CN218896791U - Conductive connection assembly and battery thereof - Google Patents
Conductive connection assembly and battery thereof Download PDFInfo
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- CN218896791U CN218896791U CN202223601694.3U CN202223601694U CN218896791U CN 218896791 U CN218896791 U CN 218896791U CN 202223601694 U CN202223601694 U CN 202223601694U CN 218896791 U CN218896791 U CN 218896791U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a conductive connection assembly and a battery thereof, wherein the conductive connection assembly comprises: a first conductive connecting piece; a second conductive connecting piece; the safety part is arranged between the first conductive connecting sheet and the second conductive connecting sheet, one end of the safety part is connected with the first conductive connecting sheet, and the other end of the safety part is connected with the second conductive connecting sheet; the protective sleeve is arranged on the first conductive connecting sheet and the second conductive connecting sheet and covers the safety part, a cavity is formed in the protective sleeve, and a gap is formed between the circumferential cavity wall of the cavity and the safety part. The conductive connection assembly of the present utility model has redundant space to store splashed beads.
Description
Technical Field
The utility model belongs to the technical field of batteries, and particularly relates to a conductive connecting assembly and a battery thereof.
Background
As a structural member for connecting the positive pole post and the positive pole lug of the lithium ion battery, the positive pole connecting sheet not only has the function of connecting and guiding, but also is often endowed with the function of protecting the battery core and related products from thermal runaway due to external short circuit. When an external short circuit occurs, a loop is formed between the positive electrode and the negative electrode. If the external resistance is small, the formed loop current is large, a large amount of heat can be generated in a short time, and the heat can be transferred into the battery cell, so that problems such as positive electrode material decomposition, electrolyte decomposition and diaphragm shrinkage are caused, and finally thermal runaway is caused. Fuse design on aluminum positive tab will preferentially blow when external short circuit occurs, cutting off current loop and heat transfer, preventing thermal runaway. However, the fuse is blown to generate the splash of the molten beads, if the molten beads splash to the inside of the pole group, the short circuit in the battery core is caused, and the thermal runaway is caused. Therefore, it is important to avoid secondary damage caused by the splash of the molten beads generated in the fuse fusing process.
At present, in the prior art, a protective sleeve made of PP material and an aluminum positive electrode connecting sheet are tightly compounded at a fuse through a thermal compounding mode, and a splash bead is stored in the middle of the protective sleeve without redundant space.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, an objective of the present utility model is to provide a conductive connection assembly, so as to solve the technical problem that no redundant space exists in the protective sleeve to store splashed beads in the prior art.
The utility model also aims to provide a battery for applying the conductive connecting assembly.
According to an embodiment of the utility model, a conductive connection assembly includes: a first conductive connecting piece; a second conductive connecting piece; the safety part is arranged between the first conductive connecting sheet and the second conductive connecting sheet, one end of the safety part is connected with the first conductive connecting sheet, and the other end of the safety part is connected with the second conductive connecting sheet; the protective sleeve is arranged on the first conductive connecting sheet and the second conductive connecting sheet and covers the safety part, a cavity is formed in the protective sleeve, and a gap is formed between the circumferential cavity wall of the cavity and the safety part.
According to the conductive connecting assembly provided by the embodiment of the utility model, the protective sleeve is arranged on the first conductive connecting sheet and the second conductive connecting sheet and covers the safety part, meanwhile, the cavity is formed in the protective sleeve, and a gap is formed between the circumferential cavity wall of the cavity and the safety part, so that the conductive connecting assembly has redundant space for storing splashed beads.
In some embodiments, the cavity has a height of 0.1mm to 10mm.
In some embodiments, the protective sleeve comprises: a first protection body; the connecting layers are arranged at two ends of the first protection body in the length direction; the second protection body is arranged on one side of the connecting layer, which is far away from the first protection body; wherein the first protective body, the second protective body and the connection layer define the cavity.
In some embodiments, the material of the connection layer is polypropylene.
In some embodiments, the material of the first protection body and the second protection body is mica or ceramic.
In some embodiments, the widths of the first protection body and the second protection body are 0.5 mm-10 mm; and/or the thickness of the first protection body and the second protection body is 0.5 mm-5 mm.
In some embodiments, the tie layer has a thickness of 0.1mm to 10mm.
In some embodiments, the first protective body and the first conductive connecting piece are adhesively connected; and/or the second protection body is connected with the second conductive connecting sheet in an adhesive way.
In some embodiments, the materials of the first conductive connecting piece and the second conductive connecting piece are aluminum alloy.
A battery according to an embodiment of the present utility model includes: a tab and a post; the conductive connecting assembly is characterized in that the first conductive connecting sheet is electrically connected with the tab, and the second conductive connecting sheet is electrically connected with the pole. Thereby, the safety performance of the battery is improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a conductive connection assembly according to one embodiment of the present utility model;
figure 2 is a schematic view of the structure of a protective sheath according to one embodiment of the present utility model.
Reference numerals:
100. a conductive connection assembly;
10. a first conductive connecting piece;
20. a second conductive connecting piece;
30. a protective sleeve; 301. a first protection body; 302. a connection layer; 303. the second protection body; 304. a cavity.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Referring now to fig. 1-2, a conductive connection assembly 100 in accordance with an embodiment of the present utility model is described.
As shown in fig. 1, a conductive connection assembly 100 according to an embodiment of the present utility model includes: the first conductive connecting piece 10, the second conductive connecting piece 20 and a safety part (not shown in the figure), wherein the safety part is arranged between the first conductive connecting piece 10 and the second conductive connecting piece 20, one end of the safety part is connected with the first conductive connecting piece 10, and the other end of the safety part is connected with the second conductive connecting piece 20; the protective sleeve 30, the protective sleeve 30 is set up on first conductive connection piece 10 and second conductive connection piece 20 to cover the insurance portion, the inside of protective sleeve 30 is formed with cavity 304, is equipped with the clearance between circumference chamber wall and the insurance portion of cavity 304.
It can be understood that the protective sleeve and the positive electrode connecting sheet in the prior art are tightly compounded, and when the safety part is fused, no redundant space is reserved in the protective sleeve for storing splashed beads. The cavity 304 is formed in the protective sleeve 30, so that the safety part is positioned in the cavity 304 and is not in direct contact with the first conductive connecting sheet 10 and the second conductive connecting sheet 20, but a gap is formed between the safety part and the cavity 304, and when the safety part is fused, a space for storing the splashed molten beads generated after fusing is formed in the protective sleeve 30. Specifically, the fuse may be a fuse.
According to the conductive connection assembly 100 of the embodiment of the present utility model, the protective sleeve 30 is disposed on the first conductive connection piece 10 and the second conductive connection piece 20 and covers the safety portion, meanwhile, the cavity 304 is formed in the protective sleeve 30, and a gap is formed between the circumferential cavity wall of the cavity 304 and the safety portion, so that the conductive connection assembly 100 has an excessive space for storing splashed beads.
In some embodiments, the height of the cavity 304 is 0.1mm to 10mm. It will be appreciated that the cavity 304 has a height in the range of 0.1mm to 10mm, which is advantageous for storing splashed beads. The height of the cavity 304 may be any value within a range of 0.1mm to 10mm, and may be, for example, 0.1mm, 1mm, 5mm, 10mm, or the like.
In some embodiments, referring to fig. 2, protective sleeve 30 comprises: the first protection body 301, the connection layer 302, and the second protection body 303, the connection layer 302 being provided at both ends of the first protection body 301 in the length direction; the second protective body 303 is provided on a side of the connection layer 302 remote from the first protective body 301; wherein the first protective body 301, the second protective body 303 and the connection layer 302 define a cavity 304. It will be appreciated that the protective sleeve 30 includes three parts, and the connecting layer 302 connects the first protective body 301 and the second protective body 303 to form the protective sleeve 30, thereby increasing manufacturability of the protective sleeve 30 and reducing difficulty in compounding the protective sleeve 30 with the first conductive connecting piece 10 and the second conductive connecting piece 20.
In some embodiments, the material of the connection layer 302 is polypropylene. It will be appreciated that by using polypropylene as the material of the connection layer 302, the difficulty of compounding the protective sheath 30 with the first conductive tab 10 and the second conductive tab 20 is reduced.
In some embodiments, the first protective body 301 and the second protective body 303 are made of mica or ceramic. It can be understood that the melting point of mica or ceramic is larger than 1000 ℃, the mica or ceramic can not be melted in a short time when the safety part reaches the fusing temperature (660 ℃), the molten beads are prevented from splashing, the thermal runaway probability caused by the molten beads at the safety part is reduced, and the passing rate of the external short circuit test of the battery cell is improved.
In some embodiments, the first protective body 301 and the second protective body 303 each have a width of 0.5mm to 10mm and a thickness of 0.5mm to 5mm. The width may be any value within the range of 0.5mm to 10mm, for example, 0.5mm, 1mm, 5mm, 10mm, or the like; the thickness may be any value within the range of 0.5mm to 5mm, for example, 0.5mm, 1mm, 5mm, or the like.
In some embodiments, the thickness of the tie layer 302 is 0.1mm to 10mm. The thickness of the connection layer 302 may be any value within a range of 0.1mm to 10mm, and may be, for example, 0.1mm, 1mm, 5mm, 10mm, or the like.
In some embodiments, the first protective body 301 and the first conductive connecting piece 10 are adhesively connected, and the second protective body 303 and the second conductive connecting piece 20 are adhesively connected. It should be noted that the gluing mode is relatively convenient and fast, but is not limited to this combination mode, and one skilled in the art can select according to actual needs.
In some embodiments, the materials of the first conductive connecting piece 10 and the second conductive connecting piece 20 are aluminum alloy. Further, the materials of the first conductive connecting piece 10 and the second conductive connecting piece 20 are preferably AL 3003.
A battery according to an embodiment of the present utility model includes: the positive electrode tab, the positive electrode post and the conductive connection assembly 100 described above, wherein the first conductive connection piece 10 is electrically connected to the positive electrode tab, and the second conductive connection piece 20 is electrically connected to the positive electrode post. Thereby, the safety performance of the battery is improved.
One specific embodiment of the conductive connection assembly 100 of the present utility model is described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the conductive connection assembly 100 includes: the first conductive connecting piece 10, the second conductive connecting piece 20, the fuse and the protective sleeve 30.
The fuse is arranged between the first conductive connecting sheet 10 and the second conductive connecting sheet 20, one end of the fuse is connected with the first conductive connecting sheet 10, and the other end of the fuse is connected with the second conductive connecting sheet 20; the protective sleeve 30 is disposed on the first conductive connecting piece 10 and the second conductive connecting piece 20 and covers the fuse, a cavity 304 is formed in the protective sleeve 30, and a gap is formed between the circumferential cavity wall of the cavity 304 and the fuse. The height of the cavity 304 is 3mm.
The protective sheath 30 includes a first protective body 301, a connection layer 302, and a second protective body 303. The connection layers 302 are provided at both ends of the first protection body 301 in the length direction; the second protective body 303 is provided on a side of the connection layer 302 remote from the first protective body 301; wherein the first protective body 301, the second protective body 303 and the connection layer 302 define a cavity 304. The material of the connection layer 302 is polypropylene. The first protection body 301 and the second protection body 303 are made of ceramics. The first protective body 301 and the second protective body 303 are each 5mm in width and 3mm in thickness. The thickness of the connection layer 302 is 3mm. The first protective body 301 is adhesively connected to the first conductive connecting piece 10, and the second protective body 303 is adhesively connected to the second conductive connecting piece 20. The first conductive connecting piece 10 and the second conductive connecting piece 20 are made of aluminum alloy.
A battery according to an embodiment of the present utility model includes: the positive electrode tab, the positive electrode post and the conductive connection assembly 100 described above, wherein the first conductive connection piece 10 is electrically connected to the positive electrode tab, and the second conductive connection piece 20 is electrically connected to the positive electrode post.
The utility model will now be described with reference to specific examples, which are intended to be illustrative only and not limiting in any way.
Considering the actual service condition of the four-pole group VDA type battery cell positive electrode connecting pieces, 2 positive electrode connecting pieces are connected in parallel to carry out constant current short circuit test, the fuse fusing time is recorded, and the fuse splash condition is monitored by a high-speed camera. The connecting pieces of the PP material protective sleeve, the connecting pieces of the ceramic protective sleeve, the connecting pieces of the mica protective sleeve and the connecting pieces without the protective sleeve are respectively named as a connecting piece A, a connecting piece B, a connecting piece C and a connecting piece D. And the square laminated battery core is prepared by taking the connecting sheet A, the connecting sheet B, the connecting sheet C and the connecting sheet D as connecting sheets.
Example 1
Respectively taking 3 groups of connecting sheets A, respectively applying 1200A, 1500A and 2000A direct current, recording average fusing time, and monitoring the splashing amount of the fused beads in the fusing process by using a high-speed camera;
and taking the connecting sheet A as an anode connecting sheet, welding one end of the connecting sheet with the cover plate pole column by adopting a laser welding process, welding the other end of the connecting sheet with the pole group pole lug, and preparing the battery core A through an assembling and forming process.
Example 2
Respectively taking 3 groups of connecting sheets B, respectively applying 1200A, 1500A and 2000A direct current, recording average fusing time, and monitoring the splashing amount of the fused beads in the fusing process by using a high-speed camera;
and taking the connecting sheet B as a positive electrode connecting sheet, welding one end of the connecting sheet with a cover plate pole post by adopting a laser welding process, welding the other end of the connecting sheet with a pole group pole lug, and preparing the battery core B through an assembling and forming process.
Example 3
Respectively taking 3 groups of connecting sheets C, respectively applying 1200A, 1500A and 2000A direct current, recording average fusing time, and monitoring the splashing amount of the fused beads in the fusing process by using a high-speed camera;
and taking the connecting sheet C as an anode connecting sheet, welding one end of the connecting sheet with the cover plate pole column by adopting a laser welding process, welding the other end of the connecting sheet with the pole group pole lug, and preparing the battery core C through an assembling and forming process.
Comparative example 1
Respectively taking 3 groups of connecting sheets D, respectively applying 1200A, 1500A and 2000A direct current, recording average fusing time, and monitoring the splashing amount of the fused beads in the fusing process by using a high-speed camera;
and taking the connecting sheet D as a positive electrode connecting sheet, welding one end of the connecting sheet with the cover plate pole post by adopting a laser welding process, welding the other end of the connecting sheet with the pole group pole lug, and preparing the battery core D through an assembling and forming process.
The positive electrode tabs of examples 1 to 3 and comparative example 1 were used as test subjects, and the short-circuit time and the amount of beads were measured, and the amount of beads was classified into four classes I, ii, iii, and iv from as small as possible, and the measurement results are shown in table 1.
TABLE 1 results of testing the time to fuse and the number of beads
Comparative examples 1 to 3 and comparative example 1 were found that the fusing time was shortened as the direct current was increased, but the fusing time was substantially not different between examples and comparative examples, indicating that the fusing time of the fuse was not affected by the material of the protective case; however, compared with sample D, the number of the fused beads of sample A, B, C is reduced to different degrees, and the fused beads under the conditions of 1200A/1500A/2000A are sample D > sample A (about sample B (about sample C)), so that the fused bead splashing can be reduced under the condition that fuse fusing is not affected by the fuse protection sleeve made of mica/ceramic materials.
The batteries prepared in examples 1 to 3 and comparative example 1 were used as experimental subjects, and were externally connected to an external short circuit test of 5mΩ resistance test, 50 tests each, and the statistical thermal runaway probability was calculated, and the results are shown in table 2.
TABLE 2 results of external short circuit test of cells
| Cell type | Test cell number/EA | Uncontrolled cell count/EA | Run-away rate/% |
| Cell A | 50 | 4 | 8％ |
| Cell B | 50 | 2 | 4％ |
| Cell C | 50 | 0 | 0％ |
| Cell D | 50 | 0 | 0％ |
Comparative examples 1-3 and comparative example 1 found that when the battery using the ceramic protective sleeve connecting piece was subjected to an external short circuit test, the thermal runaway probability was significantly reduced, which proves that the ceramic fuse protective sleeve can effectively slow down the splashing of the beads, and further reduce the internal thermal runaway of the battery core caused by the splashing of the beads.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (10)
1. A conductive connection assembly, comprising:
a first conductive connecting piece (10);
a second conductive connecting piece (20);
a safety part which is arranged between the first conductive connecting sheet (10) and the second conductive connecting sheet (20), one end of the safety part is connected with the first conductive connecting sheet (10), and the other end is connected with the second conductive connecting sheet (20);
the protective sleeve (30), protective sleeve (30) are established on first conductive connection piece (10) with second conductive connection piece (20), and cover insurance portion, the inside of protective sleeve (30) is formed with cavity (304), the circumference cavity wall of cavity (304) with be equipped with the clearance between the insurance portion.
2. The electrical connection assembly of claim 1, wherein the cavity (304) has a height of 0.1mm to 10mm.
3. The electrical connection assembly according to claim 1, wherein the protective sleeve (30) comprises:
a first protective body (301);
a connection layer (302), wherein the connection layer (302) is arranged at two ends of the first protection body (301) in the length direction;
-a second protection body (303), said second protection body (303) being provided on a side of said connection layer (302) remote from said first protection body (301);
wherein the first protective body (301), the second protective body (303) and the connection layer (302) define the cavity (304).
4. A conductive connection assembly according to claim 3, wherein the material of the connection layer (302) is polypropylene.
5. A conductive connection assembly according to claim 3, wherein the material of the first protective body (301) and the second protective body (303) is mica or ceramic.
6. A conductive connection assembly according to claim 3, wherein the first protective body (301) and the second protective body (303) each have a width of 0.5mm to 10mm;
and/or the thickness of the first protection body (301) and the second protection body (303) is 0.5 mm-5 mm.
7. A conductive connection assembly according to claim 3, characterized in that the thickness of the connection layer (302) is 0.1 mm-10 mm.
8. A conductive connection assembly according to claim 3, characterized in that the first protective body (301) and the first conductive connection pad (10) are adhesively connected;
and/or the second protective body (303) and the second conductive connecting sheet (20) are connected by gluing.
9. The conductive connection assembly according to claim 1, wherein the material of the first conductive connection piece (10) and the second conductive connection piece (20) is an aluminum alloy.
10. A battery, comprising:
a tab and a post;
the electrically conductive connection assembly of any one of claims 1-9, wherein the first electrically conductive connection tab (10) is electrically connected to the tab and the second electrically conductive connection tab (20) is electrically connected to the post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223601694.3U CN218896791U (en) | 2022-12-29 | 2022-12-29 | Conductive connection assembly and battery thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223601694.3U CN218896791U (en) | 2022-12-29 | 2022-12-29 | Conductive connection assembly and battery thereof |
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| Publication Number | Publication Date |
|---|---|
| CN218896791U true CN218896791U (en) | 2023-04-21 |
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| CN202223601694.3U Active CN218896791U (en) | 2022-12-29 | 2022-12-29 | Conductive connection assembly and battery thereof |
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| CN (1) | CN218896791U (en) |
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