Sampling assembly, energy storage device and energy storage system

Abstract

The utility model discloses a sampling assembly, an energy storage device and an energy storage system, and relates to the technical field of energy storage. The sampling assembly comprises a flexible substrate which is provided with an isolation seam and a connecting bridge, the flexible substrate is divided into a body plate and a fixing part, and the fixing part and the body plate are connected through the connecting bridge; the sampling wires are laid on the flexible substrate, the wire width of the first wires is larger than that of the second wires, and the first wires are located on the sides, close to the side edge of the flexible substrate, of the second wires; and the sampling terminal is connected with the sampling wire of the fixed part. In the embodiment of the invention, the flexible substrate replaces the arrangement of a connecting wire, so that the connection between the battery monomer and the battery management system is simplified, and meanwhile, the power utilization safety is improved; besides, the isolation seam on the flexible substrate enables the fixed part and the body plate to have a certain buffer space, so that when the fixed part is pulled after the battery monomers are thermally expanded, the situation that the fixed part and the body plate are torn is avoided, and effective acquisition of working condition parameters of the battery monomers is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and more particularly, to a sampling component, an energy storage device, and an energy storage system. Background Art

[0002] Currently, existing energy storage devices include battery modules, and the operating condition parameters of each battery cell included in the battery module are transmitted to the battery management system (BMS) through a wiring acquisition method. Specifically, one end of a connecting wire is connected to the interface end of the battery management system, and the other end is connected to the battery cell to acquire the operating condition parameters of the battery cell. However, currently, under the trend of pursuing high energy density, the number of battery cells included in the energy storage device is increasing continuously. With the above-mentioned wiring acquisition method, the number of connecting wires is relatively large, which excessively occupies the internal space of the battery pack, and the efficiency of manually bundling and arranging the connecting wires is low, which is not conducive to large-scale automated production. This has become a key factor affecting the production cost of the energy storage device. Summary of the Utility Model

[0003] A main object of the present application is to provide a sampling component, an energy storage device, and an energy storage system that can simplify the acquisition of operating condition parameters and improve the safety of power consumption.

[0004] To achieve the above application object, the present application adopts the following technical solutions:

[0005] According to one aspect of the present application, there is provided a sampling component for an energy storage device, including: a flexible substrate having a through isolation slit and a connection bridge, the isolation slit having a first end and a second end, a connection portion being formed between the first end and the edge of the flexible substrate, the second end extending to the same-side edge of the flexible substrate, the isolation slit and the connection portion separating the flexible substrate into a main body plate and a fixing portion, the connection bridge connecting the fixing portion and the main body plate; a plurality of sampling traces laid on the flexible substrate and all extending from the main body plate to the fixing portion, the plurality of sampling traces including a first trace and a second trace, the line width of the first trace being greater than the line width of the second trace, and the first trace being located on the side of the second trace closer to the side edge of the flexible substrate; and sampling terminals connected to the first trace and the second trace extending to the fixing portion.

[0006] In the embodiment of the present application, by sampling the sampling traces laid on the flexible substrate included in the sampling assembly, the setting of connecting wires is avoided, thereby avoiding the complication of wires caused by a large number of connecting wires, facilitating the simplification of the connection between the battery cell and the battery management system, and improving the power consumption safety of the energy storage device at the same time; in addition, by providing a penetrating isolation seam on the flexible substrate, the fixing part has a certain buffer space relative to the main body plate, so that when the sampling terminal pulls the fixing part after the battery cell thermally expands, the situation where the fixing part is torn from the main body plate is avoided, ensuring the effective acquisition of the operating parameters of the battery cell; furthermore, through the setting of multiple sampling traces, the acquisition of various operating parameters can be realized, and at the same time, the first trace with a larger line width is arranged on one side close to the side of the flexible substrate, ensuring the structural strength of the connecting part, thereby ensuring the connection stability between the fixing part and the main body plate.

[0007] According to an embodiment of the present application, wherein the connecting part has a first reinforcing trace located on the side of the second trace away from the first trace, and the first reinforcing trace is insulated from the second trace.

[0008] In the embodiment of the present application, through the setting of the first reinforcing trace, it is convenient to increase the structural strength of the side of the connecting part away from the edge of the flexible substrate, and further ensure the structural strength of the area where the second trace is located on the connecting part, so as to reduce the situation where the connecting part is torn and the second trace is disconnected after the sampling terminal drives the fixing part to displace and pull the connecting part; at the same time, after the flexible substrate is used for a long time, even if the connecting part is cracked in a local area due to aging, it will avoid the situation where the second trace is broken due to the self-weight of the aging fragments pulling the second trace.

[0009] According to an embodiment of the present application, wherein the first reinforcing trace extends on the flexible substrate to the fixing part and / or the main body plate.

[0010] In the embodiment of the present application, through the extended setting of the first reinforcing trace, an integral structure of the connecting part with the fixing part and / or the main body plate is realized, and further the connection stability between the connecting part and the fixing part and / or the main body plate is ensured.

[0011] According to an embodiment of the present application, wherein the first reinforcing trace includes an annular trace and a grid-like trace located inside the annular trace.

[0012] According to an embodiment of the present application, wherein the fixing part has a second reinforcing trace located on the side of the second trace away from the first trace, and the second reinforcing trace is insulated from the second trace.

[0013] In the embodiment of the present application, by providing the second reinforcing trace, it is convenient to increase the structural strength of the side of the fixing portion away from the edge of the flexible substrate, thereby ensuring the structural strength of the area where the second trace is located on the fixing portion. When the sampling terminal drives the fixing portion to move and pulls the fixing portion, it reduces the situation where the fixing portion is torn and the second trace is disconnected. At the same time, after the flexible substrate is used for a long time, even if the fixing portion is fragmented in a local area due to aging, it can also avoid the situation where the aging fragments pull the second trace due to their own gravity and cause the second trace to break.

[0014] According to an embodiment of the present application, the body board has a third reinforcing trace located on the side of the second trace away from the first trace, and the third reinforcing trace is insulated from the second trace.

[0015] In the embodiment of the present application, by providing the third reinforcing trace, it is convenient to increase the structural strength of the area where the second trace is located on the body board. After the flexible substrate is used for a long time, even if the area where the second trace is located is fragmented in a local area due to aging, it can also avoid the situation where the aging fragments pull the second trace due to their own gravity and cause the second trace to break.

[0016] According to an embodiment of the present application, the first trace includes a fuse located on the body board, and the body board has a fourth reinforcing trace located on the side of the fuse away from the second trace, and the fourth reinforcing trace is insulated from the first trace.

[0017] In the embodiment of the present application, by providing the fourth reinforcing trace, the structural strength of the body board in the area where the fuse is located can be ensured. After the flexible substrate is used for a long time, even if the area where the fuse is located is fragmented in a local area due to aging, it can also avoid the situation where the aging fragments pull the fuse due to their own gravity and cause the fuse to break.

[0018] According to an embodiment of the present application, in the length direction of the flexible substrate, the size of the fourth reinforcing trace is larger than the size of the fuse.

[0019] In the embodiment of the present application, the fourth reinforcing trace is provided with a larger size in the length direction of the flexible substrate to achieve overall protection of the fuse and avoid the situation of fuse breakage.

[0020] According to an embodiment of the present application, the isolation slit is L-shaped, the first end of the isolation slit faces the end of the flexible substrate along the length direction of the flexible substrate, and the second end faces the side of the flexible substrate along the width direction of the flexible substrate.

[0021] In the embodiment of the present application, through the L-shaped isolation seam, a connection part with a relatively large size is ensured between the fixing part and the main body plate, so as to ensure the stability of the connection between the fixing part and the main body plate. At the same time, the setting space for a plurality of sampling traces extending from the flexible substrate to the fixing part can also be ensured, so as to reduce the difficulty of setting the sampling traces.

[0022] According to an embodiment of the present application, wherein the isolation seam is U-shaped, and the first end and the second end of the isolation seam face the side of the flexible substrate along the width direction of the flexible substrate.

[0023] In the embodiment of the present application, setting the U-shaped isolation seam facilitates increasing the buffer space between the fixing part and the main body plate, thereby further slowing down the pulling between the fixing part and the main body plate when the battery cell undergoes thermal expansion, so as to further ensure the effectiveness of the connection between the fixing part and the main body plate.

[0024] According to an embodiment of the present application, wherein the connection bridge is located on the side of the fixing part away from the connection part.

[0025] In the embodiment of the present application, the two ends of the fixing part are fixedly connected through the connection part and the connection bridge in the length direction of the flexible substrate, thereby ensuring the stability of the connection between the fixing part and the main body plate and avoiding the situation that the fixing part sags due to the gravity of the sampling terminal.

[0026] According to an embodiment of the present application, wherein the connection bridge is a linear structure and the connection bridge is an insulating structure.

[0027] According to one aspect of the present application, there is provided an energy storage device, characterized in that it includes: a battery module, including a plurality of battery cells and a plurality of busbars, each of the busbars connecting at least two electrode terminals with different polarities on the plurality of battery cells; the sampling component described in the above aspect, the sampling component including a plurality of the sampling terminals, and each of the sampling terminals is connected to one of the busbars.

[0028] According to one aspect of the present application, there is provided an energy storage system, characterized in that the energy storage system includes the energy storage device described in the above aspect.

[0029] 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 THE DRAWINGS

[0030] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present application will become more obvious.

[0031] Figure 1 It is a schematic structural diagram of an energy storage system shown according to an exemplary embodiment.

[0032] Figure 2 It is a schematic structural diagram of an energy storage device shown according to an exemplary embodiment.

[0033] Figure 3 It is a schematic structural diagram of another energy storage device shown according to an exemplary embodiment.

[0034] Figure 4 It is a schematic structural diagram of a sampling component shown according to an exemplary embodiment.

[0035] Figure 5 is Figure 4 A partial enlarged structural diagram of the shown sampling component.

[0036] Among them, the reference numerals are explained as follows:

[0037] 100, energy storage device; 200, power conversion device; 300, user load;

[0038] 10, battery box; 20, battery module; 30, sampling component; 40, battery management system; 50, wire harness;

[0039] 11, lower box; 12, box cover;

[0040] 21, battery cell; 22, bus bar; 23, separator; 24, fixed end plate; 25, cable tie;

[0041] 31, flexible substrate; 32, sampling trace; 33, sampling terminal; 34, connection terminal;

[0042] 311, body plate; 312, fixing part; 313, isolation gap; 314, first end; 315, second end; 316, connection part; 317, connection bridge;

[0043] 321, first trace; 322, second trace; 323, fuse; 324, first reinforcement trace; 325, second reinforcement trace; 326, third reinforcement trace; 327, fourth reinforcement trace; 328, mesh-like trace; 329, annular trace. Detailed implementation manners

[0044] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed descriptions will be omitted.

[0045] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve utilization efficiency, it is necessary to store an energy form in the same energy form or convert it into another energy form through a medium or device, and then release it in a specific energy form based on future applications.

[0046] At present, green energy mainly includes light energy, wind energy, etc. However, problems such as strong intermittency and large volatility are common in light energy and wind energy, which can cause voltage instability in the green power grid (not enough electricity during peak electricity consumption and too much electricity during off-peak electricity consumption). Unstable voltage can damage the power, so the problem of "abandoning wind and light" may be caused due to insufficient electricity demand or insufficient grid acceptance capacity.

[0047] To solve the problems of insufficient electricity demand or insufficient grid acceptance capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electrical energy is converted into other forms of energy through physical or chemical means and stored. When needed, the energy stored in the energy storage device is converted back into electrical energy and released. Simply put, the energy storage device is similar to a large "portable charger", which stores electrical energy when light energy and wind energy are sufficient and releases the stored electrical energy when needed.

[0048] At present, the application scenarios of energy storage (i.e., energy storage) are relatively wide, including energy storage on the power generation side, energy storage on the grid side, energy storage for renewable energy grid connection, and energy storage on the user side, etc. The types of corresponding energy storage devices include:

[0049] (1) Large energy storage containers applied in the energy storage scenario on the grid side can serve as high-quality active and reactive power regulation power sources in the grid, realizing load matching of electrical energy in time and space, enhancing the consumption capacity of renewable energy, and being of great significance in grid system standby, alleviating the power supply pressure during peak loads, and peak shaving and frequency modulation.

[0050] (2) Small and medium-sized energy storage cabinets applied in the industrial and commercial energy storage scenarios (such as banks, shopping malls, etc.) on the user side and household small energy storage boxes applied in the household energy storage scenarios on the user side mainly operate in the mode of "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley positions according to electricity consumption demand, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage device during the low electricity price period; during the high electricity price period, they release the electricity in the energy storage device for use to achieve the purpose of saving electricity charges. In addition, in remote areas and areas with high incidences of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing backup power for themselves and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0051] An embodiment of the present application provides an energy storage system, which includes an energy storage device to store or supply electric energy through the energy storage device.

[0052] Taking the outdoor energy storage scenario in grid-side energy storage as an example, Figure 1 A schematic diagram of an energy storage system provided by an embodiment of the present application is illustrated. The energy storage system includes an energy storage device 100, an electric energy conversion device 200, and a user load 300. The electric energy conversion device 200 (including a solar energy conversion device and 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, other forms of energy such as solar energy and wind energy can be converted into electric energy through the electric energy conversion device 200 and stored through the energy storage device 100. Then, during the peak electricity price period, the energy storage device 100 supplies the user load 300 for use, or during a power grid power outage / power cut, the energy storage device 100 supplies the user load 300 for use.

[0053] Among them, the energy storage device 100 can be a battery module 20 composed of battery cells 21, a battery pack, a battery box, a battery system, etc. 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 the battery cell 21 can be in a cylindrical shape, a flat shape, a cuboid shape, etc. The embodiment of the present application does not limit this. Specifically, the battery cell 21 can achieve the charge and discharge process by using the chemical reaction or change of the energy storage medium (chemical element). Simply put, the electric 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 electric energy reaches the peak, the electric energy stored in the battery cell 21 is released through the chemical reaction or change of the energy storage medium for use, or transferred for use.

[0054] Next, taking the energy storage device 100 including the battery module 20 as an example, the energy storage device 100 will be explained in detail.

[0055] Figure 2 A schematic diagram of the structure of an energy storage device 100 provided by an embodiment of the present application is illustrated. As Figure 2As shown in the figure, the energy storage device 100 includes: a battery module 20 and a sampling component 30. The battery module 20 includes a plurality of battery cells 21 and a plurality of busbars 22. Each busbar 22 is connected to electrode terminals of different polarities on at least two battery cells 21. The sampling component 30 includes a flexible substrate 31 having sampling traces 32 (not shown in the figure), a plurality of sampling terminals 33 (such as connecting nickel sheets) connected to the flexible substrate 31, and a connection terminal 34 provided at the 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 a busbar 22 included in the battery module 20, and the connection terminal 34 is used to connect to a battery management system 40.

[0056] In this way, the operating parameters of the single battery connected by the busbar 22 can be collected through the sampling terminal 33, and then transmitted to the battery management system 40 to realize the monitoring of a plurality of battery cells 21. In addition, through the flexible substrate 31 included in the sampling component 30, the complexity of the acquisition wire harness 50 is avoided, which facilitates the simplification of the connection between the battery cell 21 and the battery management system 40, and improves the power consumption safety of the energy storage device 100 at the same time.

[0057] Among them, each battery cell 21 has positive and negative electrode terminals. The plurality of battery cells 21 can be in a series connection relationship, or a series-parallel combination connection relationship. For the series connection relationship of a plurality of battery cells 21, each busbar 22 can be respectively connected to electrode terminals of different polarities on two battery cells 21 to realize the sequential series connection of a plurality of battery cells 21. For the series-parallel connection relationship of a plurality of battery cells 21, each busbar 22 can be connected to the electrode terminals of two groups of battery cells 21, and the electrode terminals of each group of battery cells 21 have the same polarity, and the electrode terminals of different groups of battery cells 21 have different polarities to realize the series-parallel connection of a plurality of battery cells 21. Exemplarily, each busbar 22 is connected to the electrode terminals of two pairs of battery cells 21, the electrode terminals of each pair of battery cells 21 have the same polarity, and the electrode terminals of the two pairs of battery cells 21 have different polarities to realize the series connection after the pairwise parallel connection of a plurality of battery cells 21.

[0058] Among them, the flexible substrate 31 can be a flexible insulating board to realize the insulation between the sampling traces 32. Positioning holes are provided on the flexible substrate 31, so that when laying the sampling traces 32 on the flexible substrate 31, the flexible substrate 31 can be fixed through the positioning holes, and at the same time, the accuracy of the position of the sampling traces 32 is ensured, thereby improving the production yield.

[0059] In addition, as shown in FIG. 2, the battery module 20 further includes a separator plate 23. The separator plate 23 is located at the top of the battery module 20, and the sampling assembly 30 and a plurality of busbars 22 included in the battery module 20 are located on top of the separator plate 23 and are limited on the separator plate 23 to prevent the sampling assembly 30 from contacting the battery cells 21 and to reduce the contact between the busbars 22 and the battery cells 21.

[0060] Among them, the separator plate 23 can be a plate-like structure made of an insulating material such as a plastic plate. The separator plate 23 has a first limiting groove facing away from the battery cells 21 and a plurality of second limiting grooves. The first limiting groove is in a strip-like structure. The flexible substrate 31 included in the sampling assembly 30 is limited in the first limiting groove on the separator plate 23, and each busbar 22 is limited in one of the second limiting grooves on the separator plate 23 to realize the limitation of the sampling assembly 30 and the plurality of busbars 22 on the separator plate 23 and avoid the shaking of the sampling assembly 30 and the busbars 22.

[0061] In some embodiments, as Figure 2 shown, the battery module 20 includes a pair of fixed end plates 24 arranged oppositely, and a plurality of battery cells 21 are fixed between the pair of fixed end plates 24. The plurality of battery cells 21 and the pair of fixed end plates 24 can be fixed by bundling tools such as cable ties 25.

[0062] Of course, in addition to being fixed by a pair of fixed end plates 24, the plurality of battery cells 21 can also be fixed by a fixing frame. The embodiments of the present application do not limit this.

[0063] In some embodiments, as Figure 3 shown, the energy storage device 100 further includes a battery box 10. The battery box 10 includes a lower box body 11 and a box cover 12. The box cover 12 is fixedly connected to the lower box body 11 to enclose a battery compartment; the battery module 20 is located in the battery compartment of the battery box 10.

[0064] Among them, the number of battery modules 20 accommodated in the battery compartment of the battery box 10 can be 2, 4, 6, 8, etc. The more the number of battery modules 20, the higher the capacity of the energy storage device 100, and thus it is easier to meet the market demand. Exemplarily, as Figure 3 shown, there are 2 rows of battery modules 20 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) accommodated in the battery compartment of the battery box 10, that is, 8 battery modules 20 are accommodated in the battery compartment.

[0065] In addition, as Figure 3As shown, the energy storage device 100 further includes a battery management system 40. The battery management system 40 is connected to the sampling components 30 corresponding to the battery module 20 through a wire harness 50 to obtain the operating parameters of each battery cell 21.

[0066] In an embodiment of the present application, for the flexible substrate 31 included in the sampling component 30, as Figure 4 and Figure 5 shown, the flexible substrate 31 has a through isolation slit 313. The isolation slit 313 has a first end 314 and a second end 315. A connecting portion 316 is formed between the first end 314 and the edge of the flexible substrate 31. The second end 315 extends to the same-side edge of the flexible substrate 31. The isolation slit 313 and the connecting portion 316 divide the flexible substrate 31 into a main body plate 311 and a fixing portion 312; the sampling trace 32 is laid on the flexible substrate 31 and extends from the main body plate 311 to the fixing portion 312; the sampling terminal 33 is connected to the sampling trace 32 extending to the fixing portion 312.

[0067] In this way, by providing a through isolation slit 313 on the flexible substrate 31, a certain buffer space is provided for the fixing portion 312 relative to the main body plate 311, that is, there is a buffer margin between the fixing portion 312 and the main body plate 311. Thus, when the battery cell 21 included in the battery module 20 undergoes thermal expansion and the battery cell 21 drives the sampling terminal 33 to move, the fixing portion 312 has a certain displacement margin to avoid the connection between the battery cell 21, the sampling terminal 33, and the fixing portion 312 from becoming loose due to pulling, and at the same time ensure the effectiveness of the connection between the fixing portion 312 and the main body plate 311, thereby ensuring the effective acquisition of the operating parameters of the battery cell 21.

[0068] Among them, the flexible substrate 31 may have a plurality of isolation slits 313 to form a plurality of fixing 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 may be distributed on both sides of the length direction X of the flexible substrate 31. The plurality of isolation slits 313 are staggeredly distributed in the length direction X of the flexible substrate 31, and a fixing portion 312 is formed on one side where each isolation slit 313 is located in the length direction X of the flexible substrate 31.

[0069] In some embodiments, as Figure 5As shown, the isolation slit 313 is U-shaped, and the first end 314 and the second end 315 of the isolation slit 313 face the side 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 by the U-shaped isolation slit 313, so as to reduce the limitation of the body plate 311 on the fixing portion 312, and further increase the buffer space between the fixing portion 312 and the body plate 311, so as to further slow down the pulling between the fixing portion 312 and the body plate 311 when the battery cell 21 undergoes thermal expansion, and ensure the effectiveness of the connection between the fixing portion 312 and the body plate 311.

[0070] Among them, the isolation slit 313 can be a right-angled U-shaped structure, or a rounded U-shaped structure, etc., and the lengths of the two U-shaped arms of the isolation slit 313 are different, so as to ensure that when a 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.

[0071] In some other embodiments, the isolation slit 313 is L-shaped, the first end 314 of the isolation slit 313 faces the end of the flexible substrate 31 along the length direction X of the flexible substrate 31, and the second end 315 faces the side 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, a connecting portion 316 with a larger size can be ensured between the fixing portion 312 and the body plate 311 to ensure the stability of the connection between the fixing portion 312 and the body plate 311, and at the same time, the setting space of the sampling trace 32 extending from the flexible substrate 31 to the fixing portion 312 can be ensured, so as to reduce the setting difficulty of the sampling trace 32.

[0072] In some embodiments, as Figure 5 shown, the flexible substrate 31 further has a connection bridge 317 connecting the fixing portion 312 and the body plate 311. In this way, through the arrangement of the connection bridge 317, the connection area between the fixing portion 312 and the body plate 311 is increased, so as to reduce the situation that the fixing portion 312 on the flexible substrate 31 sags due to the gravity of the sampling terminal 33 during the transfer of the sampling assembly 30, and further reduce the pulling of the sampling terminal 33 on the fixing portion 312, while ensuring the transfer effect and transfer efficiency of the sampling assembly 30, and further improving the assembly efficiency of the sampling assembly 30 on the battery module 20.

[0073] Among them, the width of the connection bridge 317 is smaller than that of the connection part 316. The connection bridge 317 can be an insulating structure. That is, in the case where the flexible substrate 31 described above includes a double-layer insulating film and a sampling trace 32, the part where the connection bridge 317 is located is a pure insulating film structure. Of course, metal traces can also be provided on the connection bridge 317, that is, metal traces are provided in the area of the connection bridge 317 between the double-layer insulating films. In this way, by setting the metal traces, the structural strength of the connection bridge 317 can be increased, and further the stability of the connection between the connection bridge 317, the fixing part 312 and the body plate 311 can be ensured.

[0074] Among them, the connection bridge 317 can be a straight structure or a winding structure. For the winding structure, the connection bridge 317 can be a corrugated structure or a serrated structure. When the connection bridge 317 is a winding structure, a certain buffer margin can be formed between the fixing part 312 and the body plate 311, so that while ensuring the stability of the connection between the fixing part 312 and the body plate 311, it can also avoid the situation that after the battery cell 21 expands, the fixing part 312 is pulled and the connection bridge 317 is broken.

[0075] Optionally, as Figure 5 shown, the connection bridge 317 is located on the side of the fixing part 312 away from the connection part 316. In this way, the two ends of the fixing part 312 can be fixedly connected in the length direction X of the flexible substrate 31, so as to ensure the stability of the connection between the fixing part 312 and the body plate 311, and avoid the situation that the fixing part 312 sags due to the gravity of the sampling terminal 33.

[0076] Of course, the connection bridge 317 can also be set on the side of the fixing part 312 away from the edge of the flexible substrate 31 and at a position away from the connection part 316 to ensure the stability of the connection between the fixing part 312 and the body plate 311 to the greatest extent.

[0077] In the embodiment of the present application, for the sampling trace 32 laid on the flexible substrate 31, it extends from the wiring terminal at the end of the flexible substrate 31 to the fixing part 312 included in the flexible substrate 31, so as to realize the transmission of the working condition parameters collected by the sampling terminal 33 connected to the fixing part 312. Specifically, one sampling trace 32 can extend from the body plate 311 to one fixing part 312, or as Figure 5 shown, multiple sampling traces 32 extend from the body plate 311 to one fixing part 312.

[0078] In addition, for the multiple fixing parts 312 included in the flexible substrate 31, in addition to the case where one sampling trace 32 extends from the main body plate 311 to one fixing part 312, or multiple sampling traces 32 extend from the main body plate 311 to one fixing part 312, it is also possible that the multiple fixing parts 312 included in the flexible substrate 31 include a first type of fixing part 312 and a second type of fixing part 312. The flexible substrate 31 has a first group of sampling traces 32 corresponding to the first type of fixing part 312 and a second group of sampling traces 32 corresponding to the second type of fixing part 312. The first group of sampling traces 32 includes one sampling trace 32, and one sampling trace 32 extends from the main body plate 311 to the corresponding first type of fixing part 312. The second group of sampling traces 32 includes multiple sampling traces 32, and multiple sampling traces 32 all extend from the main body plate 311 to the corresponding second type of fixing part 312.

[0079] For the case where multiple sampling traces 32 extend from the main body plate 311 to one fixing part 312, as Figure 5 shown, the multiple sampling traces 32 include a first trace 321 and a second trace 322. The line width of the first trace 321 is greater than that of the second trace 322, and the first trace 321 is located on the side of the second trace 322 close to the side of the flexible substrate 31.

[0080] In this way, through the arrangement of the multiple sampling traces 32, the acquisition of various working condition parameters can be realized. At the same time, by setting the first trace 321 with a larger line width on the side close to the side of the flexible substrate 31, the structural strength of the connecting part 316 is ensured, thereby ensuring the connection stability between the fixing part 312 and the main body plate 311. In addition, the sampling terminal 33 is connected to the side of the fixing part 312 away from the connecting part 316. After the battery cell 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 part 312 to deflect along the width direction Y of the flexible substrate 31. At this time, the first trace 321 located on the outermost side of the flexible substrate 31 and with a faster speed can ensure the structural strength of the flexible substrate 31 at the edge part to reduce the risk of tearing between the fixing part 312 and the main body plate 311 after deflection.

[0081] Among them, the number of the second traces 322 can be one or multiple, and multiple second traces 322 are located on the same side of the first trace 321. For example, the multiple sampling traces 32 include a first trace 321 with a larger line width and two second traces 322 with thinner line widths located away from the edge of the flexible substrate 31 on the first trace 321.

[0082] In some embodiments, as Figure 5 shown, the connecting part 316 has a first reinforcing trace 324 located on the side of the second trace 322 away from the first trace 321, and the first reinforcing trace 324 is insulated from the second trace 322.

[0083] Thus, by providing the first reinforcing trace 324, it is convenient to increase the structural strength of the side of the connecting portion 316 away from the edge of the flexible substrate 31, thereby ensuring the structural strength of the region where the second trace 322 is located on the connecting portion 316. 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, which may cause the disconnection of the second trace 322, is reduced. At the same time, after the flexible substrate 31 is used for a long time, even if the connecting portion 316 is locally fragmented due to aging, the aging fragments will not pull the second trace 322 due to their own gravity, resulting in the breakage of the second trace 322.

[0084] In addition, in combination with the above-described arrangement of the first trace 321 and the second trace 322 with different line widths, since the first trace 321 with a larger line width ensures the structural strength of the region where it is located, at this time, only the first reinforcing trace 324 needs to be provided 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.

[0085] Among them, for the case where multiple sampling traces 32 include multiple second traces 322, since the multiple second traces 322 are all located on the same side of the first trace 321, at this time, the spacing between the multiple second traces 322 can be adjusted, and then the first reinforcing trace 324 is provided on the side of the second trace 322 farthest from the first trace 321 away from the first trace 321, so as to simplify the arrangement of the reinforcing traces on the flexible substrate 31.

[0086] Optionally, as Figure 5 shown, the first reinforcing trace 324 includes a grid-shaped trace 328. In this way, the uniform distribution of the first reinforcing trace 324 on the connecting portion 316 can be ensured, thereby ensuring the uniformity of the structural strength of the connecting portion 316.

[0087] Furthermore, as Figure 5 shown, the first reinforcing trace 324 further includes an annular trace 329. The grid-shaped trace 328 is located within the region surrounded by the annular trace 329 and is connected to the annular trace 329. In this way, by providing the annular trace 329, the grid gaps at the edge portion of the grid-shaped trace 328 can be blocked, so as to prevent the grid gaps at the edge portion of the grid-shaped trace 328 from forming a tear in the connecting portion 316, thereby reducing the risk of breakage of the sampling trace 32 on the connecting portion 316.

[0088] Optionally, the first reinforcing trace 324 extends on the flexible substrate 31 to the fixing portion 312 and / or the main body plate 311. Exemplarily, as Figure 5As shown, the first reinforcing trace 324 extends to both the fixing portion 312 and the body portion simultaneously. In this way, through the extended arrangement of the first reinforcing trace 324, an integral structure of the connecting portion 316 with the fixing portion 312 and / or the body board 311 can be achieved, thereby ensuring the connection stability between the connecting portion 316 and the fixing portion 312 and / or the body board 311.

[0089] It should be noted that for the case where the first reinforcing trace 324 is provided on the connecting portion 316, the first reinforcing trace 324 can be located not only on the side of the second trace 322 away from the first trace 321, but also on the side of the first trace 321 away from the second trace 322. Of course, it can also be that the first reinforcing trace 324 is provided on both the side of the second trace 322 away from the first trace 321 and the side of the first trace 321 away from the second trace 322. The embodiments of the present application do not limit this.

[0090] In some embodiments, as Figure 5 shown, the fixing 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 insulated from the second trace 322.

[0091] In this way, through the setting of the second reinforcing trace 325, it is convenient to increase the structural strength of the side of the fixing portion 312 away from the edge of the flexible substrate 31, thereby ensuring the structural strength of the area where the second trace 322 is located on the fixing portion 312. When the sampling terminal 33 drives the fixing portion 312 to displace and pull the fixing portion 312, the situation where the fixing portion 312 is torn and the second trace 322 is disconnected can be reduced; at the same time, after the flexible substrate 31 is used for a long time, even if the fixing portion 312 is locally fragmented due to aging, the situation where the aging fragments pull the second trace 322 due to their own gravity and cause the second trace 322 to break can be avoided.

[0092] Among them, the setting area and structure of the second reinforcing trace 325 can refer to the setting area and structure of the first reinforcing trace 324 described above. The embodiments of the present application do not limit this.

[0093] In some embodiments, as Figure 5 shown, the body board 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 insulated from the second trace 322.

[0094] In this way, by providing the third reinforcing trace 326, it is convenient to increase the structural strength of the area on the main body board 311 where the second trace 322 is located. Thus, after the flexible substrate 31 is used for a long time, even if a local area of the area where the second trace 322 is located is fragmented due to aging, it can be avoided that the fragmented pieces due to aging pull the second trace 322 due to their own gravity and cause the second trace 322 to break.

[0095] Among them, the setting area and structure of the third reinforcing trace 326 can refer to the setting area and structure of the second reinforcing trace 325 described above, and the embodiments of the present application do not limit this.

[0096] In some embodiments, as Figure 5 shown, the first trace 321 includes a fuse 323 located on the main body board 311. The main body board 311 has a fourth reinforcing trace 327 on the side of the fuse 323 away from the second trace 322, and the fourth reinforcing trace 327 is insulated from the first trace 321.

[0097] In this way, by providing the fourth reinforcing trace 327, the structural strength of the main body board 311 in the area where the fuse 323 is located can be ensured. Thus, after the flexible substrate 31 is used for a long time, even if a local area of the area where the fuse 323 is located is fragmented due to aging, it can be avoided that the fragmented pieces due to aging pull the fuse 323 due to their own gravity and cause the fuse 323 to break.

[0098] Among them, the setting area and structure of the fourth reinforcing trace 327 can refer to the setting area and structure of the second reinforcing trace 325 described above, and the embodiments of the present application do not limit this.

[0099] Optionally, in the length direction X of the flexible substrate 31, the size of the fourth reinforcing trace 327 is larger than the size of the fuse 323. In this way, the overall protection of the fuse 323 can be achieved by the fourth reinforcing trace 327 to avoid the breakage of the fuse 323. 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 the possibility of the fuse 323 breaking can be reduced.

[0100] For the case where a sampling trace 32 extends to a fixing part 312, the sampling trace 32 includes a transition section and a fusing section. The line width of at least a part of the transition section away from the fixing part 312 decreases in the direction away from the fixing part 312, and the transition section forms a base end with the largest line width and a tip end with the smallest line width. The fusing section is connected to the tip end of the transition section.

[0101] Thus, through the setting of the transition section on the sampling trace 32 and the connection between the tip on the transition section and the fusing portion, the current transmitted along the sampling trace 32 can converge on the fusing portion, effectively ensuring that the heat generated on the sampling trace 32 is concentrated on the fusing portion, thereby ensuring the reliability of the fusing of the fusing portion on the sampling trace 32.

[0102] Among them, the transition section can be a triangular structure, that is, the width of the overall part of the transition section decreases in the direction away from the fixing portion 312; or the transition section includes a rectangular section and a triangular section, and the triangular section is connected to the side of the rectangular section away from the fixing portion 312, that is, the line width of a part of the transition section away from the fixing portion 312 decreases in the direction away from the fixing portion 312.

[0103] In addition, the line width of at least a part of the transition section away from the fixing portion 312 can be continuously decreased, that is, the side of the part where the line width of the transition section decreases is a smooth edge and no step is formed, thereby reducing the situation that the sampling trace 32 is easily torn due to the existence of the step surface in the transition section. Exemplarily, the side of the part where the line width of the transition section decreases can be a straight edge, that is, the line width of at least a part of the transition section away from the fixing portion 312 decreases linearly; or, the side of the part where the line width of the transition section decreases can also be an arc edge, that is, the line width of at least a part of the transition section away from the fixing portion 312 decreases curvilinearly.

[0104] Optionally, the base end of the transition section is located on the connecting portion 316. Thus, through the setting of the base end of the transition section on the connecting portion 316, the structural strength of the connecting portion 316 can be effectively ensured, and the situation that the connecting portion 316 breaks when the fixing portion 312 and the main body plate 311 are pulled is reduced.

[0105] In the embodiments of the present application, the terms "first", "second", and "third" are only used for the purpose of description and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0106] In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0107] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means 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 embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0108] The above are only the preferred embodiments of the embodiments of the present application and are not used to limit the embodiments of the present application. For those skilled in the art, various changes and modifications can be made to the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included within the protection scope of the embodiments of the present application.

Claims

1. A sampling assembly for an energy storage device, characterized in that: include: A flexible substrate (31) having a through-going isolation slit (313) and a connecting bridge (317); the isolation slit (313) having a first end (314) and a second end (315); a connecting portion (316) is formed between the first end (314) and an edge of the flexible substrate (31); the second end (315) extends to the same side edge of the flexible substrate (31); the isolation slit (313) and the connecting portion (316) separate the flexible substrate (311) into a main body plate (311) and a fixed portion (312); and the connecting bridge (317) connects the fixed portion (312) and the main body plate (311); A plurality of sampling lines (32) are laid on the flexible substrate (31) and extend from the main body plate (311) to the fixing portion (312); the plurality of sampling lines (32) include a first line (321) and a second line (322); the line width of the first line (321) is greater than the line width of the second line (322), and the first line (321) is located on a side of the second line (322) close to a side of the flexible substrate (31); The sampling terminal (33) is connected to a first wiring (321) and a second wiring (322) extending to the fixing portion (312).

2. The sampling assembly according to claim 1, characterized in that The connecting portion (316) comprises a first reinforcing line (324) located on a side of the second line (322) away from the first line (321), and the first reinforcing line (324) is insulated from the second line (322).

3. The sampling assembly according to claim 2, characterized in that: The first reinforcement trace (324) extends on the flexible substrate (31) to the fixing portion (312) and / or the main body plate (311).

4. The sampling assembly according to claim 3, characterized in that: The first reinforcement wiring (324) includes a ring-shaped wiring (329) and a grid-shaped wiring (328) located inside the ring-shaped wiring (329).

5. The sampling assembly according to claim 1, characterized in that: The fixing portion (312) has a second reinforcing wiring (325) located on a side of the second wiring (322) away from the first wiring (321), and the second reinforcing wiring (325) is insulated from the second wiring (322).

6. The sampling assembly according to claim 1, characterized in that: The main body board (311) has a third reinforcement line (326) located on a side of the second line (322) away from the first line (321), and the third reinforcement line (326) is insulated from the second line (322).

7. The sampling assembly according to claim 1, characterized in that: The first routing line (321) comprises a fuse (323) located on the main body board (311), and the main body board (311) has a fourth reinforcement routing line (327) located on a side of the fuse (323) away from the second routing line (322), and the fourth reinforcement routing line (327) is insulated from the first routing line (321).

8. The sampling assembly according to claim 7, characterized in that: In the length direction of the flexible substrate (31), the size of the fourth reinforcement trace (327) is greater than the size of the fuse (323).

9. The sampling assembly according to any one of claims 1 to 8, characterized in that: The isolation slit (313) is L-shaped, a first end (314) of the isolation slit (313) is directed toward the end of the flexible substrate (31) along the length direction of the flexible substrate (31), and a second end (315) is directed toward the side of the flexible substrate (31) along the width direction of the flexible substrate (31).

10. The sampling assembly according to any one of claims 1 to 8, characterized in that: The isolation slit (313) is U-shaped, and a first end (314) and a second end (315) of the isolation slit (313) are directed toward a side edge of the flexible substrate (31) along a width direction of the flexible substrate (31).

11. The sampling assembly according to any one of claims 1 to 8, characterized in that: The connecting bridge (317) is located on a side of the fixing portion (312) away from the connecting portion (316).

12. The sampling assembly according to any one of claims 1 to 8, characterized in that: The connecting bridge (317) is a linear structure, and the connecting bridge (317) is an insulating structure.

13. An energy storage device, characterized in that: include: A battery module (20) comprising a plurality of battery cells (21) and a plurality of bus bars (22), each of the bus bars (22) being connected to electrode terminals of different polarities on at least two of the battery cells (21); The sampling component (30) according to any one of claims 1 to 12, comprising a plurality of sampling terminals (33), each of the sampling terminals (33) being connected to one of the bus bars (22).

14. An energy storage system, characterized in that: The energy storage system comprises the energy storage device (100) according to claim 13.

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