Battery pack

Abstract

The present application provides a battery pack, comprising: a battery module; and a battery management assembly connected to the battery module, wherein the battery management assembly comprises 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, and the other ends of the positive busbar and 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.

Description

battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 19, 2024, with application number 202420536890.7. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of batteries, and in particular to a battery pack. Background Art

[0003] As automobiles increasingly demand higher battery energy density, battery pack technology must be continuously optimized. The market also places new demands on lithium battery manufacturing costs, process reliability, and process simplicity. SUMMARY OF THE INVENTION

[0004] Currently, the electrical connection structure of the power battery module has many parts and a complex structure, which increases the overall size of the module, manufacturing cost and assembly cost, resulting in high production and assembly costs.

[0005] The present application provides a battery pack, comprising:

[0006] battery modules; and

[0007] A battery management component connected to the battery module, the battery management component includes: a printed circuit board, a positive bus bar, a negative bus bar and a flexible circuit board;

[0008] Among them, one end of the positive bus and the negative bus is connected to the battery module, and the other end is connected to the printed circuit board. The flexible circuit board is respectively connected to the positive bus, the negative bus, the battery module and the printed circuit board. Beneficial effects

[0009] The battery pack provided in this application includes a battery module and a battery management assembly. The battery management assembly is connected to the battery module and includes: a printed circuit board, a positive bus bar, a negative bus bar, and a flexible circuit board. The positive bus bar and the negative bus bar are connected to the battery module at one end and to the printed circuit board at the other end. The flexible circuit board is respectively connected to the positive bus bar, the negative bus bar, the battery module, and the printed circuit board. This eliminates materials such as adapter connectors, adapter copper bars, bolts, and nuts, greatly reducing the production and assembly costs of the battery pack, achieving the effect of reducing costs and simplifying the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic structural diagram of a battery pack provided by some implementations of the present application.

[0011] FIG2 is an exploded structural diagram of a battery pack provided in some implementations of the present application.

[0012] FIG3 is an exploded top view of a battery pack provided in some implementations of the present application.

[0013] 4A and 4B are schematic structural diagrams of an upper cover provided in some implementations of the present application.

[0014] FIG5 is a schematic structural diagram of a lower cover provided by some implementations of the present application.

[0015] FIG6 is a schematic structural diagram of a plastic bracket provided in some implementations of the present application.

[0016] Description of reference numerals:

[0017] 100-battery pack; 10-housing; 101-upper cover; 1011-first connecting row; 1012-second connecting row; 1013-first output stud; 1014-second output stud; 1015-communication connector; 10151-connection port; 10152-connection pin; 1016, mounting slot; 102-lower cover; 1021-placement slot; 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-fixing part; 40-battery module; 401-battery; 50-connection bus bar. Modes for Carrying Out the Invention

[0018] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0019] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, with the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, with the first feature having a lower horizontal height than the second feature.

[0020] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are intended to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0021] The present application may repeat reference numerals and / or reference letters in different embodiments. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0022] The battery pack provided in the present application will be described in detail below with reference to specific embodiments and accompanying drawings. In one embodiment, the battery pack includes, for example, cylindrical batteries.

[0023] Referring to FIG. 1 , FIG. 2 , and FIG. 3 , the present application provides a battery pack 100 , including:

[0024] Battery module 40; and

[0025] 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;

[0026] Among them, one end of the positive bus bar 202 and the negative bus bar 203 are connected to the battery module 40, and the other end is connected to the printed circuit board 201. The flexible circuit board 204 is respectively connected to the positive bus bar 202, the negative bus bar 203, the battery module 40 and the printed circuit board 201.

[0027] Specifically, the printed circuit board 201 is, for example, a printed circuit board (PCB), used to transmit current, voltage, or temperature signals and read the current, voltage, and temperature of the battery module 40. The flexible printed circuit board 204 is, for example, a flexible printed circuit (FPC), used to collect the voltage and temperature of the battery module 40.

[0028] In one embodiment, the printed circuit board 201 is further provided with a plurality of MOS switches for controlling the start and stop of the current output.

[0029] In the related art, an adapter connector is also provided on the printed circuit board (PCB). The acquisition lines for collecting voltage and temperature connect the adapter connector and the bus (positive and negative bus and series-parallel bus) to realize signal transmission and data reading. In the related art, the acquisition lines and the adapter connector are connected in a plug-in manner.

[0030] In an embodiment of the present application, the flexible circuit board 204 is welded to the positive bus 202, the negative bus 203, the battery module 40 and the printed circuit board 201, respectively. In one embodiment, the flexible circuit board 204 is also connected to the connecting bus 50 (described 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, eliminating the adapter connector structure, reducing production costs and assembly processes. At the same time, the flexible circuit board 204 is welded to the printed circuit board 201, and the welding connection is more stable compared to the plug-and-socket docking method of the related technology.

[0031] Furthermore, in related art, the positive and negative busbars are each connected to the printed circuit board via a copper transfer busbar, and the positive and negative busbars are bolted to the copper transfer busbars. In the embodiment of the present application, the positive busbar 202 and the negative busbar 203 are directly welded to the printed circuit board 201, eliminating parts such as copper transfer busbars, bolts, and nuts, thereby reducing costs and simplifying the process.

[0032] In an optional embodiment of the present application, the battery pack 100 includes:

[0033] The plastic bracket 30 is disposed between the printed circuit board 201 and the battery module 40 along the first direction Y;

[0034] The battery module 40 includes a plurality of batteries 401 arranged along a second direction X intersecting the first direction Y. The batteries 401 include positive and negative electrodes. The positive electrode bus 202 is connected to the positive electrode of the first or last battery 401 arranged along the second direction X, and the negative electrode bus 203 is connected to the negative electrode of the first or last battery 401 arranged along the second direction X. Specifically, the plastic bracket 30 provides insulation and increases the strength of the battery pack 100.

[0035] In an optional embodiment of the present application, a plurality of connecting busbars 50 are further provided on the plastic bracket 30. In addition to the positive and negative electrodes of the battery 401 connected by the positive busbar 202 and the negative busbar 203, the connecting busbar 50 connects the positive electrode of one of the two adjacent batteries 401 and the negative electrode of the other battery 401.

[0036] Specifically, the battery 401 includes a positive electrode and a negative electrode, which are respectively located at the two ends of the battery 401. The positive electrodes and negative electrodes of the multiple batteries 401 of the battery module 40 are staggered along the second direction X. The positive electrode posts and negative electrode posts of the battery 401 are respectively located at the two ends of the battery 401. The positive bus 202 is connected to the positive electrode post of the battery 401, and the negative bus 203 is connected to the negative electrode post of the battery 401, and are located on the same side of the printed circuit board 201. Multiple positive and negative electrode posts that are not connected to the positive bus 202 and the negative bus 203 are respectively connected through the connecting bus 50 to form a battery module. A current loop is formed between the multiple batteries 401 through the connecting bus 50.

[0037] In one embodiment, the number of batteries 401 is, for example, four, and the positive and negative electrodes of the four batteries 401 are staggered along the second direction X. The positive busbar 202 is connected to the positive electrode of the outermost battery 401 of the four batteries 401, and the negative busbar 203 is connected to the negative electrode of the other outermost battery 401. The positive and negative electrodes of the batteries connected to the positive and negative electrodes of the positive and negative electrodes of the positive and negative electrodes of the batteries 401 are located on the same side. The positive and negative electrodes of the two middle batteries 401 are connected by a connecting busbar 50. The negative electrode of the outermost battery 401, which is away from the positive busbar 202, is connected to the positive electrode of the adjacent battery 401 by the connecting busbar 50. The positive and negative electrodes of the other two batteries 401 are connected by the connecting busbar 50 to form a current loop. However, the connection method of the connecting busbar 50 is not limited to this, and the specific method will depend on the actual application.

[0038] In one embodiment, the positive busbar 202 , the negative busbar 203 and the connecting busbar 50 are made of aluminum, for example, but not limited to, and are used to collect, collect or transmit the current of the battery module 40 .

[0039] In one embodiment, a shunt is further integrated on the printed circuit board 201 , and the current is transmitted through the shunt to the first connection bar 1011 or the second connection bar 1012 .

[0040] In an optional embodiment of the present application, the positive and negative electrodes of the battery 401 are located at the same end of the battery 401; the flexible circuit board 204 includes a first flexible circuit board 2041, which is respectively connected to the positive bus 202, the negative bus 203, the battery module 40 and the printed circuit board 201.

[0041] Specifically, when the positive and negative electrodes of the battery 401 are located at the same end of the battery 401 , the first flexible circuit board 2041 and the positive and negative electrodes of the battery 401 are located on the same side, which facilitates the connection between the first flexible circuit board 2041 and the battery module 40 .

[0042] In another optional embodiment of the present application, the positive and negative electrodes of the battery 401 are located at opposite ends of the battery 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 is respectively connected to the positive bus 202, the negative bus 203, the battery module 40 and the printed circuit board 201, and the second flexible circuit board 2042 is respectively connected to the connecting bus 50, the battery module 40 and the printed circuit board 201, and the connection method is, for example, welding, but not limited thereto; wherein,

[0043] 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 a side of the printed circuit board 201 away from the first flexible circuit board 204 .

[0044] 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 with 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 .

[0045] Referring to FIG. 4A and FIG. 4B , in an optional embodiment of the present application, the battery pack 100 includes:

[0046] The housing 10 includes an upper cover 101 and a lower cover 102 arranged along a first direction Y. The upper cover 101 and the lower cover 102 form a receiving cavity. The battery module 40, the battery management assembly 20 and the plastic bracket 30 are arranged in the receiving cavity along the first direction Y.

[0047] Specifically, the printed circuit board 201 is close to the upper cover 101 , the battery module 40 is close to the lower 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 plastic, for example, but not limited thereto.

[0048] Furthermore, the upper cover 101 and the lower cover 102 may be mechanically connected, for example. In one embodiment, the upper cover 101 and the lower cover 102 are connected by bolts, but the present invention is not limited thereto and the specific connection shall be subject to actual application.

[0049] Furthermore, a first connecting row 1011 and a second connecting row 1012 are provided on the side of the upper cover 101 away from the battery module 40. The first connecting row 1011 and the second connecting row 1012 are, for example, attached to the upper cover 101. Parts of the first connecting row 1011 and the second connecting row 1012 also pass through the upper cover 101 and are connected to the printed circuit board 201.

[0050] Specifically, the first connecting bar 1011 is located above the positive bus 202 along the first direction Y, and the first connecting bar 1011 forms a current loop with the positive bus 202 through the printed circuit board 201 and, for example, transmits the output current to an external device. The second connecting bar 1012 is located above the negative bus 203 along the first direction Y, and the second connecting bar 1012 forms a current loop with the negative bus 203 through the printed circuit board 201.

[0051] Specifically, the first connecting bar 1011 and the second connecting bar 1012 are made of metal material, for example, copper material in this embodiment, but not limited thereto, and the specific application shall prevail. The first connecting bar 1011 and the second connecting bar 1012 can, for example, transmit the current, voltage or temperature of the battery module 40. In one embodiment, the first connecting bar 1011 and the second connecting bar 1012 are located on the upper cover 101, and partially penetrate the upper cover 101 and are welded to the printed circuit board 201 to form a current transmission path, which is transmitted from the positive bus bar 202 and the negative bus bar 203 to the first connecting bar 1011 and the second connecting bar 1012, and the current is transmitted or connected to the external device.

[0052] In an optional embodiment of the present application, a plurality of mounting grooves 1016 are recessed on the side of the upper cover 101 close to the battery module 40, and part of the first connection row 1011 and the second connection row 1012 are respectively arranged in the mounting grooves 1016 along the first direction Y, and another part of the first connection row 1011 and the second connection row 1012 pass through the mounting grooves 1016 and are connected to the printed circuit board 201.

[0053] Specifically, the number of mounting grooves 1016 in this embodiment is, for example, two, but is not limited thereto and depends on actual application. The mounting grooves 1016 are recessed along the first direction Y toward the side closest to the battery module 40 to facilitate assembly of the first connecting bar 1011 and the second connecting bar 1012, thereby reducing the risk of damage to the first connecting bar 1011 and the second connecting bar 1012 during installation or transportation.

[0054] In an optional embodiment of the present application, the upper cover 101 further includes:

[0055] The first output stud 1013 and the second output stud 1014 are located in the mounting groove 1016 . The first output stud 1013 is connected to the side of the first connecting row 1011 away from the battery module 40 . The second output stud 1014 is connected to the side of the second connecting row 1012 away from the battery module 40 .

[0056] In the related art, the connecting bar is also connected to the transfer copper bar, the transfer copper bar is connected to the output stud, and the transfer copper bar is bolted to the connecting bar. In the embodiment of the present application, 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, eliminating the transfer copper bar. The first connecting bar 1011 and the second connecting bar 1012 are directly welded to the first output stud 1013 and the second output stud 1014, eliminating bolts, nuts and other materials, thereby achieving the effect of reducing costs and simplifying the assembly process.

[0057] Specifically, the first output stud 1013 and the second output stud 1014 function as a locking connection, and are locked to an external vehicle or other equipment.

[0058] In an optional embodiment of the present application, the mounting groove 1016 has an installation height along the first direction Y, and after the portion of the first connecting row 1011 and the first output stud 1013 located in the mounting groove 1016 is connected, the cross-section along the first direction Y has a first arrangement height, and after the portion of the second connecting row 1012 and the second output stud 1014 located in the mounting groove 1016 is connected, the cross-section along the first direction Y has a second arrangement height, and the first arrangement height and the second arrangement height are less than or equal to the mounting height.

[0059] Specifically, the mounting grooves 1016 have an installation height along the first direction Y toward the side of the battery module 40. The two mounting grooves 1016 are configured to respectively accommodate the first connection bar 1011 and the first output stud 1013, and the second connection bar 1012 and the second output stud 1014. The ends of the first output stud 1013 and / or the second output stud 1014 away from the battery module 40 are flush with the side of the upper 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 upper 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 being knocked crooked or damaged during installation or transportation.

[0060] In an optional embodiment of the present application, the upper cover 101 further includes:

[0061] The communication connector 1015 includes a connection port 10151 and a connection pin 10152. The connection port 10151 is located on the side of the upper cover 101 away from the battery module 40. Part of the connection pin 10152 is located inside the connection port 10151, for example, to establish an electrical connection with an external communication connector, and the other part passes through the upper cover 101 and is connected to the printed circuit board 201.

[0062] Specifically, the number of connecting pins 10152 is, for example, 4. Part of the connecting pins 10152 is connected to the external communication connector, and the other part is passed through the connecting port 10151 and welded to the printed circuit board 201. In the related art, there are usually two connectors, which are connected by a transfer harness, and the two ends of the transfer harness have adapters, which are respectively connected to the connectors. In the embodiment of the present application, the connecting port 10151 is welded on the upper cover 101, and the connecting pins 10152 are provided in the connecting port 10151 and connected to the printed circuit board 201, eliminating the transfer harness, adapter, an adapter connector, and bolts and nuts for fixing the adapter connector in the related art, thereby achieving the effect of reducing costs and simplifying the assembly process.

[0063] In an optional embodiment of the present application, the upper cover 101 and the first connection row 1011, the second connection row 1012, the first output stud 1013, the second output stud 1014 and the communication connector 1015 are integrally injection molded, which has the effect of reducing costs and facilitating battery packaging.

[0064] In an optional embodiment of the present application, the printed circuit board 201 is arranged relatively parallel to the upper cover 101 and the lower cover 102, and the positive bus 202, the negative bus 203 and the flexible circuit board 204 extend from the edge of the printed circuit board 201 along the first direction Y into the accommodating cavity and are connected to the battery module 40, wherein the positive and negative electrodes of the multiple batteries 401 are located at one end or opposite ends of the battery 401 along the third direction Z, saving space in the first direction Y in the accommodating cavity.

[0065] Specifically, the third direction Z is arranged perpendicular to the first direction Y and the second direction X, respectively. The multiple batteries 401 are arranged along the second direction X, and the positive and negative electrodes of the multiple batteries 401 are located at one end or opposite ends of the battery 401 along the third direction Z. It can be understood that the multiple batteries 401 are placed horizontally, thereby reducing the height of the entire battery pack. Based on the positive and negative electrodes of the multiple batteries 401 arranged horizontally, the poles of the battery 401 are on the side, and the flexible circuit board 204 extends from the side and is connected to the battery module 40, which reduces the difficulty of assembling the flexible circuit board 204.

[0066] Please refer to Figure 5. In an optional embodiment of the present application, a side of the lower cover 102 close to the battery module 40 is concavely provided with multiple placement grooves 1021. The multiple placement grooves 1021 are arranged along the second direction X, and multiple batteries are arranged in the placement grooves 1021 along the second direction X.

[0067] Specifically, the lower cover 102 is provided with multiple outer shell plates, which are arranged to form a cavity. A side of the lower cover 102 close to the battery module 40 is recessed with multiple placement grooves 1021, and the multiple placement grooves 1021 are also located in the cavity. The battery 401 is located in the placement grooves 1021 in the cavity.

[0068] Furthermore, the lower cover 102 may be provided with a connector socket for connecting to an external device.

[0069] Please refer to FIG6 . In an optional embodiment of the present application, the plastic bracket 30 further includes:

[0070] The plurality of fixing portions 301 are arranged along the second direction X. The fixing portions 301 are located on the 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 batteries 401 . The fixing portions 301 are configured to surround and fix part of the batteries 401 .

[0071] Specifically, multiple fixing portions 301 are integrally formed with the plastic bracket 30. The number of placement slots 1021 and fixing portions 301 corresponds to the number of batteries 401. In one embodiment, the batteries 401 are cylindrical batteries. The placement slots 1021 are recessed toward the side away from the battery module 40, serving to accommodate the batteries 401 and prevent them from moving within the battery pack 100 and affecting the performance and safety of the battery pack 100. The fixing portion 301 has a receiving cavity on the side facing the battery module 40, with the batteries 401 partially located within the receiving cavity. The side of the fixing portion 301 facing the battery module 40 has, for example, an arc-shaped shape, with the space formed by the arc forming the receiving cavity, and the center of the arc located on the side of the lower cover 102 to accommodate the batteries 401. The receiving cavity is adapted to the size of the batteries 401 and cooperates with the lower cover 102 to secure the batteries 401. In one embodiment, a baffle is provided between two adjacent batteries 401, for example, and is integrally formed with the plastic bracket 30 to prevent short circuits between the batteries.

[0072] 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 two are mechanically connected to secure the plastic bracket 30 to the printed circuit board 201. The number of studs and nuts is not limited in this application and is subject to actual application.

[0073] In one embodiment, the plastic bracket 30 is mechanically connected to the upper cover 101 , for example. Specifically, the plastic bracket 30 is connected to the upper cover 101 by bolts, but the present invention is not limited thereto and is subject to actual application.

[0074] In an optional embodiment of the present application, the printed circuit board 201 is welded to the housing 10 .

[0075] Specifically, the printed circuit board 201 is welded to portions of the first connection row 1011 and the second connection row 1012 of the housing 10 .

[0076] 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, which is connected to the 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. The positive bus bar 202 and the negative bus bar 203 are connected to the battery module 40 at one end and to the printed circuit board 201 at the other end. 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. This eliminates the need for adapter connectors and other materials, significantly reducing the production and assembly costs of the battery pack, thereby reducing costs and simplifying the assembly process.

Claims

1. A battery pack comprising: Battery module (40); and A battery management component (20) is connected to the battery module (40), and the battery management component (20) comprises: 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 the negative busbar (203) are connected to the battery module (40), and the other end is connected to the printed circuit board (201); the flexible circuit board (204) is respectively connected to the positive busbar (202), the negative busbar (203), the battery module (40), and the printed circuit board (201).

2. The battery pack according to claim 1, wherein: The battery pack includes: A plastic bracket (30) is located between the printed circuit board (201) and the battery module (40) along a first direction; The battery module (40) includes a plurality of batteries (401) arranged along a second direction intersecting the first direction, the batteries (401) including a positive electrode and a negative electrode, the positive electrode bus (202) being connected to the positive electrode of the first or last battery (401) arranged along the second direction, and the negative electrode bus (203) being connected to the negative electrode of the first or last battery (401) arranged along the second direction.

3. The battery pack according to claim 2, wherein: The plastic support (30) is further provided with a plurality of connecting busbars (50). In addition to the positive electrode busbar (202) and the negative electrode busbar (203) being connected to the positive electrode and the negative electrode of the battery (401), the connecting busbar (50) is used to connect the positive electrode and the negative electrode of two adjacent batteries (401).

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

5. The battery pack according to any one of claims 1 to 3, wherein: The positive electrode and the negative electrode of the battery (401) are located at opposite ends of the battery (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 respectively connected to the positive bus bar (202), the negative bus bar (203), the battery module (40) and the printed circuit board (201), and the second flexible circuit board (2042) being respectively connected to the connecting bus bar (50), the battery module (40) and the printed circuit board (201); wherein, 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 a side of the printed circuit board (201) away from the first flexible circuit board (2041).

6. The battery pack according to claim 3, wherein: The battery pack includes: A housing (10) comprising an upper cover (101) and a lower cover (102) arranged along the first direction, wherein the upper cover (101) and the lower cover (102) form a receiving cavity, and the battery module (40), the battery management assembly (20), and the plastic bracket (30) are arranged in the receiving cavity along the first direction; A first connection row (1011) and a second connection row (1012) are provided on a side of the upper cover (101) away from the battery module (40), and portions of the first connection row (1011) and the second connection row (1012) pass through the upper cover (101) and are connected to the printed circuit board (201).

7. The battery pack according to claim 6, wherein: The upper cover (101) is provided with a plurality of mounting grooves (1016) along the first direction toward a side close to the battery module (40); a portion of the first connecting rows (1011) and the second connecting rows (1012) are respectively arranged in the mounting grooves (1016) along the first direction; another portion of the first connecting rows (1011) and the second connecting rows (1012) pass through the mounting grooves (1016) to be connected to the printed circuit board (201).

8. The battery pack according to claim 7, wherein: The upper cover (101) further includes: A first output stud (1013) and a second output stud (1014) are located in the mounting groove (1016), the first output stud (1013) being connected to a side of the first connection row (1011) away from the battery module (40), and the second output stud (1014) being connected to a side of the second connection row (1012) away from the battery module (40).

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

10. The battery pack according to claim 8, wherein: The upper cover (101) further includes: The communication connector (1015) comprises a connection port (10151) and a connection pin (10152), wherein the connection port (10151) is located on a side of the upper cover (101) away from the battery module (40), and the connection pin (10152) is partially located within the connection port (10151), and the other portion passes through the upper cover (101) and is connected to the printed circuit board (201).

11. The battery pack according to claim 10, wherein: The upper cover (101), the first connection row (1011), the second connection row (1012), the first output stud (1013), the second output stud (1014), and the communication connector (1015) are integrally injection-molded.

12. The battery pack according to claim 6, wherein: The printed circuit board (201) is arranged relatively parallel to the upper cover (101) and the lower cover (102); 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) along the first direction into the accommodating cavity and are connected to the battery module (40); wherein the positive and negative electrodes of the plurality of batteries (401) are located at one end or two opposite ends of the battery (401) along a third direction, and the third direction intersects with the first direction and the second direction respectively.

13. The battery pack according to claim 6, wherein: A plurality of placement grooves (1021) are provided on a side of the lower cover (102) close to the battery module (40), the plurality of placement grooves (1021) are arranged along the second direction, and the plurality of batteries (401) are arranged in the placement grooves (1021) along the second direction.

14. The battery pack according to claim 13, wherein: The plastic bracket (30) further includes: A plurality of fixing portions (301) are arranged along the second direction, the fixing portions (301) 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 batteries (401), and the fixing portions (301) are configured to surround and fix a portion of the batteries (401).

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

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