Flexible circuit board and battery pack
Through the parallel and serial and parallel plate connection of the flexible circuit board, multiple batteries are directly welded, solving the problems of complex structure and high cost of traditional CCS components, and achieving efficient serial and parallel connection of the battery and increasing current and voltage.
Patent Information
- Application Number
- CN202411400973.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2024-12-24
AI Technical Summary
Traditional CCS components realize multiple batteries in series and parallel connection through busbars, resulting in complex structure and high production costs.
The flexible circuit board is adopted to realize the serial and parallel connection of batteries through spaced parallel plates and series-parallel plates. There is no need to use busbars and plastic brackets, and multiple batteries are directly welded to the flexible circuit board to simplify the structure and process flow.
The series and parallel connection of multiple batteries is realized, which increases the output current and voltage, while simplifies the structure and process flow and reduces the production cost.
Smart Images
Figure CN119183246A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of flexible circuit boards, and specifically relates to a flexible circuit board and a battery pack. Background Art
[0002] The CCS (Cells Contact System, integrated busbar) in the field of battery technology is an important component of the battery pack, which can not only connect multiple batteries in series and parallel, but also collect the voltage signal and temperature signal of the battery, and transmit the collected voltage signal and temperature signal to the BMS (Battery Management System, battery management system). Traditional CCS components generally realize multiple batteries in series and parallel through a bus. Generally, two parallel buses and one or more series-parallel buses located between the two parallel buses are required. One of the parallel buses is composed of multiple positive electrode connecting plates, and the positive electrode connecting plates are used to weld the positive electrode of the battery. The other parallel bus is composed of multiple negative electrode connecting plates, and the negative electrode connecting plates are used to weld the negative electrode of the battery. The series-parallel bus is composed of multiple positive electrode connecting plates and multiple negative electrode connecting plates, which has the problems of complex structure and high production cost. Summary of the invention
[0003] The purpose of the present application is to provide a flexible circuit board and a battery pack, aiming to solve the technical problem in the prior art that the CCS assembly realizes multiple batteries in series and parallel through a bus, resulting in a complex structure and high manufacturing cost.
[0004] On the one hand, to achieve the above-mentioned purpose, the technical solution adopted in the present application is: a flexible circuit board, comprising a first conductive layer, the first conductive layer comprising a first parallel plate, a second parallel plate and a series-parallel plate arranged at intervals, the first parallel plate is provided with N electrically connected first positive electrode welding points, the second parallel plate is provided with N electrically connected first negative electrode welding points, the series-parallel plate is provided with N electrically connected second positive electrode welding points and N electrically connected second negative electrode welding points, the N second positive electrode welding points are respectively electrically connected to the N second negative electrode welding points, the N first positive electrode welding points correspond one-to-one to the N second negative electrode welding points, and the N first negative electrode welding points correspond one-to-one to the N second positive electrode welding points.
[0005] Compared with the prior art, the flexible circuit board provided by the present application has the following beneficial effects: when welding batteries, N first positive electrode welding points and N second negative electrode welding points are grouped in one-to-one correspondence, and the grouped first positive electrode welding points and second negative electrode welding points are respectively welded to the positive and negative electrodes of the same battery, and N first negative electrode welding points and N second positive electrode welding points are grouped in one-to-one correspondence, and the grouped first negative electrode welding points and second positive electrode welding points are respectively welded to the negative and positive electrodes of the same battery, thereby enabling multiple batteries to be connected in series and parallel, while increasing the output current and voltage. The present application directly welds multiple batteries on a flexible circuit board to achieve multiple batteries in series and parallel connection, without the need for a bus bar and a plastic bracket for fixing the bus bar, thereby achieving the purpose of simplifying the structure, simplifying the process flow and reducing the production cost.
[0006] Furthermore, there are multiple series-parallel plates, which are arranged at intervals, and the second negative electrode welding point corresponding to the first positive electrode welding point and the second positive electrode welding point corresponding to the first negative electrode welding point are respectively located in two series-parallel plates; for two adjacent series-parallel plates, the N second positive electrode welding points of one series-parallel plate correspond one-to-one with the N second negative electrode welding points of the other series-parallel plate.
[0007] Further, the first parallel plate and the second parallel plate are sequentially arranged along the first direction, and the plurality of series-parallel plates are arranged between the first parallel plate and the second parallel plate, and are arranged at intervals along the first direction;
[0008] N first positive electrode welding points are arranged at intervals along the second direction, N first negative electrode welding points are arranged at intervals along the second direction, N second positive electrode welding points located in the same series-parallel plate are arranged at intervals along the second direction, and N second negative electrode welding points located in the same series-parallel plate are arranged at intervals along the second direction, and the second direction is perpendicular to the first direction;
[0009] The N first positive electrode welding points correspond one-to-one with the N second negative electrode welding points of the adjacent series-parallel plates in the first direction, and the N first negative electrode welding points correspond one-to-one with the N second positive electrode welding points of the adjacent series-parallel plates in the first direction. For two adjacent series-parallel plates, the N second positive electrode welding points of one series-parallel plate correspond one-to-one with the N second negative electrode welding points of the other series-parallel plate in the first direction.
[0010] Furthermore, the flexible circuit board also includes a first covering layer, which covers the first conductive layer, and the first covering layer is provided with through holes at positions corresponding to the first positive electrode welding point, the first negative electrode welding point, the second positive electrode welding point and the second negative electrode welding point.
[0011] Furthermore, the first parallel plate is also provided with a positive pole ear, which is electrically connected to each first positive electrode welding point, and the second parallel plate is also provided with a negative pole ear, which is electrically connected to each first negative electrode welding point; the first covering layer is provided with through holes at positions corresponding to the positive pole ear and the negative pole ear.
[0012] Furthermore, the flexible circuit board is also provided with a voltage collection line and a temperature collection line, and the voltage collection line is electrically connected to the first conductive layer.
[0013] Furthermore, the flexible circuit board includes a first conductive layer, an insulating layer and a second conductive layer stacked in sequence, the voltage collection line and the temperature collection line are both arranged in the second conductive layer, and the flexible circuit board is provided with a conductive hole, and the two ends of the conductive hole are respectively electrically connected to the first conductive layer and the voltage collection line.
[0014] Furthermore, the second conductive layer is further provided with a first pad, a second pad and a third pad, the first pad is located at an end of the voltage collection line away from the conductive hole, and the second pad and the third pad are respectively located at two ends of the temperature collection line;
[0015] The flexible circuit board also includes a second covering layer, which covers the second conductive layer. The second covering layer is provided with through holes at positions corresponding to the first pad, the second pad and the third pad.
[0016] On the other hand, to achieve the above-mentioned purpose, the technical solution adopted in the present application is: a battery pack, comprising multiple batteries and a flexible circuit board as mentioned above, the first positive electrode welding point is welded to the positive electrode of the battery, the first negative electrode welding point is welded to the negative electrode of the battery, the second positive electrode welding point is welded to the positive electrode of the battery, and the second negative electrode welding point is welded to the negative electrode of the battery.
[0017] Compared with the prior art, the battery pack provided by the present application has the following beneficial effects: when welding batteries, N first positive electrode welding points and N second negative electrode welding points are grouped in one-to-one correspondence, and the grouped first positive electrode welding points and second negative electrode welding points are respectively welded to the positive and negative electrodes of the same battery, and N first negative electrode welding points and N second positive electrode welding points are grouped in one-to-one correspondence, and the grouped first negative electrode welding points and second positive electrode welding points are respectively welded to the negative and positive electrodes of the same battery, thereby enabling multiple batteries to be connected in series and parallel, while increasing the output current and voltage. The present application directly welds multiple batteries on a flexible circuit board to achieve multiple batteries in series and parallel connection, without the need to use a bus bar and a plastic bracket for fixing the bus bar, thereby achieving the purpose of simplifying the structure, simplifying the process flow and reducing the production cost.
[0018] Furthermore, the battery pack also includes a temperature sensing element and a battery management system. The flexible circuit board is provided with a voltage collection line and a temperature collection line. One end of the voltage collection line is electrically connected to the first conductive layer, one end of the temperature collection line is electrically connected to the temperature sensing element, and the other end of the voltage collection line and the other end of the temperature collection line are both electrically connected to the battery management system. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0020] Figure 1 A cross-sectional view of a flexible circuit board provided in an embodiment of the present application;
[0021] Figure 2 A schematic diagram of the structure of the first conductive layer of the flexible circuit board provided in an embodiment of the present application;
[0022] Figure 3 for Figure 2 A schematic diagram of the structure of the first conductive layer after being covered with the first covering layer;
[0023] Figure 4 A schematic diagram of the structure of the second conductive layer of the flexible circuit board provided in an embodiment of the present application;
[0024] Figure 5 for Figure 4 An enlarged view of the second conductive layer at position A is shown;
[0025] Figure 6 for Figure 4 A schematic diagram of the structure of the second conductive layer after being covered with a second covering layer;
[0026] Figure 7 A cross-sectional view of a battery pack provided in an embodiment of the present application;
[0027] Figure 8 for Figure 7 A top view of the batteries of the battery pack is shown.
[0028] Among them, the reference numerals in the figure are:
[0029] 100, flexible circuit board; 10, first conductive layer; 11, first parallel block; 111, first positive electrode solder joint; 112, positive electrode tab; 12, second parallel block; 121, first negative electrode solder joint; 122, negative electrode tab; 13, series-parallel block; 131, second positive electrode solder joint; 132, second negative electrode solder joint; 20, first covering layer; 30, insulating layer; 31, first substrate layer; 32, second substrate layer; 33, adhesive layer; 40, second conductive layer; 41, voltage acquisition line; 42, temperature acquisition line; 43, first pad; 44, second pad; 45, third pad; 46, fourth pad; 50, conductive hole; 60, second covering layer;
[0030] 200, battery; 201, positive electrode; 202, negative electrode;
[0031] 300. Temperature sensing element. DETAILED DESCRIPTION
[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.
[0033] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0036] Please also read Figures 1 to 3 The embodiment of the present application provides a flexible circuit board 100, including a first conductive layer 10, the first conductive layer 10 includes a first parallel plate 11, a second parallel plate 12 and a series-parallel plate 13 arranged at intervals, the first parallel plate 11 is provided with N electrically connected first positive electrode welding points 111, the second parallel plate 12 is provided with N electrically connected first negative electrode welding points 121, the series-parallel plate 13 is provided with N electrically connected second positive electrode welding points 131 and N electrically connected second negative electrode welding points 132, the N second positive electrode welding points 131 are electrically connected to the N second negative electrode welding points 132 respectively, the N first positive electrode welding points 111 correspond to the N second negative electrode welding points 132 one by one, and the N first negative electrode welding points 121 correspond to the N second positive electrode welding points 131 one by one.
[0037] When welding batteries, N first positive electrode welding points 111 and N second negative electrode welding points 132 are grouped in one-to-one correspondence, and the grouped first positive electrode welding points 111 and second negative electrode welding points 132 are respectively welded to the positive and negative electrodes of the same battery, and N first negative electrode welding points 121 and N second positive electrode welding points 131 are grouped in one-to-one correspondence, and the grouped first negative electrode welding points 121 and second positive electrode welding points 131 are respectively welded to the negative and positive electrodes of the same battery, so that multiple batteries can be connected in series and parallel, and the output current and voltage can be increased at the same time. The present application directly welds multiple batteries on the flexible circuit board 100 to realize multiple batteries in series and parallel connection, without the need to use a bus bar and a plastic bracket for fixing the bus bar, thereby achieving the purpose of simplifying the structure, simplifying the process flow and reducing the production cost.
[0038] Specifically, the first parallel plate 11 is spaced apart from the series-parallel plate 13, so that the first positive electrode welding point 111 is separated from the second negative electrode welding point 132 and is not directly connected for conduction, so as to avoid a short circuit when welding the battery. Similarly, the second parallel plate 12 is spaced apart from the series-parallel plate 13, so that the first negative electrode welding point 121 is separated from the second positive electrode welding point 131 and is not directly connected for conduction, so as to avoid a short circuit when welding the battery. For the sake of convenience of explanation, the battery welded at the first positive electrode welding point 111 and the second negative electrode welding point 132 is named as the first battery, and the battery welded at the first negative electrode welding point 121 and the second positive electrode welding point 131 is named as the second battery, the second positive electrode welding point 131 and the second negative electrode welding point 132 are electrically connected through the series-parallel plate 13, so that the first battery and the second battery are connected in series, N first positive electrode welding points 111 are electrically connected through the first parallel plate 11, N first negative electrode welding points 121 are electrically connected through the second parallel plate 12, N second positive electrode welding points 131 are electrically connected through the series-parallel plate 13, and N second negative electrode welding points 132 are electrically connected through the series-parallel plate 13, so that N first batteries are connected in parallel and N second batteries are connected in parallel, thereby realizing multiple batteries in series and parallel.
[0039] In one embodiment, in combination Figure 1 and Figure 2 There are multiple series-parallel blocks 13, and the multiple series-parallel blocks 13 are arranged at intervals. The second negative electrode welding point 132 corresponding to the first positive electrode welding point 111 and the second positive electrode welding point 131 corresponding to the first negative electrode welding point 121 are respectively located in two series-parallel blocks 13; for two adjacent series-parallel blocks 13, the N second positive electrode welding points 131 of one series-parallel block 13 correspond to the N second negative electrode welding points 132 of the other series-parallel block 13.
[0040] For the sake of ease of explanation, it is assumed that the number of series-parallel blocks 13 is three, and the three series-parallel blocks 13 are named the first series-parallel block, the second series-parallel block and the third series-parallel block, respectively, wherein the first series-parallel block is adjacent to the first parallel block 11, the third series-parallel block is adjacent to the second parallel block 12, and the second series-parallel block is located between the first series-parallel block and the third series-parallel block.
[0041] The N first positive electrode welding points 111 of the first parallel block 11 and the N second negative electrode welding points 132 of the first series parallel block are grouped in correspondence, and the grouped first positive electrode welding points 111 and second negative electrode welding points 132 are respectively welded to the positive electrode and negative electrode of the same battery. Here, the battery welded to the first parallel block 11 and the first series parallel block is named as the first battery.
[0042] The N second positive electrode welding points 131 of the first series-parallel plate and the N second negative electrode welding points 132 of the second series-parallel plate are grouped in a one-to-one correspondence. The grouped second positive electrode welding points 131 and second negative electrode welding points 132 are respectively welded to the positive and negative electrodes of the same battery. Here, the battery welded to the first series-parallel plate and the second series-parallel plate is named as the second battery.
[0043] The N second positive electrode welding points 131 of the second series-parallel plate and the N second negative electrode welding points 132 of the third series-parallel plate are grouped in a one-to-one correspondence. The grouped second positive electrode welding points 131 and second negative electrode welding points 132 are respectively welded to the positive and negative electrodes of the same battery. Here, the battery welded to the second series-parallel plate and the third series-parallel plate is named as the third battery.
[0044] The N second positive electrode welding points 131 of the third series-parallel plate and the N first negative electrode welding points 121 of the second parallel plate 12 are grouped in a one-to-one correspondence. The grouped second positive electrode welding points 131 and first negative electrode welding points 121 are respectively welded to the positive electrode and negative electrode of the same battery. Here, the battery welded to the third series-parallel plate and the second parallel plate 12 is named as the fourth battery.
[0045] The relationship between the batteries is: the first battery, the second battery, the third battery and the fourth battery are connected in series in sequence, N first batteries are connected in parallel, N second batteries are connected in parallel, N third batteries are connected in parallel, and N fourth batteries are connected in parallel.
[0046] Of course, the number of the series-parallel blocks 13 may also be two, four or more than four. In this embodiment, by increasing the number of the series-parallel blocks 13, the number of batteries connected in series can be increased, thereby increasing the output voltage.
[0047] In one embodiment, in combination Figure 2 and Figure 3As shown, the first parallel plate 11 and the second parallel plate 12 are sequentially arranged along the first direction, and the plurality of series-parallel plates 13 are arranged between the first parallel plate 11 and the second parallel plate 12, and are arranged at intervals along the first direction; the N first positive electrode welding points 111 are arranged at intervals along the second direction, the N first negative electrode welding points 121 are arranged at intervals along the second direction, the N second positive electrode welding points 131 located in the same series-parallel plate 13 are arranged at intervals along the second direction, and the N second negative electrode welding points 132 located in the same series-parallel plate 13 are arranged at intervals along the second direction. The N first positive electrode welding points 111 correspond one-to-one with the N second negative electrode welding points 132 of the adjacent series-parallel blocks 13 in the first direction, and the N first negative electrode welding points 121 correspond one-to-one with the N second positive electrode welding points 131 of the adjacent series-parallel blocks 13 in the first direction. For two adjacent series-parallel blocks 13, the N second positive electrode welding points 131 of one series-parallel block 13 correspond one-to-one with the N second negative electrode welding points 132 of the other series-parallel block 13 in the first direction.
[0048] The N first positive electrode welding points 111 are arranged at intervals along the second direction, and correspond one-to-one in the first direction to the N second negative electrode welding points 132 of the adjacent series-parallel blocks 13 which are also arranged at intervals along the second direction, so that a row of batteries neatly arranged along the second direction can be obtained when welding the batteries; the N first negative electrode welding points 121 are arranged at intervals along the second direction, and correspond one-to-one in the first direction to the N second positive electrode welding points 131 of the adjacent series-parallel blocks 13 which are also arranged at intervals along the second direction, so that a row of batteries neatly arranged along the second direction can be obtained when welding the batteries; for each two adjacent series-parallel blocks 13, the N second positive electrode welding points 131 of one series-parallel block 13 which are arranged at intervals along the second direction correspond one-to-one in the first direction to the N second negative electrode welding points 132 of the other series-parallel block 13 which are also arranged at intervals along the second direction, so that a row of batteries neatly arranged along the second direction can be obtained when welding the batteries. Since the first parallel plate 11 and the second parallel plate 12 are arranged in sequence along the first direction, and the plurality of series-parallel plates 13 are arranged between the first parallel plate 11 and the second parallel plate 12 along the first direction, the obtained plurality of columns of batteries are arranged along the first direction, thereby satisfying the distribution of the plurality of batteries in the form of a matrix, that is, obtaining batteries in multiple rows and columns.
[0049] In one embodiment, in combination Figure 2 and Figure 3 As shown, the second positive electrode welding point 131 and the second negative electrode welding point 132 located in the same series-parallel block 13 are staggered in the second direction, which is particularly suitable for welding cylindrical batteries, and can make the cylindrical batteries more densely distributed, thereby helping to reduce the overall volume. The first positive electrode welding point 111 and the second positive electrode welding point 131 are both circular, and Figure 8The shape of the positive electrode 201 of the cylindrical battery 200 shown in FIG. 1 is adapted, and the first negative electrode welding point 121 and the second negative electrode welding point 132 are both semicircular ring-shaped. Figure 8 Of course, in some other embodiments, the N second positive electrode welding points 131 and the N second negative electrode welding points 132 located in the same series-parallel block 13 can correspond to each other in the first direction, which is particularly suitable for welding square shell batteries and can meet the requirements of multiple square shell batteries being distributed in a standard matrix, that is, the batteries in each row and column are distributed in a straight line.
[0050] In one embodiment, in combination Figure 1 , Figure 2 and Figure 3 As shown, the flexible circuit board 100 also includes a first covering layer 20, which covers the first conductive layer 10, and the first covering layer 20 has through holes at positions corresponding to the first positive electrode welding point 111, the first negative electrode welding point 121, the second positive electrode welding point 131 and the second negative electrode welding point 132.
[0051] The portion of the first conductive layer 10 covered by the first covering layer 20 is equivalent to a "circuit". The "circuit" of the first parallel block 11 electrically connects the N first positive electrode welding points 111, the "circuit" of the second parallel block 12 electrically connects the N first negative electrode welding points 121, and the "circuit" of the series-parallel block 13 electrically connects the second positive electrode welding point 131 and the second negative electrode welding point 132, and also connects the N second positive electrode welding points 131 and the N second negative electrode welding points 132. The first covering layer 20 covers these "circuits" to prevent the "circuits" from being exposed, thereby playing a protective role. By opening a through hole in the first covering layer 20, the first positive electrode welding point 111, the first negative electrode welding point 121, the second positive electrode welding point 131 and the second negative electrode welding point 132 are exposed, thereby satisfying the welding of the battery.
[0052] In one embodiment, in combination Figure 2 and Figure 3 As shown, the first parallel plate 11 is also provided with a positive pole ear 112, and the positive pole ear 112 is electrically connected to each first positive electrode welding point 111. The second parallel plate 12 is also provided with a negative pole ear 122, and the negative pole ear 122 is electrically connected to each first negative electrode welding point 121. The positive pole ear 112 cooperates with the negative pole ear 122 to connect to an external power supply device or an electrical device; the first covering layer 20 is provided with through holes at positions corresponding to the positive pole ear 112 and the negative pole ear 122.
[0053] The "circuit" of the first parallel block 11 covered by the first covering layer 20 also makes the positive pole tab 112 electrically connected to the N first positive electrode welding points 111, and the "circuit" of the second parallel block 12 covered by the first covering layer 20 also makes the negative pole tab 122 electrically connected to the N first negative electrode welding points 121. Through holes are opened in the first covering layer 20 to expose the positive pole tab 112 and the negative pole tab 122 respectively, so that the positive pole tab 112 and the negative pole tab 122 are connected to an external charging device or an electric device. When the positive pole tab 112 and the negative pole tab 122 are connected to an external charging device, the external charging device can charge the battery welded on the first conductive layer 10, and when the positive pole tab 112 and the negative pole tab 122 are connected to an external electric device, the battery welded on the first conductive layer 10 can provide electric energy to the external electric device. Traditional CCS components generally use conductive metal sheets as positive pole tabs 112 and negative pole tabs 122, and the positive pole tabs 112 and negative pole tabs 122 are installed and fixed on the busbar. However, the present application forms the first positive electrode welding point 111, the first negative electrode welding point 121, the second positive electrode welding point 131, the second negative electrode welding point 132, the positive pole tab 112 and the negative pole tab 122 on the first conductive layer 10 at the same time, without the need to additionally set up a busbar and a plastic bracket for fixing the busbar, and without additionally installing the positive and negative pole tabs 122 on the busbar, thereby achieving the purpose of simplifying the structure, simplifying the process flow and reducing the production cost. Specifically, the middle part of the positive pole tab 112 and the middle part of the negative pole tab 122 are processed with elliptical holes for connecting the cables of the charging device or the power-consuming device.
[0054] In one embodiment, Figure 4 As shown, the flexible circuit board 100 is also provided with a voltage acquisition line 41 and a temperature acquisition line 42, and the voltage acquisition line 41 is electrically connected to the first conductive layer 10. One end of the temperature acquisition line 42 is used to connect the temperature sensing element, and the other end of the temperature acquisition line 42 and the end of the voltage acquisition line 41 away from the first conductive layer 10 are both used to connect the battery management system. When working, the voltage acquisition line 41 can collect the voltage signal of the battery welded on the first conductive layer 10, and transmit the collected voltage signal to the battery management system, which monitors and manages the battery. The temperature sensing element connected to the temperature acquisition line 42 can collect the temperature signal of the battery welded on the first conductive layer 10, and the collected temperature signal is transmitted to the battery management system through the temperature acquisition line 42, and the battery management system monitors and manages the battery. Traditional CCS components generally use voltage acquisition cables and temperature acquisition cables to connect the bus and the battery management system, which has the problem of messy cables. The present application solves the problem of messy cables by directly setting the voltage acquisition line 41 and the temperature acquisition line 42 on the flexible circuit board 100.
[0055] In one embodiment, in combination Figure 1 and Figure 4 As shown, the flexible circuit board 100 includes a first conductive layer 10, an insulating layer 30 and a second conductive layer 40 stacked in sequence, a voltage collection line 41 and a temperature collection line 42 are both arranged in the second conductive layer 40, and the flexible circuit board 100 is provided with a conductive hole 50, and the two ends of the conductive hole 50 are electrically connected to the first conductive layer 10 and the voltage collection line 41 respectively.
[0056] By setting the voltage collection line 41 and the temperature collection line 42 in the second conductive layer 40 and arranging them in layers with the first conductive layer 10, on the one hand, the first conductive layer 10 can be fully utilized to set the first positive electrode welding point 111, the first negative electrode welding point 121, the second positive electrode welding point 131 and the second negative electrode welding point 132 to meet the needs of more batteries being welded on the first conductive layer 10, and on the other hand, the voltage collection line 41 and the temperature collection line 42 can be avoided from being routed in a disorderly manner, thereby reducing the difficulty of wiring. The first conductive layer 10 and the second conductive layer 40 are separated by an insulating layer 30, which can avoid the first conductive layer 10 and the second conductive layer 40 from contacting and short-circuiting, thereby ensuring that the battery, the voltage collection line 41 and the temperature collection line 42 each work normally. In order to realize the electrical connection between the first conductive layer 10 and the voltage collection line 41, it is only necessary to process the conductive hole 50 on the flexible circuit board 100, so that the two ends of the conductive hole 50 are electrically connected to the first conductive layer 10 and the voltage collection line 41 respectively, and the voltage collection line 41 can be electrically connected to the first conductive layer 10 through the conductive hole 50, and the manufacturing process is simple. It should be noted that the temperature sensing element 300 connected to the temperature collection line 42 reflects the temperature change of the battery by directly detecting the temperature change of the insulating layer 30 . The temperature sensing element 300 may be specifically an NTC, ie, a thermistor.
[0057] Specifically, the first parallel block 11, the second parallel block 12 and the series-parallel block 13 are formed by etching the first conductive layer 10, and the voltage acquisition line 41 and the temperature acquisition line 42 are formed by etching the second conductive layer 40. When etching the first conductive layer 10, a boundary line is etched between the first parallel block 11 and the adjacent series-parallel block 13 to expose the insulating layer 30, so that the first parallel block 11 and the series-parallel block 13 are completely separated and do not contact each other for electrical conduction, a boundary line is etched between the second parallel block 12 and the adjacent series-parallel block 13 to expose the insulating layer 30, so that the second parallel block 12 and the series-parallel block 13 are completely separated and do not contact each other for electrical conduction, and a boundary line is etched between two adjacent series-parallel blocks 13 to expose the insulating layer 30, so that the two adjacent series-parallel blocks 13 are completely separated and do not contact each other for electrical conduction. Of course, in some other embodiments, the first parallel block 11, the second parallel block 12 and the series-parallel block 13 can also be formed by depositing conductive materials on the insulating layer 30, and the voltage collection line 41 and the temperature collection line 42 can also be formed by depositing conductive materials on the insulating layer 30. At this time, the first conductive layer 10 and the second conductive layer 40 should be understood as spaces located on both sides of the insulating layer 30 respectively.
[0058] Specifically, the insulating layer 30 includes a first substrate layer 31, a second substrate layer 32, and an adhesive layer 33 disposed between the first substrate layer 31 and the second substrate layer 32. The first conductive layer 10 is disposed on the side of the first substrate layer 31 facing away from the adhesive layer 33, and the second conductive layer 40 is disposed on the side of the second substrate layer 32 facing away from the adhesive layer 33. The first conductive layer 10 and the first substrate layer 31 form a first sheet material, and the second conductive layer 40 and the second substrate layer 32 form a second sheet material. The first sheet material and the second sheet material are bonded by the adhesive layer 33 to obtain the flexible circuit board 100. The first substrate layer 31 and the second substrate layer 32 can be made of polyimide, that is, PI material, the first conductive layer 10 and the second conductive layer 40 can both be copper foil layers, aluminum layers or other conductive material layers, the thickness of the first conductive layer 10 can be 0.5 mm, and the thickness of the second conductive layer 40 can be 0.03 mm.
[0059] In one embodiment, the flexible circuit board 100 is provided with conductive holes 50 corresponding to the first parallel block 11, the series-parallel block 13, and the second parallel block 12. The number of voltage collection lines 41 is consistent with the number of conductive holes 50. One end of the plurality of voltage collection lines 41 is electrically connected to the plurality of conductive holes 50 respectively to respectively collect the voltages at the first parallel block 11, each series-parallel block 13, and the second parallel block 12. The other ends of the plurality of voltage collection lines 41 converge at one place to facilitate collective connection to the battery management system. The plurality of voltage collection lines 41 are all arranged at the edge of the second conductive layer 40, as far away as possible from the area in the middle of the first conductive layer 10 for welding batteries, so as to reduce the impact on the collected voltage signal.
[0060] In one embodiment, there are multiple temperature collection lines 42, and the multiple temperature collection lines 42 are arranged on the four edges of the second conductive layer 40, as far away as possible from the area in the middle of the first conductive layer 10 used for welding batteries to reduce the impact on the collected temperature signal. The multiple temperature collection lines 42 are used to connect one end of the temperature sensing element 300 and are distributed at intervals along the circumference of the second conductive layer 40 to achieve temperature collection at multiple locations. The ends of the multiple temperature collection lines 42 away from the temperature sensing element 300 and the ends of the multiple voltage collection lines 41 away from the conductive holes 50 converge at one place to facilitate collective connection to the battery management system.
[0061] In one embodiment, in combination Figure 4 , Figure 5 and Figure 6 As shown, the second conductive layer 40 is also provided with a first solder pad 43, a second solder pad 44 and a third solder pad 45. The first solder pad 43 is located at the end of the voltage collection line 41 away from the conductive hole 50, and the second solder pad 44 and the third solder pad 45 are respectively located at the two ends of the temperature collection line 42; the flexible circuit board 100 also includes a second covering layer 60, and the second covering layer 60 covers the second conductive layer 40. The second covering layer 60 is provided with through holes at positions corresponding to the first solder pad 43, the second solder pad 44 and the third solder pad 45.
[0062] The first pad 43 and the second pad 44 are both used for welding the connector, which is used to connect the battery management system, and the third pad 45 is used for welding the temperature sensing element. By making the second cover layer 60 cover the voltage acquisition line 41 and the temperature acquisition line 42 of the second conductive layer 40, the voltage acquisition line 41 and the temperature acquisition line 42 can be prevented from being exposed, thereby playing a protective role, and by opening a through hole in the second cover layer 60 to expose the first pad 43, the second pad 44 and the third pad 45, the welding requirements are met.
[0063] Specifically, combined Figure 1 and Figure 5As shown, the second conductive layer 40 is also provided with a fourth pad 46, and the fourth pad 46 is located at one end of the voltage collection line 41 away from the first pad 43, and the conductive hole 50 extends from the fourth pad 46 to the first conductive layer 10. When making the conductive hole 50, firstly, a blind hole is opened in the middle of the fourth pad 46, so that the blind hole extends to the first conductive layer 10, and then solder paste is applied on the fourth pad 46, so that the solder paste flows into the blind hole to form the conductive hole 50, and the second covering layer 60 is also provided with a through hole at the position corresponding to the fourth pad 46, so as to facilitate the subsequent opening of the blind hole and the application of solder paste. Of course, the conductive hole 50 can also be made by other methods, such as electroplating a conductive column in the blind hole.
[0064] Combination Figure 1 , Figure 7 and Figure 8 As shown, the present application also provides a battery pack, including multiple batteries 200 and the above-mentioned flexible circuit board 100, the first positive electrode welding point 111 is welded to the positive electrode 201 of the battery 200, the first negative electrode welding point 121 is welded to the negative electrode 202 of the battery 200, the second positive electrode welding point 131 is welded to the positive electrode 201 of the battery 200, and the second negative electrode welding point 132 is welded to the negative electrode 202 of the battery 200.
[0065] N first positive electrode welding points 111 and N second negative electrode welding points 132 are grouped in one-to-one correspondence, and the grouped first positive electrode welding points 111 and second negative electrode welding points 132 are respectively welded to the positive electrode 201 and negative electrode 202 of the same battery 200, and N first negative electrode welding points 121 and N second positive electrode welding points 131 are grouped in one-to-one correspondence, and the grouped first negative electrode welding points 121 and second positive electrode welding points 131 are respectively welded to the negative electrode 202 and positive electrode 201 of the same battery 200, so that multiple batteries can be connected in series and parallel, and the output current and voltage can be increased at the same time. The present application directly welds multiple batteries on the flexible circuit board 100 to realize the series and parallel connection of multiple batteries 200, without the need to use a bus bar and a plastic bracket for fixing the bus bar, thereby achieving the purpose of simplifying the structure, simplifying the process flow and reducing the production cost.
[0066] Furthermore, combined with Figure 1 , Figure 4 and Figure 7As shown, the battery pack also includes a temperature sensing element 300 and a battery management system (not shown), and the flexible circuit board 100 is provided with a voltage acquisition line 41 and a temperature acquisition line 42, one end of the voltage acquisition line 41 is electrically connected to the first conductive layer 10, one end of the temperature acquisition line 42 is electrically connected to the temperature sensing element 300, and the other end of the voltage acquisition line 41 and the other end of the temperature acquisition line 42 are both electrically connected to the battery management system. When working, the voltage acquisition line 41 can collect the voltage signal of the battery welded on the first conductive layer 10, and transmit the collected voltage signal to the battery management system, and the battery management system monitors and manages the battery, and the temperature sensing element 300 can collect the temperature signal of the battery welded on the first conductive layer 10, and the collected temperature signal is transmitted to the battery management system through the temperature acquisition line 42, and the battery management system monitors and manages the battery.
[0067] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A flexible circuit board, characterized in that: The invention comprises a first conductive layer, wherein the first conductive layer comprises a first parallel plate, a second parallel plate and a series-parallel plate which are arranged at intervals, wherein the first parallel plate is provided with N electrically connected first positive electrode welding points, the second parallel plate is provided with N electrically connected first negative electrode welding points, the series-parallel plate is provided with N electrically connected second positive electrode welding points and N electrically connected second negative electrode welding points, the N second positive electrode welding points are electrically connected to the N second negative electrode welding points respectively, the N first positive electrode welding points correspond to the N second negative electrode welding points one by one, and the N first negative electrode welding points correspond to the N second positive electrode welding points one by one.
2. The flexible circuit board according to claim 1, characterized in that: There are multiple series-parallel plates, and the multiple series-parallel plates are arranged at intervals. The second negative electrode welding point corresponding to the first positive electrode welding point and the second positive electrode welding point corresponding to the first negative electrode welding point are respectively located in two of the series-parallel plates; for two adjacent series-parallel plates, the N second positive electrode welding points of one of the series-parallel plates correspond one-to-one to the N second negative electrode welding points of the other series-parallel plate.
3. The flexible circuit board according to claim 2, characterized in that: The first parallel plate and the second parallel plate are sequentially arranged along a first direction, and the plurality of series-parallel plates are arranged between the first parallel plate and the second parallel plate, and are spaced apart along the first direction; N first positive electrode welding points are arranged at intervals along the second direction, N first negative electrode welding points are arranged at intervals along the second direction, N second positive electrode welding points located in the same series-parallel block are arranged at intervals along the second direction, and N second negative electrode welding points located in the same series-parallel block are arranged at intervals along the second direction, and the second direction is perpendicular to the first direction; The N first positive electrode welding points correspond one-to-one with the N second negative electrode welding points of the adjacent series-parallel plates in the first direction, and the N first negative electrode welding points correspond one-to-one with the N second positive electrode welding points of the adjacent series-parallel plates in the first direction. For two adjacent series-parallel plates, the N second positive electrode welding points of one of the series-parallel plates correspond one-to-one with the N second negative electrode welding points of the other series-parallel plate in the first direction.
4. The flexible circuit board according to claim 1, characterized in that: The flexible circuit board also includes a first covering layer, which covers the first conductive layer, and the first covering layer is provided with through holes corresponding to the first positive electrode welding point, the first negative electrode welding point, the second positive electrode welding point, and the second negative electrode welding point.
5. The flexible circuit board according to claim 4, characterized in that: The first parallel plate is also provided with a positive electrode tab, which is electrically connected to each of the first positive electrode welding points. The second parallel plate is also provided with a negative electrode tab, which is electrically connected to each of the first negative electrode welding points. The first covering layer is provided with through holes at positions corresponding to the positive electrode tab and the negative electrode tab.
6. The flexible circuit board according to any one of claims 1 to 5, characterized in that: The flexible circuit board is also provided with a voltage collection line and a temperature collection line, and the voltage collection line is electrically connected to the first conductive layer.
7. The flexible circuit board according to claim 6, characterized in that: The flexible circuit board includes the first conductive layer, the insulating layer, and the second conductive layer stacked in sequence, the voltage collection line and the temperature collection line are both arranged in the second conductive layer, and the flexible circuit board is provided with a conductive hole, and the two ends of the conductive hole are respectively electrically connected to the first conductive layer and the voltage collection line.
8. The flexible circuit board according to claim 7, characterized in that: The second conductive layer is further provided with a first pad, a second pad and a third pad, the first pad is located at an end of the voltage collection line away from the conductive hole, and the second pad and the third pad are respectively located at two ends of the temperature collection line; The flexible circuit board further includes a second covering layer, the second covering layer covers the second conductive layer, and the second covering layer is provided with through holes at positions corresponding to the first pad, the second pad, and the third pad.
9. A battery pack, characterized in that: Comprising multiple batteries and a flexible circuit board as described in any one of claims 1-8, the first positive electrode welding point is welded to the positive electrode of the battery, the first negative electrode welding point is welded to the negative electrode of the battery, the second positive electrode welding point is welded to the positive electrode of the battery, and the second negative electrode welding point is welded to the negative electrode of the battery.
10. The battery pack according to claim 9, characterized in that: The battery pack also includes a temperature sensing element and a battery management system. The flexible circuit board is provided with a voltage collection line and a temperature collection line. One end of the voltage collection line is electrically connected to the first conductive layer, one end of the temperature collection line is electrically connected to the temperature sensing element, and the other end of the voltage collection line and the other end of the temperature collection line are both electrically connected to the battery management system.