Battery cell connection assembly, preparation method thereof and battery pack

Abstract

The invention provides a cell connection assembly, comprising: a panel made of a conductive material and comprising a plurality of flat cable strips, the plurality of flat cable strips are arranged on the panel, and the plurality of flat cable strips are arranged side by side at intervals; the panel comprises a first insulating connecting film layer and a second insulating connecting film layer, the first connecting film layer, the panel and the second connecting film layer are sequentially arranged in a stacked mode, and the first connecting film layer and the second connecting film layer are adhered to the two sides of the panel respectively; wherein the first connecting film layer is provided with a plurality of first interfaces, and each first interface corresponds to at least one flat cable strip; any one of the first interfaces is used for exposing at least one flat cable strip, so that the battery cell can be connected with external acquisition equipment through the flat cable strip. The battery cell connecting assembly can simplify the structure, save the processing time and reduce the cost. The invention also provides a preparation method of the battery cell connection assembly and a battery pack.

Description

Technical Field

[0001] This application belongs to the field of conductive connection devices, and particularly relates to a battery cell connection component, a preparation method thereof, and a battery pack. Background Art

[0002] In the field of battery technology, the voltage detection of a battery pack is a key link to ensure battery performance and safety. At present, the voltage detection device of a battery pack mainly uses voltage acquisition lines as the connection medium between battery cells and acquisition devices (for example, voltage acquisition devices or temperature acquisition devices). Among them, these voltage acquisition lines mainly include wire harnesses, FPCs (Flexible Printed Circuit, that is, flexible circuit boards), and FFCs (Flat Flexible Cable, that is, flexible flat cables). However, there are many problems in the production and use of existing voltage acquisition lines.

[0003] First of all, the production and manufacturing process of wire harnesses mostly rely on manual operations, resulting in low production efficiency and difficulty in automation. This manual dependence not only increases production costs but also easily causes operation errors, thus affecting the overall performance and safety of the battery pack. In addition, wire harnesses also require a large amount of manual intervention in actual use, increasing installation time and complexity. Secondly, the manufacturing process of FPCs is relatively complex and usually requires processes such as etching, resulting in a long processing time and also facing challenges of manual operations in the production process. FFCs are similar to wire harnesses, with a large amount of manual operations in the production process, low automation, long installation time, and being easily damaged.

[0004] In addition, existing voltage acquisition lines are mostly exposed outside, easily affected and damaged by the external environment, thus affecting the stability and safety of the battery pack.

[0005] Furthermore, the versatility of existing voltage acquisition lines is also poor. For battery packs of different sizes and specifications, separate molds often need to be opened. This not only increases the upfront investment cost, especially in the case of small production batches, but also further increases production costs and cycles. These problems not only limit the optimization of battery pack performance but also increase the costs of battery maintenance and replacement. Summary of the Invention

[0006] In order to overcome or mitigate the deficiencies existing in the above-mentioned prior art, one object of this application is to provide a battery cell connection component, which can simplify the structure of the battery cell connection component, save processing time and installation time, and reduce production costs. Another object of this application is to provide a battery pack.

[0007] In order to achieve the above-mentioned invention objects, this application can adopt the following technical solutions.

[0008] The present application provides a battery cell connection component, which includes:

[0009] A panel, which is made of a conductive material and includes a plurality of strip lines. The plurality of strip lines are all disposed on the panel, and the plurality of strip lines are arranged side by side and spaced apart.

[0010] An insulating first connection film layer and an insulating second connection film layer. The first connection film layer, the panel, and the second connection film layer are stacked in sequence, and the first connection film layer and the second connection film layer are respectively adhered to both sides of the panel.

[0011] Wherein, the first connection film layer is provided with a plurality of first interfaces, and each first interface corresponds to at least one of the strip lines; any one of the first interfaces is used to expose at least one of the strip lines, so that the battery cell can be connected to an external voltage acquisition or temperature acquisition device through the strip lines.

[0012] In at least one alternative embodiment, the plurality of first interfaces are spaced apart along the length direction of the strip lines.

[0013] In at least one alternative embodiment, the battery cell connection component further includes a plurality of nickel sheets. For each nickel sheet, one end of the nickel sheet is connected to one of the strip lines through the first interface, and the other end of the nickel sheet is used to be connected to the battery cell.

[0014] In at least one alternative embodiment, the battery cell connection component further includes a plurality of NTC components. One end of each NTC component is connected to the strip line through at least one of the first interfaces, and the other end of each NTC component is connected to one end of at least one of the nickel sheets.

[0015] In at least one alternative embodiment, the battery cell connection component further includes a plurality of length adjusting members. A length adjusting member is disposed between each nickel sheet and the NTC component, and the length adjusting member is used to make the ends of the nickel sheets on the same side connected to the battery cell be on the same horizontal line.

[0016] In at least one alternative embodiment, the strip line is a straight structure, and the strip line is made of a circular die-cut copper foil or a rolled copper strip.

[0017] In at least one alternative embodiment, the first connection film layer is provided with a plurality of connector interfaces. The plurality of connector interfaces correspond to the plurality of strip lines one by one, and the plurality of connector interfaces are located at the same end of the plurality of strip lines; the connector interfaces are made by a die-cutting process or a laser process.

[0018] In at least one alternative embodiment, the cell connection assembly further includes a connector, and the connector is connected to a plurality of the strip lines through the connector interface.

[0019] The present application also provides a method for manufacturing a cell connection assembly for manufacturing the cell connection assembly of the present application, which includes: disposing a copper foil on a second connection film;

[0020] Processing a plurality of the strip lines on the copper foil through a die-cutting process, or providing rolled copper strips to form the strip lines, thereby forming the panel; and connecting the first connection film above the panel;

[0021] Processing a plurality of the connector interfaces and a plurality of the first interfaces on the first connection film through a die-cutting or laser-cutting process; pasting the NTC component at the first interface, pasting the nickel sheet to the NTC component, and installing the connector to the connector interface.

[0022] The present application also provides a battery pack, which includes a cell connection assembly and a plurality of cells, and each cell is connected to at least one of the strip lines through the first interface.

[0023] By adopting the above technical solutions, the present application provides a cell connection assembly, which includes a panel, an insulating first connection film layer, and an insulating second connection film layer. A plurality of strip lines are provided on the panel, and the plurality of strip lines are arranged at intervals; the first connection film layer, the panel, and the second connection film layer are stacked in sequence. By providing the first connection film layer and the second connection film layer, the fixation of a plurality of strip lines on the panel can be realized, and the strip lines can be protected. Among them, a plurality of first interfaces are opened on the first connection film layer, and each first interface corresponds to at least one strip line; any one of the first interfaces is used to expose at least one strip line, so that the cell can be connected to an external voltage acquisition or temperature acquisition device through the strip line. By opening the first interface, the strip line can be exposed to be connected to an external cell to collect the voltage or temperature of the cell and detect and monitor the cell. Through the above design, the structure of the cell connection assembly can be simplified, the processing time and installation time can be saved, the installation efficiency can be improved, and the strip lines can be protected to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a cell connection assembly from a first perspective according to an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of a cell connection assembly from a second perspective according to an embodiment of the present application;

[0026] Figure 3 is Figure 2 a partial enlarged schematic diagram at A in

[0027] Figure 4 Schematic diagram of the first perspective of the battery cell connection assembly including a nickel sheet and an NTC component provided for an embodiment of the present application;

[0028] Figure 5 Schematic diagram of the second perspective of the battery cell connection assembly including a nickel sheet and an NTC component provided for an embodiment of the present application;

[0029] Figure 6 Schematic diagram of the battery cell connection assembly including a connector provided for an embodiment of the present application;

[0030] Description of reference numerals

[0031] 1000 Battery cell connection assembly;

[0032] 100 First connection film layer;

[0033] 110 First interface;

[0034] 200 Second connection film layer;

[0035] 300 Panel;

[0036] 400 Row line;

[0037] 410 Connector interface;

[0038] 500 Nickel sheet;

[0039] 600 NTC component;

[0040] 700 Length adjuster;

[0041] 800 Connector Detailed implementation manners

[0042] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, rather than to exhaust all feasible ways of the present application, nor to limit the scope of the present application.

[0043] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the present application, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0045] In addition, if terms such as "first", "second", etc. are only used for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0046] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0047] The following further describes the present application in detail with reference to the accompanying drawings of the specification and specific embodiments.

[0048] As Figure 1 、 Figure 2 and Figure 3 shown, an embodiment of the present application provides a cell connection assembly 1000, which may include a panel 300, a first connection film layer 100, and a second connection film layer 200. Among them, the panel 300 may be provided with a plurality of row lines 400, and the plurality of row lines 400 may be arranged side by side and at intervals.

[0049] In this embodiment, the first connection film layer 100 and the second connection film layer 200 may be respectively adhered to both sides of the panel 300. Among them, the panel 300 may be a conductive material, such as copper; the first connection film layer 100 and the second connection film layer 200 may be insulating materials, such as polyimide film (PI film). It can be understood that by setting the first connection film layer 100 and the second connection film layer 200, both the fixation of the plurality of row lines 400 on the panel 300 can be realized, and the row lines 400 can be protected. The row lines 400 can be used to connect the cells and voltage acquisition or temperature acquisition devices to detect and monitor the voltage or temperature of the cells in real time to ensure the normal operation of the cells.

[0050] In this embodiment, the first connection film layer 100, the panel 300, and the second connection film layer 200 may be sequentially stacked. Among them, the first connection film layer 100 may be provided with a plurality of first interfaces 110, and each first interface 110 may correspond to at least one row line 400. In addition, any one of the first interfaces 110 may be used to expose at least one row line 400, so that the cells can be connected to external voltage acquisition or temperature acquisition devices through the row lines 400. The length ( Figure 3 in the up and down direction) and width ( Figure 3The left - right direction (which can be determined according to the actual product situation and is not limited herein).

[0051] By providing the first interface 110, the wiring strip 400 can be exposed to connect with the external battery cells to collect the voltage or temperature of the battery cells for detecting and monitoring the battery cells.

[0052] For facilitating the connection between the wiring strip 400 and multiple battery cells, please refer to Figure 2 and in combination with Figure 3 In this embodiment, the multiple first interfaces 110 can be arranged at intervals along the length direction of the wiring strip 400 (i.e., Figure 3 the up - down direction). In this embodiment, the interval distance between two adjacent first interfaces 110 can be the thickness of the battery cell. Of course, the interval distance between two adjacent first interfaces 110 can also be other values, as long as it is convenient for each battery cell to connect with the wiring strip 400, and it is not limited herein.

[0053] In this way, the distance between adjacent first interfaces 110 can be determined according to the sizes of different battery cells, so that the battery cell connection component of the present application can be adapted to various battery cells with different size specifications, having a wider applicability. Refer to Figure 4 and Figure 5 In this embodiment, the battery cell connection component 1000 may further include multiple nickel sheets 500. For each nickel sheet 500, one end of the nickel sheet 500 can be connected to a wiring strip 400 through the first interface 110, and the other end of the nickel sheet 500 can be used to connect with the battery cell.

[0054] In this embodiment, the nickel sheet 500 has characteristics such as good electrical conductivity, stability, and corrosion resistance, and plays an important conduction role inside the battery. Nickel sheets 500 are needed for both the positive and negative electrodes inside the battery to carry and conduct electric charges, which can ensure the stable transmission of electric charges inside the battery, prevent the loss of electric charges during the process, and thus improve the efficiency of the battery.

[0055] Continuing to refer to Figure 4 and Figure 5 In this embodiment, the battery cell connection component 1000 may further include multiple NTC components 600. One end of each NTC component 600 can be connected to the wiring strip 400 through at least one first interface 110, and the other end of each NTC component 600 can be connected to one end of at least one nickel sheet 500. Specifically, each NTC component 600 can be installed and connected to the wiring strip 400 by means of surface mounting and fixed with soldering.

[0056] Refer to Figure 5, it can be understood that the square area outside the first interface 110 in the figure can represent the pad area, that is, the welding area when the external device is connected to the wiring strip 400. In addition, the area shown by the dotted line in the figure can represent the welding area when the wiring strip 400 is connected to the nickel sheet 500, and the area shown by the solid line below can represent the welding area when the wiring strip 400 is connected to the positive and negative electrodes of the NTC component 600. Preferably, a fuse (shown as a serpentine curve in the figure) can also be provided on the wiring strip 400 to prevent the wiring strip 400 from short-circuiting.

[0057] Further, in this embodiment, each NTC component 600 can cover one or more first interfaces 110, and it can be connected to one wiring strip 400 or multiple wiring strips 400 through one or more first interfaces 110. One end of an NTC component 600 in this embodiment can be connected to a wiring strip 400 through a first interface 110, and the other end of this NTC component 600 can be connected to a nickel sheet 500. It can be understood that when multiple first interfaces 110 and multiple nickel sheets 500 are arranged closely, an NTC component 600 can be connected to multiple different wiring strips 400 through two, three, four or more first interfaces 110.

[0058] Still further, the NTC component 600 includes an NTC thermistor installed in the battery pack. The NTC thermistor is a negative temperature coefficient thermistor, and its resistance value decreases as the temperature increases. The NTC component 600 can be connected in series in the power supply circuit, which can effectively suppress the inrush current when starting up and protect the battery and the circuit. Moreover, when the battery temperature rises, the resistance value of the NTC thermistor will decrease. The battery charging control IC judges the battery temperature by detecting the change of the voltage value, so as to stop charging or discharging when the temperature is too high, preventing the battery from overheating and exploding. The NTC component 600 can play an important role in battery protection through its negative temperature coefficient characteristic, effectively suppressing the inrush current and detecting the battery temperature to ensure the safe use of the battery. Of course, the NTC component 600 can be replaced by a PTC component (Positive Temperature Coefficient), or other structural components that can protect the battery during overcharging of the battery, which is not limited here.

[0059] Refer to Figure 4, in this embodiment, the battery cell connection assembly 1000 may include a plurality of length adjusting members 700, and a length adjusting member 700 may be provided between each nickel sheet 500 and the NTC assembly 600. The length adjusting member 700 can be used to make the ends of the nickel sheets 500 on the same side connected to the battery cells be on the same horizontal line. If the length adjusting member 700 is provided on the battery cell connection assembly 1000, the same model of NTC assembly 600 and nickel sheets 500 of the same size can be selected to improve versatility, thereby saving processing and installation time. Of course, the length adjusting member 700 may not be provided, and the length of the nickel sheet 500 can be determined according to the straight-line distance from the first interface 110 to the battery cell.

[0060] In the existing etching process used in FPC production, a large amount of waste liquid, waste gas, noise, dust and other pollutants will be generated, which cause serious harm to the environment and human health, including polluting water bodies and soil, affecting air quality, and causing long-term damage to the health of workers.

[0061] In order to reduce environmental pollution and ensure the health of operators, in this embodiment, the battery cell connection assembly 1000 can be made by die-cutting process. In this way, the degree of automation can be improved, the number of on-site production operators can be reduced, and the processing and production efficiency can be improved, thereby saving processing and installation time.

[0062] In this embodiment, the wiring strip 400 may include a straight structure, and the wiring strip 400 can be made by a round die-cutting process. Further, the wiring strip 400 can also be made by a rolled copper strip process, that is, copper foil is obtained by physical rolling. And the first interface 110 can be made by die-cutting process or laser process.

[0063] Refer to Figure 2 and Figure 3 . In this embodiment, the first connection film layer 100 may be provided with a plurality of connector interfaces 410. Among them, the plurality of connector interfaces 410 can correspond to the plurality of wiring strips 400 one by one, and the plurality of connector interfaces 410 can be located at the same end of the plurality of wiring strips 400. In addition, the plurality of connector interfaces 410 can also be used to expose the plurality of wiring strips 400.

[0064] Further, the plurality of connector interfaces 410 can be made by die-cutting process or laser process.

[0065] To facilitate the connection of the plurality of wiring strips 400 to voltage acquisition or temperature acquisition devices and simplify the connection lines, please refer to Figure 6 . As Figure 6 shown, in this embodiment, the battery cell connection assembly 1000 may further include a connector 800, and the connector 800 can be connected to the plurality of wiring strips through the connector interface 410.

[0066] In addition, an embodiment of the present application further provides a method for manufacturing an electrical connector. The processing and forming steps thereof include:

[0067] First, lay a second connection film layer 200, then select a copper foil raw material in the same form as the FPC, i.e., a panel 300, and place it above the second connection film layer 200. Then, use a die-cutting process (such as a circular die) to divide the copper foil into multiple row lines 400 at certain intervals. After cutting the row lines 400, connect a first connection film layer 100 above the panel 300. Then, use a die-cutting process to cut out multiple connector interfaces 410 on the first connection film layer 100. The multiple connector interfaces 410 are located at the same end of the multiple row lines 400, and the multiple connector interfaces 410 correspond to the multiple row lines 400 one by one to expose the row lines 400. Next, use a die-cutting process to cut out multiple first interfaces 110 on the first connection film layer 100. Then, paste the NTC component 600 at the first interfaces 110, and paste the nickel sheet 500 to the NTC component 600. Finally, install the connector 800 to the connector interfaces 410.

[0068] Furthermore, laser cutting or other methods can be used to process the connector interfaces 410 and the first interfaces 110. The specific processing method is not limited herein.

[0069] Furthermore, the panel 300 can be made of rolled copper strips. In this way, the wiring diagram (i.e., the row lines 400) can be pre-designed during the production process of the rolled copper strips, so that the row lines 400 do not need to be processed by a die-cutting process subsequently. This will further reduce the production cost and improve the production efficiency.

[0070] By adopting the above solution, in the cell connection component of the present application, the first connection film layer 100 and the second connection film layer 200 can not only fix the multiple row lines 400 on the panel 300, but also play a protective role for the row lines 400. By opening the first interfaces 110, the row lines 400 can be exposed to be connected to external cells to collect the voltage or temperature of the cells and detect and monitor the cells. At the same time, through the above design, while simplifying the structure of the cell connection component 1000, saving the processing time, and improving the installation efficiency, it can also play a certain protective role for the row lines 400. In addition, since the position of the first interfaces 110 can be flexibly set, the cell connection component of the present application can be adapted to various cell sizes and specifications, so that it is not necessary to separately mold each different product, thereby reducing the production cost.

[0071] Embodiments of the present application also provide a battery pack, which includes a cell connection component 1000 and a plurality of cells. Each cell is connected to at least one bus bar 400 through a first interface 110. Specifically, one bus bar 400 can be connected to one cell, or one bus bar 400 can be connected to multiple cells, which is not limited herein.

[0072] Preferably, in order to facilitate the detection and monitoring of each cell, one bus bar 400 in this embodiment is only connected to one cell, so as to detect and control one by one, ensuring that the control between each cell is not affected by each other. According to the actual usage, the battery pack may further include other structural components such as a liquid cooling component to achieve various functions, which is not limited herein.

[0073] In addition, according to the cell connection component of the present application, it can also be extended and applied to other electrical devices, including but not limited to module units in battery management systems, electrical interface devices of smart grid devices, battery pack connection systems of electric vehicles, and portable electronic devices, etc. Many fields are not listed one by one here.

[0074] It should be understood that the above embodiments are merely exemplary and do not limit the present application. Those skilled in the art can make various modifications and changes to the above embodiments under the teaching of the present application without departing from the scope of the present application.

Claims

1. A battery cell connection component, characterized in that, Comprising: A panel (300) made of a conductive material and including a plurality of strip lines (400), the plurality of strip lines (400) are all disposed on the panel (300), and the plurality of strip lines (400) are arranged side by side and spaced apart; An insulating first connection film layer (100) and an insulating second connection film layer (200), the first connection film layer (100), the panel (300) and the second connection film layer (200) are stacked in sequence, and the first connection film layer (100) and the second connection film layer (200) are respectively adhered to both sides of the panel (300); Wherein, the first connection film layer (100) is provided with a plurality of first interfaces (110), each first interface (110) corresponds to at least one of the strip lines (400); any one of the first interfaces (110) is used to expose at least one of the strip lines (400), so that the battery cell can be connected to an external voltage acquisition or temperature acquisition device through the strip lines (400).

2. The cell connection assembly according to claim 1, wherein, The plurality of first interfaces (110) are arranged at intervals along the length direction of the strip lines (400).

3. The cell connection assembly according to claim 1, wherein The battery cell connection assembly further includes a plurality of nickel sheets (500). For each nickel sheet (500), one end of the nickel sheet (500) is connected to one of the strip lines (400) through the first interface (110), and the other end of the nickel sheet (500) is used to connect to the battery cell.

4. The cell connection component according to claim 3, wherein The battery cell connection assembly further includes a plurality of NTC components (600). One end of each NTC component (600) is connected to the strip line (400) through at least one of the first interfaces (110), and the other end of each NTC component (600) is connected to one end of at least one of the nickel sheets (500).

5. The battery cell connection assembly according to claim 4, wherein, The battery cell connection assembly further includes a plurality of length adjusting members (700). A length adjusting member (700) is disposed between each nickel sheet (500) and the NTC component (600), and the length adjusting member (700) is used to make the ends of the nickel sheets (500) connected to the battery cell on the same side be on the same horizontal line.

6. The cell connection assembly according to any one of claims 1 to 5, characterized in that, The strip line (400) is a straight structure, and the strip line (400) is made of a round die-cut copper foil or made of a rolled copper strip.

7. The battery cell connection assembly according to any one of claims 1 to 5, characterized in that, The first connection film layer (100) is provided with a plurality of connector interfaces (410), the plurality of connector interfaces (410) correspond to the plurality of strip lines (400) one by one, and the plurality of connector interfaces (410) are located at the same end of the plurality of strip lines (400); the connector interfaces (410) are made by a die-cutting process or a laser process.

8. The cell connection assembly according to claim 7, wherein, The battery cell connection assembly further includes a connector (800), and the connector (800) is connected to the plurality of strip lines (400) through the connector interfaces (410).

9. A preparation method of a battery cell connection assembly for preparing the battery cell connection assembly according to any one of claims 1 to 8, characterized in that, The preparation method includes: Setting a copper foil on the second connection film (200); A plurality of the row lines (400) are processed on the copper foil by a die-cutting process, or a rolled copper strip is provided to form the row lines (400), thereby forming the panel (300); and the first connection film (100) is connected above the panel (300); A plurality of connector interfaces (410) and a plurality of the first interfaces (110) are processed on the first connection film (100) by a die-cutting or laser-cutting process; The NTC component (600) is pasted at the first interface (100), the nickel sheet (500) is pasted to the NTC component (600), and the connector (800) is installed at the connector interface (410).

10. A battery pack, characterized in that, It includes the battery cell connection component according to any one of claims 1-8 and a plurality of battery cells, and each battery cell is connected to at least one of the row lines (400) through the first interface (110).

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