Integrated busbar and battery module

Abstract

The utility model discloses an integrated busbar and a battery module, and belongs to the technical field of battery energy storage. The integrated busbar comprises a first bus assembly and a second bus assembly. The first busbar and the second busbar are arranged side by side, the positive plate is arranged on the front side of the first busbar, the negative plate is arranged on the front side of the second busbar, and the series connection piece is arranged on the rear sides of the first busbar and the second busbar; the second bus assembly comprises a third bus bar and a fourth bus bar which are arranged side by side, the third bus bar is arranged corresponding to the first bus bar, and the fourth bus bar is arranged corresponding to the second bus bar. According to the integrated busbar and the battery module provided by the invention, a double-layer layout of combining the first confluence assembly and the second confluence assembly is adopted, so that the problem that current needs to be led out through long flexible connection in a traditional single-layer confluence busbar is effectively avoided, and the internal resistance of the module is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery energy storage, and particularly relates to an integrated busbar and battery module. BACKGROUND

[0002] With the rapid development of the new energy industry, energy storage technology has been widely applied in the fields of power systems, transportation tools and household energy storage. Among them, the blade cell gradually becomes a widely used cell form in the energy storage product due to its high energy density, long cycle life and excellent safety performance. In practical application, in order to realize the electrical connection and management of the blade cell, the cell integrated busbar (CCS) is usually used to complete the electrical connection of the battery module. However, in the current technical scheme, the existing cell integrated busbar design mostly has some problems to be improved.

[0003] In the prior art, the cell integrated busbar of the blade cell energy storage product mainly adopts a single-layer structure. After the integrated busbar of the single-layer structure is assembled, the total positive electrode and the total negative electrode of the module are usually located at the two ends of the module. Since the total positive electrode and the total negative electrode are distributed at the two ends of the module, a long soft connection is needed to guide the current from one end to the other end to realize the overall connection of the battery module. However, the use of the long soft connection will cause the high resistance of the soft connection, increase the internal resistance of the entire module, and thus directly affect the energy transmission efficiency of the battery, resulting in the decline of the battery energy efficiency. In addition, the soft connection is easily affected by mechanical vibration and thermal effect in long-term use, and may have problems such as poor contact or aging of the connection part, thereby reducing the reliability and service life of the module.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a new solution. CONTENT OF THE UTILITY MODEL

[0005] The application aims to provide an integrated busbar and battery module which can avoid the use of long soft connection, reduce the internal resistance of the battery module, and improve the battery energy efficiency.

[0006] To achieve the above-mentioned purpose, the technical scheme provided by the application is as follows:

[0007] In a first aspect, the present application provides an integrated busbar, comprising a first busbar assembly and a second busbar assembly; the first busbar assembly comprises a positive electrode sheet, a negative electrode sheet, a series sheet, and first and second busbars arranged side by side, the positive electrode sheet is arranged at the front side of the first busbar, the negative electrode sheet is arranged at the front side of the second busbar, and the series sheet is arranged at the back side of the first and second busbars; the second busbar assembly comprises third and fourth busbars arranged side by side, the third busbar is arranged corresponding to the first busbar, and the fourth busbar is arranged corresponding to the second busbar; wherein the first and third busbars are used to connect the cell units of the upper battery group of the series battery module, the second and fourth busbars are used to connect the cell units of the lower battery group of the series battery module, and the series sheet is used to connect the upper and lower battery groups in series.

[0008] In one or more embodiments, the first busbar comprises a plurality of spaced conductive sheets, each of which is used to connect the first side electrodes of two adjacent cell units in the upper battery group; and the second busbar comprises a plurality of spaced conductive sheets, each of which is used to connect the first side electrodes of two adjacent cell units in the lower battery group.

[0009] In one or more embodiments, the third busbar comprises a plurality of spaced conductive sheets, each of which is used to connect the second side electrodes of two adjacent cell units in the upper battery group; and the fourth busbar comprises a plurality of spaced conductive sheets, each of which is used to connect the second side electrodes of two adjacent cell units in the lower battery group.

[0010] In one or more embodiments, the conductive sheet comprises a first connecting portion and a second connecting portion, and the first and second connecting portions are respectively used to electrically connect the same side electrodes of two adjacent cell units in the battery module.

[0011] In one or more embodiments, the first connecting portion of a first conductive sheet in the first busbar and the second connecting portion of a conductive sheet in the third busbar are respectively connected to the two poles of the same cell unit; the second connecting portion of the first conductive sheet in the first busbar and the first connecting portion of another conductive sheet in the third busbar are respectively connected to the two poles of the adjacent another cell unit; and / or the first connecting portion of a second conductive sheet in the second busbar and the second connecting portion of a conductive sheet in the fourth busbar are respectively connected to the two poles of the same cell unit; the second connecting portion of the second conductive sheet in the second busbar and the first connecting portion of another conductive sheet in the fourth busbar are respectively connected to the two poles of the adjacent another cell unit.

[0012] In one or more embodiments, the conductive sheet is provided with a buffer portion, which is arched towards a direction away from a connecting surface of the conductive sheet and the battery cell unit, and the buffer portion is located between the first connecting portion and the second connecting portion.

[0013] In one or more embodiments, the first connecting portion and the second connecting portion are provided with through-welding holes corresponding to the electrode positions of the battery cell unit.

[0014] In one or more embodiments, the first busbar assembly further comprises a first isolation plate, the front end of the first isolation plate is provided with a first receiving groove for accommodating the positive electrode sheet and the negative electrode sheet, the rear end of the first isolation plate is provided with a second receiving groove for accommodating the series connection sheet, and the first receiving groove and the second receiving groove are provided with a third receiving groove for accommodating the first busbar and the second busbar.

[0015] In one or more embodiments, the second busbar assembly further comprises a second isolation plate, the second isolation plate is provided with a fourth receiving groove for accommodating the third busbar and the fourth busbar, and the fourth receiving groove is arranged corresponding to the third receiving groove.

[0016] In one or more embodiments, the first isolation plate and the second isolation plate are made of plastic, the positive electrode sheet, the negative electrode sheet, the series connection sheet, the first busbar and the second busbar are fixed on the first isolation plate by hot melting, and the third busbar and the fourth busbar are fixed on the second isolation plate by hot melting.

[0017] In one or more embodiments, the third receiving groove comprises a plurality of first receiving portions arranged at intervals, and a first isolation portion is protruding between two adjacent first receiving portions; and / or the fourth receiving groove comprises a plurality of second receiving portions arranged at intervals, and a second isolation portion is protruding between two adjacent second receiving portions.

[0018] In one or more embodiments, the first isolation plate is provided with a plurality of first connecting through-holes corresponding to the electrodes of the battery cell unit in the battery module; and / or the second isolation plate is provided with a plurality of second connecting through-holes corresponding to the electrodes of the battery cell unit in the battery module.

[0019] In one or more embodiments, the first busbar assembly further comprises a first collection wire harness connected to the positive electrode sheet, the negative electrode sheet, the series connection sheet, the first busbar and the second busbar, the first collection wire harness comprising a temperature collection wire, a voltage collection wire and a connector for connecting a battery management unit; and / or the second busbar assembly further comprises a second collection wire harness connected to the third busbar and the fourth busbar, the second collection wire harness comprising a temperature collection wire, a voltage collection wire and a connector for connecting a battery management unit.

[0020] Secondly, this application provides a battery module comprising a lower battery pack, an upper battery pack, and the aforementioned integrated busbar. The lower battery pack includes a plurality of battery cells arranged in sequence. The upper battery pack is stacked on top of the lower battery pack, and the upper battery pack also includes a plurality of battery cells arranged in sequence. The first and third buses of the integrated busbar are connected in series with the battery cells of the upper battery pack, and the second and fourth buses are connected in series with the battery cells of the lower battery pack. The series connection links connect the upper battery pack and the lower battery pack, the positive electrode is connected to the common positive electrode of the upper and lower battery packs, and the negative electrode is connected to the common negative electrode of the upper and lower battery packs.

[0021] In one or more embodiments, the positive and negative electrodes of each cell unit in the lower battery pack are located on both sides of the cell unit, and the positive and negative electrodes of any two adjacent cell units face opposite directions; and / or the positive and negative electrodes of each cell unit in the upper battery pack are located on both sides of the cell unit, and the positive and negative electrodes of any two adjacent cell units face opposite directions.

[0022] Compared with the prior art, this application has the following beneficial effects:

[0023] This application adopts a two-layer layout combining a first busbar component and a second busbar component, which effectively avoids the problem of needing to lead out current through a long soft connection in the traditional single-layer busbar, reduces the internal resistance of the module, and thus improves energy transmission efficiency and overall battery performance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of a battery module in one embodiment of this application;

[0026] Figure 2 for Figure 1 An exploded view of the battery module shown.

[0027] Figure 3 for Figure 1 An exploded view of the battery module shown from another perspective;

[0028] Figure 4 This is an exploded view of the first busbar component in one embodiment of this application;

[0029] Figure 5 Figure 8 is an exploded view of a second busbar assembly in an embodiment of the present application;

[0030] Figure 6 Figure 9 is a perspective view of a conductive sheet in an embodiment of the present application;

[0031] Figure 7 Figure 10 is an exploded view of a battery cell unit and a conductive sheet in an embodiment of the present application;

[0032] Figure 8 Figure 11 is a cross-sectional view of a connection relationship between a battery cell unit and a conductive sheet in an embodiment of the present application.

[0033] Main figure mark explanation:

[0034] 1 - upper battery pack, 2 - lower battery pack, 3 - integrated busbar, 31 - first busbar assembly, 311 - positive sheet, 312 - negative sheet, 313 - series sheet, 314 - first busbar, 315 - second busbar, 316 - first collection wire harness, 32 - second busbar assembly, 321 - third busbar, 322 - fourth busbar, 323 - second collection wire harness, 33 - joint, 4 - battery cell unit, 41 - first side electrode, 42 - second side electrode, 5 - conductive sheet, 51 - first connecting part, 52 - second connecting part, 53 - buffer part, 54 - welding hole, 6 - first isolation plate, 61 - first receiving groove, 62 - second receiving groove, 63 - third receiving groove, 631 - first receiving part, 632 - first isolation part, 64 - first connecting through hole, 7 - second isolation plate, 71 - fourth receiving groove, 711 - second receiving part, 712 - second isolation part, 72 - second connecting through hole. DETAILED DESCRIPTION

[0035] In order to enable persons skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the protection scope of the present application.

[0036] Unless otherwise explicitly indicated, in the entire specification and claims, the term “comprise” or its variants such as “contain” or “include” and the like will be understood to include the stated element or component, but not exclude other elements or components.

[0037] With the wide application of energy storage products in the field of new energy, blade cells gradually become mainstream due to their high energy density and reliability. However, as the scale of energy storage systems expands and application requirements diversify, the existing cell integrated busbar (CCS) design gradually exposes many deficiencies, limiting the further development and application of blade cell energy storage products.

[0038] The existing integrated busbar design of blade cell energy storage modules mainly adopts a single-layer structure, which exposes several defects in practice. The single-layer busbar structure causes the total positive and negative poles of the battery module to be usually located at both ends of the module, requiring long soft connections to draw current from one end of the module. This connection method significantly increases the internal resistance of the module, leading to reduced battery energy efficiency. At the same time, long soft connections are prone to poor contact, aging, and other issues in complex operating environments, further affecting the performance and reliability of the module.

[0039] To address the problems in the prior art, the present application proposes a double-layer layout integrated busbar scheme for blade cell energy storage modules. The core idea is to optimize the structure and layout of the busbar to achieve efficient series connection of cell units while reducing internal resistance and optimizing assembly convenience and module reliability.

[0040] The integrated busbar scheme introduces an upper and lower busbar structure in the battery module, which is used to connect the cell units of the upper and lower battery groups. Through the double-layer layout design, the total positive and negative poles of the module can be arranged on the same side of the module, eliminating the design defect of long soft connections in traditional schemes, thereby reducing the internal resistance of the module. This double-layer layout not only optimizes the current path, reduces energy transmission losses, but also simplifies the wiring of the wire harness, avoids complex cross-connections, and improves assembly convenience and system reliability.

[0041] Please refer to Figures 1 to 3 , the battery module in an embodiment of the present application includes an upper battery group 1, a lower battery group 2, and an integrated busbar 3. The upper battery group 1 is stacked on the lower battery group 2, and the upper battery group 1 includes a plurality of cell units 4 arranged in sequence. The lower battery group 2 also includes a plurality of cell units 4 arranged in sequence, and the cell units 4 of the lower battery group 2 correspond one-to-one to the cell units 4 of the upper battery group 1. The integrated busbar 3 is used to connect the cell units 4 in the upper battery group 1 and the lower battery group 2.

[0042] In an exemplary embodiment, please refer to Figure 2 and Figure 3As shown, the integrated busbar 3 includes a first busbar assembly 31 and a second busbar assembly 32. The first busbar assembly 31 includes a positive pole tab 311, a negative pole tab 312, a series tab 313, and first and second busbars 314 and 315 arranged side by side, the positive pole tab 311 being arranged at the front side of the first busbar 314, the negative pole tab 312 being arranged at the front side of the second busbar 315, and the series tab 313 being arranged at the back side of the first and second busbars 314 and 315. The second busbar assembly includes third and fourth busbars 321 and 322 arranged side by side, the third busbar 321 being arranged corresponding to the first busbar 314, and the fourth busbar 322 being arranged corresponding to the second busbar 315.

[0043] The first and third busbars 314 and 321 are used to connect the battery cells 4 of the upper battery group 1 in series, the second and fourth busbars 315 and 322 are used to connect the battery cells 4 of the lower battery group 2 in series, and the series tab 313 is used to connect the upper battery group 1 and the lower battery group 2 in series.

[0044] The positive and negative pole tabs 311 and 312 are arranged at the front side of the first and second busbars 314 and 315, respectively, and are responsible for collecting the total positive and negative pole signals of the battery module and providing an interface for external output. The series tab 313 is arranged at the back side of the first and second busbars 314 and 315, and its main function is to form part of the overall circuit, thereby connecting the battery cells 4 of the upper and lower battery groups 1 and 2 in series.

[0045] The second busbar assembly 32 cooperates with the first busbar assembly 31 to form a design of double-layer layout (located on the left and right sides of the upper and lower battery groups 1 and 2). The second busbar assembly 32 includes third and fourth busbars 321 and 322 arranged side by side. The third busbar 321 is arranged corresponding to the first busbar 314 and is used to connect the battery cells 4 of the upper battery group 1 in series, and the fourth busbar 322 is arranged corresponding to the second busbar 315 and is used to connect the battery cells 4 of the lower battery group 2 in series. This structure enables the upper and lower battery groups to independently realize the series connection of the battery cells 4, while realizing the connection between the two groups in the overall circuit through the series tab 313.

[0046] Through such a design, the total positive and negative poles of the battery module can be arranged at the same end of the module, thereby avoiding the drawbacks of the existing design that requires long soft connections to draw current from the other end. Long soft connections not only increase the internal resistance of the module, but also are prone to poor connection due to thermal effects or mechanical vibration during operation.

[0047] The positive and negative electrodes of each cell unit 4 in the lower battery pack 2 are arranged alternately, and the series connection is completed by the second bus bar 315 and the fourth bus bar 322. The second bus bar 315 is responsible for connecting one side of the electrodes of the cell units 4 in the lower battery pack 2, while the fourth bus bar 322 is responsible for connecting the other side of the electrodes, and the two work together to form the complete circuit of the lower battery pack 2. Such a design not only ensures efficient connection between the cell units 4, but also reduces wiring interference through the side-by-side arrangement of the bus bars.

[0048] The upper battery pack 1 is stacked on the lower battery pack 2 and is also composed of a plurality of cell units 4 stacked in sequence and arranged alternately with positive and negative electrodes. The cell units 4 in the upper battery pack 1 are connected in series by the first bus bar 314 and the third bus bar 321, wherein the first bus bar 314 connects one side of the electrodes of the cell units 4, and the third bus bar 321 connects the other side of the electrodes. Similar to the arrangement of the bus bars of the lower battery pack 2, this symmetrical design simplifies the wiring path, optimizes the circuit structure, and can improve the assembly efficiency and reliability of the battery module.

[0049] In an exemplary embodiment, referring to FIG. 1, Figures 1 to 5 the first bus bar 314 includes a plurality of spaced conductive sheets 5, each of which is used to connect the first side electrodes 41 (left side electrodes) of two adjacent cell units 4 in the upper battery pack 1. Figure 1 The second bus bar 315 includes a plurality of spaced conductive sheets 5, each of which is used to connect the first side electrodes 41 of two adjacent cell units 4 in the lower battery pack 2.

[0050] The first bus bar 314 is responsible for connecting the first side electrodes 41 of the cell units 4 in the upper battery pack 1. The spaced arrangement of the conductive sheets 5 on the bus bar is optimized based on the characteristics of the stacked arrangement of the cell units 4. The position and size of each conductive sheet 5 correspond to the first side electrodes 41 of the cell units 4 to ensure the reliability of the connection. Through the arrangement of the conductive sheets 5, the first bus bar 314 can connect the first side electrodes 41 of the cell units 4 in the upper battery pack 1 in pairs in series. At the same time, the spaced arrangement of the conductive sheets 5 can effectively reduce the electrical interference between the conductive sheets 5 and optimize the circuit performance.

[0051] The function and structure design of the second bus bar 315 are similar to those of the first bus bar 314, but it is mainly used to connect the first side electrodes 41 of the cell units 4 in the lower battery pack 2. The arrangement of the cell units 4 in the lower battery pack 2 corresponds to that of the upper battery pack 1, so the conductive sheets 5 of the second bus bar 315 are also spaced and correspond to the electrodes of the lower cell units 4. This correspondence ensures that each conductive sheet 5 can stably connect the first side electrodes 41 of adjacent cell units 4, thereby realizing the series connection of the first side electrodes 41 of the cell units 4 in the lower battery pack 2 in pairs.

[0052] Similarly, please refer to Figure 3 and Figure 5 As shown in FIG. 3B, the third bus bar 321 includes a plurality of conductive pieces 5 arranged at intervals, each of which is used to connect the second side electrode 42 (the right side electrode in the middle) of two adjacent battery cells 4 in the upper battery pack 1. Figure 1 The fourth bus bar 322 includes a plurality of conductive pieces 5 arranged at intervals, each of which is used to connect the second side electrode 42 of two adjacent battery cells 4 in the lower battery pack 2.

[0053] The main function of the third bus bar 321 is to connect the second side electrodes 42 of the battery cells 4 in the upper battery pack 1. The conductive pieces 5 of the third bus bar 321 are similar to the conductive pieces 5 of the first bus bar 314. Through the conductive pieces 5 of the first bus bar 314 and the third bus bar 321, the battery cells 4 in the upper battery pack 1 can be connected in series one by one.

[0054] The main function of the fourth bus bar 322 is to connect the second side electrodes 42 of the battery cells 4 in the lower battery pack 2. The conductive pieces 5 of the fourth bus bar 322 are similar to the conductive pieces 5 of the second bus bar 315. Through the conductive pieces 5 of the second bus bar 315 and the fourth bus bar 322, the battery cells 4 in the lower battery pack 2 can be connected in series one by one.

[0055] Specifically, as shown in FIG. 4, the conductive piece 5 includes a first connecting portion 51 and a second connecting portion 52, which are respectively used to electrically connect the same side electrodes of two adjacent battery cells 4 in the battery module. Figure 6

[0056] In the embodiment, each conductive piece 5 electrically connects the same side electrodes of two adjacent battery cells 4 in the battery module. In the conductive piece 5, the connecting portion electrically connected to the battery cell 4 located in the front position in the arrangement direction of the battery cells 4 is the first connecting portion 51, and the connecting portion electrically connected to the battery cell 4 located in the rear position in the arrangement direction of the battery cells 4 is the second connecting portion 52. In other embodiments, the positions of the first connecting portion 51 and the second connecting portion 52 can be interchanged, i.e., in the conductive piece 5, the connecting portion in the front position is the second connecting portion 52, and the connecting portion in the rear position is the first connecting portion 51.

[0057] The main function of the first connecting portion 51 is to connect with the electrode of a battery cell 4. Its shape, size, and material selection can be matched with the electrode structure of the battery cell 4 according to actual needs. Through the first connecting portion 51, the current of the battery cell 4 can be stably conducted to the conductive piece 5.

[0058] ​The second connecting part 52 complements the first connecting part 51 and is used to connect the electrodes on the same side of adjacent battery cell units 4. The position and orientation design of the second connecting part 52 needs to take into account the stacking arrangement characteristics of the battery cell units 4 in the module to ensure that adjacent battery cell units 4 can form a series relationship through the conductive sheet 5.

[0059] Further, please refer to Figure 2 and Figure 3 As shown, the first connecting portion 51 of the first conductive piece (which can be any conductive piece 5 in the first busbar 314) and the second connecting portion 52 of a conductive piece 5 in the third busbar 321 are respectively connected to the two poles of the same battery cell 4; the second connecting portion 52 of the first conductive piece 5 in the first busbar 314 and the first connecting portion 51 of another conductive piece 5 in the third busbar 321 are respectively connected to the two poles of an adjacent battery cell 4. The first connecting portion 51 of the second conductive piece (which can be any conductive piece 5 in the second busbar 315) in the second busbar 315 and the second connecting portion 52 of a conductive piece 5 in the fourth busbar 322 are respectively connected to the two poles of the same battery cell 4; the second connecting portion 52 of the second conductive piece 5 in the second busbar 315 and the first connecting portion 51 of another conductive piece 5 in the fourth busbar 322 are respectively connected to the two poles of an adjacent battery cell 4.

[0060] Specifically, the conductive piece 5 of the first busbar 314 is responsible for connecting to one electrode of the cell unit 4 in the upper battery pack 1. For example, the first connecting portion 51 of the conductive piece 5 is used to connect to the positive electrode of a cell unit 4, while the corresponding conductive piece 5 in the third busbar 321 is connected to the negative electrode of the same cell unit 4 through the second connecting portion 52, thereby completing the connection between the two electrodes of the cell unit 4. At the same time, the second connecting portion 52 of the conductive piece 5 of the first busbar 314 is connected to the negative electrode of the adjacent cell unit 4, and the first connecting portion 51 of another conductive piece 5 in the third busbar 321 is connected to the positive electrode of the adjacent cell unit 4. This alternating series connection allows each cell unit 4 to be connected sequentially to form a stable current path.

[0061] The series connection logic of the lower battery pack 2 is similar to that of the upper pack. The conductive piece 5 of the second busbar 315 is connected to the positive terminal of a cell unit 4 through the first connection part 51, while the conductive piece 5 of the fourth busbar 322 is connected to the negative terminal of the same cell unit 4 through the second connection part 52, thereby completing the two-terminal connection of the lower cell unit 4. Similarly, the second connection part 52 of the conductive piece 5 of the second busbar 315 is connected to the negative terminal of the adjacent cell unit 4, and the first connection part 51 of the other conductive piece 5 of the fourth busbar 322 is connected to the positive terminal of the adjacent cell unit 4.

[0062] The positive and negative poles of the battery cell 4 in the lower battery group 2 are located on both sides of the battery cell 4, and the positive and negative poles of adjacent battery cells 4 face each other in compliance with the principle of alternating arrangement. That is, the positive and negative poles of any two adjacent battery cells 4 are opposite in direction. Such a design can naturally correspond the first and second connecting parts 51 and 52 of the same conductive sheet 5 in the busbar to different poles of adjacent battery cells 4, simplifying the connection logic between the conductive sheet 5 and the battery cell 4. At the same time, the alternating polarity direction can effectively avoid the cross interference that may occur in the current path, making the conduction of current more efficient and stable. This structural layout enables the second busbar 315 and the fourth busbar 322 to sequentially connect all the battery cells 4 in the lower battery group 2 in the shortest path, optimizing the circuit structure and reducing electrical loss.

[0063] The arrangement of the battery cell 4 in the upper battery group 1 is similar to that of the lower battery group 2, and also adopts the design of alternating positive and negative poles. The positive and negative poles of each battery cell 4 are located on both sides, and the positive and negative poles of adjacent cells are opposite in direction. This symmetrical layout enables the first busbar 314 and the third busbar 321 to complete the series connection of the upper battery group 1, while maintaining similar circuit logic as the lower battery group 2. This consistency not only simplifies the design and processing technology of the conductive sheet 5, but also improves the assembly efficiency of the entire module.

[0064] Due to the alternating arrangement of the positive and negative poles of the battery cell 4 in the battery group, the first and second connecting parts 51 and 52 of the conductive sheet 5 can naturally connect different poles of adjacent battery cells 4, achieving stable electrical series connection. Through the cooperation of the first busbar 314 and the third busbar 321, the battery cells 4 in the upper battery group 1 can be connected one by one; similarly, the second busbar 315 and the fourth busbar 322 can also perform similar functions in the lower battery group 2. The alternating polarity design also reduces the wiring interference that may occur between the busbars, making the circuit more simple and efficient.

[0065] Please refer to Figure 7 and Figure 8As shown in the figure, the first connecting part 51a of the first conductive sheet 5a in the first bus bar 314 is connected to the positive electrode 41a of the upper-layer battery cell unit 4a, and the second connecting part 52b of a conductive sheet 5b in the corresponding third bus bar 321 is connected to the negative electrode 42a of the battery cell unit 4a; at the same time, the second connecting part 52a of the first conductive sheet 5a is connected to the negative electrode 42b of the adjacent battery cell unit 4b, and the first connecting part 51c of another conductive sheet 5c in the third bus bar 321 is connected to the positive electrode 41b of the battery cell unit 4b. Through this alternating connection mode, the series connection between the battery cell units 4 can be realized, while avoiding the crossing and confusion of the current path. Similarly, the conductive sheets 5 in the second bus bar 315 and the fourth bus bar 322 are connected to the lower-layer battery cell units 4 in a similar manner, which will not be described here.

[0066] The advantage of this design is that it makes full use of the relationship between the first connecting part 51 and the second connecting part 52 of the conductive sheet 5, and realizes the efficient connection of the positive and negative electrodes of the battery cell units 4 through the corresponding arrangement between different bus bars. On the one hand, both ends of each conductive sheet 5 can undertake the connection task of different battery cell units 4, saving materials and space; on the other hand, this alternating connection mode can effectively balance the distribution of current, reduce the local resistance in the circuit, and improve the energy transmission efficiency of the entire battery module.

[0067] In an exemplary embodiment, please refer to Figure 6 As shown in the figure, the conductive sheet 5 is provided with a buffer part 53, which is arched away from the connecting surface of the conductive sheet 5 and the battery cell unit 4. The buffer part 53 is located between the first connecting part 51 and the second connecting part 52.

[0068] The design of the buffer part 53 is based on the consideration that the battery cell unit 4 may be deformed during operation. Since the battery is affected by current, heat and mechanical stress during charging and discharging cycle, its volume may change slightly, and if this change is directly transmitted to the connecting part of the conductive sheet 5, it may cause welding fatigue or even fall off of the connecting point. The buffer part 53 provides a certain elastic buffer space for the conductive sheet 5 through its arched structure, which can effectively absorb and disperse the stress caused by the deformation, thereby protecting the welding points between the first connecting part 51 and the second connecting part 52 and the battery cell unit 4.

[0069] The arching direction of the buffer portion 53 is away from the connecting surface of the battery cell unit 4, which ensures that the buffer portion 53 does not directly interfere with the electrode or the connecting part of the conductive sheet 5 of the battery cell unit 4, and at the same time can provide sufficient elastic support when deformation occurs. The buffer portion 53 is located between the first connecting portion 51 and the second connecting portion 52, which does not affect the direct connection between the conductive sheet 5 and the battery cell unit 4, and can form a stable mechanical support between the two end connecting portions, uniformly distribute the stress, thereby avoiding the fracture of the connecting point due to concentrated stress.

[0070] Specifically, please refer to Figure 6 As shown in the figure, the first connecting portion 51 and the second connecting portion 52 are provided with through welding holes 54 corresponding to the electrode position of the battery cell unit 4. The position of the welding hole 54 is designed to correspond to the position of the electrode of the battery cell unit 4, which ensures that the welding material can be uniformly distributed to the contact surface between the connecting portion and the electrode during the welding process. The welding hole 54 not only can improve the welding efficiency, but also can significantly improve the uniformity and firmness of the welding point, and avoid the connection quality problem caused by welding misplacement or uneven distribution of materials.

[0071] The through structure of the welding hole 54 plays an auxiliary role in the transmission of welding heat energy. During the welding process, the welding hole 54 can guide the welding heat energy to act on the contact area between the electrode and the connecting portion of the battery cell unit 4, thereby improving the heat utilization rate and avoiding the phenomenon of insecure welding caused by insufficient heat energy. At the same time, the existence of the welding hole 54 helps to reduce the thermal resistance of the connecting portion as a whole, so that the welding heat can be quickly and uniformly transmitted to the entire connecting area, thereby further improving the connection strength of the welding point.

[0072] In an exemplary embodiment, please refer to Figure 2 and Figure 4 As shown in the figure, the first bus assembly 31 further comprises a first isolation plate 6, the front end of the first isolation plate 6 is provided with a first accommodation groove 61 for accommodating the positive sheet 311 and the negative sheet 312, the rear end of the first isolation plate 6 is provided with a second accommodation groove 62 for accommodating the series sheet 313, and the first accommodation groove 61 and the second accommodation groove 62 are provided with a third accommodation groove 63 for accommodating the first bus bar 314 and the second bus bar 315. The first isolation plate 6 provides stable structural support for the positive sheet 311, the negative sheet 312, the series sheet 313, and the first bus bar 314 and the second bus bar 315.

[0073] The position and shape of the first receiving groove 61 match the size and arrangement of the positive plate 311 and the negative plate 312, ensuring that the output interface of the battery module positive and negative can be connected with the external circuit in the shortest path. This design not only reduces the complexity of wiring, but also significantly reduces the power loss that may be caused by unstable connection. At the same time, the structure of the first receiving groove 61 provides mechanical limiting for the positive plate 311 and the negative plate 312, avoiding position deviation caused by external force during assembly or operation.

[0074] The second receiving groove 62 provides fixed support for the series plate 313, preventing it from shifting during assembly or operation. At the same time, the design of the second receiving groove 62 also considers the electrical insulation requirements, ensuring that the spacing between the series plate 313 and the surrounding components can effectively prevent short circuit or electrical interference.

[0075] As the main path to connect the upper and lower battery pack 2 cell units 4, the first bus bar 314 and the second bus bar 315 realize the series connection of the cell units 4 through the spaced conductive plates 5. The design of the third receiving groove 63 considers the size of the bus bar and the arrangement of the conductive plates 5, providing a stable fixing platform for them, while ensuring that the functional area of the conductive plates 5 is not affected by external factors. The third receiving groove 63 also provides positioning for the spacing arrangement between the conductive plates 5, avoiding the performance degradation of the circuit caused by installation errors.

[0076] The overall design of the first isolation plate 6 realizes the orderly arrangement of the positive plate 311, the negative plate 312, the series plate 313 and the bus bar through the partition layout of the front, middle and rear receiving grooves. Each receiving groove not only provides independent receiving space for these components, but also ensures the electrical connection and mechanical stability of the module through its internal partition and insulation function.

[0077] Similarly, please refer to Figure 3 and Figure 5 As shown, the second bus assembly 32 also includes a second isolation plate 7, which is provided with a fourth receiving groove 71 for receiving the third bus bar 321 and the fourth bus bar 322, and the fourth receiving groove 71 is correspondingly arranged to the third receiving groove 63.

[0078] The third bus bar 321 and the fourth bus bar 322 are respectively responsible for the series connection of the second side electrodes 42 of adjacent cell units 4 in the upper and lower battery packs 2, and their function is related to the stability of the electrical performance of the module. The arrangement position of the fourth receiving groove 71 corresponds to the third receiving groove 63 in the first bus assembly 31, and this design makes the bus assembly form precise alignment in structure.

[0079] Specifically, the first and second isolation plates 6 and 7 are made of plastic, and the positive plate 311, the negative plate 312, the series plate 313, the first bus bar 314, and the second bus bar 315 are fixed on the first isolation plate 6 by hot melting, and the third bus bar 321 and the fourth bus bar 322 are fixed on the second isolation plate 7 by hot melting.

[0080] The first and second isolation plates 6 and 7 are preferably made of high-performance plastic, which not only has good mechanical strength and electrical insulation performance, but also can realize the fixation of components through the hot melting process. The lightweight characteristics of plastic material help to reduce the overall weight of the module, and its molding process facilitates the manufacture of complex geometric structures of the isolation plate, providing greater flexibility for the design of each receiving groove and fixed part.

[0081] On the first isolation plate 6, the positive plate 311, the negative plate 312, the series plate 313, and the conductive plates 5 of the first and second bus bars 314 and 315 are fixed in designated positions by hot melting. This fixing method not only can complete the firm connection in a short time, but also avoids the loosening problem that may occur in the traditional mechanical fixing method. The components after hot melting are integrated with the isolation plate, ensuring their stability in high temperature or vibration environment, thereby improving the operation reliability of the module.

[0082] The conductive plates 5 of the third and fourth bus bars 321 and 322 on the second isolation plate 7 are also fixed in corresponding positions by hot melting. This fixing method can maintain the precise position of the conductive plates 5 while providing good anti-vibration performance and durability, especially under high-power output conditions, it can effectively reduce the risk of connection failure caused by thermal expansion and contraction or external vibration. In addition, the connection interface formed by the hot melting process can further enhance the contact area between the bus bar and the isolation plate, improving the overall mechanical strength and impact resistance.

[0083] In an exemplary embodiment, please refer to Figure 4 and Figure 5 It is shown that the third receiving groove 63 includes a plurality of first receiving parts 631 arranged at intervals, and a first isolation part 632 is protruded between two adjacent first receiving parts 631. The fourth receiving groove 71 includes a plurality of second receiving parts 711 arranged at intervals, and a second isolation part 712 is protruded between two adjacent second receiving parts 711.

[0084] The third and fourth receiving grooves 63 and 71 are subdivided into a plurality of receiving parts arranged at intervals, and the adjacent conductive plates 5 are electrically isolated by the protruded isolation parts. This design not only makes full use of space, but also effectively improves the fixing accuracy of the conductive plates 5 and the electrical stability of the module.

[0085] The first accommodating part 631 in the third accommodating groove 63 is arranged in intervals, and each accommodating part can accommodate one conductive sheet 5, thereby providing independent and stable physical support for the conductive sheet 5. The size and shape of the first accommodating part 631 match the specifications of the conductive sheet 5, ensuring that the conductive sheet 5 can be accurately fixed in the designated position, while preventing displacement during assembly or operation. The first isolation part 632 is arranged between adjacent first accommodating parts 631, and the first isolation part 632 is formed in a protruding form, and its main function is to limit and electrically isolate adjacent conductive sheets 5, thereby avoiding short circuit problems caused by contact or interference of the conductive sheets 5.

[0086] The fourth accommodating groove 71 has a similar design logic as the third accommodating groove 63, and a plurality of second accommodating parts 711 are arranged in intervals inside the fourth accommodating groove 71, and each accommodating part can accommodate one conductive sheet 5 for fixing the conductive sheet 5 in the second bus assembly 32. Similarly, the second isolation part 712 is arranged between the second accommodating parts 711, and the protruding isolation part provides effective electrical insulation for adjacent conductive sheets 5. This design ensures that the busbar can stably maintain its electrical function during operation, while providing convenience for independent operation and maintenance of the conductive sheet 5.

[0087] In an exemplary embodiment, as shown in Figure 4 and Figure 5 , the first isolation plate 6 is provided with a plurality of first connection through holes 64 corresponding to the electrodes of the battery cell unit 4 in the battery module. The second isolation plate 7 is provided with a plurality of second connection through holes 72 corresponding to the electrodes of the battery cell unit 4 in the battery module.

[0088] The position and size of the first connection through hole 64 on the first isolation plate 6 match the distribution of the first side electrode 41 of the battery cell unit 4 in the battery module. The first connection through hole 64 provides a direct connection path for the first side electrode of the battery cell unit 4 to the positive sheet 311, the negative sheet 312, the series sheet 313, and the first busbar 314 and the second busbar 315, ensuring that the current of the battery cell unit 4 can be smoothly transmitted to each functional component. The first connection through hole 64 not only provides a channel for the conductive sheet 5 in a physical way, but also plays an accurate positioning role in the electrical connection process, avoiding problems such as poor contact or connection failure caused by deviation.

[0089] The second connection through hole 72 on the second isolation plate 7 has the same design logic as the first connection through hole 64, and its function is to provide a direct connection channel for the second side electrode of the battery cell unit 4 in the battery module. The position of the second connection through hole 72 corresponds to the electrode distribution of the lower layer battery cell unit 4, so that the electrode of the battery cell unit 4 can be quickly and accurately docked with the conductive sheet 5 of the busbar.

[0090] In an exemplary embodiment, as shown in Figures 1 to 5As shown, the first busbar assembly 31 further comprises a first collection wire harness 316 connected with the positive electrode sheet 311, the negative electrode sheet 312, the series sheet 313, the first busbar 314 and the second busbar 315, and the first collection wire harness 316 comprises temperature collection lines, voltage collection lines and connectors 33 for connecting the battery management unit. The second busbar assembly 32 further comprises a second collection wire harness 323 connected with the third busbar 321 and the fourth busbar 322, and the second collection wire harness 323 comprises temperature collection lines, voltage collection lines and connectors 33 for connecting the battery management unit.

[0091] The first collection wire harness 316 is connected with the positive electrode sheet 311, the negative electrode sheet 312, the series sheet 313, the first busbar 314 and the second busbar 315 in the first busbar assembly 31. Through the temperature collection lines and the voltage collection lines, accurate temperature and voltage monitoring of each battery cell unit 4 in the busbar assembly can be performed. The temperature collection lines collect the running temperature of the battery cell unit 4 in real time, can quickly respond to the temperature rise caused by charging and discharging, and thus provide accurate thermal management data for the battery management unit; the voltage collection lines measure the voltage change of each battery cell unit 4 in real time, and ensure the balance and working stability of each battery cell unit 4 in the module. The connectors 33 serve as the interface for data transmission, and can be connected with the battery management unit 8 (BMU) through standardized design, so as to quickly transmit the collected temperature and voltage data to the battery management unit 8, and realize real-time monitoring of the running state of the module.

[0092] The second collection wire harness 323 is connected with the third busbar 321 and the fourth busbar 322 in the second busbar assembly 32, and has similar functions to the first collection wire harness 316, and is mainly responsible for the state data collection of the battery cell unit 4. Through the temperature collection lines and the voltage collection lines, the running state of the battery pack can be comprehensively monitored, and the working state of the battery pack can be ensured to form a unified management model in the BMU.

[0093] In summary, the integrated busbar and the battery module provided by the present application have the following technical effects:

[0094] (1) The double-layer layout of the first busbar assembly and the second busbar assembly is adopted, which effectively avoids the problem that the current needs to be led out through a long soft connection in the traditional single-layer busbar, reduces the internal resistance of the module, and thus improves the energy transmission efficiency and the overall battery performance;

[0095] (2) The first busbar assembly and the second busbar assembly are respectively fixed on independent isolation plates, and precise receiving grooves and connecting through holes are designed in the isolation plates, so that the compact arrangement and stable fixation of the functional components are realized;

[0096] (3) The conductive sheets are positioned by being arranged at intervals and received by the receiving portions, and are precisely connected with the electrodes of the battery cell units, which simplifies the assembly process and improves the reliability of the electrical connection.

[0097] (4) The combination of the electrical insulation properties of the spacer plate and the hot-melt fixing process ensures the mechanical strength and long-term stability of the module.

[0098] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in a descriptive sense only and not for purposes of limitation. The scope of the present application is defined by the appended claims rather than the foregoing description, and all changes that come within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference numerals in the claims are intended to correspond to structures in the description and are meant to be non-limiting.

[0099] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description is made in this way only for the sake of clarity, and those skilled in the art should consider the description as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. An integrated busbar for connecting a battery module, characterized by, The integrated busbar comprises: The first bus assembly comprises a positive plate, a negative plate, a series plate, and a first busbar and a second busbar arranged side by side, the positive plate is arranged on the front side of the first busbar, the negative plate is arranged on the front side of the second busbar, and the series plate is arranged on the back side of the first busbar and the second busbar; The second bus assembly comprises a third busbar and a fourth busbar arranged side by side, the third busbar is provided corresponding to the first busbar, and the fourth busbar is provided corresponding to the second busbar; The first busbar and the third busbar are used to connect the cell units of the upper layer battery pack of the battery module, the second busbar and the fourth busbar are used to connect the cell units of the lower layer battery pack of the battery module, and the series plate is used to connect the upper layer battery pack and the lower layer battery pack in series.

2. The integrated busbar of claim 1, wherein, The first busbar comprises a plurality of spaced conductive plates, each conductive plate is used to connect the first side electrode of two adjacent cell units in the upper layer battery pack; the second busbar comprises a plurality of spaced conductive plates, each conductive plate is used to connect the first side electrode of two adjacent cell units in the lower layer battery pack.

3. The integrated busbar of claim 2, wherein, The third busbar comprises a plurality of spaced conductive plates, each conductive plate is used to connect the second side electrode of two adjacent cell units in the upper layer battery pack; the fourth busbar comprises a plurality of spaced conductive plates, each conductive plate is used to connect the second side electrode of two adjacent cell units in the lower layer battery pack.

4. The integrated busbar of claim 3, wherein, The conductive plate comprises a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are respectively used to electrically connect the same side electrode of two adjacent cell units in the battery module.

5. The integrated busbar of claim 4, wherein, The first connecting portion of the first conductive plate in the first busbar and the second connecting portion of the conductive plate in the third busbar are respectively connected to the two poles of the same cell unit; the second connecting portion of the first conductive plate in the first busbar and the first connecting portion of the other conductive plate in the third busbar are respectively connected to the two poles of the adjacent other cell unit; and / or The first connecting portion of the second conductive plate in the second busbar and the second connecting portion of the conductive plate in the fourth busbar are respectively connected to the two poles of the same cell unit; the second connecting portion of the second conductive plate in the second busbar and the first connecting portion of the other conductive plate in the fourth busbar are respectively connected to the two poles of the adjacent other cell unit.

6. The integrated busbar of claim 4, wherein, The conductive plate is provided with a buffer portion, the buffer portion is arched away from the connecting surface of the conductive plate and the cell unit, and the buffer portion is located between the first connecting portion and the second connecting portion.

7. The integrated busbar of claim 4, wherein, The first connecting portion and the second connecting portion are provided with a through welding hole corresponding to the position of the electrode of the cell unit.

8. The integrated busbar of claim 1, wherein, The first bus assembly further comprises a first isolation plate, the front end of the first isolation plate is provided with a first accommodation groove for accommodating the positive plate and the negative plate, the rear end of the first isolation plate is provided with a second accommodation groove for accommodating the series plate, and the first accommodation groove and the second accommodation groove are provided with a third accommodation groove for accommodating the first busbar and the second busbar.

9. The integrated busbar of claim 8, wherein, The second bus assembly further comprises a second isolation plate, and the second isolation plate is provided with a fourth accommodation groove for accommodating the third bus and the fourth bus.

10. The integrated busbar of claim 9, wherein, The first isolation plate and the second isolation plate are made of plastic, and the positive plate, the negative plate, the series connection plate, the first bus and the second bus are fixed on the first isolation plate by a hot melting method, and the third bus and the fourth bus are fixed on the second isolation plate by a hot melting method.

11. The integrated busbar of claim 9, wherein, The third accommodation groove comprises a plurality of first accommodation portions arranged at intervals, and a first isolation portion is protruding between two adjacent first accommodation portions; and / or The fourth accommodation groove comprises a plurality of second accommodation portions arranged at intervals, and a second isolation portion is protruding between two adjacent second accommodation portions.

12. The integrated busbar of claim 9, wherein, The first isolation plate is provided with a plurality of first connection through holes corresponding to the electrodes of the battery cell units in the battery module; and / or The second isolation plate is provided with a plurality of second connection through holes corresponding to the electrodes of the battery cell units in the battery module.

13. The integrated busbar of claim 1, wherein, The first bus assembly further comprises a first collection wire harness connected with the positive plate, the negative plate, the series connection plate, the first bus and the second bus, and the first collection wire harness comprises a temperature collection wire, a voltage collection wire and a connector for connecting a battery management unit; and / or The second bus assembly further comprises a second collection wire harness connected with the third bus and the fourth bus, and the second collection wire harness comprises a temperature collection wire, a voltage collection wire and a connector for connecting a battery management unit. Comprise:

14. A battery module, characterized by A lower battery pack comprising a plurality of battery cell units arranged in a stack; An upper battery pack stacked on the lower battery pack, the upper battery pack comprising a plurality of battery cell units arranged in a stack; The integrated bus bar of any one of claims 1-13, the first bus bar and the third bus bar of the integrated bus bar are connected in series with the battery cell units of the upper battery pack, the second bus bar and the fourth bus bar are connected in series with the battery cell units of the lower battery pack, the series connection plate is connected in series with the upper battery pack and the lower battery pack, the positive plate is connected with the total positive electrode of the upper battery pack and the lower battery pack, and the negative plate is connected with the total negative electrode of the upper battery pack and the lower battery pack. The positive electrode and the negative electrode of each battery cell unit in the lower battery pack are located on both sides of the battery cell unit, and the positive electrode and the negative electrode of any two adjacent battery cell units face in opposite directions; and / or 15. The battery module of claim 14, wherein, The positive electrode and the negative electrode of each battery cell unit in the upper battery pack are located on both sides of the battery cell unit, and the positive electrode and the negative electrode of any two adjacent battery cell units face in opposite directions. ​

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