Pole, battery cell and battery module

Abstract

The utility model provides a pole, a battery cell and a battery module, and relates to the field of battery cell structures. A first cylindrical section, a second cylindrical section and a third cylindrical section which are connected in sequence are formed on the pole along the axis direction of the pole, and the diameters of the first cylindrical section and the third cylindrical section are greater than the diameter of the second cylindrical section, so that the pole forms a fusing part at the second cylindrical section. A first cylindrical section, a second cylindrical section and a third cylindrical section which are sequentially connected are formed on the pole along the axis direction of the pole, and the diameter of the first cylindrical section and the diameter of the third cylindrical section are both larger than that of the second cylindrical section, so that the pole forms a fusing part at the second cylindrical section. Therefore, when the temperature of the battery cell is too high (namely, the battery cell is in thermal runaway), the second cylindrical section can be fused in time due to the small diameter, so that the positive electrode and the negative electrode of the adjacent battery cell can be disconnected in time, and the use safety of the battery cell is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery cell structures, and in particular to a pole, a battery cell and a battery module. Background Art

[0002] Due to the structural limitations of the current large cylindrical battery cells, when the temperature of the battery cell is too high, the positive and negative poles of the cylindrical battery cell cannot be disconnected in time, which will cause the safety factor of the battery cell to decrease. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a pole, a battery cell and a battery module to solve the problem that when the temperature of the existing large cylindrical battery cell is too high, the positive and negative electrodes cannot be disconnected in time, resulting in a decrease in the safety factor of the battery cell.

[0004] According to the above-mentioned purpose, the first aspect of the utility model provides a pole, wherein along the axial direction of the pole, the pole is formed with a first cylindrical segment, a second cylindrical segment and a third cylindrical segment connected in sequence, and the diameters of the first cylindrical segment and the third cylindrical segment are both larger than the diameter of the second cylindrical segment, so that the pole is formed as a fuse portion at the second cylindrical segment.

[0005] Preferably, along the axial direction of the pole, the length of the pole is 4 mm to 5 mm.

[0006] Preferably, the first cylindrical segment is located at the first end of the pole in the axial direction, and along the axial direction of the pole, the length of the first cylindrical segment is 1.5 mm to 2.5 mm.

[0007] Preferably, the diameter of the first cylindrical section is 3.9 mm to 5 mm.

[0008] Preferably, the second cylindrical segment is located in the middle of the pole axis direction, and along the pole axis direction, the length of the second cylindrical segment is 0.1 mm to 0.2 mm.

[0009] Preferably, the diameter of the second cylindrical segment is 1.5 mm to 1.8 mm; or, the diameter of the second cylindrical segment is 2 mm to 2.5 mm. When the diameter of the second cylindrical segment is 2 mm to 2.5 mm, a thermosensitive layer is formed on the outer surface of the second cylindrical segment.

[0010] Preferably, the third cylindrical segment is located at the second end of the pole in the axial direction, and along the axial direction of the pole, the length of the third cylindrical segment is 1.5 mm to 2.5 mm.

[0011] Preferably, the diameter of the third cylindrical segment is 3.9 mm to 5 mm.

[0012] According to a second aspect of the utility model, a battery cell is provided, wherein the battery cell is formed as a cylindrical battery cell, and the cylindrical battery cell includes the pole as described above.

[0013] According to a third aspect of the present invention, a battery module is provided, wherein the battery module comprises a plurality of battery cells as described above.

[0014] According to the pole, battery cell and battery module of the utility model, the pole is formed with a first cylindrical section, a second cylindrical section and a third cylindrical section connected in sequence along its axial direction, and the diameters of the first cylindrical section and the third cylindrical section are both larger than the diameter of the second cylindrical section, so that the pole is formed as a fuse at the second cylindrical section. In this way, when the temperature of the battery cell is too high (i.e., in thermal runaway), the second cylindrical section can be fused in time due to its small diameter, and then the positive and negative electrodes of the adjacent battery cells can be disconnected in time, which effectively improves the safety of the battery cell.

[0015] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of a pole according to an embodiment of the utility model.

[0018] Icon: 1-pole; 11-first cylindrical segment; 12-second cylindrical segment; 13-third cylindrical segment. DETAILED DESCRIPTION

[0019] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0020] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0021] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0022] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0023] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0024] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0025] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0026] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0027] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0028] like Figure 1 As shown, according to the first aspect of the utility model, a pole 1 is provided, which is formed into a columnar structure with an axis, and includes a first cylindrical section 11, a second cylindrical section 12 and a third cylindrical section 13, and the diameter of the second cylindrical section 12 is smaller than that of the first cylindrical section 11 and the third cylindrical section 13, so that the pole 1 is formed as a fuse part (i.e., a structural weak point of the entire pole 1) at the second cylindrical section 12, that is, from the overall structure of the pole 1, the outer side wall of the pole 1 is formed with an annular groove, so that the pole 1 is easy to fuse at high temperature. In the following, the specific structure of the above-mentioned parts of the pole 1 according to the utility model will be described in detail.

[0029] In this embodiment, the first cylindrical segment 11, the second cylindrical segment 12 and the third cylindrical segment 13 are connected in sequence. Along the axial direction of the pole 1, the overall length of the pole 1 is 4mm to 5mm. Specifically, the first cylindrical segment 11 is located at the first end of the axial direction of the pole 1, and the third cylindrical segment 13 is located at the second end of the axial direction of the pole 1, and along the axial direction of the pole 1, the length of the first cylindrical segment 11 is 1.5mm to 2.5mm, and the length of the third cylindrical segment 13 is also 1.5mm to 2.5mm. More specifically, in this embodiment, the diameter of the first cylindrical segment 11 is 3.9mm to 5mm, and the diameter of the third cylindrical segment 13 is also 3.9mm to 5mm.

[0030] Furthermore, the second cylindrical segment 12 is located in the middle of the axial direction of the pole 1, that is, the second cylindrical segment 12 is located between the first cylindrical segment 11 and the third cylindrical segment 13, and along the axial direction of the pole 1, the length of the second cylindrical segment 12 is 0.1 mm to 0.2 mm.

[0031] Furthermore, in the first embodiment of the present embodiment, the diameter of the second cylindrical segment 12 is 1.5 mm to 1.8 mm, so that there is a large difference between the diameter of the second cylindrical segment 12 and the diameters of the first cylindrical segment 11 and the third cylindrical segment 13. Therefore, when the battery cell undergoes thermal runaway and the battery cell temperature is too high, the second cylindrical segment 12 with a smaller diameter of the pole 1 is the weakest position of the entire pole 1, so that it can be blown in time, thereby disconnecting the connection between the positive and negative poles of the battery cell.

[0032] Alternatively, in the second embodiment of the present embodiment, the diameter of the second cylindrical segment 12 can be 2mm to 2.5mm. At this time, the diameter of the second cylindrical segment 12 is larger than the diameter of the second cylindrical segment 12 in the first embodiment above. In order to facilitate the fusing of the second cylindrical segment 12, a thermosensitive material is coated on the outer surface of the second cylindrical segment 12 to form a thermosensitive layer. By setting the thermosensitive layer, the resistance at the second cylindrical segment 12 can be increased, so that more heat can be generated to promote the fusing of the second cylindrical segment 12. Specifically, under normal temperature and low temperature conditions (i.e., the temperature is -40°C to 60°C), the internal resistance at the second cylindrical segment 12 does not change, and when the battery cell has thermal runaway, the internal resistance at the second cylindrical segment 12 rises rapidly, and a large amount of heat can be generated to cause the second cylindrical segment 12 to fuse rapidly.

[0033] According to the pole of the utility model, the pole 1 is formed with a first cylindrical section 11, a second cylindrical section 12 and a third cylindrical section 13 connected in sequence along its axial direction, and the diameters of the first cylindrical section 11 and the third cylindrical section 13 are both larger than the diameter of the second cylindrical section 12, so that the pole 1 forms a fuse at the second cylindrical section 12. In this way, when the temperature of the battery cell is too high (i.e., in thermal runaway), the second cylindrical section 12 can be fused in time due to its small diameter, and then the positive and negative electrodes of the adjacent battery cells can be disconnected in time, which effectively improves the safety of the battery cell.

[0034] According to a second aspect of the utility model, a battery cell is provided, wherein the battery cell is formed as a cylindrical battery cell, and the cylindrical battery cell includes the pole 1 as described above.

[0035] According to a third aspect of the present invention, a battery module is provided, wherein the battery module comprises a plurality of battery cells as described above.

[0036] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A pole, characterized in that: Along the axial direction of the pole, the pole is formed with a first cylindrical segment, a second cylindrical segment and a third cylindrical segment connected in sequence, and the diameters of the first cylindrical segment and the third cylindrical segment are both larger than the diameter of the second cylindrical segment, so that the pole is formed as a fuse portion at the second cylindrical segment.

2. The pole according to claim 1, characterized in that: Along the axial direction of the pole, the length of the pole is 4 mm to 5 mm.

3. The pole according to claim 2, characterized in that: The first cylindrical segment is located at a first end of the pole in the axial direction, and along the axial direction of the pole, the length of the first cylindrical segment is 1.5 mm to 2.5 mm.

4. The pole according to claim 3, characterized in that: The diameter of the first cylindrical section is 3.9 mm to 5 mm.

5. The pole according to claim 2, characterized in that: The second cylindrical section is located in the middle of the pole axis direction, and along the pole axis direction, the length of the second cylindrical section is 0.1 mm to 0.2 mm.

6. The pole according to claim 5, characterized in that: The diameter of the second cylindrical segment is 1.5 mm to 1.8 mm; or the diameter of the second cylindrical segment is 2 mm to 2.5 mm. When the diameter of the second cylindrical segment is 2 mm to 2.5 mm, a thermosensitive layer is formed on the outer surface of the second cylindrical segment.

7. The pole according to claim 2, characterized in that: The third cylindrical segment is located at the second end of the pole in the axial direction, and along the axial direction of the pole, the length of the third cylindrical segment is 1.5 mm to 2.5 mm.

8. The pole according to claim 7, characterized in that: The diameter of the third cylindrical section is 3.9 mm to 5 mm.

9. A battery cell, characterized in that: The battery cell is formed as a cylindrical battery cell, and the cylindrical battery cell includes the pole according to any one of claims 1 to 8.

10. A battery module, characterized in that: The battery module comprises a plurality of battery cells as claimed in claim 9.

Images