Printed circuit board assembly for a battery device

Abstract

Printed circuit board assembly for a battery device, characterized in that it comprises the following: a printed circuit board body (110) wherein the printed circuit board body (110) comprises several parallel conductors (111) wherein the conductors (111) comprise a first metal and a second metal enclosing the outer surface of the first metal, wherein the hardness of the second metal is less than that of the first metal; a branch structure (120), wherein the branch structure (120) comprises a branch connection section (121) formed from the first metal and a measuring section (122) connected to the branch connection section (121), the measuring section (122) being designed to acquire battery information; wherein the branch connection section (121) is provided with at least two rows of through holes (a) along the arrangement direction of the multiple conductors (111), the positions of the through holes (a) being aligned with the positions of the conductors (111), and a solder joint being formed in at least one of the through holes (a), the solder joint being soldered to the respective conductor (111); a mounting plate (130), wherein the mounting plate (130) covers the surface of the solder joints and is firmly connected to the branch connection section (121), wherein the dimension of the mounting plate (130) along the arrangement direction of the multiple conductors (111) is W1 and the dimension of the through holes (a) along the arrangement direction of the multiple conductors (111) is R, wherein: 0.01 ≤ R / W1 ≤ 2; wherein the distance between the conductor (111) with the solder joint and its adjacent conductor (111) is H1, where: 0.3 mm ≤ H1 ≤ 2 mm; the width of the line (111) W2 is, where: 0.5≤R / W2≤2.

Description

Technical area

[0001] The present utility model relates to the technical field of printed circuit boards and in particular to a printed circuit board assembly for a battery device. Background technology

[0002] Currently, two main types of low-voltage data acquisition cables are used in battery-powered devices: FPC (Flexible Printed Circuit) and FFC (Flat Flexible Cable).

[0003] FPCs consist of an etched copper wire core encased in an insulating protective film. While thin and compact, they are expensive to manufacture, and the forming process requires significant cuts in the core material to create branches.

[0004] FFCs consist of a tinned copper core encased in a protective foil. While flexible and adaptable, they typically use a stamped fuse element, which can spark when it blows, increasing the risk of a short circuit in the battery pack. Etched fuses are spark-free but more expensive. Content of the utility model

[0005] The purpose of this utility model is to solve at least some of the aforementioned technical problems, and this purpose is achieved through the following technical solutions: In a first aspect, the present invention provides a printed circuit board assembly for a battery device, comprising a printed circuit board body, a branch structure, and a mounting plate. The printed circuit board body comprises several parallel conductors, the conductors comprising a first metal and a second metal encasing the outer surface of the first metal, the hardness of the second metal being lower than that of the first metal. The branch structure comprises a branch connection section formed from the first metal and a measuring section connected to the branch connection section, the measuring section being designed to establish a connection to the battery and to acquire battery information.The branch connection section is provided with at least two rows of through holes along the arrangement direction of the multiple conductors, the positions of the through holes being aligned with the positions of the conductors, and a solder joint being formed in at least one of the through holes, the solder joint being soldered to the respective conductor; the mounting plate is connected to the branch connection section, the dimension of the mounting plate along the arrangement direction of the multiple conductors being W1, and the dimension of the through holes (a) along the arrangement direction of the multiple conductors being R, wherein: 0.01 ≤ R / W1 ≤ 2; wherein the distance between the conductor with the solder joint and its adjacent conductor is H1, wherein: 0.3 mm ≤ H1 ≤ 2 mm; wherein the width of the conductor is W2, and wherein: 0.5 ≤ R / W2 ≤ 2.

[0006] The technical solution provided by the present utility model has at least the following technical effects: In the present utility model, the branch connection section is soldered to the main conductor of the printed circuit board via the solder joint in the through-hole and reinforced by the mounting plate to prevent bending and warping of the branch connection section due to the heat during soldering; in addition, the ratio between the diameter of the through-hole and the width of the mounting plate is designed accordingly, thereby not only achieving sufficient fixation of the branch connection section and preventing bending or even folding over, but also stabilizing the solder joint and avoiding high local resistance. Figures

[0007] To better link the content depicted in the drawings with the content described in the specific embodiments, a brief introduction to the accompanying drawings of the description follows. It is understood that the drawings below merely schematically illustrate some embodiments of the related technical solutions and the technical solutions of the present utility model. Those skilled in the art can, without any creative effort, also produce drawings illustrating other embodiments.

[0008] The notes on the drawings are as follows: Fig. Figure 1 is a schematic structural representation of a printed circuit board assembly for a battery device according to some embodiments of the present utility model; Fig. Figure 2 is an enlarged schematic structural representation at point A in Fig. 1; Fig. Figure 3 is a schematic structural representation of a branching structure according to some embodiments of the present utility model; Fig. Figure 4 is a schematic representation of the connection between the branch structure and the mounting plate according to some embodiments of the present utility model; Fig. Figure 5 is a schematic structural representation of a printed circuit board body according to some embodiments of the present utility model.

[0009] The reference symbols for the attached drawings are as follows: 100. Printed circuit board assembly for a battery device; 110. Printed circuit board body; 111. Lead; 120. Branch structure; 121. Branch connection section; 122. Measuring section; 123. Buffer arm; 130. Mounting plate; 140. Terminal seat; 150. Battery aluminum busbar; a. Through hole; g. Fuse structure; B1. First main body layer; B2. Second main body layer; E1. First branch structure; E2. Second branch structure; K1. First mounting plate; K2. Second mounting plate; X. First direction; Y. Second direction; Z. Third direction. Specific embodiments

[0010] To clarify the embodiments of the present utility model, the following description is combined with the attached drawings. The contents mentioned below represent only some embodiments of the present invention and are not intended to be an exhaustive list of all embodiments. Therefore, other embodiments derived from the following embodiments without requiring any original work are also within the scope of protection of the present utility model.

[0011] The terms used here serve solely to describe specific embodiments and are not intended to strictly restrict the technical solutions, unless the context clearly indicates otherwise. For example, the use of "ein," "eine," and "der / die / das" to modify a feature does not preclude the feature from being plural in other embodiments.

[0012] The terms "contain," "encompass," and "exhibit" are open-ended; they specify the presence of the mentioned features but do not preclude the possibility that the exemplary embodiments may also contain further features. Similarly, terms such as "first," "second," etc., used here to describe multiple features, serve solely to distinguish the features and do not imply any order unless the context clearly indicates otherwise.

[0013] It is understood that the terms "arrange," "connect," and "assemble" are to be interpreted broadly unless the context clearly indicates otherwise. For example, they may refer to a permanent connection, a detachable connection, or an integral connection; they may refer to a direct connection or an indirect connection via a medium. For experts in this field, the specific meanings of the aforementioned terms in the text are understandable depending on the specific circumstances.

[0014] Furthermore, to simplify the description, the text uses terms of spatial relative relationships to illustrate the position of one feature in relation to another, such as "inside," "outside," "end," "side," "top," "middle," "bottom," "high," "under," "axial," "circumferential," "radial," "horizontal," "vertical," "first direction," "second direction," etc. It is understood that the spatial relative relationship between two features should include other specific cases besides those shown in the accompanying diagrams.

[0015] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0016] With reference to the Fig. Figures 1 to 5 of the present utility model provide a printed circuit board assembly for a battery device 100, comprising a printed circuit board body 110, a branch structure 120, and a mounting plate 130. The printed circuit board body 110 comprises several parallel conductors 111, wherein the conductors 111 comprise a first metal and a second metal encasing the outer surface of the first metal, the hardness of the second metal being less than that of the first metal. The branch structure 120 comprises a branch connection section 121 formed from the first metal and a measuring section 122 connected to the branch connection section 121, the measuring section 122 being designed to acquire battery information.The branch connection section 121 is provided with at least two rows of through holes a along the arrangement direction of the multiple conductors 111, wherein the positions of the through holes a are aligned with the positions of the conductors 111 and a solder joint is formed in at least one of the through holes a, wherein the solder joint is soldered to the respective conductor 111; the mounting plate 130 is fixedly connected to the branch connection section 121, wherein the dimension of the mounting plate 130 along the arrangement direction of the multiple conductors 111 is W1 and the dimension of the through holes a along the arrangement direction of the multiple conductors 111 is R, wherein the following applies:; 0.01≤R / W1≤2.

[0017] In the present utility model, the branch connection section 121 is soldered to the conductor 111 of the printed circuit board body 110 via the solder joint in the through-hole a and reinforced by the mounting plate 130 to prevent bending and warping of the branch connection section 121 due to the heat during soldering; in addition, the ratio between the diameter of the through-hole a and the width of the mounting plate 130 is designed accordingly, whereby the mounting plate 130 not only achieves sufficient fixation of the branch connection section 121 and prevents bending or even folding over, but also ensures that the solder joint in the through-hole a and the conductor 111 are firmly soldered, thereby avoiding a large local resistance.

[0018] Furthermore, an excessively high R / W1 ratio results in a large solder joint and a narrow mounting plate 130, so that the fastening effect at the branch connection section 121 is insufficient and the branch connection section 121 may bend or even tip over; an excessively low R / W1 ratio results in a small solder joint and a mounting plate 130 that is too wide. Even if the fastening effect is sufficient, a small solder joint can lead to loose soldering and high local resistance, and an excessively wide mounting plate 130 occupies more internal space in the battery pack. Therefore, the R / W1 ratio should be moderate, for example, it could be 0.01, 1, or 2.

[0019] It should be noted that the mounting plate (130) can be a single piece or several separate pieces. In some embodiments, the length of the mounting plate (130), whether as a single piece or the total length of several separate pieces, is generally identical to the length of the flat, straight segment of the printed circuit board body 110. Furthermore, in some embodiments, R is the diameter of the through-hole a and W1 is the width of the mounting plate 130, wherein the mounting plate 130 is a hot-pressed film.

[0020] In particular, in some embodiments, the direction in which the multiple conductors (111) are arranged in parallel is a first direction X, the extension direction of the conductors is a second direction Y and the thickness direction of the mounting plate (130) is a third direction Z, wherein the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0021] In some embodiments, the distance between the conductor 111 with the solder joint and its adjacent conductor 111 is H1, where: 0.3 mm≤H1≤2 mm.

[0022] In the above embodiment, the distance between the conductors 111 is too small, which can lead to short circuits. If the distance is too large, the number of wires that can be routed in the printed circuit board body 110 may be too low, and it will not be possible to bundle multiple battery strings. The distance between the conductors 111 also determines the distance between the through-holes a. If the through-holes a are too close together, the strength of the branch connection section 121 will be insufficient. Therefore, the distance H1 between the conductors 111 should be moderate; for example, it could be 0.3 mm, 1 mm, or 2 mm.

[0023] In some embodiments, with reference to Fig. 3 each of the branch connection sections 121 along the extension direction of the lines 111 is provided with several rows of through bores a.

[0024] In some embodiments, the dimension of the branch connection section 121 along the extension direction of the lines 111 is L1, the number of through holes a is n and the area of ​​the through hole a is S, where: 0.3 ≤ L1 / (n*S) ≤ 0.6 and the unit is 1 / mm.

[0025] In the embodiment above, if the value of L1 / (n*S) is too small, this means that the proportion of through holes a in the branch connection section 121 is too large, and the branch connection section 121 is prone to breakage and damage during transport, forming, and soldering. Conversely, if the value of L1 / (n*S) is too large, this means that the through holes a in the branch connection section 121 are fewer and / or smaller, and the corresponding solder joints are also fewer and / or smaller, which is detrimental to the reliability of the soldering and leads to increased local resistance. Therefore, the L1 / (*S) ratio should be moderate; for example, it could be 0.3, 0.5, or 0.6, and the unit is 1 / mm.

[0026] It should be noted that each of the branch connection section 121 is provided with at least two columns of through holes a, the through holes in each column are spaced apart along the second direction Y and the through holes in each row are spaced apart along the second direction X.

[0027] In some embodiments, along the extension direction of the lines 111, the distance between two adjacent gaps of through holes is a P, where: 0.5 mm ≤ P ≤ 1.5 mm.

[0028] In some embodiments, the thickness of the mounting plate is 130 d, where: d ≥ 0.03 mm and P ≤ 1.2 mm.

[0029] If the through holes a in the above embodiment are too close together, the branch connection section 121 may not be sufficiently stable and may warp, requiring a thicker mounting plate 130.

[0030] It should be noted that the through holes do not have to be circular; they can also be rectangular or have other shapes. There are no restrictions in this regard.

[0031] In some embodiments, the dimension of the mounting plate 130 is along the extension direction of the lines 111 L2, where: 0.01 ≤ L1 / L2 ≤ 1.

[0032] In the embodiment above, if the L1 / L2 ratio is too small, this means that the width of the branch connection section 121 is too small, and consequently, the number or dimensions of the solder joints are also small, which negatively impacts the soldering reliability and current capacity. Conversely, if the L1 / L2 ratio is too large, this means that the width of the branch connection section 121 is large and that of the mounting plate 130 is small, making the positioning of the mounting plate 130 difficult during installation. Inaccurate positioning can easily lead to failure in pressing down the branch structure 120. Therefore, the L1 / L2 ratio should be moderate, for example, 0.01, 0.5, or 1.

[0033] In some embodiments, the width of the line is 111 W2, where: 0.5≤R / W2≤2.

[0034] In the above embodiment, if the R / W2 ratio is too high, this means that the width of the solder joint is too large compared to the conductor 111. If the distance between the conductors 111 is small, overlaps with adjacent conductors 111 can easily occur, leading to detection errors; if the R / W2 ratio is too low, this means that the width of the solder joint is too small compared to the conductor 111, which can lead to insufficient overcurrent. Therefore, the R / W2 ratio should be moderate, for example, it could be 0.5, 1, or 2.

[0035] It should be noted that the first metal in conductor 111 may be flat and its width direction is the first direction X, while the function of the second metal is to facilitate soldering, and it may completely or partially cover the first metal along its circumference. Furthermore, the second metal may also completely or intermittently cover the first metal along the second direction Y; conductor 111 as a whole may also be flat and its width direction is along the first direction X.

[0036] In some embodiments, the thickness of the mounting plate is 130 d, where: 0.03 mm ≤ d ≤ 0.1 mm and 0.0006 ≤ d / W1 ≤ 0.05.

[0037] In some embodiments, the fixing effect is insufficient if the mounting plate 130 is too thin, and the mounting plate 130 buckles easily. If the mounting plate 130 is too thick, it occupies more space in the third direction Z and is heavier. Therefore, the thickness d of the mounting plate 130 should be chosen moderately; for example, it could be 0.03, 0.05, or 0.1.

[0038] Furthermore, an excessively high d / W1 ratio means that the mounting plate 130 has a large thickness and a small width, which negatively impacts space savings, weight reduction, and positioning of the mounting plate 130; conversely, an excessively low d / W1 ratio means that the mounting plate 130 has a small thickness and a large width, and the mounting plate 130 itself is more likely to bend or be damaged due to insufficient strength. Therefore, the d / W1 ratio should be moderate, for example, 0.0006, 0.01, or 0.05.

[0039] In some embodiments, the dimension of the branch connection section 121 along the arrangement direction of the multiple lines 111 is W2, where: W2 ≤ W1 and 0.03 mm ≤ d ≤ 0.06 mm.

[0040] In the above embodiment, the dimension of the mounting plate 130 in the first direction X is larger than the size of the branch connection section 121, and the mounting plate 130 completely covers and extends beyond the branch connection section 121 to ensure that the branch connection section 121 does not warp. Therefore, the thickness of the mounting plate 130 can be chosen to be somewhat less; for example, d can be 0.03 mm, 0.05 mm, or 0.06 mm.

[0041] In some embodiments, the fastening plates (130) are provided at both ends of the branch connection section (121) in its thickness direction, where: 0.03 mm ≤ d ≤ 0.05 mm.

[0042] In the above embodiment, both side surfaces of the branch connection section 121 are fastened in the third direction Z by the mounting plate 130, so that the strength of the overall structure is sufficient and the thickness of the mounting plate 130 can be further reduced, for example d can be 0.03 mm, 0.04 mm or 0.05 mm.

[0043] In some embodiments, the mounting plate 130 is firmly connected to the branch connection section 121 and the circuit board body 110 by adhesive bonding.

[0044] In some embodiments, the multiple lines 111 are connected to the multiple branch connection sections 121 in a one-to-one correspondence, and each of the branch connection sections 121 is soldered to the line 111 via a solder joint located thereon, which is formed by a through-hole a corresponding to the line 111.

[0045] In some embodiments, the mounting plate 130 covers the solder joints on the multiple branch connection sections 121.

[0046] In the above embodiment, the mounting plate 130 is pressed directly against the solder joint, thereby securing the branch connection section 121 to prevent warping and at the same time ensure the insulating, dust- and dew-repellent effect of the solder joint.

[0047] In some embodiments, with reference to Fig. 2 of the printed circuit board body 110 comprising a first main body layer B1 and a second main body layer B2, which are stacked on top of each other, wherein the first main body layer B1 is connected to a first branch structure E1 and the second main body layer B2 is connected to a second branch structure E2; wherein the first branch structure E1 and the second branch structure E2 are distributed on both sides of the extension direction of the printed circuit board body 110.

[0048] In the above embodiment, the first branch structure E1 and the second branch structure E2 are arranged symmetrically to reduce branch bending. Furthermore, the first main body layer B1 and the second main body layer B2 are stacked so that the output terminal does not need to be bent, with two output terminals arranged on each of the two layers to facilitate subsequent direct insertion into the terminal seat 140 of the BMS (battery management system).

[0049] It should be noted that in some embodiments the flat, straight segments of the two main body layers are stacked in the third direction Z and the two branch structures 120 may be offset or symmetrically distributed in the first direction X.

[0050] In some embodiments, reference is made to Fig. 2 the first main body layer B1 and the second main body layer B2 are arranged between two layers of the mounting plates 130 and the total thickness between the two layers of the mounting plates 130 is D, where: D ≤ 150 µm.

[0051] In the above embodiment, the two main body layers are each provided on both sides in the third direction Z with a first mounting plate K1 and a second mounting plate K2, thus creating a stacked structure. If the overall thickness is too great, it occupies too much space and the sides are prone to cracking.

[0052] In some embodiments, the electrical conductivity of the first metal is greater than the electrical conductivity of the second metal, and the thickness of the first metal is d1 and the thickness of the second metal is d2, where: 1 ≤ d1 / d2 ≤ 2.5.

[0053] In the above embodiment, the main purpose of the second metal coating is to improve the solderability of the solder joint between the first metal and the branch connection section 121 and to prevent oxidation.

[0054] If the d1 / d2 ratio is too large, this means that the thickness of the second metal is insufficient and its effect is inadequate; however, the conductivity of the second metal is not as good as that of the first metal. If the d1 / d2 ratio is too small, i.e., the thickness of the second metal is too large, the overcurrent in the conductors 111 deteriorates. In some embodiments, d1 / d2 can be 1, 2, or 2.5.

[0055] The first metal can be a flat copper sheet with a rectangular cross-section and a thickness direction in the third direction Z, and the second metal can be a layer of tin applied to the surface of the first metal.

[0056] Furthermore, the thickness of the tin brush of the actual product is 0.2 mm and the thickness of the copper wire is 0.1 mm, ensuring that the tin can overflow from the through holes and increase the solder strength.

[0057] In some embodiments, the melting point of the first metal is higher than the melting point of the second metal, where: 0.1 ≤ R / W1 ≤ 2.

[0058] In the above embodiment, the solder joint of the second metal is relatively shallow to facilitate soldering, and at this stage, the solder joint can be made larger to reduce the occurrence of distortion. For example, R / W1 is preferably 0.1, 1, or 2.

[0059] In some embodiments, with reference to Fig. 3 a fuse structure g is provided on the branch structure 120.

[0060] In the above embodiment, the branch structure 120 is provided with a safety structure g which can be located closer to the measuring section 122, because the safety structure g has a shorter reaction time when the battery temperature is too high and the electrical connection needs to be disconnected, thus reacting faster and providing better protection.

[0061] In some embodiments, with reference to Fig. 3. A buffer arm 123 is provided between the branch connection section 121 and the measuring section 122. The fuse structure g is provided on the buffer arm 123, and the minimum distance between the fuse structure g and the measuring section 122 is H2, where: 1 mm ≤ H2 ≤ 25 mm. In some embodiments, H2 can be 1 mm, 10 mm, and 25 mm.

[0062] In the above embodiment, due to battery expansion, the battery row is extended along its arrangement direction and the dimensions of the cable harness assembly bodies are fixed, with the measuring section 122 and the battery aluminum busbar 150 being soldered and fastened, i.e., the relative positions of the branch connection section 121 and the measuring section 122 are fixed, so that the S-shaped buffer arm 123 between the two is designed to absorb the displacement through its deformation and thereby prevent the risk of breakage of the branch connection section 121 due to the expansion and contraction displacement of the battery.

[0063] It should be noted that the expansion and contraction direction of the battery pack during operation extends from the center of the battery pack to both sides along the second direction Y; furthermore, the buffer arm 123 has a curved structure.

[0064] In some embodiments, the distance between the fuse structure g and the solder joint H3 is, where: H3 ≥ 5 mm.

[0065] If, in the above embodiment, the distance between the locking structure g and the solder joint is too small, the locking structure g may fail during the soldering of the solder joint.

[0066] In some embodiments, the branch connection section 121 is an FPC branch structure encapsulated with a hot-pressed film, wherein: 0.02≤R / W1≤2.

[0067] In the above embodiment, the hardness of the branch encapsulated by the hot-pressed foil is increased and the probability of deformation is reduced, so that R / W1 can preferably be 0.2, 1 or 2.

[0068] In some embodiments, the printed circuit board body 110 is an FFC main body layer structure and the pull-off force after soldering the FPC branch structure to the FFC main body layer structure is F, where F ≥ 8 N.

[0069] If the pulling force is too low in the above embodiment, it can be easily pulled off.

[0070] In summary, the present utility model, in some embodiments, provides a printed circuit board assembly 100 for a battery device that uses FFC (tinned copper) as the circuit board body 110 and FPC (etched copper wire) as the branch structure 120, which is then encapsulated with a mounting plate 130; the overall flexibility of the FFC is taken into account and production costs are reduced; at the same time, the fuse structure g formed by the etched FPC is located closer to the measuring section 122, which is safer and does not generate sparks; furthermore, stacked main body layers can be formed, for example, the upper and lower layers of the FFC, to accommodate batteries on both sides and form a two-layer plug-in structure that is plugged directly into the BMS, thereby reducing the overall width of the wiring harness and creating more space in the battery pack.

[0071] It should be noted that the embodiments of the present utility model merely illustrate the structure of the printed circuit board assembly 100 for a battery device, which is related to the improvements of the present application. However, this does not mean that no other structures are present; for example, the printed circuit board assembly 100 for a battery device also includes a terminal seat 140, which is electrically connected to the printed circuit board body 110, and / or a battery aluminum busbar 150, which is electrically connected to the measuring section 122, etc. Further structures are not described individually here.

[0072] In particular, the term “and / or” in the present utility model shall be understood as follows: In the first case, the term “and / or” between the first subject and second subject encompasses one of the following meanings: (1) only the first subject; (2) only the second subject; and (3) the first subject and second subject.

[0073] In the second case, the term "and / or" between the last two subjects of three or more subjects means that at least one of the multiple subjects is included. For example, "the first subject, the second subject and / or the third subject" has the same meaning as "the first subject and / or the second subject and / or the third subject," in particular including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) the first subject and the second subject without the third subject; (5) the first subject and the third subject without the second subject; (6) the second subject and the third subject without the first subject; and (7) the first subject, the second subject, and the third subject.

[0074] Although the embodiments of the present utility model are described in conjunction with the figures, those skilled in the art in this field may make various modifications and variations without deviating from the concept of the present utility model, and such modifications and variations are all within the scope defined by the attached claims.

Claims

[1] Printed circuit board assembly for a battery device, characterized by that it includes the following: a printed circuit board body (110), wherein the printed circuit board body (110) comprises several parallel conductors (111), wherein the conductors (111) comprise a first metal and a second metal enclosing the outer surface of the first metal, wherein the hardness of the second metal is less than that of the first metal; a branch structure (120), wherein the branch structure (120) comprises a branch connection section (121) formed from the first metal and a measuring section (122) connected to the branch connection section (121), the measuring section (122) being designed to acquire battery information; wherein the branch connection section (121) is provided with at least two rows of through holes (a) along the arrangement direction of the multiple conductors (111), the positions of the through holes (a) being aligned with the positions of the conductors (111), and a solder joint being formed in at least one of the through holes (a), the solder joint being soldered to the respective conductor (111); a mounting plate (130), wherein the mounting plate (130) covers the surface of the solder joints and is firmly connected to the branch connection section (121), wherein the dimension of the mounting plate (130) along the arrangement direction of the multiple conductors (111) is W1 and the dimension of the through holes (a) along the arrangement direction of the multiple conductors (111) is R, wherein: 0.01 ≤ R / W1 ≤ 2; wherein the distance between the conductor (111) with the solder joint and its adjacent conductor (111) is H1, where: 0.3 mm ≤ H1 ≤ 2 mm; the width of the line (111) W2 is, where: 0.5≤R / W2≤2. [2] Printed circuit board assembly for a battery device according to claim 1, characterized by , that each of the branch connection sections (121) is provided with several rows of through holes (a) along the extension direction of the lines (111). [3] Printed circuit board assembly for a battery device according to claim 2, characterized by , that the dimension of the branch connection section (121) along the extension direction of the lines (111) is L1, the number of through holes (a) is n and the area of ​​the through hole (a) is S, where: 0.3 ≤ L1 / (n*S) ≤ 0.6 and the unit is 1 / mm. [4] Printed circuit board assembly for a battery device according to claim 3, characterized by , that the dimension of the mounting plate (130) along the extension direction of the lines (111) is L2, where: 0.01≤ L1 / L2 ≤ 1. [5] Printed circuit board assembly for a battery device according to claim 1, characterized by , that the thickness of the mounting plate (130) is d, where: 0.03 mm ≤ d ≤ 0.1 mm and 0.0006 ≤ d / W1 ≤ 0.

05. [6] Printed circuit board assembly for a battery device according to claim 5, characterized by, that the dimension of the branch connection section (121) along the arrangement direction of the multiple lines (111) is W2, where: W2 ≤ W1 and 0.03 mm ≤ d ≤ 0.06 mm. [7] Printed circuit board assembly for a battery device according to claim 5, characterized by , that the fastening plates (130) are provided at both ends of the branch connection section (121) in its thickness direction, wherein: 0.03 mm ≤ d ≤ 0.05 mm. [8] Printed circuit board assembly for a battery device according to claim 1, characterized by , that the mounting plate (130) is firmly connected to the branch connection section (121) and the printed circuit board body (110) by adhesive bonding. [9] Printed circuit board assembly for a battery device according to claim 1, characterized by, that the multiple lines (111) are connected to the multiple branch connection sections (121) in a one-to-one correspondence and each of the branch connection sections (121) is soldered to the line (111) via a solder joint located thereon, which is formed by a through hole (a) corresponding to the line (111). [10] Printed circuit board assembly for a battery device according to claim 9, characterized by , that the mounting plate (130) covers the solder joints on the multiple branch connection sections (121). [11] Printed circuit board assembly for a battery device according to claim 1, characterized by, that the printed circuit board body (110) has a first main body layer (B1) and a second main body layer (B2) stacked on top of each other, wherein the first main body layer (B1) is connected to a first branch structure (E1) and the second main body layer (B2) is connected to a second branch structure (E2); wherein the first branch structure (E1) and the second branch structure (E2) are distributed on both sides of the extension direction of the printed circuit board body (110). [12] Printed circuit board assembly for a battery device according to claim 11, characterized by , that the first main body layer (B1) and the second main body layer (B2) are arranged between two layers of the mounting plates (130) and the total thickness between the two layers of the mounting plates (130) is D, where: D ≤ 150 µm. [13] Printed circuit board assembly for a battery device according to claim 1, characterized by, that the electrical conductivity of the first metal is greater than the electrical conductivity of the second metal and the thickness of the first metal is d1 and the thickness of the second metal is d2, where: 1 ≤ d1 / d2 ≤ 2.

5. [14] Printed circuit board assembly for a battery device according to claim 1, characterized by , that the melting point of the first metal is higher than the melting point of the second metal, where: 0.1 ≤ R / W1 ≤ 2. [15] Printed circuit board assembly for a battery device according to claim 1, characterized by , that a fuse structure (g) is provided on the branch structure (120). [16] Printed circuit board assembly for a battery device according to claim 15, characterized by, that a buffer arm (123) is provided between the branch connection section (121) and the measuring section (122), the fuse structure (g) is provided on the buffer arm (123) and the minimum distance between the fuse structure (g) and the measuring section (122) is H2, where: 1 mm ≤ H2 ≤ 25 mm. [17] Printed circuit board assembly for a battery device according to claim 16, characterized by , that the distance between the fuse structure (g) and the solder joint H3 is, where: H3 ≥ 5 mm. [18] Printed circuit board assembly for a battery device according to any one of claims 1 to 17, characterized by , that the branch connection section (121) is an FPC branch structure encapsulated with a hot-pressed film, where: 0.2 ≤ R / W1 ≤ 2. [19] Printed circuit board assembly for a battery device according to claim 18, characterized by, that the printed circuit board body (110) is an FFC main body layer structure and the pull-off force after soldering the FPC branch structure to the FFC main body layer structure is F, where: F ≥ 8 N.

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