Traction battery assembly with multi-component busbar module

Abstract

A traction battery assembly with a multi-component busbar module is disclosed. The traction battery includes battery cells stacked in an array and having terminals, and end plates sandwiching the array. The busbar module extends between the end plates and includes slots and busbars arranged alternately along the length of the busbar module. The terminals extend through the slots and connect to the busbars. The busbar module includes a center piece and a pair of end pieces, each formed separately and secured together by connecting features.

Description

Technical Field

[0001] The present disclosure relates to traction battery assemblies for motor vehicles, and more particularly, to traction battery assemblies having multi-component bus bar modules. Background Art

[0002] Vehicles such as battery electric vehicles and hybrid electric vehicles include a traction battery assembly as a source of energy for the vehicle. The traction battery may include components and systems to help manage vehicle performance and operation. The traction battery may also include high-voltage components and may include an air or liquid thermal management system to control battery temperature. Summary of the Invention

[0003] According to one embodiment, a traction battery includes battery cells stacked in an array and having terminals, and end plates sandwiching the array. A bus bar module extends between the end plates and includes slots and bus bars arranged alternately along the length of the bus bar module. The terminals extend through the slots and connect to the bus bars. The bus bar module includes a center piece and a pair of end pieces formed separately and secured together by connecting features.

[0004] According to one embodiment of the present invention, the busbar module further includes output terminals and output terminal busbars electrically connecting the output terminals to the array.

[0005] According to one embodiment of the present invention, the traction battery further comprises a plurality of cooling fins and a cold plate, wherein the plurality of cooling fins are arranged alternately with the battery cells, and the cold plate supports the array and contacts the cooling fins.

[0006] According to another embodiment, a traction battery includes a battery cell array having a pair of opposing terminal sides from which terminals of each battery cell extend. End plates sandwich the array. A pair of bus bar modules are each disposed on one of the terminal sides and extend between the end plates. Each bus bar module includes a center member and a pair of end members that are formed separately and secured together by connecting features.

[0007] According to an embodiment of the present invention, each of the bus bar modules further includes a plurality of bus bars provided on an outer main side of the bus bar module, and each of the terminals is connected to one of the bus bars.

[0008] According to one embodiment of the present invention, each of the bus bar modules further includes a slot and each of the terminals extends through one of the slots.

[0009] According to yet another embodiment, a traction battery includes battery cells stacked in an array, each having a terminal extending from a terminal side of the array. End plates sandwich the array. A busbar module includes a frame comprising a centerpiece and a pair of end pieces, and busbars supported on the frame, the centerpiece and the pair of end pieces being interconnected by connection features. The frame is positioned on the terminal side such that the terminals extend through the frame to connect to the busbars.

[0010] According to one embodiment of the present invention, the battery cell is a pouch-shaped battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of an example of a hybrid vehicle.

[0012] Figure 2 It is a three-dimensional diagram of the traction battery assembly.

[0013] Figure 3 This is a three-dimensional diagram of a battery unit.

[0014] Figure 4 is a perspective view of cooling fins mounted to a battery cell frame.

[0015] Figure 5 A perspective view of the battery cell array of a traction battery.

[0016] Figure 6 is a front perspective view of a bus bar module for a traction battery having connection features according to one embodiment.

[0017] Figure 7 yes Figure 6 Rear perspective view of the central busbar module.

[0018] Figure 8 is a top view of a connection feature according to another embodiment.

[0019] Figure 9 It is a perspective view of another traction battery.

[0020] Figure 10 yes Figure 9 Partial top cross-sectional view of a busbar module of a traction battery. DETAILED DESCRIPTION

[0021] Embodiments of the present disclosure are described herein. However, it should be understood that the disclosed embodiments are merely examples, and that other embodiments may take various alternative forms. The figures need not be drawn to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, the specific structural and functional details disclosed herein should not be interpreted as limiting, but merely as a representative basis for teaching those skilled in the art to utilize the invention in various forms. As will be understood by those of ordinary skill in the art, the various features shown and described with reference to any of the figures may be combined with features shown in one or more other figures to produce embodiments that are not explicitly shown or described. The combinations of features shown provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present disclosure may be desired for specific applications or implementations.

[0022] Figure 1 A schematic diagram of a typical plug-in hybrid electric vehicle (PHEV) is depicted. However, certain embodiments may also be implemented in the context of non-plug-in hybrid and all-electric vehicles. Vehicle 12 may include one or more electric machines 14 that are mechanically connected to a hybrid transmission 16. Electric machine 14 is capable of operating as a motor or a generator. In addition, hybrid transmission 16 may be mechanically connected to engine 18. Hybrid transmission 16 may also be mechanically connected to a drive shaft 20 that is mechanically connected to wheels 22. Electric machine 14 may provide propulsion and deceleration capabilities when engine 18 is turned on or off. Electric machine 14 also acts as a generator and provides fuel economy benefits by recovering energy in regenerative braking. Electric machine 14 reduces polluting emissions and increases fuel economy by reducing the workload of engine 18.

[0023] The traction battery or battery pack 24 stores energy that can be used by the electric machine 14. The traction battery 24 typically provides a high voltage direct current (DC) output through one or more battery cell arrays (sometimes referred to as battery cell stacks) within the traction battery 24. A battery cell array includes one or more battery cells.

[0024] A battery cell, such as a prismatic, pouch, cylindrical, or any other type of battery cell, converts stored chemical energy into electrical energy. A battery cell may include a housing, a positive electrode (cathode), and a negative electrode (anode). An electrolyte allows ions to move between the anode and cathode during discharge and then back during recharge. Terminals allow current to flow out of the battery cell for use by a vehicle.

[0025] Different battery pack configurations can be used to address individual vehicle variables, including packaging constraints and power requirements. Battery cells can be thermally regulated using a thermal management system. Examples of thermal management systems include air cooling, liquid cooling, and a combination of air and liquid cooling.

[0026] The traction battery 24 can be electrically connected to one or more power electronics modules 26 via one or more contactors (not shown). The one or more contactors isolate the traction battery 24 from other components when open and connect the traction battery 24 to the other components when closed. The power electronics module 26 can be electrically connected to the electric motor 14 and can provide the ability to transfer electrical energy bidirectionally between the traction battery 24 and the electric motor 14. For example, a typical traction battery 24 can provide a DC voltage, while the electric motor 14 may require a three-phase alternating current (AC) voltage to operate. The power electronics module 26 can convert the DC voltage into the three-phase AC voltage required by the electric motor 14. In regenerative mode, the power electronics module 26 can convert the three-phase AC voltage from the electric motor 14, which acts as a generator, into the DC voltage required by the traction battery 24. The description herein also applies to all-electric vehicles. In all-electric vehicles, the hybrid transmission 16 may be a gearbox connected to the electric motor 14, and the engine 18 is not present.

[0027] In addition to providing energy for propulsion, traction battery 24 can also provide energy for other vehicle electrical systems. A typical system may include a DC / DC converter module 28 that converts the high-voltage DC output of traction battery 24 into a low-voltage DC supply compatible with other vehicle components. Other high-voltage loads, such as compressors and electric heaters, can be connected directly to the high-voltage supply without using DC / DC converter module 28. In a typical vehicle, low-voltage systems are electrically connected to an auxiliary battery 30 (e.g., a 12-volt battery).

[0028] A battery energy control module (BECM) 33 can communicate with the traction battery 24. The BECM 33 can act as a controller for the traction battery 24 and can also include an electronic monitoring system that manages the temperature and state of charge of each of the battery cells. The traction battery 24 can have a temperature sensor 31, such as a thermistor or other thermometer. The temperature sensor 31 can communicate with the BECM 33 to provide temperature data regarding the traction battery 24.

[0029] The vehicle 12 can be recharged at a charging station connected to an external power source 36. The external power source 36 can be electrically connected to an electric vehicle supply equipment (EVSE) 38. The external power source 36 can provide DC or AC power to the EVSE 38. The EVSE 38 can have a charging connector 40 for plugging into a charging port 34 of the vehicle 12. The charging port 34 can be any type of port configured to transfer power from the EVSE 38 to the vehicle 12. The charging port 34 can be electrically connected to a charger or an onboard power conversion module 32. The power conversion module 32 can condition the power supplied by the EVSE 38 to provide the appropriate voltage and current levels to the traction battery 24. The power conversion module 32 can interact with the EVSE 38 to coordinate the transfer of power to the vehicle 12. The EVSE connector 40 can have pins that mate with corresponding sockets of the charging port 34.

[0030] The various components discussed may have one or more associated controllers to control and monitor the operation of the components.The controllers may communicate via a serial bus (eg, a controller area network (CAN)) or via dedicated electrical lines.

[0031] Figures 2 to 10 and related text describe examples of traction batteries 24. Figures 2 to 5 The traction battery assembly 50 includes a plurality of battery cells 54 stacked in a battery cell array 52. ​​Each of the battery cells 54 may have opposing primary sides 56. In the illustrated embodiment, the battery cells are pouch-shaped battery cells. Terminals 60 extend from the secondary sides 58. Each battery cell 54 may have two terminals 60, for example, a positive terminal and a negative terminal, with the positive and negative terminals extending from different secondary sides 58. Each battery cell 54 may have an associated frame 62 and associated cooling fins 64. The cooling fins 64 are arranged alternately with the battery cells 54 such that each cooling fin 64 is positioned against the primary sides 56 of an adjacent pair of battery cells 54. The frames 62 support the battery cells 54 in the array 52 and the cooling fins 64. Each frame 62 may define a receptacle 66 for receiving the associated battery cell 54. Each frame 62 may also include a pair of terminal openings 68 on the left and right sides to allow the terminals 60 to extend through the frame 62. The array 52 may be formed by first packaging the battery cells, fins, and frames into battery cell assemblies 69, and then stacking the desired number of battery cell assemblies 69 into the array 52. ​​The array 52 may be held together by a pair of end plates 70, 72 and rods (not shown) extending through the frame 62. Each end plate 70, 72 is adjacent to the major side 56 of the first or last battery cell.

[0032] Traction battery 50 may include one or more of the battery cell arrays 52 described above, depending on power requirements, packaging constraints, the vehicle's electric range, and other factors. One or more battery cell arrays 52 are assembled on a substrate, such as a cold plate 74. Fins 64 contact cold plate 74 to transfer thermal energy between battery cells 54 and cold plate 74. Cold plate 74 is part of a thermal management system that is configured to circulate a coolant through the internal structure of cold plate 74 to heat or cool battery cells 54 as needed.

[0033] The battery cell array 52 includes at least one terminal side (i.e., the side from which the terminals extend). In the illustrated embodiment, the battery cell array 52 has a pair of opposing terminal sides 76, 78. The battery cells 54 in each array 52 can be wired in series, in parallel, or in a combination thereof. The illustrated battery cell array 52 is shown in series, with the terminals 60 on each terminal side 76, 78 alternating between positive and negative polarity along the length of the array 52. ​​Adjacent positive and negative terminals are selected for connection to one another.

[0034] Reference Figure 2 、 Figure 6 and Figure 7 , bus bar modules 86 can be used to electrically connect select terminals 60. Battery cell array 52 can include a first bus bar module 86 positioned against terminal side 76 and a second bus bar module 88 positioned against terminal side 78. Bus bar module 86 includes a frame 90 extending between opposing end plates 70, 72. Frame 90 can be a planar body having an inner surface 92 facing terminal side 76, an outer surface 94, and edges 96 extending generally perpendicular to surfaces 92, 94. Frame 90 can define a plurality of slots 98 distributed along the length of frame 90. Slots 98 can extend in a direction perpendicular to the length of frame 90. Frame 90 defines a plurality of bus bar support posts 100 arranged alternately with slots 98. Each of posts 100 supports a bus bar 106. Each of posts 100 can define a receptacle 102 configured to receive one of bus bars 106 and a peg 104 extending from a lower end of post 100. Each of the bus bars 106 is received in a corresponding receiving portion 102 and defines a hole for receiving one of the posts 104. The head of the post 104 can be deformed by heat stacking or cold working to secure the bus bar 106 to the column 100. The upper end of the bus bar 106 can extend through the hole 107 to electrically contact the circuit board disposed on the inner surface 92 of the bus bar module 86.

[0035] The terminals 60 extend through the slots 98 and are folded over a corresponding one of the bus bars 106. The array 52 can be arranged so that one positive terminal and one negative terminal extend through each of the slots 98. The inner surface 92 can define guides 109 that guide the terminals 60 into the desired slots 98 when the bus bar module 86 is installed on the array 52. ​​These positive and negative terminals are then attached to corresponding ones of the bus bars 106 and to each other by laser welding or other methods known in the art. The second bus bar module 88 may also include the above-described structure.

[0036] The first busbar module 86 may also include a positive output terminal 108 and a negative output terminal 110. These terminals may be electrically connected to other arrays of the traction battery assembly 50 or may be output terminals of the traction battery 50. A negative output terminal busbar 114 electrically connects the negative terminal 110 to the array 52. ​​Busbar 114 includes a narrow portion 116 connected to the first post 118 and a wider portion 120 secured to the negative terminal 110. The negative terminal 121 of the first battery cell is electrically connected to the narrow portion 116. The wider portion 120 may define a hole that receives the terminal 110 therethrough. A positive output terminal busbar 112 electrically connects the positive terminal 108 to the array 52. ​​Busbar 112 includes a narrow portion 122 connected to the last post 124 and a wider portion 126 secured to the positive terminal 108. The positive terminal 123 of the last battery cell is electrically connected to the narrow portion 122. The wider portion 126 may define a hole that receives the terminal 108 therethrough.

[0037] As described above, the traction battery assembly 50 may include multiple battery cell arrays 52. In many instances, packaging constraints dictate that the number of battery cells 54 in each array 52 differ. For example, the traction battery 50 may include three arrays, two of which have 24 battery cells and one of which has 32 battery cells. The battery cell assemblies 69 may be modular, so that each array is substantially identical except for the number of battery cell assemblies stacked together. By making the battery cell assemblies 69 modular, tooling costs can be reduced. Tooling costs can be further reduced by making other components of the battery 50 modular, such as the bus bar modules 86 and 88. The length of the bus bar modules 86 depends on the number of battery cells 54 in the array. Therefore, a bus bar module for a 32-cell array will necessarily be longer than a bus bar module for a 24-cell array. If the frame 90 is formed as a single piece, each frame will only be suitable for arrays with a specific number of battery cells. On the other hand, if the frame 90 is formed from multiple modular components, at least some of the multiple modular components can be used on arrays with different lengths.

[0038] Reference Figure 6In the illustrated embodiment, the first bus bar module 86 is constructed using a pair of end members 130, 131 and a center member 132 interconnected by a connecting feature 134. Adjacent members can be interconnected by a pair of connecting features, one of which is located near the top and the other is located near the bottom. Of course, the number of connecting features can be increased or decreased, and the location can be changed according to specific design needs. The end members 130, 131 are modular and can be used for arrays of different lengths. The center member 132 may not be modular because it may only be suitable for arrays of a specific length.

[0039] The three-piece frame described above not only reduces the number of required connection features 134, but also reduces the modularity of centerpiece 132. Instead of having a single centerpiece, frame 90 can include multiple centerpieces of a specific length. For example, each centerpiece can span four battery cells. The array can then be designed to have a length four times the length of the battery cells. In this embodiment, the centerpieces can be modular. In other embodiments, the frame can be designed with multiple centerpieces, some of which are modular and some of which are dedicated to a specific array length.

[0040] Each connecting feature 134 may include a protrusion formed on one of the adjacent components and a receiver formed on the other of the adjacent components. For example, connecting feature 134A may include a protrusion 136 extending from the inner edge 140 of the end component 130 and a receiver 138 recessed into the first edge 142 of the center component 132. The protrusion 136 may include a neck 150 extending from the edge 140 and a head 146 disposed at the end of the neck. The head 146 may include a pair of hooks 148 extending generally perpendicular to the neck 150. The receiver 138 is shaped generally to match the protrusion 136 and includes a pair of abutments 152 configured to engage with the hooks 148 to secure the protrusion 136 within the receiver 138. Another connecting feature 134B may be located at a lower portion of the frame 90. Connecting features 134A and 134B cooperate to secure the inner edge 140 of the end piece 130 against the first edge 142 of the center piece 132. The inner edge 141 of the end piece 131 can be secured to the second edge 144 of the center piece 132 by connecting features 134C and 134D. These connecting features can also include a protrusion 154 that is received in a receiver 156. The protrusion 154 and receiver 156 can be similar to the protrusion and receiver described with reference to connecting features 134A and 134B. The connecting feature 134 shown can be referred to as a dovetail connection. Other embodiments can utilize other types of connections.

[0041] Figure 8Another type of connecting feature that can be used to secure frame members together is shown. Connecting feature 160 can be used to connect a first frame member 162 (e.g., an end member) to a second frame member 164 (e.g., a center member). Connecting feature 160 includes a protrusion 165 having a base 166 disposed on an outer surface 168 of first member 162. A neck 170 extends from base 166 toward second member 164. A head 172 is formed at the distal end of neck 170 and includes a hook 174. Second frame member 164 has a ring 176 configured to receive a portion of protrusion 165 therein. Ring 176 is disposed on an outer surface 178 of second member 164 and cooperates with outer surface 178 to define an opening configured to receive protrusion 165. Ring 176 defines an abutment 180 configured to engage with hook 174 to prevent disengagement of head 172 from ring 176. In other embodiments, buckles, fasteners, adhesives, etc. may be used to connect the first and second frame members together.

[0042] Reference Figure 9 and Figure 10 Another traction battery assembly 200 includes a battery cell array 202 having a plurality of stacked battery cells (not shown). The battery cell array 202 may be similar to the battery cell arrays previously described and may have a pair of end plates 204 and a pair of bus bar modules 206 extending between the end plates. Terminals 208 of the battery cells may extend from the terminal side of the array and extend through slots defined in the bus bar modules 206.

[0043] The battery cells can be connected in series and in parallel. In the illustrated embodiment, a pair of adjacent battery cells are connected in parallel, and the pair of battery cells are connected in series with an adjacent pair of parallel-connected battery cells. Busbars 210 electrically connect the battery cells of the array 202. Busbar 210A can be used to connect the first four battery cells of the array. Busbar 210A may include vertical portions 212 (mostly obscured by the battery cell terminals) and horizontal portions 214 interconnected with the vertical portions 212. Each vertical portion 212 is attached to a terminal 208. For example, the negative terminals of the first and second battery cells are laser welded to the first and second vertical portions, and the positive terminals of the third and fourth battery cells are laser welded to the third and fourth vertical portions. Additional busbars (e.g., 210B) are interconnected with blocks of the other four battery cells.

[0044] The bus bar 210 is supported on a frame 216 of the bus bar module 206. The frame 216 defines stakes 218 that extend outwardly from an outer surface of the module 206. The bus bar 210 defines corresponding holes 220 that allow the bus bar 210 to be placed on the module 206, with the stakes 218 extending through the holes 220. The heads of the stakes 218 can be deformed by shrink fitting or cold working to secure the bus bar to the frame 216.

[0045] The frame 216 can be composed of multiple components and include at least one end component 224 and a center component 226. The end components 224 and the center component 226 can be connected together by busbars 210A, rather than utilizing the protrusions and receivers described above. The horizontal portion 214 of the busbar 210 can span the interface between the end components 224 and the center component 226. The horizontal portion 214 is connected to both the end components 224 and the center component 226 by one or more of the pegs 218. Thus, the busbars 210 serve as a connecting feature to secure the components of the frame 216 together.

[0046] Although exemplary embodiments have been described above, these embodiments are not intended to describe all possible forms encompassed by the claims. The words used in the specification are descriptive rather than restrictive, and it should be understood that various changes may be made without departing from the spirit and scope of the present disclosure. As previously mentioned, the features of the various embodiments may be combined to form further embodiments of the present invention that may not be explicitly described or shown. Although the various embodiments may have been described as providing advantages or being superior to other embodiments or prior art embodiments in one or more desired characteristics, it will be appreciated by those skilled in the art that, depending on the specific application and implementation, one or more features or characteristics may be compromised to achieve the desired overall system properties. These properties may include, but are not limited to, cost, strength, durability, life cycle cost, marketability, appearance, packaging, size, maintainability, weight, manufacturability, ease of assembly, and the like. Therefore, embodiments described as being inferior to other embodiments or prior art embodiments in one or more characteristics are not outside the scope of the present disclosure and may be expected to be used in specific applications.

Claims

1. A traction battery comprising: battery cells stacked in an array and each battery cell having a terminal; a pair of end plates that sandwich the array; a bus bar module extending between the pair of end plates and including slots and bus bars alternately arranged along a length of the bus bar module, wherein the terminals extend through the slots and connect to the bus bars, and the bus bar module includes a center piece and a pair of end pieces formed separately and secured together by connecting features, wherein each end member is connected to one of the pair of end plates, and the center member is located between the pair of end members in the length direction and is connected to the pair of end members by the connection features, wherein each of the connection features includes a protrusion attached to one of the end piece and the center piece and a receiver attached to the other of the end piece and the center piece, and the protrusion is disposed in the receiver to interlock the end piece and the center piece.

2. The traction battery according to claim 1, wherein: The terminals include positive and negative terminals extending from a pair of opposite terminal sides of the battery cell, respectively, and the array is arranged such that one positive terminal and one negative terminal extend through each slot.

3. The traction battery according to claim 1, wherein: The protrusion includes a hook portion, and the receiving portion defines an abutment portion engageable with the hook portion.

4. The traction battery according to claim 1, wherein: The bus bar module further includes at least four connecting features, each of the end pieces being connected to the center piece via two of the at least four connecting features.

5. The traction battery according to claim 1, wherein: The bus bar module defines stakes extending through holes in the bus bar to secure the bus bar to the bus bar module.

6. The traction battery according to claim 1, wherein: The bus bar module defines an outer surface and an inner surface disposed against the array, and the bus bar is disposed on the outer surface.

7. The traction battery of claim 1 , further comprising another bus bar module disposed on a side of the array opposite the bus bar module, extending between the pair of end plates, and comprising slots and bus bars alternately arranged along a length of the other bus bar module, wherein: The terminals extend through the slots and connect to the busbars of the other busbar module, and the other busbar module includes a center piece and a pair of end pieces that are separately formed and secured together by connecting features.

8. A traction battery comprising: a battery cell array including a pair of opposed terminal sides, a terminal of each battery cell extending from the pair of opposed terminal sides; a pair of end plates sandwiching the battery cell array; a pair of bus bar modules, each bus bar module being disposed on one of the pair of opposed terminal sides and extending between the pair of end plates, each bus bar module comprising a center member and a pair of end members formed separately and secured together by connecting features, wherein each end member is connected to one of the pair of end plates, and the center member is located between the pair of end members in the length direction of the busbar module and is connected to the pair of end members by the connection features, wherein at least one of the pair of bus bar modules further includes a bus bar spanning one of the pair of end members and the center member, and the bus bar is attached to the one of the pair of end members and the center member by stakes extending through holes defined in the bus bar.

9. The traction battery according to claim 8, wherein: Each connection feature includes a protrusion attached to one of the end piece and the center piece and a receiver attached to the other of the end piece and the center piece, the protrusion being receivable within the receiver and configured to interlock with the receiver.

10. The traction battery of claim 9, wherein: The protrusion includes a hook portion and the receiving portion defines an abutment that engages the hook portion.

11. The traction battery of claim 8, wherein: Each of the pair of bus bar modules is a planar body having opposing major sides and edges extending between the major sides, and wherein a first edge of the center piece is positioned against an edge of one of the pair of end pieces and a second edge of the center piece is positioned against an edge of the other of the pair of end pieces.

12. The traction battery of claim 8, wherein: Each bus bar module further defines a slot, and the terminals include a positive terminal and a negative terminal, the battery cell array being arranged such that one positive terminal and one negative terminal extend through each slot.

13. A traction battery comprising: battery cells stacked in an array and each battery cell having a terminal extending from a terminal side of the array; a pair of end plates that sandwich the array; A bus bar module comprising a frame composed of a center piece and a pair of end pieces, the center piece and the pair of end pieces being separately formed and interconnected by connection features, and a bus bar supported on the frame, the frame being provided on a terminal side so that the terminals extend through the frame to connect to the bus bar, wherein each end member is connected to one of the pair of end plates, and the center member is located between the pair of end members in the length direction of the busbar module and is connected to the pair of end members by the connection features, wherein each connection feature includes a protrusion attached to one of the end piece and the center piece and a receiver attached to the other of the end piece and the center piece, and the protrusion is receivable in the receiver and is configured to interlock with the receiver.

14. The traction battery of claim 13, wherein: The bus bar module defines slots, and the terminals include positive and negative terminals, the array being arranged such that one positive and one negative terminal extend through each slot.

15. The traction battery of claim 13, wherein: The protrusion includes a hook portion and the receiving portion defines an abutment engageable with the hook portion.

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