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 priority from a Chinese patent application bearing application number 202420536890.7, filed with the China Patent Office on March 19, 2024, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] As the demand for battery energy density in automobiles increases, battery pack technology must also be constantly optimized. The market is also placing new demands on the manufacturing cost, process reliability, and process ease of lithium batteries. Summary of the Invention [Problem to be solved by the invention]

[0004] Currently, the electrical connection structure of a power battery module has a large number of components and a complex structure, which increases the overall module size, manufacturing costs and assembly costs, resulting in relatively high production and assembly costs. [Means for solving the problem]

[0005] The present application provides a battery pack, the battery pack comprising: A battery module; 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 herein 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 bus bar, a negative bus bar, and a flexible circuit board. 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. This eliminates the need for elements such as transfer connectors, transfer copper bars, bolts, and nuts, significantly reducing the production and assembly costs of the battery pack, thereby achieving the effects of lowering costs and simplifying the assembly process. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram illustrating a configuration of a battery pack provided in some embodiments of the present application. [Figure 2] 1 is an exploded view illustrating a battery pack provided in some embodiments of the present application. [Figure 3] 1 is an exploded plan view illustrating a battery pack provided in some embodiments of the present application. [Figure 4A] FIG. 2 is a schematic diagram illustrating a configuration of an upper cover provided in some embodiments of the present application. [Figure 4B] FIG. 2 is a schematic diagram illustrating a configuration of an upper cover provided in some embodiments of the present application. [Figure 5] FIG. 2 is a schematic diagram illustrating a configuration of a lower cover provided in some embodiments of the present application. [Figure 6] 1 is a schematic diagram showing a configuration of a plastic bracket provided in some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the present description, unless expressly specified or limited, the terms "communication," "connection," and "fixed" are to be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal communication between two elements, or an interaction between two elements. Those skilled in the art may understand the specific meaning of the above terms in the present application depending on the particular situation.

[0010] In this application, unless expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being directly in contact with the second feature, or the first feature being not directly in contact with the second feature but being contacted by another feature therebetween. Also, a first feature being "above," "upper," or "on the upper surface" of a second feature may include the first feature being directly above and diagonally above the second feature, or simply indicating that the first feature is higher than the second feature in the horizontal direction. A first feature being "below," "below," or "on the lower surface" of a second feature may include the first feature being directly below and diagonally below the second feature, or simply indicating that the first feature is lower than the second feature in the horizontal direction.

[0011] In the description of the present embodiment, terms relating to orientations or positional relationships, such as "upper," "lower," and "right," are based on the orientations or positional relationships shown in the drawings and are merely for the purpose of simplifying the description and operation, and should not be construed as limiting the present application, as they do not indicate or suggest devices or elements having a specific orientation, configuration, or operation in a specific orientation. Furthermore, the terms "first" and "second" are merely used to distinguish between the two in the description and do not have any special meaning.

[0012] Although the present application may repeat reference numerals and / or characters in the various embodiments, such repetition is for purposes of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or installations described.

[0013] The battery pack provided herein 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 FIGS. 1, 2 and 3, the present application provides a battery pack 100, which includes: a battery module 40; a battery management assembly (20) that connects to the battery module (40); The battery management assembly 20 includes a printed circuit board 201 , a positive bus bar 202 , a negative bus bar 203 , and a flexible circuit board 204 .

[0015] Here, one end of the positive bus bar 202 and one end of the negative bus bar 203 are connected to the battery module 40, the other end of the positive bus bar 202 and the other end of the negative bus bar 203 are connected to the printed circuit board 201, and the flexible circuit board 204 is connected to the positive bus bar 202, the negative bus bar 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) and is used to transmit current, voltage, or temperature signals and to read the current, voltage, and temperature of the battery module 40. The flexible circuit board 204 is, for example, a flexible printed circuit (FPC) and 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 of the current output.

[0018] In a related technology, a transfer connector is further provided on a printed circuit board (PCB), and 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, and in the related technology, the collection lines and the transfer connector are connected using a plug-in / plug-out means.

[0019] In the 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 the connection bus bar 50 (see later description). 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 eliminating the need for a transfer connector, reducing production costs and simplifying the assembly process. In addition, welding the flexible circuit board 204 to the printed circuit board 201 provides a more stable connection by welding than the plug-in / plug-out connection method of the related art.

[0020] Furthermore, in related art, the positive and negative bus bars are connected to the printed circuit board by transfer copper bars, and the positive and negative bus bars are connected to transfer copper bar bolts. In the 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 eliminating parts such as transfer copper bars, bolts, and nuts, thereby reducing costs and simplifying the assembly process.

[0021] In one alternative embodiment of the present application, the battery pack 100 comprises: The battery module 40 includes a plastic bracket 30 disposed 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 the first direction Y, each of the plurality of cells 401 including a positive electrode and a negative electrode, and the positive electrode bus bar 202 is connected to the positive electrode of the first or last cell 401 arranged along the second direction X, and the negative electrode bus bar 203 is connected to the negative electrode of the first or last cell 401 arranged along the second direction X. Specifically, the plastic bracket 30 provides insulation and improves the strength of the battery pack 100.

[0023] In one optional embodiment of the present application, the plastic bracket 30 is further provided with a plurality of connecting bus bars 50, which connect the positive electrode of one cell 401 to the negative electrode of the other cell 401 of two adjacent cells 401, except for the positive electrode of the cell 401 connected to the positive bus bar 202 and the negative electrode of the cell 401 connected to the negative bus bar 203.

[0024] Specifically, each cell 401 includes a positive electrode and a negative electrode, and the positive electrode and the negative electrode are located at opposite ends of the cell 401, the positive electrodes and the negative electrodes of the multiple cells 401 of the battery module 40 are alternately arranged along the second direction X, the positive electrode poles and the negative electrode poles of the cells 401 are located at opposite ends of the cell 401, the positive electrode bus bar 202 is connected to the positive electrode poles of the cells 401, the negative electrode bus bar 203 is connected to the negative electrode poles of the cells 401, and the positive electrode bus bar 202 and the negative electrode bus bar 203 are located on the same side of the printed circuit board 201, and the multiple positive electrode poles and multiple negative electrode poles that are not connected to the positive electrode bus bar 202 and the negative electrode bus bar 203 are connected by the connection bus bar 50 to form a battery module, and the multiple cells 401 form a current circuit via the connection bus bar 50.

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

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

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

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

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

[0030] In another optional embodiment of the present application, 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 the positive bus bar 202, the negative bus bar 203, the battery module 40, and the printed circuit board 201, respectively, and the second flexible circuit board 2042 being connected to the connection bus bar 50, the battery module 40, and the printed circuit board 201, respectively, and the connection means is, for example, but not limited to, welding.

[0031] Here, the first flexible circuit board 2041, the positive bus bar 202 and the negative bus bar 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 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, respectively, to the first flexible circuit board 204, and the second flexible circuit board 2042 is used to collect the voltage and temperature of the battery module 40.

[0033] 4A and 4B, in one alternative embodiment of the present application, the battery pack 100 includes: The housing 10 includes an upper cover 101 and a lower cover 102 arranged along a first direction Y, and the upper cover 101 and the lower cover 102 form a volume set cavity, and the battery module 40, the battery management assembly 20 and the plastic bracket 30 are arranged in the volume set cavity along the first direction Y.

[0034] Specifically, the printed circuit board 201 is adjacent to the top cover 101, the battery module 40 is adjacent 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, but not limited to, a plastic material.

[0035] Furthermore, the top cover 101 and the bottom cover 102 may be mechanically connected, for example. In one embodiment, the top cover 101 and the bottom cover 102 are connected by bolts, but this is not limited thereto and depends specifically 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, and the first connection bar 1011 and the second connection bar 1012 are, for example, attached to the top cover 101, and a portion of the first connection bar 1011 and a portion of the second connection bar 1012 further penetrate the top cover 101 and are connected to the printed circuit board 201.

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

[0038] Specifically, the first connection bar 1011 and the second connection bar 1012 are made of a metal material, such as copper in this embodiment, but are not limited to this and may vary depending on the actual application. The first connection bar 1011 and the second connection bar 1012, for example, transmit the 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 thereof penetrates the top cover 101 and is welded to the printed circuit board 201 to form a current transmission path, through which 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 for transmission to or communication with an external device.

[0039] In one optional embodiment of the present application, the top cover 101 has a plurality of recessed mounting grooves 1016 on the side closest to the battery module 40, and a portion of the first connection bar 1011 and a portion of the second connection bar 1012 are respectively disposed in the corresponding mounting grooves 1016 along the first direction Y, and another portion of the first connection bar 1011 and another portion of the second connection bar 1012 pass through the mounting grooves 1016 to be connected 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 closest to the battery module 40, thereby facilitating the assembly of the first connection bar 1011 and the second connection bar 1012 and reducing the risk of the first connection bar 1011 and the second connection bar 1012 being damaged during installation or transportation.

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

[0042] In the related art, the connection bars are further connected to transfer copper bars, which are connected to output studs, and the transfer copper bars are connected to connection bar bolts. In contrast, in the embodiment of the present application, the first connection bar 1011 and the second connection bar 1012 are directly connected to the first output studs 1013 and the second output studs 1014, thereby omitting the transfer copper bars, and the first connection bar 1011 and the second connection bar 1012 are welded to the first output studs 1013 and the second output studs 1014, thereby eliminating elements such as bolts and nuts, reducing costs, and simplifying the assembly process.

[0043] Specifically, first output stud 1013 and second output stud 1014 act as locking connections and are lockingly connected to an external vehicle or other device.

[0044] In one optional embodiment of the present application, the mounting grooves 1016 have a mounting height along the first direction Y. A portion of the first connecting bars 1011 located in the mounting grooves 1016 have a first array height in cross section along the first direction Y after being connected to the first output studs 1013. A portion of the second connecting bars 1012 located in the mounting grooves 1016 have a second array height in cross section along the first direction Y after being connected to the second output studs 1014. The first array height and the second array height are equal to or less than the mounting height.

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

[0046] In one optional embodiment of the present application, the top cover 101 further includes a communication connector 1015, which 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 establishing an electrical connection with, for example, an external communication connector, and partially extending through the top cover 101 and connected to the 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 part passing through the connection port 10151 and welded to the printed circuit board 201. Related art typically has two connectors, which are connected by an adapter wire harness, with both ends of the adapter wire harness having adapters connected to the connectors. In the embodiment of the present application, the connection port 10151 is welded to the top cover 101, and the connection pins 10152 are provided in the connection port 10151 and connected to the printed circuit board 201, thereby eliminating the adapter wire harness, adapter, one transfer connector, and elements such as bolts and nuts used to fix the transfer connector used in the related art, thereby reducing costs and simplifying the assembly process.

[0048] In one optional embodiment of the present application, the top cover 101 is integrally injection molded 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 assembly of the battery pack.

[0049] In one optional embodiment of the present application, the printed circuit board 201 is arranged relatively parallel to the top cover 101 and the bottom cover 102, and the positive bus bar 202, the negative bus bar 203 and the flexible circuit board 204 extend from the edge of the printed circuit board 201 toward the inside of the volume set cavity along the first direction Y and are connected to the battery module 40, wherein 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 the third direction Z, thereby reducing the space in the first direction Y within the volume set cavity.

[0050] Specifically, the third direction Z is perpendicular to the first direction Y and the second direction X, and the plurality of cells 401 are arranged in the second direction X, with the positive and negative electrodes of each of the plurality of cells 401 located at one end or opposite ends of the cell 401 along the third direction Z. This means that the plurality of cells 401 are horizontally arranged, thereby reducing the height of the entire battery pack. Due to the horizontal arrangement of the positive and negative electrodes of the plurality of cells 401, the poles of the cells 401 are located on the side, and the flexible circuit board 204 extends from the side and is connected to the battery module 40, thereby reducing the difficulty of assembling the flexible circuit board 204.

[0051] Referring to FIG. 5 , in one optional embodiment of the present application, the lower cover 102 has a plurality of mounting grooves 1021 recessed on the side adjacent to the battery module 40, the plurality of mounting grooves 1021 being arranged along the second direction X, and the plurality of cells being arranged in the mounting grooves 1021 along the second direction X.

[0052] Specifically, the lower cover 102 is provided with a plurality of housing plates, which are surrounded to form a cavity, and the lower cover 102 has a plurality of mounting grooves 1021 recessed into the side closest to the battery module 40, and the plurality of mounting grooves 1021 are also located within the cavity, and the cells 401 are located within the cavity so that a portion of each cell is located within the mounting groove 1021.

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

[0054] Referring to FIG. 6 , in one optional embodiment of the present application, the plastic bracket 30 further includes a plurality of fixing portions 301, which are arranged along the 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 to 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.

[0055] Specifically, the plurality of fixing portions 301 are integrally molded with the plastic bracket 30. The number of mounting grooves 1021 and fixing portions 301 corresponds one-to-one with the number of cells 401. In one embodiment, the cells 401 are cylindrical batteries, and the mounting grooves 1021 are recessed toward the side away from the battery module 40 to mount the cells 401 and prevent the cells 401 from shaking within the battery pack 100 and affecting the battery performance and safety of the battery pack 100. The fixing portions 301 have a receiving cavity on the side facing the battery module 40, and a portion of the cells 401 is located within the receiving cavity. The side of the fixing portions 301 facing the battery module 40 has, for example, an arc shape, and the space formed by this arc shape is, for example, the receiving cavity, and the center of the arc is located, for example, on one side of the bottom cover 102, and is adapted to fit the cells 401. The receiving cavity corresponds to the size of the cell 401 and is fitted to the bottom cover 102 to fix the cell 401. In one embodiment, two adjacent cells 401 are provided with a baffle between them, for example, the baffle 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 the nuts realizes the fixing of the plastic bracket 30 and the printed circuit board 201. The number of studs and nuts is not limited in this application and depends on the actual application.

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

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

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

[0060] The battery pack provided herein includes at least the following operating process or principle: Battery pack 100 includes a battery module 40 and a battery management assembly 20, and battery management assembly 20 is connected to battery module 40. Battery management assembly 20 includes a printed circuit board 201, a positive bus bar 202, a negative bus bar 203, and a flexible circuit board 204. One end of positive bus bar 202 and one end of negative bus bar 203 are connected to battery module 40, and the other end of positive bus bar 202 and the other end of negative bus bar 203 are connected to printed circuit board 201. Flexible circuit board 204 is connected to positive bus bar 202, negative bus bar 203, battery module 40, and printed circuit board 201, respectively. This eliminates the need for elements such as transfer connectors, significantly reducing the production and assembly costs of the battery pack, thereby achieving the effects of lowering costs and simplifying the assembly process. [Explanation of symbols]

[0061] 100: Battery pack 10: Housing 101: Upper lid 1011: First connection bar 1012: Second connection bar 1013: 1st output stud 1014: 2nd output stud 1015: Communication connector 10151: Connection port 10152: Connection pin 1016: Mounting groove 102: Lower lid 1021: Placement groove 20: Battery management assembly 201: Printed circuit board 202: Positive bus bar 203: Negative bus bar 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: Connection busbar

Claims

1. 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 bus bar (202), a negative bus bar (203), and a flexible circuit board (204); One end of the positive bus bar (202) and one end of the negative bus bar (203) are connected to the battery module (40), the other end of the positive bus bar (202) and the other end of the negative bus bar (203) are connected to the printed circuit board (201), and the flexible circuit board (204) is connected to the positive bus bar (202), the negative bus bar (203), the battery module (40), and the printed circuit board (201), respectively. Battery pack.

2. The battery pack includes a plastic bracket (30) positioned 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) including a positive electrode and a negative electrode, the positive electrode bus bar (202) being connected to the positive electrode of the first or last cell (401) arranged along the second direction, and the negative electrode bus bar (203) being connected to the negative electrode of the first or last cell (401) arranged along the second direction. The battery pack according to claim 1 .

3. The plastic bracket (30) is further provided with a plurality of connection bus bars (50), which connect the positive electrode of one of two adjacent cells (401) to the negative electrode of the other of two adjacent cells (401), except for the positive electrode of the cell (401) connected to the positive electrode bus bar (202) and the negative electrode of the cell (401) connected to the negative electrode bus bar (203). The battery pack according to claim 2 .

4. The flexible circuit board (204) includes a first flexible circuit board (2041), and the positive and negative electrodes of the plurality of cells (401) and the first flexible circuit board (2041) are located on the same side, and the first flexible circuit board (2041) is connected to the positive bus bar (202), the negative bus bar (203), the battery module (40), and the printed circuit board (201), respectively. The battery pack according to any one of claims 1 to 3.

5. 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), and the first flexible circuit board (2041) is connected to the positive bus bar (202), the negative bus bar (203), the battery module (40), and the printed circuit board (201), respectively, and the second flexible circuit board (2042) is connected to the connection bus bar (50), the battery module (40), and the printed circuit board (201), respectively. The first flexible circuit board (2041), the positive bus bar (202), and the negative bus bar (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). The battery pack according to any one of claims 1 to 3.

6. 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 volume set cavity, and the battery module (40), the battery management assembly (20), and the plastic bracket (30) are provided in the volume set cavity along the first direction; 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), and a part of the first connection bar (1011) and a part of the second connection bar (1012) are provided through the top cover (101) and connected to the printed circuit board (201). The battery pack according to claim 3 .

7. A plurality of mounting grooves (1016) are recessed on the side of the top cover (101) adjacent to the battery module (40) along the first direction, and a portion of the first connection bar (1011) and a portion of the second connection bar (1012) are respectively provided in the corresponding mounting grooves (1016) along the first direction, and another portion of the first connection bar (1011) and another portion of the second connection bar (1012) pass through the mounting grooves (1016) and are connected to the printed circuit board (201). The battery pack according to claim 6.

8. 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 respectively positioned in the corresponding mounting grooves (1016), the first output stud (1013) is connected to the side of the first connection bar (1011) away from the battery module (40), and the second output stud (1014) is connected to the side of the second connection bar (1012) away from the battery module (40). The battery pack according to claim 7.

9. The mounting groove (1016) has a mounting height along the first direction, a portion of the first connection bars (1011) located in the mounting groove (1016) has a first array height in a cross section along the first direction after being connected to the first output stud (1013), and a portion of the second connection bars (1012) located in the mounting groove (1016) has a second array height in a cross section along the first direction after being connected to the second output stud (1014), and both the first array height and the second array height are less than or equal to the mounting height. The battery pack according to claim 8.

10. The top cover (101) further includes a communication connector (1015); The communication connector (1015) includes a connection port (10151) and connection pins (10152), the connection port (10151) being located on the side of the top cover (101) away from the battery module (40), and the connection pins (10152) being partially located within the connection port (10151) and partially extending through the top cover (101) and connected to the printed circuit board (201). The battery pack according to claim 8.

11. 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); The battery pack according to claim 10.

12. The printed circuit board (201) is arranged relatively parallel to the upper cover (101) and the lower cover (102), and the positive bus bar (202), the negative bus bar (203), and the flexible circuit board (204) extend from an edge of the printed circuit board (201) toward the inside of the volume set cavity along the first direction and are connected to the battery module (40), wherein 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, and the third direction intersects with the first direction and the second direction, respectively. The battery pack according to claim 6.

13. A plurality of mounting grooves (1021) are provided on the side of the lower cover (102) adjacent 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 6.

14. The plastic bracket (30) further includes a plurality of fixing portions (301); The plurality of fixing portions (301) are arranged along the second direction and are located on a side of the plastic bracket (30) facing the battery module (40), the plurality of fixing portions (301) correspond one-to-one to 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 13.

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

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