Battery module and battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery module and a battery pack, the battery module comprises a plurality of battery cells, the plurality of battery cells are stacked and arranged along the thickness direction of the battery cells, and each battery cell comprises an aluminum shell and a top cover; wherein at least one of the plurality of battery cells is a power supply battery cell; the integrated busbar is arranged on the plurality of battery cells, the integrated busbar comprises a circuit board, an acquisition circuit and a conductive circuit are integrated on the circuit board, and the conductive circuit comprises a first terminal, a wire and a plurality of second terminals; and the power supply battery cell is electrically connected with the top cover corresponding to each battery cell through the first terminal, the lead and the plurality of second terminals, so that the power supply battery cell provides power supply potential for the top cover corresponding to each battery cell and the aluminum shell. According to the battery module provided by the invention, the power supply battery cells in the battery module provide potential for the top covers and the aluminum shells of all the battery cell aluminum shells in the battery module, so that the electrification stability of the battery cell aluminum shells is ensured, the corrosion of the aluminum shells is further effectively inhibited, and the reliability of a power battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery module and a battery pack. Background Art

[0002] The battery module is the core component of the power battery. The battery module is composed of multiple battery cells. The battery cell is usually composed of a positive electrode, a negative electrode, and an electrolyte. The battery cell is responsible for storing and releasing electrical energy. The aluminum shell and top cover are the external packaging parts of the battery cell, which are responsible for protecting the internal structure of the battery cell, ensuring the safety of the battery cell and improving its performance.

[0003] The positive and negative poles are the lead-out parts of the battery cell electrodes, and the positive electrode potential is usually between 2V and 4.5V. During the charging stage of the power battery, lithium ions migrate from the electrolyte to the graphite material of the negative electrode and enter the gaps in the graphite layer. At this time, the lithium ions will undergo a lithium insertion reaction between the negative electrode and the graphite to form lithium-carbon compounds. However, since the lithium insertion potential of aluminum is relatively low, only slightly higher than the lithium insertion potential of graphite, if the aluminum shell in the battery is not insulated from the electrochemical reaction system, it will exist as a negative electrode at the same time as graphite in the electrochemical reaction; therefore, when the aluminum shell contacts the negative pole, or the aluminum shell contacts the electrolyte inside the battery cell, the lithium ions will preferentially undergo a lithium insertion reaction with the aluminum to form an aluminum-lithium alloy, which will cause the aluminum shell of the battery cell to corrode. This corrosion phenomenon seriously affects the service life and reliability of the power battery.

[0004] In traditional technology, in order to prevent the aluminum shell of the battery cell from corroding, a large resistor is connected in series between the positive electrode and the top cover, and conductive glass fiber is added to the plastic above the positive electrode, so that the top cover and the aluminum shell are positively charged and the voltage reaches above 1.5V, thereby effectively preventing lithium ions from reacting with aluminum and avoiding corrosion of the aluminum shell.

[0005] However, this traditional method has certain defects. When the power battery is subjected to external forces, the plastic parts above the positive pole may become loose, rotate or deform, causing the conductivity between the positive pole and the top cover to change, which in turn causes the aluminum shell to be unable to maintain a sufficient positive voltage, making it easy for lithium ions to react with aluminum, resulting in the inability to effectively inhibit the corrosion of the aluminum shell. During the use of the power battery, the insulating film on the inner wall of the aluminum shell may be punctured or worn, and the aluminum shell will form a weak conductor with the negative electrode, causing the aluminum shell to corrode. Utility Model Content

[0006] Based on this, it is necessary to provide a battery module and battery pack that can ensure the charging stability of the aluminum shell of the battery cell and effectively inhibit the corrosion of the aluminum shell in response to the above-mentioned technical problems.

[0007] In a first aspect, the present application provides a battery module, comprising:

[0008] A battery unit, comprising a plurality of battery cells, wherein the plurality of battery cells are stacked and arranged along the thickness direction of the battery cells; each battery cell comprises an aluminum shell and a top cover, wherein the top cover is arranged at an open end of the aluminum shell; wherein at least one of the plurality of battery cells is a power supply battery cell; and

[0009] The integrated busbar is arranged on a plurality of cells. The integrated busbar includes a circuit board, on which a collection circuit and a conductive circuit are integrated; the collection circuit can collect the electrical signals of each cell, and the conductive circuit includes:

[0010] A first terminal electrically connected to the positive electrode of the power supply cell;

[0011] A plurality of second terminals are connected to the top covers of the plurality of battery cells in a one-to-one correspondence; and

[0012] A wire, a first terminal and a plurality of second terminals are all electrically connected to the wire;

[0013] The power supply cell is electrically connected to the top cover corresponding to each cell through the first terminal, the wire and the plurality of second terminals, so that the power supply cell provides a power supply potential for the top cover and the aluminum shell corresponding to each cell.

[0014] In one embodiment, the electrical signal of each battery cell includes a voltage signal of an aluminum shell of each battery cell, and the voltage of the aluminum shell of each battery cell is 1.5V~4.5V.

[0015] In one embodiment, the wires are arranged on the circuit board and are arranged corresponding to the stacking arrangement direction of the battery cells;

[0016] A plurality of second terminals are arranged on the wire at intervals along the extension direction of the wire;

[0017] Wherein, a plurality of second terminals can be respectively contacted and connected with the top covers of a plurality of the battery cells.

[0018] In one embodiment, the second terminal includes a resilient contact, and the resilient contact is used to abut against a top cover of the battery cell;

[0019] Wherein, a side of the elastic contact close to the top cover is set as a frosted surface or a serrated surface.

[0020] In one of the embodiments, the first terminal is arranged corresponding to the positive electrode column of the power supply cell, and the first terminal is fixedly connected to the positive electrode column of the power supply cell.

[0021] In one embodiment, the circuit board further comprises:

[0022] The battery module includes two power supply cells and two first terminals;

[0023] Among them, two first terminals corresponding to the positive poles of two power supply cells are arranged on the wire at intervals, and the two first terminals are correspondingly connected to the positive poles corresponding to the two power supply cells.

[0024] In one of the embodiments, the acquisition circuit is connected to a battery management system of the battery unit, and the battery management system can adjust the output voltage of the power supply cell according to the electrical signal of each cell acquired by the acquisition circuit.

[0025] In one of the embodiments, a variable resistor is connected to the wire, and both the acquisition circuit and the variable resistor are connected to a battery management system of the battery unit; wherein the battery management system can adjust the resistance value of the variable resistor according to the electrical signal of each battery cell acquired by the acquisition circuit.

[0026] In one of the embodiments, the positive electrode column and the negative electrode column of each battery cell are respectively covered with an insulating upper plastic, and the insulating upper plastic corresponding to the positive electrode column and the negative electrode column of each battery cell is respectively connected to the corresponding top cover of the battery cell.

[0027] In a second aspect, the present application provides a battery pack, comprising any one of the battery modules provided in the first aspect, and the battery pack also includes a battery management system.

[0028] The above-mentioned battery module and battery pack, the battery module includes: a battery unit, including a plurality of battery cells, and the plurality of battery cells are stacked and arranged along the thickness direction of the battery cells; each battery cell includes an aluminum shell and a top cover, and the top cover is arranged at the open end of the aluminum shell; wherein, at least one of the plurality of battery cells is a power supply battery cell; and an integrated busbar, arranged on the plurality of battery cells, the integrated busbar includes a circuit board, and the circuit board is integrated with a collection circuit and a conductive circuit; the collection circuit can collect the electrical signals of each battery cell, and the conductive circuit includes: a first terminal, electrically connected to the positive pole of the power supply battery cell; a plurality of second terminals, respectively connected to the top covers of the plurality of battery cells in a one-to-one correspondence; and a wire, the first terminal and the plurality of second terminals are electrically connected to the wire; wherein, the power supply battery cell is electrically connected to the top cover corresponding to each battery cell through the first terminal, the wire and the plurality of second terminals, so that the power supply battery cell provides a power supply potential for the top cover and the aluminum shell corresponding to each battery cell. The battery module proposed in the present application uses the power supply cells in the battery module to provide a potential for the top covers and aluminum shells of all the battery cell aluminum shells in the battery module, thereby ensuring the electrical stability of the battery cell aluminum shells, thereby effectively inhibiting the corrosion of the aluminum shells and improving the service life and reliability of the power battery; at the same time, the power supply cells and the top covers of each battery cell are electrically connected by conductive circuits, and the conductive circuits are integrated on the circuit board of the integrated busbar. The integrated design with the integrated busbar does not increase the volume of the battery module additionally, and can still maintain the lightweight of the battery module and the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 An exploded schematic diagram of a battery cell and an integrated busbar of a battery module in one embodiment;

[0031] Figure 2 A schematic diagram of the overall structure of a battery module in one embodiment;

[0032] Figure 3 A schematic diagram of the structure of a battery cell in one embodiment;

[0033] Figure 4 A schematic diagram of the structure of an integrated busbar in an embodiment;

[0034] Figure 5 is a schematic diagram of the structure of a circuit board in one embodiment;

[0035] Figure 6 This is a schematic diagram of the structure of an integrated busbar close to a battery unit in one embodiment;

[0036] Figure 7 In one embodiment Figure 5 A magnified image of area A;

[0037] Figure 8 In one embodiment Figure 5 Enlarged view of area B;

[0038] Fig. 9 is a schematic diagram of the connection between the second terminal and the top cover in one embodiment;

[0039] Fig.10 A schematic diagram of the circuit connection between a battery management system and a battery cell in one embodiment;

[0040] Fig.11 FIG. 4 is a circuit connection diagram of a variable resistor in an embodiment.

[0041] 100. Battery module;

[0042] 10. Battery cell; 11. Battery cell; 12. Power supply battery cell; 13. Battery management system; 111. Top cover; 112. Aluminum shell; 113. Positive pole; 114. Negative pole; 115. Upper plastic; 116. Lower plastic; 117. Roll core; 118. Positive ear; 119. Negative ear;

[0043] 20. Integrated busbar; 21. Circuit board; 22. Base plate;

[0044] 23. Conductive member; 210. Conductive circuit; 211. First terminal; 212. Second terminal; 213. Conductor; 214. Connecting terminal; 215. Collecting circuit; 216. Variable resistor; 2120. Elastic contact; 2121. Elastic member; 2122. Butt joint; 2123. Contact surface;

[0045] 30. Module housing. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0052] In a first aspect, the utility model provides a battery module.

[0053] See also Figures 1 to 4 , Figure 1 The figure shows an exploded schematic diagram of a battery cell 10 and an integrated busbar 20 of a battery module 100 in an embodiment of the present invention. Figure 2 A schematic diagram showing the overall structure of the battery module 100 is shown. Figure 3 shows a schematic structural diagram of the battery cell 11, Figure 4The structure diagram of the integrated busbar 20 is shown. The battery module 100 provided by an embodiment of the utility model includes a battery unit 10 and an integrated busbar 20. The battery unit 10 includes a plurality of battery cells 11, and the plurality of battery cells 11 are stacked and arranged along the thickness direction of the battery cells 11; each battery cell 11 includes an aluminum shell 112 and a top cover 111, and the top cover 111 is arranged at the open end of the aluminum shell 112; wherein at least one of the plurality of battery cells 11 is a power supply battery cell 12; the integrated busbar 20 is arranged on the plurality of battery cells 11, and the integrated busbar 20 includes a circuit board 21, and the circuit board 21 is integrated with a collection circuit and a conductive line 210; the collection circuit can collect the various The conductive circuit 210 includes a first terminal 211, a plurality of second terminals 212 and a wire 213, wherein the first terminal 211 is electrically connected to the positive electrode 113 of the power supply cell 12; the plurality of second terminals 212 are respectively connected to the top covers 111 of the plurality of battery cells 11 in a one-to-one correspondence; and the first terminal 211 and the plurality of second terminals 212 are electrically connected to the wire 213; wherein the power supply cell 12 is electrically connected to the top covers 111 corresponding to each battery cell 11 through the first terminal 211, the wire 213 and the plurality of second terminals 212, so that the power supply cell 12 provides a power supply potential for the top covers 111 and the aluminum shell 112 corresponding to each battery cell 11.

[0054] In the battery module 100 proposed by the utility model, the integrated busbar 20 is electrically connected to the power supply cell 12 and the top covers 111 of all the battery cells 11 of the battery module 100 through the first terminal 211, multiple second terminals 212 and the wire 213 of the conductive circuit 210, so that the power supply cell 12 can provide a potential for the top covers 111 and the aluminum shells 112 of all the battery cells 11 in the battery module 100, thereby ensuring the charging stability of the aluminum shells 112 of the battery cells 11, thereby effectively inhibiting the corrosion of the aluminum shells 112, and improving the service life and reliability of the power battery; at the same time, the power supply cell 12 and the top covers 111 of each battery cell 11 are electrically connected by the conductive circuit 210, and the conductive circuit 210 is integrated on the circuit board 21 of the integrated busbar 20, and is designed as an integrated whole with the integrated busbar 20, and does not increase the volume of the battery module 100, and can still maintain the lightweight of the battery module 100 and the battery pack.

[0055] Optionally, the battery cell 11 is in a rectangular parallelepiped shape, such as Figures 1 to 3 As shown in the figure, the battery cell 11 is illustrated as a square shell battery, the shell of the battery cell 11 includes two main surfaces, two side surfaces and an upper surface, and multiple battery cells 11 are stacked in sequence along their own thickness direction to form a battery unit 10, and the shell of the battery cell 11 is set to an aluminum shell 112.

[0056] The two adjacent cells 11 of the battery unit 10 fit closely together. The module housing 30 may be provided on the outside of the battery unit 10 or not, depending on the integration mode of the battery module 100. When the module housing 30 is used, the shape of the module housing 30 is determined by the stacking shape of the battery unit 10. The shape of the module housing 30 may be rectangular or square, etc. The size of the module housing 30 is set according to the number and specification of the cells 11, that is, the length, width and height of the module housing 30 should not be less than the stacking size of the battery unit 10 to ensure that the module housing 30 can accommodate all the cells 11 of the battery unit 10. Among them, the cells 11 of the battery unit 10 remain parallel to each other, and the two adjacent main surfaces of the two adjacent cells 11 remain closely fitted.

[0057] Each battery cell 11 of the battery unit 10 includes an aluminum shell 112 and a top cover 111 . The material of the top cover 111 can be set to aluminum, and the top cover 111 is arranged at the open end of the aluminum shell 112 .

[0058] Among the multiple battery cells 11 stacked in sequence in the battery unit 10 , at least one battery cell 11 is configured as a power supply battery cell 12 , and the power supply battery cell 12 is used to provide a potential for the aluminum shell 112 of each battery cell 11 in the battery module 100 .

[0059] In an exemplary embodiment, the structural diagram of the battery cell 11 is as follows: Figure 3 As shown, each battery cell 11 includes a top cover 111, a positive electrode column 113 and a negative electrode column 114, and the positive electrode column 113 and the negative electrode column 114 of each battery cell 11 are respectively covered with an insulating upper plastic 115, and the upper plastic 115 corresponding to the positive electrode column 113 and the negative electrode column 114 of each battery cell 11 is respectively connected to the corresponding top cover 111 of the battery cell 11.

[0060] Exemplarily, each battery cell 11 includes two upper plastics 115, which are respectively coated on the outside of the column of the positive electrode column 113 and the negative electrode column 114 of the battery cell 11. The upper plastics 115 are made of insulating material and are used to provide electrical isolation to prevent the positive electrode column 113 and the negative electrode column 114 of the battery cell 11 from directly contacting the metal parts outside the battery cell 11 (such as the battery cell 11 shell or other battery cells 11). A top cover 111 is correspondingly provided on the upper surface of each battery cell 11. The top cover 111 is made of aluminum. The corresponding positive electrode column 113 and negative electrode column 114 of the top cover 111 are respectively provided with a through hole. 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 on the periphery of the positive electrode column 113 and the negative electrode column 114 by injection molding, and is formed on the inner peripheral wall of the through hole.

[0061] In this embodiment, the positive pole 113 and the negative pole 114 of each battery cell 11 are respectively coated with an upper plastic 115, and the upper plastic 115 corresponding to the positive pole 113 and the negative pole 114 of each battery cell 11 are respectively connected to the top cover 111 corresponding to the battery cell 11, which can provide effective electrical insulation between the positive pole 113 and the negative pole 114 of the battery cell 11 and the metal parts outside the battery cell 11, thereby avoiding the risk of short circuit caused by direct contact between the positive pole 113 and the negative pole 114 inside the battery cell 11. At the same time, coating the positive pole 113 and the negative pole 114 of the battery cell 11 with the upper plastic 115 can also play a physical protection role, which can effectively prevent the positive pole 113 and the negative pole of the battery cell 11 from being damaged or displaced due to external impact or vibration during assembly, transportation or use, thereby avoiding mechanical damage to the internal structure of the battery cell 11.

[0062] In some embodiments, the battery cell 11 further includes a lower plastic 116, which is disposed below the top cover 111 and can further isolate the positive electrode column 113 and the negative electrode column 114 from contacting the top cover 111; on the other hand, the positive electrode column 113 and the negative electrode column 114 are electrically connected to the positive electrode ear 118 and the negative electrode ear 119 of the battery roll core 117 respectively through an adapter sheet (not shown), and the lower plastic 116 can isolate the positive electrode ear 118 and the negative electrode ear 119 of the battery roll core 117 from contacting the top cover 111, thereby further preventing the positive electrode column 113 and the negative electrode column 114 from being electrically connected to the top cover 111.

[0063] In the present invention, the integrated busbar 20 is used to connect multiple battery cells 11 in series or in parallel. Exemplarily, when the integrated busbar 20 connects multiple battery cells 11 in series, the integrated busbar 20 is used to connect the positive electrode of each battery cell 11 with the negative electrode of the next adjacent battery cell 11, thereby realizing electrical connection between the battery cells 11; when the integrated busbar 20 connects multiple battery cells 11 in parallel, the integrated busbar 20 is used to connect the positive electrode of each battery cell 11 and the negative electrode of each battery cell 11, thereby realizing electrical connection between the battery cells 11.

[0064] In some embodiments, the integrated busbar 20 includes a circuit board 21, a substrate 22 and a plurality of conductive members 23. The circuit board 21 is electrically connected to the positive electrode of the power supply cell 12 and the top cover 111 corresponding to each battery cell 11. The circuit board 21 is used to transfer the power of the power supply cell 12 to the top cover 111 of each battery cell 11 in the battery unit 10, so that the aluminum shell 112 and the top cover 111 of each battery cell 11 in the battery unit 10 are charged, thereby effectively preventing corrosion of the aluminum shell 112.

[0065] In some embodiments, 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., which is not limited in the present application.

[0066] In this embodiment, the integrated busbar 20 includes a circuit board 21, which can be electrically connected to the power supply cell 12 and the top cover 111 of each cell 11, so that the power supply cell 12 can provide a potential for the top cover 111 and the aluminum shell 112 corresponding to each cell 11, so that the aluminum shell 112 corresponding to each cell 11 has a higher potential, which prevents lithium ions from being deposited on the aluminum shell 112, inhibits the occurrence of local electrochemical reactions, and avoids corrosion of the aluminum shell 112. At the same time, the circuit board 21 of the integrated busbar 20 provides a potential for the top cover 111 and the aluminum shell 112 of each cell 11, which is different from the traditional method of connecting through plastic parts, so that the aluminum shell 112 of the cell 11 can stably maintain the required potential, ensuring the stability of the charge of the aluminum shell 112 of the cell 11. Even if the insulating layer inside the aluminum shell 112 is damaged, the high potential of the aluminum shell 112 limits the deposition of lithium ions thereon, and the aluminum shell 112 will not corrode.

[0067] In the present invention, the integrated busbar 20 is used to connect multiple battery cells 11 in series or in parallel. Figure 4 , which is a schematic structural diagram of an integrated busbar 20 , wherein the integrated busbar 20 includes a substrate 22 , a circuit board 21 and a plurality of conductive members 23 .

[0068] Exemplarily, the circuit board 21 and multiple conductive members 23 are arranged on a substrate 22, and the substrate 22 is used to provide electrical and physical support for the circuit board 21 and the conductive members 23, so that the circuit board 21 and the conductive members 23 remain fixed and stable in the battery module 100 to avoid displacement or vibration during use.

[0069] In some embodiments, the number of conductive members 23 depends on the number of poles of the battery cell 11, and multiple conductive members 23 are respectively arranged corresponding to the poles of each battery cell 11, and each conductive member 23 is used to conductively connect the positive pole 113 and the negative pole 114 of two adjacent battery cells 11, or each conductive member 23 is used to conductively connect the two positive poles 113 or the two negative poles 114 of two adjacent battery cells 11, thereby realizing the series connection or parallel connection of two adjacent battery cells 11.

[0070] In some specific embodiments, the conductive member 23 is an aluminum conductive member, a copper conductive member, an aluminum conductive member with a nickel or copper plated surface, an aluminum-copper alloy conductive member, etc.; the specific shape of the conductive member 23 can be designed based on a variety of factors such as the overall structure of the integrated busbar, the structure of the substrate 22, the shape design of the circuit board 21, and the weight limit of the integrated busbar, and is not limited here.

[0071] In some embodiments, each conductive member 23 is respectively located on both sides of the circuit board 21, and the conductive members 23 on both sides of the circuit board 21 are respectively electrically connected to the positive electrode column 113 and the negative electrode column 114 of the battery cell 11 by welding or the like, so as to realize series or parallel connection of multiple battery cells 11 of the battery unit 10, thereby ensuring the flow of current in the battery unit 10 and the transmission of electric energy between the battery cells 11.

[0072] Optionally, the substrate 22 is a plastic substrate or other functional substrate; specifically, the substrate 22 may have a heat dissipation function, which may be used to reduce the operating temperature of the battery module 100 by adding a conductive material to the resin substrate of the substrate 22 or attaching a heat sink to the side of the resin substrate close to the conductive member 23 and / or the circuit board 21, thereby improving the stability of the battery module 100; or, the substrate 22 may have a low temperature resistance function, and a low temperature resistant fiber material may be added to the resin substrate of the substrate 22 to increase the low temperature toughness of the substrate 22, thereby increasing the operating temperature range of the battery module 100. The material and shape of the substrate 22 may be selected according to actual product requirements, and this application does not impose any restrictions.

[0073] In some embodiments of the present application, the integrated busbar 20 includes a circuit board 21, a substrate 22 and a conductive member 23. The substrate 22 is used to provide electrical and physical support for the circuit board 21 and the conductive member 23, so that the circuit board 21 and the conductive member 23 remain fixed and stable in the battery module 100 to avoid displacement or vibration during use. The conductive member 23 can realize series or parallel connection of multiple battery cells 11 of the battery unit 10. At the same time, the circuit board 21 can provide a potential for the aluminum shell 112 and the top cover 111 corresponding to each battery cell 11, so that the aluminum shell 112 corresponding to each battery cell 11 is charged.

[0074] See also Figure 5 , Figure 6 and Figure 7 , Figure 5 is a schematic diagram of the structure of the circuit board 21, Figure 6 is a schematic diagram of the structure of the integrated busbar 20 close to the battery unit 10. Figure 7 for Figure 5 Magnified view of area A.

[0075] In some embodiments, the circuit board 21 is integrated with a collection circuit (not shown) and a conductive circuit 210 , and the collection circuit is conductively connected to each conductive member 23 to collect the electrical signal of each battery cell 11 .

[0076] In some specific embodiments, a connection terminal 214 is provided on the circuit board 21 , and the acquisition circuit on the circuit board 21 is connected to each conductive member 23 through the connection terminal 214 , and then obtains the electrical signal of each battery cell 11 through each conductive member 23 .

[0077] Optionally, the acquisition circuit is used to collect the electrical signal of each battery cell 11 and transmit the electrical signal of the battery cell 11 to a battery management system (BMS) or other monitoring equipment, so that the battery management system can monitor and process the battery module 100 .

[0078] Furthermore, the electrical signals collected by the acquisition circuit may be signal data such as voltage, current or temperature. Specifically, they may include the output voltage or output current of each battery cell 11, the charging voltage or charging current, the voltage of the aluminum shell 112, the temperature (or temperature distribution) of the winding core or the laminated body inside the aluminum shell 112, and the temperature (or temperature distribution) outside the aluminum shell 112.

[0079] In this embodiment, the acquisition circuit is used to collect the electrical signal of each battery cell 11 and transmit it to a battery management system (BMS) or other monitoring equipment, which can ensure the efficient and safe operation of the battery module 100 and thus extend the service life of the battery module 100.

[0080] In some specific embodiments, a negative temperature coefficient (NTC) chip, a thermistor or a temperature sensor wire may be integrated on the circuit board 21 to monitor the temperature of each battery cell 11 and adjust the temperature of each battery cell 11 in time, thereby effectively regulating the overall temperature of the battery module 100 and ensuring the safety of the battery module 100.

[0081] In some embodiments, the conductive circuit 210 includes: a first terminal 211, which is electrically connected to the power supply cell 12; a plurality of second terminals 212, which are respectively electrically connected to the top covers 111 corresponding to the plurality of battery cells 11; and a wire 213, to which the first terminal 211 and the plurality of second terminals 212 are electrically connected; wherein the power supply cell 12 is electrically connected to the top covers 111 corresponding to each battery cell 11 through the wire 213, the first terminal 211 and the plurality of second terminals 212, so that the power supply cell 12 provides a potential for the top covers 111 corresponding to each battery cell 11, and charges the aluminum shell 112 corresponding to each battery cell 11.

[0082] In some embodiments, the electrical signal of each battery cell 11 obtained by the acquisition circuit includes a voltage signal of the aluminum shell 112 of each battery cell 11 , and the voltage of the aluminum shell 112 of each battery cell 11 is 1.5V~4.5V.

[0083] Exemplarily, the voltage of the aluminum shell 112 can be 1.5V, 2V, 2.5V, 3V, 3.5V, 4V, 4.5V, etc., but is not limited to this. The voltage of the aluminum shell 112 can be greater than 4.5V, but from the perspective of saving power consumption, for the graphite negative electrode, the voltage of the aluminum shell 112 should not be too high, and should be no greater than 5V.

[0084] In some preferred embodiments, the lowest voltage of the aluminum shell 112 may also be less than 1.5 V. Specifically, in a lithium negative electrode battery, the voltage of the aluminum shell 112 may be less than 1.5 V, but preferably greater than 1.3 V; in some other embodiments, such as in a graphite negative electrode battery, the voltage of the aluminum shell 112 is preferably greater than or equal to 2 V to prevent lithium ions from being deposited on the aluminum shell 112.

[0085] In some embodiments, the first terminal 211 is fixedly connected to the positive electrode column 113 of the power supply cell 12 .

[0086] Optionally, the first terminal 211 and the positive electrode column 113 of the power supply cell 12 may be electrically connected by welding, crimping, plugging, or the like.

[0087] The first terminal 211 is fixedly connected to the positive pole 113 of the power supply cell 12, and is used to conduct the positive potential of the power supply cell 12 to other circuit parts in the integrated busbar 20, such as the wire 213 and the second terminal 212. The first terminal 211 and the plurality of second terminals 212 are electrically connected to the wire 213, and are used to transfer the positive potential of the power supply cell 12 from the first terminal 211 to the plurality of second terminals 212.

[0088] In some exemplary embodiments, the wire 213 is arranged on the circuit board 21 and is set corresponding to the stacking arrangement direction of the battery unit 10; a plurality of second terminals 212 are arranged on the wire 213 at intervals along the extension direction of the wire 213; wherein the plurality of second terminals 212 are in contact and connected with the top covers 111 of the plurality of battery cells 11.

[0089] In some embodiments, the plurality of second terminals 212 are in contact with and connected to the top covers 111 of the plurality of battery cells 11. In some specific embodiments, the second terminal 212 is disposed corresponding to the aluminum exposed area of ​​the top cover 111 of the corresponding battery cell 11, so that the second terminal 212 can directly contact the aluminum exposed area, thereby achieving electrical connection between the second terminal 212 and the top cover 111.

[0090] Furthermore, the above-mentioned aluminum exposed area can be the laser area of ​​the battery QR code on the top cover 111. However, it is not limited to this, and the area other than the pole area and the explosion-proof valve area on the top cover 111 that can be electrically connected to the second terminal 212 can achieve the purpose of the utility model.

[0091] The second terminals 212 are electrically connected to the top covers 111 corresponding to the battery cells 11 , respectively, and the second terminals 212 are electrically connected to the wires 213 , ensuring that the top cover 111 of each battery cell 11 can be in electrical contact with the conductive circuit 210 .

[0092] In the embodiment of the present invention, the conductive circuit 210 is integrated on the circuit board 21 , that is, the first terminal 211 , the plurality of second terminals 212 , and the conductive wires 213 are all integrated on the circuit board 21 .

[0093] Further, in some specific embodiments, the conductor 213 can be an aluminum wire, a copper wire, an aluminum-copper alloy wire, or an aluminum foil strip, a copper foil strip, etc.; illustratively, the circuit board 21 can be a flexible circuit board, and the conductor 213 is formed in the substrate of the flexible circuit board.

[0094] Further, in the present invention, the first terminal 211 and the second terminal 212 are conductively connected to the wire 213 in the circuit board 21, and the specific structures of the first terminal 211 and the second terminal 212 are not limited. For example, the first terminal 211 and the second terminal 212 can be tin points formed on the circuit board 21, or conductive terminals formed on the circuit board 21 by patching, or conductive blocks welded on the circuit board 21, etc.

[0095] In the utility model, the conductive circuit 210 is integrated on the circuit board 21, that is, the first terminal 211, multiple second terminals 212 and the wire 213 are all integrated on the circuit board 21. The integrated structure of the circuit board 21 ensures that the battery module 100 will not increase in components, thereby not causing an increase in volume and weight, thereby ensuring the lightweight of the battery module 100; at the same time, the second terminal 212 is in contact and connected with the non-pole area of ​​the top cover 111, and the integrated busbar 20 is assembled on the battery unit 10 to complete the electrical connection between the second terminal 212 and the top cover 111 of the battery cell 11, respectively, without the need for additional welding or fixing processes, and the production process is simple.

[0096] In the embodiment of the utility model, the first terminal 211 is electrically connected to the power supply cell 12, and the plurality of second terminals 212 are respectively electrically connected to the top covers 111 corresponding to the plurality of cells 11, and the first terminal 211 and the plurality of second terminals 212 are electrically connected to the wire 213, so that the power supply cell 12 can provide a potential for the top covers 111 of all cells 11 in the battery unit 10, thereby causing the aluminum shell 112 of each cell 11 to be charged with a potential. The charging effect of the aluminum shell 112 can effectively prevent the electrolyte inside the battery from directly contacting the aluminum shell 112, thereby avoiding corrosion of the aluminum shell 112 caused by the reaction of lithium ions with aluminum to form an aluminum-lithium alloy.

[0097] In an exemplary embodiment, see Figure 8 and Fig. 9 , Figure 8 for Figure 5 The enlarged image of area B in the middle. Fig. 9 Schematic diagram of the connection between the second terminal 212 and the top cover 111. The second terminal 212 includes an elastic contact 2120, which is used to abut the top cover 111 of the battery cell 11; wherein the side of the elastic contact 2120 close to the top cover 111 is set as a frosted surface or a serrated surface.

[0098] The elastic contact 2120 includes an elastic member 2121, an abutment joint 2122 and a contact surface 2123. The elastic member 2121 is made of a metal material with good elasticity, and the elastic member 2121 is used to provide sufficient elastic force to ensure stable contact between the second terminal 212 and the top cover 111 of the battery cell 11. The abutment joint 2122 is fixed to a side of the elastic member 2121 close to the top cover 111 of the battery cell 11, and the abutment joint 2122 can be fixedly connected to the elastic member 2121 by welding, an integrated connection, etc. The contact surface 2123 is located on a side of the abutment joint 2122 close to the top cover 111 of the battery cell 11, and the contact surface 2123 is used to directly contact the top cover 111 of the battery cell 11.

[0099] Optionally, the contact surface 2123 is set to a frosted surface or a serrated surface, which can enhance the contact friction between the contact surface 2123 and the top cover 111 of the battery cell 11, ensure the stability of the connection between the elastic contact 2120 and the top cover 111, and avoid poor contact between the elastic contact 2120 and the top cover 111 due to vibration or external force.

[0100] Optionally, the elastic member 2121 may be a spring or a spring sheet, such as Figure 8 As shown, Figure 8The elastic member 2121 is illustrated as a spring, but the present invention is not limited thereto. After the integrated busbar 20 is fixedly connected to the battery unit 10, that is, the conductive member 23 is fixedly connected to the pole of each battery cell 11, and the connection terminal 214 of the circuit board 21 is connected to the conductive member, the elastic member 2121 is compressed under the joint action of the substrate 22 and the conductive member 23, so that the elastic contact 2120 can abut against the top cover 111 with a larger abutting force, thereby improving the contact stability between the elastic contact 2120 and the top cover 111.

[0101] In this embodiment, the second terminal 212 includes an elastic contact 2120, which is used to abut the top cover 111 of the battery cell 11; wherein, the side of the elastic contact 2120 close to the top cover 111 is set to a frosted surface or a serrated surface, which can ensure the stability of the connection between the elastic contact 2120 and the top cover 111 of the battery cell 11, avoid poor contact between the elastic contact 2120 and the top cover 111 due to vibration or external force, and thereby ensure the stability of the electrical connection between the top cover 111 of each battery cell 11 and the conductive circuit 210.

[0102] In an exemplary embodiment, the battery module 100 includes two power supply cells 12 and two first terminals 211; wherein, the positive electrode columns 113 corresponding to the two power supply cells 12 are arranged at intervals on the wire 213, and the two first terminals 211 are correspondingly connected to the positive electrode columns 113 corresponding to the two power supply cells 12.

[0103] In other embodiments, the number of power cells 12 may be 3 or more, but when the voltage provided by the power cells 12 to the aluminum shell 112 of each battery cell 11 is not adjustable, the number of power cells 12 is preferably 1-2 to prevent affecting the overall electrical performance of the battery module 100.

[0104] Optionally, the battery module 100 includes two power supply cells 12 and two first terminals 211. The positive poles 113 of the two power supply cells 12 are arranged at intervals along the length direction of the battery module 100. Correspondingly, the two first terminals 211 are also arranged at intervals along the length direction of the battery module 100, and the two first terminals 211 are respectively connected to the positive poles 113 corresponding to the two power supply cells 12. The two first terminals 211 are electrically connected to the wire 213. When the two first terminals 211 are respectively connected to the positive poles 113 corresponding to the two power supply cells 12, each first terminal 211 can transmit the potential of the positive pole 113 of the power supply cell 12 to the wire 213, and transmit the potential to the second terminal 212 through the wire 213, and then transmit it to the aluminum shell 112 and the top cover 111 of the battery cell 11 through the second terminal 212, so that the aluminum shell 112 of each battery cell 11 is charged, thereby avoiding the corrosion problem caused by the contact between lithium ions and the aluminum shell 112. At the same time, the two sets of first terminals 211 are connected to the positive poles 113 of the two power supply cells 12, ensuring that the positive electrode potential of the cell 11 can be transmitted to the top cover 111 and the aluminum shell 112 of the multiple cells 11 in the entire battery module 100 through these terminals, thereby improving the reliability of inhibiting corrosion of the aluminum shell 112.

[0105] In this embodiment, the battery module 100 includes two power supply cells 12 and two first terminals 211, ensuring that the positive electrode potential of the cell 11 can be transmitted to the top cover 111 and the aluminum shell 112 of the multiple cells 11 in the entire battery module 100 through these terminals, thereby improving the reliability of inhibiting the corrosion of the aluminum shell 112. When the number of power supply cells 12 is two or more, the voltage output of a single power supply cell 12 can be reduced to minimize the performance impact of the power supply cell 12 itself caused by supplying power to the aluminum shell 112, thereby ensuring the stability of the power supply cell 12, and taking into account both the corrosion problem of the aluminum shell 112 and the performance stability problem of the battery module 100.

[0106] In an exemplary embodiment, Fig.10 As shown, it is a circuit connection diagram of the battery management system 13 and the battery cell 11. The acquisition circuit 215 is connected to the battery management system 13 of the battery unit 10. The battery management system 13 can adjust the output voltage of the power supply battery cell according to the electrical signal of each battery cell 11 collected by the acquisition circuit 215.

[0107] In some specific embodiments, the acquisition circuit 215 is connected to the battery management system 13 of the battery unit 10. The battery management system 13 can obtain the voltage on the aluminum shell 112 of each battery cell 11 through the acquisition circuit 215, thereby monitoring the voltage change on the aluminum shell 112 of each battery cell 11. When the voltage of one or some aluminum shells 112 is less than a preset minimum threshold or greater than a preset maximum threshold, the battery management system 13 controls the output voltage of the power supply battery cell 12 to increase or decrease, so that the voltage of the aluminum shell 112 or those aluminum shells 112 returns to a preset voltage range, for example, between 1.5V-4.5V, thereby ensuring that each aluminum shell 112 is not corroded and the overall electrical performance of the battery module 100 is stable.

[0108] Of course, in some embodiments, when there are multiple power cells 12, the battery management system 13 can also adjust the voltage output of the power cells 12 in real time according to the voltage or temperature changes of each power cell 12, while ensuring that the voltage of the aluminum shell 112 of each cell 11 is within a preset voltage range, and ensuring that the electrochemical performance of the power cell 12 itself is stable.

[0109] In an exemplary embodiment, Fig.11 As shown, it is a circuit connection diagram of the variable resistor 216, the variable resistor 216 is connected to the wire 213, and the acquisition circuit 215 and the variable resistor 216 are both connected to the battery management system 13; wherein, the battery management system 13 can adjust the resistance value of the variable resistor 216 according to the electrical signal of each battery cell 11 collected by the acquisition circuit 215.

[0110] Exemplarily, the battery unit 10 of the battery module 100 includes a plurality of battery cells 11, each of which includes an aluminum shell 112, a top cover 111, a positive pole 113, and a negative pole 114. The battery module 100 also includes an integrated busbar 20, whose main function is to obtain the electrical signal of each battery cell 11 through the circuit board 21, and at the same time provide a potential to the top cover 111 and the aluminum shell 112 corresponding to each battery cell 11 through the circuit board 21, so that the aluminum shell 112 corresponding to each battery cell 11 is charged. The integrated busbar 20 includes a circuit board 21, and the circuit board 21 includes a collection circuit 215 and a conductive circuit 210, and a variable resistor 216 is connected to the wire 213 of the conductive circuit 210. The collection circuit 215 and the variable resistor 216 are both connected to the battery management system 13. The acquisition circuit 215 and the variable resistor 216 are both connected to the battery management system 13. The battery management system 13 monitors the working state of each battery cell 11 in the battery unit 10 of the battery module 100 and the voltage of the aluminum shell 112 of each battery cell 11 in real time by receiving the electrical signal transmitted by the acquisition circuit 215. The battery management system 13 obtains the voltage on the aluminum shell 112 of each battery cell 11 through the acquisition circuit 215. When the voltage on each aluminum shell 112 is too high or too low, the battery management system 13 adjusts the resistance value of the variable resistor 216, thereby adjusting the voltage on the conductive circuit, so that the voltage of each aluminum shell 112 returns to the preset voltage range.

[0111] In this embodiment, a variable resistor 216 is connected to the wire 213, and the acquisition circuit 215 and the variable resistor 216 are both connected to the battery management system 13. By adjusting the resistance value of the variable resistor 216, the battery management system 13 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 a correct potential, thereby preventing the aluminum shell 112 from being corroded due to electrochemical reactions (such as lithium ion insertion reactions), thereby effectively improving the service life and safety of the battery.

[0112] In an exemplary embodiment, the positive electrodes and negative electrodes of the multiple battery cells 11 of the battery unit 10 are arranged alternately along the length direction of the battery unit 10, and the multiple battery cells 11 are connected in series through the integrated busbar 20. The multiple conductive members 23 of the integrated busbar 20 are respectively arranged corresponding to the poles of each battery cell 11, and the positive poles 113 and the negative poles 114 of two adjacent battery cells 11 are connected through each conductive member 23, so that the series connection of two adjacent battery cells 11 can be achieved.

[0113] In an exemplary embodiment, the positive electrodes and negative electrodes of the multiple cells 11 of the battery unit 10 are arranged in the same direction along the length direction of the battery unit 10, and the multiple cells 11 are connected in parallel through the integrated busbar 20. The positive electrode posts 113 of two adjacent cells 11 are connected to the positive electrode posts 113, and the negative electrode posts 114 are connected to the negative electrode posts 114 through the conductive members 23, so as to realize the parallel connection of two adjacent cells 11.

[0114] In this embodiment, the arrangement of the conductive member 23 enables the battery unit 10 to operate efficiently and stably.

[0115] In a second aspect, the present application provides a battery pack, comprising any one of the battery modules 100 provided in the first aspect, and the battery pack also includes a battery management system.

[0116] Exemplarily, the battery pack includes a plurality of any battery modules 100 provided in the first aspect, each battery pack includes a battery cell 10 and an integrated busbar 20. The battery pack also includes a battery management system, and the acquisition circuit 215 and the variable resistor 216 of each battery module 100 are connected to the battery management system. The battery management system 13 is used to monitor and manage the charging and discharging process of the battery to ensure that the battery module 100 operates under safe and stable conditions.

[0117] In one embodiment of the present invention, a battery module 100 is provided. The battery module 100 includes a battery cell 10 and an integrated busbar 20:

[0118] The battery unit 10 includes a plurality of battery cells 11, and the plurality of battery cells 11 are stacked and arranged along the thickness direction of the battery cells 11; each battery cell 11 includes an aluminum shell 112 and a top cover 111, and the top cover 111 is arranged at the open end of the aluminum shell 112; wherein at least one of the plurality of battery cells 11 is a power supply battery cell 12; the electrical signal of each battery cell 11 includes a voltage signal of the aluminum shell 112 of each battery cell 11, and the voltage of the aluminum shell 112 of each battery cell 11 is 1.5V~4.5V.

[0119] The integrated busbar 20 is arranged on a plurality of battery cells 11, and the integrated busbar 20 includes a circuit board 21, on which a collection circuit 215 and a conductive circuit 210 are integrated. The collection circuit 215 is used to collect electrical signals from each battery cell 11; the collection circuit 215 is connected to the battery management system 13 of the battery unit 10, and the battery management system 13 adjusts the output voltage of the power supply battery cell 12 according to the electrical signals of each battery cell 11 collected by the collection circuit 215. The conductive circuit 210 includes: a first terminal 211, which is electrically connected to the positive pole 113 of the power supply battery cell 12; a plurality of second terminals 212, which are respectively connected to the top covers 111 of the plurality of battery cells 11 in a one-to-one correspondence; and a wire 213, to which the first terminal 211 and the plurality of second terminals 212 are both electrically connected.

[0120] The power supply cell 12 is electrically connected to the top cover 111 corresponding to each cell 11 through the first terminal 211 , the wire 213 and a plurality of second terminals 212 , so that the power supply cell 12 provides a power supply potential for the top cover 111 and the aluminum shell 112 corresponding to each cell 11 .

[0121] The wire 213 is arranged on the circuit board 21 and is set corresponding to the stacking arrangement direction of the battery unit 10; multiple second terminals 212 are arranged on the wire 213 at intervals along the extension direction of the wire 213; wherein the multiple second terminals 212 can respectively contact and connect with the top covers 111 of multiple battery cells 11.

[0122] The second terminal 212 includes an elastic contact 2120 , and the elastic contact 2120 is used to abut against the top cover 111 of the battery cell 11 ; wherein a side of the elastic contact 2120 close to the top cover 111 is configured as a frosted surface or a serrated surface.

[0123] The first terminal 211 is disposed corresponding to the positive electrode post 113 of the power supply cell 12 , and the first terminal 211 is fixedly connected to the positive electrode post 113 of the power supply cell 12 .

[0124] A variable resistor 216 is connected to the wire 213 , and both the acquisition circuit 215 and the variable resistor 216 are connected to the battery management system 13 of the battery unit 10 ; wherein the battery management system 13 adjusts the resistance value of the variable resistor 216 according to the electrical signal of each battery cell 11 collected by the acquisition circuit 215 .

[0125] The positive pole 113 and the negative pole 114 of each battery cell 11 are respectively covered with an insulating plastic 115 , and the insulating plastic 115 corresponding to the positive pole 113 and the negative pole 114 of each battery cell 11 is respectively connected to the corresponding top cover 111 of the battery cell 11 .

[0126] The battery module 100 includes two power supply cells 12 and two first terminals 211 ; wherein the two first terminals 211 are spaced apart on the wire 213 corresponding to the positive poles 113 of the two power supply cells 12 , and the two first terminals 211 are correspondingly connected to the positive poles 113 of the two power supply cells 12 .

[0127] In one embodiment of the present invention, a battery pack is provided, comprising any one of the above-mentioned battery modules 100 , and the battery pack further comprises a battery management system 13 .

[0128] In the present embodiment, the positive electrode column 113 and the negative electrode column 114 of each battery cell 11 are respectively coated with an upper plastic 115, and the upper plastic 115 corresponding to the positive electrode column 113 and the negative electrode column 114 of each battery cell 11 are respectively connected to the top cover 111 corresponding to the battery cell 11, which can provide effective electrical insulation between the positive electrode column 113 and the negative electrode column 114 of the battery cell 11 and the metal parts outside the battery cell 11, thereby avoiding the risk of short circuit caused by direct contact between the positive electrode column 113 and the negative electrode column 114 inside the battery cell 11. The integrated busbar 20 includes a circuit board 21, a substrate 22 and a conductive member 23. The substrate 22 is used to provide electrical and physical support for the circuit board 21 and the conductive member 23, so that the circuit board 21 and the conductive member 23 remain fixed and stable in the battery module 100 to avoid displacement or vibration during use. The conductive member 23 can realize the series or parallel connection of multiple cells 11 of the battery unit 10. At the same time, the circuit board 21 can provide a potential for the aluminum shell 112 and the top cover 111 corresponding to each cell 11, so that the aluminum shell 112 corresponding to each cell 11 is charged. The first terminal 211 is electrically connected to the power supply cell 12, and the plurality of second terminals 212 are respectively electrically connected to the top covers 111 corresponding to the plurality of cells 11, and the first terminal 211 and the plurality of second terminals 212 are electrically connected to the wire 213, so that the power supply cell 12 can provide a potential for the top covers 111 of all cells 11 in the battery unit 10, thereby causing the aluminum shell 112 of each cell 11 to be charged. The charging effect of the aluminum shell 112 can effectively prevent the electrolyte inside the battery from directly contacting the aluminum shell 112, thereby avoiding corrosion of the aluminum shell 112 caused by the reaction of lithium ions and aluminum to form an aluminum-lithium alloy.

[0129] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0130] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A battery module, characterized in that: The battery module comprises: A battery unit, comprising a plurality of battery cells, wherein the plurality of battery cells are stacked and arranged along the thickness direction of the battery cells; each of the battery cells comprises an aluminum shell and a top cover, wherein the top cover is arranged at an open end of the aluminum shell; wherein at least one of the plurality of battery cells is a power supply battery cell; and An integrated busbar is arranged on the plurality of battery cells, the integrated busbar comprises a circuit board, and a collection circuit and a conductive circuit are integrated on the circuit board; the collection circuit can collect the electrical signal of each battery cell, and the conductive circuit comprises: A first terminal electrically connected to the positive electrode of the power supply cell; A plurality of second terminals are connected to the top covers of the plurality of battery cells in a one-to-one correspondence; and A wire, the first terminal and the plurality of the second terminals are all electrically connected to the wire; The power supply cell is electrically connected to the top cover corresponding to each of the cells through the first terminal, the wire and a plurality of the second terminals, so that the power supply cell provides a power supply potential for the top cover and the aluminum shell corresponding to each of the cells.

2. The battery module according to claim 1, characterized in that: The electrical signal of each battery cell includes a voltage signal of an aluminum shell of each battery cell, and the voltage of the aluminum shell of each battery cell is 1.5V~4.5V.

3. The battery module according to claim 1, characterized in that: The conductive wires are arranged on the circuit board and are arranged corresponding to the stacking arrangement direction of the battery cells; A plurality of the second terminals are arranged on the wire at intervals along the extension direction of the wire; Wherein, the plurality of second terminals can be respectively contacted and connected with the top covers of the plurality of battery cells.

4. The battery module according to claim 1, characterized in that: The second terminal includes an elastic contact, and the elastic contact is used to abut against the top cover of the battery cell; Wherein, a side of the elastic contact close to the top cover is set as a frosted surface or a serrated surface.

5. The battery module according to claim 1, characterized in that: The first terminal is arranged corresponding to the positive electrode column of the power supply cell, and the first terminal is fixedly connected to the positive electrode column of the power supply cell.

6. The battery module according to claim 1, characterized in that: The battery module includes two power supply cells and two first terminals; Among them, the two first terminals corresponding to the positive poles of the two power supply cells are arranged on the wire at intervals, and the two first terminals are correspondingly connected to the positive poles corresponding to the two power supply cells.

7. The battery module according to claim 1, characterized in that: The acquisition circuit is connected to a battery management system of the battery unit, and the battery management system can adjust the output voltage of the power supply cell according to the electrical signal of each cell acquired by the acquisition circuit.

8. The battery module according to claim 1, characterized in that: A variable resistor is connected to the wire, and both the acquisition circuit and the variable resistor are connected to the battery management system of the battery unit; wherein the battery management system can adjust the resistance value of the variable resistor according to the electrical signal of each battery cell acquired by the acquisition circuit.

9. The battery module according to claim 1, characterized in that: The positive pole and the negative pole of each battery cell are respectively covered with insulating upper plastic, and the insulating upper plastic corresponding to the positive pole and the negative pole of each battery cell is respectively connected to the corresponding top cover of the battery cell.

10. A battery pack, characterized in that: The battery pack comprises the battery module according to any one of claims 1 to 9, wherein the battery pack further comprises a battery management system.

Images