Battery device and electric equipment

Abstract

The utility model relates to the technical field of battery equipment, and discloses a battery device and electric equipment. The battery device comprises a box main body which is provided with a bottom wall and a circumferential enclosure wall, and the bottom wall and the circumferential enclosure wall define an assembly space; the plurality of single batteries are distributed on the bottom wall and accommodated in the assembling space, and at least part of the outer walls of every two adjacent single batteries abut against each other; and the pressure monitoring assembly is arranged in the assembling space, the pressure monitoring assembly comprises a first pressure sensor, and the first pressure sensor is installed on the circumferential inner wall of the circumferential enclosure bulkhead. By applying the technical scheme, the problems that the battery device only can estimate and judge the operation condition of the battery monomer and is difficult to intuitively, accurately and effectively monitor and judge whether the battery monomer has the hidden danger of thermal runaway or not by sampling but not limiting data of voltage, temperature and the like are solved.

Description

Technical Field

[0001] This application belongs to the technical field of battery devices, and particularly relates to a battery device and an electrical equipment. Background Art

[0002] With the continuous development of battery technology, the energy density requirements for battery devices are getting higher and higher, which is intuitively reflected in the more and more compact arrangement and installation of multiple battery cells in the box body. At the same time, the operating state of the battery device has also been increasingly valued by users.

[0003] Among the types of faults in battery devices, the thermal runaway of battery cells is one of the key faults to be prevented. In some cases, the battery device monitors the operating conditions of the battery device by sampling data such as voltage and temperature, so as to monitor and judge the operating state of the battery cells in the battery device. However, by sampling data such as voltage and temperature, only an estimated judgment of the operating conditions of the battery cells can be achieved, and it is difficult to intuitively, accurately, and effectively monitor and judge whether there is a hidden danger of thermal runaway in the battery cells. Utility Model Content

[0004] The purpose of this application is to provide a battery device and an electrical equipment, including but not limited to solving the problem that the battery device can only achieve an estimated judgment of the operating conditions of the battery cells by sampling data such as voltage and temperature, and it is difficult to intuitively, accurately, and effectively monitor and judge whether there is a hidden danger of thermal runaway in the battery cells.

[0005] To achieve the above purpose, according to the first aspect of the embodiments of this application, a battery device is provided, including:

[0006] A box body having a bottom wall and a circumferential enclosing wall, the bottom wall and the circumferential enclosing wall enclosing an assembly space;

[0007] Multiple battery cells distributed on the bottom wall and accommodated in the assembly space, at least part of the outer walls of adjacent two battery cells abutting against each other;

[0008] A pressure monitoring component disposed in the assembly space, the pressure monitoring component including a first pressure sensor, the first pressure sensor being installed on the circumferential inner wall of the circumferential enclosing wall, and the first pressure sensor abutting against at least part of the outer wall of the corresponding battery cell facing the circumferential inner wall;

[0009] The circumferential enclosing wall includes two opposite first side walls and two opposite second side walls, at least one first side wall and / or at least one second side wall includes an outer wall and an inner wall, an elastic member is provided between the outer wall and the inner wall, the elastic member abuts against the outer wall and the inner wall respectively, and the first pressure sensor is installed on the side of the inner wall facing the assembly space.

[0010] In the battery device provided by the embodiment of the present application, during the charging and discharging process of multiple battery cells that are in contact with each other, when an expansion force is generated inside any one of the battery cells, since at least a part of the outer walls of two adjacent battery cells among the multiple battery cells are in contact with each other, the expansion force will be continuously transmitted through the outer shell of the battery cell. And because the pressure monitoring component is in contact with at least a part of the outer wall of at least one battery cell, therefore, the expansion force will finally be transmitted and act on the pressure monitoring component, thus realizing the real-time monitoring of the expansion force of the battery cells in the battery device. That is to say, if an abnormal failure occurs in the battery cells of the battery device, such as thermal runaway, it will be intuitively characterized by the outward transmitted expansion force, and then the expansion force characterized will be monitored in real time and accurately by the pressure monitoring component, and the charging and discharging operation conditions of the battery cells of the battery device will be monitored, judged intuitively, accurately and effectively, so as to take corresponding countermeasures in time to repair and maintain the battery device, prevent the battery device from further occurring serious abnormal failures, contribute to improving the operating state of the battery device, and contribute to extending the service life of the battery device. And, the deformation of the elastic component is used to offset and balance the expansion force, so as to achieve the purpose of reducing the damage of the expansion force to the circumferential surrounding wall.

[0011] In some embodiments of the present application, the elastic component is a compression spring or an elastic filler.

[0012] In some embodiments of the present application, the pressure monitoring component includes a second pressure sensor. The box body further has at least one cross beam. The two ends of the cross beam are connected to the circumferential surrounding wall and are located in the assembly space. The second pressure sensor is installed on the side wall of the cross beam facing the battery cell, and the second pressure sensor is in contact with at least a part of the outer wall of the corresponding battery cell facing the cross beam. By combining the application of the second pressure sensor to monitor the expansion force in real time, the expansion force characterized can be monitored more accurately, so as to more accurately, effectively and timely predict the operating state of the battery device.

[0013] In some embodiments of the present application, the pressure monitoring component includes a third pressure sensor. Multiple battery cells are arranged to form multiple battery cell assemblies. Along the direction perpendicular to the extension direction of the battery cell assemblies, the multiple battery cell assemblies are arranged side by side, and a third pressure sensor is provided between two adjacent battery cell assemblies. The opposite sides of the third pressure sensor are respectively in contact with at least a part of the outer walls of the battery cells of the corresponding two adjacent battery cell assemblies. By combining the application of the third pressure sensor to monitor the expansion force in real time, the expansion force characterized can be monitored more accurately, so as to more accurately, effectively and timely predict the operating state of the battery device.

[0014] In some embodiments of the present application, the pressure monitoring component includes a fourth pressure sensor. In each battery cell component, a fourth pressure sensor is provided between two adjacent battery cells, and the fourth pressure sensor abuts against at least a part of the outer walls of the two battery cells that face each other. By combining the application of the fourth pressure sensor to monitor the expansion force in real time, the represented expansion force can be monitored more accurately, so as to predict the operating state of the battery device more accurately, effectively and in a timely manner.

[0015] In some embodiments of the present application, the battery device further includes a box cover, and the pressure monitoring component includes a fifth pressure sensor. The box cover covers the box body, the fifth pressure sensor is installed on the bottom wall, at least a part of the bottom of each battery cell abuts against the fifth pressure sensor, and the top of each battery cell abuts against the box cover. By combining the application of the fifth pressure sensor to monitor the expansion force in real time, the represented expansion force can be monitored more accurately, so as to predict the operating state of the battery device more accurately, effectively and in a timely manner.

[0016] In some embodiments of the present application, the pressure monitoring component is a pressure film sensor, that is, the first pressure sensor, the second pressure sensor, the third pressure sensor, the fourth pressure sensor and the fifth pressure sensor are all pressure film sensors.

[0017] According to the second aspect of the embodiments of the present application, there is provided an electrical device. The electrical device includes: an electrical load; and the battery device as described above, and the electrical load is electrically connected to the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic structural diagram of a battery cell of the battery device according to the embodiment of the present application;

[0020] Figure 2 Exploded view of the battery device according to the embodiment of the present application Figure 1 , in which the pressure monitoring component is not installed;

[0021] Figure 3 Top view of the box body of the battery device according to the embodiment of the present application with the first pressure sensor installed Figure 1 , in which the battery cells are not installed in the box;

[0022] Figure 4Schematic diagram of the structure of a battery cell, a first pressure sensor, and a second pressure sensor mounted on the box body of the battery device according to an embodiment of the present application, wherein the box body is provided with a cross beam;

[0023] Figure 5 For Figure 4 Enlarged schematic diagram at position A in;

[0024] Figure 6 Exploded schematic of the battery device according to an embodiment of the present application Figure 2 ;

[0025] Figure 7 For Figure 6 Enlarged schematic diagram at position B in;

[0026] Figure 8 Top view schematic of the battery device according to an embodiment of the present application with a first pressure sensor mounted on the box body Figure 2 , where the battery cell is not installed in the box and the box body is provided with a cross beam;

[0027] Figure 9 Assembly structure schematic diagram of the cross beam of the box body of the battery device and the second pressure sensor according to an embodiment of the present application;

[0028] Figure 10 Partial cross-sectional schematic diagram of the battery device according to an embodiment of the present application;

[0029] Figure 11 Schematic diagram of the structure of an electrical equipment according to an embodiment of the present application.

[0030] Among them, the reference numerals in the figure are:

[0031] 100, battery cell; 101, battery cell assembly; 102, large side wall; 103, small side wall; 104, top wall;

[0032] 10, first pressure sensor;

[0033] 20, second pressure sensor;

[0034] 30, third pressure sensor;

[0035] 40, fourth pressure sensor;

[0036] 50, fifth pressure sensor;

[0037] 60, elastic member;

[0038] 200. Battery device; 201. Box main body; 2011. Bottom wall; 2012. Circumferential enclosing wall; 2013. Cross beam; 2014. First side wall; 2015. Second side wall; 2016. Outer side wall; 2017. Inner side wall; 202. Box cover; 203. Assembly space;

[0039] 400. Electrical equipment; 410. Electrical load; 420. Control device; 430. Frame; 440. Wheel. Detailed implementation manners

[0040] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0042] In addition, the terms "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0043] In the present application, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0044] At present, from the perspective of the development of the market situation, the application of battery devices is becoming more and more extensive. Battery devices are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power plants (battery devices for such applications are generally collectively referred to as energy storage batteries), but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as multiple fields such as military equipment and aerospace (battery devices for such applications are generally collectively referred to as power batteries).

[0045] With the continuous development of battery technology, the energy density requirements for battery devices are getting higher and higher, which is intuitively reflected in the more and more compact arrangement and installation of multiple battery cells in the box body. At the same time, the operating state of battery devices is also getting more and more attention from users.

[0046] Among the types of faults in battery devices, thermal runaway of battery cells is one of the key faults to be prevented. At present, the battery devices on the market monitor the operating conditions of the battery devices by sampling data such as voltage and temperature, so as to monitor and judge the operating state of the battery cells in the battery devices. However, by sampling data such as voltage and temperature, it is only possible to estimate and judge the operating conditions of the battery cells, and it is difficult to directly, accurately, and effectively monitor and judge whether there is a hidden danger of thermal runaway in the battery cells.

[0047] Based on the above considerations, the embodiments of the present application provide a battery device. The battery device is additionally provided with a pressure monitoring component to monitor the expansion force generated by the battery cells in real time, so as to monitor the expressed expansion force in real time and accurately, and to directly, accurately, and effectively monitor and judge the charge and discharge operating conditions of the battery cells, so as to take corresponding countermeasures in time to repair and maintain the battery device and prevent the battery device from further occurring serious abnormal faults.

[0048] In order to illustrate the technical solutions provided by the embodiments of the present application, the following will be described in detail with reference to specific drawings and embodiments. As Figure 1 shown, the coordinate axis X is the length direction of the battery cell 100, the coordinate axis Y is the width direction of the battery cell 100, and the coordinate axis Z is the height direction of the battery cell 100 (i.e., the height direction Z of the battery cell assembly 101); as Figure 2 and Figure 6 the arrow S in indicates the extending direction of the battery cell assembly 101.

[0049] According to the first aspect of the embodiments of the present application, the embodiments of the present application provide a battery device 200. As Figure 1 、 Figure 2 、 Figures 4 to 7As shown, the battery device 200 includes a box body 201, a pressure monitoring component, and a plurality of battery cells 100. The box body 201 has a bottom wall 2011 and a circumferential surrounding wall 2012. The bottom wall 2011 and the circumferential surrounding wall 2012 enclose an assembly space 203. The plurality of battery cells 100 are distributed on the bottom wall 2011 and accommodated in the assembly space 203. At least part of the outer walls of two adjacent battery cells 100 abut against each other. In this way, when any one of the battery cells 100 generates an expansion force during the charge and discharge operation of the plurality of battery cells 100, the expansion force will be continuously transmitted through the outer shell of the battery cell 100. The pressure monitoring component is arranged in the assembly space 203. As Figure 2 and Figure 3 shown, the pressure monitoring component includes a first pressure sensor 10. The first pressure sensor 10 is installed on the circumferential inner wall of the circumferential surrounding wall 2012, and the first pressure sensor 10 abuts against at least part of the outer wall of the corresponding battery cell 100 facing the circumferential inner wall. In this way, the expansion force transmitted between the battery cells 100 is finally transmitted and acts on the pressure detection component, so as to realize real-time monitoring of the expansion force of the battery cells 100 in the battery device 200.

[0050] In the battery device 200 provided in the embodiment of the present application, during the charge and discharge operation of the plurality of battery cells 100 that abut against each other, when any one of the battery cells 100 generates an expansion force, since at least part of the outer walls of two adjacent battery cells 100 in the plurality of battery cells 100 abut against each other, the expansion force will be continuously transmitted through the outer shell of the battery cell 100. And since the pressure monitoring component abuts against at least part of the outer wall of at least one battery cell 100, therefore, the expansion force will finally be transmitted and act on the first pressure sensor 10 of the pressure monitoring component, so as to realize real-time monitoring of the expansion force of the battery cells 100 in the battery device 200. That is to say, if an abnormal failure occurs in the battery cell 100 of the battery device 200, such as thermal runaway, it will be intuitively characterized by the outward transmitted expansion force, and then the expansion force characterized will be monitored in real time and accurately by the first pressure sensor 10 of the pressure monitoring component, and the charge and discharge operation conditions of the battery cells 100 of the battery device 200 will be monitored, judged intuitively, accurately and effectively, so as to take corresponding countermeasures in time to repair and maintain the battery device 200, prevent the battery device 200 from further occurring serious abnormal failures, help to improve the operation stability of the battery device 200, and help to extend the service life of the battery device 200.

[0051] In the battery device 200 provided by the embodiments of the present application, when an expansion force is generated inside any one of the battery cells 100 in the battery device 200, the expansion force will be continuously transmitted between multiple battery cells 100 that offset each other. Eventually, the expansion force is transmitted to the first pressure sensor 10 provided on the circumferential wall 2012, so as to monitor the expansion force in real time, and then notify the user through a danger warning method, such as beeping alarm, warning light on alarm, etc., to remind the user that there may be a battery cell 100 with an abnormal fault among the multiple battery cells 100 of the battery device 200 at this time, predict the operating state of the battery device 200 in a timely manner, and remind the user to perform maintenance and repair on the battery device 200 in a timely manner, preventing the battery device 200 from further occurring serious abnormal faults, which helps to improve the operating stability of the battery device 200 and helps to extend the service life of the battery device 200.

[0052] In the battery device 200 of the present application, the entire circumferential inner wall of the circumferential wall 2012 is provided with the first pressure sensor 10, so that the contact area between the first pressure sensor 10 and the corresponding battery cell 100 is the largest, thereby improving the detection sensitivity and detection accuracy of the expansion force. In this way, the expansion force characterized can be accurately monitored, so as to accurately, effectively and timely predict the operating state of the battery device 200, and remind the user to perform maintenance and repair on the battery device 200 in a timely manner, preventing the battery device 200 from further occurring serious abnormal faults, which helps to improve the operating stability of the battery device 200 and helps to extend the service life of the battery device 200.

[0053] In some embodiments of the present application, such as Figures 2 to 4 、 Figure 6 and Figure 8 shown, the box body 201 is a square box body, that is, the assembly space 203 is a square space. During the long-term charge and discharge operation of each battery cell 100 in the battery device 200, even if no abnormal fault occurs, each battery cell 100 will generate an expansion force due to the internal electrochemical reaction. This expansion force is subtle and slow-acting, while the expansion force generated by the battery cell 100 in the case of an abnormal fault is violent and rapid-acting. Regardless of the expansion force generated in any case, when an expansion force is generated by any battery cell 100 in the battery device 200, ultimately the circumferential wall 2012 bears and restricts the expansion force. Therefore, in order to reduce the damage to the circumferential wall 2012 caused by the expansion force, especially to reduce the damage to the circumferential wall 2012 caused by the expansion force generated by the battery cell 100 in the case of an abnormal fault, such as Figure 3 、 Figure 4 、 Figure 6 and Figure 8As shown, the circumferential enclosure 2012 includes two opposite first side walls 2014 and two opposite second side walls 2015, and, as Figure 10 shown, at least one of the first side walls 2014 and / or at least one of the second side walls 2015 includes an outer side wall 2016 and an inner side wall 2017. An elastic member 60 is provided between the outer side wall 2016 and the inner side wall 2017. The elastic member 60 is in abutment with the outer side wall 2016 and the inner side wall 2017 respectively. A first pressure sensor 10 is mounted on the side of the inner side wall 2017 facing the assembly space 203. The expansion force acts on the inner side wall 2017, and then the inner side wall 2017 presses the elastic member 60, causing the elastic member 60 to undergo elastic deformation. In this way, the deformation of the elastic member 60 is used to offset and balance the expansion force, achieving the purpose of reducing the damage to the circumferential enclosure 2012 caused by the expansion force.

[0054] In addition, since the elastic member 60 is provided in the circumferential enclosure 2012, when the side position of the battery device 200 is subjected to an external side impact, the energy of the side impact will be transmitted to the elastic member 60 to cause it to undergo elastic deformation, thereby absorbing the energy of the side impact and reducing the energy transmitted to the battery cell 100, thus reducing the damage to the battery cell 100 caused by the external side impact and protecting the battery device 200.

[0055] In an embodiment of the present application, the elastic member 60 is a compression spring or an elastic filler.

[0056] To improve the overall mechanical strength of the box body 201, as Figure 4 、 Figure 8 and Figure 9 shown, the box body 201 further has at least one cross beam 2013. Both ends of the cross beam 2013 are connected to the circumferential enclosure 2012 and are located in the assembly space 203. In this way, the overall mechanical strength of the box body 201 is improved by the pulling and supporting action of the cross beam 2013 on the circumferential enclosure 2012. The cross beam 2013 divides the assembly space 203 into a plurality of adjacent sub-spaces in the assembly space 203. That is to say, a plurality of battery cells 100 are separated and distributed in these sub-spaces. In an embodiment of the present application, as Figure 4 、 Figure 8 and Figure 9As shown in the figure, the pressure monitoring component includes a second pressure sensor 20. The second pressure sensor 20 is mounted on the side wall of the cross beam 2013 facing the battery cell 100, and the second pressure sensor 20 abuts against at least a part of the outer wall of the corresponding battery cell 100 facing the cross beam 2013. In the embodiment of the present application, when an expansion force is generated inside any one of the battery cells 100 in the battery device 200, the expansion force will not only be transmitted along the abutting battery cell 100 to the first pressure sensor 10 mounted on the circumferential wall 2012, but also be transmitted along the abutting battery cell 100 to the second pressure sensor 20 mounted on the cross beam 2013. In this way, the first pressure sensor 10 and the second pressure sensor 20 jointly assist in real-time monitoring whether the battery cells 100 of the battery device 200 generate an expansion force, and then comprehensively analyze the expansion force data monitored by the first pressure sensor 10 and the second pressure sensor 20, so as to more accurately monitor the represented expansion force, and thus more accurately, effectively and timely predict the operating state of the battery device 200. Moreover, since the cross beam 2013 divides the assembly space 203 into multiple sub-spaces, in this way, by comprehensively analyzing the expansion force data monitored by the first pressure sensor 10 and the second pressure sensor 20, it is possible to quickly determine the sub-space position where the battery cell 100 generating the expansion force is located, thereby reducing the number of battery cells 100 that need to be inspected and troubleshot, and improving the work efficiency of inspection and troubleshooting as well as the work efficiency of maintenance and repair.

[0057] In some larger battery devices 200 of the embodiments of the present application, since the box body 201 is relatively large, a cross beam 2013 must be provided inside the box body 201 to enhance the overall mechanical strength of the box body 201. At this time, the battery device 200 can be equipped with only the second pressure sensor 20 on the cross beam 2013, and only the second pressure sensor 20 is used to monitor the expansion force generated by the battery cells 100 of the battery device 200. In this embodiment, it is possible to quickly determine the sub-space position where the battery cell 100 generating the expansion force is located by monitoring which cross beam 2013 the second pressure sensor 20 detecting the expansion force is on and which side of the cross beam 2013 it is located on, thereby reducing the number of battery cells 100 that need to be inspected and troubleshot, and improving the work efficiency of inspection and troubleshooting as well as the work efficiency of maintenance and repair.

[0058] In some other embodiments of the present application, the battery device 200 can be provided with a block-shaped pressure sensor, and the cross beam 2013 is replaced by the block-shaped pressure sensor, so that the block-shaped pressure sensor and the box body 201 form an integral module. This can not only reduce the number of parts of the battery device 200, thereby reducing the overall weight of the battery device 200, but also enable the block-shaped pressure sensor to play the role of enhancing the overall mechanical strength of the box body 201 that the original cross beam 2013 had.

[0059] In an embodiment of the present application, as Figure 6 shown, a plurality of battery cells 100 are arranged to form a plurality of battery cell assemblies 101, and in a direction perpendicular to the extending direction of the battery cell assemblies 101, the plurality of battery cell assemblies 101 are arranged side by side. In this way, the plurality of battery cells 100 are assembled into a plurality of modular battery cell assemblies 101, thereby facilitating the assembly of the plurality of battery cells 100 into the assembly space 203 and improving the working efficiency of successfully assembling the battery cells 100 into the case. And, as Figure 6 and Figure 7 shown, the pressure monitoring component includes a third pressure sensor 30. In a direction perpendicular to the extending direction of the battery cell assemblies 101, a third pressure sensor 30 is provided between two adjacent battery cell assemblies 101, and at least part of the outer walls of the battery cells 100 of the corresponding two adjacent battery cell assemblies 101 are in contact with opposite sides of the third pressure sensor 30. On the basis of using the first pressure sensor 10 and / or the second pressure sensor 20 to monitor the expansion force in real time (that is, the battery device 200 of this embodiment is equipped with the first pressure sensor 10, the second pressure sensor 20 and the third pressure sensor 30 at the same time), the third pressure sensor 30 is also used to monitor the expansion force of the battery cells 100 in the battery device 200 in real time, so that the represented expansion force can be monitored more accurately, and thus the operating state of the battery device 200 can be predicted more accurately, effectively and timely. And, on the basis of determining the subspace position of the battery cell 100 that generates the expansion force by comprehensively analyzing the expansion force data monitored by the first pressure sensor 10 and the second pressure sensor 20, the third pressure sensor 30 can quickly know which battery cell 100 in which battery cell assembly 101 generates the expansion force, thereby further reducing the number of battery cells 100 that need to be inspected and troubleshot, and further improving the working efficiency of inspection and troubleshooting and the working efficiency of maintenance.

[0060] In some embodiments of the present application, the battery device 200 may adopt an assembly method in which the first pressure sensor 10 and the third pressure sensor 30 are assembled in cooperation. That is: the first pressure sensor 10 is provided on the circumferential wall 2012, and a third pressure sensor 30 is provided between two adjacent battery cell assemblies 101 (the second pressure sensor 20 is cancelled).

[0061] In a larger battery device 200 according to some other embodiments of the present application, the battery device 200 may adopt an assembly method in which the second pressure sensor 20 is assembled in cooperation with the third pressure sensor 30. That is: a cross beam 2013 must be provided on the box body 201 of the battery device 200, the second pressure sensor 20 is assembled on the cross beam 2013, and a third pressure sensor 30 is provided between two adjacent battery cell assemblies 101 (the first pressure sensor 10 is cancelled).

[0062] In a battery device 200 according to some other embodiments of the present application, the battery device 200 may also be provided with only a third pressure sensor 30 between two adjacent battery cell assemblies 101, while cancelling the assembly of the first pressure sensor 10 and the second pressure sensor 20.

[0063] In order to be able to further quickly and accurately determine which battery cell 100 in the battery device 200 generates an expansion force, in some embodiments of the present application, as Figure 6 and Figure 7 shown, the pressure monitoring assembly includes a fourth pressure sensor 40. In each battery cell assembly 101, a fourth pressure sensor 40 is provided between two adjacent battery cells 100, and the fourth pressure sensor 40 abuts against at least a part of the outer walls of the two battery cells 100 that face each other. On the basis of comprehensively analyzing the expansion force data monitored by the first pressure sensor 10 and the second pressure sensor 20 to determine the subspace position where the battery cell 100 generating the expansion force is located, and knowing which battery cell assembly 101 the battery cell 100 generating the expansion force is through the third pressure sensor 30, and then combining the expansion force monitored by the fourth pressure sensor 40, it is possible to quickly lock which two battery cells 100 in which battery cell assembly 101 generate the expansion force, greatly reducing the number of battery cells 100 that need to be inspected and troubleshot, and greatly improving the work efficiency of inspection and troubleshooting as well as the work efficiency of overhaul and maintenance. Moreover, by comprehensively analyzing the expansion force data respectively monitored by the first pressure sensor 10, the second pressure sensor 20, the third pressure sensor 30 and the fourth pressure sensor 40, the operating state of the battery device 200 can be further accurately, effectively and timely predicted.

[0064] In a battery device 200 according to some embodiments of the present application, the battery device 200 may also be provided with only a fourth pressure sensor 40 between two adjacent battery cells 100 of the battery cell assembly 101, while cancelling the assembly of the first pressure sensor 10, the second pressure sensor 20 and the third pressure sensor 30.

[0065] As Figure 1As shown, the battery cell 100 of the present application is a square battery cell, also called a square cell. The square battery cell 100 has two large side walls 102 with a larger surface area, two small side walls 103 with a smaller surface area, a bottom end wall and a top end wall 104. The two large side walls 102 and the two small side walls 103 are alternately connected to form a prismatic side wall, and the bottom end wall and the top end wall 104 are respectively located at the upper and lower ends of the cylindrical side wall. In addition, a plurality of battery cells 100 are distributed on the bottom wall 2011 in a rectangular array, that is, the battery cells 100 between two adjacent battery cell assemblies 101 are one-to-one corresponding. When the battery cell assembly 101 is arranged along the Figure 2 When extending in the S direction as shown, the two adjacent battery cells 100 in the same battery cell assembly 101 have two large side walls 102 facing each other overlapped and abutted against each other, and the two adjacent battery cell assemblies 101 have two small side walls 103 facing each other overlapped and abutted against each other; when the battery cell assembly 101 is along the Figure 6 When extending in the S direction as shown, the two small side walls 103 of two adjacent battery cells 100 in the same battery cell assembly 101 overlap and abut against each other, and the two large side walls 102 of two adjacent battery cell assemblies 101 overlap and abut against each other. In addition, the circumferential wall 2012 is formed by four planar side walls connected end to end.

[0066] In the embodiments of the present application, the battery cell 100 may be a secondary battery. A secondary battery refers to a battery cell 100 that can be recharged to activate the active material after discharge and continue to be used. The battery cell 100 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, or the like, and the embodiments of the present application are not limited thereto.

[0067] In some embodiments of the present application, Figure 2 As shown, the battery device 200 further includes a box cover 202, which covers the box body 201. Figure 6 and Figure 7As shown, the pressure monitoring component includes a fifth pressure sensor 50. The fifth pressure sensor 50 is installed on the bottom wall 2011. At least part of the bottom of each battery cell 100 (i.e., the bottom end wall of the battery cell 100) abuts against the fifth pressure sensor 50, and the top of each battery cell 100 (i.e., the top end wall 104 of the battery cell 100) abuts against the box cover 202. In the battery device 200 of this embodiment, the fifth pressure sensor 50 is used to monitor in real time the expansion force transmitted by the battery cell 100 in the Z direction of its height. At the same time, the expansion force data monitored by the fifth pressure sensor 50 is combined with the expansion force data monitored by the first pressure sensor 10, the second pressure sensor 20, the third pressure sensor 30, and the fourth pressure sensor 40 respectively for comprehensive analysis, so as to more accurately monitor the represented expansion force, and thus more accurately, effectively, and timely predict the operating state of the battery device 200.

[0068] In the battery device 200 of the present application, the battery device 200 is provided with the first pressure sensor 10, the second pressure sensor 20, the third pressure sensor 30, the fourth pressure sensor 40, and the fifth pressure sensor 50 at the same time. And the first pressure sensor 10, the second pressure sensor 20, the third pressure sensor 30, the fourth pressure sensor 40, and the fifth pressure sensor 50 are all pressure film sensors. A pressure film sensor is a sensor used to measure the force generated by an object due to volume expansion under specific conditions. It can be a resistive pressure sensor that measures pressure through the change in resistance of a thin film material when stressed, a capacitive pressure sensor that detects pressure using the change in thin film capacitance, a pressure sensor of ion-electronic sensing technology that senses pressure through the change in the contact area between an ion material layer and the surface of a flexible conductive material, or a pressure sensor in which a deformation of an elastic element is converted into a displacement or force change through a mechanical structure, and then triggers the electrical signal conversion mechanism inside the sensor, etc., which is not uniquely limited here. Since the pressure film sensor is very thin and light, this helps to reduce the overall weight of the battery device 200. And the pressure film sensor can also play the roles of insulation and heat insulation, reduce the mutual influence of heat transfer between adjacent two battery cells 100, effectively organize the spread and expansion of thermal runaway, and reduce the heat transfer between the battery cell 100 and the box body 201.

[0069] According to the second aspect of the embodiments of the present application, the embodiments of the present application also provide an electrical device 400, and the electrical device 400 includes an electrical load 410.

[0070] The electrical equipment 400 includes, but is not limited to, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include, but are not limited to, fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include, but is not limited to, airplanes, rockets, space shuttles, and spaceships, etc.

[0071] The electrical equipment 400 further includes the battery device 200 as described above, that is, the electrical equipment 400 uses one battery device 200 or multiple battery devices 200 for series connection, parallel connection, or hybrid connection, and the electrical load 410 is electrically connected to the battery device 200. The battery device 200 is used to store electrical energy, or the battery device 200 is used to supply electrical energy to the electrical load 410, so that the electrical load 410 can operate normally.

[0072] Among them, the electrical equipment 400 is an electric vehicle and is assembled with the battery device 200. As Figure 11 shown, the battery device 200 is installed on the vehicle frame 430 of the electric vehicle. The electric vehicle includes a vehicle frame 430, a drive motor, and wheels 440. The battery device 200 and the drive motor are both fixedly installed on the vehicle frame 430, the wheels 440 are rotatably connected to the vehicle frame 430, and the battery device 200 is electrically connected to the drive motor, and the drive motor is drivingly connected to the wheels 440. Applying the battery device 200 provided by the present application to supply power to the drive motor (the drive motor is one of the electrical loads 410 of the electrical equipment 400), the drive motor drives the wheels 440 to rotate, so that the electric vehicle can drive normally. And, the electric vehicle includes a control device 420, the control device 420 is installed on the vehicle frame 430, the control device 420 is electrically connected to the battery device 200, and the control device 420 is used to control and monitor the charge and discharge working state of the battery device 200. In some electric vehicles, the battery box of the battery device 200 can be used as a part of the chassis structure of the electric vehicle. For example, a part of the battery box can become at least a part of the floor of the electric vehicle, or a part of the battery box can become at least a part of the cross beam and longitudinal beam of the electric vehicle.

[0073] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that, Comprising: A box body having a bottom wall and a circumferential side wall, the bottom wall and the circumferential side wall enclosing an assembly space; A plurality of battery cells distributed on the bottom wall and received in the assembly space, at least a part of the outer walls of two adjacent battery cells abutting against each other; A pressure monitoring assembly disposed in the assembly space, the pressure monitoring assembly including a first pressure sensor mounted on the circumferential inner wall of the circumferential side wall, the first pressure sensor abutting against at least a part of the outer wall of the corresponding battery cell facing the circumferential inner wall; The circumferential side wall includes two opposite first side walls and two opposite second side walls, at least one of the first side walls and / or at least one of the second side walls includes an outer wall facing away from the battery cell and an inner wall facing the battery cell, an elastic member is provided between the outer wall and the inner wall, the elastic member abuts against the outer wall and the inner wall respectively, and the first pressure sensor is mounted on a side of the inner wall facing the assembly space.

2. The battery device according to claim 1, wherein The elastic member is a compression spring or an elastic filler.

3. The battery device according to claim 1, wherein The pressure monitoring assembly includes a second pressure sensor, the box body further has at least one cross beam, both ends of the cross beam are connected to the circumferential side wall and are located in the assembly space, the second pressure sensor is mounted on a side wall of the cross beam facing the battery cell, and the second pressure sensor abuts against at least a part of the outer wall of the corresponding battery cell facing the cross beam.

4. The battery device according to claim 1, wherein The pressure monitoring assembly includes a third pressure sensor, the plurality of battery cells are arranged to form a plurality of battery cell assemblies, in a direction perpendicular to the extending direction of the battery cell assemblies, the plurality of battery cell assemblies are arranged side by side, and a third pressure sensor is provided between two adjacent battery cell assemblies, opposite sides of the third pressure sensor respectively abut against at least a part of the outer walls of the battery cells of the corresponding two adjacent battery cell assemblies.

5. The battery device according to claim 4, wherein The pressure monitoring assembly includes a fourth pressure sensor, in each battery cell assembly, a fourth pressure sensor is provided between two adjacent battery cells, and the fourth pressure sensor abuts against at least a part of the outer walls of the two battery cells facing each other.

6. The battery device according to claim 1, wherein The battery device further includes a box cover, the pressure monitoring assembly includes a fifth pressure sensor, the box cover covers the box body, the fifth pressure sensor is mounted on the bottom wall, at least a part of the bottom of the battery cell abuts against the fifth pressure sensor, and the top of the battery cell abuts against the box cover.

7. The battery device according to any one of claims 1-6, wherein The pressure monitoring assembly is a pressure film sensor.

8. An electrical device, characterized in that, Comprising: Electrical load; And, An electrical load electrically connected to the battery device according to any one of claims 1-7.

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