Tab, single battery, battery pack and vehicle

Abstract

The utility model discloses a tab, a single battery, a battery pack and a vehicle, the tab comprises a body, the body is provided with an exhaust passage and a blasting part, a first side of the body is suitable for being connected with a pole core, one end of the exhaust passage penetrates through the first side, and the blasting part seals and covers the other end of the exhaust passage. The tab provided by the embodiment of the utility model has the advantages of simple structure and convenience in processing and manufacturing, and is beneficial to improving the safety of the single battery.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a tab, a single cell, a battery pack and a vehicle. Background Art

[0002] The single cell in the related art is usually equipped with a safety valve. When the single cell experiences thermal runaway, the safety valve can release the pressure of the single cell to prevent the single cell from exploding. However, since the safety valve has a complex structure and many parts, it is not only inconvenient to arrange, but also easily leads to an increased probability of failure of the safety valve, and low safety. Moreover, the safety valve in the related art is usually arranged between the positive electrode ear and the negative electrode ear, which is prone to short circuit and corrosion problems. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a pole ear, which has the advantages of simple structure, easy processing and manufacturing, and is conducive to improving the safety of single cells.

[0004] The utility model also provides a single battery with the above-mentioned pole ear.

[0005] The utility model also provides a battery pack having the above-mentioned single battery.

[0006] The utility model also provides a vehicle with the battery pack.

[0007] In order to achieve the above-mentioned purpose, according to the first aspect embodiment of the utility model, a pole ear is proposed, and the pole ear includes: a main body, the main body is provided with an exhaust channel and a bursting part, the first side of the main body is suitable for connecting with the pole core, one end of the exhaust channel passes through the first side, and the bursting part covers the other end of the exhaust channel.

[0008] The pole ear according to the embodiment of the utility model has the advantages of simple structure and easy processing and manufacturing, and is beneficial to improving the safety of the single battery.

[0009] According to some embodiments of the present invention, the bursting part is arranged on the second side of the main body, and the second side is arranged adjacent to the first side.

[0010] According to some embodiments of the utility model, the exhaust channel includes: a first channel, the bursting part covers one end of the first channel; a second channel, one end of the second channel is connected to the other end of the first channel, and the second channel is bent relative to the first channel, and the other end of the second channel passes through the first side.

[0011] According to some embodiments of the present invention, the second channel includes: a main segment, one end of which is connected to the other end of the first channel; and a plurality of branch segments, one end of which is connected to the other end of the main segment, and the other ends of which pass through the first side.

[0012] According to some embodiments of the present invention, the main body has a center line perpendicular to the first side, and the plurality of branch segments are symmetrically arranged about the center line.

[0013] According to some embodiments of the present invention, the width of the branch segment is smaller than the width of the overall segment.

[0014] According to some embodiments of the present invention, the body includes: a first body, the first body constructs the exhaust channel; a plurality of second bodies, the plurality of second bodies and the first body are stacked, and the plurality of second bodies are arranged on opposite sides of the first body in the thickness direction.

[0015] According to some embodiments of the present invention, the exhaust channel runs through two opposite sides of the first body in a thickness direction, and the thickness of the first body is 0.1 mm to 0.25 mm.

[0016] According to some embodiments of the present invention, the first body includes a plurality of first foils, which are stacked; and / or the second body includes a plurality of second foils, which are stacked.

[0017] According to some embodiments of the present invention, along the exhaust direction of the exhaust passage, the thickness of the bursting portion is 0.03 mm to 0.07 mm.

[0018] According to some embodiments of the present invention, when the force applied to the bursting part reaches a bursting pressure value, the bursting part explodes to release pressure, wherein the bursting pressure value is 0.15MPa to 0.3MPa.

[0019] According to some embodiments of the utility model, the tab further comprises: tab glue, the tab glue is connected to the body and extends along the circumference of the body, and the tab glue and the bursting part are arranged alternately.

[0020] According to the second aspect of the present invention, a single cell is provided, comprising: a pole core; a pole ear according to the first aspect of the present invention, wherein the first side of the pole ear is connected to the pole core; and a packaging shell, wherein the pole core is arranged in the packaging shell, and at least a portion of the pole ear is exposed from the packaging shell.

[0021] The single cell battery described in the second embodiment of the utility model has the advantages of simple structure and easy processing and manufacturing by utilizing the pole ear described in the first embodiment of the utility model, and the safety of the single cell battery is higher.

[0022] According to some embodiments of the present invention, the bursting portion of the tab is located outside the packaging shell.

[0023] According to a third aspect of the present invention, a battery pack is provided. The battery pack includes a single cell according to the second aspect of the present invention.

[0024] The battery pack according to the third aspect of the present invention, by utilizing the single battery according to the second aspect of the present invention, has the advantages of simple structure, easy processing and manufacturing, and high safety.

[0025] According to a fourth aspect of the present invention, a vehicle is provided. The vehicle includes a battery pack according to the third aspect of the present invention.

[0026] The vehicle according to the fourth aspect of the present invention, by utilizing the battery pack according to the third aspect of the present invention, has the advantages of simple structure, easy processing and manufacturing, and high safety.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a schematic structural diagram of a single cell according to an embodiment of the utility model;

[0030] Figure 2 It is a schematic diagram of the connection between the pole ear and the pole core according to an embodiment of the utility model;

[0031] Figure 3 It is a schematic diagram of the structure of the pole ear according to an embodiment of the utility model;

[0032] Figure 4 is a schematic structural diagram of a pole ear according to another perspective of an embodiment of the utility model;

[0033] Figure 5 is an exploded view of a tab according to an embodiment of the utility model;

[0034] Figure 6It is another exploded view of the pole ear according to an embodiment of the utility model.

[0035] Reference numerals:

[0036] 1. Tab; 2. Single cell;

[0037] 100, body; 101, first side; 102, second side; 103, center line; 110, exhaust channel; 111, first channel; 112, second channel; 113, main section; 114, branch section; 120, bursting section; 130, first body; 131, first foil; 140, second body; 141, second foil;

[0038] 200, ear glue;

[0039] 300, pole core; 400, packaging shell. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0043] In the description of the present invention, "multiple" means two or more, and "several" means one or more.

[0044] The electrode tab 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0045] like Figure 1-Figure 6 As shown, the electrode tab 1 according to the embodiment of the present invention includes a body 100 .

[0046] The main body 100 is provided with an exhaust channel 110 and a bursting part 120 . The first side 101 of the main body 100 is suitable for connecting with the pole core 300 . One end of the exhaust channel 110 passes through the first side 101 , and the bursting part 120 covers the other end of the exhaust channel 110 .

[0047] Among them, the electrode tab 1 in the embodiment of the utility model can be a positive electrode tab or a negative electrode tab.

[0048] According to the pole lug 1 of the embodiment of the utility model, the exhaust channel 110 and the bursting part 120 are arranged on the pole lug 1, one end of the exhaust channel 110 passes through the first side 101, and the bursting part 120 covers the other end of the exhaust channel 110. In this way, when the single cell 2 is working normally, the bursting part 120 can isolate the inside of the single cell 2 from the outside, and when the single cell 2 has thermal runaway, the gas generated by the pole core 300 can flow to the bursting part 120 through the exhaust channel 110. When the pressure reaches a certain value, the airflow in the exhaust channel 110 can flush the bursting part 120, and then the pressure can be released outward through the exhaust channel 110, so as to avoid the explosion of the single cell 2 or the battery pack, so as to improve the safety of the single cell 2.

[0049] Moreover, with such an arrangement, there is no need to separately arrange an explosion-proof valve on the single cell 2, which is conducive to simplifying the structure of the single cell 2. Only the exhaust channel 110 is used for pressure relief. The structure of the exhaust channel 110 is simple and there is no need to set up a complex structure. It is relatively convenient to process the exhaust channel 110 on the pole ear 1, and it is not easy to fail.

[0050] Thus, the tab 1 according to the embodiment of the utility model has the advantages of simple structure and easy processing and manufacturing, and is beneficial to improving the safety of the single battery 2.

[0051] In some specific embodiments of the present invention, Figure 2 and Figure 3 As shown, the bursting part 120 is disposed on the second side 102 of the body 100 , and the second side 102 and the first side 101 are adjacently disposed.

[0052] It is understandable that the first side 101 of the body 100 is connected to the pole core 300 , and the side opposite to the first side 101 needs to be connected to the connecting piece, so as to connect multiple single cells 2 in series through the connecting piece.

[0053] In the present embodiment, the bursting part 120 is arranged on the second side 102 which is adjacent to the first side 101, so that the bursting part 120 is not easy to interfere with the position of the connecting piece, that is, the connecting piece will not block the bursting part 120. When thermal runaway occurs in the single cell 2, the airflow in the exhaust channel 110 can flush the bursting part 120 to release the pressure, thereby further improving the safety of the single cell 2 when thermal runaway occurs, and effectively avoiding the explosion of the single cell 2 when thermal runaway occurs.

[0054] In some specific embodiments of the present invention, Figure 2 and Figure 3 As shown, the exhaust passage 110 includes a first passage 111 and a second passage 112 .

[0055] The bursting part 120 covers one end of the first channel 111 , one end of the second channel 112 is connected to the other end of the first channel 111 , and the second channel 112 is bent relative to the first channel 111 , and the other end of the second channel 112 passes through the first side 101 .

[0056] The connection between the first channel 111 and the second channel 112 may be in the form of an arc transition, so as to facilitate the flow of air in the exhaust channel 110 .

[0057] By dividing the exhaust channel 110 into a relatively bent first channel 111 and a second channel 112, it is convenient for the first channel 111 and the second channel 112 to extend to different sides respectively, thereby facilitating the connection between the first channel 111 and the first side 101, and extending the second channel 112 to the blasting part 120, and the structural arrangement is more reasonable.

[0058] Furthermore, if Figure 2 and Figure 3 As shown, the second channel 112 includes a main section 113 and a plurality of branch sections 114 .

[0059] One end of the main segment 113 is connected to the other end of the first channel 111 , one end of the plurality of branch segments 114 is connected to the other end of the main segment 113 , and the other ends of the plurality of branch segments 114 penetrate the first side 101 .

[0060] By setting a plurality of branch segments 114, the other ends of the plurality of branch segments 114 can respectively pass through different positions of the first side 101, and then can be connected with different parts of the pole core 300 through the plurality of branch segments 114. When thermal runaway occurs in the single cell 2, the gas generated at different parts of the pole core 300 can flow to different branch segments 114 for pressure relief, so that the gas generated by the pole core 300 can flow more smoothly and the pressure relief effect is better.

[0061] Moreover, by providing multiple branch segments 114, the gas pressure relief area can be increased. When thermal runaway occurs in the single cell 2, the gas generated by the pole core 300 can be quickly released through the exhaust channel 110, effectively avoiding the explosion of the single cell 2 and providing higher safety.

[0062] In some specific embodiments of the present invention, Figure 2 As shown, the body 100 has a center line 103 perpendicular to the first side 101, and a plurality of branch segments 114 are arranged about the center line 103. In this way, the exhaust of the pole core 300 is more uniform, that is, the gas on both sides of the center line 103 of the body 100 can flow into the branch segments 114 more smoothly, and then can be decompressed outward through the exhaust channel 110, further improving the decompression effect of the exhaust channel 110.

[0063] In some specific embodiments of the present invention, Figure 2 and Figure 3 As shown, the width of the branch segment 114 is smaller than the width of the overall segment 113 .

[0064] For example, the width of each branch segment 114 is smaller than the width of the overall segment 113 , and the overall width of the plurality of branch segments 114 may be equal to the width of the overall segment 113 .

[0065] This arrangement can avoid excessive gas flowing into the multiple branch segments 114, which may cause blockage of the airflow at the connection between the main segment 113 and the branch segment 114, so that when the single cell 2 is in thermal runaway, the gas generated by the pole core 300 can be discharged quickly and smoothly through the exhaust channel 110, further improving the pressure relief efficiency of the single cell 2, effectively avoiding the explosion of the single cell 2 during thermal runaway, and improving safety.

[0066] In some specific embodiments of the present invention, Figure 5 As shown, the body 100 includes a first body 130 and a plurality of second bodies 140 .

[0067] The first body 130 forms the exhaust channel 110, and the plurality of second bodies 140 are stacked with the first body 130, and the plurality of second bodies 140 are arranged on opposite sides of the thickness direction of the first body 130. In this way, the exhaust channel 110 can be constructed only on the first body 130, which facilitates the processing of the exhaust channel 110, and the plurality of second bodies 140 can cover the exhaust channel 110 from opposite sides of the thickness direction of the first body 130.

[0068] The first body 130 may be cut to form the exhaust passage 110 .

[0069] In some specific embodiments of the present invention, the exhaust channel 110 passes through two opposite sides of the first body 130 in the thickness direction, and the thickness of the first body 130 is 0.1 mm to 0.25 mm.

[0070] That is to say, the height of the exhaust channel 110 is 0.1mm~0.25mm. In this way, on the one hand, the thickness of the first body 130 can be avoided from being too thick, and then the thickness of the pole ear 1 can be avoided from being too thick. At the same time, the height of the exhaust channel 110 can be avoided from being too high, that is, the cross-sectional area of ​​the exhaust channel 110 can be avoided from being too large. When the single battery 2 has thermal runaway, the gas generated by the pole core 300 can quickly fill the exhaust channel 110, and then the air pressure in the exhaust channel 110 can rise rapidly to break through the explosion part 120 for pressure relief. On the other hand, the height of the exhaust channel 110 can be avoided from being too low, that is, the cross-sectional area of ​​the exhaust channel 110 can be avoided from being too small, so as to ensure that the exhaust of the exhaust channel 110 can be relatively smooth, and the pressure can be relieved quickly when the single battery 2 has thermal runaway.

[0071] In some specific embodiments of the present invention, Figure 5 As shown, the first body 130 includes a plurality of first foils 131 which are stacked, and the second body 140 includes a plurality of second foils 141 which are stacked.

[0072] The first foil 131 and the second foil 141 may be made of the same material. For example, the first foil 131 and the second foil 141 may both be copper foil or aluminum foil.

[0073] Specifically, the plurality of first foils 131 can be ultrasonically welded to form the first body 130 , the plurality of second foils 141 can be ultrasonically welded to form the second body 140 , and the plurality of first foils 131 and the plurality of second foils 141 can be ultrasonically welded to form an integral tab 1 .

[0074] Therefore, the thickness of the first body 130 can be adjusted by adjusting the number of the first foil materials 131, that is, the height of the exhaust channel 110 can be adjusted, and the thickness of the pole lug 1 can be adjusted by adjusting the number of the first foil materials 131 and the second foil materials 141, so as to facilitate the processing of pole lugs 1 with various thicknesses to adapt to battery packs of different systems or capacities. There is no need to process the pole lug 1 through multiple sets of different molds, and the overall process is simpler, easier to form, and more convenient to process and manufacture.

[0075] Moreover, the thickness of the tab 1 can be adjusted by adjusting the quantity of the first foil 131 and the second foil 141 , so that the thickness of the tab 1 can be precisely controlled, which can save the material cost of the tab 1 and reduce waste while ensuring the high precision of the tab 1 .

[0076] In some specific embodiments of the present invention, along the exhaust direction of the exhaust passage 110 , the thickness of the bursting portion 120 is 0.03 mm to 0.07 mm.

[0077] For example, along the exhaust direction of the exhaust passage 110 , the thickness of the bursting portion 120 may be 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, or 0.07 mm.

[0078] This arrangement can, on the one hand, prevent the thickness of the bursting part 120 from being too thin, so that when the internal and external air pressures of the single cell 2 are relatively small, the bursting part 120 will not be damaged, thereby preventing the bursting part 120 from exploding when the single cell 2 does not have thermal runaway. On the other hand, it can prevent the thickness of the bursting part 120 from being too thick, so that the single cell 2 can break through the bursting part 120 in time when thermal runaway occurs, and then release the pressure in time to prevent the single cell 2 from exploding, thereby achieving higher safety.

[0079] In some specific embodiments of the present invention, Figure 1-Figure 6 As shown, when the force applied to the bursting part 120 reaches a bursting pressure value, the bursting part 120 bursts and releases pressure, wherein the bursting pressure value is 0.15 MPa to 0.3 MPa.

[0080] In this way, on the one hand, it is possible to avoid the explosion pressure value being too small, and when the internal and external air pressures of the single cell 2 are relatively small, the explosion part 120 will not be damaged, thereby avoiding the explosion of the explosion part 120 when the single cell 2 does not have thermal runaway. On the other hand, it is possible to avoid the explosion pressure value being too large, so that the single cell 2 can break through the explosion part 120 in time to release the pressure when thermal runaway occurs, thereby avoiding the explosion of the single cell 2, and having higher safety.

[0081] In some specific embodiments of the present invention, the tab 1 further includes tab glue 200 .

[0082] The tab glue 200 is connected to the body 100 and extends along the circumference of the body 100 , so that the tab glue 200 of the tab 1 can be fused with the glue layer on the packaging shell 400 by heat sealing welding to complete the packaging of the pole core 300 .

[0083] In addition, the ear glue 200 and the bursting part 120 are arranged alternately, so that the ear glue 200 will not cover the bursting part 120, that is, the ear glue 200 will not block the bursting part 120 from bursting, to ensure that when the single battery 2 has thermal runaway, the airflow in the exhaust channel 110 can easily break through the bursting part 120 to release pressure.

[0084] Among them, the exhaust channel 110 can be cut into multiple first foils 131 first, and then the multiple second foils 141 can be cut into required sizes, and then the multiple first foils 131 and the multiple second foils 141 are placed in a high temperature and high pressure environment for ultrasonic welding to form a whole, and finally the pole ear glue 200 is covered on the main body 100 to form a complete pole ear 1.

[0085] The following describes a single cell 2 according to an embodiment of the present utility model with reference to the accompanying drawings. Figure 1 and Figure 2 As shown, the single battery 2 includes a pole core 300 , a pole ear 1 according to the above embodiment of the present utility model, and a packaging shell 400 .

[0086] The first side 101 of the pole tab 1 is connected to the pole core 300, the pole core 300 is arranged in the packaging shell 400, and at least part of the pole tab 1 is exposed from the packaging shell 400, so as to facilitate the electrical connection of the pole tabs 1 of multiple single cells 2, and facilitate pressure relief through the exhaust channel 110 on the pole tab 1 when thermal runaway occurs in the single cell 2.

[0087] The single cell 2 according to the embodiment of the utility model has the advantages of simple structure and easy processing and manufacturing by utilizing the pole ear 1 according to the above embodiment of the utility model, and the single cell 2 has higher safety.

[0088] In some specific embodiments of the present invention, Figure 1 and Figure 2 As shown, the bursting part 120 of the tab 1 is located outside the packaging shell 400, so that the packaging shell 400 will not block the bursting part 120, that is, the packaging shell 400 will not block the bursting part 120 from bursting, so as to ensure that when the single battery 2 has thermal runaway, the airflow in the exhaust channel 110 can easily break through the bursting part 120 to release pressure.

[0089] A battery pack according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The battery pack includes a single battery 2 according to the above embodiment of the present invention.

[0090] The battery pack according to the embodiment of the utility model has the advantages of simple structure, easy processing and manufacturing, high safety, etc. by utilizing the single battery 2 according to the above embodiment of the utility model.

[0091] A vehicle according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The vehicle includes a battery pack according to the above embodiment of the present invention.

[0092] The vehicle according to the embodiment of the utility model has the advantages of simple structure, easy processing and manufacturing, high safety, etc. by utilizing the battery pack according to the above embodiment of the utility model.

[0093] The tab 1, the single cell 2, the battery pack and other structures and operations of the vehicle according to the embodiment of the utility model are well known to ordinary technicians in this field and will not be described in detail here.

[0094] In the description of this specification, the description with reference to the terms "specific embodiment", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0095] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A tab, characterized in that: include: The main body is provided with an exhaust passage and a bursting part, a first side of the main body is suitable for connecting with the pole core, one end of the exhaust passage passes through the first side, and the bursting part covers the other end of the exhaust passage.

2. The tab according to claim 1, characterized in that: The bursting part is arranged on the second side of the body, and the second side is arranged adjacent to the first side.

3. The tab according to claim 2, characterized in that: The exhaust passage comprises: a first channel, wherein the bursting part covers one end of the first channel; A second channel, one end of the second channel is connected to the other end of the first channel, the second channel is bent relative to the first channel, and the other end of the second channel passes through the first side.

4. The tab according to claim 3, characterized in that: The second channel comprises: a main section, one end of which is connected to the other end of the first channel; A plurality of branch segments, one end of the plurality of branch segments is connected to the other end of the main segment, and the other end of the plurality of branch segments passes through the first side.

5. The electrode tab according to claim 4, characterized in that: The body has a center line perpendicular to the first side, and the plurality of branch segments are symmetrically arranged about the center line.

6. The tab according to claim 4, characterized in that: The width of the branch segment is smaller than the width of the overall segment.

7. The tab according to claim 1, characterized in that: The body comprises: a first body, wherein the first body configures the exhaust passage; A plurality of second bodies are stacked with the first body, and the plurality of second bodies are arranged on opposite sides of the first body in a thickness direction.

8. The electrode tab according to claim 7, characterized in that: The exhaust channel passes through two opposite sides of the first body in a thickness direction, and the thickness of the first body is 0.1 mm to 0.25 mm.

9. The electrode tab according to claim 7, characterized in that: The first body comprises a plurality of first foils, and the plurality of first foils are stacked; and / or The second body includes a plurality of second foils, and the plurality of second foils are stacked.

10. The tab according to claim 1, characterized in that: Along the exhaust direction of the exhaust passage, the thickness of the burst portion is 0.03 mm to 0.07 mm.

11. The tab according to claim 1, characterized in that: When the force applied to the bursting part reaches a bursting pressure value, the bursting part explodes to release pressure, wherein the bursting pressure value is 0.15MPa to 0.3MPa.

12. The tab according to claim 1, characterized in that: Also includes: The tab glue is connected to the body and extends along the circumference of the body. The tab glue and the bursting part are arranged alternately.

13. A single cell battery, characterized in that: include: Pole core; The pole lug according to any one of claims 1 to 12, wherein the first side of the pole lug is connected to the pole core; A packaging shell, wherein the pole core is arranged in the packaging shell, and at least a portion of the pole ear is exposed from the packaging shell.

14. The single cell according to claim 13, characterized in that: The bursting portion of the tab is located outside the packaging shell.

15. A battery pack, characterized in that: Comprising the single cell according to claim 13 or 14.

16. A vehicle, characterized in that: Comprising the battery pack according to claim 15.

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