CN217719719U - Lithium iron phosphate ion power battery structure - Google Patents
Lithium iron phosphate ion power battery structure Download PDFInfo
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- CN217719719U CN217719719U CN202221242929.1U CN202221242929U CN217719719U CN 217719719 U CN217719719 U CN 217719719U CN 202221242929 U CN202221242929 U CN 202221242929U CN 217719719 U CN217719719 U CN 217719719U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application relates to a lithium iron phosphate ion power battery structure which is used for a cylindrical battery and comprises a positive electrode structure, a roll core, a negative electrode structure and a shell; the positive electrode structure is arranged on the end face of one end of the winding core, the negative electrode structure is arranged on the end face of the other end of the winding core, the winding core is sleeved in the shell, and the negative electrode structure is in butt joint with the inner surface of the bottom of the shell. This application is rubbed the tie through the both ends that will roll up the core and is obtained positive negative pole utmost point ear, can effectively promote the energy density of battery, reduce electric core internal resistance, and the cost is lower. The positive electrode and the negative electrode of the battery adopt a full-lug structure, so that an electron conduction path can be effectively shortened, the internal resistance of the battery is reduced, and the heat dissipation effect in a large-current charging and discharging process is good; meanwhile, the processes of welding the positive electrode lug and the negative electrode lug and encapsulating the lug in the traditional process are eliminated, and the production efficiency is effectively improved. The sealing structure is simple in structure, good in sealing performance, low in cost, good in reliability, simple in production process and high in production efficiency.
Description
Technical Field
The utility model relates to a power battery technical field especially relates to a lithium iron phosphate ion power battery structure.
Background
The power battery can be a cylindrical battery, a square battery or a soft package battery, and the cylindrical battery has the advantages of high production efficiency, high equipment automation degree, good product performance consistency and the like, and is more and more favored by people. However, the power battery can generate a large amount of heat during high-rate charge and discharge, and when the heat dissipation rate cannot meet the requirement, the temperature inside the battery can be continuously increased, so that the cycle life of the battery is shortened, and thermal runaway of the battery is caused in severe cases, thereby causing safety accidents.
At present, the positive electrode/negative electrode of a cylindrical power battery cell on the market mostly adopts a single-pole lug or multi-pole lug structure, so that the heat dissipation requirement of the battery under the condition of high-current charging and discharging is difficult to meet, and the problems of poor cycle life of the battery, long electronic conduction path, large internal resistance of the battery and the like caused by uneven internal tension of the battery in the cycle process and non-tight contact of positive and negative pole pieces near the position of the pole lug due to poor overcurrent capacity of the pole lug and heating of the battery cell during high-current discharging exist. Moreover, the traditional mounting process of the positive and negative electrode lugs comprises the working procedures of welding, lug encapsulation and the like, the operation is complex, and the production efficiency is low.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides a lithium iron phosphate ion power battery structure aims at solving utmost point ear overcurrent capacity poor, when the heavy current discharges electric core generate heat and lead to the battery uneven at the inside power of rising in the cyclic process, near utmost point ear position positive and negative pole piece contact inseparable and lead to battery cycle life poor, electron conduction path length, the big scheduling problem of battery internal resistance.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a lithium iron phosphate ion power battery structure is used for a cylindrical battery and comprises a positive electrode structure, a roll core, a negative electrode structure and a shell; the positive electrode structure is arranged on the end face of one end of the winding core, the negative electrode structure is arranged on the end face of the other end of the winding core, the winding core is sleeved in the shell, and the negative electrode structure is abutted against the inner surface of the bottom of the shell;
the positive electrode structure comprises a cap, an explosion-proof sheet, a positive electrode connecting sheet, a sealing ring, an adhesive tape, a positive electrode lug and an insulating gasket; the positive pole lug is the end surface of the winding core; the insulating gasket is arranged on the edge of the side face, away from the winding core, of the positive electrode lug; the adhesive tape is sleeved at one end of the winding core and is respectively abutted with the positive electrode lug and the insulating gasket; the positive connecting sheet is welded on the side face, far away from the winding core, of the positive electrode lug; the explosion-proof sheet is welded on the side face, far away from the positive electrode lug, of the positive electrode connecting sheet; the cover cap is arranged on the side face, far away from the positive connecting piece, of the explosion-proof piece; the sealing ring is sleeved on the edge of the cover cap and is abutted against the shell.
As a preferred embodiment, a circular protrusion is arranged on the side surface of the positive electrode connecting piece close to the positive electrode tab, a plurality of first strip-shaped protrusions are uniformly arranged on the side surface of the circular protrusion close to the positive electrode tab, and the positive electrode connecting piece is welded on the positive electrode tab through the first strip-shaped protrusions. By the arrangement, the positive connecting sheet can be better contacted with the positive electrode lug, and the fire explosion phenomenon during welding is effectively avoided; meanwhile, the rigidity of the positive electrode connecting sheet can be well increased, and a good pre-pressing effect is achieved on the positive electrode tab.
In a preferred embodiment, a sector is arranged between adjacent first strip-shaped protrusions, and a plurality of through holes are arranged on the sector. In the present application, the through-holes are mainly used for draining and venting.
In a preferred embodiment, a first circular hole is formed at the geometric center of the positive connecting sheet, and each first bar-shaped protrusion extends from the first circular hole to the edge of the positive connecting sheet.
As a preferred embodiment, the positive electrode connecting piece, the circular protrusion, the first bar-shaped protrusion, the fan-shaped surface, the through hole, and the first round hole are integrally formed.
In a preferred embodiment, an inner surface of the tape is in contact with an outer periphery of the positive electrode tab and an outer periphery of the insulating gasket, respectively. Like this, through the fixed insulating gasket of sticky tape to effectively prevent the roll slot in-process insulating gasket aversion and cause the book core short circuit.
In a preferred embodiment, the edge of the cap is uniformly provided with a plurality of vent holes. In this application, the block is as the output of positive pole structure, can play the effect of sealed sealing and top exhaust. The sealing ring can effectively ensure the insulation of the anode structure and the cathode structure while sealing the opening.
In a preferred embodiment, the internal pressure of the explosion-proof sheet is more than or equal to 18Kg. The explosion-proof valve is opened to release pressure, and meanwhile, the explosion-proof sheet is connected with the positive connecting sheet in a welding mode to play a role in sealing and overflowing.
As a preferred embodiment, the negative electrode structure comprises a negative electrode tab and a negative electrode connecting sheet, wherein the negative electrode tab is the end face of the winding core; the negative electrode connecting sheet is welded on the side face of the negative electrode lug, which is far away from the winding core; the negative connecting sheet is abutted against the inner surface of the bottom of the shell.
As a preferred embodiment, a plurality of second strip-shaped protrusions are uniformly arranged on the side surface, close to the negative electrode tab, of the negative electrode connecting sheet, and a fan-shaped groove is arranged between every two adjacent second strip-shaped protrusions; the negative electrode connecting piece is welded on the negative electrode lug through the second strip-shaped protrusions, and the negative electrode connecting piece is abutted to the inner surface of the bottom of the shell through the fan-shaped groove.
In a preferred embodiment, a second circular hole is formed at the geometric center of the negative electrode connecting piece, and each second strip-shaped protrusion extends from the second circular hole to the edge of the negative electrode connecting piece.
The second strip-shaped bulge and the fan-shaped groove are arranged on the side surface, close to the winding core, of the negative electrode connecting piece, so that the rigidity of the negative electrode connecting piece can be well increased, a better prepressing effect is achieved on a negative electrode lug, and the contact resistance is effectively reduced; meanwhile, the internal space of the battery can be fully utilized, and the energy density and the volume density of the battery can be effectively increased.
In a preferred embodiment, the winding core is a winding core obtained by winding positive and negative electrode plates by adopting a winding structure; the positive pole lug is obtained by flattening the positive pole end of the winding core by adopting a flattening process; the negative pole tab is obtained by flattening the negative pole end of the winding core by adopting a flattening process; the positive connecting piece and the negative connecting piece are both connecting pieces obtained by adopting a stamping process.
In this application, anodal utmost point ear and anodal connection piece, anodal connection piece and explosion-proof piece, negative pole utmost point ear and negative pole connection piece, negative pole connection piece all have great welding cross-section bottom the casing, and resistance is less, can be through big electric current, consequently adopts the battery of this application structure to have that physical resistance is little, can be through the ability of big multiplying power electric current, simultaneously can be fine assurance battery structure's leakproofness and reliability.
In a preferred embodiment, the cap is made of a nickel-plated steel strip; the positive connecting piece is made of aluminum; the explosion-proof sheet is made of aluminum; the shell is a nickel-plated steel shell; the negative electrode connecting piece is a connecting piece made of copper or nickel.
The utility model discloses the beneficial effect who reaches: the positive electrode and the negative electrode of the battery adopt a full-lug structure, so that an electron conduction path can be effectively shortened, the internal resistance of the battery is reduced, the problem that a battery core is heated due to heavy-current discharge is solved, and the heat dissipation effect in the heavy-current charge-discharge process is good; meanwhile, the procedures of welding the positive electrode lug and the negative electrode lug and encapsulating the lugs in the traditional process are removed, and the production efficiency is improved. The positive and negative pole lugs are obtained by rubbing the two ends of the roll core flatly, so that a single-pole lug or multi-pole lug structure of a traditional cylindrical battery in the current market can be replaced, the energy density of the battery is effectively improved, the internal resistance of the battery cell is reduced, and the cost is low (the processes of positive and negative pole lugs, high-temperature adhesive tapes, pole lug welding and pole lug rubberizing are not needed). The structure of the battery cell does not need welding of positive and negative pole lugs, the battery assembly proportion is high, the flatness of the positive and negative pole pieces in the battery cell can be guaranteed, and the production efficiency is higher compared with that of the traditional production process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is an explosion structure diagram of a lithium iron phosphate ion power battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a roll core of the lithium iron phosphate power battery structure in fig. 1;
fig. 3 is a schematic structural diagram of a positive electrode connecting sheet of the lithium iron phosphate power battery structure shown in fig. 1.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
At present, the positive electrode/negative electrode of a cylindrical power battery cell on the market mostly adopts a single-pole lug or multi-pole lug structure, so that the heat dissipation requirement of the battery under the condition of high-current charging and discharging is difficult to meet, and the problems of poor cycle life of the battery, long electronic conduction path, large internal resistance of the battery and the like caused by uneven internal tension of the battery in the cycle process and non-tight contact of positive and negative pole pieces near the position of the pole lug due to poor overcurrent capacity of the pole lug and heating of the battery cell during high-current discharging exist. Moreover, the traditional mounting process of the positive and negative electrode lugs comprises the working procedures of welding, lug encapsulation and the like, the operation is complex, and the production efficiency is low. Based on this, the utility model provides a lithium iron phosphate ion power battery structure is in order to solve above-mentioned technical problem. This application simple structure, the leakproofness is good, and the cost is lower, has better reliability, and positive pole and negative pole all adopt full utmost point ear structure, and shortening electron conduction route that can be fine reduces the battery internal resistance, and the electric core problem of generating heat when improving heavy current and discharging, production simple process, production efficiency is higher.
Specifically, as shown in fig. 1 to 3, an embodiment of the present invention provides a lithium iron phosphate ion power battery structure for a cylindrical battery, including a positive electrode structure 10, a winding core 20, a negative electrode structure 30, and a case 40; the positive electrode structure 10 is arranged on the end face of one end of the winding core 20, the negative electrode structure 30 is arranged on the end face of the other end of the winding core 20, the winding core 20 is sleeved in the shell 40, and the negative electrode structure 30 is abutted against the inner surface of the bottom of the shell 40;
the positive electrode structure 10 comprises a cover cap 11, an explosion-proof sheet 12, a positive electrode connecting sheet 13, a sealing ring 14, an adhesive tape 15, a positive electrode tab 16 and an insulating gasket 17; the positive electrode tab 16 is the end surface of the winding core 20; the insulating gasket 17 is arranged on the edge of the side face of the positive electrode tab 16 far away from the winding core 20; the adhesive tape 15 is sleeved at one end of the winding core 20, and the adhesive tape 15 is respectively abutted against the positive electrode tab 16 and the insulating gasket 17; the positive electrode connecting sheet 13 is welded on the side surface of the positive electrode tab 16 far away from the winding core 20; the explosion-proof sheet 12 is welded on the side face of the positive connecting sheet 13 far away from the positive pole lug 16; the cover cap 11 is arranged on the side surface of the explosion-proof sheet 12 far away from the positive connecting sheet 13; the sealing ring 14 is sleeved on the edge of the cap 11, and the sealing ring 14 is abutted against the casing 40.
In a preferred embodiment, a circular protrusion 131 is disposed on a side surface of the positive electrode connecting sheet 13 close to the positive electrode tab 16, a plurality of first bar-shaped protrusions 132 are uniformly disposed on a side surface of the circular protrusion 131 close to the positive electrode tab 16, and the positive electrode connecting sheet 13 is welded to the positive electrode tab 16 through the first bar-shaped protrusions 132. By the arrangement, the positive connecting sheet 13 can be better contacted with the positive electrode lug 16, and the fire explosion phenomenon during welding is effectively avoided; meanwhile, the rigidity of the positive electrode connecting piece 13 can be well increased, and a good pre-pressing effect is achieved on the positive electrode tab 16.
In a preferred embodiment, a sector 133 is disposed between adjacent first linear protrusions 132, and a plurality of through holes 134 are disposed on the sector 133. In the present application, the through-hole 134 is mainly used for liquid discharge and gas exhaust.
In a preferred embodiment, a first circular hole 135 is disposed at the geometric center of the positive electrode connecting piece 13, and each first bar-shaped protrusion 132 extends from the first circular hole 135 to the edge of the positive electrode connecting piece 13. Thus, the rigidity of the positive electrode connecting piece 13 can be well secured.
In a preferred embodiment, the positive electrode connecting piece 13, the circular protrusion 131, the first bar-shaped protrusion 132, the fan-shaped surface 133, the through hole 134, and the first circular hole 135 are integrally formed. Thus, the whole positive electrode structure 10 is compact in structure and high in space utilization rate.
In the embodiment of the present application, the thickness of the first bar-shaped protrusion 132 is preferably 3mm to 5mm. Therefore, the whole positive electrode structure 10 is compact in structure and high in space utilization rate, raw material cost can be saved, and production cost can be effectively reduced.
In a preferred embodiment, the inner surface of the tape 15 is in contact with the outer periphery of the positive electrode tab 16 and the outer periphery of the insulating gasket 17, respectively. In this way, the insulating spacers 17 are fixed by the tape 15, and the insulating spacers 17 are effectively prevented from being displaced during the roll grooving process to cause a short circuit of the winding core 20.
In a preferred embodiment, a plurality of vent holes 111 are uniformly formed on the edge of the cap 11. In the present application, the cap 11 serves as an output end of the positive electrode structure 10, and can perform the functions of sealing and exhausting the top end. The seal ring 14 can effectively ensure the insulation between the positive electrode structure 10 and the negative electrode structure 30 while sealing the opening.
In a preferred embodiment, the internal pressure of the rupture disk 12 is equal to or more than 18Kg. The explosion-proof valve is opened to release pressure, and meanwhile, the explosion-proof sheet 12 is connected with the positive connecting sheet 13 in a welding mode to play a role in sealing and overflowing.
In a preferred embodiment, the negative electrode structure 30 includes a negative electrode tab 31 and a negative electrode connecting sheet 32, where the negative electrode tab 31 is an end surface of the winding core 20; the negative electrode connecting sheet 32 is welded on the side surface of the negative electrode tab 31 far away from the winding core 20; the negative connecting piece 32 abuts against the inner surface of the bottom of the case 40.
As a preferred embodiment, a plurality of second strip-shaped protrusions 321 are uniformly arranged on the side surface of the negative electrode connecting piece 32 close to the negative electrode tab 31, and a fan-shaped groove 322 is arranged between two adjacent second strip-shaped protrusions 321; the negative electrode connecting sheet 32 is welded on the negative electrode tab 31 through the second strip-shaped protrusion 321, and the negative electrode connecting sheet 32 is abutted against the inner surface of the bottom of the shell 40 through the fan-shaped groove 322.
In a preferred embodiment, a second circular hole 323 is disposed at the geometric center of the negative connecting plate 32, and each second strip-shaped protrusion 321 is disposed to extend from the second circular hole 323 to the edge of the negative connecting plate 32.
The second strip-shaped protrusion 321 and the fan-shaped groove 322 are arranged on the side surface, close to the winding core 20, of the negative electrode connecting sheet 32, so that the rigidity of the negative electrode connecting sheet 32 can be well increased, a good pre-pressing effect is achieved on the negative electrode tab 31, and the contact resistance is effectively reduced; meanwhile, the internal space of the battery can be fully utilized, and the energy density and the volume density of the battery can be effectively increased.
In a preferred embodiment, the sum of the areas of the second protrusions 321 is smaller than the sum of the areas of the fan-shaped grooves 322. Thus, the internal space of the battery can be fully utilized, and the energy density and the volume density of the battery can be effectively increased.
In a preferred embodiment, the winding core 20 is a winding core obtained by winding positive and negative electrode sheets in a winding structure; the positive pole tab 16 is obtained by flattening the positive pole end of the winding core 20 by adopting a flattening process; the negative electrode tab 31 is obtained by kneading and flattening the negative electrode end of the roll core 20 by adopting a kneading and flattening process; the positive connecting piece 13 and the negative connecting piece 32 are both connecting pieces obtained by adopting a stamping process.
In this application, anodal utmost point ear 16 and anodal connection piece 13, anodal connection piece 13 and explosion-proof piece 12, negative pole utmost point ear 31 and negative pole connection piece 32, negative pole connection piece 32 all have great welding cross-section with the casing 40 bottom, and resistance is less, can be through big electric current, consequently adopts the battery of this application structure to have that physical resistance is little, can be through the ability of big multiplying power electric current, the leakproofness and the reliability of assurance battery structure that simultaneously can be fine.
In a preferred embodiment, the cap 11 is made of a nickel-plated steel strip; the positive connecting piece 13 is a connecting piece made of aluminum; the explosion-proof sheet 12 is made of aluminum; the shell 40 is a nickel-plated steel shell; the negative electrode connecting piece 32 is a connecting piece made of copper or nickel.
The positive electrode and the negative electrode of the battery adopt the full-lug structure, so that an electronic conduction path can be effectively shortened, the internal resistance of the battery is reduced, the problem that the battery core is heated due to heavy-current discharge is solved, and the heat dissipation effect in the heavy-current charging and discharging process is good; meanwhile, the processes of welding the positive electrode lug and the negative electrode lug and encapsulating the lug in the traditional process are eliminated, and the production efficiency is improved. The positive and negative pole lugs are obtained by flattening the two ends of the roll core, so that a single-pole lug or multi-pole lug structure of a traditional cylindrical battery in the current market can be replaced, the energy density of the battery is effectively improved, the internal resistance of the battery cell is reduced, and the cost is low (the working procedures of positive and negative pole lugs, high-temperature adhesive tapes, pole lug welding and pole lug rubberizing are not needed). The structure of the battery cell does not need welding of positive and negative pole lugs, the battery assembly proportion is high, the flatness of the positive and negative pole pieces in the battery cell can be guaranteed, and the production efficiency is higher compared with that of the traditional production process.
In the embodiment of the present application, six second bar-shaped protrusions 321 and six fan-shaped grooves 322 are uniformly arranged on the negative electrode connecting sheet 32, and the second bar-shaped protrusions 321 and the fan-shaped grooves 322 are arranged at intervals. The second strip-shaped protrusion 321 and the fan-shaped groove 322 are arranged on the side surface, close to the winding core 20, of the negative electrode connecting sheet 32, so that the rigidity of the negative electrode connecting sheet 32 can be well increased, a good pre-pressing effect is achieved on the negative electrode tab 31, and the contact resistance is effectively reduced; meanwhile, the internal space of the battery can be fully utilized, and the energy density and the volume density of the battery can be effectively increased.
The utility model discloses a positive negative pole utmost point ear all adopts full utmost point ear structure, negative pole utmost point ear direct to be connected (welding) with the negative pole connection piece, the negative pole connection piece is connected (welding) with the casing, positive pole utmost point ear is direct to be connected (welding) with positive connection piece, positive connection piece is direct to be connected (welding) with explosion-proof piece, can shorten electron conduction route, reduces the battery internal resistance, improves the problem that electric core generated heat when heavy current discharges. Moreover, the strip-shaped protrusions and the fan-shaped grooves are arranged on the negative electrode connecting sheet, the strip-shaped protrusions are connected with the negative electrode tabs, and the fan-shaped grooves are connected with the bottom of the shell, so that the rigidity of the negative electrode connecting sheet can be well increased, a good prepressing effect is achieved on the negative electrode tabs, and the contact resistance is effectively reduced; meanwhile, the internal space of the battery can be fully utilized, and the energy density and the volume density of the battery can be effectively increased. The circular bulge and the strip-shaped bulge are arranged on the positive electrode connecting piece, and the positive electrode lug is connected through the strip-shaped bulge, so that the rigidity of the positive electrode connecting piece can be well increased, a good pre-pressing effect is achieved on the positive electrode lug, and the contact resistance is effectively reduced; meanwhile, the internal space of the battery can be fully utilized, the energy density and the volume density of the battery can be effectively increased, the structure is simple, the sealing performance is good, the cost is low, the reliability is good, and the problems that the overcurrent capacity of the lug of the power battery is poor, the battery core generates heat when heavy current discharges, the internal tension of the battery is uneven in the circulation process, the pole pieces near the lug position are not in tight contact, the circulation life of the battery is poor, the electronic conduction path is long, the internal resistance of the battery is large and the like can be effectively solved.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A lithium iron phosphate ion power battery structure is characterized by being used for a cylindrical battery and comprising a positive electrode structure, a roll core, a negative electrode structure and a shell; the positive electrode structure is arranged on the end face of one end of the winding core, the negative electrode structure is arranged on the end face of the other end of the winding core, the winding core is sleeved in the shell, and the negative electrode structure is abutted against the inner surface of the bottom of the shell;
the positive electrode structure comprises a cap, an explosion-proof sheet, a positive electrode connecting sheet, a sealing ring, an adhesive tape, a positive electrode lug and an insulating gasket; the positive pole lug is the end surface of the winding core; the insulating gasket is arranged on the edge of the side face, away from the winding core, of the positive electrode lug; the adhesive tape is sleeved at one end of the winding core and is respectively abutted with the positive electrode lug and the insulating gasket; the positive connecting sheet is welded on the side face, far away from the winding core, of the positive electrode lug; the explosion-proof sheet is welded on the side face, far away from the positive electrode lug, of the positive electrode connecting sheet; the cover cap is arranged on the side face, far away from the positive connecting piece, of the explosion-proof piece; the sealing ring is sleeved on the edge of the cover cap, and the sealing ring is abutted to the shell.
2. The lithium iron phosphate ion power battery structure of claim 1, wherein a circular protrusion is arranged on the side of the positive connecting piece close to the positive electrode tab, a plurality of first bar-shaped protrusions are uniformly arranged on the side of the circular protrusion close to the positive electrode tab, and the positive connecting piece is welded on the positive electrode tab through the first bar-shaped protrusions.
3. The lithium iron phosphate ion power battery structure of claim 2, wherein a sector is disposed between adjacent first bar-shaped protrusions, and a plurality of through holes are disposed on the sector;
the geometric center of the positive connecting piece is provided with a first round hole, and each first strip-shaped protrusion extends from the first round hole to the edge of the positive connecting piece.
4. The lithium iron phosphate power battery structure of claim 3, wherein the positive connecting piece, the circular protrusion, the first bar-shaped protrusion, the sector surface, the through hole, and the first round hole are integrally formed.
5. The lithium iron phosphate ion power battery structure of claim 4, wherein the inner surface of the tape abuts against the outer periphery of the positive electrode tab and the outer periphery of the insulating gasket, respectively.
6. The lithium iron phosphate ion power battery structure of claim 1, wherein a plurality of vent holes are uniformly formed in the edge of the cap; the internal pressure of the explosion-proof sheet is more than or equal to 18Kg.
7. The lithium iron phosphate ion power battery structure of claim 1, wherein the negative electrode structure comprises a negative electrode tab and a negative electrode connecting sheet, the negative electrode tab being an end face of the winding core; the negative electrode connecting sheet is welded on the side face of the negative electrode lug, which is far away from the winding core; the negative connecting sheet is abutted against the inner surface of the bottom of the shell.
8. The lithium iron phosphate ion power battery structure of claim 7, wherein a plurality of second strip-shaped protrusions are uniformly arranged on the side surface of the negative electrode connecting plate close to the negative electrode tab, and a fan-shaped groove is arranged between every two adjacent second strip-shaped protrusions; the negative electrode connecting piece is welded on the negative electrode lug through the second strip-shaped protrusions, and the negative electrode connecting piece is abutted to the inner surface of the bottom of the shell through the fan-shaped groove.
9. The lithium iron phosphate power battery structure of claim 8, wherein a second circular hole is formed in the geometric center of the negative electrode connecting piece, and each second strip-shaped protrusion extends from the second circular hole to the edge of the negative electrode connecting piece.
10. The lithium iron phosphate ion power battery structure of claim 7, wherein the roll core is a roll core obtained by winding positive and negative pole pieces by adopting a winding structure; the positive pole lug is obtained by flattening the positive pole end of the winding core by adopting a flattening process; the negative pole tab is obtained by flattening the negative pole end of the winding core by adopting a flattening process; the positive connecting piece and the negative connecting piece are both connecting pieces obtained by adopting a stamping process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221242929.1U CN217719719U (en) | 2022-05-23 | 2022-05-23 | Lithium iron phosphate ion power battery structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221242929.1U CN217719719U (en) | 2022-05-23 | 2022-05-23 | Lithium iron phosphate ion power battery structure |
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| Publication Number | Publication Date |
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| CN217719719U true CN217719719U (en) | 2022-11-01 |
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| CN202221242929.1U Active CN217719719U (en) | 2022-05-23 | 2022-05-23 | Lithium iron phosphate ion power battery structure |
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2022
- 2022-05-23 CN CN202221242929.1U patent/CN217719719U/en active Active
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