Battery pack and energy storage power supply

Abstract

The utility model discloses a battery pack and an energy storage power supply, the battery pack comprises a plurality of battery cells and a support assembly, the support assembly comprises a support and an electric connecting piece which are integrally injection-molded, the electric connecting piece is embedded in the support, the support is provided with an opening, and the support assembly is configured to fix the plurality of battery cells through the support. And the electrodes of the plurality of battery cells are electrically connected with the electric connecting piece through the openings. According to the battery pack provided by the invention, the electric connecting piece is directly and integrally injected into the bracket, so that the electric connecting piece is fixed in advance, the problem of thermal runaway of the battery caused by short circuit due to movement of the electric connecting piece when the electric connecting piece is welded with the electrode of the battery cell is avoided, and the potential safety hazard is favorably reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage devices, and more particularly to a battery pack and an energy storage power supply. BACKGROUND

[0002] The battery pack includes a plurality of battery cells, a support, and busbars. The plurality of battery cells are fixed by the support, and the busbars are arranged on the support and welded with the electrodes of the battery cells. However, during installation of the busbars, due to the large number of busbars, the busbars may be misconnected or short-circuited, which may cause thermal runaway of the battery pack and pose a safety hazard. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a battery pack and an energy storage power supply to solve at least one of the above technical problems.

[0004] The battery pack of the present application includes:

[0005] a plurality of battery cells;

[0006] a support assembly including a support and an electrical connector integrally injection molded, the electrical connector being embedded in the support, the support being formed with an opening, the support assembly being configured to fix the plurality of battery cells by the support, so that the electrodes of the plurality of battery cells are electrically connected with the electrical connector through the opening.

[0007] The battery pack provided by the present application directly integrally injection molds the electrical connector into the support, thereby pre-completing the fixation of the electrical connector, avoiding the movement of the electrical connector during welding of the electrical connector with the electrodes of the battery cells, thereby causing short circuit and battery thermal runaway, and being conducive to reducing safety hazards.

[0008] In some embodiments, the electrical connector is embedded on the support by a sleeve process.

[0009] In this way, the support assembly is processed by the sleeve process, which is conducive to improving production efficiency.

[0010] In some embodiments, the support includes a first surface and a second surface opposite to the first surface, the opening is arranged on the second surface, the support is provided with a first fixing hole on the first surface, the first fixing hole is in communication with the opening, the electrical connector is embedded in the support close to the second surface, and the battery cell is fixed in the first fixing hole, so that the electrode is electrically connected with the electrical connector.

[0011] In this way, the electrical connector is arranged close to the second surface, so that there is a gap between the electrical connector and the battery cell, and the support also forms a partition between the electrical connector and the battery cell, thereby avoiding short circuit of the battery cell caused by accidental contact between the electrical connector and the battery cell.

[0012] In some embodiments, the electric core is a cylindrical electric core, the first fixing hole is a circular hole matched with the electric core, the opening is a circular hole formed by the first fixing hole through the second surface, the support further comprises a fixing part, the fixing part extends from the inner wall of the first fixing hole close to the second surface to the first fixing hole in the extension direction of the electric connector, and the electric connector comprises a first connecting end extending from the fixing part, and the first connecting end is configured to be connected with the electrode.

[0013] In this way, the fixing part can block the electric core to prevent the electric core from escaping from the opening, and the stability of the electric connector can be improved.

[0014] In some embodiments, the electric connector further comprises a second connecting end away from the first connecting end, the second connecting end extends into the corresponding opening, the second connecting end comprises a bending part bent towards the first surface and a welding part connected substantially perpendicularly to the bending part, and the welding part is configured to be electrically connected with the electrode.

[0015] In this way, the second connecting end is arranged close to the electrode, and the electrical connection between the second connecting end and the electrode is facilitated.

[0016] In some embodiments, the bending part is arranged along the edge of the opening.

[0017] In this way, the bending part abuts against the edge of the window, and the electric connector can be fixed more firmly.

[0018] In some embodiments, the material of the first connecting end is nickel, and the material of the second connecting end is copper.

[0019] In this way, different materials are used to electrically connect with different electrodes, and the service life of the first connecting end and the second connecting end can be improved.

[0020] In some embodiments, the electric connector comprises a main body, the first connecting end and the second connecting end are connected with the main body, the main body is embedded on the support through a sleeve process, the material of the main body is soft copper, and the materials of the first connecting end and the second connecting end are hard copper.

[0021] In this way, the main body is made of soft copper with smaller hardness, and the welding error can be eliminated.

[0022] In some embodiments, the electric connector comprises a main body and a third connecting end bent and extended away from the support, the main body is embedded on the support through a sleeve process, the third connecting end is connected with the main body, and the third connecting end is electrically connected with a battery management module.

[0023] Thus, the third connecting end is extended away from the support frame to form an operation space, facilitating connection with the battery management module.

[0024] In some embodiments, the main body is made of aluminum, and the third connecting end is made of copper-nickel plating.

[0025] Thus, the connecting end of the battery management module is made of copper-nickel plating, and the third connecting end is also made of copper-nickel plating, which can ensure the service life of the product, and the third connecting end or the fourth connecting end made of aluminum can reduce the production cost.

[0026] The energy storage power supply of another embodiment of the present application comprises the battery pack of any one of the above.

[0027] Additional aspects and advantages of the embodiments of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0029] Figure 1 is a structural schematic diagram of an energy storage power supply of an embodiment of the present application;

[0030] Figure 2 is a structural schematic diagram of a support assembly of an energy storage power supply of an embodiment of the present application;

[0031] Figure 3 is a structural schematic diagram of a housing of an energy storage power supply of an embodiment of the present application;

[0032] Figure 4 is a structural schematic diagram of an electric core of an energy storage power supply of an embodiment of the present application;

[0033] Figure 5 is a top view of an energy storage power supply of an embodiment of the present application;

[0034] Figure 6 is a sectional view of an energy storage power supply of an embodiment of the present application;

[0035] Figure 7 is a structural schematic diagram of an electric connecting piece of an energy storage power supply of an embodiment of the present application;

[0036] Figure 8 is a structural schematic diagram of an electric connecting piece of an energy storage power supply of an embodiment of the present application.

[0037] Main element symbol explanation: energy storage power supply 1000, battery pack 100, battery cell 10, electrode 11, positive electrode 111, negative electrode 112, support assembly 20, support 21, opening 211, first connecting column 212, first surface 213, second surface 214, first fixing hole 215, fixing part 216, electrical connector 22, first connecting end 221, second connecting end 222, bending part 2221, welding part 2222, main body 223, third connecting end 224, shell 200, second connecting column 210, second fixing hole 220, battery management module 300. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application. In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0039] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected, or electrically connected. It can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0041] The disclosure herein provides many different embodiments or examples for implementing different structures of the application. For the purpose of simplicity, the description of a particular embodiment or example within this document does not necessarily mean that all embodiments or examples have to include the components and features described in that particular embodiment or example. Of course, they are merely examples and are not intended to limit the application. In addition, the application can repeatedly refer to reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, the application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0042] The battery pack includes a plurality of battery cells, a bracket and busbars, the plurality of battery cells are fixed by the bracket, and the busbars are arranged on the bracket and welded with the electrodes of the battery cells. However, during the installation of the busbars, due to the large number of busbars, the busbars may be misconnected or short-circuited, which may cause the battery pack to be out of control and have a safety hazard.

[0043] Please refer to Figure 1 The application embodiment provides a kind of energy storage power supply 1000, energy storage power supply 1000 includes inverter and battery pack 100 connected electrically, battery pack 100 includes a plurality of battery cells 10 and bracket assembly 20, bracket assembly 20 includes integrally injection molded bracket 21 and electric connector 22, electric connector 22 is embedded in bracket 21, bracket 21 is formed with opening 211, bracket assembly 20 is configured to fix a plurality of battery cells 10 by bracket 21, so that the electrode 11 of a plurality of battery cells 10 is electrically connected with electric connector 22 by opening 211.

[0044] The battery pack 100 provided by the application directly integrally injection molds the electric connector 22 into the bracket 21, so that the fixation of the electric connector 22 is completed in advance, and the movement of the electric connector 22 caused by welding of the electric connector 22 and the electrode 11 of the battery cell 10 is avoided, so as to avoid short circuit and battery thermal runaway problems caused thereby, and facilitate to reduce safety hazards.

[0045] Specifically, please refer to Figures 1 to 4In the embodiment of the present application, the support 21 is provided with a first connecting column 212, and a plurality of first connecting columns 212 are arranged at the edges of the support 21.

[0046] The energy storage power supply 1000 further comprises a shell 200, and a plurality of second connecting columns 210 are arranged on the shell 200 corresponding to the positions of the first connecting columns 212. The number of the second connecting columns 210 is the same as that of the first connecting columns 212, and the second connecting columns 210 are arranged one by one corresponding to the first connecting columns 212.

[0047] In some embodiments, the first connecting columns 212 and the second connecting columns 210 are relatively long, and in order to improve the structural strength, the first connecting columns 212 are further provided with first reinforcing ribs on the side surfaces, the first reinforcing ribs are triangular or trapezoidal, one end of the first reinforcing rib is connected to the first connecting column 212, and the other end of the first reinforcing rib is connected to the first inner wall. Similarly, the second connecting columns 210 are further provided with second reinforcing ribs, the second reinforcing ribs are triangular or trapezoidal, one end of the second reinforcing rib is connected to the second connecting column 210, and the other end of the second reinforcing rib is connected to the second inner wall.

[0048] Further, each first connecting column 212 is connected with a plurality of first reinforcing ribs, and similarly, each second connecting column 210 is connected with a plurality of second reinforcing ribs. In some embodiments, each first connecting column 212 is connected with at least four first reinforcing ribs, and the four first reinforcing ribs are uniformly arranged on the side wall of the first connecting column 212. Similarly, each second connecting column 210 is connected with at least four second reinforcing ribs, and the four second reinforcing ribs are uniformly arranged on the side wall of the second connecting column 210.

[0049] Further, the first connecting columns 212 and the second connecting columns 210 can be detachably connected by fasteners to connect the support 21 and the shell 200, and the support 21 and the shell 200 form an installation area, and a plurality of battery cells 10 are installed in the installation area formed by the support 21 and the shell 200. Among them, bolt connection is one of the most common ways of fastening connection between the shell 200 and the support 21. The shell 200 and the support 21 are tightly connected together through the cooperation of the bolt and the nut. The bolt connection has the advantages of simple structure, convenient disassembly, strong carrying capacity, etc.

[0050] Further, according to the application requirements, different types of bolts can be selected, such as ordinary bolts, high-strength bolts, etc. High-strength bolts have better performance when bearing larger loads.

[0051] It should be noted that the fastening torque of the bolt connection is one of the key parameters, which needs to be calculated and set according to the specific materials and structures. The appropriate fastening torque can ensure the stability and safety of the connection.

[0052] In some embodiments, the shell 200 and the bracket 21 can also be connected by other connectors or fasteners. Among them, the connector is a component that connects the shell 200 and the bracket 21 together, such as a bolt, a nut, a washer, etc. The selection and installation of the connector have an important influence on the stability and safety of the connection. The connector material should have good mechanical properties and chemical stability to adapt to different working environments and load requirements. The size of the connector should be calculated and determined according to the size and load requirements of the shell 200 and the bracket 21.

[0053] The fastener is a component used to fix the connector, such as a wrench, a screwdriver, etc. The selection and use of the fastener have an important influence on the fastening degree and stability of the connection. According to the type and size of the connector, select the appropriate fastener. When using the fastener, the size of the fastening force needs to be controlled to ensure the stability and safety of the connection. Excessive fastening force may cause damage or deformation of the connector, and insufficient fastening force may cause the connection to be not firm.

[0054] In some embodiments, the shell 200 and the bracket 21 can also be connected by welding. Welded connection has the advantages of high connection strength and good sealing, but compared with bolt connection, it is more difficult to disassemble and maintain.

[0055] Further, according to the material and application requirements, different welding types can be selected, such as spot welding, seam welding, etc.

[0056] It should be noted that the welding quality directly affects the stability and safety of the connection. Therefore, during the welding process, the welding parameters and quality need to be strictly controlled to ensure that the welding quality meets the relevant standards and requirements.

[0057] Further, the first connecting column 212 and the bracket 21 are an integrated structure formed by one-piece machining, and similarly, the second connecting column 210 and the shell 200 are also an integrated structure formed by one-piece machining.

[0058] The electrical connector 22 is a busbar, which is a kind of equipment with high conductivity, high stability and reliability, used for concentrating or distributing electric current. In the field of electricity, the busbar is also called bus, busbar, etc., used for connecting multiple electrical lines. The busbar is made of high-conductivity material to ensure the efficiency of current transmission. The busbar also has good current carrying and transmission capacity, can quickly respond to power grid changes, and ensure the stable operation of the power grid.

[0059] The electric connection piece 22 can be connected to the positive pole 111 and the negative pole 112 of the at least one electric core 10 in turn and alternately, so that the positive pole 111 and the negative pole 112 connected to the two ends of the electric connection piece 22 are the positive connection port and the negative connection port respectively, that is, the electric connection piece 22 is connected in series with the at least one electric core 10, so that the at least one electric core 10 forms an output power supply with a large voltage, thereby ensuring that the power demand of the user is met.

[0060] In the embodiment of the present application, the middle part of the electric connection piece 22 is injection molded into the shell 200, the two ends of the electric connection piece 22 extend out of the opening 211, and are used to connect the electrode 11 of the electric core 10. The two ends of the electric connection piece 22 are connected to the electrode 11 of the electric core 10 by welding.

[0061] Please refer to Figure 1 In some embodiments, the electric connection piece 22 is embedded on the support 21 by a sleeve process.

[0062] In this way, the sleeve process is used to process the support assembly 20, which is beneficial to improve the production efficiency.

[0063] Specifically, the sleeve process, also known as vertical encapsulation or secondary forming, can create products with complex structures by means of multiple molds and precise injection molding equipment, and meet various design requirements. Moreover, the sleeve process can complete the assembly of multiple components in one forming, thereby greatly improving the production efficiency.

[0064] It should be noted that during the embedding of the electric connection piece 22 on the support 21 by the sleeve process, the mold should be cooled in time and sufficiently to avoid problems such as thermal deformation in the processing process and shrinkage deformation in the cooling process. In addition, the electric connection piece 22 and the support 21 need to select matching materials to ensure good adhesion. Generally, the matching materials should have similar chemical properties or contain matching composite components.

[0065] Please refer to Figure 2 and Figure 5 In some embodiments, the support 21 includes a first surface 213 and a second surface 214 opposite to the first surface 213, the opening 211 is arranged on the second surface 214, the support 21 is provided with a first fixing hole 215 on the first surface 213, the first fixing hole 215 is communicated with the opening 211, the electric connection piece 22 is embedded in the support 21 close to the second surface 214, and the electric core 10 is fixed in the first fixing hole 215, so that the electrode 11 is electrically connected to the electric connection piece 22.

[0066] In this way, the electric connection piece 22 is arranged close to the second surface 214, so that there is a gap between the electric connection piece 22 and the electric core 10, and the support 21 also forms a partition between the electric connection piece 22 and the electric core 10, thereby avoiding the short circuit of the electric core 10 caused by the accidental touch between the electric connection piece 22 and the electric core 10.

[0067] Specifically, in the embodiment of the present application, the inner surface of the support 21 close to the battery cell 10 is a first surface 213, and the outer surface away from the battery cell 10 is a second surface 214. The first surface 213 is provided with a first fixing hole 215, and the first fixing hole 215 is in one-to-one correspondence with the battery cell 10. One end of the electrode 11 of the battery cell 10 is inserted into the first fixing hole 215.

[0068] Further, the shell 200 is provided with a second fixing hole 220 corresponding to the position of the first fixing hole 215. The number of the second fixing hole 220 is the same as that of the first fixing hole 215, and the second fixing hole 220 is in one-to-one correspondence with the first fixing hole 215. The other end of the battery cell 10 is inserted into the second fixing hole 220.

[0069] In the embodiment of the present application, the positive electrode 111 and the negative electrode 112 of the battery cell 10 are arranged at the same end. The positive electrode 111 and the negative electrode 112 pass through the first fixing hole 215 and are arranged at the opening 211. The two ends of the electrical connecting piece 22 are arranged at the opening 211 and are welded to the electrode 11.

[0070] In some embodiments, in order to avoid the battery cell 10 from being unstable after being installed in the first fixing hole 215, glue can be filled in the first fixing hole 215 to glue the battery cell 10 in the first fixing hole 215. It should be noted that the glue should have good heat dissipation effect and should not melt easily at high temperature to avoid thermal runaway of the battery cell 10 and melting of the glue into other areas to cause failure of the battery pack 100. In addition, when using glue, the electrode 11 should not be in contact with the glue to affect the reliability of the electrical connection of the point set electrical connecting piece 22. At the same time, the glue should be non-conductive glue to avoid short circuit of the battery cell 10 when the glue is used.

[0071] Please refer to Figures 2 to 4 In some embodiments, the battery cell 10 is a cylindrical battery cell 10, the first fixing hole 215 is a circular hole matched with the battery cell 10, the opening 211 is a circular hole formed by the first fixing hole 215 passing through the second surface 214, and the support 21 further includes a fixing portion 216. The fixing portion 216 extends from the inner wall of the first fixing hole 215 close to the second surface 214 into the first fixing hole 215 along the extension direction of the electrical connecting piece 22. The electrical connecting piece 22 includes a first connecting end 221 extending from the fixing portion 216, and the first connecting end 221 is configured to be connected with the electrode 11.

[0072] In this way, the fixing portion 216 can block the battery cell 10 to prevent the battery cell 10 from falling out of the opening 211, and at the same time, it is beneficial to improve the stability of the electrical connecting piece 22.

[0073] Specifically, in the embodiment of the present application, the first fixing hole 215 and the opening 211 are both circular holes, wherein the diameter of the opening 211 is slightly smaller than the diameter of the first fixing hole 215, so as to avoid the battery cell 10 from sliding out of the opening 211.

[0074] The electric connector 22 comprises a first connecting end 221, which is used to connect the positive electrode 111 of the battery cell 10. In the embodiment of the present application, the positive electrode 111 of the battery cell 10 is an outwardly protruding pole, and the negative electrode 112 of the battery cell 10 is arranged around the root of the pole. In order to facilitate the electrical connection with the positive electrode 111, the first connecting end 221 is arranged in a spaced manner with the negative electrode 112 and is overlapped on the positive electrode 111 of the battery cell 10. Since the first connecting end 221 is arranged in a spaced manner with the negative electrode 112, there is a long overhanging section at the position, which is easy to cause unstable connection of the electric connector 22, and meanwhile, the position is easy to be touched by mistake with the negative electrode 112. Therefore, a fixing part 216 extending into the first fixing hole 215 along the extension direction of the electric connector 22 is arranged on the inner wall of the first fixing hole 215 close to the second surface 214. The fixing part 216 surrounds the root of the first connecting end 221 to stabilize the electric connector 22, and meanwhile, the fixing part 216 isolates the first connecting end 221 from the negative electrode 112 of the battery cell 10, so as to prevent the mistake touch.

[0075] Please refer to Figure 6 and Figure 7 In some embodiments, the electric connector 22 further comprises a second connecting end 222 away from the first connecting end 221, the second connecting end 222 extends into the corresponding opening 211, and the second connecting end 222 comprises a bending part 2221 bent towards the first surface 213 and a welding part 2222 connected with the bending part 2221 in a substantially perpendicular manner, the welding part 2222 is configured to be electrically connected with the electrode 11.

[0076] In this way, the second connecting end 222 is arranged close to the electrode 11, which facilitates the electrical connection between the second connecting end 222 and the electrode 11.

[0077] Specifically, in the embodiment of the present application, the second connecting end 222 is used to electrically connect the negative electrode 112 of the battery cell 10. Since there is a height difference between the negative electrode 112 and the positive electrode 111 of the battery cell 10, in order to facilitate the welding between the second connecting end 222 and the negative electrode 112, the second connecting end 222 is provided with a bending part 2221 bent into the opening 211, and the welding part 2222 is connected to the side of the bending part 2221 close to the negative electrode 112.

[0078] The electric connecting piece 22 is a sheet metal part. The sheet metal part refers to a metal product processed by a specific sheet metal process. This process is mainly aimed at metal sheets (usually below 6mm), including a series of comprehensive cold processing procedures such as shearing, punching / cutting / compounding, folding, welding, riveting, splicing, forming, etc. The sheet metal part is characterized by the same thickness of the same part. The sheet metal part has the characteristics of light weight, high strength, good electrical conductivity (can be used for electromagnetic shielding), low cost, and is suitable for large-scale mass production.

[0079] In this way, the sheet metal part usually has high tensile strength and compressive strength, which is beneficial to improve the service life of the connecting piece 22, and the sheet metal part has high processing efficiency, which is beneficial to shorten the processing period.

[0080] In the embodiments of the present application, the electric connecting piece 22 is formed by one-time stamping, and burrs that may occur during processing are removed, and the sharp corner part of the electric connecting piece 22 is rounded, thereby preventing the electric connecting piece 22 from injuring the hands of the operator during assembly or maintenance.

[0081] In other embodiments, the electric connecting piece 22 can also be processed and formed by other sheet metal processes, such as shearing and bending processing and forming, and the specific sheet metal process can be selected according to actual needs, which is not limited herein.

[0082] In some embodiments, the bent part 2221 is arranged along the edge of the opening 211.

[0083] In this way, the bent part 2221 abuts against the windowed edge, which is beneficial to make the electric connecting piece 22 more firmly fixed.

[0084] Specifically, in the present application, the opening 211 is circular, the bent part 2221 is arranged in a circular arc shape along the edge of the opening 211, and the welding part 2222 is arranged in a fan ring shape along the edge of the bent part 2221.

[0085] In some embodiments, the material of the first connecting end 221 is nickel, and the material of the second connecting end 222 is copper.

[0086] In this way, different materials are used to electrically connect different electrodes 11, which is beneficial to improve the service life of the first connecting end 221 and the second connecting end 222.

[0087] Specifically, the nickel sheet has high strength and toughness, and can withstand mechanical stress and vibration in the battery system. Copper has good ductility and plasticity, and is easy to process into various shapes and sizes to adapt to the needs of different battery systems. In the embodiment of the application, since the first connecting end 221 needs to be partially suspended, the first connecting end 221 is made of nickel, which helps to ensure reliable connection between the first connecting end 221 and the positive electrode 111 of the battery cell 10, and prevent current interruption caused by mechanical failure. The second connecting end 222 needs to be bent, so the second connecting end 222 is made of copper.

[0088] In some embodiments, the electrical connector 22 includes a main body 223, the first connecting end 221 and the second connecting end 222 are connected to the main body 223, the main body 223 is embedded on the support 21 by a sleeve plating process, the main body 223 is made of soft copper, and the first connecting end 221 and the second connecting end 222 are made of hard copper.

[0089] In this way, the main body 223 is made of soft copper with lower hardness, which is beneficial to eliminate welding errors.

[0090] Specifically, the first connecting end 221 and the positive electrode 111 of the battery cell 10 are connected by welding, and the second connecting end 222 and the negative electrode 112 of the battery cell 10 are connected by welding. During the welding process, the first connecting end 221 and the second connecting end 222 are easily affected by high temperature to produce thermal stress and thermal deformation. Therefore, in the embodiment of the application, the first connecting end 221 and the second connecting end 222 are made of hard copper, so as to reduce the thermal stress and thermal deformation of the first connecting end 221 and the second connecting end 222 caused by high temperature as much as possible. The main body 223 is made of soft copper to neutralize the thermal stress and thermal deformation of the first connecting end 221 and the second connecting end 222 caused by high temperature.

[0091] Please refer to Figure 8 In some embodiments, the electrical connector 22 includes a main body 223 and a third connecting end 224 bent and extended away from the support 21, the main body 223 is embedded on the support 21 by a sleeve plating process, the third connecting end 224 is connected to the main body 223, and the third connecting end 224 is electrically connected to the battery management module 300.

[0092] In this way, the third connecting end 224 is extended away from the support to form an operation space, which is convenient for connection with the battery management module 300.

[0093] Specifically, the battery management module 300 (Battery Management Module) refers to the core component of the battery pack 100, also known as the battery management system (Battery Management System, BMS). The battery management module 300 is used to monitor the voltage, current, temperature and other key parameters of the battery pack 100 in real time, as well as the remaining power (SOC) and health status (SOH) of the battery pack 100, and evaluate the battery performance and predict the battery life using these data.

[0094] In the embodiment of the present application, the electrical connection 22 includes a total positive connection and a total negative connection, the total positive connection includes a first connection end 221, a main body 223 and a third connection end 224 connected in sequence, and the first connection end 221 of the total positive connection is connected with the total positive electrode 111 of the series-connected multiple battery cells 10, and the total negative connection includes a second connection end 222, a main body 223 and a third connection end 224 connected in sequence, and the second connection end 222 of the total negative connection is connected with the total negative electrode 112 of the series-connected multiple battery cells 10.

[0095] In the embodiment of the present application, the third connection end 224 is bent and extended away from the support 21, which is convenient for welding with the battery management module 300, and at the same time, a certain interval is formed between the battery management module 300 and the top of the support 21, which can avoid the situation that the battery management module 300 contacts the top of the support 21 and mistakenly touches the electrical connection 22 or the electrode 11 of the battery cell 10 to cause short circuit, and on the other hand, the heat dissipation efficiency of the battery pack 100 can be improved.

[0096] In some embodiments, the main body 223 is made of aluminum, and the third connection end 224 is made of copper-nickel plating.

[0097] In this way, the connection end of the battery management module 300 is copper-nickel plated, the third connection end 224 is selected to be copper-nickel plated, which can ensure the service life of the product, and the third connection end 224 or the fourth connection end is made of aluminum, which can reduce the production cost.

[0098] Specifically, the welding of the same material has the same weld structure and performance as the workpiece base body, and there is no problem of interface reaction, intermediate layer or inclusions. The connection end of the battery management module 300 is copper-nickel plated, therefore, in the embodiment of the present application, the third connection end 224 is made of copper-nickel plated.

[0099] Further, since the cost of copper-nickel plating is high, therefore, the material of the part of the electrical connection 22 away from the third connection end 224 is selected to be a relatively cheap material, in the embodiment of the present application, the material of the part of the electrical connection 22 away from the third connection end 224 is aluminum, aluminum has good electrical conductivity and can carry large current, which meets the demand of the circuit for electrical conductivity, and aluminum has strong heat dissipation capacity and can maintain good performance stability in high temperature environment.

[0100] In the description of the present specification, the description of the terms "certain embodiments", "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0101] In addition, the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, unless otherwise explicitly specifically limited.

[0102] Although the embodiments of the present application have been shown and described above, it can be understood that the above-described embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized by, The battery pack comprises: a plurality of battery cells; a bracket assembly comprising a bracket integrally injection molded and an electrical connector embedded in the bracket, the bracket being formed with an opening, the bracket assembly being configured to fix the plurality of battery cells by the bracket so that electrodes of the plurality of battery cells are electrically connected with the electrical connector through the opening.

2. The battery pack of claim 1, wherein, The electrical connector is embedded in the bracket by a sleeve process.

3. The battery pack of claim 1, wherein, The bracket comprises a first surface and a second surface opposite to the first surface, the opening is arranged on the second surface, the bracket is provided with a first fixing hole on the first surface, the first fixing hole is communicated with the opening, the electrical connector is embedded in the bracket close to the second surface, and the battery cell is fixed in the first fixing hole so that the electrode is electrically connected with the electrical connector.

4. The battery pack of claim 3, wherein, The battery cell is a cylindrical battery cell, the first fixing hole is a circular hole matched with the battery cell, the opening is a circular hole formed by the first fixing hole penetrating through the second surface, and the bracket further comprises a fixing portion, the fixing portion extends from an inner wall of the first fixing hole close to the second surface to the first fixing hole in an extension direction of the electrical connector, the electrical connector comprises a first connecting end extending out of the fixing portion, and the first connecting end is configured to be connected with the electrode.

5. The battery pack of claim 4, wherein, The electrical connector further comprises a second connecting end away from the first connecting end, the second connecting end extends into the corresponding opening, the second connecting end comprises a bending portion bent towards the first surface and a welding portion connected with the bending portion substantially perpendicularly, and the welding portion is configured to be electrically connected with the electrode.

6. The battery pack of claim 5, wherein, The bending portion is arranged along an edge of the opening.

7. The battery pack of claim 5, wherein, The material of the first connecting end is nickel, and the material of the second connecting end is copper.

8. The battery pack of claim 5, wherein, The electrical connector comprises a main body, the first connecting end and the second connecting end are connected with the main body, the main body is embedded in the bracket by a sleeve process, the material of the main body is soft copper, and the materials of the first connecting end and the second connecting end are hard copper.

9. The battery pack of claim 4, wherein, The electrical connector comprises a main body and a third connecting end bent and extended away from the bracket, the main body is embedded in the bracket by a sleeve process, the third connecting end is connected with the main body, and the third connecting end is electrically connected with a battery management module.

10. The battery pack of claim 9, wherein, The material of the main body is aluminum, and the material of the third connecting end is copper plated with nickel.

11. An energy storage power supply, characterized by, The battery pack comprises the battery pack of any one of claims 1-10.

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