Battery module

Abstract

The invention discloses a battery module. The battery module comprises a battery cell stacking body, a frame, a heating film and a cover plate, the frame forms a mounting space with an opening in the top, and the cell stack is arranged in the mounting space. The heating film is arranged at the top of the battery cell stacking body and is used for heating the battery cell stacking body. The cover plate covers the top of the frame, seals the opening and is attached to the side face, away from the battery cell stacking body, of the heating film. The heating film is arranged in the battery module and is directly arranged at the top of the battery cell stacking body, and heat generated by the heating film can be directly conducted to the battery cell stacking body, so that the loss in the heat conduction process is reduced, and the heating efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery devices, and particularly to a battery module. Background Art

[0002] In the field of battery technology, the performance and stability of battery modules are crucial for the operation of the entire battery system. In a low-temperature environment, the performance of the battery will significantly decline. For example, problems such as reduced charge and discharge efficiency of the battery and accelerated attenuation of the battery capacity seriously affect the use effect and lifespan of the battery. To solve these problems, a heating film is usually used to heat the battery to maintain the battery within an appropriate operating temperature range.

[0003] In the related art, the heating film is usually disposed outside the battery module. Since there is a certain distance between the heating film and the battery cells, heat needs to be transferred to the battery cells through media such as the battery module housing and the air inside the module. During this process, a large amount of heat is lost, resulting in low heating efficiency and making it difficult to quickly and effectively increase the temperature of the battery cells, unable to meet the requirements of the battery for quick start-up and normal operation in a low-temperature environment. Summary of the Invention

[0004] The main object of the present invention is to provide a battery module, aiming to solve the technical problem of low heating efficiency of the battery module in the related art.

[0005] To achieve the above-mentioned invention object, the present invention provides a battery module.

[0006] A battery module includes:

[0007] A battery cell stack;

[0008] A frame, the frame forms an installation space with an opening at the top, and the battery cell stack is disposed in the installation space;

[0009] A heating film, the heating film is disposed on the top of the battery cell stack, and the heating film is used to heat the battery cell stack; and

[0010] A cover plate, the cover plate covers the top of the frame and seals the opening, and the cover plate is attached to the side of the heating film facing away from the battery cell stack.

[0011] In one embodiment, a plurality of the heating films are provided, and the heating films are spaced apart and disposed on the top of the battery cell stack.

[0012] In one embodiment, the cover plate is provided with an exhaust port, and the exhaust port is located in the spaced space between two adjacent heating films.

[0013] In one embodiment, a plurality of exhaust ports are provided, and the plurality of exhaust ports are arranged along the length direction of the battery cell stack body and are arranged in multiple columns along the width direction of the battery cell stack body. A heating film is provided between every two adjacent columns of the exhaust ports.

[0014] In one embodiment, the battery cell stack body includes a plurality of battery cell bodies and a plurality of aluminum fins. The side surface of the battery cell body is attached to the aluminum fin, and the plurality of battery cell bodies and the plurality of aluminum fins are all arranged. The plurality of aluminum fins are arranged between adjacent battery cell bodies at intervals;

[0015] The heating film is disposed on the top of the aluminum fin.

[0016] In one embodiment, the frame includes a first end plate, a first side plate, a second end plate, and a second side plate that are connected. The first end plate and the second end plate are oppositely arranged, and the first side plate and the second side plate are oppositely arranged;

[0017] One side surface of the battery cell stack body is connected to the first end plate, and the other side surface is connected to the second end plate.

[0018] In one embodiment, the frame further includes a third end plate. The third end plate is disposed between the first end plate and the second end plate. One end of the third end plate is connected to the first side plate, and the other end is connected to the second side plate;

[0019] The heating film is disposed on the top of the battery cell stack body on both sides of the third end plate.

[0020] In one embodiment, the battery module further includes an insulating plate. The insulating plate is located on the top of the frame, and the insulating plate is attached to the side surface of the cover plate away from the heating film.

[0021] In one embodiment, the battery module further includes a positive terminal and a negative terminal. The positive terminal is disposed at one end of the frame, and the positive terminal is electrically connected to the battery cell stack body. The negative terminal is disposed at the other end of the frame, and the negative terminal is electrically connected to the battery cell stack body.

[0022] In one embodiment, the battery module further includes a flexible printed circuit board data collector. The flexible printed circuit board data collector is disposed on the frame, and the flexible printed circuit board data collector is electrically connected to the battery cell stack body. The flexible printed circuit board data collector is used to collect physical data of the battery cell stack body.

[0023] Advantageous effects:

[0024] The battery module of the present invention includes a battery cell stack, a frame, a heating film, and a cover plate. The frame forms an installation space with an opening at the top, and the battery cell stack is disposed within the installation space. The heating film is disposed on the top of the battery cell stack and is used to heat the battery cell stack. The cover plate is covered on the top of the frame and seals the opening, and the cover plate is attached to the side of the heating film facing away from the battery cell stack. The heating film is disposed inside the battery module, and the heating film is directly disposed on the top of the battery cell stack, so that the heat generated by the heating film can be directly conducted to the battery cell stack, reducing the loss during the heat conduction process and improving the heating efficiency. Description of the Drawings

[0025] Figure 1 is an exploded view of a battery module according to an embodiment of the present invention.

[0026] Figure 2 is a top view of a battery module according to an embodiment of the present invention.

[0027] Figure 3 is a schematic structural diagram of a flexible printed circuit data collector according to an embodiment of the present invention.

[0028] Figure 4 is a schematic structural diagram of a battery cell body and aluminum fins according to an embodiment of the present invention.

[0029] Wherein:

[0030] 100, battery cell stack; 110, battery cell body; 120, aluminum fins;

[0031] 200, frame; 210, first end plate; 220, first side plate; 230, second end plate; 240, second side plate; 250, third end plate;

[0032] 300, heating film;

[0033] 400, cover plate; 410, exhaust port;

[0034] 500, insulating plate;

[0035] 610, positive terminal; 620, negative terminal;

[0036] 700, flexible printed circuit data collector.

[0037] The realization, functional features, and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiments

[0038] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0042] As Figures 1 to 4As shown, in some embodiments, a battery module includes a battery cell stack 100, a frame 200, a heating film 300, and a cover plate 400. The frame 200 forms an installation space with an opening at the top, and the battery cell stack 100 is disposed within the installation space. The heating film 300 is disposed on the top of the battery cell stack 100, and the heating film 300 is used to heat the battery cell stack 100. The cover plate 400 covers the top of the frame 200 and seals the opening, and the cover plate 400 is attached to the side of the heating film 300 facing away from the battery cell stack 100. The heating film 300 is disposed inside the battery module, and the heating film 300 is directly disposed on the top of the battery cell stack 100. The heat generated by the heating film 300 can be directly conducted to the battery cell stack 100, reducing the loss during the heat conduction process and improving the heating efficiency.

[0043] Specifically, the battery cell stack 100, as the core component of the battery module, is stacked by multiple battery cells according to a preset rule. A battery cell is the basic unit for realizing the storage and release of electric energy, and its performance and quality directly affect the overall performance of the battery module, such as battery capacity, charge and discharge efficiency, cycle life, etc.

[0044] It should be noted that the heating film 300 is usually made of materials with good thermal conductivity and electrical insulation properties, such as polyester film (PET), polyimide film (PI), etc., and conductive lines are made on the film surface through processes such as printing and etching. When the heating film 300 is powered on, current passes through the conductive lines. Due to the existence of resistance, electrical energy is converted into heat energy, causing the temperature of the heating film 300 to rise, and then the heat is transferred to the battery cell stack 100 below, realizing the heating of the battery cell stack 100. By precisely controlling the heating power and heating time of the heating film 300, the temperature of the battery cell stack 100 can be maintained within a suitable operating range, thereby effectively improving the performance and reliability of the battery module in a low-temperature environment.

[0045] In some embodiments, multiple heating films 300 are provided, and the heating films 300 are spaced apart and disposed on the top of the battery cell stack 100.

[0046] It should be noted that in the heating system of the battery module, each heating film 300 can be an independent heating unit, and multiple heating films 300 jointly provide the heating function for the battery cell stack 100. When one of the heating films 300 fails, such as a broken conductive line or damaged heating material, resulting in the heating film 300 being unable to work properly, the other heating films 300 arranged at intervals can still maintain the normal heating function. These normally working heating films 300 can continue to transfer heat to the battery cell stack 100, so that the temperature of the battery cell stack 100 can still be maintained within a certain range, ensuring that the battery module can still operate normally to a certain extent, and avoiding the problem that the entire battery module heating system fails due to the failure of a single heating film 300, thereby affecting the performance and reliability of the battery module. With such a setting, the reliability and fault tolerance of the heating film 300 are improved, ensuring that the battery module can operate more stably and reliably in a complex and changeable usage environment.

[0047] Specifically, the cover plate 400 is disposed on the top of the frame 200 and seals the opening at the top of the frame 200. The cover plate 400 can protect components such as the battery cell stack 100 and the heating film 300 inside the battery module, preventing external dust, water vapor, impurities, etc. from invading the inside of the battery module and causing corrosion, short circuit and other damages to the battery cells and other components, thereby ensuring the cleanliness and stability of the internal environment of the battery module. The cover plate 400 and the frame 200 cooperate with each other to enhance the overall structural strength and sealing performance of the battery module. The cover plate 400 is usually made of the same or similar high-strength material as the frame 200 and is tightly fixed to the frame 200 by means of bolt connection, snap connection, welding, etc. to form a sealed integral structure. In addition, the cover plate 400 also covers the side surfaces of the multiple heating films 300 facing away from the battery cell stack 100, playing a role in fixing and protecting the heating films 300, preventing the heating films 300 from shifting, deforming or being damaged during the use of the battery module, thereby ensuring that the heating films 300 can work properly and stably transfer heat to the battery cell stack 100.

[0048] Specifically, the cover plate 400 can be a rectangular plate.

[0049] In some embodiments, the cover plate 400 is provided with an exhaust port 410, and the exhaust port 410 is located in the interval space between two adjacent heating films 300. The exhaust port 410 can quickly discharge the gas generated by the battery cells during thermal runaway, avoiding the problem of unsmooth exhaust, which may cause heat accumulation and spread to other normal battery cells.

[0050] It should be noted that the arrangement of the spaced space between the exhaust port 410 and the heating film 300 together constitutes the exhaust path of the battery cell stack 100. During the operation of the battery module, the heat generated by the battery cells will increase the temperature of the internal air, and the hot air will naturally rise and accumulate at the top of the battery cell stack 100. Due to the spaced arrangement of the heating films 300, a relatively concentrated air flow will be formed in the spaced space between the heating films 300 during the upward movement of the hot air. And the exhaust port 410 is exactly located within these spaced spaces, so that the hot air can be discharged out of the battery module along the exhaust port 410, thus forming a complete exhaust path from the battery cell stack 100 to the outside of the battery module.

[0051] This technical solution significantly improves the thermal management efficiency of the battery module by concentrating the heating and exhaust functions at the top of the battery cell stack 100. In terms of heating, the heating film 300 is directly arranged at the top of the battery cell stack 100, which can achieve rapid and efficient heating of the battery cells. This direct-contact heating method reduces the loss during the heat transfer process, improves the heating efficiency, enables the battery cells to reach the appropriate operating temperature in a shorter time, and thus meets the startup and normal operating requirements of the battery module in a low-temperature environment. In terms of exhaust, the exhaust port 410 is located in the spaced space between two adjacent heating films 300 and is directly connected to the hot air accumulation area at the top of the battery cell stack 100, forming an efficient exhaust path. When the hot air generated by the battery cell stack 100 rises to the top, it can quickly be discharged out of the battery module through the exhaust port 410. This rapid exhaust mechanism effectively avoids the accumulation of hot air inside the battery module and reduces the risk of damage to the battery cells and other components due to overheating. At the same time, by discharging the hot air in a timely manner, it can effectively maintain the operating temperature of the battery cells within an appropriate range, improving the performance and stability of the battery module. In addition, the collaborative design of heating and exhaust at the top makes the heat management inside the battery module more efficient and orderly. The hot air generated during the heating process can be discharged in a timely manner, providing a good environment for the new heating process and avoiding the problem of reduced heating efficiency caused by the accumulation of hot air. At the same time, the heat carried away during the exhaust process can also promote the redistribution of heat inside the battery module, making the temperature of the battery cells more uniform and further improving the performance and reliability of the battery module. This technical solution significantly improves the thermal management efficiency of the battery module by optimizing the layout of the heating and exhaust systems, forming an efficient exhaust path, and realizing the collaborative operation of heating and exhaust, providing a strong guarantee for the stable operation of the battery module under different environmental conditions.

[0052] Such as Figure 2As shown, in some embodiments, a plurality of exhaust ports 410 are provided. The plurality of exhaust ports 410 are arranged along the length direction of the battery cell stack 100 and are arranged in multiple columns along the width direction of the battery cell stack 100. A heating film 300 is provided between every two adjacent columns of exhaust ports 410. Specifically, the battery cell stack 100 can be rectangular. The heating film 300 can be long and rectangular.

[0053] The arrangement of the plurality of exhaust ports 410 can adapt to the rectangular battery cell stack 100, can comprehensively cover the hot air area at the top of the battery cell stack 100, and ensure that there is a corresponding exhaust channel for the hot air generated at each position, thereby improving the exhaust efficiency and comprehensiveness.

[0054] It should be noted that this arrangement can make the temperature of the battery module balanced to achieve efficient thermal management inside the battery module. During the operation of the battery module, there may be certain differences in the chemical reaction rates of the battery cells at different positions, resulting in uneven temperature distribution of the battery cells. At the same time, when the heating film 300 is working, the heat generated by it may also be uneven during the transfer process, further exacerbating the uneven temperature distribution of the battery cells. And this uneven temperature distribution may have an adverse impact on the performance and service life of the battery cells. For example, too high local temperature may cause problems such as decomposition of the electrolyte of the battery cell and accelerated aging of the electrode material, thereby reducing performance indicators such as the charge and discharge efficiency, capacity retention rate, and cycle life of the battery cell. The layout design of the plurality of exhaust ports 410 and the heating film 300 realizes the balanced control of the temperature inside the battery module and the optimization of thermal management. The plurality of exhaust ports 410 are distributed along the length and width directions of the battery cell stack 100 of the battery cell stack 100, and can timely discharge the high-temperature flue gas generated during the thermal runaway of the battery cell stack 100 at different positions, effectively control the working temperature of the battery cell stack 100, and avoid the problem of too high local temperature of the battery cell stack 100.

[0055] At the same time, the heating film 300 provided between every two adjacent columns of exhaust ports 410 can make the heat more evenly distributed around the battery cell stack 100 during the heating process. In addition, this layout design also improves the thermal management efficiency of the battery module by optimizing the exhaust path and the distribution of the heating area. The reasonable layout of the exhaust ports 410 enables the hot air to be quickly and smoothly discharged outside the battery module, reducing the accumulation time of the hot air inside, thereby improving the exhaust efficiency.

[0056] Specifically, the shapes and sizes of multiple exhaust ports 410 in the same column are the same. The shape of the exhaust port 410 can be an elliptical shape. The consistent shapes and sizes of the exhaust ports 410 in the same column are conducive to simplifying the production process. During the mold manufacturing process, only a mold for the exhaust port 410 with one shape and size needs to be made, and then the mold is reused for mass production, which greatly reduces the cost and complexity of mold manufacturing and improves production efficiency.

[0057] Specifically, each column of exhaust ports 410 is arranged in parallel. From the perspective of the internal space structure of the battery module, the battery cell stack 100 is usually in a regular shape, such as a cuboid. In this case, arranging the exhaust ports 410 in parallel along the length or width direction of the battery cell stack 100 can better adapt to the shape of the battery cell stack 100, fully cover the space at the top of the battery cell stack 100, and avoid problems such as poor exhaust or internal structure disorder caused by unreasonable space layout.

[0058] Specifically, a large amount of heat is generated during the operation of the battery cell stack 100. Due to the arrangement of the battery cells in the stack and the heat transfer characteristics, there are differences in the heat distribution at different positions of the battery cell stack 100. For example, in some battery module designs, the edge part of the battery cell stack 100 may have relatively good heat dissipation conditions and relatively less heat accumulation; while in the middle region, due to the relatively concentrated battery cells and relatively complex heat dissipation paths, there is relatively more heat accumulation. In view of the uneven heat distribution characteristics of the battery cell stack 100, exhaust ports 410 are provided on both sides and in the middle of the battery cell stack 100, which can better meet the heat dissipation requirements at different positions of the battery cell stack 100. The first column of exhaust ports 410 and the third column of exhaust ports 410 on both sides of the battery cell stack 100 can timely discharge the hot air generated at the edge part of the battery cell stack 100, avoiding the accumulation of hot air in the edge area, thereby ensuring the heat dissipation efficiency of the edge part of the battery cell stack 100. The second column of exhaust ports 410 in the middle of the battery cell stack 100 can specifically discharge the large amount of hot air accumulated in the middle region of the battery cell stack 100, effectively solving the problem of difficult heat dissipation in the middle region and ensuring the heat dissipation effect of the middle region of the battery cell stack 100. Through this layout method, the exhaust ports 410 can comprehensively cover the hot air at different positions of the battery cell stack 100, effectively improving the heat dissipation efficiency of the battery cell stack 100 and ensuring the thermal stability of the battery module during operation.

[0059] In some embodiments, the battery cell stack 100 includes a plurality of battery cell bodies 110 and a plurality of aluminum fins 120. The side surfaces of the battery cell bodies 110 are attached to the aluminum fins 120. The plurality of battery cell bodies 110 and the plurality of aluminum fins 120 are both arranged. The plurality of aluminum fins 120 are arranged at intervals between adjacent battery cell bodies 110. The heating film 300 is disposed on the top of the aluminum fins 120.

[0060] It should be noted that by disposing the heating film 300 on the top of the aluminum fins 120 and the close-fitting layout of the aluminum fins 120 and the battery cell bodies 110, the heating efficiency is significantly improved. The heating film 300 is in direct contact with the aluminum fins 120, and the heat generated by the heating film 300 can be quickly transferred to the aluminum fins 120, reducing the loss of heat during the transfer process. The aluminum fins 120 have good heat conduction performance and can quickly receive and transfer the heat to the battery cell bodies 110 in close contact with them. This direct and efficient heat transfer path enables the battery cell bodies 110 to absorb sufficient heat in a short time, reach an appropriate working temperature, and meet the requirement of the battery module for quick start-up in a low-temperature environment. Secondly, the plurality of aluminum fins 120 are arranged at intervals between adjacent battery cell bodies 110. This layout enables the heat to be transferred more evenly and quickly between the battery cell bodies 110. After the heating film 300 transfers the heat to the aluminum fins 120, the aluminum fins 120 can transfer the heat to the battery cell bodies 110 in close contact with them on both sides at the same time, avoiding the problem of excessive temperature difference of the battery cells caused by local heat accumulation or uneven heat dissipation, and ensuring the temperature uniformity and stability of the battery cells during the heating process. At the same time, this uniform heat transfer method also helps to improve the heat absorption efficiency of the battery cell bodies 110, further improving the heating efficiency of the entire heating system and ensuring the stable and efficient operation of the battery module in a low-temperature environment.

[0061] In some embodiments, the frame 200 includes a first end plate 210, a first side plate 220, a second end plate 230, and a second side plate 240 that are connected to each other. The first end plate 210 and the second end plate 230 are disposed opposite to each other, and the first side plate 220 and the second side plate 240 are disposed opposite to each other. One side surface of the battery cell stack 100 is connected to the first end plate 210, and the other side surface is connected to the second end plate 230. The frame 200 provides stable support and protection for the battery cell stack 100. The first end plate 210, the first side plate 220, the second end plate 230, and the second side plate 240 of the frame 200 jointly construct an installation space structure, and the battery cell stack 100 is installed in this space.

[0062] Specifically, the battery cell stack 100 can be tightly attached to the first end plate 210 and the second end plate 230 by the pre-tightening force of extrusion and the adhesive force of the adhesive.

[0063] Specifically, the frame 200 is a cuboid frame structure. The connection methods of the first end plate 210, the first side plate 220, the second end plate 230, and the second side plate 240 can be welding, bolt connection, riveting, etc.

[0064] Specifically, the first end plate 210 and the second end plate 230 are arranged in parallel. The structures of the first end plate 210 and the second end plate 230 are the same. More specifically, the first side plate 220 and the second side plate 240 are arranged in parallel. The structures of the first side plate 220 and the second side plate 240 are the same.

[0065] In some embodiments, the frame 200 further includes a third end plate 250. The third end plate 250 is disposed between the first end plate 210 and the second end plate 230. One end of the third end plate 250 is connected to the first side plate 220, and the other end is connected to the second side plate 240. Heating films 300 are disposed on the tops of the battery cell stacks 100 on both sides of the third end plate 250. The third end plate 250 divides the internal space of the entire frame 200 into two or more relatively independent regions, such that the battery cell stacks 100 can be respectively arranged on both sides of the third end plate 250, and heating films 300 are disposed on the tops of the battery cell stacks 100 on both sides, realizing the arrangement mode of multiple heating films 300.

[0066] In some embodiments, the battery module further includes an insulating plate 500. The insulating plate 500 is located at the top of the frame 200 and is attached to the side of the cover plate 400 away from the heating film 300. The insulating plate 500 can be a mica plate. The mica plate can play an insulating and protective role. When a safety hazard such as a short circuit occurs in a certain battery cell, it can isolate the flame and reduce the impact on other normal battery cells.

[0067] The insulating plate 500 is attached to the side of the cover plate 400 away from the heating film 300. After local thermal runaway of the battery cell stack 100, when the high-temperature flue gas is discharged from the exhaust hole of the corresponding battery cell, it blocks the high-temperature flue gas that rebounds through the structure outside the module back to the cover plate 400 and the insulating plate 500; prevents the impact of the rebounding high-temperature flue gas on the cover plate 400, and the impact resistance and heat insulation performance of the insulating plate 500 are better than those of the cover plate 400; it can effectively protect the damage of the high-temperature flue gas generated by local thermal runaway of the battery cells to other normal battery cells, thereby reducing the probability of thermal diffusion. The cover plate 400, as the top covering component of the battery module, can protect the components inside the battery module from external environmental factors, such as dust, water vapor, sundries, etc. Below the cover plate 400, components such as the heating film 300 and the battery cell stack 100 are provided. The heating film 300 is used to provide additional heat for the battery cells in a low-temperature environment, so that the battery cells can operate within a suitable temperature range, thereby improving the performance of the battery module in a low-temperature environment.

[0068] The function of the insulating plate 500 in the battery module is to achieve electrical insulation. The insulating plate 500 is attached to the side of the cover plate 400 away from the heating film 300. This attachment relationship enables the insulating plate 500 to form an isolation layer between the cover plate 400 and the frame 200, effectively blocking possible current conduction paths, thereby achieving a good insulation effect. There is a complex circuit structure inside the battery module. During the charging and discharging process of the battery cells, a relatively high voltage will be generated. Without effective insulation measures, the current inside the battery module may leak, which will not only lead to a decline in the performance of the battery module, such as a reduction in charging and discharging efficiency and an accelerated attenuation of the battery capacity, but may also pose safety hazards.

[0069] During the operation of the battery stack, a large amount of heat will be generated in the battery cell stack 100 due to the charging and discharging chemical reactions. Excessive temperature will not only affect the performance of the battery cells, such as reducing the charging and discharging efficiency and accelerating the attenuation of the battery capacity, but may also cause safety problems, such as battery fire and explosion.

[0070] The insulating plate 500 has good high-temperature resistance. The insulating plate 500 can withstand the high temperature generated by the battery cell stack 100 and will not be quickly damaged or have its performance degraded due to high temperature. During the charging and discharging process of the battery cells, the insulating plate 500 always remains in the position between the top of the frame 200 and the cover plate 400, effectively blocking the heat generated by the battery cells from diffusing to the outside and reducing the disorderly diffusion of heat inside the battery module, thereby contributing to maintaining the relative stability of the temperature field inside the battery module.

[0071] In some embodiments, the battery module further includes a positive terminal 610 and a negative terminal 620. The positive terminal 610 is disposed at one end of the frame 200 and is electrically connected to the battery cell stack 100. The negative terminal 620 is disposed at the other end of the frame 200 and is electrically connected to the battery cell stack 100.

[0072] It should be noted that both the positive terminal 610 and the negative terminal 620 are electrically connected to the battery cell stack 100. The battery cell stack 100 is the core component of the battery module for realizing electrical energy storage and conversion, and is formed by stacking a plurality of battery cell bodies 110 in a specific arrangement. In the battery cell stack 100, the electrodes of the respective battery cell bodies 110 are connected by means such as welding, riveting or bolt connection to achieve electrical connection and coordinated operation between the battery cells. The positive terminal 610 is connected to the electrode part responsible for outputting the positive voltage in the battery cell stack 100, and the negative terminal 620 is connected to the electrode part responsible for outputting the negative voltage. This connection method ensures that during the charging and discharging process of the battery module, current can flow smoothly between the positive and negative terminals 620 and the battery cell stack 100.

[0073] In some embodiments, the battery module further includes a flexible printed circuit board data collector 700. The flexible printed circuit board data collector 700 is disposed on the frame 200, and the flexible printed circuit board data collector 700 is electrically connected to the battery cell stack 100. The flexible printed circuit board data collector 700 is used to collect physical data of the battery cell stack 100. Specifically, the flexible printed circuit board data collector 700 is an FPC collection device. A plurality of battery cell stacks 100 are electrically connected through a bus bar, and the bus bar is electrically connected to the flexible printed circuit board data collector 700.

[0074] The flexible printed circuit board data collector 700 can measure the voltage of the battery cell stack 100, so as to detect the charging state, health condition of the battery cell stack 100, and whether there is a risk of overcharging or over-discharging. The flexible printed circuit board data collector 700 can also measure the temperature of the battery cells by setting temperature sensors in the battery cell stack 100 and electrically connecting them to the collector. The temperature of the battery cells is one of the important factors affecting their performance and lifespan. Too high or too low temperature may lead to a decrease in the charge and discharge efficiency of the battery cells, an accelerated capacity decay, and even cause safety accidents. Therefore, by collecting the temperature data of the battery cells through the flexible printed circuit board, and based on the temperature data, the abnormal temperature situation of the battery cells can be detected in time, and corresponding measures can be taken for treatment to ensure that the battery cell stack 100 operates within an appropriate temperature range, improve the performance and lifespan of the battery cell stack 100, and ensure the safe and reliable operation of the battery module.

[0075] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A battery module, characterized in that: include: Battery cell stack; A frame, wherein the frame forms an installation space with an opening at the top, and the battery cell stack is arranged in the installation space; A heating film, the heating film is arranged on the top of the battery cell stack, and the heating film is used to heat the battery cell stack; and A cover plate is arranged on the top of the frame and seals the opening. The cover plate is attached to the side of the heating film away from the battery cell stack.

2. The battery module according to claim 1, characterized in that: The heating films are arranged in plurality and are arranged at intervals on the top of the battery cell stack.

3. The battery module according to claim 1, characterized in that: The cover plate is provided with an exhaust port, and the exhaust port is located in the interval space between two adjacent heating films.

4. The battery module according to claim 3, characterized in that: The exhaust ports are arranged in a plurality, and the plurality of exhaust ports are arranged in a row along the length direction of the battery cell stack and in a plurality of rows along the width direction of the battery cell stack. The heating film is arranged between each two adjacent rows of exhaust ports.

5. The battery module according to claim 1, characterized in that: The battery cell stack includes a plurality of battery cell bodies and a plurality of aluminum wings, the side surfaces of the battery cell bodies are attached to the aluminum wings, the plurality of battery cell bodies and the plurality of aluminum wings are arranged in an array, and the plurality of aluminum wings are arranged between adjacent battery cell bodies in an interval arrangement; The heating film is arranged on the top of the aluminum wing.

6. The battery module according to claim 1, characterized in that: The frame comprises a first end plate, a first side plate, a second end plate and a second side plate connected to each other, the first end plate is arranged opposite to the second end plate, and the first side plate is arranged opposite to the second side plate; One side surface of the battery cell stack is connected to the first end plate, and the other side surface is connected to the second end plate.

7. The battery module according to claim 6, characterized in that: The frame further includes a third end plate, which is disposed between the first end plate and the second end plate, one end of the third end plate being connected to the first side plate, and the other end of the third end plate being connected to the second side plate; The heating films are arranged on the tops of the battery cell stacks on both sides of the third end plate.

8. The battery module according to claim 1, characterized in that: The battery module further comprises an insulating plate, which is located on the top of the frame and attached to the side of the cover plate away from the heating film.

9. The battery module according to claim 1, characterized in that: The battery module further includes a positive terminal and a negative terminal, wherein the positive terminal is disposed at one end of the frame and is electrically connected to the battery cell stack, and the negative terminal is disposed at the other end of the frame and is electrically connected to the battery cell stack.

10. The battery module according to claim 1, characterized in that: The battery module further comprises a flexible circuit board data collector, which is arranged on the frame and electrically connected to the battery cell stack, and is used to collect physical data of the battery cell stack.

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