BACKGROUND
FIELD OF THE INVENTION
The present invention relates to a multi-terminal battery cells where the battery cell consists of plurality of positive and negative terminals. These multi-terminal battery cells are more particularly targeted to prismatic cell designs with wounded type as well as stacked type arrangement of electrodes and separators, mostly applicable to lithium based battery cells which includes lithium-ion, lithium-polymer and solid-state lithium battery cells.
DISCUSSION OF PRIOR ART
All conventional primary and secondary batteries/battery cells consist of one positive and one negative terminal. Battery terminals are the elements through which a battery is charged or discharged. In case of a single battery cell, tabs are welded into the current collector and multiple number of such tabs are welded together to make a positive/negative terminal. On the contrary in a battery, a group of welded tabs from the individual battery cells are in turn welded onto a common bus bar or connector to make a positive/negative terminal.
Multi-terminal battery cells provide various performance benefits as compared to single terminal battery cells. It helps in uniform utilization of active material across the entire surface area of the electrodes thereby resulting in better cycle-life. Multiple tabs can support faster charging and higher discharge capacity due to load sharing between the terminals. It also provides better thermal management by eliminating the need for creation of local hot spots in the current collector tabs.
A number of patents have been reported in state-of-the art on multiple tab arrangement for electrodes and the advantages of using multiple tabs. However most of these inventions are pertaining to lead acid batteries.
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WO 2011/151838 Al titled "A multi-terminal battery plate" by Anil Ananthakrishna discloses multi-terminal battery plates and battery consisting of such plates most particularly for lead-acid, sealed lead-acid and Absorbed Glass Mat (AGM) batteries. The positive and negative plates acting as electrodes consist of multiple numbers of terminals which aid in fast charging, higher discharge capacity and increases the short cracking power. It also provides better thermal performance and higher longevity as a result of load sharing. It is also proposed that the individual plates can be either designed in the form of a pie where multiple plates can be combined to make a circular plate or in the form-of a triangle where multiple plates can be combined to make a square plate. A switching mechanism sequentially selects a group of pies/triangles to withdraw current from such that the other set of pies/triangular plates gets a relaxation time to stabilize the chemical reaction and get ready for charge delivery for the next load requirement.
US 2010/0196752 Al titled "Soft package lithium-ion power battery module" by
Yue.et.al discloses a method of connection of a number of battery modules in series or parallel combination based on the voltage and power requirement for the electrical equipment. U-shaped connectors with low contact resistance are used for electrically connecting the battery modules which can selectively connect a group of battery modules in series or parallel and form the respective positive and negative terminals for that group. The way to connect the batteries in series or parallel arrangement is illustrated where each battery module consists of two positive pole connection terminals and two negative pole connection terminals.
US 6815118B2 titled "Valve regulated lead-acid battery" by Fleming et.al discloses a dual tab design for a flat-plate/prismatic and spirally wounded VRLA (Valve regulated lead-acid battery) with bi-directional current take-off suitable for the operation in electric vehicles (EVs) and hybrid-electric vehicles (HEVs). The proposed design has demonstrated superior performance as compared to batteries with single current take-offs when subjected to HEV load profiles and fast charging and better partial state-of-charge (PSoC) duty required for EVs. The dualcurrent take-offs reduces the internal temperature of the battery by about 30°C and delivers much higher number of cycles prior to charge equalization. Due to elimination of drastic temperature differences, it reduces preferential sulfation at cooler and undercharged regions as well as eliminates the formation of refractory lead or hard lead sulphate at the bottom of the negative plates. The resultant prismatic and spiral-wounded battery with bi-directional current take-offs consists of two positive and two negative terminals.
WO2012/116200A2 titled "Improved battery plate with multiple tabs and mixed pore diameters" by Kelley ef.a/.discloses a way of connecting cells for a VRLA (Valve regulated lead-acid battery) where the positive and the negative terminals arise from the same side of the battery case. The invention consists of cells with opposing tabs, i.e. cells with positive tabs on one side is placed alternate to another cell with negative tabs on the same side and the adjacent cells are interconnected prior to placing inside the battery case. It increases the ease and reduces the cost of manufacturing compared to batteries having positive and negative terminals on opposite sides of the battery pack. This design helps in maintaining uniform electronegativity across the plates and results in increased capacity and better life by reducing sulfation, corrosion and electrolyte stratification within the cell. The invention further uses an open electrode structure like carbon foam consisting of small and large pores. The smaller pores mostly contain the active material whereas the larger pores act as reservoir of electrolyte which keeps proximity with the electrolyte.
EP 2197065 Bl titled "Terminal connection apparatus for battery cells having foil terminals" by Kruger discloses a pressure connection apparatus for the connection of aluminium and copper foil terminals of subsequent battery cells. The apparatus is a kind of conductive spring consisting of two curved end-portions made up of dissimilar metals and two retaining members with curved pockets to house the respective cathode/anode terminal. As emphasised in the invention, a pressure connection method is more desirable for foil terminals than welding due to two significant advantages. Firstly, the connections can be easilyunfastened and individual battery cells can be easily replaced due to the absence of internal fasteners. Secondly, it eliminates galvanic corrosion as welding of dissimilar metals is eliminated.
With respect to the given prior arts the present invention provides multi-terminal battery cells, for wounded and stacked prismatic cells, mostly applicable to lithium based batteries which include lithium-ion, lithium-polymer and solid-state lithium batteries. The battery cells or battery packs consisting of such cells would contain two or more positive and two or more negative terminals each.
SUMMARY OF THE INVENTION
The present invention relates to multi-terminal battery cells for wounded type or stacked type design of prismatic-type of battery cells particularly intended but not limited to lithium-based batteries including lithium-ion, lithium-polymer, lithium-air or solid state lithium batteries.
The present invention also describes a battery/battery pack comprising a bus-bar used for connecting plurality of battery cells. The bus-bar is a thin metal sheet/plate with slots at regular intervals where individual battery cell positive/negative terminals are inserted and then welded or the like to the bus-bar in order to connect all the cells to a single main positive/negative terminal.
In one embodiment of the present invention, the multi-terminal battery cell(s) for a wounded type prismatic cell provided with two or more positive terminals on one side/edge of the battery cell(s) and two or more negative terminals on an opposite side of the battery cell(s).
In another embodiment of the present invention, the multi-terminal battery cell(s) for a wounded type prismatic cell is provided with a first set of positive terminals and a first set of negative terminal are positioned on one side of the cell whereas a second set of positive terminals and a second set of negative terminals are positioned on the opposite side of the cell. Further, the first set of positive
terminals on one side and the second set of negative terminals on the opposite side are in the same line. A battery comprising such battery cells also follows a similar architecture.
A further embodiment of the present invention discloses a mutli-terminal battery cell for a stacked type prismatic cell with plurality of tabs positioned on all the edges. A plurality of positive terminals are positioned on short edges of the battery cell, for example one on each side and a plurality of negative terminals are positioned on long edges of the battery cell, one on each side. The battery consisting of such cells also follow the similar architecture.
BRIEF DESCRIPTION OF THE DRAWINGS ACCOMPANYING THE PROVISIONAL SPECIFICATION:
FigurelA shows a conventional wounded prismatic cell 100 with terminal arrangement, Ti.
FigurelB shows the schematic representation of the various layers inside the wounded prismatic cell 100.
FigurelC shows the front view of a conventional wounded prismatic cell 100 with terminal arrangement, Tx.
FigurelD shows the schematic representation of the side view (cross-section l'-l' of FigurelC) of a conventional wounded prismatic cell 100 with terminal arrangement, Ti.
Figure IE shows the schematic representation of the top view (cross-section 1"-1" of Figure 1C) of a conventional wounded prismatic cell 100 with terminal arrangement, Tj.
Figure 2A shows a wounded type multi-terminal battery cell 200, according to one embodiment of the present invention.
Figure2B shows the schematic representation of the left-hand side view (cross-section 2'-2' of Figure 2C) of the wounded prismatic cell 200 with modified terminal arrangement, T2.
Figure 2C shows the front view of the wounded prismatic cell 200 with modified terminal arrangement, T2.
Figure2D shows the schematic representation of the right-hand side view (cross-section 2"-2" of Figure 2C) of the wounded prismatic cell 200 with modified terminal arrangement, T2.
Figure2E shows the schematic representation of the top view (cross-section 2"'-2"' of Figure 2C) of the wounded prismatic cell 200 with modified terminal arrangement, T2.
Figure 2F shows the battery pack consisting of several wounded prismatic cells 200 with modified terminal arrangement, T2 and the bus-bar connections of the constituent cells.
Figure 2G shows the final battery pack consisting of several wounded prismatic cells 200 with modified terminal arrangement, T2 along with the main battery terminals.
FigureSA shows a wounded prismatic cell 300 with modified terminal arrangement, T3.
Figure 3B shows the schematic representation of the left-hand side view (cross-section 3'-3' of Figure 3C) of the wounded prismatic cell 300 with modified terminal arrangement, T3.
Figure 3C shows the front view of the wounded prismatic cell 300 with modified terminal arrangement, T3.
Figure 3D shows the schematic representation of the right-hand side view (cross-section 3 "-3" of Figure 3C) of the wounded prismatic cell 300 with modified terminal arrangement, T3.
Figure 3E shows the schematic representation of the top view (cross-section 3'"-3'" of Figure 3C) of the wounded prismatic cell 300 with modified terminal arrangement, T3.
Figure 3F shows the battery pack consisting of several wounded prismatic cells 300 with modified terminal arrangement, T3 and the bus-bar connections of the constituent cells.
Figure3G shows the final battery pack consisting of several wounded prismatic cells 300 with modified terminal arrangement, T3 along with the main battery terminals.
Figure 4A shows a stacked prismatic cell 400 with modified terminal arrangement, T4.,according to another embodiment of the present invention.
Figure4B shows the schematic representation of the various layers inside the stacked prismatic cell 400 with modified terminal arrangement, T4.
Figure4C shows the front view of the stacked prismatic cell 400 with modified terminal arrangement, T4.
Figure 4D shows the schematic representation of the side view (cross-section 4'-4' of Figure 4C) of the stacked prismatic cell 400 with modified terminal arrangement, T4.
Figure4E shows the schematic representation of the top view (cross-section 4"-4" of Figure 4C) of the stacked prismatic cell 400 with modified terminal arrangement, T4.
Figure4F shows the battery pack consisting of several stacked prismatic cells 400 with modified terminal arrangement, T4 and the bus-bar connections of the constituent cells.
Figure4G shows the final battery pack consisting of several stacked prismatic cells 400 with modified terminal arrangement, T4 along with the main battery terminals.
Figure 5A shows the schematic representation of the front view of the thin metallic bus-bar used for the connection of the individual cell terminals to form the main battery terminal.
Figure5B shows the schematic representation of the side view of the thin metallic bus-bar used for the connection of the individual cell terminals to form the main battery terminal.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Descriptions of various embodiments of the present invention are made with reference to the accompanying drawings and are shown by way of illustration in which the invention may be practiced. The following description is only for the sake of understanding and is not to limit the present invention. By adding or utilizing other embodiments, structural or dimensional changes are possible without eliminating the scope of present invention.
Figure 1A shows the schematic representation of a conventional wounded type prismatic cell 100 with a positive terminal Ti,+,i and a negative terminal Ti,.,!. A number of positive tabs are spot welded onto the positive current collector foil at regular intervals which are collected together and welded to make the positive terminal Ti,+,i. Similarly, a number of negative tabs are spot welded onto the negative current collector foil at regular intervals which are collected together and welded to make the negative terminal, Ti,.,i.
A desired length of the positive and negative current collector foil is first slit using a slitting machine and coated on both the sides with uniform thickness of positive and negative electrode material respectively. Current collector tabs are then welded onto the respective electrode sheets using point welding, ultrasonic metal welding and the like. Wounded cells are prepared by alternately stacking the coated electrode films over one another, separated by separator films and wounded together manually over a prismatic blade or with the help of a winding machine. The wounded assembly is then placed between two aluminium laminated films, the edges of which are then heat sealed and vacuum sealed to make the final cell. The length of the electrode sheets and the thickness of the coated film depend on the energy and power density desired from each cell, nature of the active material used and the area of the electrode sheet.
Figure IB shows various layers of the section Si of the wounded prismatic cell, 100. Thecathode active materials are 110 pasted onto the positive current collector 120. The anode active material 140 are pasted onto the negative current collector 150. The positive current collector 120 and the negative current collector 150 are separated by the separator film 130.
Figure 1C shows the font view of a conventional wounded prismatic cell, 100 with conventional terminal arrangementTj consisting of a positive terminal Ti,+,i and a negative terminal Ti,.,i.
Figure ID shows the schematic representation of the side view (Section l'-l' in Figure 1C) consisting of a positive terminal Tx, +, i and a negative terminal Ti,., i. Figure IE is the schematic representation of the top view (Section 1"-1" in Figure 1C) of the conventional wounded prismatic cell, 100.
Figure 2A shows a wounded prismatic cell, 200 with modified terminal arrangement, T2. The wounded prismatic cell 200 consists of two positive terminals T2,+,i and T2,+)2 on the same side of the cell and two negative terminals
T2,-,i and T2,-^ on the opposite side of the battery cell 200. The term terminal implies a plurality of tabs connected to form a terminal.
Figure 2B shows the left-hand side view (Section 2'-2' in Figure 2C) consisting of the positive terminal T2,+,i and the negative terminals T2,.,i whereas Figure 2D represents the right-hand side view (Section 2"-2" in Figure 2C) consisting of the positive terminal T2>+j2 and the negative terminals T2,_,2 of the wounded prismatic cell, 200 with modified terminal arrangementT2. Figure 2C represents the font view of the wounded prismatic cell, 200 with modified terminal arrangement, T2 consisting of two positive terminals T2)+)1 and T2,+^ on the same side of the cell and two negative terminals T2,.,i and Tt,.y, present on the opposite side of the cell. Figure 2E shows the schematic representation of the top view (Section 2"'-2'" in Figure 2C) of the prismatic cell, 200 with modified terminal arrangement, T2.
In case of a single cell, the positive terminals T2,+,i and T2;+i2 are welded to a common bus-bar, Bj,* to constitute a single main positive terminal, P2 (not shown). Similarly, the negative terminals T2,_,i and T^ are welded to another bus-bar, B2,. to constitute a single main negative terminal, N2 (not shown).
Figure 2F shows the battery pack consisting of several wounded prismatic cells, 200 with modified terminal arrangement, T2 and the bus-bar connections of the
constituent cells. In this case, the cells' positive terminals, T2,+,i, T2,+^ T2,+,„
are welded to a common bus-bar, B2,+,i whereas the positive terminals, T2)+^,
T2,+,4 T2)+,n+i are welded to another bus-bar, B2,+,2 to constitute two main
positive terminals, P2,i emerging from bus-bar, B2>+>1 and P2>2 emerging from bus­
bar, B2,+,2. Similarly, the cells' negative terminals, T2,.,i, T2,.^ T2,.,„ are
welded to a common bus-bar, B2,.,i whereas the negative terminals, T2,_>2, T2j.,4
T2,.t„+i are welded to a another bus-bar, B2,.,2 to constitute two main
negative terminals, N2,i emerging from bus-bar, B2,.,i and N2,2 emerging from bus­bar, B2,.,2
Figure 2G represents a battery pack consisting of several wounded prismatic cells 200 with modified terminal arrangement, T2 along with the main battery terminals. The final battery pack consists of two main positive terminals P^iand P2,2 on the same side and two main negative terminals N2,i and N2,2 on the opposite side.
Figure 3A shows a wounded prismatic cell, 300 with modified terminal arrangement, T3 consisting of two positive terminals T3,+,i and T3,+,2 and two negative terminals T3,.,i and Ti,-a- Tne first positive terminal, T3,+,i and the first negative terminal, T3(.,i are on the same side of the cell whereas the second positive terminal, T3,+^ and the second negative terminal, T3,.,2 are on the opposite side of the cell. Also, the first positive terminal, T3,+,i on one side faces the second negative terminal on the other side, T3,.^ whereas the first negative terminal, T3,.,i on one side faces the second positive terminal, T3,+^ on the opposite side.
Figure 3C represents the front view of the wounded prismatic cell, 300 with modified terminal arrangement, T3 consisting of two positive terminals T3,+,i and T3,+,2 and two negative terminals,T3,.,! and T^. Figure 3B shows the left-hand side view (Section 3'-3f in Figure 3C) consisting of the positive terminal T^+j, and the negative terminal T3,-,i whereas Figure 3D represents the right-hand side view (Section 3 "-3" in Figure 3C) of the wounded prismatic cell, 300 with modified terminal arrangement, T3 consisting of the positive terminal T3,+,i and the negative terminal T3,_,2. Figure 3E is the schematic representation of the top view (Section 3"'-3'" in Figure 3C) of the wounded prismatic cell, 300 with modified terminal arrangement, T3.
In case of a single cell, the positive terminals T3,+,i and T3)+^ also correspond to two main positive terminals P3,i and P3^ respectively. Similarly, the negative terminals T3,.,i and Tv^ also corresponds to two main negative terminals N3,i and N3,2 respectively. Figure 3F shows the battery pack consisting of several wounded prismatic cells 300 with modified terminal arrangement, T3 and the bus-
bar connections of the constituent cells. In this case, all the cells' positive
terminals on the same side, T3,+,i, T3,+^ T3,+,d are welded to a common bus­
bar, B3,+,i and all the cells' positive terminals on the opposite side, T3,+&
T3,+,4 T3,+,„+i are welded to another bus-bar, B3,+^ resulting in two main
positive terminals, P3,i emerging from bus-bar, B3,+,i and P3,2 emerging from bus­bar, B3,+,2. Similarly, all the cells' negative terminals on the same side- T3oi, T3,.,3
T3,.in are welded to a common bus-bar, 83,.,! and all the cells' negative
terminals on the other side, T3,.^, T3,.,4 T3,.,n+i are welded to another bus­
bar, B3,_,2. Thus, the battery consists of two main negative terminals, N34 emerging
from bus-bar, B3,.,i and N3^ emerging from bus-bar, B3,.,2.
Figure 3G represents a final battery pack consisting of several wounded prismatic cells 300 with modified terminal arrangement, T3 along with the main battery terminals. The final battery packs consists of two main positive terminals P^iand P3)2 and two main negative terminals N34 and N3,2. The first main positive terminal, P3,iand the first main negative terminal, N34 are on the same side whereas the second main positive terminal, P3^ and the second main negative terminal, N32 are on the opposite side. Also, the first main positive terminal, P34 on one side faces the second main negative terminal on the other side,N3,2 whereas the first main negative terminal, N34 on one side faces the second main positive terminal, P3,2 on the opposite side.
Figure 4A shows a stacked prismatic cell, 400 with modified terminal arrangement, T4 consisting of two positive terminals T4,+,i and T4,+,2 on opposite short edges of the cell and two negative terminals T40i and T4,.^ on the opposite long edges of the cell. In this arrangement, tabs are present on all the four edges of the cell; positive tabs on the shorter edges whereas negative tabs on the longer edges.
In the case of a stacked cell arrangement, the positive and negative current collector foil is coated with uniform thickness of positive and negative electrode material respectively on both the sides. The coated electrode sheets are then cut
into desired sizes using a pouch cell die cutter or manually using scissors. Then the current collector tabs are welded onto the respective current collector sheets with the help of point welding, ultrasonic metal welding or the like. The cut-out coated positive and negative electrode films are then alternately stacked over one another, separated by separator films. The number of layers in the stacking assembly and the thickness of the coated film depend on the energy and power density desired from each cell, nature of the active material used and surface area of each layer. Stacking of different layers is done either manually using forceps/tweezers or by using a stacking machine. Finally, the entire stacked assembly is placed between two aluminium laminated films the edges of which are then heat sealed and vacuum sealed to make the final cell.
Figure 4B shows the various layers of the Section S2 of the stacked prismatic cell, 400. The cathode active material 410 is pasted onto the positive current collector 420. The negative active material 440 is pasted onto the negative current collector 450. The positive current collector 420 and the negative current collector 450 are separated by the separator film 430.
Figure 4D represents the front view of the stacked prismatic cell, 400 with modified terminal arrangement, T4 consisting of two positive terminalsT4,+,i andT4,+j2 and two negative terminals T4(.,i and T4,.,2. Figure 4C is the schematic representation of the side view (Section 4'-4' in Figure 4D) showing the two positive terminals T4;+,i and T4,+^ whereas Figure 4E is the schematic representation of the top view (Section 4"-4" in Figure 4C) of the stacked prismatic cell, 400 with modified terminal arrangement, T4 showing the two negative terminals T^i and T4,.^.
In the case of a single cell, the positive terminals T4?+,i and T4,+>2 also corresponds to two main positive terminals P4,i and P4,2 respectively. Similarly, the two negative terminals T4,.,i and T4,_,2 also correspond to two main negative terminals N4,i and N4,2 respectively. Figure 4F shows the battery pack consisting of several stacked prismatic cells 400 with modified terminal arrangement, T4 and the bus-
bar connections of the constituent cells. In this case, all the cells' positive
terminals on the same side, T4,+,i, T4>+3 T4,+,n are welded to a common bus­
bar, B4,+,i and all the cells' positive terminals on the other side, T4,+,2, T4,+>4
T4,+,n+i are welded to another bus-bar, B4,+^ resulting in two main positive terminals, P4;i emerging from bus-bar, B4,+,i and P4a emerging from bus-bar, B4i+,2. Similarly, all the cells' negative terminals on the same side- T4j.,i, T4,_3
T4,.,„ are welded to a common bus-bar, B4,.,i and all the cells' negative
terminals on the other side, T4,.,2, T4,.,4 T4j.,n+1 are welded to another bus­
bar, B^.,2. Thus, the battery consists of two main negative terminals, N4>J emerging
from bus-bar, B4).,i and N4a emerging from bus-bar, B4,.^.
Figure 4G is the schematic representation of the final battery pack consisting of several stacked prismatic cells 400 with modified terminal arrangement, T4 along with the main battery terminals. The final battery pack consists of two main positive terminals P4,iand P4)2 on opposite short edges of the pack and two main negative terminals N4;i and N4,2 on opposite long edges of the pack.
Aluminium and nickel foil are the most commonly used positive current collector film/cathode substrate whereas copper foil is the most widely used anode substrate. Nickel is most commonly used in positive current collector tabs whereas copper is used in negative current collector tabs. The positive active material mostly consists of either of these active materials; LiFeP04, LiMn204, Li(NiCoMn)i/3+T4,+, (b) a plurality of negative terminals T2,., T3,., T4,_ ,(c) a plurality of bus-bars B2+, B3+, B4+, B2-, B3.,and B4.;, said plurality of positive and plurality of negative terminals being selectively connected to the plurality of bus bars, the said battery cell is either a wounded prismatic cell or a stacked prismatic cell.
A multi terminal wounded prismatic cell comprising: a) a plurality of positive terminals T2> +, T3 +T4i +, (b) a plurality of negative terminals T2,-, T3.; T4.,(c) a plurality of bus-bars B2+, B3+) B4+i B2-, B3_, and B4_;, said plurality of positive and plurality of negative terminals being selectively connected to the plurality of bus bars, wherein the plurality of positive and negative terminals are positioned on transverse side, either opposite to each other or one each side.
A multi terminal stacked prismatic cell comprising: a) a plurality of positive terminals T2, +, T3+T4> +, (b) a plurality of negative terminals T2,., T3. T4.,(c) a plurality of bus-bars B2+, B3+, B4+ B2-, B3_t and B4.;, said plurality of positive and plurality of negative terminals being selectively connected to the plurality of bus bars, wherein the plurality of positive and negative terminals are capable of being interchangeably positioned in short and long edges.
The multi-terminal wounded prismatic cell 200 as claimed in claim 2 with a modified terminal arrangementT2comprises (a) one or more positive terminals T2,+,i and T2,+,2; (b) one or more negative terminals T2,-i and T2,.2, one or more bus bars B2,+ and B2,.wherein:
(i) The two positive terminals T2,+,i and T2,+>2 are present on the same side of the cell 200;
(ii) The two negative terminals T2,-i and T2)_2 are present on the opposite sides of the cell 200; and
(iii) The positive terminals T2>+,i and T2,+>2 and the negative terminals T2)_i and T2)_2 are welded into the common bus bars B2(+ and B2,. respectively.
The multi-terminal wounded prismatic cell 200 as claimed in claim 2 with the modified terminal arrangementT2wherein the first positive terminals of all the cells are welded into a single bus bar B2,+iand all the second positive terminals are welded into a second bus bar B2,+ 2.
The multi-terminal wounded prismatic cell 200 as claimed in claim 2 with the modified terminal arrangementT2wherein the first negative terminals of all the cells are welded into a single bus bar B2,_iand all the second negative terminals are welded into a second bus bar B2,.2.
The multi-terminal wounded prismatic cell 300 as claimed in claim 2 with modified terminal arrangementT3comprises (a) one or more positive terminals T3?+jl and T3)+)2, (b) one or more negative terminals T3,.,i and T3>. )2, and (c) one or more bus bars B3)+ and B3,.wherein:
(i) The first positive terminal T3,+?i and the first negative terminal T3,.i are present on one side of the cell 300;
(ii) The second positive terminal T3>+>2 and the second negative terminal T3,.,2 are present on the opposite side of the cell 300;
(iii) The positive terminals on one side are welded into the bus bar B3,+i and the positive terminals on the opposite side are welded into the bus bar B3,+2; and
(iv) The negative terminals on one side of the cell 300 are welded into the bus bar B3,_i and the negative terminals on the opposite side of the cell 300 are welded into the bus bar B3,_2.
The multi-terminal wounded prismatic cell 300 as claimed in claim 1 with modified terminal arrangementT3 wherein the positive terminal T3,+,i faces the second negative terminal on the opposite side T3,.2 and the first negative terminal T3,_i faces the second positive terminal T3,+j, on the opposite side of the cell.
The multi-terminal stacked prismatic cell 400 as claimed in claim 3 with modified terminal arrangement having (a) one or more positive terminals T4,+?i and T4,+>2, (b) one or more negative terminals T4,.,i and T4). >2, (c) a cathode active material 410, (d) a positive current collector 420, (e) a negative active material 440, (f) a negative current collector 450, and (g) a separator film 430, wherein:
(i) The positive terminals T4,+,i and T4,+,2 are present on the short edges of the cell 400, opposite to each other;
(ii) The negative terminals T4,.,i and T^, are present on the long edges of the cell 400, opposite to each other;
(iii) The cathode active material 410 is pasted onto the positive current collector 420;
(iv) The negative active material 440 is pasted onto the negative current collector 450; and
(v) The positive and the negative electrodes are separated by the separator film 430.
10. The multi-terminal stacked prismatic cell 400 as claimed in claim 9 with
modified terminal arrangementT4 wherein the positive terminals T4,+,i are
welded into a common bus bar B4,+i and the positive terminals T4,+^ are
welded into a common bus bar B4,+2.
The multi-terminal stacked prismatic cell 400 as claimed in claim 9 with modified terminal arrangementT4 wherein the negative terminals T4,_,i are welded into a common bus bar 84,-1 and the negative terminals T4,.^ are welded into a common bus bar B4,.2.
A battery/battery pack comprising a bus-bar and a plurality of multi-terminal battery cells, said bus-bar is a thin metal sheet/plate with slots at regular intervals where the individual batter cell with a plurality of positive and negative terminals are inserted.