Battery device, energy storage device, energy storage system, and charging network

Abstract

The application discloses a battery device, an energy storage device, an energy storage system and a charging network. The battery device comprises: a battery monomer assembly, the battery monomer assembly comprises a plurality of battery monomers arranged along a first direction, and a first wall of each battery monomer is provided with an electrode terminal; a plurality of bus components are used for electrically connecting the electrode terminals of the plurality of battery monomers; a monitoring unit is used for collecting data of the plurality of battery monomers; wherein the monitoring unit is connected to a surface of the bus component facing the first wall. Therefore, the battery device, the energy storage device, the energy storage system and the charging network of the application can improve the reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device, an energy storage device, an energy storage system, and a charging network. Background Technology

[0002] With the continuous advancement of battery technology, various new energy industries that use battery devices as energy storage equipment have developed rapidly. In the development of battery technology, in addition to improving the performance of battery devices, how to improve the processing efficiency of battery devices is also an urgent problem to be solved. Summary of the Invention

[0003] This application provides a battery device, an energy storage device, an energy storage system, and a charging network, which can improve the reliability of the battery device.

[0004] In a first aspect, a battery device is provided, comprising: a battery cell assembly including a plurality of battery cells arranged along a first direction, each battery cell having an electrode terminal disposed on a first wall; a plurality of busbars for electrically connecting the electrode terminals of the plurality of battery cells; and a monitoring unit for acquiring data from the plurality of battery cells; wherein the monitoring unit is connected to a surface of the busbars facing the first wall.

[0005] Therefore, in the battery device of this application embodiment, the monitoring unit is disposed on the surface of the first wall of the busbar component facing the battery cell, so that the welding tool will not directly squeeze the part of the monitoring unit, thereby improving the reliability of the monitoring unit, reducing the size of the busbar component to increase the energy density of the battery device, and reducing the design difficulty of the busbar component, thereby improving the processing and assembly efficiency of the battery device.

[0006] In some embodiments, the monitoring unit includes multiple voltage acquisition data lines, the sampling ends of which are connected to the surface of the busbar component facing the first wall. The voltage acquisition data lines are used to acquire the voltage of the busbar component to monitor the voltage of the battery cells connected to the busbar component, thereby promptly handling any abnormal voltage of the battery cells and improving the reliability of the battery device.

[0007] In some embodiments, the busbar includes a first electrode terminal connection area, a second electrode terminal connection area, a transition area, and a voltage acquisition area. The transition area connects the first electrode terminal connection area and the second electrode terminal connection area. The voltage acquisition area is located on the side of the transition area away from the second electrode terminal connection area. The first electrode terminal connection area and the second electrode terminal connection area are respectively used to connect the electrode terminals of two battery cells. The sampling end of the voltage acquisition data line is connected to the surface of the voltage acquisition area facing the first wall. The structure is simple, easy to implement, and space-saving. Furthermore, when the welding tool welds the first electrode terminal connection area and the electrode terminals, the welding tool does not directly squeeze the sampling end of the voltage acquisition data line, which can save the size of the busbar and improve the reliability of the sampling end of the voltage acquisition data line.

[0008] In some embodiments, the monitoring unit further includes at least one temperature acquisition data line, the sampling end of which is connected to the surface of the busbar component facing the first wall. The temperature acquisition data line is used to acquire the temperature of the busbar component to monitor the temperature of the battery cells connected to the busbar component, so as to measure the temperature of the busbar component through the sampling end of the temperature acquisition data line, thereby determining the temperature of the battery cells connected to the busbar component, and monitoring whether the temperature of the battery cells is abnormal, so as to handle the abnormal temperature of the battery cells in a timely manner.

[0009] In some embodiments, the sampling end of the temperature acquisition data line is connected to the surface of the transition region facing the first wall. Considering the limited size of the first electrode terminal connection area and the second electrode terminal connection area, placing the temperature acquisition data line in the transition region saves space. Furthermore, connecting the sampling end of the temperature acquisition data line to the surface of the transition region facing the first wall reduces the risk of the welding tool directly crushing the sampling end of the temperature acquisition data line when welding the first electrode terminal connection area and the electrode terminal, and when welding the second electrode terminal connection area and the electrode terminal, thereby improving the reliability of the sampling end of the temperature acquisition data line.

[0010] In some embodiments, the transition region bulges away from the battery cell relative to the first electrode terminal connection area and the second electrode terminal connection area. Considering that during battery device use, due to transportation or charging / discharging of battery cells, the battery cells may deform or misalign, the busbar component may be subjected to stretching or compression. By providing a raised transition region, some of the deformation can be absorbed, improving the stability and deformation resistance of the busbar component. Furthermore, since the sampling end of the temperature acquisition data line has a certain thickness, it is positioned on the side of the transition region facing the first wall of the battery cell. In the case of a raised transition region, this raised area can also provide a accommodating space for the sampling end of the temperature acquisition data line.

[0011] In some embodiments, the battery device further includes a fixing film, with a plurality of the busbar components and the monitoring unit located on the side of the fixing film away from the battery cell, thereby fixing the positions of the plurality of busbar components and the monitoring unit.

[0012] In some embodiments, the fixing membrane includes a first hole, a second hole, and a third hole. The first hole corresponds to the first electrode terminal connection area, the second hole corresponds to the second electrode terminal connection area, and the third hole corresponds to the voltage acquisition area. At least a portion of the sampling end of the voltage acquisition data line is accommodated in the third hole. By providing the first and second holes, the welding between the bus component and the electrode terminals is facilitated; by providing the third hole, the space occupied by the sampling end of the voltage acquisition data line can be reduced, improving the stability between the bus component and the fixing membrane.

[0013] In some embodiments, the first hole and the third hole are the same hole to reduce the number of holes provided on the fixing film, thereby facilitating processing.

[0014] In some embodiments, the monitoring unit further includes at least one temperature acquisition data line, the sampling end of which is connected to the surface of the busbar component facing the first wall. The temperature acquisition data line is used to acquire the temperature of the busbar component to monitor the temperature of the battery cells connected to the busbar component. The fixing film also includes a fourth hole, in which at least a portion of the sampling end of the temperature acquisition data line is accommodated. Since the sampling end of the temperature acquisition data line is relatively thick, the fourth hole can accommodate at least a portion of the sampling end, thereby saving space along the thickness direction of the fixing film.

[0015] In some embodiments, the first wall is provided with a pressure relief mechanism, and the fixing membrane further includes a fifth hole corresponding to the pressure relief mechanism to reduce the obstruction of the fixing membrane to the emissions discharged by the pressure relief mechanism and improve the reliability of the battery device.

[0016] The fifth hole corresponds to the pressure relief mechanism of multiple battery cells, reducing the number of fifth holes provided on the fixing film to facilitate processing.

[0017] The fixing membrane is provided with a plurality of fifth holes arranged along the first direction, and each of the plurality of fifth holes corresponds one-to-one with the pressure relief mechanism of a plurality of battery cells. The total area occupied by all the fifth holes on the fixing membrane is smaller, which can improve the structural strength and stability of the fixing membrane and reduce the risk of local damage to the fixing membrane.

[0018] In some embodiments, multiple busbar components and the monitoring unit are fixed to the fixing membrane by hot pressing, which is an easy-to-implement and structurally stable method.

[0019] In some embodiments, the length of the sampling end of the voltage acquisition data line connected to the busbar is within the range of [8mm, 16mm]. Setting this length to be greater than or equal to 8mm can improve the connection stability between the sampling end of the voltage acquisition data line and the voltage acquisition area of ​​the busbar, so as to facilitate accurate measurement of the voltage of the busbar; setting this length to be less than or equal to 16mm can limit the size of the area of ​​the busbar occupied by the sampling end of the voltage acquisition data line, thereby reducing the size of the busbar and improving the space utilization and energy density of the battery device.

[0020] In a second aspect, an energy storage device is provided, comprising: a plurality of battery devices as described in the first aspect or any one of the embodiments of the first aspect, the battery device being used to store or provide electrical energy.

[0021] Thirdly, an energy storage system is provided, comprising: a power conversion device; and the energy storage device described in the second aspect, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0022] Fourthly, a charging network is provided, comprising: a charging pile; an energy storage device as described in the second aspect or an energy storage system as described in the third aspect, the energy storage device being used to provide electrical energy to the charging pile. Attached Figure Description

[0023] Figure 1 This is an exploded view of a battery device according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of a partial structure of a battery device according to an embodiment of this application;

[0025] Figure 3 This is a top view schematic diagram of a partial structure of a battery device according to an embodiment of this application;

[0026] Figure 4 This is a top view schematic diagram of another partial structure of a battery device according to an embodiment of this application;

[0027] Figure 5 This is a bottom view of a partial structure of a battery device according to an embodiment of this application;

[0028] Figure 6 This is a bottom view schematic diagram of another partial structure of a battery device according to an embodiment of this application;

[0029] Figure 7 This is a cross-sectional schematic diagram of a partial structure of a battery device according to an embodiment of this application;

[0030] Figure 8 This is a cross-sectional schematic diagram of another partial structure of a battery device according to an embodiment of this application;

[0031] Figure 9 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0032] Figure 10 This is a structural block diagram of an energy storage system according to an embodiment of this application;

[0033] Figure 11 This is a structural block diagram of a charging network according to an embodiment of this application.

[0034] The accompanying drawings are not drawn to scale. Detailed Implementation

[0035] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0038] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0041] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0042] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0043] In the development of battery technology, to improve the energy density of battery devices, a large number of individual battery cells are typically incorporated. To monitor and manage the state of these cells, sampling harnesses are usually installed within the battery device to collect state information such as voltage and / or temperature from each cell. For example, the sampling harness can collect state information from a busbar to determine the state of the battery cell connected to that busbar. How to rationally position the sampling harnesses and busbars to improve the processing efficiency of battery devices is a pressing issue that needs to be addressed.

[0044] This application provides a battery device, energy storage device, energy storage system, and charging network that can solve the aforementioned problems. The battery device of this application includes a battery cell assembly, multiple busbars, and a monitoring unit. The battery cell assembly includes multiple battery cells arranged along a first direction, each battery cell having an electrode terminal on its first wall. The multiple busbars are used to electrically connect the electrode terminals of the multiple battery cells to achieve electrical connection between the multiple battery cells. The monitoring unit is used to collect data from the multiple battery cells, and the monitoring unit is connected to the surface of the busbar facing the battery cells. When welding the busbar to the electrode terminals of the battery cells, a welding tool is placed on the surface of the busbar away from the first wall to position and fix the busbar to the electrode terminals. If the monitoring unit is also connected to the surface of the busbar away from the first wall, the portion of the busbar to which the monitoring unit is connected needs to avoid the welding area of ​​the busbar and the area around the welding area used to house the welding tool, in order to reduce the risk of damaging the monitoring unit during welding. Simultaneously, for accurate detection, the size of the connection area between the monitoring unit and the busbar should not be too small; therefore, this design requires increasing the size of the busbar. This application places the monitoring unit on the surface of the first wall of the busbar component facing the battery cell, so that the welding tool will not directly squeeze the part of the monitoring unit, which improves the reliability of the monitoring unit, reduces the size of the busbar component to increase the energy density of the battery device, and also reduces the design difficulty of the busbar component, thereby improving the processing and assembly efficiency of the battery device.

[0045] Figure 1 An exploded view of the battery device 10 according to an embodiment of this application is shown. Figure 1 As shown, the battery device 10 of this embodiment includes a housing 11, which can be used to accommodate at least one battery cell 20. The housing 11 of this embodiment has a hollow internal structure, and at least one battery cell 20 is accommodated within the housing 11. Specifically, the housing 11 includes a first housing portion 111 and a second housing portion 112, which are sealed together. For example, the first housing portion 111 and the second housing portion 112 can be snapped together to form a hollow structure. The shape of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components accommodated internally, for example, it can be determined according to the shape of a combination of multiple battery cells 20 accommodated internally.

[0046] In the embodiments of this application, at least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as Figure 1As shown, the first box portion 111 and the second box portion 112 can both be hollow cuboids with one face as an opening. The openings of the first box portion 111 and the second box portion 112 are arranged opposite to each other, and the first box portion 111 and the second box portion 112 are interlocked to form a box 11 with a closed chamber, which can be used to accommodate at least one battery cell 20.

[0047] For example, unlike Figure 1 As shown, only one of the first housing portion 111 and the second housing portion 112 may be a hollow cuboid with an opening, while the other may be plate-shaped to cover the opening. Taking the first housing portion 111 as a hollow cuboid with one opening and the second housing portion 112 as a plate-shaped example, the second housing portion 112 is used to cover the opening of the first housing portion 111 to form a housing 11 with a closed chamber, which can be used to accommodate at least one battery cell 20.

[0048] like Figure 1 As shown, for ease of explanation, this application embodiment defines three directions: the length direction X of the battery device 10, the width direction Y of the battery device 10, and the height direction Z of the battery device 10. The length direction X, the width direction Y, and the height direction Z are perpendicular to each other, and the size of the battery device 10 in the length direction X is greater than the size in the width direction Y.

[0049] Figure 2 A partial structural schematic diagram of the battery device 10 according to an embodiment of this application is shown, for example, Figure 2 It can be Figure 1 A partial structural schematic diagram of the battery device 10 shown; Figure 3 A top view schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown; Figure 4 A top view schematic diagram of another partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 4 for Figure 3 Enlarged schematic diagram of region A in the middle; Figure 5 A bottom view schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 5 for Figure 3 The diagram shown is a schematic representation of the structure from another angle. Figure 3 A schematic diagram of the back side of the structure shown; Figure 6 A bottom view schematic diagram of another partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 6 for Figure 5 A magnified view of region B in the middle.

[0050] like Figures 2 to 6As shown, the battery device 10 of this application embodiment includes a battery cell assembly 200, a busbar component 121, and a monitoring unit 122. Specifically, the battery cell assembly 200 includes a plurality of battery cells 20 arranged along a first direction, and each battery cell 20 has an electrode terminal 202 disposed on its first wall 201; the plurality of busbar components 121 are used to electrically connect the electrode terminals 202 of the plurality of battery cells 20; the monitoring unit 122 is used to collect data from the plurality of battery cells 20; wherein, the monitoring unit 122 is connected to the surface of the busbar component 121 facing the first wall 201.

[0051] The battery device 10 mentioned in the embodiments of this application may include one or more battery cell assemblies 200 for providing voltage and capacity. For example, the battery device 10 may include a plurality of battery cell assemblies 200 arranged along its width direction Y. Each battery cell assembly 200 in the embodiments of this application may include a plurality of battery cells 20 arranged along a first direction, wherein the plurality of battery cells 20 may be connected in series, parallel, or mixed. For example, the first direction may be the length direction of the battery device 10, then the battery device 10 may include a plurality of battery cells 20 arranged along its length direction X.

[0052] In some embodiments, the battery cell assembly 200 of this application can be a battery module, which is formed by arranging and fixing multiple battery cells 20 to form an independent module. As an example, the battery module can be formed by binding multiple battery cells 20 together with one or more cable ties 14.

[0053] In some embodiments, the battery device 10 may further include a first end plate 151 and a second end plate 152, which are disposed at both ends of a plurality of battery cells 20 of the battery cell assembly 200 along a first direction to clamp the plurality of battery cells 20, thereby further improving the structural stability of the battery cell assembly 200.

[0054] In some embodiments, the battery device 10 may further include a fixing member 13, which extends along a first direction and has its two ends connected to a first end plate 151 and a second end plate 152, respectively. The fixing member 13 is used to further fix the plurality of battery cells 20 of the battery cell assembly 200, reduce the displacement between the plurality of battery cells 20, and improve the structural stability of the battery cell assembly 200.

[0055] In some embodiments, the battery device 10 may be a battery pack, which includes a housing 11 and one or more battery cell assemblies 200, the battery cell assemblies 200 being housed within the housing 11. As an example, the battery cell assembly 200 may be a battery module, which can be housed within the housing 11 by fixing the battery module to the housing 11. As an example, the battery cell assembly 200 may also be housed within the housing 11 by directly fixing multiple battery cells 20 to the housing 11.

[0056] The battery cell 20 in this application embodiment can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 20 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application has no particular limitations.

[0057] It should be understood that the battery cell 20 in this embodiment of the application is provided with electrode terminals 202. The electrode terminals 202 in this embodiment of the application are used to electrically connect with the electrode assembly inside the battery cell 20 to output the electrical energy of the battery cell 20. The electrode terminals 202 can be directly connected to the tabs or indirectly connected to the tabs through current collectors. The electrode terminals 202 can be disposed on any wall of the battery cell 20.

[0058] The electrode terminals 202 in this embodiment can be located on any one or more walls of the battery cell 20. For example, this embodiment mainly takes a battery cell 20 that includes two electrode terminals 202, and the electrode terminals 202 are located on the same wall of the battery cell 20. Here, it is taken that both electrode terminals 202 are located on the first wall 201, wherein the first wall 201 can be any one of the walls of the battery cell 20, but this embodiment is not limited to this.

[0059] It should be understood that the battery device 10 implemented in this application also includes a plurality of busbars 121. Each of the plurality of busbars 121 is used to electrically connect the electrode terminals 202 of at least two battery cells 20, thereby realizing the electrical connection between the at least two battery cells 20. Therefore, by providing a plurality of busbars 121, the electrical connection between the plurality of battery cells 20 included in the battery cell assembly 200 can be realized. For example, the plurality of busbars 121 can be used to realize the series connection, parallel connection, or series-parallel hybrid connection between the plurality of battery cells 20, and the embodiments of this application are not limited thereto.

[0060] The battery device 10 in this embodiment further includes a monitoring unit 122, which is used to collect data from multiple battery cells 20. For example, the data may include the voltage and / or temperature of multiple battery cells 20, so as to detect abnormalities in the battery cells 20 in a timely manner and then handle them in a timely manner to improve the reliability of the battery device 10.

[0061] In some embodiments, the monitoring unit 122 is connected to the surface of the busbar 121 facing the first wall 201, so that the monitoring unit 122 can collect data from the connected busbar 121. For example, the data may include the voltage and / or temperature of the busbar 121. Based on the data of the busbar 121, the data of the battery cell 20 connected to the busbar 121 can be determined so as to monitor the battery cell 20.

[0062] Furthermore, when welding the busbar component 121 to the electrode terminal 202 of the battery cell 20, a welding tool is positioned on the surface of the busbar component 121 away from the first wall 201 for positioning and fixing the busbar component 121 to the electrode terminal 202. If the monitoring unit 122 is also connected to the surface of the busbar component 121 away from the first wall 201, the portion of the monitoring unit 122 connected to the busbar component 121 needs to avoid the welding area of ​​the busbar component 121 and the area around the welding area used to set the welding tool, in order to reduce the risk of damaging the monitoring unit 122 during the welding process. At the same time, in order to accurately measure the data of the busbar component 121, the size of the portion of the monitoring unit 122 connected to the busbar component 121 should not be too small. Therefore, this design requires increasing the size of the busbar component 121.

[0063] In this application, the monitoring unit 122 is connected to the surface of the first wall 201 of the busbar component 121 facing the battery cell 20, so that the welding tool will not directly squeeze the part of the monitoring unit 122 connected to the busbar component 121, which improves the reliability of the monitoring unit 122, reduces the size of the busbar component 121 to increase the energy density of the battery device 10, and reduces the design difficulty of the busbar component 121, thereby improving the processing and assembly efficiency of the battery device 10.

[0064] The monitoring unit 122 of this application embodiment will now be described in detail with reference to the accompanying drawings.

[0065] In some embodiments, the monitoring unit 122 can be used to monitor the voltage of the battery cells 20. For example, the monitoring unit 122 can be connected to at least one busbar 121 to measure the voltage of each of the at least one busbar 121, thereby determining the voltage of a plurality of battery cells 20 electrically connected to the at least one busbar 121, and thus monitoring the voltage of the plurality of battery cells 20.

[0066] For example, the monitoring unit 122 includes multiple voltage acquisition data lines 1221. The sampling end 12211 of the voltage acquisition data lines 1221 is connected to the surface of the busbar 121 facing the first wall 201. The voltage acquisition data lines 1221 are used to acquire the voltage of the busbar 121 to monitor the voltage of the battery cell 20 connected to the busbar 121. Figures 2 to 6 As shown, the monitoring unit 122 may include multiple voltage acquisition data lines 1221, each voltage acquisition data line 1221 being connected to a busbar 121. One end of the voltage acquisition data line 1221 is a sampling end 12211, which is connected to the surface of the busbar 121 facing the first wall 201. This allows for the measurement of the voltage of the busbar 121 through the sampling end 12211 of the voltage acquisition data line 1221, thereby determining the voltage of the battery cell 20 connected to the busbar 121 and monitoring whether the voltage of the battery cell 20 is abnormal, so as to handle the abnormal voltage of the battery cell 20 in a timely manner.

[0067] It should be understood that the number of voltage acquisition data lines 1221 included in the monitoring unit 122 of this application embodiment can be set according to actual application. For example, the number of voltage acquisition data lines 1221 included in the monitoring unit 122 can be equal to the number of busbars 121 provided in the corresponding battery cell assembly 200, so that each busbar 121 is connected to the sampling end 12211 of the voltage acquisition data line 1221 to acquire the voltage of each busbar 121, but the embodiments of this application are not limited to this.

[0068] It should be understood that the sampling end 12211 of the voltage acquisition data line 1221 in this embodiment is connected to the surface of the bus component 121 facing the first wall 201, and the specific position of the sampling end 12211 of the voltage acquisition data line 1221 can be set according to the actual application.

[0069] In some embodiments, the busbar component 121 includes a first electrode terminal connection area 1211, a second electrode terminal connection area 1212, and a transition area 1213. The first electrode terminal connection area 1211 and the second electrode terminal connection area 1212 are respectively used to connect the electrode terminals 202 of two battery cells 20. The transition area 1213 is used to connect the first electrode terminal connection area 1211 and the second electrode terminal connection area 1212. The structure is simple and easy to implement.

[0070] It should be understood that the sampling end 12211 of the voltage acquisition data line 1221 in this embodiment can be connected to any region of the bus component 121, for example, it can be connected to the first electrode terminal connection area 1211 or the second electrode terminal connection area 1212 of the bus component 121 to facilitate voltage acquisition. For example, this embodiment takes the example of connecting the sampling end 12211 of the voltage acquisition data line 1221 to the first electrode terminal connection area 1211 of the bus component 121.

[0071] Figure 7 A cross-sectional schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown. For example, the... Figure 7 This diagram shows a cross-sectional view of at least a partial structure of the battery cell 20, the busbar 121, the monitoring unit 122, and the fixing member 13 of the battery device 10 according to an embodiment of this application. The cross-section is perpendicular to a first direction and passes through the area of ​​the first electrode terminal connection region 1211 of the busbar 121, where the sampling end 12211 of the voltage acquisition data line 1221 is connected. Figure 7 Taking the first direction as the length direction X of the battery device 10 as an example.

[0072] In some embodiments, the bus component 121 further includes a voltage acquisition area 1214, which is located on the side of the transition area 1213 away from the second electrode terminal connection area 1212, and the sampling end 12211 of the voltage acquisition data line 1221 is connected to the surface of the voltage acquisition area 1214 facing the first wall 201. Figures 3 to 7 As shown, the voltage acquisition area 1214 is disposed in the first electrode terminal connection area 1211. For example, it can be disposed at the edge of the first electrode terminal connection area 1211, such as the edge region away from the transition area 1213, in order to save space. The sampling end 12211 of the voltage acquisition data line 1221 is connected to the surface of the voltage acquisition area 1214 of the bus component 121 facing the first wall 201, so that when the welding tool welds the first electrode terminal connection area 1211 and the electrode terminal 202, the welding tool will not directly squeeze the sampling end 12211 of the voltage acquisition data line 1221. This can save the size of the bus component 121 and improve the reliability of the sampling end 12211 of the voltage acquisition data line 1221.

[0073] It should be understood that the length L of the sampling end 12211 of the voltage acquisition data line 1221 connected to the bus component 121 in this embodiment of the application can be set according to the actual application.

[0074] For example, the length L of the sampling end 12211 of the voltage acquisition data line 1221 connected to the busbar 121 ranges from [8mm, 16mm]. Figures 3 to 7 As shown, setting the length L to be greater than or equal to 8 mm can improve the connection stability between the sampling end 12211 of the voltage acquisition data line 1221 and the voltage acquisition area 1214 of the busbar 121, so as to accurately measure the voltage of the busbar 121; setting the length L to be less than or equal to 16 mm can limit the size of the area of ​​the busbar 121 occupied by the sampling end 12211 of the voltage acquisition data line 1221, thereby reducing the size of the busbar 121 and improving the space utilization and energy density of the battery device 10.

[0075] It should be understood that the length L of the sampling end 12211 of the voltage acquisition data line 1221 connected to the bus component 121 in this embodiment of the application can refer to the length of the portion of the voltage acquisition data line 12211 that is in contact with the voltage acquisition area 1214 of the bus component 121.

[0076] Furthermore, the length L of the sampling end 12211 of the voltage acquisition data line 1221 connected to the bus component 121 can also be in the range of [9mm, 11mm], so as to improve the space utilization and energy density of the battery device 10 while improving structural stability and measurement accuracy.

[0077] In some embodiments, the length L of the sampling end 12211 of the voltage acquisition data line 1221 connected to the bus component 121 can be any of the following values ​​or between any two of the following values: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or 16mm.

[0078] In some embodiments, the monitoring unit 122 can be used to monitor the temperature of the battery cells 20. For example, the monitoring unit 122 can be connected to at least one busbar 121 to measure the temperature of each of the at least one busbar 121, thereby determining the temperature of a plurality of battery cells 20 electrically connected to the at least one busbar 121, thereby monitoring the temperature of the plurality of battery cells 20, and promptly handling any abnormal temperatures.

[0079] In some embodiments, the monitoring unit 122 includes at least one temperature acquisition data line 1222. The sampling end 12221 of the temperature acquisition data line 1222 is connected to the surface of the busbar 121 facing the first wall 201. The temperature acquisition data line 1222 is used to acquire the temperature of the busbar 121 to monitor the temperature of the battery cell 20 connected to the busbar 121. Figures 3 to 7 As shown, the monitoring unit 122 may include at least one temperature acquisition data line 1222, each temperature acquisition data line 1222 being connected to a corresponding busbar component 121. One end of the temperature acquisition data line 1222 is a sampling end 12221, which is connected to the surface of the busbar component 121 facing the first wall 201, so as to measure the temperature of the busbar component 121 through the sampling end 12221 of the temperature acquisition data line 1222, thereby determining the temperature of the battery cell 20 connected to the busbar component 121, monitoring whether the temperature of the battery cell 20 is abnormal, so as to handle the abnormal temperature of the battery cell 20 in a timely manner.

[0080] It should be understood that the number of temperature acquisition data lines 1222 included in the monitoring unit 122 of this application embodiment can be set according to actual application. For example, the number of temperature acquisition data lines 1222 included in the monitoring unit 122 can be less than or equal to the number of busbars 121 provided in the corresponding battery cell assembly 200, so that at least some of the busbars 121 are connected to the sampling ends 12221 of the temperature acquisition data lines 1222, thereby reducing the number of temperature acquisition data lines 1222 and simplifying the structure. However, the embodiments of this application are not limited to this.

[0081] It should be understood that the sampling end 12221 of the temperature acquisition data line 1222 in this embodiment is connected to the surface of the busbar 121 facing the first wall 201, and the specific position of the sampling end 12221 of the temperature acquisition data line 1222 can be set according to the actual application.

[0082] Figure 8 A cross-sectional schematic diagram of another partial structure of the battery device 10 according to an embodiment of this application is shown, for example, the Figure 8 This diagram shows a cross-sectional view of at least a partial structure of the battery cell 20, the busbar 121, the monitoring unit 122, and the fixing member 13 of the battery device 10 according to an embodiment of this application. The cross-section is perpendicular to a first direction and passes through the area of ​​the transition region 1213 of the busbar 121 where the sampling end 12221 of the temperature acquisition data line 1222 is connected. Figure 8 Taking the first direction as the length direction X of the battery device 10 as an example.

[0083] In some embodiments, the sampling end 12221 of the temperature acquisition data line 1222 is connected to the surface of the transition region 1213 facing the first wall 201. For example... Figures 3 to 8 As shown, considering the limited size of the first electrode terminal connection area 1211 and the second electrode terminal connection area 1212, the temperature acquisition data line 1222 is placed in the transition area 1213 to save space. Furthermore, the sampling end 12221 of the temperature acquisition data line 1222 is connected to the surface of the transition area 1213 facing the first wall 201. This reduces the risk of the welding tool directly pressing the sampling end 12221 of the temperature acquisition data line 1222 when welding the first electrode terminal connection area 1211 and the electrode terminal 202, and when welding the second electrode terminal connection area 1212 and the electrode terminal 202, thereby improving the reliability of the sampling end 12221 of the temperature acquisition data line 1222.

[0084] In some embodiments, the transition region 1213 protrudes relative to the first electrode terminal connection region 1211 and the second electrode terminal connection region 1212 in a direction away from the battery cell 20. For example... Figures 3 to 8 As shown, considering that during the use of the battery device 10, due to transportation or charging and discharging of the battery cells 20, the battery cells 20 may deform or misalign with each other, the busbar component 121 may be subjected to stretching or compression. By setting a raised transition region 1213, some of the deformation can be absorbed, improving the stability and deformation resistance of the busbar component 121. In addition, since the sampling end 12221 of the temperature acquisition data line 1222 has a certain thickness, it is set on the side of the transition region 1213 facing the first wall 201 of the battery cell 20. When the transition region 1213 is raised, the raised area can also be used to provide a space for the sampling end 12221 of the temperature acquisition data line 1222.

[0085] It should be understood that the sampling end 12221 of the temperature acquisition data line 1222 in this application embodiment may include a negative temperature coefficient thermistor (NTC) for acquiring the temperature of the bus component 121, but this application embodiment is not limited to this. For example, the sampling end 12221 of the temperature acquisition data line 1222 can be formed by dispensing adhesive to encapsulate the NTC. The dispensing adhesive can reduce the influence of the external environment on the NTC, such as moisture, dust, vibration, etc., so that the NTC can measure the temperature stably and accurately, and also play a role in fixing the NTC, reducing its displacement or damage during the operation of the battery device 10.

[0086] It should be understood that the size of the sampling end 12221 of the temperature acquisition data line 1222 in this application embodiment can be set according to the actual application.

[0087] In some embodiments, the thickness H of the sampling end 12221 of the temperature acquisition data line 1222 can be set to a range of [6mm, 10mm] along the thickness direction of the first wall 201. For example, as... Figures 3 to 8 As shown, taking the thickness direction of the first wall 201 as the height direction Z of the battery device 10 as an example, the thickness H of the sampling end 12221 of the temperature acquisition data line 1222 is usually greater than or equal to 6mm to improve the stability and measurement accuracy of the sampling end 12221 of the temperature acquisition data line 1222. Setting the thickness H of the sampling end 12221 of the temperature acquisition data line 1222 to be less than or equal to 10mm can limit the size of the sampling end 12221 of the temperature acquisition data line 1222, thereby reducing the space it occupies and improving space utilization.

[0088] In some embodiments, one end of the voltage acquisition data line 1221 is a sampling end 12211, and the other end can be a connection end; similarly, one end of the temperature acquisition data line 1222 is a sampling end 12221, and the other end can be a connection end. Both the connection ends of the voltage acquisition data line 1221 and the connection ends of the temperature acquisition data line 1222 can be connected to the holes of the first connector 124. The first connector 124 may include multiple holes to connect multiple connection ends of the voltage acquisition data lines 1221 and at least one connection end of the temperature acquisition data line 1222.

[0089] Furthermore, the battery device 10 may also include a battery management unit, which includes a second connector. By connecting the first connector 124 to the second connector, the battery management unit can receive the voltage of the busbar 121 measured by the sampling end 12211 of the voltage acquisition data line 1221, and receive the temperature of the busbar 121 measured by the sampling end 12221 of the temperature acquisition data line 1222. Based on the voltage and temperature of the busbar 121, the battery cell 20 connected to the busbar 121 is determined accordingly, thereby realizing the monitoring of the battery cell 20.

[0090] It should be understood that the battery management unit in this application embodiment can be a component within the battery device 10. For example, the battery management unit can be the battery management system (BMS) of the battery device 10 for ease of implementation.

[0091] It should be understood that the multiple busbar components 121 and the monitoring unit 122 in this application embodiment can be fixed separately to increase flexibility; or, the multiple busbar components 121 and the monitoring unit 122 can be assembled, for example, they can be assembled into a connecting component 12 so as to be fixed together with the battery cell assembly 200 to improve installation efficiency.

[0092] In some embodiments, the battery device further includes a fixing film 123, with a plurality of busbar components 121 and a monitoring unit 122 located on the side of the fixing film 123 away from the battery cell 20. This fixing film 123 facilitates fixing the positions of the plurality of busbar components 121 and the monitoring unit 122. Furthermore, the fixing film 123 can also serve an insulating function, isolating the first wall 201 of the battery cell 20 from other components. For example, it can be used to isolate the electrode terminals 202 of the first wall 201 from other metal components, thereby reducing the risk of short circuits and improving insulation performance.

[0093] In some embodiments, the fixing membrane 123 of this application embodiment can be fixed to the busbar component 121 and the monitoring unit 122 in various ways. For example, multiple busbar components 121 and monitoring units 122 can be fixed to the fixing membrane 123 by hot pressing, that is, the fixing membrane 123 can be a hot-pressed membrane, the fixing method is easy to implement and the structure is stable.

[0094] For example, multiple busbar components 121 and monitoring units 122 are fixed by a thermoforming film to form a connection assembly 12, which can be a thermoforming battery cell connection system (CCS).

[0095] In some embodiments, when multiple busbar components 121 and monitoring units 122 are fixed by a fixing membrane 123 to form a connecting assembly 12, the fixing member 13 of the battery device 10 can be disposed on the side of the connecting assembly 12 away from the battery cell 20, but the embodiments of this application are not limited to this. Compared to disposing the fixing member 13 between the connecting assembly 12 and the battery cell assembly 200, there is no need for the connecting assembly 12 to have an area to avoid the fixing member 13, reducing the processing and installation difficulty of the connecting assembly 12. Furthermore, in the event that the fixing member 13 deforms due to the expansion of multiple battery cells 20 within the battery cell assembly 200, the impact of the fixing member 13 on the connecting assembly 12 is smaller, reducing the possibility of the connecting assembly 12 being damaged by the deformation and compression of the fixing member 13, thereby improving the structural stability of the connecting assembly 12.

[0096] In some embodiments, the fixing film 123 includes a first hole 1231 and a second hole 1232, the first hole 1231 corresponding to the first electrode terminal connection area 1211, and the second hole 1232 corresponding to the second electrode terminal connection area 1212. For example... Figures 3 to 8 As shown, by providing the first hole 1231, the surface of the first electrode terminal connection area 1211 facing the electrode terminal 202 can be exposed, so as to realize the electrical connection between the first electrode terminal connection area 1211 and the corresponding electrode terminal 202; similarly, by providing the second hole 1232, the surface of the second electrode terminal connection area 1212 facing the electrode terminal 202 can be exposed, so as to realize the electrical connection between the second electrode terminal connection area 1212 and the corresponding electrode terminal 202.

[0097] In some embodiments, the range of the first hole 1231 is generally larger than the area in the first electrode terminal connection area 1211 used for welding, so as to facilitate welding; in addition, the range of the first hole 1231 is generally smaller than the range of the first electrode terminal connection area 1211, so that the portion of the fixing film 123 located at the edge of the first hole 1231 can be fixed to the area in the first electrode terminal connection area 1211 that is not used for actual welding, so as to achieve the fixation between the busbar component 121 and the fixing film 123.

[0098] Similarly, the range of the second hole 1232 is generally larger than the area used for welding in the second electrode terminal connection area 1212 to facilitate welding; in addition, the range of the second hole 1232 is generally smaller than the range of the second electrode terminal connection area 1212, so that the portion of the fixing film 123 located at the edge of the second hole 1232 can be fixed to the area in the second electrode terminal connection area 1212 that is not used for actual welding, so as to achieve the fixation between the busbar component 121 and the fixing film 123.

[0099] In some embodiments, when the busbar 121 is provided with a voltage acquisition area 1214, the fixed membrane 123 further includes a third hole 1233, which corresponds to the voltage acquisition area 1214. At least a portion of the sampling end 12211 of the voltage acquisition data line 1221 is accommodated in the third hole 1233, so as to reduce the space occupied by the sampling end 12211 of the voltage acquisition data line 1221 and improve the stability between the busbar 121 and the fixed membrane 123.

[0100] Furthermore, the range of the third hole 1233 is usually larger than the range of the voltage acquisition area 1214 of the bus component 121, so that the third hole 1233 can accommodate more area of ​​the voltage acquisition data line 1221, thereby reducing the space occupied by this part of the area and improving space utilization.

[0101] In some embodiments, considering that the voltage acquisition area 1214 and the first electrode terminal connection area 1211 are located on the same side of the transition area 1213, the first hole 1231 and the third hole 1233 can be set as the same hole to reduce the number of holes provided on the fixing film 123 for easier processing.

[0102] In some embodiments, when the busbar 121 is connected to the sampling end 12221 of the temperature acquisition data line 1222, the fixing membrane 123 further includes a fourth hole 1234, and at least a portion of the sampling end 12221 of the temperature acquisition data line 1222 is accommodated in the fourth hole 1234. For example... Figures 3 to 8 As shown, since the sampling end 12221 of the temperature acquisition data line 1222 has a large thickness, at least a portion of the sampling end 12221 of the temperature acquisition data line 1222 can be accommodated by setting the fourth hole 1234, thereby saving space along the thickness direction of the fixed film 123.

[0103] In some embodiments, the fourth hole 1234 is typically large enough to accommodate a larger area of ​​the temperature acquisition data line 1222, thereby reducing the space occupied by that area and improving space utilization. Furthermore, the area of ​​the fixing film 123 near the fourth hole 1234 may also be provided with a through hole to accommodate the bent portion of the temperature acquisition data line 1222; or, the fourth hole 1234 may be large enough to accommodate the bent portion of the temperature acquisition data line 1222. Considering the relatively thick thickness of the bent portion of the temperature acquisition data line 1222, by providing the fourth hole 1234 or other holes to accommodate the bent portion of the temperature acquisition data line 1222, the space occupied by the bent portion of the temperature acquisition data line 1222 and the fixing film 123 along the thickness direction of the fixing film 123 can be further saved.

[0104] The battery cell 20 of the present application embodiment will now be described with reference to the accompanying drawings.

[0105] Figure 9 A schematic diagram of the structure of a battery cell 20 according to an embodiment of this application is shown. For example, the battery cell 20 is shown. Figure 9 The battery cell 20 shown can be any one of the battery cells 20 in the battery device 10 of this application embodiment. For example... Figure 9 As shown, the battery cell 20 may include at least one electrode terminal 202, which includes at least one positive electrode terminal 2021 and / or at least one negative electrode terminal 2022. The positive electrode terminal 2021 is used for electrical connection to the positive electrode tab of the electrode assembly, and the negative electrode terminal 2022 is used for electrical connection to the negative electrode tab of the electrode assembly. The positive electrode terminal 2021 and the positive electrode tab can be directly connected or indirectly connected, and the negative electrode terminal 2022 and the negative electrode tab can be directly connected or indirectly connected. For example, the positive electrode terminal 2021 can be electrically connected to the positive electrode tab through a current collector, and the negative electrode terminal 2022 can be electrically connected to the negative electrode tab through a current collector.

[0106] In some embodiments, the electrode terminals 202 may be located on any one or more walls of the battery cell 20, and the multiple electrode terminals 202 may be located on the same or different walls. For example, the battery cell 20 may include a housing 204, and the electrode terminals 202 are disposed on the first wall 201 of the housing 204.

[0107] The outer casing 204 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film. In some embodiments, the outer casing 204 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 204 is a non-sealed structure, it serves to protect the electrode assembly, and a sealing bag is included between the outer casing 204 and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 204 is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0108] In some embodiments, the housing 204 includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided one or more.

[0109] In some embodiments, a pressure relief mechanism 203 is provided on the casing 204 of the battery cell 20 of this application. The pressure relief mechanism 203 is used to release internal gas from the battery cell 20. As an example, the pressure relief mechanism 203 can be actuated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 203 performs an action or a weak structure provided in the pressure relief mechanism 203 is destroyed, thereby forming an opening or channel for internal pressure or temperature to be released. The threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 20.

[0110] The term "actuation" as used in this application refers to the pressure relief mechanism 203 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 203 may include, but are not limited to: movement of components within the pressure relief mechanism 203 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 203, etc. When the pressure relief mechanism 203 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as waste. This method enables pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0111] As an example, the pressure relief mechanism 203 can be integrally formed with the housing 204. As an example, the pressure relief mechanism 203 can also be separately disposed from and connected to the housing 204. Furthermore, the pressure relief mechanism 203 can be located on any wall of the housing 204. For example, as... Figure 9 As shown, this application embodiment takes the first wall 201 as an example with a pressure relief mechanism 203, but this application embodiment is not limited to this.

[0112] In some embodiments, such as Figure 9 As shown, the first wall 201 is provided with two electrode terminals 202, and the pressure relief mechanism 203 is located between the two electrode terminals 202. Placing the electrode terminals 202 and the pressure relief mechanism 203 on the same wall of the housing 204 can improve the integration of the battery cells 20 and facilitate processing. For example, the first wall 201 can be an end cap included in the housing 204, on which both the electrode terminals 202 and the pressure relief mechanism 203 are provided, facilitating processing and assembly. Furthermore, placing the pressure relief mechanism 203 between the two electrode terminals 202 makes the first wall 201 relatively symmetrical, facilitating the electrical connection of multiple busbar components 121 to the electrode terminals 202 of the multiple battery cells 20 of the battery cell assembly 200, thereby improving the processing and assembly efficiency of the battery device 10.

[0113] In some embodiments, when the housing 204 is a non-sealed structure, the pressure relief mechanism 203 can be configured as a through hole for discharging gas inside the battery cell 20.

[0114] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0115] In some embodiments, when a pressure relief mechanism 203 is provided on the first wall 201, the fixing membrane 123 further includes a fifth hole 1235 corresponding to the pressure relief mechanism 203. The fifth hole 1235 can be used to avoid the pressure relief mechanism 203 so that when the pressure relief mechanism 203 is actuated, the emissions discharged from the pressure relief mechanism 203 can be quickly discharged through the fifth hole 1235, reducing the obstruction of the fixing membrane 123 to the emissions, improving the emission efficiency of the emissions, thereby reducing the risk of thermal diffusion between multiple battery cells 20 and improving the reliability of the battery device 10.

[0116] In some embodiments, when the connection assembly 12 includes two rows of busbars 121, the fifth hole 1235 is located between the two rows of busbars 121; and / or, when the monitoring unit 122 includes two sets of data lines, the fifth hole 1235 is located between the two sets of data lines, so as to reduce the obstruction of the two sets of data lines to the emissions discharged by the pressure relief mechanism 203, and also reduce the impact of the high-temperature emissions on the two sets of data lines and the two rows of busbars 121, thereby improving the reliability of the battery device 10.

[0117] It should be understood that the structure, size, and number of parameters of the fifth hole 1235 of the fixed membrane 123 can be set according to the actual application. For example, the range of the orthographic projection of the fifth hole 1235 toward the first wall 201 is usually greater than or equal to the pressure relief mechanism 203, so that the fifth hole 1235 can fully expose the pressure relief mechanism 203 and reduce the obstruction effect of the fixed membrane 123 on the emissions.

[0118] In some embodiments, the shape of the fifth hole 1235 of the fixing membrane 123 can be configured according to the shape of the pressure relief mechanism 203. For example, the shape of the fifth hole 1235 projected onto the first wall 201 can be the same as or approximately the same as the shape of the pressure relief mechanism 203 on the surface of the first wall 201, to facilitate processing. For example, as Figure 9 As shown, on the surface of the first wall 201, the shape of the pressure relief mechanism 203 can be oval, and similarly, the shape of the orthographic projection of the fifth hole 1235 toward the first wall 201 can also be oval.

[0119] It should be understood that the number of fifth holes 1235 included in the fixing membrane 123 of this application embodiment can be set according to actual application.

[0120] In some embodiments, the fixing film 123 is provided with a plurality of fifth holes 1235 arranged along a first direction, and the plurality of fifth holes 1235 correspond one-to-one with the pressure relief mechanism 203 of the plurality of battery cells 20. Figures 3 to 8 As shown, each fifth hole 1235 corresponds to a pressure relief mechanism 203, so that the emissions discharged by the corresponding pressure relief mechanism 203 are discharged through the fifth hole 1235. In this way, the area occupied by all the fifth holes 1235 of the fixed membrane 123 is smaller, which can improve the structural strength and stability of the fixed membrane 123 and reduce the risk of local damage to the connecting assembly 12.

[0121] Or, different from Figures 3 to 8 In the embodiment shown, the fifth hole 1235 corresponds to the pressure relief mechanism 203 of multiple battery cells 20. That is, by setting the same fifth hole 1235, it can be used to avoid the pressure relief mechanism 203 of multiple battery cells 20, thereby reducing the number of fifth holes 1235 provided on the fixing film 123 for easier processing.

[0122] According to some embodiments of this application, this application also provides a battery device including a battery cell described in any of the above embodiments.

[0123] According to some embodiments of this application, this application also provides an electrical device, including the battery device described in any of the above embodiments, and the battery device is used to provide electrical energy to the electrical device.

[0124] The electrical device can be any of the aforementioned devices or systems that utilize battery devices.

[0125] This application provides an energy storage device 1, which may include one or more battery clusters to increase the voltage and capacity of the energy storage device 1. The battery cluster may include multiple battery devices 10 as described in any of the above embodiments. The multiple battery devices 10 are connected in series and / or in parallel via busbars to increase the voltage of the energy storage device 1. When the energy storage device 1 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 1.

[0126] The energy storage device 1 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 1 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 1 can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the use of the energy storage device 1.

[0127] In some embodiments, the energy storage device 1 is an energy storage container or an energy storage cabinet.

[0128] In some embodiments, the energy storage device 1 may include a cabinet and one or more battery clusters, with the battery clusters housed in the cabinet.

[0129] In some embodiments, the energy storage device 1 may further include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module. Exemplarily, at least some of the above modules may be housed within the storage chamber of the energy storage device 1.

[0130] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 10 via piping for regulating the temperature of the individual battery cells.

[0131] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0132] As an example, the central control module can serve as the battery management unit for energy storage device 1, used to monitor and manage it. The central control module can monitor information such as current, voltage, power, state of charge, and temperature of energy storage device 1. For example, it can control the charging and discharging current and voltage of energy storage device 1. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0133] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0134] As an example, the power distribution device can be used to distribute power to the power modules of the energy storage device 1.

[0135] According to some embodiments of this application, this application also provides an energy storage system, including the energy storage device 1 described in any of the above embodiments. Figure 10 A structural block diagram of an energy storage system according to an embodiment of this application is shown. In some embodiments, such as... Figure 10 As shown, the energy storage system may include one or more energy storage devices 1 and a power converter system (PCS) 2, wherein the power converter 2 is used to connect between the power generation device 3 and the energy storage device 1. The power generation device 3 is used to generate electrical energy, and the electrical energy generated by the power generation device 3 can be stored in the energy storage device 1 through the power converter 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of the power generation device 3 is not limited in this application.

[0136] According to some embodiments of this application, this application provides a charging network. Figure 11 A structural block diagram of a charging network according to an embodiment of this application is shown. Figure 11As shown, the charging network includes a charging pile 4 and an energy storage device 1. The charging pile 4 is electrically connected to the energy storage device 1, which provides power to the charging pile 4. The charging pile 4 is electrically connected to a battery device in the energy storage device 1 via a cable, allowing the battery device to supply its stored energy to the charging pile 4. The charging pile 4 has one or more connectors 5 for connecting to electrical devices (such as vehicles) to replenish their power.

[0137] The energy storage device 1 can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0138] According to some embodiments of this application, see Figures 3 to 8 This application provides a battery device 10, including: a battery cell assembly 200, the battery cell assembly 200 including a plurality of battery cells 20 arranged along a first direction, each battery cell 20 having an electrode terminal 202 disposed on a first wall 201; a plurality of busbars 121 for electrically connecting the electrode terminals 202 of the plurality of battery cells 20; and a monitoring unit 122 for collecting data from the plurality of battery cells 20; wherein the monitoring unit 122 is connected to the surface of the busbars 121 facing the first wall 201.

[0139] The monitoring unit 122 includes multiple voltage acquisition data lines 1221. The sampling end 12211 of the voltage acquisition data line 1221 is connected to the surface of the busbar 121 facing the first wall 201. The voltage acquisition data line 1221 is used to acquire the voltage of the busbar 121 to monitor the voltage of the battery cell 20 connected to the busbar 121.

[0140] The busbar component 121 includes a first electrode terminal connection area 1211, a second electrode terminal connection area 1212, a transition area 1213, and a voltage acquisition area 1214. The transition area 1213 is used to connect the first electrode terminal connection area 1211 and the second electrode terminal connection area 1212. The voltage acquisition area 1214 and the first electrode terminal connection area 1211 are located on the side of the transition area 1213 away from the second electrode terminal connection area 1212. The first electrode terminal connection area 1211 and the second electrode terminal connection area 1212 are respectively used to connect the electrode terminals 202 of the two battery cells 20. The sampling end 12211 of the voltage acquisition data line 1221 is connected to the surface of the voltage acquisition area 1214 facing the first wall 201.

[0141] The monitoring unit 122 further includes at least one temperature acquisition data line 1222. The sampling end 12221 of the temperature acquisition data line 1222 is connected to the surface of the busbar component 121 facing the first wall 201. The temperature acquisition data line 1222 is used to acquire the temperature of the busbar component 121 to monitor the temperature of the battery cell 20 connected to the busbar component 121. The sampling end 12221 of the temperature acquisition data line 1222 is connected to the surface of the transition region 1213 facing the first wall 201. The transition region 1213 protrudes in a direction away from the battery cell 20 relative to the first electrode terminal connection region 1211 and the second electrode terminal connection region 1212.

[0142] The battery device also includes a fixing membrane 123, with multiple busbar components 121 and a monitoring unit 122 located on the side of the fixing membrane 123 away from the battery cell 20. The fixing membrane 123 includes a first hole 1231, a second hole 1232, and a third hole 1233. The first hole 1231 corresponds to the first electrode terminal connection area 1211, the second hole 1232 corresponds to the second electrode terminal connection area 1212, and the third hole 1233 corresponds to the voltage acquisition area 1214. At least a portion of the sampling end 12211 of the voltage acquisition data line 1221 is accommodated in the third hole 1233. The first hole 1231 and the third hole 1233 are the same hole.

[0143] The monitoring unit 122 also includes at least one temperature acquisition data line 1222. The sampling end 12221 of the temperature acquisition data line 1222 is connected to the surface of the busbar 121 facing the first wall 201. The temperature acquisition data line 1222 is used to acquire the temperature of the busbar 121 to monitor the temperature of the battery cell 20 connected to the busbar 121. The fixing film 123 also includes a fourth hole 1234. At least a portion of the sampling end 12221 of the temperature acquisition data line 1222 is accommodated in the fourth hole 1234.

[0144] The first wall 201 is provided with a pressure relief mechanism 203, and the fixing membrane 123 also includes a fifth hole 1235 corresponding to the pressure relief mechanism 203. The fifth hole 1235 corresponds to the pressure relief mechanism 203 of the multiple battery cells 20. Alternatively, the fixing membrane 123 is provided with multiple fifth holes 1235 arranged along the first direction, and the multiple fifth holes 1235 correspond one-to-one with the pressure relief mechanism 203 of the multiple battery cells 20.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell assembly (200) includes a plurality of battery cells (20) arranged along a first direction, and each battery cell (20) has an electrode terminal (202) disposed on its first wall (201). Multiple busbar components (121) are used for electrically connecting the electrode terminals (202) of multiple battery cells (20); The monitoring unit (122) is used to collect data from multiple battery cells (20); The monitoring unit (122) is connected to the surface of the busbar component (121) facing the first wall (201).

2. The battery device according to claim 1, characterized in that, The monitoring unit (122) includes multiple voltage acquisition data lines (1221). The sampling end (12211) of the voltage acquisition data line (1221) is connected to the surface of the busbar (121) facing the first wall (201). The voltage acquisition data line (1221) is used to acquire the voltage of the busbar (121) to monitor the voltage of the battery cell (20) connected to the busbar (121).

3. The battery device according to claim 2, characterized in that, The busbar component (121) includes a first electrode terminal connection area (1211), a second electrode terminal connection area (1212), a transition area (1213), and a voltage acquisition area (1214). The transition area (1213) is used to connect the first electrode terminal connection area (1211) and the second electrode terminal connection area (1212). The voltage acquisition area (1214) is located on the side of the transition area (1213) away from the second electrode terminal connection area (1212). The first electrode terminal connection area (1211) and the second electrode terminal connection area (1212) are respectively used to connect the electrode terminals (202) of two battery cells (20). The sampling end (12211) of the voltage acquisition data line (1221) is connected to the surface of the voltage acquisition area (1214) facing the first wall (201).

4. The battery device according to claim 3, characterized in that, The monitoring unit (122) further includes at least one temperature acquisition data line (1222), the sampling end (12221) of the temperature acquisition data line (1222) is connected to the surface of the busbar (121) facing the first wall (201), and the temperature acquisition data line (1222) is used to acquire the temperature of the busbar (121) to monitor the temperature of the battery cell (20) connected to the busbar (121).

5. The battery device according to claim 4, characterized in that, The sampling end (12221) of the temperature acquisition data line (1222) is connected to the surface of the transition zone (1213) facing the first wall (201).

6. The battery device according to claim 4 or 5, characterized in that, The transition region (1213) protrudes in a direction away from the battery cell (20) relative to the first electrode terminal connection region (1211) and the second electrode terminal connection region (1212).

7. The battery device according to any one of claims 4 to 6, characterized in that, The battery device also includes a fixing membrane (123), with the plurality of the busbar components (121) and the monitoring unit (122) located on the side of the fixing membrane (123) away from the battery cell (20).

8. The battery device according to claim 7, characterized in that, The fixed membrane (123) includes a first hole (1231), a second hole (1232) and a third hole (1233). The first hole (1231) corresponds to the first electrode terminal connection area (1211), the second hole (1232) corresponds to the second electrode terminal connection area (1212), and the third hole (1233) corresponds to the voltage acquisition area (1214). At least a portion of the sampling end (12211) of the voltage acquisition data line (1221) is accommodated in the third hole (1233).

9. The battery device according to claim 8, characterized in that, The first hole (1231) and the third hole (1233) are the same hole.

10. The battery device according to claim 8 or 9, characterized in that, The monitoring unit (122) further includes at least one temperature acquisition data line (1222), the sampling end (12221) of which is connected to the surface of the busbar (121) facing the first wall (201). The temperature acquisition data line (1222) is used to acquire the temperature of the busbar (121) to monitor the temperature of the battery cell (20) connected to the busbar (121). The fixed membrane (123) further includes a fourth hole (1234), and at least a portion of the sampling end (12221) of the temperature acquisition data line (1222) is accommodated in the fourth hole (1234).

11. The battery device according to any one of claims 7 to 10, characterized in that, The first wall (201) is provided with a pressure relief mechanism (203), and the fixed membrane (123) further includes a fifth hole (1235) corresponding to the pressure relief mechanism (203). The fifth hole (1235) corresponds to the pressure relief mechanism (203) of the plurality of battery cells (20), or, The fixing film (123) is provided with a plurality of fifth holes (1235) arranged along the first direction, and the plurality of fifth holes (1235) correspond one-to-one with the pressure relief mechanism (203) of the plurality of battery cells (20).

12. The battery device according to any one of claims 7 to 11, characterized in that, The multiple busbar components (121) and the monitoring unit (122) are fixed to the fixing membrane (123) by hot pressing.

13. The battery device according to any one of claims 2 to 12, characterized in that, The length of the sampling end (12211) of the voltage acquisition data line (1221) connected to the bus component (121) ranges from [8mm, 16mm].

14. An energy storage device, characterized in that, include: Multiple battery devices according to any one of claims 1 to 13, the battery devices being used to store or provide electrical energy.

15. An energy storage system, characterized in that, include: Power conversion device; The energy storage device as claimed in claim 14, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

16. A charging network, characterized in that, include: Charging stations; The energy storage device as described in claim 14 or the energy storage system as described in claim 15, wherein the energy storage device is used to provide electrical energy to the charging pile.

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