Shockproof and impact-resistant lithium iron phosphate battery pack end plate structure

Abstract

This invention belongs to the field of lithium iron phosphate battery technology, specifically relating to a shock-resistant and impact-resistant end plate structure for a lithium iron phosphate battery pack. It includes a base plate and an end plate frame. The base plate supports the battery pack and is connected to the end plate frame via a wedge-shaped structure. The end plate frame is located on one side of the battery pack. When the battery pack is subjected to impact and bumps, the battery pack pushes the piezoelectric ceramic sensor plate and the inclined plate, causing the slider on the inclined plate to slide along the inclined groove on the base. The buffer spring is compressed, thereby buffering the impact force of the battery pack and preventing the battery pack from squeezing the battery pack housing through the end plate frame, which could lead to irreversible deformation of the housing. This improves the stability and safety of the battery pack under vibration. When the impact force of the battery pack is large, the battery pack continues to push the inclined plate. At this time, the inclined plate is pressed down, and the wedge-shaped teeth at the bottom of the inclined plate engage with the wedge-shaped teeth at the top of the wedge block, thereby suppressing the movement of the base plate and the battery pack on the base plate.

Description

Technical Field

[0001] This invention belongs to the field of lithium iron phosphate battery technology, and specifically relates to a shockproof and impact-resistant end plate structure for a lithium iron phosphate battery pack. Background Technology

[0002] A lithium iron phosphate (LFP) battery pack is a rechargeable battery pack that uses lithium iron phosphate (LiFePO4) as the cathode material. It is a complete power supply unit formed by connecting multiple individual cells in series or parallel and equipping them with a management system and structural components. Compared to ternary lithium batteries (such as lithium cobalt oxide and nickel-manganese-cobalt), LFP has a higher decomposition temperature (approximately 270℃ vs. around 200℃ for ternary materials), making it less prone to fire and explosion under overcharging, short circuit, or high-temperature conditions.

[0003] The end plate of a lithium iron phosphate battery pack is an important structural component in the battery module or battery pack. It serves as a mechanical support and connection component of the battery system and is usually located at both ends of the entire battery pack. It is used to fix the battery cells and maintain structural stability. The end plate integrates multiple battery cells or modules into a whole through fasteners, ensuring that the internal arrangement is tight and not easily displaced.

[0004] When a battery is subjected to impact and bumps, it will squeeze the end plate. Since the end plate has extremely limited deformation capacity, it can only continue to squeeze the battery pack casing, causing the casing to undergo irreversible deformation. Moreover, during the charge and discharge cycle, the battery will inevitably expand due to expansion, which will further squeeze the end plate. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a shock-resistant and impact-resistant end plate structure for lithium iron phosphate battery packs, thereby solving the technical problems in the prior art.

[0006] The objective of this invention can be achieved through the following technical solution: a shockproof and impact-resistant end plate structure for a lithium iron phosphate battery pack, comprising a base plate and an end plate frame. The base plate supports the battery pack and is connected to the end plate frame via a wedge structure. The end plate frame is located on one side of the battery pack, and the base plate, end plate frame, and battery pack are all located inside the battery box. A base is installed on the side of the end plate frame near the battery pack. The base is connected to a sloping panel via a buffer structure. The buffer structure includes a sloping groove formed on the base. A slider is installed on the sloping panel and slides inside the sloping groove. The slider is connected to the inner wall of the sloping groove via a buffer spring.

[0007] As a further optimization or improvement to this solution, a piezoelectric ceramic sensor plate is installed on the inclined panel, and the battery pack is attached to the piezoelectric ceramic sensor plate.

[0008] As a further optimization or improvement of this solution, the end plate frame has a built-in carbon fiber plate. The end plate frame is installed with a support plate, honeycomb silicone and carbon fiber plate from the outside to the inside. The support plate is connected to the end plate frame through a connecting component.

[0009] As a further optimization or improvement of this solution, the connecting component includes an external block mounted on the end plate frame, with a strip groove formed on the external block, and a guide rod mounted on the support plate, the guide rod being inserted into the strip groove.

[0010] As a further optimization or improvement of this solution, the wedge structure includes wedge block one and wedge block two. Wedge block one is installed on the base plate, and wedge block two is installed at the bottom of the end plate frame. A guide groove is opened on wedge block two, and a guide post is installed on wedge block one. The guide groove and the guide post slide together.

[0011] As a further optimization or improvement of this solution, wedge-shaped teeth one is installed at the bottom of the inclined panel, and wedge-shaped teeth two are installed at the top of the wedge-shaped block one. As the inclined panel moves down along the inclined groove, wedge-shaped teeth one and wedge-shaped teeth two cooperate.

[0012] The beneficial effects of this invention are: (1) When the battery pack is subjected to impact and bumps, the battery pack pushes the piezoelectric ceramic sensor plate and the inclined plate, causing the slider on the inclined plate to slide along the inclined groove on the base. The buffer spring is compressed, thereby buffering the impact force of the battery pack, improving the buffering capacity of the end plate frame, and preventing the battery pack from squeezing the battery pack housing through the end plate frame, causing the housing to undergo irreversible deformation, thus improving the stability and safety of the battery pack in the vibration environment. Furthermore, when the impact force on the battery pack is large, the battery pack continuously pushes the inclined panel, and the slider on the inclined panel continues to slide along the inclined groove on the base. At this time, the inclined panel is pressed down and moves downward. The wedge tooth one at the bottom of the inclined panel cooperates with the wedge tooth two at the top of the wedge block one, thereby suppressing the movement of the base plate and the battery pack on the base plate, preventing the battery pack from hitting the end plate frame, and improving the safety of the battery pack.

[0013] (2) A piezoelectric ceramic sensor board is installed on the inclined panel. By attaching the piezoelectric ceramic sensor board to the battery pack, the piezoelectric ceramic sensor board can monitor the cell stacking voltage in real time under vibration or charging and discharging conditions.

[0014] (3) This application includes a support plate, a honeycomb silicone and a carbon fiber plate from the outside to the inside. The support plate and the end plate frame are made of metal materials, which provide high-strength support for this application. The honeycomb silicone is used to buffer vibration and impact. The purpose of the carbon fiber plate built into the end plate frame is to enhance the overall rigidity of the end plate frame and reduce its weight. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is an exploded view of the overall structure of the present invention.

[0018] Figure 3 for Figure 2 Enlarged view of the structure of part A.

[0019] Figure 4 This is a front view of the overall structure of the present invention.

[0020] Figure 5 This is a cross-sectional view of the overall structure of the present invention.

[0021] Figure 6 for Figure 5 Enlarged view of the structure of part B.

[0022] The following are labeled in the diagram: 1. Base plate; 2. End plate frame; 3. Connecting assembly; 301. External block; 302. Strip groove; 303. Guide rod; 4. Base platform; 5. Piezoelectric ceramic sensor plate; 6. Inclined panel; 7. Wedge structure; 701. Wedge block one; 702. Wedge block two; 703. Guide groove; 704. Guide post; 705. Wedge tooth one; 706. Wedge tooth two; 8. Buffer structure; 801. Inclined groove; 802. Slider; 803. Buffer spring; 9. Carbon fiber plate; 10. Honeycomb silicone; 11. Support plate. Detailed Implementation

[0023] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] See Figures 2-6 A shockproof and impact-resistant end plate structure for a lithium iron phosphate battery pack includes a base plate 1 and an end plate frame 2. The base plate 1 supports the battery pack and is connected to the end plate frame 2 via a wedge structure 7. The end plate frame 2 is located on one side of the battery pack, and the base plate 1, end plate frame 2, and battery pack are all located inside the battery box. A base 4 is installed on the side of the end plate frame 2 near the battery pack. The base 4 is connected to a sloping panel 6 via a buffer structure 8. The buffer structure 8 includes a sloping groove 801 formed on the base 4. A slider 802 is installed on the sloping panel 6 and slides inside the sloping groove 801. The slider 802 is connected to the inner wall of the sloping groove 801 via a buffer spring 803.

[0025] Specifically, the wedge structure 7 includes a first wedge block 701 and a second wedge block 702. The first wedge block 701 is installed on the base plate 1, and the second wedge block 702 is installed at the bottom of the end plate frame 2. A guide groove 703 is opened on the second wedge block 702, and a guide post 704 is installed on the first wedge block 701. The guide groove 703 and the guide post 704 are in sliding fit.

[0026] Specifically, wedge-shaped teeth 705 are installed at the bottom of the inclined panel 6, and wedge-shaped teeth 706 are installed at the top of the wedge block 701. As the inclined panel 6 moves down along the inclined groove 801, wedge-shaped teeth 705 and wedge-shaped teeth 706 cooperate.

[0027] It should be noted that the base plate 1, end plate frame 2 and battery pack are all installed inside the battery box (not shown in the attached diagram). The base plate 1 is used to support the battery pack. After the battery pack is fixed on the base plate 1, it is placed into the battery box. The end plate frame 2 is fixed to the inner wall of the battery box and is located on one side of the battery pack.

[0028] The base plate 1 is connected to the end plate frame 2 through the wedge structure 7. The guide post 704 on the wedge block 701 can be inserted into the guide groove 703. Under vibration environment, the wedge-shaped fit between the wedge block 701 and the guide groove 703 can automatically compensate for the assembly gap, prevent the battery pack from loosening, and ensure long-term stable connection.

[0029] When the battery pack is subjected to impact and bumps, the battery pack pushes the piezoelectric ceramic sensor plate 5 and the inclined plate 6, causing the slider 802 on the inclined plate 6 to slide along the inclined groove 801 on the base 4. The buffer spring 803 is compressed, thereby buffering the impact force of the battery pack, improving the buffering capacity of the end plate frame 2, and preventing the battery pack from squeezing the battery pack housing through the end plate frame 2, which would cause irreversible deformation of the housing, thus improving the stability and safety of the battery pack in a vibration environment.

[0030] Furthermore, when the impact force on the battery pack is large, the battery pack continuously pushes the inclined panel 6, and the slider 802 on the inclined panel 6 continuously slides along the inclined groove 801 on the base 4. At this time, the inclined panel 6 is pressed down and moves downward, see [reference]. Figure 6 By engaging the wedge-shaped teeth 705 at the bottom of the inclined panel 6 with the wedge-shaped teeth 706 at the top of the wedge block 701, the movement of the base plate 1 and the battery pack on the base plate 1 is suppressed, thus preventing the battery pack from colliding with the end plate frame 2 and improving the safety of the battery pack.

[0031] See Figures 1-2 The piezoelectric ceramic sensor plate 5 is installed on the inclined panel 6, and the battery pack is attached to the piezoelectric ceramic sensor plate 5.

[0032] It should be noted that a piezoelectric ceramic sensor plate 5 is installed on the inclined panel 6. By attaching the piezoelectric ceramic sensor plate 5 to the battery pack, the piezoelectric ceramic sensor plate 5 can monitor the cell stacking voltage in real time under vibration or charging and discharging conditions.

[0033] See Figures 1-3 The end plate frame 2 has a built-in carbon fiber plate 9. The end plate frame 2 is installed with a support plate 11, a honeycomb silicone 10 and a carbon fiber plate 9 from the outside to the inside. The support plate 11 is connected to the end plate frame 2 through a connecting component 3.

[0034] Specifically, the connecting component 3 includes an external block 301 mounted on the end plate frame 2, with a strip groove 302 formed on the external block 301, and a guide rod 303 mounted on the support plate 11, the guide rod 303 being inserted into the strip groove 302.

[0035] It should be noted that this application includes, from the outside to the inside, a support plate 11 and a honeycomb silicone 10. The support plate 11 and the end plate frame 2 are made of metal, providing high-strength support for this application. The honeycomb silicone 10 is used to buffer vibration and impact. The purpose of the carbon fiber plate 9 built into the end plate frame 2 is to enhance the overall rigidity of the end plate frame 2 and reduce its weight. When the end plate frame 2 is impacted, the honeycomb silicone 10 is compressed, and the guide rod 303 on the support plate 11 slides in the strip groove 302 inside the outer block 301. After the impact ends, the support plate 11 and the guide rod 303 return to their original positions.

[0036] The implementation principle of this invention is as follows: The base plate 1, end plate frame 2, and battery pack are all installed inside the battery box (not shown in the attached diagram). The base plate 1 is used to support the battery pack. After the battery pack is fixed on the base plate 1, it is placed into the battery box. The end plate frame 2 is fixed to the inner wall of the battery box and is located on one side of the battery pack.

[0037] The base plate 1 is connected to the end plate frame 2 through the wedge structure 7. The guide post 704 on the wedge block 701 can be inserted into the guide groove 703. Under vibration environment, the wedge-shaped fit between the wedge block 701 and the guide groove 703 can automatically compensate for the assembly gap, prevent the battery pack from loosening, and ensure long-term stable connection.

[0038] When the battery pack is subjected to impact and bumps, the battery pack pushes the piezoelectric ceramic sensor plate 5 and the inclined plate 6, causing the slider 802 on the inclined plate 6 to slide along the inclined groove 801 on the base 4. The buffer spring 803 is compressed, thereby buffering the impact force of the battery pack, improving the buffering capacity of the end plate frame 2, and preventing the battery pack from squeezing the battery pack housing through the end plate frame 2, which would cause irreversible deformation of the housing, thus improving the stability and safety of the battery pack in a vibration environment.

[0039] Furthermore, when the impact force on the battery pack is large, the battery pack continuously pushes the inclined panel 6, and the slider 802 on the inclined panel 6 continuously slides along the inclined groove 801 on the base 4. At this time, the inclined panel 6 is pressed down and moves downward, see [reference]. Figure 6By engaging the wedge-shaped teeth 705 at the bottom of the inclined panel 6 with the wedge-shaped teeth 706 at the top of the wedge block 701, the movement of the base plate 1 and the battery pack on the base plate 1 is suppressed, thus preventing the battery pack from colliding with the end plate frame 2 and improving the safety of the battery pack.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A shock-resistant and impact-resistant end plate structure for a lithium iron phosphate battery pack, characterized in that: It includes a base plate (1) and an end plate frame (2). The base plate (1) supports the battery pack. The base plate (1) is connected to the end plate frame (2) through a wedge structure (7). The end plate frame (2) is located on one side of the battery pack. The base plate (1), the end plate frame (2) and the battery pack are all located inside the battery box. The end plate frame (2) is mounted on a base (4) near the battery pack side. The base (4) is connected to the inclined plate (6) through a buffer structure (8). The buffer structure (8) includes an inclined groove (801) opened on the base (4). A slider (802) is installed on the inclined plate (6). The slider (802) slides inside the inclined groove (801). The slider (802) is connected to the inner wall of the inclined groove (801) through a buffer spring (803).

2. The shock-resistant and impact-resistant end plate structure of a lithium iron phosphate battery pack according to claim 1, characterized in that: The piezoelectric ceramic sensor plate (5) is installed on the inclined panel (6), and the battery pack is attached to the piezoelectric ceramic sensor plate (5).

3. The shock-resistant and impact-resistant end plate structure of a lithium iron phosphate battery pack according to claim 2, characterized in that: The end plate frame (2) has a built-in carbon fiber plate (9). The end plate frame (2) is installed with a support plate (11), a honeycomb silicone (10) and a carbon fiber plate (9) from the outside to the inside. The support plate (11) is connected to the end plate frame (2) through a connecting component (3).

4. The shock-resistant and impact-resistant end plate structure of a lithium iron phosphate battery pack according to claim 3, characterized in that: The connecting assembly (3) includes an external block (301) mounted on the end plate frame (2), a strip groove (302) is formed on the external block (301), and a guide rod (303) is mounted on the support plate (11), with the guide rod (303) inserted into the strip groove (302).

5. The shock-resistant and impact-resistant end plate structure of a lithium iron phosphate battery pack according to claim 1, characterized in that: The wedge structure (7) includes a first wedge block (701) and a second wedge block (702). The first wedge block (701) is installed on the base plate (1), and the second wedge block (702) is installed at the bottom of the end plate frame (2). A guide groove (703) is opened on the second wedge block (702), and a guide post (704) is installed on the first wedge block (701). The guide groove (703) and the guide post (704) are in sliding fit.

6. The shock-resistant and impact-resistant end plate structure of a lithium iron phosphate battery pack according to claim 5, characterized in that: The bottom of the inclined panel (6) is equipped with a wedge tooth 1 (705), and the top of the wedge block 1 (701) is equipped with a wedge tooth 2 (706). As the inclined panel (6) moves down along the inclined groove (801), the wedge tooth 1 (705) and the wedge tooth 2 (706) cooperate.

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