A single fault implementation device for lithium ion battery pack of electric bicycle

Abstract

The utility model discloses a single fault implementation device of lithium ion battery pack for electric bicycle relates to battery safety and electric performance test technical field. Including support, fixer and press type probe, the top of press type probe is externally connected with ammeter through lead, and the bottom is equipped with the needle body of contact with battery; The support includes support screw rod and probe fixing base, and the probe fixing base is fixedly installed on the upper portion of support screw rod, and the fixer is installed on the position below probe fixing base on support screw rod, and the fixer can move along the height direction of support screw rod, and press type probe is installed on probe fixing base, and press type probe can move along the horizontal direction of probe fixing base. The utility model discloses can realize the demand of safety, convenient in the single fault test process of lithium ion battery pack for electric bicycle, is applicable to different battery pack protection board, avoids manual welding, and the installation is convenient, safe and efficient.

Description

Technical Field

[0001] This utility model relates to the field of battery safety and electrical performance testing technology, specifically to a single fault implementation device for lithium-ion battery packs used in electric bicycles. Background Technology

[0002] With the widespread use of electric bicycles, the safety of their core power source—lithium-ion battery packs—is receiving increasing attention. Battery packs may experience single faults such as short circuits and overcurrents during use. If these faults are not detected and assessed promptly and effectively, they can easily lead to serious accidents such as thermal runaway, fire, or even explosion. Therefore, conducting standardized and reliable single-fault tests is of great significance for ensuring the safety of batteries throughout their entire lifecycle.

[0003] Currently, domestic standards, such as GB43854 "Safety Technical Specification for Lithium-ion Batteries for Electric Bicycles," require safety performance testing of battery packs under single-fault conditions. Traditional testing methods often rely on manual soldering of leads, which is extremely inconvenient to operate, time-consuming, and inefficient; poor soldering can affect measurement results; and the high risk of soldering can easily damage the battery management system (BMS) and electronic components, causing short circuits and other risks, resulting in irreversible damage to the battery pack. Furthermore, manual intervention can easily trigger secondary risks such as thermal runaway.

[0004] Therefore, it can be seen that current single-fault testing of electric bicycle battery packs mainly relies on manual operation, which has the following technical pain points: First, manual soldering is inefficient and inconsistent, requiring manual soldering of leads for different battery protection board layouts. Test results are greatly affected by the operator's skill, making it difficult to guarantee repeatability and comparability. Second, it is easy to damage the battery management system (BMS). The high temperature and physical contact during the soldering process may damage the BMS circuit board or electronic components, affecting the accuracy of the test and even introducing additional faults. Third, it poses a high safety risk. Direct manual contact with live parts can easily cause short circuits or thermal runaway, posing a threat to the operator, and it is difficult to control the instantaneous state of the fault. Fourth, it lacks adaptability. The protection board size and pin layout of different battery pack models vary greatly. Traditional methods lack universal fixtures, requiring frequent customization of tooling, which is costly and inflexible.

[0005] Therefore, developing a standardized, easy-to-operate, efficient, and safe fault simulation device has become an urgent need for the industry. Utility Model Content

[0006] The main purpose of this utility model is to provide a single fault implementation device for lithium-ion battery packs for electric bicycles, so as to overcome the problems of low efficiency, poor consistency and unsafety in the existing technology.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A single fault implementation device for a lithium-ion battery pack for electric bicycles includes a bracket, a fixture, and a press-type probe. The top of the press-type probe is connected to an ammeter via a lead wire, and the bottom is provided with a needle body that contacts the battery. The bracket includes a support screw and a probe holder. The probe holder is fixedly installed on the upper part of the support screw. The retainer is installed on the support screw at a position below the probe holder. The retainer can move along the height direction of the support screw. The press-type probe is installed on the probe holder and can move along the horizontal direction of the probe holder.

[0008] Furthermore, the bracket also includes a support base, the top of which is provided with a first threaded hole, and the bottom of the support screw is screwed onto the support base through the first threaded hole.

[0009] Furthermore, the probe holder is provided with a horizontal guide groove, and an internal guide rod is slidably disposed in the horizontal guide groove. The internal guide rod is provided with a second threaded hole, and the press-type probe is installed on the internal guide rod through the second threaded hole.

[0010] Furthermore, the probe holder has a third threaded hole on its side, and a screw for fixing the moving position of the built-in guide rod is installed in the third threaded hole.

[0011] Furthermore, the press-type probe includes a needle body, a spring, a sleeve, and a butterfly handle. The lower part of the butterfly handle is provided with a threaded portion, which is screwed into the second threaded hole. The top of the sleeve is connected to the bottom of the butterfly handle. The spring is sleeved on the outside of the needle body. The top of the needle body is provided with a chuck. The bottom of the sleeve is sleeved on the chuck, and the chuck is slidably connected to the sleeve.

[0012] Furthermore, the top of the butterfly handle is provided with a socket for connecting a lead wire.

[0013] Furthermore, the needle body, sleeve, and butterfly handle are all made of metal, while the built-in guide rod is made of ABS plastic.

[0014] Furthermore, the fixture includes an adjustable clamp and a fixed clamp. The end of the adjustable clamp is provided with a fourth threaded hole, and a flat-head handle screw is installed in the fourth threaded hole. Both sides of the adjustable clamp and the fixed clamp are provided with lugs, and the lugs are provided with connecting holes. Bolts are installed in the connecting holes to fasten the adjustable clamp and the fixed clamp together.

[0015] Furthermore, a clamping pad is embedded in the inner end of the handle screw near the support screw.

[0016] Furthermore, the fixing clamp adopts an L-shaped plate structure, including a horizontal part and a vertical part connected at 90°. The vertical part is connected to the adjustable clamp, and the bottom surface of the horizontal part abuts against the top of the battery. The bottom of the battery is placed on the support base.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) Through the press-type probe design, non-welding contact is achieved, avoiding thermal damage and physical damage to the battery; (2) Through the design of the adjustable clamp, the retainer can move along the height direction of the support screw, and the press probe can move along the horizontal direction of the probe fixing seat, so as to adapt to different battery pack sizes; (3) By setting up an ammeter for real-time monitoring, the setting value of the DC source current can be adjusted in a timely manner according to the actual value of the ammeter, thereby reducing the impact of small errors on the measurement results. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the bracket and the press-type probe after assembly.

[0020] Figure 3 This is a schematic diagram of the structure of the fixator of this utility model.

[0021] Explanation of reference numerals in the attached diagram: 1-bracket, 2-fixer, 3-press probe, 4-ammeter, 11-support base, 12-support screw, 13-probe fixing base, 132-built-in guide rod, 133-screw, 21-adjusting clamp plate, 22-fixing clamp plate, 211-handle screw, 212-clamping pad, 31-needle body, 32-spring, 33-sleeve, 34-butterfly handle. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0023] Combination Figures 1 to 3 This embodiment provides a single fault implementation device for lithium-ion battery packs for electric bicycles, including a bracket 1, a fixture 2, and a press-type probe 3. The top of the press-type probe 3 is connected to an ammeter 4 via a lead wire, and the bottom is provided with a needle body 31 that contacts the battery.

[0024] In this embodiment, the bracket 1 includes a support base 11, a support screw 12, and a probe fixing base 13. The top of the support base 11 is provided with a first threaded hole, and the bottom of the support screw 12 is screwed onto the support base 11 through the first threaded hole. The probe fixing base 13 is fixedly installed on the upper part of the support screw 12. The retainer 2 is installed on the support screw 12 at a position below the probe fixing base 13. The retainer 2 can move along the height direction of the support screw 12. The press-type probe 3 is installed on the probe fixing base 13, and the press-type probe 3 can move along the horizontal direction of the probe fixing base 13.

[0025] In this embodiment, the probe holder 13 is provided with a horizontal guide groove, and an internal guide rod 132 is slidably arranged in the horizontal guide groove. The internal guide rod 132 is provided with a second threaded hole, and the press-type probe 3 is installed on the internal guide rod 132 through the second threaded hole.

[0026] The press-type probe 3 includes a needle body 31, a spring 32, a sleeve 33, and a butterfly handle 34. The lower part of the butterfly handle 34 has a threaded portion that screws into a second threaded hole. The top of the sleeve 33 is connected to the bottom of the butterfly handle 34. The spring 32 is sleeved on the outside of the needle body 31. The top of the needle body 31 has a chuck, and the bottom of the sleeve 33 is sleeved on the chuck, with the chuck and sleeve 33 slidably connected. The top of the butterfly handle 34 has a socket for connecting a lead wire. When the butterfly handle rotates downwards, it compresses the spring to prevent excessive contact pressure.

[0027] In a further embodiment, the probe holder 13 has a third threaded hole on its side, and a screw 133 for fixing the moving position of the built-in guide rod 132 is installed in the third threaded hole.

[0028] In a further embodiment, the needle body 31, sleeve 33, and butterfly handle 34 are all made of metal, while the built-in guide rod 132 is made of ABS plastic. The built-in guide rod 132, made of ABS plastic, has the advantages of corrosion resistance and high temperature resistance. Its high hardness and flexibility provide excellent support and insulation, preventing battery short circuits during operation.

[0029] In this embodiment, the fixture 2 includes an adjustable clamp 21 and a fixed clamp 22. The end of the adjustable clamp 21 is provided with a fourth threaded hole, and a flat-head handle screw 211 is installed in the fourth threaded hole. Both sides of the adjustable clamp 21 and the fixed clamp 22 are provided with lugs, and the lugs are provided with connecting holes. Bolts are installed in the connecting holes to fasten the adjustable clamp 21 and the fixed clamp 22 together.

[0030] In a further embodiment, a clamping washer 212 is embedded in the inner end of the handle screw 211 near the support screw 12. The clamping washer 212 is made of rubber, and the clamping washer 212 can provide a certain degree of protection to the outer wall of the support screw 12.

[0031] In a further embodiment, the fixing clamp 22 adopts an L-shaped plate structure, including a horizontal part and a vertical part connected at 90°. The vertical part is connected to the adjustable clamp 21, and the bottom surface of the horizontal part abuts against the top of the battery. The bottom of the battery is placed on the support base 11. With this design, the horizontal part of the fixing clamp 22 and the support base 11 limit the position of the battery and prevent the battery from grounding.

[0032] This utility model provides a fault detection device that integrates mechanical fixing, electrical contact, and current monitoring. Through the design of a press-type probe combined with an adjustable clamp, it achieves non-welded contact, avoiding thermal and physical damage. It offers the advantages of rapid adaptation to different battery pack sizes and is safe and reliable. The contact pressure is controlled by a butterfly handle to ensure electrical connection stability, enabling real-time monitoring. Direct connection to an ammeter facilitates real-time acquisition and analysis of fault current. This device fills the gaps in safety, versatility, and operability of existing testing methods, providing key technical support for standardized safety testing of lithium-ion battery packs for electric bicycles.

[0033] Working principle: Place the battery in the appropriate position on the support base 11. Rotate the support screw 12 to change the position of the probe fixing base 13 and the press-type probe 3, so that the position of the needle body 31 is aligned with the position above the fault point on the battery protection board. Adjust the handle screw 211 of the adjustable clamp 21 on the support screw 12 to lock the position of the retainer 2 and the support screw 12. At the same time, use the fixing clamp 22 to limit the battery pack. Then tighten the butterfly handle 34 to make the needle body 31 move downward and make close contact with the fault point of the battery pack. Follow the same method to align, fix and contact the needle body 31 with the other end of the fault point. After the two leads of the battery pack are in close contact with the needle body 31, insert the two leads of the ammeter 4 into the sockets above the two butterfly handles 34 respectively to observe the current during the test. During the tightening process, the rotating support screw 12 can adjust the direction of the probe fixing seat 13. The fixing device 2 can move along the height direction. The horizontal guide groove and the built-in guide rod 132 can adjust the horizontal distance of the needle body 31. The above settings can adapt to the connection of batteries of different sizes and battery pins at different positions.

[0034] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A single fault implementation device for lithium-ion battery packs used in electric bicycles, characterized in that, It includes a bracket (1), a fixture (2) and a press-type probe (3). The top of the press-type probe (3) is connected to an ammeter (4) via a lead wire, and the bottom is provided with a needle body (31) that contacts the battery. The bracket (1) includes a support screw (12) and a probe holder (13). The probe holder (13) is fixedly installed on the upper part of the support screw (12). The fixture (2) is installed on the support screw (12) at a position below the probe holder (13). The fixture (2) can move along the height direction of the support screw (12). The press-type probe (3) is installed on the probe holder (13) and can move along the horizontal direction of the probe holder (13).

2. The single fault implementation device for a lithium-ion battery pack for electric bicycles as described in claim 1, characterized in that, The bracket (1) also includes a support base (11), the top of which is provided with a first threaded hole, and the bottom of the support screw (12) is screwed onto the support base (11) through the first threaded hole.

3. A single fault implementation device for a lithium-ion battery pack for electric bicycles as described in claim 1 or 2, characterized in that, The probe holder (13) is provided with a horizontal guide groove, and a built-in guide rod (132) is slidably provided in the horizontal guide groove. The built-in guide rod (132) is provided with a second threaded hole, and the press-type probe (3) is installed on the built-in guide rod (132) through the second threaded hole.

4. The single fault implementation device for lithium-ion battery packs for electric bicycles as described in claim 3, characterized in that, The probe holder (13) has a third threaded hole on its side, and a screw (133) for fixing the moving position of the built-in guide rod (132) is installed in the third threaded hole.

5. A single fault implementation device for a lithium-ion battery pack for electric bicycles as described in claim 3, characterized in that, The press-type probe (3) includes a needle body (31), a spring (32), a sleeve (33), and a butterfly handle (34). The lower part of the butterfly handle (34) is provided with a threaded part, which is screwed into the second threaded hole. The top of the sleeve (33) is connected to the bottom of the butterfly handle (34). The spring (32) is sleeved on the outside of the needle body (31). The top of the needle body (31) is provided with a chuck. The bottom of the sleeve (33) is sleeved on the chuck. The chuck and the sleeve (33) are slidably connected.

6. A single fault implementation device for a lithium-ion battery pack for electric bicycles as described in claim 5, characterized in that, The top of the butterfly handle (34) is provided with a socket for connecting the lead wire.

7. A single fault implementation device for a lithium-ion battery pack for electric bicycles as described in claim 5, characterized in that, The needle body (31), sleeve (33) and butterfly handle (34) are all made of metal, and the built-in guide rod (132) is made of ABS plastic.

8. A single fault implementation device for a lithium-ion battery pack for electric bicycles as described in claim 2, characterized in that, The fixture (2) includes an adjustable clamp (21) and a fixed clamp (22). The end of the adjustable clamp (21) is provided with a fourth threaded hole. A slotted screw (211) is installed in the fourth threaded hole. Both sides of the adjustable clamp (21) and the fixed clamp (22) are provided with lugs. The lugs are provided with connecting holes. Bolts are installed in the connecting holes to fasten the adjustable clamp (21) and the fixed clamp (22) together.

9. A single fault implementation device for a lithium-ion battery pack for electric bicycles as described in claim 8, characterized in that, A washer (212) is embedded in the inner end of the handle screw (211) near the support screw (12).

10. A single fault implementation device for a lithium-ion battery pack for an electric bicycle as described in claim 8, characterized in that, The fixed clamp (22) adopts an L-shaped plate structure, including a horizontal part and a vertical part connected at 90°. The vertical part is connected to the adjustable clamp (21). The bottom surface of the horizontal part abuts against the top of the battery. The bottom of the battery is placed on the support base (11).

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