Battery packs and energy storage devices

Abstract

The present application provides a battery pack and an energy storage device. The battery pack includes a plurality of battery modules. Each battery module includes a first electrode and a second electrode with opposite polarities, and the first electrode and the second electrode of the same battery module are located on the same side of the battery module. The plurality of battery modules include: a first battery module and a second battery module are arranged along a second direction. A third battery module and a first battery module are arranged along a third direction. A third battery module and a fourth battery module are arranged along the second direction. A fourth battery module and a second battery module are arranged along a third direction. The second electrode of the first battery module is connected to the first electrode of the fourth battery module. The first electrode of the second battery module is connected to the second electrode of the third battery module. The first electrode of the first battery module is the first total electrode of the plurality of battery modules. The second electrode of the second battery module is the second total electrode of the plurality of battery modules.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery pack and an energy storage device. Background Art

[0002] Battery packs include battery modules. Battery modules refer to devices that can activate active materials for continued use by charging after the battery cells are discharged. Battery packs are widely used in energy storage devices. In the development of battery technology, how to ensure the safety of battery packs is one of the research directions in battery technology. Summary of the invention

[0003] In view of the above problems, the present application provides a battery pack and an energy storage device that can reduce the possibility of generating electromagnetic interference.

[0004] The present application provides a battery pack, which includes a plurality of battery modules. Each battery module includes a first electrode and a second electrode with opposite polarities, and the first electrode and the second electrode of the same battery module are located on the same side of the battery module. The plurality of battery modules include: a first battery module, a second battery module, a third battery module and a fourth battery module. The first electrode and the second electrode of the first battery module are arranged at intervals along a first direction. The first battery module and the second battery module are arranged in a second direction. The second electrode and the first electrode of the second battery module are arranged at intervals along the first direction. The third battery module and the first battery module are arranged in a third direction. The first electrode and the second electrode of the third battery module are arranged at intervals along the first direction. The third battery module and the fourth battery module are arranged in a second direction. The fourth battery module and the second battery module are arranged in a third direction. The second electrode and the first electrode of the fourth battery module are arranged at intervals along the first direction. The second electrode of the first battery module is connected to the first electrode of the fourth battery module. The first electrode of the second battery module is connected to the second electrode of the third battery module. The first electrode of the first battery module is the first total electrode of the plurality of battery modules. The second electrode of the second battery module is a second common electrode of the plurality of battery modules.

[0005] The battery pack of the embodiment of the present application includes a plurality of battery modules. The plurality of battery modules can be arranged in different layers respectively. The first battery module and the second battery module are arranged in the same layer, and the third battery module and the fourth battery module are arranged in the same layer. The first battery module and the fourth battery module are interconnected, the second battery module and the third battery module are interconnected, and cross-layer cross-electrical connection can be achieved between battery modules of different layers. The cross-electrical connection between battery modules of different layers is conducive to forming a current flow path with changing direction. The magnetic field strength generated by the current flow path with changing direction is less than the magnetic field strength generated by the circular current flow path in a single direction, which is conducive to reducing the overall magnetic field strength in the battery pack and reducing the possibility of electromagnetic interference. In addition, the current on the flow path with changing direction can be conducive to generating magnetic fields in different directions. There is a possibility of mutual cancellation and weakening between magnetic fields in different directions, which is also conducive to reducing the overall magnetic field strength in the battery pack and reducing the possibility of electromagnetic interference.

[0006] In one or more of the above optional embodiments, the first electrode of the third battery module is connected to the second electrode of the fourth battery module.

[0007] In one or more optional embodiments above, the plurality of battery modules include a fifth battery module and a sixth battery module. The fifth battery module and the third battery module are arranged along a third direction, and the first electrode and the second electrode of the fifth battery module are arranged at intervals along the first direction. The fifth battery module and the sixth battery module are arranged along the second direction, the sixth battery module and the fourth battery module are arranged along the third direction, and the second electrode and the first electrode of the sixth battery module are arranged at intervals along the first direction. The second electrode of the fourth battery module is connected to the first electrode of the fifth battery module, the second electrode of the sixth battery module is connected to the first electrode of the third battery module, and the second electrode of the fifth battery module is connected to the first electrode of the sixth battery module.

[0008] In one or more of the above optional embodiments, the battery module includes at least one circuit board and a plurality of battery cells, each battery cell includes a main body and an electrode terminal, the electrode terminal of each battery cell is connected to the circuit board, and the circuit board is configured to collect parameters of the battery cell.

[0009] The battery management system can monitor the operating status of the battery cell through the circuit board. For example, when the circuit board collects the battery cell parameters indicating the possibility of thermal runaway of the battery cell, the battery management system can control the battery pack to power off or perform firefighting cooling and fire extinguishing treatment on the battery cell to reduce the possibility of safety hazards in the battery pack and improve the safety of the battery pack.

[0010] In one or more of the above optional embodiments, a circuit board of the first battery module is located between the main body of the first battery module and the main body of the second battery module, and a circuit board of the second battery module is located between the main body of the first battery module and the main body of the second battery module.

[0011] The circuit board can reuse the space between the main body of the first battery module and the main body of the second battery module to improve space utilization. The first battery module and the second battery module can protect the circuit board and reduce the possibility of structural damage and failure of the circuit board due to collision.

[0012] In one or more of the above optional embodiments, a circuit board of the third battery module is located between the main body of the third battery module and the main body of the fourth battery module, and a circuit board of the fourth battery module is located between the main body of the third battery module and the main body of the fourth battery module.

[0013] The circuit board can reuse the space between the main body of the third battery module and the main body of the fourth battery module to improve space utilization. The third battery module and the fourth battery module can protect the circuit board and reduce the possibility of structural damage and failure of the circuit board due to collision.

[0014] In one or more of the above optional embodiments, the circuit board includes a wireless communication module, the battery pack includes a shell, a battery management circuit board and an antenna, multiple battery modules are arranged in the shell, the battery management circuit board is arranged outside the shell, the antenna is arranged on the battery management circuit board, and the wireless communication module is communicatively connected to the antenna.

[0015] The wireless communication method between the wireless communication module and the antenna, on the one hand, reduces the number of connecting wires between the battery management circuit board and the circuit board at the battery module, reduces the difficulty of wiring and installation, and saves space in the shell; on the other hand, the setting position of the circuit board at the battery module is relatively flexible and free, and is no longer restricted by the connecting wires.

[0016] In one or more of the above optional embodiments, the material of the shell includes metal material, the shell is provided with an opening, and the antenna extends into the shell through the opening.

[0017] At least part of the antenna can extend into the shell, which is beneficial to reducing the shielding effect of the shell on the signal, and is beneficial to ensuring smooth and continuous communication between the wireless communication module and the antenna, so as to improve the safety of the battery pack.

[0018] In one or more of the above optional embodiments, the battery pack includes a cover plate, and the cover plate is sealed to the shell.

[0019] In one or more of the above optional embodiments, the battery pack includes a first metal cooling plate, and each battery module is connected to the first metal cooling plate. Along the third direction, the first battery module and the second battery module are located on the same side of the first metal cooling plate, and the third battery module and the fourth battery module are located on the other side of the first metal cooling plate.

[0020] The battery module generates heat during operation. The first metal cooling plate can exchange heat with the battery module to take away the heat generated by the battery module, thereby cooling the battery module and enhancing the heat dissipation of the battery module. The first metal cooling plate can support the first battery module and the second battery module. The first metal cooling plate separates the first battery module from the third battery module. At the same time, the first metal cooling plate also separates the second battery module from the fourth battery module. The first metal cooling plate can simultaneously exchange heat with the first battery module, the second battery module, the third battery module and the fourth battery module, which is beneficial to improve the heat dissipation efficiency.

[0021] In one or more optional embodiments above, the battery pack includes a first electrical connector, the first electrical connector connects the second electrode of the first battery module and the first electrode of the fourth battery module. When viewed along the third direction, along the first direction, the first electrical connector exceeds the first metal cooling plate.

[0022] Generally, a complete coil is required for electric current to generate a magnetic field. The first metal cooling plate is placed in the middle of the battery module, which is equivalent to destroying the entire coil, thereby isolating the magnetic field, reducing the possibility of electromagnetic interference, and improving the safety of the battery pack.

[0023] In one or more of the above optional embodiments, each battery module includes a plurality of battery cells and two end walls, and the plurality of battery cells are located between the two end walls; along the first direction, at least a portion of the first electrical connector is disposed on a side of an end wall of the first battery module away from the battery cells.

[0024] The two end walls can limit and protect the multiple battery cells. The multiple battery cells can be protected by the two end walls, which is conducive to reducing the possibility of damage caused by collision of the battery cells.

[0025] In one or more optional embodiments above, the first electrical connector includes a first conductive sheet, a first bus bar and a first conductive wire bundle, and the first bus bar is disposed on a side of an end wall of the first battery module away from the battery cell. The first conductive sheet connects the second electrode of the first battery module and the first bus bar, and the first conductive wire bundle connects the first electrode of the fourth battery module and the first bus bar.

[0026] The first conductive sheet and the first busbar have good current carrying capacity. The first conductive wire bundle itself has good flexibility and can be bent and deformed relatively easily to bypass obstacles, which is conducive to reducing the difficulty of connecting the first electrode and the first busbar of the fourth battery module.

[0027] In one or more optional embodiments above, the battery pack includes a second electrical connector, which connects the first electrode of the second battery module with the second electrode of the third battery module. When viewed along the third direction, the second electrical connector extends beyond the first metal cooling plate along the first direction.

[0028] In one or more of the above optional embodiments, each battery module includes a plurality of battery cells and two end walls, the plurality of battery cells are located between the two end walls, and along the first direction, at least a portion of the second electrical connector is disposed on a side of an end wall of the second battery module away from the battery cells.

[0029] The two end walls can limit and protect the multiple battery cells. The multiple battery cells can be protected by the two end walls, which is conducive to reducing the possibility of damage caused by collision of the battery cells.

[0030] In one or more optional embodiments above, the second electrical connector includes a second conductive sheet, a second bus bar, and a second conductive wire bundle, and the second bus bar is disposed on a side of an end wall of the second battery module away from the battery cell. The second conductive sheet connects the first electrode and the second bus bar of the second battery module, and the second conductive wire bundle connects the second electrode and the second bus bar of the third battery module.

[0031] The second conductive sheet and the second busbar have good current carrying capacity. The second conductive wire bundle itself has good flexibility, and can be bent and deformed relatively easily to bypass obstacles, which is conducive to reducing the difficulty of connecting the second electrode of the third battery module and the second busbar.

[0032] In one or more optional embodiments above, the battery pack includes a third electrical connector, which connects the first electrode of the third battery module and the second electrode of the fourth battery module. When observed along the third direction, along the first direction, the third electrical connector extends beyond the first metal cooling plate.

[0033] In one or more optional embodiments above, the battery pack includes a fourth electrical connector, the fourth electrical connector is connected to the first electrode of the first battery module, and when viewed along the third direction, the fourth electrical connector exceeds the first metal cooling plate along the first direction. And / or the battery pack includes a fifth electrical connector, the fifth electrical connector is connected to the second electrode of the second battery module, and when viewed along the third direction, the fifth electrical connector exceeds the first metal cooling plate along the first direction.

[0034] The first electrode of the first battery module is the first total electrode of the plurality of battery modules. The first total electrodes of the plurality of battery modules can be led out through the fourth electrical connector, so that the battery pack as a whole can be connected to other electrical devices through the fourth electrical connector.

[0035] The second electrode of the second battery module is the second total electrode of the plurality of battery modules. The second total electrodes of the plurality of battery modules can be led out through the fifth electrical connector, so that the battery pack as a whole can be connected to other electrical devices through the fifth electrical connector.

[0036] In one or more of the above optional embodiments, the first electrode and the second electrode of the first battery module face the second battery module, the second electrode and the first electrode of the second battery module face the first battery module, the first electrode and the second electrode of the third battery module face the fourth battery module, and the second electrode and the first electrode of the fourth battery module face the third battery module, which is beneficial to shortening the connection path between the four battery modules.

[0037] An embodiment of the present application provides an energy storage device, which includes the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. The same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0039] Figure 1 is a schematic structural diagram of a battery pack provided in one embodiment of the present application;

[0040] Figure 2 is a schematic diagram of the exploded structure of a battery pack provided in one embodiment of the present application;

[0041] Figure 3 is a partial structural schematic diagram of a battery module provided in one embodiment of the present application;

[0042] Figure 4 is a schematic diagram of a local simplified structure of a battery pack provided in one embodiment of the present application;

[0043] Figure 5 is a schematic diagram of a local simplified structure of a battery pack provided in one embodiment of the present application;

[0044] Figure 6 is a schematic diagram of a local simplified structure of a battery pack provided in one embodiment of the present application;

[0045] Figure 7 is a partial structural schematic diagram of a battery pack provided in one embodiment of the present application;

[0046] Figure 8 is a partial structural schematic diagram of a battery pack provided in one embodiment of the present application;

[0047] Fig. 9 yes Figure 8 The enlarged schematic diagram of the M in the middle;

[0048] Fig.10 is a partial structural schematic diagram of a battery pack provided in one embodiment of the present application;

[0049] Fig.11 yes Fig.10 The enlarged schematic diagram of R in the middle;

[0050] Fig.12 It is a partial structural schematic diagram of a battery pack according to an embodiment of the present application;

[0051] Fig.13 yes Fig.12 The enlarged schematic diagram of the middle W;

[0052] Fig.14 yes Fig.10 The enlarged schematic diagram of P in the middle;

[0053] Fig.15 It is a schematic diagram of a local simplified structure of a battery pack provided in one embodiment of the present application.

[0054] Description of reference numerals:

[0055] 10. Battery pack;

[0056] 20. Battery module; 201. First battery module; 202. Second battery module; 203. Third battery module; 204. Fourth battery module; 205. Fifth battery module; 206. Sixth battery module;

[0057] 20a, a first electrode; 20b, a second electrode;

[0058] 21, circuit board; 21a, first sub-circuit board; 21b, second sub-circuit board; 211, wireless communication module;

[0059] 22, battery cell; 221, main body; 222, electrode terminal; 222a, positive electrode terminal; 222b, negative electrode terminal;

[0060] 23. End wall;

[0061] 30. housing; 301. opening;

[0062] 40. Battery management circuit board;

[0063] 50. Antenna;

[0064] 60. Cover plate;

[0065] 70. A first metal cooling plate;

[0066] 80. first electrical connector; 81. first conductive sheet; 82. first bus bar; 83. first conductive wire harness;

[0067] 90. second electrical connector; 91. second conductive sheet; 92. second bus bar; 93. second conductive wire harness;

[0068] 100. a third electrical connector;

[0069] 110. a fourth electrical connector;

[0070] 120. a fifth electrical connector;

[0071] 130. Sixth electrical connector;

[0072] 140. seventh electrical connector;

[0073] 150. Eighth electrical connector;

[0074] 160. A second metal cooling plate;

[0075] 200, battery cell unit;

[0076] 300, protective cover;

[0077] 400, thermal conductive adhesive;

[0078] 500, insulation board;

[0079] 600, connecting harness;

[0080] X, first direction;

[0081] Y, second direction;

[0082] Z. Third direction. DETAILED DESCRIPTION

[0083] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples and cannot be used to limit the scope of protection of the present application.

[0084] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0085] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description. They 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 cannot be understood as a limitation on the embodiments of the present application.

[0086] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0087] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "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, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0088] In the related art, a battery pack includes a plurality of battery modules. A battery module refers to a module including battery cells. The plurality of battery modules in a battery pack are arranged in multiple layers. The battery modules in the same layer are electrically connected to each other. However, when the battery modules in the same layer are electrically connected, the current between the battery modules in the same layer will flow along a circular flow path in a single direction. According to the principle of electromagnetic induction, the current can generate a magnetic field, which will generate electromagnetic interference to the magnetic field sensitive devices in the battery pack, affecting the safety of the battery pack.

[0089] In order to improve the problem of electromagnetic interference, the applicant has found that the electrical connection method of the battery module can be designed so that when each battery module is electrically connected, the magnetic field strength generated by the current is reduced, thereby reducing the possibility of electromagnetic interference.

[0090] Based on the above considerations, an embodiment of the present application provides a battery pack. In such a battery pack, there is a cross-layer cross-electrical connection between battery modules in different layers, which is conducive to forming current flow paths with different directions, and the currents on different flow paths can generate magnetic fields in different directions. There is a possibility of mutual cancellation between magnetic fields in different directions, which is conducive to reducing the overall magnetic field strength in the battery pack, reducing the possibility of electromagnetic interference, and improving the safety of the battery pack.

[0091] Figure 1 The structure of the battery pack 10 is schematically shown. Figure 2 A partial exploded structure of the battery pack 10 is schematically shown. Figure 3 The partial structure of the battery module 20 is schematically shown. Figure 4 A partially simplified structure of the battery pack 10 is schematically shown.

[0092] See also Figures 1 to 4 As shown, the embodiment of the present application provides a battery pack 10, which includes a plurality of battery modules 20. Each battery module 20 includes a first electrode 20a and a second electrode 20b with opposite polarities. The first electrode 20a and the second electrode 20b of the same battery module 20 are located on the same side of the battery module 20.

[0093] In the embodiment of the present application, each battery module 20 includes a first electrode 20a and a second electrode 20b, one of which can be used as a negative electrode and the other as a positive electrode. For ease of description, the following is an example in which the first electrode 20a is a positive electrode and the second electrode 20b is a negative electrode. Figure 5 The simplified diagram schematically shows a partial structure of the battery pack 10. Figure 5 As shown, each battery module 20 includes a plurality of battery cells 22. The plurality of battery cells 22 can be arranged side by side along the first direction X. Each battery cell 22 has a positive electrode and a negative electrode. In each battery module 20, each battery cell 22 can be connected in series. The number of battery cells 22 can be an even number, so that the first electrode 20a and the second electrode 20b of the same battery module 20 are located on the same side of the battery module 20. Alternatively, Figure 6 The simplified diagram schematically shows a partial structure of the battery pack 10. Figure 6 As shown, two or more battery cells 22 are first connected in parallel to form a battery cell unit 200. The multiple battery cell units 200 are then connected in series. The number of battery cell units 200 can be an even number, so that the first electrode 20a and the second electrode 20b of the same battery module 20 are located on the same side of the battery module 20.

[0094] See also Figure 3 and Figure 8Each battery cell 22 includes a main body 221 and an electrode terminal 222. The electrode terminal 222 includes a positive terminal 222a and a negative terminal 222b. The electrode terminal 222 can be used to output the electric energy of the battery cell 22 or input the electric energy into the battery cell 22.

[0095] In some feasible embodiments, the battery cell 22 is a soft-pack battery cell, and the positive terminal 222a and the negative terminal 222b are located on both sides of the battery cell 22. The electrode terminals 222 of adjacent battery cells are bent and connected to each other, which helps to simplify the connection between the battery cells 22, so that the first electrode 20a and the second electrode 20b are located on the same side of the battery module 20.

[0096] In some possible implementations, see Figure 3 As shown, among the multiple battery cells 22, in the two outermost battery cell units 200, the positive terminal 222a of one of the battery cell units 200 serves as the positive electrode of the multiple battery cells 22, and the negative terminal 222b of one of the battery cell units 200 serves as the negative electrode of the multiple battery cells 22. The battery module 20 includes a positive electrode bus, which is connected to the positive electrodes of the multiple battery cells 22 and serves as the first electrode 20a. The battery module 20 includes a negative electrode bus, which is connected to the negative electrodes of the multiple battery cells 22 and serves as the second electrode 20b.

[0097] In some possible implementations, see Figure 5 As shown, among the multiple battery cells 22, the positive terminal 222a of one of the two outermost battery cells 22 serves as the positive electrode of the multiple battery cells 22, and the negative terminal 222b of one of the battery cells 22 serves as the negative electrode of the multiple battery cells 22. The battery module 20 includes a positive electrode bus, which is connected to the positive electrodes of the multiple battery cells 22 and serves as the first electrode 20a. The battery module 20 includes a negative electrode bus, which is connected to the negative electrodes of the multiple battery cells 22 and serves as the second electrode 20b.

[0098] The plurality of battery modules 20 include a first battery module 201, a second battery module 202, a third battery module 203, and a fourth battery module 204. The first electrode 20a and the second electrode 20b of the first battery module 201 are arranged at intervals along the first direction X. The first battery module 201 and the second battery module 202 are arranged in a row along the second direction Y. The second electrode 20b and the first electrode 20a of the second battery module 202 are arranged at intervals along the first direction X. The third battery module 203 and the first battery module 201 are arranged in a row along the third direction Z. The first electrode 20a and the second electrode 20b of the third battery module 203 are arranged at intervals along the first direction X. The third battery module 203 and the fourth battery module 204 are arranged in a row along the second direction Y. The fourth battery module 204 and the second battery module 202 are arranged in a row along the third direction Z. The second electrode 20b and the first electrode 20a of the fourth battery module 204 are arranged at intervals along the first direction X.

[0099] The second electrode 20b of the first battery module 201 is connected to the first electrode 20a of the fourth battery module 204. The first electrode 20a of the second battery module 202 is connected to the second electrode 20b of the third battery module 203. The first electrode 20a of the first battery module 201 is the first total electrode of the plurality of battery modules 20. The second electrode 20b of the second battery module 202 is the second total electrode of the plurality of battery modules 20. The first electrode 20a of the first battery module 201 and the second electrode 20b of the second battery module 202 are located on the same side of the plurality of battery modules 20, which is conducive to the connection of the battery pack 10 with other devices.

[0100] In some achievable ways, along the second direction Y, the first electrode 20a and the second electrode 20b of the same battery module 20 are located on the same side of the battery module 20. Along the second direction Y, the first electrode 20a and the second electrode 20b of the first battery module 201 face the second battery module 202, and the first electrode 20a and the second electrode 20b of the second battery module 202 face the first battery module 201. Along the second direction Y, the first electrode 20a and the second electrode 20b of the third battery module 203 face the fourth battery module 204, and the first electrode 20a and the second electrode 20b of the fourth battery module 204 face the third battery module 203, which is beneficial to shorten the connection path between the four battery modules 20.

[0101] In some achievable embodiments, the third battery module 203 and the first battery module 201 are arranged at intervals along the third direction Z. A separator may be provided between the third battery module 203 and the first battery module 201 to separate the third battery module 203 from the first battery module 201. Alternatively, the third battery module 203 and the first battery module 201 are arranged in contact with each other along the third direction Z, that is, no separator is provided between the third battery module 203 and the first battery module 201.

[0102] The fourth battery module 204 and the second battery module 202 are arranged in a spaced relationship along the third direction Z. A separator may be provided between the fourth battery module 204 and the second battery module 202 to separate the fourth battery module 204 from the second battery module 202. Alternatively, the fourth battery module 204 and the second battery module 202 are arranged in contact with each other along the third direction Z.

[0103] The first direction X, the second direction Y, and the third direction Z may be perpendicular to each other. In the embodiment of the present application, the first direction X may be the thickness direction of the battery cell 22 , and the second direction Y may be the length direction of the battery cell 22 .

[0104] In the embodiment of the present application, a plurality of battery modules 20 may be connected in series. The first total electrode and the second total electrode of the plurality of battery modules 20 may be used to connect to the battery management circuit board 40. One of the first total electrode and the second total electrode may be a total positive electrode, and the other may be a total negative electrode. For ease of description, the following description is made by taking the first total electrode as the total positive electrode and the second total electrode as the total negative electrode as an example.

[0105] The battery pack 10 of the embodiment of the present application includes a plurality of battery modules 20. The plurality of battery modules 20 can be arranged in different layers. The first battery module 201 and the second battery module 202 are arranged in the same layer, and the third battery module 203 and the fourth battery module 204 are arranged in the same layer. The first battery module 201 and the fourth battery module 204 are interconnected, the second battery module 202 and the third battery module 203 are interconnected, and cross-layer cross-electrical connection can be achieved between the battery modules 20 of different layers. The cross-electrical connection between the battery modules 20 of different layers is conducive to forming a current flow path with a change in direction. The magnetic field strength generated by the current flow path with a change in direction is less than the magnetic field strength generated by the circular current flow path in a single direction, which is conducive to reducing the overall magnetic field strength in the battery pack 10 and reducing the possibility of electromagnetic interference. In addition, the current on the flow path with a change in direction can be conducive to generating magnetic fields in different directions. There is a possibility of mutual cancellation and weakening between magnetic fields in different directions, which is also conducive to reducing the overall magnetic field strength in the battery pack 10 and reducing the possibility of electromagnetic interference.

[0106] In the embodiment of the present application, the first battery module 201 and the third battery module 203 can be installed in the same manner, and can be transported by using the same clamp. After the clamp is transported and installed on the first battery module 201, the clamp no longer needs to be rotated 180° when clamping the third battery module 203, and the third battery module 203 can be transported and installed using the same installation method, which is beneficial to improving production efficiency and reducing the difficulty of clamp structure design.

[0107] In some possible implementations, see Figure 4 As shown, the first electrode 20a of the third battery module 203 is connected to the second electrode 20b of the fourth battery module 204. Four battery modules 20 can be provided in the battery pack 10. The four battery modules 20 are respectively used as the first battery module 201, the second battery module 202, the third battery module 203 and the fourth battery module 204. The first battery module 201 is connected in series with the fourth battery module 204. The fourth battery module 204 is connected in series with the third battery module 203. The third battery module 203 is connected in series with the second battery module 202. The first electrode 20a of the first battery module 201 serves as the first total electrode of the four battery modules 20. The second electrode 20b of the second battery module 202 serves as the second total electrode of the four battery modules 20.

[0108] In some possible implementations, see Figure 3 and Figure 5 As shown, the battery module 20 includes at least one circuit board 21. At least one of the positive terminal 222a and the negative terminal 222b of each battery cell 22 is connected to the circuit board 21. The circuit board 21 is configured to collect parameters of the battery cell 22.

[0109] The battery management system can monitor the operating status of the battery cell 22 through the circuit board 21. For example, when the circuit board 21 collects the parameters of the battery cell 22 to indicate that the battery cell 22 has the possibility of thermal runaway, the battery management system can control the battery pack 10 to power off or perform firefighting cooling and fire extinguishing treatment on the battery cell 22 to reduce the possibility of safety hazards in the battery pack 10 and improve the safety of the battery pack 10.

[0110] In some examples, the electrode terminal 222 of each battery cell 22 is welded to the circuit board 21 .

[0111] In some examples, the circuit board 21 is configured to collect parameters such as voltage and temperature of the battery cell 22 .

[0112] In some examples, the circuit board 21 may be a printed circuit board 21 (PCB) or a flexible printed circuit board 21 (FPCB).

[0113] For some examples, see Figure 3 and Figure 5 As shown, the circuit board 21 can be an integral structure, so that the positive terminal 222a and the negative terminal 222b of each battery cell 22 can be connected to the circuit board 21. The circuit board 21 may include a first sub-circuit board 21a and a second sub-circuit board 21b. The first sub-circuit board 21a and the second sub-circuit board 21b are independently arranged. In a battery module 20, the electrode terminals 222 of a part of the battery cells 22 can be connected to the first sub-circuit board 21a, and the electrode terminals 222 of the remaining number of battery cells 22 can be connected to the second sub-circuit board 21b.

[0114] In some examples, the positive terminal 222a and the negative terminal 222b may be located on the same side of the main body 221. Accordingly, a circuit board 21 is disposed on one side of one battery module 20.

[0115] In some achievable ways, a circuit board 21 of the first battery module 201 is located between the main body 221 of the first battery module 201 and the main body 221 of the second battery module 202, and the circuit board 21 faces the second battery module 202 along the second direction Y. A circuit board 21 of the second battery module 202 is located between the main body 221 of the first battery module 201 and the main body 221 of the second battery module 202, and the circuit board 21 faces the second battery module 202 along the direction opposite to the second direction Y. The circuit board 21 can reuse the space between the main body 221 of the first battery module 201 and the main body 221 of the second battery module 202, so as to improve the space utilization. The first battery module 201 and the second battery module 202 can protect the circuit board 21, and reduce the possibility of structural damage and failure of the circuit board 21 due to collision.

[0116] In some achievable ways, a circuit board 21 of the third battery module 203 group 20 is located between the main body 221 of the third battery module 203 and the main body 221 of the fourth battery module 204, and the circuit board 21 faces the fourth battery module 204 along the second direction Y. A circuit board 21 of the fourth battery module 204 is located between the main body 221 of the third battery module 203 and the main body 221 of the fourth battery module 204, and the circuit board 21 faces the third battery module 203 along the direction opposite to the second direction Y. The circuit board 21 can reuse the space between the main body 221 of the third battery module 203 and the main body 221 of the fourth battery module 204, so as to improve the space utilization. The third battery module 203 and the fourth battery module 204 can protect the circuit board 21, and reduce the possibility of structural damage and failure of the circuit board 21 due to collision.

[0117] In some achievable ways, Figure 7 The partial structure of the battery pack 10 is schematically shown. Figure 2 , Figure 3 and Figure 7 As shown, the circuit board 21 includes a wireless communication module 211. The battery pack 10 includes a housing 30, a battery management circuit board 40 and an antenna 50. Multiple battery modules 20 are arranged in the housing 30, and the battery management circuit board 40 is arranged outside the housing 30. The antenna 50 is arranged on the battery management circuit board 40. The wireless communication module 211 is communicatively connected with the antenna 50. Wireless communication can be achieved between the wireless communication module 211 and the antenna 50. The parameters collected by the circuit board 21 at the battery module 20 can be sent through the wireless communication module 211. The wireless communication module 211 can send relevant signals to the antenna 50 in a wireless manner. The antenna 50 can send the received signal to the battery management circuit board 40 arranged outside the housing 30.

[0118] The method of wireless communication between the wireless communication module 211 and the antenna 50, on the one hand, reduces the number of connecting wires between the battery management circuit board 40 and the circuit board 21 at the battery module 20, reduces the difficulty of wiring and installation, and saves space in the shell 30; on the other hand, the setting position of the circuit board 21 at the battery module 20 is relatively flexible and free, and is no longer restricted by the connecting wires.

[0119] In some examples, the wireless communication module 211 may include a wireless local area network (WLAN) module or a Bluetooth (BT) module. For example, the wireless local area network module may include a wireless fidelity (Wi-Fi) module.

[0120] The wireless communication module 211 and the antenna 50 are both magnetic field sensitive devices. In the case of electromagnetic interference with a relatively large magnetic field strength in the surrounding environment of the wireless communication module 211 and the antenna 50, the wireless signal interaction process between the wireless communication module 211 and the antenna 50 will be affected, generating signal noise, which is not conducive to maintaining good signal clarity between the wireless communication module 211 and the antenna 50, thereby affecting the monitoring performance of the battery management system on the battery cell 22.

[0121] In some achievable embodiments, the material of the housing 30 includes a metal material. The housing 30 is provided with an opening 301. The antenna 50 is provided through the opening 301. At least a portion of the antenna 50 can extend into the housing 30, which is beneficial to reducing the shielding effect of the housing 30 on the signal, and is beneficial to ensuring smooth and continuous communication between the wireless communication module 211 and the antenna 50, so as to improve the safety of the battery pack 10.

[0122] In some examples, the material of the housing 30 includes, but is not limited to, aluminum, aluminum alloy, and steel.

[0123] In some examples, the housing 30 includes a receiving recess having an opening. The battery module 20 is disposed in the recess of the housing 30. The battery pack 10 includes a cover plate 60 (see Figure 2 As shown in FIG. 1 ). The cover plate 60 can open or close the opening of the housing 30. The cover plate 60 is sealed and connected to the housing 30 to form a box with a sealed space. Exemplarily, the cover plate 60 is detachably connected to the housing 30. A sealing ring is provided between the cover plate 60 and the housing 30 or the cover plate 60 and the housing 30 are bonded by glue.

[0124] Exemplarily, the housing 30 includes a bottom plate and four side plates. The four side plates are connected end to end in sequence. The four side plates are all connected to the bottom plate. The bottom plate and the four side plates enclose a receiving recess having an opening. The cover plate 60 can be sealed and connected to the four side plates. An opening 301 is provided on one of the four side plates. For example, along the first direction X, an opening 301 is provided on one of the two opposite side plates.

[0125] For some examples, see Figure 2 and Figure 7 As shown, the battery pack 10 includes a protective cover 300. The protective cover 300 is connected to the housing 30. The battery management circuit board 40 is disposed between the protective cover 300 and the housing 30. The protective cover 300 can protect the battery management circuit board 40 and reduce the possibility of structural damage caused by collision of the battery management circuit board 40. Exemplarily, the protective cover 300 is detachably connected to the housing 30.

[0126] In some examples, the antenna 50 passes through the opening 301 of the housing 30 . The opening 301 is filled with sealant to seal the gap between the housing 30 and the antenna 50 , thereby strengthening the sealing of the battery pack 10 .

[0127] Figure 8 A partial structure of the battery pack 10 is schematically shown. Fig. 9 yes Figure 8 Enlarged view of point M in the middle. Fig.10 A partial structure of the battery pack 10 is schematically shown. Fig.11 yes Fig.10 Enlarged view of R in the middle.

[0128] In some possible implementations, see Figure 2 , Figure 8 , Fig. 9 and Fig.11As shown, the battery pack 10 includes a first metal cooling plate 70. Each battery module 20 is connected to the first metal cooling plate 70. Along the third direction Z, the first battery module 201 and the second battery module 202 are located on the same side of the first metal cooling plate 70, and the third battery module 203 and the fourth battery module 204 are located on the other side of the first metal cooling plate 70. The third direction Z is the same as the thickness direction of the first metal cooling plate 70.

[0129] The battery module 20 generates heat during operation. The first metal cooling plate 70 can exchange heat with the battery module 20 to remove the heat generated by the battery module 20, thereby cooling the battery module 20 and enhancing the heat dissipation of the battery module 20.

[0130] The first metal cooling plate 70 may support the first battery module 201 and the second battery module 202 .

[0131] The first metal cooling plate 70 separates the first battery module 201 from the third battery module 203. At the same time, the first metal cooling plate 70 also separates the second battery module 202 from the fourth battery module 204. The first metal cooling plate 70 can simultaneously perform heat exchange with the first battery module 201, the second battery module 202, the third battery module 203 and the fourth battery module 204, which is beneficial to improve the heat dissipation efficiency.

[0132] In some examples, the battery pack 10 includes a thermally conductive adhesive 400 (see Figure 2 As shown). Each battery module 20 and the first metal cooling plate 70 are bonded by a thermally conductive adhesive 400 to further improve the heat dissipation efficiency. Exemplarily, the thermally conductive adhesive 400 may be thermally conductive silica gel. Optionally, at 25°C, the thermal conductivity of the thermally conductive adhesive 400 is 0.8W / (m·K) to 3.0W / (m·K).

[0133] In some examples, the material of the first metal cooling plate 70 is, but is not limited to, aluminum or aluminum alloy. The cooling medium transported in the first metal cooling plate 70 may include, but is not limited to, water and perfluorohexanone.

[0134] In some embodiments, the battery pack 10 includes a first electrical connector 80. The first electrical connector 80 connects the second electrode 20b of the first battery module 201 and the first electrode 20a of the fourth battery module 204. Fig. 9 and Fig.11 As shown, viewed along the third direction Z, along the first direction X, the first electrical connector 80 exceeds the first metal cooling plate 70 .

[0135] Generally, a complete coil is required for electric current to generate a magnetic field. The first metal cooling plate 70 is placed in the middle of the battery module 20 to destroy the coil, thereby isolating the magnetic field, reducing the possibility of electromagnetic interference, and improving the safety of the battery pack.

[0136] In some possible implementations, see Figure 2 , Figure 8 and Fig. 9 As shown, each battery module 20 includes two end walls 23. A plurality of battery cells 22 are located between the two end walls 23. Along the first direction X, at least a portion of the first electrical connector 80 is disposed on a side of an end wall 23 of the first battery module 201 away from the battery cells 22. The two end walls 23 can limit and protect the plurality of battery cells 22. The plurality of battery cells 22 can be protected by the two end walls 23, which is conducive to reducing the possibility of damage caused by collision of the battery cells 22.

[0137] See also Fig. 9 As shown, part of the first electrical connector 80 is disposed on a side of an end wall 23 of the first battery module 201 away from the battery cell 22 , and part of the first electrical connector 80 is disposed on a side of an end wall 23 of the third battery module 203 away from the battery cell 22 .

[0138] In some examples, when viewed along the third direction Z, along the first direction X, see Fig.10 and Fig.11 , the end wall 23 of the first battery module 201 and the first electrical connector 80 both extend beyond the first metal cooling plate 70 .

[0139] In some examples, the material of the end wall 23 may be a metal material. An insulating plate 500 may be disposed between the first electrical connector 80 and the end wall 23. The insulating plate 500 insulates and isolates the first electrical connector 80 from the end wall 23. The material of the end wall 23 may include, but is not limited to, aluminum and aluminum alloy.

[0140] For some examples, see Fig. 9 As shown, the first electrical connector 80 includes a first conductive sheet 81, a first bus bar 82 and a first conductive wire bundle 83. The first bus bar 82 connects the first conductive sheet 81 and the first conductive wire bundle 83. The first bus bar 82 is disposed on a side of an end wall 23 of the first battery module 201 away from the battery cell 22, and the first conductive sheet 81 connects the second electrode 20b of the first battery module 201 and the first bus bar 82. The first conductive wire bundle 83 connects the first electrode 20a of the fourth battery module 204 and the first bus bar 82.

[0141] See also Fig. 9As shown, part of the first busbar 82 is disposed on a side of one end wall 23 of the first battery module 201 away from the battery cell 22, and the remaining part of the first busbar 82 is disposed on a side of one end wall 23 of the third battery module 203 away from the battery cell 22, which is beneficial to shorten the connection path between the first battery module 201 and the fourth battery module 204. In other examples, the first busbar 82 may be entirely disposed on a side of one end wall 23 of the first battery module 201 away from the battery cell 22.

[0142] The first conductive sheet 81 and the first bus bar 82 have good current carrying capacity. The first conductive wire bundle 83 itself has good flexibility, and can be bent and deformed relatively easily to bypass obstacles, which is conducive to reducing the difficulty of the connection operation between the first electrode 20a of the fourth battery module 204 and the first bus bar 82.

[0143] In some examples, the material of the first conductive sheet 81 includes, but is not limited to, copper and copper alloy. The material of the first bus bar 82 includes, but is not limited to, copper and copper alloy.

[0144] In some examples, an insulating plate 500 may be disposed between the first busbar 82 and the end wall 23. The first busbar 82 is disposed on a side of the end wall 23 away from the battery cells 22. The first busbar 82 may be detachably connected to the end wall 23 by fasteners such as screws.

[0145] In some possible implementations, see Fig. 9 As shown, the battery pack 10 includes a second electrical connector 90. The second electrical connector 90 connects the first electrode 20a of the second battery module 202 and the second electrode 20b of the third battery module 203. Fig. 9 and Fig.11 As shown, viewed along the third direction Z, along the first direction X, the second electrical connector 90 exceeds the first metal cooling plate 70 .

[0146] For some examples, see Figure 2 , Figure 8 and Fig. 9 As shown, each battery module 20 includes a battery cell 22 and two end walls 23. A plurality of battery cells 22 are located between the two end walls 23. Along the first direction X, at least a portion of the second electrical connector 90 is disposed on a side of an end wall 23 of the second battery module 202 away from the battery cell 22. The two end walls 23 can limit and protect the plurality of battery cells 22. The plurality of battery cells 22 can be protected by the two end walls 23, which is conducive to reducing the possibility of damage caused by collision of the battery cells 22.

[0147] See also Fig. 9As shown, part of the second electrical connector 90 is disposed on a side of an end wall 23 of the second battery module 202 away from the battery cell 22 , and part of the second electrical connector 90 is disposed on a side of an end wall 23 of the fourth battery module 204 away from the battery cell 22 .

[0148] In some examples, when viewed along the third direction Z, along the first direction X, see Fig.10 and Fig.11 , the end wall 23 of the second battery module 202 and the second electrical connector 90 both extend beyond the first metal cooling plate 70 .

[0149] In some examples, the material of the end wall 23 may be a metal material. An insulating plate 500 may be disposed between the second electrical connector 90 and the end wall 23. The insulating plate 500 insulates and isolates the second electrical connector 90 from the end wall 23.

[0150] For some examples, see Fig. 9 and Fig.11 As shown, the second electrical connector 90 includes a second conductive sheet 91, a second bus bar 92, and a second conductive wire bundle 93. The second bus bar 92 connects the second conductive sheet 91 and the second conductive wire bundle 93. The second bus bar 92 is disposed on a side of an end wall 23 of the second battery module 202 away from the battery cell 22. The second conductive sheet 91 connects the first electrode 20a of the second battery module 202 and the second bus bar 92. The second conductive wire bundle 93 connects the second electrode 20b of the third battery module 203 and the second bus bar 92.

[0151] See also Fig. 9 As shown, part of the second bus bar 92 is disposed on a side of one end wall 23 of the second battery module 202 away from the battery cell 22, and the remaining part of the second bus bar 92 is disposed on a side of one end wall 23 of the fourth battery module 204 away from the battery cell 22, which is beneficial to shorten the connection path between the second battery module 202 and the third battery module 203. In other examples, the second bus bar 92 may be entirely disposed on a side of one end wall 23 of the second battery module 202 away from the battery cell 22.

[0152] The second conductive sheet 91 and the second bus bar 92 have good current carrying capacity. The second conductive wire bundle 93 itself has good flexibility, and can be bent and deformed relatively easily to bypass obstacles, which is conducive to reducing the difficulty of connecting the second electrode 20b of the third battery module 203 and the second bus bar 92.

[0153] In some examples, the material of the second conductive sheet 91 includes, but is not limited to, copper and copper alloy. The material of the second bus bar 92 includes, but is not limited to, copper and copper alloy.

[0154] In some examples, an insulating plate 500 may be disposed between the second busbar 92 and the end wall 23. The second busbar 92 is disposed on a side of the end wall 23 away from the battery cells 22. The second busbar 92 may be detachably connected to the end wall 23 by fasteners such as screws.

[0155] In some examples, Fig.12 A partial structure of the battery pack 10 is schematically shown. Fig.13 yes Fig.12 Enlarged view of the middle W. Fig.14 yes Fig.10 Enlarged view of P in the middle. Fig.12 , Fig.13 and Fig.14 As shown, the battery pack 10 includes a third electrical connector 100. The third electrical connector 100 connects the first electrode 20a of the third battery module 203 and the second electrode 20b of the fourth battery module 204. Fig.14 As shown, viewed along the third direction Z, along the first direction X, the third electrical connector 100 exceeds the first metal cooling plate 70 .

[0156] In some examples, the third electrical connector 100 can be detachably connected to the end wall 23 by fasteners such as screws. The material of the end wall 23 can be a metal material. An insulating plate 500 can be arranged between the third electrical connector 100 and the end wall 23. The insulating plate 500 insulates and isolates the third electrical connector 100 from the end wall 23.

[0157] In some implementations, the battery pack 10 includes a fourth electrical connector 110. The fourth electrical connector 110 is connected to the first electrode 20a of the first battery module 201. Fig.10 and Fig.14 , viewed along the third direction Z, along the first direction X, the fourth electrical connector 110 extends beyond the first metal cooling plate 70 .

[0158] The first electrode 20a of the first battery module 201 is the first common electrode of the plurality of battery modules 20. The first common electrodes of the plurality of battery modules 20 can be led out through the fourth electrical connector 110, so that the battery pack 10 as a whole can be connected to other electrical devices through the fourth electrical connector 110.

[0159] In some examples, the fourth electrical connector 110 may be connected to the battery management circuit board 40. The fourth electrical connector 110 may include a connection harness 600. The connection harness 600 is electrically connected to the first electrode 20a of the first battery module 201. The connection harness 600 itself has good flexibility, and the connection harness 600 can be bent and deformed relatively easily to bypass obstacles, which is conducive to reducing the difficulty of the connection operation between the fourth electrical connector 110 and the first electrode 20a of the first battery module 201.

[0160] In some embodiments, the battery pack 10 includes a fifth electrical connector 120. The fifth electrical connector 120 is electrically connected to the second electrode 20b of the second battery module 202. Fig.10 and Fig.14 , viewed along the third direction Z, along the first direction X, the fifth electrical connector 120 extends beyond the first metal cooling plate 70 .

[0161] The second electrode 20b of the second battery module 202 is the second total electrode of the plurality of battery modules 20. The second total electrodes of the plurality of battery modules 20 can be led out through the fifth electrical connector 120, so that the battery pack 10 as a whole can be connected to other electrical devices through the fifth electrical connector 120.

[0162] In some examples, the fifth electrical connector 120 may be connected to the battery management circuit board 40. The fifth electrical connector 120 may include a connection harness 600. The connection harness 600 is electrically connected to the second electrode 20b of the second battery module 202. The connection harness 600 itself has good flexibility, and the connection harness 600 can be bent and deformed relatively easily to avoid obstacles, which is conducive to reducing the difficulty of the connection operation between the fifth electrical connector 120 and the second electrode 20b of the second battery module 202.

[0163] In some examples, the first and second main electrodes of the battery pack 10 are located on the same side of the battery pack 10. The fourth and fifth electrical connectors 110 and 120 are led out from the same side of the battery pack 10.

[0164] Along the second direction Y, the first electrode 20a of the first battery module 201 and the second electrode 20b of the second battery module 202 are arranged opposite to each other, so that the first main electrode of the battery pack 10 is arranged opposite to the second main electrode. The first main electrode of the battery pack 10 and the second main electrode are arranged opposite to each other so that the first main electrode and the second main electrode of the battery pack 10 are located on the same side. If the first main electrode and the second main electrode are arranged at intervals along the first direction X, one of the first main electrode and the second main electrode needs to be led to the same side using an additional longer connecting wire. In the battery pack 10 of the embodiment of the present application, since the first main electrode and the second main electrode are located on the same side, it is beneficial to reduce the number of components used and reduce the difficulty of assembly.

[0165] In some achievable ways, Fig.15 The partially simplified structure of the battery pack 10 is schematically shown. Fig.15As shown, the plurality of battery modules 20 include a fifth battery module 205 and a sixth battery module 206. The fifth battery module 205 and the third battery module 203 are arranged in a third direction Z. The first electrode 20a and the second electrode 20b of the fifth battery module 205 are arranged at intervals along the first direction X. The fifth battery module 205 and the sixth battery module 206 are arranged in a second direction Y. The sixth battery module 206 and the fourth battery module 204 are arranged in a third direction Z. The second electrode 20b and the first electrode 20a of the sixth battery module 206 are arranged at intervals along the first direction X. The second electrode 20b of the fourth battery module 204 is connected to the first electrode 20a of the fifth battery module 205. The second electrode 20b of the sixth battery module 206 is connected to the first electrode 20a of the third battery module 203. The second electrode 20b of the fifth battery module 205 is connected to the first electrode 20a of the sixth battery module 206.

[0166] In some examples, the battery pack 10 includes a second metal cooling plate 160. Along the third direction Z, the third battery module 203 and the fourth battery module 204 are located on the same side of the second metal cooling plate 160, and the fifth battery module 205 and the sixth battery module 20 are located on the other side of the second metal cooling plate 160. The third battery module 203 and the fourth battery module 204 are located between the first metal cooling plate 70 and the second metal cooling plate 160. The third direction Z is the same as the thickness direction of the second metal cooling plate 160.

[0167] The battery module 20 generates heat during operation. The first metal cooling plate 70 and the second metal cooling plate 160 can exchange heat with the battery module 20 to remove the heat generated by the battery module 20 and cool the battery module 20 .

[0168] The second metal cooling plate 160 may support the third battery module 203 and the fourth battery module 204 .

[0169] The second metal cooling plate 160 separates the third battery module 203 from the fifth battery module 205. At the same time, the second metal cooling plate 160 also separates the fourth battery module 204 from the sixth battery module 206. The second metal cooling plate 160 can simultaneously perform heat exchange with the third battery module 203, the fourth battery module 204, the fifth battery module 205, and the sixth battery module 206, which is beneficial to improve heat dissipation efficiency.

[0170] In some examples, the third battery module 203, the fourth battery module 204, the fifth battery module 205 and the sixth battery module are each bonded to the second metal cooling plate 160 by a thermally conductive adhesive 400. For example, the thermally conductive adhesive 400 may be thermally conductive silicone.

[0171] In some examples, the material of the second metal cooling plate 160 includes, but is not limited to, aluminum or aluminum alloy. The cooling medium transported in the second metal cooling plate 160 may include, but is not limited to, water and perfluorohexanone.

[0172] In some examples, the battery pack 10 includes a sixth electrical connector 130. The sixth electrical connector 130 connects the second electrode 20b of the fourth battery module 204 and the first electrode 20a of the fifth battery module 205. Exemplarily, the structure of the sixth electrical connector 130 may be the same as that of the first electrical connector 80. For details, please refer to the description of the first electrical connector 80, which will not be repeated here.

[0173] In some examples, the battery pack 10 includes a seventh electrical connector 140. The seventh electrical connector 140 connects the second electrode 20b of the sixth battery module 206 and the first electrode 20a of the third battery module 203. Exemplarily, the structure of the seventh electrical connector 140 may be the same as that of the second electrical connector 90. For details, please refer to the description of the second electrical connector 90, which will not be repeated here.

[0174] In some examples, the battery pack 10 includes an eighth electrical connector 150. The eighth electrical connector 150 connects the second electrode 20b of the fifth battery module 205 and the first electrode 20a of the sixth battery module 206. Exemplarily, the structure of the eighth electrical connector 150 may be the same as that of the third electrical connector 100. For details, please refer to the description of the third electrical connector 100, which will not be repeated here.

[0175] According to some embodiments of the present application, an energy storage device is further provided, comprising a battery pack 10 according to any of the above schemes, and the battery pack 10 is used to provide electrical energy to the energy storage device.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery pack, characterized in that: include: A plurality of battery modules, each of the battery modules comprising a first electrode and a second electrode with opposite polarities, the first electrode and the second electrode of the same battery module being located on the same side of the battery module; The plurality of battery modules include: A first battery module, wherein a first electrode and a second electrode of the first battery module are spaced apart along a first direction; a second battery module, wherein the first battery module and the second battery module are arranged in a second direction, and the second electrode and the first electrode of the second battery module are arranged at intervals along the first direction; A third battery module is arranged along a third direction with the first battery module, and a first electrode and a second electrode of the third battery module are arranged at intervals along the first direction; a fourth battery module, wherein the third battery module and the fourth battery module are arranged along the second direction, the fourth battery module and the second battery module are arranged along the third direction, and the second electrode and the first electrode of the fourth battery module are arranged at intervals along the first direction; The second electrode of the first battery module is connected to the first electrode of the fourth battery module, and the first electrode of the second battery module is connected to the second electrode of the third battery module. The first electrode of the first battery module is a first total electrode of the plurality of battery modules, and the second electrode of the second battery module is a second total electrode of the plurality of battery modules.

2. The battery pack according to claim 1, characterized in that: The first electrode of the third battery module is connected to the second electrode of the fourth battery module.

3. The battery pack according to claim 1, characterized in that: The plurality of battery modules include: a fifth battery module, arranged along the third direction with the third battery module, wherein the first electrode and the second electrode of the fifth battery module are arranged at intervals along the first direction; a sixth battery module, wherein the fifth battery module and the sixth battery module are arranged along the second direction, the sixth battery module and the fourth battery module are arranged along the third direction, and the second electrode and the first electrode of the sixth battery module are arranged at intervals along the first direction; The second electrode of the fourth battery module is connected to the first electrode of the fifth battery module, the second electrode of the sixth battery module is connected to the first electrode of the third battery module, and the second electrode of the fifth battery module is connected to the first electrode of the sixth battery module.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The battery module includes at least one circuit board and a plurality of battery cells, each of the battery cells includes a main body and an electrode terminal, the electrode terminal of each battery cell is connected to the circuit board, and the circuit board is configured to collect parameters of the battery cells.

5. The battery pack according to claim 4, characterized in that: A circuit board of the first battery module is located between the main body of the first battery module and the main body of the second battery module, and a circuit board of the second battery module is located between the main body of the first battery module and the main body of the second battery module.

6. The battery pack according to claim 4 or 5, characterized in that: A circuit board of the third battery module is located between the main body of the third battery module and the main body of the fourth battery module, and a circuit board of the fourth battery module is located between the main body of the third battery module and the main body of the fourth battery module.

7. The battery pack according to any one of claims 4 to 6, characterized in that: The circuit board includes a wireless communication module, the battery pack includes a shell, a battery management circuit board and an antenna, the multiple battery modules are arranged in the shell, the battery management circuit board is arranged outside the shell, the antenna is arranged on the battery management circuit board, and the wireless communication module is communicatively connected to the antenna.

8. The battery pack according to claim 7, characterized in that: The material of the shell includes metal material. The shell is provided with an opening. The antenna extends into the shell through the opening.

9. The battery pack according to claim 7, characterized in that: The battery pack includes a cover plate, and the cover plate is sealed and connected to the shell.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The battery pack includes a first metal cooling plate, and each of the battery modules is connected to the first metal cooling plate; Along the third direction, the first battery module and the second battery module are located on the same side of the first metal cooling plate, and the third battery module and the fourth battery module are located on the other side of the first metal cooling plate.

11. The battery pack according to claim 10, characterized in that: The battery pack includes a first electrical connector, the first electrical connector connecting the second electrode of the first battery module and the first electrode of the fourth battery module, When viewed along the third direction, along the first direction, the first electrical connector exceeds the first metal cooling plate.

12. The battery pack according to claim 11, characterized in that: Each of the battery modules includes a plurality of battery cells and two end walls, wherein the plurality of battery cells are located between the two end walls; along the first direction, at least a portion of the first electrical connector is disposed on a side of an end wall of the first battery module away from the battery cells.

13. The battery pack according to claim 12, characterized in that: The first electrical connector includes a first conductive sheet, a first bus bar and a first conductive wire harness, wherein the first bus bar is disposed on a side of an end wall of the first battery module away from the battery cell; The first conductive sheet connects the second electrode of the first battery module and the first bus bar, and the first conductive wire bundle connects the first electrode of the fourth battery module and the first bus bar.

14. The battery pack according to any one of claims 10 to 13, characterized in that: The battery pack includes a second electrical connector, the second electrical connector connecting the first electrode of the second battery module and the second electrode of the third battery module, When viewed along the third direction, along the first direction, the second electrical connector exceeds the first metal cooling plate.

15. The battery pack according to claim 14, characterized in that: Each of the battery modules includes a plurality of battery cells and two end walls, wherein the plurality of battery cells are located between the two end walls, and along the first direction, at least a portion of the second electrical connector is disposed on a side of an end wall of the second battery module away from the battery cells.

16. The battery pack according to claim 15, characterized in that: The second electrical connector includes a second conductive sheet, a second bus bar and a second conductive wire harness, wherein the second bus bar is disposed on a side of an end wall of the second battery module away from the battery cell. The second conductive sheet connects the first electrode of the second battery module and the second bus bar, and the second conductive wire harness connects the second electrode of the third battery module and the second bus bar.

17. The battery pack according to any one of claims 10 to 16, characterized in that: The battery pack includes a third electrical connector, which connects the first electrode of the third battery module and the second electrode of the fourth battery module. When viewed along the third direction, the third electrical connector extends beyond the first metal cooling plate along the first direction.

18. The battery pack according to any one of claims 10 to 17, characterized in that: The battery pack includes a fourth electrical connector, the fourth electrical connector is connected to the first electrode of the first battery module, and when viewed along the third direction, the fourth electrical connector extends beyond the first metal cooling plate along the first direction; and / or, The battery pack includes a fifth electrical connector connected to the second electrode of the second battery module. When viewed along the third direction, the fifth electrical connector extends beyond the first metal cooling plate along the first direction.

19. The battery pack according to any one of claims 1 to 18, characterized in that: The first electrode and the second electrode of the first battery module face the second battery module, and the second electrode and the first electrode of the second battery module face the first battery module; The first electrode and the second electrode of the third battery module face the fourth battery module, and the second electrode and the first electrode of the fourth battery module face the third battery module.

20. An energy storage device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 19.

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