CN107895762B - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN107895762B CN107895762B CN201711194471.0A CN201711194471A CN107895762B CN 107895762 B CN107895762 B CN 107895762B CN 201711194471 A CN201711194471 A CN 201711194471A CN 107895762 B CN107895762 B CN 107895762B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 16
- 239000004020 conductor Substances 0.000 claims abstract description 44
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 210000004027 cell Anatomy 0.000 description 53
- 238000009434 installation Methods 0.000 description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 125000003003 spiro group Chemical group 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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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
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
-
- 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
- H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
- H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
-
- 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
- H01M50/271—Lids or covers for the racks or secondary casings
-
- 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
- H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
-
- 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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a lithium ion battery, and belongs to the technical field of battery equipment. The existing battery has poor heat dissipation effect, and the battery core is easy to hollowly. A lithium ion battery comprises a battery core, a battery shell for accommodating the battery core and a battery cover covering the battery shell, wherein a bracket for fixing a plurality of battery cores is arranged in the battery shell. The battery cover penetrates through the pole, the battery cover is fixedly connected with the pole, and the lower end of the pole is connected with an electric conductor used for connecting the electrode base. The bracket is arranged to fix the electric core group, so that the electric core group is reliably fixed together without shaking and hollowing; the end covers are arranged to isolate the lugs of the electric core group, so that the short circuit of a circuit can be effectively avoided, and the electric cores can be safely attached together, so that the electric core group has reasonable layout and compact structure.
Description
Technical Field
The invention relates to a lithium ion battery, and belongs to the technical field of battery equipment.
Background
The lithium battery applied to vehicle starting in the current market is few, the battery core of the lithium battery is usually composed of a cylinder, a square and the like, and the existing scheme is single in structure or too complex. The existing cylindrical battery cell has small single particle capacity and a large number of series-parallel connection, and is not beneficial to structural arrangement. The single capacity of the existing square battery cell is larger, and the arrangement is also not beneficial. Especially for series products, the prior art schemes are difficult to plan. For a power machine such as an automobile requiring a large current, a plurality of battery cells need to be connected in series or in parallel, and a plurality of groups of adapter plates or adapter wires are used for connection, and no planned arrangement and connection mode is provided, so that the overall occupied space is increased, a series of products are difficult to achieve, and the production cost is also increased. Moreover, the starting current of the battery is required to be large, the instantaneous power is large, the connection mode between the battery cores is connected through the adapter plate, more heat can be generated in the charging and discharging process of the lithium battery, the heat cannot be dissipated in time, the related protection structure can be melted, the circuit is short-circuited, and certain potential safety hazards exist.
To solve the above problems, chinese patent application No. CN201220146826.5 discloses a lithium battery module, which comprises a battery case, a cover plate of the battery case is provided with a positive electrode conductive post and a negative electrode conductive post, a casing is combined with the bottom end of the cover plate, a first positioning area and a second positioning area are arranged in the casing, a partition board is arranged between the first positioning area and the second positioning area, the second positioning area is located below the positive electrode conductive post and the negative electrode conductive post, and the first positioning area is provided with a plurality of positioning plates with intervals, so that when a plurality of battery cells are placed in the first positioning area, any two battery cells are positioned by the positioning plates in an isolated manner, and a certain distance is formed between the plurality of battery cells and the positive electrode conductive post and the negative electrode post, thereby ensuring the safety in use.
Above-mentioned technical scheme sets up with the help of the locating plate keeps apart arbitrary two electric cores of location, ensures safe in utilizationly, is convenient for simultaneously the heat dissipation, but this kind of scheme makes the lithium cell bulky, and electric core rocks easily, and the electric core side does not laminate mutually with the casing lateral wall, takes place the hollowing easily.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the lithium ion battery which has reasonable layout and compact structure, is convenient for the heat dissipation of the electric core group, avoids the hollowing of the electric core and is convenient for achieving series products and has no potential safety hazard.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a lithium ion battery comprises a battery core, a battery shell for accommodating the battery core and a battery cover covering the battery shell, wherein a support for fixing a plurality of battery cores is arranged in the battery shell, the support is of a frame structure, and the side surface of the support is connected with a compression plate for compressing the side surface of the battery core.
An end cover is erected above the support, the end cover is provided with a bus bar area, and the bus bar area comprises a parallel area used for penetrating a plurality of homopolar lugs and a series area used for penetrating a plurality of positive and negative lugs. And an insulating wall is arranged at the boundary of the zones.
The battery cover penetrates through the pole, the battery cover is fixedly connected with the pole, and the lower end of the pole is connected with an electric conductor used for connecting the electrode base.
The battery case is characterized in that a plurality of battery cells are fixed together by the support, and then the battery cells are placed in the battery case together, the support and the side plate of the battery case keep a certain distance, so that heat dissipation is facilitated, and meanwhile, the support is of a frame structure, so that heat of the battery cells is volatilized in time; set up the side that the pressure strip compressed tightly electric core, avoid electric core hollowing, pressure strip and frame spiro union, convenient dismantlement, after the frame was placed to electric core, install the pressure strip on the frame again for the pressure strip can closely laminate with the side of electric core, and the structure is practical, and the scheme is tangible.
The invention arranges the end covers to place the battery cores in groups, places the battery core lugs needing to be connected in parallel in the parallel area, places the battery core lugs needing to be connected in series in the series area, reasonably plans the connection layout of the battery cores, and simultaneously arranges the insulating wall to isolate the positive and negative poles of the battery cores, thereby avoiding the short circuit of the circuit and leading the structure to be compact.
But utmost point post and battery cover integrated injection moulding compare the utmost point post and be fixed in the inside scheme of battery, and the position of utmost point post is stable relatively, and the installation of the battery cover of being convenient for need not rectify utmost point post mounted position, has improved the installation accuracy and the assembly efficiency of battery cover. The electric conductor is arranged on the pole column and the electrode holder, the length of the electric conductor can be flexibly set as required, the installation position of the pole column and the battery cell is adjustable, the interval between the pole column and the electrode holder can be set far, and heat dissipation is facilitated. Compared with the welding in the prior art, the electric conductor is respectively connected with the pole and the electrode base in a threaded mode, the ductility of the electric conductor is improved, the anti-seismic effect is good, and the joint is not prone to failure.
The bracket is arranged to fix the electric core group, so that the electric core group is reliably fixed together without shaking and hollowing; the end covers are arranged to isolate the lugs of the electric core group, so that the short circuit of a circuit can be effectively avoided, and the electric cores can be safely attached together, so that the electric core group has reasonable layout and compact structure.
As a preferable technical measure, the compression plate is of a sheet structure with a folded edge, and a plurality of through holes for screwing the frame are formed in the periphery of the folded edge. The main structure of the pressure strip is placed in the side hole of the frame, and is abutted against the side surface of the battery cell, and the pressure strip can be directly abutted against the side surface of the battery cell, and can also be indirectly abutted against the side surface of the battery cell through other protection structures, and the folded edge is arranged to be convenient for fixing with the frame.
As a preferable technical measure, the battery cell is afraid of local extrusion, the folded edge extends to the outer side of the outer surface of the frame, the battery cell and the folded edge are fixedly connected through the fastening assembly, the inner wall surface of the frame can be kept flat, the battery cell is prevented from being locally extruded, and the fastening assembly comprises a bolt and a nut.
As a preferable technical measure, the bolt is fixed on the outer surface of the frame and sequentially penetrates through the through hole of the folded edge and the fastening nut matched with the bolt, and the fastening nut screws the compression plate on the frame. Because bolt length is longer, be convenient for adjust the elasticity that the pressure strip contradicts electric core, can select in a flexible way as required, the structure is practical, thinks about ingeniously.
As a preferable technical measure, the insulating wall stands in a bus bar area, so that the lugs in different areas can be isolated from each other, and the short circuit of a circuit can be effectively avoided. The insulation walls are arranged transversely and longitudinally along the dividing area and comprise transverse insulation walls arranged transversely and longitudinal insulation walls arranged longitudinally.
Preferably, the transverse insulating wall is arranged centrally along the end cap, dividing the end cap into two parts. The longitudinal insulating walls extend from the lateral sides of the transverse insulating walls to the edges of the end caps to form the busbar region. Different lugs are arranged in different areas in a penetrating mode, and then the installation position of the battery cell is determined, so that the battery cell is reasonable in layout, and the installation efficiency of the battery cell is improved.
As a preferable technical measure, a base used for installing a circuit board is arranged in the middle of the transverse insulating wall, and electrode seats used for connecting lugs are arranged at two ends of the transverse insulating wall. And threaded cylinders for screwing the circuit board are arranged on the periphery of the base. The electrode holder tip sets up the mounting hole that is used for the spiro union electric conductor, and for save material and reduction occupation space, base and electrode holder are the sheet structure respectively, and the effective spiro union of unable and other spare parts carries out the spiro union with other spare parts, consequently sets up screw thread cylinder or nut spare, simple structure, practicality.
As a preferable technical measure, the electric conductor is in a sheet shape, through holes are respectively formed in two ends of the electric conductor, the through holes comprise a first through hole used for screwing the polar column and a second through hole used for screwing the electrode holder, and the fastener penetrates through the through holes of the electric conductor to be respectively screwed with the polar column and the electrode holder, so that the connection of the three is more reliable, the anti-seismic effect is good, and the electric conductor is not easy to lose efficacy.
As a preferable technical measure, because the electrode holder of the battery cell is placed in the battery case, the battery cover is also a shell, the battery cover is buckled in the battery case, in order to install the electric conductor, the first through hole penetrates through the first fastener from the lower part, and the second through hole penetrates through the second fastener from the upper part, the difficult problem that the electric conductor is difficult to install and fix is solved. The battery cover is provided with a through hole adjacent to the pole, and the second fastener sequentially penetrates through the through hole and the second through hole to screw the electric conductor on the electrode seat. The tightening tool penetrates through the through hole to drive the fastener to be tightened on the connecting nut of the electrode seat, and then the electric conductor is fixed on the electrode seat.
The protection circuit module is used for preventing overcharge and overdischarge, one end of the protection circuit module is connected with the electric conductor, and the other end of the protection circuit module is connected with the electrode holder, so that the battery cell is prevented from being damaged due to overcharge of the battery cell by an external power supply. The protection circuit module is provided with the over-discharge prevention part at the same time, when the voltage of the battery cell is too low, the over-discharge prevention part is disconnected, the discharge circuit is disconnected, the external discharge is stopped, and the service life of the battery cell is prolonged. The protection circuit module can adopt a precision lithium battery to protect IC-S8211D series circuit chips, and the circuit chips have overcharge and overdischarge protection mechanisms, are mature in technology and convenient to purchase, and can reduce research and development cost and manufacture cost.
The conductor is provided with a safety part which can be fused when encountering overlarge current, and the width of the safety part is smaller than that of the main structure of the conductor. Set up the insurance portion on the electric conductor, after utmost point post and electrode holder transshipped for a long time, can produce more heat, the temperature of electric conductor risees, reaches the certain degree when the temperature, and the fusing of insurance portion breaks off the connection of utmost point post and electrode holder, protects whole circuit.
Compared with the prior art, the invention has the following beneficial effects:
the battery case is characterized in that a plurality of battery cells are fixed together by the support, and then the battery cells are placed in the battery case together, the support and the side plate of the battery case keep a certain distance, so that heat dissipation is facilitated, and meanwhile, the support is of a frame structure, so that heat of the battery cells is volatilized in time; set up the side that the pressure strip compressed tightly electric core, avoid electric core hollowing, pressure strip and frame spiro union, convenient dismantlement, after the frame was placed to electric core, again install the pressure strip on the frame for the pressure strip can closely laminate with the side of electric core, and the structure is convenient for reach a series of products, and the structure is practical, and the scheme is tangible.
The invention arranges the end covers to place the battery cores in groups, places the battery core lugs needing to be connected in parallel in the parallel area, places the battery core lugs needing to be connected in series in the series area, reasonably plans the connection layout of the battery cores, and simultaneously arranges the insulating wall to isolate the positive and negative poles of the battery cores, thereby avoiding the short circuit of the circuit and leading the structure to be compact.
But utmost point post and battery cover integrated injection moulding compare the utmost point post and be fixed in the inside scheme of battery, and the position of utmost point post is stable relatively, and the installation of the battery cover of being convenient for need not rectify utmost point post mounted position, has improved the installation accuracy and the assembly efficiency of battery cover. The electric conductor is arranged on the pole column and the electrode holder, the length of the electric conductor can be flexibly set as required, the installation position of the pole column and the battery cell is adjustable, the interval between the pole column and the electrode holder can be set far, and heat dissipation is facilitated. Compared with the welding in the prior art, the electric conductor is respectively connected with the pole and the electrode base in a threaded mode, the ductility of the electric conductor is improved, the anti-seismic effect is good, and the joint is not prone to failure.
The bracket is arranged to fix the electric core group, so that the electric core group is reliably fixed together without shaking and hollowing; the end covers are arranged to isolate the lugs of the cell group, so that the short circuit of a circuit can be effectively avoided, potential safety hazards do not exist, and the cells can be safely attached together, so that the cell group has reasonable layout and compact structure.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural diagram of a battery cell;
FIG. 3 is a schematic view of the structure of the present invention for converting a certain angle;
FIG. 4 is a schematic view of a stent structure according to the present invention;
FIG. 5 is a schematic view of the orientation of the structural plane of the stent of the present invention;
FIG. 6 is a schematic view of the end cap construction of the present invention;
FIG. 7 is a schematic view of the assembly of the end cap with the bracket and the cell according to the present invention;
FIG. 8 is a schematic view of the end cap back structure of the present invention;
FIG. 9 is a front view of the battery cover according to the present invention;
FIG. 10 is a schematic view of the back side of the battery cover according to the present invention;
FIG. 11 is a schematic view of the battery cover of the present invention converting a certain angle;
FIG. 12 is a schematic view of the electrical conductor structure of the present invention;
FIG. 13 is a schematic diagram of an embodiment of the present invention with anti-overcharge and anti-overdischarge protection;
fig. 14 is a structural view of another embodiment of the electrode holder of the present invention.
Description of reference numerals:
1-battery cover, 2-battery case, 3-bracket, 4-battery core, 5-end cover, 6-protection circuit module, 7-conductive plate, 11-through hole, 12-pole, 13-insulating cap, 14-conductive body, 111-fixing insert, 141-first through hole, 142-second through hole, 143-safety part, 151-first fastener, 152-second fastener, 31-frame, 32-pressing plate, 33-supporting plate, 34-upper connecting sheet, 35-H shaped sheet, 36-connecting sheet, 321-folded edge, 351-bolt, 352-fastening nut, 331-bottom plate through groove, 41-battery core surface, 42-battery core side surface, 43-battery core end surface and 44-tab, 51-longitudinal insulating wall, 52-transverse insulating wall, 53-through groove, 54-serial connection part, 542-base, 541-threaded column, 55-electrode seat, 551-nut component, 552-seat cavity, 553-internal fixation nut, A-parallel connection region, B-serial connection region, 61-MOS pipe component and 71-bolt component.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
It will be understood that when an element is referred to as being "secured to" 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 contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1 to 12, a lithium ion battery includes a battery cell 4, a battery case 2 for accommodating the battery cell 4, and a battery cover 1 covering the battery case 2.
A support 3 for fixing a plurality of battery cores 4 is installed in the battery case 2, the support 3 is in a frame 31 structure, and the side surface of the support 3 is connected with a pressing plate 32 for pressing the side surface 42 of the battery core.
An end cover 5 is erected above the support 3, the end cover 5 is provided with a bus bar area, and the bus bar area comprises a parallel area A for penetrating a plurality of homopolar lugs 44 and a series area B for penetrating a plurality of positive and negative lugs 44; and an insulating wall is arranged at the boundary of the zones.
The battery cover 1 is penetrated by a pole, the battery cover 1 is fixedly connected with the pole, and the lower end of the pole is connected with a conductor 14 used for connecting an electrode seat 55.
A battery cover 1 is covered above the battery case 2, and the battery cell 4 includes a battery cell surface 41, a battery cell side surface 42, and a battery cell end surface 43.
The battery case is characterized in that the bracket 3 is arranged to fix a plurality of battery cells 4 together, and then the battery cells are placed in the battery case 2 together, the bracket 3 keeps a certain distance from the side plate of the battery case 2, so that heat dissipation is facilitated, and meanwhile, the bracket 3 is of a frame 31 structure, so that heat of the battery cells 4 is volatilized in time; set up the side that the pressure strip 32 compressed tightly electric core 4, avoid electric core 4 hollowing, pressure strip 32 and frame 31 spiro union, convenient dismantlement, after electric core 4 placed the frame, install pressure strip 32 on frame 31 again for pressure strip 32 can closely laminate with the side of electric core 4, and the structure is practical, and the scheme is tangible.
The battery cell 4 is arranged by the end cover 5 in a grouping way, the lugs 44 of the battery cells 4 which need to be connected in parallel are arranged in the parallel connection area A, the lugs 44 of the battery cells 4 which need to be connected in series are arranged in the series connection area B, the connection layout of the battery cells 4 is reasonably planned, and meanwhile, the insulation wall is arranged to isolate the positive pole and the negative pole of the battery cells 4, so that the short circuit is avoided.
The utmost point post can integrative injection moulding with battery cover 1, compares the inside scheme of utmost point post fixed in the battery, and the position of utmost point post is stable relatively, is convenient for battery cover 1's installation, need not rectify utmost point post mounted position, has improved battery cover 1's mounting accuracy and assembly efficiency. The electric conductor 14 is arranged on the pole and the electrode seat 55, the length of the electric conductor 14 can be flexibly set as required, the installation position of the pole and the battery cell 4 can be adjusted, and the interval between the pole and the electrode seat 55 can be set to be far away, so that heat dissipation is facilitated. Compared with the welding in the prior art, the electric conductor 14 is respectively in threaded connection with the pole and the electrode base 55, the ductility of the electric conductor is improved, the anti-seismic effect is good, and the joint is not easy to fail.
As shown in fig. 4-5, in the structural embodiment of the bracket 3 of the present invention, an upper tab 34 is disposed on an upper surface of the frame 31 of the bracket 3, and is attached to the end cover 5, and the end cover 5 is provided with a plurality of tab 44 through slots 53 for passing through tabs 44. The lower surface of the frame 31 is provided with a support plate 33, and the support plate 33 is provided with a bottom plate through groove 53331 for reducing weight and dissipating heat. The front and rear end faces of the frame 31 are respectively connected with a transverse H-shaped plate 35, and the H-shaped plate 35 is mounted at the upper end part of the frame 31. The upper surface of the supporting plate 33 is connected with a gasket which is used for being attached to the lower surface of the battery cell 4. The lower end of the frame 31 is provided with an outward extending connecting sheet 36, and the connecting sheet 36 is provided with a connecting hole screwed with the battery case 2.
The pressing plate 32 is a sheet-shaped plate with a folded edge 321, and a plurality of through holes for screwing the frame 31 are formed in the periphery of the folded edge 321. The flange 321 extends to the outside of the outer surface of the frame 31, and the two are fixedly connected by a fastening assembly, which includes a bolt 351 and a fastening nut 352 matched with the bolt. The bolt 351 is longer than the sum of the thickness of the fastening nut 352 and the thickness of the folded edge 321, is fixed on the outer surface of the frame 31, and sequentially penetrates through the through hole of the folded edge 321 and the fastening nut 352, and the fastening nut 352 fastens the pressing plate 32 on the frame 31. Adjacent pressure strip 32 is equipped with the protection pad that is used for laminating mutually with electric core side 42, and the protection pad is located between pressure strip and the electric core side for electric core side can even atress, avoids local atress.
In the embodiment of the end cap 5 structure shown in fig. 6-8, the series connection region B of the end cap 5 includes a positive electrode portion passing through a plurality of positive electrode tabs, and a negative electrode portion passing through a plurality of negative electrode tabs, and a series connection portion 54 is disposed between the positive electrode portion and the negative electrode portion. The series connection area B and the parallel connection area A are respectively provided with a through groove 53 for penetrating the lug 44, the lower end of the caliber of the through groove 53 is wide, the upper end of the caliber of the through groove is narrow, the lug 44 can be conveniently penetrated, and meanwhile, after the lug 44 penetrates through the through groove, the lug 44 can be effectively limited. The number of the through grooves 53 in the series connection area B is 2 times that of the through grooves 53 in the parallel connection area a.
The end cover 5 is made of an insulating sheet material, and the periphery of the end cover is provided with connecting holes for screwing the upper connecting sheets 34. The insulating wall stands upright in the bus area. The insulating walls are arranged transversely and longitudinally along the dividing area and comprise transverse insulating walls 52 arranged transversely and longitudinal insulating walls 51 arranged longitudinally, the transverse insulating walls 52 are arranged in the middle along the end cover 5 and divide the end cover 5 into two parts; the longitudinal insulating walls 51 extend from the lateral insulating walls 52 to the edge of the end cap 5, forming the busbar zone.
The middle position of the transverse insulating wall 52 is provided with a base 542 for mounting a circuit board, and two ends of the transverse insulating wall are provided with electrode holders 55 for connecting tabs. A threaded cylinder 541 for screwing the circuit board is arranged around the base 542; the end of the electrode holder 55 is provided with a nut member 551 for screwing the conductive body 14. The nut member 551 is mounted on the lower surface of the end portion of the electrode holder 55, a through hole is formed in the end portion of the electrode holder 55, and the threaded hole of the nut member 551 coincides with the vertical projection of the through hole.
In the structural embodiment of the battery cover 1 according to the present invention shown in fig. 9-12, the bottom of the pole of the battery cover 1 is provided with a threaded hole, which is connected with a conductive body 14 for connecting with the electrode holder 55, and the conductive body 14 is a sheet structure and made of copper alloy. The pole comprises a positive electrode conductive pole and a negative electrode conductive pole which protrude out of the upper end surface of the battery cover 1.
The vertical projection of the pole is not coincident with the vertical projection of the electrode holder 55, and the vertical projection keep a certain distance, so that the heat dissipation performance of the electrode holder is good. The conductor 14 is arranged along the horizontal direction, and through holes are respectively formed at two ends of the conductor, and the through holes include a first through hole 141 for screwing a pole and a second through hole 142 for screwing the electrode holder 55. The first through hole 141 is provided with a first fastening member 151 from below, and the second through hole 142 is provided with a second fastening member 152 from above. The battery cover 1 is provided with a through hole 11 adjacent to the pole, and the second fastener 152 sequentially penetrates through the through hole 11 and the second through hole 142 to screw the conductor 14 on the electrode holder 55 of the battery core 4. The upper end of the through hole 11 is provided with an insulating cap 13, the lower end of the insulating cap is provided with a fixing insert 111 for screwing the second fastener 152, the fixing insert 111 can be a nut, and the second fastener 152 is a hexagon socket head cap screw with a corresponding type. The electrode holder 55 may be connected to the tabs 44 of a plurality of battery cells 4 at the same time, so as to increase the output power of the battery cells 4, the electrode holder 55 is provided with a coupling nut, and the vertical projections of the second fastening member 152, the second through hole 142 and the coupling nut coincide with each other.
The conductor 14 is provided with a safety part 143 which can be fused when an excessive current flows, the width of the safety part 143 is smaller than that of the main structure of the conductor 14, and the size of the safety part 143 can be determined according to actual requirements. The safety part 143 is arranged on the conductor 14, when the pole and the electrode seat 55 are overloaded for a long time, more heat can be generated, the temperature of the conductor 14 rises, and when the temperature reaches a certain degree, the safety part 143 is fused, so that the connection between the pole and the electrode seat 55 is broken, and the whole circuit is protected.
The invention sets up an anti-overcharge, over-discharge protection embodiment as shown in fig. 13: the electrode holder 55 is connected to a protection circuit module 6 through a conductive plate 7, and the protection circuit module 6 is provided with an MOS tube 61 connected to the conductor 14 to prevent the battery cell from being charged all the time. External power source is connected with utmost point post 12, and the charging circuit that electric current passes through utmost point post 12, electric conductor 14, protection circuit module 6, current conducting plate 7, electrode holder 55, utmost point ear 44 formation in proper order, and then charges electric core 4, and when electric core 4 was fully charged, MOS pipe fitting 61 automatic cutout circuit, charging circuit open circuit prevent that external power source from overcharging electric core 4, damaging electric core 4. The protection circuit module 6 can also be provided with an over-discharge prevention part, when the voltage of the battery core 4 is too low, the over-discharge prevention part is disconnected, the discharge circuit is disconnected, and the external discharge is stopped. The protection circuit module 6 can adopt a precision lithium battery to protect IC-S8211D series circuit chips, and the circuit chips have overcharge and overdischarge protection mechanisms, are mature in technology and convenient to purchase, and can reduce research and development cost and manufacture cost.
Fig. 14 shows an embodiment of an installation structure of an electrode holder and a conductive plate according to the present invention: the electrode seat 55 is provided with a seat cavity 552, an internal fixing nut 553 is arranged in the seat cavity 552, the internal fixing nut 553 is fixedly or movably connected with the seat cavity 552, the conductive plate 7 is placed on the upper surface of the electrode seat 55, the bolt piece 71 sequentially penetrates through the conductive plate 7 and the upper surface of the seat cavity 552 and is screwed in the internal fixing nut 553, and then the conductive plate 7 and the end cover 5 can be firmly connected. The orientation and mounting position of the internal fixing nut 553 may be flexibly set as desired.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A lithium ion battery comprises a battery cell (4), a battery case (2) for accommodating the battery cell (4), and a battery cover (1) covering the battery case (2), and is characterized in that a bracket (3) for fixing a plurality of battery cells (4) is arranged in the battery case (2), the bracket (3) is of a frame (31) structure, and the side surface of the bracket is connected with a compression plate (32) for compressing the side surface of the battery cell (4);
an end cover (5) is erected above the support (3), the end cover (5) is provided with a bus bar area, and the bus bar area comprises a parallel area (A) for penetrating a plurality of homopolar lugs (44) and a series area (B) for penetrating a plurality of positive and negative lugs (44); an insulating wall is arranged at the boundary of the zones;
the battery cover (1) penetrates through the pole (12), the battery cover (1) is fixedly connected with the pole (12), and the lower end of the pole (12) is connected with a conductor (14) used for connecting an electrode seat (55);
the pressing plate (32) is of a sheet structure with a folded edge (321), and a plurality of through holes for screwing the frame (31) are formed in the periphery of the folded edge (321);
the flange (321) extends to the outer side of the outer surface of the frame (31), and the flange and the frame are fixedly connected through a fastening assembly, wherein the fastening assembly comprises a bolt (351) and a fastening nut (352) matched with the bolt.
2. The lithium ion battery of claim 1, wherein the bolt (351) is fixed on the outer surface of the frame (31) and sequentially penetrates through a through hole of the folded edge (321) and a fastening nut, and the fastening nut is used for screwing the pressing plate (32) on the frame (31).
3. The lithium ion battery according to any of claims 1-2, characterized in that the insulating walls are standing in the busbar zone, the insulating walls being arranged laterally and longitudinally along the dividing zone, comprising laterally arranged lateral insulating walls (52) and longitudinally arranged longitudinal insulating walls (51).
4. A lithium ion battery according to claim 3, characterized in that the transverse insulating wall (52) is arranged centrally along the end cap (5), dividing the end cap (5) in two; the longitudinal insulating walls (51) extend from the lateral insulating walls (52) to the edge of the end cap (5) to form the bus bar region.
5. The lithium ion battery of claim 4, characterized in that, the middle of the transverse insulating wall (52) is provided with a base (542) for mounting a circuit board, and the two ends are provided with electrode holders (55) for connecting tabs; the periphery of the base (542) is provided with a threaded cylinder (541) for screwing the circuit board; and the end part of the electrode seat (55) is provided with a mounting hole.
6. The lithium ion battery according to any one of claims 1-2, wherein the conductive body (14) is in the shape of a sheet, and both ends of the conductive body are respectively provided with a through hole, and the through holes comprise a first through hole (141) for screwing the pole (12) and a second through hole (142) for screwing the electrode holder (55).
7. The lithium ion battery according to claim 6, wherein the first through hole (141) is provided with a first fastening member (151) from below, and the second through hole (142) is provided with a second fastening member (152) from above; the battery cover (1) is provided with a through hole (11) adjacent to the pole (12), and the second fastener (152) sequentially penetrates through the through hole (11) and the second through hole (142) to screw the conductor (14) on the electrode seat (55).
8. The lithium ion battery according to claim 7, further comprising a protection circuit module (6) for preventing overcharge, wherein one end of the protection circuit module (6) is connected to the conductor (14) and the other end is connected to the electrode holder (55); the conductor (14) is provided with a fuse part (143) which can be fused when an overlarge current flows, and the width of the fuse part (143) is smaller than that of the conductor main body structure.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711194471.0A CN107895762B (en) | 2017-11-24 | 2017-11-24 | Lithium ion battery |
| PCT/CN2018/117209 WO2019101166A1 (en) | 2017-11-24 | 2018-11-23 | Lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711194471.0A CN107895762B (en) | 2017-11-24 | 2017-11-24 | Lithium ion battery |
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| Publication Number | Publication Date |
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| CN107895762A CN107895762A (en) | 2018-04-10 |
| CN107895762B true CN107895762B (en) | 2020-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711194471.0A Active CN107895762B (en) | 2017-11-24 | 2017-11-24 | Lithium ion battery |
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| CN (1) | CN107895762B (en) |
| WO (1) | WO2019101166A1 (en) |
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| CN107895762B (en) * | 2017-11-24 | 2020-03-03 | 杭州天丰电源股份有限公司 | Lithium ion battery |
| US10680226B2 (en) * | 2018-05-15 | 2020-06-09 | GM Global Technology Operations LLC | Battery assembly having PCBA with cell monitoring and welding assembly features |
| CN108933280B (en) * | 2018-06-22 | 2020-05-05 | 杭州天丰电源股份有限公司 | Lithium ion battery and assembling method thereof |
| CN110400896B (en) * | 2019-08-23 | 2024-07-23 | 湖南携赢动力科技有限公司 | Battery cell serial module support, battery cell serial module and assembly method thereof |
| CN110697251B (en) * | 2019-10-10 | 2024-10-29 | 惠州市恒泰科技股份有限公司 | Lithium battery cell transfer device |
| CN114865245B (en) * | 2019-11-25 | 2024-01-02 | 宁德时代新能源科技股份有限公司 | Battery cell, battery module, battery pack, device using battery cell as power source, and method for assembling battery cell |
| CN111239618B (en) * | 2020-03-09 | 2022-05-10 | 天津市捷威动力工业有限公司 | A kind of module polarity detection method and detection tool |
| CN111816829A (en) * | 2020-07-15 | 2020-10-23 | 卢报新 | A pack structure of a cylindrical lithium battery |
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| CN113540704B (en) * | 2021-07-14 | 2023-06-20 | 东莞新能安科技有限公司 | Battery modules and electrical equipment |
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Also Published As
| Publication number | Publication date |
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| WO2019101166A1 (en) | 2019-05-31 |
| CN107895762A (en) | 2018-04-10 |
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