Single battery, battery module, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a single battery, a battery module, a battery pack and electric equipment, relates to the technical field of batteries, and is used for solving the problem that after the single battery is connected with a bar, the occupied space in the height of the single battery is relatively large. The single battery comprises a shell, a first pole and a second pole, the first pole and the second pole are arranged on the shell; one side of the first pole, which is deviated from the shell, and one side of the second pole, which is deviated from the shell, are provided with a first surface and a second surface; the first surface and the second surface are located on different planes, and the first surface is closer to the housing than the second surface. The first surface is used for connecting bars. The first surface is connected with the sheet, so that the occupied space of the single battery in the height direction of the single battery after the single battery is connected with the sheet is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single cell, a battery module, a battery pack, and an electrical device. Background Technology

[0002] As one of the core components of new energy vehicles, the power battery directly affects the vehicle's performance in terms of range, safety, power, environmental adaptability, and long-term reliability. Reducing the space occupied by the power battery and increasing its energy density are key development trends and challenges for new energy vehicles.

[0003] A power battery typically comprises multiple individual cells, each including terminals. The connection between two individual cells is achieved by connecting the terminals of the two individual cells respectively using busbars. When the terminal is an integrated unit, one end of the terminal is connected to the cell of the individual cell, while the other end is exposed outside the cell's casing. The exposed portion of the terminal, furthest from the casing, is used to connect the busbar. When the terminal includes a connecting block and a connecting terminal, the connecting block is located on the outer surface of the casing. One end of the connecting terminal is connected to the cell of the individual cell, and the other end is inserted into and connected to the connecting block (e.g., riveted). The busbar is typically connected to the connecting block's furthest surface from the casing.

[0004] In both cases, connecting the battery pack to the individual cell increases the overall size of the individual cell in the height direction (i.e., the size of the individual cell connected to the battery pack in the height direction), which in turn leads to a decrease in the space utilization and energy density of the battery. Utility Model Content

[0005] This application provides a single battery cell, a battery module, a battery pack, and an electrical device, with the aim of reducing the space occupied by the single battery cell at the height of the single battery cell after it is connected to the battery pack, thereby improving the space utilization rate of the battery.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a single-cell battery, which includes a housing, a first terminal post, and a second terminal post. The first terminal post and the second terminal post are disposed on the housing. The side of the first terminal post facing away from the housing and the side of the second terminal post facing away from the housing have a first surface and a second surface. The first surface and the second surface are located on different planes, and the first surface is closer to the housing than the second surface. The first surface is used to connect a battery plate.

[0008] In the existing technology, the terminals of a single cell are connected to the electrode plate. After the electrode plate is connected to the terminal, the total height of the single cell will increase.

[0009] To reduce the height dimension of the single-cell battery after the electrode plate is connected to the terminal post, the single-cell battery described in this application has a first surface and a second surface on the side away from the battery casing. The first surface is closer to the casing than the second surface, i.e., the first surface is lower than the second surface. Compared to the prior art, the lower surface (first surface) of the terminal post of the single-cell battery described in this application is used for connection with the electrode plate. Therefore, the total height dimension of the single-cell battery is reduced after the terminal post is connected to the electrode plate. This helps to reduce the space occupied by the single-cell battery in the height direction after the connection with the electrode plate. With the same spatial dimensions, the reduced height at the connection between the electrode plate and the terminal post can be used to increase the height of the cell inside the single-cell battery, thereby increasing the cell capacity and thus improving the energy density of the single-cell battery.

[0010] In one optional embodiment, the side of the first pole facing away from the housing and the side of the second pole facing away from the housing further include: a limiting surface, the limiting surface connecting the first surface and the second surface. The limiting surface is used to abut or connect with the barcode.

[0011] In this example, the first surface, the second surface, and the limiting surface together form a stepped structure. The limiting surface provides auxiliary installation and limiting for the pad. For example, before the pad is connected to the first surface of the first pole, the side of the pad closest to the first pole rests against the limiting surface of the first pole. This facilitates the installation and positioning of the pad during production, makes it easier to build an automated production line, and helps improve production efficiency and reduce production costs.

[0012] In some examples, the limiting surface can be connected to the plate, which allows the limiting surface to have a flow guiding effect, thereby increasing the flow area between the pole and the plate.

[0013] For example, connecting the first electrode to the circuit breaker increases the flow area between the circuit breaker and the first electrode. Connecting the second electrode to the circuit breaker increases the flow area between the circuit breaker and the second electrode.

[0014] In this example, the limiting surface can be either a plane or a curved surface.

[0015] In one alternative embodiment, the first pole and the second pole are disposed on the same side of the housing.

[0016] This avoids the situation where the total dimension of a single cell increases in the height direction due to the first and second terminals being located on different sides of the casing.

[0017] Because the first electrode post is away from the surface of the casing and the second electrode post is away from the surface of the casing, and they are staggered in the height direction of the battery casing, the height dimension of the individual battery cell may be increased.

[0018] In some examples, the surfaces of the first pole and the second pole facing away from the housing are made flush.

[0019] This avoids the situation where the surfaces of the first and second electrodes facing away from the casing are staggered in the height direction of the single cell, which would otherwise lead to an increase in the overall size of the single cell in the height direction.

[0020] In one alternative embodiment, an insulating element is provided around the outer periphery of the first pole post.

[0021] This ensures insulation between the first pole and the casing, guaranteeing insulation safety.

[0022] In the example, the insulating element may include a first insulating portion and a second insulating portion. The first insulating portion is disposed on the surface of the first pole near the housing, and the second insulating portion surrounds the outer peripheral surface of the first pole.

[0023] The first insulating portion separates the surface of the first electrode near the housing from the housing, thus ensuring insulation between the surface of the first electrode near the housing and the housing. The second insulating portion separates the outer peripheral surface of the first electrode from the housing or other structures (such as other individual battery cells), thus ensuring insulation between the outer peripheral surface of the first electrode and the housing or other structures (such as other individual battery cells). Furthermore, the first insulating portion can be connected to the second insulating portion, facilitating the assembly of the insulating component with the first electrode, reducing assembly steps, and also helping to prevent insulation failure between the first electrode and the housing between the first insulating portion and the second insulating portion.

[0024] Similarly, in some examples, the outer periphery of the second pole may be surrounded by an insulating element.

[0025] This ensures insulation between the second pole and the housing, guaranteeing insulation safety.

[0026] In this example, the insulating element surrounding the second pole and the insulating element surrounding the first pole may be the same or different in terms of structure, size, and shape.

[0027] In one alternative implementation, the first pole is a one-piece molded structural component.

[0028] In this example, a portion of the first terminal post is connected to the cell inside the single battery cell, while a portion is disposed on the outer surface of the single battery cell's casing. The portion of the first terminal post located on the outer surface of the casing has a first surface and a second surface. The one-piece molded structure of the first terminal post facilitates installation and processing, reducing machining and assembly steps.

[0029] Similarly, in some examples, the second pole can also be a one-piece molded structural component.

[0030] In this example, a portion of the second terminal post connects to the cell within the single battery cell, while a portion is disposed on the outer surface of the single battery cell's casing. The portion of the second terminal post located on the outer surface of the casing has a first surface and a second surface. The one-piece molded structure of the second terminal post facilitates installation and processing, reducing machining and assembly steps.

[0031] In one optional embodiment, the first pole and the second pole include: a connecting block and a connecting pole, a first surface and a second surface are formed on the connecting block, a first hole is provided on the second surface, the connecting pole is inserted into the first hole, and the connecting pole is connected to the inner wall of the first hole.

[0032] In this example, one end of the connecting post passes through the housing and is inserted into the first hole, connecting to the inner wall of the first hole (e.g., by welding or riveting), while the other end connects to the cell of the individual battery. This allows the current from the cell to be drawn to the connecting block via the connecting post, and then led out through the tab connected to the connecting block.

[0033] The polarity of the first and second poles can be determined by the positive or negative of the connecting poles. For example, if the connecting pole of the first pole is positive, the first pole is positive (i.e., the second pole is negative); if the connecting pole of the first pole is negative, the first pole is negative (i.e., the second pole is positive).

[0034] In one alternative implementation, the first electrode is a copper electrode.

[0035] Copper has good electrical conductivity, so the contact resistance between the electrode and the first electrode can be reduced by using a copper terminal, thereby improving the current carrying capacity and ensuring the current carrying capacity between the electrode and the first electrode, as well as meeting safety performance requirements.

[0036] Similarly, in some examples, the second terminal can also be a copper terminal to reduce the contact resistance between the tap and the second terminal, thereby improving the current-carrying efficiency, ensuring the current-carrying capacity between the tap and the second terminal, and meeting safety performance requirements.

[0037] A second aspect of this application provides a battery module comprising multiple individual cells and multiple battery cells. The multiple battery cells include a first battery cell, at least one second battery cell, and a third battery cell. The multiple individual cells include a first individual cell, at least one second individual cell, and a third individual cell arranged side-by-side, wherein the first, second, and third individual cells are the aforementioned individual cells. The first battery cell is connected to the first individual cell. The first individual cell, at least one second individual cell, and the third individual cell are connected to each other via the second battery cell. The third battery cell is connected to the third individual cell.

[0038] In this example, there can be one second cell, which is connected to the first cell and the second cell via a second plate.

[0039] Alternatively, there can be multiple second individual cells. The first individual cell, multiple second individual cells, and the third individual cell are connected sequentially in a side-by-side direction. Adjacent individual cells are connected via second plates. In this example, adjacent individual cells can be connected by one first plate or multiple first plates to meet different connection requirements.

[0040] In some examples, the first pad can be connected (in series or in parallel) to an external component (such as the electrical connection of the battery module) or other individual cells, and the second pad can be connected (in series or in parallel) to an external component (such as the electrical connection of the battery module) or other individual cells.

[0041] There are several ways to connect the first single cell, at least one second single cell, and the third single cell. In some examples, the first single cell, at least one second single cell, and the third single cell are connected in series in a parallel direction.

[0042] For example, there is one second cell. The first terminal of the first cell is connected to the first electrode plate, and the second terminal of the first cell is connected to the second terminal of the second cell via a second electrode plate. The first terminal of the second cell is connected to the first terminal of the third cell via another second electrode plate. The second terminal of the third cell is connected to the third electrode plate.

[0043] In this configuration, the first terminal of the first single-cell battery can be the positive terminal (i.e., the second terminal of the first single-cell battery is the negative terminal). To achieve series connection between the first, second, and third single-cell batteries, the first terminal of the second single-cell battery is the negative terminal (i.e., the second terminal of the second single-cell battery is the positive terminal). The first terminal of the third single-cell battery is the positive terminal (i.e., the second terminal is the negative terminal).

[0044] Alternatively, the first terminal of the first single cell can also be the negative terminal (i.e., the second terminal of the first single cell is the positive terminal). To achieve series connection between the first, second, and third single cells, the first terminal of the second single cell is the positive terminal (i.e., the second terminal of the second single cell is the negative terminal). The first terminal of the third single cell is the negative terminal (i.e., the second terminal is the positive terminal).

[0045] In other examples, a portion of the first single cell, at least one second single cell, and a third single cell are connected in parallel, or the first single cell, at least one single cell, and the third single cell are connected in parallel.

[0046] For example, a second single-cell battery is configured as one. The first, second, and third single-cell batteries are connected in parallel. The first terminal of the first single-cell battery is connected to a first electrode plate, and the second terminal of the third single-cell battery is connected to a third electrode plate. The second electrode plate includes a second electrode plate a and a second electrode plate b. The second terminals of the first and second single-cell batteries are connected via second electrode plate a. The first terminal of the second single-cell battery is connected to the first terminal of the third single-cell battery via second electrode plate b.

[0047] In this configuration, the first terminal of each of the first, second, and third individual cells is either a positive terminal or a negative terminal. To achieve parallel connection between the first, second, and third individual cells, the first electrode plate (b) is connected to the second electrode plate (b), and the third electrode plate is connected to the second electrode plate (a).

[0048] Because the space occupied by the individual battery cells is reduced in the height direction, it can be used to reduce the space and weight of the battery module while maintaining the same battery module capacity, thereby improving the space utilization and gravimetric energy density of the battery module. While maintaining the same space occupied by the battery module, it can be used to increase the cell capacity within the battery module, thereby increasing the energy density of the battery module and improving its range.

[0049] In addition, the battery module provided in this application includes the aforementioned single cell. Therefore, the battery module provided in this application and the aforementioned single cell can solve the same technical problems and have the same technical effects, which will not be elaborated here.

[0050] In one alternative embodiment, the surface of the first pad facing away from the first single cell is flush with the second surface of the first single cell.

[0051] This can be understood as the connection between the first terminal and the first contact plate of the first single-cell battery not changing the overall dimension of the first single-cell battery in the height direction. Compared to the arrangement where the surface of the first contact plate protrudes from the second surface of the first single-cell battery away from the casing, this not only reduces the overall dimension of the first single-cell battery in the height direction after the terminal and the first contact plate are connected, but also helps to reduce the space occupied by the first single-cell battery in the height direction after the connection between the first contact plate and the first contact plate. With the same spatial dimension, the reduced height at the connection between the first contact plate and the terminal of the first single-cell battery can be used to increase the height of the cell inside the first single-cell battery, thereby increasing the cell capacity of the first single-cell battery and thus improving the energy density of the first single-cell battery.

[0052] Similarly, in some examples, the surface of the second pad facing away from the individual cell (e.g., the first, second, or third individual cell) is flush with the second side of the individual cell. For instance, having the surface of the second pad facing away from the second individual cell flush with the second side of the second individual cell can reduce the space occupied by the second individual cell in the height direction after it is connected to the second pad. Within the same spatial dimensions, this can also be used to increase the cell capacity of the second individual cell, thereby improving its energy density.

[0053] In some examples, the surface of the third electrode pad facing away from the third cell is flush with the second surface of the third cell. This reduces the space occupied by the third cell in the height direction after the third cell is connected to the third electrode pad. Within the same spatial dimensions, this can also increase the cell capacity of the third cell, thereby improving its energy density.

[0054] In one alternative implementation, the first bar is a copper bar.

[0055] Copper has good electrical conductivity, so the contact resistance between the first electrode and the terminal of the first cell can be reduced by using copper electrodes, thereby improving the overcurrent efficiency and ensuring the overcurrent capacity between the first electrode and the terminal of the first cell, as well as meeting safety performance requirements.

[0056] Similarly, in some examples, the second and third bar pieces can also be copper bar pieces.

[0057] In one alternative embodiment, a second hole is provided on the first pad, and the second surface of the first single cell is accommodated in the second hole.

[0058] For example, the first electrode pad is connected to the first terminal of the first single cell. During installation, the second side of the first terminal of the first single cell is first inserted and accommodated in the second hole, and then the first electrode pad and the first side of the first terminal of the first single cell are connected.

[0059] In this example, the second side of the first terminal of the first single cell can be completely or partially accommodated within the second hole.

[0060] Similarly, in some examples, a second hole can also be provided on the second and third bar pieces.

[0061] To connect the two individual cells, the second electrode plate can have two second holes. For example, the second terminals of the first and second individual cells are connected via the second electrode plate, with the second surface of the first cell's second terminal housed in one second hole and the second surface of the second cell's second terminal housed in the other second hole.

[0062] A third aspect of this application provides a battery pack comprising a first battery module and a second battery module, wherein the first or second battery module is the aforementioned battery module; the battery pack includes a first electrical connection terminal and a second electrical connection terminal, the first electrical connection terminal being connected to a first tab of the first battery module, and a third tab of the first battery module being connected to a first tab of the second battery module. The second electrical connection terminal is connected to a third tab of the second battery module.

[0063] In this example, the first battery module and the second battery module can be connected in series or in parallel to meet different connection requirements.

[0064] After the first battery module and the second battery module are connected, they are connected to the first and second electrical connection terminals of the battery pack to realize the internal electrical connection of the battery pack.

[0065] The reduced space occupied by the aforementioned battery module allows for a smaller battery pack size and weight, improving space utilization and gravimetric energy density while maintaining the same battery pack capacity. Conversely, the smaller space occupied by the battery pack allows for an increase in cell capacity, thereby increasing energy density and range. Furthermore, the battery pack provided in this application includes the aforementioned battery module; therefore, the battery pack provided in this application solves the same technical problems and achieves the same technical effects as the aforementioned battery module, and will not be elaborated further here.

[0066] A fourth aspect of this application provides an electrical appliance that includes an appliance housing and the aforementioned battery pack, the battery pack being located within the appliance housing.

[0067] The aforementioned battery pack is located within the device housing, which can reduce the space occupied by the battery pack within the device housing and the weight of the electrical device. Alternatively, it can be used to provide more electrical energy to the electrical device, thereby improving the device's own battery life. Furthermore, the electrical device provided in this application includes the aforementioned battery pack; therefore, the electrical device provided in this application and the aforementioned battery pack can solve the same technical problem and have the same technical effects, which will not be elaborated further here. Attached Figure Description

[0068] Figure 1 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application;

[0069] Figure 2 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0070] Figure 3 A three-dimensional structural diagram of the battery module provided in the first embodiment of this application;

[0071] Figure 4 A three-dimensional structural diagram of a single battery cell provided in the first embodiment of this application;

[0072] Figure 5 for Figure 4 A partial structural diagram showing the connection between a single cell and a solar panel;

[0073] Figure 6 A partial structural diagram of a single-cell battery in which the electrode post and the electrode plate are connected, provided for the first embodiment of this application;

[0074] Figure 7 A three-dimensional structural diagram of a single-cell battery in which the terminal post and the insulating component are connected, provided for the first embodiment of this application;

[0075] Figure 8 for Figure 7 Exploded view;

[0076] Figure 9 A three-dimensional structural diagram of the battery module provided in the second embodiment of this application;

[0077] Figure 10 A three-dimensional structural diagram of a single battery cell provided for the second embodiment of this application;

[0078] Figure 11 for Figure 10 A partial structural diagram showing the connection between a single cell and a solar panel;

[0079] Figure 12 A partial structural diagram of a single-cell battery in which the electrode post and the electrode plate are connected, provided for the second embodiment of this application;

[0080] Figure 13 A three-dimensional structural diagram of the electrode post in a single cell provided for the second embodiment of this application.

[0081] Figure label:

[0082] 10 - Single cell; 1 - First single cell; 2 - First single cell; 3 - Second single cell;

[0083] 11-Shell; 12-First pole; 13-Second pole;

[0084] 01-First side; 02-Second side; 03-Limiting side;

[0085] 14-Connecting block; 141-First hole; 15-Connecting pole; 16-Insulating component; 161-First insulating part; 1611-Allowing hole; 162-Second insulating part;

[0086] 20 - First tablet; 30 - Second tablet; 40 - Third tablet; 04 - Second orifice;

[0087] 100 - Battery module; 1011 - Positive electrical connection terminal; 1012 - Negative electrical connection terminal; 103 - First battery module; 104 - Second battery module;

[0088] 200 - Battery pack; 201 - Battery casing; 202 - First electrical connection terminal; 203 - Second electrical connection terminal;

[0089] 300 - Electrical equipment; 301 - Equipment enclosure. Detailed Implementation

[0090] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0091] In this application, unless otherwise expressly specified and limited, the terms "upper", "lower", "front", "back", "left", "right", etc., indicating orientation or positional relationship may be defined relative to the orientation of the components schematically placed in the accompanying drawings. These directional terms may be relative concepts, used for relative description and clarification, and may change accordingly depending on the orientation of the components in the accompanying drawings. They should not be construed as limitations on this application.

[0092] In this application, the terms "first," "second," etc., are used for descriptive purposes only to distinguish one element from another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0093] In this application, unless otherwise expressly stated and limited, "multiple" means two or more.

[0094] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines or channels, the terms "connection" and "linkage" as used in this application have the meaning of establishing electrical conductivity. The specific meaning needs to be understood in conjunction with the context.

[0095] Furthermore, in this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0096] In the accompanying drawings of the embodiments of this application, solid structures such as parts and components are represented by guide lines; hollow structures such as openings, holes, spaces, and cavities are represented by guide lines with arrows.

[0097] This application provides an embodiment of an electrical device, which can be a mobile device, such as an electric vehicle, airplane, ship, or drone, or an energy storage device, such as an energy storage battery cabinet or a mobile power supply. This application does not impose any special limitations on the specific form of the aforementioned electrical device.

[0098] Figure 1 An exemplary structural diagram of an electrical device 300, which is an electric vehicle, is provided. (Refer to...) Figure 1 The example electrical device 300 includes a device housing 301 and a battery pack 200. The device housing 301 is the vehicle floor, and the battery pack 200 is located inside the device housing 301.

[0099] In some examples, the device housing 301 can also be configured as an engine compartment or a trunk, etc. This application embodiment does not impose special restrictions on the specific form of the device housing 301.

[0100] In other embodiments, the electrical device 300 may not include a device housing, and the battery pack 200 may be installed in other devices, such as at the bottom of the vehicle body. This application does not specifically limit the installation location of the battery pack 200.

[0101] Figure 2 An exemplary structural schematic diagram of a battery pack 200 used in the aforementioned electrical device 300 is provided. (Refer to...) Figure 2 The example battery pack 200 includes a battery housing 201 and the aforementioned battery module 100. The battery module 100 is installed inside the battery housing 201.

[0102] Reference Figure 2 The battery pack 200 includes a first electrical connection terminal 202 and a second electrical connection terminal 203. The battery module 100 is connected between the first electrical connection terminal 202 and the second electrical connection terminal 203.

[0103] In some examples, there can be multiple battery modules 100, which can be connected in series, in parallel, or both. The connection and arrangement methods between the battery modules within the battery pack 200 are well known to those skilled in the art and will not be described in detail here.

[0104] For example, refer to Figure 2 The battery module 100 includes a first battery module 1003 and a second battery module 1004.

[0105] The first battery module 1003 and the second battery module 1004 are connected in series. The first battery module 1003 is connected to the first electrical connection terminal 202 of the battery pack 200, and the second battery module 1004 is connected to the second electrical connection terminal 203 of the battery pack 200.

[0106] In other examples, there may be only one battery module 100. Therefore, this embodiment does not specifically limit the number of battery modules 100 within the battery pack 200, the specific connection method of the battery modules 100, or their arrangement.

[0107] Figure 3 An exemplary three-dimensional structural diagram of a battery module 100 used in the aforementioned battery pack 200 is provided. (Refer to...) Figure 3 The example battery module 100 includes a positive electrode connection terminal 1011, a negative electrode connection terminal 1012, and multiple individual cells 10, each of which includes a first individual cell 1, a second individual cell 2, and a third individual cell 3. The first individual cell 1, the second individual cell 2, and the third individual cell 3 are arranged side by side and connected in series. The second individual cell 2 is disposed between the first individual cell 1 and the third individual cell 3.

[0108] Reference Figure 3 The first single cell 1 is connected to the negative electrode terminal 1012 via a first tab 20, and the third single cell 3 is connected to the positive electrode terminal 1011 via a third tab 40. The first single cell 1 and the second single cell 2 are connected in series via a second tab 30, and the second single cell 2 and the third single cell 3 are connected in series via another second tab 30.

[0109] In other embodiments, the first single cell 1 can be connected to the positive terminal 1011, and the third single cell 3 can be connected to the negative terminal 1012.

[0110] In some examples, the first cell 1, the second cell 2, and the third cell 3 can also be connected in parallel, or in series and parallel. Those skilled in the art can design selectively according to actual needs.

[0111] Reference Figure 3 The first single cell 1, the second single cell 2 and the third single cell 3 each include a housing 11, a first terminal 12 and a second terminal 13, and the first terminal 12 and the second terminal 13 are disposed on the housing 11.

[0112] Reference Figure 3 The first terminal 12 of the first single cell 1 is connected to the first electrode plate 20, and the second terminal 13 of the first single cell 1 is connected to the second terminal 13 of the second single cell 2 through the second electrode plate 30; the first terminal 12 of the second single cell 2 is connected to the first terminal 12 of the third single cell 3 through another second electrode plate 30, and the second terminal 13 of the third single cell 3 is connected to the third electrode plate 40.

[0113] In this example, the first terminal 12 of the first single cell 1 is the negative terminal, and the second terminal 13 is the positive terminal. Correspondingly, the first terminal 12 of the second single cell 2 is the positive terminal, and the second terminal 13 is the negative terminal. The first terminal 12 of the third single cell 3 is the negative terminal, and the second terminal 13 is the positive terminal.

[0114] In some examples, the first terminals 12 of the first single-cell battery 1, the second single-cell battery 2, and the third single-cell battery 3 are arranged sequentially in a side-by-side direction, and the second terminals 13 of the first single-cell battery 1, the second single-cell battery 2, and the third single-cell battery 3 are arranged sequentially in a side-by-side direction. Adjacent first terminals 12 are arranged opposite each other in the side-by-side direction. Adjacent second terminals 13 are arranged opposite each other in the side-by-side direction.

[0115] This facilitates the connection between terminals and reduces the length, space, and weight of the connecting plate, thereby helping to reduce the space occupied, cost, and weight of the battery module 100.

[0116] In addition, reducing the length of the electrode plate used to connect the two terminals can also reduce the risk of insulation failure between the electrode plate and the individual battery cell 10, ensuring the safety and reliability of the battery module 100.

[0117] In some examples, the first terminal 12 and the second terminal 13 of the first single cell 1, the second single cell 2, and the third single cell 3 are disposed on the same side to reduce the height dimension of the battery module 100, thereby reducing the space occupied by the battery module 100. This avoids the situation where the total height dimension of the single cell increases due to the first and second terminals being disposed on different sides of the casing.

[0118] Furthermore, the first electrode plate 20, the second electrode plate 30, and the third electrode plate 40 can each be selected from any suitable shape, structure, or material according to actual needs. For example, the first electrode plate 20, the second electrode plate 30, and the third electrode plate 40 can all be copper electrodes. Copper has good conductivity, therefore, using copper electrodes can reduce the contact resistance between the electrode plate and the terminal, thereby improving the current carrying capacity and ensuring that the current carrying capacity between the electrode plate and the terminal meets safety performance requirements.

[0119] Furthermore, the structure and size of the first plaster 20, the second plaster 30, and the third plaster 40 may be the same or different. This application does not impose specific limitations on these aspects.

[0120] Figure 4 An exemplary structural schematic diagram of a single cell 10 used in the aforementioned battery module 100 is provided. (Refer to...) Figure 4 In the example single cell 10, the first terminal 12 and the second terminal 13 are disposed on the housing 11.

[0121] In this example, the first terminal 12 and the second terminal 13 are located on the same side of the housing 11, which reduces the size of the individual battery cell 10 in its height direction.

[0122] In other examples, the first terminal 12 and the second terminal 13 may be located on different sides of the housing 11, for example, the first terminal 12 and the second terminal 13 may be located on opposite sides of the housing 11 in the height direction of the single cell 10.

[0123] Figure 5 An exemplary partial structural diagram of a single cell and a battery in a connected state is provided. (Refer to...) Figure 5 The second terminal 13 of the single cell 10 is connected to the second plate 30. The first terminal 12 and the second terminal 13 both include a connecting block 14 and a connecting terminal 15. The connecting block 14 is provided with a first hole 141. The connecting terminal 15 is inserted into the first hole 141 and is connected to the inner wall of the first hole 141.

[0124] In this example, one end of the connecting post 15 is inserted into the first hole 141 and connected to the inner wall of the first hole 141, while the other end passes through the housing 12 and connects to the battery cell inside the housing 12. The connecting post 15 connects the battery cell and the connecting block 14 together, so that the current from the battery cell can be led to the connecting block 14 through the connecting post 15. The connecting post 15 and the inner wall of the first hole 141 can be connected in any suitable manner, such as by welding or riveting. This embodiment of the application does not specifically limit the connection method between the connecting post 15 and the first hole 141.

[0125] In some examples, the end of the connecting post 15 is located in the first hole 141.

[0126] This can be understood as the end of the connecting post 15 not protruding from the second surface 02, so as to reduce the size of the single cell 10 in its height direction.

[0127] In some examples, the number and type of cells in a single battery cell 10 can be selected according to actual needs. For example, a single battery cell 1 can be provided with one cell or multiple cells. The cells can be cylindrical cells, square cells or pouch cells.

[0128] Reference Figure 5 The connecting block 14 has a first surface 01 and a second surface 02 on the side opposite to the housing 11. The first surface 01 is closer to the housing 11 than the second surface 02. The bar is connected to the first surface 01, and the first hole 141 is provided on the second surface 02.

[0129] In this example, a height difference is formed between the first surface 01 and the second surface 02, and the first surface 01 is positioned closer to the housing 12 than the second surface 02. This can be understood as the first surface 01 being the lower surface and the second surface 02 being the higher surface in the height direction of the single battery cell 10.

[0130] The connecting pole 15 is inserted into the first hole 141 of the second surface 02 and connected to the inner wall of the first hole 141 (e.g., by welding or riveting) to achieve the connection between the connecting block 14 and the connecting pole 15. The first plate 20 is connected to the first surface 01 (e.g., by welding). In this way, the connection between the first plate 20 and the connecting pole 15 can be achieved through the connecting block 14.

[0131] The second electrode post 13 of the single cell 10 is connected to the second electrode plate 30 on its lower surface (first surface 01). Therefore, after the second electrode post 13 of the single cell 10 is connected to the first electrode plate 20, the overall size of the single cell 10 in the height direction is reduced. This helps to reduce the space occupied by the single cell 10 in the height direction after it is connected to the electrode plate.

[0132] Within the same spatial dimensions, the reduced height at the connection between the first plate 20 and the terminal post can be used to increase the height of the cell within the single battery cell 10, thereby increasing the cell capacity of the single battery cell 10 and thus improving the energy density of the single battery cell 10.

[0133] For example, the height of the single battery cell 10 is 98mm, and the distance between the surface of the connecting block 14 facing away from the housing 11 and the housing 11 of the single battery cell 11 is 2.5mm-3mm. By setting the first surface 01 and the second surface 02, the height of the single battery cell 10 after being connected to the battery pack can be reduced by 0.5mm-2mm, and the volumetric energy density of the battery can be increased by 1%-2%, which is beneficial to improving the battery capacity and battery range.

[0134] In addition, by setting the first surface 01 and the second surface 02, the weight of the single battery 10, the battery module 100 having the single battery 10 and the battery pack 200 can be reduced. For example, the weight of the single battery can be reduced by 3.5g to 5g, and the weight of the single battery can be reduced by 1.5% to 3%, which is beneficial to improving the weight energy density of the battery.

[0135] The first terminal 12 of the single cell 10 is also connected to the electrode plate. The connection method between the first terminal 12 and the electrode plate is the same as the connection method between the second terminal 13 and the first electrode plate 20, and will not be described again here.

[0136] To minimize the height dimension of the individual cell 10 after connection with the solar panel, in some examples, refer to... Figure 5 The first terminal 12 and the second terminal 13 of the single cell 10 are located on the same side of the housing 11, and the first surface 01 of each connecting block 14 is closer to the housing 11 than the second surface 02.

[0137] The connection between each pole and the plate is achieved by connecting the plate to the first surface 01 of the connecting block 14.

[0138] In this example, the surfaces of the first terminal 12 and the second terminal 13 facing away from the housing 11 are flush, that is, the second surfaces 02 of the two connecting blocks 14 are flush, so as to avoid the situation where the surfaces of the first terminal 12 facing away from the housing 11 and the surfaces of the second terminal 13 facing away from the housing 11 are misaligned in the height direction of the single cell 10, resulting in an increase in the total size of the single cell 10 in the height direction.

[0139] In this example, both the first terminal 12 and the second terminal 13 can be copper terminals. Using copper terminals can reduce the contact resistance between the circuit breaker and the terminal, thereby improving the current carrying efficiency and ensuring the current carrying capacity between the circuit breaker and the terminal, as well as meeting safety performance requirements.

[0140] Figure 6 A partial structural diagram illustrating the connection between the pole and the electrode is shown as an example. (Refer to...) Figure 5 and Figure 6 The second pole post 13 is connected to the second plate 30. The surface of the second plate 30 facing away from the housing 11 is flush with the second surface 02 of the second pole post 13.

[0141] This can be understood as the dimension in the height direction of the second pole post 13 after it is connected to the second bar 30 being the same as the dimension in the height direction of the second pole post 12. In other words, the dimension in the height direction of the second pole post 13 after it is connected to the second bar 30 remains unchanged, thereby reducing the space occupied in the height direction of the second pole post 13 after it is connected to the second bar 3.

[0142] In some examples, the length of the connection portion between the second plaster 30 and the first surface 01 can be increased, that is, the length of the second plaster 30 in... Figure 6 The dimensions in the horizontal direction on the middle plane are to ensure the flow area between the second plate 30 and the second pole 13.

[0143] In this example, the length and thickness of the connection between the second bar plate 30 and the first surface 01 can be designed based on actual simulation and heat transfer calculation results, and this application does not impose specific limitations on this.

[0144] The connection methods of the first pad 20 and the third pad 40 to the pole are the same as those of the second pad 30 to the pole, and will not be repeated here.

[0145] Figure 7 An exemplary schematic diagram shows a structure in which the pole and the insulator are connected. (Refer to...) Figure 6 and Figure 7 The side of the second pole post 13 away from the housing 11 (i.e. the side of the connecting block 14 away from the housing 11) also has a limiting surface 03. The limiting surface 03 connects the first surface 01 and the second surface 02. The side of the first bar plate 20 near the second surface 02 abuts against the limiting surface 03.

[0146] In this example, the first surface 01, the second surface 02, and the limiting surface 03 together form a stepped structure. The limiting surface 03 provides auxiliary installation and limiting for the second plate 30, which is beneficial for the installation and positioning of the first plate 20 during production, facilitates the construction of automated production lines, and helps improve production efficiency and reduce production costs.

[0147] In some examples, the second bar 30 can be connected to the side of the second surface 02, such as by welding it to the limiting surface 03, so that the limiting surface 03 has a flow guiding function and ensures the flow area between the second bar 30 and the second pole post 13.

[0148] The connection method between the second electrode plate 30 and the third electrode plate 40 and the terminal post is the same as the connection method between the first electrode plate 20 and the single cell 10, and will not be described again here.

[0149] To further improve the current-carrying capacity between the battery and the electrode, both the first electrode 12 and the second electrode 13 can be made of copper. The copper electrode can reduce the contact resistance between the battery and the electrode, thereby improving the current-carrying efficiency and ensuring the current-carrying capacity between the battery and the electrode as well as meeting safety performance requirements.

[0150] Reference Figure 7 An insulating element 16 is provided around the outer periphery of the second pole post 13.

[0151] In this example, the insulating element 16 surrounds the outer periphery of the connecting block 14, which can ensure the insulation between the second terminal 13 and other structures (such as the casing of a single battery cell) to ensure insulation safety.

[0152] Figure 8 for Figure 7 Exploded view. (Refer to...) Figure 8 The insulating component 16 includes a first insulating portion 161 and a second insulating portion 162.

[0153] Reference Figure 8 The first insulating part 161 is located at the bottom of the second pole post 13, that is, the bottom of the connecting block 14. It can be understood that the first insulating part 161 is located on the side of the connecting block 14 away from the first surface 01 and the second surface 02, and the first insulating part 161 is provided with a clearance hole 1611 for the connecting pole post 15 to pass through.

[0154] Reference Figure 8 The second insulating portion 162 surrounds the outer periphery of the second pole post 13, i.e., the outer periphery of the connecting block 14. The first insulating portion 161 ensures insulation of the bottom side of the connecting block 14, and the second insulating portion 162 ensures insulation of the periphery of the connecting block 14. The connection between the first insulating portion 161 and the second insulating portion 162 facilitates the assembly of the insulating component 16 and the second pole post 13, reduces assembly steps, and also helps to prevent insulation failure of the second pole post 13 between the first insulating portion 161 and the second insulating portion 162.

[0155] In this example, the shape of the second insulating portion 162 is adapted to the outer periphery of the second pole post 13, and the shape of the first insulating portion 161 is adapted to the shape of the connecting block 14 near the housing 11, so as to further ensure the insulation safety between the connecting blocks 14.

[0156] In some examples, the connecting block 14 is a single molded part to facilitate manufacturing.

[0157] The first pole post 12 and the second pole post 13 have the same structure, and the outer periphery of the first pole post 12 is also provided with an insulating component, which will not be described in detail here.

[0158] Figure 9 An exemplary perspective view of another battery module 100 used in the aforementioned battery pack 200 is provided. (Refer to...) Figure 9 The example battery module 100 includes a positive electrode connection terminal 1011, a negative electrode connection terminal 1012, and multiple individual cells 10, each of which includes a first individual cell 1, a second individual cell 2, and a third individual cell 3. The first individual cell 1, the second individual cell 2, and the third individual cell 3 are arranged side by side and connected in series. The second individual cell 2 is disposed between the first individual cell 1 and the third individual cell 3.

[0159] Reference Figure 9 The first single cell 1 is connected to the negative electrode terminal 1012 via a first tab 20, and the third single cell 3 is connected to the positive electrode terminal 1011 via a third tab 40. The first single cell 1 and the second single cell 2 are connected in series via a second tab 30, and the second single cell 2 and the third single cell 3 are connected in series via another second tab 30.

[0160] In other embodiments, the first single cell 1 can be connected to the positive terminal 1011, and the third single cell 3 can be connected to the negative terminal 1012.

[0161] In some examples, the first cell 1, the second cell 2, and the third cell 3 can also be connected in parallel, or in series and parallel. Those skilled in the art can design selectively according to actual needs.

[0162] Furthermore, the first electrode plate 20, the second electrode plate 30, and the third electrode plate 40 can each be selected from any suitable shape, structure, or material according to actual needs. For example, the first electrode plate 20, the second electrode plate 30, and the third electrode plate 40 can all be copper electrodes. Copper has good conductivity, therefore, using copper electrodes can reduce the contact resistance between the electrode plate and the terminal, thereby improving the current carrying capacity and ensuring that the current carrying capacity between the electrode plate and the terminal meets safety performance requirements.

[0163] Furthermore, the structure and size of the first plaster 20, the second plaster 30, and the third plaster 40 may be the same or different. This application does not impose specific limitations on these aspects.

[0164] Figure 10 An example application is given in Figure 9 A schematic diagram of the structure of a single battery cell 10 in the battery module 100. (Refer to...) Figure 10 In the example of a single battery cell 10, a first terminal 12 and a second terminal 13 are disposed on a housing 11.

[0165] In this example, the first terminal 12 and the second terminal 13 are located on the same side of the housing 11, which reduces the size of the individual battery cell 10 in its height direction.

[0166] In other examples, the first terminal 12 and the second terminal 13 may be located on different sides of the housing 11, for example, the first terminal 12 and the second terminal 13 may be located on opposite sides of the housing 11 in the height direction of the single cell 10.

[0167] Figure 11 An exemplary partial structural diagram of a single cell and a battery in a connected state is provided. (Refer to...) Figure 11The second terminal 13 of the single cell 10 is connected to the second electrode plate 30. In this example, both the first terminal 12 and the second terminal 13 are integrally formed structural components. A portion of the second terminal 13 is connected to the cell of the single cell 10, and a portion is disposed on the outer surface of the casing 11 of the single cell 10. A first surface 01 and a second surface 02 are formed on the portion located on the outer surface of the casing 11 to facilitate the connection of the second terminal 13 and the second electrode plate 30.

[0168] In some examples, the number and type of cells in a single battery cell 10 can be selected according to actual needs. For example, a single battery cell 10 can have one cell or multiple cells. The cells can be cylindrical cells, square cells, or pouch cells.

[0169] Reference Figure 11 The second pole post 13 has a first surface 01 and a second surface 02 on the side opposite to the housing 11. The first surface 01 is closer to the housing 11 than the second surface 02. The second plate 30 is connected to the first surface 01.

[0170] The second electrode post 13 of the single cell 10 is connected to the second electrode plate 30 on its lower surface (first surface 01). Therefore, after the second electrode post 13 of the single cell 10 is connected to the second electrode plate 30, the overall size of the single cell 10 in the height direction is reduced. Similarly, after the second electrode post 13 of the single cell 10 is connected to the second electrode plate 30, the overall size of the single cell 10 in the height direction is reduced. This helps to reduce the space occupied by the single cell 10 in the height direction after it is connected to the electrode plate.

[0171] Within the same spatial dimensions, the reduced height of the connection between the second plate 30 and the terminal post can be used to increase the height of the cell inside the single cell 10, thereby increasing the cell capacity of the single cell 10 and thus improving the energy density of the single cell 10.

[0172] Reference Figure 11 The second plate 20 is provided with a second hole 04, and the second surface 02 is accommodated in the second hole 04.

[0173] In this example, during installation, the second side 02 of the second pole post 13 is first inserted and accommodated in the second hole 04, and then the second bar plate 30 and the first side 01 are connected.

[0174] Furthermore, the second surface 01 can be completely contained within the second hole 04, or it can be partially contained within the second hole 04. The shape and position of the second hole 04 can be selectively designed based on the shape and position of the second surface 02, and this embodiment does not specifically limit this.

[0175] In some examples, the two ends of the second bar plate 30 are connected to an electrode post, so the second bar plate 30 can be provided with two second holes 04.

[0176] Since both the first terminal 12 and the second terminal 13 of the single cell 10 need to be connected to the electrode, in order to minimize the height dimension of the single cell 10 after connection to the electrode, in some examples, refer to Figure 11 The first terminal 12 and the second terminal 13 of the single cell 10 are located on the same side of the housing 11, and the first surface 01 of each connecting block 14 is closer to the housing 11 than the second surface 02.

[0177] The connection between each pole and the plate is achieved by connecting the plate to the first surface 01 of the connecting block 14.

[0178] In this example, the surfaces of the first terminal 12 and the second terminal 13 facing away from the housing 11 are flush, that is, the second surfaces 02 of the two connecting blocks 14 are flush, so as to avoid the situation where the surfaces of the first terminal 12 facing away from the housing 11 and the surfaces of the second terminal 13 facing away from the housing 11 are misaligned in the height direction of the single cell 10, resulting in an increase in the total size of the single cell 10 in the height direction.

[0179] The connection methods of the first pad 20, the third pad 30 and the pole post are the same as those of the second pad 30 and the pole post, and will not be repeated here.

[0180] Figure 12 An exemplary schematic diagram of a partial structure in which the pole and the electrode are connected is shown. (Refer to...) Figure 11 and Figure 12 The second pole post 13 is connected to the second plate 30, and the surface of the second plate 30 facing away from the housing 11 is flush with the second surface 02.

[0181] This can be understood as the dimension in the height direction of the second pole post 13 after it is connected to the second bar 30 being the same as the dimension in the height direction of the second pole post 13. In other words, the dimension in the height direction of the second pole post 13 after it is connected to the second bar 30 remains unchanged, thereby reducing the space occupied by the second pole post 13 in the height direction after it is connected to the second bar 30.

[0182] In this example, the size of the connection portion between the second electrode plate 30 and the first surface 01 can be increased. For instance, if the connection portion between the second electrode plate 30 and the first surface 01 is circular, the outer diameter of this connection portion can be increased to ensure sufficient flow area between the second electrode plate 30 and the second pole post 13. The outer diameter and thickness of the second electrode plate 30 can be designed based on actual simulation and heat transfer calculation results; this application does not impose specific limitations on these aspects.

[0183] In this example, both the first terminal 12 and the second terminal 13 can be copper terminals. Using copper terminals can reduce the contact resistance between the circuit breaker and the terminal, thereby improving the current carrying efficiency and ensuring the current carrying capacity between the circuit breaker and the terminal, as well as meeting safety performance requirements.

[0184] Figure 13 An exemplary structural schematic diagram of the second pole post 13 is shown. (Refer to...) Figure 11 and Figure 13 The side of the second pole post 13 away from the housing 11 also has a limiting surface 03, which connects the first surface 01 and the second surface 02. The side of the second bar plate 30 near the second surface 02 abuts against the limiting surface 03.

[0185] In this example, the first surface 01, the second surface 02, and the limiting surface 03 together form a stepped structure. The limiting surface 03 provides auxiliary installation limiting for the second plate 30, which is beneficial for the installation and positioning of the second plate 30 during production, facilitates the construction of automated production lines, and helps improve production efficiency and reduce production costs.

[0186] In some examples, the second bar 30 can be connected to the side of the second surface 02, such as by welding it to the limiting surface 03, so that the limiting surface 03 has a flow guiding function and ensures the flow area between the second bar 30 and the first pole post 12.

[0187] Reference Figure 11 and Figure 13 The limiting surface 03 has an arc-shaped cross-section, and the second hole 04 of the second plate 30 is a circular hole, that is, the side of the second plate 30 facing the second surface 02 also has an arc-shaped cross-section.

[0188] The connection method between the first pad 20, the third pad 40 and the single cell 10 is the same as the connection method between the second pad 30 and the single cell 10, and will not be described again here.

[0189] In some examples, an insulating element may also be provided around the outer periphery of the first terminal 12 and the second terminal 13 to ensure insulation between the first terminal 12 and the second terminal 13 and other structures (such as the casing of a single battery cell), thereby ensuring insulation safety. The insulating element may be selectively designed according to the shape of the first terminal 12 and the second terminal 13, and this application does not impose specific limitations on it.

[0190] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A single cell, characterized by, The battery module comprises: a shell; a first pole and a second pole arranged on the shell; a side of the first pole and a side of the second pole away from the shell have a first surface and a second surface, the first surface and the second surface are located in different planes, and the first surface is closer to the shell than the second surface; the first surface is used to connect the tab.

2. The cell according to claim 1, wherein The side of the first pole and the side of the second pole away from the shell also have a limiting surface connecting the first surface and the second surface; the limiting surface is used to abut or connect with the tab.

3. The cell according to claim 1, wherein The first pole and the second pole are arranged on the same side of the shell.

4. The single cell according to any one of claims 1 to 3, characterized in that, The outer periphery of the first pole is provided with an insulating member.

5. The single cell according to any one of claims 1 to 3, characterized in that, The first pole is an integrally formed structural member.

6. The cell according to claim 4, wherein The first pole is an integrally formed structural member.

7. The cell according to any one of claims 1 to 3, wherein The first pole and the second pole comprise a connecting block and a connecting pole, and the first surface and the second surface are formed on the connecting block; a first hole is arranged on the second surface, the connecting pole is inserted into the first hole, and the connecting pole is connected with the inner wall of the first hole.

8. The cell according to claim 4, wherein The first pole and the second pole comprise a connecting block and a connecting pole, and the first surface and the second surface are formed on the connecting block; a first hole is arranged on the second surface, the connecting pole is inserted into the first hole, and the connecting pole is connected with the inner wall of the first hole.

9. The single cell according to any one of claims 1 to 3, wherein, The first pole is a copper pole.

10. A battery module, characterized by The battery module comprises: a plurality of single batteries, the plurality of single batteries comprising a first single battery, at least one second single battery and a third single battery arranged side by side, the first single battery and the third single battery being located on the outer side of the battery module, the at least one second single battery being located between the first single battery and the third single battery, the first single battery, the second single battery and the third single battery being the single battery of any one of claims 1-9; a plurality of tabs, the plurality of tabs comprising: a first tab connected with the first single battery; at least one second tab, the first single battery, at least one second single battery and the third single battery being connected by the second tab two by two; a third tab connected with the third single battery.

11. The battery module of claim 10, wherein: a surface of the first tab away from the first single battery is flush with the second surface of the first single battery.

12. The battery module of claim 10 or 11, wherein, The first tab comprises a copper tab.

13. The battery module of claim 10 or 11, wherein, A second hole is arranged on the first tab, and the second surface of the first single battery is accommodated in the second hole.

14. A battery pack, characterized by The battery module comprises: a first battery module and a second battery module, the first battery module or the second battery module being the battery module of any one of claims 10-13; the battery pack comprises a first electrical connection end and a second electrical connection end; the first electrical connection end is connected with the first tab of the first battery module; the third tab of the first battery module is connected with the first tab of the second battery module; The second electric connection end is connected with a third bar piece of the second battery module.

15. An electrical device, characterized by The electric device comprises a device shell and the battery pack of claim 14, The battery pack is located in the device shell.

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