Battery expansion force detection device

Abstract

The utility model provides a battery expansion force detection device, including a base, a receiving cavity detection mechanism, a top plate, a lifting mechanism, an expansion force detection mechanism, and a controller; the top plate is arranged above the base through the lifting mechanism, a receiving cavity detection mechanism is arranged between the top plate and the base, an expansion force detection mechanism is arranged on the top plate, and the controller is electrically connected with the receiving cavity detection mechanism, the lifting mechanism, and the expansion force detection mechanism. The utility model realizes the automatic clamping and installation of batteries of different thicknesses through the coordinated arrangement of the base, the receiving cavity detection mechanism, the top plate, the lifting mechanism, the expansion force detection mechanism, and the controller, and achieves the effect of constant clamping force, solves the problems of low detection efficiency and unstable clamping force caused by manual adjustment of the clamping mechanism in the prior art, and the arrangement of the controller, the receiving cavity detection mechanism, the lifting mechanism, and the expansion force detection mechanism improves the accuracy of the detection result.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, in particular to a battery expansion force detection device. Background Art

[0002] Lithium-ion batteries have the advantages of high voltage, long life, and no pollution. They are widely used in electric vehicles, medical devices, digital products and other fields, and have broad market prospects. During the charging process of lithium-ion batteries, the anode will expand as lithium ions are embedded, and huge stress will be generated inside the battery. This phenomenon is particularly prominent in the field of power batteries. As lithium-ion batteries are recycled, the thickness of the battery will continue to increase with the expansion force. Once the limit is exceeded, the battery life will be suddenly reduced, and even safety hazards such as distortion, deformation, circuit breaker and explosion may occur. Therefore, the expansion force of the battery is an important parameter of the comprehensive performance of the battery, and the expansion force detection of the battery is an indispensable and important link in the battery design and development process.

[0003] The existing battery expansion force detection device has the following technical defects when in use: when installing and clamping batteries of different thicknesses before testing, the clamping force needs to be manually adjusted, which is time-consuming and labor-intensive, and has low detection efficiency; at the same time, since the expansion forces of batteries of different thicknesses are different during operation, the sizes of the battery accommodating cavities are also different, and it is impossible to ensure that the batteries are in the same force environment, resulting in low accuracy of the detection results. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to improve detection efficiency and accuracy.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] A battery expansion force detection device comprises a base (1), a receiving cavity detection mechanism (2), a top plate (3), a lifting mechanism (4), an expansion force detection mechanism (5), and a controller (6); the top plate (3) is arranged above the base (1) through the lifting mechanism (4), an receiving cavity detection mechanism (2) is arranged between the top plate (3) and the base (1), an expansion force detection mechanism (5) is arranged on the top plate (3), and the controller (6) is electrically connected to the receiving cavity detection mechanism (2), the lifting mechanism (4), and the expansion force detection mechanism (5).

[0007] Beneficial effects: Through the coordinated setting of the base, the accommodating cavity detection mechanism, the top plate, the lifting mechanism, the expansion force detection mechanism and the controller, the automatic clamping and installation of batteries of different thicknesses is realized, and the effect of constant clamping force is achieved, which solves the problems of low detection efficiency and unstable clamping force caused by manual adjustment of the clamping mechanism in the prior art. The setting of the controller, the accommodating cavity detection mechanism, the lifting mechanism and the expansion force detection mechanism improves the accuracy of the detection results.

[0008] Furthermore, the base (1) comprises a bottom plate (11) and a support frame (12); the bottom wall of the bottom plate (11) is fixedly connected to the support frame (12); and the bottom plate (11) and the top plate (3) are supported by a lifting mechanism (4).

[0009] Furthermore, a lifting mechanism (4) is fixed on each of the two sides of the middle of the top plate (3), and the output end of the lifting mechanism (4) passes through the top plate (3) and is fixed to the bottom plate (11); a receiving cavity detection mechanism (2) is fixed at each of the four corners between the top plate (3) and the bottom plate (11); an expansion force detection mechanism (5) is fixed through the middle position of the top wall of the top plate (3), and the expansion force detection mechanism (5) is located between the two lifting mechanisms (4); and a detection top groove (31) and a detection bottom groove (111) are respectively provided at the relative positions of the top plate (3) and the bottom plate (11) below the expansion force detection mechanism (5); and a controller (6) is fixed on one side of the top wall of the top plate (3).

[0010] Furthermore, the accommodating cavity detection mechanism (2) comprises a detection cylinder (21), a slide bar (22), and an accommodating cavity detection assembly (23); the detection cylinder (21) is fixed on the top wall of the base (1); the bottom wall of the top plate (3) is fixedly connected with a slide bar (22) near the detection cylinder (21); the slide bar (22) is slidably mounted inside the detection cylinder (21); a plurality of elastic limiting rings (211) are fixed on the inner side wall of the detection cylinder (21); the elastic limiting rings (211) are arranged at equal intervals along the vertical direction of the inner side wall of the detection cylinder (21); and the bottom of the slide bar (22) is provided with an accommodating cavity detection assembly (23); the accommodating cavity detection assembly (23) cooperates with the elastic limiting ring (211) to realize accurate detection of the size of the battery accommodating cavity.

[0011] Furthermore, the accommodating cavity detection component (23) comprises an elastic limit block (231), a first spring (232), and a first piezoelectric ceramic (233); two movable grooves (221) are symmetrically provided at the bottom of the side wall of the sliding rod (22); elastic limit blocks (231) are movably installed inside the two movable grooves (221); the inner side walls of the elastic limit blocks (231) are fixedly connected to the first spring (232); the other end of the first spring (232) is fixedly connected to the first piezoelectric ceramic (233); and the first piezoelectric ceramic (233) is fixedly installed on the inner wall of the movable groove (221).

[0012] Beneficial effects: Rapid detection of batteries of different thicknesses is achieved through the accommodating cavity detection component. At the same time, accurate detection of the most suitable accommodating cavity size for batteries of different thicknesses is achieved through the coordinated arrangement of the detection tube, the sliding rod, the elastic limit block, the first spring and the first piezoelectric ceramic, thereby improving the accuracy of subsequent expansion force detection.

[0013] Furthermore, adjacent sides of the elastic limiting ring (211) and the elastic limiting block (231) are both arranged as semicircular protrusions, and the distance between the sliding rod (22) and the inner wall of the detection cylinder (21) is smaller than the sum of the radii of the elastic limiting ring (211) and the elastic limiting block (231).

[0014] Beneficial effect: By setting the size of the elastic limit ring and the limit block, it is ensured that when the slide bar moves down along the inside of the detection tube, the elastic limit ring and the elastic limit block are in contact, thereby ensuring the normal operation of the accommodating cavity detection component.

[0015] Furthermore, the expansion force detection mechanism (5) comprises a detection disk (51), an elastic top plate (53), and an expansion force detection component (54); the detection disk (51) is fixed through the middle position of the top wall of the top plate (3); a limiting groove (511) is provided on the bottom wall of the detection disk (51), an elastic top plate (53) is provided on the inner side wall of the limiting groove (511), and an expansion force detection component (54) is fixed between the top of the elastic top plate (53) and the limiting groove (511).

[0016] Furthermore, the expansion force detection mechanism (5) further comprises a connecting sleeve (52), the bottom wall of the limiting groove (511) is fixedly mounted with the connecting sleeve (52), and the inner side wall of the connecting sleeve (52) is fixedly mounted with an elastic top plate (53).

[0017] Furthermore, the expansion force detection component (54) includes an elastic top piece (541), a sleeve (542), a second piezoelectric ceramic (543), and a second spring (544); the elastic top piece (541) is fixedly installed on the top of the elastic top plate (53); the bottom wall of the limiting groove (511) is fixedly connected to the sleeve (542); the elastic top piece (541) is movably installed inside the sleeve (542); the top of the inner wall of the sleeve (542) is fixedly connected to the second piezoelectric ceramic (543); the bottom of the second piezoelectric ceramic (543) is fixedly connected to the second spring (544); and the other end of the second spring (544) is fixedly connected to the top wall of the elastic top piece (541).

[0018] Beneficial effect: Through the coordinated arrangement of the elastic top plate, the sleeve, the second spring and the second piezoelectric ceramic, rapid detection of the battery expansion force is achieved, and the detection result is particularly accurate. It can be widely used in rapid detection of corresponding expansion forces of lithium-ion batteries of different thicknesses.

[0019] Furthermore, the expansion force detection component (54) also includes a support rod (545), and the support rod (545) is fixedly installed on the top wall of the elastic top plate (53) and located on the outer side of the elastic top piece (541). The support rod (545) is inclinedly arranged at equal intervals along the outer circumference of the elastic top piece (541), and the ends of the support rods (545) are fixedly connected to the side walls of the elastic top piece (541).

[0020] Beneficial effect: The lateral force of the elastic top piece is evenly distributed through the elastic top plate and the support rods arranged at equal intervals, so that the second piezoelectric ceramic is subjected to stable force, thereby achieving the effect of providing accurate detection data, and further improving the accuracy of the detection results.

[0021] The advantages of the utility model are:

[0022] The utility model realizes the automatic clamping and installation of batteries of different thicknesses through the coordinated arrangement of the base, the accommodating cavity detection mechanism, the top plate, the lifting mechanism, the expansion force detection mechanism and the controller, thereby achieving the effect of constant clamping force, and solving the problems of low detection efficiency and unstable clamping force caused by manual adjustment of the clamping mechanism in the prior art. The arrangement of the controller, the accommodating cavity detection mechanism, the lifting mechanism and the expansion force detection mechanism improves the accuracy of the detection result.

[0023] The utility model realizes rapid detection of batteries of different thicknesses through a receiving cavity detection component, and simultaneously realizes accurate detection of the most suitable receiving cavity size for batteries of different thicknesses through the coordinated arrangement among the detection tube, the slide rod, the elastic limit block, the first spring and the first piezoelectric ceramic, thereby improving the accuracy of later expansion force detection.

[0024] The utility model ensures that the elastic limiting ring and the elastic limiting block are in contact with each other when the slide bar moves downward inside the detection tube through the size setting of the elastic limiting ring and the limiting block, thereby ensuring the normal operation of the accommodating cavity detection component.

[0025] The utility model realizes rapid detection of battery expansion force through the coordinated arrangement of the elastic top plate, the sleeve, the second spring and the second piezoelectric ceramic. The detection result is particularly accurate and can be widely used in rapid detection of corresponding expansion forces of lithium electronic batteries of different thicknesses.

[0026] The utility model realizes even distribution of lateral force on the elastic top piece through the elastic top plate and support rods arranged at equal intervals, achieves the effect of stabilizing the force on the second piezoelectric ceramic, and then achieves the effect of providing accurate detection data, further improving the accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a three-dimensional diagram of a battery expansion force detection device according to a first embodiment of the utility model;

[0028] Figure 2 It is a front cross-sectional view of the accommodating cavity detection mechanism in the battery expansion force detection device of the first embodiment of the utility model;

[0029] Figure 3 for Figure 2 A magnified view of middle;

[0030] Figure 4 This is an assembly diagram of a slide bar and a receiving cavity detection component in a battery expansion force detection device according to a first embodiment of the utility model;

[0031] Figure 5 It is a three-dimensional diagram of the expansion force detection mechanism in the battery expansion force detection device of the first embodiment of the utility model;

[0032] Figure 6 This is a three-dimensional diagram from another perspective of the expansion force detection mechanism in the battery expansion force detection device of the first embodiment of the utility model;

[0033] Figure 7 It is a front cross-sectional view of the expansion force detection mechanism in the battery expansion force detection device according to the first embodiment of the utility model. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Embodiment 1

[0036] like Figure 1 As shown, this embodiment provides a battery expansion force detection device, including a base 1, a receiving cavity detection mechanism 2, a top plate 3, a lifting mechanism 4, an expansion force detection mechanism 5, and a controller 6;

[0037] like Figure 1 As shown, the base 1 includes a bottom plate 11 and a support frame 12, and the bottom wall of the bottom plate 11 is fixedly connected with the support frame 12, which can improve the stability of the detection device; the bottom plate 11 and the top plate 3 are supported by a lifting mechanism 4, and the lifting mechanism 4 in the example of this embodiment is an electric lifting rod, and an electric lifting rod is fixed on each of the two sides of the middle part of the top plate 3, and the output end of the electric lifting rod passes through the top plate 3 and is fixed to the bottom plate 11; a accommodating cavity detection mechanism 2 is fixed at each of the four corners between the top plate 3 and the bottom plate 11; an expansion force detection mechanism 5 is fixed through the middle position of the top wall of the top plate 3, and the expansion force detection mechanism 5 is located between the two lifting mechanisms 4, and a detection top groove 31 and a detection bottom groove 111 are respectively opened at the relative positions of the top plate 3 and the bottom plate 11 below the expansion force detection mechanism 5; a controller 6 is fixed on one side of the top wall of the top plate 3; the lifting mechanism 4 is turned on by the controller 6, driving the top plate 3 to move downward, and the lithium-ion battery is clamped and fixed by the detection bottom groove 111 and the side wall of the detection top groove 31.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the accommodating cavity detection mechanism 2 includes a detection cylinder 21, a slide bar 22, and an accommodating cavity detection assembly 23. The detection cylinder 21 is fixed on the top wall of the bottom plate 11, and the bottom wall of the top plate 3 near the detection cylinder 21 is fixedly connected with a slide bar 22, and the slide bar 22 is slidably installed inside the detection cylinder 21. As the top plate 3 moves downward, the slide bar 22 moves downward along the inside of the detection cylinder 21; a plurality of elastic limiting rings 211 are fixed on the inner side wall of the detection cylinder 21, and the elastic limiting rings 211 are arranged at equal intervals along the vertical direction of the inner side wall of the detection cylinder 21; the bottom of the slide bar 22 is provided with an accommodating cavity detection assembly 23, and the accommodating cavity detection assembly 23 cooperates with the elastic limiting ring 211 to realize the accurate detection of the size of the battery accommodating cavity; the accommodating cavity detection assembly 23 includes an elastic limiting block 231, a first spring 232, and a first piezoelectric Ceramic 233, two movable grooves 221 are symmetrically provided at the bottom of the side wall of the slide bar 22, and elastic limit blocks 231 are movably installed inside the two movable grooves 221, and the inner side walls of the elastic limit blocks 231 are fixedly connected with first springs 232, and the other end of the first spring 232 is fixedly connected with a first piezoelectric ceramic 233, and the first piezoelectric ceramic 233 is fixedly installed on the inner wall of the movable groove 221; the adjacent sides of the elastic limit ring 211 and the elastic limit block 231 are both set as semicircular protrusions, and the distance between the slide bar 22 and the inner wall of the detection tube 21 is less than the sum of the radii of the elastic limit ring 211 and the elastic limit block 231, ensuring that when the slide bar 22 moves down along the inside of the detection tube 21, the elastic limit ring 211 and the elastic limit block 231 are in contact, thereby ensuring the normal operation of the accommodating cavity detection component 23;

[0039] like Figure 2 , Figure 3 , Figure 4 As shown, as the slide bar 22 moves downward, the elastic limit block 231 located at the bottom of the side wall of the slide bar 22 contacts the elastic limit ring 211, so that the elastic limit blocks 231 on both sides slide along the inside of the movable groove 221, and then squeeze the first spring 232, so that piezoelectric current is generated on both sides of the first piezoelectric ceramic 233; when the expansion force detection mechanism 5 in the middle of the top plate 3 generates an electrical signal, it indicates that the battery clamping is completed at this time, and the lifting mechanism 4 stops working and no longer moves downward. At this time, the elastic limit block 231 is located between the gaps of adjacent elastic limit rings 211, the first spring 232 returns to its original length, and the first piezoelectric ceramic 233 no longer generates a piezoelectric current signal; the automatic clamping and installation of batteries of different thicknesses is realized by the coordinated arrangement between the bottom plate 11, the top plate 3, the lifting mechanism 4 and the detection tube 21, and the effect of constant clamping force is achieved, which solves the problem of low detection efficiency and unstable clamping force caused by manual adjustment of the clamping mechanism in the prior art;

[0040] like Figure 2 , Figure 3 , Figure 4As shown, when the thickness of the battery is relatively small, the downward movement distance between the top plate 3 and the slide bar 22 is relatively large, and the corresponding first piezoelectric ceramic 233 generates multiple current signals. When the thickness of the battery is relatively large, the downward movement distance between the top plate 3 and the slide bar 22 is relatively small, and the corresponding first piezoelectric ceramic 233 generates fewer current signals. Therefore, the optimal accommodation size of the accommodation cavity for batteries of different thicknesses can be accurately simulated according to the number of times the first piezoelectric ceramic 233 generates electrical signals. The accommodation cavity detection component 23 is used to quickly detect batteries of different thicknesses. At the same time, the most suitable accommodation cavity size for batteries of different thicknesses is accurately detected through the matching setting between the detection tube 21, the slide bar 22, the elastic limit block 231, the first spring 232 and the first piezoelectric ceramic 233, thereby improving the accuracy of expansion force detection.

[0041] like Figure 1 , Figure 5 , Figure 6 As shown, the expansion force detection mechanism 5 includes a detection plate 51, a connecting sleeve 52, an elastic top plate 53, and an expansion force detection component 54; the detection plate 51 is fixed through the middle position of the top wall of the top plate 3; a limiting groove 511 is provided on the bottom wall of the detection plate 51, a connecting sleeve 52 is fixedly installed on the bottom wall of the limiting groove 511, an elastic top plate 53 is fixedly installed on the inner side wall of the connecting sleeve 52, and an expansion force detection component 54 is fixed between the top of the elastic top plate 53 and the limiting groove 511;

[0042] like Figure 6 , Figure 7As shown, the expansion force detection component 54 includes an elastic top piece 541, a sleeve 542, a second piezoelectric ceramic 543, a second spring 544, and a support rod 545; the elastic top piece 541 is fixedly installed on the top of the elastic top plate 53, the bottom wall of the limiting groove 511 is fixedly connected with the sleeve 542, the elastic top piece 541 is movably installed inside the sleeve 542, the top of the inner wall of the sleeve 542 is fixedly connected with the second piezoelectric ceramic 543, the bottom of the second piezoelectric ceramic 543 is fixedly connected with the second spring 544, and the other end of the second spring 544 is fixedly connected to the top wall of the elastic top piece 541; the top wall of the elastic top plate 53 and the outside of the elastic top piece 541 are fixedly installed with a support rod 545, and the support rod 545 is moved along the elastic top piece The outer side of 541 is tilted and arranged at equal intervals in the circumferential direction, and the ends of the support rods 545 are fixedly connected to the side walls of the elastic top member 541; the support rods 545 arranged at equal intervals ensure that during the deformation of the elastic top plate 53, the deformation force is evenly transmitted to the elastic top member 541 along the support rods 545, driving the elastic top member 541 to move upward stably, and driving the elastic top plate 53 to deform to different degrees when the batteries of different thicknesses expand during operation. At the same time, the lateral force of the elastic top member 541 is evenly distributed through the elastic top plate 53 and the support rods 545 arranged at equal intervals, so as to achieve the effect of stabilizing the force of the second piezoelectric ceramic 543, thereby achieving the effect of providing accurate detection data, and further improving the accuracy of the detection result;

[0043] like Figure 1 , Figure 4 , Figure 7 As shown, the controller 6 is electrically connected to the lifting mechanism 4, the first piezoelectric ceramic 233, and the second piezoelectric ceramic 543; as the top plate 3 continues to move downward, the elastic top plate 53 contacts the top wall of the battery, thereby causing the elastic top plate 53 to deform, thereby causing the elastic top member 541 to rise, and the second spring 544 to compress. At this time, the second piezoelectric ceramic 543 generates a piezoelectric current. After the second piezoelectric ceramic 543 generates an electrical signal, it indicates that the battery clamping is completed at this time, and the driving controller 6 turns off the lifting mechanism 4 to work; the battery is turned on to make it operate normally, and as the lithium-ion battery continues to expand during operation, the elastic top plate 53 continues to deform. At this time, under the joint action of the elastic top plate 53 and the support rod 545, the elastic top member 541 is driven to rise continuously and stably, and then continues to squeeze the second spring 544. At this time, the piezoelectric current signal recorded on the second piezoelectric ceramic 543 is used to realize the simulation detection of the battery expansion force. The expansion force detection mechanism is used to simulate the pre-stress environment of the battery during operation. At the same time, the elastic top plate 53, the sleeve 542, the second spring 544, and the second piezoelectric ceramic 543 are used to realize the rapid detection of the battery expansion force. The detection result is particularly accurate and can be widely used in the rapid detection of the corresponding expansion force of lithium electronic batteries of different thicknesses.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery expansion force detection device, characterized in that: It comprises a base (1), a receiving cavity detection mechanism (2), a top plate (3), a lifting mechanism (4), an expansion force detection mechanism (5), and a controller (6); The top plate (3) is arranged above the base (1) via a lifting mechanism (4); a receiving cavity detection mechanism (2) is arranged between the top plate (3) and the base (1); an expansion force detection mechanism (5) is arranged on the top plate (3); and the controller (6) is electrically connected to the receiving cavity detection mechanism (2), the lifting mechanism (4), and the expansion force detection mechanism (5).

2. A battery expansion force detection device according to claim 1, characterized in that: The base (1) comprises a bottom plate (11) and a support frame (12); the bottom wall of the bottom plate (11) is fixedly connected to the support frame (12); and the bottom plate (11) and the top plate (3) are supported by a lifting mechanism (4).

3. A battery expansion force detection device according to claim 2, characterized in that: A lifting mechanism (4) is fixed on each of the two sides of the middle of the top plate (3), and the output end of the lifting mechanism (4) passes through the top plate (3) and is fixed to the bottom plate (11); a receiving cavity detection mechanism (2) is fixed at each of the four corners between the top plate (3) and the bottom plate (11); an expansion force detection mechanism (5) is fixed through the middle position of the top wall of the top plate (3), and the expansion force detection mechanism (5) is located between the two lifting mechanisms (4); and a detection top groove (31) and a detection bottom groove (111) are respectively provided at the relative positions of the top plate (3) and the bottom plate (11) below the expansion force detection mechanism (5); and a controller (6) is fixed on one side of the top wall of the top plate (3).

4. A battery expansion force detection device according to claim 1, characterized in that: The accommodating cavity detection mechanism (2) comprises a detection cylinder (21), a slide bar (22), and an accommodating cavity detection assembly (23); the detection cylinder (21) is fixed on the top wall of the base (1); the bottom wall of the top plate (3) is fixedly connected with a slide bar (22) near the detection cylinder (21); the slide bar (22) is slidably mounted inside the detection cylinder (21); a plurality of elastic limiting rings (211) are fixed on the inner side wall of the detection cylinder (21); the elastic limiting rings (211) are arranged at equal intervals along the inner side wall of the detection cylinder (21); and the bottom of the slide bar (22) is provided with an accommodating cavity detection assembly (23); the accommodating cavity detection assembly (23) cooperates with the elastic limiting ring (211) to realize accurate detection of the size of the battery accommodating cavity.

5. A battery expansion force detection device according to claim 4, characterized in that: The accommodating cavity detection component (23) comprises an elastic limit block (231), a first spring (232), and a first piezoelectric ceramic (233); two movable grooves (221) are symmetrically provided at the bottom of the side wall of the sliding rod (22); elastic limit blocks (231) are movably installed inside the two movable grooves (221); the inner side walls of the elastic limit blocks (231) are fixedly connected to the first spring (232); the other end of the first spring (232) is fixedly connected to the first piezoelectric ceramic (233); and the first piezoelectric ceramic (233) is fixedly installed on the inner wall of the movable groove (221).

6. A battery expansion force detection device according to claim 5, characterized in that: The adjacent sides of the elastic limiting ring (211) and the elastic limiting block (231) are both arranged as semicircular protrusions, and the distance between the sliding rod (22) and the inner wall of the detection cylinder (21) is smaller than the sum of the radii of the elastic limiting ring (211) and the elastic limiting block (231).

7. A battery expansion force detection device according to claim 1, characterized in that: The expansion force detection mechanism (5) comprises a detection plate (51), an elastic top plate (53), and an expansion force detection assembly (54); the detection plate (51) is fixed through the middle position of the top wall of the top plate (3); a limiting groove (511) is provided on the bottom wall of the detection plate (51), an elastic top plate (53) is provided on the inner side wall of the limiting groove (511), and an expansion force detection assembly (54) is fixed between the top of the elastic top plate (53) and the limiting groove (511).

8. A battery expansion force detection device according to claim 7, characterized in that: The expansion force detection mechanism (5) further comprises a connecting sleeve (52), the bottom wall of the limiting groove (511) is fixedly mounted with the connecting sleeve (52), and the inner side wall of the connecting sleeve (52) is fixedly mounted with an elastic top plate (53).

9. A battery expansion force detection device according to claim 7, characterized in that: The expansion force detection component (54) includes an elastic top piece (541), a sleeve (542), a second piezoelectric ceramic (543), and a second spring (544); the elastic top piece (541) is fixedly installed on the top of the elastic top plate (53); the bottom wall of the limiting groove (511) is fixedly connected to the sleeve (542); the elastic top piece (541) is movably installed inside the sleeve (542); the top of the inner wall of the sleeve (542) is fixedly connected to the second piezoelectric ceramic (543); the bottom of the second piezoelectric ceramic (543) is fixedly connected to the second spring (544); and the other end of the second spring (544) is fixedly connected to the top wall of the elastic top piece (541).

10. A battery expansion force detection device according to claim 9, characterized in that: The expansion force detection assembly (54) also includes a support rod (545), and the support rod (545) is fixedly installed on the top wall of the elastic top plate (53) and located on the outside of the elastic top piece (541). The support rod (545) is arranged at equal intervals and tilted along the outer circumference of the elastic top piece (541), and the ends of the support rods (545) are fixedly connected to the side walls of the elastic top piece (541).

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