Battery pack

Abstract

A battery pack comprising: a battery module (40); and a battery management component (20) connected to the battery module (40), the battery management component (20) comprising a printed circuit board (201), a positive current busbar (202), a negative current busbar (203) and a flexible printed circuit board (204); wherein one end of the positive current busbar (202) and the negative current busbar (203) is connected to the battery module (40) and another end of the positive current busbar (202) and the negative current busbar (203) is connected to the printed circuit board (201), the flexible printed circuit board (204) being connected to the positive current busbar (202), the negative current busbar (203), the battery module (40) and the printed circuit board (201), respectively.

Description

FIELD OF APPLICATIONThis application relates to the field of batteries, and more particularly to a battery pack.PRIOR ARTAs the energy density requirement of batteries in vehicles increases, the grouping technology for batteries also has to be continuously optimized. The market also presents new requirements for the manufacturing cost of lithium batteries, the reliability of the manufacturing processes and the simplicity of the processes.TECHNICAL PROBLEMAt present, the number of components in the electrical connection structure of traction battery modules is high, and the structure is complex, which increases the overall size of the module, the manufacturing cost, and the assembly cost, and results in higher production and assembly costs.DISCLOSURE OF THE APPLICATIONThe present application relates to a battery pack including: a battery module; and a battery management component connected to the battery module, the battery management component including: a circuit board, a positive bus bar, a negative bus bar, and a flexible circuit board; wherein one end of the positive bus bar and the negative bus bar is connected to the battery module, the other end is connected to the circuit board, and the flexible circuit board is connected to the positive bus bar, the negative bus bar, the battery module, and the circuit board, respectively.ADVANTAGES OF THE APPLICATIONThe battery pack described in this application includes a battery module and a battery management component connected to the battery module. The battery management component includes a circuit board, a positive bus bar, a negative bus bar, and a flexible circuit board, wherein one end of the positive bus bar and the negative bus bar is connected to the battery module, the other end is connected to the circuit board, and the flexible circuit board is connected to the positive bus bar, the negative bus bar, the battery module, and the circuit board, respectively. This saves connecting adapters, transition copper strips, screws and nuts, which significantly reduces the production and assembly costs of the battery pack and thus enables the cost reduction and the simplification of the assembly.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a schematic illustration view of the structure of the battery pack according to some embodiments of the present application. FIG. 2 is an exploded view of the structure of the battery pack according to some embodiments of the present application. FIG. 3 is an exploded top view of the battery pack according to some embodiments of the present application. FIGS. 4A and 4B are schematic illustration views of the structure of the top cover according to some embodiments of the present application. FIG. 5 is a schematic illustration view of the structure of the undercover according to some embodiments of the present application. FIG. 6 is a schematic illustration view of the structure of the plastic fixture according to some embodiments of the present application.Reference Number:100 - Battery pack; 10 - Housing; 101 - Upper cover; 1011 - First terminal board; 1012 - Second terminal board; 1013 - First output pin; 1014 - Second output pin; 1015 - Communication connector; 10151 - Female connector; 10152 - Terminal pin; 1016 - Mounting slot; 102 - Lower cover; 1021 - Receiving slot; 20 - Battery management component; 201 - 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 holder; 301 - Fixing portion; 40 - Battery module; 401 - Battery; 50 - Connection bus bar.EMBODIMENTS OF THE APPLICATIONHereinafter, the battery pack provided in this application will be described in detail in conjunction with specific embodiments and the accompanying drawings. In one embodiment, the battery pack includes, for example, cylindrical batteries.Please refer to FIGS. 1, 2, and 3, the battery pack 100 provided in this application includes: a battery module 40; and a battery management component 20 connected to the battery module 40. The battery management component 20 includes a circuit board 201, a positive bus bar 202, a negative bus bar 203, and a flexible circuit board 204, wherein one end of the positive bus bar 202 and the negative bus bar 203 is connected to the battery module 40, the other end of the positive bus bar 202 and the negative bus bar 203 is connected to the 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 circuit board 201, respectively.Specifically, the circuit board 201 is, for example, a printed circuit board (PCB) used for transmitting currents, voltages, or temperature signals as well as for measuring current, voltage, and temperature of the battery module 40. The flexible circuit board 204 is, for example, a flexible printed circuit (FPC) used for measuring the voltage and temperature of the battery module 40.For example, in one embodiment, the circuit board 201 is equipped with multiple MOS switches used to control the current output.In the prior art, an adapter terminal is also provided on the printed circuit board (PCB), wherein the measurement lines for voltage and temperature are connected to the adapter terminal and the busbars (positive and negative busbar and parallel and serial busbars) in order to enable signal transmission and data measurement. In the conventional technique, the measurement lines are mounted with the adapter terminal in a plug and socket connection.In the present embodiment, the flexible circuit board 204 is soldered to each of the positive bus bar 202, the negative bus bar 203, the battery module 40, and the circuit board 201. In one embodiment, the flexible circuit board 204 is also connected to the connection bus bar 50 (see description below). The flexible circuit board 204 serves to measure the voltage and temperature of the battery module 40 and is directly connected to the circuit board 201, thereby omitting the adapter terminal structure, which reduces the production cost and the assembly cost. At the same time, the solder connection of the flexible printed circuit board 204 to the printed circuit board 201 provides a more stable connection compared to the conventional plug and socket connection.Further, in the related art, the positive busbar and the negative busbar are each connected to the circuit board via transition copper strips, the positive and negative busbars being connected to the transition copper strips by screws. In the present embodiment, the positive bus bar 202 and the negative bus bar 203 are soldered directly on the circuit board 201, thereby saving transitional copper strips, bolts, and nuts, resulting in cost reduction and simplified assembly.In an optional embodiment, the battery pack 100 includes: a resin holder 30 disposed between the circuit board 201 and the battery module 40 in a first direction Y.The battery module 40 includes a plurality of batteries 401 arranged along a second direction X crossing the first direction Y. The battery 401 includes a positive and a negative electrode, wherein the positive bus bar 202 is connected to the positive electrode of the first or last battery 401 in the second direction X, and the negative bus bar 203 is connected to the negative electrode of the first or last battery 401 in the second direction X. Specifically, the resin holder 30 has an insulating function and increases the strength of the battery pack 100.In the present embodiment, a connection bus bar 50 is also provided on the resin holder 30, the positive bus bar 202 and the negative bus bar 203 being connected to the positive electrode and the negative electrode of the batteries 401, respectively, the connection bus bars 50 connecting the positive electrode of one of the adjacent batteries 401 to the negative electrode of the other.Specifically, the battery 401 includes positive and negative electrodes located at both ends of the battery 401. The positive and negative electrodes of the plurality of batteries 401 in the battery module 40 are arranged offset along the second direction X. The positive electrode and the negative electrode of the battery 401 are respectively located at both ends of the battery 401. The positive bus bar 202 is connected to the positive electrode of the battery 401, and the negative bus bar 203 is connected to the negative electrode of the battery 401. Both rails are located on the same side of the printed circuit board 201. A plurality of positive electrodes and negative electrodes not connected to the positive and negative bus bars 202 and 203 are respectively connected by the connection bus bar 50 to form the battery module. The connection bus bar 50 constitutes the circuit between the plurality of batteries 401.In one embodiment, the number of batteries 401 is, for example, 4 batteries. The positive and negative electrodes of the four batteries 401 are arranged offset along the second direction X. The positive bus bar 202 is connected to the positive electrode of the outermost battery 401, and the negative bus bar 203 is connected to the negative electrode of the other outermost battery 401. The positive bus bar 202, the negative bus bar 203, and the positive and negative electrodes of the two connected batteries are located on the same side. The positive and negative electrodes of the two middle batteries 401 are connected to each other by a connecting bus bar 50. The negative electrode of the outermost battery 401 facing away from the positive bus bar 202 is connected to the positive electrode of the adjacent battery 401 via a connection bus bar 50. The positive and negative electrodes of the other two batteries 401 are also connected by a connecting bus bar 50 to form the circuit. However, the connection of the connection bus bar 50 is not only performed in this manner, but depends on the actual application.In one embodiment, the positive busbar 202, the negative busbar 203, and the connection busbar 50 are made of aluminum, but are not limited thereto, and serve to collect, bundle, or transfer the current of the battery module 40.In one embodiment, a shunt is integrated on the printed circuit board 201, via which the current is forwarded to the first connection block 1011 or to the second connection block 1012.In the present embodiment, the positive and negative electrodes of the battery 401 are located on the same side of the battery 401. The flexible circuit board 204 includes a first flexible circuit board 2041 connected to each of the positive bus bar 202, the negative bus bar 203, the battery module 40, and the circuit board 201.Specifically, when the positive and negative electrodes of the battery 401 are located on the same side of the battery 401, the first flexible board 2041 is disposed on the same side as the positive and negative electrodes of the battery 401. This facilitates connection of the first flexible circuit board 2041 to the battery module 40.In an optional embodiment of the present application, the positive and negative electrodes of the battery 401 are located at the 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 connected to each of the positive bus bar 202, the negative bus bar 203, the battery module 40, and the circuit board 201, while the second flexible circuit board 2042 is connected to each of the connection bus bar 50, the battery module 40, and the circuit board 201. The connection is made by, for example, soldering, but is not limited thereto.The first flexible circuit board 2041, the positive busbar 202 and the negative busbar 203 are located on the same side of the circuit board 201, while the second flexible circuit board 2042 is arranged on the side of the circuit board 201 facing away from the first flexible circuit board 2041.Specifically, the second flexible circuit board 2042 is, for example, a flexible printed circuit (FPC), and is located on the opposite side of the first flexible circuit board 2041, both circuit boards being positioned on opposite sides of the circuit board 201. The second flexible circuit board 2042 serves to detect the voltage and temperature of the battery module 40.Please refer to FIGS. 4A and 4B. In an optional embodiment of the present application, the battery pack 100 includes: a case 10 including an upper cover 101 and a lower cover 102 arranged along the first direction Y. The upper cover 101 and the lower cover 102 form an accommodation space in which the battery module 40, the battery management component 20, and the resin holder 30 are disposed inside the accommodation space along the first direction Y.Specifically, the circuit board 201 is located near the upper cover 101, the battery module 40 is positioned near the lower cover 102, and the resin holder 30 is located between the circuit board 201 and the battery module 40.Further, the upper cover 101 and the lower cover 102 may be mechanically connected to each other. In an embodiment, the upper cover 101 and the lower cover 102 are connected by screws, for example, but this is not limited thereto and depends on the actual application.Moreover, on the side of the upper cover 101 facing away from the battery module 40, a first terminal strip 1011 and a second terminal strip 1012 are provided. For example, the first terminal board 1011 and the second terminal board 1012 are mounted on the upper cover 101, and a part of the first terminal board 1011 and the second terminal board 1012 also passes through the upper cover 101 and are connected to the circuit board 201.Specifically, the first terminal strip 1011 is located above the positive bus bar 202 along the first direction Y, and the first terminal strip 1011 forms a circuit together with the positive bus bar 202 via the circuit board 201, which circuit, for example, transmits power to an external device. The second terminal bar 1012 is located above the negative bus bar 203 along the first direction Y and forms a circuit with the negative bus bar 203 via the circuit board 201.Specifically, the first terminal strip 1011 and the second terminal strip 1012 are made of metal, for example, copper, but are not limited thereto. The first and second terminal blocks 1011 and 1012 serve to transmit current, voltage, or temperature of the battery module 40, for example. In one embodiment, the first and second terminal blocks 1011 and 1012 are located on and partially penetrate the top cover 101 while being soldered to the circuit board 201 to form a current path. The current is transmitted to the first terminal blocks 1011 and the second terminal blocks 1012 via the positive and negative bus bars 202 and 203, and then is transmitted to external devices.In an optional embodiment of this application, the top cover 101 has a plurality of recessed mounting slots 1016 on the side facing the battery module 40. A part of the first terminal strip 1011 and the second terminal strip 1012 is arranged in the mounting slots 1016, respectively, along the first direction Y, while the other part of the first terminal strip 1011 and the second terminal strip 1012 is connected to the printed circuit board 201 through the mounting slots 1016.Specifically, in one embodiment, the number of mounting slots 1016 is, for example, two, but this is not limited thereto and may vary depending on the actual application. The mounting slots 1016 are recessed along the first direction Y toward the side facing the battery module 40, which facilitates mounting of the first terminal strip 1011 and the second terminal strip 1012 and reduces the risk of damage to the terminal strips 1011 and 1012 during mounting or transport.In an optional embodiment of this application, the top cover 101 further includes a first output pin 1013 and a second output pin 1014 located within the mounting slots 1016. The first output bolt 1013 is connected to the first terminal strip 1011 on the side facing away from the battery module 40, while the second output bolt 1014 is connected to the second terminal strip 1012 on the side facing away from the battery module 40.In the related art, the terminal strips are also connected to an intermediate copper connector, which in turn is connected to the output pins. The intermediate copper connector is fastened to the terminal strips by means of screws. In the present embodiment, on the other hand, the first terminal strip 1011 and the second terminal strip 1012 are directly connected to the first output bolt 1013 and the second output bolt 1014, respectively, thereby omitting the intermediate copper connector. The first terminal block 1011 and the second terminal block 1012 are respectively directly soldered to the first output bolt 1013 and the second output bolt 1014, so that bolts and nuts are omitted, which reduces the cost and simplifies the assembly.Specifically, the first output bolt 1013 and the second output bolt 1014 serve as a locking connection to establish a firm connection with an external vehicle or other equipment.In an optional embodiment of this application, the mounting slot 1016 has a mounting height along the first direction Y. The portion of the first terminal block 1011 inserted into the mounting slot 1016, which is connected to the first output bolt 1013, has a first arrangement height in cross section along the first direction Y. The portion of the second terminal block 1012 inserted into the mounting slot 1016, which is connected to the second output bolt 1014, has a second arrangement height. The first arrangement height and the second arrangement height are less than or equal to the installation height.Specifically, the mounting slot 1016 extends along the first direction Y and has a mounting height on the side facing the battery module 40. The two mounting slots 1016 are configured to receive the first terminal block 1011 and the first output pin 1013, and the second terminal block 1012 and the second output pin 1014, respectively. The end of the first output bolt 1013 and / or of the second output bolt 1014 facing away from the battery module 40 is either flush with the side of the upper cover 101 facing away from the battery module 40 or lies below this side of the upper cover 101 facing away from the battery module 40. This reduces the risk of the first output pin 1013 and / or the second output pin 1014 being damaged or bent during assembly or transport.In an optional embodiment of this application, the top cover 101 additionally comprises a communication connector 1015 comprising a receptacle 10151 and pins 10152. The connector socket 10151 is located on the side of the upper cover 101 facing away from the battery module 40, wherein a part of the terminal pins 10152 is located in the connector socket 10151 and can establish an electrical connection with an external communication connector, while the other part penetrates the upper cover 101 and is connected to the printed circuit board 201.Specifically, the number of the terminal pins 10152 is four, for example. One part of the terminal pins 10152 is connected to an external communication connector, the other part penetrates the female connector 10151, and is soldered to the circuit board 201. In the relevant art, two connectors are usually used which are connected via an adapter cable string, the adapter cable string having at both ends adapter plugs which are respectively connected to the connectors. In this embodiment of the application, the connector 10151 is soldered to the top cover 101, the connector pins 10152 are integrated in the connector 10151 and connected to the circuit board 201. This eliminates the need for an adapter harness, adapter plugs, an additional adapter connector, and bolts and nuts to secure the adapter, thereby reducing costs and simplifying assembly.In an optional embodiment of this application, the top cover 101, the first terminal block 1011, the second terminal block 1012, the first output bolt 1013, the second output bolt 1014, and the communication connector 1015 are integrally injection molded, which reduces the cost and facilitates assembly of the battery pack.In another embodiment, the circuit board 201, the upper cover 101, and the lower cover 102 are arranged in parallel to each other. The positive bus bar 202, the negative bus bar 203, and the flexible circuit board 204 extend into the accommodation space from the periphery of the circuit board 201 along the first direction Y and connect to the battery module 40.In one embodiment, the third direction Z is oriented perpendicular to the first direction Y and the second direction X. A plurality of batteries 401 are arranged along the second direction X, wherein the positive and negative electrodes of the batteries 401 are positioned along the third direction Z at one end or at opposite ends of the batteries 401. This arrangement enables the batteries 401 to be placed horizontally, thereby reducing the overall height of the battery pack. Since the poles of the horizontally disposed batteries 401 are laterally located, the flexible circuit board 204 extends from the side and connects to the battery module 40, which facilitates the assembly of the flexible circuit board 204.In an embodiment according to FIG. 5, a plurality of recessed receiving slots 1021 are provided on the side of the lower cover 102 facing the battery module 40. These receiving slots 1021 are arranged along the second direction X, and the batteries are also placed in the receiving slots 1021 along this direction X.More specifically, the lower cover 102 has a plurality of housing plates enclosing a chamber. The accommodation slits 1021 are located on the side of the lower cover 102 facing the battery module 40 and inside the chamber to accommodate the batteries 401.In addition, the lower cover 102 may have a connector terminal to connect to external devices.As illustrated in FIG. 6, in another embodiment of the application, the resin holder 30 includes a plurality of fixing portions 301 arranged along the second direction X. The fixing portions 301 are located on the side of the resin holder 30 facing the battery module 40, and correspond one by one to the batteries 401. The fixing portions 301 are designed to partially enclose and fix the batteries 401.Specifically, the fixing portion 301 and the resin holder 30 are integrally formed. The number of the receiving slits 1021 and the fixing portion 301 corresponds to the number of the batteries 401. In one embodiment, the batteries 401 are cylindrical and the receiving slots 1021 are recessed on the side of the bottom cover 102 opposite the battery module 40 to receive the batteries 401 and prevent movement thereof within the battery pack 100, which improves the performance and safety of the battery pack 100. The attachment portions 301 are provided, on the side of the resin holder 30 facing the battery module 40, with a storage space in which the batteries 401 are partially stored. The side of the attachment portion 301 facing the battery module 40 is formed, for example, in an arc shape to provide a suitable space for the batteries 401, with the center of the arc being located, for example, on the side of the lower cover 102. The accommodation space is matched with the size of the batteries 401, and cooperates with the lower cover 102 to fix the batteries 401. In one embodiment, a partition wall is provided between two adjacent batteries 401, which is integrally formed with the resin holder 30 to prevent short circuits between the batteries.In one embodiment, the plastic mount 30 is mechanically connected to the circuit board 201. More specifically, the resin holder 30 has a plurality of bolts, while the circuit board 201 is provided with a plurality of nuts fitting thereto, thereby establishing a mechanical connection for fixing the resin holder 30 to the circuit board 201. The number of bolts and nuts is not limited in this application and is adapted to the respective practical requirements.In one embodiment, the resin holder 30 is mechanically connected to the top cover 101 by, for example, a screw connection, but this type of fastening is not limited and also depends on practical application.In an optional embodiment of this application, the circuit board 201 is soldered to the housing 10. In this case, the printed circuit board 201 is partly soldered to the first terminal strip 1011 and the second terminal strip 1012 of the housing 10.The battery pack 100 provided in this application includes the battery module 40 and the battery management component 20 connected to the battery module 40. The battery management component 20 includes the circuit board 201, the positive bus bar 202, the negative bus bar 203, and the flexible circuit board 204. Here, one end of the positive current collector 202 and the negative current collector 203 is connected to the battery module 40, while the other end is connected to the circuit board 201. The flexible circuit board 204 connects the positive bus bar 202, the negative bus bar 203, the battery module 40, and the circuit board 201 to each other. This saves transition plug connectors and other materials, which significantly reduces the production and assembly costs of the battery pack and leads to a cost reduction and to a simplification of the assembly.

Claims

A battery pack, comprising: a battery module (40); and a battery management component (20) connected to the battery module (40), wherein the battery management component (20) comprises a circuit board (201), a positive bus bar (202), a negative bus bar (203), and a flexible circuit board (204); wherein one end of the positive bus bar (202) and the negative bus bar (203) are connected to the battery module (40), and another end of the positive bus bar (202) and the negative bus bar (203) is connected to the circuit board (201), wherein the flexible circuit board (204) is connected to the positive bus bar (202), the negative bus bar (203), the battery module (40), and the circuit board (201), respectively.The battery pack of claim 1, wherein the battery pack comprises: a resin holder (30) disposed between the circuit board (201) and the battery module (40) along a first direction; the battery module (40) comprising a plurality of batteries (401) disposed along a second direction, the second direction crossing the first direction, the batteries (401) each comprising a positive electrode and a negative electrode, the positive bus bar (202) being connected to the positive electrode of the first or last battery (401) along the second direction, and the negative bus bar (203) being connected to the negative electrode of the first or last battery (401) along the second direction.The battery pack according to claim 2, wherein the resin holder (30) is further provided with a plurality of connection bus bars (50), the positive bus bar (202) and the negative bus bar (203) being connected to the positive electrode and the negative electrode of the batteries (401), respectively, the connection bus bars (50) connecting the positive electrode of one of the adjacent batteries (401) to the negative electrode of the other.The battery pack according to any one of claims 1-3, wherein the flexible circuit board (204) comprises a first flexible circuit board (2041), wherein the positive electrode of the battery (401), the negative electrode of the battery (401), and the first flexible circuit board (2041) are disposed on the same side, wherein 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 circuit board (201), respectively.The battery pack of any one of claims 1-3, wherein the positive electrode and the negative electrode of the battery (401) are disposed at opposite ends of the battery (401), the flexible circuit board (204) comprises a first flexible circuit board (2041) and a second flexible circuit board (2042), wherein 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 circuit board (201), respectively, and wherein the second flexible circuit board (2042) is connected to the connection bus bar (50), the battery module (40), and the circuit board (201), respectively, 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 circuit board (201), while the second flexible printed circuit board (2042) is arranged on the side of the printed circuit board (201) facing away from the first flexible printed circuit board (2041).The battery pack according to any one of claims 3-5, wherein the battery pack comprises: 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 chamber, wherein the battery module (40), the battery management component (20), and the resin holder (30) are arranged in the receiving chamber along the first direction, wherein a first terminal strip (1011) and a second terminal strip (1012) are arranged on the side of the upper cover (101) facing away from the battery module (40), wherein a part of the first terminal strip (1011) and a part of the second terminal strip (1012) pass through the upper cover (101) and are connected to the circuit board (201).The battery pack according to claim 6, wherein the top cover (101) is provided with a plurality of mounting recessed slots (1016) on the side facing the battery module (40) along the first direction, a part of the first terminal block (1011) and the second terminal block (1012) along the first direction are respectively disposed in the mounting slots (1016), and another part of the first terminal block (1011) and the second terminal block (1012) passes through the mounting slots (1016) and is connected to the circuit board (201).The battery pack of claim 7, wherein the top cover (101) further comprises: a first output bolt (1013) and a second output bolt (1014) located in the mounting slot (1016), wherein the first output bolt (1013) is connected to the side of the first terminal block (1011) opposite the battery module (40), and the second output bolt (1014) is connected to the side of the second terminal block (1012) opposite the battery module (40).The battery pack of claim 8, wherein the mounting slot (1016) has a mounting height along the first direction, wherein the portion of the first terminal block (1011) in the mounting slot (1016) after connection to the first output pin (1013) has a first arrangement height in cross section along the first direction, and the portion of the second terminal block (1012) in the mounting slot (1016) after connection to the second output pin (1014) has a second arrangement height in cross section along the first direction, wherein the first arrangement height and the second arrangement height are each less than or equal to the mounting height.The battery pack according to claim 8 or 9, wherein the top cover (101) further comprises: a communication connector (1015) comprising a connector socket (10151) and connector pins (10152), wherein the connector socket (10151) is disposed on the side of the top cover (101) opposite to the battery module (40), a part of the connector pins (10152) is located in the connector socket (10151), and another part of the connector pins (10152) passes through the top cover (101) and is connected to the circuit board (201).The battery pack of claim 10, wherein the top cover (101) is integrally formed with the first terminal block (1011), the second terminal block (1012), the first output bolt (1013), the second output bolt (1014), and the communication connector (1015) by injection molding.The battery pack according to any one of claims 6-11, wherein the circuit board (201) is disposed parallel to the top cover (101) and the bottom cover (102), wherein the positive busbar (202), the negative busbar (203), and the flexible circuit board (204) project into the accommodation chamber from the edge of the circuit board (201) along the first direction and are connected to the battery module (40), wherein the positive electrodes and negative electrodes of the plurality of batteries (401) are respectively located at one end or at opposite ends of the battery (401) along a third direction, wherein the third direction intersects both the first direction and the second direction.The battery pack according to any one of claims 6 - 12, wherein the lower cover (102) is provided with a plurality of accommodation slots (1021) on the side facing the battery module (40), the accommodation slots (1021) being arranged along the second direction, and the batteries (401) being arranged along the second direction in the accommodation slots (1021).The battery pack according to claim 13, wherein the resin holder (30) further comprises: a plurality of fixing portions (301) arranged along the second direction, the fixing portions (301) being arranged on the side of the resin holder (30) facing the battery module (40), and the plurality of fixing portions (301) respectively corresponding to the plurality of batteries (401), the fixing portions (301) being formed to enclose and fix parts of the batteries (401).The battery pack of any of claims 10-14, wherein the circuit board (201) is soldered to the housing (10).

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