Signal acquisition circuit board, battery module and electrical equipment

Abstract

The utility model relates to a signal acquisition circuit board, a battery module and electrical equipment. The signal acquisition circuit board comprises a circuit pattern, the circuit pattern comprises a first connection area, a first extension line, a thinnest part, a second extension line and a second connection area which are connected in sequence, the first connection area and the second connection area are arranged along a first direction, and both the first connection area and the second connection area deviate from the thinnest part along a second direction, the first connecting area and the second connecting area are located on the same side of the thinnest part in the second direction, and the second direction intersects with the first direction. The first conducting strip is connected to the first connecting area; and a second conductive sheet connected to the second connection region. The signal acquisition circuit board is reliable in performance.

Description

Technical Field

[0001] The present disclosure relates to the technical field of circuit boards, and particularly to a signal acquisition circuit board, a battery module, and an electrical device. Background Art

[0002] The automotive industry is rapidly transforming towards electrification, intelligence, and lightweighting, and the new energy vehicle market is developing rapidly. As one of the core components of new energy vehicles, the quality of the battery pack determines the performance of the entire vehicle. A new energy battery pack generally includes multiple battery modules, and each battery module is configured with a set of integrated busbars (Cells Contact System, CCS). The integrated busbar is composed of a signal acquisition wire harness, a return busbar, and an isolation plate. Among them, the sampling wire harness is responsible for collecting information such as the working voltage and temperature of the battery cells.

[0003] In the early CCS solutions, electronic wire harnesses were used for signal acquisition. This solution consists of electronic wire harnesses and peripheral plastic plates, etc. Each electronic wire is connected to an electrode of a battery cell. When there are a lot of power battery signals, a lot of such electronic wires are required, which will occupy a large amount of space, be relatively bulky, and have a low degree of automation.

[0004] During the charging and discharging process of the battery cells, there will be dimensional changes. The sampling wire harness in the CCS of the blade battery is often repeatedly pulled during the charging and discharging process of the battery cells. If the sampling wire harness breaks, the voltage and temperature of the entire battery pack cannot be collected, resulting in the battery cells of the battery pack operating in an out-of-control state, with uncertainties or abnormal alarms in the use of the battery, and there are safety risks. Summary of the Utility Model

[0005] The embodiments of the present disclosure provide a signal acquisition circuit board, which includes: a circuit pattern, the circuit pattern includes a first connection area, a first extension line, a thinnest part, a second extension line, and a second connection area connected in sequence. The first connection area and the second connection area are arranged along a first direction. Both the first connection area and the second connection area deviate from the thinnest part along a second direction. The first connection area and the second connection area are located on the same side of the thinnest part along the second direction. The second direction intersects the first direction; a first conductive sheet connected to the first connection area; and a second conductive sheet connected to the second connection area.

[0006] By setting the positions of the first connection area and the second connection area to deviate from the thinnest part, when the first connection area and the second connection area are subjected to external forces, the thinnest part can be well protected to avoid being damaged by the force. The signal acquisition circuit board of the embodiments of the present disclosure has reliable performance.

[0007] In some embodiments, the second conductive sheet and the first conductive sheet extend towards opposite sides along the second direction; the first conductive sheet faces the thinnest part relative to the first connection area, and the second conductive sheet faces away from the thinnest part relative to the second connection area; the first extension line is inclined 20° to 70° relative to the first direction.

[0008] With such a setting, the signal acquisition circuit board has a compact structure; the circuits in the signal acquisition circuit board are smooth, and the circuit stress can be well distributed on all the circuits, with reliable performance; in addition, it is beneficial to realize production by using the die-cutting process.

[0009] Exemplarily, the first extension line gradually becomes wider along the direction away from the thinnest part, and the second extension line gradually becomes wider along the direction away from the thinnest part.

[0010] With such a setting, by thickening the remaining circuits, it is also beneficial to improve the stress resistance ability of the circuits.

[0011] In some embodiments, in the extension plane defined by the circuit pattern, the thinnest part has an extension path, and the size range of the thinnest part at each position along the vertical direction of the extension path is 0.08 mm to 0.5 mm.

[0012] With such a setting, the function of the thinnest part can be ensured.

[0013] In some embodiments, the thinnest part is a wavy structure, and the curvature radius range of any wave bending part of the thinnest part is 0.5 mm to 3 mm.

[0014] With such a setting, the function of the thinnest part can be ensured, and it is beneficial to improve the structural reliability of the thinnest part;

[0015] Exemplarily, two arc-shaped transition parts located on both sides of the thinnest part are formed at one end of the first extension line connected to the thinnest part, and two other arc-shaped transition parts located on both sides of the thinnest part are formed at one end of the second extension line connected to the thinnest part, and the curvature radius of each arc-shaped transition part is 1 to 5 times the line width at the corresponding position.

[0016] With such a setting, by making an arc-shaped transition design for the inflection points of the circuits, the stress on the circuits can be dispersed, and the stress concentration phenomenon of the circuits can be avoided.

[0017] In some embodiments, the signal acquisition circuit board further includes a protective layer covering the circuit pattern.

[0018] With such a setting, the structural stability of the circuit pattern is better, and both the front and back sides of the first extension line, the second extension line, the thinnest part, etc. can be insulated from the outside.

[0019] In some embodiments, the protective layer is provided with at least one hole between the first connection area, the second connection area and the thinnest part.

[0020] By setting up in this way, the force transmission path from the connection area to the thinnest part can be cut off by opening the hole, thereby fully preventing the thinnest part from being affected by the stress caused by the external force in the first connection area and the second connection area.

[0021] In some embodiments, a plurality of circuit patterns are arranged along a first direction, and the protection layer is provided with at least one hole between two adjacent circuit patterns.

[0022] With such arrangement, the signal acquisition circuit board is suitable for signal acquisition of multiple cells, and the influence between circuit patterns is small. The signal acquisition circuit board can be manufactured by die cutting process, which has simple process, low cost, fast line body replication and no pollution.

[0023] In some embodiments, the thinnest part and the second connection area are arranged opposite to each other along the second direction; the signal acquisition circuit board also includes a protective wide line, which is located between the thinnest part and the second connection area, and the protective wide line is spaced apart from the circuit pattern, and is closer to the thinnest part than the second connection area.

[0024] With such a configuration, the protective width line can mitigate the influence of the force transmitted from the first connection area and the second connection area on the thinnest part.

[0025] Exemplarily, the protection width line has a protection dimension D along the second direction at any point along the first direction, and the thinnest part has a line width dimension d in the vertical direction of the extension path of the thinnest part, wherein 5d≤D≤10d.

[0026] With this arrangement, the protective width line is stable when subjected to stress, thereby improving the stability of the thinnest part nearby.

[0027] The disclosed embodiment provides a battery module, which includes: at least two battery cells arranged along a first direction; and the aforementioned signal acquisition circuit board, wherein the first conductive sheet and the second conductive sheet are electrically connected to the corresponding battery cells respectively.

[0028] The battery module of the disclosed embodiment can reliably collect signals, is controllable in use, and has good safety.

[0029] An embodiment of the present disclosure provides an electrical device, which includes the aforementioned battery module.

[0030] The electrical equipment of the disclosed embodiment can reliably collect signals, is controllable in use, and has good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a battery module according to an embodiment of the present disclosure;

[0032] Figure 2 for Figure 1 A schematic cross-sectional view at AA in the middle;

[0033] Figure 3 Structural schematic diagram of the metal layer in the embodiments of the present disclosure;

[0034] Figure 4 Schematic structural diagram of the metal layer in the embodiments of the present disclosure;

[0035] Figure 5 Structural schematic diagram of the signal acquisition circuit board in the embodiments of the present disclosure;

[0036] Figure 6 Schematic structural block diagram of the electrical device in the embodiments of the present disclosure.

[0037] Explanation of reference numerals: 100, signal acquisition circuit board; 1, circuit pattern; 101, first connection area; 102, first extension line; 103, finest part; 104, second extension line; 105, second connection area; 106, first arc transition part; 107, second arc transition part; 108, third arc transition part; 109, fourth arc transition part; 110, fifth arc transition part; 111, sixth arc transition part; 112, seventh arc transition part; 113, eighth arc transition part; 2, conductive sheet; 21, first conductive sheet; 211, first connection end; 212, first contact end; 22, second conductive sheet; 221, second connection end; 222, second contact end; 3, protective layer; 31, first protective layer; 32, second protective layer; 301, first hole; 302, second hole; 303, third hole; 304, fourth hole; 305, first connection point; 306, second connection point; 307, third connection point; 4, protective wide line; 200, battery module; 201, battery cell; 300, battery management system; 400, power consumption module; 500, electrical device. Detailed implementation manners

[0038] In order to make the above-mentioned objects, features and advantages of the embodiments of the present disclosure more obvious and understandable, the following will describe in detail the specific implementation manners of the embodiments of the present disclosure with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the embodiments of the present disclosure. However, the embodiments of the present disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the embodiments of the present disclosure. Therefore, the embodiments of the present disclosure are not limited by the specific embodiments disclosed below.

[0039] In the description of the embodiments of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present disclosure.

[0040] In the embodiments of the present disclosure, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0041] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. Exemplarily, the first conductive sheet may also be referred to as the second conductive sheet, and the second conductive sheet may also be referred to as the first conductive sheet. In the description of the embodiments of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the embodiments of the present disclosure, unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a flexible connection or a rigid connection along at least one direction; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, or directly connected while there is an intermediate medium, or it may also be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. The terms "mounted", "arranged" and "fixed" can be understood in a broad sense as connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0043] As used herein, the terms "layer" and "region" refer to a portion of a material that includes a region having a certain thickness. The layer can extend horizontally, vertically, and / or along a tapered surface. The layer can be a region of a uniform or non-uniform continuous structure, and the thickness perpendicular to the extension direction may not be greater than the thickness of the continuous structure. The layer can include multiple layers, which can be multiple stacked layers or multiple discretely extending layers. The shapes of various regions and layers in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may actually deviate due to manufacturing tolerances or technical limitations, and the design can be adjusted according to actual needs.

[0044] Reference Figure 1 , Figure 1 shows a battery module according to an embodiment of the present disclosure. In an exemplary embodiment, the battery module 200 includes a battery cell 201 and a signal acquisition circuit board 100, and the signal acquisition circuit board 100 is electrically connected to the battery cell 201.

[0045] Combined Figure 5 As shown, the signal acquisition circuit board 100 provided by the embodiment of the present disclosure includes a circuit pattern 1 and conductive sheets 2. The number of conductive sheets 2 can be at least two. Each circuit pattern 1 can be electrically connected to two conductive sheets, and these two conductive sheets 2 can be a first conductive sheet 21 and a second conductive sheet 22.

[0046] As Figure 1 and Figure 3 shown, the circuit pattern 1 includes a first connection area 101, a first extension line 102, a thinnest part 103, a second extension line 104, and a second connection area 105 that are connected in sequence. The extension plane of the circuit pattern 1 can be parallel to the XY plane; its thickness in the Z-axis direction is relatively thin. The circuit pattern 1 can be simply referred to as a circuit, and the circuit pattern 1 can continuously extend from the first connection area 101 to the second connection area 105. In some other embodiments, the circuit pattern 1 can have a certain curvature.

[0047] Within the extension plane of the circuit pattern 1, the extension paths of each part of the circuit pattern 1 can ensure the transmission of current. Exemplarily, the extension path of the thinnest part 103 can be referred to as the first extension path, the first extension line 102 can have a second extension path, and the second extension line 104 can have a third extension path. The dimension in the vertical direction along the extension path at each position of the circuit pattern 1 can be referred to as the line width. The thinnest part 103 is the part with the smallest line width in the circuit pattern 1. The line widths at each part of the first connection area 101, the first extension line 102, the second extension line 104, and the second connection area 105 are all greater than the line width of the thinnest part 103.

[0048] The line pattern 1 can be substantially of equal thickness along the Z-axis direction, or there can be certain thickness differences. In the current transmission path, the thinnest part 103 can have the smallest cross-sectional area. The resistance at the thinnest part 103 is large. When the current in the line pattern 1 is too large, it can be melted at the thinnest part 103, and the thinnest part 103 can serve as a fuse in the line pattern 1.

[0049] The first connection area 101 and the second connection area 105 are arranged along a first direction, and this first direction can be parallel to the X-axis direction. In the XY plane, there can be a second direction, and the second direction intersects the first direction. Exemplarily, the second direction is perpendicular to the first direction. For example, the second direction is parallel to the Y-axis direction. The first connection area 101 and the second connection area 105 can be substantially aligned, or there can be a certain misalignment. Both the first connection area 101 and the second connection area 105 deviate from the thinnest part 103 along the second direction, and the first connection area 101 and the second connection area 105 are on the same side of the thinnest part 103 along the second direction. For example Figure 1 in, it is located on the lower side of the thinnest part 103 along the Y-axis direction. The thinnest part 103 has a gap from the first connection area 101 along the Y-axis direction, and also has a gap from the second connection area 105. The first extension line 102 and the second extension line 104 can be designed according to requirements.

[0050] The conductive sheet 2 is connected to the line pattern 1. Exemplarily, the conductive sheet 2 includes a connection end and a contact end. The connection end is connected to the line pattern 1, and the contact end is used to connect to the battery cell 201. The conductive sheet 2 is used to electrically connect the battery cell 201 and the line pattern 1. Exemplarily, the connection end of the first conductive sheet 21, i.e., the first connection end 211, is connected to the first connection area 101. The connection end of the second conductive sheet 22, i.e., the second connection end 221, is connected to the second connection area 105. The contact end of the first conductive sheet 21, i.e., the first contact end 212, protrudes from the line pattern 1, for example, protrudes from the first connection area 101 along the Y-axis direction. The contact end of the second conductive sheet 22, i.e., the second contact end 222, protrudes from the line pattern 1, for example, protrudes from the second connection area 105 along the Y-axis direction. In the signal acquisition circuit board 100, the line pattern 1 and the conductive sheet 2 can be placed on the battery cell 201 along the Z-axis direction, and the conductive sheet 2 is electrically connected to the battery cell 201.

[0051] During the operation of the battery cell 201, the signal acquisition circuit board 100 can be used to acquire signals of the battery cell 201. The battery cell 201 applies a force to the conductive sheet 2 and then to the circuit pattern 1, for example, due to the possible expansion of the battery cell 201 during charging and discharging, environmental durability impact after long-term use, and changes in the relative positions of multiple battery cells 201. The first conductive sheet 21 and the second conductive sheet 22 can be pulled to both sides along the X-axis direction, and then the first connection area 101 and the second connection area 105 may be pulled apart to both sides. During this process, stress areas are formed near the first connection area 101 and the second connection area 105, and the thinnest part 103 can be regarded as a non-force-bearing area.

[0052] By setting the positions of the first connection area 101 and the second connection area 105 to deviate from the thinnest part 103 and the first connection area 101 and the second connection area 105 are on the same side of the thinnest part 103, when the first connection area 101 and the second connection area 105 are subjected to an external force, the force-bearing area deviates from the thinnest part 103, and the thinnest part 103 can be well protected to avoid being damaged by force. The signal acquisition circuit board 100 of the embodiment of the present disclosure has reliable performance.

[0053] In some embodiments, the second conductive sheet 22 and the first conductive sheet 21 extend towards opposite sides along the second direction; the contact ends of the second conductive sheet 22 and the contact ends of the first conductive sheet 21 are located on both sides of the whole of the first connection area 101 and the second connection area 105. As Figure 1 shown, the first contact end 212 is located on the upper side of the first connection area 101 and the second connection area 105 in the Y-axis direction in the figure, and the second contact end 222 is located on the lower side of the first connection area 101 and the second connection area 105 in the Y-axis direction in the figure. Exemplarily, the thinnest part 103 and the contact end of the first conductive sheet 21 are on the same side of the first connection area 101 and the second connection area 105. In other words, along the second direction, the first conductive sheet 21 faces the thinnest part 103 relative to the first connection area 101, and the second conductive sheet 22 faces away from the thinnest part 103 relative to the second connection area 105. The signal acquisition circuit board 100 has a compact structure.

[0054] Exemplarily, the position of the thinnest part 103 along the X-axis direction is substantially the same as the position of the second connection area 105. The first extension line 102 is inclined 20° to 70° relative to the arrangement direction, such as 30°, 45° or 60°. Exemplarily, the second extension line 104 is substantially parallel to the Y-axis direction. The circuit in the signal acquisition circuit board 100 is smooth, and the circuit stress can be well distributed on all the circuits, and the performance is reliable; in addition, it is beneficial to realize production by using the die-cutting process.

[0055] In some other embodiments, the contact ends of the second conductive sheet 22 and the contact ends of the first conductive sheet 21 are located on the same side of the whole of the first connection area 101 and the second connection area 105 in the Y-axis direction.

[0056] In some embodiments, the vertical dimension range of each position of the thinnest part 103 along the extension path is from 0.08 mm to 0.5 mm, such as 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm or 0.4 mm, which can ensure the realization of the function of the thinnest part 103.

[0057] Exemplarily, the first extension line 102 gradually becomes wider in the direction away from the thinnest part 103, and the second extension line 104 gradually becomes wider in the direction away from the thinnest part 103. By thickening the part outside the thinnest part 103, it is also beneficial to improve the stress resistance ability of the circuit pattern 1. The extension path of the first extension line 102 can be substantially a straight line, or the extension path of the first extension line 102 can have a certain curvature. The extension path of the second extension line 104 can be substantially a straight line or can have a certain curvature.

[0058] In some embodiments, the thinnest part 103 is a wavy structure. Each wavy bend of the thinnest part 103 can have the same size or can be different. Exemplarily, the curvature radius range of any wavy bend of the thinnest part 103 is from 0.5 mm to 3 mm, such as the curvature radius of the wavy bend is 0.7 mm, 1.3 mm, 1.9 mm or 2.5 mm, which can ensure the realization of the function of the thinnest part 103 and is beneficial to improving the structural reliability of the thinnest part 103. This curvature radius can be the inner circle measured at the wavy bend. The curvature radius of the wavy bend of the thinnest part 103 is greater than the line width of the thinnest part 103, which is also beneficial to reducing the influence of stress on the thinnest part 103 and avoiding the thinnest part 103 from being broken.

[0059] Reference Figure 4 , exemplarily, the line width d of each position of the thinnest part 103 is 0.1 mm. Each position of the thinnest part 103 can be basically of equal width or can have a certain change, such as the middle section position of the thinnest part 103 is slightly narrower and the two ends are slightly wider. It can be understood that along the Y-axis direction, the Y-direction dimension e of different positions of the thinnest part 103 may be greater than the line width d. For the wavy structure or other non-linear structure of the thinnest part 103, it can have a structural width E along the Y-axis direction.

[0060] Exemplarily, at one end of the first extension line 102 connected to the finest part 103, two arc-shaped transition parts are formed on both sides of the finest part 103; at one end of the second extension line connected to the finest part, two other arc-shaped transition parts are formed on both sides of the finest part. The curvature radius of each of the foregoing arc-shaped transition parts is 1 to 5 times the line width at the corresponding position. The curvature radius of the arc-shaped transition parts at each of the two ends of the first extension line 102 and the two ends of the second extension line 104 is 1 to 5 times the line width at the corresponding position. By making an arc-shaped transition design for the inflection points of the circuit pattern 1, the force on the circuit pattern 1 can be dispersed, and the stress concentration phenomenon of the circuit pattern 1 can be avoided. The line widths on both sides of the arc-shaped transition part along the extension path are different. Exemplarily, its curvature radius can be 1 to 5 times the line width of the finest part 103. In some other embodiments, the arc-shaped transition part can be a gradually changing arc. Exemplarily, the line width of the first extension line 102 can be 0.1 mm to 3 mm.

[0061] Combined with Figure 3 As shown, a first arc-shaped transition part 106 and a second arc-shaped transition part 107 are formed between the first extension line 102 and the first connection area 101. In some other embodiments, the second arc-shaped transition part 107 can be regarded as the rounded corner of the first connection area 101 itself. At one end of the first extension line 102 connected to the finest part 103, a third arc-shaped transition part 108 and a fourth arc-shaped transition part 109 are formed. In some other embodiments, at least one of these two arc-shaped transition parts can be regarded as a part of the wave structure of the finest part 103. Exemplarily, the curvature radius of the first arc-shaped transition part 106 is 3 mm, and the curvature radius of the third arc-shaped transition part 108 is 1 mm.

[0062] At one end of the second extension line 104 connected to the finest part 103, a fifth arc-shaped transition part 110 and a sixth arc-shaped transition part 111 are formed. In some other embodiments, at least one of these two arc-shaped transition parts can be regarded as a part of the wave structure of the finest part 103. A seventh arc-shaped transition part 112 and an eighth arc-shaped transition part 113 are formed between the second extension line 104 and the second connection area 105. In some other embodiments, the seventh arc-shaped transition part 112 can be regarded as a part of the second connection area 105 itself. Exemplarily, the curvature radius of the eighth arc-shaped transition part 113 is 2 mm.

[0063] The first connection area 101 and the second connection area 105 can each extend into a rectangle or other shapes and have a relatively large area. Exemplarily, the first connection area 101 and the second connection area 105 each form a rounded corner, and the radius of the rounded corner can be 1 mm to 3 mm.

[0064] Combined with Figure 2As shown, in some embodiments, the signal acquisition circuit board 100 further includes a protective layer 3 covering the circuit pattern 1, which has better structural stability, and both the positive and negative sides of the first extension line 102, the second extension line 104, and the finest part 103 along the Z-axis direction can be insulated from the outside. The protective layer 3 may include a first protective layer 31 and a second protective layer 32.

[0065] As Figure 1 and Figure 2 shown, in some embodiments, the protective layer 3 is provided with at least one hole between the first connection area 101, the second connection area 105, and the finest part 103. By opening the hole, the force transmission path from the connection area to the finest part 103 can be interrupted, fully avoiding the stress influence on the finest part 103 caused by the first connection area 101 and the second connection area 105 due to external forces. Exemplarily, the first hole 301 and the second hole 302 are located between the first connection area 101 and the second connection area 105. The third hole 303 is located between the second connection area 105 and the finest part 103 and can extend to between the second connection area 105 and the first extension line 102; along the X-axis direction, the third hole 303 is also located between the first extension line 102 and the second extension line 104.

[0066] Exemplarily, the signal acquisition circuit board 100 may include micro-connection points. The micro-connection points can be part of the protective layer 3. The micro-connection points can be located between the first connection area 101 and the second connection area 105. When the first connection area 101 and the second connection area 105 are under greater force, the micro-connection points can be torn off to change or interrupt the force transmission path and protect the integrity of the circuit pattern 1 without an open circuit.

[0067] The micro-connection points can be the parts remaining between the holes. The first connection point 305 can be located at the boundary of the first hole 301. The second connection point 306 is located between the first hole 301 and the second hole 302. The third connection point 307 is located between the second hole 302 and the third hole 303.

[0068] Combined Figure 2 and Figure 3 , in some embodiments, the finest part 103 and the second connection area 105 are oppositely arranged along the Y-axis direction. The signal acquisition circuit board 100 further includes a protective wide line 4, and the protective wide line 4 is located between the finest part 103 and the second connection area 105, and the protective wide line 4 can be used to reduce the influence of the force transmitted at the first connection area 101 and the second connection area 105 on the finest part 103.

[0069] Exemplarily, along the X-axis direction, the length of the protective wide line 4 can be greater than the length of the finest part 103. The protective wide line 4 may include a part extending along the first extension line 102, which helps to reduce the force transmitted from the first extension line 102 to the finest part 103.

[0070] The guard wide line 4 has a gap with the line pattern 1 and may not be used for conduction. The guard wide line 4 is closer to the finest part 103 than the second connection area 105, which is beneficial to ensuring that the non-stressed area is isolated from the stressed area. In some embodiments, the guard wide line 4 is located between the finest part 103 and the third hole 303, which is beneficial to protecting the finest part 103.

[0071] Exemplarily, the guard wide line 4 extends substantially along the X-axis direction, and the dimension D of the guard wide line 4 in the Y-axis direction is 5 to 10 times the line width of the finest part 103, which is beneficial to ensuring the strength of the guard wide line 4. Exemplarily, the line width D of the guard wide line 4 is greater than the structural width E of the wavy structure.

[0072] Combined with Figure 5 As shown, in some embodiments, a plurality of line patterns 1 are arranged in a first direction, and the protective layer 3 is provided with at least one hole, that is, at least one fourth hole 304, between two adjacent line patterns 1. The signal acquisition circuit board 100 is suitable for the signal acquisition of a plurality of battery cells 201, and the influence between the line patterns 1 is small.

[0073] Exemplarily, the signal acquisition circuit board 100 is formed by a die-cutting process. The line patterns 1 in the signal acquisition circuit board 100 are manufactured by a die-cutting process, with simple manufacturing processes, low cost, fast line replication, and no pollution.

[0074] In some other embodiments, the signal acquisition circuit board 100 can be formed by a printing process. Specifically, the line pattern 1 and the protective layer 3 form an excellent flexible printed circuit board based on the printing process, which has beneficial effects such as high reliability, high wiring density, light weight, thin thickness, good bending property, and small occupied space.

[0075] In some embodiments, the materials of the conductive sheet 2 and the line pattern 1 are metals respectively, and the two can be different. The conductive sheet 2 can be a nickel sheet. The material of the line pattern 1 can be copper. The conductive sheet 2 and the line pattern 1 can be welded. The conductive sheet 2 and the battery cell 201 can be welded.

[0076] The material of the protective layer 3 can be polyimide (PI). Exemplarily, the material of the protective layer 3 can include polyimide and adipic dihydrazide. In the protective layer 3, the thickness ranges of the first protective layer 31 and the second protective layer 32 can be 50 μm to 85 μm respectively. The thickness of the line pattern 1 can be 35 μm.

[0077] Combined with Figure 1 and Figure 6 As shown, the present disclosure embodiment provides a battery module 200, which includes: at least two battery cells 201 arranged in a first direction; and the aforementioned signal acquisition circuit board 100. The first conductive sheet 21 and the second conductive sheet 11 are electrically connected to the corresponding battery cells 201.

[0078] The battery module 200 according to the embodiments of the present disclosure can reliably collect signals, is controllable in use, and has good safety. The conductive sheet 2 realizes signal sampling, and the circuit pattern 1 is responsible for electrical transmission. The current can flow from the first conductive sheet 21, the circuit pattern 1 to the second conductive sheet 22, or vice versa. The overload protection of the circuit pattern 1 is borne by the finest part 103. Exemplarily, the protective layer 3 is used to achieve structural support and electrical protection for the circuit pattern 1.

[0079] Reference Figure 5 , the embodiments of the present disclosure provide an electrical device 500. The electrical device 500 includes the aforementioned battery module 200. The electrical device 500 can reliably collect signals, is controllable in use, and has good safety.

[0080] Exemplarily, the electrical device 500 includes a power consumption module 400. The electrical device 500 can be a new energy vehicle, and the power consumption module 400 can be an electric motor. The power consumption module 400 is electrically connected to the battery cell 201. The electrical device 500 can also be other power-consuming power devices or energy devices.

[0081] Exemplarily, the electrical device 500 includes a battery management system 300. The battery management system 300 can be electrically connected to the signal acquisition circuit board 100.

[0082] The technical features of the above-disclosed embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0083] In the above-disclosed embodiments, unless otherwise clearly specified and limited, the execution order of each step is not limited. For example, they can be executed in parallel or in different orders successively. The sub-steps of each step can also be executed alternately. Various forms of processes can be used, and steps can also be reordered, added, or deleted, as long as the desired results of the technical solutions provided by the embodiments of the present disclosure can be achieved. This is not limited herein.

[0084] The above-disclosed embodiments only represent several embodiments of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent protection scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the patent protection scope required by the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A signal acquisition circuit board, characterized in that: include: A line pattern, the line pattern comprising a first connection area, a first extension line, a thinnest part, a second extension line and a second connection area connected in sequence, the first connection area and the second connection area are arranged along a first direction, the first connection area and the second connection area are both deviated from the thinnest part along a second direction, the first connection area and the second connection area are located on the same side of the thinnest part along the second direction, and the second direction intersects the first direction; A first conductive sheet connected to the first connection area; as well as The second conductive sheet is connected to the second connection area.

2. The signal acquisition circuit board according to claim 1, characterized in that: The second conductive sheet and the first conductive sheet extend toward opposite sides along the second direction; the first conductive sheet faces the thinnest portion relative to the first connection area, and the second conductive sheet faces away from the thinnest portion relative to the second connection area; The first extension line is inclined by 20° to 70° relative to the first direction.

3. The signal acquisition circuit board according to claim 2, characterized in that: The first extension line gradually widens along a direction away from the thinnest portion, and the second extension line gradually widens along a direction away from the thinnest portion.

4. The signal acquisition circuit board according to claim 1, characterized in that: In the extended surface defined by the line pattern, the thinnest part has an extended path, and the vertical dimension of each position of the thinnest part along the extended path ranges from 0.08 mm to 0.5 mm; The thinnest part is a wave-shaped structure, and the curvature radius of any wave bend in the thinnest part ranges from 0.5 mm to 3 mm.

5. The signal acquisition circuit board according to claim 1, characterized in that: One end of the first extension line connected to the thinnest part forms two arc-shaped transition parts located on both sides of the thinnest part, and one end of the second extension line connected to the thinnest part forms another two arc-shaped transition parts located on both sides of the thinnest part, and the curvature radius of each arc-shaped transition part is 1 to 5 times the line width at the corresponding position.

6. The signal acquisition circuit board according to any one of claims 1 to 5, characterized in that: Also included is a protection layer covering the circuit pattern.

7. The signal acquisition circuit board according to claim 6, characterized in that: The protection layer is provided with at least one hole between the first connection area, the second connection area and the thinnest portion.

8. The signal acquisition circuit board according to claim 6, characterized in that: The thinnest portion and the second connection area are arranged opposite to each other along the second direction; The signal acquisition circuit board also includes a wide protection line, which is located between the thinnest part and the second connection area. The wide protection line is spaced apart from the line pattern and is closer to the thinnest part than the second connection area.

9. A battery module, characterized in that: include: at least two battery cells arranged along a first direction; and According to the signal acquisition circuit board as described in any one of claims 1 to 8, the first conductive sheet and the second conductive sheet are electrically connected to corresponding battery cells respectively.

10. An electrical device, characterized in that Comprising the battery module as claimed in claim 9.

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