Integrated busbar, battery pack and vehicle

Abstract

The embodiment of the invention relates to the technical field of new energy vehicles, and discloses an integrated busbar, a battery pack and a vehicle, the integrated busbar comprises a confluence connecting bar assembly and a sampling line assembly, the sampling line assembly comprises an acquisition circuit board and a plurality of conducting strips, the acquisition circuit board comprises a main body part and a folding part, and the main body part comprises a plurality of conducting strips. The acquisition circuit board is folded along a first folding line and forms the main body part and the folding part which are oppositely arranged; the length directions of the acquisition circuit board and the first folding line are both along a first direction, and the sampling line assembly is connected with the confluence connecting bar assembly through the plurality of conducting strips. By applying the technical scheme of the invention, the space utilization rate of the battery pack can be ensured, and the temperature rise requirement of the confluence connecting bar assembly under large current and the line number requirement and the line width requirement of the sampling line assembly can be met.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, specifically to an integrated busbar, battery pack, and vehicle. Background Technology

[0002] Integrated busbars, also known as Cell Contact Systems (CCS), integrate components such as busbar assemblies and sampling line assemblies in a battery pack into a single module. This enables high-voltage series and parallel connection of cells, temperature and voltage sampling, and overcurrent protection, providing temperature and voltage data to the Battery Management System (BMS). It is a crucial component of the battery pack. Busbar assemblies carry current, while sampling line assemblies transmit signals. With the increasing mileage and lightweighting of automobiles, more cells need to be housed within the same battery pack space. This increases the installation space required for both busbar assemblies and sampling line assemblies, making it difficult for existing battery pack layouts to simultaneously meet the installation space requirements of both. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide an integrated busbar, battery pack and vehicle, which aims to ensure the space utilization of the battery pack and meet the temperature rise requirements of the busbar assembly under high current, as well as the requirements for the number and width of the sampling line assembly.

[0004] In a first aspect, embodiments of this application provide an integrated busbar, including a busbar assembly and a sampling line assembly. The sampling line assembly includes a data acquisition circuit board and multiple conductive sheets. The data acquisition circuit board includes a main body and a folded portion. The data acquisition circuit board is folded along a first fold line to form the main body and the folded portion facing each other. The length direction of the data acquisition circuit board and the first fold line is along a first direction. The sampling line assembly and the busbar assembly are connected through the multiple conductive sheets. The data acquisition circuit board can be a flexible printed circuit (FPC), and the conductive sheets can be nickel sheets or other conductive metal sheets.

[0005] This design, by overlapping the folded portion with the main body, reduces the width of the sampling line assembly, thereby reducing its installation space occupancy. This frees up more space for the adjacent busbar assembly, allowing it to be designed as thinner and wider. As a current-carrying component, a thinner and wider busbar assembly ensures its temperature rise performance under high current and increases its heat dissipation area, further optimizing its temperature rise performance. By improving the structure of the busbar assembly and sampling line assembly, the design achieves the desired temperature rise under high current for the busbar assembly and meets the requirements for the number and width of lines in the sampling line assembly, while maintaining efficient space utilization in the battery pack. This allows for the integration of more battery cells within a limited space. Furthermore, the folding design eliminates the need for modifications to the circuit board manufacturing process. Compared to traditional double-sided or multi-layer circuit boards, this application reduces production costs and facilitates standardization.

[0006] In one possible embodiment, some of the conductive sheets are spaced apart along a first direction on the side of the main body away from the first fold line, and the remaining conductive sheets are spaced apart along the first direction on the side of the folded portion near the first fold line.

[0007] With this configuration, the busbar assembly has inter-cell connection bars on both sides of the corresponding sampling line assembly. The lines connecting to the inter-cell connection bars on both sides are respectively located on the main body and the folded part, allowing for a more rational distribution of the lines. The width of the folded part in the second direction can be smaller than the width of the main body in the second direction, thus exposing the side of the main body away from the first fold line, facilitating the installation of conductive sheets. The second direction is perpendicular to the first direction.

[0008] In one possible embodiment, the integrated busbar further includes an integrated component with a receiving groove and a supporting plane. The receiving groove has a pole connection through hole inside. The busbar assembly is connected to the receiving groove, and the sampling line assembly is connected to the supporting plane. Specifically, both the receiving groove and the supporting plane have multiple positioning posts, and both the busbar assembly and the sampling line assembly have positioning holes. The connection and positioning of the two components are achieved by inserting the positioning posts into the positioning holes.

[0009] This design integrates the busbar assembly and sampling line assembly into a single unit for production, transportation, and assembly. Pre-drilled through-holes in the receiving slot facilitate welding of the busbar assembly to the battery cell terminals at these through-holes.

[0010] In one possible embodiment, the sampling line assembly further includes a mounting reinforcement plate, a connector, and a mounting bracket. One end of the acquisition circuit board extends from the integrated component and forms a bent structure. The mounting reinforcement plate and the connector are both connected to the bent structure. The connection between the connector and the bent structure of the acquisition circuit board can be achieved through welding, crimping, or gold finger insertion.

[0011] This design allows the bending structure, mounting reinforcement plates, connectors, and mounting brackets to be located on the outside of the integrated component. The dimensions of the mounting reinforcement plates and connectors are no longer limited by the space occupied by the busbar assembly, enabling the use of different sizes and shapes of mounting reinforcement plates and connectors to meet the needs of different battery packs. The beam inside the battery housing has mating grooves for connecting to the mounting brackets. Connecting the mounting brackets to these grooves increases the installation stability of the sampling line assembly. Furthermore, integrating the mounting brackets into the sampling line assembly reduces the number of parts during assembly and improves assembly efficiency.

[0012] In one possible embodiment, the sampling line assembly further includes multiple temperature acquisition components, each including a temperature-sensing reinforcement plate, a sampling line branch, and a temperature sensor. The temperature-sensing reinforcement plate and the temperature sensor are respectively disposed on different sides of the sampling line branch. A clamping gap is formed between the busbar assembly and the integrated component. The temperature-sensing reinforcement plate and the sampling line branch are inserted into the clamping gap, and the sampling line branch is connected to the acquisition circuit board. The temperature sensor can be a negative temperature coefficient thermistor (NTC thermistor). This configuration uses the busbar assembly and integrated components to clamp and position the temperature sensing reinforcement plate and sampling line branches, ensuring the stability of the temperature acquisition components. Furthermore, it eliminates the need for other positioning structures, thus reducing the structural complexity of the integrated busbar.

[0013] In one possible embodiment, the temperature acquisition component further includes a protective block disposed on the side of the sampling line branch facing the temperature sensor; a clearance cavity is formed in the middle of the protective block, and the temperature sensor is located in the clearance cavity; a snap-fit ​​groove is provided on the busbar assembly, and the outside of the protective block is connected to the snap-fit ​​groove.

[0014] This configuration, with a protective block surrounding the temperature sensor and the protective block engaging with the slot of the busbar assembly, further ensures the limiting effect on the temperature acquisition component and guarantees its stability.

[0015] In one possible embodiment, the busbar assembly includes multiple inter-cell connection bars, each of which includes a first connection portion, a second connection portion, and a buffer portion. The first connection portion and the second connection portion are respectively disposed on different sides of the buffer portion. The buffer portion is U-shaped, wavy, or folded.

[0016] The first and second connecting portions are used for welding connections with two different cell terminals. The battery pack includes multiple cell groups arranged side-by-side along a second direction. Each cell group includes multiple cells arranged sequentially along a first direction. Inter-cell connecting blocks are used to connect adjacent cells in the same cell group in series or parallel. Both the first and second connecting portions are provided with positioning holes for connection to the positioning posts of the busbar assembly.

[0017] The U-shaped buffer section refers to a U-shaped groove or U-shaped protrusion structure formed between the first and second connecting parts. The deformation of this U-shaped groove or protrusion under pressure absorbs displacement caused by cell expansion and vibration. The wavy buffer section refers to a wavy structure with alternating grooves and protrusions between the first and second connecting parts. The deformation of these grooves and protrusions under pressure absorbs displacement caused by cell expansion and vibration. The folded buffer section refers to a folded spring structure added to the U-shaped groove buffer section. A gap exists between the spring structure and the U-shaped groove, allowing for some movement and enabling the spring structure and the U-shaped groove to absorb displacement caused by cell expansion and vibration through deformation. The folded spring structure only folds the portion outside the welding area of ​​the cell connection bar, reducing the need for additional thinning or machining processes in the welding area, thus lowering costs. The welding area refers to the area where the first and second connecting parts are welded to the cell terminals.

[0018] This design, by absorbing the displacement caused by cell expansion and vibration through the deformation of the buffer section, can reduce the risk of cell electrode failure due to stress deformation under various operating conditions.

[0019] In one possible embodiment, the busbar assembly further includes at least one cell group bridging busbar component. Each cell group bridging busbar component includes a bridging busbar body and two adapter plates. The bridging busbar body includes a third connecting portion, a fourth connecting portion, and a bridging portion. The third connecting portion and the fourth connecting portion are respectively disposed on different sides of the bridging portion. An adapter plate is respectively disposed between the third connecting portion and the fourth connecting portion and the integrated component. A positioning portion is disposed on the adapter plate. A positioning mating portion is disposed on both the third connecting portion and the fourth connecting portion. The positioning portion is connected to the positioning mating portion.

[0020] The cell-to-cell connecting busbar, the bridging connecting busbar body, and the adapter plate can all be made of aluminum. The battery pack includes multiple cell groups arranged side-by-side along a second direction. Each cell group includes multiple cells arranged sequentially along a first direction. The cell group bridging connecting busbar is used to realize series and parallel connections between adjacent cell groups. The thickness of the adapter plate is less than the thickness of the first connecting part and the thickness of the second connecting part.

[0021] The positioning part on the adapter piece can be a positioning boss or a snap-fit ​​block. The positioning mating parts on the third and fourth connecting parts are positioning grooves that mate with the positioning boss or snap-fit ​​holes that mate with the snap-fit ​​block. The adapter piece, the third connecting part, and the fourth connecting part are all provided with positioning holes that connect to the positioning posts of the busbar assembly. The bridging part is located outside the integrated component and can abut against the beam inside the battery casing outside the cell pack via foam.

[0022] With this configuration, both the adapter piece and the bridging connector body are connected to the busbar assembly, and there is also a positioning and mating structure between the adapter piece and the bridging connector body, which can realize the bridging connection of the separate cell group. During assembly, the adapter piece is first connected to the sampling line assembly through a conductive sheet. During battery assembly, the adapter piece and the bridging connector body are then welded to the cell terminal. This can prevent the bridging part located outside the integrated component from increasing the space requirements of the integrated busbar process tooling and transport tray.

[0023] Secondly, this application provides a battery pack, including a battery casing, multiple cell groups, and the aforementioned integrated busbar. The battery casing encloses an accommodating space, and the multiple cell groups and the integrated busbar are all located inside the battery casing. The battery pack includes multiple cell groups arranged side by side along a second direction, and each cell group includes multiple cells arranged sequentially along a first direction. The multiple cell groups are all connected to the integrated busbar. The cell-to-cell connection bar of the integrated busbar is used to realize the series-parallel connection of two adjacent cells in the same cell group, and the cell-to-cell bridging connection bar of the integrated busbar is used to realize the series-parallel connection between two adjacent cell groups.

[0024] Thirdly, this application provides a vehicle including a vehicle body and the aforementioned battery pack, the battery pack being disposed at the bottom of the vehicle body.

[0025] The beneficial effects of this application are as follows: By overlapping the folded portion with the main body, the width of the sampling line assembly can be reduced, thereby reducing the installation space occupancy rate of the sampling line assembly. This frees up more space for the busbar assembly adjacent to the sampling line assembly, allowing the busbar assembly to be designed in a thinner and wider shape. This ensures that the temperature rise performance of the busbar assembly under high current meets the requirements, and also increases the heat dissipation area of ​​the busbar assembly, further optimizing its temperature rise performance. By improving the structure of the busbar assembly and the sampling line assembly, while ensuring the space utilization of the battery pack, the temperature rise requirements of the busbar assembly under high current and the requirements for the number and width of the sampling line assembly are met, thus enabling the integration of more battery cells within a limited space. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0027] Figure 1 This is an exploded structural diagram of the integrated busbar disclosed in an embodiment of this application; Figure 2 This is a partially enlarged view of the exploded structural schematic diagram of the integrated busbar disclosed in the embodiments of this application; Figure 3 This is a partially enlarged view of the structural schematic diagram of the integrated busbar disclosed in the embodiments of this application; Figure 4 This is a schematic diagram of the mating structure between the mounting bracket of the integrated busbar and the docking groove of the battery casing disclosed in the embodiments of this application; Figure 5 This is a partial enlarged view of the sampling line assembly disclosed in the embodiments of this application (connectors and mounting brackets are not shown). Figure 6 This is a partial enlarged view of the periphery of the temperature acquisition component of the sampling line assembly disclosed in the embodiments of this application (the shape of the protective block and the snap-fit ​​groove can be stepped). Figure 7 This is a partial enlarged view of the periphery of the temperature acquisition component of the sampling line assembly disclosed in the embodiments of this application (the protective block and the snap-fit ​​groove can be rectangular in shape). Figure 8 This is a schematic diagram of the inter-cell connection bar disclosed in an embodiment of this application (the buffer part is U-shaped). Figure 9 This is a schematic diagram of the structure of the cell connection bar disclosed in the embodiment of this application (the buffer part is wavy). Figure 10 This is a schematic diagram of the structure of the inter-cell connection bar disclosed in an embodiment of this application (the buffer part is folded). Figure 11 This is a schematic diagram of the structure of the battery pack bridging connector component disclosed in the embodiments of this application (the positioning part is a positioning boss). Figure 12 This is a schematic diagram of the structure of the cell pack bridging connector component disclosed in the embodiments of this application (the positioning part is a snap-fit ​​block). Figure 13 This is a schematic diagram of the battery pack structure disclosed in the embodiments of this application; Figure 14 This is a schematic diagram of the vehicle structure disclosed in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures: 1-Bus connector assembly, 11-Inter-cell connector, 111-First connector, 112-Second connector, 113-Buffer, 1131-U-shaped groove structure, 1132-Wave structure, 1133-Spring structure, 114-Snap-fit ​​groove, 12-Cell group bridging connector assembly, 121-Bridging connector body, 1211-Third connector, 1212-Fourth connector, 1213-Bridging part, 1214-Positioning mating part, 12141-Positioning groove, 12142-Snap-fit ​​hole, 122-Adapter piece, 1221-Positioning part, 12211-Positioning boss, 12212-Snap-fit ​​block; 2-Sampling line assembly, 21-Acquisition circuit board, 211-Main body, 212-Folding part, 213-First fold line, 214-Bending structure, 22-Conductive sheet, 23-Mounting reinforcing plate, 24-Connector, 25-Mounting bracket, 26-Temperature acquisition component, 261-Temperature sensing reinforcing plate, 262-Sampling line branch, 263-Temperature sensor, 264-Protective block; 3-Integral component, 31-Receiving groove, 32-Supporting plane, 33-Pole post connection through hole, 34-Positioning post; 4-Battery casing; 41-Mating slot; 5-Cell assembly; 6-Body body; 7-Battery pack. Detailed Implementation

[0029] The terms "first," "second," etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Directional terms used in this application, such as "first direction," "second direction," etc., are merely for reference to the orientation shown in the accompanying drawings. The use of directional terms is for better and clearer explanation and understanding of this application, and not to indicate the orientation of the referred device or component in a practical application scenario.

[0030] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0031] The term "perpendicular" refers to the current technological level, rather than an absolutely strict mathematical definition. Slight deviations are allowed, and approximations of perpendicularity are acceptable. For example, "the second direction is perpendicular to the first direction" means that the second direction is perpendicular or approximately perpendicular to the first direction, and the angle between A and B can be between 85 degrees and 95 degrees.

[0032] With the development of high-mileage and lightweight vehicles, the same space in the battery pack 7 requires more battery cells to withstand greater current demands. As the current-carrying component, the busbar assembly 1 needs to be as wide and thin as possible to meet temperature rise requirements under high current, resulting in a larger installation space requirement. The sampling line assembly 2, as the signal transmission carrier, needs a certain line width to reduce resistance and ensure data acquisition accuracy. The number of lines is affected by the number of cells in a single row; more cells mean more lines, requiring a wider circuit board, further increasing the installation space requirement for the sampling line assembly 2. The increased installation space requirements for both the busbar assembly 1 and the sampling line assembly 2 make it difficult for the existing battery pack 7 layout to simultaneously meet the installation space requirements of both.

[0033] Therefore, in order to solve the above-mentioned technical problems, this application embodiment improves the structure of the busbar assembly 1 and the sampling line assembly 2, so as to meet the temperature rise requirements of the busbar assembly 1 under high current and the line quantity and line width requirements of the sampling line assembly 2 while ensuring the space utilization of the battery pack 7, so as to integrate more battery cells in a limited space.

[0034] The embodiments of this application are described below with reference to the accompanying drawings.

[0035] Please see Figure 14 , Figure 14This is a schematic diagram of the vehicle structure disclosed in the embodiments of this application. The vehicle can be, but is not limited to, a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle.

[0036] In this embodiment, the vehicle includes a body 6, a battery pack 7, and an electric drive system. The battery pack 7 is fixedly mounted on the bottom of the body 6, and the electric drive system is located at the front-wheel drive and / or rear-wheel drive position of the body 6, and is fixedly connected to the body 6. The battery pack 7 is electrically connected to the electric drive system and supplies power to the electric drive system. After receiving power, the electric drive system converts electrical energy into mechanical energy to drive the vehicle to move.

[0037] Please see Figure 13 , Figure 13 This is a schematic diagram of the battery pack 7 disclosed in an embodiment of this application. The battery pack 7 includes a battery housing 4, multiple cell groups 5, and the aforementioned integrated busbar. The battery housing 4 encloses an accommodating space, and the multiple cell groups 5 and the integrated busbar are all located inside the battery housing 4. The battery pack 7 includes multiple cell groups 5, which are arranged side by side along a second direction. Each cell group 5 includes multiple cells arranged sequentially along a first direction. The multiple cell groups 5 are all connected to the integrated busbar. The cell connection bar 11 of the integrated busbar is used to realize the series and parallel connection of two adjacent cells in the same cell group 5. The cell group 5 bridging connection bar 12 of the integrated busbar is used to realize the series and parallel connection between two adjacent cell groups 5.

[0038] Please see Figures 1-5 The integrated busbar includes a busbar assembly 1 and a sampling line assembly 2. The sampling line assembly 2 includes a data acquisition circuit board 21 and multiple conductive sheets 22. The data acquisition circuit board 21 includes a main body 211 and a folded portion 212. The data acquisition circuit board 21 is folded along a first fold line 213 to form the main body 211 and the folded portion 212 facing each other. The length direction of the data acquisition circuit board 21 and the first fold line 213 are both along a first direction. The sampling line assembly 2 and the busbar assembly 1 are connected by multiple conductive sheets 22. The data acquisition circuit board 21 can be a flexible printed circuit (FPC); the conductive sheets 22 can be nickel sheets or other conductive metal sheets.

[0039] This configuration, with the folded portion 212 overlapping the main body 211, reduces the width of the sampling line assembly 2, thereby reducing its installation space occupancy. This frees up more space for the adjacent busbar assembly 1, allowing it to be designed as thinner and wider. As a current-carrying component, the thinner and wider shape of the busbar assembly 1 ensures its temperature rise performance under high current and increases its heat dissipation area, further optimizing its temperature rise performance. By improving the structure of the busbar assembly 1 and the sampling line assembly 2, the space utilization of the battery pack 7 is maintained while meeting the temperature rise requirements of the busbar assembly 1 under high current and the requirements for the number and width of the sampling line assembly 2, enabling the integration of more battery cells within a limited space. Furthermore, the folding method eliminates the need for modifications to the circuit board manufacturing process. Compared to traditional double-sided or multi-layer circuit boards, this application reduces production costs and facilitates standardization.

[0040] Optionally, please refer to Figure 3 Some conductive sheets 22 are spaced apart along the first direction on the side of the main body 211 away from the first fold line 213, and the remaining conductive sheets 22 are spaced apart along the first direction on the side of the folded portion 212 close to the first fold line 213.

[0041] With this configuration, the busbar assembly 1 has inter-cell connection bars 11 on both sides corresponding to a sampling line assembly 2. The lines connecting to the inter-cell connection bars 11 on both sides are respectively placed on the main body 211 and the folded part 212, which allows for a more reasonable distribution of the lines. The width of the folded part 212 in the second direction can be smaller than the width of the main body 211 in the second direction, thereby exposing the side of the main body 211 away from the first fold line 213, which facilitates the installation of the conductive sheet 22. The second direction is perpendicular to the first direction.

[0042] Optionally, please refer to Figure 1 and Figure 2 The integrated busbar also includes an integrated component 3, which has a receiving groove 31 and a supporting plane 32. The receiving groove 31 has a pole post connection through hole 33 inside. The busbar assembly 1 is connected to the receiving groove 31, and the sampling line assembly 2 is connected to the supporting plane 32. Specifically, both the receiving groove 31 and the supporting plane 32 are provided with multiple positioning posts 34. Both the busbar assembly 1 and the sampling line assembly 2 have positioning holes. The connection and positioning of the two components are achieved by inserting the positioning posts 34 into the positioning holes.

[0043] With this configuration, the busbar assembly 1 and the sampling line assembly 2 are integrated together by the integrator 3, and manufactured, transported, and assembled as a single unit. The pre-drilled terminal connection holes 33 on the receiving groove 31 facilitate the welding connection between the busbar assembly 1 and the battery cell terminal at the terminal connection holes 33.

[0044] Optionally, please refer to Figures 3-5 The sampling line assembly 2 also includes a mounting reinforcement plate 23, a connector 24, and a mounting bracket 25. One end of the acquisition circuit board 21 extends out of the integrated component 3 and forms a bent structure 214. The mounting reinforcement plate 23 and the connector 24 are both connected to the bent structure 214. The connection between the connector 24 and the bent structure 214 of the acquisition circuit board 21 can be achieved by welding, piercing crimping, or gold finger insertion. The beam inside the battery housing 4 is provided with a mating groove 41 for connecting with the mounting bracket 25. The mounting bracket 25 can be connected to the mating groove 41, increasing the installation stability of the sampling line assembly 2. Integrating the mounting bracket 25 into the sampling line assembly 2 can reduce the number of parts during assembly and improve assembly efficiency.

[0045] This configuration ensures that the bending structure 214, the mounting reinforcement plate 23, the connector 24, and the mounting bracket 25 are all located on the outside of the integrated component 3. The size of the mounting reinforcement plate 23 and the connector 24 is no longer limited by the installation space occupied by the busbar assembly 1, and different sizes and shapes of mounting reinforcement plates 23 and connectors 24 can be used according to the needs of different battery packs 7.

[0046] Optionally, please refer to Figure 6 and Figure 7 The sampling line assembly 2 also includes multiple temperature acquisition components 26. Each temperature acquisition component 26 includes a temperature-sensing reinforcing plate 261, a sampling line branch 262, and a temperature sensor 263. The temperature-sensing reinforcing plate 261 and the temperature sensor 263 are respectively disposed on different sides of the sampling line branch 262. A clamping gap is formed between the busbar assembly 1 and the integrated component 3. The temperature-sensing reinforcing plate 261 and the sampling line branch 262 are inserted into the clamping gap, and the sampling line branch 262 is connected to the acquisition circuit board 21. The temperature sensor 263 can be a negative temperature coefficient thermistor (NTC thermistor). With this configuration, the temperature sensing reinforcement plate 261 and the sampling line branch 262 are clamped and positioned by the busbar assembly 1 and the integrated component 3, ensuring the stability of the temperature acquisition component 26. Furthermore, the temperature acquisition component 26 can be positioned without the need for other positioning structures, which can reduce the structural complexity of the integrated busbar.

[0047] Optionally, please refer to Figure 6 and Figure 7 The temperature acquisition component 26 also includes a protective block 264, which is disposed on the side of the sampling line branch 262 facing the temperature sensor 263. A clearance cavity is formed in the middle of the protective block 264, and the temperature sensor 263 is located in the clearance cavity. A snap-fit ​​groove 114 is provided on the busbar assembly 1, and the outside of the protective block 264 is connected to the snap-fit ​​groove 114. The protective block 264 and the snap-fit ​​groove 114 can be rectangular in shape (see [reference]). Figure 7 ) or stepped (see Figure 6 ).

[0048] With this configuration, the temperature sensor 263 is protected by a protective block 264 surrounding it. The protective block 264 is also engaged with the slot 114 of the busbar assembly 1, which further ensures the limiting effect on the temperature acquisition component 26 and guarantees the stability of the temperature acquisition component 26.

[0049] Optionally, please refer to Figure 1 , Figure 2 , Figures 8-10 The busbar assembly 1 includes multiple cell-to-cell connection bars 11. Each cell-to-cell connection bar 11 includes a first connection part 111, a second connection part 112, and a buffer part 113. The first connection part 111 and the second connection part 112 are respectively disposed on different sides of the buffer part 113. The buffer part 113 is U-shaped, wavy, or folded.

[0050] The first connecting part 111 and the second connecting part 112 are used to connect with two different cell terminals by welding. The battery pack 7 includes multiple cell groups 5, which are arranged side by side along a second direction. Each cell group 5 includes multiple cells arranged sequentially along a first direction. The cell connection busbar 11 is used to realize the series and parallel connection of two adjacent cells in the same cell group 5. The first connecting part 111 and the second connecting part 112 are both provided with positioning holes that connect to the positioning post 34 of the busbar assembly 1.

[0051] Please refer to Figure 8The U-shaped buffer portion 113 refers to the buffer portion 113 forming a U-shaped groove structure 1131 or a U-shaped boss structure between the first connecting portion 111 and the second connecting portion 112. For example, the size of the recess or the protrusion is not less than 1.5mm. The displacement caused by the expansion of the battery cell, vibration, etc., can be absorbed by the deformation of the U-shaped groove structure 1131 or the U-shaped boss structure under pressure. The wavy buffer portion 113 refers to the buffer portion 113 forming a wavy structure 1132 with grooves and bosses spaced apart between the first connecting portion 111 and the second connecting portion 112. For example, the recess size of the groove of the wavy structure 1132 is not less than 1.5mm, and the protrusion size of its boss is not less than 1mm. The displacement caused by the expansion of the battery cell, vibration, etc., can be absorbed by the deformation of the groove and the boss of the wavy structure 1132 under pressure.

[0052] Please see Figure 9 The folded shape of the buffer section 113 means that, based on the buffer section 113 using the U-shaped groove structure 1131, a folded spring sheet structure 1133 is provided. There is a certain gap between the spring sheet structure 1133 and the U-shaped groove structure 1131, so that the spring sheet structure 1133 can have a certain amount of room to move, so that it can absorb the displacement caused by the expansion and vibration of the battery cell through the deformation of the spring sheet structure 1133 and the U-shaped groove.

[0053] Please see Figure 10 The folded spring structure 1133 folds only the part outside the welding area of ​​the cell connection row 11, which can reduce the upsetting or machining process required by welding in the welding area and reduce costs. The welding area refers to the area where the first connection part 111 and the second connection part 112 are connected to the cell electrode by welding.

[0054] With this configuration, the deformation of the buffer section 113 absorbs the displacement caused by the expansion and vibration of the battery cell, which can reduce the risk of failure of the battery cell terminal under stress and deformation in various working conditions.

[0055] Optionally, please refer to Figure 11 and Figure 12The busbar assembly 1 also includes at least one battery cell group 5 bridging busbar component 12. Each battery cell group 5 bridging busbar component 12 includes a bridging busbar body 121 and two adapter pieces 122. The bridging busbar body 121 includes a third connecting part 1211, a fourth connecting part 1212 and a bridging part 1213. The third connecting part 1211 and the fourth connecting part 1212 are respectively disposed on different sides of the bridging part 1213. An adapter piece 122 is respectively disposed between the third connecting part 1211 and the fourth connecting part 1212 and the integrated component 3. A positioning part 1221 is disposed on the adapter piece 122. A positioning mating part 1214 is disposed on both the third connecting part 1211 and the fourth connecting part 1212. The positioning part 1221 is connected to the positioning mating part 1214.

[0056] The cell-to-cell connection bar 11, the bridging connection bar body 121, and the adapter plate 122 can all be made of aluminum alloy. The battery pack 7 includes multiple cell groups 5, which are arranged side by side along a second direction. Each cell group 5 includes multiple cells arranged sequentially along a first direction. The bridging connection bar member 12 of the cell group 5 is used to realize the series and parallel connection between two adjacent cell groups 5. The thickness of the adapter plate 122 is less than the thickness of the first connecting part 111 and the thickness of the second connecting part 112.

[0057] The positioning part 1221 on the adapter piece 122 can be a positioning boss 12211 (see [link]). Figure 11 ) or card block 12212 (see Figure 12 The positioning mating parts 1214 on the third connecting part 1211 and the fourth connecting part 1212 are positioning grooves 12141 that mate with the positioning boss 12211 (see [link]). Figure 11 ) or the card slot 12142 that mates with the card block 12212 (see [link]). Figure 12 The adapter plate 122, the third connecting part 1211, and the fourth connecting part 1212 are all provided with positioning holes that connect to the positioning post 34 of the busbar assembly 1. The bridging part 1213 is located outside the integrated part 3 and can abut against the beam inside the battery casing 4 outside the cell assembly 5 through foam.

[0058] With this configuration, both the adapter piece 122 and the bridging connector body 121 are connected to the busbar assembly 1, and the adapter piece 122 and the bridging connector body 121 also have a positioning and mating structure, which can realize the bridging connection of the separate cell group 5. During assembly, the adapter piece 122 is first connected to the sampling line assembly 2 through the conductive piece 22. During battery assembly, the adapter piece 122 and the bridging connector body 121 are then welded to the cell terminal. This can prevent the bridging part 1213 located outside the integrated component 3 from increasing the space requirements of the integrated busbar process tooling and transport tray.

[0059] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. An integrated busbar, characterized in that: The assembly includes a busbar assembly (1) and a sampling line assembly (2). The sampling line assembly (2) includes a data acquisition circuit board (21) and a plurality of conductive sheets (22). The data acquisition circuit board (21) includes a main body (211) and a folded part (212). The data acquisition circuit board (21) is folded along a first fold line (213) to form the main body (211) and the folded part (212) facing each other. The length direction of the data acquisition circuit board (21) and the first fold line (213) are both along a first direction. The sampling line assembly (2) is connected to the busbar assembly (1) through the plurality of conductive sheets (22).

2. The integrated busbar according to claim 1, characterized in that: Some of the conductive sheets (22) are spaced apart along the first direction on the side of the main body (211) away from the first fold line (213), and the remaining conductive sheets (22) are spaced apart along the first direction on the side of the folded portion (212) near the first fold line (213).

3. The integrated busbar according to claim 1, characterized in that: The integrated busbar also includes an integrated component (3), which is provided with a receiving groove (31) and a supporting plane (32). The receiving groove (31) is provided with a pole post connection through hole (33). The busbar assembly (1) is connected to the receiving groove (31), and the sampling line assembly (2) is connected to the supporting plane (32).

4. The integrated busbar according to claim 3, characterized in that: The sampling line assembly (2) also includes a mounting reinforcement plate (23), a connector (24) and a mounting bracket (25). One end of the acquisition circuit board (21) extends out of the integrated component (3) and forms a bent structure (214). The mounting reinforcement plate (23) and the connector (24) are both connected to the bent structure (214).

5. The integrated busbar according to claim 3, characterized in that: The sampling line assembly (2) also includes multiple temperature acquisition components (26). The temperature acquisition components (26) include a temperature-sensing reinforcing plate (261), a sampling line branch (262), and a temperature sensor (263). The temperature-sensing reinforcing plate (261) and the temperature sensor (263) are respectively disposed on different sides of the sampling line branch (262). A clamping gap is formed between the busbar assembly (1) and the integrated component (3). The temperature-sensing reinforcing plate (261) and the sampling line branch (262) are inserted into the clamping gap. The sampling line branch (262) is connected to the acquisition circuit board (21).

6. The integrated busbar according to claim 5, characterized in that: The temperature acquisition component (26) further includes a protective block (264), which is disposed on the side of the sampling line branch (262) facing the temperature sensor (263); a relief cavity is formed in the middle of the protective block (264), and the temperature sensor (263) is located in the relief cavity; a snap-fit ​​groove (114) is provided on the busbar assembly (1), and the outside of the protective block (264) is connected to the snap-fit ​​groove (114).

7. The integrated busbar according to claim 1, characterized in that: The busbar assembly (1) includes multiple cell-to-cell connection bars (11), each of the multiple cell-to-cell connection bars (11) includes a first connection part (111), a second connection part (112) and a buffer part (113), the first connection part (111) and the second connection part (112) are respectively disposed on different sides of the buffer part (113); the buffer part (113) is U-shaped, wavy or folded.

8. The integrated busbar according to claim 3, characterized in that: The busbar assembly (1) further includes at least one cell group bridging busbar component (12). Each cell group bridging busbar component (12) includes a bridging busbar body (121) and two adapter pieces (122). The bridging busbar body (121) includes a third connection part (1211), a fourth connection part (1212), and a bridging part (1213). The third connection part (1211) and the fourth connection part (1212) are respectively disposed on the bridging busbar. On different sides of the part (1213), the third connecting part (1211) and the fourth connecting part (1212) are respectively provided with an adapter piece (122) between them and the integrated part (3). The adapter piece (122) is provided with a positioning part (1221). The third connecting part (1211) and the fourth connecting part (1212) are both provided with a positioning mating part (1214). The positioning part (1221) is connected to the positioning mating part (1214).

9. A battery pack, characterized in that: Including the integrated busbar as described in any one of claims 1-8.

10. A vehicle, characterized in that: Includes the battery pack as described in claim 9.

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