CN210074070U - High-safety lithium ion battery cell structure - Google Patents
High-safety lithium ion battery cell structure Download PDFInfo
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- CN210074070U CN210074070U CN201921317303.0U CN201921317303U CN210074070U CN 210074070 U CN210074070 U CN 210074070U CN 201921317303 U CN201921317303 U CN 201921317303U CN 210074070 U CN210074070 U CN 210074070U
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 46
- 239000011248 coating agent Substances 0.000 claims abstract description 181
- 238000000576 coating method Methods 0.000 claims abstract description 181
- 239000011149 active material Substances 0.000 claims abstract description 80
- 239000007774 positive electrode material Substances 0.000 claims abstract description 48
- 239000007773 negative electrode material Substances 0.000 claims abstract description 43
- 238000004804 winding Methods 0.000 claims description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000004880 explosion Methods 0.000 abstract description 8
- 230000005611 electricity Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000004031 devitrification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 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
- 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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- 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
Abstract
The utility model discloses a high-safety lithium ion battery cell structure, which comprises a cell structure body, wherein the cell structure body comprises a positive plate and a negative plate; the positive plate comprises a positive current collector and a positive active material coating coated on the surface of the positive current collector, and the negative plate comprises a negative current collector and a negative active material coating coated on the surface of the negative current collector; the coating amount of the active material of the positive plate and/or the negative plate arranged on the outer layer of the battery cell structure body is lower than that of the active material arranged at the center of the battery cell structure body. The utility model provides a high security lithium ion battery electricity core structure, not only the effectual serious decay of having avoided electric core capacity has improved lithium ion battery's security and reliability moreover to effectual lithium ion battery thermal runaway and the emergence of burning explosion accident have been reduced, personnel's safety has been guaranteed.
Description
Technical Field
The utility model belongs to the technical field of the battery safety, concretely relates to high security lithium ion battery electricity core structure.
Background
Along with the increasing severity of energy crisis and environmental pollution problems, new energy automobiles are more and more favored by various countries due to the great advantages of energy conservation and emission reduction, electric automobiles are gradually accepted by people due to the utmost promotion and great preferential strength of the countries, and electric bicycles are gradually favored by people due to the advantages of lightness, flexibility, smallness and the like. The power battery is the most important power source of new energy vehicles, and the lithium ion battery gradually becomes the mainstream of the power battery due to the characteristics of high specific energy, long service life and the like. The cell structure is an important component of the lithium ion battery and is a main factor directly influencing the safety performance, the energy density and the cycle life of the lithium ion battery.
The existing lithium ion battery cell structure mainly comprises a winding type and a laminated type, and the quality of active materials coated at each position of current collectors of all the cell structure is the same, so that the high energy density and the high safety performance of the lithium ion battery cannot be obtained at the same time.
Disclosure of Invention
In order to solve the not enough of prior art, the utility model provides a high security lithium ion battery electricity core structure, not only effectual serious decay of having avoided electric core capacity has improved lithium ion battery's security and reliability moreover to effectual lithium ion battery thermal runaway and the emergence of burning explosion accident have been reduced, personnel's safety has been guaranteed.
The utility model discloses the technological effect that will reach is realized through following scheme:
the utility model provides a high security lithium ion battery cell structure, including the cell structure body, the cell structure body includes positive plate and negative plate; the positive plate comprises a positive current collector and a positive active material coating coated on the surface of the positive current collector, the negative plate comprises a negative current collector and a negative active material coating coated on the surface of the negative current collector, the positive current collector is of an aluminum foil structure, and the negative current collector is of a copper foil structure; the coating amount of the active material of the positive plate and/or the negative plate arranged on the outer layer of the battery cell structure body is lower than that of the active material arranged at the center of the battery cell structure body.
The battery cell structure composed of the positive plate and the negative plate with uniform coating amount of the active material has unstable environment where the outer battery cell is located, is easy to generate thermal instability reaction, and induces thermal runaway and combustion explosion accidents of the lithium ion battery. The active material with low coating amount on the outer layer of the battery cell structure can reduce the degree of side reaction between the active material and electrolyte, reduce the generation of harmful substances in the lithium ion battery, effectively improve the safety and reliability of the lithium ion battery, reduce the occurrence of thermal runaway and combustion explosion accidents of the lithium ion battery, ensure the safety of personnel, keep the coating amount at the center of the battery cell structure unchanged or increased, and effectively reduce the rate of attenuation of the capacity of the battery cell.
Further, the battery cell structure body is a winding battery cell structure, and comprises a positive plate and a negative plate which are of strip structures, and the winding battery cell structure is a cylindrical winding battery cell structure or a square winding battery cell structure.
Further, the positive active material coating of the winding type battery cell structure sequentially comprises a positive high coating amount area, a positive lug area and a positive low coating amount area from the center of the battery cell structure body to the outer layer;
or the positive active material coating sequentially comprises a positive active material area, a positive lug area and a positive low-coating-quantity area from the center of the cell structure body to the outer layer;
or the positive active material coating sequentially comprises a positive high coating amount area, a positive active material area, a positive lug area and a positive low coating amount area from the center of the cell structure body to the outer layer;
or the positive active material coating sequentially comprises a positive high coating amount area, a positive lug area, a positive active material area and a positive low coating amount area from the center of the cell structure body to the outer layer.
Further, the negative active material coating of the winding type cell structure sequentially comprises a negative high coating amount area, a negative low coating amount area and a negative ear area from the center of the cell structure body to the outer layer;
or the negative active material coating sequentially comprises a negative active material area, a negative low coating amount area and a negative lug area from the center of the cell structure body to the outer layer;
or the negative active material coating sequentially comprises a negative high coating amount area, a negative active material area, a negative low coating amount area and a negative lug area from the center of the battery cell structure body to the outer layer.
The design of N/P ratio is met, the structures of the anode active material coating and the structures of the cathode active material coating are freely combined, high-safety winding type battery cell structures with various different structures can be formed, and different production and application requirements are met.
In order to further optimize the overall structure of the battery cell, preferably, the length of the positive electrode high coating quantity area or the positive electrode high coating quantity area and the positive electrode active material area is greater than that of the positive electrode low coating quantity area;
the length of the negative electrode high coating amount region or the negative electrode high coating amount region and the negative electrode active material region is greater than that of the negative electrode low coating amount region.
Further, the battery cell structure body is of a laminated battery cell structure and comprises a positive plate and a negative plate which are of square structures.
Furthermore, the positive plate of the laminated cell structure comprises a high-coating-quantity positive plate arranged at the center of the cell structure body and low-coating-quantity positive plates respectively arranged at two sides of the high-coating-quantity positive plate and on the outer layer of the cell structure body;
or the positive plate comprises an active material positive plate arranged at the center of the cell structure body and low-coating-quantity positive plates respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body;
or the positive plate comprises a high coating quantity positive plate arranged at the center of the cell structure body and active material positive plates respectively arranged at two sides of the high coating quantity positive plate and on the outer layer of the cell structure body;
or the positive plate comprises a high coating quantity positive plate arranged at the center of the cell structure body, active material positive plates respectively arranged on two sides of the high coating quantity positive plate, and low coating quantity positive plates respectively arranged on two sides of the active material positive plate and the outer layer of the cell structure body.
Further, the negative pole pieces of the laminated cell structure comprise high-coating-capacity negative pole pieces arranged at the center of the cell structure body and low-coating-capacity negative pole pieces respectively arranged on two sides of the high-coating-capacity negative pole pieces and on the outer layer of the cell structure body;
or the negative plate comprises an active material negative plate arranged at the center of the cell structure body and low-coating-quantity negative plates respectively arranged at two sides of the active material negative plate and on the outer layer of the cell structure body;
or the negative plate comprises a high-coating-capacity negative plate arranged at the center of the cell structure body and active material negative plates respectively arranged at two sides of the high-coating-capacity negative plate and on the outer layer of the cell structure body;
or the negative pole pieces comprise high-coating-capacity negative pole pieces arranged at the center of the battery cell structure body, active material negative pole pieces arranged on two sides of the high-coating-capacity negative pole pieces, and low-coating-capacity negative pole pieces arranged on two sides of the active material negative pole pieces and on the outer layer of the battery cell structure body.
The design of N/P ratio is met, the structures of the positive plate and the structures of the negative plate are freely combined, high-safety laminated cell structures with various different structures can be formed, and different production and application requirements are met.
Further, the N/P ratio of the coating amounts of the positive and negative active materials of the cell structure body ranges from 1.05 to 1.5; the N/P ratio is one of the basic elements for preparing the battery cell, and the calculation method comprises the following steps: N/P = negative electrode capacity per unit area/positive electrode capacity per unit area, and can be adjusted according to design according to selection of different systems and different materials, and preferably, the N/P ratio ranges from 1.05 to 1.5, which can effectively inhibit adverse phenomena such as battery crystallization.
Furthermore, the battery cell structure body also comprises a diaphragm which is arranged between the positive plate and the negative plate and separates the positive plate from the negative plate, so that the positive plate and the negative plate are prevented from being contacted and conducting to form a short circuit; the positive tab is arranged on the positive plate and used for conducting the positive plate, and the negative tab is arranged on the negative plate and used for conducting the negative plate; the diaphragm is combined with the positive plate provided with the positive tab and the negative plate provided with the negative tab to form a complete high-safety lithium ion battery cell structure.
The utility model discloses a high security lithium ion battery electricity core structure has following advantage:
the utility model provides a high security lithium ion battery electricity core structure, not only the effectual serious decay of having avoided electric core capacity has improved lithium ion battery's security and reliability moreover to effectual lithium ion battery thermal runaway and the emergence of burning explosion accident have been reduced, personnel's safety has been guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a cell structure of a high-safety lithium ion battery of the present invention;
fig. 2 is a schematic diagram of the area distribution of the positive active material coating of the winding type cell structure according to the present invention;
fig. 3 is a schematic diagram of the area distribution of the negative active material coating of the winding type cell structure according to the present invention;
fig. 4 is a schematic diagram of the area distribution of the positive plate with the laminated cell structure according to the present invention;
fig. 5 is a schematic diagram of the area distribution of the laminated cell structure negative plate of the present invention.
The reference numerals are explained below:
100. a positive plate; 110. a positive high coating amount region; 120. a positive tab region; 130. a positive low coating amount region; 140. a positive electrode active material region; 101. a high coating amount positive plate; 102. a low coating amount positive plate; 103. an active material positive plate; 200. a negative plate; 210. a negative high coating amount region; 220. a negative electrode low coating amount region; 230. a negative electrode tab region; 240. a negative active material region; 201. high coating amount negative pole pieces; 202. a low coating amount negative plate; 203. an active material negative electrode sheet; 300. a diaphragm; 400. a positive tab; 500. and a negative tab.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
The high-safety lithium ion battery cell structure in the embodiment of the present invention, as shown in fig. 1, includes a cell structure body, and the cell structure body includes a positive plate 100 and a negative plate 200; the positive plate comprises a positive current collector and a positive active material coating coated on the surface of the positive current collector, and the positive current collector is of an aluminum foil structure; the negative plate comprises a negative current collector and a negative active material coating coated on the surface of the negative current collector, and the negative current collector is of a copper foil structure. The battery cell structure body also comprises a diaphragm which is arranged between the positive plate and the negative plate and separates the positive plate from the negative plate so as to avoid the positive plate and the negative plate from being contacted and conducting to form a short circuit; the positive tab is arranged on the positive plate, and the negative tab is arranged on the negative plate; the diaphragm is combined with the positive plate provided with the positive tab and the negative plate provided with the negative tab to form a complete high-safety lithium ion battery cell structure. And the coating amount of the active materials of the positive plate and the negative plate arranged on the outer layer of the battery cell structure body is lower than that of the active materials arranged at the center of the battery cell structure body.
The battery cell structure formed by the positive plate and the negative plate which are uniformly coated with the active material has the advantages that the environment of the outer battery cell is unstable, the thermal instability reaction is easy to occur, and the thermal runaway and the combustion explosion accidents of the lithium ion battery are induced. The active material with low coating amount on the outer layer of the cell structure can reduce the degree of side reaction between the active material and electrolyte, reduce the generation of harmful substances in the lithium ion battery, effectively improve the safety and reliability of the lithium ion battery, reduce the occurrence of thermal runaway and combustion explosion accidents of the lithium ion battery, and ensure the safety of personnel; and the coating amount at the center of the cell structure is kept unchanged or increased, so that the rate of cell capacity attenuation can be effectively reduced. In order to effectively suppress the undesirable phenomena such as battery devitrification, the N/P ratio of the coating amounts of the positive and negative electrode active materials of the cell structural body is preferably in the range of 1.05 to 1.5.
The change of the coating amount of the active material can be realized by changing the compaction density and the surface density, and the proportion of the conductive adhesive, the binder, the anode material and the cathode material, and the like, and the process and the material composition are not in the protection range of the utility model, so the details are not repeated in the embodiment.
Example 1:
the battery cell structure body is a winding battery cell structure, and comprises a positive plate and a negative plate which are of strip structures, and the winding battery cell structure is a cylindrical winding battery cell structure or a square winding battery cell structure. Satisfy the design of N/P ratio, the positive plate that the coating has the anodal active material coating and the negative pole piece free combination that the coating has the negative pole active material coating form the high security coiling formula electricity core structure of multiple not isostructure, satisfy different production and application demands, and concrete structural design is as follows:
scheme 1: as shown in fig. 2 (a), the positive active material coating of the winding-type cell structure sequentially includes a positive high-coating-amount region 110, a positive tab region 120, and a positive low-coating-amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (a), the negative active material coating of the wound cell structure sequentially includes a negative high coating amount region 210, a negative low coating amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 2: as shown in fig. 2 (a), the positive active material coating of the winding-type cell structure sequentially includes a positive high-coating-amount region 110, a positive tab region 120, and a positive low-coating-amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (b), the negative active material coating of the wound cell structure sequentially includes a negative active material region 240, a negative low-coating-amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 3: as shown in fig. 2 (a), the positive active material coating of the winding-type cell structure sequentially includes a positive high-coating-amount region 110, a positive tab region 120, and a positive low-coating-amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (c), the negative active material coating of the wound cell structure sequentially includes a negative high coating amount region 210, a negative active material region 240, a negative low coating amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 4: as shown in fig. 2 (b), the positive active material coating of the winding-type cell structure sequentially includes a positive active material region 140, a positive tab region 120, and a positive low-coating-amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (a), the negative active material coating of the wound cell structure sequentially includes a negative high coating amount region 210, a negative low coating amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 5: as shown in fig. 2 (b), the positive active material coating of the winding-type cell structure sequentially includes a positive active material region 140, a positive tab region 120, and a positive low-coating-amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (b), the negative active material coating of the wound cell structure sequentially includes a negative active material region 240, a negative low-coating-amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 6: as shown in fig. 2 (b), the positive active material coating of the winding-type cell structure sequentially includes a positive active material region 140, a positive tab region 120, and a positive low-coating-amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (c), the negative active material coating of the wound cell structure sequentially includes a negative high coating amount region 210, a negative active material region 240, a negative low coating amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 7: as shown in fig. 2 (c), the positive active material coating of the winding-type cell structure sequentially includes a positive high coating amount region 110, a positive active material region 140, a positive tab region 120, and a positive low coating amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (a), the negative active material coating of the wound cell structure sequentially includes a negative high coating amount region 210, a negative low coating amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 8: as shown in fig. 2 (c), the positive active material coating of the winding-type cell structure sequentially includes a positive high coating amount region 110, a positive active material region 140, a positive tab region 120, and a positive low coating amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (b), the negative active material coating of the wound cell structure sequentially includes a negative active material region 240, a negative low-coating-amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 9: as shown in fig. 2 (c), the positive active material coating of the winding-type cell structure sequentially includes a positive high coating amount region 110, a positive active material region 140, a positive tab region 120, and a positive low coating amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (c), the negative active material coating of the wound cell structure sequentially includes a negative high coating amount region 210, a negative active material region 240, a negative low coating amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 10: as shown in fig. 2 (d), the positive active material coating of the winding-type cell structure sequentially includes a positive high coating amount region 110, a positive tab region 120, a positive active material region 140, and a positive low coating amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (a), the negative active material coating of the wound cell structure sequentially includes a negative high coating amount region 210, a negative low coating amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 11: as shown in fig. 2 (d), the positive active material coating of the winding-type cell structure sequentially includes a positive high coating amount region 110, a positive tab region 120, a positive active material region 140, and a positive low coating amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (b), the negative active material coating of the wound cell structure sequentially includes a negative active material region 240, a negative low-coating-amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
Scheme 12: as shown in fig. 2 (d), the positive active material coating of the winding-type cell structure sequentially includes a positive high coating amount region 110, a positive tab region 120, a positive active material region 140, and a positive low coating amount region 130 from the center of the cell structure body to the outside; as shown in fig. 3 (c), the negative active material coating of the wound cell structure sequentially includes a negative high coating amount region 210, a negative active material region 240, a negative low coating amount region 220, and a negative tab region 230 from the center of the cell structure body to the outside.
In order to further optimize the overall structure of the battery cell, preferably, the length of the positive electrode high coating quantity area or the positive electrode high coating quantity area and the positive electrode active material area is greater than that of the positive electrode low coating quantity area; the length of the negative electrode high coating amount region or the negative electrode high coating amount region and the negative electrode active material region is greater than that of the negative electrode low coating amount region.
Example 2:
the battery cell structure body is of a laminated battery cell structure and comprises a positive plate and a negative plate which are of square structures; the positive plate coated with the positive active material coating and the negative plate coated with the negative active material coating are freely combined to form a high-safety laminated cell structure with various different structures, so that different production and application requirements are met, and the specific structural design is as follows:
scheme 13: the distribution of the positive plates of the laminated cell structure is shown in (a) in the attached figure 4, and the laminated cell structure comprises a high-coating-quantity positive plate 101 arranged at the center of a cell structure body and low-coating-quantity positive plates 102 respectively arranged at two sides of the high-coating-quantity positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (a) in fig. 5, and includes a high coating amount negative pole piece 201 arranged at the center of the cell structure body, and low coating amount negative pole pieces 202 respectively arranged on two sides of the high coating amount negative pole piece and on the outer layer of the cell structure body.
Scheme 14: the distribution of the positive plates of the laminated cell structure is shown in (a) in the attached figure 4, and the laminated cell structure comprises a high-coating-quantity positive plate 101 arranged at the center of a cell structure body and low-coating-quantity positive plates 102 respectively arranged at two sides of the high-coating-quantity positive plate and on the outer layer of the cell structure body; the negative pole pieces of the laminated cell structure are distributed as shown in (b) of fig. 5, and include an active material negative pole piece 203 disposed at the center of the cell structure body, and low coating quantity negative pole pieces 202 respectively disposed on both sides of the active material negative pole piece and on the outer layer of the cell structure body.
Scheme 15: the distribution of the positive plates of the laminated cell structure is shown in (a) in the attached figure 4, and the laminated cell structure comprises a high-coating-quantity positive plate 101 arranged at the center of a cell structure body and low-coating-quantity positive plates 102 respectively arranged at two sides of the high-coating-quantity positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (c) in fig. 5, and the negative pole pieces include a high-coating-capacity negative pole piece 201 arranged at the center of the cell structure body, and active material negative pole pieces 203 respectively arranged on two sides of the high-coating-capacity negative pole piece and on the outer layer of the cell structure body.
Scheme 16: the distribution of the positive plates of the laminated cell structure is shown in (a) in the attached figure 4, and the laminated cell structure comprises a high-coating-quantity positive plate 101 arranged at the center of a cell structure body and low-coating-quantity positive plates 102 respectively arranged at two sides of the high-coating-quantity positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (d) in the attached figure 5, and comprises a high coating amount negative pole piece 201 arranged at the center of the cell structure body, active material negative pole pieces 203 arranged on two sides of the high coating amount negative pole piece, and low coating amount negative pole pieces 202 arranged on two sides of the active material negative pole piece and on the outer layer of the cell structure body. Scheme 17: the distribution of the positive plates of the laminated cell structure is shown in (b) in the attached figure 4, and the laminated cell structure comprises an active material positive plate 103 arranged at the center of a cell structure body and low-coating-quantity positive plates 102 respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (a) in fig. 5, and includes a high coating amount negative pole piece 201 arranged at the center of the cell structure body, and low coating amount negative pole pieces 202 respectively arranged on two sides of the high coating amount negative pole piece and on the outer layer of the cell structure body.
Scheme 18: the distribution of the positive plates of the laminated cell structure is shown in (b) in the attached figure 4, and the laminated cell structure comprises an active material positive plate 103 arranged at the center of a cell structure body and low-coating-quantity positive plates 102 respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body; the negative pole pieces of the laminated cell structure are distributed as shown in (b) of fig. 5, and include an active material negative pole piece 203 disposed at the center of the cell structure body, and low coating quantity negative pole pieces 202 respectively disposed on both sides of the active material negative pole piece and on the outer layer of the cell structure body.
Scheme 19: the distribution of the positive plates of the laminated cell structure is shown in (b) in the attached figure 4, and the laminated cell structure comprises an active material positive plate 103 arranged at the center of a cell structure body and low-coating-quantity positive plates 102 respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (c) in fig. 5, and the negative pole pieces include a high-coating-capacity negative pole piece 201 arranged at the center of the cell structure body, and active material negative pole pieces 203 respectively arranged on two sides of the high-coating-capacity negative pole piece and on the outer layer of the cell structure body.
Scheme 20: the distribution of the positive plates of the laminated cell structure is shown in (b) in the attached figure 4, and the laminated cell structure comprises an active material positive plate 103 arranged at the center of a cell structure body and low-coating-quantity positive plates 102 respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (d) in the attached figure 5, and comprises a high coating amount negative pole piece 201 arranged at the center of the cell structure body, active material negative pole pieces 203 arranged on two sides of the high coating amount negative pole piece, and low coating amount negative pole pieces 202 arranged on two sides of the active material negative pole piece and on the outer layer of the cell structure body.
Scheme 21: the distribution of the positive plates of the laminated cell structure is shown in (c) in the attached figure 4, and the laminated cell structure comprises a high-coating-capacity positive plate 101 arranged at the center of a cell structure body and active material positive plates 103 respectively arranged at two sides of the high-coating-capacity positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (a) in fig. 5, and includes a high coating amount negative pole piece 201 arranged at the center of the cell structure body, and low coating amount negative pole pieces 202 respectively arranged on two sides of the high coating amount negative pole piece and on the outer layer of the cell structure body.
Scheme 22: the distribution of the positive plates of the laminated cell structure is shown in (c) in the attached figure 4, and the laminated cell structure comprises a high-coating-capacity positive plate 101 arranged at the center of a cell structure body and active material positive plates 103 respectively arranged at two sides of the high-coating-capacity positive plate and on the outer layer of the cell structure body; the negative pole pieces of the laminated cell structure are distributed as shown in (b) of fig. 5, and include an active material negative pole piece 203 disposed at the center of the cell structure body, and low coating quantity negative pole pieces 202 respectively disposed on both sides of the active material negative pole piece and on the outer layer of the cell structure body.
Scheme 23: the distribution of the positive plates of the laminated cell structure is shown in (c) in the attached figure 4, and the laminated cell structure comprises a high-coating-capacity positive plate 101 arranged at the center of a cell structure body and active material positive plates 103 respectively arranged at two sides of the high-coating-capacity positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (c) in fig. 5, and the negative pole pieces include a high-coating-capacity negative pole piece 201 arranged at the center of the cell structure body, and active material negative pole pieces 203 respectively arranged on two sides of the high-coating-capacity negative pole piece and on the outer layer of the cell structure body.
Scheme 24: the distribution of the positive plates of the laminated cell structure is shown in (c) in the attached figure 4, and the laminated cell structure comprises a high-coating-capacity positive plate 101 arranged at the center of a cell structure body and active material positive plates 103 respectively arranged at two sides of the high-coating-capacity positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (d) in the attached figure 5, and comprises a high coating amount negative pole piece 201 arranged at the center of the cell structure body, active material negative pole pieces 203 arranged on two sides of the high coating amount negative pole piece, and low coating amount negative pole pieces 202 arranged on two sides of the active material negative pole piece and on the outer layer of the cell structure body.
Scheme 25: the distribution of the positive plates of the laminated cell structure is shown in (d) in the attached figure 4, and the laminated cell structure comprises a high-coating-quantity positive plate 101 arranged at the center of a cell structure body, active material positive plates 103 respectively arranged at two sides of the high-coating-quantity positive plate, and low-coating-quantity positive plates 102 respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (a) in fig. 5, and includes a high coating amount negative pole piece 201 arranged at the center of the cell structure body, and low coating amount negative pole pieces 202 respectively arranged on two sides of the high coating amount negative pole piece and on the outer layer of the cell structure body.
Scheme 26: the distribution of the positive plates of the laminated cell structure is shown in (d) in the attached figure 4, and the laminated cell structure comprises a high-coating-quantity positive plate 101 arranged at the center of a cell structure body, active material positive plates 103 respectively arranged at two sides of the high-coating-quantity positive plate, and low-coating-quantity positive plates 102 respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body; the negative pole pieces of the laminated cell structure are distributed as shown in (b) of fig. 5, and include an active material negative pole piece 203 disposed at the center of the cell structure body, and low coating quantity negative pole pieces 202 respectively disposed on both sides of the active material negative pole piece and on the outer layer of the cell structure body.
Scheme 27: the distribution of the positive plates of the laminated cell structure is shown in (d) in the attached figure 4, and the laminated cell structure comprises a high-coating-quantity positive plate 101 arranged at the center of a cell structure body, active material positive plates 103 respectively arranged at two sides of the high-coating-quantity positive plate, and low-coating-quantity positive plates 102 respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (c) in fig. 5, and the negative pole pieces include a high-coating-capacity negative pole piece 201 arranged at the center of the cell structure body, and active material negative pole pieces 203 respectively arranged on two sides of the high-coating-capacity negative pole piece and on the outer layer of the cell structure body.
Scheme 28: the distribution of the positive plates of the laminated cell structure is shown in (d) in the attached figure 4, and the laminated cell structure comprises a high-coating-quantity positive plate 101 arranged at the center of a cell structure body, active material positive plates 103 respectively arranged at two sides of the high-coating-quantity positive plate, and low-coating-quantity positive plates 102 respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body; the distribution of the negative pole pieces of the laminated cell structure is shown in (d) in the attached figure 5, and comprises a high coating amount negative pole piece 201 arranged at the center of the cell structure body, active material negative pole pieces 203 arranged on two sides of the high coating amount negative pole piece, and low coating amount negative pole pieces 202 arranged on two sides of the active material negative pole piece and on the outer layer of the cell structure body.
According to the scheme of the above embodiment, the utility model provides a high security lithium ion battery electricity core structure, not only effectual serious decay of having avoided electric core capacity has improved lithium ion battery's security and reliability moreover to effectual lithium ion battery thermal runaway and the emergence of burning explosion accident have been reduced, personnel's safety has been guaranteed.
It should be finally noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the present invention can still be modified or replaced with equivalents, and these modifications or equivalent replacements cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A high-safety lithium ion battery cell structure comprises a cell structure body, wherein the cell structure body comprises a positive plate and a negative plate; the method is characterized in that:
the positive plate comprises a positive current collector and a positive active material coating coated on the surface of the positive current collector, the negative plate comprises a negative current collector and a negative active material coating coated on the surface of the negative current collector, the positive current collector is of an aluminum foil structure, and the negative current collector is of a copper foil structure;
the coating amount of the active material of the positive plate and/or the negative plate arranged on the outer layer of the battery cell structure body is lower than that of the active material arranged at the center of the battery cell structure body.
2. The high-safety lithium-ion battery cell structure of claim 1, wherein: the battery cell structure body is a winding battery cell structure, and comprises a positive plate and a negative plate which are of strip structures, and the winding battery cell structure is a cylindrical winding battery cell structure or a square winding battery cell structure.
3. The high-safety lithium-ion battery cell structure of claim 2, wherein: the positive active material coating of the winding type battery cell structure sequentially comprises a positive high-coating-quantity area, a positive lug area and a positive low-coating-quantity area from the center of the battery cell structure body to the outer layer;
or the positive active material coating sequentially comprises a positive active material area, a positive lug area and a positive low-coating-quantity area from the center of the cell structure body to the outer layer;
or the positive active material coating sequentially comprises a positive high coating amount area, a positive active material area, a positive lug area and a positive low coating amount area from the center of the cell structure body to the outer layer;
or the positive active material coating sequentially comprises a positive high coating amount area, a positive lug area, a positive active material area and a positive low coating amount area from the center of the cell structure body to the outer layer.
4. The high-safety lithium-ion battery cell structure of claim 2, wherein: the negative active material coating of the winding type battery cell structure sequentially comprises a negative high coating amount area, a negative low coating amount area and a negative lug area from the center of the battery cell structure body to the outer layer;
or the negative active material coating sequentially comprises a negative active material area, a negative low coating amount area and a negative lug area from the center of the cell structure body to the outer layer;
or the negative active material coating sequentially comprises a negative high coating amount area, a negative active material area, a negative low coating amount area and a negative lug area from the center of the battery cell structure body to the outer layer.
5. The high-safety lithium-ion battery cell structure of claim 3, wherein: the length of the positive electrode high coating amount region or the positive electrode high coating amount region and the positive electrode active material region is greater than that of the positive electrode low coating amount region.
6. The high-safety lithium-ion battery cell structure of claim 4, wherein: the length of the negative electrode high coating amount region or the negative electrode high coating amount region and the negative electrode active material region is greater than that of the negative electrode low coating amount region.
7. The high-safety lithium-ion battery cell structure of claim 1, wherein: the battery cell structure body is of a laminated battery cell structure and comprises a positive plate and a negative plate which are of square structures.
8. The high-safety lithium-ion battery cell structure of claim 7, wherein: the positive plate of the laminated cell structure comprises a high-coating-quantity positive plate arranged at the center of the cell structure body and low-coating-quantity positive plates respectively arranged on two sides of the high-coating-quantity positive plate and on the outer layer of the cell structure body;
or the positive plate comprises an active material positive plate arranged at the center of the cell structure body and low-coating-quantity positive plates respectively arranged at two sides of the active material positive plate and on the outer layer of the cell structure body;
or the positive plate comprises a high coating quantity positive plate arranged at the center of the cell structure body and active material positive plates respectively arranged at two sides of the high coating quantity positive plate and on the outer layer of the cell structure body;
or the positive plate comprises a high coating quantity positive plate arranged at the center of the cell structure body, active material positive plates respectively arranged on two sides of the high coating quantity positive plate, and low coating quantity positive plates respectively arranged on two sides of the active material positive plate and the outer layer of the cell structure body.
9. The high-safety lithium-ion battery cell structure of claim 7, wherein: the negative plate of the laminated cell structure comprises a high-coating-capacity negative plate arranged at the center of the cell structure body and low-coating-capacity negative plates respectively arranged on two sides of the high-coating-capacity negative plate and on the outer layer of the cell structure body;
or the negative plate comprises an active material negative plate arranged at the center of the cell structure body and low-coating-quantity negative plates respectively arranged at two sides of the active material negative plate and on the outer layer of the cell structure body;
or the negative plate comprises a high-coating-capacity negative plate arranged at the center of the cell structure body and active material negative plates respectively arranged at two sides of the high-coating-capacity negative plate and on the outer layer of the cell structure body;
or the negative pole pieces comprise high-coating-capacity negative pole pieces arranged at the center of the battery cell structure body, active material negative pole pieces arranged on two sides of the high-coating-capacity negative pole pieces, and low-coating-capacity negative pole pieces arranged on two sides of the active material negative pole pieces and on the outer layer of the battery cell structure body.
10. The high-safety lithium-ion battery cell structure of claim 1, wherein: the N/P ratio of the coating amount of the positive and negative active materials of the battery cell structure body ranges from 1.05 to 1.5.
11. The high-safety lithium-ion battery cell structure of claim 1, wherein: the battery cell structure body further comprises a diaphragm arranged between the positive plate and the negative plate and used for separating the positive plate from the negative plate, a positive tab arranged on the positive plate and a negative tab arranged on the negative plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921317303.0U CN210074070U (en) | 2019-08-14 | 2019-08-14 | High-safety lithium ion battery cell structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921317303.0U CN210074070U (en) | 2019-08-14 | 2019-08-14 | High-safety lithium ion battery cell structure |
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| CN210074070U true CN210074070U (en) | 2020-02-14 |
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| CN201921317303.0U Active CN210074070U (en) | 2019-08-14 | 2019-08-14 | High-safety lithium ion battery cell structure |
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