Battery device, battery cell, electric device, energy storage device, energy storage system, and charging network

Abstract

The application is suitable for the technical field of batteries, and provides a battery device, a battery monomer, a power consumption 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 at least one battery monomer row, the battery monomer row comprises a plurality of battery monomers arranged along a first direction, the battery monomer comprises a shell, an electrode assembly and an electrode terminal, and the electrode assembly is arranged in the shell. The electrode terminal comprises a first part and a second part, the first part is insulatively arranged on a first wall of the shell along the first direction, and the second part is insulatively arranged on a second wall of the shell along a second direction. In the battery monomer row, the first parts of two battery monomers adjacent along the first direction are electrically connected. In this way, the size of the second part in the second direction can be reduced, so that the size of the electrode terminal protruding out of the first wall along the second direction can also be reduced, which helps to improve the energy density of the battery device.

Description

Technical Field

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

[0002] From a market perspective, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of battery devices continue to expand, the market demand is also constantly increasing. Furthermore, the capacity of battery devices is becoming larger, and the performance requirements for battery devices are becoming increasingly stringent.

[0003] In related technologies, battery devices typically include multiple battery cells, each including a housing and electrode assemblies disposed within the housing. In some cases, given a predetermined size for the electrode assemblies, the overall size of the battery cell is relatively large. This affects the energy density of the battery cell and reduces the utilization rate of the internal space of the battery device, thereby lowering the energy density of the battery device.

[0004] The above statements are for the purpose of providing background information in relation to this application only, and do not necessarily constitute prior art. Summary of the Invention

[0005] In view of the above problems, embodiments of this application provide a battery device, a battery cell, an electrical device, an energy storage device, an energy storage system, and a charging network, which can improve the energy density of the battery device.

[0006] In a first aspect, embodiments of this application provide a battery device, including a battery cell assembly and an information acquisition assembly. The battery cell assembly includes at least one battery cell row, and the battery cell row includes a plurality of battery cells arranged along a first direction. The battery cells include:

[0007] shell;

[0008] Electrode assembly, located inside the housing;

[0009] An electrode terminal includes a first portion and a second portion bent relative to the first portion. The first portion is insulated on a first wall of the housing along a first direction, and the second portion is insulated on a second wall of the housing along a second direction. At least one of the first portion and the second portion is electrically connected to an electrode assembly.

[0010] The information acquisition component is located on the second wall and electrically connected to the second part; in the battery cell row, the first parts of two adjacent battery cells along the first direction are electrically connected.

[0011] The first and second directions intersect.

[0012] The battery device provided in this application embodiment has a first portion of electrode terminals insulated on a first wall of the housing along a first direction, and a second portion of electrode terminals disposed on a second wall of the housing along a second direction. The second portion is used for electrical connection with an information acquisition component. A battery cell array includes multiple battery cells arranged along the first direction, and the first portions of the electrode terminals of two adjacent battery cells along the first direction are electrically connected. This allows the electrode terminals of two adjacent battery cells along the first direction to be electrically connected through the first portion, rather than being welded to a busbar component through the second portion. Thus, when designing the electrode terminals, it is unnecessary to consider the required weld depth between the second portion and the busbar component; that is, the second portion does not need to have a large dimension along the second direction, allowing its dimension in the second direction to be reduced, thereby reducing the dimension of the electrode terminals protruding beyond the first wall along the second direction. When the dimension of the electrode assembly along the second direction is predetermined, it helps to reduce the dimension of the battery cells in the second direction; conversely, when the dimension of the battery cells along the second direction is predetermined, it helps to increase the dimension of the electrode assembly along the second direction. Therefore, it helps to improve the energy density of the battery cells and also helps to improve the utilization rate of the internal space of the battery device in the second direction, thereby increasing the energy density of the battery device.

[0013] In some embodiments, in a battery cell array, the first portions of two adjacent battery cells along a first direction are welded together.

[0014] With this configuration, in the battery cell array, the first portions of two adjacent battery cells are welded along the first direction, allowing for seam welding between the first portions of the electrode terminals of two adjacent battery cells along the first direction. Therefore, the design of the first portion needs to consider the required weld penetration depth during the welding operation. Since the weld penetration direction of the first portion is primarily considered in the second direction, not the first direction, the first portion needs to have a larger dimension along the second direction. Based on this, the dimension of the first portion in the first direction can be reduced, and the dimension of the first portion protruding beyond the first wall along the first direction can also be reduced.

[0015] In some embodiments, the housing is provided with a mounting hole, which is disposed on at least one of the first wall and the second wall, and at least one of the first portion and the second portion is mounted in the mounting hole.

[0016] By adopting the above technical solution, the electrode terminals can be set on the housing in a very flexible manner, and the electrical connection between the electrode terminals and the electrode assembly can also be set in a very flexible manner.

[0017] In some embodiments, the mounting hole includes a first hole segment disposed on the first wall, and the first portion is mounted in the first hole segment;

[0018] And / or, the mounting hole includes a second hole segment disposed on the second wall, and the second part is mounted in the second hole segment.

[0019] By adopting the above technical solution, the mounting hole can be set up very flexibly, which makes the arrangement of electrode terminals on the housing very flexible.

[0020] In some embodiments, the electrode terminal includes a terminal body and a limiting portion disposed around the terminal body. The first part and the second part each include a portion of the terminal body and a portion of the limiting portion. The limiting portion located in the first part is disposed on a first wall, and the limiting portion located in the second part is disposed on a second wall. The terminal body located in at least one of the first part and the second part is mounted in a mounting hole, and the terminal body located in at least one of the first part and the second part is electrically connected to the electrode assembly.

[0021] In a battery cell array, the terminals of the first portions of two adjacent battery cells along the first direction are electrically connected.

[0022] The battery cell also includes a first insulating member, one part of which is disposed between the first wall and the limiting part located in the first part, and the other part is disposed between the second wall and the limiting part located in the second part.

[0023] This arrangement allows the first insulating element to be positioned between the housing and the electrode terminals, thereby achieving insulation between the electrode terminals and the housing.

[0024] In some embodiments, the first insulating element includes at least one of a sealant and an insulating adhesive.

[0025] This configuration enables insulation between the outer casing and the electrode terminals.

[0026] In some embodiments, the battery cell further includes a second insulating member, which is fixedly connected to at least one of the first wall and the second wall, and is at least partially confined to the side of the limiting portion away from the first insulating member.

[0027] This configuration allows the electrode terminals to be fixed to the housing via a second insulating element.

[0028] In some embodiments, a second insulating member is disposed around an electrode terminal, and a first groove is provided on the side of the second insulating member near the electrode assembly. A limiting portion is located within the first groove, and the limiting portion is located between the side of the first insulating member away from the electrode assembly and the bottom wall of the first groove.

[0029] This configuration ensures that the electrode terminals can be securely fixed to the second insulating member, and that the electrode terminals can be securely fixed to the outer casing via the second insulating member.

[0030] In some embodiments, the housing has a second groove extending to the mounting hole on the side away from the electrode assembly, a second insulating member is confined within the second groove, and a first insulating member is confined between the bottom wall of the second groove and the limiting portion.

[0031] This configuration helps to increase the energy density of individual battery cells and also helps to improve the utilization rate of the internal space of the battery device in the first direction, thereby increasing the energy density of the battery device.

[0032] In some embodiments, the second groove is disposed around the mounting hole, the second insulating member is disposed around the electrode terminal, and the second insulating member is limited by the groove sidewall of the second groove.

[0033] This design, on the one hand, allows the outer peripheral wall of the second insulator to be limited by the inner peripheral wall of the second groove, thereby facilitating the fixation of the second insulator to the outer casing. Furthermore, it reduces the size of the first portion protruding beyond the first wall in the first direction, and the size of the second portion protruding beyond the second wall in the second direction, thereby helping to improve the energy density of the battery cell and the utilization rate of the internal space of the battery device, thus increasing the energy density of the battery device.

[0034] In some embodiments, the housing includes a housing and an end cap, the end cap including a second wall and a first wall bent relative to the second wall, the second wall being disposed at an end of the housing along a second direction, the first wall being disposed on a third wall of the housing along a first direction, and the electrode assembly being disposed within the space formed by the housing and the end cap.

[0035] This configuration allows the electrode terminals to be positioned on the end cap; specifically, both the first and second portions of the electrode terminals are located on the end cap. This allows the electrode terminals to be installed on the end cap first, and then the end cap to be closed onto the housing, facilitating the assembly of the battery cells.

[0036] In some embodiments, the housing has a notch at one end facing the second wall in the second direction, at least a portion of the notch is provided on the third wall, and the first wall is mounted on the notch.

[0037] By mounting the first wall within the notch, at least a portion of the first wall can be inserted into the third wall along the first direction. This helps reduce the size of the first wall protruding beyond the third wall along the first direction away from the electrode assembly. Consequently, given a predetermined size of the electrode assembly along the first direction, this helps reduce the size of the individual battery cell in the first direction; conversely, given a predetermined size of the individual battery cell along the first direction, it helps increase the size of the electrode assembly along the first direction. This arrangement helps reduce the energy density of the individual battery cells and also helps improve the utilization rate of the internal space of the battery device in the first direction, thereby increasing the energy density of the battery device.

[0038] In some embodiments, the thickness of the first wall is greater than the thickness of the third wall, and the first wall extends inward beyond the third wall along a first direction.

[0039] This configuration helps to reduce the size of the first wall protruding beyond the third wall in the direction away from the electrode assembly along the first direction. Therefore, given a predetermined size of the electrode assembly along the first direction, this helps to reduce the size of the individual battery cell in the first direction; conversely, given a predetermined size of the individual battery cell along the first direction, this helps to increase the size of the electrode assembly along the first direction. This configuration helps to reduce the energy density of the individual battery cells and also helps to improve the utilization rate of the internal space of the battery device in the first direction, thereby increasing the energy density of the battery device.

[0040] In some embodiments, the electrode assembly includes:

[0041] The main body has a third groove on its end side along the first direction, and part of the first wall is located in the third groove;

[0042] A tab is disposed on the main body and electrically connected to at least one of the first part and the second part.

[0043] With this configuration, the first wall extends inward beyond the third wall along the first direction, and at least a portion of the first wall is recessed into the third groove. This eliminates the need to reduce the overall size of the electrode assembly along the first direction, thereby helping to improve the energy density of the battery cell.

[0044] In some embodiments, at least a portion of the tab is located within a third groove.

[0045] By having at least a portion of the tab disposed within the third groove, the tab can reasonably occupy the internal space of the battery cell without the tab extending excessively beyond the main body along the first or second direction. This helps to reduce the size of the battery cell along the first and second directions, given a predetermined size of the main body, thereby helping to improve the energy density of the battery cell.

[0046] In some embodiments, the main body includes a positive electrode and a negative electrode, both of which are connected to tabs. The positive and negative electrodes are alternately stacked along a third direction, which intersects with the first and second directions, respectively.

[0047] The main body is formed by alternating layers of positive and negative electrode sheets, which facilitates the formation of a third groove on the end side of the main body along the first direction, and also facilitates the arrangement of at least a portion of the tab within the third groove.

[0048] In some embodiments, the electrode terminals include a positive electrode terminal and a negative electrode terminal. In a single battery cell, a first portion of the positive electrode terminal and a first portion of the negative electrode terminal are respectively disposed on two first walls of the housing along a first direction, and a second portion of the positive electrode terminal and a second portion of the negative electrode terminal are disposed at intervals on the same second wall of the housing along a second direction.

[0049] This configuration places the first portions of the positive and negative electrode terminals at opposite ends of the casing along the first direction, facilitating the welding of electrode terminals between any two cells in the battery cell array to achieve electrical connection of multiple cells in the array. Furthermore, the second portions of the positive and negative electrode terminals are located at the same end of the casing along the second direction, facilitating the acquisition and monitoring of data such as voltage, current, and temperature of the multiple cells in the battery cell array.

[0050] In some embodiments, the battery cell assembly includes multiple rows of battery cells arranged along a third direction, which intersects the first direction and the second direction, respectively.

[0051] The battery device also includes a busbar, the first portion of two adjacent rows of battery cells are electrically connected through the busbar, and at least a portion of the busbar and the battery cells are arranged along a first direction.

[0052] By arranging at least a portion of the busbar and the battery cells along a first direction, such that the busbar is located at the end of the battery cell array along the first direction, the size of the battery cells along the second direction can be reduced given a predetermined size of the electrode assembly, thereby helping to increase the energy density of the battery cells and thus increasing the energy density of the battery device.

[0053] In some embodiments, the battery device further includes a housing, which includes a housing body and a cover. In a second direction, the cover is disposed at one end of the housing body near a second wall, and the battery cell assembly is disposed within the space enclosed by the housing body and the cover.

[0054] The battery device also includes a first adhesive layer, which is bonded between the cover and the second wall of the outer casing near the cover to fix the cover and the battery cell assembly, and the first adhesive layer avoids the setting of the information collection component.

[0055] This design secures the individual battery cells to the cover, allowing the cover to constrain the cells and prevent expansion. This eliminates the need for steel strips and pressure bars, thus contributing to increased energy density of the battery device.

[0056] In some embodiments, in the second direction, a second adhesive layer is bonded between the wall of the outer casing away from the cover and the body of the box.

[0057] This configuration allows the battery cell assembly to be bonded to the main body of the box via the second adhesive layer and to the cover via the first adhesive layer. The cover is then fixed to the main body of the box, thus fixing the main body of the box, the battery cell assembly, and the cover into a single unit. This allows the main body of the box and the cover to jointly constrain the battery cell assembly and resist its expansion.

[0058] In some embodiments, the housing body includes two first sidewalls opposite each other along a first direction and two second sidewalls opposite each other along a third direction, and the battery cell assembly is located between the two first sidewalls along the first direction and between the two second sidewalls along the third direction.

[0059] Among them, the third direction intersects with the first direction and the second direction respectively.

[0060] By setting two first sidewalls and two second sidewalls, the battery cell assembly is confined within the main body of the box along the first and third directions. This helps to further fix the main body of the box, the battery cell assembly, and the cover into a whole. Thus, the main body of the box and the cover together constrain the battery cell assembly to resist its expansion.

[0061] Secondly, embodiments of this application provide a battery cell, including a casing;

[0062] Electrode assembly, located inside the housing;

[0063] An electrode terminal includes a first portion and a second portion bent relative to the first portion. The first portion is insulated on a first wall of the housing along a first direction, and the second portion is insulated on a second wall of the housing along a second direction. At least one of the first portion and the second portion is electrically connected to an electrode assembly.

[0064] The second part is used to be electrically connected to the information acquisition component, and the first part is used to be electrically connected to the first part of the battery cell adjacent to the first direction.

[0065] The first and second directions intersect.

[0066] The battery cell provided in this application embodiment is insulated on a first wall of the casing along a first direction by a first portion of the electrode terminal, and a second portion of the electrode terminal is disposed on a second wall of the casing along a second direction. The second portion is used for electrical connection with an information acquisition component, so that the electrode terminals of two adjacent battery cells along the first direction can be electrically connected through the first portion, rather than being welded to the busbar component through the second portion. Thus, when designing the electrode terminals, there is no need to consider the required weld depth when welding the second portion to the busbar component; that is, the second portion does not need to have a large dimension along the second direction, allowing its dimension in the second direction to be reduced, thereby reducing the dimension of the electrode terminal protruding beyond the first wall along the second direction. When the dimension of the electrode assembly along the second direction is predetermined, it helps to reduce the dimension of the battery cell in the second direction; when the dimension of the battery cell along the second direction is predetermined, it helps to increase the dimension of the electrode assembly along the second direction. Therefore, it helps to improve the energy density of the battery cell and also helps to improve the utilization rate of the internal space of the battery device in the second direction, thereby increasing the energy density of the battery device.

[0067] Thirdly, embodiments of this application provide an electrical device, including a battery device or a battery cell.

[0068] The electrical device provided in this application, by employing the battery device or battery cell mentioned above, helps to improve the energy density of the battery cell or battery device, thereby improving the reliability of the electrical device.

[0069] Fourthly, embodiments of this application provide an energy storage device, including a battery device or a battery cell, which is used to store or provide electrical energy.

[0070] The energy storage device provided in this application, by employing the battery device or battery cell mentioned above, helps to improve the energy density of the energy storage device.

[0071] Fifthly, embodiments of this application provide an energy storage system, including a power conversion device and an energy storage device. The power conversion device is used to connect to the energy storage device to perform power conversion on current input to the energy storage device or output from the energy storage device.

[0072] The energy storage system provided in this application, by employing the energy storage device described above, helps to improve the energy density of the energy storage system.

[0073] Sixthly, embodiments of this application provide a charging network, including charging piles, and including an energy storage device or energy storage system, wherein the energy storage device is used to provide electrical energy to the charging piles.

[0074] The charging network provided in this application embodiment, by employing the energy storage device or energy storage system mentioned above, helps to improve the energy density of the charging network.

[0075] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0076] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0077] Figure 1 Schematic diagram of an energy storage system provided for some embodiments of this application;

[0078] Figure 2 A schematic diagram of a charging network provided for some embodiments of this application;

[0079] Figure 3 A schematic diagram of a vehicle provided for some embodiments of this application;

[0080] Figure 4 This application provides perspective structural diagrams of battery devices according to some embodiments.

[0081] Figure 5 for Figure 4 A partial 3D structural diagram of the provided battery device;

[0082] Figure 6 for Figure 4 A three-dimensional structural diagram of multiple battery cells and busbar components of the provided battery device;

[0083] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0084] Figure 8 A three-dimensional structural diagram of a battery cell provided in some embodiments of this application;

[0085] Figure 9 for Figure 8 Exploded view;

[0086] Figure 10 for Figure 9 Enlarged view of point B in the middle;

[0087] Figure 11 for Figure 8 Sectional view along CC;

[0088] Figure 12 for Figure 11 Enlarged view of point D in the middle.

[0089] The following are the labeling elements in the figure:

[0090] 1000 - Energy storage system; 1100 - Power conversion device; 1200 - Power generation device; 2000 - Charging network; 2100 - Charging pile; 2200 - Connector; 3000 - Vehicle; 3100 - Controller; 3200 - Motor; 100 - Energy storage device; 10 - Battery device; 1 - Battery cell; 101 - Mounting hole; 1011 - First hole section; 1012 - Second hole section; 102 - First groove; 103 - Second groove; 104 - Notch; 105 - Third groove; 11 - Electrode assembly; 111 - Main body; 112 - Tab; 12 - Housing; 1 21-Shell; 1211-Third wall; 1212-Fourth wall; 122-End cap; 1221-First wall; 1222-Second wall; 13-Electrode terminal; 131-Terminal body; 132-Limiting part; 14-First insulating component; 15-Second insulating component; 2-Box body; 21-Box body; 211-First side wall; 212-Second side wall; 22-Cover body; 3-Busting component; 4-First adhesive layer; 5-Information acquisition component; M-First part; N-Second part; U-Battery cell assembly; V-Battery cell array; Y-First direction; Z-Second direction; X-Third direction. Detailed Implementation

[0091] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 intended to explain this application, and should not be construed as limiting this application.

[0092] Unless otherwise specified, all implementation methods and optional implementation methods of the embodiments of this application can be combined with each other to form new technical solutions, provided that there is no conflict.

[0093] Unless otherwise specified, all technical features and optional technical features of the embodiments of this application can be combined with each other to form new technical solutions in the absence of conflict.

[0094] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0095] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0096] In the description of the embodiments of this application, "multiple" means two or more, and unless otherwise explicitly specified, "two or more" includes two. Correspondingly, "multiple groups" means two or more groups, including two groups.

[0097] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0098] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "proximity" and "adjacent" refer to proximity in location. For example, among three components A1, A2, and B, if the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, meaning A2 is adjacent to B. Alternatively, B can be said to be adjacent to A2; in other words, A2 is adjacent to B. Similarly, when there are multiple components C, namely C1, C2, ... CN, if one component C, such as C2, is closer to component B than the other components C, then B is adjacent to C2; in other words, C2 is adjacent to B.

[0099] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0100] From a market perspective, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of battery devices continue to expand, the market demand is also constantly increasing. Furthermore, the capacity of battery devices is becoming larger, and the performance requirements for battery devices are becoming increasingly stringent.

[0101] The battery device can be a power battery or an energy storage battery.

[0102] In related technologies, battery devices typically include multiple battery cells, each including a housing and electrode assemblies disposed within the housing. In some cases, given a predetermined size for the electrode assemblies, the overall size of the battery cell is relatively large. This affects the energy density of the battery cell and reduces the utilization rate of the internal space of the battery device, thereby lowering the energy density of the battery device.

[0103] For example, a battery cell has dimensions in the height, thickness, and width directions. If the overall height of the battery cell is large when the height of the electrode assembly is predetermined, this affects the energy density of the battery cell and reduces the utilization rate of the internal space of the battery device in the height direction, thus lowering the overall energy density of the battery device.

[0104] Specifically, the battery cell also includes electrode terminals, which are disposed on the end wall of the casing along the height direction. A busbar component is provided on the end wall of the electrode terminals along the height direction, and the electrode terminals are electrically connected to the electrode assembly. In the battery device, the electrode terminals are welded to the busbar component so that multiple battery cells are electrically connected through the busbar component. It should be noted that the electrode terminals need to have a larger dimension along the height direction of the battery cell to achieve a greater weld penetration, thus enabling welding between the electrode terminals and the busbar component. However, this design inevitably results in the electrode terminals protruding significantly beyond the casing along the height direction of the battery cell. Consequently, given a predetermined height of the electrode assembly, the height of the battery cell is larger; conversely, given a predetermined height of the battery cell, the height of the electrode assembly is smaller. This affects the energy density of the battery cell and reduces the utilization rate of the internal space of the battery device along the height direction of the battery cell, thereby reducing the energy density of the battery device.

[0105] Based on the above considerations, embodiments of this application provide a battery device, a battery cell, an electrical device, an energy storage device, an energy storage system, and a charging network. A first portion of the electrode terminal is insulated and disposed on a first wall of the housing along a first direction, and a second portion of the electrode terminal is disposed on a second wall of the housing along a second direction. The second portion is used for electrical connection with an information acquisition component. The battery cell array includes multiple battery cells arranged along the first direction, and the first portions of the electrode terminals of two adjacent battery cells along the first direction are electrically connected. This allows the electrode terminals of two adjacent battery cells along the first direction to be electrically connected through the first portion, rather than by welding to a busbar component through the second portion. Thus, when designing the electrode terminals, it is unnecessary to consider the required weld depth when welding the second portion to the busbar component; that is, the second portion does not need to have a large dimension along the second direction, allowing its dimension in the second direction to be reduced, thereby reducing the dimension of the electrode terminal protruding beyond the first wall along the second direction. When the dimension of the electrode assembly along the second direction is predetermined, it helps to reduce the dimension of the battery cell in the second direction; conversely, when the dimension of the battery cell along the second direction is predetermined, it helps to increase the dimension of the electrode assembly along the second direction. Therefore, it helps to improve the energy density of individual battery cells and also helps to improve the utilization rate of the internal space of the battery device in the second direction, thereby increasing the energy density of the battery device.

[0106] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar. A mixed connection refers to multiple battery cells being connected in both series and parallel connections.

[0107] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0108] In some embodiments, the battery cell assembly or battery device can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties. As an example, the battery cell assembly can have end plate structures and side plate structures at both ends and both sides, respectively.

[0109] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0110] The battery cell in this application refers to the smallest unit used for storing and outputting electrical energy. This battery cell can be a secondary battery or a primary battery. A secondary battery is a battery cell that can be recharged after discharge to reactivate its active materials and continue to be used.

[0111] The battery cells can be cylindrical, flat, cuboid, or other shapes. Battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0112] The battery cells or battery devices involved in the embodiments of this application can be used in energy storage devices that use battery cells or battery devices as energy storage elements.

[0113] The energy storage devices described in this application can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device can store electrical energy as needed and output it at appropriate times. For example, the energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0114] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0115] In some embodiments, the energy storage device may include one or more battery clusters, and the battery clusters may include multiple battery devices.

[0116] In some embodiments, multiple battery devices in a battery cluster can be connected in series via a busbar to improve the voltage and capacity of the energy storage device.

[0117] In some embodiments, when the energy storage device includes multiple battery clusters, the multiple battery clusters can be connected in parallel to increase the capacity of the energy storage device.

[0118] In some embodiments, the energy storage device may further include a cabinet in which the battery clusters are housed.

[0119] In some embodiments, the energy storage device 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.

[0120] In some embodiments, the thermal management module may include a liquid cooling unit that provides coolant to each battery device via piping for regulating the temperature of individual battery cells.

[0121] In some embodiments, 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 example, the main control module 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.

[0122] In some embodiments, the central control module can serve as the battery management unit of the energy storage device, used for monitoring and managing the energy storage device. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device. For example, the central control module can control the charging and discharging current and voltage of the energy storage device. 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.

[0123] In some embodiments, the fire protection module may include a control panel, detectors, alarm devices, etc., for detecting, alarming, or extinguishing fires in the energy storage device.

[0124] In some embodiments, the power distribution module can be used to distribute power to modules in the energy storage device that require electricity.

[0125] The energy storage system involved in the embodiments of this application can be any power system that requires energy storage devices.

[0126] In some embodiments, the energy storage system involved in this application may include an energy storage device and a power converter system (PCS). The power converter is used to connect to the energy storage device to perform power conversion on the current input to the energy storage device or output from the energy storage device.

[0127] Specifically, the energy storage system can be connected to the power grid or microgrid; or, the energy storage system can be coupled to a power generation device; or, the energy storage system can be connected to electrical equipment. The number of energy storage devices can be one or more.

[0128] In some embodiments, please refer to Figure 1 , Figure 1 This is a schematic diagram of an energy storage system 1000 provided in some embodiments of this application. A power conversion device 1100 is connected between a power generation device 1200 and an energy storage device 100. The power generation device 1200 generates electrical energy, the energy storage device 100 stores electrical energy, and the power conversion device 1100 performs power conversion on the current input to the energy storage device 100 or the current output from the energy storage device 100. The electrical energy generated by the power generation device 1200 can be stored in the energy storage device 100 through the power conversion device 1100, and the electrical energy stored in the energy storage device 100 can also be output to a load or the power grid through the power conversion device 1100. The number of energy storage devices 100 can be one or more.

[0129] As an example, the power generation device 1200 can specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc.

[0130] In some embodiments, please refer to Figure 2 , Figure 2 This is a schematic diagram of a charging network 2000 provided in some embodiments of this application. The charging network 2000 involved in the embodiments of this application may include a charging pile 2100 and an energy storage device 100. The charging pile 2100 is electrically connected to the energy storage device 100, and the energy storage device 100 is used to provide electrical energy to the charging pile 2100.

[0131] The charging pile 2100 and the battery device in the energy storage device 100 can be electrically connected by a cable, and the battery device can provide the electrical energy stored in it to the charging pile 2100.

[0132] The charging pile 2100 may have one or more connectors 2200, which are used to connect to electrical devices (such as vehicles) so as to provide power to the electrical devices.

[0133] The energy storage device 100 can be located inside the charging pile 2100 (e.g., an integrated energy storage and charging unit) or outside the charging pile 2100.

[0134] The battery cell and battery device provided in this application embodiment can also be used in electrical devices that use the battery cell or battery device as a power source.

[0135] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, vehicles, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Based on the power source, vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Based on the drive method, vehicles can be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0136] For ease of description, this application uses a vehicle as an example to illustrate the embodiments of the electrical device.

[0137] In some embodiments, please refer to Figure 3 , Figure 3 This is a schematic diagram of a vehicle 3000 provided in some embodiments of this application. A battery device 10 is disposed inside the vehicle 3000, and the battery device 10 may be located at the bottom, front, or rear of the vehicle 3000. The battery device 10 can be used to power the vehicle 3000; for example, the battery device 10 can serve as the operating power source for the vehicle 3000. The vehicle 3000 may also include a controller 3100 and a motor 3200. The controller 3100 is used to control the battery device 10 to supply power to the motor 3200, for example, to meet the power needs of the vehicle 3000 during startup, navigation, and driving.

[0138] In some embodiments, the battery device 10 can not only serve as the operating power source for the vehicle 3000, but also as the driving power source for the vehicle 3000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 3000.

[0139] In some embodiments, please refer to the following: Figure 4 and Figure 5 , Figure 4 This is a perspective structural diagram of the battery device 10 provided in some embodiments of this application. Figure 5 for Figure 4 A partial perspective view of the battery device 10 is provided. The battery device 10 may include a housing 2 and a battery cell 1. The housing 2 is a structure with internal space, and the internal space of the housing 2 is used to accommodate the battery cell 1.

[0140] The box 2 can adopt various structures. In some embodiments, the box 2 may include a main body 21 and a lid 22, which cover each other and jointly define the internal space of the box 2, which is a closed space. Here, "closed" means covered or shut off; it can be sealed or unsealed. That is, the box 2 can be a sealed structure or an unsealed structure. Both the main body 21 and the lid 22 can be hollow structures with an opening at one end, with the open side of the main body 21 covering the open side of the lid 22, so that the main body 21 and the lid 22 jointly define the internal space of the box 2. Alternatively, the main body 21 can be a hollow structure with an opening at one end, and the lid 22 can be a plate-like structure, covering the open side of the main body 21, so that the main body 21 and the lid 22 jointly define the internal space of the box 2. The box 2 composed of the main body 21 and the lid 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0141] In some embodiments, multiple battery cells 1 can be connected in series, parallel, or mixed to form a whole, and then the whole formed by the multiple battery cells 1 (battery cell assembly U) is directly housed in the internal space of the housing 2. In other embodiments, multiple battery cells 1 can also be connected in series, parallel, or mixed and arranged in a fixed manner to form a battery module (battery cell assembly U), and the battery module is housed in the internal space of the housing 2.

[0142] In some embodiments, please combine Figures 3 to 5 The housing 2 of the battery pack 10 can be part of the chassis structure of the vehicle 3000. For example, a portion of the housing 2 can be at least a portion of the floor of the vehicle 3000, or a portion of the housing 2 can be at least a portion of the crossbeams and longitudinal beams of the vehicle 3000.

[0143] Please refer to the following: Figure 4 and Figure 5 The battery device 10 provided in this application embodiment includes a battery cell assembly U, the battery cell assembly U includes at least one battery cell row V, and the battery cell row V includes a plurality of battery cells 1 arranged along a first direction Y.

[0144] A battery cell row V refers to a row of battery cells 1 arranged along the first direction Y.

[0145] A battery cell assembly U may include one battery cell array V or multiple battery cell arrays V. When the battery cell assembly U includes multiple battery cell arrays V, the multiple battery cell arrays V may be arranged along a third direction X, but are not limited to this.

[0146] In this case, the first direction Y intersects with the third direction X. As an example, the first direction Y is perpendicular to the third direction X.

[0147] Please refer to the following: Figure 4 and Figure 5 The battery device 10 also includes an information acquisition component 5.

[0148] The information acquisition component 5 refers to a structure electrically connected to the battery cell assembly U. The information acquisition component 5 is used to collect data such as voltage, current, and temperature of the battery cell assembly U. The information acquisition component 5 may include an information acquisition circuit board or an information acquisition wiring harness. The information acquisition circuit board may be, but is not limited to, a flexible printed circuit board (FPC).

[0149] Please refer to the following: Figures 6 to 12 ,in, Figure 6 for Figure 4 A three-dimensional structural diagram of the multiple battery cells 1 and the current collector 3 of the provided battery device 10. Figure 7 for Figure 6 Enlarged view of point A in the middle. Figure 8 This is a perspective structural diagram of a battery cell 1 provided in some embodiments of this application. Figure 9 for Figure 8 The exploded diagram, Figure 10 for Figure 9 Enlarged view at point B in the middle. Figure 11 for Figure 8 Sectional view along CC, Figure 12 for Figure 11 Enlarged view at point D. The battery cell 1 includes a housing 12, an electrode assembly 11, and electrode terminals 13. The electrode assembly 11 is disposed within the housing 12. The electrode terminal 13 includes a first portion M and a second portion N bent relative to the first portion M. The first portion M is insulated on a first wall 1221 of the housing 12 along a first direction Y, and the second portion N is insulated on a second wall 1222 of the housing 12 along a second direction Z. The electrode terminal 13 is electrically connected to the electrode assembly 11. Specifically, at least one of the first portion M and the second portion N is electrically connected to the electrode assembly 11. An information acquisition component 5 is disposed on the second wall 1222 and is electrically connected to the second portion N. In the battery cell array V, the first portions M of the electrode terminals 13 of two adjacent battery cells 1 along the first direction Y are electrically connected. The first direction Y and the second direction Z intersect.

[0150] Electrode assembly 11 is the component in the battery cell 1 where the electrochemical reaction occurs. Electrode assembly 11 is mainly formed by winding or stacking positive and negative electrode sheets, with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body 111 of electrode assembly 11, while the portions of the positive and negative electrode sheets without active material each constitute a tab 112. The tab 112 of the positive electrode sheet is the positive tab, and the tab 112 of the negative electrode sheet is the negative tab. The positive and negative tabs can be located together at one end of the main body 111; alternatively, they can be located at opposite ends of the main body 111.

[0151] In this battery cell 1, the number of electrode components 11 can be one, such as... Figure 9 and Figure 10 As shown. Alternatively, the number of electrode assemblies 11 in a single battery cell 1 can also be multiple.

[0152] The battery cell 1 may further include an electrolyte, which acts as a conductor of ions between the positive and negative electrode plates. The electrolyte described in this embodiment may be liquid, gel-like, or solid.

[0153] The outer casing 12 defines the internal environment of the battery cell 1, which houses the electrode assembly 11 and the electrolyte. The outer casing 12 can be either a sealed or unsealed structure. As an example, when the outer casing 12 is a sealed structure, it protects the electrode assembly 11 and, to some extent, prevents leakage such as electrolyte leakage. As an example, when the outer casing 12 is unsealed, it still protects the electrode assembly 11, and a sealing bag may be included between the outer casing 12 and the electrode assembly 11. This sealing bag encapsulates the electrode assembly 11 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating structure, an aluminum-plastic film, or the like.

[0154] Electrode terminal 13 refers to a component with conductive properties. Electrode terminal 13 serves as the current transmission terminal of battery cell 1 for transmitting current. Electrode terminal 13 may be, but is not limited to, a pole.

[0155] Electrode terminal 13 is electrically connected to electrode assembly 11, specifically, electrode terminal 13 is electrically connected to electrode tab 112 of electrode assembly 11. Electrode terminal 13 can be directly electrically connected to electrode tab 112 by means of welding, bonding, etc. Figure 11 and Figure 12As shown; alternatively, a transition structure can also be provided between electrode terminal 13 and tab 112. This transition structure facilitates the connection between electrode terminal 13 and tab 112, allowing current to pass through, thereby indirectly achieving an electrical connection between electrode terminal 13 and tab 112. The transition structure refers to a conductive metal structure, such as, but not limited to, a copper busbar. Electrical connections can be achieved between the transition structure and tab 112, and between the transition structure and electrode terminal 13, through welding, bonding, or other methods.

[0156] Electrode terminals 13 may include a positive electrode terminal and a negative electrode terminal. For example, there may be two electrode terminals 13, one for the positive electrode and one for the negative electrode. Figures 5 to 12 As shown. Both the positive electrode terminal and the negative electrode terminal are electrically connected to the electrode assembly 11. Specifically, the positive electrode terminal is electrically connected to the positive electrode tab, and the negative electrode terminal is electrically connected to the negative electrode tab.

[0157] The first part M and the second part N are the two portions of the electrode terminal 13. Understandably, the electrode terminal 13 is bent to divide it into two opposing bent portions, namely the first part M and the second part N. Understandably, the first part M and the second part N are electrically connected.

[0158] The electrode assembly 11 is electrically connected to the first part M, such as... Figure 11 and Figure 12 As shown. Alternatively, electrode assembly 11 is electrically connected to the second part N. Alternatively, electrode assembly 11 is electrically connected to the first part M and the second part N.

[0159] The first wall 1221 is a solid wall on the end side of the outer casing 12 along the first direction Y. It can be understood that the first wall 1221 is provided at least at one end of the outer casing 12 along the first direction Y. The first part M is insulatedly disposed on the first wall 1221 of the outer casing 12 along the first direction Y, which means that the first part M is disposed on the first wall 1221, and the first part M and the first wall 1221 are insulated from each other.

[0160] The second wall 1222 is a solid wall on the end side of the outer casing 12 along the second direction Z. It can be understood that the outer casing 12 has a second wall 1222 at at least one end along the second direction Z. The second portion N is insulated on the second wall 1222 of the outer casing 12 along the second direction Z, meaning that the second portion N is disposed on the second wall 1222, and the second portion N is insulated from the second wall 1222.

[0161] Understandably, the battery cell 1 also includes a first insulating member 14, a portion of which is disposed between the first wall 1221 and the first part M, and another portion of which is disposed between the second part N and the second wall 1222, so as to achieve insulation between the housing 12 and the electrode terminal 13.

[0162] In at least one battery cell 1, a first wall 1221 is provided at each of the opposite ends of the outer casing 12 along the first direction Y. A first portion M of the positive electrode terminal is disposed on the first wall 1221 at one end of the outer casing 12, and a first portion M of the negative electrode terminal is disposed on the first wall 1221 at the other end of the outer casing 12. Second portions N of the positive electrode terminal and the second portions N of the negative electrode terminal are disposed on corresponding second walls 1222. Figures 5 to 12 As shown. Alternatively, in at least one battery cell 1, a first wall 1221 is provided at one end of the casing 12 along the first direction Y, and a first portion M of the positive electrode terminal is provided on the first wall 1221. Alternatively, in at least one battery cell 1, a first wall 1221 is provided at one end of the casing 12 along the first direction Y, and a first portion M of the negative electrode terminal is provided on the first wall 1221.

[0163] The outer casing 12 has a second wall 1222 at one end along the second direction Z. The first portion M of the positive electrode terminal and the first portion M of the negative electrode terminal are respectively disposed on the corresponding first wall 1221, and the second portion N of the positive electrode terminal and the second portion N of the negative electrode terminal are disposed on the same second wall 1222. Figures 5 to 12 As shown. Alternatively, the outer casing 12 has a second wall 1222 at each of its opposite ends along the second direction Z. The first part M of the positive electrode terminal and the first part M of the negative electrode terminal are respectively disposed on the corresponding first wall 1221. The second part N of the positive electrode terminal is disposed on one of the second walls 1222, and the second part N of the negative electrode terminal is disposed on the other second wall 1222.

[0164] Understandably, in the battery cell array V, the electrode terminals 13 of two adjacent battery cells 1 along the first direction Y are respectively the positive electrode terminal and the negative electrode terminal, and the first part M of the positive electrode terminal and the first part M of the negative electrode terminal are arranged along the first direction Y and electrically connected.

[0165] Among them, the first part M of the electrode terminals 13 of two adjacent battery cells 1 along the first direction Y can be directly welded together, or they can be electrically connected through conductive adhesive, busbar components, etc.

[0166] The intersection of the first direction Y and the second direction Z means that the first direction Y and the second direction Z can form an angle greater than 0° and less than 180°, that is, the first direction Y and the second direction Z are not parallel. The first direction Y and the second direction Z can be perpendicular to each other or not perpendicular. The first direction Y and the second direction Z can be intersecting directions on the same plane, or they can be directions on skew planes, and the projection of the second direction Z onto the plane containing the first direction Y can intersect the first direction Y. As an example, the first direction Y and the second direction Z are perpendicular. As an example, the first direction Y is the width direction of battery cell 1, and the second direction Z is the height direction of battery cell 1.

[0167] The battery device 10 provided in this application embodiment is insulated on a first wall 1221 of the housing 12 along the first direction Y by a first portion M of the electrode terminal 13, and insulated on a second wall 1222 of the housing 12 along the second direction Z by a second portion N of the electrode terminal 13. The second portion N is used for electrical connection with the information acquisition component 5. The battery cell row V includes a plurality of battery cells 1 arranged along the first direction Y, and the first portions M of the electrode terminals 13 of two adjacent battery cells 1 along the first direction Y are electrically connected, so that the electrode terminals 13 of two adjacent battery cells 1 along the first direction Y are electrically connected through the first portion M, rather than by welding the second portion N to the busbar component. In this way, when designing the electrode terminal 13, it is not necessary to consider the required penetration depth when welding the second portion N to the busbar component, that is, the second portion N does not need to have a large size along the second direction Z, so that the size of the second portion N in the second direction Z can be reduced, thereby reducing the size of the electrode terminal 13 protruding from the second wall 1222 along the second direction Z. When the dimension of the electrode assembly 11 along the second direction Z is predetermined, it helps to reduce the dimension of the battery cell 1 in the second direction Z; when the dimension of the battery cell 1 along the second direction Z is predetermined, it helps to increase the dimension of the electrode assembly 11 along the second direction Z. Therefore, it helps to improve the energy density of the battery cell 1 and also helps to improve the utilization rate of the internal space of the battery device 10 in the second direction Z, thereby improving the energy density of the battery device 10.

[0168] In some embodiments, please refer to the following: Figures 5 to 12 In the battery cell row V, the first part M of two adjacent battery cells 1 along the first direction Y is welded.

[0169] Understandably, in the battery cell array V, the electrode terminals 13 of two adjacent battery cells 1 along the first direction Y are respectively the positive electrode terminal and the negative electrode terminal, and the first part M of the positive electrode terminal and the first part M of the negative electrode terminal are arranged and welded along the first direction Y.

[0170] In some possible designs, within the battery cell array V, the second portions N of two adjacent battery cells 1 along the first direction Y can also be welded. Understandably, within the battery cell array V, the connection regions of the first portions M and second portions N of two adjacent battery cells 1 along the first direction Y are welded. That is, within the battery cell array V, the electrode terminals 13 of two adjacent battery cells 1 along the first direction Y are respectively a positive electrode terminal and a negative electrode terminal, and the connection regions of the first portions M and second portions N of the positive electrode terminal and the connection regions of the first portions M and second portions N of the negative electrode terminal are welded.

[0171] This configuration makes the electrical connection between the first part M of two adjacent battery cells 1 along the first direction Y in the battery cell row V simple and efficient.

[0172] In the battery cell array V, the first portions M of two adjacent battery cells 1 are welded along the first direction Y, allowing for stitch welding between the first portions M of the electrode terminals 13 of the two adjacent battery cells 1 along the first direction Y. Thus, the design of the first portions M needs to consider the required penetration depth during welding, and the penetration direction of the first portions M is primarily considered in the second direction Z, not the first direction Y, requiring the first portions M to have a larger dimension along the second direction Z. Based on this, the dimension of the first portions M in the first direction Y can be reduced, and the dimension of the first portions M protruding beyond the first wall 1221 along the first direction Y can also be reduced. Therefore, by designing the first portions M, it is helpful to reduce the dimension of the battery cell 1 in the first direction Y when the dimension of the electrode assembly 11 along the first direction Y is predetermined; and to increase the dimension of the electrode assembly 11 along the first direction Y when the dimension of the battery cell 11 along the first direction Y is predetermined. Therefore, this helps to improve the energy density of the battery cells 1 and also helps to improve the utilization rate of the internal space of the battery device 10 in the first direction Y, thereby increasing the energy density of the battery device 10.

[0173] Furthermore, in the battery cell array V, the electrode terminals 13 of two adjacent battery cells 1 are welded together, without the need for welding through the busbar 3, thus saving the use of the busbar 3 in the battery device 10. Therefore, it helps to improve the energy density of the battery device 10.

[0174] In some embodiments, please refer to the following: Figures 9 to 12 The outer casing 12 is provided with a mounting hole 101, which is disposed on at least one of the first wall 1221 and the second wall 1222. At least one of the first part M and the second part N is mounted in the mounting hole 101.

[0175] The mounting hole 101 can be provided on the first wall 1221 and the second wall 1222. The first part M is installed in the portion of the mounting hole 101 on the first wall 1221, and the second part N is installed in the portion of the mounting hole 101 on the second wall 1222. Figures 9 to 12 As shown. Alternatively, the mounting hole 101 is provided on the first wall 1221, but not on the second wall 1222, with the first portion M mounted in the mounting hole 101 and the second portion N provided on the side of the second wall 1222 away from the electrode assembly 11 along the second direction Z. Alternatively, the mounting hole 101 is provided on the second wall 1222, but not on the first wall 1221, with the first portion M provided on the side of the first wall 1221 away from the electrode assembly 11 along the first direction Y, and the second portion N mounted in the mounting hole 101.

[0176] Understandably, electrode terminal 13 is electrically connected to electrode assembly 11 through mounting hole 101. When mounting hole 101 is provided on the first wall 1221 and the second wall 1222, at least one of the first portion M and the second portion N can be electrically connected to electrode assembly 11; or, when mounting hole 101 is provided on the first wall 1221 but not on the second wall 1222, the first portion M is electrically connected to electrode assembly 11; or, when mounting hole 101 is provided on the second wall 1222 but not on the first wall 1221, the second portion N is electrically connected to electrode assembly 11.

[0177] By adopting the above technical solution, the electrode terminal 13 can be set on the housing 12 in a very flexible manner, and the electrical connection between the electrode terminal 13 and the electrode assembly 11 can also be set in a very flexible manner.

[0178] It should be further explained that the mounting hole 101 is provided on the first wall 1221. When the first part M is installed in the mounting hole 101, at least a portion of the first part M can be inserted into the mounting hole 101 along the first direction Y. This helps to reduce the size of the first part M protruding out of the first wall 1221 along the first direction Y. Thus, when the size of the electrode assembly 11 along the first direction Y is predetermined, it helps to reduce the size of the battery cell 1 in the first direction Y. When the size of the battery cell 1 along the first direction Y is predetermined, it helps to increase the size of the electrode assembly 11 along the first direction Y.

[0179] Mounting hole 101 is provided on second wall 1222. When second part N is mounted in mounting hole 101, at least part of second part N can be inserted into mounting hole 101 along second direction Z. This helps to reduce the size of second part N protruding from second wall 1222 along second direction Z. Thus, when the size of electrode assembly 11 along second direction Z is predetermined, it helps to reduce the size of battery cell 1 in second direction Z. When the size of battery cell 1 along second direction Z is predetermined, it helps to increase the size of electrode assembly 11 along second direction Z.

[0180] This configuration helps to improve the energy density of the battery cell 1 and also helps to improve the utilization rate of the internal space of the battery device 10 in the second direction Z, thereby increasing the energy density of the battery device 10.

[0181] Please refer to the following in some possible designs. Figures 9 to 12 The mounting hole 101 includes a first hole segment 1011 and a second hole segment 1012 that are interconnected. The first hole segment 1011 is disposed on the first wall 1221, and the second hole segment 1012 is disposed on the second wall 1222. The first part M is installed on the first hole segment 1011, and the second part N is installed on the second hole segment 1012.

[0182] Understandably, mounting holes 101 are provided on the first wall 1221 and the second wall 1222. The portion of mounting hole 101 on the first wall 1221 is the first hole segment 1011, and the portion of mounting hole 101 on the second part N is the second hole segment 1012. The first hole segment 1011 is provided to penetrate the first wall 1221 along the first direction Y, and the second hole segment 1012 is provided to penetrate the second wall 1222 along the second direction Z.

[0183] The first part M can be electrically connected to the electrode assembly 11 through the first hole segment 1011, and the second part N can also be electrically connected to the electrode assembly 11 through the second hole segment 1012.

[0184] Alternatively, in some other possible designs, the mounting hole 101 includes a first hole segment 1011 disposed on the first wall 1221, but does not include a second hole segment 1012, with the first portion M mounted on the first hole segment 1011.

[0185] Understandably, the mounting hole 101 is provided to penetrate the first wall 1221 along the first direction Y. The first portion M can be electrically connected to the electrode assembly 11 through the first hole segment 1011.

[0186] Alternatively, in some other possible designs, mounting hole 101 includes a second hole segment 1012 disposed on the second wall 1222, but does not include the first hole segment 1011, with the second part N mounted on the second hole segment 1012.

[0187] Understandably, the mounting hole 101 is provided to penetrate the second wall 1222 along the second direction Z. The second portion N can be electrically connected to the electrode assembly 11 through the second hole segment 1012.

[0188] It should be further explained that when the mounting hole 101 includes the first hole segment 1011, the first part M is installed in the first hole segment 1011. At least a portion of the first part M can be inserted into the first hole segment 1011 along the first direction Y, which helps to reduce the size of the first part M protruding out of the first wall 1221 along the first direction Y.

[0189] When the mounting hole 101 includes the second hole segment 1012, the second part N is mounted in the second hole segment 1012. At least a portion of the second part N can be inserted into the second hole segment 1012 along the second direction Z, which helps to reduce the size of the second part N protruding out of the second wall 1222 along the second direction Z.

[0190] By adopting the above technical solution, the mounting hole 101 can be set very flexibly, which makes the arrangement of the electrode terminal 13 on the housing 12 very flexible.

[0191] In some embodiments, please refer to the following: Figures 9 to 12 The electrode terminal 13 includes a terminal body 131 and a limiting portion 132 disposed on the terminal body 131, the limiting portion 132 surrounding the terminal body 131. The terminal body 131 is bent, and both the first part M and the second part N include portions of the terminal body 131, and both the first part M and the second part N include portions of the limiting portion 132. The limiting portion 132 located in the first part M is disposed on the first wall 1221, and the limiting portion 132 located in the second part N is disposed on the second wall 1222. The terminal body 131 of at least one of the first part M and the second part N is mounted in the mounting hole 101, and the terminal body 131 of at least one of the first part M and the second part N is electrically connected to the electrode assembly 11. In the battery cell array V, along the first direction Y, the terminal bodies 131 of the first part M of two adjacent battery cells 1 are electrically connected.

[0192] The terminal body 131 is the main part of the electrode terminal 13, serving as the current transmission end of the electrode terminal 13 for transmitting current. The limiting part 132 is the part of the electrode terminal 13 used for limiting. The limiting part 132 and the terminal body 131 can be integrally provided or separately fixed.

[0193] Understandably, the terminal body 131 is bent so that it is divided into two relatively bent parts, which respectively constitute the first part M and the second part N. That is, both the first part M and the second part N include a portion of the terminal body 131 and a portion of the limiting part 132, and the terminal body 131 of the first part M is bent relative to the terminal body 131 of the second part N.

[0194] When the mounting hole 101 includes a first hole segment 1011, the terminal body 131 of the first part M is mounted in the first hole segment 1011. When the mounting hole 101 includes a second hole segment 1012, the terminal body 131 of the second part N is mounted in the second hole segment 1012.

[0195] Understandably, the terminal body 131 is electrically connected to the electrode assembly 11. Specifically, the first portion M is electrically connected to the electrode assembly 11, meaning that the terminal body 131 of the first portion M is electrically connected to the electrode assembly 11. Similarly, the second portion N is electrically connected to the electrode assembly 11, meaning that the terminal body 131 of the second portion N is electrically connected to the electrode assembly 11.

[0196] As an example, in a battery cell row V, in two adjacent battery cells 1 along the first direction Y, the connection area of ​​the terminal body 131 of the first part M and the terminal body 131 of the second part N of one battery cell 1, and the connection area of ​​the terminal body 131 of the first part M and the terminal body 131 of the second part N of the other battery cell 1 are welded together.

[0197] In some embodiments, please refer to the following: Figures 9 to 12 The battery cell 1 also includes a first insulating member 14, a portion of which is disposed between the first wall 1221 and the limiting portion 132 located in the first part M, and another portion of which is disposed between the second wall 1222 and the limiting portion 132 located in the second part N.

[0198] The first insulating component 14 refers to a component with insulating properties.

[0199] This arrangement allows the first insulating element 14 to be positioned between the housing 12 and the electrode terminal 13, thereby achieving insulation between the electrode terminal 13 and the housing 12.

[0200] Specifically, the limiting portion 132 located in the first part M is disposed on the side of the first wall 1221 away from the electrode assembly 11 along the first direction Y, and the limiting portion 132 located in the second part N is disposed on the side of the second wall 1222 away from the electrode assembly 11 along the second direction Z. One part of the first insulating member 14 is disposed between the first wall 1221 and the limiting portion 132 located in the first part M along the first direction Y, and the other part of the first insulating member 14 is disposed between the second wall 1222 and the limiting portion 132 located in the second part N along the second direction Z.

[0201] In some embodiments, the first insulating element 14 includes at least one of a sealant and an insulating adhesive.

[0202] A seal is a component that has sealing and insulating properties, such as a silicone ring or a rubber ring.

[0203] Insulating adhesive refers to a colloidal structure with insulating properties, such as a structural adhesive layer.

[0204] This configuration enables insulation between the housing 12 and the electrode terminals 13.

[0205] In some embodiments, please refer to the following: Figures 9 to 12 The battery cell 1 also includes a second insulating member 15, which is fixedly connected to at least one of the first wall 1221 and the second wall 1222, and at least a portion of the second insulating member 15 is located on the side of the limiting portion 132 away from the first insulating member 14.

[0206] The second insulating element 15 is a component with insulating properties, which may be, but is not limited to, a plastic structure.

[0207] Understandably, at least a portion of the second insulating member 15 may be disposed on the side of the limiting portion 132 of the first portion M away from the electrode assembly 11 along the first direction Y, or it may be disposed on the side of the limiting portion 132 of the second portion N away from the electrode assembly 11 along the second direction Z.

[0208] This configuration allows the electrode terminal 13 to be fixed to the housing 12 via the second insulating member 15, thus achieving insulation between the electrode terminal 13 and the housing 12.

[0209] In some embodiments, please refer to the following: Figures 9 to 12 The second insulating member 15 is disposed around the electrode terminal 13. The second insulating member 15 has a first groove 102 on the side near the electrode assembly 11. The limiting part 132 is limited within the first groove 102, and the limiting part 132 is limited between the side of the first insulating member 14 away from the electrode assembly 11 and the bottom wall of the first groove 102.

[0210] Understandably, the limiting portion 132 is disposed around the terminal body 131, and the second insulating member 15 is disposed around the terminal body 131, and the second insulating member 15 is disposed around the limiting portion 132. The limiting portion 132 is limited within the first groove 102, that is, at least a portion of the limiting portion 132 is located within the first groove 102, so that the limiting portion 132 can be limited by the groove sidewall of the first groove 102.

[0211] Understandably, the second insulating member 15 is bent, and the first groove 102 can be divided into two interconnected parts. One part of the first groove 102 is located on the side of the second insulating member 15 along the first direction Y, close to the electrode assembly 11, and the other part of the first groove 102 is located on the side of the second insulating member 15 along the second direction Z, close to the electrode assembly 11. In the first direction Y, the limiting portion 132 of the first part M is located between the bottom wall of the first groove 102 along the first direction Y and the side of the first insulating member 14 away from the electrode assembly 11. In the second direction Z, the limiting portion 132 of the second part N is located between the bottom wall of the first groove 102 along the second direction Z and the side of the first insulating member 14 away from the electrode assembly 11.

[0212] This configuration achieves the limiting of the electrode terminal 13 relative to the outer shell 12 and the second insulating member 15. On the one hand, it allows the electrode terminal 13 to be securely fixed on the second insulating member 15, and on the other hand, it allows the electrode terminal 13 to be securely fixed on the outer shell 12 through the second insulating member 15.

[0213] Furthermore, by limiting the first groove 102 with the limiting part 132, the first portion M is inserted into the second insulating member 15 along the first direction Y. This helps to reduce the size of the battery cell 1 along the first direction Y, given that the size of the electrode assembly 11 along the first direction Y is predetermined. Similarly, the second portion N is inserted into the second insulating member 15 along the second direction Z. This also helps to reduce the size of the battery cell 1 along the second direction Z, given that the size of the electrode assembly 11 along the second direction Z is predetermined. Therefore, this helps to increase the energy density of the battery cell 1 and also improves the utilization rate of the internal space of the battery device 10, thereby increasing the energy density of the battery device 10.

[0214] In some embodiments, please refer to the following: Figures 9 to 12 The outer casing 12 has a second groove 103 extending to the mounting hole 101 on the side away from the electrode assembly 11. The second insulating member 15 is limited to the second groove 103, and the first insulating member 14 is limited to the bottom wall of the second groove 103 and the limiting part 132.

[0215] In some possible designs, the first wall 1221 has a second groove 103 on the side away from the electrode assembly 11 along the first direction Y, and the second wall 1222 has a second groove 103 on the side away from the electrode assembly 11 along the second direction Z. The second groove 103 surrounds the mounting hole 101 and extends to the mounting hole 101. Specifically, the second groove 103 of the first wall 1221 extends to the first hole segment 1011 and surrounds the first hole segment 1011; the second groove 103 of the second wall 1222 extends to the second hole segment 1012 and surrounds the second hole segment 1012. In the first direction Y, a portion of the first insulating member 14 is located between the bottom wall of the second groove 103 of the first wall 1221 and the limiting portion 132 of the first part M. Specifically, in the first direction Y, a portion of the first insulating member 14 is disposed on the bottom wall of the second groove 103 of the first wall 1221, and in the first direction Y, the limiting portion 132 of the first part M is located between the first insulating member 14 and the bottom wall of the first groove 102. In the second direction Z, another portion of the first insulating member 14 is located between the bottom wall of the second groove 103 of the second wall 1222 and the limiting portion 132 of the second part N. Specifically, in the second direction Z, another portion of the first insulating member 14 is disposed on the bottom wall of the second groove 103 of the second wall 1222, and in the second direction Z, the limiting portion 132 of the second part N is located between the first insulating member 14 and the bottom wall of the first groove 102.

[0216] Alternatively, in some other possible designs, the first wall 1221 has a second groove 103 on the side away from the electrode assembly 11 along the first direction Y, while the second wall 1222 does not have a second groove 103. In the first direction Y, a portion of the first insulating member 14 is confined between the bottom wall of the second groove 103 of the first wall 1221 and the limiting portion 132 of the first portion M.

[0217] Alternatively, in some other possible designs, the second wall 1222 has a second groove 103 on the side away from the electrode assembly 11 along the second direction Z, while the first wall 1221 does not have a second groove 103. In the second direction Z, another portion of the first insulating member 14 is confined between the bottom wall of the second groove 103 of the second wall 1222 and the limiting portion 132 of the second portion N.

[0218] This configuration allows the second insulating member 15 to be inserted into the second groove 103 along the first direction Y when the second groove 103 is provided on the side of the first wall 1221 away from the electrode assembly 11. This helps to reduce the size of the first portion M protruding from the first wall 1221 along the first direction Y, and helps to reduce the size of the battery cell 1 in the first direction Y when the size of the electrode assembly 11 in the first direction Y is predetermined; and helps to increase the size of the electrode assembly 11 in the first direction Y when the size of the battery cell 1 in the first direction Y is predetermined. Therefore, it helps to improve the energy density of the battery cell 1 and also helps to improve the utilization rate of the internal space of the battery device 10 in the first direction Y, thereby improving the energy density of the battery device 10.

[0219] When the second groove 103 is provided on the side of the second wall 1222 away from the electrode assembly 11, the second insulating member 15 is inserted into the second groove 103 along the second direction Z. This helps to reduce the size of the second portion N protruding from the second wall 1222 along the second direction Z. This also helps to reduce the size of the battery cell 1 in the second direction Z when the size of the electrode assembly 11 along the second direction Z is predetermined; conversely, it helps to increase the size of the electrode assembly 11 along the second direction Z when the size of the battery cell 1 in the second direction Z is predetermined. Therefore, this helps to improve the energy density of the battery cell 1 and also helps to improve the utilization rate of the internal space of the battery device 10 in the second direction Z, thereby increasing the energy density of the battery device 10.

[0220] In some embodiments, please refer to the following: Figures 9 to 12 The second groove 103 is provided around the mounting hole 101, and the second insulating member 15 is provided around the electrode terminal 13, and the second insulating member 15 is limited by the groove side wall of the second groove 103.

[0221] Understandably, the first wall 1221 is provided with a second groove 103 on the side away from the electrode assembly 11 along the first direction Y, and the second wall 1222 is provided with a second groove 103 on the side away from the electrode assembly 11 along the second direction Z. The second groove 103 is provided around the mounting hole 101 and extends to the mounting hole 101.

[0222] This configuration serves two purposes. First, it allows the outer peripheral wall of the second insulating member 15 to be limited by the inner peripheral wall of the second groove 103, thereby facilitating the fixation of the second insulating member 15 onto the outer casing 12. Second, it reduces the size of the first portion M protruding out of the first wall 1221 along the first direction Y, and the size of the second portion N protruding out of the second wall 1222 along the second direction Z, thereby helping to improve the energy density of the battery cell 1 and increasing the utilization rate of the internal space of the battery device 10, thus improving the energy density of the battery device 10.

[0223] In some embodiments, please refer to the following: Figures 7 to 12 The outer casing 12 includes a housing 121 and an end cap 122, and the electrode assembly 11 is disposed within the space formed by the housing 121 and the end cap 122.

[0224] The housing 121 and the end cap 122 are components that together define the internal environment of the battery cell 1. The internal environment defined by the housing 121 and the end cap 122 is used to house the electrode assembly 11 and the electrolyte.

[0225] In some implementations, the housing 121 and the end cap 122 can be independent components. Specifically, the housing 121 has an opening, and the end cap 122 is placed over the opening of the housing 121 to jointly define the internal environment of the battery cell 1 and isolate the internal environment of the battery cell 1 from the external environment. In other implementations, the housing 121 and the end cap 122 can also be an integrated structure. Specifically, the end cap 122 and the housing 121 can form a common connection surface before the electrode assembly 11 is inserted into the housing. After the electrode assembly 11 is inserted into the housing, when it is necessary to encapsulate the electrode assembly 11, the end cap 122 is then placed over the housing 121.

[0226] Specifically, the end cap 122 is generally disposed on the end side of the housing 121 along the second direction Z.

[0227] Among them, such as Figures 7 to 12 As shown, there can be one end cap 122, which is located at one end of the housing 121. Alternatively, there can be two end caps 122, which are located at opposite ends of the housing 121.

[0228] The housing 121 can be cylindrical, square, or other shapes, depending on the specific shape and size of the electrode assembly 11. The housing 121 and the end cap 122 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0229] In some embodiments, please refer to the following: Figures 7 to 12 The end cap 122 includes a second wall 1222 and a first wall 1221, with the first wall 1221 bent relative to the second wall 1222. The second wall 1222 is disposed at the end of the housing 121 along the second direction Z, and the first wall 1221 is disposed on the third wall 1211 of the housing 121 along the first direction Y.

[0230] The third wall 1211 is a solid wall on the end side of the shell 121 along the first direction Y.

[0231] Specifically, the electrode assembly 11 is disposed within the space formed by the housing 121, the first wall 1221, and the second wall 1222.

[0232] This arrangement allows the electrode terminal 13 to be mounted on the end cover 122. Specifically, the first part M and the second part N of the electrode terminal 13 are both mounted on the end cover 122. This allows the electrode terminal 13 to be installed on the end cover 122 first, and then the end cover 122 to be closed onto the housing 121, which facilitates the assembly of the battery cell 1.

[0233] In some embodiments, the third wall 1211 and the first wall 1221 are the same solid wall, that is, the housing 121 includes the first wall 1221 and the end cap 122 includes the second wall 1222.

[0234] In some embodiments, please refer to the following: Figures 7 to 12 The housing 121 has a notch 104 at one end facing the second wall 1222 along the second direction Z. At least a portion of the notch 104 is provided on the third wall 1211, and the first wall 1221 is mounted on the notch 104.

[0235] Understandably, the notch 104 extends through one end of the housing 121 toward the second wall 1222 along the second direction Z.

[0236] In some possible designs, the notch 104 is provided on the third wall 1211. Alternatively, in other possible designs, the housing 121 includes two fourth walls 1212 disposed opposite each other along a third direction X, the two fourth walls 1212 and the third wall 1211 surrounding to form the notch 104.

[0237] By mounting the first wall 1221 within the notch 104, at least a portion of the first wall 1221 can be inserted into the third wall 1211 along the first direction Y. This helps to reduce the size of the first wall 1221 protruding from the third wall 1211 along the first direction Y away from the electrode assembly 11. Therefore, given a predetermined size of the electrode assembly 11 along the first direction Y, this helps to reduce the size of the battery cell 1 in the first direction Y; conversely, given a predetermined size of the battery cell 1 along the first direction Y, this helps to increase the size of the electrode assembly 11 along the first direction Y. This arrangement helps to reduce the energy density of the battery cell 1 and also helps to improve the utilization rate of the internal space of the battery device 10 in the first direction Y, thereby increasing the energy density of the battery device 10.

[0238] In some embodiments, please refer to the following: Figures 9 to 12 The thickness of the first wall 1221 is greater than the thickness of the third wall 1211, and the first wall 1221 extends inward beyond the third wall 1211 along the first direction Y.

[0239] Wherein, the wall thickness of the first wall 1221 is the dimension of the first wall 1221 along the first direction Y, and the wall thickness of the third wall 1211 is the dimension of the third wall 1211 along the first direction Y.

[0240] Understandably, in the first direction Y, the first wall 1221 extends beyond the third wall 1211 in a direction closer to the electrode assembly 11.

[0241] This configuration helps to reduce the size of the first wall 1221 protruding beyond the third wall 1211 along the first direction Y away from the electrode assembly 11. Therefore, given a predetermined size of the electrode assembly 11 along the first direction Y, this helps to reduce the size of the battery cell 1 in the first direction Y; conversely, given a predetermined size of the battery cell 1 along the first direction Y, this helps to increase the size of the electrode assembly 11 along the first direction Y. This configuration helps to reduce the energy density of the battery cell 1 and also helps to improve the utilization rate of the internal space of the battery device 10 in the first direction Y, thereby increasing the energy density of the battery device 10.

[0242] In some embodiments, please refer to the following: Figures 9 to 12 The electrode assembly 11 includes a main body portion 111 and a tab 112. The main body portion 111 has a third groove 105 on its end side along the first direction Y, and a portion of the first wall 1221 is located within the third groove 105. The tab 112 is disposed on the main body portion 111 and is electrically connected to at least one of the first portion M and the second portion N.

[0243] The tab 112 and the main body 111 can be integrally formed, that is, the tab 112 is formed by die-cutting in the electrode sheet. Alternatively, the tab 112 and the main body 111 can be separate parts, for example, the tab 112 and the main body 111 can be welded together.

[0244] At least one of the first part M and the second part N is electrically connected to the electrode assembly 11, specifically, at least one of the first part M and the second part N is electrically connected to the tab 112.

[0245] Understandably, the main body portion 111 is recessed at its end along the first direction Y to form a third groove 105.

[0246] Understandably, in the first direction Y, the first wall 1221 protrudes from the third wall 1211 toward the direction of the electrode assembly 11 so as to be inserted into the third groove 105.

[0247] With this configuration, the first wall 1221 extends inward beyond the third wall 1211 along the first direction Y, and at least part of the first wall 1221 is avoided within the third groove 105. This eliminates the need to reduce the overall size of the electrode assembly 11 along the first direction Y, thereby helping to improve the energy density of the battery cell 1.

[0248] In some embodiments, please refer to the following: Figures 9 to 12In the second direction Z, the third groove 105 penetrates the end side of the main body 111 near the second wall 1222.

[0249] This arrangement helps the first wall 1221 to avoid being contained within the third groove 105.

[0250] In some embodiments, please refer to the following: Figures 9 to 12 At least a portion of the tab 112 is located within the third groove 105.

[0251] By having at least a portion of the tab 112 disposed within the third groove 105, the tab 112 can reasonably occupy the internal space of the battery cell 1 without the tab 112 extending excessively out of the main body portion 111 along the first direction Y or the second portion N. This helps to reduce the size of the battery cell 1 along the first direction Y and the second direction Z when the size of the main body portion 111 is predetermined, thereby helping to improve the energy density of the battery cell 1.

[0252] In some embodiments, the main body 111 includes a positive electrode and a negative electrode, both of which are connected to tabs 112. The positive and negative electrode are alternately stacked along a third direction X. The third direction X intersects the first direction Y, and the third direction X intersects the second direction Z.

[0253] Understandably, the positive electrode is electrically connected to the positive electrode tab, and the negative electrode is electrically connected to the negative electrode tab.

[0254] The main body 111 is formed by alternating layers of positive and negative electrode sheets, which facilitates the formation of a third groove 105 on the end side of the main body 111 along the first direction Y, and also facilitates the arrangement of at least a portion of the tab 112 within the third groove 105.

[0255] In some embodiments, please refer to the following: Figures 6 to 12 The electrode terminal 13 includes a positive electrode terminal and a negative electrode terminal. In the battery cell 1, the first portion M of the positive electrode terminal and the first portion M of the negative electrode terminal are respectively disposed on two first walls 1221 of the housing 12 along the first direction Y. The second portion N of the positive electrode terminal and the second portion N of the negative electrode terminal are disposed at intervals on the same second wall 1222 of the housing 12 along the second direction Z.

[0256] Understandably, the outer casing 12 has a second wall 1222 at one end along the second direction Z, and first walls 1221 at both opposite ends along the first direction Y. That is, the outer casing 12 includes two first walls 1221 and one second wall 1222. The first portion M of the positive electrode terminal is disposed on one of the first walls 1221, the first portion M of the negative electrode terminal is disposed on the other first wall 1221, and the second portions N of the positive electrode terminal and the second portions N of the negative electrode terminal are disposed alternately on the second wall 1222.

[0257] This configuration allows the first portion M of the positive electrode terminal and the first portion M of the negative electrode terminal to be located at opposite ends of the outer casing 12 along the first direction Y. This facilitates the welding of the electrode terminals 13 of any two battery cells 1 in the battery cell array V, thereby achieving electrical connection of multiple battery cells 1 in the battery cell array V. Furthermore, the second portion N of the positive electrode terminal and the second portion N of the negative electrode terminal are located at the same end of the outer casing 12 along the second direction Z. This facilitates the acquisition and monitoring of data such as voltage, current, and temperature of the multiple battery cells 1 in the battery cell array V.

[0258] Specifically, please refer to the following: Figures 7 to 12 The end cap 122 includes a second wall 1222 and two first walls 1221, which are disposed at both ends of the second wall 1222 along the first direction Y. The housing 121 includes two third walls 1211 disposed opposite each other along the first direction Y, with the two first walls 1221 respectively disposed on the two third walls 1211. The first portion M of the positive electrode terminal is disposed on one of the first walls 1221, and the first portion M of the negative electrode terminal is disposed on the other first wall 1221. The second portions N of the positive electrode terminal and the second portions N of the negative electrode terminal are disposed alternately on the second wall 1222.

[0259] The main body 111 has a third groove 105 at both ends along the first direction Y. The positive electrode tab is electrically connected to the positive electrode terminal, and at least a portion of the positive electrode tab is located in one of the third grooves 105. The negative electrode tab is electrically connected to the negative electrode terminal, and at least a portion of the negative electrode tab is located in the other third groove 105.

[0260] It should be noted that the intersection of the third direction X with the first direction Y, and the intersection of the third direction X with the second direction Z, are analogous to the intersection of the first direction Y and the second direction Z, and will not be repeated here. As an example, the first direction Y is perpendicular to the second direction Z, the first direction Y is perpendicular to the third direction X, and the second direction Z is perpendicular to the third direction X. As an example, the first direction Y is the width direction of battery cell 1, the second direction Z is the height direction of battery cell 1, and the third direction X is the thickness direction of battery cell 1.

[0261] In some embodiments, please refer to the following: Figures 5 to 7 The battery cell assembly U includes multiple battery cells arranged in a third direction X, which intersects with the first direction Y and the second direction Z.

[0262] The battery device 10 also includes a busbar 3, the first part M of two adjacent battery cell rows V is electrically connected through the busbar 3, and at least a part of the busbar 3 and the battery cell 1 are arranged along the first direction Y.

[0263] The busbar component 3 refers to a component with conductive properties. The busbar component 3 is electrically connected to two adjacent battery cell rows V to electrically connect multiple battery cell rows V of the battery cell assembly U.

[0264] By arranging at least a portion of the busbar 3 and the battery cell 1 along the first direction Y, such that the busbar 3 is located at the end of the battery cell array V along the first direction Y, the size of the battery cell 1 along the second direction Z can be reduced when the size of the electrode assembly 11 is predetermined, thereby helping to improve the energy density of the battery cell 1 and thus improve the energy density of the battery device 10.

[0265] In some embodiments, please refer to the following: Figure 4 and Figure 5 The battery device 10 also includes a housing 2, which comprises a main body 21 and a cover 22. In the second direction Z, the cover 22 is disposed at one end of the main body 21 near the second wall 1222. The battery cell assembly U is disposed within the space formed by the main body 21 and the cover 22. The battery device 10 also includes a first adhesive layer 4, which is bonded between the cover 22 and the second wall 1222 of the outer casing 12 near the cover 22 to fix the cover 22 and the battery cell assembly U. The first adhesive layer 4 avoids the presence of an information acquisition component 5.

[0266] The first adhesive layer 4 refers to a structural layer composed of adhesive, which has adhesive properties. The adhesive used in the first adhesive layer 4 can be, but is not limited to, a structural adhesive.

[0267] The first adhesive layer 4 is disposed on the first wall 1221. The first adhesive layer 4 is bonded to the first wall 1221 and the cover 22 on opposite sides along the second direction Z, so as to fix the battery cell assembly U and the cover 22.

[0268] The first adhesive layer 4 is set to avoid the information collection component 5, which means that the first adhesive layer 4 can be divided into multiple layers, and multiple first adhesive layers 4 are set on the second wall 1222 to avoid the information collection component 5.

[0269] This configuration fixes the battery cell assembly U to the cover 22, allowing the cover 22 to constrain the battery cell assembly U and resist its expansion. This eliminates the need for steel strips, pressure bars, and other components, thus helping to improve the energy density of the battery device 10.

[0270] In some embodiments, in the second direction Z, a second adhesive layer is bonded between the wall of the outer shell 12 away from the cover 22 and the box body 21.

[0271] The second adhesive layer refers to the structural layer composed of glue, which has adhesive properties.

[0272] Understandably, the housing 12 includes a second wall 1222. A second adhesive layer is disposed on the wall of the housing 12 away from the second wall 1222 along the second direction Z, and the second adhesive layer is bonded to the opposite sides of the housing body 21 and the housing 12 along the second direction Z, respectively, so as to bond the battery cell assembly U to the housing body 21.

[0273] This configuration allows the battery cell assembly U to be bonded to the main body 21 via the second adhesive layer and to the cover 22 via the first adhesive layer 4. The cover 22 is fixed to the main body 21, thereby fixing the main body 21, the battery cell assembly U, and the cover 22 into a whole. This allows the main body 21 and the cover 22 to jointly constrain the battery cell assembly U to resist its expansion.

[0274] In some embodiments, in the second direction Z, a thermal management structure is provided on the wall of the housing body 21 away from the cover 22. The thermal management structure is used to achieve thermal management of the battery cell 1 through a thermal management medium such as a coolant.

[0275] The adhesive for the second layer can be a thermally conductive adhesive, which can improve the thermal conductivity between the battery cell module U and the thermal management structure, thereby improving the thermal management effect of the battery cell module U.

[0276] In some embodiments, please refer to the following: Figure 4 and Figure 5 The main body 21 includes two first sidewalls 211 and two second sidewalls 212. The two first sidewalls 211 are arranged opposite each other along a first direction Y, and the two second sidewalls 212 are arranged opposite each other along a third direction X. The battery cell assembly U is located between the two first sidewalls 211 along the first direction Y, and the battery cell assembly U is also located between the two second sidewalls 212 along the third direction X. The third direction X intersects the first direction Y, and the third direction X intersects the second direction Z.

[0277] The first side wall 211 can be the wall of the main body 21, or it can be a beam, side plate, end plate, etc. inside the main body 21. The second side wall 212 can be the wall of the main body 21, or it can be a beam, side plate, end plate, etc. inside the main body 21.

[0278] By setting two first sidewalls 211 and two second sidewalls 212, the battery cell assembly U is confined within the main body 21 along the first direction Y and the third direction X. This helps to further fix the main body 21, the battery cell assembly U and the cover 22 into a whole. Thus, the main body 21 and the cover 22 together constrain the battery cell assembly U to resist the expansion of the battery cell assembly U.

[0279] Please refer to the following: Figures 5 to 12 The battery cell 1 provided in this embodiment includes a housing 12, an electrode assembly 11, and electrode terminals 13. The electrode assembly 11 is disposed within the housing 12. The electrode terminal 13 includes a first portion M and a second portion N bent relative to the first portion M. The first portion M is insulated on a first wall 1221 of the housing 12 along a first direction Y, and the second portion N is insulated on a second wall 1222 of the housing 12 along a second direction Z. The electrode terminal 13 is electrically connected to the electrode assembly 11. Specifically, at least one of the first portion M and the second portion N is electrically connected to the electrode assembly 11. The second portion N is used to be electrically connected to the information acquisition component 5, and the first portion M is used to be electrically connected to the first portion M of the electrode terminal 13 of the battery cell 1 adjacent to the battery cell 1 along the first direction Y. The battery cell 1 in this embodiment is the same as the battery cell 1 in the above embodiments. For details, please refer to the relevant descriptions of the battery cell 1 in the above embodiments, which will not be repeated here.

[0280] The battery cell 1 provided in this embodiment is insulated on a first wall 1221 of the housing 12 along the first direction Y by a first portion M of the electrode terminal 13, and an insulated portion N of the electrode terminal 13 is insulated on a second wall 1222 of the housing 12 along the second direction Z. This allows the electrode terminals 13 of two adjacent battery cells 1 along the first direction Y to be electrically connected through the first portion M, rather than by welding the second portion N to the busbar component. Thus, when designing the electrode terminal 13, it is unnecessary to consider the required weld depth when welding the second portion N to the busbar component; that is, the second portion N does not need to have a large dimension along the second direction Z, allowing its dimension in the second direction Z to be reduced. This also reduces the dimension of the electrode terminal 13 protruding from the second wall 1222 along the second direction Z. When the dimension of the electrode assembly 11 along the second direction Z is predetermined, this helps to reduce the dimension of the battery cell 1 in the second direction Z; conversely, when the dimension of the battery cell 1 along the second direction Z is predetermined, this helps to increase the dimension of the electrode assembly 11 along the second direction Z. Therefore, it helps to improve the energy density of the battery cell 1 and also helps to improve the utilization rate of the internal space of the battery device 10 in the second direction Z, so as to improve the energy density of the battery device 10.

[0281] Please see Figure 3 The electrical device provided in this application embodiment includes a battery cell 1 or a battery device 10. The battery cell 1 and battery device 10 in this embodiment are the same as those in the above embodiments; please refer to the relevant descriptions of the battery cell 1 and battery device 10 in the above embodiments for details, which will not be repeated here.

[0282] The electrical device provided in this application embodiment, by employing the battery cell 1 or battery device 10 mentioned above, helps to improve the energy density of the battery cell 1 or battery device 10, thereby improving the reliability of the electrical device.

[0283] The energy storage device 100 provided in this application embodiment includes a battery device 10 or a battery cell 1, which is used to store or provide electrical energy. The battery device 10 and battery cell 1 in this embodiment are the same as those in the above embodiments; please refer to the relevant descriptions of the battery device 10 and battery cell 1 in the above embodiments for details, which will not be repeated here.

[0284] The energy storage device 100 provided in this application embodiment, by employing the battery cell 1 or battery device 10 mentioned above, helps to improve the energy density of the energy storage device 100.

[0285] Please see Figure 1The energy storage system 1000 provided in this application embodiment includes a power conversion device 1100 and an energy storage device 100. The power conversion device 1100 is connected to the energy storage device 100 to perform power conversion on the current input to the energy storage device 100 or output from the energy storage device 100. The energy storage device 100 in this embodiment is the same as the energy storage device 100 in the above embodiments; please refer to the relevant descriptions of the energy storage device 100 in the above embodiments for details, which will not be repeated here.

[0286] The energy storage system 1000 provided in this application embodiment, by employing the energy storage device 100 involved in the above embodiments, helps to improve the energy density of the energy storage system 1000.

[0287] Please see Figure 2 The charging network 2000 provided in this embodiment includes a charging pile 2100 and an energy storage device 100 or an energy storage system 1000. The energy storage device 100 is used to provide electrical energy to the charging pile 2100. The energy storage device 100 and energy storage system 1000 in this embodiment are the same as those in the above embodiments. Please refer to the relevant descriptions of the energy storage device 100 and energy storage system 1000 in the above embodiments for details, which will not be repeated here.

[0288] The charging network 2000 provided in this application embodiment, by employing the energy storage device 100 or energy storage system 1000 involved in the above embodiments, helps to improve the energy density of the charging network 2000.

[0289] As one embodiment of this application, such as Figures 4 to 12 As shown, the battery device 10 includes a battery cell assembly U and an information acquisition component 5. The battery cell assembly U includes multiple battery cell rows V arranged along a third direction X. The battery cell rows V include multiple battery cells 1 arranged along a first direction Y. Each battery cell 1 includes a housing 12, an electrode assembly 11, and an electrode terminal 13. The electrode assembly 11 is disposed inside the housing 12, and the electrode terminal 13 is electrically connected to the electrode assembly 11. The housing 12 has a first wall 1221 at both opposite ends along the first direction Y, and a second wall 1222 at one end along the second direction Z. The electrode terminal 13 includes a first portion M and a second portion N, with the second portion N bent relative to the first portion M. The first portion M is disposed on the first wall 1221, and the second portion N is disposed on the second wall 1222. The information acquisition component 5 is disposed on the second wall 1222. In the battery cell rows V, the first portions M of the electrode terminals 13 of two adjacent battery cells 1 along the first direction Y are welded together. The first direction Y and the second direction Z are perpendicular.

[0290] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, The system includes a battery cell assembly and an information acquisition assembly. The battery cell assembly includes at least one row of battery cells, and the row of battery cells includes multiple battery cells arranged along a first direction. The battery cells include: shell; Electrode assembly, disposed within the housing; An electrode terminal includes a first portion and a second portion bent relative to the first portion. The first portion is insulated on a first wall of the housing along a first direction, and the second portion is insulated on a second wall of the housing along a second direction. At least one of the first portion and the second portion is electrically connected to the electrode assembly. The information acquisition component is disposed on the second wall and electrically connected to the second part; in the battery cell row, the first parts of two adjacent battery cells along the first direction are electrically connected. The first direction and the second direction intersect.

2. The battery device according to claim 1, characterized in that, In the battery cell array, the first portions of two adjacent battery cells along the first direction are welded together.

3. The battery device according to claim 1, characterized in that, The outer casing is provided with mounting holes, which are disposed on at least one of the first wall and the second wall, and at least one of the first portion and the second portion is mounted in the mounting holes.

4. The battery device according to claim 3, characterized in that, The mounting hole includes a first hole segment disposed on the first wall, and the first part is installed in the first hole segment; And / or, the mounting hole includes a second hole segment disposed on the second wall, and the second portion is mounted in the second hole segment.

5. The battery device according to claim 3, characterized in that, The electrode terminal includes a terminal body and a limiting portion surrounding the terminal body. Both the first part and the second part include a portion of the terminal body and a portion of the limiting portion. The limiting portion located in the first part is disposed on the first wall, and the limiting portion located in the second part is disposed on the second wall. The terminal body located in at least one of the first part and the second part is mounted in the mounting hole, and the terminal body located in at least one of the first part and the second part is electrically connected to the electrode assembly. In the battery cell array, the terminal bodies of the first portions of two adjacent battery cells along the first direction are electrically connected; The battery cell further includes a first insulating member, a portion of which is disposed between the first wall and the limiting portion located in the first portion, and another portion of which is disposed between the second wall and the limiting portion located in the second portion.

6. The battery device according to claim 5, characterized in that, The first insulating element includes at least one of a sealant and an insulating adhesive.

7. The battery device according to claim 5, characterized in that, The battery cell further includes a second insulating member, which is fixedly connected to at least one of the first wall and the second wall, and is at least partially located on the side of the limiting portion away from the first insulating member.

8. The battery device according to claim 7, characterized in that, The second insulating member is disposed around the electrode terminal. The second insulating member has a first groove on the side near the electrode assembly. The limiting part is located within the first groove and is located between the side of the first insulating member away from the electrode assembly and the bottom wall of the first groove.

9. The battery device according to claim 7, characterized in that, The outer casing has a second groove extending to the mounting hole on the side away from the electrode assembly. The second insulating member is located within the second groove, and the first insulating member is located between the bottom wall of the second groove and the limiting portion.

10. The battery device according to claim 9, characterized in that, The second groove is disposed around the mounting hole, the second insulating member is disposed around the electrode terminal, and the second insulating member is limited by the groove sidewall of the second groove.

11. The battery device according to any one of claims 1-10, characterized in that, The housing includes a shell and an end cap. The end cap includes a second wall and a first wall bent relative to the second wall. The second wall is disposed at the end of the shell along the second direction, and the first wall is disposed on a third wall of the shell along the first direction. The electrode assembly is disposed within the space formed by the shell and the end cap.

12. The battery device according to claim 11, characterized in that, The housing has a notch at one end facing the second wall along the second direction, and at least a portion of the notch is provided on the third wall, with the first wall mounted on the notch.

13. The battery device according to claim 12, characterized in that, The thickness of the first wall is greater than the thickness of the third wall, and the first wall extends inward beyond the third wall along the first direction.

14. The battery device according to claim 13, characterized in that, The electrode assembly includes: The main body has a third groove on its end side along the first direction, and a portion of the first wall is located within the third groove; A tab is disposed on the main body portion and electrically connected to at least one of the first portion and the second portion.

15. The battery device according to claim 14, characterized in that, At least a portion of the electrode tab is located within the third groove.

16. The battery device according to claim 14, characterized in that, The main body includes a positive electrode and a negative electrode, both of which are connected to the tabs. The positive and negative electrode are alternately stacked along a third direction, which intersects the first direction and the second direction, respectively.

17. The battery device according to any one of claims 1-10, characterized in that, The electrode terminals include positive electrode terminals and negative electrode terminals. In the battery cell, the first portion of the positive electrode terminal and the first portion of the negative electrode terminal are respectively disposed on two first walls of the outer casing along the first direction, and the second portion of the positive electrode terminal and the second portion of the negative electrode terminal are disposed at intervals on the same second wall of the outer casing along the second direction.

18. The battery device according to any one of claims 1-10, characterized in that, The battery cell assembly includes multiple rows of battery cells arranged along a third direction, which intersects the first direction and the second direction respectively; The battery device further includes a busbar component, through which the first portions of two adjacent rows of battery cells are electrically connected, and at least a portion of the busbar component and the battery cells are arranged along the first direction.

19. The battery device according to any one of claims 1-10, characterized in that, The battery device further includes a housing, which includes a housing body and a cover. In the second direction, the cover is disposed at one end of the housing body near the second wall, and the battery cell assembly is disposed within the space formed by the housing body and the cover. The battery device further includes a first adhesive layer, which is bonded between the cover and the second wall of the outer casing near the cover to fix the cover and the battery cell assembly, and the first adhesive layer is disposed away from the information acquisition component.

20. The battery device according to claim 19, characterized in that, In the second direction, a second adhesive layer is bonded between the outer shell away from the cover and the box body.

21. The battery device according to claim 19, characterized in that, The main body of the box includes two first sidewalls opposite each other along the first direction and two second sidewalls opposite each other along the third direction. The battery cell assembly is located between the two first sidewalls along the first direction and between the two second sidewalls along the third direction. The third direction intersects with the first direction and the second direction, respectively.

22. A single battery cell, characterized in that, include: shell; Electrode assembly, disposed within the housing; An electrode terminal includes a first portion and a second portion bent relative to the first portion. The first portion is insulated on a first wall of the housing along a first direction, and the second portion is insulated on a second wall of the housing along a second direction. At least one of the first portion and the second portion is electrically connected to the electrode assembly. The second part is used to be electrically connected to the information acquisition component, and the first part is used to be electrically connected to the first part of the battery cell adjacent to the first direction. The first direction and the second direction intersect.

23. An electrical appliance, characterized in that, It includes the battery device according to any one of claims 1-21; or, it includes the battery cell according to claim 22.

24. An energy storage device, characterized in that, Includes a battery device according to any one of claims 1-21 or a battery cell according to claim 22, wherein the battery device or the battery cell is used to store or provide electrical energy.

25. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device according to claim 24, wherein the power conversion device is configured to connect to the energy storage device to perform power conversion on current input to or output from the energy storage device.

26. A charging network, characterized in that, It includes a charging pile and an energy storage device according to claim 24 or an energy storage system according to claim 25, wherein the energy storage device is used to provide electrical energy to the charging pile.

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