Battery pack state detection circuit and production device therefor

Abstract

The present invention relates to the field of circuit manufacturing, and in particular to a battery pack state detection circuit and a production device therefor. The battery pack state detection circuit comprises a state sensor and a multi-bend folded wire. The state sensor is arranged on a monitored battery pack and is electrically connected to a signal transmission bus by means of the multi-bend folded wire. The multi-bend folded wire comprises a plurality of serpentine bent segments and straight segments. The serpentine bent segments and the straight segments are alternately arranged on the multi-bend folded wire; the plurality of straight segments are parallel to each other, and insulating outer sheath layers of adjacent straight segments are bonded with each other; and the bonding force between every two adjacent straight segments is in direct proportion to the distance from the corresponding bonding position to the state sensor, and the bonding force is smaller than a preset structural force bearing threshold. The present invention improves the operating stability and prolongs the service life of the battery pack state detection circuit, further guarantees the safety of the signal transmission bus, and greatly reduces the later maintenance and repair costs.

Description

Battery pack state detection circuit and production equipment thereof TECHNICAL FIELD

[0001] The present application relates to the field of circuit manufacturing, in particular to a battery pack state detection circuit and production equipment thereof. BACKGROUND

[0002] With the development and application of new energy technology, more and more devices use power battery packs as core energy components to provide power for the entire device, and its safety has always been a focus in the industry. In order to ensure the safe operation of the power battery pack, the state of the battery pack (such as temperature state) needs to be monitored and recorded in real time. In related technologies, a signal transmission bus is usually installed on the surface of the battery pack, and state detection elements are arranged on both sides of the signal transmission bus. These state detection elements transmit signals with the signal transmission bus through an electrical connection structure, and the state detection elements and the electrical connection structure constitute the state detection circuit of the power battery pack.

[0003] However, when the battery pack is rapidly charged, the high-power charging will cause a strong heating effect, the overall temperature will rise, and the battery pack will also expand and contract significantly, causing the distance between the signal transmission bus fixed on the surface of the battery pack and the state detection element to change greatly. In related technologies, the electrical connection structure connecting the state detection element and the signal transmission bus is usually a straight wire or an S-shaped copper sheet, which is relatively rigid and has poor flexibility. After experiencing multiple thermal expansion and contraction, it is easy to break or disconnect, and even the signal transmission bus may be damaged by being pulled.

[0004] Therefore, how to provide an electrical connection structure with excellent flexibility to improve the working stability and service life of the battery pack state detection circuit is a problem that needs to be solved by those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a battery pack state detection circuit and production equipment thereof to solve the problem of poor flexibility of the electrical connection structure of the battery pack state detection circuit in the prior art, which leads to poor working stability and short service life of the battery pack state detection circuit.

[0006] To solve the above technical problems, the present application provides a battery pack state detection circuit, comprising a state sensor and a multi-bend folded wire.

[0007] The state sensor is arranged on the monitored battery pack and is electrically connected to the signal transmission bus through the multi-bend folded wire.

[0008] The multi-bend folded wire comprises a plurality of bend and winding segments and straight segments.

[0009] The bend and winding segments and the straight segments are alternately arranged on the multi-bend folded wire.

[0010] The plurality of straight segments are parallel to each other, and the insulating outer cladding of adjacent straight segments are bonded to each other;

[0011] The bonding force between adjacent straight segments is proportional to the distance between the corresponding bonding position and the state sensor, and the bonding force is less than a preset structural bearing threshold.

[0012] Optionally, in the battery pack state detection circuit, the bending and winding segment is a circular arc segment.

[0013] The ratio of the radius of the circular arc segment to the outer diameter of the multi-bending and winding wire is not less than a preset arc stability threshold.

[0014] Optionally, in the battery pack state detection circuit, the bonding force ranges from 5N to 25N, inclusive.

[0015] Optionally, in the battery pack state detection circuit, the insulating outer cladding of the multi-bending and winding wire includes at least one of a cross-linked polyethylene layer, a polypropylene layer, and a polyvinyl chloride layer.

[0016] And / or

[0017] The conductive core of the multi-bending and winding wire includes at least one of a bare copper stranded conductor core, a tinned copper stranded conductor core, a bare copper single conductor core, and a tinned copper single conductor core.

[0018] Optionally, in the battery pack state detection circuit, the insulating outer cladding of adjacent straight segments is bonded to each other by being partially melted after heat treatment.

[0019] A production device of a battery pack state detection circuit, used for producing any one of the above-mentioned battery pack state detection circuits, includes a single-sided baffle, a chuck, a welding assembly, a fixed base plate, and a squeeze contact;

[0020] The fixed base plate includes a positioning and fixing member, a profiled pulling head, and a pulling track.

[0021] The positioning and fixing member is used for positioning and fixing a base material wire; and the chuck is used for fixing a state sensor.

[0022] The profiled pulling head is arranged in the pulling track and can reciprocate in the pulling track.

[0023] The starting positions of a plurality of profiled pulling heads are alternately arranged on both sides of the base material wire along the extension direction of the base material wire; the movement directions of adjacent profiled pulling heads starting from the starting positions are opposite, and the movement directions are both intersected with the base material wire; the profiled pulling head is moved to form a plurality of bending and winding segments.

[0024] The extrusion contact is used to press the base material wire from both sides of the single-sided baffle to form the curved bypass section, so that the wire section between the curved bypass sections forms a straight section that is in close contact and parallel to each other;

[0025] The welding assembly is used to weld one end of the base material wire with the state sensor.

[0026] Optionally, in the production equipment of the battery pack state detection circuit, a height limiting plate is further included, and the height limiting plate and the fixed base plate form a working cavity, and the base material wire is arranged in the working cavity.

[0027] The distance between the height limiting plate and the fixed base plate is consistent with the diameter of the base material wire.

[0028] Optionally, in the production equipment of the battery pack state detection circuit, all the pulling tracks are parallel to each other.

[0029] Optionally, in the production equipment of the battery pack state detection circuit, the clamp head is fixed to the edge of the fixed base plate, and the side surface of the clamp head is used as the single-sided baffle.

[0030] Optionally, in the production equipment of the battery pack state detection circuit, a hot pressing plate is further included.

[0031] The surface of the hot pressing plate includes a groove corresponding to the shape of the multi-bent folded wire, and is used for hot pressing and shaping the base material wire after being pulled and pressed.

[0032] The battery pack state detection circuit provided by the application includes a state sensor and a multi-bent folded wire; the state sensor is arranged on a monitored battery pack and is electrically connected with a signal transmission bus through the multi-bent folded wire; the multi-bent folded wire includes a plurality of curved bypass sections and straight sections; the curved bypass sections and the straight sections are arranged alternately on the multi-bent folded wire; the plurality of straight sections are parallel to each other, and the insulating outer cover layers of adjacent straight sections are bonded to each other; the bonding force between adjacent straight sections is proportional to the distance between the corresponding bonding position and the state sensor, and the bonding force is less than a preset structural bearing threshold.

[0033] The application provides a multiple-bending and folding wire, when a monitored battery pack is heated and expanded, adjacent straight sections in the multiple-bending and folding wire are disconnected due to bearing excessive force, which is equivalent to releasing additional wire length, avoiding the situation that the wire length is insufficient and the force is too large to break and disconnect, improving the working stability and service life of the battery pack state detection circuit, meanwhile, the farther the bonding position of the adjacent straight sections is from the signal transmission bus, the smaller the bonding force is, which ensures that the bonding between the straight sections close to the state sensor is disconnected first, so that the excessive pulling force is unloaded by the wire section close to the state sensor before being transmitted to the signal transmission bus, further ensuring the safety of the signal transmission bus and greatly reducing the maintenance and repair cost in the later period. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0035] Fig. 1 is a partial structure schematic diagram of one specific embodiment of the battery pack state detection circuit provided by the present application;

[0036] Fig. 2 is a partial structure schematic diagram of one specific embodiment of the battery pack state detection circuit provided by the present application;

[0037] Fig. 3 is a partial structure schematic diagram of one specific embodiment of the battery pack state detection circuit provided by the present application;

[0038] Fig. 4 is a partial structure schematic diagram of one specific embodiment of the production equipment of the battery pack state detection circuit provided by the present application;

[0039] Fig. 5 is a partial structure schematic diagram of one specific embodiment of the production equipment of the battery pack state detection circuit provided by the present application;

[0040] Fig. 6 is a partial structure schematic diagram of one specific embodiment of the production equipment of the battery pack state detection circuit provided by the present application.

[0041] In the figure, 10 is a multi-bend folded wire, 20 is a state sensor, 30 is a signal transmission bus, 40 is a monitored battery pack, 11 is a contact connection, 100 is a fixed base plate, 110 is a positioning fixing piece, 120 is a molded pulling head, 130 is a pulling track, 200 is a pressing contact, 300 is a base material wire, 400 is a chuck, 500 is a single-sided baffle, 01 is a first straight section, 02 is a second straight section, 03 is a third straight section, 04 is a fourth straight section, 01' is a first bending section, 02' is a second bending section, 03' is a third bending section, 04' is a fourth bending section, and 05' is a fifth bending section. DETAILED DESCRIPTION

[0042] In order to make the personnel in the technical field better understand the present application scheme, the present application is further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0043] The core of the present application is to provide a battery pack state detection circuit, and a structure schematic diagram of a specific embodiment thereof is shown in FIG. 1 and FIG. 2, which is referred to as specific embodiment one, comprising a state sensor 20 and a multi-bend folded wire 10.

[0044] The state sensor 20 is arranged on the monitored battery pack 40 and is electrically connected with the signal transmission bus 30 through the multi-bend folded wire 10.

[0045] The multi-bend folded wire 10 comprises a plurality of bending and winding sections and straight sections.

[0046] The bending and winding sections and the straight sections are alternately arranged on the multi-bend folded wire 10.

[0047] The plurality of straight sections are parallel to each other, and the insulating outer cladding layers of adjacent straight sections are bonded to each other.

[0048] The bonding force between adjacent straight sections is proportional to the distance between the corresponding bonding position and the state sensor 20, and the bonding force is less than a preset structural bearing threshold.

[0049] Fig. 1 and Fig. 2 are schematic diagrams of the multi-bend folded wire 10 before and after being pulled apart by external force, respectively, the multi-bend folded wire 10 can be regarded as a wire obtained by repeatedly folding and bonding the base material wire 300, the multi-bend folded wire 10 itself is composed of a conductive core and an insulating outer coating wrapped outside the conductive core, for details, please refer to Fig. 1 and Fig. 2, in the figures, the contact connection between the conductive core of the multi-bend folded wire 10 and the signal transmission bus 30 is marked as 11. Preferably, the outer surface of the multi-bend folded wire 10 also includes an electrically insulating coating, further improving the electrical performance of the multi-bend folded wire 10.

[0050] Of course, the state sensor 20 needs to be connected to the positive and negative electrodes respectively, therefore, the multi-bend folded wire 10 includes a positive signal line and a negative signal line, which is also shown in Fig. 1 and Fig. 2, that is, a line and b line. The state sensor 20 can include at least one of a temperature sensor, a light sensor, a current sensor, a humidity sensor, and an air sensor. Of course, other types of state sensors 20 can also be selected according to actual conditions, which are not limited by the present application.

[0051] The multi-bend folded wire 10 is stable in structure and not easy to deform, and when subjected to a certain tension, it will undergo a degumming extension, and the bending and winding section has a certain rebound function after being stretched, avoiding wire breakage and poor contact caused by thermal expansion and contraction of the battery pack.

[0052] The structure bearing threshold is a preset tension threshold, and when the structure in the circuit exceeds the structure bearing threshold, the structure may be damaged due to bearing excessive tension. It should be noted that the above-mentioned possible damaged structure includes not only the state sensor 20 and the multi-bend folded wire 10, but also the signal transmission bus 30. The battery pack state detection circuit provided by the present application is a whole when it leaves the factory. The multi-bend folded wire 10 is rigid when it is not subjected to external force, and the shape is regular, which greatly facilitates the transportation and installation of the battery pack state detection circuit. For example, the size of the entire battery pack state detection circuit is less than the space occupation of 16mm in width*36mm in length*1mm in thickness.

[0053] Preferably, the bonding force ranges from 5N to 25N, including the end values, such as any one of 5.0N, 13.1N or 25.0N. The above range is the best range after a large number of theoretical calculations and actual tests. In the above range, neither will the multi-bend folded wire 10 be scattered during transportation due to the bonding force being too small, resulting in difficulty in installation, nor will the multi-bend folded wire 10 not be able to scatter in time when the monitored battery pack 40 expands due to the bonding force being too large. Of course, other values of the bonding force can also be selected according to actual conditions, which are not limited by the present application.

[0054] The present application adopts the means that the adhesion is smaller closer to the state sensor 20, forms the effect of layer-by-layer unloading, and guarantees that the signal transmission bus 30 which is difficult to maintain and high in cost is not damaged to the maximum extent.

[0055] Preferably, the insulating outer layer of the multi-bend folded wire 10 comprises at least one of a cross-linked polyethylene layer, a polypropylene layer and a polyvinyl chloride layer.

[0056] And / or

[0057] The conductive core of the multi-bend folded wire 10 comprises at least one of a bare copper stranded conductor core, a tinned copper stranded conductor core, a bare copper single conductor core and a tinned copper single conductor core.

[0058] Since the multi-bend folded wire 10 needs to be repeatedly bent and extruded in the manufacturing process, it is preferred to use the above-mentioned soft and high-elasticity, bend-resistant metal material as the conductive core, which improves the bending performance and resilience of the wire and ensures that it will not be broken or damaged during the manufacturing process. Similarly, the surface of the conductive core is coated with the above-mentioned insulating material which is soft in texture, high in elasticity, bend-resistant and suitable for use in an environment of 105 to 125 degrees Celsius, which ensures the electrical performance and safety of the wire.

[0059] As a preferred embodiment, the bending detour section is a circular arc section.

[0060] The ratio of the radius of curvature of the circular arc section to the outer diameter of the multi-bend folded wire 10 is not less than a preset arc stability threshold.

[0061] In the preferred embodiment, the bending detour section is a circular arc section, that is, the multi-bend folded wire 10 is bent into a circular arc shape at the bending detour section, and the ratio of the radius of curvature of the circular arc section to the outer diameter of the multi-bend folded wire 10 is specified. The preset arc stability threshold can be 2, of course, it can also be adjusted according to the actual situation. Through the above-mentioned means, the bending performance and resilience of the wire are improved, and the ability of the wire to resist external force is also improved, greatly reducing the possibility of the multi-bend folded wire 10 being broken at the bending detour section, improving the working stability of the multi-bend folded wire 10, and reducing the loss caused by bumps during transportation.

[0062] The state sensor 20 can be a thermistor, which is popular due to its high precision characteristics, and can be used to measure the temperature of the monitored battery pack 40 in real time.

[0063] The signal transmission bus 30 can adopt FPC (Flexible Printed Circuit) or HFC (new type of flexible wire harness), which is not limited in the present application.

[0064] The battery pack state detection circuit provided by the application comprises a state sensor 20 and a multi-bend folding wire 10; the state sensor 20 is arranged on a monitored battery pack 40 and is electrically connected with a signal transmission bus 30 through the multi-bend folding wire 10; the multi-bend folding wire 10 comprises a plurality of bend and circuitous segments and straight segments; the bend and circuitous segments and the straight segments are alternately arranged on the multi-bend folding wire 10; the plurality of straight segments are parallel to each other, and the insulating outer cladding layers of adjacent straight segments are bonded to each other; the bonding force between adjacent straight segments is proportional to the distance between the corresponding bonding position and the state sensor 20, and the bonding force is smaller than a preset structural force threshold. The application provides a multi-bend and folding wire. When the monitored battery pack 40 is heated and expanded, the adjacent straight segments in the multi-bend folding wire 10 are disconnected due to bearing excessive force, which is equivalent to releasing additional wire length, thereby avoiding the situation that the wire length is insufficient and the force is too large to cause the wire to break or disconnect, improving the working stability and service life of the battery pack state detection circuit. Meanwhile, the farther the bonding position of the adjacent straight segments is from the signal transmission bus 30, the smaller the corresponding bonding force is, which ensures that the bonding between the straight segments close to the state sensor 20 is disconnected first, so that the excessive force is unloaded by the wire segment close to the state sensor 20 before being transmitted to the signal transmission bus 30, further ensuring the safety of the signal transmission bus 30 and greatly reducing the maintenance and repair cost in the later period.

[0065] On the basis of the first embodiment, the bonding mode of the straight segments is further limited to obtain the second embodiment, and the corresponding structural schematic diagram is the same as that of the above-mentioned first embodiment, which comprises a state sensor 20 and a multi-bend folding wire 10.

[0066] The state sensor 20 is arranged on the monitored battery pack 40 and is electrically connected with the signal transmission bus 30 through the multi-bend folding wire 10.

[0067] The multi-bend folding wire 10 comprises a plurality of bend and circuitous segments and straight segments.

[0068] The bend and circuitous segments and the straight segments are alternately arranged on the multi-bend folding wire 10.

[0069] The plurality of straight segments are parallel to each other, and the insulating outer cladding layers of adjacent straight segments are bonded to each other.

[0070] The bonding force between adjacent straight segments is proportional to the distance between the corresponding bonding position and the state sensor 20, and the bonding force is smaller than a preset structural force threshold.

[0071] The insulating outer cladding layers of the adjacent straight segments are partially melted and bonded to each other through heat treatment.

[0072] The difference between the present embodiment and the above-mentioned embodiment is that the present embodiment further defines the bonding method of the adjacent straight line segments, and the rest of the structure is the same as the above-mentioned embodiment, which will not be described here.

[0073] In the present embodiment, the bonding between the adjacent straight line segments is formed by melting the heat-treated insulating outer layer, without the need for additional adhesive, simplifying the structure and process, reducing production costs and improving production efficiency. At the same time, the heat treatment can have a better shaping effect on the multi-bend folded wire 10, so that the wire shape remains preset, facilitating the standardization of the process in subsequent mass production.

[0074] Of course, the bonding between the adjacent straight line segments can also be achieved by dispensing or other methods, which can be adjusted according to the actual situation, and the present application is not limited in this regard.

[0075] The following gives a specific embodiment of the battery pack state detection circuit provided by the present application applied to a new energy vehicle, i.e. a new energy vehicle temperature detection device and its wire, please see FIG. 3 for details, which comprises an NTC thermistor, two positive and negative signal lines connected to each other at the middle position on one side of the NTC thermistor, of course, the positive and negative signal lines together constitute the multi-bend folded wire 10, the multi-bend folded wire 10 comprises an a signal line and a b signal line, both of which are composed of an internal conductor and an external insulating material, the cross-sectional area of the internal conductor is circular, composed of a plurality of tinned soft copper strands, the single wire diameter is 0.07 mm, the cross-sectional area of the twisted strands is 0.152 mm2, the minimum value is 0.152 mm, the maximum value is 0.156 mm, the average value is 0.154 mm, the lay is 8-10 mm, and the lay is left.

[0076] The external insulating material is wrapped, the material is PVC, the outer diameter is 0.95±0.05 mm, and the cross-sectional area is 0.2-0.25 mm 2 , the concentricity is >45%, preferably the PVC material meeting the T3 standard in ISO 19642, suitable for use at a temperature of 105-125 degrees.

[0077] One end of the wire is welded to the middle of one side of the NTC thermistor, and the other end of the wire is welded to the HFC data line of the new energy vehicle (i.e. the signal transmission bus 30), the diameter of the wire is 1 mm, because the installation space is limited, the thickness or total height of the data line must be below 1.2 mm, therefore the wires cannot overlap each other, otherwise the height will exceed this value. The a signal line and the b signal line are arranged in a multiple S shape, distributed in a space with a length of 36 mm, a width of 16 mm, and a height of 1 mm.

[0078] The wire includes a first bending part 01', a second bending part 02', a third bending part 03', a fourth bending part 04', and a fifth bending part 05'. The first bending part 01' has a bending angle of 90 degrees, the second bending part 02' has a bending angle of 180 degrees, the third bending part 03' has a bending angle of 180 degrees, the fourth bending part 04' has a bending angle of 180 degrees, and the fifth bending part 05' has different bending angles due to the separation of the a signal line and the b signal line, wherein the a signal line has a bending angle of 180 degrees, and the b signal line has a bending angle of 20 degrees.

[0079] When the wire is in the first bending part 01', the a signal line of the wire is inside the b signal line, when the wire is in the second bending part 02', the b signal line of the wire is inside the a signal line, when the wire is in the third bending part 03', the a signal line of the wire is inside the b signal line, when the wire is in the fourth bending part 04', the b signal line of the wire is inside the a signal line, and when the wire is in the fifth bending part 05', the b signal line and the a signal line of the wire are separated from each other and are bent in different directions according to the needs of the contact points. When the wire is in the fifth bending part 05', the end conductor of the wire is exposed from the insulating layer. The end position of the wire is higher than the fifth bending part 05'.

[0080] The wire further includes a first straight part 01, a second straight part 02, a third straight part 03, and a fourth straight part 04. The first straight part 01 is between the first bending part 01' and the second bending part 02', the second straight part 02 is between the second bending part 02' and the third bending part 03', the third straight part 03 is between the third bending part 03' and the fourth bending part 04', and the fourth straight part 04 is between the fourth bending part 04' and the fifth bending part 05'.

[0081] The first straight part 01 and the second straight part 02 are weakly adhered by means of mold heating or glue dropping; the second straight part 02 and the third straight part 03 are weakly adhered by means of mold heating or glue dropping; the third straight part 03 and the fourth straight part 04 are strongly adhered by means of mold heating or glue dropping; the degree of weak adhesion gradually increases from the bottom to the top of the ntc thermistor, until the top layer is strongly adhered, and the maximum tensile force that each layer can withstand is 5N, 10N, and 25N respectively, so as to ensure that the upper end of the wire and the hfc data line of the new energy vehicle are basically not affected by the tensile force generated by the thermal expansion and contraction of the battery cell. (After the wire is pulled apart by the first two layers in weak adhesion, it is removed), so as to protect the hfc data line of the new energy vehicle from being damaged by pulling.

[0082] Each bending part is further provided with a detour arc, the radian of each detour arc is greater than 2 times the outer diameter of a single wire, so as to improve the bending performance and resilience of the wire. The radius of the detour arc of the first bending part 01' is 2.2 mm, the radius of the detour arc of the second bending part 02' is 3 mm, and the radius of the detour arc of the third bending part 03' is 2.2 mm. The bending parts of each upper and lower layer are arranged staggered, so as to maximize the use of limited space, and the wires in each layer will not be interlaced and stacked, and finally the whole wire is kept in a space with a width*length*thickness of 16*36*1.0 mm.

[0083] The application also provides a production equipment of a battery pack state detection circuit, a partial structure schematic diagram of a specific embodiment of which is shown in Figures 4 to 5, referred to as specific embodiment three, for producing the battery pack state detection circuit as described in any of the above, comprising a single-sided baffle 500, a chuck 400, a welding assembly, a fixed base plate 100 and a squeeze contact 200.

[0084] The fixed base plate 100 comprises a positioning fixing member 110, a profiled pulling head 120 and a pulling track 130.

[0085] The positioning fixing member 110 is used for positioning and fixing the base material wire 300, and the chuck 400 is used for fixing the state sensor 20.

[0086] The profiled pulling head 120 is arranged in the pulling track 130 and can reciprocate in the pulling track 130.

[0087] The starting positions of a plurality of profiled pulling heads 120 are alternately arranged on both sides of the base material wire 300 along the extension direction of the base material wire 300; the movement directions of adjacent profiled pulling heads 120 starting from the starting positions are opposite, and the movement directions are both intersected with the base material wire 300; the profiled pulling head 120 drives the base material wire 300 to form a plurality of bending detour sections.

[0088] The squeeze contact 200 is used for pressing the base material wire 300 forming the bending detour sections from both sides of the single-sided baffle 500, so as to form straight sections that are mutually adhered and parallel between the wire sections between the bending detour sections.

[0089] The welding assembly is used for welding one end of the base material wire 300 with the state sensor 20.

[0090] As a preferred embodiment, a height limiting plate is further included, and the height limiting plate and the fixed base plate 100 form a working cavity, and the base material wire 300 is arranged in the working cavity.

[0091] The distance between the height-limiting plate and the fixed substrate 100 is consistent with the diameter of the substrate wire 300.

[0092] In the specific embodiment, the thickness of the working cavity, i.e. the distance between the height-limiting plate and the fixed substrate 100, is consistent with the diameter of the substrate wire 300, i.e. the substrate wire 300 is clamped by the fixed substrate 100 and the height-limiting plate, and when the substrate wire 300 is pressed, the extrusion contact 200 needs to be inserted into the working cavity to ensure that the substrate wire 300 is always in the same plane during compaction, avoiding the situation that different straight segments are distributed in different planes and subsequent processing is difficult to develop. Of course, the distance between the height-limiting plate and the fixed substrate 100 consistent with the diameter of the substrate wire 300 means that the two can be exactly the same, or there can be some error, and the specific value of the error can be selected according to the actual situation.

[0093] Further, all the pulling tracks 130 are parallel to each other. Please refer to FIG. 4, all the pulling tracks 130 in FIG. 4 are parallel to each other, which facilitates the subsequent extrusion of the extrusion contact 200 on the substrate wire 300, and improves the production efficiency. In addition, FIG. 4 is a structure schematic view of the substrate wire 300 being positioned and fixed, and the plastic pulling head 120 is located at the starting position. FIG. 5 is a structure schematic view of the plastic pulling head 120 starting to move along the pulling track 130 and pulling the substrate wire 300.

[0094] Further, the clamp head 400 is fixed to the edge of the fixed substrate 100, and the side surface of the clamp head 400 is used as the single-sided baffle 500.

[0095] Please refer to FIG. 6, which shows that the clamp head 400 is directly attached to the edge of the fixed substrate 100, and the side surface in the thickness direction of the clamp head 400 can directly serve as the single-sided baffle 500 opposite to the extrusion contact 200, assisting in the pressing of the substrate wire 300 during the pressing of the extrusion contact 200 on the substrate wire 300, thereby simplifying the structure of the production equipment of the battery pack state detection circuit and reducing the equipment cost.

[0096] As another preferred embodiment, a hot press plate is further included;

[0097] The surface of the hot press plate includes grooves corresponding to the shape of the multi-bending folded wire 10, for hot pressing and shaping the substrate wire 300 after being pulled and pressed.

[0098] The state sensor 20 is connected to the signal transmission bus 30 through the multi-bend folded wire 10 and transmits signals to the signal transmission bus 30. In individual application scenarios such as new energy vehicles, there is a certain gap between the signal transmission bus 30 and the battery pack of the vehicle. The wire or metal sheet is arranged at this position. The space at this position is extremely limited. Reasonable layout is required to not affect other components.

[0099] Therefore, in the present embodiment, the base material wire 300 (i.e., the multi-bend folded wire 10 in the foregoing) subjected to pulling and pressing is further heat-pressed and shaped by the heat press plate. On the one hand, the shape of the wire is kept regular, facilitating standardized mass production in subsequent processes. On the other hand, the multi-bend folded wire 10 is strictly shaped into a planar plate structure by heat pressing, facilitating embedding of the battery pack state detection circuit into the gap around the battery pack during installation, and reducing installation difficulty. Of course, if the adhesion between adjacent straight sections of the multi-bend folded wire 10 needs to be achieved by heat treatment, it can also be completed synchronously in the heat pressing process.

[0100] The production equipment of the battery pack state detection circuit provided by the present application comprises a single-sided baffle 500, a chuck 400, a welding assembly, a fixed substrate 100, and an extrusion contact 200. The fixed substrate 100 comprises a positioning fixing member 110, a profiled pulling head 120, and a pulling track 130. The positioning fixing member 110 is used for positioning and fixing the base material wire 300. The chuck 400 is used for fixing the state sensor 20. The profiled pulling head 120 is arranged in the pulling track 130 and can reciprocate in the pulling track 130. The starting positions of a plurality of profiled pulling heads 120 are alternately arranged on both sides of the base material wire 300 along the extension direction of the base material wire 300. The movement directions of adjacent profiled pulling heads 120 starting from the starting positions are opposite, and the movement directions are both intersected with the base material wire 300. The profiled pulling head 120 drives the base material wire 300 to form a plurality of bent and winding sections. The extrusion contact 200 is used for pressing the base material wire 300 forming the bent and winding sections from both sides of the single-sided baffle 500, so that the wire sections between the bent and winding sections are formed into mutually adhering and parallel straight sections. The welding assembly is used for welding one end of the base material wire 300 with the state sensor 20. The production equipment of the battery pack state detection circuit can quickly pull the base material wire 300 to a shape close to a predetermined shape by the profiled pulling head 120 on the fixed substrate 100, and further compact and adhere by the extrusion contact 200, so as to obtain the multi-bend folded wire 10. The production speed of the multi-bend folded wire 10 is improved, and the standardization degree of the multi-bend folded wire 10 is greatly improved, providing a basis for subsequent mass production.

[0101] The various embodiments described in this specification are presented by way of example, and embodiments disclosed herein are not intended to limit the scope of the application disclosed herein. Any and all embodiments of the application described herein can be implemented in various ways, and the application should not be construed as being limited to the embodiments described herein, unless the application is so limited by the claims.

[0102] It should be noted that, in this specification, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual such relationship or order between such entities or operations. Also, the terms "comprises", "comprising", or any other variations thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0103] The above describes in detail the battery pack state detection circuit and its production equipment provided by the application. The principles and implementation manners of the application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the method of the application and its core idea. It should be pointed out that, for ordinary skilled persons in the art, without departing from the principles of the application, the application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A battery pack state detection circuit, characterized by, The state sensor and the multi-bend folded conductor wire are included; The state sensor is arranged on the monitored battery pack and is electrically connected with the signal transmission bus through the multi-bend folded conductor wire; The multi-bend folded conductor wire includes a plurality of bend and detour segments and straight segments; The bend and detour segments and the straight segments are alternately arranged on the multi-bend folded conductor wire; The plurality of straight segments are parallel to each other, and the insulating outer cladding of adjacent straight segments is bonded to each other; The bonding force between adjacent straight segments is proportional to the distance from the corresponding bonding position to the state sensor, and the bonding force is less than a preset structural bearing threshold.

2. The battery pack state detection circuit of claim 1, wherein, The bend and detour segment is a circular arc segment; The ratio of the radius of the circular arc segment to the outer diameter of the multi-bend folded conductor wire is not less than a preset arc stability threshold.

3. The battery pack state detection circuit of claim 1, wherein, The range of the bonding force is 5N to 25N, including the end point values.

4. The battery pack state detection circuit of claim 1, wherein, The insulating outer cladding of the multi-bend folded conductor wire includes at least one of a cross-linked polyethylene layer, a polypropylene layer and a polyvinyl chloride layer; And / or The conductive core of the multi-bend folded conductor wire includes at least one of a bare copper stranded conductor core, a tinned copper stranded conductor core, a bare copper single conductor core and a tinned copper single conductor core.

5. The battery pack state detection circuit according to any one of claims 1 to 4, characterized by, The insulating outer cladding of adjacent straight segments is bonded to each other after heat treatment and partial melting.

6. A production apparatus of a battery pack state detection circuit, characterized by comprising: A battery pack state detection circuit as claimed in any one of claims 1 to 5 is produced, including a single-sided baffle, a clamp, a welding assembly, a fixed base plate and an extrusion contact; The fixed base plate includes a positioning fixing member, a profiled pulling head and a pulling track; The positioning fixing member is used for positioning and fixing the base material conductor wire; and the clamp is used for fixing the state sensor; The profiled pulling head is arranged in the pulling track and can reciprocate in the pulling track; The starting positions of a plurality of profiled pulling heads are alternately arranged on both sides of the base material conductor wire along the extension direction of the base material conductor wire; the movement directions of adjacent profiled pulling heads starting from the starting positions are opposite, and the movement directions are both intersected with the base material conductor wire; the profiled pulling head movement drives the base material conductor wire to form a plurality of bend and detour segments; The extrusion contact is used for pressing the base material conductor wire forming the bend and detour segments from both sides of the single-sided baffle, so that the conductor wire segments between the bend and detour segments form mutually adhered and parallel straight segments; The welding assembly is used for welding one end of the base material conductor wire and the state sensor.

7. The battery pack state detection circuit production apparatus according to claim 6, wherein A height limiting plate is further included, and the height limiting plate and the fixed base plate form a working cavity, and the base material conductor wire is arranged in the working cavity; The distance between the height limiting plate and the fixed base plate is consistent with the diameter of the base material conductor wire.

8. The production apparatus for a battery pack state detection circuit according to claim 6, wherein All the pulling tracks are parallel to each other.

9. The battery pack state detection circuit production apparatus according to claim 6, wherein The clamp is fixed to the edge of the fixed base plate, and the side surface of the clamp is used as the single-sided baffle.

10. The battery pack state detection circuit production apparatus according to any one of claims 6 to 9, wherein A hot pressing plate is further included; The surface of the hot pressing plate includes a groove corresponding to the shape of the multi-bend folded conductor wire, which is used for hot pressing and shaping the base material conductor wire after pulling and pressing.

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