Battery device and electric device

Abstract

The invention discloses a battery device and a power utilization device, the battery device comprises a box body, at least one battery monomer assembly and a battery management system, the battery monomer assembly is arranged in the box body, each battery monomer assembly comprises a battery pack, two end plates and a detection assembly, the battery pack comprises a plurality of battery monomers, and the battery management system is arranged in the box body. The two end plates are arranged on the two opposite sides of the battery pack respectively, the detection assembly is arranged on the end plates and used for detecting the deformation quantity of the end plates, the detection assembly comprises a light emitter and a light sensor, the light emitter is used for emitting light rays, the light sensor is used for sensing the light rays emitted by the light emitter, and the battery management system is arranged in the box body and electrically connected with the light sensor. According to the battery device provided by the embodiment of the invention, the deformation quantity of the end plate can be monitored, and the function of monitoring the expansion force of the battery pack and the early warning effect are achieved by monitoring the deformation quantity of the end plate; in addition, the whole end plate can have high structural strength.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In the related art, before multiple battery cells are loaded into a box, in order to facilitate the loading operation of multiple battery cells, multiple battery cells are usually assembled into at least one battery cell assembly. In order to suppress and restrain the deformation of the battery cells, end plates are set on opposite sides of the battery pack of the battery cell assembly. During the battery charging and discharging process, the battery cells will swell and deform, so that the battery pack as a whole has a certain expansion force. When the expansion force is too large, it will cause varying degrees of damage to the battery pack. Therefore, monitoring the expansion force of the battery pack has become an important research topic.

[0003] In the related art, in order to monitor the expansion force of the battery pack, a force sensor is usually arranged on the side of the end plate away from the battery pack, and the expansion force of the battery pack is transmitted to the force sensor through the end plate, so that the expansion force of the battery pack can be detected. In order to better transmit the expansion force of the battery pack to the force sensor, a mounting groove is arranged on the end plate, and the force sensor is arranged in the mounting groove, so that the thickness of the end plate between the battery pack and the force sensor can be reduced, so that the expansion force of the battery pack can be detected more accurately.

[0004] However, setting the mounting groove on the end plate will significantly reduce the local structural strength of the end plate, making the end plate less effective in restraining the expansion force of the battery cell assembly, and the end plate is easily damaged by the expansion force. Therefore, it is a technical problem to be solved to achieve high structural strength of the end plate while monitoring the expansion force of the battery pack. Summary of the invention

[0005] In view of the above problems, the present application provides a battery device and an electrical device, wherein the battery device can monitor the expansion force of a battery cell assembly by detecting the deformation of the end plate, and can make the end plate have a higher structural strength.

[0006] In a first aspect, the present application provides a battery device, comprising: a casing; at least one battery cell assembly, disposed in the casing, each of the battery cell assemblies comprising a battery pack, two end plates and a detection assembly, the battery pack comprising a plurality of battery cells, the two end plates being respectively disposed on opposite sides of the battery pack, the detection assembly being disposed on the end plates and used for detecting a deformation amount of the end plates, the detection assembly comprising a light emitter and a light sensor, the light emitter being used for emitting light, and the light sensor being used for sensing the light emitted by the light emitter; a battery management system, disposed in the casing and electrically connected to the light sensor.

[0007] In the above technical solution, by setting a detection component for detecting the deformation of the end plate on the end plate, since the expansion force of the battery pack affects the deformation of the end plate, the expansion force of the battery pack can be monitored by detecting the deformation of the end plate; and, by setting the detection component to include a light emitter and a light sensor, when the end plate is deformed due to the expansion force of the battery pack, the signal sensed by the light sensor will be different. For example, the deformation of the end plate will cause the light sensor to sense the light emitted by the light emitter or not sense the light emitted by the light emitter. The deformation of the end plate can be monitored by the signal sensed by the light sensor and the sensed signal is sent to the battery management system. By monitoring the deformation of the end plate, the function of monitoring the expansion force of the battery pack and the early warning effect are achieved; and, this monitoring method does not require the installation groove to be set on the end plate to realize the transmission of the expansion force of the battery pack to the sensor, so that the problem of significantly reduced local structural strength caused by setting the installation groove on the end plate can be avoided, and the end plate can have a higher structural strength as a whole, so that the end plate has a stronger restraining effect on the expansion force of the battery pack, and can also reduce or avoid the possibility of damage to the end plate due to the expansion force of the battery pack, which is conducive to extending the service life of the end plate.

[0008] In some embodiments, the light emitter and the light sensor provided on the same end plate are located on the same side in the thickness direction of the end plate, and the light sensor on the same end plate is oriented opposite to the light emitter and toward a side adjacent to each other.

[0009] In the above technical solution, the light emitter and the light sensor on the same end plate are located on the same side in the thickness direction of the end plate, which can facilitate the installation and integration of the detection component on the end plate; and, by the light sensor on the same end plate being oriented in the opposite direction to the light emitter and the light sensor and the light emitter on the same end plate being oriented toward the side adjacent to each other, the path of the light emitted from the light emitter to the light sensor is shortened, so that the deformation of the end plate can be detected more timely and accurately, which is beneficial to improving the detection accuracy of the detection component.

[0010] In some embodiments, the detection assembly is disposed on a side of the end plate facing away from the battery pack.

[0011] In the above technical solution, by arranging the detection component on the side of the end plate facing away from the battery pack, the detection component can be separated from the battery pack to avoid interference between the detection component and the battery pack; and, installing the detection component on the outer surface of the end plate facing away from the battery pack reduces the difficulty of installing the detection component and facilitates maintenance or replacement of the detection component.

[0012] In some embodiments, the projection position of the light emitter on the end plate along the thickness direction of the end plate is a first projection position, and the projection position of the light sensor on the end plate along the thickness direction of the end plate is a second projection position. The first projection position and the second projection position are arranged along a first direction, the first direction intersects with the thickness direction of the end plate, and the direction of the light sensor and the direction of the light emitter are both parallel to the first direction.

[0013] In the above technical solution, the first projection position of the light emitter on the end plate and the second projection position of the light sensor on the end plate are arranged along the first direction, the first direction intersects with the thickness direction of the end plate, and the orientation of the light sensor and the orientation of the light emitter are parallel to the first direction. When the end plate is deformed along the thickness direction of the end plate due to the expansion force of the battery pack, the relative position relationship between the light sensor and the light emitter will change, so that the propagation direction of the light is shifted along the thickness direction of the end plate or the light sensor is shifted along the thickness direction of the end plate. For example, when the light emitter and the light sensor are relatively arranged along the first direction, the light emitter can emit light along the first direction, and the light sensor senses the signal emitted by the light emitter. When the light emitter or the light sensor is offset along the thickness direction of the end plate, the light sensor and the light emitter are staggered, so that the signals received by the light sensor are different, thereby realizing the detection of the deformation amount of the end plate.

[0014] In some embodiments of the warning deformation amount, the end plate includes a first end plate area and a second end plate area, the first end plate area is located in the middle of the end plate, the second end plate area is located on the outer peripheral side of the first end plate area, one of the first projection position and the second projection position is located in the first end plate area, and the other of the first projection position and the second projection position is located in the second end plate area.

[0015] In the above technical solution, since the first end plate area is located in the middle, the deformation amount of the first end plate area along the thickness direction of the end plate is larger than that of the second end plate area located on the outer side of the first end plate area, so that the difference in deformation amount between the first end plate area and the second end plate area is larger. By having one of the first projection position and the second projection position located in the first end plate area and the other of the first projection position and the second projection position located in the second end plate area, one of the optical sensor and the optical emitter is located in the first end plate area, and the other of the optical sensor and the optical emitter is located in the second end plate area. When the end plate is deformed, the relative position between the optical sensor and the optical emitter can be changed, so that the signal sensed by the optical sensor is different. In this way, it can be detected whether the deformation amount of the end plate along the thickness direction of the end plate reaches the warning deformation amount, thereby realizing the monitoring and warning functions of the expansion force of the battery pack.

[0016] In some embodiments, the width dimension of the end plate in the first direction is L, the first projection position is located in the first end plate area, the distance between the first projection position and the center of the end plate is L1, and the ratio of L1 to L ranges from 0 to 10%.

[0017] In the above technical solution, the ratio of the distance L1 between the first projection position and the center of the end plate to the width dimension L of the end plate in the first direction is in the range of 0~10%. Since the center of the end plate is the area with the largest deformation of the end plate along the thickness direction of the end plate, the light emitter can be closer to the area with the largest deformation of the end plate to improve the detection accuracy and sensitivity of the detection component.

[0018] In some embodiments, the width dimension of the end plate in the first direction is L, the second projection position is located in the second end plate area, the distance between the second projection position and the outer edge of the end plate in the first direction is L2, and the ratio of L2 to L ranges from 0 to 10%.

[0019] In the above technical solution, the ratio of the distance L2 between the second projection position and the outer edge of the end plate to the width dimension L of the end plate in the first direction is in the range of 0~10%. Since the outer edge of the end plate is the area where the deformation of the end plate along the thickness direction of the end plate is the smallest, the optical sensor can be closer to the area where the deformation of the end plate is the smallest, so as to improve the detection accuracy and sensitivity of the detection component.

[0020] In some embodiments, the end plate includes a first end plate area and a second end plate area, the first end plate area is located in the middle of the end plate, the second end plate area is located on the outer peripheral side of the first end plate area, the first projection position and the second projection position are both located in the second end plate area, and the first projection position and the second projection position are located on opposite sides of the first end plate area along the first direction.

[0021] In the above technical scheme, since the first end plate area is located in the middle, the deformation of the first end plate area along the thickness direction of the end plate is larger than that of the second end plate area located on the outer side of the first end plate area, so that the difference in deformation between the first end plate area and the second end plate area is larger. By both the first projection position and the second projection position being located in the second end plate area, and the first projection position and the second projection position being located on opposite sides of the first end plate area along the first direction, the light emitter and the light sensor can be located in the second end plate area and the light emitter and the light sensor can be located on opposite sides of the first end plate area along the first direction. When the deformation of the first end plate area along the thickness direction of the end plate is small or no deformation occurs, the light sensor can sense the light emitted by the light emitter. When the deformation of the first end plate area along the thickness direction of the end plate is large, the transmission of light will be blocked, and the light sensor cannot sense the signal, so that the signal sensed by the light sensor is different. In this way, it can be detected whether the deformation of the end plate along the thickness direction of the end plate reaches the warning deformation, thereby realizing the monitoring and warning functions of the expansion force of the battery pack.

[0022] In some embodiments, the width dimension of the end plate in the first direction is L, the distance between the first projection position and the outer edge of the end plate in the first direction is L3, the distance between the second projection position and the outer edge of the end plate in the first direction is L4, the ratio of L3 to L is in the range of 20%~30%, and the ratio of L4 to L is in the range of 20%~30%.

[0023] In the above technical solution, the ratio of the distance L3 between the first projection position and the outer edge of the end plate in the first direction to the width dimension L of the end plate in the first direction is in the range of 20%~30%, and the ratio of the distance L4 between the second projection position and the outer edge of the end plate in the first direction to the width dimension L of the end plate in the first direction is in the range of 20%~30%. Since the outer edge of the end plate is the area where the deformation of the end plate along the thickness direction of the end plate is the smallest, the light emitter and the light sensor can be closer to the outer edge of the end plate, and the deformation at the positions of the light emitter and the light sensor is smaller than that at the center of the end plate. In this way, when the center of the end plate is deformed, a larger difference can be made between the deformation of the light emitter, the light sensor and the center of the end plate, which is beneficial to improving the detection accuracy and sensitivity of the detection component.

[0024] In some embodiments, the detection component disposed on a single end plate includes one light emitter and one light sensor.

[0025] In the above technical solution, the detection component arranged on a single end plate includes a light emitter and a light sensor. When the end plate is deformed due to the expansion force of the battery pack or there are deformations in different ranges, the signal sensed by the light sensor will be different. For example, the light sensor or the light emitter may be offset along the thickness direction of the end plate, resulting in changes in the relative positions between the light sensor, the light emitter and the end plate. In this way, the signal sensed by the light sensor may be different. Alternatively, when the deformation of the end plate is small, the light sensor may sense a signal. When the deformation of the end plate is large, at least part of the end plate will block the transmission of light, and the light sensor may not sense a signal. In this way, the signal sensed by the light sensor may be different, so that it can be detected whether the deformation of the end plate reaches the warning deformation, and the signal is transmitted to the battery management system through the light sensor, thereby achieving the function of monitoring the expansion force of the battery pack and the warning effect, and making the structure of the detection component simple.

[0026] In some embodiments, the detection component provided on a single end plate includes a light emitter and a plurality of light sensors, the plurality of light sensors on the single end plate are arranged along the thickness direction of the end plate, and the projections of the plurality of light sensors on the single end plate along the thickness direction of the end plate on the end plate are all located at the same projection position.

[0027] In the above technical solution, the detection component arranged on a single end plate includes a light emitter and multiple light sensors. The multiple light sensors on the single end plate are arranged along the thickness direction of the end plate, and the projections of the multiple light sensors on the single end plate along the thickness direction of the end plate on the end plate are all located at the same projection position. The multiple light sensors are at different distances from the end plate along the thickness direction of the end plate. In the process of the end plate deforming to a warning deformation amount along the thickness direction of the end plate, the multiple light sensors sequentially sense the light emitted by the light emitter along the thickness direction of the end plate and in the direction away from the battery pack. Corresponding to the expansion force of battery packs of different sizes, when the light sensor that is the farthest away from the end plate along the thickness direction of the end plate senses the light emitted by the light emitter, it can be determined that the deformation amount of the end plate is the warning deformation amount, and the function of process monitoring of the deformation of the end plate can be realized.

[0028] In some embodiments, a first mounting bracket and a second mounting bracket are provided on the side of the end plate facing away from the battery pack, and the first mounting bracket and the second mounting bracket are arranged along a first direction, and the first direction intersects with the thickness direction of the end plate. In the first direction, the light emitter is installed on the side of the first mounting bracket facing the second mounting bracket, and the light sensor is installed on the side of the second mounting bracket facing the first mounting bracket.

[0029] In the above technical solution, a first mounting bracket and a second mounting bracket are provided on the side of the end plate away from the battery pack, and the first mounting bracket and the second mounting bracket are arranged along a first direction. The first mounting bracket and the second mounting bracket can make the assembly of the light emitter and the light sensor on the end plate more convenient, and can also play a role in positioning the assembly of the light emitter and the light sensor on the end plate.

[0030] In some embodiments, at least one of the first mounting bracket and the second mounting bracket is integrally formed with the end plate.

[0031] In the above technical solution, by integrally forming at least one of the first mounting bracket and the second mounting bracket with the end plate, the structural strength of at least one of the first mounting bracket and the second mounting bracket and the end plate as a whole can be enhanced to a certain extent, and the assembly process between at least one of the first mounting bracket and the second mounting bracket and the end plate can be omitted, thereby improving the overall assembly efficiency of the battery device.

[0032] In some embodiments, the light emitter is an infrared emitter.

[0033] In the above technical solution, the light emitter is an infrared emitter, and the light emitted by the infrared emitter is infrared light. Infrared light can reduce or avoid the influence of visible light being greater than the detection result, thereby improving the accuracy and precision of the detection component.

[0034] In some embodiments, the light emitter is a laser emitter.

[0035] In the above technical solution, the light transmitter is a laser transmitter, and the light emitted by the laser transmitter is laser. Laser has good directionality, concentrated energy, and is not prone to dispersion during propagation, which can improve the accuracy and precision of the detection component.

[0036] In a second aspect, the present application provides an electrical device, including the battery device of the embodiment of the first aspect of the present application.

[0037] In the above technical solution, by providing the above battery device, the electrical device can have higher reliability and better performance.

[0038] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1is a schematic diagram of a battery cell assembly according to some embodiments of the present application; Figure 2 yes Figure 1 A schematic diagram of the assembly of the end plate and the detection assembly in the battery cell assembly; Figure 3 yes Figure 2 Sectional view along line AA; Figure 4 yes Figure 2 A schematic diagram of the assembly of the end plate and the detection assembly from another angle; Figure 5 yes Figure 2 A schematic diagram of partial assembly of an end plate and a detection assembly in a battery cell assembly, wherein the end plate is in a second state; Figure 6 is a partial assembly schematic diagram of an end plate and a detection assembly in a battery cell assembly according to some other embodiments of the present application, wherein the end plate is in a first state; Figure 7 yes Figure 6 A schematic diagram of partial assembly of an end plate and a detection assembly in a battery cell assembly, wherein the end plate is in a second state; Figure 8 is a partial assembly diagram of an end plate and a detection assembly in a battery cell assembly according to some other embodiments of the present application, wherein the end plate is in a first state; Fig. 9 yes Figure 8 A schematic diagram of partial assembly of an end plate and a detection assembly in a battery cell assembly, wherein the end plate is in a third state; Fig.10 yes Figure 8 A schematic diagram of partial assembly of an end plate and a detection assembly in a battery cell assembly, wherein the end plate is in a fourth state; Fig.11 yes Figure 8 A schematic diagram of partial assembly of an end plate and a detection assembly in a battery cell assembly, wherein the end plate is in a second state; Fig.12 is a schematic diagram of assembling an end plate and a detection assembly in a battery monomer assembly according to some further embodiments of the present application, wherein the end plate is in a first state; Fig.13 yes Fig.12 A schematic diagram of partial assembly of an end plate and a detection assembly in a battery cell assembly, wherein the end plate is in a second state; Fig.14 is a simplified schematic diagram of a battery device according to some embodiments of the present application; Fig.15 is a simplified schematic diagram of an electrical device according to some embodiments of the present application.

[0040] Reference numerals: 1000. Electrical devices; 100. Battery device; 10. Box body; 20. Detection component; 201. Light emitter; 202. Light sensor; 21, end plate; 211, first end plate area; 212, second end plate area; 213, first mounting bracket; 214, second mounting bracket; 30. Battery cell assembly; 31. Battery cell; 200. Car body. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0043] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0046] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0047] The term “plurality” used in this application refers to two or more (including two).

[0048] In the embodiments of the present application, unless otherwise specified, all implementation modes and optional implementation modes of the present application can be combined with each other to form a new technical solution.

[0049] In the embodiments of the present application, unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0050] In an embodiment of the present application, a battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include a plurality of battery cells, which are connected in series, in parallel, or in mixed connection through a busbar. For example, a battery cell assembly is usually formed by arranging a plurality of battery cells; a battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0051] The battery device may be a battery pack, which includes a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box. The battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box; the battery cell assembly may also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0052] In an embodiment of the present application, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery monomer assembly. The closed here means covering or closing, which can be sealed or unsealed. The first box may be a top cover or a bottom plate. For example, the box may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box to accommodate the battery monomer assembly.

[0053] In the embodiment of the present application, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0054] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material by charging after the battery cell is discharged; the battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application. The battery cell may be cylindrical, flat, rectangular or in other shapes, which is not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiments of the present application.

[0055] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0056] In the related art, before multiple battery cells are loaded into a box, in order to facilitate the loading operation of multiple battery cells, multiple battery cells are usually assembled into at least one battery cell assembly. In order to suppress and restrain the deformation of the battery cells, end plates are set on opposite sides of the battery pack of the battery cell assembly. During the battery charging and discharging process, the battery cells will swell and deform, so that the battery pack as a whole has a certain expansion force. When the expansion force is too large, it will cause varying degrees of damage to the battery pack. Therefore, monitoring the expansion force of the battery pack has become an important research topic.

[0057] In the related art, in order to monitor the expansion force of the battery pack, a force sensor is usually arranged on the side of the end plate away from the battery pack, and the expansion force of the battery pack is transmitted to the force sensor through the end plate, so that the expansion force of the battery pack can be detected. In order to better transmit the expansion force of the battery pack to the force sensor, a mounting groove is arranged on the end plate, and the force sensor is arranged in the mounting groove, so that the thickness of the end plate between the battery pack and the force sensor can be reduced, so that the expansion force of the battery pack can be detected more accurately.

[0058] However, providing a mounting groove on the end plate will significantly reduce the local structural strength of the end plate, resulting in poor restraint effect of the end plate on the expansion force of the battery cell assembly, and the end plate is easily damaged under the action of the expansion force.

[0059] Based on this, the present application proposes a battery device, including a case, a battery cell assembly and a battery management system. The battery cell assembly is arranged in the case and there is at least one battery cell assembly. Each battery cell assembly includes a battery pack, two end plates and a detection assembly. The battery pack includes multiple battery cells. The two end plates are respectively arranged on opposite sides of the battery pack. The detection assembly is arranged on the end plate and is used to detect the deformation of the end plate. The detection assembly includes a light emitter and a light sensor. The light emitter is used to emit light, and the light sensor is used to sense the light emitted by the light emitter. The battery management system is arranged in the case and is electrically connected to the light sensor.

[0060] In the above-mentioned battery cell, by setting a detection component for detecting the deformation of the end plate on the end plate, since the expansion force of the battery pack affects the deformation of the end plate, the expansion force of the battery pack can be monitored by detecting the deformation of the end plate; and, by setting the detection component to include a light emitter and a light sensor, when the end plate is deformed due to the expansion force of the battery pack, the signal sensed by the light sensor will be different. For example, the deformation of the end plate will cause the light sensor to sense the light emitted by the light emitter or not sense the light emitted by the light emitter. The deformation of the end plate can be monitored by the signal sensed by the light sensor and the sensed signal is sent to the battery management system. By monitoring the deformation of the end plate, the function of monitoring the expansion force of the battery pack and the early warning effect are achieved; and, this monitoring method does not require the installation groove to be set on the end plate to realize the transmission of the expansion force of the battery pack to the sensor, so that the problem of significantly reduced local structural strength caused by setting the installation groove on the end plate can be avoided, and the end plate can have a higher structural strength as a whole, so that the end plate has a stronger restraining effect on the expansion force of the battery pack, and the possibility of damage to the end plate due to the expansion force of the battery pack can be reduced or avoided, which is conducive to extending the service life of the end plate.

[0061] The battery device disclosed in the embodiments of the present application can be used in various energy storage systems that use the battery device as a power source or use the battery device as an energy storage element. In addition to being used in vehicles, the battery device can also be used for, but not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0062] The power-consuming device disclosed in the embodiments of the present application may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device is provided inside the vehicle, and the battery device may be provided at the bottom, head or tail of the vehicle. The battery device may be used to power the vehicle, for example, the battery device may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery device to power the motor, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery device may be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0063] Reference below Figure 1-Figure 14 A battery device 100 according to an embodiment of the present application is described.

[0064] refer to Figure 1-Figure 4 In the first aspect, the present application provides a battery device 100, including a housing 10, a battery cell assembly 30 and a battery management system. The battery cell assembly 30 is arranged in the housing 10 and there is at least one battery cell assembly 30. Each battery cell assembly 30 includes a battery pack, two end plates 21 and a detection assembly 20. The battery pack includes a plurality of battery cells 31. The two end plates 21 are respectively arranged on opposite sides of the battery pack. The detection assembly 20 is arranged on the end plate 21 and is used to detect the deformation of the end plate 21. The detection assembly 20 includes a light emitter 201 and a light sensor 202. The light emitter 201 is used to emit light, and the light sensor 202 is used to sense the light emitted by the light emitter 201. The battery management system is arranged in the housing 10 and the battery management system is electrically connected to the light sensor 202.

[0065] The light emitter 201 is used to emit light, and the light sensor 202 is used to sense the light received by the light emitter 201. According to different signals sensed by the light sensor 202, it can be detected whether the deformation of the end plate 21 reaches the warning deformation. Since the greater the deformation of the end plate 21 along the thickness direction of the end plate 21, the greater the expansion force of the battery pack, the light sensor 202 is electrically connected to the battery management system, which can facilitate the light sensor 202 to transmit signals to the battery management system, thereby achieving the function of monitoring the expansion force of the battery pack and the warning effect.

[0066] Furthermore, there is no need to consider the size of the end plate 21 along the thickness direction of the end plate 21, so that the end plate 21 can have a higher structural strength, so that the end plate 21 has a stronger restraining effect on the expansion force of the battery pack, and can also reduce or avoid the possibility of damage to the end plate 21 due to the expansion force of the battery pack, which is beneficial to extending the service life of the end plate 21.

[0067] For example, the thickness direction of the end plate 21 may refer to the Y direction in the drawings.

[0068] For example, the deformation of the end plate 21 may cause the optical sensor 202 or the optical emitter 201 to shift along the thickness direction of the end plate 21, resulting in a change in the relative position between the optical sensor 202, the optical emitter 201 and the end plate 21. This may cause the optical sensor 202 to sense a different signal. For example, when the deformation of the end plate 21 is small, the optical sensor 202 and the optical emitter 201 are arranged relative to each other, and the optical sensor 202 can sense the light emitted by the light emitter 201. When the deformation of the end plate 21 is large, the optical sensor 202 and the optical emitter 201 are staggered, so that the propagation direction of the light is shifted along the thickness direction of the end plate 21 or the optical sensor 202 is shifted along the thickness direction of the end plate 21, and the optical sensor 202 cannot sense the signal emitted by the light emitter 201.

[0069] For example, the end plate 21 has a first state and a second state. The deformation amount of the end plate 21 in the first state along the thickness direction of the end plate 21 is different from the deformation amount of the end plate 21 in the second state. When the end plate 21 is in the first state, the maximum deformation amount of the end plate 21 in the thickness direction of the end plate 21 is the first deformation amount. When the end plate 21 is in the second state, the maximum deformation amount of the end plate 21 in the thickness direction of the end plate 21 is the second deformation amount. The second deformation amount is greater than the first deformation amount. For example, the second deformation amount is a warning deformation amount. The signal sensed by the optical sensor 202 when the end plate 21 is in the first state is different from the signal sensed by the optical sensor 202 when the end plate 21 is in the second state.

[0070] Alternatively, when the deformation of the end plate 21 is small, the optical sensor 202 and the optical emitter 201 are staggered, and the optical sensor 202 cannot sense the signal emitted by the optical emitter 201. When the deformation of the end plate 21 is large, the staggered position relationship between the optical sensor 202 and the optical emitter 201 will become a relative setting, and the optical sensor 202 can sense the signal emitted by the optical emitter 201. Therefore, the difference in the signals sensed by the optical sensor 202 can be used to detect whether the deformation of the end plate 21 is a warning deformation.

[0071] For example, when the end plate 21 is in the first state, the light emitted by the light emitter 201 is within the sensing range of the light sensor 202, and when the end plate 21 is in the second state, the light emitted by the light emitter 201 exceeds the sensing range of the light sensor 202; or when the end plate 21 is in the second state, the light emitted by the light emitter 201 is within the sensing range of the light sensor 202, and when the end plate 21 is in the first state, the light emitted by the light emitter 201 exceeds the sensing range of the light sensor 202. The signal sensed by the light sensor 202 when the end plate 21 is in the first state is different from the signal sensed by the light sensor 202 when the end plate 21 is in the second state, so it can be more accurately detected whether the deformation amount of the end plate 21 reaches the warning deformation amount. Since the deformation amount of the end plate 21 can be used to represent the expansion force of the battery pack, it can be detected whether the expansion force of the battery pack reaches the expansion force that requires a warning.

[0072] For another example, when the deformation of the end plate 21 is small, the optical sensor 202 and the optical emitter 201 are arranged opposite to each other, and the optical sensor 202 can sense the signal. When the deformation of the end plate 21 is large, at least part of the end plate 21 will block the transmission of light, and the optical sensor 202 cannot sense the signal sent by the optical emitter 201. In this way, the signal sensed by the optical sensor 202 can be different, so as to detect whether the deformation of the end plate 21 reaches the warning deformation.

[0073] In the above technical solution, a detection component 20 for detecting the deformation of the end plate 21 is provided on the end plate 21. Since the expansion force of the battery pack affects the deformation of the end plate 21, the expansion force of the battery pack can be monitored by detecting the deformation of the end plate 21. Moreover, by configuring the detection component 20 to include a light emitter 201 and a light sensor 202, when the end plate 21 is deformed due to the expansion force of the battery pack, the signal sensed by the light sensor 202 will be different. For example, the deformation of the end plate 21 may cause the light sensor 202 to sense the light emitted by the light emitter 201 or not sense the light emitted by the light emitter 201. The sensor can sense the deformation of the end plate 21 and send the sensed signal to the battery management system, thereby monitoring the deformation of the end plate 21, thereby achieving the function of monitoring the expansion force of the battery pack and the early warning effect; moreover, this monitoring method does not need to set a mounting groove on the end plate 21 to realize the transmission of the expansion force of the battery pack to the sensor, which can avoid the problem of significantly reduced local structural strength caused by setting the mounting groove on the end plate 21, and can make the end plate 21 have a higher structural strength as a whole, so that the end plate 21 has a stronger restraining effect on the expansion force of the battery pack, and can also reduce or avoid the possibility of damage to the end plate 21 due to the expansion force of the battery pack, which is beneficial to extending the service life of the end plate 21.

[0074] refer to Figure 1-Figure 4 In some embodiments, the light emitter 201 and the light sensor 202 provided on the same end plate 21 are located on the same side in the thickness direction of the end plate 21, the direction of the light sensor 202 on the same end plate 21 is opposite to the direction of the light emitter 201, and the light sensor 202 and the light emitter 201 on the same end plate 21 are oriented toward the side adjacent to each other.

[0075] By locating the light emitter 201 and the light sensor 202 on the same end plate 21 on the same side in the thickness direction of the end plate 21, the installation and integration of the detection component 20 on the end plate 21 can be facilitated; and, by locating the light sensor 202 on the same end plate 21 in an opposite direction to the light emitter 201 and locating the light sensor 202 and the light emitter 201 on the same end plate 21 in a direction adjacent to each other, the path of the light emitted by the light emitter 201 to the light sensor 202 is shortened, so that the deformation of the end plate 21 can be detected more timely and accurately, which is beneficial to improving the detection accuracy of the detection component 20.

[0076] In the above technical solution, the light emitter 201 and the light sensor 202 on the same end plate 21 are located on the same side in the thickness direction of the end plate 21, so that the installation and integration of the detection component 20 on the end plate 21 can be facilitated; and, the light sensor 202 on the same end plate 21 is oriented opposite to the light emitter 201 and the light sensor 202 and the light emitter 201 on the same end plate 21 are oriented toward the side adjacent to each other, so that the path of the light emitted by the light emitter 201 to the light sensor 202 is shortened, so that the deformation of the end plate 21 can be detected more timely and accurately, which is beneficial to improving the detection accuracy of the detection component 20.

[0077] refer to Figure 1-Figure 4 In some embodiments, the detection assembly 20 is disposed on a side of the end plate 21 that is away from the battery pack.

[0078] By arranging the detection component 20 on the side of the end plate 21 facing away from the battery pack, the detection component 20 can be separated from the battery pack to avoid interference between the detection component 20 and the battery pack. For example, the influence of heat or battery interference inside the battery pack on the detection component 20 can be reduced, and the possibility of the battery pack blocking the detection component 20 can be reduced or avoided. In addition, installing the detection component 20 on the outer surface of the end plate 21 facing away from the battery pack reduces the difficulty of installing the detection component 20 and facilitates the maintenance or replacement of the detection component 20.

[0079] In the above technical solution, by arranging the detection component 20 on the side of the end plate 21 away from the battery pack, the detection component 20 can be separated from the battery pack to avoid interference between the detection component 20 and the battery pack; and, installing the detection component 20 on the outer surface of the end plate 21 away from the battery pack reduces the difficulty of installing the detection component 20 and facilitates the maintenance or replacement of the detection component 20.

[0080] refer to Figure 1-Figure 4 In some embodiments, the projection position of the light emitter 201 on the end plate 21 along the thickness direction of the end plate 21 is a first projection position, and the projection position of the light sensor 202 on the end plate 21 along the thickness direction of the end plate 21 is a second projection position. The first projection position and the second projection position are arranged along a first direction, the first direction intersects with the thickness direction of the end plate 21, and the orientation of the light sensor 202 and the orientation of the light emitter 201 are both parallel to the first direction.

[0081] For example, the first direction may refer to the X direction in the drawings.

[0082] The first projection position of the light emitter 201 on the end plate 21 and the second projection position of the light sensor 202 on the end plate 21 are arranged along the first direction, the first direction intersects with the thickness direction of the end plate 21, and the orientation of the light sensor 202 and the orientation of the light emitter 201 are parallel to the first direction. When the end plate 21 is deformed along the thickness direction of the end plate 21 due to the expansion force of the battery pack, the relative position relationship between the light sensor 202 and the light emitter 201 will change, so that the propagation direction of the light will be offset or Or the optical sensor 202 is offset along the thickness direction of the end plate 21. For example, when the light emitter 201 and the optical sensor 202 are arranged relative to each other along a first direction, the light emitter 201 can emit light along the first direction, and the optical sensor 202 senses the signal emitted by the light emitter 201. When the light emitter 201 or the optical sensor 202 is offset along the thickness direction of the end plate 21, the optical sensor 202 is staggered with the light emitter 201, so that the signals received by the optical sensor 202 are different, thereby realizing the detection of the deformation amount of the end plate 21.

[0083] In the above technical solution, the first projection position of the light emitter 201 on the end plate 21 and the second projection position of the light sensor 202 on the end plate 21 are arranged along the first direction, the first direction intersects with the thickness direction of the end plate 21, and the orientation of the light sensor 202 and the orientation of the light emitter 201 are parallel to the first direction. When the end plate 21 is deformed along the thickness direction of the end plate 21 due to the expansion force of the battery pack, the relative position relationship between the light sensor 202 and the light emitter 201 will change, so that the propagation direction of the light is along the thickness direction of the end plate 21. When an offset occurs or the optical sensor 202 is offset along the thickness direction of the end plate 21, for example, when the light emitter 201 and the optical sensor 202 are arranged relative to each other along a first direction, the light emitter 201 can emit light along the first direction, and the optical sensor 202 senses the signal emitted by the light emitter 201. When the light emitter 201 or the optical sensor 202 is offset along the thickness direction of the end plate 21, the optical sensor 202 is staggered with the light emitter 201, so that the signal received by the optical sensor 202 is different, thereby realizing the detection of the deformation amount of the end plate 21.

[0084] refer to Figure 5-Figure 7 In some embodiments, the end plate 21 includes a first end plate area 211 and a second end plate area 212, the first end plate area 211 is located in the middle of the end plate 21, the second end plate area 212 is located on the outer peripheral side of the first end plate area 211, one of the first projection position and the second projection position is located in the first end plate area 211, and the other of the first projection position and the second projection position is located in the second end plate area 212.

[0085] Since the first end plate area 211 is located in the middle, the deformation of the first end plate area 211 along the thickness direction of the end plate 21 is larger than that of the second end plate area 212 located on the outer side of the first end plate area 211, so that the difference in deformation between the first end plate area 211 and the second end plate area 212 is larger. When the first end plate area 211 and / or the second end plate area 212 is deformed, the relative position between the optical sensor 202 and the optical emitter 201 can be changed, so that the signal sensed by the optical sensor 202 is different, so that it can be detected whether the deformation of the end plate 21 along the thickness direction of the end plate 21 reaches the warning deformation, thereby realizing the monitoring and warning functions of the expansion force of the battery pack.

[0086] For example, the light sensor 202 may be located in the first end plate area 211, and the light emitter 201 may be located in the second end plate area 212. The first end plate area 211 has a first state and a second state. The deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the first state is different from the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the second state. When the first end plate area 211 is in the first state, the maximum deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 is the first deformation amount. When the first end plate area 211 is in the second state, the maximum deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 is the second deformation amount. The second deformation amount is greater than the first deformation amount. For example, the second deformation amount is a warning deformation amount.

[0087] When the first end plate area 211 is in a first state, the light emitted by the light emitter 201 can fall into the sensing range of the light sensor 202. When the first end plate area 211 is in a second state, since the light sensor 202 is offset along the thickness direction of the end plate 21 and toward the side away from the battery pack, the sensing range of the light sensor 202 is offset along the thickness direction of the end plate 21 and toward the side away from the battery pack, causing the light emitted by the light emitter 201 to exceed the sensing range of the light sensor 202. Therefore, it can be determined that the deformation of the first end plate area 211 is the second deformation, that is, the deformation of the first end plate area 211 reaches the warning deformation.

[0088] Correspondingly, when the first end plate area 211 is in the first state, the light emitted by the light emitter 201 exceeds the sensing range of the light sensor 202, and when the first end plate area 211 is in the second state, since the light sensor 202 is offset along the thickness direction of the end plate 21 and toward the side away from the battery pack, the sensing range of the light sensor 202 is offset along the thickness direction of the end plate 21 and toward the side away from the battery pack, causing the light emitted by the light emitter 201 to fall into the sensing range of the light sensor 202, thereby determining that the deformation amount of the first end plate area 211 is the second deformation amount, that is, the deformation amount of the first end plate area 211 reaches the warning deformation amount.

[0089] Correspondingly, the light emitter 201 may be located in the first end plate area 211, and the light sensor 202 may be located in the second end plate area 212. When the first end plate area 211 is deformed along the thickness direction of the end plate 21, the light emitter 201 is offset along the thickness direction of the end plate 21. The light sensor 202 detects the change in the propagation direction of the light emitted by the light emitter 201 to detect whether the deformation amount of the end plate 21 along the thickness direction of the end plate 21 reaches the warning deformation amount.

[0090] In the above technical solution, since the first end plate area 211 is located in the middle, compared with the second end plate area 212 located on the outer peripheral side of the first end plate area 211, the deformation of the first end plate area 211 along the thickness direction of the end plate 21 is larger, so that the difference in deformation between the first end plate area 211 and the second end plate area 212 is larger. When the end plate 21 is deformed, the relative position between the optical sensor 202 and the optical emitter 201 can be changed, so that the signal sensed by the optical sensor 202 is different. In this way, it is possible to detect whether the deformation of the end plate 21 along the thickness direction of the end plate 21 reaches the warning deformation, thereby realizing the monitoring and warning functions of the expansion force of the battery pack.

[0091] refer to Figure 3-Figure 5 In some embodiments, the width dimension of the end plate 21 in the first direction is L, the first projection position is located at the first end plate area 211, the distance between the first projection position and the center of the end plate 21 is L1, and the ratio of L1 to L ranges from 0 to 10%.

[0092] For example, the ratio of L1 to L can be 0, 2%, 5%, 7%, or 10%. The ratio of the distance L1 between the first projection position and the center of the end plate 21 to the width dimension L of the end plate 21 in the first direction is in the range of 0 to 10%. Since the center of the end plate 21 is the area where the deformation of the end plate 21 along the thickness direction of the end plate 21 is the largest, the light emitter 201 can be brought closer to the area where the deformation of the end plate 21 is the largest, so as to improve the detection accuracy and sensitivity of the detection component 20.

[0093] In the above technical solution, the ratio of the distance L1 between the first projection position and the center of the end plate 21 to the width dimension distance L of the end plate 21 in the first direction is in the range of 0~10%. Since the center of the end plate 21 is the area where the deformation of the end plate 21 along the thickness direction of the end plate 21 is the largest, the light emitter 201 can be closer to the area where the deformation of the end plate 21 is the largest, so as to improve the detection accuracy and sensitivity of the detection component 20.

[0094] refer to Figure 3-Figure 5 In some embodiments, the width dimension of the end plate 21 in the first direction is L, the second projection position is located at the second end plate area 212, the distance between the second projection position and the outer edge of the end plate 21 in the first direction is L2, and the ratio of L2 to L ranges from 0 to 10%.

[0095] For example, the ratio of L2 to L can be 0, 2%, 5%, 7%, or 10%. The ratio of the distance L2 between the second projection position and the outer edge of the end plate 21 to the width dimension L of the end plate 21 in the first direction is in the range of 0 to 10%. Since the outer edge of the end plate 21 is the area where the deformation of the end plate 21 along the thickness direction of the end plate 21 is the smallest, the optical sensor 202 can be brought closer to the area where the deformation of the end plate 21 is the smallest, so as to improve the detection accuracy and sensitivity of the detection component 20.

[0096] In the above technical solution, the ratio of the distance L2 between the second projection position and the outer edge of the end plate 21 to the width dimension L of the end plate 21 in the first direction is in the range of 0~10%. Since the outer edge of the end plate 21 is the area where the deformation of the end plate 21 along the thickness direction of the end plate 21 is the smallest, this can make the optical sensor 202 closer to the area where the deformation of the end plate 21 is the smallest, so as to improve the detection accuracy and sensitivity of the detection component 20.

[0097] refer to Figure 3-Figure 5 In some embodiments, the width dimension of the end plate 21 in the first direction is L, the first projection position is located in the first end plate area 211, the distance between the first projection position and the center of the end plate 21 is L1, and the ratio range of L1 to L is 0~10%, the second projection position is located in the second end plate area 212, and the distance between the second projection position and the outer edge of the end plate 21 in the first direction is L2, and the ratio range of L2 to L is 0~10%.

[0098] The ratio of the distance L1 between the first projection position and the center of the end plate 21 to the width dimension L of the end plate 21 in the first direction is in the range of 0~10%, and the ratio of the distance L2 between the second projection position and the outer edge of the end plate 21 in the first direction to the width dimension L of the end plate 21 in the first direction is in the range of 0~10%. Since the center of the end plate 21 is the area where the deformation of the end plate 21 along the thickness direction of the end plate 21 is the largest, the light emitter 201 can be closer to the area where the deformation of the end plate 21 is the largest, and since the outer edge of the end plate 21 is the area where the deformation of the end plate 21 along the thickness direction of the end plate 21 is the smallest, the light sensor 202 can be closer to the area where the deformation of the end plate 21 is the smallest. When the end plate 21 is deformed, the difference between the offset of the light emitter 201 located in the first end plate area 211 along the thickness direction of the end plate 21 and the offset of the light sensor 202 located in the second end plate area 212 along the thickness direction of the end plate 21 is larger, which is beneficial to improving the detection accuracy and sensitivity of the detection component 20.

[0099] In the above technical solution, the ratio of the distance L1 between the first projection position and the center of the end plate 21 to the width dimension L of the end plate 21 in the first direction is in the range of 0~10%, so that the light emitter 201 can be closer to the area where the deformation of the end plate 21 is the largest, and the light sensor 202 can be closer to the area where the deformation of the end plate 21 is the smallest. When the end plate 21 is deformed, the difference between the offset of the light emitter 201 located in the first end plate area 211 along the thickness direction of the end plate 21 and the offset of the light sensor 202 located in the second end plate area 212 along the thickness direction of the end plate 21 is large, which is beneficial to improve the detection accuracy and sensitivity of the detection component 20.

[0100] refer to Figure 12-13 In some embodiments, the end plate 21 includes a first end plate area 211 and a second end plate area 212, the first end plate area 211 is located in the middle of the end plate 21, the second end plate area 212 is located on the outer peripheral side of the first end plate area 211, the first projection position and the second projection position are both located in the second end plate area 212, and the first projection position and the second projection position are located on opposite sides of the first end plate area 211 along the first direction.

[0101] Since the first end plate area 211 is located in the middle, the deformation amount of the first end plate area 211 along the thickness direction of the end plate 21 is larger than that of the second end plate area 212 located on the outer peripheral side of the first end plate area 211, so that the deformation amount difference between the first end plate area 211 and the second end plate area 212 is larger. By locating the first projection position and the second projection position in the second end plate area 212, and the first projection position and the second projection position in the first direction on opposite sides of the first end plate area 211, the light emitter 201 and the light sensor 202 can be located in the second end plate area 212 and the light emitter 201 and the light sensor 202 can be located in the second end plate area 212. Located on opposite sides of the first end plate area 211 along the first direction, when the deformation of the first end plate area 211 along the thickness direction of the end plate 21 is small or no deformation occurs, the optical sensor 202 can sense the light emitted by the light emitter 201. When the deformation of the first end plate area 211 along the thickness direction of the end plate 21 is large, the transmission of light will be blocked, and the optical sensor 202 cannot sense the signal, so that the signal sensed by the optical sensor 202 is different. In this way, it can be detected whether the deformation of the end plate 21 along the thickness direction of the end plate 21 reaches the warning deformation, thereby realizing the monitoring and warning functions of the expansion force of the battery pack.

[0102] For example, the first end plate area 211 has a first state and a second state. The deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the first state is different from the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the second state. When the first end plate area 211 is in the first state, the maximum deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 is the first deformation amount. When the first end plate area 211 is in the second state, the maximum deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 is the second deformation amount. The second deformation amount is greater than the first deformation amount, for example, the second deformation amount is the warning deformation amount. The distance between the optical sensor 202 and the second end plate area 212 along the thickness direction of the end plate 21 is the first distance. The distance between the optical emitter 201 and the second end plate area 212 along the thickness direction of the end plate 21 is the same as the distance between the optical sensor 202 and the second end plate area 212 along the thickness direction of the end plate 21, and the first distance is less than the second deformation amount.

[0103] When the first end plate area 211 is in a first state, the light emitted by the light emitter 201 can fall into the sensing range of the light sensor 202. When the first end plate area 211 is in a second state, the first end plate area 211 is deformed along the thickness direction of the first end plate area 211 and the deformation reaches the second deformation, so that at least part of the first end plate area 211 blocks the propagation of light, causing the light sensor 202 to be unable to sense the light emitted by the light emitter 201. Therefore, it can be determined that the deformation of the first end plate area 211 is the second deformation, that is, the deformation of the first end plate area 211 reaches the warning deformation.

[0104] In the above technical solution, since the first end plate area 211 is located in the middle, compared with the second end plate area 212 located on the outer peripheral side of the first end plate area 211, the deformation amount of the first end plate area 211 along the thickness direction of the end plate 21 is larger, so that the deformation amount difference between the first end plate area 211 and the second end plate area 212 is larger. By locating the first projection position and the second projection position in the second end plate area 212, and the first projection position and the second projection position on the opposite sides of the first end plate area 211 along the first direction, the light emitter 201 and the light sensor 202 can be located in the second end plate area 212 and the light emitter 201 and the light sensor 202 can be located in the second end plate area 212. The sensor 202 is located on opposite sides of the first end plate area 211 along the first direction. When the deformation of the first end plate area 211 along the thickness direction of the end plate 21 is small or no deformation occurs, the optical sensor 202 can sense the light emitted by the light emitter 201. When the deformation of the first end plate area 211 along the thickness direction of the end plate 21 is large, the transmission of light will be blocked, and the optical sensor 202 cannot sense the signal, so that the signal sensed by the optical sensor 202 is different. In this way, it can be detected whether the deformation of the end plate 21 along the thickness direction of the end plate 21 reaches the warning deformation, thereby realizing the monitoring and warning functions of the expansion force of the battery pack.

[0105] refer to Figure 12-13 In some embodiments, the width dimension of the end plate 21 in the first direction is L, the distance between the first projection position and the outer edge of the end plate 21 in the first direction is L3, the distance between the second projection position and the outer edge of the end plate 21 in the first direction is L4, the ratio of L3 to L is in the range of 20%~30%, and the ratio of L4 to L is in the range of 20%~30%.

[0106] For example, the ratio of the distance L3 between the first projection position and the outer edge of the end plate 21 in the first direction to the width dimension L of the end plate 21 in the first direction can be 20%, 23%, 25%, 27%, 30%, etc., and the ratio of the distance L4 between the second projection position and the outer edge of the end plate 21 in the first direction to the width dimension L of the end plate 21 in the first direction can be 20%, 23%, 25%, 27%, 30%, etc.

[0107] The ratio of the distance L3 between the first projection position and the outer edge of the end plate 21 in the first direction to the width dimension L of the end plate 21 in the first direction is in the range of 20%~30%, and the ratio of the distance L4 between the second projection position and the outer edge of the end plate 21 in the first direction to the width dimension L of the end plate 21 in the first direction is in the range of 20%~30%. Since the outer edge of the end plate 21 is the area where the deformation of the end plate 21 along the thickness direction of the end plate 21 is the smallest, the light emitter 201 and the light sensor 202 can be closer to the outer edge of the end plate 21. The distances between the first projection position and the second projection position and the outer edge of the end plate 21 are both close. Compared with the deformation of the center of the end plate 21, the deformation at the positions where the light emitter 201 and the light sensor 202 are located are smaller. In this way, when the center of the end plate 21 is deformed, a large difference can be made between the deformation of the light emitter 201, the light sensor 202 and the center of the end plate 21, which is beneficial to improving the detection accuracy and sensitivity of the detection component 20.

[0108] In the above technical solution, the ratio of the distance L3 between the first projection position and the outer edge of the end plate 21 in the first direction to the width dimension L of the end plate 21 in the first direction is in the range of 20%~30%, and the ratio of the distance L4 between the second projection position and the outer edge of the end plate 21 in the first direction to the width dimension L of the end plate 21 in the first direction is in the range of 20%~30%. Since the outer edge of the end plate 21 is the area where the deformation of the end plate 21 along the thickness direction of the end plate 21 is the smallest, the light emitter 201 and the light sensor 202 can be closer to the outer edge of the end plate 21. The distances between the first projection position and the second projection position and the outer edge of the end plate 21 are both closer. Compared with the deformation of the center of the end plate 21, the deformation at the positions where the light emitter 201 and the light sensor 202 are located is smaller. In this way, when the center of the end plate 21 is deformed, a large difference can be made between the deformation of the light emitter 201, the light sensor 202 and the center of the end plate 21, which is beneficial to improve the detection accuracy and sensitivity of the detection component 20.

[0109] refer to Figure 2 and Figure 3 In some embodiments, the detection assembly 20 disposed on a single end plate 21 includes a light emitter 201 and a light sensor 202 .

[0110] When the end plate 21 is deformed due to the expansion force of the battery pack or has deformation amounts in different ranges, the signal sensed by the optical sensor 202 will be different. For example, the optical sensor 202 or the optical emitter 201 may be offset along the thickness direction of the end plate 21, resulting in a change in the relative position between the optical sensor 202, the optical emitter 201 and the end plate 21. This may make the signal sensed by the optical sensor 202 different. Alternatively, when the deformation amount of the end plate 21 is small, the optical sensor 202 may sense a signal. When the deformation amount of the end plate 21 is large, at least part of the end plate 21 may block the transmission of light, and the optical sensor 202 may not sense a signal. This may make the signal sensed by the optical sensor 202 different, thereby detecting whether the deformation amount of the end plate 21 reaches the warning deformation amount, and transmitting a signal to the battery management system through the optical sensor 202, thereby achieving the function of monitoring the expansion force of the battery pack and the warning effect, and making the structure of the detection component 20 simple.

[0111] In the above technical solution, when the end plate 21 is deformed due to the expansion force of the battery pack or has deformation amounts in different ranges, the signal sensed by the optical sensor 202 will be different. For example, the optical sensor 202 or the optical emitter 201 may be offset along the thickness direction of the end plate 21, resulting in a change in the relative position between the optical sensor 202, the optical emitter 201 and the end plate 21. This may make the signal sensed by the optical sensor 202 different. Alternatively, when the deformation amount of the end plate 21 is small, the optical sensor 202 may sense a signal. When the deformation amount of the end plate 21 is large, at least part of the end plate 21 may block the transmission of light, and the optical sensor 202 may not sense a signal. This may make the signal sensed by the optical sensor 202 different, thereby detecting whether the deformation amount of the end plate 21 reaches the warning deformation amount, and transmitting a signal to the battery management system through the optical sensor 202, thereby achieving the function of monitoring the expansion force of the battery pack and the warning effect, and making the structure of the detection component 20 simple.

[0112] refer to Figure 8-Figure 11 In some embodiments, the detection component 20 provided on a single end plate 21 includes a light emitter 201 and a plurality of light sensors 202. The plurality of light sensors 202 on the single end plate 21 are arranged along the thickness direction of the end plate 21, and the projections of the plurality of light sensors 202 on the single end plate 21 along the thickness direction of the end plate 21 on the end plate 21 are all located at the same projection position.

[0113] The detection component 20 provided on a single end plate 21 includes a light emitter 201 and a plurality of light sensors 202. The plurality of light sensors 202 on the single end plate 21 are arranged along the thickness direction of the end plate 21, and the projections of the plurality of light sensors 202 on the single end plate 21 along the thickness direction of the end plate 21 on the end plate 21 are all located at the same projection position. The plurality of light sensors 202 have different distances from the end plate 21 along the thickness direction of the end plate 21. In the process in which the end plate 21 is deformed to a warning deformation amount along the thickness direction of the end plate 21, the plurality of light sensors 202 sequentially sense the light emitted by the light emitter 201 along the thickness direction of the end plate 21 and in a direction away from the battery pack. Corresponding to the expansion forces of battery packs of different sizes, when the light sensor 202 which is the farthest from the end plate 21 along the thickness direction of the end plate 21 senses the light emitted by the light emitter 201, it can be determined that the deformation amount of the end plate 21 is the warning deformation amount, and the function of monitoring the deformation process of the end plate 21 can be realized.

[0114] For example, the multiple light sensors 202 can be three light sensors 202, and the three light sensors 202 are arranged in sequence along the thickness direction of the end plate 21 and toward the side away from the battery and are respectively a first light sensor, a second light sensor, and a third light sensor. The first light sensor is located on the side of the second light sensor close to the end plate 21, and the third light sensor is located on the side of the second light sensor away from the end plate 21. Along the thickness direction of the end plate 21, the distances between the first light sensor, the second light sensor, and the third light sensor and the end plate 21 increase in sequence. In the process of the end plate 21 deforming along the thickness direction of the end plate 21 to the warning deformation amount, the end plate 21 exists in the second state, the third state, and the fourth state. The deformation amount of the end plate 21 along the thickness direction of the end plate 21 when it is in the second state is different from the deformation amount of the end plate 21 along the thickness direction of the end plate 21 when it is in the third state and the deformation amount of the end plate 21 along the thickness direction of the end plate 21 when it is in the fourth state. When the end plate 21 is in the third state, the maximum deformation amount of the end plate 21 along the thickness direction of the end plate 21 is the third deformation amount. When the end plate 21 is in the fourth state, the maximum deformation amount of the end plate 21 along the thickness direction of the end plate 21 is the fourth deformation amount. When the end plate 21 is in the second state, the maximum deformation amount of the end plate 21 along the thickness direction of the end plate 21 is the second deformation amount. The second deformation amount is greater than the fourth deformation amount, and the fourth deformation amount is greater than the third deformation amount.

[0115] When the first light sensor senses the light emitted by the light emitter 201, it indicates that the end plate 21 is in the third state. When the second light sensor senses the light emitted by the light emitter 201, it indicates that the end plate 21 is in the fourth state. When the third light sensor senses the light emitted by the light emitter 201, it indicates that the end plate 21 is in the second state. The light emitted by the light emitter 201 is sensed in sequence by the first light sensor, the second light sensor and the third light sensor, corresponding to the deformation amounts of the end plates 21 of different sizes, thereby detecting the expansion forces of battery packs of different sizes.

[0116] The end plate 21 includes a first end plate area 211 and a second end plate area 212, the first end plate area 211 is located in the middle of the end plate 21, the center of the end plate 21 is located in the first end plate area 211, the second end plate area 212 is located on the outer peripheral side of the first end plate area 211, the light emitter 201 is located in the first end plate area 211, and a plurality of light sensors 202 are located in the second end plate area 212, the first end plate area 211 has a first state, a second state, a third state and a fourth state, the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the first state, the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the second state, the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the third state, and the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the fourth state 1 are all different in the thickness direction. When the first end plate area 211 is in the first state, the maximum deformation of the first end plate area 211 along the thickness direction of the first end plate area 211 is the first deformation. When the first end plate area 211 is in the second state, the maximum deformation of the first end plate area 211 along the thickness direction of the first end plate area 211 is the second deformation. When the first end plate area 211 is in the third state, the maximum deformation of the first end plate area 211 along the thickness direction of the first end plate area 211 is the third deformation. When the first end plate area 211 is in the fourth state, the maximum deformation of the first end plate area 211 along the thickness direction of the first end plate area 211 is the fourth deformation. The second deformation is greater than the fourth deformation, the fourth deformation is greater than the third deformation, and the third deformation is greater than the first deformation. For example, the second deformation is the warning deformation.

[0117] When the first end plate area 211 is in the first state, the light emitted by the light emitter 201 exceeds the sensing range of the light sensor 202, that is, the light sensor 202 cannot sense a signal. In the process of the first end plate area 211 being converted from the first state to the second state, the first end plate area 211 is first converted to the third state, then converted to the fourth state, and then converted to the second state. The light emitter 201 gradually deviates along the thickness direction of the end plate 21 following the first end plate area 211, so that the light emitted by the light emitter 201 is sequentially sensed by the first light sensor, the second light sensor, and the third light sensor. When the first light sensor senses the light, the light emitter 201 is sensed by the first light sensor. When the light emitted by the light emitter 201 is sensed, it indicates that the first end plate area 211 is in the third state, and the deformation variable of the first end plate area 211 is the third deformation variable. When the second light sensor senses the light emitted by the light emitter 201, it indicates that the first end plate area 211 is in the fourth state, and the deformation variable of the first end plate area 211 is the fourth deformation variable. When the third light sensor senses the light emitted by the light emitter 201, it indicates that the first end plate area 211 is in the second state. At this time, it can be determined that the deformation variable of the first end plate area 211 is the second deformation variable, that is, the deformation variable of the first end plate area 211 reaches the warning deformation variable.

[0118] Correspondingly, the detection component 20 arranged on a single end plate 21 may include multiple light emitters 201 and a light sensor 202, and the multiple light emitters 201 on the single end plate 21 are arranged along the thickness direction of the end plate 21, and the projections of the multiple light emitters 201 on the single end plate 21 along the thickness direction of the end plate 21 on the end plate 21 are all located at the same projection position.

[0119] In the above technical solution, the detection component 20 provided on a single end plate 21 includes a light emitter 201 and a plurality of light sensors 202. The plurality of light sensors 202 on the single end plate 21 are arranged along the thickness direction of the end plate 21, and the projections of the plurality of light sensors 202 on the single end plate 21 along the thickness direction of the end plate 21 are all located at the same projection position. The plurality of light sensors 202 have different distances from the end plate 21 along the thickness direction of the end plate 21. In the process that the end plate 21 is deformed to a warning deformation amount along the thickness direction of the end plate 21, the plurality of light sensors 202 sequentially sense the light emitted by the light emitter 201 along the thickness direction of the end plate 21 and in a direction away from the battery pack. Corresponding to the expansion force of battery packs of different sizes, when the light sensor 202 which is the farthest from the end plate 21 along the thickness direction of the end plate 21 senses the light emitted by the light emitter 201, it can be determined that the deformation amount of the end plate 21 is the warning deformation amount, and the function of monitoring the deformation process of the end plate 21 can be realized.

[0120] refer to Figure 2-Figure 5In some embodiments, a first mounting bracket 213 and a second mounting bracket 214 are provided on a side of the end plate 21 facing away from the battery pack. The first mounting bracket 213 and the second mounting bracket 214 are arranged along a first direction, and the first direction intersects with the thickness direction of the end plate 21. In the first direction, the light emitter 201 is installed on a side of the first mounting bracket 213 facing the second mounting bracket 214, and the light sensor 202 is installed on a side of the second mounting bracket 214 facing the first mounting bracket 213.

[0121] A first mounting bracket 213 and a second mounting bracket 214 are provided on the side of the end plate 21 away from the battery pack. The first mounting bracket 213 and the second mounting bracket 214 are arranged along a first direction. The first mounting bracket 213 can make the assembly of the light emitter 201 on the end plate 21 more convenient, and can also play a role in positioning the assembly of the light emitter 201 on the end plate 21. By installing the light emitter 201 at different positions along the thickness direction of the end plate 21 on the first mounting bracket 213, the distance between the light emitter 201 and the end plate 21 along the thickness direction of the end plate 21 can be flexibly adjusted according to actual needs. The second mounting bracket 214 can make the assembly of the optical sensor 202 on the end plate 21 more convenient, and can also play a role in positioning the assembly of the optical sensor 202 on the end plate 21. By installing the optical sensor 202 at different positions along the thickness direction of the end plate 21 on the second mounting bracket 214, the distance between the optical sensor 202 and the end plate 21 along the thickness direction of the end plate 21 can be flexibly adjusted according to actual needs.

[0122] For example, the detection component 20 arranged on a single end plate 21 includes a light emitter 201 and three light sensors 202. The three light sensors 202 are arranged in sequence along the thickness direction of the end plate 21 and toward the side away from the battery and are respectively a first light sensor, a second light sensor, and a third light sensor. All three sensors are arranged on the second mounting bracket 214. The first light sensor is located on the side of the second light sensor close to the end plate 21, and the third light sensor is located on the side of the second light sensor away from the end plate 21.

[0123] Furthermore, in the first direction, the light emitter 201 is installed on the side of the first mounting bracket 213 facing the second mounting bracket 214, and the light sensor 202 is installed on the side of the second mounting bracket 214 facing the first mounting bracket 213, so that the path from the light emitted by the light emitter 201 to the light sensor 202 is shorter, so that the deformation of the end plate 21 can be detected more timely and accurately, which is beneficial to improving the detection accuracy of the detection component 20.

[0124] In the above technical solution, a first mounting bracket 213 and a second mounting bracket 214 are provided on the side of the end plate 21 away from the battery pack. The first mounting bracket 213 and the second mounting bracket 214 are arranged along a first direction. The first mounting bracket 213 and the second mounting bracket 214 can make the assembly of the light emitter 201 and the light sensor 202 on the end plate 21 more convenient, and can also play a role in positioning the assembly of the light emitter 201 and the light sensor 202 on the end plate 21.

[0125] refer to Figure 2-Figure 5 In some embodiments, at least one of the first mounting bracket 213 and the second mounting bracket 214 is integrally formed with the end plate 21 .

[0126] By integrally molding at least one of the first mounting bracket 213 and the second mounting bracket 214 with the end plate 21, the structural strength of at least one of the first mounting bracket 213 and the second mounting bracket 214 and the end plate 21 as a whole can be enhanced to a certain extent, and the assembly process between at least one of the first mounting bracket 213 and the second mounting bracket 214 and the end plate 21 can be omitted, thereby improving the overall assembly efficiency of the battery device 100.

[0127] For example, the first mounting bracket 213 and the end plate 21 may be integrally formed; the second mounting bracket 214 and the end plate 21 may be integrally formed; or the first mounting bracket 213 and the second mounting bracket 214 and the end plate 21 may be integrally formed.

[0128] In the above technical solution, by integrally forming at least one of the first mounting bracket 213 and the second mounting bracket 214 with the end plate 21, the structural strength of at least one of the first mounting bracket 213 and the second mounting bracket 214 and the end plate 21 as a whole can be enhanced to a certain extent, and the assembly process between at least one of the first mounting bracket 213 and the second mounting bracket 214 and the end plate 21 can be omitted, thereby improving the overall assembly efficiency of the battery device 100.

[0129] refer to Figure 2-Figure 5 In some embodiments, the light emitter 201 is an infrared emitter.

[0130] The light emitter 201 is an infrared emitter, and the light emitted by the infrared emitter is infrared light. Infrared light can reduce or avoid the influence of visible light being greater than the detection result, thereby improving the accuracy and precision of the detection component 20.

[0131] In the above technical solution, the light emitter 201 is an infrared emitter, and the light emitted by the infrared emitter is infrared light. Infrared light can reduce or avoid the influence of visible light being greater than the detection result, thereby improving the accuracy and precision of the detection component 20.

[0132] refer to Figure 2-Figure 5 In some embodiments, the light emitter 201 is a laser emitter.

[0133] The light emitter 201 is a laser emitter, and the light emitted by the laser emitter is laser. Laser has good directionality, concentrated energy, and is not prone to dispersion during propagation, which can improve the accuracy and precision of the detection component 20.

[0134] In the above technical solution, the light emitter 201 is a laser emitter, and the light emitted by the laser emitter is laser. Laser has good directionality, concentrated energy, and is not easy to disperse during propagation. This can improve the accuracy and precision of the detection component 20.

[0135] Correspondingly, the light emitter 201 can also be an infrared laser emitter. The light emitted by the infrared laser emitter has good directionality, concentrated energy, and is not easy to disperse during propagation. It can also reduce or avoid the impact of visible light being greater than the detection result, thereby improving the accuracy and precision of the detection component 20.

[0136] refer to Fig.14 and Fig.15 In a second aspect, the present application provides an electrical device 1000, comprising the battery device 100 of the embodiment of the first aspect of the present application.

[0137] The electric device 1000 may be a vehicle, and the battery device 100 may be installed at the bottom of the vehicle body 200 .

[0138] For example, the battery device 100 may be disposed at the bottom of the vehicle body 200 . When the battery device 100 is used in a vehicle, the up and down direction may refer to the Z direction in the drawings.

[0139] In the above technical solution, by providing the above battery device 100, the electrical device 1000 can have higher reliability and better performance.

[0140] Refer to the following Figure 1-Figure 13 A battery device 100 according to some embodiments of the present application is described.

[0141] Reference Figure 1-Figure 5In this embodiment, the battery device 100 includes a housing 10, a battery cell assembly 30 and a battery management system. The battery cell assembly 30 is in the housing 10 and there is at least one battery cell assembly 30. Each battery cell assembly 30 includes a battery pack, two end plates 21 and a detection assembly 20. The battery pack includes a plurality of battery cells 31. The two end plates 21 are respectively arranged on opposite sides of the battery pack. The detection assembly 20 is arranged on the end plate 21 and includes a light emitter 201 and a light sensor 202. The light emitter 201 is used to emit light, and the light sensor 202 is used to sense the light emitted by the light emitter 201. The battery management system is arranged in the housing 10 and is electrically connected to the light sensor 202.

[0142] The light emitter 201 and the light sensor 202 provided on the same end plate 21 are located on the same side in the thickness direction of the end plate 21 , and the light sensor 202 on the same end plate 21 faces in the opposite direction to the light emitter 201 and faces toward the side adjacent to each other.

[0143] The detection component 20 is arranged on the side of the end plate 21 away from the battery pack. The projection position of the light emitter 201 on the end plate 21 along the thickness direction of the end plate 21 is a first projection position, and the projection position of the light sensor 202 on the end plate 21 along the thickness direction of the end plate 21 is a second projection position. The first projection position and the second projection position are arranged along a first direction, and the first direction intersects with the thickness direction of the end plate 21. The direction of the light sensor 202 and the direction of the light emitter 201 are both parallel to the first direction.

[0144] The end plate 21 includes a first end plate area 211 and a second end plate area 212. The first end plate area 211 is located in the middle of the end plate 21, and the second end plate area 212 is located on the outer peripheral side of the first end plate area 211. The width dimension of the end plate 21 in the first direction is L, the first projection position is located in the first end plate area 211, the distance between the first projection position and the center of the end plate 21 is L1, and the ratio range of L1 to L is 0-10%, the second projection position is located in the second end plate area 212, the distance between the second projection position and the outer edge of the end plate 21 in the first direction is L2, and the ratio range of L2 to L is 0-10%.

[0145] A first mounting bracket 213 and a second mounting bracket 214 are provided on a side of the end plate 21 away from the battery pack. The first mounting bracket 213 and the second mounting bracket 214 are arranged along a first direction, and the first direction intersects with the thickness direction of the end plate 21. In the first direction, the light emitter 201 is mounted on a side of the first mounting bracket 213 facing the second mounting bracket 214, and the light sensor 202 is mounted on a side of the second mounting bracket 214 facing the first mounting bracket 213. At least one of the first mounting bracket 213 and the second mounting bracket 214 is integrally formed with the end plate 21. The light emitter 201 is an infrared emitter and / or the light emitter 201 is a laser emitter.

[0146] The end plate 21 has a first state and a second state. The deformation amount of the end plate 21 along the thickness direction of the end plate 21 in the first state is different from the deformation amount of the end plate 21 along the thickness direction of the end plate 21 in the second state. When the end plate 21 is in the first state, the maximum deformation amount of the end plate 21 along the thickness direction of the end plate 21 is the first deformation amount. When the end plate 21 is in the second state, the maximum deformation amount of the end plate 21 along the thickness direction of the end plate 21 is the second deformation amount. The second deformation amount is greater than the first deformation amount. For example, the second deformation amount is a warning deformation amount.

[0147] The light emitted by the light emitter 201 sensed by the light sensor 202 when the end plate 21 is in the first state is different from the light emitted by the light emitter 201 sensed by the light sensor 202 when the end plate 21 is in the second state. The distance between the light sensor 202 and the end plate 21 along the thickness direction of the end plate 21 is different from the distance between the light emitter 201 and the end plate 21 along the thickness direction of the end plate 21. When the end plate 21 is in the first state, the light emitted by the light emitter 201 exceeds the sensing range of the light sensor 202. When the end plate 21 is in the second state, the light emitter 201 is offset along the thickness direction of the end plate 21, and the light emitted by the light emitter 201 is within the sensing range of the light sensor 202. At this time, the deformation amount of the end plate 21 is the warning deformation amount, and the deformation amount of the end plate 21 can be more accurately detected as the warning deformation amount. Since the deformation amount of the end plate 21 can be used to represent the expansion force of the battery pack, it can be detected whether the expansion force of the battery pack reaches the expansion force that requires a warning.

[0148] Next, we will refer to Figure 6 and Figure 7 The battery device 100 of other embodiments of the present application is described. In this embodiment, the same parts as the above embodiment are not described again, and the above embodiment can be referred to, and the differences from the above embodiment are mainly described.

[0149] The distance between the light sensor 202 and the end plate 21 along the thickness direction of the end plate 21 is the same as the distance between the light emitter 201 and the end plate 21 along the thickness direction of the end plate 21. When the end plate 21 is in the first state, the light emitted by the light emitter 201 is within the sensing range of the light sensor 202. When the end plate 21 is in the second state, the light emitter 201 is offset along the thickness direction of the end plate 21, and the light emitted by the light emitter 201 exceeds the sensing range of the light sensor 202. At this time, the deformation of the end plate 21 is a warning deformation, and the deformation of the end plate 21 can be detected more accurately as a warning deformation.

[0150] Next, we will refer to Figure 8-Figure 11The battery device 100 of some other embodiments of the present application is described. In this embodiment, the same parts as the above embodiment are not described again, and the above embodiment can be referred to, and the differences from the above embodiment are mainly described.

[0151] The detection component 20 arranged on a single end plate 21 includes a light emitter 201 and multiple light sensors 202. The multiple light sensors 202 on the single end plate 21 are arranged along the thickness direction of the end plate 21, and the projections of the multiple light sensors 202 on the single end plate 21 along the thickness direction of the end plate 21 on the end plate 21 are all located at the same projection position.

[0152] The multiple light sensors 202 can be three light sensors 202, and the three light sensors 202 are arranged in sequence along the thickness direction of the end plate 21 and toward the side away from the battery, and are respectively a first light sensor, a second light sensor, and a third light sensor. The first light sensor is located on the side of the second light sensor close to the end plate 21, and the third light sensor is located on the side of the second light sensor away from the end plate 21. Along the thickness direction of the end plate 21, the distances between the first light sensor, the second light sensor, and the third light sensor and the end plate 21 increase in sequence. In the process of the end plate 21 deforming along the thickness direction of the end plate 21 to the warning deformation amount, the end plate 21 exists in the second state, the third state, and the fourth state. The deformation amount of the end plate 21 along the thickness direction of the end plate 21 when the end plate 21 is in the second state is different from the deformation amount of the end plate 21 along the thickness direction of the end plate 21 when the end plate 21 is in the third state and the deformation amount of the end plate 21 along the thickness direction of the end plate 21 when the end plate 21 is in the fourth state. When the end plate 21 is in the third state, the maximum deformation amount of the end plate 21 along the thickness direction of the end plate 21 is the third deformation amount. When the end plate 21 is in the fourth state, the maximum deformation amount of the end plate 21 along the thickness direction of the end plate 21 is the fourth deformation amount. When the end plate 21 is in the second state, the maximum deformation amount of the end plate 21 along the thickness direction of the end plate 21 is the second deformation amount. The second deformation amount is greater than the fourth deformation amount, and the fourth deformation amount is greater than the third deformation amount.

[0153] When the first light sensor senses the light emitted by the light emitter 201, it indicates that the end plate 21 is in the third state. When the second light sensor senses the light emitted by the light emitter 201, it indicates that the end plate 21 is in the fourth state. When the third light sensor senses the light emitted by the light emitter 201, it indicates that the end plate 21 is in the second state. The light emitted by the light emitter 201 is sensed in sequence by the first light sensor, the second light sensor and the third light sensor, corresponding to the deformation amounts of the end plates 21 of different sizes, thereby detecting the expansion forces of battery packs of different sizes.

[0154] The end plate 21 includes a first end plate area 211 and a second end plate area 212, the first end plate area 211 is located in the middle of the end plate 21, the center of the end plate 21 is located in the first end plate area 211, the second end plate area 212 is located on the outer peripheral side of the first end plate area 211, the light emitter 201 is located in the first end plate area 211, and the plurality of light sensors 202 are all located in the second end plate area 212, the first end plate area 211 has a first state, a second state, a third state and a fourth state, the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the first state, the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the second state, the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the third state, and the deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 in the fourth state The deformation amounts in the thickness direction of 211 are different. When the first end plate area 211 is in the first state, the maximum deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 is the first deformation amount. When the first end plate area 211 is in the second state, the maximum deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 is the second deformation amount. When the first end plate area 211 is in the third state, the maximum deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 is the third deformation amount. When the first end plate area 211 is in the fourth state, the maximum deformation amount of the first end plate area 211 along the thickness direction of the first end plate area 211 is the fourth deformation amount. The second deformation amount is greater than the fourth deformation amount, the fourth deformation amount is greater than the third deformation amount, the third deformation amount is greater than the first deformation amount, and the second deformation amount is the warning deformation amount.

[0155] When the first end plate area 211 is in the first state, the light emitted by the light emitter 201 exceeds the sensing range of the light sensor 202, that is, the light sensor 202 cannot sense a signal. In the process of the first end plate area 211 being converted from the first state to the second state, the first end plate area 211 is first converted to the third state, then converted to the fourth state, and then converted to the second state. The light emitter 201 gradually deviates along the thickness direction of the end plate 21 following the first end plate area 211, so that the light emitted by the light emitter 201 is sequentially sensed by the first light sensor, the second light sensor, and the third light sensor. When the first light sensor senses the light, the light emitter 201 is sensed by the first light sensor. When the light emitted by the light emitter 201 is sensed, it indicates that the first end plate area 211 is in the third state, and the deformation variable of the first end plate area 211 is the third deformation variable. When the second light sensor senses the light emitted by the light emitter 201, it indicates that the first end plate area 211 is in the fourth state, and the deformation variable of the first end plate area 211 is the fourth deformation variable. When the third light sensor senses the light emitted by the light emitter 201, it indicates that the first end plate area 211 is in the second state. At this time, it can be determined that the deformation variable of the first end plate area 211 is the second deformation variable, that is, the deformation variable of the first end plate area 211 reaches the warning deformation variable.

[0156] Next, we will refer to Fig.12 and Fig.13 The battery device 100 of some other embodiments of the present application is described. In this embodiment, the same parts as the above embodiment are not described again, and the above embodiment can be referred to, and the differences from the above embodiment are mainly described.

[0157] The first projection position and the second projection position are both located in the second end plate area 212, and the first projection position and the second projection position are located on opposite sides of the first end plate area 211 along the first direction. The width dimension of the end plate 21 in the first direction is L, the distance between the first projection position and the outer edge of the end plate 21 in the first direction is L3, the distance between the second projection position and the outer edge of the end plate 21 in the first direction is L4, the ratio of L3 to L is in the range of 20% to 30%, and the ratio of L4 to L is in the range of 20% to 30%.

[0158] The first end plate area 211 has a first state and a second state. The deformation amount of the first end plate area 211 in the first state along the thickness direction of the first end plate area 211 is different from the deformation amount of the first end plate area 211 in the second state along the thickness direction of the first end plate area 211. When the first end plate area 211 is in the first state, the maximum deformation amount of the first end plate area 211 in the thickness direction of the first end plate area 211 is the first deformation amount. When the first end plate area 211 is in the second state, the maximum deformation amount of the first end plate area 211 in the thickness direction of the first end plate area 211 is the second deformation amount. The second deformation amount is greater than the first deformation amount, and the second deformation amount is the warning deformation amount. The distance between the optical sensor 202 and the second end plate area 212 along the thickness direction of the end plate 21 is the first distance. The distance between the optical emitter 201 and the second end plate area 212 along the thickness direction of the end plate 21 is the same as the distance between the optical sensor 202 and the second end plate area 212 along the thickness direction of the end plate 21, and the first distance is less than the second deformation amount.

[0159] When the first end plate area 211 is in a first state, the light emitted by the light emitter 201 can fall into the sensing range of the light sensor 202. When the first end plate area 211 is in a second state, the first end plate area 211 is deformed along the thickness direction of the first end plate area 211 and the deformation reaches the second deformation, so that at least part of the first end plate area 211 blocks the propagation of light, causing the light sensor 202 to be unable to sense the light emitted by the light emitter 201. Therefore, it can be determined that the deformation of the first end plate area 211 is the second deformation, that is, the deformation of the first end plate area 211 reaches the warning deformation.

[0160] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0161] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: Box; A battery cell assembly, which is disposed in the box and is at least one, each of which includes a battery pack, two end plates, and a detection assembly, the battery pack includes a plurality of battery cells, the two end plates are respectively disposed on opposite sides of the battery pack, the detection assembly is disposed on the end plates and is used to detect the deformation of the end plates, the detection assembly includes a light emitter and a light sensor, the light emitter is used to emit light, and the light sensor is used to sense the light emitted by the light emitter; A battery management system is arranged in the box and is electrically connected to the optical sensor.

2. The battery device according to claim 1, characterized in that: The light emitter and the light sensor provided on the same end plate are located on the same side in the thickness direction of the end plate, and the light sensor on the same end plate faces a direction opposite to that of the light emitter and faces a side adjacent to each other.

3. The battery device according to claim 2, characterized in that: The detection assembly is arranged on a side of the end plate away from the battery pack.

4. The battery device according to claim 3, characterized in that: The projection position of the light emitter on the end plate along the thickness direction of the end plate is a first projection position, and the projection position of the light sensor on the end plate along the thickness direction of the end plate is a second projection position. The first projection position and the second projection position are arranged along a first direction, and the first direction intersects with the thickness direction of the end plate. The orientation of the light sensor and the orientation of the light emitter are both parallel to the first direction.

5. The battery device according to claim 4, characterized in that: The end plate includes a first end plate area and a second end plate area, the first end plate area is located in the middle of the end plate, the second end plate area is located on the outer peripheral side of the first end plate area, one of the first projection position and the second projection position is located in the first end plate area, and the other of the first projection position and the second projection position is located in the second end plate area.

6. The battery device according to claim 5, characterized in that: The width dimension of the end plate in the first direction is L, the first projection position is located in the first end plate area, the distance between the first projection position and the center of the end plate is L1, and the ratio range of L1 to L is 0~10%.

7. The battery device according to claim 5, characterized in that: The width dimension of the end plate in the first direction is L, the second projection position is located in the second end plate area, the distance between the second projection position and the outer edge of the end plate in the first direction is L2, and the ratio range of L2 to L is 0~10%.

8. The battery device according to claim 4, characterized in that: The end plate includes a first end plate area and a second end plate area, the first end plate area is located in the middle of the end plate, the second end plate area is located on the outer peripheral side of the first end plate area, the first projection position and the second projection position are both located in the second end plate area, and the first projection position and the second projection position are located on opposite sides of the first end plate area along the first direction.

9. The battery device according to claim 8, characterized in that: The width dimension of the end plate in the first direction is L, the distance between the first projection position and the outer edge of the end plate in the first direction is L3, the distance between the second projection position and the outer edge of the end plate in the first direction is L4, the ratio of L3 to L is in the range of 20%~30%, and the ratio of L4 to L is in the range of 20%~30%.

10. The battery device according to claim 4, characterized in that: The detection component arranged on a single end plate includes a light emitter and a light sensor.

11. The battery device according to claim 4, characterized in that: The detection component arranged on the single end plate includes a light emitter and a plurality of light sensors. The plurality of light sensors on the single end plate are arranged along the thickness direction of the end plate, and the projections of the plurality of light sensors on the single end plate along the thickness direction of the end plate on the end plate are all located at the same projection position.

12. The battery device according to claim 3, characterized in that: A first mounting bracket and a second mounting bracket are provided on the side of the end plate facing away from the battery pack, and the first mounting bracket and the second mounting bracket are arranged along a first direction, and the first direction intersects with the thickness direction of the end plate. In the first direction, the light emitter is installed on the side of the first mounting bracket facing the second mounting bracket, and the light sensor is installed on the side of the second mounting bracket facing the first mounting bracket.

13. The battery device according to claim 12, characterized in that: At least one of the first mounting bracket and the second mounting bracket is integrally formed with the end plate.

14. The battery device according to any one of claims 1 to 13, characterized in that: The light emitter is an infrared emitter; and / or the light emitter is a laser emitter.

15. An electrical device, characterized in that: A battery device comprising any one of claims 1-14.

Images