Battery cell connecting assembly and battery module

Abstract

The invention discloses a battery cell connecting assembly and a battery module, the battery cell connecting assembly is used for electrically connecting a plurality of battery cells, the battery cell connecting assembly comprises a connecting module, and the connecting module comprises a bracket; the support comprises a plurality of installation parts and a plurality of pressure relief parts which are arranged at intervals in the first direction, and the pressure relief parts are arranged between every two adjacent installation parts. The pressure relief part is provided with a plurality of pressure relief cavities, the pressure relief cavities are arranged at intervals in the second direction, the support is provided with a plurality of pressure relief grooves, the pressure relief grooves are arranged at intervals in the second direction, and each pressure relief groove is communicated with the corresponding pressure relief cavity; the plurality of battery cells are respectively fixed on the mounting part and respectively cover the openings of the plurality of pressure relief grooves. The battery cell connecting assembly provided by the invention has the characteristic of reliable safety protection.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a cell connection assembly and a battery module equipped with the cell connection assembly. Background Technology

[0002] As the core connection unit of a battery module, the cell connection assembly plays a crucial role in connecting cells in series and parallel, and is widely used in new energy vehicles, energy storage power stations, and other fields. With the development of battery technology towards high integration, high safety, and customization, existing cell connection assemblies have gradually revealed many shortcomings: the pressure relief structure of existing cell connection assemblies is mostly open, and when a single cell experiences thermal runaway, the high-temperature, high-pressure ejected material can easily spread to adjacent cells, triggering a chain reaction and seriously threatening the safety of the battery module. To address the aforementioned deficiencies of existing technologies, a safe and reliable cell connection assembly is urgently needed. Summary of the Invention

[0003] The purpose of this application is to provide a safe and reliable cell connection assembly and a battery module equipped with the cell connection assembly.

[0004] This application provides a battery cell connection assembly for electrically connecting multiple battery cells. The assembly includes a connection module, which in turn includes a bracket. The bracket includes multiple mounting portions and multiple pressure relief portions arranged at intervals along a first direction, with a pressure relief portion located between each pair of adjacent mounting portions. Each pressure relief portion has multiple pressure relief chambers arranged at intervals along a second direction. The bracket also has multiple pressure relief grooves arranged at intervals along the second direction, each groove communicating with a pressure relief chamber. Multiple battery cells are respectively fixed to the mounting portions, each covering the openings of the pressure relief grooves. In this application embodiment, the spaced arrangement of the mounting portions and pressure relief portions eliminates pressure relief protection blind spots, and the battery cells covering the openings of the pressure relief grooves allow thermal runaway products to be directed into the pressure relief chambers, thus blocking heat propagation at its source.

[0005] In some embodiments, the pressure relief section includes an enclosing frame, a cover plate, and multiple partitions. The enclosing frame is disposed on the side of the support opposite to the opening of the pressure relief groove, and surrounds the outer periphery of the multiple pressure relief grooves. The cover plate is connected to the side of the enclosing frame opposite to the support. The multiple partitions are disposed within the enclosing frame and are spaced apart along a second direction, with a pressure relief cavity between adjacent partitions. The enclosing frame and the cover plate form a closed pressure relief space, which can block impurities and prevent blockage of the pressure relief channel. The partitions separate independent pressure relief cavities to prevent cross-flow of thermal runaway products from adjacent cells, while the integrated structure improves the structural strength of the pressure relief section.

[0006] In some embodiments, the pressure relief chamber includes a receiving section and a discharge section that communicate with each other, the receiving section being farther away from the cover plate relative to the discharge section; the enclosing frame is provided with a pressure relief hole, the pressure relief hole communicating with the discharge section. The receiving section can temporarily store thermal runaway products and weaken their kinetic energy, reducing wear on the pressure relief structure; the discharge section, in conjunction with the pressure relief hole, enables the directional discharge of products and balances the pressure within the chamber, improving the controllability of pressure relief.

[0007] In some embodiments, the bracket includes a support plate, the pressure relief groove is formed on the side of the support plate opposite to the pressure relief portion, and both the pressure relief portion and the mounting portion are disposed on the side of the support plate opposite to the pressure relief groove; the mounting portion has multiple mounting cavities, which are spaced apart along a second direction, and the support plate has multiple mounting through holes on the bottom surface of the mounting cavities, the number of mounting through holes being adapted to the number of battery cell terminals; the battery cell terminals pass through the mounting through holes and are positioned in the mounting cavities. The support plate achieves functional zoning for pressure relief and installation, avoiding structural interference; the mounting through holes can guide the battery cell terminals to accurately extend into the mounting cavities, improving the assembly accuracy and efficiency of the battery cell and the mounting portion.

[0008] In some embodiments, the cell connection assembly further includes multiple aluminum busbars, each positioned within a plurality of mounting cavities. Each aluminum busbar has a positioning hole opposite the mounting through-hole, and the cell electrode passes through the mounting through-hole and is electrically connected to the wall of the positioning hole. The precise correspondence between the aluminum busbar positioning hole and the mounting through-hole ensures a reliable electrical connection between the cell electrode and the aluminum busbar, reduces contact resistance, and improves the stability and conductivity of the electrical connection.

[0009] In some embodiments, the mounting portion includes a mounting frame and isolation plates; the mounting frame is disposed on the side of the support plate opposite to the pressure relief groove, and a plurality of isolation plates are disposed within the mounting frame, the plurality of isolation plates being arranged at intervals along a second direction, with a mounting cavity between two adjacent isolation plates. The isolation plates separate independent mounting cavities, enabling independent arrangement of the aluminum busbars, effectively blocking the short-circuit risk of adjacent aluminum busbars, and improving the insulation protection level of the electrical connection area.

[0010] In some embodiments, the cavity wall of the mounting cavity is provided with a hook and multiple limiting protrusions, both of which protrude into the interior of the mounting cavity; the hook engages with the aluminum busbar, and the limiting protrusions abut against the side of the aluminum busbar. The hook and limiting protrusions form a multi-directional limiting structure, which can firmly fix the aluminum busbar, prevent the aluminum busbar from shifting or loosening under battery module vibration conditions, and ensure the stability of the aluminum busbar installation.

[0011] In some embodiments, the cell connection assembly includes at least two connection modules, which are detachable and connectable. This enables rapid detachable and connectable connection modules, providing a basis for expanding the assembly capacity.

[0012] In some embodiments, the supports of at least two of the connecting modules are connected to connecting protrusions via matching connecting slots. The connecting slots are located at one end of one of the supports, and the connecting protrusions are located at the end of the other support facing the connecting slots. This matching structure of the connecting slots and connecting protrusions enables quick and easy assembly and disassembly of the connecting modules, ensuring the overall structural stability of the assembled component and providing a foundation for expanding the component's capacity.

[0013] In some embodiments, one of the brackets is provided with a plurality of connecting slots, which are spaced apart along a second direction; another bracket is provided with a plurality of connecting protrusions, which are also spaced apart along the second direction; the plurality of connecting protrusions are detachably positioned in the plurality of connecting slots. The multiple sets of connecting slots and connecting protrusions distributed along the second direction can form multiple stress support points in the width direction of the bracket, preventing warping and offset after module assembly, and improving the flatness and vibration and impact resistance of the assembled structure.

[0014] In some embodiments, the cell connection assembly further includes a detection component, which includes a voltage acquisition unit and a temperature acquisition unit; the acquisition end of the voltage acquisition unit is electrically connected to the aluminum busbar; the acquisition end of the temperature acquisition unit is connected to the surface of the aluminum busbar. The detection component can acquire voltage and temperature data of the aluminum busbar in real time, promptly report electrical connection and heating abnormalities, provide data support for battery module safety protection, and improve the component's safety monitoring capabilities.

[0015] This application also provides a battery module comprising multiple battery cells and the aforementioned battery cell connection assembly. The top cover of each battery cell covers an opening corresponding to the pressure relief groove, and the pressure relief valve of each battery cell is positioned within the pressure relief chamber of the battery cell connection assembly. By combining the expandability and pressure relief protection characteristics of the battery cell connection assembly, the battery module can flexibly adapt to different capacity requirements, while simultaneously enhancing the overall thermal runaway cascading propagation protection level of the system.

[0016] In this application, the mounting section and the pressure relief section are arranged at intervals along the first direction, forming a balanced layout of mounting section-pressure relief section-mounting section, avoiding blind spots in the pressure relief protection of the battery cell; and the compact arrangement of the mounting and pressure relief functions does not require additional independent protection space, effectively improving the space utilization of the battery pack and adapting to the design requirements of large-size, highly integrated battery modules; the layout of the battery cell covering the opening of the pressure relief groove ensures that high-temperature gas, debris and other products generated by thermal runaway of a single battery cell can only be directed into the pressure relief chamber through the corresponding pressure relief groove, avoiding the random diffusion of products to adjacent battery cells, blocking the risk of chain propagation of thermal runaway from the source, and strengthening the safety protection level of the battery module. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0018] Figure 1 This is a three-dimensional structural diagram of the cell connection assembly provided in the embodiments of this application; Figure 2 yes Figure 1 A three-dimensional structural diagram of the cell connection assembly from another perspective; Figure 3 yes Figure 1 An exploded view of the cell connection assembly in the diagram; Figure 4 yes Figure 2 An exploded view of the cell connection assembly in the diagram; Figure 5 This is a three-dimensional structural diagram of the battery cell module provided in the embodiments of this application; Figure 6 yes Figure 1 An exploded view of the cell connection assembly in the diagram; Figure 7 yes Figure 2 An exploded view of the cell connection assembly in the diagram; Figure 8 yes Figure 1 A schematic diagram of the three-dimensional structure of the central support; Figure 9 yes Figure 8 A three-dimensional structural diagram of the central support from another perspective; Figure 10 yes Figure 8 Enlarged view of section A; Figure 11 yes Figure 9 Enlarged view of section B.

[0019] Explanation of reference numerals in the attached drawings: 100-Cell connection assembly; 200-Cell; 20-Shell; 21-Positive electrode; 22-Negative electrode; 23-Pressure relief valve; 201-Top cover; 10-Connection module; 30-First connection module; 40-Second connection module; 31-First bracket; 41-Second bracket; 311-Connection protrusion; 411-Connection groove; 11-Bracket; 101-Functional transition area; 1101-Support plate; 1102-Mounting through hole; 1103-Connecting post; 111-Pressure relief groove; 12-Mounting part; 121-Mounting frame; 1201-Mounting cavity; 122-Isolation plate; 1222-Hook; 1223 - Limiting protrusion; 14 - Pressure relief section; 140 - Enclosing frame; 141 - Pressure relief chamber; 1401 - Pressure relief hole; 142 - Cover plate; 143 - Partition plate; 1412 - Receiving section; 1413 - Discharge section; 50 - Aluminum busbar; 51 - Series aluminum busbar; 52 - Connecting aluminum busbar; 53 - Output aluminum busbar; 501 - Positioning hole; 503 - Detection groove; 60 - Detection component; 61 - Voltage acquisition component; 62 - Temperature acquisition component; 63 - Connector; 631 - External connector; 632 - Module docking connector; 64 - Conduit; 641 - Main pipe; 642 - Branch pipe; 1104 - Cable tie hole; 1105 - Baffle. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0023] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0024] The directional terms "upper," "top," "lower," "bottom," "left," and "right" used in the description of the embodiments in this application are based on the orientation shown in the accompanying drawings. "Upper" and "top" refer to the positive Z-axis direction, "lower" and "bottom" refer to the negative Z-axis direction, "right" refers to the positive X-axis direction, and "left" refers to the negative X-axis direction. These terms do not constitute a limitation on the actual application of the cell connection assembly 100. The terms "same," "equal," "consistent," or "parallel" used herein are all allowed to have certain tolerances.

[0025] For ease of description, the Y-axis is defined as the thickness direction of the cell connecting assembly 100, the Z-axis as the width direction of the cell connecting assembly 100, and the X-axis as the length direction of the cell connecting assembly 100. The X, Y, and Z axes are all perpendicular to each other. Please refer to... Figures 1 to 5 The battery module provided in this application includes a cell connection assembly 100 and a plurality of cells 200, which are installed and fixed by the cell connection assembly 100.

[0026] The battery cell 200 includes a housing 20, an electrode assembly, and a pressure relief valve 23. The electrode assembly consists of a positive electrode 21, a negative electrode 22, and a separator. The electrode assembly is made of corresponding electrode materials (e.g., the positive electrode 21 uses ternary lithium / lithium iron phosphate, and the negative electrode 22 uses graphite). The housing 20 is a sealed structure with an internal cavity to house the electrolyte and the electrode assembly. The tabs of the positive electrode 21 and the negative electrode 22 are welded to the positive and negative electrode posts, respectively. The electrode posts extend out of the housing 20 and are exposed, serving as interfaces for electrical connection. The pressure relief valve 23 is located in the top cover 201 area of ​​the housing 20. When the internal pressure / temperature of the battery cell 200 reaches a threshold, the pressure relief valve 23 opens to release internal products.

[0027] The cell connection assembly 100 is used to electrically connect multiple cells 200. It includes a connection module 10, which includes a bracket 11. The bracket 11 includes multiple mounting portions 12 and multiple pressure relief portions 14 arranged at intervals along a first direction. A pressure relief portion 14 is provided between each two adjacent mounting portions 12, forming an alternating arrangement of mounting portion-pressure relief portion-mounting portion along the first direction. The pressure relief portion 14 has multiple pressure relief chambers 141, which are arranged at intervals along a second direction. The bracket 11 is provided with multiple pressure relief grooves 111, which are located on the side of the bracket 11 facing the cell 200. The multiple pressure relief grooves 111 are arranged at intervals along the second direction, and each pressure relief groove 111 connects to a pressure relief chamber 141. The multiple cells 200 are respectively fixed to the mounting portions 12. The multiple cells 200 are located on the side of the bracket 11 along the negative Y-axis, and each cell 200 covers the opening of a pressure relief groove 111, so that the cell product can be directionally introduced into the pressure relief chamber 141.

[0028] The alternating arrangement of the mounting section 12 and the pressure relief section 14 achieves a balanced layout of mounting section-pressure relief section-mounting section, avoiding blind spots in pressure relief protection; and the compact arrangement of the mounting and pressure relief functions eliminates the need for additional independent protection space, effectively improving the space utilization of the battery pack and adapting to the design requirements of large-size, highly integrated battery modules.

[0029] The first direction mentioned above corresponds to the direction indicated by the X-axis in the figure, which is the extension direction of the main body of the cell connection assembly 100, that is, the length direction of the assembly. The multiple mounting portions 12 and pressure relief portions 14 on the bracket 11 are arranged at intervals along this direction, achieving a one-to-one correspondence between mounting and pressure relief functions, avoiding blind spots in protection. The second direction corresponds to the direction indicated by the Z-axis in the figure, which is the lateral direction perpendicular to the first direction, that is, the width direction of the assembly. The multiple pressure relief grooves 111 on the side of the bracket 11 facing the cell 200 are arranged at intervals along this direction, adapting to the lateral arrangement requirements of multiple cells 200.

[0030] During the use of cell 200, the electrolyte undergoes chemical or electrochemical reactions with the positive electrode 21 and negative electrode 22, generating a certain amount of gas in the inner cavity of the outer casing 20, and the electrolyte temperature also rises accordingly. As cell 200 continues to be used, the rate of temperature rise and gas production in the inner cavity gradually accelerates until the gas pressure / temperature in the inner cavity reaches a preset threshold, at which point the high-temperature electrolyte will be released from the top cover 201. This poses a risk of localized damage (potentially damaging components such as the detection harness and aluminum busbar of the cell connection assembly, leading to electrical connection failure or monitoring interruption), and more importantly, it may trigger a chain reaction of failures (the ejected high-temperature electrolyte and gas diffuse to the surface / inner cavity of adjacent cells 200, accelerating their gas production and temperature rise process, thereby triggering a chain reaction of thermal runaway in the battery module).

[0031] The cell connection assembly 100 can specifically mitigate the above risks: on the one hand, it provides a dedicated pressure relief channel for each cell 200, so that the high-temperature gas, debris and other products generated by the thermal runaway of a single cell 200 can only enter the pressure relief chamber 141 through the corresponding pressure relief groove 111, avoiding direct diffusion to adjacent cells 200 and blocking the chain spread of thermal runaway from the source; on the other hand, it can ensure that the thermal runaway products are directed into the pressure relief chamber 141, improving the controllability of pressure relief.

[0032] Please see Figure 8 and Figure 9 The bracket 11 also includes a support plate 1101, a pressure relief groove 111 is provided on the side of the support plate 1101 facing the battery cell, and the pressure relief part 14 and the mounting part 12 are both provided on the side of the support plate 1101 away from the battery cell.

[0033] The pressure relief section 14 includes an enclosure frame 140, a cover plate 142, and a plurality of partitions 143. The enclosure frame 140 is disposed on the side of the support 11 away from the opening of the pressure relief groove, and the enclosure frame 140 surrounds the outer periphery of the plurality of pressure relief grooves 111. The enclosure frame 140 has a plurality of pressure relief chambers 141. The cover plate 142 is connected to the side of the enclosure frame 140 away from the support. The plurality of partitions 143 are located inside the enclosure frame 140. The plurality of partitions 143 are arranged at intervals along the second direction, and an independent pressure relief chamber 141 is formed between two adjacent partitions 143.

[0034] The enclosure frame 140, cover plate 142, multiple partitions 143 and support plate 1101 of bracket 11 are integrally injection molded structures, which can not only ensure structural strength, but also withstand the erosion of high-temperature products during thermal runaway of the battery cell.

[0035] The enclosure frame 140 is a closed rectangular frame whose dimensions are precisely matched to the outer periphery of the multiple pressure relief grooves 111 on the support plate 1101. The top end face of the enclosure frame 140 along the positive Y-axis is connected to the cover plate 142. The flatness error of the top end face of the enclosure frame 140 is small, ensuring the relative isolation of the pressure relief chamber 141. The bottom of the enclosure frame 140 is integrally connected to the support plate 1101 without splicing gaps, which can prevent thermal runaway products from leaking from the bottom into the interior of the support.

[0036] The cover plate 142 is integrally formed with the top of the enclosure frame 140, which not only prevents dust and debris in the battery pack from entering the pressure relief chamber 141 and avoids blockage of the pressure relief channel, but also limits the spray direction of thermal runaway products and prevents upward splashing from damaging the detection harness.

[0037] The partition 143 and the enclosure frame 140 are integrally injection molded structures, evenly spaced along the second direction. The spacing between adjacent partitions is exactly the same as the spacing between pressure relief grooves 111, ensuring that each pressure relief chamber 141 formed by the partition spacing precisely corresponds to one pressure relief groove. The height of the partition 143 is flush with the height of the enclosure frame 140. The top of the partition 143 along the positive Y-axis is integrated with the cover plate 142, forming a physical barrier. The sidewall of the partition 143 fits seamlessly with the inner peripheral wall of the enclosure frame 140, completely blocking the flow of products between adjacent pressure relief chambers 141. Even if a single cell experiences thermal runaway, its products can only flow within its dedicated pressure relief chamber 141 and cannot diffuse to the pressure relief chamber 141 corresponding to adjacent cells. This is a key component that structurally prevents the chain propagation of thermal runaway. At the same time, the independent space of the pressure relief chamber 141 can also temporarily store some thermal runaway products, slowing down their ejection kinetic energy.

[0038] Please refer to the following: Figure 10 and Figure 11 The pressure relief chamber 141 includes a receiving section 1412 and a discharge section 1413. Along the flow path of the thermal runaway products, the pressure relief groove 111, receiving section 1412, and discharge section 1413 are sequentially connected. The receiving section 1412 is located away from the cover plate relative to the discharge section 1413. The receiving section 1412 is used to temporarily store the thermal runaway products of the battery cell, such as high-temperature gas, electrolyte droplets, and solid debris, preventing the products from directly impacting the discharge section and pressure relief hole at high speed, thus reducing the risk of structural wear. The sidewall of the enclosure frame 140, corresponding to the position of the discharge section 1413, is provided with a through pressure relief hole 1401. The pressure relief hole 1401 communicates with the discharge section 1413. The pressure relief hole 1401 not only enables communication between each pressure relief chamber 141 and the outside, but also balances the pressure within the pressure relief chamber 141 and discharges the thermal runaway products.

[0039] The pressure relief groove 111, the receiving section 1412, and the discharge section 1413 form a complete "introduction-temporary storage-export" flow path. The temporary storage and buffering of the receiving section 1412, the directional flow of the discharge section 1413, and the pressure balance and discharge of the pressure relief hole 1401 form a closed loop: after the thermal runaway products enter the receiving section 1412 from the pressure relief groove 111, their kinetic energy is weakened, some products are temporarily stored here, and then they are directionally guided to the pressure relief hole 1401 through the discharge section 1413, and finally discharged to the outside of the system. This design avoids thermal propagation and solves the problem of directional pressure relief, further enhancing the reliability of safety protection.

[0040] Please refer to Figures 6 to 9The mounting section 12 has multiple mounting cavities 1201, which are spaced apart along the second direction to accommodate the installation of aluminum busbars and the connection of terminals. The support plate 1101 has multiple mounting through holes 1102 on the bottom surface of the mounting cavities 1201, the number of which matches the number of terminals in a single battery cell. During assembly, the battery cell's terminals pass through the corresponding mounting through holes 1102 and are positioned within the mounting cavity 1201, completing the positioning for electrical connection with the aluminum busbar. The support plate achieves pressure relief and installation functional zoning, avoiding structural interference; the mounting through holes guide the battery cell terminals to accurately extend into the mounting cavities, improving the assembly accuracy and efficiency of the battery cell and the mounting section.

[0041] The cell connection assembly 100 also includes multiple aluminum busbars 50, which are positioned within the mounting cavity 1201. Specifically, the aluminum busbars 50 are housed within and fixed to the cavity wall of the mounting cavity 1201. A positioning hole 501 is provided on each aluminum busbar 50 directly opposite the mounting through hole 1102. The positioning hole, the mounting through hole 1102, and the cell electrode are precisely aligned. After the cell electrode passes through the mounting through hole 1102, it fits tightly against the wall of the positioning hole 501, achieving electrical connection and forming a series-parallel conductive circuit for the cells. The precise correspondence between the positioning hole and the mounting through hole ensures a reliable electrical connection between the cell electrode and the aluminum busbar, reduces contact resistance, and improves the stability and conductivity of the electrical connection.

[0042] The mounting section 12 includes a mounting frame 121 and an isolation plate 122. The mounting frame 121 is located on the side of the support plate 1101 away from the battery cell and has a closed rectangular frame structure. The mounting frame 121 surrounds the outer periphery of multiple mounting through holes 1102 and has multiple mounting cavities 1201. Multiple isolation plates 122 are disposed within the mounting frame 121 and are spaced apart along a second direction. There is a mounting cavity 1201 between two adjacent isolation plates 122. Each aluminum busbar 50 is positioned in a mounting cavity 1201 and fixed to the cavity wall of the mounting cavity 1201. The isolation plates separate independent mounting cavities, enabling independent arrangement of the aluminum busbars, independent installation and isolation protection of the aluminum busbars, effectively blocking the short-circuit risk of adjacent aluminum busbars and improving the insulation protection level of the electrical connection area.

[0043] Each aluminum busbar 50 corresponds to a separate mounting cavity 1201, which is fixed in all directions through the cavity wall structure to avoid loosening of electrical connections due to vibration. In addition, the physical separation and insulation treatment of the isolation plate 122, which is made of flame-retardant insulating material, completely blocks the short circuit risk of adjacent aluminum busbars 50 and prevents impurities from entering, ensuring the reliability of electrical connections. The spaced arrangement of the mounting frame 121 and the pressure relief part 14, and the avoidance design with the detection component wiring harness, realize the functional zoning of the electrical connection area, the safety pressure relief area, and the detection component area, taking into account both conductivity and safety protection.

[0044] In this application, the cavity wall of the mounting cavity 1201 is provided with a hook 1222 and a plurality of limiting protrusions 1223, both of which protrude into the interior of the mounting cavity 1201; the hook 1222 engages with the surface of the aluminum busbar 50 away from the battery cell, restricting the displacement of the aluminum busbar 50 along the Y-axis direction (the direction closer to or away from the battery cell); the plurality of limiting protrusions 1223 are distributed at intervals along the cavity wall of the mounting cavity, and the limiting protrusions 1223 abut against the side of the aluminum busbar 50, restricting the displacement of the aluminum busbar 50 along the X-axis (first direction) or the Z-axis (second direction).

[0045] The aluminum busbar 50 includes a series aluminum busbar 51, a connecting aluminum busbar 52, and an output aluminum busbar 53. The mounting cavity 1201 and the mounting frame 121 will be structurally adjusted according to the differences in specifications and functions of the series aluminum busbar 51, the connecting aluminum busbar 52, and the output aluminum busbar 53.

[0046] The series aluminum busbar 51 is of standard specification, with its X-axis dimension larger than its Z-axis dimension. It is used for series and parallel connection of battery cells along the X-axis direction, and the corresponding mounting cavity and mounting frame 121 have a standard layout. Two symmetrically distributed hooks 1222 are configured to symmetrically cover the middle area of ​​the upper surface of the series aluminum busbar 51, achieving balanced clamping in the Y-axis direction (thickness direction). Four limiting protrusions 1223 are distributed circumferentially along the aluminum busbar, conforming to the side of the aluminum busbar and limiting displacement in the X-axis (length direction) and Z-axis (width direction). The inner wall dimensions of the mounting cavity 1201 are precisely matched with the series aluminum busbar 51, and it has a rectangular structure, maintaining a clearance distance from the pressure relief part.

[0047] The battery cells are distributed in a non-linear layout, and the series aluminum busbar 51 cannot adapt to the turning path. After the current passes through the series aluminum busbar 51 to complete the series-parallel connection of the battery cells in the straight area, it transitions to the battery cells at the bend via the connecting aluminum busbar 52, maintaining the continuity of current transmission in the bend area. The connecting aluminum busbar 52 has a larger Z-axis dimension than the X-axis dimension; therefore, the mounting cavity corresponding to the connecting aluminum busbar 52 is adapted and adjusted. The cavity wall of the mounting cavity is provided with two hooks 1222, which are staggered along the X-axis direction and form a diagonal clamping structure staggered along the Z-axis. One hook is located in the positive Z-axis region of the cavity wall in the positive X-axis direction of the mounting cavity, and the other hook is located in the negative Z-axis region of the cavity wall in the negative X-axis direction, forming a diagonal force point. Compared with a symmetrical layout, this can more accurately limit the risk of torsional displacement of the aluminum busbar caused by module splicing. Four limiting protrusions 1223 are distributed circumferentially along the aluminum busbar, conforming to the side of the aluminum busbar and limiting the displacement of the X-axis and Z-axis. The dimensions of the mounting cavity are precisely matched with the connecting aluminum strip 52, forming a rectangular structure.

[0048] The output aluminum busbar 53 includes a positive output aluminum busbar and a negative output aluminum busbar. The positive and negative output aluminum busbars are installed in the mounting cavities on both sides of the Z-axis of the first bracket 31 along one side of the negative X-axis. Their size is relatively small and they need to be exposed to connect to external devices. Therefore, the mounting cavities corresponding to the output aluminum busbar 53 are adapted and adjusted: no cavity wall is provided along the negative X-axis (to avoid obstructing the connection end of the output aluminum busbar); only one hook 1222 is provided on the cavity wall along the positive X-axis to limit the Y-axis displacement; the limiting protrusion 1223 in the Z-axis direction is retained to fit the Z-axis side of the output aluminum busbar. To compensate for the lack of X-axis limiting due to the absence of cavity walls in the negative X-axis direction, a connecting post 1103 is provided on the support plate 1101 at the position corresponding to the output aluminum busbar; a positioning hole 501 is provided on the output aluminum busbar 53, which can limit the displacement of the output aluminum busbar along the X-axis and Z-axis after docking, replacing the X-axis cavity wall and limiting protrusion of the conventional mounting cavity, which not only meets the space requirements for external connection of external equipment, but also ensures the lateral / longitudinal stability of the aluminum busbar; a hook 1222 on the cavity wall in the positive X-axis direction abuts against the upper surface of the output aluminum busbar, and together with the support plate, clamps the aluminum busbar and limits its movement along the Z-axis.

[0049] Please see Figure 6 and Figure 7 The cell connection assembly (100) includes at least two connection modules (10), which are detachable and splicable. For the cell connection assembly 100, the detachable splicing design of at least two connection modules 10 allows for flexible increase or decrease in the number of modules according to the battery pack capacity requirements, without the need to redesign the overall structure. It adapts to the electrical connection requirements of different cell numbers, greatly improving the versatility and scalability of the assembly. At the same time, the modular design avoids the manufacturing and transportation difficulties of the integral structure. Each module is small in size, easy to produce, and not easily damaged during transportation. If a part of the module is damaged, it can be replaced individually, reducing the risk of production yield and the cost of later maintenance.

[0050] At least two connection modules 10 are connected to a connection protrusion via matching connection slots. The connection slot is located at one end of one bracket, and the connection protrusion is located at the end of the other bracket facing the connection slot. The connection slot and the connection protrusion are located in a functional transition area 101 between adjacent mounting portions 12 and pressure relief portions 14.

[0051] This area neither occupies the core electrical connection space of the mounting section 12 nor interferes with the pressure relief channel of the pressure relief section 14. It is also spaced apart from the mounting section 12 and the pressure relief section 14 along the second direction (Z-axis), ensuring a coordinated overall layout of the assembled modules. Through the matching structure of the connecting groove and the connecting protrusion, the connecting modules can be quickly and easily disassembled and assembled, ensuring the overall structural stability of the assembled components and providing a foundation for component capacity expansion.

[0052] The number of connection modules 10 in the cell connection assembly 100 is flexibly expandable. Different numbers, such as 2, 3, or even 10, can be selected according to the capacity requirements of the battery pack. This allows for adaptation to different cell connection requirements without adjusting the module's structure. In a specific embodiment of this application, a configuration with 2 connection modules 10 will be used to describe their structure and mating relationships in detail.

[0053] The connection module 10 includes a first connection module 30 and a second connection module 40, wherein the first connection module 30 corresponds to the first bracket 31 and the second connection module 40 corresponds to the second bracket 41. The two are detachably spliced ​​through a matching connection groove and a connection protrusion. The first bracket 31 is provided with a connection protrusion 311, which is located at one end of the first bracket 31 along the positive X-axis and faces the end of the second bracket 41 along the negative X-axis, and is specifically located in the functional transition area 101 between the adjacent mounting part 12 and the pressure relief part 14 at that end. The second bracket 41 is provided with a connection groove 411, which is located at one end of the second bracket 41 along the negative X-axis and faces the end of the first bracket 31 along the positive X-axis, and is specifically located in the functional transition area 101 between the adjacent mounting part 12 and the pressure relief part 14 at that end.

[0054] During assembly, the connecting protrusion 311 of the first bracket 31 is aligned with the connecting groove 411 of the second bracket 41, and the two are precisely assembled by pushing them along the X-axis. This structural design not only ensures the structural stability of the two connecting modules after docking, but also provides a unified splicing interface for adding more connecting modules (such as adding a third connecting module), which is the core foundation for the flexible expansion of the component.

[0055] In this application, the second bracket 41 is provided with multiple connecting grooves 411, which are spaced apart along the second direction (Z-axis direction, i.e., the width direction of the bracket). Correspondingly, the first bracket 31 also has multiple connecting protrusions 311 at one end facing the connecting grooves 411, which are also spaced apart along the second direction, and each connecting protrusion 311 is detachably positioned within the connecting groove 411. The multiple sets of connecting grooves and connecting protrusions are distributed along the second direction, and the spacing between them is adapted to the width of the functional transition area 101 of the adjacent mounting part and pressure relief part, without interfering with the core functional space. This can form multiple force support points in the width direction of the bracket, avoiding warping and offset after module splicing, and improving the flatness and vibration and impact resistance of the spliced ​​structure.

[0056] The connecting groove 411 and the connecting protrusion 311 mostly adopt trapezoidal or rectangular structures with guide bevels, and their cross-sectional shapes are complementary and compatible. The opening of the connecting groove 411 is narrow and the interior is wide; the root of the connecting protrusion 311 is narrow and the end facing the groove is wide. During splicing, the narrow root of the connecting protrusion 311 can easily align with the narrow opening of the connecting groove 411. During the pushing process, the wide end of the protrusion gradually fits into the wide interior of the groove, which avoids the precise alignment pressure when splicing structures of equal width and forms a tight fit at the end of the pushing process. This improves the smoothness of assembly and ensures the fit of the structure after splicing. After splicing, the wide end of the connecting protrusion will form a hook-like fit with the wide interior of the connecting groove. When the module is subjected to reverse tension (negative X-axis direction), the wide end of the protrusion will abut against the wide interior sidewall of the groove and cannot be detached from the narrow opening, effectively limiting the reverse loosening of the module. This is especially suitable for the structural stability requirements of battery modules under complex working conditions such as vibration and impact.

[0057] This design with multiple sets of connecting grooves and protrusions enhances splicing stability. The multiple connecting structures distributed along the second direction form multiple stress support points in the width direction of the bracket, preventing warping and offset after splicing two connecting modules and ensuring the overall structural flatness of the component. It can also adapt to the width direction layout. The distribution direction of the connecting grooves and protrusions matches the arrangement of the mounting part and pressure relief part on the bracket along the second direction, making the force transmission more uniform after splicing and reducing the risk of local stress concentration. It also enhances disassembly. The detachable positioning of the multiple structures retains the flexibility of modular splicing and makes the operation during later disassembly and maintenance easier and less likely to damage the interface structure.

[0058] In other embodiments, the first bracket 31 may have a connecting groove, and the second bracket may have a connecting protrusion. The connecting groove and the connecting protrusion are still distributed correspondingly along the X-axis direction. The connecting groove is located at the positive X-axis end of the first bracket 31, facing the negative X-axis end of the second bracket 41; the connecting protrusion is located at the negative X-axis end of the second bracket 41, facing the positive X-axis end of the first bracket 31. Precise splicing can be completed by pushing along the X-axis, which also ensures the structural stability after the connecting modules are connected. During production, there is no need to strictly distinguish between modules with connecting grooves and modules with connecting protrusions; they can be flexibly combined and assembled, reducing the cost of module classification and management, and enhancing the assembly flexibility of components in practical applications.

[0059] Please see Figures 1 to 7 The cell connection assembly 100 also includes a detection assembly 60, which includes a voltage acquisition unit 61, a temperature acquisition unit 62, a connector 63, and a conduit 64. The acquisition end of the voltage acquisition unit 61 is electrically connected to the aluminum busbar 50, and the voltage acquisition unit 61 is used to acquire voltage. The acquisition end of the temperature acquisition unit 62 is connected to the surface of the aluminum busbar 50, and the temperature acquisition unit 62 is used to acquire temperature.

[0060] The voltage acquisition unit 61 employs a flexible conductive pin / crimp terminal structure at its acquisition end, which precisely aligns with the welding area of ​​the aluminum busbar 50, achieving a reliable electrical connection. The acquisition end is constrained by the conduit 64 to prevent interference with the aluminum busbar, the mounting section 12 of the bracket 11, and the pressure relief section 14. The voltage acquisition unit 61 acquires the voltage signal of the corresponding cell circuit containing the aluminum busbar in real time and transmits the data to the BMS (Battery Management System) for monitoring and protecting against overvoltage and undervoltage conditions in the cells.

[0061] The temperature acquisition unit 62 includes an epoxy resin-encapsulated NTC and an OT terminal type NTC. Detection grooves 503 are formed on the surfaces of the series aluminum busbar 51, connecting aluminum busbar 52, and output aluminum busbar 53. The epoxy resin-encapsulated NTC is embedded in the detection groove 503 and tightly adhered to the surface of the aluminum busbar with thermally conductive adhesive, acquiring the operating temperature of the series aluminum busbar 51, connecting aluminum busbar 52, and output aluminum busbar 53. The OT terminal type NTC corresponds to the exposed area of ​​the output aluminum busbar 53 and is fixed to the exposed area of ​​the output aluminum busbar 53 with screws, adapting to the connection structure of the output aluminum busbar 53 and acquiring the temperature of the output aluminum busbar 53. The temperature acquisition unit 62 feeds back the aluminum busbar temperature to the BMS in real time, triggering the overheat protection mechanism to prevent the aluminum busbar from aging and burning due to high temperature. The output aluminum busbar 53 can be equipped with both an epoxy resin-encapsulated NTC (inside the detection groove) and an OT terminal type NTC (exposed area), which respectively acquire the temperature of the aluminum busbar body and the temperature of the exposed connection area, achieving dual temperature monitoring.

[0062] Connector 63 includes an external connector 631 and a module docking connector 632. The external connector 631 is located at the end of the cell connection assembly 100 and is used to integrate the signals from the voltage acquisition unit 61 and the temperature acquisition unit 62 to transmit the detection data to the battery management system. The module docking connector 632 is used for signal interconnection between the first connection module 30 and the second connection module 40 to achieve unified aggregation of detection data from multiple modules.

[0063] The conduit 64 includes a main pipe 641 and branch pipes 642. A baffle 1105 is provided on one side of the support plate 1101. The baffle 1105 has an L-shaped limiting groove structure, and its groove width is precisely matched with the outer diameter of the main pipe 641. After the main pipe 641 is placed in the baffle 1105, its radial displacement is restricted, improving the reliability of wire protection. The baffle 1105 has multiple cable tie holes 1104, and the main pipe 641 is tied to the cable tie holes 1104 by cable ties. The main pipe 641 not only restricts radial displacement with the help of the baffle 1105, but also avoids the messy distribution of the main wires, preventing interference with the functions of the aluminum busbar 50 and the pressure relief section 14, while protecting the main wires from wear and electrolyte corrosion.

[0064] The functional transition area 101 has a reserved cable routing groove that matches the diameter of the branch pipe 642. The branch pipe 642 is placed in the functional transition area 101, and the side wall of the groove forms a lateral limit for the branch pipe 642. The branch pipe 642 is also fixed to the corresponding cable tie hole 1104 by a strap. This not only utilizes the reserved space in the functional transition area 101 to complete the branch cable routing without interfering with the splicing and matching of the connecting groove 411 and the connecting protrusion 311, but also accurately connects the local acquisition end and the module interconnection interface to ensure the continuity of signal transmission, while protecting the branch cable from damage under module splicing and vibration conditions.

[0065] The embodiments of this application have been described in detail above. Specific examples have been used in this article to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application.

Claims

1. An electrical cell connection assembly, characterized by, The electric core connecting assembly (100) comprises a connecting module (10), the connecting module (10) comprises a support (11), the support (11) comprises a plurality of mounting parts (12) and a plurality of pressure relief parts (14) arranged at intervals along a first direction, and the pressure relief part (14) is arranged between every two adjacent mounting parts (12); the pressure relief part (14) has a plurality of pressure relief cavities (141), and the plurality of pressure relief cavities (141) are arranged at intervals along a second direction; the support (11) is provided with a plurality of pressure relief grooves (111), and the plurality of pressure relief grooves (111) are arranged at intervals along the second direction; each pressure relief groove (111) is communicated with a pressure relief cavity (141); a plurality of electric cores (200) are fixed to the mounting parts (12) respectively, and each electric core (200) covers an opening of a pressure relief groove (111) respectively.

2. The cell connection assembly of claim 1, wherein, The pressure relief part (14) comprises an enclosing frame (140), a cover plate (142) and a plurality of partition plates (143); the enclosing frame (140) is arranged on a side of the support (11) away from the opening of the pressure relief groove (111), the enclosing frame (140) surrounds the outer periphery of the plurality of pressure relief grooves (111), and the cover plate (142) is connected to a side of the enclosing frame (140) away from the support (11); the plurality of partition plates (143) are arranged in the enclosing frame (140), the plurality of partition plates (143) are arranged at intervals along the second direction, and there is a pressure relief cavity (141) between every two adjacent partition plates (143).

3. The cell connection assembly of claim 2, wherein, The pressure relief cavity (141) comprises a containing section (1412) and a discharge section (1413) communicated with each other, and the containing section (1412) is away from the cover plate (142) relative to the discharge section (1413); the enclosing frame (140) is provided with a pressure relief hole (1401) communicated with the discharge section (1413).

4. The cell connection assembly of claim 1, wherein, The support (11) comprises a support plate (1101), the pressure relief groove (111) is arranged on a side of the support plate (1101) away from the pressure relief part (14), and the pressure relief part (14) and the mounting part (12) are arranged on a side of the support plate (1101) away from the pressure relief groove (111); the mounting part (12) is provided with a plurality of mounting cavities (1201) arranged at intervals along the second direction, and the support plate (1101) is provided with a plurality of mounting through holes (1102) on the bottom surface of the mounting cavity (1201), and the number of the mounting through holes (1102) is matched with the number of the pole of the electric core (200); the pole of the electric core (200) is positioned in the mounting cavity (1201) through the mounting through hole (1102).

5. The cell connection assembly of claim 4, wherein, The electric core connecting assembly (100) further comprises a plurality of aluminum bars (50), and the plurality of aluminum bars (50) are respectively positioned in the plurality of installation cavities (1201); the aluminum bar (50) is provided with a positioning hole (501) at a position opposite to the installation through hole (1102), and the pole of the electric core (200) is electrically connected with the hole wall of the positioning hole (501) after passing through the installation through hole (1102).

6. The cell connection assembly of claim 5, wherein, The installation part (12) comprises an installation frame (121) and a separation plate (122); the installation frame (121) is arranged on the side of the support plate (1101) away from the pressure relief groove (111), a plurality of separation plates (122) are arranged in the installation frame (121), the plurality of separation plates (122) are arranged in the second direction, and the adjacent two separation plates (122) are provided with the installation cavity (1201).

7. The cell connection assembly of claim 6, wherein, The cavity wall surface of the installation cavity (1201) is provided with a hook (1222) and a plurality of limiting protrusions (1223), the plurality of limiting protrusions (1223) are distributed in the cavity wall surface of the installation cavity (1201) in a spaced manner; the hook (1222) is connected with the aluminum bar (50), and the limiting protrusion (1223) is abutted against the aluminum bar (50).

8. The cell connection assembly of claim 1, wherein, The electric core connecting assembly (100) comprises at least two connecting modules (10), and the two connecting modules (10) are detachably spliced.

9. The cell connection assembly of claim 8, wherein, The supports (11) of the at least two connecting modules (10) are connected through the matching connecting grooves (411) and connecting protrusions (311), the connecting groove (411) is located at one end of one of the supports (11), and the connecting protrusion (311) is located at one end of the other support (11) facing the connecting groove (411).

10. The cell connection assembly of claim 9, wherein, One of the supports (11) is provided with a plurality of connecting grooves (411), and the plurality of connecting grooves (411) are distributed in the second direction in a spaced manner; the other support (11) is provided with a plurality of connecting protrusions (311), and the plurality of connecting protrusions (311) are distributed in the second direction in a spaced manner; and the plurality of connecting protrusions (311) are respectively detachably positioned in the plurality of connecting grooves (411).

11. The cell connection assembly of claim 4, wherein, The electric core connecting assembly (100) further comprises a voltage acquisition part (61) and a temperature acquisition part (62); the acquisition end of the voltage acquisition part (61) is electrically connected with the aluminum bar (50); and the acquisition end of the temperature acquisition part (62) is connected to the surface of the aluminum bar (50).

12. A battery module, characterized by The battery module comprises a plurality of electric cores (200) and the electric core connecting assembly (100) of claims 1 to 11, the top cover (201) of the electric core (200) covers the opening of the pressure relief groove (111), and the pressure relief valve (23) of the electric core (200) is positioned in the pressure relief cavity (141) of the electric core connecting assembly (100).

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