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, a sampling wire, and a sampling terminal. A connecting portion is formed between a first end portion of an isolation gap on the flexible substrate and an edge of the flexible substrate, and a second end portion of the isolation gap extends to the edge of the flexible substrate on the same side. The sampling wire comprises a transition section and a fuse portion. A base end and a tip end are formed on the transition section, and the fuse portion is connected to the tip end of the transition section.

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. 202411102646.0 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 includes 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 becomes 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 is provided, comprising: a flexible substrate having a through isolation slit, 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; a sampling trace laid on the flexible substrate and extending from the body plate to the fixed portion, the sampling trace including a transition section and a fuse section, at least part of the transition section decreasing in line width in the extension direction of the sampling trace from the fixed portion to the body plate, and forming a base end with the largest line width and a tip end with the smallest line width, the fuse section being connected to the tip end of the transition section; a sampling terminal connected to the sampling trace extending to the fixed portion.

[0008] In the embodiment of the present application, the sampling trace laid on the flexible substrate included in the sampling assembly avoids the setting of connecting wires, thereby 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, by setting the penetrating isolation slot on the flexible substrate, the fixing part has a certain buffer space relative to the body plate, so that when the fixing part is pulled by the sampling terminal after the thermal expansion of the battery monomer, the tearing of the fixing part and the body plate is avoided, and the effective collection of the working condition parameters of the battery monomer is ensured. Furthermore, by connecting the tip of the transition section on the sampling trace with the fuse part, the heat generated when a large current is transmitted along the sampling trace is concentrated on the fuse part, thereby ensuring the reliability of the fuse part on the sampling trace.

[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, the energy storage system 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 features and advantages of the present application will become more apparent through a detailed description of example embodiments thereof with reference to the attached drawings.

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

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

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

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

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

[0018] In the figure, 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, transition section; 322, fusing part; 323, base end; 324, tip; 325, fusing wire; 326, first reinforcing wire; 327, second reinforcing wire; 328, grid-shaped wire; 329, edge wire. DETAILED DESCRIPTION

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

[0022] In order to solve the problem of insufficient electricity demand or insufficient grid accommodation 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 cells 21. The battery cell 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 cell 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 cell 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 cell 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 cells 21 and a plurality of busbars 22, each busbar 22 connecting at least two electrode terminals of different polarity of the battery cells 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 battery cells 21 connected by the busbar 22 can be collected through the sampling terminals 33 and then transmitted to the battery management system 40, so as to realize the monitoring of the plurality of battery cells 21. In addition, through the flexible substrate 31 included in the sampling assembly 30, the situation of complicated connection wires caused by too many connection wires is avoided, so as to facilitate the simplification of the connection between the battery cells 21 and the battery management system 40, and improve 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, thus 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] In this way, by providing the through isolation slot 313 on the flexible substrate 31, the fixed portion 312 has a certain buffer space relative to the body plate 311, so that when the fixed portion 312 is pulled by the sampling terminal 33 after thermal expansion of the battery monomer 21, the tearing of the fixed portion 312 and the body plate 311 is avoided, and the effective collection of the working condition parameters of the battery monomer 21 is ensured.

[0043] The flexible substrate 31 can have a plurality of isolation slits 313, and the plurality of isolation slits 313 form a plurality of fixed portions 312 corresponding to the plurality of sampling terminals 33 through the isolation slits 313, so as to realize 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 fixed 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 314 and the second end 315 of the isolation slit 313 are directed to the side edge of the flexible substrate 31 along the width direction Y of the flexible substrate 31. In this way, the size of the connecting portion 316 in the width direction Y of the flexible substrate 31 can be reduced through the U-shaped isolation slit 313, so as to reduce the limiting of the fixed portion 312 by the body plate 311, and further increase the buffer space between the fixed portion 312 and the body plate 311, so as to further reduce the pulling between the fixed portion 312 and the body plate 311 when the battery monomer 21 is subjected to thermal expansion, and ensure the effectiveness of the connection between the fixed portion 312 and the body plate 311.

[0045] The isolation slit 313 can be a right-angle U-shaped structure or a round-angle U-shaped structure, 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 314 of the isolation slit 313 and the edge of the flexible substrate 31, the second end 315 can extend to the edge of the flexible substrate 31.

[0046] In other embodiments, the isolation slit 313 is in an L shape, the first end 314 of the isolation slit 313 is directed to the end of the flexible substrate 31 along the length direction X of the flexible substrate 31, and the second end 315 is directed to the side edge of the flexible substrate 31 along the width direction Y of the flexible substrate 31. In this way, through the L-shaped isolation slit 313, the fixed portion 312 and the body plate 311 can have a connecting portion 316 with a large size, so as to ensure the stability of the connection between the fixed portion 312 and the body plate 311, and at the same time, the setting space of the sampling wire 32 on the flexible substrate 31 extending to the fixed portion 312 can be ensured, so as to reduce the setting difficulty of the sampling wire 32.

[0047] In some embodiments, as shown in FIG. 5, the flexible substrate 31 further has a connecting bridge 317 connecting the fixing portion 312 and the body plate 311. In this way, by arranging the connecting bridge 317, the connecting area of the fixing portion 312 and the body plate 311 is increased, so as to reduce the sagging of the fixing 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 sampling terminal 33 on the fixing portion 312, while 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] The width of the connecting bridge 317 is smaller than the width of the connecting portion 316. The connecting bridge 317 can be an insulating structure, i.e. in the case that the flexible substrate 31 includes a double-layer insulating film and the sampling trace 32 as described above, the part where the connecting bridge 317 is located is a pure insulating film structure. Of course, the connecting bridge 317 can also be provided with a metal trace, i.e. a metal trace is arranged between the double-layer insulating films in the area of the connecting bridge 317. In this way, the structural strength of the connecting bridge 317 can be increased by arranging the metal trace, thereby ensuring the stability of the connecting bridge 317 connecting the fixing portion 312 and the body plate 311.

[0049] The connecting bridge 317 can be a straight line structure or a winding structure. For the winding structure, the connecting bridge 317 can be a corrugated structure or a sawtooth structure. When the connecting bridge 317 is a winding structure, a certain buffer margin can be formed between the fixing portion 312 and the body plate 311, so as to avoid the situation that the connecting bridge 317 is broken due to the pulling of the fixing portion 312 caused by the expansion of the battery monomer 21 while ensuring the stability of the connection between the fixing portion 312 and the body plate 311.

[0050] Optionally, as shown in FIG. 5, the connecting bridge 317 is located on the side of the fixing portion 312 away from the connecting portion 316. In this way, the two ends of the fixing portion 312 in the length direction X of the flexible substrate 31 can be fixed and connected, thereby ensuring the stability of the connection between the fixing portion 312 and the body plate 311, and avoiding the sagging of the fixing portion 312 due to the gravity of the sampling terminal 33.

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

[0052] In the embodiments of the present application, for the sampling trace 32 laid on the flexible substrate 31, one sampling trace 32 can extend from the body plate 311 to one fixed portion 312 as shown in FIG. 5, or a plurality of sampling traces 32 can extend from the body plate 311 to one fixed portion 312. In addition, for the plurality of fixed portions 312 included in the flexible substrate 31, in addition to one sampling trace 32 extending from the body plate 311 to one fixed portion 312 or a plurality of sampling traces 32 extending from the body plate 311 to one fixed portion 312, the plurality of 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 traces 32 corresponding to the first type of fixed portion 312, and a second group of sampling traces 32 corresponding to the second type of fixed portion 312, the first group of sampling traces 32 includes one sampling trace 32, and one sampling trace 32 extends from the body plate 311 to the corresponding first type of fixed portion 312, and the second group of sampling traces 32 includes a plurality of sampling traces 32, and the plurality of sampling traces 32 all extend from the body plate 311 to the corresponding second type of fixed portion 312.

[0053] For the case that one sampling trace 32 extends from the body plate 311 to one fixed portion 312, as shown in FIG. 5, the sampling trace 32 includes a transition section 321 and a fuse section 322, at least part of the line width of the transition section 321 decreases in the extension direction of the sampling trace 32 and in the direction from the fixed portion 312 to the body plate 311, and the transition section 321 is formed with a base end 323 having the maximum line width and a tip end 324 having the minimum line width, and the fuse section 322 is connected to the tip end 324 of the transition section 321.

[0054] In this way, by providing the transition section 321 on the sampling trace 32, and by connecting the tip end 324 on the transition section 321 to the fuse section 322, the current transmitted along the sampling trace 32 can be concentrated on the fuse section 322, so as to effectively ensure that the heat generated on the sampling trace 32 is concentrated on the fuse section 322, thereby ensuring the reliability of the fuse section 322 on the sampling trace 32.

[0055] In the embodiments of the present application, for the sampling trace 32 laid on the flexible substrate 31, one sampling trace 32 can extend from the body plate 311 to one fixed portion 312 as shown in FIG. 5, or a plurality of sampling traces 32 can extend from the body plate 311 to one fixed portion 312. In addition, for the plurality of fixed portions 312 included in the flexible substrate 31, in addition to one sampling trace 32 extending from the body plate 311 to one fixed portion 312 or a plurality of sampling traces 32 extending from the body plate 311 to one fixed portion 312, the plurality of 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 traces 32 corresponding to the first type of fixed portion 312, and a second group of sampling traces 32 corresponding to the second type of fixed portion 312, the first group of sampling traces 32 includes one sampling trace 32, and one sampling trace 32 extends from the body plate 311 to the corresponding first type of fixed portion 312, and the second group of sampling traces 32 includes a plurality of sampling traces 32, and the plurality of sampling traces 32 all extend from the body plate 311 to the corresponding second type of fixed portion 312.

[0056] In addition, the line width of at least part of the transition section 321 away from the fixed section 312 can be continuously decreased, that is, the side of the part of the transition section 321 where the line width decreases is a smooth side and no step is formed, thereby reducing the case that the sampling wire 32 is easily torn due to the presence of the step surface on the transition section 321. For example, the side of the part of the transition section 321 where the line width decreases can be a straight side, that is, the line width of at least part of the transition section 321 away from the fixed section 312 decreases in a straight line; or the side of the part of the transition section 321 where the line width decreases can also be a circular arc side, that is, the line width of at least part of the transition section 321 away from the fixed section 312 decreases in a curved line.

[0057] Optionally, as shown in FIG. 5, the base end 323 of the transition section 321 is located on the connecting section 316. In this way, by arranging the base end 323 of the transition section 321 on the connecting section 316, the structural strength of the connecting section 316 can be effectively ensured, and the case that the connecting section 316 is broken when the fixed section 312 is pulled by the body plate 311 is reduced.

[0058] In some embodiments, as shown in FIG. 5, the fixed section 312 has a first reinforcing wire 326 located on at least one side of the sampling wire 32. In this way, by arranging the first reinforcing wire 326, the structure of the fixed section 312 is facilitated to be increased, thereby avoiding the case that the fixed section 312 is torn due to the sampling wire 32 on the fixed section 312 being pulled by the sampling terminal 33 when the battery monomer 21 expands, so as to facilitate to ensure that the sampling wire 32 of the fixed section 312 effectively collects the working condition parameters of the battery monomer 21.

[0059] In some embodiments, as shown in FIG. 5, the fixed section 312 has a first reinforcing wire 326 located on at least one side of the sampling wire 32. In this way, by arranging the first reinforcing wire 326, the structure of the fixed section 312 is facilitated to be increased, thereby avoiding the case that the fixed section 312 is torn due to the sampling wire 32 on the fixed section 312 being pulled by the sampling terminal 33 when the battery monomer 21 expands, so as to facilitate to ensure that the sampling wire 32 of the fixed section 312 effectively collects the working condition parameters of the battery monomer 21.

[0060] Optionally, as shown in FIG. 5, the first reinforcing wire 326 includes a grid-shaped wire 328, so that the uniform distribution of the first reinforcing wire 326 on the fixed section 312 can be ensured, thereby ensuring the uniformity of the structural strength of the fixed section 312.

[0061] Further, as shown in FIG. 5, the first reinforcing trace 326 further includes an edge trace 329 arranged along an edge of the fixed portion 312, and the grid-shaped trace 328 is located in an area enclosed by the edge trace 329 and connected to the edge trace 329. In this way, by arranging the edge trace 329, the grid gap of the edge portion of the grid-shaped trace 328 can be blocked to avoid the grid gap of the edge portion of the grid-shaped trace 328 forming a tearing opening of the fixed portion 312, thereby reducing the risk of breaking of the sampling trace 32 on the fixed portion 312.

[0062] Optionally, the edge trace 329 has two end portions close to the connecting portion 316, and the two end portions are respectively connected to two corner portions of the base end 323 on the transition section 321. In this way, the stability of the connection between the fixed portion 312 and the connecting portion 316 can be ensured, and the risk of breaking between the fixed portion 312 and the connecting portion 316 can be reduced.

[0063] In some embodiments, as shown in FIG. 5, the fusing portion 322 is located on the body plate 311 and includes a fusing wire 325, and the body plate 311 has a second reinforcing trace 327 located on at least one side of the fusing wire 325, and the second reinforcing trace 327 is arranged in insulation with the sampling trace 32.

[0064] In this way, by arranging the second reinforcing trace 327, the structural strength of the body plate 311 in the area where the fusing wire 325 is located can be ensured, and even if the local area of the fusing wire 325 is broken due to aging after long-term use of the flexible substrate 31, the broken pieces caused by aging will not pull the fusing wire 325 due to its own gravity, thereby avoiding the situation that the fusing wire 325 is broken.

[0065] The arrangement area and structure of the second reinforcing trace 327 can refer to the arrangement area and structure of the first reinforcing trace 326 described above, and the embodiments of the present application are not limited thereto.

[0066] Optionally, in the length direction X of the flexible substrate 31, the size of the second reinforcing trace 327 is greater than the size of the fusing wire 325. In this way, the entire fusing wire 325 included in the fusing portion 322 can be protected by the second reinforcing trace 327, thereby avoiding the situation that the fusing wire 325 is broken. Of course, in the length direction X of the flexible substrate 31, the size of the second reinforcing trace 327 can also be equal to or slightly smaller than the size of the fusing wire 325, as long as the possibility of breaking of the fusing wire 325 can be reduced.

[0067] For the case that a plurality of sampling traces 32 extend to one fixed portion 312, the plurality of sampling traces 32 include a first trace and a second trace, the line width of the first trace is greater than the line width of the second trace, and the first trace is located on one side of the second trace close to the side edge of the flexible substrate 31.

[0068] Thus, by arranging the plurality of sampling traces 32, the collection of various working condition parameters can be realized. Meanwhile, the first trace with a larger line width is arranged near the side 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 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.

[0069] In the embodiment, the number of the second traces can be one or multiple, and the multiple second traces are arranged on the same side of the first trace. For example, the plurality of sampling traces 32 include the first trace with a larger line width, and two second traces with a smaller line width arranged away from the edge of the flexible substrate 31.

[0070] In some embodiments, the connecting portion 316 has a third reinforcing trace arranged on the side of the second trace away from the first trace, and the third reinforcing trace is insulated from the second trace.

[0071] Thus, by arranging the third reinforcing trace, 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 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 can be reduced. Meanwhile, even if the connecting portion 316 is locally fragmented due to aging after long-term use of the flexible substrate 31, the aged fragments will not pull the second trace to cause the disconnection of the second trace.

[0072] In addition, in combination with the arrangement of the first trace and the second trace with different line widths as described above, since the first trace with a larger line width ensures the structural strength of the region, the third reinforcing trace only needs to be arranged on the side of the second trace away from the first trace, thereby simplifying the arrangement of the reinforcing traces on the flexible substrate 31.

[0073] For the case that the plurality of second traces are included in the plurality of sampling traces 32, since the plurality of second traces are located on the same side of the first trace, the spacing between the plurality of second traces can be adjusted, and then a third reinforcing trace is arranged on the side away from the first trace of the second trace farthest from the first trace, so as to simplify the arrangement of the reinforcing trace on the flexible substrate 31. In addition, the specific arrangement of the third reinforcing trace can refer to the arrangement of the first reinforcing trace 326 described above, and the embodiments of the present application are not limited thereto. For example, the third reinforcing trace includes a ring-shaped trace and a grid-shaped trace 328 located inside the ring-shaped trace.

[0074] Optionally, the third reinforcing trace extends on the flexible substrate 31 to the fixed part 312 and / or the body plate 311. In this way, the extension arrangement of the third reinforcing trace can realize the integrated structure of the connecting part 316 and the fixed part 312 and / or the body plate 311, thereby ensuring the connection stability of the connecting part 316 and the fixed part 312 and / or the body plate 311.

[0075] In some embodiments, the fixed part 312 has a fourth reinforcing trace located on the side of the second trace away from the first trace, and the fourth reinforcing trace is arranged in insulation with the second trace.

[0076] In this way, the arrangement of the fourth reinforcing trace facilitates to increase the structural strength of the side of the fixed part 312 away from the edge of the flexible substrate 31, thereby ensuring the structural strength of the region of the second trace on the fixed part 312, so as to reduce the tearing of the fixed part 312 and the disconnection of the second trace when the sampling terminal 33 drives the fixed part 312 to displace and pull the fixed part 312; at the same time, even if the fixed part 312 is locally fragmented due to aging after long-term use of the flexible substrate 31, the aged fragments will not pull the second trace due to their own gravity to cause the disconnection of the second trace.

[0077] The arrangement region and structure of the fourth reinforcing trace can refer to the arrangement region and structure of the first reinforcing trace 326 described above, and the embodiments of the present application are not limited thereto.

[0078] In some embodiments, the body plate 311 has a fifth reinforcing trace located on the side of the second trace away from the first trace, and the fifth reinforcing trace is arranged in insulation with the second trace.

[0079] In this way, the arrangement of the fifth reinforcing trace facilitates to increase the structural strength of the region of the second trace on the body plate 311, thereby avoiding the disconnection of the second trace caused by the aging fragments pulling the second trace due to their own gravity even if the region of the second trace is locally fragmented due to aging after long-term use of the flexible substrate 31.

[0080] The setting area and structure of the fifth reinforcing trace can refer to the setting area and structure of the second reinforcing trace 327, which is not limited in the embodiments of the present application.

[0081] In some embodiments, the first trace includes a fuse 325 on the body plate 311, and the body plate 311 has a sixth reinforcing trace on a side of the fuse 325 away from the second trace, and the sixth reinforcing trace is insulated from the first trace.

[0082] In this way, by setting the sixth reinforcing trace, the structural strength of the body plate 311 in the area where the fuse 325 is located can be ensured, and even if the area where the fuse 325 is located is cracked due to aging after long-term use of the flexible substrate 31, the aged fragments will not pull the fuse 325 due to its own gravity, causing the fuse 325 to break.

[0083] The setting area and structure of the sixth reinforcing trace can refer to the setting area and structure of the second reinforcing trace 327, which is not limited in the embodiments of the present application.

[0084] Optionally, in the length direction X of the flexible substrate 31, the size of the sixth reinforcing trace is greater than the size of the fuse 325. In this way, the entire fuse 325 can be protected by the sixth reinforcing trace to avoid the fuse 325 from breaking. Of course, in the length direction X of the flexible substrate 31, the size of the sixth reinforcing trace can also be equal to or slightly smaller than the size of the fuse 325, as long as it can reduce the possibility of the fuse 325 breaking.

[0085] In the embodiments of the present application, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0086] 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 for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0087] In the description of the application, the terms "one embodiment", "some embodiments”, "certain embodiments”, etc. do not necessarily refer to the same embodiment or example, but instead can refer to one or more possible embodiments or examples that do not necessarily refer to prior art. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0088] The specific embodiments described herein are examples of the application and are not intended to limit the application unless otherwise specifically indicated. Various modifications, equivalents and alternatives to the described embodiments are possible and contemplated. Any such changes, equivalents or alternatives are intended to be included within the scope of the application.

Claims

1. A sampling assembly for an energy storage device, wherein, The application relates to a flexible substrate (31) with an isolation slit (313) extending therethrough, the isolation slit (313) having a first end (314) and a second end (315), the first end (314) and an edge of the flexible substrate (31) forming 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); a sampling trace (32) laid on the flexible substrate (31) and extending from the body plate (311) to the fixed portion (312), the sampling trace (32) comprising a transition section (321) and a fuse portion (322), at least part of the transition section (321) having a line width decreasing in an extension direction of the sampling trace (32) from the fixed portion (312) to the body plate (311), and having a base end (323) with the largest line width and a tip end (324) with the smallest line width, the fuse portion (322) being connected to the tip end (324) of the transition section (321); and a sampling terminal (33) connected to the sampling trace (32) extending to the fixed portion (312). The base end (323) of the transition section (321) is located on the connecting portion (316). The fixed portion (312) has a first reinforcing trace (326) located on at least one side of the sampling trace (32). The first reinforcing trace (326) comprises an edge trace (329) arranged along an edge of the fixed portion (312) and a mesh trace (328) located in an area surrounded by the edge trace (329) and connected to the edge trace (329).

2. The sampling assembly of claim 1, wherein, The fuse portion (322) is located on the body plate (311), the fuse portion (322) comprises a fuse wire (325), and the body plate (311) has a second reinforcing trace (327) located on at least one side of the fuse wire (325), the second reinforcing trace (327) being arranged in insulation with the sampling trace (32).

3. The sampling assembly of claim 2, wherein, In a length direction of the flexible substrate (31), the size of the second reinforcing trace (327) is greater than the size of the fuse wire (325).

4. The sampling assembly of claim 3, wherein, The isolation slit (313) is in a U shape, and the first end (314) and the second end (315) of the isolation slit (313) are directed towards the side edge of the flexible substrate (31) in a width direction of the flexible substrate (31).

5. A sampling assembly as claimed in any of claims 2 to 4, wherein, The flexible substrate (31) further has a connecting bridge (317) connecting the fixed portion (312) and the body plate (311).

6. The sampling assembly of claim 5, wherein, The connecting bridge (317) is located on a side of the fixed portion (312) away from the connecting portion (316).

7. The sampling assembly of any one of claims 1-4, wherein, The connecting bridge (317) is in a straight-line structure.

8. The sampling assembly of any one of claims 1-4, wherein, The connecting bridge (317) is in a corrugated or zigzag structure.

9. The sampling assembly of claim 8, wherein, The connecting bridge (317) has a metal trace thereon.

10. The sampling assembly of claim 8, wherein, The application relates to a flexible substrate (31) with an isolation slit (313) extending therethrough, the isolation slit (313) having a first end (314) and a second end (315), the first end (314) and an edge of the flexible substrate (31) forming 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); a sampling trace (32) laid on the flexible substrate (31) and extending from the body plate (311) to the fixed portion (312), the sampling trace (32) comprising a transition section (321) and a fuse portion (322), at least part of the transition section (321) having a line width decreasing in an extension direction of the sampling trace (32) from the fixed portion (312) to the body plate (311), and having a base end (323) with the largest line width and a tip end (324) with the smallest line width, the fuse portion (322) being connected to the tip end (324) of the transition section (321); and a sampling terminal (33) connected to the sampling trace (32) extending to the fixed portion (312).

11. The sampling assembly of claim 8, wherein, ​ 12. The sampling assembly of claims 9-11, wherein, ​ 13. An energy storage device, wherein, ​ A battery module (20) comprising a plurality of battery cells (21) and a plurality of busbars (22), each of the busbars (22) connecting at least two battery cells (21) at electrode terminals of different polarity; The sampling assembly (30) of any one of claims 1-12, the sampling assembly (30) comprising a plurality of the sampling terminals (33), each of the sampling terminals (33) connected to one of the busbars (22).

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

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