CN111403639A - Power battery with welding positive electrode and negative electrode on same side of battery core - Google Patents
Power battery with welding positive electrode and negative electrode on same side of battery core Download PDFInfo
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- CN111403639A CN111403639A CN202010238086.7A CN202010238086A CN111403639A CN 111403639 A CN111403639 A CN 111403639A CN 202010238086 A CN202010238086 A CN 202010238086A CN 111403639 A CN111403639 A CN 111403639A
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- 238000003466 welding Methods 0.000 title claims description 16
- 230000005611 electricity Effects 0.000 claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 241000270295 Serpentes Species 0.000 claims description 2
- 238000004880 explosion Methods 0.000 description 20
- 238000012545 processing Methods 0.000 description 14
- 238000005507 spraying Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009172 bursting Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a power battery with a battery cell and a welded anode and cathode at the same side, which comprises a lug, a current collecting plate, an upper cover plate, a battery cell and a lower cover plate, wherein the lug, the current collecting plate, the upper cover plate, the battery cell and the lower cover plate are arranged from top to bottom; the battery cell is fixed between the upper cover plate and the lower cover plate, and the positive electrode and the negative electrode of the battery cell are arranged on the same side; an air hole is formed in the position, corresponding to the positive electrode of the battery core, of the upper cover plate, and a through hole is formed in the position, corresponding to the negative electrode of the battery core, of the periphery of the air hole; the tab comprises an anode tab and a cathode tab, one end of the anode tab is electrically connected with the current collecting plate, the other end of the anode tab penetrates through the air hole and then is electrically connected with the anode of the battery cell, one end of the cathode tab is electrically connected with the current collecting plate, and the other end of the cathode tab penetrates through the through hole and then is electrically connected with the cathode of the battery cell. Through the positive pole and the negative pole electricity with on the homonymy of electric core connect in the current collector, make all electric core homonymies offer the nick, make all electric cores explode to spout to same direction, promote power battery's production efficiency.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a power battery with a battery core and an anode welded on the same side.
Background
Power battery is new energy automobile's power core, and the electric core that current power battery adopted mainly includes square, soft package and cylinder electricity core, and the anodal side central area that is located electric core of cylinder electricity core, and the steel casing on the electric core surface outside the anodal is all electric core negative pole. A power battery is composed of a plurality of battery cores which are connected in series and parallel, the battery cores are connected through welding electric connection parts, the electric connection parts are welded with the homopolar parts of the plurality of battery cores to be connected in parallel to form a series, and the parallel connection plate areas are connected with the plurality of battery cores with different poles in parallel to form series connection.
The safety problem of the battery has been the most concerned problem of the majority of users, and the self-ignition event of the electric vehicle also occurs frequently, which is extremely bad for the development of the electric vehicle industry. Therefore, the battery core manufacturer is usually provided with nicks on the anode of the cylindrical battery core, energy can be directionally exploded and sprayed when the battery core is exploded, the situation that the battery cores in the whole power battery are driven to generate serial explosion when a single battery core is exploded is avoided, and the damage of the battery core explosion is controllable. The traditional battery cell is welded with the electric connector through the positive and negative electrodes on the upper and lower sides respectively, and the negative electrode is connected with the positive electrodes of other battery cells through the current collecting plate to realize series connection. The grouping mode needs the adjacent series-connected cells to swing oppositely in the battery, and when a single cell is exploded and sprayed, the energy and the electrolyte of the cell can spread to other cells or electronic components, so that the explosion of the battery becomes difficult to control, external short circuit is easy to occur, continuous explosion is finally formed, and great economic loss is caused. And the current flow path in the battery is longer, and needs to run through the positive electrode and the negative electrode of the battery core, so that the integral internal resistance of the power battery is increased. Meanwhile, the positive side and the negative side of the battery core are welded with the current collecting plates, so that the battery needs to be turned back and forth during processing, the processing technology becomes complex, and the welding strength of the battery core and the electric connecting piece is easy to damage during turning.
Therefore, how to provide a power battery with uniform bursting direction of the battery core becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem that the explosion spraying directions of power batteries are not consistent due to the fact that the different ends of the positive electrode and the negative electrode of a power battery cell are arranged in the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows: the utility model provides a power battery of positive negative pole homonymy welded of electricity core, it includes:
the electrode lug, the current collecting plate, the upper cover plate, the battery cell and the lower cover plate are arranged from top to bottom;
the battery cell is fixed between the upper cover plate and the lower cover plate, and the positive electrode and the negative electrode of the battery cell are arranged on the same side;
an air hole is formed in the position, corresponding to the positive electrode of the battery cell, of the upper cover plate, and a through hole is formed in the periphery of the air hole and corresponding to the negative electrode of the battery cell;
the utmost point ear includes anodal ear and negative pole ear, anodal ear one end electricity is connected the current collector, and the other end passes behind the gas pocket with the anodal electricity of electricity core is connected, negative pole ear one end electricity is connected the current collector, and the other end passes behind the through-hole and the negative pole electricity of electricity core is connected.
Further, the negative tab comprises a conductive ring and a conductive bar which are integrally connected;
the conductive ring is arranged in a ring shape and is electrically connected with the cathode of the battery cell;
the conducting bars extend from the periphery of the conducting ring to be formed, and penetrate through the through holes to be electrically connected with the current collecting plate.
Furthermore, the conductive ring is a metal conductive ring with the conductivity of more than or equal to 40%, and the cross-sectional width of the conductive ring increases from two sides of the conductive strip to the conductive strip.
Further, the conductive ring is a 1060 type aluminum conductive ring.
Furthermore, the joint of the conductive ring and the conductive strip is also provided with a fillet.
Further, the positive electrode of the battery cell is arranged at the center of one end of the battery cell facing the upper cover plate, and the surface of the battery cell except the positive electrode is the negative electrode of the battery cell;
the collector plate includes a backbone; a positive branch and a negative branch extend from two sides of the main body respectively, the positive branch is electrically connected with the positive tab, and the negative branch is electrically connected with the negative tab;
the positive branch and the negative branch are used for connecting a plurality of battery cores in parallel, and the trunk is used for transmitting current from the positive branch to the negative branch or transmitting current from the negative branch to the positive branch.
Furthermore, the trunk, the positive branch and the negative branch of the collector plate are arranged in a snake shape, the upper through hole of the upper cover plate and the air hole gap are alternately arranged, and the minimum distance between the collector plate and the air hole is not less than 0.5 mm.
Furthermore, the negative electrode lug and the negative branch are obliquely arranged, and the negative electrode lug is arranged at an included angle of 40-50 degrees relative to the extending direction of the negative branch.
Furthermore, the current collecting plate and the pole lugs are welded by laser or ultrasonic.
Further, an insulating protection ring is arranged between a negative electrode lug and a positive electrode lug at one end of the positive electrode of the battery cell.
Has the advantages that: the invention provides a power battery with a battery cell and a welded anode and cathode at the same side, which comprises a lug, a current collecting plate, an upper cover plate, a battery cell and a lower cover plate, wherein the lug, the current collecting plate, the upper cover plate, the battery cell and the lower cover plate are arranged from top to bottom; the battery cell is fixed between the upper cover plate and the lower cover plate, and the positive electrode and the negative electrode of the battery cell are arranged on the same side; an air hole is formed in the position, corresponding to the positive electrode of the battery core, of the upper cover plate, and a through hole is formed in the position, corresponding to the negative electrode of the battery core, of the periphery of the air hole; the tab comprises an anode tab and a cathode tab, one end of the anode tab is electrically connected with the current collecting plate, the other end of the anode tab penetrates through the air hole and then is electrically connected with the anode of the battery cell, one end of the cathode tab is electrically connected with the current collecting plate, and the other end of the cathode tab penetrates through the through hole and then is electrically connected with the cathode of the battery cell. The power battery adopting the welding of the positive electrode and the negative electrode of the battery core at the same side has the following effects: 1. the welding of the battery core of the power battery and the current collecting plate at the same side is realized, and the explosion spraying direction of the battery core can be effectively unified; 2. the current collecting plate and the electrode lug have enough width, and can be processed by laser or ultrasonic welding, so that the processing efficiency can be greatly improved, and the design period can be shortened; 3. the processing technology of the power battery is simpler, and the processing strength of the battery cell can be prevented from being damaged when the battery cell turns over after being welded; 4. the series-parallel connection requirements of the design of the battery cells in different power batteries can be met, the flexible design is realized, and the parallel number of the battery cells can be changed by modifying the number of the battery cells which are inserted by the current collecting plates; 5. the power battery has excellent explosion-proof performance as a whole, insulation protection is arranged between the positive electrode and the negative electrode, and a certain safety distance is reserved between the current collecting plate and the air hole, so that the situation that a single battery cell endangers other battery cells to form chain explosion during explosion spraying can be effectively avoided; 6. after electric core homonymy is connected among the power battery, can be equipped with the nick with electric core positive pole or negative pole, when making electric core explode to spout, all electric cores explode to the formulation direction and spout, are convenient for control electric core and explode the risk of spouting.
Drawings
Fig. 1 is a schematic perspective view of a power battery with electrodes and cathodes welded on the same side;
fig. 2 is a schematic diagram of a three-dimensional explosion of a power battery provided in the invention, in which positive and negative electrodes of a battery core are welded on the same side;
fig. 3 is a schematic diagram of a matching relationship between a current collecting plate, an upper cover plate and tabs of a power battery provided by the invention, wherein the current collecting plate, the upper cover plate and the tabs are welded on the same side of the positive electrode and the negative electrode of the battery core;
fig. 4 is a schematic diagram of a three-dimensional structure of an upper cover plate of a power battery with electrodes and cathodes welded on the same side;
fig. 5 is a schematic diagram of a matching relationship between a battery core, an insulating protection ring and a tab of a power battery provided by the invention, wherein the battery core, the insulating protection ring and the tab are welded on the same side of the positive electrode and the negative electrode of the battery core;
fig. 6 is a schematic diagram of a three-dimensional structure of a negative electrode tab of a power battery provided by the invention, wherein the negative electrode tab is welded on the same side of the positive electrode and the negative electrode of the battery core;
fig. 7 is a schematic sectional view illustrating the installation of tabs of a power battery welded on the same side of the positive electrode and the negative electrode of a battery core provided in the present invention;
description of reference numerals:
10. the power battery is welded on the same side of the positive electrode and the negative electrode of the battery core; 11. a tab; 12. a collector plate; 13. an upper cover plate; 14. an electric core; 15. a lower cover plate; 16. an insulating protection ring; 111. a positive tab; 112. a negative tab; 113. a conductive ring; 114. a conductive strip; 115. round corners; 121. a trunk; 122. a positive branch; 123. a negative branch; 131. air holes; 132. a through hole; 141. a positive electrode; 142. and a negative electrode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order that the objects and advantages of the invention will be more clearly understood, the invention will now be described in detail with reference to the following examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed. As used herein, the terms "parallel" and "perpendicular" are not limited to their strict geometric definitions, but include tolerances for machining or human error, reasonable and inconsistent.
Power battery is new energy automobile's power core, and the electric core that current power battery adopted mainly includes square, soft packet of and cylinder electricity core, and a power battery comprises many electricity core series-parallel connections, is connected through welding electric connecting component between electricity core and the electricity core, and electric connecting component welds with the homopolar realization of a plurality of electricity cores and connects in parallel and form a string, and parallelly connected piece district is connected with the parallelly connected electric core of a plurality of heteropolars again and is formed the series connection. Meanwhile, the safety problem of the battery is always the most concerned problem of the majority of users, and the spontaneous combustion event of the electric vehicle also frequently occurs, which is extremely bad for the development of the electric vehicle industry. Therefore, the battery core manufacturer is usually provided with nicks on the anode of the cylindrical battery core, energy can be directionally exploded and sprayed when the battery core is exploded, the situation that the battery cores in the whole power battery are driven to generate serial explosion when a single battery core is exploded is avoided, and the damage of the battery core explosion is controllable. The traditional battery cell is welded with the electric connector through the positive and negative electrodes on the upper and lower sides respectively, and the negative electrode is connected with the positive electrodes of other battery cells through the current collecting plate to realize series connection. The grouping mode needs the adjacent series-connected cells to swing oppositely in the battery, and when a single cell is exploded and sprayed, the energy and the electrolyte of the cell can spread to other cells or electronic components, so that the explosion of the battery becomes difficult to control, external short circuit is easy to occur, continuous explosion is finally formed, and great economic loss is caused. And the current flow path in the battery is longer, and needs to run through the positive electrode and the negative electrode of the battery core, so that the integral internal resistance of the power battery is increased. Meanwhile, the positive side and the negative side of the battery core are welded with the current collecting plates, so that the battery needs to be turned back and forth during processing, the processing technology becomes complex, and the welding strength of the battery core and the electric connecting piece is easy to damage during turning. Based on the technical problem, the invention provides the power battery with the same side welding of the positive electrode and the negative electrode of the battery cell, and the power battery is only provided with the current collecting plate, and the positive electrode and the negative electrode on the same side of the battery cell are electrically connected to the current collecting plate, so that nicks can be formed on one ends of all the battery cells of the power battery, which are far away from the current collecting plate, when the battery cells are subjected to explosion spraying, all the battery cells uniformly perform explosion spraying in the same direction, and the risk of explosion spraying of the battery cells is convenient to control; meanwhile, the processing technology of the power battery is simpler, the electric core is prevented from being overturned back and forth during welding, and further the processing strength is prevented from being damaged.
Referring to fig. 1 to 7, in a first embodiment of the present invention, a power battery 10 with a core and an anode welded on the same side is provided, which includes: the battery comprises a tab 11, a current collecting plate 12, an upper cover plate 13, a battery cell 14 and a lower cover plate 15, wherein the tab 11, the current collecting plate 12, the upper cover plate 13, the battery cell 14 and the lower cover plate 15 are arranged from top to bottom; the battery cell 14 is fixed between the upper cover plate 13 and the lower cover plate 15, and the positive electrode 141 and the negative electrode 142 of the battery cell 14 are arranged on the same side; an air hole 131 is formed in the position, corresponding to the positive electrode 141 of the battery cell 14, of the upper cover plate 13, and a through hole 132 is formed in the periphery of the air hole 131, corresponding to the negative electrode 142 of the battery cell 14; specifically, a plurality of air holes 131 and through holes 132 are formed in the upper cover plate 13 of the power battery 10 welded on the same side of the positive electrode and the negative electrode of the battery core, the position of each air hole 131 corresponds to the positive electrode 141 of one battery core 14, and the position of each through hole 132 corresponds to the negative electrode 142 of the battery core 14; the tab 11 comprises a positive tab 111 and a negative tab 112, one end of the positive tab 111 is electrically connected with the current collecting plate 12, the other end of the positive tab passes through the air hole 131 and then electrically connected with the positive electrode 141 of the battery cell 14, one end of the negative tab 112 is electrically connected with the current collecting plate 12, and the other end of the negative tab passes through the through hole 132 and then electrically connected with the negative electrode 142 of the battery cell 14.
It can be understood that, in the invention, the positive electrode 141 and the negative electrode 142 of the battery cell 14 of the power battery 10, which are welded on the same sides of the positive electrode and the negative electrode of the battery cell, are electrically connected to the current collecting plate 12, only one layer of current collecting plate 12 is arranged in the power battery, and the positive electrode 141 and the negative electrode 142 on the same side of the battery cell 14 are electrically connected to the current collecting plate 12, so that notches can be formed on the ends of all the battery cells 14 of the power battery, which are away from the current collecting plate 12, so that when the battery cells 14 are subjected to blowout, all the battery cells 14 are subjected to blowout in the same direction, and; meanwhile, the processing technology of the power battery is simpler, the battery core 14 is prevented from being overturned back and forth during welding, the processing strength is prevented from being damaged, and the service life and the safety of the power battery are guaranteed.
Further, the positive electrode 141 of the battery cell 14 is disposed at the center of one end of the battery cell 14 facing the upper cover plate 13, and the surface of the battery cell 14 other than the positive electrode 141 is the negative electrode 142 of the battery cell 14; that is, the positive electrode 141 and the negative electrode 142 of the battery cell 14 in the present invention are disposed on the same side, the whole steel casing on the exterior of the battery cell 14 of the power battery 10 welded on the same side of the positive electrode and the negative electrode of the battery cell is the negative electrode 142 of the battery cell 14, and the positive electrode 141 of the battery cell 14 is disposed at the center of one end of the battery cell 14 facing the current collecting plate 12.
In some preferred embodiments, the negative tab 112 includes a conductive loop 113 and a conductive strip 114 integrally connected; the conductive ring 113 is arranged in a ring shape and is electrically connected with the negative electrode 142 of the battery cell 14; the conductive strip 114 extends from the periphery of the conductive ring 113, and is electrically connected to the current collecting plate 12 after passing through the through hole 132.
It can be understood that the negative electrode 142 at the end where the positive electrode 141 of the battery cell 14 of the power battery is located is a hollow ring shape, the negative electrode tab 112 is provided as the conductive ring 113 and the conductive strip 114 which are integrally arranged, and then the region of the negative electrode 142 correspondingly contacts the positive electrode 141 of the battery cell 14 through the conductive ring 113, so that the contact stability between the negative electrode tab 112 and the negative electrode 142 of the battery cell 14 is improved, and meanwhile, the current collecting plate 12 is electrically connected to the battery cell 14 by providing the conductive strip 114.
In some preferred embodiments, the conductive loop 113 is a metal conductive loop 113 with a conductivity of 40% or more, and the cross-sectional width of the conductive loop 113 increases from two sides of the conductive strip 114 to the conductive strip 114.
It can be understood that the cross-sectional width of the conductive loop 113 is largest at the joint of the conductive loop 113 and the conductive strip 114, specifically, the cross-sectional width of the conductive loop 113 gradually increases from a position away from the conductive strip 114 to the conductive strip 114, thereby effectively improving the current carrying capacity at the current junction. The conductive ring 113 is set as a metal conductive ring, and the conductivity is controlled, so that the heat effect of the current in the power battery is effectively reduced, the charge and discharge energy loss is also effectively reduced, and the problem of battery temperature rise is reduced.
In some embodiments, the conductive loop 113 is a 1060 type aluminum conductive loop. The conductive ring 113 is made of 1060 type aluminum material, so that the cost of the negative electrode tab 112 and the power battery is effectively reduced, and the conductivity of the negative electrode tab 112 is ensured.
In other preferred embodiments, the joint of the conductive loop 113 and the conductive strip 114 is further provided with a rounded corner 115. Through setting up fillet 115, and then the effectual bonding strength who promotes conductive ring 113 and conducting bar 114, promoted negative pole ear 112's intensity, ensured power battery's life and security.
In some preferred embodiments, the collector plate 12 includes a backbone 121; a positive branch 122 and a negative branch 123 extend from two sides of the main body 121 respectively, the positive branch 122 is electrically connected with the positive tab 111, and the negative branch 123 is electrically connected with the negative tab 112; the positive branch 122 and the negative branch 123 are used for connecting a plurality of battery cells 14 in parallel, and the trunk 121 is used for transmitting current from the positive branch 122 to the negative branch 123 or transmitting current from the negative branch 123 to the positive branch 122.
Further, the main body 121, the positive branch 122 and the negative branch 123 of the current collecting plate 12 are arranged in a serpentine shape, and are installed along the through hole 132 and the air hole 131 on the upper cover plate 13 in a clearance-inserting manner, and the minimum distance between the current collecting plate 12 and the air hole 131 is not less than 0.5 mm.
It can be understood that the current collecting plate 12 is provided with a plurality of stems 121, and negative branches 123 and positive branches 122 respectively extend from two opposite sides of the stems 121, the negative branches 123 are connected to the same side of the stems 121, the positive branches 122 are connected to the same side of the stems 121, and the negative branches 123 and the positive branches 122 are arranged at intervals; then, the plurality of battery cells 14 are connected in parallel through the positive branch 122 or the negative branch 123, and then, the battery cells 14 on the plurality of positive branches 122 and the plurality of negative branches 123 are connected in series through the trunk 121; meanwhile, the problem of flexible design of the number of the series-parallel connection of the battery cores 14 in the power battery is effectively solved; meanwhile, the positive and negative branches 123 can extend along the gaps between the air holes 131 and the through holes 132 to further meet various series-parallel connection design requirements; further, by ensuring that the minimum distance between the current collecting plate 12 and the air hole 131 is not less than 0.5mm, the permeability of the air hole 131 is further ensured, when the electric core 14 is subjected to blowout, the air hole 131 timely exhausts the gas, the electric core 14 in the power battery is effectively prevented from being short-circuited by lifting the current collecting plate 12 when the electric core 14 is subjected to blowout, the situation that the single electric core 14 endangers other electric cores 14 to form chain explosion when the single electric core 14 is exploded is effectively avoided, and the explosion-proof performance of the power battery is remarkably improved.
In other preferred embodiments, the negative tab 112 and the negative branch 123 are disposed obliquely, and the negative tab 112 is disposed at an angle of 40 ° to 50 ° with respect to the extending direction of the negative branch 123. By controlling the angular position relationship between the negative tab 112 and the negative branch 123, the through hole 132 effectively avoids the current collecting plate 12, so that the current collecting plate 12 has a sufficient width to ensure the current carrying capacity, and the soldering process between the tab 11 and the current collecting plate 12 is also facilitated.
Further, the current collecting plate 12 and the tab 11 are welded by laser or ultrasonic; preferably, the current collecting plate 12 and the tab 11 are preferably laser welded. And then the processing efficiency of the power battery is obviously improved.
In some preferred embodiments, an insulating guard ring 16 is further disposed on one end of the positive electrode 141 of the battery cell 14 between the negative electrode tab 112 and the positive electrode tab 111. By arranging the insulating protection ring 16, short circuit between the positive electrode 142 and the negative electrode 142 of the battery cell 14 is effectively avoided, and the safe operation of the power battery is guaranteed.
In some embodiments, the power battery discharges, and current is transmitted from the negative electrode 142 and the negative electrode tab 112 of the plurality of cells 14 on one negative branch 123 to the positive branch of the current collecting plate 12; then, the current is transmitted to the adjacent positive branch 122 through the main branch of the current collecting plate 12, then transmitted to the riding positive lug 111 through the positive branch 122, transmitted to the positive pole 141 of the electric core 14 through the positive lug 111, and after the current enters the electric core 14, the current penetrates through the negative pole 142 steel shell from the positive pole 141 of the electric core 14 to the periphery of the electric core 14, and finally the current is led to the next negative branch 123 of the current collecting plate 12 through the negative pole lug 112 from the negative pole 142 area on the same side with the positive pole 141.
In other embodiments, the power battery is charged, and the flow direction of the current inside the power battery is opposite; the current is transmitted from the positive electrodes 141 and the positive electrode tabs 111 of the plurality of battery cells 14 on the positive branch 122 to the trunk 121 of the current collecting plate 12, and then transmitted to the negative branch 123 through the trunk 121; then transmitted to the riding-on negative tab 112 through the negative branch 123, and then transmitted to the negative electrode 142 of the cell 14 through the negative tab 112, after the current enters the cell 14, the current penetrates from the negative electrode 142 of the cell 14 to the positive electrode 141 of the cell 14, and finally the current is guided from the positive electrode 141 to the next positive branch 122 of the current collecting plate 12 through the positive tab 111.
In summary, the power battery with the battery cell welded on the same side of the positive electrode and the negative electrode provided by the invention comprises a tab, a current collecting plate, an upper cover plate, a battery cell and a lower cover plate which are arranged from top to bottom; the battery cell is fixed between the upper cover plate and the lower cover plate, the positive electrode of the battery cell is arranged at the center of one end of the battery cell, which faces the upper cover plate, and the surface of the battery cell, except the positive electrode, is the negative electrode of the battery cell; an air hole is formed in the position, corresponding to the positive electrode of the battery cell, of the upper cover plate, and a through hole is formed in the periphery of the air hole and corresponding to the negative electrode of the battery cell; the utmost point ear includes anodal ear and negative pole ear, anodal ear one end electricity is connected the current collector, and the other end passes behind the gas pocket with the anodal electricity of electricity core is connected, negative pole ear one end electricity is connected the current collector, and the other end passes behind the through-hole and the negative pole electricity of electricity core is connected. Only one layer of current collecting plate is arranged in the power battery, and the positive electrode and the negative electrode on the same side of the battery cell are electrically connected to the current collecting plate, so that nicks can be formed on one ends of all the battery cells of the power battery, which are far away from the current collecting plate, and when the battery cells are subjected to explosion spraying, all the battery cells are subjected to explosion spraying in the same direction, so that the risk of the explosion spraying of the battery cells is controlled conveniently; meanwhile, the processing technology of the power battery is simpler, the electric core is prevented from being overturned back and forth during welding, the processing strength is further damaged, and the service life and the safety of the power battery are guaranteed.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a positive negative pole homonymy welded power battery of electricity core which characterized in that includes:
the electrode lug, the current collecting plate, the upper cover plate, the battery cell and the lower cover plate are arranged from top to bottom;
the battery cell is fixed between the upper cover plate and the lower cover plate, and the positive electrode and the negative electrode of the battery cell are arranged on the same side;
an air hole is formed in the position, corresponding to the positive electrode of the battery cell, of the upper cover plate, and a through hole is formed in the periphery of the air hole and corresponding to the negative electrode of the battery cell;
the utmost point ear includes anodal ear and negative pole ear, anodal ear one end electricity is connected the current collector, and the other end passes behind the gas pocket with the anodal electricity of electricity core is connected, negative pole ear one end electricity is connected the current collector, and the other end passes behind the through-hole and the negative pole electricity of electricity core is connected.
2. The power battery with the welding of the positive electrode and the negative electrode on the same side of the battery core as the claim 1,
the negative electrode tab comprises a conductive ring and a conductive bar which are integrally connected;
the conductive ring is arranged in a ring shape and is electrically connected with the cathode of the battery cell;
the conducting bars extend from the periphery of the conducting ring to be formed, and penetrate through the through holes to be electrically connected with the current collecting plate.
3. The power battery with the electric core welded on the same side as the positive electrode and the negative electrode of the battery cell is characterized in that the conductive ring is a metal conductive ring with the conductivity of more than or equal to 40%, and the width of the cross section of the conductive ring increases from two sides of the conductive strip to the conductive strip.
4. The power battery with the welded positive electrode and negative electrode on the same side as the battery core in the claim 2 is characterized in that the conductive ring is a 1060 type aluminum conductive ring.
5. The power battery with the electric core welded on the same side as the positive electrode and the negative electrode is characterized in that a joint of the conductive ring and the conductive strip is further provided with a fillet.
6. The power battery with the battery core welded on the same side as the anode and the cathode of the battery core according to claim 1, wherein the anode of the battery core is arranged at the center of one end, facing the upper cover plate, of the battery core, and the surface of the battery core, except the anode, is the cathode of the battery core;
the collector plate includes a backbone; a positive branch and a negative branch extend from two sides of the main body respectively, the positive branch is electrically connected with the positive tab, and the negative branch is electrically connected with the negative tab;
the positive branch and the negative branch are used for connecting a plurality of battery cores in parallel, and the trunk is used for transmitting current from the positive branch to the negative branch or transmitting current from the negative branch to the positive branch.
7. The power battery with the electric core welded on the same side as the positive electrode and the negative electrode of the electric core welded on the same side as the electric core of claim 6, wherein the main body, the positive branches and the negative branches of the current collecting plate are arranged in a snake shape and are inserted and installed along the upper through hole and the air hole gap of the upper cover plate, and the minimum distance between the current collecting plate and the air hole is not less than 0.5 mm.
8. The power battery with the battery core and the anode and the cathode welded on the same side as each other according to claim 6, wherein the cathode tab and the negative branch are obliquely arranged, and the cathode tab forms an included angle of 40-50 degrees with respect to the extending direction of the negative branch.
9. The power battery with the battery core and the anode and the cathode welded on the same side as each other according to claim 1, wherein the current collecting plate and the tabs are welded by laser welding or ultrasonic welding.
10. The power battery with the electric core welded on the same side as the positive pole and the negative pole of the electric core according to any one of claims 1 to 9, wherein an insulating protection ring is further arranged between the negative pole lug and the positive pole lug.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010238086.7A CN111403639A (en) | 2020-03-30 | 2020-03-30 | Power battery with welding positive electrode and negative electrode on same side of battery core |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010238086.7A CN111403639A (en) | 2020-03-30 | 2020-03-30 | Power battery with welding positive electrode and negative electrode on same side of battery core |
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| CN202010238086.7A Pending CN111403639A (en) | 2020-03-30 | 2020-03-30 | Power battery with welding positive electrode and negative electrode on same side of battery core |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111952525A (en) * | 2020-08-20 | 2020-11-17 | 华霆（合肥）动力技术有限公司 | Homonymy mass flow device, battery module and electric motor car |
| CN114122599A (en) * | 2021-11-13 | 2022-03-01 | 安徽江淮汽车集团股份有限公司 | Battery module |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911628A (en) * | 2019-11-29 | 2020-03-24 | 安徽江淮汽车集团股份有限公司 | Power battery |
-
2020
- 2020-03-30 CN CN202010238086.7A patent/CN111403639A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911628A (en) * | 2019-11-29 | 2020-03-24 | 安徽江淮汽车集团股份有限公司 | Power battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111952525A (en) * | 2020-08-20 | 2020-11-17 | 华霆（合肥）动力技术有限公司 | Homonymy mass flow device, battery module and electric motor car |
| CN114122599A (en) * | 2021-11-13 | 2022-03-01 | 安徽江淮汽车集团股份有限公司 | Battery module |
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