CN216719989U - Full utmost point ear book core rubberizing structure and electricity core - Google Patents
Full utmost point ear book core rubberizing structure and electricity core Download PDFInfo
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- CN216719989U CN216719989U CN202123159010.4U CN202123159010U CN216719989U CN 216719989 U CN216719989 U CN 216719989U CN 202123159010 U CN202123159010 U CN 202123159010U CN 216719989 U CN216719989 U CN 216719989U
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- 230000005611 electricity Effects 0.000 title description 2
- 238000004804 winding Methods 0.000 claims abstract description 68
- 239000002390 adhesive tape Substances 0.000 claims abstract description 25
- 239000002313 adhesive film Substances 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 16
- 235000015110 jellies Nutrition 0.000 claims description 5
- 239000008274 jelly Substances 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 239000003522 acrylic cement Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 20
- 239000000463 material Substances 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 206010027146 Melanoderma Diseases 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model provides a full-lug winding core rubberizing structure and a battery core, wherein the full-lug winding core rubberizing structure comprises: the winding core is provided with a central shaft and comprises a first pole piece, a second pole piece and a first diaphragm positioned between the first pole piece and the second pole piece; the first pole piece comprises a first active area and a first pole ear area connected with the first active area, the second pole piece comprises a second active area and a second pole ear area connected with the second active area, the first pole ear area is positioned on one side of the first active area along the central axis, and the second pole ear area is positioned on the other side of the second active area along the central axis; and the first adhesive tape is arranged at the junction of the second active area and the first pole lug area in a surrounding way around the central shaft and covers a part of the second active area and a part of the first pole lug area. The full-lug winding core rubberizing structure can reduce the distance between the first active area and the second active area, and prevent the side edge of the second active area from contacting electrolyte, so that the reliability is improved.
Description
Technical Field
The utility model relates to the technical field of power batteries, in particular to a full-lug winding core rubberizing structure.
Background
In recent years, the power battery technology has been rapidly developed, and people have made higher demands on the power performance while continuously pursuing cruising ability. The excellent power characteristics require that the lithium ions have rapid repeated deintercalation capability between the positive and negative electrodes. In order to achieve better power characteristics, in the actual manufacturing process of the battery cell, on one hand, the rapid transmission capability of lithium ions can be realized by properly reducing the coating thickness of the pole piece, selecting a thinner isolating membrane and an electrolyte with higher ionic conductivity, improving a conductive network and the like; on the other hand, the winding tension can be properly increased, the adhesive is pasted at the winding ending position in the winding process of the battery cell, the hot pressing parameters of the hot pressing of the winding core are adjusted, the pole ear is ultrasonically welded, the soft package battery can also reduce the gap between the positive pole piece and the negative pole piece by using a mode of increasing the clamp force by using a clamp and the like, so that the transmission distance of lithium ions between the pole pieces is shortened, the liquid phase diffusion resistance is reduced, and the rapid migration of the lithium ions is realized.
The full-lug winding core is an important winding core structure, is small in internal resistance and less in heat generation, and does not need a complex cooling system.
However, the reliability of the full-tab winding core rubberizing structure in the prior art is poor.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the utility model is to overcome the problem of poor reliability of the winding core in the prior art, so that the full-tab winding core rubberizing structure and the battery core are provided.
The utility model provides a full-lug winding core rubberizing structure, which comprises:
the winding core is provided with a central shaft and comprises a first pole piece, a second pole piece and a first diaphragm positioned between the first pole piece and the second pole piece, the first diaphragm and the second pole piece are mutually laminated and wound around the central shaft to form the winding core, the second pole piece is positioned on the outer side of the first pole piece, and the second pole piece covers the first pole piece;
the first pole piece comprises a first active area and a first pole ear area connected with the first active area, the second pole piece comprises a second active area and a second pole ear area connected with the second active area, the first pole ear area is positioned on one side of the first active area along the central axis, and the second pole ear area is positioned on the other side of the second active area along the central axis;
and the first adhesive tape is arranged at the junction of the second active area and the first pole lug area in a surrounding way around the central shaft and covers part of the second active area and part of the first pole lug area.
Optionally, the second active region has an epitaxial region on one side of the first polar ear region beyond the first active region in the central axis direction, the epitaxial region covers a portion of the first polar ear region, and the first tape covers at least a portion of the epitaxial region.
Optionally, the number of the winding turns of the first adhesive tape is greater than or equal to 1, and the number of the winding turns of the first adhesive tape is less than or equal to 3.
Optionally, the first tape comprises a first flexible base film and a first adhesive film on one side surface of the first flexible base film; the first adhesive film is positioned between the first flexible base film and the winding core.
Optionally, the first flexible base film comprises a polypropylene base film and the first adhesive film comprises an acrylic adhesive film.
Optionally, the width of the first adhesive tape along the central axis direction of the winding core is 12mm-15 mm;
the width of the first adhesive tape covering the first polar ear region along the central axis direction of the winding core is 2mm-5 mm.
Optionally, the full-tab winding core rubberizing structure further comprises: a second membrane wrapped around the central axis on the outer surface of the jellyroll, the first tape wrapped around the central axis covering a portion of the second membrane, and the first tape in contact with the second membrane.
Optionally, the full-tab winding core rubberizing structure further comprises: a second tape covering a finishing location of the second separator on the outer surface of the jellyroll.
Optionally, the second adhesive tape includes a second flexible base film and a second adhesive film on one side surface of the second flexible base film, the second adhesive film being between the second flexible base film and the second separator.
The utility model also provides a battery cell which comprises the full-lug winding core rubberizing structure.
The technical scheme of the utility model has the following advantages:
according to the full-lug winding core rubberizing structure provided by the technical scheme, the first adhesive tape is arranged at the junction of the second active area and the first lug area, the binding force of the winding core is increased due to the arrangement of the first adhesive tape, the distance between the first active area and the second active area is reduced, the transmission path of conductive ions such as lithium ions is shortened, and the diffusion resistance of the conductive ions is reduced, so that the problem that the conductive ions are insufficiently embedded into a negative electrode after a battery is charged due to the fact that the local distance between the first pole piece and the second pole piece is too large is solved; secondly, the lateral part edge that second utmost point ear district was kept away from to first sticky tape parcel second active area avoids the second active area to keep away from the lateral part edge of second utmost point ear district direct with roll up outer electrolyte direct contact of core to avoid the full utmost point ear to roll up the problem that falls the material that electrolyte leads to washing away of core rubberizing structure to the second active area in extreme use, especially fall the problem of material in the epitaxial zone. In conclusion, the reliability of the full-lug winding core rubberizing structure is improved.
The battery cell provided by the technical scheme of the utility model comprises the full-lug winding core rubberizing structure, and the reliability of the battery cell is improved because the reliability of the full-lug winding core rubberizing structure is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a diagram illustrating a defect in the prior art;
fig. 2 to 5 are schematic diagrams of the full-tab winding core rubberizing structure after each film layer is unfolded;
fig. 6 is a front view of the full tab roll core rubberizing structure of the present invention;
fig. 7 is a right side view corresponding to fig. 6 of the full tab jelly roll rubberizing structure of the utility model;
fig. 8 is an interface diagram of a second pole piece after testing of a prior art cell under a first test condition;
fig. 9 is an interface diagram of a second pole piece after the cell of the present application is tested under a first test condition;
fig. 10 is an interface diagram of a second pole piece after testing of a prior art cell under a second test condition;
fig. 11 is an interface diagram of a second pole piece after the cell of the present application is tested under a second test condition.
Description of reference numerals:
600-a material dropping area; 500-central axis; 100-a first pole piece; 200-a second pole piece; 302-a first membrane; 301-a second membrane; 101-a first active region; 102-a first extreme ear region; 201-a second active region; 202-second polar ear region; 401-first tape; 402-second adhesive tape.
Detailed Description
The inventor researches and discovers that: in the process, the winding of the winding core is generally finished by transversely sticking the tail glue to the full-lug winding core, but the outer ring of the winding core is relatively less in constraint or tension compared with the inner ring, so that a larger gap between pole pieces is easily formed in a specific area. Due to the existence of the gap, on one hand, the transmission path of lithium ions is increased, the diffusion resistance is increased, and the negative electrode in the specific area after the battery is charged often has insufficient lithium intercalation, and shows interface defects such as large-area black spots or purple spots and the like, thereby influencing the normal capacity exertion of the battery. In addition, in the process of injecting liquid or the drop safety experiment of battery, the free electrolyte is easy to permeate from the gap, thereby producing unfavorable impact to the pole piece or the diaphragm, sometimes causing the diaphragm to be impacted and damaged, the negative pole piece edge powder drops and other bad phenomena, as shown in fig. 1, the material dropping area 600 is the area after the negative pole piece edge powder drops. In conclusion, the reliability of the full-tab winding core is poor.
The utility model provides a full-lug winding core rubberizing structure, which improves the reliability of the full-lug winding core rubberizing structure.
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An embodiment of the present invention provides a full tab winding core rubberizing structure, which, with reference to fig. 2 to 7, includes:
a winding core having a central axis 500, the winding core comprising a first pole piece 100, a second pole piece 200 and a first membrane 302 located between the first pole piece 100 and the second pole piece 200, the first membrane 302 and the second pole piece 200 being laminated to each other and wound around the central axis 500 to form the winding core, the second pole piece 200 being located outside the first pole piece 100 and the second pole piece 200 covering the first pole piece 100;
the first pole piece 100 comprises a first active area 101 and a first pole ear area 102 connected to the first active area 101, the second pole piece 200 comprises a second active area 201 and a second pole ear area 202 connected to the second active area 201, the first pole ear area 102 is located on one side of the first active area 101 along the central axis 500, and the second pole ear area 202 is located on the other side of the first active area 101 and the second active area 201 along the central axis 500;
a first adhesive tape 401 (refer to fig. 6 and 7) is disposed around the interface between the second active region 201 and the first polar ear region 102 and covers a portion of the second active region 201 and a portion of the first polar ear region 102.
The second active region 201 has an epitaxial region on one side of the first pole ear region 102 beyond the first active region 101 along the direction of the central axis 500, the epitaxial region covers a portion of the first pole ear region 102, and the first tape 401 covers at least a portion of the epitaxial region.
In one embodiment, the number of turns of the first tape 401 is greater than or equal to 1 and less than or equal to 3. If the number of winding turns is less than 1, the first adhesive tape 401 cannot seal the surrounding part of the first pole ear area 102, and the protection effect on the winding core is reduced; if the number of winding turns is more than or equal to 3, the diameter or the circumference of the winding area of the winding core wound by the first adhesive tape is too large, so that the effective volume of the winding core is reduced, and the winding core is in a shell to cause adverse effect.
The first tape 401 includes a first flexible base film and a first adhesive film on one side surface of the first flexible base film; the first adhesive film is positioned between the first flexible base film and the winding core.
In one embodiment, the first flexible base film comprises a polypropylene base film and the first adhesive film comprises an acrylic adhesive film.
In one embodiment, the first tape 401 has a width along the central axis 500 of the winding core of 12mm to 15mm, for example: 12mm, 13mm, 14mm or 15 mm. If the width of the first adhesive tape 401 along the central axis 500 direction of the winding core is less than 12mm, the covering effect is poor, the increase of the binding force for winding the winding core is reduced, and the effect of solving the problem that the material falls from one end of the second electrode sheet active region far away from the second electrode ear region is reduced; the width of the first tape 401 in the direction of the central axis 500 of the reeling core is more than 15mm, causing waste of raw material.
In one embodiment, the first tape 401 has a width along the central axis 500 of the winding core that covers the first polar ear region 102 of 2mm to 5mm, such as 2mm, 3mm, 4mm, or 5 mm. If the width of the first adhesive tape 401 covering the first tab area 102 is less than 2mm, the first tab area is prone to adhesive lifting, so that the edge of the side portion of the second active area far from the second tab area is directly contacted with the electrolyte outside the roll core, and in extreme use of the roll core, active substances of the electrolyte at one end of the second active area far from the second tab area may be washed away to cause material falling; if the first tape 401 covers more than 5mm of the first pole ear region 102, waste of raw material may be caused.
The roll core further comprises: a second membrane 301 (refer to fig. 5), the second membrane 301 being wrapped around the central axis 500 around the outer surface of the jellyroll, the first tape 401 being wrapped around the central axis around covering a portion of the second membrane 301, and the first tape 401 being in contact with the second membrane 301.
Referring to fig. 6, the full tab winding core rubberizing structure further includes: a second strip of tape 402, the second strip of tape 402 covering a finishing position of the second membrane 301.
The second adhesive tape 402 includes a second flexible base film and a second adhesive film on one side surface of the second flexible base film, the second adhesive film being between the second flexible base film and the second separator.
In one embodiment, the second flexible base film comprises a polypropylene base film and the second adhesive film comprises an acrylic adhesive film.
Another embodiment of the utility model further provides a battery cell, which comprises the full-tab winding core rubberizing structure, and the reliability of the battery cell is improved due to the fact that the reliability of the full-tab winding core rubberizing structure is improved. The battery cell further comprises a shell, and the shell accommodates the full-lug winding core rubberizing structure.
The full-tab winding core rubberizing structure in the battery core comprises a first adhesive tape 401 and a second adhesive tape 402. The full-lug winding core rubberizing structure in the battery core in the prior art is provided with the second adhesive tape but not provided with the first adhesive tape.
Testing the cells of the present application and the cells of the prior art under first test conditions, the first test conditions comprising: and (3) performing constant current discharge on the battery cell to lower limit voltage, then performing constant current-constant voltage charging to upper limit voltage, and then standing the battery cell for 6h to eliminate internal polarization.
And after the test under the first test condition, disassembling the battery cell, and observing the interface condition of the second pole piece of the battery cell. Fig. 8 shows the interface defect of the second electrode plate observed after the cell in the prior art is tested under the first test condition, and it can be clearly seen that there is a large area of black spots, and the black spots have a tendency of diffusing toward the center. Fig. 9 is an interface of the second pole piece observed after the battery cell of the present application is tested under the first test condition, which shows that no black spot appears on the second pole piece of the present application, and the whole battery cell has no abnormality.
Testing the cell of the present application and the cell of the prior art under a second test condition, the second test condition comprising: the method comprises the steps of conducting constant current discharge on a battery cell to lower limit voltage, then conducting constant current-constant voltage charge to upper limit voltage, standing the battery cell for 6 hours to eliminate internal polarization, then conducting a free drop experiment on the battery cell, wherein the drop height is 1m, the central axis of a roll core is perpendicular to the ground, and one end of a first tab area of the battery cell faces the ground.
And after testing under the second test condition, disassembling the battery cell, and observing the interface condition of the second pole piece of the battery cell. Fig. 10 shows an interface defect of the second electrode sheet observed after the cell in the prior art is tested under the second test condition, which can clearly show that there is a black spot in a larger area, and an obvious material dropping phenomenon occurs at one end of the second electrode sheet active region, which is far away from the second electrode ear region. Fig. 11 is an interface of the second pole piece observed after the battery cell of the present application is tested under the second test condition, which shows that the second pole piece of the present application has no black spots and no material falling phenomenon, and is not abnormal as a whole.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.
Claims (10)
1. The utility model provides a full utmost point ear rolls up core rubberizing structure which characterized in that includes:
a jelly roll having a central shaft, the jelly roll including a first pole piece, a second pole piece, and a first separator located between the first pole piece and the second pole piece, the first separator, and the second pole piece being stacked on each other and wound around the central shaft to form the jelly roll, the second pole piece being located outside the first pole piece, and the second pole piece covering the first pole piece;
the first pole piece comprises a first active area and a first pole ear area connected with the first active area, the second pole piece comprises a second active area and a second pole ear area connected with the second active area, the first pole ear area is positioned on one side of the first active area along the central axis, and the second pole ear area is positioned on the other side of the second active area along the central axis;
and the first adhesive tape is arranged at the junction of the second active area and the first pole lug area in a surrounding way around the central shaft and covers part of the second active area and part of the first pole lug area.
2. The full tab jellyroll construction of claim 1, wherein the second active region has an epitaxial region on one side of the first pole ear region beyond the first active region in the direction of the central axis, the epitaxial region covering a portion of the first pole ear region, the first tape covering at least a portion of the epitaxial region.
3. The full-tab winding core rubberizing structure according to claim 1, wherein the number of the surrounding turns of the first adhesive tape is greater than or equal to 1, and the number of the surrounding turns of the first adhesive tape is less than or equal to 3.
4. The full tab jellyroll rubberizing structure of claim 1, wherein the first tape comprises a first flexible base film and a first adhesive film on one side surface of the first flexible base film; the first adhesive film is positioned between the first flexible base film and the winding core.
5. The full tab jellyroll rubberized structure of claim 4, wherein the first flexible base film comprises a polypropylene base film and the first adhesive film comprises an acrylic adhesive film.
6. The full-tab winding core rubberizing structure according to claim 1, wherein a width of the first adhesive tape along a central axis direction of the winding core is 12mm to 15 mm;
the width of the first adhesive tape covering the first polar ear region along the central axis direction of the winding core is 2mm-5 mm.
7. The full-tab jelly roll structure of claim 1, further comprising:
a second membrane wrapped around the central axis on the outer surface of the jellyroll, the first tape wrapped around the central axis covering a portion of the second membrane, and the first tape in contact with the second membrane.
8. The full-tab winding core rubberizing structure according to claim 7, wherein the full-tab winding core rubberizing structure further comprises: a second tape covering a finishing position of the second separator on the outer surface of the jellyroll.
9. The full tab jellyroll rubberizing structure of claim 8, wherein the second tape comprises a second flexible base film and a second adhesive film on one side surface of the second flexible base film, the second adhesive film being positioned between the second flexible base film and the second separator film.
10. A battery cell, comprising: the full tab jellyroll pasting structure of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123159010.4U CN216719989U (en) | 2021-12-15 | 2021-12-15 | Full utmost point ear book core rubberizing structure and electricity core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123159010.4U CN216719989U (en) | 2021-12-15 | 2021-12-15 | Full utmost point ear book core rubberizing structure and electricity core |
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| CN216719989U true CN216719989U (en) | 2022-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115692863A (en) * | 2022-11-04 | 2023-02-03 | 厦门海辰储能科技股份有限公司 | Structure and encapsulation method of battery core, battery monomer, energy storage device and electric equipment |
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2021
- 2021-12-15 CN CN202123159010.4U patent/CN216719989U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115692863A (en) * | 2022-11-04 | 2023-02-03 | 厦门海辰储能科技股份有限公司 | Structure and encapsulation method of battery core, battery monomer, energy storage device and electric equipment |
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518107 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |