Battery module

Abstract

The utility model relates to a battery module. The battery module comprises a battery cell assembly; the integrated busbar is arranged on one side of the battery cell assembly, and the integrated busbar is used for connecting each battery cell; the integrated busbar is provided with an acquisition unit and a conductive unit, the acquisition unit is connected to the battery cell and is used for acquiring an electric signal of the battery cell, and the conductive unit is connected with the battery cell and a power supply; and the battery management module is connected with the acquisition unit and is connected between the conductive unit and the power supply, and the battery management module is used for adjusting the magnitude of the voltage value obtained by each battery cell from the power supply according to the electric signal. The voltage input into the battery cell is controlled and adjusted according to the condition, the safety of the battery is ensured, the efficient and safe operation of the battery module can be ensured, and the service life of the battery module is further prolonged; and the acquisition unit and the conductive unit are integrated on the circuit board of the integrated busbar and are integrally designed with the integrated busbar, so that the light weight of the battery module and the battery pack is realized.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery modules. Background Technology

[0002] Power batteries have become one of the key technologies in the new energy vehicle field due to their high reliability and wide market application. In the design and manufacturing process of power batteries, the use of aluminum casings and top covers is due to their lightweight, high specific energy, and good safety performance. The design of the aluminum casing and top cover encapsulating the core not only provides the structural strength required for the battery but also contributes to the thermal management and stability of its electrochemical performance. In the battery top cover design, the positive and negative terminals are the key parts where the electrodes are led out; the positive electrode potential is typically maintained between 2V and 4.5V. During the charging and discharging process of a secondary battery, lithium ions move between the positive and negative electrodes. During charging, lithium ions move from the positive electrode to the negative electrode and undergo a lithium intercalation reaction with graphite, forming lithium-carbon compounds. However, when aluminum and graphite are used simultaneously as negative electrode materials, and aluminum is in contact with the negative electrode terminal or the aluminum of the negative electrode terminal is in contact with the electrolyte inside the battery, lithium ions preferentially undergo a lithium intercalation reaction with aluminum, forming an aluminum-lithium alloy, which leads to corrosion of the aluminum casing.

[0003] To prevent corrosion of the aluminum casing, the industry has adopted several measures. A common approach is to connect a large resistor in series between the positive electrode post and the top cover plate. This can be achieved by adding conductive glass fiber inside the plastic of the positive electrode post, or by leading a wire from the positive electrode post to the aluminum casing itself. This allows the top cover and aluminum casing to carry a positive charge, with a voltage greater than 1.5V, thereby preventing lithium ions from intercalating into aluminum and effectively protecting the aluminum casing from corrosion. However, even with this design, the weak conductivity between the aluminum casing and the negative electrode can still cause corrosion of the aluminum casing when a single battery cell short-circuits. Utility Model Content

[0004] Therefore, it is necessary to provide a battery module with high stability and high safety to address the aforementioned technical problems.

[0005] A battery module, comprising:

[0006] A battery cell assembly, comprising at least two battery cells;

[0007] An integrated busbar is disposed on one side of the battery cell assembly, and the integrated busbar is used to connect each of the battery cells; the integrated busbar has a data acquisition unit and a conductive unit, the data acquisition unit is connected to the battery cell and is used to acquire the electrical signal of the battery cell, and the conductive unit connects the battery cell and the power supply; and

[0008] A battery management module is connected to the acquisition unit and between the conductive unit and the power supply. The battery management module is used to adjust the voltage value obtained by each cell from the power supply according to the electrical signal.

[0009] In one embodiment, the battery management module is provided with the power supply, and / or the power supply is a power source located outside the battery module.

[0010] In one embodiment, the battery module further includes a switch element disposed between the conductive unit and the power supply, the switch element being able to selectively connect to the power supply under the control of the battery management module.

[0011] In one embodiment, the integrated busbar includes:

[0012] Body, the body being used to connect each of the battery cells; and

[0013] A circuit board is disposed within the body, and the circuit board includes the acquisition unit and the conductive unit.

[0014] In one embodiment, the conductive unit includes:

[0015] A power interface, wherein the power interface is used to connect the power supply; and

[0016] A power supply circuit, which is electrically connected to the battery cell and the power interface.

[0017] In one embodiment, the conductive unit includes:

[0018] The first terminal is electrically connected to the positive terminal of the battery cell;

[0019] Multiple second terminals are respectively connected to the top covers of multiple battery cells; and

[0020] A wire, wherein the first terminal and a plurality of second terminals are electrically connected to the wire;

[0021] The power supply is electrically connected to each of the battery cells through the first terminal, the wire, and a plurality of second terminals, so that the power supply provides a power supply potential to the battery cells.

[0022] In one embodiment, the conductive unit further includes a variable resistor disposed on the wire, and both the acquisition unit and the variable resistor are connected to the battery management module of the battery unit; wherein, the battery management module adjusts the resistance value of the variable resistor according to the electrical signals of each cell acquired by the acquisition unit.

[0023] In one embodiment, the integrated busbar connects each of the battery cells in series or in parallel.

[0024] In one embodiment, the cell assembly includes an aluminum casing and a top cover, the aluminum casing being used to house the cell, and the top cover being disposed at an open end of the aluminum casing.

[0025] In one embodiment, the electrical signal includes the voltage signal of each of the battery cells, wherein the voltage of the battery cells is 1.5V to 4.5V.

[0026] The battery module proposed in this application, by setting up a data acquisition unit and a conductive unit, can collect the electrical signals of the battery cluster in real time and upload them to the BMS. It can control and adjust the voltage of the input cells according to the situation, ensuring battery safety and ensuring the efficient and safe operation of the battery module, thereby extending the service life of the battery module. The data acquisition unit and the conductive unit are integrated on the circuit board of the integrated busbar, and are integrated with the integrated busbar design, which does not increase the size of the battery module and can still maintain the lightweight of the battery module and battery pack. Attached Figure Description

[0027] Figure 1 This is an exploded view of the battery cell and integrated busbar structure of a battery module in one embodiment.

[0028] Figure 2 This is a perspective view of the overall structure of the battery module in one embodiment;

[0029] Figure 3 This is a schematic diagram of the battery cell structure in one embodiment;

[0030] Figure 4 This is a schematic diagram of the integrated busbar structure in one embodiment;

[0031] Figure 5 This is a schematic diagram of the circuit board structure in one embodiment;

[0032] Figure 6 This is a schematic diagram of the integrated busbar near the battery cell side in one embodiment;

[0033] Figure 7 In one embodiment Figure 5 Enlarged view of region A in the middle;

[0034] Figure 8 This is a schematic diagram of the system connection of the battery module in one embodiment.

[0035] Explanation of icon numbers:

[0036] 100. Battery module;

[0037] 10. Battery cell assembly; 11. Battery cell; 111. Top cover; 112. Aluminum shell; 113. Positive terminal; 114. Negative terminal; 115. Top plastic coating;

[0038] 20. Integrated busbar; 21. Circuit board; 22. Body; 23. Conductive component; 210. Conductive unit; 211. First terminal; 212. Second terminal; 213. Wire; 24. Acquisition unit;

[0039] 30. Module housing;

[0040] 40. Battery management module; 41. Switching components;

[0041] 50. Power supply 50. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0043] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0048] See Figure 1-8 , Figure 1-8 A schematic diagram of the structure of a battery module 100 according to an embodiment of this application is shown. Figure 8As shown, an embodiment of this application provides a battery module 100, including a cell assembly 10, an integrated busbar 20, and a battery management module 40. The cell assembly 10 includes at least two cells 11. The integrated busbar 20 is disposed on one side of the cell assembly 10 and is used to connect each cell 11. The integrated busbar 20 has a data acquisition unit 24 and a conductive unit 210. The data acquisition unit 24 is connected to the cell 11 and is used to acquire electrical signals from the cell 11. The conductive unit 210 connects the cell 11 and a power supply 50. The battery management module 40 (BMS) is connected to the data acquisition unit 24 and is connected between the conductive unit 210 and the power supply 50. The battery management module 40 is used to adjust the voltage value acquired by each cell 11 from the power supply 50 according to the electrical signals.

[0049] The battery module 100 proposed in this application, by setting up a data acquisition unit 24 and a conductive unit 210, can acquire the electrical signals of the battery cluster in real time and upload them to the BMS. It can control and adjust the voltage of the input cell 11 according to the situation, ensuring the safety of the battery and ensuring the efficient and safe operation of the battery module 100, thereby extending the service life of the battery module 100. The data acquisition unit 24 and the conductive unit 210 are integrated on the circuit board 21 of the integrated busbar 20. They are integrated with the integrated busbar 20 and do not increase the volume of the battery module 100. The battery module 100 and the battery pack are still lightweight.

[0050] Specifically, the battery management module 40 and the cell assembly 10 are integrated into the module structure inside the battery module 100, or it can be a module structure that communicates with the cell assembly 10.

[0051] Specifically, the battery management module 40 can obtain the voltage on each cell 11 through the acquisition unit 24, thereby monitoring the voltage changes on each cell 11. When the voltage of one or more cells 11 is less than a preset minimum threshold or greater than a preset maximum threshold, the battery management module 40 controls the output voltage of the power supply 50 to increase or decrease, so that the voltage of one or more cells 11 returns to the preset voltage range, such as between 1.5V and 4.5V, thereby ensuring that the aluminum shell 112 of the cell 11 is not corroded, and at the same time the overall electrical performance of the battery module 100 is stable.

[0052] Multiple cells 11 of the battery cell assembly 10 are stacked sequentially along their own thickness direction. Optionally, the cell 11 is cuboid in shape. The cell 11 is illustrated as a square battery in the figure. The casing of the cell 11 includes two main surfaces, two side surfaces, and a top surface. Multiple cells 11 are stacked sequentially along their own thickness direction to form the battery cell assembly 10. The side surfaces of each cell 11 are arranged adjacent to each other in sequence. The casing of the cell 11 or the battery cell assembly 10 is set as an aluminum casing 112.

[0053] The adjacent cells 11 of the battery cell assembly 10 are tightly fitted together. The battery cell assembly 10 may or may not have a module housing 30, depending on the integration method of the battery module 100. When a module housing 30 is used, the module housing 30 has a rectangular or square shape, depending on the stacked shape of the battery cell assembly 10. The dimensions of the module housing 30 are set according to the number and specifications of the cells 11; that is, the length, width, and height of the module housing 30 should not be less than the stacked dimensions of the battery cell assembly 10 to ensure that the module housing 30 can accommodate all the cells 11 of the battery cell assembly 10. The cells 11 of the battery cell assembly 10 are kept parallel, and the two adjacent main surfaces of two adjacent cells 11 are tightly fitted together.

[0054] In one embodiment, the battery cell assembly 10 includes an aluminum shell 112 and a top cover 111. The aluminum shell 112 is used to house the battery cell 11, and the top cover 111 is disposed at the open end of the aluminum shell 112. Each aluminum shell 112 houses one battery cell 11, and each top cover 111 closes the open end of each aluminum shell 112.

[0055] The structural diagram of cell 11 is shown below. Figure 3 As shown, the battery cell 11 also includes a positive terminal 113 and a negative terminal 114. The positive terminal 113 and the negative terminal 114 of the battery cell 11 are respectively covered with insulating plastic 115. The plastic 115 corresponding to the positive terminal 113 and the negative terminal 114 of the battery cell 11 are respectively connected to the top cover 111 of the corresponding battery cell 11.

[0056] In one embodiment, each cell 11 includes two upper plastics 115, which respectively cover the outside of the positive terminal 113 and the negative terminal 114 of the cell 11. The upper plastics 115 are made of insulating material to provide electrical isolation and prevent the positive terminal 113 and the negative terminal 114 of the cell 11 from directly contacting the metal parts outside the cell 11 (such as the cell 11 housing or other cells 11). Each cell 11 has a top cover 111 on its upper surface. The top cover 111 is made of aluminum. The top cover 111 has a through hole for each corresponding positive terminal 113 and the corresponding negative terminal 114. The inner peripheral wall of each through hole is in close contact with the outer peripheral wall of the corresponding upper plastic 115. The insulating upper plastic 115 can be formed around the positive terminal 113 and the negative terminal 114 by injection molding and is also formed on the inner peripheral wall of the through hole.

[0057] Each battery cell 11 has its positive terminal 113 and negative terminal 114 covered with an upper plastic 115. The upper plastic 115 of each battery cell 11's positive terminal 113 and negative terminal 114 is connected to the corresponding top cover 111. This provides effective electrical insulation between the positive terminal 113 and negative terminal 114 of the battery cell 11 and the external metal components of the battery cell 11, thereby avoiding the risk of short circuits caused by direct contact between the positive terminal 113 and negative terminal 114 inside the battery cell 11. Simultaneously, covering the positive terminal 113 and negative terminal 114 of the battery cell 11 with plastic 115 also provides physical protection, effectively preventing damage or displacement of the positive terminal 113 and negative terminal 114 due to external impact or vibration during assembly, transportation, or use, thus preventing mechanical damage to the internal structure of the battery cell 11.

[0058] In one embodiment, the battery cell 11 further includes a lower plastic layer disposed below the top cover 111, which can further isolate the positive terminal 113 and the negative terminal 114 from contact with the top cover 111. On the other hand, the positive terminal 113 and the negative terminal 114 are electrically connected to the positive and negative terminals of the battery core respectively through an adapter (not shown). The lower plastic layer can isolate the positive and negative terminals of the battery core from contact with the top cover 111, thereby further preventing the positive terminal 113 and the negative terminal 114 from conductively connecting with the top cover 111.

[0059] In one embodiment, the battery management module 40 includes the power supply 50, and / or the power supply 50 is located outside the battery module 100. The power supply 50 provides potential to each battery cell 11 and each unit in the battery management module 40. When the power supply 50 is located outside the battery module 100, the power supply 50 can also charge the battery cells 11.

[0060] In one embodiment, the battery module 100 further includes a switch element disposed between the conductive unit 210 and the power supply 50, the switch element being able to selectively connect to the power supply 50 under the control of the battery management module 40.

[0061] Specifically, when the power supply 50 is only a built-in power supply in the battery management module 40, the switch can turn the connection between the conductive unit 210 and the power supply 50 on or off; when the power supply 50 is only an external power supply outside the battery module 100, the switch can turn the connection between the conductive unit 210 and the power supply 50 on or off; when the power supply 50 includes both a built-in power supply and an external power supply, in addition to turning the connection between the conductive unit 210 and the power supply 50 on or off, the switch can also switch the connection between the built-in power supply and the external power supply.

[0062] In one embodiment, the integrated busbar 20 includes: a body 22 for connecting each of the battery cells 11; and a circuit board 21 disposed within the body 22, the circuit board 21 including the acquisition unit 24 and the conductive unit 210.

[0063] Furthermore, the electrical signals acquired by the acquisition unit 24 can be signal data such as voltage, current or temperature. Specifically, they can include signal data such as the output voltage or output current of each cell 11, the charging voltage or charging current, the voltage of the aluminum shell 112, the temperature (or temperature distribution) of the core or stack inside the aluminum shell 112, and the temperature (or temperature distribution) outside the aluminum shell 112.

[0064] In some specific embodiments, NTC chips, thermistors, or temperature sensing wires can also be integrated on the circuit board 21 to monitor the temperature of each cell 11 and adjust the temperature of each cell 11 in a timely manner, thereby effectively regulating the overall temperature of the battery module 100 and ensuring the safety of the battery module 100 in operation.

[0065] The main body 22 is used to connect adjacent cells 11 and provide electrical physical support for the circuit board 21, so that the cells 11 and the circuit board 21 are fixed and stable within the battery module 100, avoiding displacement or vibration during use.

[0066] Optionally, the body 22 can be a plastic body 22 or other functional body 22. Specifically, the body 22 can also have a heat dissipation function, which can be achieved by adding conductive materials to the resin substrate of the body 22 or attaching heat sinks to the side of the resin body 22 near the conductive component 23 and / or the circuit board 21, to reduce the operating temperature of the battery module 100 and thus improve the stability of the battery module 100. Alternatively, the body 22 can have a low-temperature resistance function, which can be achieved by adding low-temperature resistant fiber materials to the resin substrate of the body 22 to increase the low-temperature toughness of the body 22, thereby increasing the operating temperature range of the battery module 100. The choice of material and shape of the body 22 can be determined according to actual product requirements, and this application does not impose any restrictions.

[0067] The circuit board 21 can be a printed circuit board (PCB), a flexible printed circuit (FPC), a flexible die-cutting circuit (FDC), or a flexible copper clad laminate (FCCL), etc., and there are no restrictions in this application.

[0068] In one embodiment, the integrated busbar 20 connects each of the battery cells 11 in series or in parallel. The integrated busbar 20 physically and electrically connects the battery cells 11, and the aforementioned body 22 can realize the physical connection of multiple battery cells 11.

[0069] In one embodiment, the integrated busbar 20 further includes a conductive element 23 for electrically connecting each of the battery cells 11 in series or in parallel.

[0070] Two adjacent battery cells 11 are connected in series via a conductive element 23, ensuring that current can flow from the positive terminal of one battery cell 11 to the negative terminal of the adjacent battery cell 11, thus forming a series structure. In this embodiment, the arrangement of the conductive element 23 enables the battery cell to operate efficiently and stably. Furthermore, when the positive terminals 113 and negative terminals 114 of two adjacent battery cells 11 are connected in parallel via the conductive element 23, the connection position of the conductive element 23 is adjusted to connect the positive terminals 113 and positive terminals 113, and the negative terminals 114 and negative terminals 114 of the two adjacent battery cells 11 through the conductive element 23, forming a parallel structure.

[0071] The number of conductive elements 23 depends on the number of terminals of the battery cell 11. Multiple conductive elements 23 are respectively set for the terminals of each battery cell 11. Each conductive element 23 is used to conductively connect the positive terminal 113 and the negative terminal 114 of two adjacent battery cells 11, or each conductive element 23 is used to conductively connect the two positive terminals 113 or the two negative terminals 114 of two adjacent battery cells 11, thereby realizing the series or parallel connection of two adjacent battery cells 11. The conductive elements 23 can be aluminum conductive elements 23, copper conductive elements 23, aluminum conductive elements 23 with nickel or copper plated surface, aluminum-copper alloy conductive elements 23, etc. The specific shape of the conductive elements 23 can be designed comprehensively based on various factors such as the overall structure of the integrated busbar 20, the structure of the substrate, the shape design of the circuit board 21, and the weight limit of the integrated busbar 20, and is not limited here.

[0072] The acquisition unit 24 is electrically connected to each conductive component 23 to acquire the electrical signal of each battery cell 11. The circuit board 21 is provided with connection terminals, and the acquisition unit 24 on the circuit board 21 is connected to each conductive component 23 through the connection terminals, thereby obtaining the electrical signal of each battery cell 11 through each conductive component 23.

[0073] In one embodiment, the conductive unit 210 includes: a power interface for connecting to the power supply 50; and a power supply circuit capable of conductively connecting to the battery cell 11 and the power interface.

[0074] In one embodiment, the conductive unit 210 includes: a first terminal 211 electrically connected to the positive terminal 113 of the power supply cell 11; a plurality of second terminals 212 respectively connected to the top cover 111 of the plurality of cells 11; and a wire 213, wherein the first terminal 211 and the plurality of second terminals 212 are electrically connected to the wire 213; wherein the power supply 50 is electrically connected to each cell 11 through the first terminal 211, the wire 213 and the plurality of second terminals 212, so that the power supply 50 provides a power supply potential to the cell 11.

[0075] The power interface includes a first terminal 211 and multiple second terminals 212, and the power supply circuit is the aforementioned wire 213.

[0076] The first terminal 211 is fixedly connected to the positive terminal 113 of the power supply cell 11. Optionally, the first terminal 211 and the positive terminal 113 of the power supply cell 11 can be electrically connected by welding, crimping, plugging, or other methods. The fixed connection between the first terminal 211 and the positive terminal 113 of the power supply cell 11 is used to conduct the positive potential of the power supply cell 11 to other circuit parts in the integrated busbar 20, such as the wires 213 and the second terminals 212. The first terminal 211 and the plurality of second terminals 212 are all electrically connected to the wires 213 to transfer the positive potential of the power supply cell 11 from the first terminal 211 to the plurality of second terminals 212.

[0077] Multiple second terminals 212 are configured one-to-one with the non-terminal areas of the top cover 111 of multiple battery cells 11. In some specific embodiments, the second terminals 212 are configured to correspond to the exposed aluminum areas of the top cover 111 of the corresponding battery cell 11, so that the second terminals 212 can directly contact the exposed aluminum areas, thereby realizing the electrical connection between the second terminals 212 and the top cover 111.

[0078] The conductors 213 are arranged along the length of the cell assembly 10 (i.e., the stacking direction of the cells 11), and conductors 213 are arranged on both sides of the circuit board 21 near the terminals of the cells 11. Multiple second terminals 212 are arranged on the conductors 213 at intervals along the length of the cell assembly 10. Each second terminal 212 corresponds to and contacts a top cover 111 of a cell 11, ensuring that the top cover 111 of each cell 11 can be electrically connected to the conductors 213 through the corresponding second terminal 212.

[0079] For example, the first terminal 211 of the conductive unit 210 is electrically connected to the positive terminal 113 of the power supply cell 11 to conduct the positive potential of the power supply cell 11 to the wire 213. At the same time, a plurality of second terminals 212 are electrically connected to the top cover 111 of each cell 11, and the plurality of second terminals 212 are all electrically connected to the wire 213, which can ensure that the top cover 111 of each cell 11 can make electrical contact with the conductive unit 210.

[0080] Specifically, through the connection of wire 213, the first terminal 211 can transfer the positive potential of the power supply cell 11 to each second terminal 212, and each second terminal 212 can then conduct the potential to the top cover 111 of its corresponding cell 11.

[0081] Furthermore, the conductor 213 can be an aluminum wire, copper wire, aluminum-copper alloy wire, or aluminum foil strip, copper foil strip, etc.; for example, the circuit board 21 can be a flexible circuit board 21, and the conductor 213 is formed in the substrate of the flexible circuit board 21.

[0082] The first terminal 211 and the second terminal 212 are electrically connected to the wires 213 in the circuit board 21. The specific structure of the first terminal 211 and the second terminal 212 is not limited. For example, the first terminal 211 and the second terminal 212 can be solder points formed on the circuit board 21, conductive terminals formed on the circuit board 21 by surface mounting, or conductive blocks soldered on the circuit board 21, etc.

[0083] The conductive unit 210 is integrated on the circuit board 21, that is, the first terminal 211, multiple second terminals 212 and wires 213 are all integrated on the circuit board 21. The integrated structure of the circuit board 21 ensures that the battery module 100 does not increase in components, thus avoiding an increase in volume and weight, thereby ensuring the lightweight of the battery module 100.

[0084] In one embodiment, the conductive unit 210 further includes a variable resistor disposed on the wire 213, and both the acquisition unit 24 and the variable resistor are connected to the battery management module 40 of the battery unit; wherein, the battery management module 40 adjusts the resistance value of the variable resistor according to the electrical signals of each of the battery cells 11 acquired by the acquisition unit 24.

[0085] Both the acquisition unit 24 and the variable resistor are connected to the battery management module 40. The battery management module 40 receives electrical signals transmitted from the acquisition unit 24 to monitor the operating status of each cell 11 in the battery module 100 in real time. Based on the acquired electrical signals, the battery management module 40 determines whether each cell 11 is in normal working condition and whether there are any abnormalities such as overcharging, over-discharging, or abnormal temperature. Then, based on this information, the battery management module 40 adjusts the resistance value of the variable resistor, thereby adjusting the potential of the aluminum casing 112 corresponding to each cell 11.

[0086] In this embodiment, a variable resistor is connected to the wire 213. The acquisition unit 24 and the variable resistor are both connected to the battery management module 40. By adjusting the resistance value of the variable resistor, the battery management module 40 can accurately adjust the potential of the aluminum shell 112 and the top cover 111 of the battery cell 11. The appropriate potential can ensure that the aluminum shell 112 of the battery cell 11 has the correct potential, thereby avoiding corrosion of the aluminum shell 112 due to electrochemical reactions (such as lithium-ion intercalation reaction), and thus effectively improving the battery's service life and safety.

[0087] In one embodiment, the electrical signal includes the voltage signal of each of the battery cells 11, wherein the voltage of the battery cell 11 is 1.5V to 4.5V.

[0088] For example, the voltage of cell 11 can be 1.5V, 2V, 2.5V, 3V, 3.5V, 4V, 4.5V, etc., but is not limited to this. The voltage of cell 11 can be greater than 4.5V. However, from the perspective of saving power consumption, the voltage of cell 11 should not be too high for graphite negative electrode, and should preferably not exceed 5V.

[0089] In some preferred embodiments, the minimum voltage of cell 11 may also be less than 1.5V. Specifically, in lithium anode batteries, the voltage of cell 11 may be less than 1.5V, but is still preferably greater than 1.3V; in other embodiments, such as in graphite anode batteries, the voltage of cell 11 is preferably greater than or equal to 2V to prevent lithium ions from depositing on the aluminum casing 112 of cell 11.

[0090] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery module, characterized in that, include: A battery cell assembly, comprising at least two battery cells; An integrated busbar is disposed on one side of the battery cell assembly, and the integrated busbar is used to connect each of the battery cells; the integrated busbar has a data acquisition unit and a conductive unit, the data acquisition unit is connected to the battery cell and is used to acquire the electrical signal of the battery cell, and the conductive unit connects the battery cell and the power supply; and A battery management module is connected to the acquisition unit and between the conductive unit and the power supply. The battery management module is used to adjust the voltage value obtained by each cell from the power supply according to the electrical signal.

2. The battery module according to claim 1, characterized in that, The battery management module is equipped with the power supply, and / or the power supply is a power source located outside the battery module.

3. The battery module according to claim 2, characterized in that, The battery module also includes a switch, which is located between the conductive unit and the power supply. The switch can selectively connect to the power supply under the control of the battery management module.

4. The battery module according to claim 1, characterized in that, The integrated busbar includes: Body, the body being used to connect each of the battery cells; and A circuit board is disposed within the body, and the circuit board includes the acquisition unit and the conductive unit.

5. The battery module according to claim 1, characterized in that, The conductive unit includes: A power interface, wherein the power interface is used to connect the power supply; and A power supply circuit, which is electrically connected to the battery cell and the power interface.

6. The battery module according to claim 1, characterized in that, The conductive unit includes: The first terminal is electrically connected to the positive terminal of the battery cell; Multiple second terminals are respectively connected to the top covers of multiple battery cells; and A wire, wherein the first terminal and a plurality of second terminals are electrically connected to the wire; The power supply is electrically connected to each of the battery cells through the first terminal, the wire, and a plurality of second terminals, so that the power supply provides a power supply potential to the battery cells.

7. The battery module according to claim 6, characterized in that, The conductive unit also includes a variable resistor disposed on the wire. Both the acquisition unit and the variable resistor are connected to the battery management module of the battery unit. The battery management module adjusts the resistance value of the variable resistor according to the electrical signals of each cell acquired by the acquisition unit.

8. The battery module according to claim 1, characterized in that, The integrated busbar connects each of the battery cells in series or in parallel.

9. The battery module according to claim 1, characterized in that, The battery cell assembly includes an aluminum shell and a top cover. The aluminum shell is used to house the battery cell, and the top cover is disposed at the open end of the aluminum shell.

10. The battery module according to claim 1, characterized in that, The electrical signal includes the voltage signal of each of the battery cells, and the voltage of each battery cell is 1.5V to 4.5V.

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