structure 43. The inner cylindrical wall of the limiting part 42 can be set as an arc surface, and the distance between the arc surface and the outer side surface of the battery cell 2 on the first surface increases with the distance from the main body 41, forming a guide structure 43. The first surface is perpendicular to the tab lead-out direction Z.

[0055] Furthermore, when the distance between the inner wall of the limiting part 42 and the side 13 of the battery cell 2 on the first surface increases with the increase of the distance from the main body 41 to form a guide structure 43, the end of the limiting part 42 near the main body 41 is press-fitted with the insulating film 3, so that the end of the limiting part 42 near the main body 41 abuts against the insulating film 3. Compared with "connection", "abutting" emphasizes that there is a force between the two. That is to say, there is a force between the end of the limiting part 42 near the main body 41 and the insulating film 3. Specifically, the end of the limiting part 42 near the main body 41 exerts a compressive force on the insulating film 3, which further ensures that even if the adhesive between the insulating film 3 and the battery cell 2 fails, causing the insulating film 3 to separate from the battery cell 2, the insulating film 3 will not peel off from the battery cell 2, further ensuring the insulation effect between the battery cell 2 and the battery casing 1.

[0056] Of course, in some other exemplary embodiments of this disclosure, if the inner wall of the limiting part 42 is configured with other structures, the end of the limiting part 42 near the main body part 41 may also be interference-fitted with the insulating film 3.

[0057] In addition, the limiting part 42 and the insulating film 3 can also be fixedly connected by means of bonding, heat fusion or other methods.

[0058] The structure of the first current collector 5, the second current collector 6, and the insulating component 4 will be illustrated below with examples.

[0059] Reference Figure 3 and Figure 4 As shown, the insulating member 4 may include a body portion 41; specifically, the body portion 41 may include an insulating ring 413 and a partition baffle 414. The insulating ring 413 is configured in a shape adapted to the battery. For example, if the battery is configured as a cylindrical battery, the insulating ring 413 is configured as an annular shape. The insulating ring 413 is disposed in the peripheral region of the side of the cell 2 near the top surface 11. A partition baffle 414 is connected to the inner ring surface of the insulating ring 413, dividing the interior of the insulating ring 413 into spaced first through holes 411 and second through holes 412. Specifically, three partition baffles 414 can be provided. The partition baffles 414 are configured as bent structures, such that both ends of the partition baffles 414 extend in one direction. Both ends of the partition baffles 414 are connected to the inner ring surface of the insulating ring 413. The side of the partition baffles 414 with an acute angle is the inner side of the bend, and the side of the partition baffles 414 with an obtuse angle is the outer side of the bend. One partition baffle 414 and the insulating ring 413 surround to form a second through hole 412, that is, the inner side of the bend of the partition baffles 414 is the second through hole 412. Three partition baffles 414 form three second through holes 412, and the second through holes 412 are fan-shaped ring structures. Three partition baffles 414 and an insulating ring 413 surround each other to form a first through hole 411, that is, the outer side of the bend of the three partition baffles 414 is the first through hole 411, forming a first through hole 411. The first through hole 411 has a propeller-like structure, and the three second through holes 412 are insulated from the first through hole 411 by the partition baffles 414.

[0060] The partition baffle 414 may include a first part 4141, a second part 4142, and a third part 4143. The second part 4142 is connected between the first part 4141 and the third part 4143, and the first part 4141 and the third part 4143 are symmetrically arranged. Both the first part 4141 and the third part 4143 extend radially along the insulating member 4 and are connected to the inner ring surface of the insulating ring 413. The included angle between the first part 4141 and the third part 4143 is approximately 60 degrees. The first part 4141 and the third part 4143 are configured in a fan shape, such that the width of the first part 4141 and the third part 4143 increases with the increase of the distance from the central axis of the insulating member 4, that is, the width of the first part 4141 and the third part 4143 is wider the closer they are to the insulating ring 413.

[0061] The second part 4142 is connected to the side of the first part 4141 and the third part 4143 away from the insulating ring 413. The length of the first part 4141 and the third part 4143 is less than the radius of the inner ring surface of the insulating ring 413, and the extension direction of the second part 4142 is basically perpendicular to the radial direction of the insulating ring 413, so that the partition baffle 414 forms a bent structure, and the partition baffle 414 does not cross the center of the inner ring surface of the insulating ring 413.

[0062] The partition baffle 414 can increase the structural strength of the insulating component 4, prevent the insulating ring 413 from deforming under stress, and ensure the electrical performance of each battery.

[0063] Additionally, the partition baffles 414 can be configured as two, four, or more. When there are two partition baffles 414, the two partition baffles 414 and the insulating ring 413 form two second through holes 412, which are fan-shaped rings. The two partition baffles 414 and the insulating ring 413 surround each other to form a first through hole 411, which is approximately a bow-shaped structure.

[0064] Of course, when the first current collector 5 and the second current collector 6 are disposed on opposite sides of the battery cell 2, a through hole can be provided on the insulating member 4, and the body part 41 can include an insulating ring 413, which surrounds the through hole, excluding the partition baffle 414.

[0065] Reference Figure 3 and Figure 5 As shown, at least a portion of the first current collector 5 is disposed within the first through hole 411, and at least a portion of the second current collector 6 is disposed within the second through hole 412. The insulating member 4 not only fixes the insulating film but also provides insulation and isolation between the first current collector 5 and the second current collector 6. The first current collector 5 is connected to the positive electrode tab through the first through hole 411, and the connection method can be welding; the second current collector 6 is connected to the negative electrode tab through the second through hole 412, and the connection method can also be welding. Of course, other connection methods are also possible, which will not be elaborated here.

[0066] In addition, since the first current collector 5 is connected between the positive electrode tab and the battery terminal 7, and the battery terminal 7 and the battery are arranged with the same central axis, the central axis of the battery needs to pass through the first current collector 5, that is, a part of the first current collector 5 needs to be arranged in the central area of ​​the battery.

[0067] Please continue to refer to Figure 3 and Figure 4As shown, at least a portion of the hole wall of the first through hole 411 is configured as a stepped structure. Specifically, the sidewalls of the first portion 4141 and the third portion 4143 of the partition baffle 414 near the first through hole 411 are configured as stepped structures, and the portion of this sidewall near the battery cell 2 protrudes beyond the portion of the sidewall away from the battery cell 2. This results in a smaller area of ​​the portion of the first through hole 411 near the battery cell 2 and a larger area of ​​the portion away from the battery cell 2. The first current collector 5 is disposed on the stepped surface of the stepped structure, that is, the first current collector 5 is disposed within the portion of the first through hole 411 away from the battery cell 2. This allows the stepped surface of the stepped structure to support and limit the first current collector 5, preventing the first current collector 5 from displacing towards the battery cell 2.

[0068] Furthermore, the insulating member 4 may also include a protrusion 44, which is disposed on the wall of the first through hole 411. Specifically, the protrusion 44 may be disposed on the stepped surface of the stepped structure, and the protrusion 44 is integrally connected to a portion of the sidewall of the first through hole 411 away from the battery cell 2. The side of the protrusion 44 away from the wall of the first through hole 411 is set as a cylindrical surface. Moreover, the protrusion 44 is also disposed on the sidewall of the insulating ring 413 near the first through hole 411, and the side of these protrusions 44 away from the wall of the first through hole 411 is set as a cylindrical surface. Of course, in some other exemplary embodiments of this disclosure, the protrusion 44 may also be disposed on the sidewall of the second portion 4142 near the first through hole 411, and the specific structure of the protrusion 44 can be set as needed.

[0069] Reference Figure 3 and Figure 6 As shown, at least a portion of the first current collector 5 is disposed within the first through hole 411. Specifically, the first current collector 5 may include a first current collector 51 and a second current collector 52, with the first current collector 51 connected to the second current collector 52. There is one first current collector 51, which may be hexagonal in shape. The first current collector 51 is located in the middle of the insulating member 4, meaning its central axis is collinear with the central axis of the insulating member 4. There are three second current collectors 52, each with a fan-shaped annular structure. The three second current collectors 52 are correspondingly connected to the three edges of the first current collector 51, and adjacent second current collectors 52 are spaced apart, meaning that one edge of the first current collector 51 is not connected to a second current collector 52 between adjacent second current collectors 52.

[0070] Furthermore, the first current collector 5 needs to be connected to the battery terminal 7. Specifically, the first current collector 51 is connected to the battery terminal 7. Therefore, a protruding structure is provided on the first current collector 51. This protruding structure is cylindrical and matches the cylindrical recessed structure on the battery terminal 7.

[0071] Furthermore, the first current collector 5 is provided with a recessed portion 53. Specifically, the recessed portion 53 is provided along the edge of the second current collector 52, that is, the recessed portion 53 is recessed into the inner side of the second current collector 52. The protrusion 44 is located inside the recessed portion 53. Through the cooperation between the protrusion 44 and the recessed portion 53, the first current collector 5 can be positioned radially in the battery to prevent displacement of the first current collector 5 and ensure the electrical performance of the battery.

[0072] Reference Figure 3 and Figure 5 As shown, since the second current collector 6 is connected between the negative electrode tab and the battery casing 1, specifically, the second current collector 6 is connected between the negative electrode tab and the top surface 11, the second current collector 6 may include a current collector ring 61, a current collector cylinder 62, and a current collector plate 63. The current collector ring 61 is configured with a shape adapted to the insulating ring 413. For example, the current collector ring 61 is configured as a circular ring. Of course, if the insulating ring 413 is configured as a rectangular ring, the current collector ring 61 is configured as a rectangular ring.

[0073] The current collector ring 61 is located on the side of the insulating ring 413 near the top surface 11, allowing the current collector ring 61 to contact and connect with the top surface 11. Three current collector cylinders 62 are provided, each partially cylindrical, extending axially along the battery. The current collector cylinders 62 connect between the current collector ring 61 and the current collector plate 63. Specifically, one end of the current collector cylinder 62 is connected to the inner ring surface of the current collector ring 61, and the current collector ring 61 is connected to the side of the current collector cylinder 62 near the top surface 11. The current collector plate 63 is connected to the side of the current collector cylinder 62 away from the top surface 11, such that the height of the current collector plate 63 is lower than the height of the current collector ring 61. The current collector plate 63 is configured as a roughly fan-shaped plate, located within the second through hole 412.

[0074] In this example implementation, refer to Figure 1 and Figure 2 As shown, the main body 41 may further include a positioning part 415, which is disposed on the inner annular surface of the insulating ring 413 and within the second through hole 412. The positioning part 415 may be configured as a semi-annular structure, such that the side of the positioning part 415 facing away from the insulating ring 413 is an annular surface. The side of the positioning part 415 facing away from the insulating ring 413 abuts against the side of the second current collector 6 near the insulating ring 413. The positioning part 415 can fix the second current collector 6 in place, preventing the second current collector 6 from shifting radially in the battery, thereby ensuring the battery's electrical performance.

[0075] The battery can be a single cell, or it can be a battery module or a battery pack.

[0076] It should be noted that when the battery is a battery module or battery pack, the battery may also include other necessary components and parts, such as battery box, circuit board, control components, etc. Those skilled in the art can make corresponding additions according to the specific usage requirements of the battery, which will not be elaborated here.

[0077] The terms "parallel" and "perpendicular" used in this application do not refer to complete parallelism or perpendicularity, but rather to a certain degree of error. For example, if the included angle between two objects is greater than or equal to 0° and less than or equal to 5°, they are considered to be parallel to each other; if the included angle between two objects is greater than or equal to 85° and less than or equal to 95°, they are considered to be perpendicular to each other.

[0078] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A battery, characterized in that, The battery is a cylindrical battery, comprising: Battery casing; The battery cell is located inside the battery casing; An insulating film is wrapped around the cylindrical outer side surface of the battery cell to insulate and isolate the battery casing from the battery cell. The outer side surface is parallel to the tab lead-out direction. The insulating film surrounds the cylindrical outer side surface of the battery cell, so that the insulating film forms an interface portion. An insulating component is provided at least at one end of the battery cell. The insulating component includes a body portion and a limiting portion. The limiting portion is connected to the side of the body portion near the battery cell and fixed to the side of the insulating film away from the battery cell. The limiting portion and the interface portion have an overlapping area. The distance between the limiting part and the insulating film in the electrode lead-out direction is d1, the length of the insulating film in the electrode lead-out direction is d2, and the value of d1 / d2 is greater than or equal to 0.1% and less than or equal to 5%.

2. The battery according to claim 1, characterized in that, The surface of the battery cell on which the insulating element is disposed is perpendicular to the surface of the battery cell covered by the insulating film.

3. The battery according to claim 1, characterized in that, The limiting part is cylindrical and surrounds the insulating film on the side opposite to the battery cell.

4. The battery according to claim 1, characterized in that, The limiting part is provided in at least two parts, and the at least two limiting parts are spaced apart on the side of the insulating film away from the battery cell.

5. The battery according to any one of claims 1 to 4, characterized in that, The hardness of the insulating component is greater than the hardness of the insulating film.

6. The battery according to any one of claims 1 to 4, characterized in that, The insulating component also includes: A guide structure is provided on the side of the limiting portion near the insulating film, and is located at the end of the limiting portion away from the main body portion.

7. The battery according to claim 6, characterized in that, The distance between the side of the limiting portion near the insulating film and the outer side surface of the battery cell on the first surface increases with the increase of the distance from the body portion to form the guiding structure, and the first surface is perpendicular to the lead-out direction of the electrode tab.

8. The battery according to any one of claims 1 to 4, characterized in that, The end of the limiting portion near the body portion is press-fitted with the insulating film.

9. The battery according to any one of claims 1 to 4, characterized in that, The main body is provided with a first through hole and a second through hole, which are spaced apart.

10. The battery according to claim 9, characterized in that, The battery also includes: A first current collector, at least a portion of which is located within the first through hole; The second current collector has the opposite polarity to the first current collector, and at least a portion of the second current collector is located within the second through hole.

11. The battery according to claim 10, characterized in that, The body portion includes: Insulating ring; At least two partition baffles are provided, each partition baffle having a bent structure. Both ends of the partition baffles are connected to the inner ring surface of the insulating ring. One partition baffle and the insulating ring surround to form a second through hole, and at least two partition baffles and the insulating ring surround to form a first through hole.

12. The battery according to claim 11, characterized in that, The body portion also includes: A positioning part is provided on the inner ring surface of the insulating ring, and the side of the positioning part away from the insulating ring abuts against the side of the second current collector close to the insulating ring.

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