A battery sampling device and battery pack

Abstract

This invention provides a battery sampling device and a battery pack. The battery sampling device includes an FPC and an NTC module. The FPC uses a first metal substrate, and the NTC module uses a second metal substrate. The NTC module includes an NTC body and a connector. One end of the connector is connected to the FPC, and the other end is connected to the NTC body. The FPC and the connector are welded to form a welding area. A covering area is provided on the outer surface of the welding area, covering all the welding area and part of the non-welding area. The area of ​​the welding area covered by the covering area is M1, and the area of ​​the non-welding area covered by the covering area is M2. The ratio of M1 / M2 satisfies 0.7 ≤ M1 / M2 ≤ 1.3. This battery sampling device can effectively ensure the stability and firmness of the welded connection between the FPC and the NTC module, thereby avoiding the phenomenon of electrical connection failure of the NTC module during use due to weak weld strength between different metals.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and specifically relates to a battery sampling device and a battery pack. Background Technology

[0002] In many applications of battery systems, FPC (flexible printed circuit board) forms an electrical connection and signal detection structure component by connecting with battery cells, temperature sensors, etc., to achieve voltage and temperature sampling of battery cells. NTC (thermistor) components play a key role in temperature monitoring and control, and their leads are responsible for transmitting resistance signals to the FPC circuit.

[0003] However, when the substrate of the FPC and the leads of the NTC module are made of different metals, the different melting points of the metals prevent them from fully fusing, thus failing to form a stable and secure connection. During long-term use, the welded joints are easily affected by factors such as temperature changes, mechanical vibration, and current heating effects, which can easily lead to loosening and cracking, causing the electrical connection of the NTC module to fail. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a battery sampling device that can ensure the stability of the connection between FPC and NTC components, thereby avoiding the phenomenon of NTC component electrical connection failure during use due to weak welding strength between different metals.

[0005] Another objective of this invention is to provide a battery pack.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A battery sampling device includes an FPC and an NTC component, wherein the FPC is made of a first metal substrate and the NTC component is made of a second metal substrate;

[0008] The NTC component includes an NTC body and a connector. One end of the connector is connected to the FPC, and the other end is connected to the NTC body. The FPC and the connector are welded to form a welding area. A covering area is provided on the outer surface of the welding area. The covering area covers all the welding area and part of the non-welding area. The area of ​​the welding area covered by the covering area is M1, and the area of ​​the non-welding area covered by the covering area is M2. The ratio of M1 / M2 satisfies 0.7≤M1 / M2≤1.3.

[0009] As can be seen from the above technical solutions, in the battery sampling device disclosed in this utility model embodiment, when the ratio of M1 / M2 is too large, the constraint force of the covering area on the welding area will become weak; when the ratio of M1 / M2 is too small, the welding area will be too small or the covering area will be too large. A welding area that is too small will further lead to poor welding strength, while a covering area that is too large will affect the normal wiring of the FPC. Therefore, this battery sampling device, while setting the covering area, ensures that the ratio of M1 / M2 satisfies 0.7≤M1 / M2≤1.3, which can effectively guarantee the stability and firmness of the welding connection between the FPC and the NTC component, thereby avoiding the phenomenon of NTC component electrical connection failure during use due to weak welding strength between different metals. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overall structure of the battery sampling device disclosed in the embodiment of this utility model;

[0012] Figure 2 This is a front view structural diagram of the connection between the FPC and NTC components disclosed in the embodiment of this utility model;

[0013] Figure 3 This is a top view of the connection between the FPC and NTC components disclosed in the embodiment of this utility model.

[0014] Figure 4 This is a schematic diagram of the arrangement structure of the first insulating film and the second insulating film disclosed in the embodiments of this utility model.

[0015] Explanation of reference numerals in the attached figures:

[0016] 100. FPC; 101. FPC body; 102. FPC branch; 103. FPC welding end;

[0017] 200. NTC component; 201. NTC body; 202. Connector; 2021. First connecting part; 2022. Second connecting part;

[0018] 300. Welding area;

[0019] 400, Covered area; 401, Non-welded area;

[0020] 500 - First insulating film;

[0021] 600 - Second insulating film. Detailed Implementation

[0022] In view of this, the core of this utility model is to provide a battery sampling device that can ensure the stability of the connection between FPC and NTC components, thereby avoiding the phenomenon of NTC component electrical connection failure during use due to weak welding strength between different metals.

[0023] Another key aspect of this invention is that it provides a battery pack.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Please refer to... Figures 1-4 .

[0025] Please refer to Figures 1 to 3 The battery sampling device disclosed in this embodiment of the present invention includes an FPC100 and an NTC component 200. The FPC100 adopts a first metal substrate and the NTC component 200 adopts a second metal substrate.

[0026] The NTC component 200 includes an NTC body 201 and a connector 202. One end of the connector 202 is connected to the NTC body 201, and the other end is welded to the FPC 100 to form a welding area 300. The outer surface of the welding area 300 is provided with a covering area 400, which covers all of the welding area 300 and part of the non-welding area 401. The area of ​​the welding area 300 covered by the covering area 400 is M1, and the area of ​​the non-welding area 401 covered by the covering area 400 is M2. The ratio of M1 / M2 satisfies 0.7≤M1 / M2≤1.3.

[0027] In the battery sampling device disclosed in this embodiment of the present invention, when the ratio of M1 / M2 is too large, the constraint force of the covering area 400 on the welding area 300 will become weaker; when the ratio of M1 / M2 is too small, the area of ​​the welding area 300 will be too small or the area of ​​the covering area 400 will be too large. A small area of ​​the welding area 300 will further lead to poor welding strength, while an excessively large area of ​​the covering area 400 will affect the normal wiring of the FPC100. Therefore, while setting the covering area 400, the battery sampling device ensures that the ratio of M1 / M2 satisfies 0.7≤M1 / M2≤1.3, which can effectively guarantee the stability and firmness of the welding connection between the FPC100 and the NTC component 200, thereby avoiding the phenomenon of NTC component electrical connection failure during use due to weak welding strength between different metals.

[0028] The ratio of M1 / M2 can be 0.71, 0.73, 0.76, 0.78, 0.83, 0.90, 1.1, 1.2 or 1.3.

[0029] The present invention does not limit the specific materials of the first metal substrate and the second metal substrate. Any material that meets the requirements of the present invention is within the protection scope of the present invention.

[0030] As a specific embodiment of the present invention, the first metal substrate disclosed in the present invention is an aluminum substrate, and the second metal substrate is a copper substrate.

[0031] This embodiment of the utility model does not limit the specific welding method of the welding area 300. Any welding method that meets the requirements of this utility model is within the protection scope of this utility model.

[0032] As one embodiment of the present invention, the welding area 300 disclosed in this embodiment of the present invention is laser welded.

[0033] In another embodiment of this utility model, the welding area 300 disclosed in this embodiment is ultrasonically welded.

[0034] As a further embodiment, the pull-out force range of the weld area 300 disclosed in this utility model embodiment is 20N-100N. The pull-out force can be 20N, 30N, 50N, 60N, 80N, or 100N. If the pull-out force of the weld area 300 is too large, the weld area 300 formed by the FPC100 and NTC component 200 will bear excessive stress, resulting in plastic deformation or brittle fracture of the weld area 300. If the pull-out force of the weld area 300 is too small, the bonding strength between the FPC100 and NTC component 200 will be insufficient, making it prone to cracking or detachment under load.

[0035] To ensure the welding strength between FPC100 and NTC component 200, the minimum area of ​​the welding zone 300 disclosed in this embodiment of the invention is 20 mm². 2 -40mm 2 .

[0036] As a specific embodiment, the minimum area of ​​the welding area 300 disclosed in this utility model embodiment is 20 mm. 2 23mm 2 25mm 2 30mm 2 35 mm 2 40 mm 2 .

[0037] As a further embodiment, the peeling force range of the welded area disclosed in this utility model embodiment is 10N-50N.

[0038] As a specific embodiment, the peeling force of the welded area disclosed in this utility model embodiment is 10N, 13N, 15N, 18N, 25N, 32N, 38N, 42N or 50N.

[0039] This embodiment of the utility model does not limit the specific formation method of the covering area 400. Any formation method that meets the requirements of this utility model is within the protection scope of this utility model.

[0040] As one embodiment of the present invention, the covering area 400 disclosed in the present invention embodiment can be formed by dispensing, that is, by using dispensing equipment to apply liquid adhesive to the welding area 300 in a specific amount and shape.

[0041] In another embodiment of the present invention, the covering area 400 disclosed in this embodiment is formed by a film, that is, a protective film is wrapped around the welding area 300.

[0042] Of course, the covering area 400 can also be formed in other ways. Any forming method that meets the requirements of this utility model is within the protection scope of this utility model. Those skilled in the art can choose according to actual needs.

[0043] It should be noted that the FPC100 disclosed in this embodiment of the present invention includes an FPC body 101 and an FPC branch 102, wherein the NTC component 200 and the FPC branch 102 are soldered together.

[0044] The present invention does not limit the specific structure of the connector 202. As a specific embodiment of the present invention, the connector 202 disclosed in the present invention includes at least a first connecting part 2021 and a second connecting part 2022. One end of the first connecting part 2021 is welded to the FPC branch 102, and the other end is connected to one end of the second connecting part 2022. The other end of the second connecting part 2022 is connected to the NTC 200.

[0045] As a further embodiment, the first connecting part 2021 disclosed in this utility model embodiment is a block structure and the second connecting part 2022 is a strip structure. This arrangement does not affect the strength of the welding and can also achieve the weight reduction of the entire battery sampling device.

[0046] In order to further improve the welding strength of the welding area 300, the FPC branch 102 and the first connecting part 2021 disclosed in this utility model embodiment are both at least two, and one first connecting part 2021 is welded to one FPC branch 102.

[0047] It should be noted that the FPC branch 102 is provided with a welding end, wherein the first connecting part 2021 and the FPC welding end 103 are welded together.

[0048] Both the first connecting portion 2021 and the FPC welding end 103 are rectangular structures, and the width of the first connecting portion 2021 is no greater than the width of the FPC welding end 103. This design facilitates welding.

[0049] Please refer to Figure 4 The battery sampling device disclosed in this embodiment of the present invention further includes a first insulating film 500 and a second insulating film 600, with the NTC component 200 and the FPC welding end 103 disposed between the first insulating film 500 and the second insulating film 600. This arrangement can effectively prevent short circuits in the battery sampling device.

[0050] This utility model embodiment also discloses a battery pack, including a battery sampling device as disclosed in any of the above embodiments.

[0051] Since the battery pack uses the battery sampling device disclosed in the present invention, the battery pack also has the technical advantages of the battery sampling device disclosed in the present invention, which will not be described in detail in the present invention.

[0052] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is 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.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery sampling device, characterized in that, It includes an FPC and an NTC component, wherein the FPC uses a first metal substrate and the NTC component uses a second metal substrate; The NTC component includes an NTC body and a connector. One end of the connector is connected to the FPC, and the other end is connected to the NTC body. The FPC and the connector are welded to form a welding area. A covering area is provided on the outer surface of the welding area. The covering area covers all the welding area and part of the non-welding area. The area of ​​the welding area covered by the covering area is M1, and the area of ​​the non-welding area covered by the covering area is M2. The ratio of M1 / M2 satisfies 0.7≤M1 / M2≤1.

3.

2. The battery sampling device according to claim 1, characterized in that, The first metal substrate is an aluminum substrate, and the second metal substrate is a copper substrate.

3. The battery sampling device according to claim 1, characterized in that, The welding area is welded using laser welding and ultrasonic welding.

4. The battery sampling device according to claim 1, characterized in that, The pull-out force range of the welded area is 20N-100N.

5. The battery sampling device according to claim 1, characterized in that, The minimum area of ​​the welding zone is 20mm. 2 -40mm 2 .

6. The battery sampling device according to claim 1, characterized in that, The peeling force of the welded area ranges from 10N to 50N.

7. The battery sampling device according to claim 1, characterized in that, The coating area is formed by dispensing adhesive or by coating.

8. The battery sampling device according to claim 1, characterized in that, The FPC includes an FPC body and FPC branches, and the NTC component is soldered to the FPC branches.

9. The battery sampling device according to claim 8, characterized in that, The connector includes at least a first connecting part and a second connecting part. One end of the first connecting part is welded to the FPC branch, and the other end is connected to one end of the second connecting part. The other end of the second connecting part is connected to the NTC. The first connecting part is a block structure, and the second connecting part is a strip structure.

10. The battery sampling device according to claim 9, characterized in that, There are at least two FPC branches and at least two first connecting parts, and one first connecting part is welded to one FPC branch.

11. The battery sampling device according to claim 9, characterized in that, An FPC welding end is provided on the FPC branch, and the first connecting part is welded to the FPC welding end; Both the first connecting part and the FPC welding end are rectangular structures, and the width of the first connecting part is not greater than the width of the FPC welding end.

12. The battery sampling device according to claim 11, characterized in that, It also includes a first insulating film and a second insulating film, with the NTC assembly and the FPC welding end sandwiched between the first insulating film and the second insulating film.

13. A battery pack, characterized in that, Includes the battery sampling device as described in any one of claims 1-12.

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