Signal transmission line assembly, signal acquisition device, battery module and battery system

Abstract

The utility model relates to the technical field of new energy, in particular to a signal transmission line assembly and related products thereof, and the cost of the signal transmission line assembly can be reduced. The signal transmission line assembly comprises an insulating sheath formed by a plastic profile, the insulating sheath is provided with a plurality of threading holes which are arranged in a penetrating manner along the length direction of the insulating sheath and are separated from one another, and the plurality of threading holes are arranged into a plurality of hole groups which are sequentially separated along the width direction of the insulating sheath; in the width direction, the lengths of the threading holes in the plurality of hole groups are gradually reduced in sequence; and the plurality of wires penetrate through the plurality of threading holes in a one-to-one correspondence manner, and the wires are enameled wires or metal bare wires.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a signal transmission line assembly, a signal acquisition device, a battery module and a battery system. Background Art

[0002] In order to monitor the operating voltage and operating temperature of the battery cells in the battery module, it is necessary to install a device for collecting voltage and temperature signals on the battery module, and the device at least includes a signal transmission component capable of transmitting electrical signals.

[0003] At present, the signal transmission components used in battery modules are mainly divided into three categories: one is FPC line (Flexible Printed Circuit). The second is a bundled wire harness consisting of multiple plastic-coated wires. The third is PCBA (Printed Circuit Board Assembly). The above three solutions have their own advantages and disadvantages and can be applied to different scenarios.

[0004] How to reduce the cost of signal transmission components to enhance the market competitiveness of products has always been a concern of the industry. Summary of the invention

[0005] The purpose of this application is to propose a signal transmission line assembly, a signal acquisition device, a battery module and a battery system, in order to reduce the cost of the signal transmission line assembly.

[0006] In a first aspect, the present application provides a signal transmission line assembly, comprising:

[0007] An insulating sheath formed of a plastic profile, the insulating sheath having a plurality of threading holes which are arranged through and spaced apart from each other along the length direction of the insulating sheath, the plurality of threading holes being arranged into a plurality of hole groups which are sequentially spaced apart along the width direction of the insulating sheath; wherein along the width direction, the lengths of the threading holes in the plurality of hole groups decrease sequentially;

[0008] A plurality of conducting wires are arranged in a one-to-one correspondence in the plurality of wire threading holes, and the conducting wires are enameled wires or bare metal wires.

[0009] In some possible implementations, the insulating sheath has:

[0010] The first end face, and

[0011] a plurality of second end surfaces, each of the plurality of second end surfaces being opposite to the first end surface in the length direction, and the plurality of second end surfaces being spaced apart from each other in the length direction;

[0012] Wherein, each of the threading holes in the same hole group extends from the first end surface to the same second end surface, and each of the threading holes in different hole groups extends to different second end surfaces respectively.

[0013] In some possible implementations, the insulating sheath has:

[0014] A slit extending from an edge of the corresponding second end surface along the length direction;

[0015] The bendable section extends from the root of the slit to the corresponding second end surface and is configured to be bendable in a manner of deforming around the root.

[0016] In some possible implementations, each of the hole groups includes at least two threading holes, and the threading holes in the same hole group are arranged at intervals along the thickness direction of the insulating sheath;

[0017] The bendable section is configured to be bendable in a manner that deforms around the root and in the thickness direction.

[0018] In some possible implementations, the material forming the insulating sheath includes one of the following: nylon, PTFE, PVC, PC, and PE.

[0019] In a second aspect, the present application proposes a signal acquisition device, comprising:

[0020] Electrical connectors,

[0021] Multiple signal acquisition terminals,

[0022] The signal transmission line assembly as described in the first aspect;

[0023] Each of the wires has a first end and a second end extending out of the wire threading hole and opposite to each other, the first ends of the wires corresponding to the same hole group are welded to the same signal acquisition terminal, the first ends of the wires corresponding to different hole groups are welded to different signal acquisition terminals, and the second end of each wire is connected to the electrical connector.

[0024] In some possible implementations, the signal acquisition terminal has:

[0025] A metal conductive sheet, which is used to be welded to a conductive bar connected to the electrode terminal of the battery cell;

[0026] A PCB board, which is welded and fixed to the metal conductive sheet, and comprises: a first soldering pad, a second soldering pad, a third soldering pad electrically connected to the metal conductive sheet, and a temperature sensor electrically connected between the second soldering pad and the third soldering pad;

[0027] In each of the wires corresponding to each of the hole groups, the first ends of three wires are respectively welded to the first pad, the second pad and the third pad.

[0028] In a third aspect, the present application proposes a battery module, comprising:

[0029] Multiple battery cells,

[0030] The signal acquisition device as described in the second aspect;

[0031] Wherein, the plurality of battery cells are stacked along the length direction, and the plurality of signal acquisition terminals are respectively connected to the plurality of battery cells;

[0032] In some possible implementations, a blister bracket is further included, and the insulating sheath is fixed to the blister bracket by heat riveting.

[0033] In a fourth aspect, the present application proposes a battery system, comprising:

[0034] The battery module as described in the third aspect;

[0035] A battery box, wherein the battery box accommodates the battery module;

[0036] another electrical connector, the another electrical connector being releasably connectable to the electrical connector;

[0037] The battery management system BMS is connected to the other electrical connector via a cable.

[0038] According to the signal transmission line device provided by the present application, it includes: an insulating sheath formed by a plastic profile, the insulating sheath has a plurality of threading holes that are arranged through and separated from each other along the length direction of the insulating sheath, and the plurality of threading holes are arranged into a plurality of hole groups that are sequentially separated along the width direction of the insulating sheath; wherein, along the width direction, the lengths of the threading holes in the plurality of hole groups decrease in sequence; a plurality of wires, the plurality of wires are correspondingly arranged in the plurality of threading holes, and the wires are enameled wires or bare metal wires. In this way, the wires in different hole groups can be led out from different positions in the length direction of the insulating sheath, and are adapted to the positions of the battery cells stacked and arranged in the battery module, so that the wires in each hole group can be easily connected to the corresponding battery cells in the battery module. In addition, the insulating sheath combination formed by enameled wire or bare metal wire + plastic profile constitutes a device for transmitting signals, and the production cost is significantly reduced compared to the FPC wire, plastic-coated wire or FPCA board used in the traditional scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0040] Figure 1 1 is a top view schematic diagram of a battery module provided in one embodiment of the present application.

[0041] Figure 2 yes Figure 1 Schematic diagram of top view of the signal acquisition device.

[0042] Figure 3 yes Figure 1 A three-dimensional schematic diagram of the signal acquisition device.

[0043] Figure 4 yes Figure 3 A partial enlarged view of .

[0044] Figure 5 yes Figure 3 A partial enlarged view of the insulating sheath.

[0045] Figure 6 yes Figure 1 Schematic diagram of the structure of the signal transmission line component.

[0046] Figure 7 yes Figure 1 Schematic diagram of the structure of the signal transmission line component when the bendable section has not been bent.

[0047] Figure 8 yes Figure 7 A partial enlarged view of .

[0048] Fig. 9 Schematic diagram of a plastic profile being cut.

[0049] Fig.10 and Fig.11 They are schematic diagrams of the structures of the two parts of the profile segment, which are separated by the cutoff line X.

[0050] Description of reference numerals:

[0051] F1-length direction, F2-width direction, F3-thickness direction, F4-second length direction, F5-second width direction, F6-second thickness direction;

[0052] 1-Battery monomer;

[0053] 2-signal acquisition terminal, 21-conductive sheet, 22-PCB board;

[0054] 3-insulating sheath, 3A-first end face, 3B-second end face, 31-threading hole, 32-bendable section, 33-cutting slit;

[0055] 4- Wire;

[0056] 5-conductive bar;

[0057] 60-plastic profile, 6-profile segment, 6A-third end face, 6B-fourth end face, 61-branch segment. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the embodiment of the present application will be clearly and completely described below in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application. It can be understood that, in the absence of conflict, some technical means of the various embodiments described herein can be replaced or combined with each other.

[0059] In the description of this application, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described and do not have any order or technical meaning. Therefore, an object defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects, and, for example, the term "first element" itself does not mean the existence of the "second element", and the term "second element" itself does not mean the existence of the "first element". In addition, "one" or "a" and similar words do not indicate a quantity limitation, but rather indicate the existence of at least one, and "multiple" means not less than two.

[0060] In the description of this application, the terms "including", "having" indicate the existence of the features, numbers, operations, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, numbers, operations, elements and / or their combinations. For example, "the battery pack includes two cells, each of which has a feature S", which means that the battery pack includes at least two cells each having the feature S. Obviously, this does not exclude that the battery pack may also include a third cell that does not have the feature S, nor does it exclude that the battery pack may also include a fourth cell that also has the feature S.

[0061] In the description of the present application, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present application include a particular feature, structure or characteristic described in conjunction with the embodiment. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in the present specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0062] Figure 1 This is a top view of a battery module provided in one embodiment of the present application, which includes a plurality of battery cells 1, a plurality of conductive bars 5 and a signal acquisition device. Figure 1 The battery cell 1 is depicted in dotted lines.

[0063] Multiple battery cells 1 are stacked and arranged in sequence along the stacking direction. The conductive bar 5 electrically connects the positive terminal of the battery cell 1 to the negative terminal of the adjacent battery cell 1, thereby connecting the battery cells 1 in series. The conductive bar 5 can be an aluminum bar or a copper bar.

[0064] Figure 2 for Figure 1 A top view of the signal acquisition device. Figure 3 for Figure 1 A three-dimensional schematic diagram of the signal acquisition device. Figure 4 yes Figure 3 A partial enlarged view of Figure 5 yes Figure 4 The signal acquisition device comprises two signal transmission line components and an electrical connector (not shown), and each signal transmission line component is connected to a plurality of signal acquisition terminals 2.

[0065] The signal transmission line assembly includes an insulating sheath 3 formed by a plastic profile 60, and a plurality of wires 4. The insulating sheath 3 has a plurality of threading holes 31 which are arranged through and separated from each other along the length direction F1 of the insulating sheath 3, and the plurality of threading holes 31 are arranged into a plurality of hole groups which are sequentially separated along the width direction F2 of the insulating sheath 3, each hole group includes at least two (specifically three in this embodiment) threading holes 31, and the threading holes 31 in the same hole group are arranged at intervals along the thickness direction F3 of the insulating sheath 3.

[0066] In this embodiment, the length direction F1 of the insulating sheath 3 is consistent with the stacking direction of the battery cells 1. The insulating sheath 3 is arranged on the top side of the battery module.

[0067] The plurality of wires 4 are arranged in correspondence with each other in the plurality of wire holes 31, and the wires 4 are enameled wires or bare metal wires without insulating sheaths (for example, copper wires with a diameter of 0.3 mm to 1.0 mm). Each wire 4 has a first end extending out of the wire hole 31 and opposite to each other (at Figure 2 The upper end of the wire 4) and the second end (in Figure 2 The first ends of the wires 4 corresponding to the same hole group are welded to the same signal collection terminal 2, and the first ends of the wires 4 corresponding to different hole groups are welded to different signal collection terminals 2. The second end of each wire 4 is connected to an electrical connector not shown.

[0068] In some embodiments, two signal transmission line assemblies may share the same electrical connector.

[0069] exist Figure 1 In the figure, the two insulating sheaths 3 corresponding to the two signal transmission line components are separated by a certain distance in order to avoid the explosion-proof hole positions on each battery cell.

[0070] In some embodiments, the insulating sheath 3 made of plastic material can be fixed to the multiple blister brackets of the battery module itself by heat riveting. In this way, the insulating sheath 3 can compensate for the defects of low strength and easy deformation of the blister bracket, thereby helping to improve the stability of the overall structure of the battery module.

[0071] See also Figures 1 to 3 , Figures 6 to 8 Combined with Figure 4 and Figure 5 , along the width direction F2, the lengths of the threading holes 31 in the plurality of hole groups decrease in sequence. Figure 5 The seven hole groups on the middle insulating sheath 3 are called the first to seventh hole groups from left to right, and the length of the three threading holes 31 in the seventh hole group is less than the length of the three threading holes 31 in the sixth hole group, less than the length of the three threading holes 31 in the fifth hole group, less than the length of the three threading holes 31 in the fourth hole group, less than the length of the three threading holes 31 in the third hole group, less than the length of the three threading holes 31 in the second hole group, less than the length of the three threading holes 31 in the first hole group. In this way, the wires 4 in different hole groups can be led out to different battery cells 1 from different positions in the length direction F1 of the insulating sheath 3, and adapted to the position of each battery cell 1.

[0072] For more details, please see Figures 1 to 8, the insulating sheath 3 has a first end face 3A and a plurality of second end faces 3B, and the number of the second end faces 3B is the same as the number of the aforementioned hole groups, which is also seven. Each of the aforementioned plurality of second end faces 3B is opposite to the first end face 3A in the aforementioned length direction F1, and the plurality of second end faces 3B are spaced apart from each other (or staggered) in the length direction F1. Among them, each threading hole 31 in the same hole group extends from the first end face 3A to the same second end face 3B, and each threading hole 31 in different hole groups extends to different second end faces 3B respectively. Therefore, the first end of each wire 4 is led out from the corresponding first end face 3A, and the second end of each wire 4 is led out from the second end face 3B. In this way, on the one hand, the first end of the wire 4 in different hole groups is led out from different second end faces 3B to be connected to different battery cells 1, and on the other hand, the second end of the wire 4 in all hole groups is led out from the same first end face 3A, so that these wires 4 can be conveniently processed in a centralized manner, such as connecting the aforementioned electrical connector.

[0073] See also Figure 4 Combined with Figures 1 to 3 The signal acquisition terminal 2 includes a PCB board 22 and a metal conductive sheet 21 welded and fixed to the PCB board 22. The metal conductive sheet 21 is welded to the conductive bar 5 to obtain the voltage and temperature of the battery cell 1 via the conductive bar 5. The PCB board 22 is provided with a temperature sensor, and a first pad, a second pad, and a third pad separated from each other, wherein the metal conductive sheet 21 is electrically connected to the first pad via a conductive trace and a conductive via on the PCB board 22, and the temperature sensor is electrically connected between the second pad and the third pad.

[0074] Correspondingly, please refer to Figures 1 to 5 In this embodiment, each hole group includes three threading holes 31 for respectively inserting three wires 4. One of the three wires 4 is a voltage acquisition wire, and the other two are temperature acquisition wires. The first end of the voltage acquisition wire is welded to the first welding pad to obtain the voltage of the corresponding battery cell 1 from the first welding pad; the first ends of the two temperature acquisition wires are respectively welded to the second welding pad and the third welding pad to obtain the temperature of the corresponding battery cell 1 from the second welding pad and the third welding pad.

[0075] The metal conductive sheet 21 may be a nickel sheet.

[0076] In addition, the insulating sheath 3 also has a plurality of slits 33 and a plurality of bendable sections 32. Each slit 33 extends from the edge of the corresponding second end face 3B along the aforementioned length direction F1, and each bendable section 32 extends from the root of the corresponding slit 33 to the corresponding second end face 3B, and is configured to be bent in a manner of deforming around the root of the slit 33. In this way, between the main structure of the insulating sheath and the signal acquisition terminal 2, the wire 4 can be insulated and protected by the bendable section 32, rather than exposing the wire 4 between the main structure of the insulating sheath and the signal acquisition terminal 2 to the environment, thereby reducing the insulation risk of the wire 4. In some application scenarios, the bendable section 32 made of plastic material can be heat treated to soften it, and then be bent.

[0077] exist Figure 1 In the embodiment, the bendable section 32 is bent in such a manner as to be deformed around the root of the slit 33 and in the aforementioned thickness direction F3.

[0078] Figure 7 and Figure 8 The configuration of the bendable section 32 of the insulating sheath 3 when it is not bent is shown.

[0079] In other embodiments, the insulating sheath 3 may not have the slit 33 and the bendable section 32 .

[0080] The material forming the insulating sheath 3, i.e. the material forming the plastic profile 60, can be nylon, polycarbonate (PC), polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE) or polyethylene (PE). Among them, the insulating sheath 3 of polytetrafluoroethylene has excellent smoothness, so the wire 4 can be easily inserted into the threading hole 31.

[0081] The outer insulation layer of the traditional FPC harness or plastic-covered wire is relatively delicate and easily scratched, which poses an insulation risk. According to the signal transmission line assembly provided in the embodiment of the present application, the outer insulating sheath is formed of a plastic profile, which has excellent structural strength and insulation capacity, and can easily meet the insulation voltage of more than 4000V. In addition, in the case where there are a large number of battery cells in the battery module, if the signal transmission line of the module adopts the traditional plastic-covered wire, the overall height will be high after the harness is bundled, and the height is not easy to control. The signal transmission line assembly provided in the embodiment of the present application overcomes this problem. In addition, the insulating sheath 3 of the signal transmission line assembly provided in the embodiment of the present application is an extruded plastic profile with a relatively high structural strength, so it can be easily grasped and placed by a robot to achieve automated installation on the battery module.

[0082] See also Figures 9 to 11 Combined with Figure 7 and 8 The present application also provides a method for manufacturing the above-mentioned signal transmission line assembly, the method comprising:

[0083] S1, a plastic profile 60 extending in a straight line is produced by extrusion, wherein the plastic profile 60 has a plurality of holes extending along the length direction F1 of the plastic profile 60 (for the convenience of distinction and description, the length direction F1 of the plastic profile 60 is referred to as the second length direction F4) and separated from each other, and the plurality of holes are arranged into a plurality of hole groups (for the convenience of distinction and description, the hole groups are referred to as second hole groups) separated in sequence along the width direction F2 of the plastic profile 60 (for the convenience of distinction and description, the width direction F2 of the plastic profile 60 is referred to as the second width direction F5), and each second hole group includes a plurality of holes separated in sequence along the thickness direction F3 of the plastic profile 60 (for the convenience of distinction and description, the thickness direction F3 of the plastic profile 60 is referred to as the second thickness direction F6). The hole corresponds to the threading hole 31 in the insulating sheath 3 of the signal transmission line assembly finally formed.

[0084] S2, such as Fig. 9 As shown, the plastic profile 60 is cut along the second width direction F5 and the second thickness direction F6 to obtain a plurality of profile segments 6, wherein the profile segment 6 has a third end face 6A and a fourth end face 6B opposite to each other along the second length direction F4. The third end face 6A corresponds to the aforementioned first end face 3A of the insulating sheath 3 of the signal transmission line assembly finally formed.

[0085] S3, such as Fig.10 and Fig.11 As shown, a plurality of slits 33 extending along the second length direction F4 and spaced apart in sequence in the second width direction F5 are cut from the fourth end face 6B, and the plurality of slits 33 define a plurality of branch segments 61 on the profile segment 6 extending from the fourth end face 6B along the second length direction F4 and arranged in sequence in the second width direction F5, wherein the same branch segment 61 corresponds to the same second hole group, and different branch segments 61 correspond to different second hole groups, respectively.

[0086] S4, for all the branch segments 61 except the branch segment 61 at the endmost side in the second width direction F5, these branch segments 61 are cut at their respective midway positions (i.e., non-end positions); and along the second width direction F5, the cutting positions of these branch segments 61 are arranged in sequence along the second length direction F4. Thus, the following is obtained: Figure 7 and Figure 8 In the structure shown, the branch segment 61 left after being cut off corresponds to the aforementioned bendable segment 32 .

[0087] S5, insert the enameled wire or the bare metal wire into the hole.

[0088] In addition, the embodiment of the present application also provides a battery system, including a battery box, a battery module of the above structure, another electrical connector and a battery management system BMS. The battery box accommodates the battery module, the other electrical connector is releasably connected to the aforementioned electrical connector of the signal acquisition device, and the battery management system BMS is connected to the other electrical connector via a cable.

Claims

1. A signal transmission line assembly, characterized in that: include: An insulating sheath formed of a plastic profile, the insulating sheath having a plurality of threading holes which are arranged through and spaced apart from each other along the length direction of the insulating sheath, the plurality of threading holes being arranged into a plurality of hole groups which are sequentially spaced apart along the width direction of the insulating sheath; wherein along the width direction, the lengths of the threading holes in the plurality of hole groups decrease sequentially; A plurality of conducting wires are arranged in a one-to-one correspondence in the plurality of wire threading holes, and the conducting wires are enameled wires or bare metal wires.

2. The signal transmission line assembly according to claim 1, characterized in that: The insulating sheath comprises: The first end face, and a plurality of second end surfaces, each of the plurality of second end surfaces being opposite to the first end surface in the length direction, and the plurality of second end surfaces being spaced apart from each other in the length direction; Wherein, each of the threading holes in the same hole group extends from the first end surface to the same second end surface, and each of the threading holes in different hole groups extends to different second end surfaces respectively.

3. The signal transmission line assembly according to claim 2, characterized in that: The insulating sheath comprises: A slit extending from an edge of the corresponding second end surface along the length direction; The bendable section extends from the root of the slit to the corresponding second end surface and is configured to be bendable in a manner of deforming around the root.

4. The signal transmission line assembly according to claim 3, characterized in that: Each of the hole groups includes at least two threading holes, and the threading holes in the same hole group are arranged at intervals along the thickness direction of the insulating sheath; The bendable section is configured to be bendable in a manner that deforms around the root and in the thickness direction.

5. The signal transmission line assembly according to claim 1, characterized in that: The material forming the insulating sheath includes one of the following: nylon, PTFE, PVC, PC, PE.

6. A signal acquisition device, characterized in that: include: Electrical connectors, Multiple signal acquisition terminals, The signal transmission line assembly according to any one of claims 1 to 5; Each of the wires has a first end and a second end extending out of the wire threading hole and opposite to each other, the first ends of the wires corresponding to the same hole group are welded to the same signal acquisition terminal, the first ends of the wires corresponding to different hole groups are welded to different signal acquisition terminals, and the second end of each wire is connected to the electrical connector.

7. The signal acquisition device according to claim 6, characterized in that: The signal acquisition terminal has: A metal conductive sheet, which is used to be welded to a conductive bar connected to an electrode terminal of a battery cell; A PCB board, which is welded and fixed to the metal conductive sheet, and comprises: a first soldering pad, a second soldering pad, a third soldering pad electrically connected to the metal conductive sheet, and a temperature sensor electrically connected between the second soldering pad and the third soldering pad; In each of the wires corresponding to each of the hole groups, the first ends of three wires are respectively welded to the first pad, the second pad and the third pad.

8. A battery module, characterized in that: include: Multiple battery cells, The signal acquisition device according to claim 6 or 7; The plurality of battery cells are stacked along the length direction, and the plurality of signal acquisition terminals are respectively connected to the plurality of battery cells.

9. The battery module according to claim 8, characterized in that: It also includes a blister bracket, and the insulating sheath is fixed to the blister bracket by heat riveting.

10. A battery system, characterized in that: include: The battery module according to claim 8 or 9; A battery box, wherein the battery box accommodates the battery module; another electrical connector, the another electrical connector being releasably connectable to the electrical connector; The battery management system BMS is connected to the other electrical connector via a cable.

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