Battery module sampling structure

Abstract

The invention discloses a battery module sampling structure, which comprises a cable main body, a plurality of sampling branches welded on the cable main body and a busbar arranged on a battery module, one end of each sampling branch is welded on the cable main body, and the other end of each sampling branch is fixedly connected with the busbar and is in contact with a battery pole of the battery module. The cable main body is formed by arranging a plurality of flat cables in parallel, and the upper and lower parts of the flat cables are respectively coated with an insulating film to form the flexible flat cable. According to the invention, the plurality of flat cables are arranged in parallel and are coated by the insulating film, so that the condition of short circuit of the battery module caused by the flat cables is avoided, and the whole circuit is protected. Meanwhile, since the sampling signals are transmitted only through the flat cable, the whole processing and manufacturing process is simple, pollutants are not easy to generate in the processing and manufacturing process, the requirement of environmental protection is effectively met, and the corresponding cost expenditure is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field related to power batteries and energy storage batteries, and in particular to a battery module sampling structure. Background Art

[0002] In the existing patent technology document of the utility model "A battery module connection acquisition structure and battery module" (Announcement No. CN214176206U), a battery module connection sampling structure is disclosed, including an integrated busbar, an insulating board, a circuit board, and a connector, wherein the integrated busbar is connected to the positive and negative poles of the battery cell, and the circuit board is connected to the busbar through the sampling terminal, and the voltage and temperature signals on the busbar are collected, and then summarized through the connector at the other end of the circuit board, and uniformly output to the battery management system BMS to complete the battery voltage and temperature signal collection. This method has the following technical problems:

[0003] 1. The core technology of this technical solution is to use flexible circuit boards as signal carriers. At that time, the production of circuit boards required sewage and waste discharge, which was not conducive to environmental protection, and the post-processing cost was high;

[0004] 2. The circuit board structure disclosed in this technical solution cannot effectively absorb the expansion of the battery during long-term use, which will eventually lead to circuit breakage and sampling failure.

[0005] Therefore, the prior art has defects and needs to be improved. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a battery module sampling structure.

[0007] The technical solution of the present invention is as follows: a battery module sampling structure is provided, comprising: a cable main body, a plurality of sampling branches welded to the cable main body, and a busbar arranged on the battery module, one end of the sampling branch is welded to the cable main body, and the other end is connected and fixed to the busbar and contacts with the battery pole of the battery module, the cable main body is composed of a plurality of flat cables placed in parallel, and the upper and lower parts of the flat cables are respectively covered with an insulating film to form a flexible flat cable.

[0008] Furthermore, the thickness of the flat cable is 0.05-0.15 mm.

[0009] Furthermore, the width of the flat cable is 0.5-1.0 mm.

[0010] Furthermore, the sampling branch includes a voltage sampling terminal and a temperature sampling component, and the voltage sampling terminal and the temperature sampling component are electrically connected to the cable body respectively.

[0011] Furthermore, the voltage sampling terminal and / or temperature sampling assembly includes: a terminal body, a plurality of welding pads arranged on the terminal body, and a sampling end arranged at the end of the terminal body, the sampling end is in contact with the battery pole of the battery module, and the insulating film on the cable body is provided with an exposed window area corresponding to the welding pad position on the terminal body, and the welding pad is welded to the cable body through the window area.

[0012] Furthermore, the opening on the pad is a girdle hole, the short diameter of the girdle hole is 0.4-0.7 mm, and the long diameter of the girdle hole is 0.6-1.0 mm.

[0013] Furthermore, a bilateral anti-expansion structure is provided between the terminal body and the sampling end, and the bilateral anti-expansion structure is punched into a three-section structure, and the width of each section of the three-section structure is ≥2.3mm. The three-section structure is connected and distributed in an S shape, and an anti-tear hole is provided at the punching cut, and the aperture of the anti-tear hole is 1.0-5mm.

[0014] Furthermore, an NTC chip is arranged on the sampling end of the temperature sampling component, the outside of the NTC chip is surrounded by an injection molded part, a sealant is coated between the NTC chip and the injection molded part, and a thermal pad is arranged at the bottom of the sampling end, and the thermal pad is in contact with the upper surface of the battery module.

[0015] Furthermore, convex hulls are provided on both sides of the injection molded part, the top surface of the convex hulls is flush with the top surface of the injection molded part, the height of the convex hulls is 0.2-1.0 mm, and the injection molded part is embedded in the inner hole of the busbar and connected to the busbar through the convex hulls;

[0016] Side arms are arranged on both sides of the bottom of the injection molded part, the thickness of the side arms is 0.5-1.5 mm, the side arms are in contact with the bottom surface of the busbar, and a bearing film is arranged between the side arms and the busbar.

[0017] Furthermore, a hot-pressed insulating film is provided between the lower portion of the cable body and the battery module.

[0018] By adopting the above scheme, the present invention places a plurality of flat cables in parallel and then covers them with an insulating film, thereby preventing the flat cables from short-circuiting the battery module and providing protection for the overall circuit. At the same time, since the sampling signal is transmitted only through the flat cables, the overall processing and manufacturing process is simple, and pollutants are not easily generated during the processing and manufacturing process, which effectively meets the requirements of environmental protection and reduces the corresponding cost expenditure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall assembly structure of the present invention.

[0020] Figure 2It is a structural schematic diagram of the present invention.

[0021] Figure 3 This is a structural diagram of the voltage sampling terminal.

[0022] Figure 4 This is a schematic diagram of the structure of the temperature sampling component. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] See also Figure 1 , Figure 2 The present invention provides a battery module 4 sampling structure, comprising: a cable body 1, a plurality of sampling branches 2 welded on the cable body 1, and a busbar 3 arranged on the battery module 4, one end of the sampling branch 2 is welded to the cable body 1, and the other end is connected and fixed to the busbar 3 and contacts with the battery pole of the battery module 4, the cable body 1 is composed of a plurality of flat cables placed in parallel, and the upper and lower parts of the flat cables are respectively covered with insulating films to form a flexible flat cable.

[0025] In the solution provided by the present invention, a plurality of flat cables are placed in parallel and then covered with an insulating film, thereby preventing the flat cables from short-circuiting the battery module 4 and providing protection for the overall circuit. At the same time, since the sampling signal is transmitted only through the flat cables, the overall processing and manufacturing process is simple, and pollutants are not easily generated during the processing and manufacturing process, effectively meeting environmental protection requirements and reducing corresponding cost expenditures.

[0026] In some embodiments, the thickness of the flat cable is 0.05-0.15 mm, and the width of the flat cable is 0.5-1.0 mm. Preferably, in the embodiments provided by the present invention, a flat cable with a thickness of 0.1 mm and a width of 0.7 mm is selected, and a spacing of 1.3 mm is set between adjacent flat cables, so as to ensure that the flexibility of the cable body 1 is not affected, and the transmission performance of the detection signal is not easily affected by the temperature rise generated during the working process.

[0027] In some embodiments, see Figure 3 , Figure 4The sampling branch 2 includes a voltage sampling terminal 21 and a temperature sampling component 22, and the voltage sampling terminal 21 and the temperature sampling component 22 are electrically connected to the cable body 1 respectively. The voltage information of the battery module 4 is collected through the voltage sampling terminal 21, and the collected voltage information is sent through the cable body 1, so that the voltage data collected by the voltage sampling terminal 21 is sent to the control system. The temperature information on the battery module 4 is collected through the temperature sampling component 22, and the collected temperature information is sent back to the control system, so that the control system can detect and judge the temperature of the battery module 4.

[0028] In some embodiments, the voltage sampling terminal 21 and / or the temperature sampling component 22 include: a terminal body 201, a plurality of welding pads 202 arranged on the terminal body 201, and a sampling terminal 203 arranged at the end of the terminal body 201, the sampling terminal 203 is in contact with the battery pole of the battery module 4, and the insulating film on the cable body 1 is provided with an exposed window area at the position of the welding pad 202 on the terminal body 201, and the welding pad 202 is welded to the cable body 1 through the window area.

[0029] In some embodiments, the opening on the pad 202 is a waisted hole, the short diameter of the waisted hole is 0.4-0.7mm, and the long diameter of the waisted hole is 0.6-1.0mm. By setting the opening, it is convenient to weld and fix the pad 202 to the flat cable, so as to meet the connection between the voltage sampling terminal 203 sub-21 and / or the temperature sampling component 22 and the flat cable, so that the data information collected by the voltage sampling terminal 203 sub-21 and / or the temperature sampling component 22 is transmitted to the control system through the flat cable.

[0030] In some embodiments, a bilateral anti-expansion structure 204 is provided between the terminal body 201 and the sampling end 203, and the bilateral anti-expansion structure 204 is punched into a three-section structure, and the width of each section of the three-section structure is ≥2.3mm, and the three-section structure is S-shaped and connected. An anti-tear hole 2042 is provided at the punching cut 2041, and the aperture of the anti-tear hole 2042 is 1.0-5mm. During the long-term use of the battery module 4, expansion displacement will occur, causing a certain offset of the detection point. In the present invention, by adopting a three-section bilateral anti-expansion structure 204, when the battery module 4 expands, the terminal body 201 can obtain a certain degree of offset, satisfying the contact effect with the battery module 4, thereby ensuring the stability of the detection effect of the voltage and temperature data of the battery module 4.

[0031] In the specific embodiment provided by the present invention, the aperture of the anti-tear hole 2042 is 1.5 mm, so as to effectively meet the displacement change of a certain angle of the structure on both sides of the punching cut 2041, thereby preventing the bilateral anti-expansion structure 204 from breaking from the punching cut 2041 due to a large displacement change, thereby causing the sampling branch 2 to be unable to perform detection normally.

[0032] In some embodiments, see Figure 4 , an NTC chip 221 is arranged on the sampling end 203 of the temperature sampling component 22, and the NTC chip 221 is surrounded by an injection molded part 222, and a sealant is applied between the NTC chip 221 and the injection molded part 222, and a thermal pad 223 is arranged at the bottom of the sampling end 203, and the thermal pad 223 is in contact with the upper surface of the battery module 4. By applying sealant on the outside of the NTC chip 221, and then injection molding the injection molded part 222 on the outside of the NTC chip 221, the NTC chip 221 is effectively protected and fixed. When the thermal pad 223 contacts the upper surface of the battery module 4, when the battery module 4 generates heat due to work, the heat will be transmitted to the NTC chip 221 through the thermal pad 223, and the temperature will be detected by the NTC chip 221, so as to effectively detect the current temperature value and temperature change of the battery module 4, and the temperature information detected by the NTC chip 221 will be transmitted back to the control system through the cable body 1.

[0033] In some embodiments, convex humps 2221 are provided on both sides of the injection molded part 222, the top surface of the convex humps 2221 is flush with the top surface of the injection molded part 222, the height of the convex humps 2221 is 0.2-1.0 mm, and the injection molded part 222 is embedded in the inner hole of the busbar 3 and connected to the busbar 3 through the convex humps 2221. The injection molded part 222 is embedded in the inner hole of the busbar 3 through the convex humps 2221 on both sides of the injection molded part 222, thereby providing position limits in the X-axis and Y-axis directions, improving the stability of the connection between the temperature sampling component 22 and the busbar 3, and when the battery module 4 expands due to long-term work, the sampling end 203 of the temperature sampling component 22 can be driven by the busbar 3 to move synchronously, ensuring the stability of the temperature measurement effect of the battery module 4.

[0034] In the specific embodiment provided by the present invention, the height of the convex hump 2221 is preferably 0.5 mm, so as to ensure the stability of the contact and connection between the convex hump 2221 and the busbar 3, and avoid the risk of the convex hump 2221 easily falling off the busbar 3 due to the height of the convex hump 2221 being too small.

[0035] Side arms 2222 are provided on both sides of the bottom of the injection molded part 222, the thickness of the side arms 2222 is 0.5-1.5 mm, the side arms 2222 are in contact with the bottom surface of the busbar 3, and a bearing film is provided between the side arms 2222 and the busbar 3. The side arms 2222 provide limiting support for the injection molded part 222 and the busbar 3 in the Z-axis direction, thereby improving the stability of the connection between the injection molded part 222 and the busbar 3, and ensuring that the thermal pad 223 at the bottom of the temperature sampling component 22 is in effective contact with the battery module 4, thereby transferring the heat generated during the operation of the battery module 4 to the NTC chip 221, and ensuring the stable operation of the temperature measurement.

[0036] In the specific embodiment provided by the present invention, the thickness of the side arm 2222 is preferably 1.0 mm, ensuring that the thermal pad 223 is effectively attached to the upper surface of the battery module 4 through the limit between the busbar 3 and the side arm 2222, thereby avoiding the problem that the thermal pad 223 is separated from the upper surface of the battery module 4 due to thermal expansion displacement of the battery module 4, thereby affecting the temperature measurement effect.

[0037] In some embodiments, a hot-pressed insulating film 5 is provided between the bottom of the cable body 1 and the battery module 4 to provide insulation protection for the cable body 1, avoid short circuit between the cable body 1 and the battery module 4, and ensure the safety of the overall circuit.

[0038] In summary, the present invention provides protection for the overall circuit by placing a number of flat cables in parallel and then covering them with an insulating film, thereby preventing the flat cables from causing short circuits in the battery module. At the same time, since the sampling signal is transmitted only through the flat cables, the overall manufacturing process is simple, and pollutants are not easily generated during the manufacturing process, effectively meeting environmental protection requirements and reducing corresponding cost expenditures.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery module sampling structure, comprising: It is characterized in that it includes: a cable body, a plurality of sampling branches welded to the cable body, and a busbar arranged on the battery module, one end of the sampling branch is welded to the cable body, and the other end is connected and fixed to the busbar and contacts with the battery pole of the battery module, and the cable body is composed of a plurality of flat cables placed in parallel, and the upper and lower parts of the flat cables are respectively covered with an insulating film to form a flexible flat cable.

2. The battery module sampling structure according to claim 1, characterized in that: The thickness of the flat cable is 0.05-0.15 mm.

3. The battery module sampling structure according to claim 1, characterized in that: The width of the flat cable is 0.5-1.0 mm.

4. The battery module sampling structure according to claim 1, characterized in that: The sampling branch includes a voltage sampling terminal and a temperature sampling component, and the voltage sampling terminal and the temperature sampling component are electrically connected to the cable body respectively.

5. The battery module sampling structure according to claim 4, characterized in that: The voltage sampling terminal and / or temperature sampling assembly includes: a terminal body, a plurality of welding pads arranged on the terminal body, and a sampling end arranged at the end of the terminal body, the sampling end is in contact with the battery pole of the battery module, and the insulating film on the cable body is provided with an exposed window area corresponding to the welding pad position on the terminal body, and the welding pad is welded to the cable body through the window area.

6. The battery module sampling structure according to claim 5, characterized in that: The opening on the pad is a girdle hole, the short diameter of the girdle hole is 0.4-0.7 mm, and the long diameter of the girdle hole is 0.6-1.0 mm.

7. The battery module sampling structure according to claim 5, characterized in that: A bilateral anti-expansion structure is provided between the terminal body and the sampling end. The bilateral anti-expansion structure is punched into a three-section structure. The width of each section of the three-section structure is ≥2.3mm. The three-section structure is connected and distributed in an S shape. An anti-tear hole is provided at the punching cut. The aperture of the anti-tear hole is 1.0-5mm.

8. The battery module sampling structure according to claim 5, characterized in that: An NTC chip is arranged on the sampling end of the temperature sampling component, the outside of the NTC chip is surrounded by an injection molded part, a sealant is coated between the NTC chip and the injection molded part, and a thermal pad is arranged at the bottom of the sampling end, and the thermal pad is in contact with the upper surface of the battery module.

9. The battery module sampling structure according to claim 8, characterized in that: The two sides of the injection molded part are provided with convex hulls, the top surface of the convex hulls is flush with the top surface of the injection molded part, the height of the convex hulls is 0.2-1.0mm, and the injection molded part is embedded in the inner hole of the busbar and connected to the busbar through the convex hulls; Side arms are arranged on both sides of the bottom of the injection molded part, the thickness of the side arms is 0.5-1.5 mm, the side arms are in contact with the bottom surface of the busbar, and a bearing film is arranged between the side arms and the busbar.

10. The battery module sampling structure according to claim 1, characterized in that: A hot-pressed insulating film is arranged between the lower portion of the cable body and the battery module.

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