Sampling assembly, energy storage apparatus, and energy storage system

Abstract

The present application relates to the technical field of energy storage, and discloses a sampling assembly, an energy storage apparatus, and an energy storage system. The sampling assembly comprises: a flexible substrate, provided with isolation slots and connecting bridges, wherein the flexible substrate is divided into a body plate and fixing portions, and the connecting bridges connect the fixing portions and the body plate; a plurality of sampling wires, laid on the flexible substrate, wherein the line width of a first wire is greater than that of a second wire, and the first wire is located on the side of the second wire close to a side edge of the flexible substrate; and sampling terminals, connected to the sampling wires of the fixing portions. In the embodiments of the present application, the flexible substrate replaces connecting wires, thereby facilitating simplification of the connection between battery cells and a battery management system, and improving electrical safety. In addition, the isolation slots on the flexible substrate provide a certain buffering space between the fixing portions and the body plate, so that when the fixing portions are pulled due to thermal expansion of battery cells, tearing between the fixing portions and the body plate is avoided, thereby ensuring effective collection of operating parameters of the battery cells.

Description

Sampling assembly, energy storage device and energy storage system

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to the Chinese patent application No. 202421948069.2 filed on August 12, 2024, entitled “Sampling assembly, energy storage device and energy storage system”, the entire contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of energy storage, in particular to a sampling assembly, an energy storage device and an energy storage system. BACKGROUND

[0004] The existing energy storage device currently comprises a battery module, and the working condition parameters of each battery monomer included in the battery module are transmitted to a battery management system (BMS) through a wiring collection mode. Specifically, one end of a connection wire is connected to an interface end of the battery management system, and the other end is connected to the battery monomer to collect the working condition parameters of the battery monomer. However, under the trend of pursuing high energy density, the number of battery monomers included in the energy storage device is increasing, and the wiring collection mode described above requires a large number of connection wires, thereby occupying too much internal space of the battery pack, and the efficiency of manually collecting and arranging the connection wires is low, which is not conducive to automated mass production, and this has become a key factor affecting the production cost of the energy storage device. SUMMARY

[0005] One main purpose of the present application is to provide a sampling assembly, an energy storage device and an energy storage system.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] According to one aspect of the present application, a sampling assembly for an energy storage device is provided, comprising: a flexible substrate having a through isolation slit and a connecting bridge, the isolation slit having a first end portion and a second end portion, the first end portion and the edge of the flexible substrate forming a connecting portion, the second end portion extending to the same side edge of the flexible substrate, the isolation slit and the connecting portion separating the flexible substrate into a body plate and a fixed portion, and the connecting bridge connecting the fixed portion and the body plate; a plurality of sampling wires laid on the flexible substrate and each extending from the body plate to the fixed portion, the plurality of sampling wires including a first wire and a second wire, the line width of the first wire being greater than the line width of the second wire, and the first wire being located on one side of the second wire close to the side edge of the flexible substrate; and a sampling terminal connected to the first wire and the second wire extending to the fixed portion.

[0008] In the embodiment of the present application, the sampling group is provided with sampling lines laid on the flexible substrate, thereby avoiding the arrangement of connecting wires, and further avoiding the situation that too many connecting wires cause the wires to be complicated, so as to facilitate the simplification of the connection between the battery monomer and the battery management system, and improve the power utilization safety of the energy storage device. In addition, the through isolation slot is arranged on the flexible substrate, so that the fixing part has a certain buffer space relative to the body plate, thereby avoiding the tearing of the fixing part and the body plate when the fixing part is pulled by the sampling terminal after the thermal expansion of the battery monomer, and ensuring the effective collection of the working condition parameters of the battery monomer. Furthermore, the arrangement of the plurality of sampling lines can realize the collection of a plurality of working condition parameters, and the first line with a relatively large line width is arranged on the side close to the side edge of the flexible substrate, so as to ensure the structural strength of the connecting part, thereby ensuring the connection stability of the fixing part and the body plate.

[0009] According to an aspect of the present application, an energy storage device is provided, comprising: a battery module comprising a plurality of battery monomers and a plurality of busbars, each of the busbars being connected to at least two electrode terminals of different polarities of the battery monomers; and the sampling assembly according to the above aspect, the sampling assembly comprising a plurality of the sampling terminals, each of the sampling terminals being connected to one of the busbars.

[0010] According to an aspect of the present application, an energy storage system is provided, comprising the energy storage device according to the above aspect.

[0011] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0012] The above and other features and advantages of the present application will become more apparent from the following detailed description of exemplary embodiments thereof, with reference to the accompanying drawings.

[0013] FIG. 1 is a structural schematic diagram of an energy storage system according to an exemplary embodiment.

[0014] FIG. 2 is a structural schematic diagram of an energy storage device according to an exemplary embodiment.

[0015] FIG. 3 is a structural schematic diagram of another energy storage device according to an exemplary embodiment.

[0016] FIG. 4 is a structural schematic diagram of a sampling assembly according to an exemplary embodiment.

[0017] FIG. 5 is a partial enlarged structural schematic diagram of the sampling assembly shown in FIG. 4.

[0018] Wherein, the reference signs are explained as follows: 100, energy storage device; 200, electric energy conversion device; 300, user load; 10, battery box; 20, battery module; 30, sampling assembly; 40, battery management system; 50, wire harness; 11, lower box; 12, box cover; 21, battery monomer; 22, busbar; 23, isolation plate; 24, fixed end plate; 25, cable tie; 31, flexible substrate; 32, sampling wire; 33, sampling terminal; 34, connection terminal; 311, body plate; 312, fixed part; 313, isolation slot; 314, first end part; 315, second end part; 316, connection part; 317, connection bridge; 321, first wire; 322, second wire; 323, fuse; 324, first reinforcing wire; 325, second reinforcing wire; 326, third reinforcing wire; 327, fourth reinforcing wire; 328, grid-shaped wire; 329, ring-shaped wire. DETAILED DESCRIPTION

[0019] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, these embodiments can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the drawings, and thus a detailed description of them will not be repeated.

[0020] Since the energy required by people has strong time and space, in order to reasonably use energy and improve utilization, it is necessary to store one energy form into the same energy form or convert into another energy form through a medium or device, and then release it in a specific energy form based on future application.

[0021] At present, green energy mainly includes light energy, wind energy, etc., and light energy and wind energy have the problems of strong intermittency and large fluctuation, which will cause the voltage instability of green power grid (not enough electricity at peak electricity consumption, and too much electricity at low electricity consumption), and the unstable voltage will cause damage to electricity, so the problem of "abandoning wind and light" may be caused by insufficient electricity demand or insufficient grid receiving capacity.

[0022] In order to solve the problem of insufficient electricity demand or insufficient grid receiving capacity, it is necessary to rely on energy storage device. That is, through the energy storage device, the electric energy is converted into other forms of energy by physical or chemical means, and the energy stored in the energy storage device is converted into electric energy when needed. In short, the energy storage device is similar to a large "power bank", which stores electric energy when light energy and wind energy are sufficient, and releases the stored electric energy when needed.

[0023] Current energy storage applications are widely used, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage. The corresponding energy storage devices include:

[0024] (1) Large energy storage containers used in power grid side energy storage scenarios, which can be used as high-quality active and reactive power regulation power sources in the power grid, to realize load matching in time and space, enhance renewable energy consumption capacity, and have great significance in power grid system backup, relieving peak load power supply pressure and peak regulation.

[0025] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in household energy storage scenarios, the main operation mode is "peak clipping and valley filling". Due to the large price difference between peak and valley electricity prices, users usually charge the energy storage device during the low valley period to reduce costs. During the peak period, the electricity in the energy storage device is discharged for use to achieve the purpose of saving electricity costs. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to providing backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0026] The present application provides an energy storage system, which includes an energy storage device to store or supply electricity.

[0027] Taking the outdoor energy storage scenario in the power grid side energy storage as an example, FIG. 1 illustrates a schematic diagram of an energy storage system provided by the present application, which includes an energy storage device 100, an energy conversion device 200, and a user load 300. The energy conversion device 200 (including a solar energy conversion device, a wind energy conversion device) is electrically connected to the energy storage device 100, and the energy storage device 100 is electrically connected to the user load 300. In this way, solar energy, wind energy, and other forms of energy can be converted into electricity by the energy conversion device 200, and stored by the energy storage device 100. Then, the electricity can be supplied to the user load 300 for use during the peak period or when the power grid is disconnected / power is off.

[0028] The energy storage device 100 can be a battery module 20, a battery pack, a battery box, a battery system, etc. composed of battery monomers 21. The battery monomer 21 can be a lithium ion battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, etc., and can be in the form of a cylinder, a flat body, a cuboid, etc. The present application does not limit this. Specifically, the battery monomer 21 can use the chemical reaction or change of the energy storage medium (chemical element) to realize the charging and discharging process. In simple terms, the electrical energy generated by light energy and wind energy is stored in the battery monomer 21 through the chemical reaction or change of the energy storage medium, and when the use of external electrical energy reaches a peak, the electrical energy stored in the battery monomer 21 is released and used through the chemical reaction or change of the energy storage medium, or is transferred and used.

[0029] Next, the energy storage device 100 including the battery module 20 is taken as an example to explain the energy storage device 100 in detail.

[0030] FIG. 2 illustrates a structural schematic diagram of an energy storage device 100 according to an embodiment of the present application. As shown in FIG. 2, the energy storage device 100 includes a battery module 20 and a sampling assembly 30. The battery module 20 includes a plurality of battery monomers 21 and a plurality of busbars 22, each busbar 22 connecting at least two electrode terminals of different polarities of the battery monomers 21. The sampling assembly 30 includes a flexible substrate 31 having sampling traces 32 (not shown in the figure), a plurality of sampling terminals 33 (such as nickel sheets) connected to the flexible substrate 31, and a connection terminal 34 disposed at an end of the flexible substrate 31. The sampling traces 32 connect the sampling terminals 33 and the connection terminal 34. Each sampling terminal 33 is connected to one busbar 22 of the battery module 20. The connection terminal 34 is used to connect to a battery management system 40.

[0031] In this way, the working condition parameters of the monomer batteries connected by the busbar 22 can be collected through the sampling terminal 33 and then transmitted to the battery management system 40, thereby realizing the monitoring of the plurality of battery monomers 21. In addition, through the flexible substrate 31 included in the sampling assembly 30, the complexity of the collection harness 50 is avoided, thereby facilitating the simplification of the connection between the battery monomers 21 and the battery management system 40, and improving the electrical safety of the energy storage device 100.

[0032] Each battery monomer 21 has positive and negative electrode terminals. The plurality of battery monomers 21 can be connected in series or in series-parallel combination. For the connection in series, each busbar 22 is connected to the electrode terminals of two battery monomers 21 with different polarities, so as to realize the series connection of the plurality of battery monomers 21. For the connection in series-parallel combination, each busbar 22 is connected to the electrode terminals of two groups of battery monomers 21, the electrode terminals of each group of battery monomers 21 have the same polarity, and the electrode terminals of different groups of battery monomers 21 have different polarities, so as to realize the series-parallel combination of the plurality of battery monomers 21. For example, each busbar 22 is connected to the electrode terminals of two pairs of battery monomers 21, the electrode terminals of each pair of battery monomers 21 have the same polarity, and the electrode terminals of the two pairs of battery monomers 21 have different polarities, so as to realize the series connection of the two pairs of battery monomers 21 connected in parallel.

[0033] The flexible substrate 31 can be a flexible insulating plate to realize the insulation between the sampling wires 32. The flexible substrate 31 is provided with positioning holes, so that when the sampling wires 32 are laid on the flexible substrate 31, the flexible substrate 31 can be fixed through the positioning holes, while ensuring the accuracy of the position of the sampling wires 32, thereby improving the production yield.

[0034] In addition, as shown in FIG. 2, the battery module 20 further includes an isolation plate 23, the isolation plate 23 is located at the top of the battery module 20, and the sampling assembly 30 and the plurality of busbars 22 included in the battery module 20 are located at the top of the isolation plate 23 and are limited on the isolation plate 23, so as to avoid the contact between the sampling assembly 30 and the battery monomers 21 and reduce the contact between the busbars 22 and the battery monomers 21.

[0035] The isolation plate 23 can be a plate-shaped structure made of an insulating material such as a plastic plate, and the isolation plate 23 has a first limiting groove facing away from the battery monomers 21 and a plurality of second limiting grooves. The first limiting groove has a strip-shaped structure, the flexible substrate 31 included in the sampling assembly 30 is limited in the first limiting groove on the isolation plate 23, and each busbar 22 is limited in one second limiting groove on the isolation plate 23, so as to realize the limiting of the sampling assembly 30 and the plurality of busbars 22 on the isolation plate 23 and avoid the shaking of the sampling assembly 30 and the busbars 22.

[0036] In some embodiments, as shown in FIG. 2, the battery module 20 includes a pair of fixed end plates 24 arranged oppositely, and the plurality of battery monomers 21 are fixed between the pair of fixed end plates 24. The plurality of battery monomers 21 and the pair of fixed end plates 24 can be fixed by a binding tool such as a cable tie 25.

[0037] Of course, in addition to being fixed by the pair of fixed end plates 24, the plurality of battery monomers 21 can also be fixed by a fixing frame, and the embodiments of the present application do not limit this.

[0038] In some embodiments, as shown in FIG. 3, the energy storage device 100 further includes a battery box 10, the battery box 10 including a lower box 11 and a box cover 12, the box cover 12 being fixedly connected with the lower box 11 to enclose a battery compartment; the battery module 20 is located in the battery compartment of the battery box 10.

[0039] Among them, the battery module 20 contained in the battery compartment of the battery box 10 can be 2, 4, 6, 8, etc., and the more the number of battery modules 20, the higher the capacity of the energy storage device 100, thereby more easily meeting the market demand. For example, as shown in FIG. 3, the battery compartment of the battery box 10 contains 2 rows along the length direction of the battery box 10 (i.e. the length direction X of the flexible substrate 31), and 4 columns of battery modules 20 along the width direction of the battery box 10 (i.e. the width direction Y of the flexible substrate 31), that is, the battery compartment contains 8 battery modules 20.

[0040] In addition, as shown in FIG. 3, the energy storage device 100 further includes a battery management system 40, the battery management system 40 being connected with the sampling assembly 30 corresponding to the battery module 20 through a wire harness 50 to obtain the working condition parameters of each battery monomer 21.

[0041] In the embodiments of the present application, for the flexible substrate 31 included in the sampling assembly 30, as shown in FIGS. 4 and 5, the flexible substrate 31 has an isolation slot 313 disposed therethrough, the isolation slot 313 having a first end portion 314 and a second end portion 315, the first end portion 314 and the edge of the flexible substrate 31 forming a connecting portion 316, the second end portion 315 extending to the same side edge of the flexible substrate 31, the isolation slot 313 and the connecting portion 316 separating the flexible substrate 31 into a body plate 311 and a fixed portion 312; the sampling trace 32 is laid on the flexible substrate 31 and extends from the body plate 311 to the fixed portion 312; the sampling terminal 33 is connected with the sampling trace 32 extending to the fixed portion 312.

[0042] Thus, by arranging the through isolation slit 313 on the flexible substrate 31, the fixing portion 312 has a certain buffer space relative to the body plate 311, that is, the fixing portion 312 has a buffer allowance relative to the body plate 311, so that when the battery monomer 21 included in the battery module 20 expands due to heat, and the battery monomer 21 moves the sampling terminal 33, the fixing portion 312 has a certain displacement allowance, so as to avoid the connection between the battery monomer 21, the sampling terminal 33 and the fixing portion 312 from being loosened due to tension, while ensuring the effectiveness of the connection between the fixing portion 312 and the body plate 311, thereby ensuring the effective collection of the working condition parameters of the battery monomer 21.

[0043] In the embodiment, the flexible substrate 31 can have a plurality of isolation slits 313, so as to form a plurality of fixing portions 312 corresponding to the plurality of sampling terminals 33 through the isolation slits 313, thereby realizing the connection between the flexible substrate 31 and the plurality of busbars 22 through the plurality of sampling terminals 33. The plurality of isolation slits 313 can be distributed on both sides of the length direction X of the flexible substrate 31, and the plurality of isolation slits 313 are distributed in a staggered manner in the length direction X of the flexible substrate 31, and each isolation slit 313 forms a fixing portion 312 on one side in the length direction X of the flexible substrate 31.

[0044] In some embodiments, as shown in FIG. 5, the isolation slit 313 is in a U shape, and the first end portion 314 and the second end portion 315 of the isolation slit 313 are arranged along the width direction Y of the flexible substrate 31 towards the side edge of the flexible substrate 31. Thus, by the U-shaped isolation slit 313, the size of the connecting portion 316 in the width direction Y of the flexible substrate 31 can be reduced, so as to reduce the limiting of the body plate 311 on the fixing portion 312, thereby increasing the buffer space between the fixing portion 312 and the body plate 311, so as to further reduce the tension between the fixing portion 312 and the body plate 311 when the battery monomer 21 expands due to heat, and ensure the effectiveness of the connection between the fixing portion 312 and the body plate 311.

[0045] In the embodiment, the isolation slit 313 can be a right-angle U-shaped structure, or a round-angle U-shaped structure, etc., and the lengths of the two U-shaped arms of the isolation slit 313 are different, so that when the connecting portion 316 is formed between the first end portion 314 of the isolation slit 313 and the edge of the flexible substrate 31, the second end portion 315 can extend to the edge of the flexible substrate 31.

[0046] In some embodiments, as shown in FIG. 5, the flexible substrate 31 further has a connecting bridge 317 connecting the fixed portion 312 and the body plate 311. In this way, by arranging the connecting bridge 317, the connecting area of the fixed portion 312 and the body plate 311 is increased, so as to reduce the sagging of the fixed portion 312 on the flexible substrate 31 due to the gravity of the sampling terminal 33 when the sampling assembly 30 is transported, thereby reducing the pulling of the fixed portion 312 by the sampling terminal 33, and ensuring the transportation effect and efficiency of the sampling assembly 30, thereby improving the assembly efficiency of the sampling assembly 30 on the battery module 20.

[0047] In some embodiments, as shown in FIG. 5, the flexible substrate 31 further has a connecting bridge 317 connecting the fixed portion 312 and the body plate 311. In this way, by arranging the connecting bridge 317, the connecting area of the fixed portion 312 and the body plate 311 is increased, so as to reduce the sagging of the fixed portion 312 on the flexible substrate 31 due to the gravity of the sampling terminal 33 when the sampling assembly 30 is transported, thereby reducing the pulling of the fixed portion 312 by the sampling terminal 33, and ensuring the transportation effect and efficiency of the sampling assembly 30, thereby improving the assembly efficiency of the sampling assembly 30 on the battery module 20.

[0048] In some embodiments, as shown in FIG. 5, the flexible substrate 31 further has a connecting bridge 317 connecting the fixed portion 312 and the body plate 311. In this way, by arranging the connecting bridge 317, the connecting area of the fixed portion 312 and the body plate 311 is increased, so as to reduce the sagging of the fixed portion 312 on the flexible substrate 31 due to the gravity of the sampling terminal 33 when the sampling assembly 30 is transported, thereby reducing the pulling of the fixed portion 312 by the sampling terminal 33, and ensuring the transportation effect and efficiency of the sampling assembly 30, thereby improving the assembly efficiency of the sampling assembly 30 on the battery module 20.

[0049] In some embodiments, as shown in FIG. 5, the flexible substrate 31 further has a connecting bridge 317 connecting the fixed portion 312 and the body plate 311. In this way, by arranging the connecting bridge 317, the connecting area of the fixed portion 312 and the body plate 311 is increased, so as to reduce the sagging of the fixed portion 312 on the flexible substrate 31 due to the gravity of the sampling terminal 33 when the sampling assembly 30 is transported, thereby reducing the pulling of the fixed portion 312 by the sampling terminal 33, and ensuring the transportation effect and efficiency of the sampling assembly 30, thereby improving the assembly efficiency of the sampling assembly 30 on the battery module 20.

[0050] In some embodiments, as shown in FIG. 5, the flexible substrate 31 further has a connecting bridge 317 connecting the fixed portion 312 and the body plate 311. In this way, by arranging the connecting bridge 317, the connecting area of the fixed portion 312 and the body plate 311 is increased, so as to reduce the sagging of the fixed portion 312 on the flexible substrate 31 due to the gravity of the sampling terminal 33 when the sampling assembly 30 is transported, thereby reducing the pulling of the fixed portion 312 by the sampling terminal 33, and ensuring the transportation effect and efficiency of the sampling assembly 30, thereby improving the assembly efficiency of the sampling assembly 30 on the battery module 20.

[0051] Of course, the connecting bridge 317 can also be arranged on the side of the fixed portion 312 away from the edge of the flexible substrate 31 and away from the connecting portion 316 to maximize the stability of the connection between the fixed portion 312 and the body plate 311.

[0052] In the embodiments of the present application, for the sampling wires 32 laid on the flexible substrate 31, the terminal of the flexible substrate 31 at the end is extended to the fixed portion 312 included in the flexible substrate 31 to realize the transmission of the working condition parameters collected by the sampling terminal 33 connected to the fixed portion 312. Specifically, one sampling wire 32 can be extended from the body plate 311 to one fixed portion 312, or multiple sampling wires 32 can be extended from the body plate 311 to one fixed portion 312 as shown in FIG. 5.

[0053] In addition, for the multiple fixed portions 312 included in the flexible substrate 31, in addition to one sampling wire 32 being extended from the body plate 311 to one fixed portion 312 or multiple sampling wires 32 being extended from the body plate 311 to one fixed portion 312, the multiple fixed portions 312 included in the flexible substrate 31 can include a first type of fixed portion 312 and a second type of fixed portion 312, the flexible substrate 31 has a first group of sampling wires 32 corresponding to the first type of fixed portion 312 and a second group of sampling wires 32 corresponding to the second type of fixed portion 312, the first group of sampling wires 32 includes one sampling wire 32, and one sampling wire 32 is extended from the body plate 311 to the corresponding first type of fixed portion 312, the second group of sampling wires 32 includes multiple sampling wires 32, and multiple sampling wires 32 are extended from the body plate 311 to the corresponding second type of fixed portion 312.

[0054] For the case where multiple sampling wires 32 are extended from the body plate 311 to one fixed portion 312, as shown in FIG. 5, the multiple sampling wires 32 include a first wire 321 and a second wire 322, the line width of the first wire 321 is greater than that of the second wire 322, and the first wire 321 is located on the side of the second wire 322 close to the side edge of the flexible substrate 31.

[0055] Thus, by arranging the plurality of sampling traces 32, the collection of various working condition parameters can be realized. Meanwhile, the first trace 321 with a larger line width is arranged on the side close to the edge of the flexible substrate 31, so as to ensure the structural strength of the connecting portion 316, thereby ensuring the connection stability between the fixing portion 312 and the body plate 311. In addition, the sampling terminal 33 is connected to the side of the fixing portion 312 away from the connecting portion 316, so that after the battery monomer 21 expands and drives the sampling terminal 33 to displace along the length direction X of the flexible substrate 31, the sampling terminal 33 will drive the fixing portion 312 to deflect along the width direction Y of the flexible substrate 31. At this time, the first trace 321 on the outermost side of the flexible substrate 31 can ensure the structural strength of the flexible substrate 31 at the edge portion, so as to reduce the risk of tearing between the fixing portion 312 and the body plate 311 after deflection.

[0056] In the embodiment, the number of the second traces 322 can be one or multiple, and the multiple second traces 322 are arranged on the same side of the first trace 321. For example, the plurality of sampling traces 32 include the first trace 321 with a larger line width, and two second traces 322 with a smaller line width arranged away from the edge of the flexible substrate 31.

[0057] In some embodiments, as shown in FIG. 5, the connecting portion 316 has a first reinforcing trace 324 arranged on the side of the second trace 322 away from the first trace 321, and the first reinforcing trace 324 is arranged in an insulating manner with the second trace 322.

[0058] Thus, by arranging the first reinforcing trace 324, the structural strength of the side of the connecting portion 316 away from the edge of the flexible substrate 31 is increased, thereby ensuring the structural strength of the region where the second trace 322 is arranged on the connecting portion 316. In this way, after the sampling terminal 33 drives the fixing portion 312 to displace and pull the connecting portion 316, the tearing of the connecting portion 316 and the disconnection of the second trace 322 can be reduced. In addition, even if the connecting portion 316 is locally cracked due to aging after long-term use of the flexible substrate 31, the aged fragments will not pull the second trace 322 to cause the disconnection of the second trace 322.

[0059] In addition, in combination with the arrangement of the first trace 321 and the second trace 322 with different line widths as described above, since the first trace 321 with a larger line width ensures the structural strength of the region, the first reinforcing trace 324 only needs to be arranged on the side of the second trace 322 away from the first trace 321, thereby simplifying the arrangement of the reinforcing traces on the flexible substrate 31.

[0060] For the case that the plurality of second traces 322 are all located on the same side of the first trace 321, the spacing between the plurality of second traces 322 can be adjusted, and then the first reinforcing trace 324 can be arranged on the side of the second trace 322 farthest from the first trace 321, so as to simplify the arrangement of the reinforcing trace on the flexible substrate 31.

[0061] Optionally, as shown in FIG. 5, the first reinforcing trace 324 includes a mesh trace 328, so as to ensure the uniform distribution of the first reinforcing trace 324 on the connecting portion 316, thereby ensuring the uniformity of the structural strength of the connecting portion 316.

[0062] Further, as shown in FIG. 5, the first reinforcing trace 324 further includes a ring trace 329, and the mesh trace 328 is located in the area surrounded by the ring trace 329 and connected with the ring trace 329. In this way, by arranging the ring trace 329, the mesh gap of the edge portion of the mesh trace 328 can be blocked, so as to avoid the mesh gap of the edge portion of the mesh trace 328 forming a tearing opening of the connecting portion 316, thereby reducing the risk of breaking of the sampling trace 32 on the connecting portion 316.

[0063] Optionally, the first reinforcing trace 324 extends on the flexible substrate 31 to the fixed portion 312 and / or the body plate 311. For example, as shown in FIG. 5, the first reinforcing trace 324 extends to both the fixed portion 312 and the body portion. In this way, by arranging the extension of the first reinforcing trace 324, the integrated structure of the connecting portion 316 and the fixed portion 312 and / or the body plate 311 can be realized, thereby ensuring the connection stability of the connecting portion 316 and the fixed portion 312 and / or the body plate 311.

[0064] It should be noted that for the case that the first reinforcing trace 324 is arranged on the connecting portion 316, the first reinforcing trace 324 can be arranged on the side of the first trace 321 away from the second trace 322, or on the side of the second trace 322 away from the first trace 321, or on both the side of the first trace 321 away from the second trace 322 and the side of the second trace 322 away from the first trace 321, and the present application does not limit the same.

[0065] In some embodiments, as shown in FIG. 5, the fixed portion 312 has a second reinforcing trace 325 located on the side of the second trace 322 away from the first trace 321, and the second reinforcing trace 325 is arranged in an insulating manner with the second trace 322.

[0066] Thus, by arranging the second reinforcing trace 325, the structural strength of the fixed portion 312 on the side away from the edge of the flexible substrate 31 is increased, and the structural strength of the region of the fixed portion 312 where the second trace 322 is located is ensured, so that when the sampling terminal 33 drives the fixed portion 312 to displace and pull the fixed portion 312, the tearing of the fixed portion 312 and the breaking of the second trace 322 are reduced. Even if the fixed portion 312 is cracked in a local region due to aging after long-term use of the flexible substrate 31, the aged fragments will not pull the second trace 322 due to their own gravity, so that the second trace 322 will not be broken.

[0067] The arrangement and structure of the second reinforcing trace 325 can refer to the arrangement and structure of the first reinforcing trace 324 described above, and the embodiments of the present application do not limit the same.

[0068] In some embodiments, as shown in FIG. 5, the body plate 311 has a third reinforcing trace 326 located on the side of the second trace 322 away from the first trace 321, and the third reinforcing trace 326 is arranged to be insulated from the second trace 322.

[0069] Thus, by arranging the third reinforcing trace 326, the structural strength of the region of the body plate 311 where the second trace 322 is located is increased, and even if the region where the second trace 322 is located is cracked in a local region due to aging after long-term use of the flexible substrate 31, the aged fragments will not pull the second trace 322 due to their own gravity, so that the second trace 322 will not be broken.

[0070] The arrangement and structure of the third reinforcing trace 326 can refer to the arrangement and structure of the second reinforcing trace 325 described above, and the embodiments of the present application do not limit the same.

[0071] In some embodiments, as shown in FIG. 5, the first trace 321 includes a fuse 323 located on the body plate 311, and the body plate 311 has a fourth reinforcing trace 327 located on the side of the fuse 323 away from the second trace 322, and the fourth reinforcing trace 327 is arranged to be insulated from the first trace 321.

[0072] Thus, by arranging the fourth reinforcing trace 327, the structural strength of the body plate 311 in the region where the fuse 323 is located is ensured, and even if the region where the fuse 323 is located is cracked in a local region due to aging after long-term use of the flexible substrate 31, the aged fragments will not pull the fuse 323 due to their own gravity, so that the fuse 323 will not be broken.

[0073] The arrangement and structure of the fourth reinforcing trace 327 can refer to the arrangement and structure of the second reinforcing trace 325 described above, and the embodiments of the present application do not limit the same.

[0074] Optionally, in the length direction X of the flexible substrate 31, the size of the fourth reinforcing trace 327 is greater than the size of the fuse 323. In this way, the whole of the fuse 323 can be protected by the fourth reinforcing trace 327, avoiding the situation of the fuse 323 breaking. Of course, in the length direction X of the flexible substrate 31, the size of the fourth reinforcing trace 327 can also be equal to or slightly smaller than the size of the fuse 323, as long as it can reduce the possibility of the fuse 323 breaking.

[0075] For the case that one sampling trace 32 extends to one fixed part 312, the sampling trace 32 includes a transition section and a fuse section, the line width of at least part of the transition section away from the fixed part 312 decreases in the direction away from the fixed part 312, and the transition section is formed with a base end with the largest line width and a tip end with the smallest line width, and the fuse section is connected with the tip end of the transition section.

[0076] In this way, by the setting of the transition section on the sampling trace 32, and by the connection of the tip end on the transition section with the fuse section, the current transmitted along the sampling trace 32 can be concentrated on the fuse section, so as to effectively ensure that the heat generated on the sampling trace 32 is concentrated on the fuse section, thereby ensuring the reliability of the fuse section breaking on the sampling trace 32.

[0077] The transition section can be a triangular structure, that is, the width of the whole part of the transition section decreases in the direction away from the fixed part 312; or the transition section includes a rectangular section and a triangular section, and the triangular section is connected to one side of the rectangular section away from the fixed part 312, that is, the line width of at least part of the transition section away from the fixed part 312 decreases in the direction away from the fixed part 312.

[0078] In addition, the line width of at least part of the transition section away from the fixed part 312 can be continuously decreasing, that is, the side of the part of the transition section with decreasing line width is a smooth side, without forming a step, thereby reducing the situation that the sampling trace 32 is easily torn due to the existence of the step face on the transition section. For example, the side of the part of the transition section with decreasing line width can be a straight line side, that is, the line width of at least part of the transition section away from the fixed part 312 decreases in a straight line shape; or the side of the part of the transition section with decreasing line width can also be a circular arc side, that is, the line width of at least part of the transition section away from the fixed part 312 decreases in a curved line shape.

[0079] Optionally, the base end of the transition section is located on the connecting part 316. In this way, by the setting of the base end of the transition section on the connecting part 316, the structural strength of the connecting part 316 can be effectively ensured, reducing the situation that the connecting part 316 breaks when the fixed part 312 and the body plate 311 are pulled.

[0080] In the embodiments of the present application, the terms "first", "second", "third" are only used for descriptive purpose and should not be understood as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mount", "connect", "connection", "fix", and the like should be interpreted broadly, for example, "connection" can be fixed connection, or detachable connection, or integral connection; "connection" can be direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0081] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it should not be understood as a limitation on the embodiments of the present application.

[0082] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment", and the like, mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0083] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A sampling assembly for an energy storage device, wherein, The application relates to a flexible substrate (31) having an isolation slit (313) and a connecting bridge (317), the isolation slit (313) having a first end (314) and a second end (315), the first end (314) being connected with an edge of the flexible substrate (31) to form a connecting portion (316), the second end (315) extending to a same-side edge of the flexible substrate (31), the isolation slit (313) and the connecting portion (316) separating the flexible substrate (31) into a body plate (311) and a fixed portion (312), the connecting bridge (317) connecting the fixed portion (312) and the body plate (311). A plurality of sampling wires (32) are arranged on the flexible substrate (31) and extend from the body plate (311) to the fixed portion (312), the plurality of sampling wires (32) including a first wire (321) and a second wire (322), the first wire (321) having a larger line width than the second wire (322), and the first wire (321) being located on one side of the second wire (322) close to the side edge of the flexible substrate (31). A sampling terminal (33) is connected with the first wire (321) and the second wire (322) extending to the fixed portion (312). The connecting portion (316) has a first reinforcing wire (324) located on the side of the second wire (322) away from the first wire (321), and the first reinforcing wire (324) is arranged in insulation with the second wire (322).

2. The sampling assembly of claim 1, wherein, The first reinforcing wire (324) extends on the flexible substrate (31) to the fixed portion (312) and / or the body plate (311).

3. The sampling assembly of claim 2, wherein, The first reinforcing wire (324) includes a ring-shaped wire (329) and a grid-shaped wire (328) located inside the ring-shaped wire (329).

4. The sampling assembly of claim 3, wherein, The fixed portion (312) has a second reinforcing wire (325) located on the side of the second wire (322) away from the first wire (321), and the second reinforcing wire (325) is arranged in insulation with the second wire (322).

5. The sampling assembly of claim 1, wherein, The body plate (311) has a third reinforcing wire (326) located on the side of the second wire (322) away from the first wire (321), and the third reinforcing wire (326) is arranged in insulation with the second wire (322).

6. The sampling assembly of claim 1, wherein, The first wire (321) includes a fuse (323) located on the body plate (311), and the body plate (311) has a fourth reinforcing wire (327) located on the side of the fuse (323) away from the second wire (322), and the fourth reinforcing wire (327) is arranged in insulation with the first wire (321).

7. The sampling assembly of claim 1, wherein, In the length direction of the flexible substrate (31), the size of the fourth reinforcing wire (327) is greater than the size of the fuse (323).

8. The sampling assembly of claim 7, wherein, ​ 9. The sampling assembly of any one of claims 1-8, wherein, The isolation slit (313) is L-shaped, a first end (314) of the isolation slit (313) is directed towards an end of the flexible substrate (31) along a length direction of the flexible substrate (31), and a second end (315) is directed towards a side of the flexible substrate (31) along a width direction of the flexible substrate (31).

10. The sampling assembly of any one of claims 1-8, wherein, The isolation slit (313) is U-shaped, a first end (314) and a second end (315) of the isolation slit (313) are directed towards a side of the flexible substrate (31) along a width direction of the flexible substrate (31).

11. The sampling assembly of any one of claims 1-8, wherein, The connecting bridge (317) is located on a side of the fixed part (312) away from the connecting part (316).

12. The sampling assembly of any one of claims 1-8, wherein, The connecting bridge (317) is in a straight line structure, and the connecting bridge (317) is in an insulating structure.

13. An energy storage device, wherein, Comprising: A battery module (20) comprising a plurality of battery cells (21) and a plurality of busbars (22), each busbar (22) connecting at least two battery cells (21) with different polarity electrode terminals; The sampling assembly (30) according to any one of claims 1-12, wherein the sampling assembly (30) comprises a plurality of sampling terminals (33), each sampling terminal (33) being connected to one busbar (22).

14. An energy storage system, wherein, The energy storage system comprises the energy storage device (100) according to claim 13.

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