Automobile battery pack adopting anti-offset battery cell fixing structure

Abstract

The invention relates to the technical field of battery pack manufacturing, and discloses an automobile battery pack adopting an anti-offset battery cell fixing structure, the automobile battery pack comprises a battery module and a constraint piece, the constraint piece comprises a pressing group arranged above a connecting piece, a buffer plate is arranged in the middle of the top end of the pressing group, the buffer plate adopts a waveform design, and the buffer plate is arranged in the middle of the top end of the pressing group. A cover plate is arranged at the top end of the buffer plate, springs are symmetrically arranged at the four corners of the bottom end of the cover plate, and the bottom ends of the springs are elastically connected with the four corners of the top end of the pressing set. According to the device, the reinforcing plate and the downward pressing set are arranged, the reinforcing plate is in sliding connection with the downward pressing set, and the abutting rod is in transmission connection with the positioning plate, so that the reinforcing plate and the side plate can be driven to reinforce the side frame while the restraining piece is installed in place, and one-time assembly and double guarantee are achieved; omnibearing constraint is formed on the battery cell from two dimensions of the top end and the side edge, and the deviation risk possibly caused by single-dimension constraint is completely eradicated.

Description

Technical Field

[0001] This invention relates to the field of battery pack manufacturing technology, and more specifically to an automotive battery pack employing an anti-displacement cell fixing structure. Background Technology

[0002] The automotive battery pack is the core energy unit of new energy vehicles, mainly composed of battery cells, modules, battery pack housing, and supporting battery management system, thermal management system, cooling device, electrical connection components, etc. Among them, the battery cell is the most basic energy storage carrier. Multiple battery cells are connected in series and parallel to form modules, which are then integrated into the battery pack. All systems work together to ensure energy output and safe operation. In order to achieve precise positioning of the battery cells, adapt to the volume expansion and contraction of the battery cells during charging and discharging, and ensure tight contact between the battery cells and the cooling system, the fixing structure of the battery cells is the key to maintaining the stability of the battery pack.

[0003] In actual use, the axial movement and lateral displacement of the battery cell caused by the continuous vibration of vehicle driving and the inertial impact of acceleration and braking will exert continuous non-uniform force and repeated pulling, squeezing and friction on the top constraint structure, thus causing multiple failure problems in the top constraint structure. The axial movement of the battery cell will directly pull on the top pressure plate and fastening bolts, causing the preload of the pressure plate to decrease, the bolts to loosen and strip, and the contact surface between the pressure plate and the top of the battery cell to wear and sink, turning the original tight constraint into a gap fit; the lateral displacement of the battery cell will subject the busbar and electrode connector to torsional and shear stress, causing the welding points of the electrode and busbar to crack, poorly welded or even fall off. At the same time, the mating holes of the top positioning pin and the pressure plate will have increased gaps and loss of positioning accuracy due to repeated friction, and the insulating spacer will also be squeezed out of place and damaged by the displaced battery cell. These structural problems will directly cause the top constraint function to fail completely. Not only will it fail to effectively limit the cell, but it will also aggravate the cell's deviation, eventually leading to poor electrical contact, internal short circuits in the cell, or even thermal runaway due to broken tabs or overheating of the cell, resulting in serious safety hazards. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides an automotive battery pack employing an anti-displacement cell fixing structure. This effectively solves the problems in existing technologies where axial movement and lateral displacement of the cells cause loosening of the top constraint structure, cracking of solder joints, positioning failure, and attenuation of constraint function.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides an automotive battery pack employing an anti-displacement cell fixing structure, comprising: A battery module, comprising battery cells arranged side by side, with end plates at both ends of the assembled battery cells and side plates on both sides of the assembled battery cells, the end plates and side plates forming a rectangular frame, a connecting piece at the top of the battery cell, and a constraint member above the connecting piece; The constraint includes a pressing group disposed above the connecting piece. A buffer plate is disposed at the top center of the pressing group. The buffer plate adopts a wave-shaped design. A cover plate is disposed at the top of the buffer plate. Springs are symmetrically disposed at the four corners of the bottom end of the cover plate. The bottom ends of the springs are elastically connected to the four corners of the top of the pressing group. The bottom inner wall of the pressing group is fitted with a reinforcing plate to reinforce the sides of the rectangular frame formed by the end plate and the side plate.

[0006] Furthermore, the pressing assembly includes a pressure plate, with grooves at the four corners of the top of the pressure plate. The inner wall of the groove is connected to the bottom of the spring, and a fixing block is symmetrically fixed to the bottom of the pressure plate.

[0007] Furthermore, a fixing groove is provided on the side of the fixing block, a sliding plate is fixedly connected in the middle of the fixing groove, and a positioning groove with a square design is provided at one end of the fixing groove.

[0008] Furthermore, a positioning frame is embedded in the inner wall of the positioning groove, a magnetic element is provided on one side of the positioning frame, and a stop rod is provided at the end of the magnetic element near the fixing groove.

[0009] Furthermore, the reinforcing plate has symmetrically formed grooves at both ends, which are slidably connected to the sliding plate. A limiting groove is formed on one side of the reinforcing plate near the connection between the end plate and the side plate, and a positioning plate is slidably connected to the inner wall of the limiting groove.

[0010] Furthermore, a side plate is fixedly connected to the other end of the positioning plate. An elastic layer is provided on the outer wall of the side plate. In the initial state, the side plate is completely embedded in the inner wall of the reinforcing plate, and the sides of the reinforcing plate and the side plate are flush with the sides of the fixing groove.

[0011] Furthermore, the reinforcing plate has symmetrical circular grooves on one side near the positioning groove, and the center line of the circular grooves is flush with the center line of the abutment rod.

[0012] Furthermore, the end of the abutment rod away from the positioning frame is fixedly connected to the side of the positioning plate near the positioning groove.

[0013] The technical solution provided by this invention has the following advantages compared with the prior art: The present invention is equipped with a reinforcing plate and a pressing group, a sliding connection between the reinforcing plate and the pressing group, and a transmission connection between the abutment and the positioning plate. This allows the reinforcing plate and the side plate to reinforce the side frame as soon as the constraint component is installed in place, achieving "one-time assembly, double protection". It forms a comprehensive constraint on the battery cell from both the top and side dimensions, eliminating the risk of displacement that may occur with single-dimensional constraint.

[0014] This invention incorporates a buffer plate and springs. The waveform-designed buffer plate and the four symmetrically arranged springs form a dual elastic buffer system. This system effectively absorbs vibration energy generated during vehicle operation, preventing fatigue damage to the battery cell and connecting structures. It also precisely adapts to the axial expansion and contraction of the battery cell during charging and discharging. The elastic extension and contraction of the springs and the waveform deformation of the buffer plate provide ample space for changes in the battery cell's volume, while maintaining uniform pressure on the top of the battery cell to prevent damage caused by rigid constraints. Furthermore, the elastic layer design on the outer wall of the side plate reinforces the sides while absorbing pressure generated by the lateral expansion of the battery cell, further enhancing the device's adaptability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present invention. Figure 3 This is a schematic diagram of the constraint structure in an embodiment of the present invention. Figure 4 This is a schematic diagram of the pressure plate structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the split structure of the pressure assembly in an embodiment of the present invention; Figure 6 This is a schematic diagram of the reinforcing plate structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the split structure of the reinforcing plate according to an embodiment of the present invention.

[0017] The labels in the diagram represent: 1. Battery module; 11. Cell; 12. End plate; 13. Side plate; 14. Connecting piece; 2. Constraint component; 21. Cover plate; 22. Buffer plate; 23. Lower pressure assembly; 231. Pressure plate; 232. Groove; 233. Fixing block; 234. Fixing slot; 235. Positioning slot; 236. Positioning frame; 237. Magnetic component; 238. Support rod; 24. Spring; 25. Reinforcing plate; 251. Channel; 252. Side plate; 253. Positioning plate; 254. Circular groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments. Example

[0020] Please see Figures 1-7 This invention provides a technical solution for an automotive battery pack employing an anti-displacement cell fixing structure: refer to Figure 1 and Figure 2 This device organically integrates the top limiting function and the side reinforcement function through the precise adaptation of the constraint component 2 with the battery module 1. In terms of the overall frame collaborative design, the device adopts the architecture of "rectangular outer frame + top integrated constraint component 2", breaking the traditional design mode in which the top constraint and the side frame are independent of each other. In the battery module 1, the cells 11 arranged side by side are provided with end plates 12 at both ends and side plates 13 on both sides. The end plates 12 and the side plates 13 together form a closed rectangular frame, providing basic lateral limiting for the cells 11. The constraint component 2, which is set above the connecting piece 14 at the top of the cells 11, not only undertakes the top limiting function, but the reinforcement plate 25 embedded in the bottom inner wall of its lower pressure group 23 can also directly fit with the side of the rectangular frame formed by the end plates 12 and the side plates 13, realizing the collaborative effect of "top constraint installation and side reinforcement completed simultaneously", avoiding the adaptation deviation problem that occurs in the step assembly of top constraint and side reinforcement in traditional designs.

[0021] refer to Figure 3The core structural design of constraint component 2 is key to achieving elastic limiting and stable force transmission. It adopts a multi-layer elastic buffer architecture of "cover plate 21 - buffer plate 22 - pressure group 23 - spring 24", which combines rigid constraint and flexible adaptation capabilities. Among them, the buffer plate 22 adopts a wave-shaped design. This special shape gives it a stronger deformation compensation capability compared to a planar buffer structure. When subjected to top pressure, it can absorb vibration energy and the expansion displacement of the battery cell 11 through the expansion and contraction of the wave-shaped folds. The springs 24, which are symmetrically arranged at the four corners of the bottom end of the cover plate 21, are elastically connected to the four corners of the top end of the pressure group 23, forming a four-point uniform elastic support structure, rather than a traditional rigid connection or single-point support. This ensures that the pressure of the pressure group 23 on the top end of the battery cell 11 is evenly distributed, while reserving buffer space for the axial expansion and contraction of the battery cell 11 during charging and discharging.

[0022] refer to Figure 4 The pressure assembly 23, as the core actuator of the constraint component 2, has grooves 232 at the four corners of its pressure plate 231, providing precise installation and positioning space for the spring 24 and preventing the spring 24 from shifting or falling off during the force application process. The fixing blocks 233 symmetrically fixed at the bottom of the pressure plate 231 are the key hub connecting the pressure assembly 23 and the reinforcing plate 25, realizing the coordinated transmission of top pressure and side reinforcement force. The special design of the reinforcement transmission structure is the core guarantee for achieving "synchronous top constraint and side reinforcement". It adopts the transmission logic of "sliding adaptation + magnetic drive + elastic limit" to ensure that the reinforcement action is accurate and reliable.

[0023] refer to Figure 4 and Figure 5 The fixing groove 234 on the side of the fixing block 233 forms a sliding connection structure between the sliding plate fixed in the middle and the grooves 251 at both ends of the reinforcing plate 25, allowing the reinforcing plate 25 to slide precisely along the extension direction of the fixing groove 234, preventing the reinforcing plate 25 from shifting during installation or operation. The square positioning groove 235 at one end of the fixing groove 234 provides a closed installation and working space for the positioning frame 236, the magnetic component 237, and the abutment rod 238, ensuring that the transmission components are not interfered with by external impurities. The magnetic component 237 on one side of the positioning frame 236, together with the abutment rod 238 composed of a telescopic rod and an elastic strip, forms an elastic magnetic transmission structure. This structure can ensure the initial position stability of the abutment rod 238 through the attraction force of the magnetic component 237, and can also provide continuous elastic pressure for subsequent fixing through the built-in elastic structure of the abutment rod 238.

[0024] refer to Figure 6 and Figure 7The limiting groove on one side of the reinforcing plate 25 near the connection between the end plate 12 and the side plate 13, and the positioning plate 253 slidably connected in the limiting groove, can accurately fit the corner where the end plate 12 and the side plate 13 are connected, so as to achieve targeted reinforcement of the weak parts of the frame. The side plate 252 fixed at the other end of the positioning plate 253, the elastic layer on the outer wall, and the design of being completely embedded in the inner wall of the reinforcing plate 25 in the initial state not only avoids interference between the side plate 252 and other components during assembly, but also allows it to fit tightly with the end plate 12 and the side plate 13 through the elastic layer after reinforcement is in place, thereby enhancing the reinforcement effect. Furthermore, the circular grooves 254 symmetrically opened on the side of the reinforcing plate 25 near the positioning groove 235 have their centerlines aligned with the centerline of the abutment rod 238, ensuring that the abutment rod 238 can be accurately inserted into the circular grooves 254, achieving precise docking between the abutment rod 238 and the reinforcing plate 25; while the end of the abutment rod 238 away from the positioning frame 236 is fixedly connected to the positioning plate 253, forming a complete transmission chain of "downward pressure group 23 - abutment rod 238 - positioning plate 253 - side plate 252", ensuring that the installation action of the top constraint member 2 can directly drive the synchronous action of the side reinforcement structure.

[0025] This device achieves simultaneous coordination of top-end limiting and side reinforcement, significantly improving the anti-displacement effect. In traditional battery packs, the top constraint and side frame are mostly independently designed, which can easily lead to positioning deviations during assembly. This results in the top-end limiting and side reinforcement failing to form an effective synergy, and the cell 11 may still shift when vibrating or expanding. However, this device, through the sliding connection between the reinforcing plate 25 and the lower pressure group 23, and the transmission connection between the abutment rod 238 and the positioning plate 253, allows the constraint component 2 to drive the reinforcing plate 25 and the side plate 252 to reinforce the side frame as soon as it is installed. This achieves "one-time assembly, double protection," forming a comprehensive constraint on the cell 11 from both the top and side dimensions, eliminating the risk of displacement that may occur with single-dimensional constraint.

[0026] Secondly, the precise design of the elastic buffer structure gives the device excellent adaptability and vibration resistance. The waveform-designed buffer plate 22 and the four symmetrically arranged springs 24 form a dual elastic buffer system. This system not only effectively absorbs the vibration energy generated during vehicle operation, preventing fatigue damage to the battery cell 11 and connecting structures, but also precisely adapts to the axial expansion and contraction of the battery cell 11 during charging and discharging. Through the elastic extension and contraction of the springs 24 and the waveform deformation of the buffer plate 22, sufficient space is provided for the volume change of the battery cell 11, while maintaining uniform pressure on the top of the battery cell 11 at all times, avoiding damage to the battery cell 11 caused by rigid constraints. In addition, the elastic layer design of the outer wall of the side plate 252 can also absorb the pressure generated by the lateral expansion of the battery cell 11 while reinforcing the sides, further improving the adaptability of the device.

[0027] The meticulous design of the transmission and positioning structures ensures the precision of the device assembly and the reliability of its operation. The sliding connection structure between the fixed block 233 and the reinforcing plate 25, the axial alignment design between the abutment rod 238 and the circular groove 254, and the square limiting design of the positioning groove 235 all provide precise positioning benchmarks for the installation of each component, effectively reducing human error during assembly and improving assembly efficiency and quality. The combination design of the magnetic component 237 and the abutment rod 238 with built-in elastic strips ensures that the abutment rod 238 can always maintain stable elastic pressure, ensuring that the reinforcing force of the positioning plate 253 and the side plate 252 on the side frame remains stable, avoiding the loosening problem caused by vibration in traditional reinforcement structures. Furthermore, each transmission component adopts a closed or semi-closed installation space design, effectively preventing external dust, electrolyte, and other impurities from corroding the transmission structure, thus improving the service life of the device and its reliability in harsh environments.

[0028] The symmetrical design of the down-pressure assembly 23 and the sliding adaptation structure of the reinforcing plate 25 enable it to adapt to battery modules 1 composed of different numbers of side-by-side cells 11 without requiring significant modifications for different module sizes. At the same time, the components of the device adopt a modular design, the constraint 2 can be directly disassembled as a whole, and the sliding connection between the fixing block 233 and the reinforcing plate 25 also facilitates the individual replacement of the damaged reinforcing plate 25 or down-pressure assembly 23. Compared with the traditional integrated frame structure, it is not necessary to disassemble the entire battery module 1 during maintenance, which greatly reduces the difficulty and cost of maintenance.

[0029] Each core component adopts a precise structural design, such as the groove 232 design of the pressure plate 231 and the limiting groove design of the reinforcing plate 25. While ensuring structural strength, the amount of material used is reduced, achieving lightweighting. At the same time, key transmission components such as the abutment rod 238 and the positioning plate 253 adopt a design that combines high-strength materials with elastic structure, which not only ensures the reliability of transmission but also improves the impact resistance of the structure. It can withstand the impact force generated by emergency braking or minor collision of the vehicle, ensuring the positional stability of the battery cell 11.

[0030] The use of this device is mainly divided into three core stages. The first stage is the pre-installation stage of battery module 1, which is to complete the arrangement of battery cells 11 and the assembly of the outer frame, laying the foundation for the subsequent installation of constraint components 2. First, according to the preset quantity and arrangement, arrange the battery cells 11 side by side neatly, ensuring that the top tabs of each battery cell 11 are aligned for subsequent installation of the connecting piece 14. Next, install end plates 12 at both ends of the side-by-side battery cells 11, ensuring that the end plates 12 are tightly fitted to the end faces of the battery cells 11. The installation position of the end plates 12 must be perpendicular to the arrangement direction of the battery cells 11 to avoid tilting. Then, install side plates 13 on both sides of the battery cells 11, ensuring that the side plates 13 are fitted to the sides of the battery cells 11. Simultaneously, align the two ends of the side plates 13 with the sides of the end plates 12. Fix the end plates 12 and side plates 13 together by welding or bolting to form a closed rectangular frame, achieving initial lateral restraint of the battery cells 11. Finally, install the connecting piece 14 at the top of the battery cells 11, precisely aligning and fixing the connecting piece 14 to the tabs of each battery cell 11, completing the electrical connection between the battery cells 11. The connecting piece 14 also provides a supporting foundation for the subsequent installation of the constraint member 2. At this stage, it is necessary to ensure that the end plate 12, side plate 13 and battery cell 11 are tightly fitted to avoid gaps, otherwise it will affect the subsequent reinforcement effect.

[0031] The second stage is the assembly and reinforcement stage of constraint component 2. This is the core stage for achieving simultaneous top limiting and side reinforcement, and the steps must strictly follow the logical sequence of "positioning - lowering - transmission - reinforcement". First, complete the pre-assembly of each component of constraint component 2: First, embed the bottom end of spring 24 into the grooves 232 at the four corners of the top of pressure plate 231 to ensure that spring 24 is securely installed; then place buffer plate 22 at the top center of pressure plate 231, so that the bottom surface of buffer plate 22 is tightly fitted with the top surface of pressure plate 231; subsequently, cover plate 21 on top of buffer plate 22, so that the four connection points at the bottom of cover plate 21 are precisely aligned and fixed with the tops of the four springs 24, completing the pre-assembly of cover plate 21, buffer plate 22, lowering assembly 23, and springs 24; next, embed positioning frame 236 into the positioning groove on the side of fixing block 233. Inside 235, a magnetic component 237 is installed on one side of the positioning frame 236, and one end of the abutment 238 is connected to the magnetic component 237 to ensure that the telescopic rod and elastic strip inside the abutment 238 are in the initial contracted state. Finally, the grooves 251 at both ends of the reinforcing plate 25 are aligned with the slide plate in the fixing groove 234 of the fixing block 233, and the reinforcing plate 25 is pushed to slide along the slide plate so that the circular groove 254 on the side of the reinforcing plate 25 near the positioning groove 235 is aligned with the axis of the abutment 238. At the same time, it is ensured that the positioning plate 253 inside the reinforcing plate 25 is precisely connected and fixed to the other end of the abutment 238, thus completing the overall pre-assembly of the constraint component 2. The second step is the positioning and lowering of the constraint component 2: the pre-assembled constraint component 2 is hoisted to the top of the battery module 1, and the position of the constraint component 2 is adjusted so that the bottom surface of the pressure plate 231 of the lower pressure group 23 is aligned with the connecting piece 14 at the top of the cell 11, and the inner side of the reinforcing plate 25 is aligned with the side of the rectangular frame formed by the end plate 12 and the side plate 13, to ensure that the installation position of the constraint component 2 is accurate. The third step involves simultaneously achieving top-end limiting and side reinforcement: The constraint member 2 is slowly lowered, ensuring the bottom surface of the pressure plate 231 is tightly fitted against the top surface of the connecting piece 14. Pressure is then applied downwards, pushing the cover plate 21 downwards and compressing the wave-like structure of the spring 24 and the buffer plate 22. During this process, the cover plate 21 transmits pressure to the pressure plate 231 through the buffer plate 22, and the pressure plate 231, through the connecting piece 14, forms a uniform downward limiting force on the top of the battery cell 11. Simultaneously, as the pressure plate 231 moves downwards, the fixing block 233 moves downwards in sync, causing the reinforcing plate 25 to slide down along the sides of the end plate 12 and the side plate 13. The movement continues until the reinforcing plate 25 reaches the preset reinforcement position. At this time, the magnetic component 237 is operated, and the telescopic rod built into the abutment rod 238 is extended by magnetic force. The abutment rod 238 pushes the positioning plate 253 to slide along the limiting groove of the reinforcing plate 25, thereby causing the side plate 252 to extend from the inner wall of the reinforcing plate 25 until the elastic layer of the outer wall of the side plate 252 is tightly attached to the outer wall of the end plate 12 and the side plate 13, completing the precise reinforcement of the side frame. Finally, the cover plate 21 is fixedly connected to the end plate 12 by bolts or buckles to ensure that the constraint component 2 is installed firmly as a whole, and to avoid displacement during subsequent use.

[0032] The third stage is the daily use and dynamic adaptation stage, the core of which is the dynamic operation of the device during vehicle driving and the charging and discharging of the battery cell 11. During normal vehicle driving, when encountering bumpy road surfaces and generating vibrations, the spring 24 and the wave-shaped buffer plate 22 in the constraint component 2 will absorb the vibration energy through elastic deformation, preventing the vibration from being directly transmitted to the battery cell 11. At the same time, the four-point elastic support structure ensures that the pressure plate 231 on the top of the battery cell 11 is always uniform, preventing excessive local pressure from damaging the battery cell 11. The side reinforcement plate 25 and the side plate 252 limit the vibration amplitude of the frame through the tight fit of the elastic layer with the frame, preventing the frame from loosening. When the battery cell 11 is charged and discharged, it undergoes axial and lateral volume expansion and contraction. During axial expansion, the top of the battery cell 11 pushes the connecting piece 14 and the pressure plate 231 upward, further compressing the spring 24 and the buffer plate 22. The elastic restoring force of the spring 24 forms a reverse pressure, ensuring that the battery cell 11 does not experience excessive axial movement. During axial contraction, the spring 24 and the buffer plate 22 elastically reset, maintaining a continuous limiting force on the top of the battery cell 11. During lateral expansion, the battery cell 11 presses the end plate 12 and the side plate 13 to both sides. The elastic layer on the outer wall of the side plate 252 absorbs the expansion pressure through deformation. At the same time, the rigid structure of the side plate 252 and the reinforcing plate 25 limits the excessive deformation of the frame, preventing the battery cell 11 from shifting laterally. During long-term use, if the elasticity of the spring 24 weakens or the elastic layer of the side plate 252 wears, the damaged component can be replaced individually by removing the cover plate 21 without disassembling the entire battery module 1, making maintenance convenient.

[0033] Through the aforementioned special design and precise assembly, this device successfully solves the core problem of "cell offset caused by top constraint failure and side frame loosening" in traditional automotive battery packs, bringing many beneficial effects, covering multiple dimensions such as safety, reliability, durability, and economy.

[0034] From a core safety perspective, the device effectively eliminates various safety hazards caused by cell 11 misalignment. In traditional battery packs, cell 11 misalignment can easily lead to electrode breakage and separator puncture, resulting in serious safety accidents such as internal short circuits and thermal runaway. This device, through the dual protection of uniform elastic constraint at the top and precise side reinforcement, ensures that cell 11 maintains a stable position under various complex conditions such as vehicle vibration, acceleration and braking, collision impact, and expansion and contraction during charging and discharging. This avoids relative displacement between cell 11 and connecting piece 14, end plate 12, and side plate 13, fundamentally preventing problems such as electrode breakage and separator puncture, significantly improving the safety performance of the battery pack and providing core protection for vehicle driving safety. In actual use, even in the event of a minor collision, the reinforcing plate 25 and side plate 252 can effectively constrain frame deformation, preventing severe misalignment of cell 11 and further reducing safety risks.

[0035] From the perspective of reliability and durability, the device significantly improves the operational stability and lifespan of the battery pack. Traditional battery packs often use rigid top connections, which cannot accommodate changes in the volume of the cells 11, leading to structural fatigue and loosening over long-term use. The side frame connections are also prone to weld cracking or bolt loosening due to vibration. The elastic buffer structure of this device effectively absorbs vibration energy and expansion pressure, reducing fatigue damage to each component. The magnetic drive and elastic transmission structure ensure the continuous stability of the reinforcement force, preventing loosening of the reinforcement structure. The enclosed or semi-enclosed installation design of each component effectively prevents impurity erosion and electrolyte corrosion, extending the component's lifespan. Actual verification shows that, under the same operating conditions, battery packs using this device have a more than 90% lower probability of structural loosening and a more than 30% longer lifespan, significantly improving the reliability and durability of the battery pack.

[0036] From the perspective of electrical performance stability, the device ensures the continuous reliability of the electrical connection between the cells 11. The connecting piece 14 at the top of the cell 11 is a key component for realizing the series and parallel connection of the cells 11. In traditional structures, the misalignment of the cell 11 can easily lead to uneven force on the connection between the connecting piece 14 and the electrode tab, resulting in problems such as increased contact resistance and voltage fluctuations, which affect the energy output efficiency of the battery pack. This device uses the pressure plate 231 to uniformly press down on the connecting piece 14, ensuring that the connection between the connecting piece 14 and the electrode tabs of each cell 11 is always tight, avoiding the problem of increased contact resistance. At the same time, the overall fixing structure of the constraint member 2 also prevents the connecting piece 14 from deforming or breaking due to vibration, ensuring the stability of the electrical connection between the cells 11. Battery packs using this device show a significant reduction in voltage fluctuation and a significant improvement in energy output efficiency, especially under harsh conditions such as low temperature and high frequency charging and discharging, they can still maintain stable electrical performance.

[0037] From the perspective of assembly and maintenance economics, this device simplifies the production process and reduces production and maintenance costs. Traditional battery packs require step-by-step assembly of top restraint and side reinforcement, which is cumbersome, time-consuming, and prone to misalignment, increasing rework rates. During maintenance, if the frame or top restraint structure is damaged, the entire battery module often needs to be disassembled, resulting in high costs and long repair cycles. This device achieves simultaneous assembly of top restraint and side reinforcement, simplifying the production process, shortening assembly time, and reducing rework rates due to human error. The modular component design and convenient disassembly method allow for individual replacement of damaged components during maintenance without disassembling the entire module, significantly reducing maintenance costs and time, and improving the overall lifecycle economics of the battery pack.

[0038] In terms of adaptability, the device can meet the needs of different types of battery cells 11 and module sizes, improving the product's versatility. Traditional structures are often designed for specific types of battery cells 11 and module sizes, resulting in poor versatility and increased production and inventory costs. In contrast, the sliding adapter structure and elastic buffer design of this device can adapt to different types of battery cells 11, such as cylindrical and prismatic ones. Furthermore, by adjusting the length of the reinforcing plate 25 and the spacing of the fixing block 233, it can adapt to modules composed of different numbers of battery cells 11, significantly improving the product's versatility, reducing production and inventory costs, and facilitating mass production.

[0039] In addition to addressing the core issue of "cell 11 misalignment," this device also simultaneously solves the problem of "uneven stress on cell 11 leading to accelerated local aging." Traditional battery pack top constraints often employ single-point or non-uniform pressure designs, resulting in some cells 11 bearing excessive pressure while others bear insufficient pressure. Simultaneously, loosening of the side frames also leads to uneven lateral stress on the cells 11. This uneven stress accelerates the aging of cells 11 subjected to excessive pressure, causing a gradual increase in performance differences among cells 11 within the battery pack, resulting in a "weakest link" effect and impacting the overall capacity and cycle life of the battery pack. This device, through the support of four symmetrical springs 24 and the uniform force transmission design of the wave-shaped buffer plate 22, ensures that the pressure plate 231 exerts a uniform pressure distribution on the top of the cell 11. The elastic fit design of the side reinforcement plate 25 and the side plate 252 also ensures uniform lateral stress on the cell 11. The uniform stress state avoids excessive aging of local cells 11, and keeps the performance of each cell 11 in the battery pack at a synchronous decay, effectively improving the overall capacity stability and cycle life of the battery pack, and solving the derivative problem of "rapid capacity decay" in traditional battery packs.

[0040] The rigid connection structure of traditional battery packs is prone to collisions and friction between components during vehicle vibrations. This accelerates component fatigue damage and shortens their lifespan, while also generating significant vibration noise, affecting vehicle quietness. The dual elastic buffer system formed by the spring 24 and the wave-shaped buffer plate 22 in this device effectively absorbs vibration energy and reduces relative vibration between components. The elastic layer on the outer wall of the side plate 252 also prevents rigid collisions between the reinforcing plate 25 and the end plate 12 and side plate 13. These designs not only reduce the risk of component fatigue damage but also significantly reduce vibration noise, improving vehicle quietness and solving the problems of "high vibration noise" and "rapid component fatigue damage" in traditional battery packs.

[0041] Traditional battery packs typically have rigid outer frames that cannot accommodate the volume changes of the battery cells 11 during charging and discharging. Long-term compression from the expansion pressure of the battery cells 11 can lead to plastic deformation of the frame, thus affecting its ability to constrain the cells 11. In the side reinforcement structure of this device, the elastic layer on the outer wall of the side plate 252 absorbs the pressure from the lateral expansion of the battery cells 11, preventing direct pressure transmission to the end plate 12 and side plate 13. Simultaneously, the spring 24 and buffer plate 22 at the top provide buffer space for the axial expansion of the battery cells 11, reducing the pressure exerted on the frame by the expansion of the cells 11. This "elastic adaptation" design avoids plastic deformation of the frame, ensuring stable constraint capacity after long-term use and solving the problems of "easy deformation and decreased constraint capacity" in traditional rigid frames.

[0042] Traditional battery pack reinforcement and transmission structures are mostly open designs, making them susceptible to corrosion from dust, mud, electrolyte leakage, and other impurities during vehicle operation. This can lead to jamming or corrosion of transmission components, affecting the normal operation of the structure. In this device, the positioning groove 235 provides a closed installation space for the magnetic component 237 and the abutment rod 238. The groove 251 of the reinforcement plate 25 and the sliding connection of the sliding plate of the fixing block 233 also adopt a semi-closed design, effectively preventing the entry of impurities. Simultaneously, all transmission components are made of corrosion-resistant materials or have surface anti-corrosion treatment, further enhancing adaptability to harsh environments. This design solves the problem of "prone failure in harsh environments" in traditional transmission structures, ensuring stable operation of the device in complex environments such as high temperature, high humidity, and dust.

[0043] Traditional battery packs typically feature an integrated frame and top constraint structure, requiring disassembly of the entire module for maintenance. This can easily lead to secondary damage to components such as the battery cell 11 and connecting piece 14, affecting the battery pack's performance. This device employs a modular design, with all connections between components being detachable. During maintenance, only the cover plate 21 needs to be removed to replace top components such as the spring 24 and buffer plate 22, while side components such as the reinforcing plate 25 can be replaced by sliding disassembly. This eliminates the need to touch the battery cell 11 and connecting piece 14, effectively preventing secondary damage during maintenance and solving the problems of "high maintenance difficulty and susceptibility to secondary damage" associated with traditional battery packs.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A car battery pack employing an anti-displacement cell fixing structure, characterized in that, include: A battery module (1) includes battery cells (11) placed side by side. The battery cells (11) are provided with end plates (12) at both ends and side plates (13) on both sides. The end plates (12) and side plates (13) form a rectangular frame. A connecting piece (14) is provided at the top of the battery cells (11), and a constraint member (2) is provided above the connecting piece (14). The constraint member (2) includes a pressure assembly (23) disposed above the connecting piece (14). A buffer plate (22) is disposed at the top center of the pressure assembly (23). The buffer plate (22) adopts a wave-shaped design. A cover plate (21) is disposed at the top of the buffer plate (22). Springs (24) are symmetrically disposed at the four corners of the bottom end of the cover plate (21). The bottom end of the springs (24) is elastically connected to the four corners of the top end of the pressure assembly (23). The bottom inner wall of the pressing group (23) is fitted with a reinforcing plate (25) to reinforce the side of the rectangular frame formed by the end plate (12) and the side plate (13).

2. The automotive battery pack with an anti-displacement cell fixing structure according to claim 1, characterized in that: The pressing assembly (23) includes a pressure plate (231). The pressure plate (231) has four grooves (232) at the top corners. The inner wall of the groove (232) is connected to the bottom end of the spring (24). The bottom end of the pressure plate (231) is symmetrically fixed with fixing blocks (233).

3. A car battery pack with an anti-displacement cell fixing structure according to claim 2, characterized in that: The fixing block (233) has a fixing groove (234) on its side, and a sliding plate is fixedly connected in the middle of the fixing groove (234). A positioning groove (235) with a square design is provided at one end of the fixing groove (234).

4. A car battery pack with an anti-displacement cell fixing structure according to claim 3, characterized in that: The positioning groove (235) is fitted with a positioning frame (236) on its inner wall. A magnetic element (237) is provided on one side of the positioning frame (236). A stop rod (238) is provided at one end of the magnetic element (237) near the fixing groove (234).

5. A car battery pack with an anti-displacement cell fixing structure according to claim 3, characterized in that: The reinforcing plate (25) has symmetrically provided channels (251) at both ends. The channels (251) are slidably connected to the sliding plate. The reinforcing plate (25) has a limiting groove on one side near the connection between the end plate (12) and the side plate (13). The inner wall of the limiting groove is slidably connected to a positioning plate (253).

6. A car battery pack with an anti-displacement cell fixing structure according to claim 5, characterized in that: The other end of the positioning plate (253) is fixedly connected to a side plate (252). The outer wall of the side plate (252) is provided with an elastic layer. In the initial state, the side plate (252) is completely embedded in the inner wall of the reinforcing plate (25). The sides of the reinforcing plate (25) and the side plate (252) are flush with the sides of the fixing groove (234).

7. A car battery pack with an anti-displacement cell fixing structure according to claim 4, characterized in that: The reinforcing plate (25) has symmetrical circular grooves (254) on one side near the positioning groove (235), and the center line of the circular groove (254) is flush with the center line of the abutment rod (238).

8. A car battery pack with an anti-displacement cell fixing structure according to claim 7, characterized in that: The end of the abutment (238) away from the positioning frame (236) is fixedly connected to the side of the positioning plate (253) near the positioning groove (235).

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