An expansion detection device for a cylindrical battery cell and a detection method thereof

Abstract

This invention relates to the field of cylindrical battery cell assembly technology, and more particularly to an expansion detection device and method for cylindrical battery cells. The device includes two symmetrically arranged mounting plates, each with a rapid assembly mechanism on an adjacent side. Side mounting brackets are provided on the front and rear sides of each mounting plate. A detection and positioning mechanism is provided between the mounting plates and the rapid assembly mechanism. The rapid assembly mechanism includes several cylindrical mounting brackets disposed inside the mounting plates. This invention achieves real-time monitoring of the expansion of cylindrical battery cell assemblies during use through the expansion detection mechanism. Simultaneously, through the coordinated arrangement of a flexible baffle, an arc-shaped magnetic plate, and a flexible magnetic sleeve, the expansion of the core causes the flexible sleeve to contract. Based on the contact between the annular conductive contact and the conductive sleeve, the degree of expansion is accurately detected. Compared to disassembling the battery cell assembly and then inspecting each cell individually, this invention significantly improves detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of cylindrical battery cell assembly technology, and in particular to an expansion detection device and method for cylindrical battery cells. Background Technology

[0002] With the popularization of electric vehicles, the demand for power batteries has increased significantly. Power batteries are mainly divided into cylindrical batteries, square batteries and pouch batteries. Regardless of the type of power battery, the core will inevitably expand during use. In order to control the risk of core expansion, expansion detection of power batteries is essential.

[0003] When using cylindrical power batteries, multiple cells are assembled in groups. Therefore, before performing expansion testing, the group of cells needs to be removed from the cylindrical mounting frame, and the expansion of each cylindrical cell needs to be tested one by one. This testing efficiency is low and seriously affects the assembly efficiency of the group of cells. Summary of the Invention

[0004] To address the shortcomings of existing technologies that require individual disassembly and testing of cylindrical battery cells, resulting in low testing efficiency, this invention provides an expansion testing device and method for cylindrical battery cells, solving the technical problem of low testing efficiency caused by disassembling and testing groups of cells.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an expansion detection device and detection method for cylindrical battery cells, comprising two symmetrically arranged mounting plates, a rapid assembly mechanism on each adjacent side of the two mounting plates, side mounting brackets on the front and rear sides of the two mounting plates, and a detection positioning mechanism between the mounting plates and the rapid assembly mechanism;

[0006] The rapid assembly mechanism includes several cylindrical mounting brackets disposed inside the mounting plate. Each cylindrical mounting bracket has a cell slot at its center on the side opposite to the mounting plate. The front and right side walls of each cylindrical mounting bracket have two dovetail slots symmetrically formed. The left and rear side walls of each cylindrical mounting bracket are fixedly connected to dovetail bosses. The four corners of the outer side wall of each cylindrical mounting bracket have arc-shaped slots. The four corners of the side wall of each cylindrical mounting bracket near the mounting plate are fixedly connected to four corner bosses. An expansion detection mechanism is provided on the side of the cylindrical mounting bracket opposite to the mounting plate.

[0007] The detection and positioning mechanism includes several positioning discs fixedly installed on one side of the mounting plate. Each positioning disc is sleeved on the outside of the four corner bosses assembled together. Limiting protrusions are fixedly connected to the four corners of the inner sidewall of the positioning disc. The limiting protrusions and the four corner bosses are mutually engaged and adapted. A slot is opened at the center of each positioning disc.

[0008] Preferably, the expansion detection mechanism includes X-shaped positioning plates symmetrically arranged on one side of adjacent positioning disks. Magnetic positioning strips are fixedly installed longitudinally at the four corners of the X-shaped positioning plates. Flexible baffles are fixedly connected between adjacent magnetic positioning strips. Limiting posts are inserted into the top and bottom centers of the X-shaped positioning plates, and the outer ends of the limiting posts are inserted into the inside of the slots.

[0009] The expansion detection mechanism also includes a slide rod fixedly connected to the inner end of the limiting post. The slide rod slides through to the side wall of the X-shaped positioning plate. The inner side of the flexible baffle is provided with a limiting sleeve. A flexible magnetic sleeve is fixedly connected to the center of the limiting sleeve. An arc-shaped magnetic plate is fixedly connected to both the flexible magnetic sleeve and the inner wall of the flexible baffle.

[0010] A piston is slidably mounted on the outer side of the flexible magnetic sleeve and on the inner side of the limiting sleeve. The inner end of the slide rod is fixedly connected to the piston. Conductive sleeves are fixedly connected to the left and right side walls of the limiting sleeve. The slide rod is slidably mounted on the inner side of the conductive sleeve. Multiple sets of annular conductive contacts are fixedly connected to the side wall of the slide rod. The annular conductive contacts are all located on the inner side of the limiting sleeve.

[0011] Preferably, the flexible magnetic sleeve and the arc-shaped magnetic plate have the same magnetism, and a gap is left between the flexible magnetic sleeve and the arc-shaped magnetic plate;

[0012] The resistance of the multiple sets of annular conductive contacts gradually decreases from the outside to the inside, and the slide rod is tightly fitted to the side wall of the conductive sleeve;

[0013] The four corner bosses are made of magnetic material, and the four corner bosses and the arc groove assembled in groups form a circular hole through which the limiting post can pass.

[0014] The sidewall of the flexible baffle is set as an arc plate, and a core is provided between adjacent flexible baffles. The top and bottom of the core are inserted into the inside of the cell slot.

[0015] A detection method for an expansion detection device for cylindrical battery cells includes the following steps:

[0016] S1. When assembling cylindrical cells, firstly, insert the dovetail bosses on the side walls of each cylindrical mounting bracket into the inside of the dovetail groove to connect the cylindrical mounting brackets to each other. Under the action of magnetic attraction, the four corner bosses at the four corners of each cylindrical mounting bracket adhere to each other, so that the four adjacent arc grooves form a round hole. Then, place the four grouped corner bosses on the back side of the cylindrical mounting bracket into the inside of the positioning plate on the inside of the mounting plate. Then, insert the end of the bottom limiting post through the round hole into the slot at the center of the positioning plate, thereby realizing the installation of each X-shaped positioning plate.

[0017] After the S2 and X-shaped positioning plates are installed, the flexible baffles on their side walls form a cylindrical channel. Then, the core is placed inside the cylindrical channel. Next, the cylindrical mounting brackets on the top are assembled into a group, and the cell slots are placed on the top of the core. Then, the mounting plate and detection positioning mechanism on the top of the corresponding core are placed on the top of the core, so that the top limiting post passes through the round hole on the top and is inserted into the slot in the center of the top positioning plate, thereby realizing the assembly of each core.

[0018] S3. When the expansion detection mechanism detects the expansion of the core during operation, when the corresponding core expands, it squeezes the flexible baffle on its side wall, causing the flexible baffle to deform inward. This causes the arc-shaped magnetic plate on the back of the flexible baffle to simultaneously indent. Under the action of magnetic repulsion, the flexible magnetic sleeve contracts, thereby pushing the pistons on both sides to slide along the inner wall of the limiting sleeve, and then causing the slide rod to slide synchronously along the inner side of the conductive sleeve.

[0019] S4. During the expansion detection process when the core is working, when the core expands slightly, the flexible baffle and the arc-shaped magnetic plate will indent slightly, causing the flexible magnetic sleeve to contract slightly. At this time, the piston inside the limiting sleeve will slide slightly, and the annular conductive contact on the outside will contact the conductive sleeve to conduct electricity. The electrical signal generated when the annular conductive contact contacts the conductive sleeve is the expansion within the allowable range of the core.

[0020] S5. When the core expands significantly, the flexible baffle and the arc-shaped magnetic plate indent considerably, causing the flexible magnetic sleeve to contract significantly. At this time, the piston inside the limiting sleeve slides significantly, and the annular conductive contact on the inner side contacts the conductive sleeve and becomes energized. Since the resistance of the annular conductive contact gradually decreases from the outside to the inside, the electrical signal generated when the annular conductive contact contacts the conductive sleeve becomes larger. At this time, the core expands beyond the allowable range. After accurately locating the abnormal core, the cylindrical mounting bracket in the corresponding area is removed, and the abnormal core is taken out and replaced. This effectively improves the expansion detection efficiency of the core and ensures the safety of the core.

[0021] By means of the above technical solution, the present invention provides an expansion detection device and method for cylindrical battery cells, which has at least the following beneficial effects:

[0022] 1. This invention achieves real-time monitoring of the expansion of cylindrical battery cells during use through an expansion detection mechanism. Simultaneously, the coordinated arrangement of a flexible baffle, an arc-shaped magnetic plate, and a flexible magnetic sleeve allows the flexible sleeve to contract when the cell expands, thereby causing the pistons on both sides of the limiting sleeve to slide. Based on the contact between the annular conductive contact and the conductive sleeve, the degree of expansion is accurately detected, significantly improving the detection accuracy of cell expansion. Compared to disassembling the battery cell assembly and inspecting each cell individually, this invention greatly improves detection efficiency.

[0023] 2. This invention enables rapid assembly of cylindrical cells in groups through a rapid grouping mechanism. At the same time, the cooperation between dovetail grooves and dovetail bosses enables rapid installation of multiple cylindrical mounting brackets, achieving the effect of arbitrary pairing and grouping of multiple cylindrical mounting brackets. It has good interchangeability and strong versatility.

[0024] 3. This invention achieves stable positioning of the expansion detection mechanism through a detection and positioning mechanism. At the same time, through the cooperative arrangement between the positioning plate, the limiting protrusion, and the four corner protrusions, the positioning plate is snapped into the top of the cylindrical mounting bracket. During assembly, the limiting post is inserted into the slot to improve the stability of the expansion detection mechanism during operation. This achieves the effect of improving stability during the expansion detection process, reducing detection errors caused by the shaking of the expansion detection mechanism, and further improving the accuracy of the detection results.

[0025] 4. This invention achieves precise positioning of cylindrical cells through the cylindrical channel formed between adjacent X-shaped positioning plates. At the same time, the expansion and deformation of the cell during operation causes different degrees of deformation of adjacent flexible baffles, achieving the effect of precise positioning of faulty cells, avoiding the need to inspect and screen each cell individually, and greatly improving the inspection efficiency.

[0026] 5. The present invention achieves adsorption and positioning of adjacent X-shaped positioning plates by setting magnetic positioning strips on the side wall of the X-shaped positioning plate, ensuring that the flexible baffle is vertically stationary along the longitudinal direction of the cylindrical mounting frame, further reducing the shaking of the X-shaped positioning plate, thereby ensuring the accuracy of cylindrical cell expansion detection. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the mounting plate of the present invention;

[0030] Figure 3 This is a schematic diagram of the three-dimensional structure of the cylindrical mounting frame assembled with the present invention;

[0031] Figure 4 This is a partial structural diagram of the cylindrical mounting bracket of the present invention when assembled.

[0032] Figure 5 This is a schematic diagram of part of the back structure when the cylindrical mounting bracket of the present invention is assembled;

[0033] Figure 6 This is a three-dimensional structural diagram illustrating the positional relationship between the detection and positioning mechanism and the expansion detection mechanism of the present invention;

[0034] Figure 7 This is a schematic diagram of the expansion detection mechanism of the present invention in its assembled state.

[0035] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point A in the middle;

[0036] Figure 9 This is a three-dimensional structural diagram of the expansion detection mechanism of the present invention;

[0037] Figure 10 This is a three-dimensional cross-sectional view of the internal structure of the expansion detection mechanism of the present invention;

[0038] Figure 11 This is a three-dimensional cross-sectional view of the internal structure of the limiting sleeve of the present invention.

[0039] In the diagram: 1. Mounting plate; 2. Side mounting bracket; 3. Quick assembly mechanism; 30. Cylindrical mounting bracket; 31. Cell slot; 32. Dovetail slot; 33. Dovetail boss; 34. Arc-shaped slot; 35. Four corner bosses; 4. Core; 5. Detection and positioning mechanism; 50. Positioning plate; 51. Limiting protrusion; 52. Slot; 6. Expansion detection mechanism; 60. X-shaped positioning plate; 61. Flexible baffle; 62. Magnetic positioning strip; 63. Limiting post; 64. Slide rod; 65. Limiting sleeve; 66. Flexible magnetic sleeve; 67. Arc-shaped magnetic plate; 68. Conductive sleeve; 69. Annular conductive contact; 610. Piston. Detailed Implementation

[0040] 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.

[0041] Example 1

[0042] Please refer to Figures 1-8An expansion detection device and detection method for cylindrical battery cells include two symmetrically arranged mounting plates 1. A rapid assembly mechanism 3 is provided on each adjacent side of the two mounting plates 1. Side mounting frames 2 are provided on the front and rear sides of the two mounting plates 1. The side mounting frames 2 are used to position the top and bottom mounting plates 1. A detection positioning mechanism 5 is provided between the mounting plates 1 and the rapid assembly mechanism 3.

[0043] The rapid assembly mechanism 3 includes several cylindrical mounting brackets 30 disposed inside the mounting plate 1. Each cylindrical mounting bracket 30 has a cell slot 31 at its center on the side facing away from the mounting plate 1. Two dovetail grooves 32 are symmetrically formed on the front and right side walls of each cylindrical mounting bracket 30. Dovetail bosses 33 are fixedly connected to the left and rear side walls of each cylindrical mounting bracket 30. Arc-shaped grooves 34 are formed at the four corners of the outer side wall of each cylindrical mounting bracket 30. Four corner bosses 35 are fixedly connected to the four corners of the side wall of each cylindrical mounting bracket 30 near the mounting plate 1. An expansion detection mechanism 6 is provided on the side of each cylindrical mounting bracket 30 facing away from the mounting plate 1. During cylindrical cell assembly, the dovetail bosses 33 on the side walls of each cylindrical mounting bracket 30 are first inserted into the dovetail grooves 32 to connect the cylindrical mounting brackets 30 to each other. Under the action of magnetic attraction, the four corner bosses 35 at the four corners of each cylindrical mounting bracket 30 adhere to each other, thereby forming a circular hole with four adjacent arc grooves 34. Then, the four corner bosses 35 of the grouped cylindrical mounting brackets 30 are placed inside the positioning plate 50 on the inner side of the mounting plate 1. Then, the end of the bottom limiting post 63 is inserted into the slot 52 at the center of the positioning plate 50 through the circular hole, thereby realizing the installation of each X-shaped positioning plate 60. The rapid assembly mechanism 3 realizes the rapid assembly of the grouped cylindrical cells. At the same time, the cooperation between the dovetail groove 32 and the dovetail boss 33 realizes the rapid installation of multiple cylindrical mounting brackets 30, achieving the effect of arbitrary pairing and grouping of multiple cylindrical mounting brackets 30, with good interchangeability and strong versatility.

[0044] The detection and positioning mechanism 5 includes several positioning discs 50 fixedly installed on one side of the mounting plate 1. Each positioning disc 50 is sleeved on the outside of the four corner bosses 35 assembled in the assembly. Limiting protrusions 51 are fixedly connected to the four corners of the inner wall of each positioning disc 50. The limiting protrusions 51 and the four corner bosses 35 are mutually engaged and adapted. Each positioning disc 50 has a slot 52 at its center. The detection and positioning mechanism 5 achieves stable positioning of the expansion detection mechanism 6. Simultaneously, through the cooperation between the positioning discs 50, the limiting protrusions 51, and the four corner bosses 35, the positioning discs 50 are secured to the top of the cylindrical mounting bracket 30. During assembly, limiting posts 63 are inserted into the slots 52 to improve the position of the expansion detection mechanism 6. The stability during operation is improved, which reduces the detection error caused by the shaking of the expansion detection mechanism 6 and further improves the accuracy of the detection results. After the X-shaped positioning plate 60 is installed, the flexible baffle 61 on its side wall forms a cylindrical channel. Then, the core 4 is placed inside the cylindrical channel. Next, the cylindrical mounting brackets 30 on the top are assembled into a group, and the cell slots 31 are placed on the top of the core 4. Then, the mounting plate 1 and the detection positioning mechanism 5 on the top of the corresponding core 4 are placed on top, so that the top limiting post 63 passes through the round hole on the top and is inserted into the slot 52 in the center of the top positioning plate 50, thereby realizing the assembly of each core 4.

[0045] Example 2

[0046] Please refer to Figures 9-11 This embodiment is basically the same as Embodiment 1. This embodiment is made on the basis of Embodiment 1 and has the same beneficial effects as Embodiment 1. The same parts can be referred to each other, and will not be described in detail here.

[0047] The expansion detection mechanism 6 includes X-shaped positioning plates 60 symmetrically arranged on one side of adjacent positioning disks 50. Magnetic positioning strips 62 are fixedly installed longitudinally at the four corners of the X-shaped positioning plates 60. The magnetic positioning strips 62 on the sidewalls of the X-shaped positioning plates 60 achieve adsorption and positioning of adjacent X-shaped positioning plates 60, ensuring the vertical static placement of the flexible baffles 61 along the longitudinal direction of the cylindrical mounting frame 30, further reducing the shaking of the X-shaped positioning plates 60, thereby ensuring the expansion detection accuracy of the cylindrical battery cell. Flexible baffles 61 are fixedly connected between adjacent magnetic positioning strips 62. The top of the X-shaped positioning plate 60... Limiting posts 63 are inserted into both the bottom center and the outer ends of the limiting posts 63 are inserted into the inside of the slot 52. When the expansion detection mechanism 6 detects the expansion of the core 4 during operation, when the corresponding core 4 expands, it squeezes the flexible baffle 61 on its side wall, causing the flexible baffle 61 to deform inward, which in turn causes the arc-shaped magnetic plate 67 on the back of the flexible baffle 61 to simultaneously indent. Under the action of magnetic repulsion, the flexible magnetic sleeve 66 contracts, which pushes the pistons 610 on both sides to slide along the inner wall of the limiting sleeve 65, which in turn causes the slide rod 64 to slide synchronously along the inner side of the conductive sleeve 68.

[0048] As a preferred technical solution in this embodiment, the expansion detection mechanism 6 also includes a slide rod 64 fixedly connected to the inner end of the limiting post 63. The slide rod 64 slides through to the side wall of the X-shaped positioning plate 60. A limiting sleeve 65 is provided on the inner side of the flexible baffle 61. A flexible magnetic sleeve 66 is fixedly connected to the center of the limiting sleeve 65. An arc-shaped magnetic plate 67 is fixedly connected to both the flexible magnetic sleeve 66 and the inner wall of the flexible baffle 61.

[0049] As a preferred technical solution in this embodiment, pistons 610 are slidably installed on the outer side of the flexible magnetic sleeve 66 and on the inner side of the limiting sleeve 65. The inner end of the slide rod 64 is fixedly connected to the piston 610. Conductive sleeves 68 are fixedly connected to both the left and right side walls of the limiting sleeve 65. The slide rod 64 is slidably installed on the inner side of the conductive sleeve 68. Multiple sets of annular conductive contacts 69 are fixedly connected to the side walls of the slide rod 64. The annular conductive contacts 69 are all located on the inner side of the limiting sleeve 65. During the detection expansion process when the core 4 is working, when the core 4 expands slightly, the flexible baffle 61 and the arc-shaped magnetic plate 67 will indent slightly, causing the flexible magnetic sleeve 66 to contract slightly. At this time, the piston 610 inside the limiting sleeve 65 slides slightly, and the annular conductive contacts 69 on the outer side contact the conductive sleeve 68 to conduct electricity. The electrical signal generated when the electrical contact 69 contacts the conductive sleeve 68 indicates the allowable expansion range of the core 4. When the core 4 expands significantly, the flexible baffle 61 and the arc-shaped magnetic plate 67 indent considerably, causing the flexible magnetic sleeve 66 to contract significantly. At this time, the piston 610 inside the limiting sleeve 65 slides significantly, and the annular conductive contact 69 on the inner side contacts the conductive sleeve 68 and is energized. Since the resistance of the annular conductive contact 69 gradually decreases from the outside to the inside, the electrical signal generated when the annular conductive contact 69 contacts the conductive sleeve 68 becomes larger. At this time, the core 4 expands beyond the allowable range. After accurately locating the abnormal core 4, the cylindrical mounting bracket 30 in the corresponding area is removed, and the abnormal core 4 is taken out and replaced, which effectively improves the expansion detection efficiency of the core 4 and ensures the safety of the core 4.

[0050] Example 3

[0051] Please refer to Figures 5-11 This embodiment is basically the same as Embodiment 1. This embodiment is made on the basis of Embodiment 1 and has the same beneficial effects as Embodiment 1. The same parts can be referred to each other, and will not be described in detail here.

[0052] The flexible magnetic sleeve 66 and the arc-shaped magnetic plate 67 maintain the same magnetism. A gap is left between the flexible magnetic sleeve 66 and the arc-shaped magnetic plate 67 to ensure that after the arc-shaped magnetic plate 67 and the flexible baffle 61 are recessed, the flexible magnetic sleeve 66 will shrink under the action of magnetic repulsion, thereby driving the slide rod 64 to slide.

[0053] As a preferred technical solution in this embodiment, the resistance values ​​of the multiple sets of annular conductive contact pieces 69 gradually decrease from the outside to the inside, ensuring that when the core 4 expands significantly, the slide rod 64 slides significantly, and the current increases, so as to realize the early warning when the core 4 expands beyond the allowable range during operation, and replace the faulty core 4 in time. The slide rod 64 is tightly fitted with the side wall of the conductive sleeve 68 to ensure the airtightness between the slide rod 64 and the conductive sleeve 68.

[0054] As a preferred technical solution in this embodiment, the four corner bosses 35 are made of magnetic material. When the cylindrical mounting brackets 30 are assembled in groups, the four corner bosses 35 attract each other. The four corner bosses 35 assembled in groups and the arc grooves 34 form a circular hole through which the limiting post 63 can pass. The circular holes formed by the adjacent arc grooves 34 are just enough for the limiting post 63 to pass through.

[0055] As a preferred technical solution in this embodiment, the sidewall of the flexible baffle 61 is set as an arc plate, and a core 4 is provided between adjacent flexible baffles 61. The top and bottom of the core 4 are inserted into the inside of the cell slot 31. The cylindrical channel formed between adjacent X-shaped positioning plates 60 achieves precise positioning of the cylindrical cell. At the same time, the expansion and deformation of the core 4 during operation drives the adjacent flexible baffles 61 to different degrees of deformation, achieving the effect of precise positioning of the faulty core 4, avoiding the need to inspect and screen the core 4 one by one, and greatly improving the inspection efficiency.

[0056] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0057] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Since the above embodiments are substantially similar to the method embodiments, their descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An expansion detection device for cylindrical battery cells, comprising two symmetrically arranged mounting plates (1), characterized in that: Each of the two mounting plates (1) is provided with a quick assembly mechanism (3) on an adjacent side, and each of the two mounting plates (1) is provided with a side mounting bracket (2) on the front and rear sides. A detection and positioning mechanism (5) is provided between the mounting plate (1) and the quick assembly mechanism (3). The rapid assembly mechanism (3) includes several cylindrical mounting brackets (30) arranged inside the mounting plate (1). Each cylindrical mounting bracket (30) has a cell groove (31) at the center of the side away from the mounting plate (1). The front and right side walls of the cylindrical mounting bracket (30) are symmetrically provided with two dovetail grooves (32). The left and rear side walls of the cylindrical mounting bracket (30) are fixedly connected with dovetail bosses (33). The four corners of the outer side wall of the cylindrical mounting bracket (30) are provided with arc grooves (34). The four corners of the side wall of the cylindrical mounting bracket (30) near the mounting plate (1) are fixedly connected with four corner bosses (35). An expansion detection mechanism (6) is provided on the side of the cylindrical mounting bracket (30) away from the mounting plate (1). The detection and positioning mechanism (5) includes several positioning discs (50) fixedly installed on the side adjacent to the mounting plate (1). The positioning discs (50) are all sleeved on the outside of the four corner bosses (35) assembled together. Limiting protrusions (51) are fixedly connected at the four corners of the inner sidewall of the positioning discs (50). The limiting protrusions (51) and the four corner bosses (35) are mutually engaged and adapted. The center of each positioning disc (50) is provided with a slot (52). The expansion detection mechanism (6) includes X-shaped positioning plates (60) symmetrically arranged on one side of adjacent positioning plates (50). Magnetic positioning strips (62) are fixedly installed longitudinally at the four corners of the X-shaped positioning plates (60). Flexible baffles (61) are fixedly connected between adjacent magnetic positioning strips (62). Limiting posts (63) are inserted into the center of the top and bottom of the X-shaped positioning plates (60). The outer ends of the limiting posts (63) are inserted into the inside of the slots (52).

2. The expansion detection device for cylindrical battery cells according to claim 1, characterized in that: The expansion detection mechanism (6) also includes a slide rod (64) fixedly connected to the inner end of the limiting post (63). The slide rod (64) slides through to the side wall of the X-shaped positioning plate (60). The inner side of the flexible baffle (61) is provided with a limiting sleeve (65). A flexible magnetic sleeve (66) is fixedly connected to the center of the limiting sleeve (65). An arc-shaped magnetic plate (67) is fixedly connected to the inner wall of the flexible baffle (61).

3. The expansion detection device for cylindrical battery cells according to claim 2, characterized in that: A piston (610) is slidably installed on the inner side of the limiting sleeve (65), and the inner end of the slide rod (64) is fixedly connected to the piston (610). Conductive sleeves (68) are fixedly connected to both the left and right side walls of the limiting sleeve (65), and the slide rod (64) is slidably installed on the inner side of the conductive sleeve (68). Multiple sets of annular conductive contacts (69) are fixedly connected to the side wall of the slide rod (64), and the annular conductive contacts (69) are all located on the inner side of the limiting sleeve (65).

4. The expansion detection device for cylindrical battery cells according to claim 2, characterized in that: The flexible magnetic sleeve (66) and the arc-shaped magnetic plate (67) have the same magnetism, and there is a gap between the flexible magnetic sleeve (66) and the arc-shaped magnetic plate (67).

5. The expansion detection device for cylindrical battery cells according to claim 3, characterized in that: The resistance of the multiple sets of annular conductive contacts (69) gradually decreases from the outside to the inside, and the slide rod (64) is tightly fitted to the side wall of the conductive sleeve (68).

6. The expansion detection device for cylindrical battery cells according to claim 1, characterized in that: The four corner bosses (35) are made of magnetic material, and a circular hole is formed between the four corner bosses (35) and the arc groove (34) assembled in groups, through which the limiting post (63) can pass.

7. The expansion detection device for cylindrical battery cells according to claim 1, characterized in that: The sidewall of the flexible baffle (61) is set as an arc plate, and a core (4) is provided between adjacent flexible baffles (61). The top and bottom of the core (4) are inserted into the inside of the cell slot (31).

8. The detection method of the expansion detection device for cylindrical battery cells as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. When assembling cylindrical cells, firstly, insert the dovetail bosses (33) on the side walls of each cylindrical mounting bracket (30) into the inside of the dovetail groove (32) to achieve the splicing of each cylindrical mounting bracket (30). The four corner bosses (35) at the four corners of each cylindrical mounting bracket (30) adhere to each other under the action of magnetic attraction, so that the four adjacent arc grooves (34) form a round hole. Then, place the four grouped four corner bosses (35) on the back side of the grouped cylindrical mounting brackets (30) into the inside of the positioning plate (50) on the inner side of the mounting plate (1). Then, insert the end of the bottom limiting post (63) through the round hole into the slot (52) at the center of the positioning plate (50), thereby realizing the installation of each X-shaped positioning plate (60). S2. After the X-shaped positioning plate (60) is installed, the flexible baffle (61) on its side wall forms a cylindrical channel. Then, the core (4) is placed inside the cylindrical channel. Then, the cylindrical mounting brackets (30) on the top are assembled into a group, and the cell slot (31) is placed on the top of the core (4). After that, the mounting plate (1) and the detection and positioning mechanism (5) on the top of the corresponding core (4) are placed on the top of the core (4), so that the top limiting post (63) passes through the round hole on the top and is inserted into the slot (52) in the center of the positioning plate (50) on the top, thereby realizing the assembly of each core (4). S3. When the expansion detection mechanism (6) detects the expansion of the core (4) during operation, when the corresponding core (4) expands, it squeezes the flexible baffle (61) on its side wall, causing the flexible baffle (61) to deform inward, and causing the arc-shaped magnetic plate (67) on the back of the flexible baffle (61) to simultaneously indent. Under the action of magnetic repulsion, the flexible magnetic sleeve (66) contracts, thereby pushing the pistons (610) on both sides to slide along the inner wall of the limiting sleeve (65), and causing the slide rod (64) to slide synchronously along the inner side of the conductive sleeve (68). S4. During the expansion detection process when the core (4) is working, when the core (4) expands slightly, the flexible baffle (61) and the arc magnetic plate (67) will indent slightly, causing the flexible magnetic sleeve (66) to contract slightly. At this time, the piston (610) inside the limiting sleeve (65) will slide slightly, and the annular conductive contact (69) on the outside and the conductive sleeve (68) will come into contact and be energized. The electrical signal generated when the annular conductive contact (69) comes into contact with the conductive sleeve (68) is the expansion within the allowable range of the core (4). S5. When the core (4) expands significantly, the flexible baffle (61) and the arc-shaped magnetic plate (67) will indent significantly, causing the flexible magnetic sleeve (66) to contract significantly. At this time, the piston (610) inside the limiting sleeve (65) will slide significantly, and the annular conductive contact (69) and the conductive sleeve (68) on the inner side will come into contact and be energized. Since the resistance of the annular conductive contact (69) gradually decreases from the outside to the inside, the electrical signal generated when the annular conductive contact (69) comes into contact with the conductive sleeve (68) will increase. At this time, the core (4) will expand beyond the allowable range. After accurately locating the abnormal core (4), the cylindrical mounting bracket (30) in the corresponding area will be removed, and the abnormal core (4) will be taken out and replaced. This effectively improves the expansion detection efficiency of the core (4) and ensures the safety of the core (4).

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