Battery information collector, battery module and battery pack

Abstract

The application provides a battery information collector, a battery module and a battery pack, and relates to the technical field of batteries.The battery information collector comprises a circuit board, a conductive sheet and a conductive adhesive layer, which is connected between the conductive sheet and the circuit board.The battery information collector is more likely to be corroded and disconnected in harsh working conditions such as electrolyte leakage, thereby reducing the risk of battery information collector short circuit causing the loss of control of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery information collector, a battery module, and a battery pack. Background Technology

[0002] The Battery Information Collector (BIC) is an important component of the battery pack in new energy vehicles. It is responsible for real-time monitoring, data transmission, and safety management to ensure the efficient and safe operation of the battery.

[0003] In some related technologies, battery packs use nickel strips to weld the battery information collector to the cell cover. However, during vehicle use, cell leakage may occur due to manufacturing process issues. The highly corrosive nature of the electrolyte can dissolve the potting compound inside the battery pack and the insulating adhesive of the battery information collector. The battery information collector contains numerous circuits, which may short-circuit with charged metal components within the battery pack or within the collector itself after the electrolyte becomes conductive. In severe cases, this can lead to thermal runaway of the cell, seriously threatening the safety of passengers. Utility Model Content

[0004] This application provides a battery information collector, a battery module, and a battery pack. The battery information collector is more likely to be corroded and disconnected under harsh working conditions such as electrolyte leakage, thereby reducing the risk of cell runaway caused by short circuit of the battery information collector.

[0005] The first aspect of this application provides a battery information collector, comprising: a circuit board; a conductive sheet; and a conductive adhesive layer, wherein the conductive adhesive layer is connected between the conductive sheet and the circuit board.

[0006] In one possible implementation, the conductive adhesive layer includes a matrix and conductive particles filled in the matrix. The matrix may be silicone-based or epoxy resin-based, and the conductive particles may be at least one of aluminum, copper, and silver.

[0007] In one possible implementation, the thickness of the conductive adhesive layer is 100μm-1000μm.

[0008] In one possible implementation, the curing temperature of the conductive adhesive layer is less than or equal to 100°C.

[0009] In one possible implementation, the battery information collector further includes a structural adhesive layer coated on the side of the conductive sheet facing away from the circuit board, the structural adhesive layer connecting the conductive sheet and the circuit board.

[0010] In one possible implementation, the structural adhesive layer is a polyurethane adhesive layer.

[0011] In one possible implementation, the thickness of the structural adhesive layer is 500 μm-2000 μm.

[0012] In one possible implementation, the conductive sheet has a sandblasted surface.

[0013] A second aspect of this application provides a battery module, comprising: a plurality of battery cells; and a battery information collector as described above, wherein the conductive sheet of the battery information collector is connected to each battery cell.

[0014] A third aspect of this application provides a battery pack including a housing and a plurality of battery modules as described above, wherein each battery module is arranged inside the housing.

[0015] The battery information collector, battery module, and battery pack provided in this application utilize a conductive adhesive layer between a conductive sheet and a circuit board to connect the conductive sheet to the circuit board. The adhesive layer's bonding and conductivity ensure the connection strength of the conductive sheet and guarantee reliable electrical conduction between the conductive sheet and the circuit board. Simultaneously, in environments with electrolyte leakage or thermal diffusion, the conductive adhesive is more susceptible to corrosion and melting. Even if it doesn't melt, it will carbonize due to high-temperature burning, significantly increasing the impedance between the conductive sheet and the circuit board and noticeably reducing the current. This significantly reduces the severity of short circuits on the circuit board, lowers the risk of thermal runaway in the battery cells, and protects the system-level safety performance of the battery pack. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery module provided in an embodiment of this application;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of a single cell in a battery module;

[0019] Figure 3 for Figure 1 A partial side view of the battery module in the diagram;

[0020] Figure 4 A structural diagram of a battery information collector provided in an embodiment of this application;

[0021] Figure 5 for Figure 4 Another structural diagram of the battery information collector in the middle;

[0022] Figure 6This is a schematic diagram of the structure of the conductive sheet provided in the embodiments of this application;

[0023] Figure 7 A hierarchical structure diagram of a battery information collector provided in an embodiment of this application;

[0024] Figure 8 This is a hierarchical structure diagram of another battery information collector provided in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 10-Battery module;

[0027] 100 - Battery cell; 101 - Battery cell cover; 110 - Positive electrode plate; 120 - Negative electrode plate;

[0028] 200-Battery Information Collector;

[0029] 210 - Circuit board;

[0030] 220 - Conductive sheet; 221 - First connecting portion; 222 - Extension portion; 2221 - First segment; 2222 - Second segment; 2223 - Third segment; 223 - Second connecting portion;

[0031] 230 - Conductive adhesive layer;

[0032] 240 - Structural adhesive layer. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] This application provides a battery pack that can be used in new energy vehicles. The battery pack may include a casing and multiple battery modules. The casing serves as the outer packaging material of the battery pack, housing and protecting the multiple battery modules. The multiple battery modules are arranged sequentially within the casing to effectively utilize the space within the casing, maximizing the number of battery modules within a limited space and increasing the energy density of the battery pack.

[0035] The battery pack also includes a battery management system (BMS), a thermal management system (liquid cooling and / or air cooling), and an electrical system (including high-voltage wiring harnesses, etc.) to perform safety monitoring, equalization management, and thermal management of the battery modules.

[0036] Figure 1 This is a schematic diagram of the battery module provided in an embodiment of this application. (Refer to...) Figure 1 As shown, the battery module 10 includes a plurality of battery cells 100, which are arranged sequentially and connected in series and parallel to form the battery module 10. For example, the battery cells 100 in the battery module 10 can be arranged sequentially along the thickness direction of the battery cells 100.

[0037] By modularizing the battery cell 100, multiple cells 100 are connected in series and parallel to form an independent battery module 10, and each battery module 10 can be managed independently. This makes the entire battery pack more flexible, allowing individual battery modules 10 to be replaced or upgraded without affecting the overall battery pack.

[0038] like Figure 1 As shown, a key component of the battery management system in the battery pack includes a battery information collector 200. The battery information collector 200 achieves accurate monitoring of the status of the battery cells 100 through real-time data acquisition and intelligent analysis. For the modular battery module 10, the battery information collector 200 can be integrated into the battery module 10, and each battery information collector 200 can simultaneously perform real-time monitoring and data acquisition of all the battery cells 100 in the battery module 10.

[0039] The battery information collector 200 can collect data such as voltage, current, and temperature of the battery cell 100, convert them into digital signals for storage and analysis, ensuring that the battery cell 100 operates within a safe range. Furthermore, the battery information collector 200 can transmit key information such as the battery cell 100's capacity, remaining charge, and internal resistance to the battery management system in real time, assisting the battery management system in optimizing charging and discharging strategies. It can also monitor performance differences among different battery cells 100, assisting the battery management system in achieving balanced management and preventing shortened battery module 10 lifespan due to capacity imbalance. In addition, the battery information collector 200 monitors abnormal states such as overcharging, over-discharging, and high temperature in real time, triggering protection mechanisms and notifying the user to reduce safety risks.

[0040] Figure 2 for Figure 1 A schematic diagram of the structure of a single cell in a battery module. (Refer to...) Figure 2 As shown, some battery packs used in new energy vehicles use "blade" shaped cells 100. These cells 100 are characterized by a large span in the length direction and a small span in the width and height directions. The positive electrode 110 and the negative electrode 120 are located at the two ends of the length direction of the cell 100, respectively.

[0041] Figure 3 for Figure 1 A partial side view of the battery module. (Refer to...) Figure 3 As shown, for a "blade" shaped cell 100 with a large span in the length direction and a small span in the other two directions, if the lines of the battery information collector 200 are led out through the positive and negative electrode plates 120, the wires will occupy the empty space inside the battery pack.

[0042] Therefore, the "blade"-shaped battery cell 100 allows the battery information collector 200 to be directly connected to the cell cover plate 101 at one end of the battery cell 100 along its length. The battery information collector 200 includes a circuit board 210 and a conductive sheet 220 (e.g., a nickel sheet). Conductive lines (e.g., copper foil) are laid inside the circuit board 210, and pads (not shown in the figure) are laid on the surface of the circuit board 210 and connected to the conductive lines. The conductive sheet 220 corresponds to the pads and is electrically conductive. The conductive sheet 220 is connected, for example, to the positive electrode 110 or the negative electrode 120 of the battery cell 100. In this way, the battery information collector 200 is directly connected to the battery cell 100 through the conductive sheet 220, eliminating the need for wiring, which saves costs and reduces space occupation.

[0043] For example, the battery information collector 200 can extend along the thickness direction of the battery cell 100, and the extension direction of the battery information collector 200 is consistent with the stacking direction of the battery cells 100 in the battery module 10. Multiple conductive sheets 220 can be spaced apart along the extension direction of the circuit board 210, and each conductive sheet 220 is electrically connected to each battery cell 100. This enables the battery information collector 200 to connect to each battery cell 100 in the battery module 10, and also helps to minimize the size of the battery information collector 200, reduce the space occupied by the battery information collector 200, and lower the cost of the battery information collector 200.

[0044] During vehicle use, the battery information collector 200 operates similarly to the circuit board 210 in other devices, with no significant differences in operating conditions. Furthermore, the battery information collector 200 itself requires fewer functions, resulting in a low probability of component failure. Unlike circuit boards in other fields, the charging and discharging of the power battery releases a large amount of heat, and may also lead to self-corrosion or cell 100 malfunction, resulting in electrolyte leakage. The electrolyte then flows within the battery pack to the vicinity of the battery information collector 200 and the cell 100.

[0045] The electrolyte is highly corrosive and will dissolve the potting compound inside the battery pack and the insulating layer on the surface of the battery information collector 200. The battery information collector 200 contains numerous circuits; without effective protection, a short circuit and arcing may occur between the electrolyte and charged metal parts inside the battery pack (or within the battery information collector 200 itself) after the electrolyte becomes conductive, potentially leading to thermal runaway of the battery cell 100 and seriously threatening the safety of passengers.

[0046] The battery information collector in the related technology uses FR-4, a laminate made of glass fiber as reinforcement, epoxy resin as the main filler, and copper foil as a conductor. Although epoxy resin and glass fiber have good flame-retardant and insulating properties, the substrate of the battery information collector can still be severely corroded and its insulation properties compromised in the event of electrolyte leakage inside the battery pack. Consequently, not only can a short circuit occur inside the battery information collector, but severe short circuits may also lead to arcing at the connection point between the collector and the battery cell 100, causing the battery cell 100 to run away uncontrollably.

[0047] Meanwhile, the surface of the battery information collector has exposed areas such as test points and metal pads, which are prone to short circuits in liquid environments, affecting its normal operation. Therefore, a layer of conformal coating is usually applied to the surface of the battery information collector where there are components as an insulating medium. Conformal coatings can be made of acrylic, silicone, or polyurethane, and can provide moisture and water resistance, protecting the board components to a certain extent. However, on the one hand, conformal coatings can be corroded by electrolytes, and on the other hand, the thickness of conformal coatings is relatively thin and cannot cover the entire area of ​​the circuit board. Therefore, they are not effective in the high-temperature electrolyte environment where heat diffusion is required.

[0048] As described in the background section, the battery information collector is typically soldered to the cell cover 101 via a conductive sheet 220, and in related technologies, the conductive sheet 220 is connected to the circuit board 210 via solder. When a short circuit occurs in the circuit board 210 of the battery information collector 200, the overcurrent between the cell 100 and the circuit board 210 needs to be carried through the conductive sheet 220. However, the solder material between the conductive sheet 220 and the circuit board 210 is highly stable, low-cost, and not easily melted due to a short circuit. This can lead to the short circuit escalating and ultimately resulting in a system-level failure.

[0049] In view of this, the battery information collector 200 is improved in this application by providing a conductive adhesive layer between the conductive sheet 220 and the circuit board 210, using the conductive adhesive layer to connect the conductive sheet 220 to the circuit board 210. The adhesive layer's bonding and conductivity properties ensure the connection strength of the conductive sheet 220 and reliably conduct electricity between the conductive sheet 220 and the circuit board 210. Simultaneously, in electrolyte leakage or thermal diffusion environments, the conductive adhesive layer is more susceptible to corrosion and melting. Even if it doesn't melt, it will carbonize due to high-temperature burning, significantly increasing the impedance between the conductive sheet 220 and the circuit board 210 and noticeably reducing the current. This significantly reduces the severity of short circuits on the circuit board 210, lowers the risk of thermal runaway in the battery cell 100, and protects the system-level safety performance of the battery pack.

[0050] The battery information collector 200 provided in the embodiments of this application will be described in detail below.

[0051] Figure 4 This is a structural diagram of a battery information collector provided in an embodiment of this application. Figure 5 for Figure 4 Another structural diagram of the battery information collector. (Refer to...) Figure 4 and Figure 5 As shown, in the battery information collector 200, conductive sheets 220 can be connected to both long sides of the circuit board 210. The conductive sheets 220 are spaced apart along the long sides of the circuit board 210 and correspond to each battery cell 100, so as to realize the electrical connection between the battery information collector 200 and each battery cell 100 in the battery module 10 (e.g., ...). Figure 3 (As shown).

[0052] in, Figure 4 The main illustration shows the side of the circuit board 210 facing away from the battery cell 100. Figure 5 The diagram mainly shows the side of the circuit board 210 facing the battery cell 100. The conductive sheet 220 can be connected to the side of the circuit board 210 facing the battery cell 100, and the conductive sheet 220 can be bent. The conductive sheet 220 extends towards the battery cell 100 and is connected to the surface of the battery cell cover plate 101.

[0053] Figure 6 This is a schematic diagram of the structure of the conductive sheet provided in an embodiment of this application. (Refer to...) Figure 6 As shown, the conductive sheet 220 may include a first connecting portion 221, an extension portion 222, and a second connecting portion 223 connected in sequence. The first connecting portion 221 of the conductive sheet 220 is used to connect to the side of the circuit board 210 facing the battery cell 100, and the second connecting portion 223 of the conductive sheet 220 is used to connect to the surface of the battery cell cover plate 101. When the battery cell cover plates 101 of the circuit board 210 are parallel to each other, the first connecting portion 221 and the second connecting portion 223 of the conductive sheet 220 can be parallel to each other. The extension portion 222 connects between the first connecting portion 221 and the second connecting portion 223, and the extension portion 222 extends towards the battery cell cover plate 101 as a whole.

[0054] There is typically a gap between the circuit board 210 and the cell cover plate 101. This gap can be used to avoid components mounted on the side of the circuit board 210 facing the cell cover plate 101, and can also be used to avoid structures and components protruding from the surface of the cell cover plate 101. Therefore, the first connecting portion 221 and the second connecting portion 223 of the conductive sheet 220 are misaligned with each other. The height difference between them is used to compensate for the gap between the circuit board 210 and the cell cover plate 101, while the extension portion 222 of the conductive sheet 220 is used to compensate for the spatial misalignment between the first connecting portion 221 and the second connecting portion 223.

[0055] Thus, the conductive sheet 220 forms turning points between the first connecting portion 221 and the extension portion 222, and between the second connecting portion 223 and the extension portion 222. The conductive sheet 220 has higher structural strength and better reliability, and can better resist the vibration and displacement of the battery module 10.

[0056] Continue to refer to Figure 6 As an example, the extension 222 of the conductive sheet 220 may include a first segment 2221, a second segment 2222, and a third segment 2223 connected sequentially. The first segment 2221 is connected to the first connecting portion 221, the third segment 2223 is connected to the second connecting portion 223, and the second segment 2222 is connected between the first segment 2221 and the third segment 2223. The first segment 2221 may be perpendicular to the first connecting portion 221, and the third segment 2223 may be perpendicular to the second connecting portion 223. The first segment 2221 and the second segment 2222 are parallel to each other, and the second segment 2222 is perpendicular to both the first segment 2221 and the third segment 2223. Furthermore, from the end where the first segment 2221 is connected to the first connecting portion 221 to the end where the first segment 2221 is connected to the second segment 2222, the first segment 2221 extends in a direction away from the second connecting portion 223, and the third segment 2223 overlaps with the first segment 2221 in their planar direction.

[0057] With this configuration, the extension 222 of the conductive sheet 220 is U-shaped, and the first segment 2221 and the third segment 2223 of the extension 222 form elastic walls on both sides of the second segment 2222. An elastic deformation space is formed between the first segment 2221 and the third segment 2223 of the extension 222, and the second segment 2222 of the extension 222 can prevent the outward deformation of the first segment 2221 and the third segment 2223, resulting in higher overall torsional resistance of the extension 222. Furthermore, this improves the overall deformation resistance of the conductive sheet 220, leading to higher reliability and a longer service life.

[0058] Furthermore, since the first segment 2221 of the extension 222 in the conductive sheet 220 extends to the other side of the circuit board 210, the first segment 2221 of the extension 222 can abut against the side wall of the circuit board 210 (e.g., Figure 3 or Figure 4 (As shown). Furthermore, the first segment 2221 of the extension 222 can be used to limit the conductive sheet 220, which can realize the rapid connection of the conductive sheet 220, improve the installation accuracy of the conductive sheet 220, and also limit the deformation of the conductive sheet 220.

[0059] Of course, the conductive sheet 220 can also be designed in other ways depending on the installation position of the battery information collector 200 on the battery module 10, and this embodiment does not limit this. The conductive sheet 220 will be used as an example below. Figure 6 The following explanation uses the illustrated structure as an example.

[0060] Figure 7 This is a hierarchical structure diagram of a battery information collector provided in an embodiment of this application. (Refer to...) Figure 7 As shown in the figure, the cross-section of the battery information collector 200 at the connection between the conductive sheet 220 and the circuit board 210 is illustrated. Figure 6 Taking the conductive sheet 220 as an example, the connection point corresponds to the location of the first connection part 221 of the conductive sheet 220.

[0061] like Figure 7 As shown, the battery information collector 200 of this embodiment can still use FR-4 epoxy resin-based glass fiber reinforced material as the substrate of the circuit board 210 of the battery information collector 200. Furthermore, a layer of the aforementioned conformal coating can be applied to the surface of the circuit board 210 for protection. Further details will not be elaborated here.

[0062] In this embodiment, a conductive adhesive layer 230 is provided between the conductive sheet 220 and the pads on the circuit board 210, and the conductive sheet 220 is connected to the circuit board 210 through the conductive adhesive layer 230. On the one hand, the conductive adhesive layer 230 has good adhesive properties, which can ensure the connection strength of the conductive sheet 220, so that the conductive sheet 220 is firmly connected to the circuit board 210, ensuring the integrity and reliability of the battery information collector 200. On the other hand, the conductive adhesive layer 230 also has good conductivity, which can conduct electricity between the conductive sheet 220 and the conductive lines in the circuit board 210, so as to realize the signal transmission between the battery information collector 200 and the battery cell 100.

[0063] Meanwhile, in environments with electrolyte leakage or thermal runaway, the conductive adhesive is more susceptible to corrosion and melting. Even if the conductive adhesive does not melt, the remaining areas will carbonize due to high-temperature burning. Thus, in harsh environments such as electrolyte leakage and thermal runaway within the battery pack, the impedance between the conductive sheet 220 and the circuit board 210 will significantly increase and the current will decrease noticeably due to the melting or carbonization of the conductive adhesive. This can significantly reduce the severity of short circuits on the circuit board 210, lower the risk of thermal runaway in the cell 100, and protect the system-level safety performance of the battery pack.

[0064] The conductive adhesive layer 230 includes a matrix and conductive particles filled within the matrix. The matrix forms the main structure of the conductive adhesive layer 230, providing adhesion and serving as a carrier for the conductive particles. For example, the matrix can be a silicone-based resin or an epoxy-based resin. After curing, the matrix exhibits good bonding strength, ensuring the connection strength between the conductive sheet 220 and the circuit board 210. The conductive particles are conductors, and may include at least one of aluminum, copper, and silver. These particles can form conductive channels between the conductive sheet 220 and the circuit board 210, achieving electrical connection between them.

[0065] The thickness of the conductive adhesive layer 230 can be between 100μm and 1000μm. This ensures the conductive adhesive layer 230 is not too thin, providing sufficient thickness between the conductive sheet 220 and the circuit board 210 to guarantee the bonding strength of the conductive sheet 220, allowing it to be firmly connected to the circuit board 210. Simultaneously, the thickness of the conductive adhesive layer 230 is also not excessive, so as not to affect the connection between the other end of the conductive sheet 220 and the battery cell 100. Taking the conductive sheet 220 as an example... Figure 6 Taking the conductive sheet 220 shown as an example, if the thickness of the conductive adhesive layer 230 between the first connecting portion 221 of the conductive sheet 220 and the circuit board 210 is too large, the position of the second connecting portion 223 of the conductive sheet 220 will be too close to the cell cover plate 101, resulting in insufficient gap for solder to be formed between the second connecting portion 223 of the conductive sheet 220 and the cell cover plate 101, and may even cause the second connecting portion 223 of the conductive sheet 220 to deform.

[0066] For example, the thickness of the conductive adhesive layer 230 can be 100μm, 150μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm, 500μm, 550μm, or 600μm.

[0067] 650μm, 700μm, 750μm, 800μm, 850μm, 900μm, 950μm, 1000μm, etc.

[0068] To ensure the proper functioning of the components on circuit board 210, the curing temperature of the adhesive used in conductive adhesive layer 230 can be less than or equal to 100°C. This way, after the adhesive layer 230 is applied between conductive sheet 220 and circuit board 210, the curing temperature is maintained at less than or equal to 100°C during the curing process, preventing any impact on other components on circuit board 210. This avoids excessively high curing temperatures of conductive adhesive layer 230, which could burn out other components on circuit board 210 and cause the battery information collector 200 to malfunction.

[0069] In addition, the adhesive used in the conductive adhesive layer 230 can cure at room temperature for less than or equal to 24 hours. This results in high curing efficiency for the conductive adhesive layer 230, ensuring the production efficiency of the battery information collector 200.

[0070] Figure 8 This is a hierarchical structure diagram of another battery information collector provided in an embodiment of this application. (Refer to...) Figure 8 As shown, in addition to the conductive adhesive layer 230 connecting the conductive sheet 220 and the circuit board 210, the battery information collector 200 may also include a structural adhesive layer 240. After the conductive sheet 220 is connected to the circuit board 210 via the conductive adhesive layer 230, a structural adhesive layer 240 is then coated on the conductive sheet 220. The structural adhesive layer 240 is coated on the side of the conductive sheet 220 facing away from the pads and extends to both sides of the conductive sheet 220, so as to connect the conductive sheet 220 to the circuit board 210 via the structural adhesive layer 240.

[0071] By adding a structural adhesive layer 240 to the conductive sheet 220, the connection strength between the conductive sheet 220 and the circuit board 210 can be further increased, and the reliability of the battery information collector 200 is higher.

[0072] The structural adhesive layer 240 can be a polyurethane adhesive layer, meaning it can be made of polyurethane-based materials. Polyurethane-based materials are more easily corroded by electrolytes and have better leakage-breaking performance. Thus, when electrolyte leakage occurs inside the battery pack, the outer structural adhesive layer 240 is first corroded and broken by the electrolyte, allowing the electrolyte to quickly penetrate the conductive adhesive layer 230 between the conductive sheet 220 and the circuit board 210, thereby melting or carbonizing the conductive adhesive layer 230.

[0073] The thickness of the structural adhesive layer 240 can be between 500μm and 2000μm. This ensures that the structural adhesive layer 240 has sufficient thickness to provide the necessary bonding strength to the conductive sheet 220, guaranteeing a secure connection between the conductive sheet 220 and the circuit board 210. At the same time, the thickness of the structural adhesive layer 240 is not excessive, saving costs and preventing the conductive sheet 220 from forming a noticeable protrusion on the circuit board 210, thus improving the overall flatness of the circuit board 210.

[0074] For example, the thickness of the structural adhesive layer 240 can be 500 μm, 600 μm, 700 μm,

[0075] 800μm, 900μm, 1000μm, 1100μm, 1200μm, 1300μm, 1400μm,

[0076] 1500μm, 1600μm, 1700μm, 1800μm, 1900μm, 2000μm, etc.

[0077] In addition, in this embodiment, the surface of the conductive sheet 220 can also be sandblasted to give it a sandblasted surface. Sandblasting uses compressed air as power to form a high-speed jet that propels abrasive materials (copper ore sand, quartz sand, corundum, iron sand, sea sand) at high speed onto the surface of the workpiece, causing changes in its appearance or shape. Due to the impact and cutting action of the abrasive on the workpiece surface, the surface achieves a certain degree of cleanliness and varying roughness, improving the mechanical properties of the workpiece surface. This enhances the workpiece's fatigue resistance, increases its adhesion to the coating, extends the coating's durability, and also facilitates coating leveling and decoration.

[0078] Therefore, by forming the surface of the conductive sheet 220 into a sandblasted surface, the surface roughness of the conductive sheet 220 can be increased, the adhesion of the conductive adhesive layer 230 and the structural adhesive layer 240 to the sandblasted surface is better, the bonding force between the conductive adhesive layer 230 and the structural adhesive layer 240 and the conductive sheet 220 can be enhanced, and the leveling properties of the conductive adhesive layer 230 and the structural adhesive layer 240 are also better. Thus, the bonding strength between the conductive sheet 220 and the circuit board 210 can be enhanced.

[0079] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0080] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery information collector, characterized in that, include: Circuit board; Conductive sheet; A conductive adhesive layer is provided between the conductive sheet and the circuit board.

2. The battery information collector according to claim 1, characterized in that, The conductive adhesive layer includes a matrix and conductive particles filled in the matrix. The matrix includes silicone-based or epoxy resin-based materials, and the conductive particles include at least one of aluminum, copper, and silver.

3. The battery information collector according to claim 1, characterized in that, The thickness of the conductive adhesive layer is 100μm-1000μm.

4. The battery information collector according to claim 1, characterized in that, The curing temperature of the conductive adhesive layer is less than or equal to 100°C.

5. The battery information collector according to any one of claims 1-4, characterized in that, Also includes: A structural adhesive layer is applied to the side of the conductive sheet facing away from the circuit board, and the structural adhesive layer connects the conductive sheet and the circuit board.

6. The battery information collector according to claim 5, characterized in that, The structural adhesive layer is a polyurethane adhesive layer.

7. The battery information collector according to claim 5, characterized in that, The thickness of the structural adhesive layer is 500μm-2000μm.

8. The battery information collector according to any one of claims 1-4, characterized in that, The conductive sheet has a sandblasted surface.

9. A battery module, characterized in that, include: Multiple battery cells; The battery information collector according to any one of claims 1-8, wherein the conductive sheet of the battery information collector is connected to each of the battery cells.

10. A battery pack, characterized in that, It includes a housing and a plurality of battery modules as described in claim 9, wherein each of the battery modules is arranged within the housing.

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