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 and a protective layer. The protective layer is coated on the surface of the circuit board, and the protective layer comprises an electrolyte-resistant coating. The battery information collector has better insulation performance, can prevent the battery information collector from being subjected to severe short circuit in a harsh environment, and improves the safety performance of the battery pack.

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 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 has better insulation performance, which can prevent the battery information collector from experiencing severe short circuits in harsh environments and improve the safety performance of the battery pack.

[0005] The first aspect of this application provides a battery information collector, comprising: a circuit board; a protective layer coated on the surface of the circuit board, the protective layer including an electrolyte-resistant coating.

[0006] In one possible implementation, the electrolyte-resistant coating includes one of a polyimide coating, a polyamide-imide coating, a polyacrylonitrile coating, and a polytetrafluoroethylene coating.

[0007] In one possible implementation, the thickness of the electrolyte-resistant coating is 100μm-2000μm.

[0008] In one possible implementation, the protective layer further includes a conformal coating, wherein the conformal coating and the electrolyte-resistant coating are stacked together.

[0009] In one possible implementation, the conformal coating is located between the electrolyte-resistant coating and the surface of the circuit board.

[0010] In one possible implementation, the conformal coating includes an acrylic coating, a silicone coating, or a polyurethane coating.

[0011] In one possible implementation, the protective layer completely covers the highest element on the surface of the circuit board.

[0012] In one possible implementation, the battery information collector further includes a conductive sheet connected to a pad on a circuit board, the conductive sheet being used to electrically connect the circuit board to the battery cell.

[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 battery modules as described above, wherein the battery modules are arranged inside the housing.

[0015] The battery information collector, battery module, and battery pack provided in this application protect the circuit board by coating the circuit board with a protective layer, including an electrolyte-resistant coating. This electrolyte-resistant coating remains stable in harsh environments such as those with electrolyte leakage and thermal runaway, without being corroded by the electrolyte. The electrolyte-resistant coating also acts as a stable insulating layer and has better temperature resistance, improving the insulation performance of the circuit board. This prevents severe short circuits in harsh environments, reduces the risk of thermal runaway in the battery cells, enhances the system-level safety performance of the battery pack, and protects the safety of passengers. 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 6 This 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 - Protective layer; 231 - Electrolyte resistant coating; 232 - Conformal coating. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Figure 3 for Figure 1 A partial side view of the battery module. (Refer to...) Figure 3 As shown, for a "blade"-shaped battery cell 100 with a large span in the length direction and a small span in the other two directions, if the wiring of the battery information collector 200 is led out through the positive and negative electrode plates 120, the wiring will be too long and will occupy the empty space inside the battery pack. Therefore, the battery information collector 200 can be directly connected to the battery cell cover plate 101 at one end of the length direction of the "blade"-shaped battery cell 100.

[0041] The battery information collector 200 includes a circuit board 210 and a conductive sheet 220 (e.g., a nickel sheet). The circuit board 210 has internal wiring, which may be made of copper foil, for example. Pads (not shown) are provided on the surface of the circuit board 210 and connect to the wiring. 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 negative electrode 120 of the battery cell 100. Thus, the battery information collector 200 is directly connected to the battery cell 100 via the conductive sheet 220, eliminating the need for wiring, saving costs and reducing space requirements.

[0042] For example, the circuit board 210 of 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 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.

[0043] 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).

[0044] in, Figure 4 The main illustration shows the side of the circuit board 210 facing away from the battery cell 100. Figure 5The 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Continue to refer to Figure 6As 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.

[0049] 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.

[0050] 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.

[0051] 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. This application embodiment does not limit this.

[0052] During vehicle use, the battery information collector 200 operates similarly to circuit boards 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, potentially leading to self-corrosion or cell 100 malfunction, which in turn causes electrolyte leakage. The electrolyte then flows within the battery pack to the vicinity of the battery information collector 200 and cell 100.

[0053] 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.

[0054] 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.

[0055] According to the general protection technology of circuit boards, a layer of conformal coating is usually applied to the surface of the circuit board of the battery information collector. The conformal coating can be made of acrylic ester, silicone or polyurethane, and has excellent insulation, moisture protection, leakage prevention, shock resistance, dust protection, corrosion resistance, aging resistance and corona resistance, which can meet the normal use requirements of the battery information collector.

[0056] However, conformal coatings are not resistant to high temperatures and electrolyte corrosion, and therefore do not provide adequate protection in electrolyte environments. Furthermore, the coverage area of ​​conformal coatings on the circuit board of the battery data acquisition device is limited, typically only covering the areas with electronic components, and the coating thickness is relatively thin. In the high-temperature environment of the battery pack, electrolyte leakage can cause the insulation performance of the circuit board surface of the battery data acquisition device to rapidly fail.

[0057] When the insulation on the circuit board of the battery information collector fails, the highly conductive electrolyte diffuses into the inner layers of the circuit board, causing a short circuit within the circuit. This results in a sudden increase in current, eventually leading to violent discharge or continuous heating. Under normal temperature and pressure conditions, the electrolyte can corrode the surface of the circuit board and penetrate the components at the board's ends within just a few hours, causing a severe short circuit. In severe cases, this can lead to thermal runaway between battery cells or the entire battery pack, threatening the safety of passengers.

[0058] In view of this, the embodiments of this application improve the battery information collector by coating the surface of the circuit board in the battery information collector with a protective layer, including an electrolyte-resistant coating, to protect the circuit board. The electrolyte-resistant coating can stably exist in harsh environments such as electrolyte leakage and thermal diffusion without being corroded by the electrolyte. The electrolyte-resistant coating can also serve as a stable insulating layer, and at the same time, it has better temperature resistance, which can improve the insulation performance of the circuit board of the battery information collector. This prevents the battery information collector from experiencing severe short circuits in harsh environments, reduces the risk of thermal runaway of the battery cells, improves the system-level safety performance of the battery pack, and protects the safety of drivers and passengers.

[0059] The battery information collector provided in the embodiments of this application will be described in detail below.

[0060] Figure 7 This is a hierarchical structure diagram of a battery information collector provided in an embodiment of this application. Figure 8 This is a hierarchical structure diagram of another battery information collector provided in an embodiment of this application. (Refer to...) Figure 7 and Figure 8 As shown in the embodiment of this application, the battery information collector 200 has a protective layer 230 coated on the surface of the circuit board 210. The protective layer 230 can cover the entire surface of the circuit board 210 to protect the circuit board 210, ensure the insulation performance of the surface of the circuit board 210, and meet the performance requirements of the circuit board 210 in terms of insulation, moisture-proof, dust-proof, corrosion-proof, anti-aging, and corona resistance.

[0061] It should be noted that when the protective layer 230 is said to cover the entire surface of the circuit board 210, it means that the protective layer 230 covers both sides of the circuit board 210 in the thickness direction, and the protective layer 230 is applied to the areas where the circuitry is laid out inside the circuit board 210. However, for locations that need to be exposed, such as connectors and test pads, the protective layer 230 can avoid these locations to meet the design requirements of the circuit board 210 and avoid affecting the assembly of the circuit board 210 with other components.

[0062] The aforementioned FR-4 epoxy resin-based, glass fiber reinforced material can still be used as the substrate for circuit board 210. Further details will not be elaborated here.

[0063] like Figure 7 As shown, the protective layer 230 coated on the surface of the circuit board 210 includes an electrolyte-resistant coating 231. The electrolyte-resistant coating 231 is not corroded by the electrolyte and can exist stably in the electrolyte environment. Furthermore, the electrolyte-resistant coating 231 has good high-temperature resistance. Therefore, when electrolyte leakage or high-temperature thermal diffusion occurs inside the battery pack, the electrolyte-resistant coating 231 will not be corroded or melted, and can still be stably bonded to the surface of the circuit board 210, still providing reliable insulation protection for the circuit board 210.

[0064] Therefore, by coating the surface of the circuit board 210 with an electrolyte-resistant coating 231, a stable insulating layer is formed on the surface of the circuit board 210. The electrolyte-resistant coating 231 can maintain the insulation performance of the circuit board 210 even under harsh conditions such as electrolyte leakage and high-temperature thermal diffusion inside the battery pack. This improves the insulation performance of the battery information collector 200, prevents severe short circuits in harsh environments, reduces the risk of thermal runaway of the battery cell 100, enhances the system-level safety performance of the battery pack, and protects the safety of passengers.

[0065] The electrolyte-resistant coating 231 includes one of the following: polyimide coating, polyamide-imide coating, polyacrylonitrile coating, and polytetrafluoroethylene coating. In other words, the material of the electrolyte-resistant coating 231 can be selected from polyimide (PI), polyamide-imide (PAI), polyacrylonitrile (PAN), and polytetrafluoroethylene (PTFE). These materials are all stable in electrolytes and have good high-temperature resistance, allowing them to be bonded to the surface of the circuit board 210 as a stable insulating layer, thus improving the stability and reliability of the surface insulation performance of the circuit board 210.

[0066] Of course, other materials not listed above that are stable in the electrolyte can also be selected to form the electrolyte-resistant coating 231. This application does not impose specific limitations in this regard.

[0067] The thickness of the electrolyte-resistant coating 231 can range from 100μm to 2000μm. This ensures sufficient coating thickness on the surface of the circuit board 210, forming a stable and reliable insulating layer. Furthermore, the sufficient thickness and amount of coating material ensure good leveling properties during the coating process. The electrolyte-resistant coating 231 uniformly covers the surface of the circuit board 210. This improves the reliability and smoothness of the electrolyte-resistant coating 231, ensuring its resistance to electrolyte corrosion and its stability even under high-temperature thermal diffusion conditions within the battery pack, thus enhancing the insulation performance of the battery information collector 200.

[0068] For example, the thickness of the electrolyte-resistant coating 231 can be 100μm, 200μm, 300μm, 400μm, 500μm, 600μm, 700μm, 800μm, 900μm, 1000μm, 1100μm, 1200μm, 1300μm, 1400μm, 1500μm, 1600μm, 1700μm, 1800μm, 1900μm, 2000μm, etc.

[0069] When the thickness of the electrolyte-resistant coating 231 is relatively small within the selectable range, for example, between 100μm and 1000μm, less coating material is used, which can reduce the production cost of the battery information collector 200. Simultaneously, the electrolyte-resistant coating 231 is lightweight, resulting in a lighter overall weight for the battery information collector 200, which is beneficial for its thinner and lighter design.

[0070] At this point, an electrolyte-resistant coating 231 can be applied to the surface of the circuit board 210 using a brush or spray coating process. The electrolyte-resistant coating 231 application process is simple and efficient. When the height of the tallest component on the surface of the circuit board 210 is relatively high, the thinner electrolyte-resistant coating 231 can cover only a portion of the tallest component. When the height of the tallest component on the surface of the circuit board 210 is relatively low, the thinner electrolyte-resistant coating 231 can completely cover the tallest component, thus providing reliable insulation protection for all components on the circuit board 210.

[0071] When the thickness of the electrolyte-resistant coating 231 is relatively large within the selectable range, for example, when the thickness of the electrolyte-resistant coating 231 is between 1000μm and 2000μm, more coating material is used for the electrolyte-resistant coating 231, resulting in better leveling performance and further improving the smoothness of the electrolyte-resistant coating 231. Furthermore, even if the tallest component on the surface of the circuit board 210 is relatively high, the electrolyte-resistant coating 231 can completely cover the tallest component, providing reliable insulation protection for all components on the circuit board 210.

[0072] At this point, a potting process can be used to enclose the surface of the circuit board 210 and pour the coating into the enclosed area to form a thick electrolyte-resistant coating 231 on the surface of the circuit board 210 in one go. Alternatively, the aforementioned brushing or spraying process can be used to coat the surface of the circuit board 210 with a thinner coating each time, and after multiple processes, a thick electrolyte-resistant coating 231 can be formed.

[0073] like Figure 8 As shown, in addition to the electrolyte-resistant coating 231, the surface of the circuit board 210 is also provided with a conformal coating 232. The conformal coating 232 and the electrolyte-resistant coating 231 are stacked together to form a protective layer 230.

[0074] As mentioned above, the conformal coating 232 can be made of acrylic, silicone, or polyurethane-based paints. In other words, the conformal coating 232 can be an acrylic coating, a silicone coating, or a polyurethane coating. The conformal coating 232 possesses superior insulation, moisture resistance, leakage prevention, shock resistance, dust resistance, corrosion resistance, aging resistance, and corona resistance properties, protecting the circuit board 210 from environmental corrosion.

[0075] By adding a conformal coating 232 to the electrolyte-resistant coating 231 to form a protective layer 230 on the surface of the circuit board 210, the electrolyte-resistant coating 231 and the conformal coating 232 provide double protection for the circuit board 210 and increase the thickness of the protective layer 230. This improves the protective effect of the protective layer 230, resulting in better stability and higher reliability. In the event of electrolyte leakage or high-temperature thermal runaway inside the battery pack, the surface of the circuit board 210, with its double protection, is less susceptible to corrosion or thermal melting, further enhancing its insulation performance. This reduces the risk of thermal runaway of the battery cell 100, improves the system-level safety performance of the battery pack, and protects the safety of passengers.

[0076] For example, such as Figure 8As shown, the conformal coating 232 can be located between the electrolyte-resistant coating 231 and the surface of the circuit board 210. That is, a conformal coating 232 is applied to the circuit board 210, and then an electrolyte-resistant coating 231 is applied over the conformal coating 232. Thus, the electrolyte-resistant coating 231 protects the outermost layer of the circuit board 210. Even under harsh conditions such as electrolyte leakage or high-temperature thermal diffusion, the outermost electrolyte-resistant coating 231 of the circuit board 210 has excellent resistance to electrolyte corrosion and high-temperature performance, preventing corrosion or thermal melting of the electrolyte-resistant coating 231, thereby providing stable protection for the internal conformal coating 232.

[0077] Of course, in other examples, the conformal coating 232 can also be placed on the outside of the electrolyte-resistant coating 231. In this way, under harsh conditions such as electrolyte leakage or high-temperature thermal diffusion, even if the outer conformal coating 232 is corroded or melted, exposing the inner electrolyte-resistant coating 231, the electrolyte corrosion resistance and high-temperature resistance of the electrolyte-resistant coating 231 can also prevent it from being corroded or melted, thus ensuring the protective performance of the protective layer 230.

[0078] When the protective layer 230 includes a laminated electrolyte-resistant coating 231 and a conformal coating 232, the protective layer 230 has a relatively large thickness. The relatively thick protective layer 230 can completely cover the tallest components on the circuit board 210, thereby providing reliable insulation protection for all components on the circuit board 210.

[0079] Taking the electrolyte-resistant coating 231 covering the conformal coating 232 as an example, the conformal coating 232 may cover part of the height of the highest component, while the electrolyte-resistant coating 231 may cover the remaining height of the highest component. Alternatively, the conformal coating 232 may cover part of the height of the highest component or the entire height of the highest component, with the conformal coating 232 covering the remaining height of the highest component or positioned above the highest component.

[0080] 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.

[0081] 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.

[0082] 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; A protective layer is coated on the surface of the circuit board, the protective layer including an electrolyte-resistant coating.

2. The battery information collector according to claim 1, characterized in that, The electrolyte-resistant coating includes one of the following: polyimide coating, polyamide-imide coating, polyacrylonitrile coating, and polytetrafluoroethylene coating.

3. The battery information collector according to claim 1, characterized in that, The thickness of the electrolyte-resistant coating is 100μm-2000μm.

4. The battery information collector according to any one of claims 1-3, characterized in that, The protective layer also includes a conformal coating, and the conformal coating and the electrolyte-resistant coating are stacked together.

5. The battery information collector according to claim 4, characterized in that, The conformal coating is located between the electrolyte-resistant coating and the surface of the circuit board.

6. The battery information collector according to claim 4, characterized in that, The conformal coating includes an acrylic coating, a silicone coating, or a polyurethane coating.

7. The battery information collector according to any one of claims 1-3, characterized in that, The protective layer completely covers the highest components on the surface of the circuit board.

8. The battery information collector according to any one of claims 1-3, characterized in that, Also includes: A conductive sheet is connected to the circuit board and is used to electrically connect the circuit board to the battery cell.

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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