Collector plate, collector assembly and battery pack

Abstract

A busbar applied to a battery module comprising a plurality of cell groups, the busbar comprising: a plurality of busbar subplates arranged side by side, each configured to collect operating signals from the plurality of cell groups; a flexible conductive connecting plate provided between each pair of adjacent busbar subplates, the two ends of the connecting plate being connected to the two adjacent busbar subplates, the connecting plate being provided with a first bending structure, the first bending structure being configured to deform when the two cell groups move away from or towards each other.

Description

FIELD OF APPLICATIONThe application relates to the field of battery technology, specifically to a collector plate, a collector assembly, and a battery pack.PRIOR ARTIn related technologies, the battery pack includes a case, a battery module disposed in the case, and a battery management system (BMS) board, and a collection assembly electrically connecting the battery module to the BMS board. The cell contact system (CCS) is composed of a bus bar electrically connected to the battery cell of the battery module and a collector plate electrically connected to the bus bar and the cell. The collector plate generally uses a flexible printed circuit board (FPC board for short). The collector plate is used to transmit the temperature signal and the voltage signal of the cell to the BMS board sequentially via the wire harness and the connector.When the battery module includes a plurality of cell groups, a single collector plate is typically used to collect the temperature and voltage signals of a plurality of cell groups to reduce the number of electrical components and reduce the difficulty of wiring. During use of the battery module, the battery cell expands due to the temperature increase, thereby generating a tensile force on the collector plate welded to the battery cell, thereby dropping the solder joint between the collector plate and the cell, and even cracking the collector plate, which reduces the reliability of the collection result.DISCLOSURE OF THE APPLICATIONThe application provides a collector plate, a collector assembly, and a battery pack to solve the above-mentioned technical problems.According to a first aspect, an embodiment of the present application provides a collector plate applied to a battery module including a plurality of cell groups. The collector plate includes a collector sub-plate and a flexible conductive connection plate. The collection sub-plate is provided in a plurality, and the plurality of collection sub-plates are arranged side by side and each configured to collect working signals of the plurality of cell groups; the connection plate is provided between each two adjacent collection sub-plates, the two ends of the connection plate are connected to the two adjacent collection sub-plates, the connection plate is provided with a first bending structure, and the first bending structure is configured to deform as the two cell groups move away from or towards each other.In accordance with a second aspect, an embodiment of the present application provides a collection assembly. It includes a bus bar, a bus bar group, and the above bus bar; the bus bar group is provided in a plurality, and the plurality of bus bar groups are arranged side by side on the bus bar and are each formed to be connected to the plurality of cell groups; the plurality of bus bar sub-sheets are each connected to the plurality of bus bar groups, and the connection sheet is located between each two adjacent bus bar groups.According to a third aspect, an embodiment of the present application provides a battery pack. It comprises a battery box, a battery module, a BMS board and the above collecting arrangement. The battery box has a first accommodation cavity and a second accommodation cavity distributed in the longitudinal direction; the battery module is disposed in the first accommodation cavity and includes a plurality of cell groups along the longitudinal direction; the BMS board is disposed in the second accommodation cavity; the collection assembly is disposed in the first accommodation cavity; wherein the plurality of bus bar groups are respectively connected to the plurality of cell groups, and the first signal output end of the output header of the plurality of header plates is connected to the BMS board.Advantageous Effects:The present application achieves the following advantageous effects:In the collector plate provided in the application, by disposing a first bending structure on the part where the collector plate is located between the two cell groups, the collector plate has a buffer part formed based on the first bending structure, so that when the cell group generates thermal expansion, the buffer part may generate deformation to buffer the stress of expansion between the cell groups on the collector plate to improve the stability of the welding part between the collector plate and the cell and prevent cracking of the collector plate and finally improve the reliability of the collector plate.The collecting assembly provided in the present application adopts the above-mentioned collector plate. When the cell group generates thermal expansion, the first bending structure may be used to generate deformation to buffer the expansion between the cell groups against the drawing of the collector plate to improve the stability of the welded part between the collector plate and the cell, and may prevent the collector plate from being torn, and finally, the reliability of the collector assembly may be improved.The battery pack provided in the present application adopts the above-mentioned collecting arrangement. When the cell pack generates thermal expansion, the first bending structure may be used to generate deformation to buffer the expansion between the cell groups against the drawing of the collector plate, to improve the stability of the welded part between the collector plate and the cell, and to avoid tearing of the collector plate, and ultimately to improve the reliability of the battery pack.Presentation of the ApplicationFIG. 1 is a schematic diagram showing the structure of the collector plate provided in the embodiment of the present application; FIG. 2 is a side view of the collector plate provided by the embodiment of the present application; FIG. 3 is an enlarged view of the position A in FIG. 1. FIG. 4 is a schematic diagram showing the structure of the collection assembly provided in the embodiment of the present application; FIG. 5 shows an enlarged illustration of the location B according to FIG. 4 ; FIG. 6 shows an enlarged illustration of the location C according to FIG. 4 ; FIG. 7 shows an enlarged illustration of the location D according to FIG. 4 ; FIG. 8 is a schematic diagram showing the structure of the battery pack provided in the embodiment of the present application; FIG. 9 is a schematic diagram of the wiring between the battery charging and discharging interface of the battery pack and the BDU provided in the embodiment of the present application; FIG. 10 is a schematic diagram of the circuit diagram of the bus harness of the battery pack provided in the embodiment of the present application.Description of the Reference Numerals:001. 011 Collection arrangement. 111 is a collector plate. Collecting sub-plates; 1111. first signal output terminal; 1112. second bending structure; 1113. Voltage Accumulation Region; 1114. Collecting notch; 1115. Collecting end plate; 11151. Buffer Notch; 1116. Gap; 1117. Connecting strip 11171. Cutting notches; 112. Connecting plate; 1121. first bending structure; 11211. first surface; 113. Bending end plates; 012. Collecting carrier; 121. Groove; 013. Bus bar group; 131. Bus bar; 132. conductive sheet; 002. Battery box; 021, first receiving cavity; 022, second receiving cavity; 023. Cross beam; 024. Longitudinal beams; 025. Final separator; 031. Plus electrode of BDU; 032. Minus Electrode of BDU; 041. Charging Plus Electrode Row; 042. Discharge Minus Electrode Row; 043. Charge-Discharge-Minus-Electrode Row; 051. Charging interface; 052. Interface for Emptying; 061. BMS motherboard; 062. BMS slave board; 063. Connectors; 071. Fast Load Interface; 072. Communication interfaces; 008. Battery module; 081. Cell groupEmbodiments of the ApplicationIn the present application, the terms "connected to each other", "connecting", "fastening" or the like are intended to be understood in the broader sense unless expressly stated otherwise. Thus, for example, this can be a fixed, a releasable or a one-piece connection as well as a mechanical and also an electrical connection. In addition, direct connections, indirect connections or connections produced via an intermediate piece, as well as internal connections of two elements or interactions of two elements are also conceivable. One of ordinary skill in the art can be based on the subject to determine what meaning the terms mentioned according to the present application are intended to have.In the present application, a first feature disposed "above" or "below" a second feature may be, unless expressly stated and defined otherwise, the case that the first feature directly contacts the second feature or that the first and second features contact without direct contact via another feature disposed therebetween. Moreover, in the case of the first feature, which is arranged "on", "above" the second feature and "above" the second feature, it may be the case, inter alia, that the first feature lies directly above and obliquely above the second feature, or that the horizontal height position of the first feature is higher than that of the second feature. In the case of the first feature, which is arranged "under" the second feature and "below" the second feature, it may be the case, inter alia, that the first feature lies directly under and obliquely under the second feature, or that the horizontal height position of the first feature lies lower than that of the second feature.In the description of the present embodiment, the terms "upper", "lower", "left", "right", etc. are used with reference to the illustrated orientation or positional relationship in each figure to describe only the operation and simplify the description as appropriate. In other words, these terms are used to indicate neither in-depth nor explicitly the positioning and the configuration and operation of the relevant device or of the relevant element in a predetermined positioning, and therefore there is also no restriction of the application here. Moreover, the terms "first" and "second" having no particular meaning are used only to achieve distinction in the description.In order to solve the problem that the collector plate is pulled by the heating and expansion of the cell, the braze between the collector plate and the cell drops, and even the collector plate is torn to reduce the reliability of the collection amount, the embodiment of the present application provides a collector plate, a collection assembly, and a battery pack. The following embodiment takes a battery module including two cell groups as an example to illustrate this in detail.See FIG. 1, FIG. 1 is a schematic diagram of the structure of the collector plate 011 provided by the embodiment of the present application. An embodiment of the present application provides a collector plate 011 that is applied to a battery module. The battery module consists of two cell groups. The collector plate 011 includes a collector sub plate 111 and a flexible conductive connection plate 112. There are two sub-sheets 111. The two lower collecting plates 111 are arranged next to one another. The two collecting sub-plates 111 are each set such that they collect the working signals of the two cell groups. The connecting plate 112 is arranged between two lower collecting plates 111. The two ends of the connection plate 112 are respectively connected to two sub-collector plates 111, and the connection plate 112 is provided with a first bending structure 1121, and the first bending structure 1121 is arranged to deform as the two cell groups move away from or towards each other.It can be understood that when the two cell groups move away from or towards each other, the first bending structure 1121 undergoes a flexible deformation because the connection sheet 112 is flexible. When the connecting sheet 112 is an elastic sheet, the first bending structure 1121 also has elastic deformation. Among them, the working signal is mainly the voltage signal of the cell and the temperature signal of the cell group.In addition, the sub-collector sheet 111 includes a voltage collecting portion 1113, the voltage collecting portion 1113 is connected to the bus bar 131, and the bus bar 131 is connected to the cell, so that the sub-collector sheet 111 receives the voltage signal of the cell. And the cell group includes a plurality of cells connected in series or in parallel via the bus 131.For example, the lower collector plate 111 and the connecting plate 112 are both flexible circuit boards, and the collector plate 011 is an integral molded part. A flexible printed circuit board is a structure etched with aluminum foil or copper foil and shaped to have multiple lines for the transmission of electrical signals.In this embodiment, a first bending structure 1121 is disposed at the part where the collector plate 011 is located between two cell groups, so that the collector plate 011 has a buffer part formed based on the first bending structure 1121, so that when the cell group generates thermal expansion, the buffer part can generate deformation to buffer the expansion between the cell groups to draw the collector plate 011, to improve the stability of the welding part between the collector plate 011 and the cell and to prevent the collector plate 011 from being torn, and finally, the reliability of the collector plate 011 can be improved.Moreover, due to the assembly tolerance between the cell pack and the battery box 002. Therefore, when assembling the cell group into the battery box 002, the first bending structure 1121 can be extruded or stretched to fit the two manifolds 111 to the mounting position of the cell group, so that the stress or extrusion of the connection between the manifold 011 and the cell group caused by the mounting error can be improved, and the reliability of the connection between the manifold 011 and the cell group can be improved.Referring to FIG. 2, 2 is a side view of the collector plate 011 provided in the embodiment of the present application. In an embodiment, the connection sheet 112 comprises a connection sheet body and a first bending structure 1121, and the first bending structure 1121 is convex toward the cell group from the position of the connection sheet 112.It can be understood that a bus bar 131 is disposed between the collector sub-panel 111 and the cell, and the voltage collecting portion 1113 of the collector panel 011 is welded to the bus bar 131 to collect the voltage information of the cell. The first bending structure 1121 is not used for collecting voltage signals, so that a cell group facing side is a collection beam 012.Based on this, in this embodiment, the position of the self-connecting sheet 112 of the first bending structure 1121 is convex to the cell group, so that the collector sheet 011 can have a structure for buffering the collector sheet 011 to be drawn or extruded, and the first bending structure 1121 overlaps with the bus bar 131 in the cell axial direction, so that the adjustment of the first bending structure 1121 can be prevented from increasing the height of the collector assembly 001, and then the assembly of the internal electric parts of the battery pack is facilitated.Referring to FIG. 2, in an embodiment, the first bending structure 1121 includes a first surface 11211, and the first surface 11211 is located at the center of the first bending structure 1121 and is oriented toward the cell group. The first surface 11211 is parallel to the lower collector plate 111.It can be understood that the first bending structure 1121 is a U-shaped structure convex toward the cell group, and that the cell group facing side of the center is the first surface 11211. Specifically, the connecting plate 112 includes two extension segments and a first bending structure 1121 disposed between the two extension segments. The two extension segments are connected to two respective collector sub-plates 111. The first bending structure 1121 includes a first bending portion, a second bending portion, and a third bending portion, which are sequentially connected to each other. The first bending cross section and the third bending cross section are opposed to each other. The ends of the first bending portion and the third bending portion that are different from the second bending portion are connected to two extension portions, respectively. The cell group facing side of the second bending portion is the first surface 11211.In this embodiment, by the above arrangement, the first bending structure 1121 has a longer length in a certain space, so that the first bending structure 1121 has a larger buffer size, and then the first bending structure 1121 can exert a better buffer effect in a limited space.Referring to FIG. 2, in one embodiment, the corners of the first bending structure 1121 are all provided with rounded corners.It is understood that the connection between the first extension and the first bending portion, the connection between the first bending portion and the second bending portion, the connection between the second bending portion and the third bending portion, and the connection between the third bending portion and another extension portion are all corners. Rounded corners are provided at the above-mentioned terminals. The fillet is formed by bending the connecting sheet 112.In this embodiment, by disposing a fillet at the corner of the first bending structure 1121, the stress at the corner can be reduced to improve the impact strength of the baffle 011 and then to improve the reliability of the baffle 011.Referring to FIG. 2, in one embodiment, in two sub-collector sheets 111, one is an output sub-collector sheet 111. The output collecting sub-plate 111 has a first signal output terminal 1111. The output collector sub-sheet 111 is provided with a second bending structure 1112, and the second bending structure 1112 is disposed near the first signal output terminal 1111. The second bending structure 1112 is set to deform as the first signal output terminal 1111 and the cell group move away from or towards each other.It is understood that the first signal output terminal 1111 is connected to the BMS board. Normally, the first signal output terminal 1111 is connected to the BMS board via the connector 063 to transmit the collected work signal to the BMS board. Moreover, in the two sub-plates 111, the sub-plate 111 that is closer to the BMS board is the output sub-plate 111, and an end of the output sub-plate 111 near the BMS board is the first signal output terminal 1111.Since the first signal output terminal 1111 is connected to the BMS board, the first signal output terminal 1111 is fixed. When the cell generates heat and expands, it pulls the connection between the first signal terminal and the BMS board. Based on this, in this embodiment, a second bending structure 1112 is disposed at an end of the output sub-sheet 111 in the vicinity of the first signal output terminal 1111, so that an end of the output sub-sheet 111 in the vicinity of the first signal output terminal 1111 has a structure for buffering the pulling of the first signal end when the cell group expands to improve the reliability of the connection between the sub-sheet 011 and the BMS board and prevent the sub-sheet 011 from being torn.Referring to FIG. 2, in an embodiment, the second bending structure 1112 is an arc-shaped structure, and its concave surface is different from the first signal output terminal 1111.For example, the side of the second bending structure 1112 facing away from the first signal output 1111 is tangential to the side of the lower collector plate 111 located on the side of the second bending structure 1112 that deviates from the first signal output 1111.In this embodiment, the stress of the second bending structure 1112 can be reduced by setting the second bending structure 1112 to an arc-shaped structure, thereby improving the impact strength of the collector plate 011, thereby improving the reliability of the collector plate 011.Referring to FIGS. 3, 3, a larger view of A in FIG. 1, in an embodiment, the lower collector plate 111 includes a stress collecting portion 1113. The stress accumulating portion 1113 is provided with an accumulating gap 1114. In the collection notch 1114, a collection end plate 1115 set to collect the voltage of the cell group is disposed. The collection end plate 1115 has a relative first end and a second end, and the first end is connected to the surface of one side of the collection notch 1114. The second end is connected to the surface of the other side of the collection notch 114; a gap 1116 exists between the collection end plate 1115 and the collection notch 1114 from the first end to the second end.It can be understood that the voltage collecting portion 1113 is the portion connected to the bus bar 131 on the collector lower sheet 111. Specifically, the collection end plate 1115 is welded to the bus bar 131 to collect the voltage information of the cell.In this embodiment, on the one hand, by the above setting, the lower collector plate 111 can collect the voltage information of the cell; on the other hand, the tensile force on the collecting end plate 1115 when expanding the cell acts mainly on the first and second ends of the collecting end plate 1115, so that the tensile force of the collecting end plate 1115 can be reduced and dropping of the brazing joint between the collecting end plate 1115 and the bus bar 131 can be prevented, so that the stability of the connection between the collecting end plate 1115 and the bus bar 131 can be improved.Referring to FIG. 3, in an embodiment, the second end of the collection end plate 1115 is joined to the surface of the other side of the collection notch 1114 by a joining structure. The connection structure is set to be disconnected when the lower collector sheet 111 is pulled.It can be understood that the tensile force of the disconnected structure is less than the tensile force when disconnecting the connection between the collection end plate 1115 and the bus bar 131. Moreover, the connection structure fixes the collector end plate 1115 in the collector notch 1114, so that the second end of the collector end plate 1115 can be prevented from dropping due to gravity and causing collapse, so that convenience of collector assembly can be secured.In this embodiment, the second end of the collection end plate 1115 is connected to the surface of the collection notch 1114 by a connection structure, so that when the collection end plate 1115 is subjected to a large tensile force, the connection structure at one end of the collection end plate 1115 can be released by the tensile force to reduce the tensile force received from the collection end plate 1115, so that the brazing between the collection end plate 1115 and the bus bar 131 can be prevented, and the stability of the connection between the collection end plate 1115 and the bus bar 131 can be improved.The joint structure may be a structure having a thickness thinner than that of the collection end plate 1115 or a material having strength lower than the strength of the joint between the first end of the collection end plate 1115 and the collection notch 1114. Specifically, the connection structure includes a connection strip 1117. The both ends of the connection strip 1117 are connected to the second end of the collection end plate 1115 and the surface of the collection notch 1114, respectively. The central part of the connecting strip 1117 is provided with a cutting notch 11171. The cut notch 11171 is set to separate when the lower collector sheet 111 is pulled.Referring to FIG. 3, in one embodiment, a buffer notch 11151 is disposed on the collection end plate 1115. The buffer notch 11151 is located between the first end of the collection end plate 1115 and the second end of the collection end plate 1115.In the present embodiment, by setting a buffer notch 11151, the voltage of the collection end plate 1115 at the time of heating and expansion can be relieved, and then the stability of connection between the collection end plate 1115 and the bus bar 131 can be improved.Referring to FIG. 1, in an embodiment, the edge of the collection sub-sheet 111 is connected to a bending end sheet 113 set to detect the temperature of the cell group.It is understood that the bending end plate 113 is located at the outer edge of the lower collector plate 111 and is formed integrally with the lower collector plate 111.In this embodiment, by using the bending end plate 113 to collect the temperature information of the cell group, the deformation capacity of the bending end plate 113 can be used to buffer the drawing of the collecting plate 011 by the heating expansion of the cell to improve the load capacity of the collecting plate 011, and then to prevent the collecting plate 011 from being torn or separated between the bending end plate 113 and the collecting sub plate 111, so that the reliability of the collecting plate 011 can be improved.Referring to Figs. 4, 4, a schematic diagram of the structure of the collection assembly 001 provided in the embodiment of the present application. Accordingly, the embodiment of the present application provides a collection assembly 001. The collector assembly 001 includes a collector beam 012, a busbar group 013, and the aforementioned collector plate 011. There are two in the bus group 013. Two busbar groups 013 are arranged in parallel on the busbar carrier 012. The two bus groups 013 are each set to be connected to two cell groups. The two collector sub-plates 111 are each connected to two busbar groups 013. The connection plate 112 is located between two adjacent busbar groups 013.For example, the first bending structure 1121 includes two and is spaced at intervals along the arrangement direction of the two sub-collector sheets 111. The first bending structure 1121 is formed protruding from the position of the connecting plate 112 toward the cell group. The lower collector plate 111 is disposed on the collector support 012. A groove 121 is formed on the collector beam 012. Two grooves are located in the groove 121. The two first bending structures 1121 are respectively located in two grooves 121 as shown in FIG. 5, and FIG. 5 is an enlarged view at B in FIG. 4. The gap 1116 between the first bending structure 1121 and the groove 121 is used to provide deformation space for the first bending, so that the deformation of the first bending is not obstructed.In addition, the concave surface of the second bending structure 1112 is aligned with the end face of the collection beam 012 as shown in FIG. 6, and FIG. 6 is an enlarged view of the location C in FIG. 4.The collecting carrier 012 is a blister carrier. The bus bar group 013 includes a plurality of bus bars 131, and the bus bar 131 is used for parallel connection of two adjacent cells. Accordingly, a plurality of voltage collecting portions 1113 are disposed on the lower collector plate 111, and a plurality of voltage collecting portions 1113 are respectively connected to a plurality of bus bars 131. The bus bar 131 is an O-state aluminum rail. The bus bar 131 is welded to the pole of the cell. And the connection structure between the bus bar 131 and the sub-collector sheet 111 is illustrated in FIG. 7, and FIG. 7 is an enlarged view of the location D in FIG. 4. Specifically, one end of the conductive plate 132 is welded to the part on the collection end plate 1115 located between the buffer notch 11151 and the second end of the collection end plate 1115, and the other end is welded to one end of the bus bar 131 in the vicinity of the collection plate 111.In this embodiment, by adopting the aforementioned baffle 011, when the cell group generates thermal expansion, the first bending structure 1121 can be used to generate deformation to buffer the expansion between the cell groups upon drawing the baffle 011, to improve the stability of the welded part between the baffle 011 and the cell and to prevent the baffle 011 from being torn, and finally to improve the reliability of the collecting assembly 001.FIG. 8 is a schematic diagram of the structure of the battery pack provided in the embodiment of the present application (in order to facilitate the illustration of the internal structure of the battery pack, the cover of the battery box 002 is hidden in FIG. 8 ). Accordingly, the embodiment of the present application further provides a battery pack including a battery box 002, a battery module 008, a BMS board, and the aforementioned collection assembly 001. The battery box 002 has a first accommodation cavity 021 and a second accommodation cavity 022 distributed along the longitudinal direction. The battery module 008 is disposed in the first accommodation cavity 021. The battery module 008 comprises two longitudinally distributed cell groups 081. The BMS board is disposed in the wide accommodation cavity 022. The collection assembly 001 is disposed in the first accommodation cavity 021. Here, two bus bars 131 of the bus bar group 013 are connected to two cell groups 081, respectively. Of the two sub-collector sheets 111, one is the output sub-collector sheet 111. The first signal output terminal 1111 of the output manifold sub-sheet 111 is connected to the BMS board. Specifically, the first signal output terminal 1111 is connected to the BMS board via the connector 063.For example, the interior cavity of the battery pack is separated by the end separator 025 between the first receiving cavity 021 and the second receiving cavity 022. In addition, a cross beam 023 is arranged in the first receiving cavity 021. The crossbar 023 is connected to the cavity wall of the first receiving cavity 021. The cross beam 023 is located between the two cell groups 081 of the battery module 008 to separate the two cell groups 081.In this embodiment, by adopting the aforementioned collecting assembly 001, when the cell group 081 generates heat and expands, the first bending structure can be used to generate deformation, to buffer the stress of the collector plate 011 by the expansion between the cell group 081, to improve the stability of the welded part between the collector plate 011 and the battery cell, and to prevent the collector plate 011 from being torn, and finally to improve the reliability of the battery pack.As shown in FIG. 8, in one embodiment, there are four battery modules 008 and header assemblies 001. Four battery modules 008 are arranged one after another in the first accommodation cavity 021 in the transverse direction. Transverse perpendicular to longitudinal. Two battery modules 008 and two collecting assemblies 001 are constructed one by one. In order to improve the installation stability of the battery module 008, a longitudinal beam 024 is arranged between the two adjacent battery modules 008, and the longitudinal beam 024 is connected to the inner wall of the battery box 002.It is understood that the four battery modules 008 correspond to eight cell groups 081. Eight cell groups 081 are connected in series with each other by O-state aluminum rods.As shown in FIG. 8, in an embodiment, the battery pack further includes a BDU (Battery Energy Distribution Unit), a battery charge-discharge interface, and a charge-discharge connection rail. The BDU is disposed on the second accommodation cavity 022, and the battery charge-discharge interface is disposed on a side of the battery box 002 away from the second accommodation cavity 022, and the both ends of the charge-discharge terminal row are connected to the BDU and the battery charge-discharge interface, and the charge-discharge terminal row is disposed on an end of the longitudinal beam 024 deviating from the bottom wall of the battery box 002.For example, the charge-discharge tie rod includes an intermediate row and an end row, the end row has two, one end row connects one end of the middle row to the BDU, and the other end bar connects the other end of the middle row to the charge-discharge interface of the battery, and the end row is a soft metal rod. The middle row is a 6 series aluminum rod and the end row is specifically a copper rod. The end row and the middle row are welded together by polymer diffusion welding. The soft copper rod may be deformed during installation to effectively absorb assembly tolerance, thereby improving convenience in connecting the charge / discharge port to the BDU and battery charge / discharge interface. At the same time, the soft copper rod can well absorb the tensile force caused by the vibrations of the vehicle during running, and prevent the disconnection or leakage of the high voltage circuit caused by the tension force of the charging and discharging connecting rod.Moreover, the battery pack is further provided with a quick charging interface 071. The fast charge interface 071 is located on the side of the battery pack near the BDU.In the conventional installation method, the charge-discharge terminal bar is disposed on the wall of the battery box 002. And the charge-discharge terminal row needs to maintain a safety distance from the bus bar 131 and the battery cell, so that the first inner cavity needs to have enough space in the transverse direction, so that the safety distance between the mentioned components needs to be maintained while the respective components are installed.Based thereon, in this embodiment, the charge-discharge terminal row is disposed on the longitudinal beam 024, on the one hand, the space occupied by the longitudinal beam 024 can be used, so that the required installation space of the charge-discharge terminal row can correspond to the space of the longitudinal beam 024, and the utilization rate of the internal space of the battery pack is improved. Therefore, the original space for the arrangement of the charging and discharging connection rods can be used to increase the lateral size of the battery cells to improve the energy density of the battery pack. On the other hand, the charge-discharge connection rail is disposed on the longitudinal beam 024, whereby it can be prevented that the insulation layer of the charge-discharge connection rail is broken due to the extrusion of the outer wall of the battery pack to improve the reliability of the battery pack.See FIG. 9, FIG. 9 is a schematic diagram of the wiring between the battery charging and discharging interface of the battery pack and the BDU provided in the embodiment of the present application. In one embodiment, the battery charge-discharge interface includes a charge interface 051 and a discharge interface 052. The charge-discharge terminal bar is composed of a charge-plus electrode row 041, a discharge-plus electrode row 042, and a charge-discharge-minus electrode row 043. The positive electrode terminal of the charging interface 051 is connected to the positive electrode 031 of the BDU via the charging plus electrode row 041. The positive terminal of the discharge interface 052 is connected to the positive electrode 031 of the BDU via the discharge plus electrode row 042. One end of the charging and discharging minus electrode row 043 is connected to the minus electrode terminal of the charging interface 051 and the minus electrode terminal of the discharging interface 052, and the other end is connected to the minus electrode 032 of the BDU.In FIG. 9, from left to right, the three long solid wires in the middle of the charge plus electrode row 041, the charge and discharge minus electrode row 043, and the discharge plus electrode row 042 are in sequence.In this embodiment, by the above arrangement, the charging minus electrode row and the discharging minus electrode row of the battery pack share a metal rod, so that the number of electric parts of the battery pack can be reduced, and the mounting efficiency of the battery pack can be improved, and the manufacturing cost of the battery pack can be reduced.Moreover, the harness connection of the partial collective signal of the battery pack is illustrated in FIG. 10, and FIG. 10 is the schematic circuit diagram of the collective harness of the battery pack provided in the embodiment of the present application. The BMS board consists of the BMS motherboard 061 and three BMS slave boards 062.As can be understood, the battery consists of four battery modules 008. Each battery module 008 includes two cell groups 081. The two cell groups 081 include 25 cells and 26 cells, respectively. Therefore, there are many signal sources, and only one BMS motherboard 061 is not conducive to data processing. On the basis of this, the BMS board is configured as a BMS motherboard 061 and three BMS slave boards 062 to improve data processing efficiency and improve the reliability of signal detection of the battery pack. Specifically, after the BMS converts the analog signal from the collector plate 011 into a digital signal from the board 062, the signal is transmitted to the BMS main board 061 via a daisy chain, and the BMS main board 061 is connected to the control system of the automobile via the communication interface 072.

Claims

A collector plate applied to a battery module comprising a plurality of cell groups, the collector plate comprising: a plurality of collector sub-plates arranged side by side and each configured to collect working signals of the plurality of cell groups; a flexible conductive connection plate provided between each two adjacent collector sub-plates, wherein both ends of the connection plate are connected to the two adjacent collector sub-plates, wherein the connection plate is provided with a first bending structure, and the first bending structure is configured to deform as the two cell groups move away from or towards each other.The collector plate according to claim 1, wherein the connecting plate comprises a connecting plate body and a first bending structure, and the first bending structure is formed convexly from the position of the connecting plate body toward the cell group.The collector plate of claim 2, wherein the first bending structure has a first surface, wherein the first surface is at the center of the first bending structure and faces the cell group, and wherein the first surface is parallel to the collector sub-plate.The collector plate of claim 3, wherein a fillet is formed at the corner of the first bending structure.The collector plate according to any one of claims 1 to 4, wherein the plurality of collector plates comprise an output collector plate, the output collector plate having a first signal output end and being provided with a second bending structure, the second bending structure being disposed near the first signal output end and being configured such that the second bending structure deforms as the first signal output end and the cell group move away from or towards each other.The collector plate of claim 5, wherein the second bending structure is an arcuate structure having a concave surface facing away from the first signal output end.The collector plate according to any one of claims 1 to 6, wherein the collector sub plate has a stress collecting portion, the stress collecting portion is provided with a collecting notch, a collecting end plate is disposed in the collecting notch, the collecting end plate is configured to collect the stress of the cell group, the collecting end plate has a first end and a second end that are opposed to each other, the first end being connected to one side surface of the collecting notch and the second end being connected to the other side surface of the collecting notch; wherein a gap exists between the collecting end plate and the collecting notch in a direction from the first end to the second end.The collector plate according to claim 7, wherein the second end of the collector end plate is connected to the other side surface of the collector notch by a connection structure, and the connection structure is formed to be separated when the collector under plate is pulled.The collector plate according to claim 8, wherein the connecting structure comprises a connecting strip, the two ends of the connecting strip are respectively connected to the second end of the collector end plate and the surface of the collector notch, while the central part of the connecting strip is provided with a cutting notch, and the cutting notch is formed to be separated when the collector lower plate is pulled.The collector plate according to any one of claims 7 to 9, wherein a buffer notch is provided on the collector end plate, the buffer notch being arranged between the first end and the second end of the collector end plate.The collector plate according to any one of claims 1 to 10, wherein the edge of the collector sub-plate is connected to a bending end plate configured to detect the temperature of the cell group.A collector assembly comprising: a collector beam; a plurality of bus bar groups arranged side by side on the collector beam and each formed to be connected to the plurality of cell groups; a collector sheet according to any one of claims 1 to 11, wherein the plurality of collector sub-sheets are each connected to the plurality of bus bar groups, and the connection sheet is located between each two adjacent bus bar groups.A battery pack, comprising: a battery box provided with a first accommodation cavity and a second accommodation cavity, the first accommodation cavity and the second accommodation cavity being distributed in the longitudinal direction; a battery module disposed in the first accommodation cavity, the battery module comprising a plurality of cell groups along the longitudinal direction; a BMS board disposed in the second accommodation cavity; the collection assembly according to claim 12, wherein the collection assembly is disposed in the first accommodation cavity; wherein the plurality of bus bar groups are respectively connected to the plurality of cell groups, and the first signal output end of the output collection sub-sheet of the plurality of collection sub-sheets is connected to the BMS board.The battery pack of claim 13, wherein the battery module and the collection assembly are provided in a plurality, the plurality of battery modules are arranged one after another along the transverse direction in the first accommodation cavity, the transverse direction is perpendicular to the longitudinal direction, and the plurality of battery modules and the plurality of collection assemblies are uniquely associated.The battery pack of claim 14, wherein a longitudinal beam is disposed between each two adjacent battery modules, and the longitudinal beam is connected to the inner wall of the battery box.The battery pack of claim 15, further comprising a BDU, a battery charge-discharge interface, and a charge-discharge terminal row, wherein the BDU is disposed in the second receiving cavity, the battery charge-discharge interface is disposed on a side of the battery box opposite the second receiving cavity, the both ends of the charge-discharge terminal row are connected to the BDU and the battery charge-discharge interface, and the charge-discharge terminal row is disposed at an end of the longitudinal beam opposite the bottom wall of the battery box.The battery pack of claim 16, wherein the battery charge-discharge interface comprises a charge interface and a discharge interface, wherein the charge-discharge terminal row comprises a charge-plus electrode row, the discharge-plus electrode row, and a charge-discharge-minus electrode row, wherein a plus electrode terminal of the charge interface is connected to a plus electrode terminal of the BDU via the charge-plus electrode row, and a plus electrode terminal of the discharge interface is connected to a plus electrode terminal of the BDU via the discharge-plus electrode row, wherein an end of the charge-discharge-minus electrode row is connected to a minus electrode terminal of the charge interface and a minus electrode terminal of the discharge interface, and the other end is connected to the negative electrode terminal of the BDU.The battery pack of claim 16 or 17, wherein the charge-discharge terminal row comprises a middle row and two end rows, one end row connecting one end of the middle row to the BDU, the other end row connecting the other end of the middle row to the battery charge-discharge interface, and the end row being a soft metal row.

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