Battery system and electric equipment

Abstract

The utility model discloses a battery system and electric equipment. The battery system comprises a plurality of battery modules, each battery module comprises a plurality of battery monomers, and a total positive terminal and a total negative terminal of the battery system are located on a first battery monomer and a second battery monomer of the end battery module; the end part battery modules are battery modules positioned at the end parts in the arrangement direction of the plurality of battery modules; the first battery single body and the second battery single body are adjacent battery single bodies in the end part battery module, or the first battery single body and the second battery single body are two battery single bodies located at the end part in the arrangement direction of the plurality of batteries in the end part battery module; the leading-out end of the first module and the leading-in end of the second module are respectively positioned on two battery monomers which are closest to each other between the first module and the second module, and the first module and the second module are any two adjacent battery modules in the plurality of battery modules. By adopting the battery system, the length of the copper bar leading out the total positive terminal or the total negative terminal can be effectively shortened, and the cost of the battery system is reduced.

Description

Technical Field

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

[0002] The battery system is composed of battery modules, which are composed of multiple battery cells connected in series. When the battery system includes multiple battery modules, at least two long copper bars are required to connect two adjacent battery modules in series, and to lead the total positive and negative wiring of the battery system to the same side of the battery system, so as to facilitate the connection of the battery system with external components.

[0003] However, the more battery modules there are in a battery system, the more the number or length of the long copper bars will be, which makes the cost of the battery system higher. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a battery system that can avoid leading the total positive terminal and the total negative terminal across the battery system to the same side through a long copper busbar, that is, effectively shortening the length of the copper busbar leading out the total positive terminal or the total negative terminal, thereby reducing the cost of the battery system.

[0005] In the first aspect, the present application provides a battery system. The battery system includes: a plurality of battery modules, the battery modules include a plurality of battery cells, the total positive terminal and the total negative terminal of the battery system are located on the first battery cell and the second battery cell of the end battery module; the end battery module is a battery module located at the end of the arrangement direction of the plurality of battery modules; the first battery cell and the second battery cell are adjacent battery cells in the end battery module, or the first battery cell and the second battery cell are two battery cells located at the two ends of the arrangement direction of the plurality of batteries in the end battery module; the lead-out terminal of the first module and the lead-in terminal of the second module are respectively located on the two battery cells closest to the first module and the second module; the first module and the second module are any two adjacent battery modules in the plurality of battery modules.

[0006] In combination with the first aspect, in a possible implementation, the battery system includes a third battery cell, which is a battery cell close to the first battery cell among the two battery cells located at the end of the battery module in the battery arrangement direction; the first battery cell is connected in series to the third battery cell of the end battery module in sequence along the battery arrangement direction of the end battery module, the third battery cells of multiple battery modules are connected in series, and the third battery cells of the third module among the remaining battery cells are connected in series in sequence along the battery module arrangement direction until the second battery cell; wherein the third module is a battery module located at the end of the battery module arrangement direction except the end battery module.

[0007] In combination with the first aspect, in a possible implementation manner, when the number of battery modules is an even number, the first battery cell and the second battery cell are adjacent battery cells in the end battery module.

[0008] In combination with the first aspect, in a possible implementation manner, when the number of battery modules is an odd number, the first battery cell and the second battery cell are two battery cells located at ends of the end battery module.

[0009] In combination with the first aspect, in a possible implementation, when the number of battery cells in the battery module is an even number, the total positive terminal and the total negative terminal are located on the same side in a direction perpendicular to the battery arrangement direction of the end battery module.

[0010] In combination with the first aspect, in a possible implementation, when the number of battery modules in the battery system is an even number and the number of battery cells in the battery module is an odd number, the total positive terminal and the total negative terminal are located on the same side of the end battery module.

[0011] In combination with the first aspect, in one possible implementation, when the number of battery modules in the battery system is an odd number and the number of battery cells in the battery module is an odd number, the total positive terminal and the total negative terminal are located on different sides in a direction perpendicular to the battery arrangement direction of the end battery module.

[0012] In combination with the first aspect, in a possible implementation, the battery modules are connected via a connecting piece, and the length of the connecting piece is less than the sum of the lengths of the two battery cells.

[0013] In combination with the first aspect, in a possible implementation manner, the number of battery cells in different battery modules is the same.

[0014] In combination with the first aspect, in a possible implementation manner, the number of battery cells in different battery modules is different.

[0015] In combination with the first aspect, in a possible implementation, when the number of battery cells in the end battery module is odd and the number of battery cells in the remaining battery modules is even, the total positive terminal and the total negative terminal are located on the same side in a direction perpendicular to the battery arrangement direction of the end battery module.

[0016] In a second aspect, the present application further provides an electrical device, which includes the battery system and the electrical device as described in the first aspect, wherein the battery system is used to supply power to the electrical device.

[0017] The embodiment of the present application provides a battery system and an electric device, wherein the battery system includes a plurality of battery modules, the battery modules include a plurality of battery cells, the total positive terminal and the total negative terminal of the battery system are located on the first battery cell and the second battery cell of the end battery module; the end battery module is a battery module located at the end of the arrangement direction of the plurality of battery modules; the first battery cell and the second battery cell are adjacent battery cells in the end battery module, or two battery cells located at the two ends of the arrangement direction of the plurality of batteries in the end battery module. The lead-out terminal of the first module and the lead-in terminal of the second module are respectively located on the two battery cells closest to the first module and the second module, and the first module and the second module are any two adjacent battery modules in the plurality of battery modules. In the embodiment of the present application, the total positive terminal and the total negative terminal of the battery system are arranged on the two battery cells of the battery module at the end of the battery system, so that the total positive terminal and the total negative terminal can be avoided from being led to the same side across the battery system through a long copper busbar, that is, the length of the copper busbar leading out the total positive terminal or the total negative terminal is effectively shortened, and the cost of the battery system is reduced. Moreover, in the present application, adjacent battery modules are connected in series through the two closest battery cells, avoiding connecting the lead-out terminals and lead-in terminals of adjacent battery modules across the battery modules, effectively reducing the length of the connecting piece and further reducing the cost of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 is a schematic diagram of the existing structure of a battery system;

[0020] Figure 2 is a schematic structural diagram of a battery system in one embodiment;

[0021] Figure 3 is another structural schematic diagram of a battery system in one embodiment;

[0022] Figure 4 is another structural schematic diagram of a battery system in one embodiment;

[0023] Figure 5 is another structural schematic diagram of a battery system in one embodiment;

[0024] Figure 6 is another structural schematic diagram of a battery system in one embodiment;

[0025] Figure 7 FIG. 4 is another schematic diagram of the structure of a battery system in an embodiment.

[0026] Explanation of the reference numerals: 10 - battery module, 11 - end battery module, 20 - battery cell, 21 - first battery cell, 22 - second battery cell, 23 - third battery cell, 30 - total positive terminal, 40 - total negative terminal. DETAILED DESCRIPTION

[0027] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] It should be noted that the battery system provided in the embodiment of the present application is applied to a battery system in which battery cells are connected in series.

[0033] like Figure 1 As shown, the battery system is composed of a battery module, and the battery module is composed of a plurality of battery cells connected in series. When the battery system includes multiple battery modules, the first battery cell of the first battery module is often connected in series to the last battery cell of the last battery module. Therefore, at least two long copper bars are required to respectively connect two adjacent battery modules in series, and to lead the total positive connection and the total negative connection of the battery system to the same side of the battery system, so as to facilitate the connection of the battery system with external components. However, the more battery modules there are in the battery system, the more long copper bars there are or the longer they are, which makes the cost of the battery system higher.

[0034] Based on this, the present application provides a battery system and electrical equipment to solve the problem that the battery system cost is high due to the large number or length of the long copper bars.

[0035] like Figure 2 As shown, a battery system is provided, which includes a plurality of battery modules 10, the battery modules include a plurality of battery cells 20, the total positive terminal 30 and the total negative terminal 40 of the battery system are located on the first battery cell 21 and the second battery cell 22 of the end battery module 11; the end battery module 11 is a battery module 10 located at the end of the arrangement direction of the plurality of battery modules; the first battery cell 21 and the second battery cell 22 are adjacent battery cells in the end battery module 11, or the first battery cell 21 and the second battery cell 22 are two battery cells 20 located at the two ends of the arrangement direction of the plurality of batteries in the end battery module 11; the lead-out terminal of the first module and the lead-in terminal of the second module are respectively located on the two battery cells 20 closest to the first module and the second module; the first module and the second module are any two adjacent battery modules in the plurality of battery modules. It can be understood that the end battery module 11 can be the first module.

[0036] In the embodiment of the present application, the total positive terminal 30 and the total negative terminal 40 of the battery system are arranged on two battery cells 20 of the same battery module 10, and then the battery cells 20 are sequentially connected in series from the total negative terminal 40 to the total positive terminal 30 to complete the circuit connection of the battery system. The above-mentioned arrangement of the total positive terminal 30 and the total negative terminal 40 can avoid leading the total positive terminal 30 and the total negative terminal 40 across the battery system to the same side through a long copper busbar, that is, effectively shortening the length of the copper busbar leading out the total positive terminal 30 or the total negative terminal 40, thereby effectively reducing the cost of the battery system.

[0037] Preferably, the total positive terminal 30 and the total negative terminal 40 are arranged on two battery cells 20 of the battery module 10 at the end of the battery system along the battery module arrangement direction, that is, the first battery cell 21 and the second battery cell 22 of the end battery module 11, so that after a plurality of battery modules 10 are packaged into a battery system, the total positive terminal 30 and the total negative terminal 40 of the battery system are located on the same side of the battery system, which is convenient for connecting the battery system with other components.

[0038] It should be noted that the total positive terminal 30 may be the positive electrode of the first battery cell 21, and the total negative terminal 40 may be the negative electrode of the second battery cell 22; or the total positive terminal 30 may be the positive electrode of the second battery cell 21, and the total negative terminal 40 may be the negative electrode of the first battery cell 22. This application does not limit this. The following description is based on the example that the total negative terminal 40 is the negative electrode of the first battery cell 22, and the total positive terminal 30 is the positive electrode of the second battery cell 21.

[0039] In one embodiment, in order to ensure that the total positive terminal 30 and the total negative terminal 40 of the battery system are located at the end battery module 11, and at the same time ensure that each battery cell in the battery system is connected in series in the circuit, it is necessary to determine the positions of the first battery cell 21 and the second battery cell 22 in the end battery module 11 according to the number of battery modules 10 in the battery system.

[0040] When the number of battery modules 10 is an even number, the first battery cell 21 and the second battery cell 22 are adjacent battery cells in the end battery module 11 .

[0041] The battery system includes two battery modules 10 , for example. The first battery cell 21 and the second battery cell 22 may be any two adjacent battery cells in the end battery module 11 .

[0042] As above Figure 2 As shown, the first battery cell 21 and the second battery cell 22 are two battery cells at the middle position along the battery arrangement direction in the end battery module 11. At this time, the circuit connection method of the battery system is: starting from the total negative terminal 40, through the first battery cell 21, connected in series to the battery cell at the end of the end battery module 11 close to the first battery cell 21, and then connected in series with the battery cell at the opposite position in the adjacent battery module, and each battery cell in the adjacent battery module is connected in series in sequence, and then connected in series with the battery cell at the end of the end battery module 11 close to the second battery cell 22, and finally connected in series to the second battery cell 22 in sequence, and ended at the total positive terminal 30.

[0043] like Figure 3As shown, the first battery cell 21 and the second battery cell 22 may be two battery cells at the end of the end battery module 11 along the battery arrangement direction. At this time, the circuit connection mode of the battery system is: starting from the total negative terminal 40, passing through the first battery cell 21 and connected in series with the battery cells at the opposite position in the adjacent battery module, and then connected in series with each battery cell in the adjacent battery module in sequence, and then connected in series with the battery cells at the end of the end battery module 11 except the first battery cell 21, and finally connected in series to the second battery cell 22 in sequence, and ending at the total positive terminal 30.

[0044] When the number of the battery modules 10 is an odd number, the first battery cell 21 and the second battery cell 22 are two battery cells located at two ends of the end battery module 11 in the arrangement direction of the plurality of batteries.

[0045] The battery system includes three battery modules 10 as an example for description.

[0046] like Figure 4 As shown, the first battery cell 21 and the second battery cell 22 are respectively located at the two ends of the end battery module 11. At this time, the circuit connection mode of the battery system is: starting from the total negative terminal 40, passing through the first battery cell 21 and connected in series with the battery cells in the adjacent battery module (i.e., the battery cells at the end of the adjacent battery module), until the battery cells at the end of the last battery module are connected in series; then the battery cells in the last battery module are connected in series in sequence until the last battery cell of the last battery module; then starting from the last battery cell of the last battery module, the battery cells in the adjacent battery module (i.e., the last battery cell of the adjacent battery module) are connected in series, and the remaining battery cells in the adjacent battery module are connected in series in sequence until the battery cells in the adjacent battery module that are adjacent to the end battery cells; finally, starting from the battery cells in the adjacent battery module that are adjacent to the end battery cells, the battery cells in the end battery module 11 that are opposite in position are connected in series, and the remaining battery cells in the end battery module 11 are connected in series in sequence until the second battery cell 22, and ending with the total positive terminal 30.

[0047] In summary, the battery system includes a third battery cell 23, which is a battery cell close to the first battery cell 21 among the two battery cells 20 at the end of the battery module 10 in the battery arrangement direction; the circuit connection method of the battery system is: the first battery cell 21 is sequentially connected in series to the third battery cell 23 of the end battery module 11 along the battery arrangement direction of the end battery module 11, the third battery cells 23 of multiple battery modules 10 are connected in series, and the third battery cells of the third module in the remaining battery cells 20 are sequentially connected in series along the battery module arrangement direction until the second battery cell 22. Among them, the third module is a battery module located at the end of the battery module arrangement direction except the end battery module 11. It can be understood that the third module can be the second module.

[0048] The battery system provided in the embodiment of the present application includes a plurality of battery modules, and the battery module includes a plurality of battery cells. The total positive terminal and the total negative terminal of the battery system are located on the first battery cell and the second battery cell of the end battery module; wherein the end battery module is a battery module located at the end of the arrangement direction of the plurality of battery modules. When the number of battery modules is an even number, the first battery cell and the second battery cell are adjacent battery cells in the end battery module; when the number of battery modules is an odd number, the first battery cell and the second battery cell are two battery cells located at both ends of the battery arrangement direction of the end battery module. In the embodiment of the present application, the total positive terminal and the total negative terminal of the battery system are set on the two battery cells of the battery module at the end of the battery system, which can avoid leading the total positive terminal and the total negative terminal across the battery system to the same side through a long copper busbar, that is, effectively shortening the length of the copper busbar leading out the total positive terminal or the total negative terminal, thereby reducing the cost of the battery system. At the same time, based on the above settings, when adjacent battery modules in the battery system of the present application are connected in series, the series connection is achieved through the relatively positioned battery cells, that is, through the two battery cells closest to each other, which can shorten the length of the connecting piece between the battery modules and effectively reduce the cost of the battery system.

[0049] In one embodiment, the number of battery cells 20 in the battery module 10 is different, and the orientation relationship between the total positive terminal 30 and the total negative terminal 40 in the end battery module 11 is different.

[0050] When the number of battery cells 20 in the battery module 10 is an even number, the total positive terminal 30 and the total negative terminal 40 are located on the same side of the end battery module 11 in a direction perpendicular to the battery arrangement direction.

[0051] As above Figure 2-4 As shown, when the battery module 10 includes ten battery cells 20 , the total positive terminal 30 and the total negative terminal 40 are located on the same side of the end battery module 11 in a direction perpendicular to the battery arrangement direction.

[0052] In this case, the battery modules 10 are connected by a connecting piece, and the length of the connecting piece is less than the sum of the lengths of the two battery cells 20. That is, in this case, two adjacent battery modules are connected by the two battery cells that are closest to each other, so the two adjacent battery modules are connected by a short connecting piece, and the short connecting piece does not need to span the length of the two battery cells, so the length of the short connecting piece is less than the sum of the lengths of the two battery cells 20. The length of the short connecting piece can be copper or aluminum.

[0053] When the number of battery modules 10 in the battery system is even and the number of battery cells 20 in the battery module 10 is odd, the total positive terminal 30 and the total negative terminal 40 are located on the same side in the direction perpendicular to the battery arrangement direction of the end battery module 11.

[0054] like Figure 5 As shown, the battery system includes two battery modules 10. When the battery module 10 includes nine battery cells 20, the total positive terminal 30 and the total negative terminal 40 are located on the same side of the end battery module 11 in the vertical direction of the battery arrangement direction.

[0055] In this case, it is necessary to increase the setting of long copper bars to connect two adjacent battery modules. However, compared with the length of the long copper bars connecting two diagonal battery cells (i.e., the farthest distance) in two adjacent battery modules in the prior art, the length of the long copper bars used in the present application to connect two battery cells that are relatively located (i.e., the closest distance) in two adjacent battery modules is shorter, which can effectively reduce the length of the long copper bars in the battery system, thereby reducing the cost of the battery system.

[0056] When the number of battery modules 10 in the battery system is odd and the number of battery cells 20 in the battery module 10 is odd, the total positive terminal 30 and the total negative terminal 40 are located on different sides in the vertical direction of the battery arrangement direction of the end battery module 11.

[0057] like Figure 6 As shown, the battery system includes three battery modules 10. When the battery module 10 includes nine battery cells 20, the total positive terminal 30 and the total negative terminal 40 are located on different sides of the end battery module 11 in the vertical direction of the battery arrangement direction.

[0058] In this case, it is necessary to increase the setting of long copper bars to connect two adjacent battery modules. However, compared with the length of the long copper bars connecting two diagonal battery cells (i.e., the farthest distance) in two adjacent battery modules in the prior art, the length of the long copper bars used in the present application to connect two battery cells that are relatively located (i.e., the closest distance) in two adjacent battery modules is shorter, which can effectively reduce the length of the long copper bars in the battery system, thereby reducing the cost of the battery system.

[0059] In order to facilitate the connection between the battery system and external devices, the main terminal ( Figure 6 The main positive terminal is led to the outside of the battery system, and faces one side with the other main terminal. Although a long copper bar is added, the length of the long copper bar is much shorter than the length of the long copper bar that leads the main terminal from the last battery cell of the last battery module to the end battery module in the prior art, further reducing the cost of the battery system.

[0060] In the battery system provided by the embodiment of the present application, when the number of battery cells in the battery module is an even number, or when the number of battery modules in the battery system is an even number and the number of battery cells in the battery module is an odd number, the total positive terminal and the total negative terminal are located on the same side in the vertical direction of the battery arrangement direction of the end battery module; when the number of battery modules is an odd number and the number of battery cells in the battery module is an odd number, the total positive terminal and the total negative terminal are located on different sides in the vertical direction of the battery arrangement direction of the end battery module. In the case where the number of battery cells is an odd number, it is necessary to increase the setting of the long copper bar to connect two adjacent battery modules. However, compared with the length of the long copper bar connecting two battery cells diagonally (i.e., the farthest distance) in two adjacent battery modules in the prior art, the length of the long copper bar used in the present application to connect two battery cells in opposite positions (i.e., the closest distance) in two adjacent battery modules is smaller, which can effectively reduce the length of the long copper bar in the battery system, thereby reducing the cost of the battery system. When the two main terminals are located on different sides of the end battery module, in order to facilitate the connection between the battery system and external devices, the main terminal facing the inside of the battery system needs to be led to the outside of the battery system through a long copper bar, facing the same side as the other main terminal. Although the long copper bar is added, the length of the long copper bar is much shorter than the length of the long copper bar that leads the main terminal from the last battery cell of the last battery module to the end battery module in the prior art, further reducing the cost of the battery system.

[0061] The above embodiment introduces the case where the number of battery cells 20 in different battery modules 10 is the same. In this case, the structure and parameters of the battery system are more standardized.

[0062] In one embodiment, the number of battery cells 20 in different battery modules 10 may also be different. The number of battery cells 20 in each battery module 10 may be specifically set according to space or usage requirements, and the structure of the battery system is more flexible and more suitable for actual usage. This situation also affects the orientation relationship of the two main terminals. The following is an example of a battery system including two battery modules.

[0063] When the number of battery cells 20 in the end battery module 11 is an odd number and the number of battery cells 20 in the remaining battery modules 10 is an even number, the total positive terminal 30 and the total negative terminal 40 are located on the same side of the end battery module 11 in a direction perpendicular to the battery arrangement direction.

[0064] like Figure 7 As shown, when the end battery module 11 includes nine battery cells 20 and the remaining battery module 10 includes ten battery cells 20 , the total positive terminal 30 and the total negative terminal 40 are located on the same side of the end battery module 11 in a direction perpendicular to the battery arrangement direction.

[0065] In one embodiment, an electrical device is provided. The electrical device includes the battery system and the electrical device as described in the above embodiment. The battery system is used to supply power to the electrical device.

[0066] The battery system includes multiple battery modules 10, each of which includes multiple battery cells 20. The total positive terminal 30 and the total negative terminal 40 of the battery system are located on the first battery cell 21 and the second battery cell 22 of the end battery module 11; the end battery module 11 is a battery module 10 located at the end of the arrangement direction of the multiple battery modules; the first battery cell 21 and the second battery cell 22 are adjacent battery cells in the end battery module 11, or the first battery cell 21 and the second battery cell 22 are two battery cells 20 located at the two ends of the arrangement direction of the multiple batteries in the end battery module 11; the lead-out terminal of the first module and the lead-in terminal of the second module are respectively located on the two battery cells 20 closest to the first module and the second module; the first module and the second module are any two adjacent battery modules among the multiple battery modules.

[0067] In the embodiment of the present application, the total positive terminal 30 and the total negative terminal 40 of the battery system are arranged on two battery cells 20 of the same battery module 10, and then the battery cells 20 are sequentially connected in series from the total negative terminal 40 to the total positive terminal 30 to complete the circuit connection of the battery system. The above-mentioned arrangement of the total positive terminal 30 and the total negative terminal 40 can avoid leading the total positive terminal 30 and the total negative terminal 40 across the battery system to the same side through a long copper busbar, that is, effectively shortening the length of the copper busbar leading out the total positive terminal 30 or the total negative terminal 40, thereby effectively reducing the cost of the battery system.

[0068] Preferably, the total positive terminal 30 and the total negative terminal 40 are arranged on two battery cells 20 of the battery module 10 at the end of the battery system along the battery module arrangement direction, that is, the first battery cell 21 and the second battery cell 22 of the end battery module 11, so that after a plurality of battery modules 10 are packaged into a battery system, the total positive terminal 30 and the total negative terminal 40 of the battery system are located on the same side of the battery system, which is convenient for connecting the battery system with other components.

[0069] It should be noted that the total positive terminal 30 may be the positive electrode of the first battery cell 21, and the total negative terminal 40 may be the negative electrode of the second battery cell 22; or the total positive terminal 30 may be the positive electrode of the second battery cell 21, and the total negative terminal 40 may be the negative electrode of the first battery cell 22. This application does not limit this. The following description is based on the example that the total negative terminal 40 is the negative electrode of the first battery cell 22, and the total positive terminal 30 is the positive electrode of the second battery cell 21.

[0070] In one embodiment, in order to ensure that the total positive terminal 30 and the total negative terminal 40 of the battery system are located at the end battery module 11, and at the same time ensure that each battery cell in the battery system is connected in series in the circuit, it is necessary to determine the positions of the first battery cell 21 and the second battery cell 22 in the end battery module 11 according to the number of battery modules 10 in the battery system.

[0071] When the number of battery modules 10 is an even number, the first battery cell 21 and the second battery cell 22 are adjacent battery cells in the end battery module 11 .

[0072] The battery system includes two battery modules 10 , for example. The first battery cell 21 and the second battery cell 22 may be any two adjacent battery cells in the end battery module 11 .

[0073] As above Figure 2 As shown, the first battery cell 21 and the second battery cell 22 are two battery cells at the middle position along the battery arrangement direction in the end battery module 11. At this time, the circuit connection method of the battery system is: starting from the total negative terminal 40, through the first battery cell 21, connected in series to the battery cell at the end of the end battery module 11 close to the first battery cell 21, and then connected in series with the battery cell at the opposite position in the adjacent battery module, and each battery cell in the adjacent battery module is connected in series in sequence, and then connected in series with the battery cell at the end of the end battery module 11 close to the second battery cell 22, and finally connected in series to the second battery cell 22 in sequence, and ended at the total positive terminal 30.

[0074] As above Figure 3 As shown, the first battery cell 21 and the second battery cell 22 may be two battery cells at the end of the end battery module 11 along the battery arrangement direction. At this time, the circuit connection mode of the battery system is: starting from the total negative terminal 40, passing through the first battery cell 21 and connected in series with the battery cells at the opposite position in the adjacent battery module, and then connected in series with each battery cell in the adjacent battery module in sequence, and then connected in series with the battery cells at the end of the end battery module 11 except the first battery cell 21, and finally connected in series to the second battery cell 22 in sequence, and ending at the total positive terminal 30.

[0075] When the number of the battery modules 10 is an odd number, the first battery cell 21 and the second battery cell 22 are two battery cells located at two ends of the end battery module 11 in the arrangement direction of the plurality of batteries.

[0076] The battery system includes three battery modules 10 as an example for description.

[0077] As above Figure 4 As shown, the first battery cell 21 and the second battery cell 22 are respectively located at the two ends of the end battery module 11. At this time, the circuit connection mode of the battery system is: starting from the total negative terminal 40, passing through the first battery cell 21 and connected in series with the battery cells in the adjacent battery module (i.e., the battery cells at the end of the adjacent battery module), until the battery cells at the end of the last battery module are connected in series; then the battery cells in the last battery module are connected in series in sequence until the last battery cell of the last battery module; then starting from the last battery cell of the last battery module, the battery cells in the adjacent battery module (i.e., the last battery cell of the adjacent battery module) are connected in series, and the remaining battery cells in the adjacent battery module are connected in series in sequence until the battery cells in the adjacent battery module that are adjacent to the end battery cells; finally, starting from the battery cells in the adjacent battery module that are adjacent to the end battery cells, the battery cells in the end battery module 11 that are opposite in position are connected in series, and the remaining battery cells in the end battery module 11 are connected in series in sequence until the second battery cell 22, and ending with the total positive terminal 30.

[0078] In summary, the battery system includes a third battery cell 23, which is a battery cell close to the first battery cell 21 among the two battery cells 20 at the end of the battery module 10 in the battery arrangement direction; the circuit connection method of the battery system is: the first battery cell 21 is sequentially connected in series to the third battery cell 23 of the end battery module 11 along the battery arrangement direction of the end battery module 11, the third battery cells 23 of multiple battery modules 10 are connected in series, and the third battery cells 23 of the third module in the remaining battery cells 20 are sequentially connected in series along the battery module arrangement direction until the second battery cell 22. Among them, the third module is a battery module located at the end of the battery module arrangement direction except the end battery module 11.

[0079] The electric equipment provided in the embodiment of the present application includes a battery system, the battery system includes a plurality of battery modules, the battery module includes a plurality of battery cells, the total positive terminal and the total negative terminal of the battery system are located on the first battery cell and the second battery cell of the end battery module; the lead-out terminal and the lead-in terminal of the adjacent battery module are respectively located on the two battery cells closest to the adjacent battery modules; wherein the end battery module is a battery module located at the end of the arrangement direction of the plurality of battery modules. When the number of battery modules is an even number, the first battery cell and the second battery cell are adjacent battery cells at both ends of the battery arrangement direction of the end battery module; when the number of battery modules is an odd number, the first battery cell and the second battery cell are two battery cells located at the end of the end battery module. In the embodiment of the present application, the total positive terminal and the total negative terminal of the battery system are set on the two battery cells of the battery module at the end of the battery system, which can avoid the total positive terminal and the total negative terminal being led to the same side across the battery system through a long copper busbar, that is, effectively shortening the length of the copper busbar leading out the total positive terminal or the total negative terminal, thereby reducing the cost of the battery system, thereby reducing the cost of the electric equipment. At the same time, based on the above settings, when adjacent battery modules in the battery system of the present application are connected in series, the series connection is achieved through the two battery cells closest to each other, which can shorten the length of the connecting plate between the battery modules, further reduce the cost of the battery system, and thus effectively reduce the cost of electrical equipment.

[0080] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. A battery system, characterized in that: The battery system comprises a plurality of battery modules, each of which comprises a plurality of battery cells; a total positive terminal and a total negative terminal of the battery system are located on a first battery cell and a second battery cell of an end battery module; the end battery module is a battery module located at an end of the arrangement direction of the plurality of battery modules; the first battery cell and the second battery cell are adjacent battery cells in the end battery module, or the first battery cell and the second battery cell are two battery cells in the end battery module respectively located at two ends of the arrangement direction of the plurality of battery cells; The lead-out end of the first module and the lead-in end of the second module are respectively located on two battery cells that are closest to each other between the first module and the second module. The first module and the second module are any two adjacent battery modules among the multiple battery modules.

2. The battery system according to claim 1, characterized in that: The battery system includes a third battery cell, which is a battery cell close to the first battery cell among the two battery cells located at the ends of the battery cell arrangement direction of the battery module; The first battery cell is connected in series in sequence along the battery cell arrangement direction of the end battery module to the third battery cell of the end battery module, the third battery cells of multiple battery modules are connected in series, and the third battery cells of the third module among the remaining battery cells are connected in series in sequence along the battery module arrangement direction until the second battery cell; wherein the third module is a battery module located at the end of the battery module arrangement direction except the end battery module.

3. The battery system according to claim 1, characterized in that: When the number of the battery modules is an even number, the first battery cell and the second battery cell are adjacent battery cells in the end battery module.

4. The battery system according to claim 1, characterized in that: When the number of the battery modules is an odd number, the first battery cell and the second battery cell are two battery cells in the end battery module respectively located at two ends of the arrangement direction of the plurality of battery cells.

5. The battery system according to claim 1, characterized in that: When the number of battery cells in the battery module is an even number, the total positive terminal and the total negative terminal are located on the same side in a direction perpendicular to the arrangement direction of the battery cells of the end battery module.

6. The battery system according to claim 1, characterized in that: When the number of battery modules in the battery system is an even number and the number of battery cells in the battery module is an odd number, the total positive terminal and the total negative terminal are located on the same side of the end battery module.

7. The battery system according to claim 1, characterized in that: When the number of battery modules in the battery system is an odd number and the number of battery cells in the battery module is an odd number, the total positive terminal and the total negative terminal are located on different sides in a direction perpendicular to the arrangement direction of the battery cells in the end battery module.

8. The battery system according to claim 5, characterized in that: The battery modules are connected via a connecting piece, and the length of the connecting piece is less than the sum of the lengths of the two battery cells.

9. The battery system according to claim 1, characterized in that: The number of battery cells in different battery modules is the same.

10. The battery system according to claim 1, characterized in that: The number of battery cells in different battery modules is different.

11. The battery system according to claim 10, characterized in that: When the number of battery cells in the end battery module is odd and the number of battery cells in the remaining battery modules is even, the total positive terminal and the total negative terminal are located on the same side in a direction perpendicular to the arrangement direction of the battery cells in the end battery module.

12. An electrical device, characterized in that: The electrical equipment comprises the battery system and the electrical equipment as claimed in claim 1, The battery system is used to supply power to the electrical appliances.

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