Single battery and battery pack

Abstract

The invention relates to a single battery and a battery pack, and relates to the technical field of battery protection. Each single battery comprises an inner tab, an outer tab and a tab protection part, one end of the inner tab is connected with the outer tab, the other end of the inner tab is connected with the pole core, and the tab protection part wraps the edge of one end, close to the inner tab, of the outer tab so as to separate the outer tab from the pole core. The tab protection part wraps the edge of one end, close to the inner tab, of the outer tab, so that the outer tab is separated from the pole core, and under the protection of the tab protection part, the phenomenon that burrs of the outer tab cut a diaphragm and a pole piece to cause short circuit of the pole core is avoided.

Description

Technical Field

[0001] The present application relates to the field of battery protection technology, and in particular to a single cell and a battery pack. Background Art

[0002] Soft-pack lithium batteries usually refer to lithium batteries whose outer shells are encapsulated with aluminum-plastic film. Due to their many advantages such as light structure and weight, low mold cost, great structural flexibility, high energy density, and high core safety performance, they have been widely used in various fields such as electric vehicles, drones, smart homes, and mobile power supplies.

[0003] The existing soft-pack battery structure mainly consists of: aluminum-plastic film shell, pole group, outer pole ear, etc. The pole group includes a pole core and an inner pole ear, and the outer pole ear includes an electrode sheet and a pole ear insulating glue (injection molding integrated structure). The aluminum-plastic film is punched out of the cavity that accommodates the pole group by mold stamping. After the pole group is placed in the cavity, it is sealed by hot-pressing the aluminum-plastic film edge. At the same time, the aluminum-plastic film shell is hot-pressed and sealed with the pole ear insulating glue of the outer pole ear during the sealing process to achieve the sealing of the pole core. One end of the outer pole ear is fixed to the inner pole ear of the pole group by laser welding, and the other end is led out of the aluminum-plastic film shell. The middle part is isolated from the aluminum-plastic film shell by the pole ear insulating glue, so as to lead out the current. However, the current outer pole ear is stamped from aluminum sheets, and the end welded to the inner pole ear is prone to burrs, which is easy to cut the diaphragm and the pole sheet, resulting in a high risk of short circuit of the pole core. Summary of the invention

[0004] The embodiments of the present application provide a single cell and a battery pack, which can solve the technical problem that one end of the welding between the outer pole ear and the inner pole ear is prone to burrs, which can easily cut the diaphragm and the pole piece and cause a short circuit in the pole core.

[0005] An embodiment of the present application provides a single cell battery, which includes: an inner pole ear, an outer pole ear, a pole ear protection portion and a pole core, wherein one end of the inner pole ear is connected to the outer pole ear, and the other end of the inner pole ear is connected to the pole core, and the pole ear protection portion is covered on the edge of the outer pole ear close to one end of the inner pole ear to block the outer pole ear from the pole core.

[0006] In some embodiments, the outer tab has a first end surface close to the inner tab in its length direction, and the outer tab has two opposite surfaces in its thickness direction. The tab protection portion covers the first end surface and extends to cover the surface.

[0007] In some embodiments, the dimension of the tab protection portion on the surface in the thickness direction of the outer tab is 0.1 mm-0.2 mm.

[0008] In some embodiments, the outer tab has two opposite side surfaces in the width direction thereof, and the tab protection portion further covers the side surfaces.

[0009] In some embodiments, the outer tab further includes an arc surface, the arc surface is connected between the first end surface and the side surface, and the tab protection portion further covers the arc surface.

[0010] In some embodiments, the dimension of the tab protection portion on the side surface in the length direction of the outer tab is greater than or equal to 1 mm.

[0011] In some embodiments, the tab protection portion located on the surface includes two widened portions and a main body portion, wherein the main body portion is connected between the two widened portions.

[0012] In some embodiments, a dimension of the widened portion in the length direction of the outer tab is greater than a radius of the arc surface.

[0013] In some embodiments, the single battery further includes a tab insulating portion, which is disposed around the outer periphery of the outer tab in the thickness direction and the outer periphery of the outer tab in the width direction, and the tab protecting portion is connected to the tab insulating portion.

[0014] An embodiment of the present application also provides a battery pack, which includes the single cell of the present application.

[0015] The single cell and battery pack provided in the embodiments of the present application have a pole ear protection portion covering the edge of the outer pole ear close to the inner pole ear to isolate the outer pole ear from the pole core. Under the protection of the pole ear protection portion, the burrs of the outer pole ear are prevented from cutting the diaphragm and the pole piece, causing a short circuit in the pole core. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of a single cell structure in the prior art;

[0018] Figure 2 A schematic diagram of the overall structure of a single cell provided in an embodiment of the present application;

[0019] Figure 3 A partial structural schematic diagram of a single cell is provided for Example 1 of the present application;

[0020] Figure 4 A schematic diagram of the structure of the outer pole ear is provided for Example 1 of the present application;

[0021] Figure 5 Provide side views of the tab protection portion and the outer tab for Examples 1 to 4 of the present application;

[0022] Figure 6 A top view of a tab protection portion, an outer tab, and a tab insulation portion provided in Example 1 of the present application;

[0023] Figure 7 A partial structural schematic diagram of a single cell is provided for Example 2 of the present application;

[0024] Figure 8 A top view of a tab protection portion, an outer tab, and a tab insulation portion provided in Example 2 of the present application;

[0025] Fig. 9 A partial structural schematic diagram of a single cell is provided for Example 3 of the present application;

[0026] Fig.10 A top view of a tab protection portion, an outer tab, and a tab insulation portion provided in Example 3 of the present application;

[0027] Fig.11 A partial structural schematic diagram of a single cell is provided for Example 4 of the present application;

[0028] Fig.12 A top view of the pole tab protection portion, the outer pole tab and the pole tab insulation portion provided in Example 4 of the present application.

[0029] Description of reference numerals:

[0030] 90. Single cell; 91. Pole core; 92. Inner pole ear; 93. Outer pole ear; 94. Aluminum-plastic film shell;

[0031] 1. Inner pole ear; 2. Outer pole ear; 3. Pole ear protection part; 4. Pole ear insulation part; 5. Pole core; 6. Aluminum-plastic film shell;

[0032] 21. first end surface; 22. surface; 23. side surface; 24. arc surface;

[0033] 31. Widened portion; 32. Main body portion. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present application are described in detail below in conjunction with the drawings in the specification, so as to fully introduce the technical content of the present application to those skilled in the art, to illustrate that the present application can be implemented, to make the technical content disclosed in the present application clearer, and to make it easier for those skilled in the art to understand how to implement the present application. However, the present application can be embodied through many different forms of embodiments, and the protection scope of the present application is not limited to the embodiments mentioned in the text, and the description of the embodiments below is not intended to limit the scope of the present application.

[0035] The directional terms mentioned in this application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only directions in the drawings. The directional terms used in this article are used to explain and illustrate this application, and are not used to limit the scope of protection of this application.

[0036] In the drawings, components with the same structure are represented by the same numerical labels, and components with similar structures or functions are represented by similar numerical labels. In addition, for the convenience of understanding and description, the size and thickness of each component shown in the drawings are arbitrarily shown, and the present application does not limit the size and thickness of each component.

[0037] See also Figure 1 The single cell 90 in the prior art includes a pole core 91, an inner pole ear 92 and an outer pole ear 93. The inner pole ear 92 is arranged on both sides of the pole core 91 in the length direction, and the inner pole ear 92 extends along the length direction of the pole core 91. The inner pole ear 92 and the outer pole ear 93 are fixed by laser welding to achieve the connection between the inner pole ear 92 and the outer pole ear 93, so as to lead the current out of the aluminum-plastic film shell 94. The outer pole ear 93 structure is stamped from an aluminum sheet, and the end welded to the inner pole ear 92 is prone to burrs, which is easy to cut the diaphragm and pole piece of the pole core 91, resulting in a high risk of short circuit of the pole core 91.

[0038] Example 1

[0039] See also Figure 2 , Figure 3 and Figure 4 The embodiment of the present application provides a single battery, which includes an inner pole ear 1, an outer pole ear 2, a pole ear protection part 3, a pole core 5 and an aluminum-plastic film shell 6. The pole core 5 and the inner pole ear 1 are located in the aluminum-plastic film shell 6. A part of the outer pole ear 2 is located in the aluminum-plastic film shell 6, and another part of the outer pole ear 2 extends out of the aluminum-plastic film shell 6. The pole ear protection part 3 is located in the aluminum-plastic film shell 6.

[0040] One end of the inner pole ear 1 is connected to the outer pole ear 2, and the other end of the inner pole ear 1 is connected to the pole core 5. The inner pole ear 1 and the outer pole ear 2 are welded by laser welding or ultrasonic welding.

[0041] See also Figure 4 The outer pole lug 2 has a first end surface 21 close to the inner pole lug 1 in its length direction, two opposite surfaces 22 in its thickness direction, and two opposite side surfaces 23 in its width direction.

[0042] Among them, the pole ear protection part 3 is covered on the edge of one end of the outer pole ear 2 close to the inner pole ear 1 to block the outer pole ear 2 from the pole core 5, thereby preventing the burrs of the outer pole ear 2 from cutting the diaphragm and pole piece of the pole core 5 under the protection of the pole ear protection part 3, thereby avoiding causing a short circuit in the pole core 5.

[0043] See also Figure 2 , Figure 3 , Figure 4 and Figure 5 The tab protection portion 3 covers the first end surface 21 and extends to cover the surface 22. The tab protection portion 3 located on the surface 22 has a dimension H in the thickness direction of the outer tab 2. 1 In this embodiment, the dimension H of the tab protection portion 3 located on the surface 22 in the thickness direction of the outer tab 2 is 1 The distance between the tab protection part 3 and the outer tab 2 is 0.15 mm. This can improve the connection stability between the tab protection part 3 and the outer tab 2, and prevent the tab protection part 3 from falling off. In this embodiment, the tab protection part 3 covers the first end face 21 and the two surfaces 22. In other embodiments, the tab protection part can cover the first end face 21 and one surface 22.

[0044] See also Figure 2 , Figure 3 , Figure 4 and Figure 6 , the tab protection part 3 also covers the side surface 23. The dimension L of the tab protection part 3 located on the side surface 23 in the length direction of the outer tab 2 is 1 In this embodiment, the dimension L of the tab protection portion 3 located on the side surface 23 in the length direction of the outer tab 2 is 1 The distance between the tab protection part 3 and the outer tab 2 is 1.5 mm, thereby further increasing the connection stability between the tab protection part 3 and the outer tab 2 and preventing the tab protection part 3 from falling off.

[0045] See also Figure 2 , Figure 3 , Figure 4 and Figure 6 , the outer pole ear 2 also includes an arc surface 24. The arc surface 24 is connected between the first end face 21 and the side face 23, and the pole ear protection part 3 also covers the arc surface 24. The radius R of the arc surface 24 is 1.5mm-4mm. This can further increase the connection stability between the pole ear protection part 3 and the outer pole ear 2, and prevent the pole ear protection part 3 from falling off. In this embodiment, the radius R of the arc surface 24 is 2mm. In other embodiments, the outer pole ear 2 may also not include the arc surface 24, that is, the first end face 21 and the side face 23 are directly arranged at an angle.

[0046] See also Figure 2 , Figure 3 and Figure 4 , the tab insulating portion 4 is disposed around the outer periphery of the outer tab 2. Specifically, the tab insulating portion 4 is disposed around the outer periphery of the outer tab 2 in the thickness direction and the outer periphery of the outer tab 2 in the width direction. In this embodiment, the tab protection portion 3 is spaced from the tab insulating portion 4, that is, there is a gap between the tab protection portion 3 and the tab insulating portion 4.

[0047] In the present application, the pole ear protection part 3 is covered on the edge of one end of the outer pole ear 2 close to the inner pole ear 1 to isolate the outer pole ear 2 from the pole core 5. Under the protection of the pole ear protection part 3, the burrs of the outer pole ear 2 are prevented from cutting the diaphragm and pole piece of the pole core 5, thereby avoiding causing a short circuit in the pole core.

[0048] Example 2

[0049] See also Figure 2 , Figure 4 and Figure 7 The embodiment of the present application provides a single battery, which includes an inner pole ear 1, an outer pole ear 2, a pole ear protection part 3, a pole core 5 and an aluminum-plastic film shell 6. The pole core 5 and the inner pole ear 1 are located in the aluminum-plastic film shell 6. A part of the outer pole ear 2 is located in the aluminum-plastic film shell 6, and another part of the outer pole ear 2 extends out of the aluminum-plastic film shell 6. The pole ear protection part 3 is located in the aluminum-plastic film shell 6.

[0050] One end of the inner pole ear 1 is connected to the outer pole ear 2, and the other end of the inner pole ear 1 is connected to the pole core 5. The inner pole ear 1 and the outer pole ear 2 are welded by laser welding or ultrasonic welding.

[0051] See also Figure 4 The outer pole lug 2 has a first end surface 21 close to the inner pole lug 1 in its length direction, two opposite surfaces 22 in its thickness direction, and two opposite side surfaces 23 in its width direction.

[0052] Among them, the pole ear protection part 3 is covered on the edge of one end of the outer pole ear 2 close to the inner pole ear 1 to block the outer pole ear 2 from the pole core 5, thereby preventing the burrs of the outer pole ear 2 from cutting the diaphragm and pole piece of the pole core 5 under the protection of the pole ear protection part 3, thereby avoiding causing a short circuit in the pole core 5.

[0053] See also Figure 2 , Figure 4 , Figure 5 and Figure 7 The tab protection portion 3 covers the first end surface 21 and extends to cover the surface 22. The tab protection portion 3 located on the surface 22 has a dimension H in the thickness direction of the outer tab 2. 1 In this embodiment, the dimension H of the tab protection portion 3 located on the surface 22 in the thickness direction of the outer tab 2 is 1 The distance between the tab protection part 3 and the outer tab 2 is 0.15 mm. This can improve the connection stability between the tab protection part 3 and the outer tab 2, and prevent the tab protection part 3 from falling off. In this embodiment, the tab protection part 3 covers the first end face 21 and the two surfaces 22. In other embodiments, the tab protection part can cover the first end face 21 and one surface 22.

[0054] See also Figure 2 , Figure 4 , Figure 7 and Figure 8 , the tab protection part 3 also covers the side surface 23. The dimension L of the tab protection part 3 located on the side surface 23 in the length direction of the outer tab 2 is 1 In this embodiment, the dimension L of the tab protection portion 3 located on the side surface 23 in the length direction of the outer tab 2 is 1 The distance between the tab protection part 3 and the outer tab 2 is 1.5 mm, thereby further increasing the connection stability between the tab protection part 3 and the outer tab 2 and preventing the tab protection part 3 from falling off.

[0055] See also Figure 2 , Figure 4 , Figure 7 and Figure 8 , the outer pole ear 2 also includes an arc surface 24. The arc surface 24 is connected between the first end face 21 and the side face 23, and the pole ear protection part 3 also covers the arc surface 24. The radius R of the arc surface 24 is 1.5mm-4mm. This can further increase the connection stability between the pole ear protection part 3 and the outer pole ear 2, and prevent the pole ear protection part 3 from falling off. In this embodiment, the radius R of the arc surface 24 is 2mm. In other embodiments, the outer pole ear 2 may also not include the arc surface 24, that is, the first end face 21 and the side face 23 are directly arranged at an angle.

[0056] See also Figure 2 , Figure 4 , Figure 7 and Figure 8 , the tab insulation portion 4 is arranged around the outer periphery of the outer tab 2. Specifically, the tab insulation portion 4 is arranged around the outer periphery of the outer tab 2 in the thickness direction and the outer periphery of the outer tab 2 in the width direction. In this embodiment, the tab protection portion 3 is connected to the tab insulation portion 4. Thus, the connection stability between the tab protection portion 3 and the outer tab 2 can be further improved by connecting the tab protection portion 3 to the tab insulation portion 4, and the tab protection portion 3 can be prevented from falling off. In some embodiments, the tab protection portion 3 can be made of the same material as the tab insulation portion 4, so that the tab protection portion 3 and the tab insulation portion 4 can be integrally formed.

[0057] In the present application, the pole ear protection part 3 is covered on the edge of one end of the outer pole ear 2 close to the inner pole ear 1 to isolate the outer pole ear 2 from the pole core 5. Under the protection of the pole ear protection part 3, the burrs of the outer pole ear 2 are prevented from cutting the diaphragm and pole piece of the pole core 5, thereby avoiding causing a short circuit in the pole core.

[0058] Example 3

[0059] See also Figure 2 , Figure 4 and Fig. 9The embodiment of the present application provides a single battery, which includes an inner pole ear 1, an outer pole ear 2, a pole ear protection part 3, a pole core 5 and an aluminum-plastic film shell 6. The pole core 5 and the inner pole ear 1 are located in the aluminum-plastic film shell 6. A part of the outer pole ear 2 is located in the aluminum-plastic film shell 6, and another part of the outer pole ear 2 extends out of the aluminum-plastic film shell 6. The pole ear protection part 3 is located in the aluminum-plastic film shell 6.

[0060] One end of the inner pole ear 1 is connected to the outer pole ear 2, and the other end of the inner pole ear 1 is connected to the pole core 5. The inner pole ear 1 and the outer pole ear 2 are welded by laser welding or ultrasonic welding.

[0061] See also Figure 4 The outer pole lug 2 has a first end surface 21 close to the inner pole lug 1 in its length direction, two opposite surfaces 22 in its thickness direction, and two opposite side surfaces 23 in its width direction.

[0062] Among them, the pole ear protection part 3 is covered on the edge of one end of the outer pole ear 2 close to the inner pole ear 1 to block the outer pole ear 2 from the pole core 5, thereby preventing the burrs of the outer pole ear 2 from cutting the diaphragm and pole piece of the pole core 5 under the protection of the pole ear protection part 3, thereby avoiding causing a short circuit in the pole core 5.

[0063] See also Figure 2 , Figure 4 , Figure 5 and Fig. 9 The tab protection portion 3 covers the first end surface 21 and extends to cover the surface 22. The tab protection portion 3 located on the surface 22 has a dimension H in the thickness direction of the outer tab 2. 1 In this embodiment, the dimension H of the tab protection portion 3 located on the surface 22 in the thickness direction of the outer tab 2 is 1 The distance between the tab protection part 3 and the outer tab 2 is 0.15 mm. This can improve the connection stability between the tab protection part 3 and the outer tab 2, and prevent the tab protection part 3 from falling off. In this embodiment, the tab protection part 3 covers the first end face 21 and the two surfaces 22. In other embodiments, the tab protection part can cover the first end face 21 and one surface 22.

[0064] See also Figure 2 , Figure 4 , Fig. 9 and Fig.10 , the tab protection part 3 also covers the side surface 23. The dimension L of the tab protection part 3 located on the side surface 23 in the length direction of the outer tab 2 is 1 In this embodiment, the dimension L of the tab protection portion 3 located on the side surface 23 in the length direction of the outer tab 2 is 1The distance between the tab protection part 3 and the outer tab 2 is 1.5 mm, thereby further increasing the connection stability between the tab protection part 3 and the outer tab 2 and preventing the tab protection part 3 from falling off.

[0065] See also Figure 2 , Figure 4 , Fig. 9 and Fig.10 , the outer pole ear 2 also includes an arc surface 24. The arc surface 24 is connected between the first end face 21 and the side face 23, and the pole ear protection part 3 also covers the arc surface 24. The radius R of the arc surface 24 is 1.5mm-4mm. This can further increase the connection stability between the pole ear protection part 3 and the outer pole ear 2, and prevent the pole ear protection part 3 from falling off. In this embodiment, the radius R of the arc surface 24 is 2mm. In other embodiments, the outer pole ear 2 may also not include the arc surface 24, that is, the first end face 21 and the side face 23 are directly arranged at an angle.

[0066] See also Fig. 9 and Fig.10 The tab protection portion 3 located on the surface 22 includes two widened portions 31 and a main body portion 32, wherein the main body portion 32 is connected between the two widened portions 31. The dimension L of the widened portion 31 in the length direction of the outer tab 2 is 2 It is larger than the radius R of the arc surface 24 , thereby further increasing the connection stability between the tab protection part 3 and the outer tab 2 and preventing the tab protection part 3 from falling off.

[0067] Table 1 Parameters and test results of Examples 1 to 12

[0068]

[0069] From the data in Table 1, it can be seen that in Examples 8 to 12, the dimension L of the widened portion 31 in the length direction of the outer pole ear 2 is 2 If the radius R is less than or equal to the arc surface 24 , the arc surface 24 of the outer tab 2 after encapsulation will not be completely covered, and there is still a risk of cutting the inner tab 1 .

[0070] From the data in Table 1, it can be seen that in Examples 1 to 7, the dimension L of the widened portion 31 in the length direction of the outer pole ear 2 is 2 The radius R of the arc surface 24 is greater than that of the outer pole ear 2 , and the encapsulation effect of the outer pole ear 2 is better. No end of the outer pole ear 2 is exposed, which can effectively avoid cutting the inner pole ear 1 .

[0071] See also Figure 2 , Figure 4 , Fig. 9 and Fig.10, the tab insulating portion 4 is disposed around the outer periphery of the outer tab 2. Specifically, the tab insulating portion 4 is disposed around the outer periphery of the outer tab 2 in the thickness direction and the outer periphery of the outer tab 2 in the width direction. In this embodiment, the tab protection portion 3 is spaced from the tab insulating portion 4, that is, there is a gap between the tab protection portion 3 and the tab insulating portion 4.

[0072] In the present application, the pole ear protection part 3 is covered on the edge of one end of the outer pole ear 2 close to the inner pole ear 1 to isolate the outer pole ear 2 from the pole core 5. Under the protection of the pole ear protection part 3, the burrs of the outer pole ear 2 are prevented from cutting the diaphragm and pole piece of the pole core 5, thereby avoiding causing a short circuit in the pole core.

[0073] Example 4

[0074] See also Figure 2 , Figure 4 and Fig.11 The embodiment of the present application provides a single battery, which includes an inner pole ear 1, an outer pole ear 2, a pole ear protection part 3, a pole core 5 and an aluminum-plastic film shell 6. The pole core 5 and the inner pole ear 1 are located in the aluminum-plastic film shell 6. A part of the outer pole ear 2 is located in the aluminum-plastic film shell 6, and another part of the outer pole ear 2 extends out of the aluminum-plastic film shell 6. The pole ear protection part 3 is located in the aluminum-plastic film shell 6.

[0075] One end of the inner pole ear 1 is connected to the outer pole ear 2, and the other end of the inner pole ear 1 is connected to the pole core 5. The inner pole ear 1 and the outer pole ear 2 are welded by laser welding or ultrasonic welding.

[0076] See also Figure 4 The outer pole lug 2 has a first end surface 21 close to the inner pole lug 1 in its length direction, two opposite surfaces 22 in its thickness direction, and two opposite side surfaces 23 in its width direction.

[0077] Among them, the pole ear protection part 3 is covered on the edge of one end of the outer pole ear 2 close to the inner pole ear 1 to block the outer pole ear 2 from the pole core 5, thereby preventing the burrs of the outer pole ear 2 from cutting the diaphragm and pole piece of the pole core 5 under the protection of the pole ear protection part 3, thereby avoiding causing a short circuit in the pole core 5.

[0078] See also Figure 2 , Figure 4 , Figure 5 and Fig.11 The tab protection portion 3 covers the first end surface 21 and extends to cover the surface 22. The tab protection portion 3 located on the surface 22 has a dimension H in the thickness direction of the outer tab 2. 1 In this embodiment, the dimension H of the tab protection portion 3 located on the surface 22 in the thickness direction of the outer tab 2 is 1The distance between the tab protection part 3 and the outer tab 2 is 0.15 mm. This can improve the connection stability between the tab protection part 3 and the outer tab 2, and prevent the tab protection part 3 from falling off. In this embodiment, the tab protection part 3 covers the first end face 21 and the two surfaces 22. In other embodiments, the tab protection part can cover the first end face 21 and one surface 22.

[0079] See also Figure 2 , Figure 4 , Fig.11 and Fig.12 , the tab protection part 3 also covers the side surface 23. The dimension L of the tab protection part 3 located on the side surface 23 in the length direction of the outer tab 2 is 1 In this embodiment, the dimension L of the tab protection portion 3 located on the side surface 23 in the length direction of the outer tab 2 is 1 The distance between the tab protection part 3 and the outer tab 2 is 1.5 mm, thereby further increasing the connection stability between the tab protection part 3 and the outer tab 2 and preventing the tab protection part 3 from falling off.

[0080] See also Figure 2 , Figure 4 , Fig.11 and Fig.12 , the outer pole ear 2 also includes an arc surface 24. The arc surface 24 is connected between the first end face 21 and the side face 23, and the pole ear protection part 3 also covers the arc surface 24. The radius R of the arc surface 24 is 1.5mm-4mm. This can further increase the connection stability between the pole ear protection part 3 and the outer pole ear 2, and prevent the pole ear protection part 3 from falling off. In this embodiment, the radius R of the arc surface 24 is 2mm. In other embodiments, the outer pole ear 2 may also not include the arc surface 24, that is, the first end face 21 and the side face 23 are directly arranged at an angle.

[0081] See also Fig.11 and Fig.12 The tab protection part 3 on the surface includes two widened parts 31 and a main body 32, and the main body 32 is connected between the two widened parts 31. The dimension of the widened part 31 in the length direction of the outer tab 2 is greater than the radius R of the arc surface 24, thereby further increasing the connection stability between the tab protection part 3 and the outer tab 2 and preventing the tab protection part 3 from falling off.

[0082] Table 2 Parameters and test results of Examples 13 to 24

[0083]

[0084] From the data in Table 2, it can be seen that in Examples 20 to 24, the dimension L of the widened portion 31 in the length direction of the outer pole ear 2 is 2If the radius R is less than or equal to the arc surface 24 , the arc surface 24 of the outer tab 2 after encapsulation will not be completely covered, and there is still a risk of cutting the inner tab 1 .

[0085] From the data in Table 2, it can be seen that in Examples 13 to 19, the dimension L of the widened portion 31 in the length direction of the outer pole ear 2 is 2 The radius R of the arc surface 24 is greater than that of the outer pole ear 2 , and the encapsulation effect of the outer pole ear 2 is better. No end of the outer pole ear 2 is exposed, which can effectively avoid cutting the inner pole ear 1 .

[0086] See also Figure 2 , Figure 4 , Fig.11 and Fig.12 , the pole lug insulating portion 4 is arranged around the outer periphery of the outer pole lug 2. Specifically, the pole lug insulating portion 4 is arranged around the outer periphery of the outer pole lug 2 in the thickness direction and the outer periphery of the outer pole lug 2 in the width direction. In this embodiment, the pole lug protection portion 3 is connected to the pole lug insulating portion 4. Specifically, the pole lug protection portion 3 and the widened portion 31 located on the side 23 are both connected to the pole lug insulating portion 4, thereby further improving the connection stability between the pole lug protection portion 3 and the outer pole lug 2 by connecting the pole lug protection portion 3 to the pole lug insulating portion 4, and preventing the pole lug protection portion 3 from falling off. In some embodiments, the pole lug protection portion 3 can be made of the same material as the pole lug insulating portion 4, thereby allowing the pole lug protection portion 3 and the pole lug insulating portion 4 to be integrally formed.

[0087] In the present application, the pole ear protection part 3 is covered on the edge of one end of the outer pole ear 2 close to the inner pole ear 1 to isolate the outer pole ear 2 from the pole core 5. Under the protection of the pole ear protection part 3, the burrs of the outer pole ear 2 are prevented from cutting the diaphragm and pole piece of the pole core 5, thereby avoiding causing a short circuit in the pole core.

[0088] Example 5

[0089] The present application also provides a battery pack, which includes the above-mentioned single cell of the pole core. The single cell and the battery pack provided in the present application are provided with a pole ear protection part 3 covering the edge of the outer pole ear 2 close to the inner pole ear 1 so as to isolate the outer pole ear 2 from the pole core 5. Under the protection of the pole ear protection part 3, the burrs of the outer pole ear 2 are prevented from cutting the diaphragm and pole piece of the pole core 5, thereby preventing the pole core 5 from short-circuiting.

[0090] The above is a detailed introduction to a single cell battery and a battery pack provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A single cell battery, characterized in that: include: An inner pole ear, an outer pole ear, a pole ear protection portion and a pole core, one end of the inner pole ear is connected to the outer pole ear, the other end of the inner pole ear is connected to the pole core, and the pole ear protection portion is covered on the edge of the outer pole ear close to one end of the inner pole ear to block the outer pole ear from the pole core.

2. The single cell according to claim 1, characterized in that: The outer pole lug has a first end surface close to the inner pole lug in its length direction, and the outer pole lug has two opposite surfaces in its thickness direction. The pole lug protection portion covers the first end surface and extends to cover the surfaces.

3. The single cell according to claim 2, characterized in that: The dimension of the tab protection portion located on the surface in the thickness direction of the outer tab is 0.1 mm to 0.2 mm.

4. The single cell according to claim 2, characterized in that: The outer tab has two opposite side surfaces in the width direction thereof, and the tab protection portion further covers the side surfaces.

5. The single cell according to claim 4, characterized in that: The outer tab further includes an arc surface, the arc surface is connected between the first end surface and the side surface, and the tab protection portion further covers the arc surface.

6. The single cell according to claim 5, characterized in that: The dimension of the tab protection portion located on the side surface in the length direction of the outer tab is greater than or equal to 1 mm.

7. The single cell according to claim 5, characterized in that: The tab protection portion located on the surface includes two widened portions and a main body portion, wherein the main body portion is connected between the two widened portions.

8. The single cell according to claim 7, characterized in that: The dimension of the widened portion in the length direction of the outer pole ear is greater than the radius of the arc surface.

9. The single cell according to claim 1, characterized in that: The single battery further includes a tab insulating portion, which is disposed around the outer periphery of the outer tab in a thickness direction and the outer periphery of the outer tab in a width direction, and the tab protection portion is connected to the tab insulating portion.

10. A battery pack, characterized in that: A single cell comprising any one of claims 1 to 9.

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