Battery pack

Abstract

To solve the problem in which, at present, the number of electrical connection structural parts of a power battery module is large and the structure is complex, which increases the overall size, manufacturing cost and assembly cost of the module, resulting in relatively high production and assembly costs.SOLUTION: A battery pack is provided. The battery pack includes a battery module, and a battery management assembly connected to the battery module. The battery management assembly includes a printed circuit board, a positive busbar, a negative busbar, and a flexible circuit board. One end of the positive busbar and one end of the negative busbar are connected to the battery module. The other end of the positive busbar and the other end of the negative busbar are connected to the printed circuit board. The flexible circuit board is connected to the positive busbar, the negative busbar, the battery module and the printed circuit board.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to battery packs.

[0002] This application claims the priority of a Chinese patent application with application number 202420536890.7 filed with the Chinese Patent Office on March 19, 2024, and all the contents of this application are incorporated herein by reference.

Background Art

[0003] As the requirements for the energy density of automotive batteries increase, battery pack technology must also be continuously optimized. The market is also raising new requirements for the manufacturing cost, process reliability, and process ease of lithium batteries.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Currently, due to the large number of components and complex structure related to the electrical connection structure of power battery modules, the dimensions, manufacturing costs, and assembly costs of the entire module increase, resulting in relatively high production and assembly costs.

Means for Solving the Problems

[0005] This application provides a battery pack, which includes a battery module, and a battery management assembly connected to the battery module, The battery management assembly includes a printed circuit board, a positive bus bar, a negative bus bar, and a flexible circuit board.

[0006] Here, one end of the positive bus bar and one end of the negative bus bar are connected to the battery module, the other end of the positive bus bar and the other end of the negative bus bar are connected to the printed circuit board, and the flexible circuit board is connected to the positive bus bar, the negative bus bar, the battery module, and the printed circuit board respectively. [Effects of the Invention]

[0007] The battery pack provided in this application includes a battery module and a battery management assembly, the battery management assembly being connected to the battery module, and the battery management assembly including a printed circuit board, a positive busbar, a negative busbar, and a flexible circuit board. Here, one end of the positive busbar and one end of the negative busbar are connected to the battery module, the other end of the positive busbar and the other end of the negative busbar are connected to the printed circuit board, and the flexible circuit board is connected to the positive busbar, the negative busbar, the battery module, and the printed circuit board, respectively. As a result, elements such as transfer connectors, transfer copper bars, bolts and nuts are omitted, significantly reducing the production and assembly costs of the battery pack, lowering costs and simplifying the assembly process. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing a battery pack provided in some embodiments of the present application. [Figure 2] This is an exploded view showing a battery pack provided in some embodiments of the present application. [Figure 3] This is an exploded plan view showing a battery pack provided in some embodiments of the present application. [Figure 4A] This is a schematic diagram showing the top cover provided in some embodiments of the present application. [Figure 4B] This is a schematic diagram showing the top cover provided in some embodiments of the present application. [Figure 5] This is a schematic diagram showing a lower cover provided in some embodiments of the present application. [Figure 6] This is a schematic diagram showing a plastic bracket provided in some embodiments of the present application. [Modes for carrying out the invention]

[0009] In the description of this application, unless otherwise explicitly stated and limited, the terms “communication,” “connection,” and “fixed” shall be understood in a broad sense. For example, a fixed connection may be a detachable connection, a one-piece connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, internal communication between two elements, or interaction between two elements. Those skilled in the art may understand the specific meaning of the above terms in this application in particular contexts.

[0010] In this application, unless otherwise explicitly stated or limited, the presence of a first feature "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or it may include the first feature not being in direct contact with the second feature but being in contact with it by other features between them. Furthermore, the presence of a first feature "above," "above," or "on the top surface" of a second feature may include the first feature being directly above or diagonally above the second feature, or it may simply indicate that the first feature is higher than the second feature in the horizontal direction. The presence of a first feature "below," "below," or "on the bottom surface" of a second feature may include the first feature being directly below or diagonally below the second feature, or it may simply indicate that the first feature is lower than the second feature in the horizontal direction.

[0011] In the description of this embodiment, terms relating to orientation or positional relationships such as "up," "down," and "right" are based on the orientation or positional relationships shown in the drawings and are merely for the purpose of simplifying explanation and operation. They do not indicate or suggest any device or element having a specific orientation, configuration, or operation, and should not be interpreted as limiting this application. Furthermore, "first" and "second" are merely for distinction in the description and do not have any special meaning.

[0012] In this application, reference numerals and / or reference letters may be repeated in various embodiments, but such repetition is for the purpose of simplification and clarification and does not in itself indicate relationships between the various embodiments and / or installations described.

[0013] The battery pack provided in this application will be described in detail below with reference to specific embodiments and drawings. In one embodiment, the battery pack includes, for example, a cylindrical battery.

[0014] Referring to Figures 1, 2, and 3, the present invention provides a battery pack 100, which is a battery pack 100, Battery module 40 and Includes a battery management assembly 20 connected to a battery module 40, The battery management assembly 20 includes a printed circuit board 201, a positive busbar 202, a negative busbar 203, and a flexible circuit board 204.

[0015] Here, one end of the positive busbar 202 and one end of the negative busbar 203 are connected to the battery module 40, the other end of the positive busbar 202 and the other end of the negative busbar 203 are connected to the printed circuit board 201, and the flexible circuit board 204 is connected to the positive busbar 202, the negative busbar 203, the battery module 40, and the printed circuit board 201, respectively.

[0016] Specifically, the printed circuit board 201 is, for example, a printed circuit board (PCB) that transmits current, voltage, or temperature signals and is used to read the current, voltage, and temperature of the battery module 40. The flexible circuit board 204 is, for example, a flexible printed circuit board (FPC) that is used to collect the voltage and temperature of the battery module 40.

[0017] In one embodiment, the printed circuit board 201 is further provided with a plurality of MOS switches, for example, for controlling the on / off state of the current output.

[0018] In related technologies, a transfer connector is further provided on a printed circuit board (PCB). The collection lines for collecting voltage and temperature are connected to the transfer connector and bus bars (positive and negative bus bars and series-parallel bus bars) to realize signal transmission and data reading. In related technologies, the collection lines and the transfer connector are connected by means of plugging and unplugging.

[0019] In an embodiment of the present application, the flexible circuit board 204 is welded to the positive bus bar 202, the negative bus bar 203, the battery module 40, and the printed circuit board 201 respectively. In one embodiment, the flexible circuit board 204 is further connected to a connection bus bar 50 (refer to the description below). The flexible circuit board 204 is used to collect the voltage and temperature of the battery module 40. The flexible circuit board 204 is directly connected to the printed circuit board 201, thereby omitting the transfer connector structure, reducing the production cost, simplifying the assembly process, and the welding of the flexible circuit board 204 to the printed circuit board 201 is more stable than the plugging and unplugging connection means in related technologies.

[0020] Furthermore, in related technologies, the positive bus bar and the negative bus bar are respectively connected to the printed circuit board by transfer copper bars, and the positive bus bar and the negative bus bar are connected to transfer copper bar bolts. In an embodiment of the present application, the positive bus bar 202 and the negative bus bar 203 are directly welded to the printed circuit board 201, thereby omitting components such as transfer copper bars, bolts, and nuts, reducing costs, and realizing the effect of simplifying the assembly process.

[0021] In one selectable embodiment of the present application, the battery pack 100 includes a plastic bracket 30 provided between the printed circuit board 201 and the battery module 40 along the first direction Y.

[0022] The battery module 40 includes a plurality of cells 401 arranged along a second direction X intersecting a first direction Y, each of which includes a positive and a negative electrode, with the positive electrode busbar 202 connected to the positive electrode of the first or last cell 401 arranged along the second direction X, and the negative electrode busbar 203 connected to the negative electrode of the first or last cell 401 arranged along the second direction X. Specifically, the plastic bracket 30 provided insulation and improved the strength of the battery pack 100.

[0023] In one selectable embodiment of the present invention, the plastic bracket 30 is further provided with a plurality of connecting busbars 50, the connecting busbars 50 connecting the positive terminal of one cell 401 to the negative terminal of the other cell 401, with the exception of the positive terminal of the cell 401 connected to the positive busbar 202 and the negative terminal of the cell 401 connected to the negative busbar 203.

[0024] Specifically, each cell 401 includes a positive electrode and a negative electrode, with the positive and negative electrodes located at both ends of the cell 401. The positive and negative electrodes of multiple cells 401 in the battery module 40 are arranged alternately along a second direction X. The positive and negative poles of each cell 401 are located at both ends of the cell 401. The positive busbar 202 is connected to the positive pole of the cell 401, and the negative busbar 203 is connected to the negative pole of the cell 401. The positive busbar 202 and the negative busbar 203 are located on the same side of the printed circuit board 201. Multiple positive poles and multiple negative poles not connected to the positive busbar 202 and the negative busbar 203 are connected by connecting busbars 50 to form a battery module, and multiple cells 401 form a current circuit with respect to each other via the connecting busbars 50.

[0025] In one embodiment, the number of cells 401 is, for example, four, and the positive and negative poles of the four cells 401 are arranged alternately along a second direction X, the positive busbar 202 is connected to the positive pole of the outermost cell 401 of the four cells 401, and the negative busbar 203 is connected to the negative pole of another outermost cell 401, and the positive busbar 202, the negative busbar 203, and the positive pole of the cell connected to the positive busbar 202 and the negative pole of the cell connected to the negative busbar 203 are all located on the same side, and the positive and negative poles of the two central cells 401 are connected to a single connecting busbar 50. Of the four cells 401, the negative pole at the end of the outermost cell 401 furthest from the positive busbar 202 is connected to the positive pole of the adjacent cell 401 by a connecting busbar 50, and the positive and negative poles of the other two cells 401 are connected by the connecting busbar 50 to form a current circuit. However, the means of connection to the connecting busbar 50 are not limited to this and depend specifically on the actual application.

[0026] In one embodiment, the positive electrode busbar 202, the negative electrode busbar 203, and the connecting busbar 50 are made of, for example, aluminum, but are not limited thereto, and are used to collect, gather, or transport current from the battery module 40.

[0027] In one embodiment, the printed circuit board 201 further integrates a diverter, and current is transported through the diverter to the first connection bar 1011 or the second connection bar 1012.

[0028] In one selectable embodiment of the present invention, the positive and negative electrodes of cell 401 are located at the same end of cell 401. The flexible circuit board 204 includes a first flexible circuit board 2041, which is connected to the positive busbar 202, the negative busbar 203, the battery module 40, and the printed circuit board 201, respectively.

[0029] Specifically, when the positive and negative terminals of cell 401 are located at the same end of cell 401, the positive and negative terminals of the first flexible circuit board 2041 and the multiple cells 401 are located on the same side, thereby facilitating the connection between the first flexible circuit board 2041 and the battery module 40.

[0030] In one other selectable embodiment of the present invention, the positive and negative electrodes of each of the multiple cells 401 are located at opposite ends of the cell 401. The flexible circuit board 204 includes a first flexible circuit board 2041 and a second flexible circuit board 2042, the first flexible circuit board 2041 being connected to a positive busbar 202, a negative busbar 203, a battery module 40, and a printed circuit board 201, respectively, and the second flexible circuit board 2042 being connected to a connecting busbar 50, a battery module 40, and a printed circuit board 201, respectively, the connection means being, for example, welding.

[0031] Here, the first flexible circuit board 2041, the positive busbar 202, and the negative busbar 203 are located on the same side of the printed circuit board 201, while the second flexible circuit board 2042 is located on the side of the printed circuit board 201 away from the first flexible circuit board 204.

[0032] Specifically, the second flexible circuit board 2042 is, for example, a flexible printed circuit (FPC), and is located on opposite sides of the printed circuit board 201, opposite to the first flexible circuit board 204. The second flexible circuit board 2042 is used to collect the voltage and temperature of the battery module 40.

[0033] Referring to Figures 4A and 4B, in one selectable embodiment of the present invention, the battery pack 100 is The housing 10 includes an upper cover 101 and a lower cover 102 provided along a first direction Y, the upper cover 101 and the lower cover 102 forming a single volume set cavity, and the battery module 40, battery management assembly 20 and plastic bracket 30 are provided within the volume set cavity along the first direction Y.

[0034] Specifically, the printed circuit board 201 is close to the top cover 101, the battery module 40 is close to the bottom cover 102, the plastic bracket 30 is located between the printed circuit board 201 and the battery module 40, and the housing 10 is made of, for example, plastic material, but is not limited to this.

[0035] Furthermore, the upper cover 101 and the lower cover 102 may be connected mechanically, for example. In one embodiment, the upper cover 101 and the lower cover 102 are connected by bolts, but are not limited to this, and the specific method will depend on the actual application.

[0036] Furthermore, a first connection bar 1011 and a second connection bar 1012 are provided on the side of the top cover 101 away from the battery module 40. The first connection bar 1011 and the second connection bar 1012 are, for example, attached to the top cover 101, and parts of the first connection bar 1011 and parts of the second connection bar 1012 are provided penetrating the top cover 101 and connected to the printed circuit board 201.

[0037] Specifically, the first connection bar 1011 is located above the positive bus bar 202 along the first direction Y, and the first connection bar 1011 forms a current circuit with the positive bus bar 202 by the printed circuit board 201 and, for example, outputs current to transport to an external device. The second connection bar 1012 is located above the negative bus bar 203 along the first direction Y, and the second connection bar 1012 forms a current circuit with the negative bus bar 203 by the printed circuit board 201.

[0038] Specifically, the first connection bar 1011 and the second connection bar 1012 are made of a metallic material, and in this embodiment, for example, they are made of copper, but are not limited to this, and the specific material depends on the actual application. The first connection bar 1011 and the second connection bar 1012 transport, for example, current, voltage, or temperature of the battery module 40. In one embodiment, the first connection bar 1011 and the second connection bar 1012 are located on the top cover 101, and a portion of them penetrates the top cover 101 and is welded to the printed circuit board 201 to form a path for transmitting current, and the current is transmitted from the positive bus bar 202 and the negative bus bar 203 to the first connection bar 1011 and the second connection bar 1012 and transmitted or communicated to an external device.

[0039] In one selectable embodiment of the present invention, the top cover 101 has a plurality of recessed mounting grooves 1016 on the side adjacent to the battery module 40, with a portion of the first connecting bar 1011 and a portion of the second connecting bar 1012 respectively located in the corresponding mounting grooves 1016 along the first direction Y, and the other portion of the first connecting bar 1011 and the other portion of the second connecting bar 1012 passing through the mounting grooves 1016 to connect to the printed circuit board 201.

[0040] Specifically, in this embodiment, the number of mounting grooves 1016 is, for example, two, but is not limited to this, and depends on the actual application. The mounting grooves 1016 are recessed along the first direction Y toward the side closer to the battery module 40, thereby facilitating the assembly of the first connecting bar 1011 and the second connecting bar 1012 and reducing the risk of damage to the first connecting bar 1011 and the second connecting bar 1012 during installation or transport.

[0041] In one selectable embodiment of the present invention, the top cover 101 further includes a first output stud 1013 and a second output stud 1014, the first output stud 1013 and the second output stud 1014 respectively located in corresponding mounting grooves 1016, the first output stud 1013 being connected to the side of a first connection bar 1011 away from the battery module 40, and the second output stud 1014 being connected to the side of a second connection bar 1012 away from the battery module 40.

[0042] In related technologies, the connecting bar is further connected to a transfer copper bar, the transfer copper bar is connected to an output stud, and the transfer copper bar is connected to a connecting bar bolt. On the other hand, in the embodiment of the present invention, the first connecting bar 1011 and the second connecting bar 1012 are directly connected to the first output stud 1013 and the second output stud 1014, thereby omitting the transfer copper bar. Furthermore, the first connecting bar 1011 and the second connecting bar 1012 are welded to the first output stud 1013 and the second output stud 1014, thereby omitting elements such as bolts and nuts, reducing costs and simplifying the assembly process.

[0043] Specifically, the first output stud 1013 and the second output stud 1014 serve as a locking connection, locking and connecting to an external vehicle or other device.

[0044] In one selectable embodiment of the present invention, the mounting groove 1016 has a mounting height along a first direction Y. A portion of the first connecting bar 1011 located within the mounting groove 1016 has a first array height in its cross section along the first direction Y after being connected to the first output stud 1013. A portion of the second connecting bar 1012 located within the mounting groove 1016 has a second array height in its cross section along the first direction Y after being connected to the second output stud 1014. The first and second array heights are less than or equal to the mounting height.

[0045] Specifically, the mounting groove 1016 has a mounting height on the side facing the battery module 40 along the first direction Y, and the two mounting grooves 1016 are configured to accommodate a first connecting bar 1011 and a first output stud 1013, and a second connecting bar 1012 and a second output stud 1014, respectively. The ends of the first output stud 1013 and / or the second output stud 1014 away from the battery module 40 are coplanar with the side of the top cover 101 away from the battery module 40, or the ends of the first output stud 1013 and / or the second output stud 1014 away from the battery module 40 are lower than the side of the top cover 101 away from the battery module 40, thereby reducing the risk of the first output stud 1013 and / or the second output stud 1014 falling over or being damaged during installation or transport.

[0046] In one selectable embodiment of the present invention, the top cover 101 further includes a communication connector 1015, the communication connector 1015 including a connection port 10151 and connection pins 10152, the connection port 10151 located on the side of the top cover 101 away from the battery module 40, and the connection pins 10152, partly located within the connection port 10151 to establish an electrical connection, for example, with an external communication connector, and the other part provided through the top cover 101 to connect to a printed circuit board 201.

[0047] Specifically, the number of connection pins 10152 is, for example, four, with some of the connection pins 10152 connected to an external communication connector and the other parts passing through the connection port 10151 and welded to the printed circuit board 201. In related technologies, there are usually two connectors, which are connected by an adapter wire harness, and both ends of the adapter wire harness have adapters that are connected to the connectors. In the embodiment of the present invention, the connection port 10151 is welded to the top cover 101, and the connection pins 10152 are provided within the connection port 10151 and connected to the printed circuit board 201, thereby eliminating elements such as the adapter wire harness, adapter, one transfer connector, and bolts and nuts used to secure the transfer connector in related technologies, thereby reducing costs and simplifying the assembly process.

[0048] In one selectable embodiment of the present invention, the top cover 101 is injection-molded integrally with the first connection bar 1011, the second connection bar 1012, the first output stud 1013, the second output stud 1014, and the communication connector 1015, which has the effect of reducing costs and facilitating the assembly of the battery pack.

[0049] In one selectable embodiment of the present invention, the printed circuit board 201 is provided parallel to the upper cover 101 and the lower cover 102, and the positive busbar 202, the negative busbar 203 and the flexible circuit board 204 extend from the edge of the printed circuit board 201 toward the volume set cavity along a first direction Y and are connected to the battery module 40, where the positive and negative electrodes of each of the multiple cells 401 are located at one end or opposite ends of the cell 401 along a third direction Z, thereby reducing the space in the first direction Y within the volume set cavity.

[0050] Specifically, the third direction Z is positioned perpendicular to the first direction Y and the second direction X, and the multiple cells 401 are arranged along the second direction X. The positive and negative poles of each of the multiple cells 401 are located at one end or opposite ends of the cell 401 along the third direction Z. This can be understood as the multiple cells 401 being arranged horizontally, thereby reducing the overall height of the battery pack. Depending on the positive and negative poles of the horizontally arranged multiple cells 401, the pole columns of the cells 401 are located on the sides, the flexible circuit board 204 extends from the sides and is connected to the battery module 40, thereby reducing the difficulty of assembling the flexible circuit board 204.

[0051] Referring to Figure 5, in one selectable embodiment of the present invention, the bottom cover 102 has a plurality of recessed mounting grooves 1021 on the side adjacent to the battery module 40, the plurality of mounting grooves 1021 are arranged along a second direction X, and the plurality of cells are provided in the mounting grooves 1021 along the second direction X.

[0052] Specifically, the lower cover 102 is provided with multiple housing plates, which surround each other to form a single cavity, and the lower cover 102 has multiple recessed mounting grooves 1021 on the side closest to the battery module 40, and these mounting grooves 1021 are also located within the cavity, with the cell 401 positioned within the cavity such that a portion of it is located within the mounting grooves 1021.

[0053] Furthermore, the lower cover 102 is provided with a connector socket, which is used, for example, to connect to an external device.

[0054] Referring to Figure 6, in one selectable embodiment of the present invention, the plastic bracket 30 further includes a plurality of fixing portions 301, which are arranged along a second direction X, and which are located on the side of the plastic bracket 30 facing the battery module 40, and which correspond one-to-one with a plurality of cells 401, and each of the plurality of fixing portions 301 is configured to surround and fix a portion of the cells 401.

[0055] Specifically, multiple fixing parts 301 are integrally molded with the plastic bracket 30. The number of mounting grooves 1021 and fixing parts 301 corresponds one-to-one with the number of cells 401. In one embodiment, the cell 401 is a cylindrical battery, and the mounting groove 1021 is recessed toward the side away from the battery module 40 to accommodate the cell 401, thereby preventing the cell 401 from shaking within the battery pack 100 and affecting the battery performance and safety of the battery pack 100. The fixing part 301 has a housing cavity on the side facing the battery module 40, and a portion of the cell 401 is located within the housing cavity. The side of the fixing part 301 facing the battery module 40 is, for example, arc-shaped, and the space formed from this arc is, for example, a housing cavity, and the center of this arc is located, for example, on one side of the bottom cover 102 and fits the cell 401. The housing cavity is sized to fit the dimensions of the cell 401 and the lower cover 102, and serves to secure the cell 401. In one embodiment, two adjacent cells 401 are separated, for example, by a baffle, which is integrally molded with the plastic bracket 30 to prevent short circuits between the cells.

[0056] In one embodiment, the plastic bracket 30 is mechanically connected to the printed circuit board 201. Specifically, the plastic bracket 30 is provided with a plurality of studs, and the printed circuit board 201 is provided with a plurality of nuts that match the studs. The mechanical connection between the studs and nuts secures the plastic bracket 30 to the printed circuit board 201. In this application, the number of studs and nuts is not limited and depends on the actual application.

[0057] In one embodiment, the plastic bracket 30 is mechanically connected to, for example, the top cover 101, specifically, to bolts on the top cover 101, but is not limited to this, and depends specifically on the actual application.

[0058] In one selectable embodiment of the present invention, the printed circuit board 201 is welded to the housing 10.

[0059] Specifically, the printed circuit board 201 is welded to the first connecting bar 1011 and a portion of the second connecting bar 1012 of the housing 10.

[0060] The battery pack provided in this application includes at least the following operating process or principle. The battery pack 100 includes a battery module 40 and a battery management assembly 20, the battery management assembly 20 being connected to the battery module 40. The battery management assembly 20 includes a printed circuit board 201, a positive busbar 202, a negative busbar 203, and a flexible circuit board 204. Here, one end of the positive busbar 202 and one end of the negative busbar 203 are connected to the battery module 40, the other end of the positive busbar 202 and the other end of the negative busbar 203 are connected to the printed circuit board 201, and the flexible circuit board 204 is connected to the positive busbar 202, the negative busbar 203, the battery module 40, and the printed circuit board 201, respectively. This eliminates elements such as transfer connectors, significantly reducing the production and assembly costs of the battery pack, lowering costs, and simplifying the assembly process. [Explanation of symbols]

[0061] 100: Battery pack 10: Cabinet 101: Upper lid 1011: First connection bar 1012: Second connection bar 1013: First output stud 1014: Second output stud 1015: Communication connector 10151: Connection port 10152: Connection pin 1016: Mounting groove 102: Lower lid 1021: Mounting groove 20: Battery Management Assembly 201: Printed circuit board 202: Positive busbar 203: Negative busbar 204: Flexible circuit board 2041: First Flexible Circuit Board 2042: Second Flexible Circuit Board 30: Plastic bracket 301: Fixed part 40: Battery Module 401: Cell 50: Connecting busbar

Claims

1. It includes a battery module (40) and a battery management assembly (20), The battery management assembly (20) is connected to the battery module (40) and includes a printed circuit board (201), a positive busbar (202), a negative busbar (203), and a flexible circuit board (204). One end of the positive busbar (202) and one end of the negative busbar (203) are connected to the battery module (40), the other end of the positive busbar (202) and the other end of the negative busbar (203) are welded to the printed circuit board (201), and the flexible circuit board (204) is welded to the positive busbar (202), the negative busbar (203), the battery module (40), and the printed circuit board (201), respectively. It is a battery pack, The battery pack includes a plastic bracket (30) located between the printed circuit board (201) and the battery module (40) along a first direction, The battery module (40) includes a plurality of cells (401) arranged along a second direction intersecting the first direction, each of the plurality of cells (401) includes a positive electrode and a negative electrode, the positive electrode busbar (202) is connected to the positive electrode of the first or last of the cells (401) arranged along the second direction, and the negative electrode busbar (203) is connected to the negative electrode of the first or last of the cells (401) arranged along the second direction. The plastic bracket (30) is further provided with a plurality of connecting busbars (50), and the connecting busbars (50) connect the positive terminal of one of two adjacent cells (401) to the other negative terminal of two adjacent cells (401), except for the positive terminal of the cell (401) connected to the positive busbar (202) and the negative terminal of the cell (401) connected to the negative busbar (203). The positive and negative electrodes of each of the plurality of cells (401) are located at opposite ends of the cell (401), and the flexible circuit board (204) includes a first flexible circuit board (2041) and a second flexible circuit board (2042), the first flexible circuit board (2041) is welded to the positive electrode busbar (202), the negative electrode busbar (203), the battery module (40), and the printed circuit board (201), respectively, and the second flexible circuit board (2042) is welded to the connecting busbar (50), the battery module (40), and the printed circuit board (201), respectively. The first flexible circuit board (2041), the positive busbar (202), and the negative busbar (203) are located on the same side of the printed circuit board (201), and the second flexible circuit board (2042) is located on the side of the printed circuit board (201) away from the first flexible circuit board (2041). Battery pack.

2. The battery pack includes a housing (10), The housing (10) includes an upper cover (101) and a lower cover (102) provided along the first direction, the upper cover (101) and the lower cover (102) forming a single volume set cavity, the battery module (40), the battery management assembly (20) and the plastic bracket (30) provided within the volume set cavity along the first direction, A first connecting bar (1011) and a second connecting bar (1012) are provided on the side of the top cover (101) away from the battery module (40), and a portion of the first connecting bar (1011) and a portion of the second connecting bar (1012) are provided penetrating the top cover (101) and connected to the printed circuit board (201). The battery pack according to claim 1.

3. On the side of the top cover (101) that is close to the battery module (40) along the first direction, a plurality of mounting grooves (1016) are recessed and provided, and a portion of the first connecting bar (1011) and a portion of the second connecting bar (1012) are respectively provided in the corresponding mounting grooves (1016) along the first direction, and the other portion of the first connecting bar (1011) and the other portion of the second connecting bar (1012) pass through the mounting grooves (1016) and are connected to the printed circuit board (201). The battery pack according to claim 2.

4. The top cover (101) further includes a first output stud (1013) and a second output stud (1014), The first output stud (1013) and the second output stud (1014) are located in corresponding mounting grooves (1016), the first output stud (1013) is connected to the side of the first connecting bar (1011) away from the battery module (40), and the second output stud (1014) is connected to the side of the second connecting bar (1012) away from the battery module (40). The battery pack according to claim 3.

5. The mounting groove (1016) has a mounting height along the first direction, and a portion of the first connecting bar (1011) located within the mounting groove (1016) has a first alignment height in the cross section along the first direction after being connected to the first output stud (1013), and a portion of the second connecting bar (1012) located within the mounting groove (1016) has a second alignment height in the cross section along the first direction after being connected to the second output stud (1014), and both the first alignment height and the second alignment height are less than or equal to the mounting height. The battery pack according to claim 4.

6. The upper cover (101) further includes a communication connector (1015), The communication connector (1015) includes a connection port (10151) and a connection pin (10152), the connection port (10151) being located on the side of the top cover (101) away from the battery module (40), and the connection pin (10152) being partially located within the connection port (10151) and the other part being provided through the top cover (101) and connected to the printed circuit board (201). The battery pack according to claim 4.

7. The top cover (101) is injection molded integrally with the first connecting bar (1011), the second connecting bar (1012), the first output stud (1013), the second output stud (1014), and the communication connector (1015). The battery pack according to claim 6.

8. The printed circuit board (201) is provided parallel to the upper cover (101) and the lower cover (102), and the positive electrode busbar (202), the negative electrode busbar (203), and the flexible circuit board (204) extend from the edge of the printed circuit board (201) toward the volume set cavity along the first direction and are connected to the battery module (40), where the positive and negative electrodes of each of the plurality of cells (401) are located at one end or opposite ends of the cell (401) along the third direction, and the third direction intersects the first direction and the second direction, respectively. The battery pack according to claim 2.

9. A plurality of mounting grooves (1021) are provided on the side of the lower cover (102) that is close to the battery module (40), and the plurality of mounting grooves (1021) are arranged along the second direction, and the plurality of cells (401) are provided in the mounting grooves (1021) along the second direction. The battery pack according to claim 2.

10. The plastic bracket (30) further includes a plurality of fixing parts (301), The plurality of fixing portions (301) are arranged along the second direction and located on the side of the plastic bracket (30) facing the battery module (40), the plurality of fixing portions (301) correspond one-to-one with the plurality of cells (401), and each of the plurality of fixing portions (301) is configured to surround and fix a portion of the cell (401). The battery pack according to claim 9.

11. The printed circuit board (201) is welded to the housing (10). The battery pack according to claim 6.

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