Battery sampling assembly and battery pack
By using direct connection in the battery sampling module and using metal composite materials to make connection lines, the problems of high manufacturing cost and electrochemical corrosion of battery sampling modules in the prior art are solved, and cost reduction and connection reliability are achieved.
Patent Information
- Application Number
- CN202421646984.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-11
AI Technical Summary
The manufacturing cost of existing battery sampling components is high, mainly because the use of nickel sheets is required for the connection between copper and aluminum, which leads to an increase in cost. In addition, there are electrochemical corrosion problems in copper and aluminum connections, which require anti-corrosion treatment.
The direct connection is adopted, and the connector is electrically connected through the first section of the connecting line (copper foil section), and the second section (aluminum foil section) is electrically connected to the busbar, and the connection line is made of metal composite materials. The second metal and busbar material are the same to avoid electrochemical corrosion.
Reduces the manufacturing cost of battery sampling components, avoids reflow soldering and corrosion-proof treatment of nickel sheets, and improves connection reliability and efficiency.
Smart Images
Figure CN222927710U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of new energy batteries, and in particular, to a battery sampling assembly and a battery pack. Background Art
[0002] A battery pack generally includes battery cells, busbars, sampling assemblies, etc. A plurality of battery cells are arranged in sequence to form a battery cell group. The battery pack includes at least one battery cell group. The battery cells are connected by busbars to achieve current-carrying transmission, and the voltage and temperature information of the battery is transmitted to the BMS (Battery Management System) by the sampling assembly.
[0003] As the core component for collecting module information, in the prior art, a wire harness, FPC or FFC is mainly used to achieve its function. Taking the FPC as an example, the FPC needs to be connected to the busbar through a nickel sheet, resulting in a high cost. If direct connection is used, the connecting line is generally made of copper, and the busbar is generally made of aluminum. Since the melting points of copper and aluminum differ greatly, it is difficult to achieve laser welding, and only copper-aluminum ultrasonic welding can be used. Compared with the laser welding process, the ultrasonic welding process has lower welding efficiency and yield. In addition, there is also electrochemical corrosion when copper and aluminum are connected, and anti-corrosion treatment needs to be carried out after connection, which also increases the manufacturing cost of the sampling assembly.
[0004] As can be seen from the above, there is a problem of high manufacturing cost of the battery sampling assembly in the prior art. Summary of the Utility Model
[0005] The main purpose of the utility model is to provide a battery sampling assembly and a battery pack to solve the problem of high manufacturing cost of the battery sampling assembly in the prior art.
[0006] To achieve the above object, according to one aspect of the utility model, a battery sampling assembly is provided, including: a busbar; a connector; a connecting line, the connecting line includes a first section and a second section connected in sequence, the first section is made of a first metal, the second section is made of a second metal, the second metal has the same material as the busbar, the first section is electrically connected to the connector, and the second section is electrically connected to the busbar.
[0007] Further, the first section of the connecting line is a copper foil section, and the second section is an aluminum foil section.
[0008] Further, the connecting line is a flexible die-cut connecting line.
[0009] Further, there are a plurality of connecting lines, and the plurality of connecting lines are die-cut from a metal composite foil sheet.
[0010] Further, the metal composite foil sheet includes a middle main body portion and side portions located on both sides of the middle main body portion. The middle main body portion is made of a first metal, and the side portions are made of a second metal.
[0011] Further, the battery sampling assembly further includes an NTC sensor. There are multiple connection lines, and the NTC sensor is electrically connected to the first sections of two adjacent connection lines.
[0012] Further, the battery sampling assembly further includes insulating films. There are two insulating films, and the two insulating films are arranged in an up-and-down fitting manner to cover the connector, the first sections, and a part of the second sections.
[0013] Further, the first sections are welded to the connector; and / or the second sections are welded to the bus bar.
[0014] Further, the battery sampling assembly further includes an NTC sensor and an insulating film covering the connector and the connection lines. The NTC sensor and the first sections are respectively welded to the connection lines and the connector through pads, and the insulating film is provided with avoidance notches for avoiding the pads.
[0015] According to another aspect of the present utility model, there is also provided a battery pack, including the above-mentioned battery sampling assembly.
[0016] Applying the technical solution of the present utility model, the battery sampling assembly includes a bus bar, a connector, and connection lines. The connection lines include a first section and a second section connected in sequence. The first section is made of a first metal, and the second section is made of a second metal different from the first metal. The first section is electrically connected to the connector, and the second section is electrically connected to the bus bar. In this way, the existing connection between the bus bar and the connection lines through a nickel sheet is replaced by a direct connection method, and at the same time, the reflow soldering of the nickel sheet is omitted, reducing the manufacturing cost of the battery sampling assembly. Further, the connection lines are made of a metal composite material and the second metal has the same material as the bus bar, so that there will be no electrochemical corrosion between the connection lines and the bus bar and no anti-corrosion treatment is required, further reducing the manufacturing cost of the battery sampling assembly, and solving the problem of relatively high manufacturing cost of the battery sampling assembly in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:
[0018] Figure 1 The structural schematic diagram of the battery sampling assembly in a specific embodiment of the present utility model is shown;
[0019] Figure 2Shows a schematic structural diagram of a metal composite foil sheet in a specific embodiment of the present utility model;
[0020] Figure 3 Shows a schematic structural diagram of a connected circuit after die-cutting in a specific embodiment of the present utility model.
[0021] Among them, the above-mentioned drawings include the following reference numerals:
[0022] 10, bus bar; 20, connector; 30, connected circuit; 31, first section; 32, second section; 40, metal composite foil sheet; 41, middle main body part; 42, side part; 50, NTC sensor; 60, insulating film. Specific embodiments
[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.
[0024] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.
[0025] In the present utility model, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" are generally in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation words do not limit the present utility model.
[0026] Obviously, the above-described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative work shall fall within the protection scope of the present utility model.
[0027] In order to solve the problem of relatively high manufacturing cost of the battery sampling assembly in the prior art, the present utility model provides a battery sampling assembly and a battery pack. Among them, the following battery pack includes the following battery sampling assembly.
[0028] Such as Figure 1 And Figure 3As shown, the battery sampling assembly includes a bus bar 10, a connector 20, and a connection line 30. The connection line 30 includes a first section 31 and a second section 32 connected in sequence. The first section 31 is made of a first metal, and the second section 32 is made of a second metal, which is the same material as the bus bar 10. The first section 31 is electrically connected to the connector 20, and the second section 32 is electrically connected to the bus bar 10.
[0029] The battery sampling assembly includes a bus bar 10, a connector 20, and a connection line 30. The connection line 30 includes a first section 31 and a second section 32 connected in sequence. The first section 31 is made of a first metal, and the second section 32 is made of a second metal, which is the same material as the bus bar 10. The first section 31 is electrically connected to the connector 20, and the second section 32 is electrically connected to the bus bar 10. In this way, the existing connection between the bus bar 10 and the connection line 30 through a nickel sheet is replaced by a direct connection method, and at the same time, the reflow soldering of the nickel sheet is eliminated, reducing the manufacturing cost of the battery sampling assembly. Further, the connection line 30 is made of a metal composite material and the second metal is the same material as the bus bar 10, so that there will be no electrochemical corrosion between the connection line 30 and the bus bar 10 and no anti-corrosion treatment is required, further reducing the manufacturing cost of the battery sampling assembly.
[0030] In this embodiment, the bus bar 10 is made of aluminum, and correspondingly, the connection line 30 is a copper-aluminum composite foil. The first section 31 is a copper foil section, and the second section 32 is an aluminum foil section.
[0031] In this embodiment, the first section 31 is welded to the connector 20. Correspondingly, the second section 32 is welded to the bus bar 10. Specifically, the second section 32 and the bus bar 10 are laser welded to ensure the welding efficiency and yield between the second section 32 and the bus bar 10.
[0032] Preferably, the connection line 30 in this embodiment uses an FDC (Flexible Die-Cutted Cable) die-cut line to replace the etched line solution. Compared with the process of exposure, development, and etching for the lines in FPC, it has the advantages of more environmentally friendly processing, shorter processing cycle, and lower processing cost. That is to say, the connection line 30 in this embodiment is a flexible die-cut connection line 30.
[0033] In this embodiment, there are multiple connection lines 30, and the multiple connection lines 30 are die-cut from a metal composite foil sheet 40. Further, there are also multiple busbars 10, and the multiple busbars 10 are arranged in one-to-one correspondence with the multiple connection lines 30. The multiple busbars 10 are divided into two rows and are located at both ends of the battery cell group, respectively connecting the positive or negative electrodes of two adjacent battery cells. By using FDC die-cutting to form the metal composite connection lines 30, each connection line 30 is integrally formed, and the direct connection between the connection line 30 and the busbar 10 can be achieved, thereby reducing the electrical connection points of the battery sampling assembly and increasing the reliability of the electrical connection of the battery sampling assembly.
[0034] Specifically, as Figure 2 shown, the metal composite foil sheet 40 includes a middle main body portion 41 and side portions 42 located on both sides of the middle main body portion 41. The middle main body portion 41 is made of a first metal, and the side portions 42 are made of a second metal. That is to say, the middle main body portion 41 is made of copper, and the side portions 42 are made of aluminum.
[0035] In this embodiment, the connection lines 30 are located between the two rows of busbars 10. The lengths of the connection lines 30 are different from each other. The first section 31 and the second section 32 of a part of each connection line 30 are bent towards both sides and are welded to the busbars 10 in sequence. Correspondingly, the metal composite foil sheet 40 used for die-cutting into the connection lines 30 is divided into upper and lower layers. The middle position is the middle main body portion 41, and the middle main body portion 41 occupies most of the width of the metal composite foil sheet 40, thereby die-cutting into the first sections 31 of the multiple connection lines 30. The upper and lower sides of the middle main body portion 41 are the side portions 42, thereby directly die-cutting to form the second sections 32 bent towards the upper and lower sides.
[0036] As Figure 1 shown, the battery sampling assembly further includes an NTC sensor 50, and the NTC sensor 50 is electrically connected to the first sections 31 of two adjacent connection lines 30 respectively. Specifically, the two pins of the NTC sensor 50 are welded to the first sections 31 of two adjacent connection lines 30 respectively.
[0037] As Figure 1 described, the battery sampling assembly further includes two insulating films 60. The two insulating films 60 are arranged in an upper and lower fitting manner to cover the connector 20, the first section 31, and a part of the second section 32. It can be understood that the insulating film 60 does not cover all parts of the second section 32 to avoid affecting the welding between the second section 32 and the busbar 10.
[0038] In this embodiment, the insulating film 60 is a PI film.
[0039] In this embodiment, the NTC sensor 50 and the first section 31 are respectively welded to the connection line 30 and the connector 20 through pads, and the insulating film 60 is provided with an avoidance notch for avoiding the pads. That is, the NTC sensor 50 is welded to the connection line 30 through the pad, the first section 31 is welded to the connector 20 through the pad, the pad exposes from the avoidance notch to the insulating film 60, the NTC sensor 50 is reflow welded to the first section 31 of the connection line 30 through the pad, and the first section 31 of the connection line 30 is reflow welded to the connector 20 through the pad.
[0040] The manufacturing process of the battery sampling assembly in this embodiment is specifically as follows:
[0041] The metal composite foil sheet 40 is flexibly die-cut to process the connection line 30 as shown in Figure 3 After die-cutting, the insulating film 60 is covered on the upper and lower layers of the connection line 30 and hot-pressed. Among them, the insulating film 60 covering the upper layer of the connection line 30 is provided with avoidance notches at the connector 20 and the NTC sensor 50, so that the pads expose from the avoidance notches to the insulating film 60. After hot-pressing, the pads are subjected to OSP treatment. After the treatment, the connector 20 and the NTC sensor 50 are reflow welded. After the reflow welding is completed, the second section 32 and the bus bar 10 are laser welded, and finally as shown in Figure 1 shown.
[0042] This application also provides a battery pack, including the above-mentioned battery sampling assembly. Further, the battery pack further includes a battery cell group. The bus bar 10 is electrically connected to the battery cell group, and the connector 20 is electrically connected to the battery management system, thereby forming a sampling loop. The sampling loop collects the voltage / current parameters of the battery cell group through the connection line 30 and then transmits them to the battery management system, so as to monitor the state of the battery cell group in real time.
[0043] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects: The battery sampling assembly includes a bus bar 10, a connector 20 and a connection line 30. The connection line 30 includes a first section 31 and a second section 32 connected in sequence. The first section 31 is made of a first metal, and the second section 32 is made of a second metal. The second metal has the same material as the bus bar 10. The first section 31 is electrically connected to the connector 20, and the second section 32 is electrically connected to the bus bar 10. In this way, the existing connection between the bus bar 10 and the connection line 30 through a nickel sheet is replaced by a direct connection method, and at the same time, the reflow welding of the nickel sheet is omitted, reducing the manufacturing cost of the battery sampling assembly. Further, the connection line 30 is made of a metal composite material and the second metal has the same material as the bus bar 10, so that there is no electrochemical corrosion between the connection line 30 and the bus bar 10 and no anti-corrosion treatment is required, further reducing the manufacturing cost of the battery sampling assembly.
[0044] It should be noted that the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0045] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0046] The foregoing are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A battery sampling assembly, characterized in that: include: Busbar (10); Connector (20); A connecting line (30), the connecting line (30) comprising a first section (31) and a second section (32) connected in sequence, the first section (31) being made of a first metal, the second section (32) being made of a second metal, the second metal being made of the same material as the busbar (10), the first section (31) being electrically connected to the connector (20), and the second section (32) being electrically connected to the busbar (10).
2. The battery sampling assembly according to claim 1, characterized in that: The first section (31) of the connecting line (30) is a copper foil section, and the second section (32) is an aluminum foil section.
3. The battery sampling assembly according to claim 1, characterized in that: The connection line (30) is a flexible die-cut connection line (30).
4. The battery sampling assembly according to claim 3, characterized in that: There are a plurality of connection circuits (30), and the plurality of connection circuits (30) are made by die-cutting a metal composite foil sheet (40).
5. The battery sampling assembly according to claim 4, characterized in that: The metal composite foil sheet (40) comprises a middle main body portion (41) and side portions (42) located on both sides of the middle main body portion (41); the middle main body portion (41) is made of the first metal, and the side portions (42) are made of the second metal.
6. The battery sampling assembly according to claim 1, characterized in that: The battery sampling assembly further comprises an NTC sensor (50), there are a plurality of connecting lines (30), and the NTC sensor (50) is electrically connected to the first sections (31) of two adjacent connecting lines (30).
7. The battery sampling assembly according to claim 1, characterized in that: The battery sampling assembly further comprises an insulating film (60), wherein the insulating films (60) are two in number, and the two insulating films (60) are arranged in a vertically aligned manner to cover the connector (20), the first section (31) and a portion of the second section (32).
8. The battery sampling assembly according to claim 1, characterized in that: The first section (31) is welded to the connector (20); and / or The second section (32) is welded to the busbar (10).
9. The battery sampling assembly according to claim 8, characterized in that: The battery sampling assembly further comprises an NTC sensor (50) and an insulating film (60) covering the connector (20) and the connecting line (30); the NTC sensor (50) and the first section (31) are respectively welded to the connecting line (30) and the connector (20) via welding pads; and the insulating film (60) is provided with an escape notch for escaping the welding pad.
10. A battery pack, characterized in that: A battery sampling assembly comprising any one of claims 1 to 9.