Battery pack

Abstract

The application relates to a battery pack, which comprises a plurality of stacked battery cells, the surface of a pole is coated with a magnetized substance, an insulating upper cover is arranged opposite to the side of the plurality of battery cells with the pole, an electromagnetic induction assembly is connected to the insulating upper cover and is configured to generate an electromagnetic force after being electrified, a busbar assembly is connected to the side of the insulating upper cover close to the battery cell, one end of an elastic piece is connected to the insulating upper cover, when the electromagnetic induction assembly is electrified, the magnetized substance on the surface of the pole is magnetized, the busbar assembly is close to the pole under the action of the electromagnetic force, and the electromagnetic induction assembly is in contact with the pole, so that the busbar assembly is electrically connected with the pole; when the electromagnetic induction assembly is de-energized, the busbar assembly is away from the pole under the action of the elastic piece, so that the busbar assembly is disconnected with the pole. The problem that the traditional welding mode is difficult to disassemble is solved, and the battery pack has the advantages of convenient and quick disconnection, reduced maintenance cost and improved safety.

Description

Technical Field

[0001] This application relates to the field of electric vehicle battery technology, and in particular to a battery pack. Background Technology

[0002] As a core component for energy storage and conversion, batteries have been widely used in electric vehicles and other fields. At the same time, battery safety has always been a major concern.

[0003] Currently, most battery cell terminals and busbars in battery systems are fixedly connected using laser welding. While this connection method offers high reliability, it has significant drawbacks in practical applications. When a cell in the battery pack malfunctions and needs replacement, the welded connection is difficult to disassemble, often requiring destructive removal. This not only increases repair costs but may also damage adjacent, functioning cells. Utility Model Content

[0004] In view of this, embodiments of this application provide a battery pack to solve at least one problem existing in the background art.

[0005] In a first aspect, embodiments of this application provide a battery pack, the battery pack comprising:

[0006] A battery cell, wherein a plurality of said battery cells are stacked along a first direction, said battery cell having a terminal post, the surface of said terminal post being coated with a magnetizing material, wherein the first direction is the width direction of said battery cell;

[0007] An insulating top cover is disposed opposite to the side of the plurality of said cells having said terminals;

[0008] An electromagnetic induction component, connected to the side of the insulating cover near the battery cell, is configured to generate electromagnetic force when energized;

[0009] A bus assembly is connected to the side of the insulating cover near the battery cell and is opposite to the terminal post in a second direction, the second direction being the height direction of the battery cell;

[0010] An elastic element, one end of which is connected to the side of the insulating cover near the battery cell, and the direction in which the elastic element generates elastic force is the second direction;

[0011] When the electromagnetic induction component is energized, the magnetized material on the surface of the pole is magnetized, and the bus assembly approaches the pole under the action of electromagnetic force, so that the electromagnetic induction component comes into contact with the pole, thereby making the bus assembly electrically connected to the pole.

[0012] When the electromagnetic induction component is de-energized, the busbar assembly moves away from the pole under the action of the elastic member, thereby disconnecting the busbar assembly from the pole.

[0013] In conjunction with the first aspect of this application, in an optional embodiment, the electromagnetic induction component includes:

[0014] Electromagnetic column;

[0015] A spool, adapted to the electromagnetic post, and fitted onto the electromagnetic post;

[0016] Enamelled wire is wound around the spool, and the two ends of the enamelled wire are respectively used to connect to a power supply device;

[0017] When the enameled wire is energized, the electromagnetic post is magnetized and generates electromagnetic force, enabling it to move along the second direction and magnetically attract the pole post.

[0018] In conjunction with the first aspect of this application, in an optional embodiment, the insulating cover has a wiring groove, the extension of the enameled wire wound on the spool is located in the wiring groove, and its end is used to connect to the power supply device.

[0019] In conjunction with the first aspect of this application, in an optional embodiment, the battery pack further includes:

[0020] The data acquisition element is electrically connected to the bus assembly;

[0021] The acquisition harness is connected to the end of the acquisition component and located in the wiring groove.

[0022] In conjunction with the first aspect of this application, in an optional embodiment, the battery pack further includes:

[0023] An end plate is located outside the plurality of battery cells and is disposed opposite to the side of the battery cells;

[0024] A terminal block is connected to the side of the end plate away from the battery cell. The terminal block has at least three pairs of connection terminals, which are respectively connected to the acquisition harness, the positive and negative wire harnesses of the enameled wire, and the output harness of the positive and negative wire harnesses.

[0025] In conjunction with a first aspect of this application, in an alternative embodiment, the bus assembly includes:

[0026] Positive busbar, wherein the positive busbar is the electromagnetic post corresponding to the positive post of the battery cell located at the head in the first direction;

[0027] The negative busbar is the electromagnetic post corresponding to the negative post of the battery cell located at the tail end in the first direction;

[0028] A connecting bar includes a connecting arm, the connecting arm being connected between the electromagnetic posts corresponding to the poles of adjacent cells, and the connecting arm and the two electromagnetic posts forming the connecting bar;

[0029] When the electromagnetic induction component is energized, the positive busbar, the connecting busbar, and the negative busbar enable electrical connection between the multiple battery cells.

[0030] In conjunction with the first aspect of this application, in an optional embodiment, both the electromagnetic post and the pole post are cylindrical, and the inner wall of the electromagnetic post is adapted to the shape of the pole post. When the electromagnetic induction component is energized, the electromagnetic post is fitted onto the pole post and comes into contact with it.

[0031] In conjunction with the first aspect of this application, in an alternative embodiment, the connecting arm is integrally formed with the two electromagnetic posts connected thereto.

[0032] In conjunction with the first aspect of this application, in an optional embodiment, the electromagnetic post includes an integrally formed mounting post and a sleeve post, the sleeve post having a sleeve groove for fitting onto the pole post; the mounting post is connected to the end of the sleeve post away from the battery cell, the spool is fitted onto the mounting post, and the outer diameter of the mounting post is smaller than the outer diameter of the sleeve post.

[0033] In conjunction with the first aspect of this application, in an optional embodiment, the battery pack further includes:

[0034] A sleeve is connected to the insulating cover and fitted onto the elastic element, wherein, in the second direction, the length of the elastic element is greater than the length of the sleeve.

[0035] The battery pack provided in this application achieves electrical connection by driving the bus assembly to contact the cell terminals through the electromagnetic force generated when the electromagnetic induction component is energized. When the power is off, the connection is automatically disconnected by the elastic element, which solves the problem of difficult disassembly by traditional welding methods. It has the advantages of easy and quick disconnection, reduced maintenance costs and improved safety.

[0036] Furthermore, a reversible electrical connection mechanism is constructed through the synergistic effect of electromagnetic adsorption and elastic reset. Additionally, in the event of overcurrent or thermal runaway in the battery system, this application can achieve millisecond-level active power-off by cutting off the electromagnetic power supply, exhibiting a faster response speed.

[0037] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0039] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in the embodiments of this application;

[0040] Figure 2 This is an exploded view of the battery pack structure provided in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the structure of the insulating top cover and busbar assembly in the battery pack provided in the embodiments of this application;

[0042] Figure 4 This is a schematic diagram of the structure of the insulating top cover in the battery pack provided in the embodiments of this application;

[0043] Figure 5 An exploded view of the structure of the electromagnetic induction component in the battery pack provided in an embodiment of this application;

[0044] Figure 6 An exploded view of the structure of the electromagnetic induction component in a battery pack provided in another embodiment of this application;

[0045] Figure 7 This is a schematic diagram of the structure of the electromagnetic column in the battery pack provided in an embodiment of this application.

[0046] Figure label:

[0047] 100. Battery pack;

[0048] 10. Battery cell; 11. Terminal; 111. Positive terminal; 112. Negative terminal;

[0049] 20. Insulating top cover; 21. Cable tray;

[0050] 31. Electromagnetic induction component; 311. Electromagnetic post; 3111. Mounting post; 3112. Mounting post; 3113. Mounting slot; 312. Bollard; 313. Enamelled wire; 3131. Positive wire harness; 3132. Negative wire harness; 3133. Output wire harness;

[0051] 32. Busbar assembly; 321. Positive busbar; 322. Negative busbar; 323. Connecting busbar; 3231. Connecting arm;

[0052] 41. Elastic element; 411. Compression spring; 42. Sleeve;

[0053] 51. Data acquisition component; 52. Data acquisition harness;

[0054] 60. End plate; 61. Terminal block; 611. Connecting terminal. Detailed Implementation

[0055] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0056] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this utility model.

[0057] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly indicate that at least one of those features is included. In the description of this utility model, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; 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 also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0060] Please refer to Figures 1 to 3 This application provides a battery pack 100, which includes a battery cell 10, an insulating cover 20, an electromagnetic induction component 31, a busbar component 32, and an elastic element 41.

[0061] Among them, multiple battery cells 10 are arranged along the first direction (i.e., Figure 1 The cells 10 are stacked in the X-axis direction of the coordinate system shown in the figure. The surface of the terminal post 11 of the cell 10 is coated with a magnetized material. The insulating cover 20 is disposed opposite to the terminal post 11 of the cell 10. The electromagnetic induction component 31 and the bus assembly 32 are mounted on the insulating cover 20. The elastic element 41 is mounted on the insulating cover 20 and generates elastic force along the height direction. When the electromagnetic induction component 31 is energized, it magnetizes the terminal post 11 and drives the bus to make contact and conduct. When the power is off, the elastic element 41 pushes the bus to disengage from the terminal post 11.

[0062] In this embodiment, the stacked arrangement of battery cells 10 refers to multiple battery cells 10 arranged parallel to each other along the width direction, which is beneficial for improving space utilization. The magnetized material on the surface of the electrode post 11 refers to a coating material with ferromagnetic properties, such as neodymium iron boron permanent magnet material, iron oxide nanoparticles, or iron fluoride, which can generate a magnetic attraction effect under the action of a magnetic field. The insulating cover 20 refers to a support structure made of engineering plastic or ceramic material, used to fix the electromagnetic induction component 31 and achieve electrical isolation. The electromagnetic induction component 31 refers to a device that generates a magnetic field after being energized, such as an electromagnet structure containing coil windings, used to drive the busbar to move. The busbar assembly 32 refers to a connecting component made of conductive metal, such as a copper alloy busbar, used to establish a current path between the battery cells 10. The elastic element 41 refers to a mechanical element with axial elastic force, such as a compression spring 411 and an elastic rubber column, used to provide a reset driving force.

[0063] When the battery system is operating normally, the electromagnetic induction component 31 generates a magnetic field when energized, magnetizing the magnetized material on the surface of the terminal 11. The magnetic force drives the busbar assembly 32 to move along the height direction until it makes physical contact with the terminal 11, establishing a stable electrical connection. At this time, multiple cells 10 form a series or parallel circuit through the busbar assembly 32. When disconnection is required, the power supply to the electromagnetic induction component 31 is cut off. After the magnetic field disappears, the elastic element 41 releases its stored elastic potential energy, pushing the busbar assembly 32 to move in the opposite direction, completely detaching it from the terminal 11. This process requires no physical cutting or heating for desoldering; the connection state can be quickly switched through electromagnetic control.

[0064] The battery pack 100 described above establishes a reversible electrical connection mechanism through the synergistic effect of electromagnetic adsorption and elastic reset. Furthermore, in the event of overcurrent or thermal runaway in the battery system, this embodiment can achieve millisecond-level active power-off by cutting off the electromagnetic power supply, providing a faster response speed compared to traditional fuse protection.

[0065] In one alternative embodiment, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 The electromagnetic induction component 31 includes an electromagnetic post 311, a spool 312, and an enameled wire 313. The spool 312 is adapted to and fitted onto the electromagnetic post 311, and the enameled wire 313 is wound around the spool 312, with its two ends connected to a power supply device. When the enameled wire 313 is energized, the electromagnetic post 311 is magnetized and generates electromagnetic force, moving along the height direction of the battery cell 10 and magnetically attracting the pole piece 11.

[0066] In this embodiment, the electromagnetic post 311 refers to a columnar component that generates axial electromagnetic force after being magnetized, and the electromagnetic post 311 may be made of aluminum alloy. The spool 312 refers to a support structure used to fix the winding path of the enameled wire 313, and can be injection molded from insulating material, such as nylon or polycarbonate. Its inner hole forms a clearance fit with the outer diameter of the electromagnetic post 311 to ensure the axial movement freedom of the electromagnetic post 311. The enameled wire 313 refers to a conductive coil with an insulating varnish layer on its surface, and can be made of copper core or aluminum core wire. Its winding direction is parallel to the axis of the spool 312, and a closed magnetic circuit is formed inside the spool 312 after energization.

[0067] When the enameled wire 313 is energized, the current flowing through the coil generates a ring-shaped magnetic field. This magnetic field is transmitted to the electromagnetic post 311 through the spool 312, magnetizing it. The magnetized electromagnetic post 311 generates an axial electromagnetic force, driving it to move along the height direction of the battery core 10. At this time, the front end of the electromagnetic post 311 and the magnetized material on the surface of the pole post 11 are magnetically attracted, forming physical contact. During the contact process, a conductive path is formed at the contact surface between the electromagnetic post 311 and the pole post 11, realizing the electrical connection between the bus assembly 32 and the pole post 11. After the power is turned off, the electromagnetic post 311 loses its magnetism and resets and detaches from the pole post 11 under the action of the elastic element 41.

[0068] The battery pack 100 described above enables controllable connection and disconnection between the battery cell 10 terminals 11 and the bus assembly 32. During battery cell 10 maintenance, simply cutting off the power supply to the enameled wire 313 automatically detaches the electromagnetic post 311 from the terminal 11, eliminating the need for welding point cutting. This structure effectively solves the problem of difficult disassembly of the battery cell 10 caused by traditional welding processes, while ensuring reliable contact during electrical connections.

[0069] It should be noted that when the enameled wire 313 is energized, the magnitude of the electromagnetic force generated by the magnetization of the electromagnetic post 311 can be set according to specific circumstances. Of course, the magnitude of the electromagnetic force is greater than the spring force of the elastic element 41. The magnitude of the electromagnetic force generated by the magnetization of the electromagnetic post 311 can be set based on parameters such as the diameter of the enameled wire 313 and the number of turns of the enameled wire 313 wound on the spool 312.

[0070] Specifically, when the battery system is working, the electric vehicle's main battery manages the charging and discharging process of the high-voltage battery system through the control system. When the vehicle is charging, the control system sends a command to the drive power control unit through the low-voltage circuit, thereby controlling the closure of the newly added control relay in the BDU (Battery Disconnection Unit). After the control relay in the BDU is activated (also known as closed), a current is generated that reaches the enameled wire 313. A certain current flows through the enameled wire 313, thereby generating an electromagnetic effect. Under the attraction of the electromagnetic force, the electromagnetic post 311 overcomes the rebound force of the elastic element 41 and is attracted to the terminal 11 of the cell 10, thereby realizing the conduction of the battery system current and ensuring the normal charging of the high-voltage battery system. After the control relay in the BDU is deactivated, that is, no current flows through the enameled wire 313, and the attraction of the electromagnetic force also disappears. Under the reaction force of the elastic element 41, the electromagnetic post 311 returns to its original position, so that the contact surface between the electromagnetic post 311 and the terminal 11 of the cell 10 is completely separated, further realizing the power outage of the battery system.

[0071] The control relay in this embodiment is a new addition to the existing BDU, used to control the enameled wire 313 circuit, and is on a different circuit than the relay in the battery high-voltage circuit. This relay enables precise and independent control of the enameled wire 313, simplifying the overall system design and improving system reliability and maintainability. In emergencies, such as when the battery pack 100 malfunctions or a vehicle collision occurs, the enameled wire 313 circuit can be quickly disconnected, reducing safety risks. It also provides redundancy, ensuring that the enameled wire 313 circuit can continue to operate normally even if the main control circuit fails, further improving system reliability. Furthermore, the control relay enables fault detection of the enameled wire 313 circuit; for example, by detecting the state of the control relay, it can determine whether the enameled wire 313 circuit is operating normally, allowing for timely detection and handling of abnormalities.

[0072] The aforementioned control relays can be applied to pure electric battery systems (BEV), plug-in hybrid electric systems (PHEV), full hybrid electric systems (HEV), and range-extended electric vehicles (EREV).

[0073] In one alternative embodiment, please refer to Figure 4 The insulating cover 20 has a cable tray 21. The extension of the enameled wire 313 wound on the spool 312 is located in the cable tray 21, and its end is used to connect to the power supply device.

[0074] In this embodiment, the wiring groove 21 refers to a recessed structure formed on the surface of the insulating cover 20, which can be achieved by injection molding to form a groove of a specific depth on the insulating material. This groove accommodates the extension wire of the enameled wire 313, physically confining the wire within a fixed path to prevent friction or displacement with surrounding components. The extension wire of the enameled wire 313 refers to the conductor portion that extends from the winding portion of the spool 312 and connects to the power supply device; specifically, it can be made of copper core enameled wire 313 or alloy wire. The end of the extension wire is fixed to the terminal block of the power supply device by welding or crimping to ensure continuous current transmission.

[0075] In this embodiment, the enameled wire 313 extension wire is oriented and stored inside the insulating cover 20 through the integrated wiring trough 21 structure. This not only avoids messy wiring distribution, but also achieves mechanical isolation through the trough structure, improving the regularity of the wiring layout and anti-interference ability, and enhancing wiring safety and maintenance convenience.

[0076] In one alternative embodiment, please refer to Figure 1 and Figure 2 The battery pack 100 also includes a data acquisition unit 51 and a data acquisition harness 52. The data acquisition unit 51 is electrically connected to the bus assembly 32; the data acquisition harness 52 is connected to the end of the data acquisition unit 51 and is located in the wiring trough 21.

[0077] In this embodiment, the acquisition component 51 can be a signal acquisition component 51 of the battery cell 10 or a temperature acquisition plug-in. The acquisition component 51 is connected to the electromagnetic post 311 by laser welding, but it is not limited to this. In addition, the electromagnetic post 311, the elastic element 41, and the insulating cover 20 can be injection molded by insert molding process, but it is not limited to this.

[0078] In an optional embodiment, the battery pack 100 further includes an end plate 60 and a terminal block 61. The end plate 60 is located outside the plurality of battery cells 10 and is disposed opposite to the side of the battery cells 10. The terminal block 61 is connected to the side of the end plate 60 away from the battery cells 10. The terminal block 61 is provided with at least three pairs of connecting terminals 611. The three pairs of connecting terminals 611 are respectively connected to the positive terminal bundle 3131 and negative terminal bundle 3132 of the acquisition harness 52 and the output terminal bundle 3133 of the enameled wire 313 and the negative terminal bundle 3132.

[0079] In this embodiment, the end plate 60 is disposed on the end side of the battery cell 10 group, and the terminal block 61 can be connected to the end plate 60 by pre-embedded bolts. The terminal block 61 is fixed to the outside of the end plate 60, and is connected to the positive and negative wires 3131 and the output wires 3133 of the acquisition harness 52 and the enameled wire 3133, respectively, through three pairs of connecting terminals 611. The output wires 3133 are used to connect to the relay inside the BDU. The acquisition harness 52 is used to transmit the status monitoring signal of the battery cell 10, and can be connected to the BMS through other wires, which is not limited here. The enameled wire 313 is used to supply power to the electromagnetic induction component 31, and the positive and negative lines of the two are connected separately and integrated through the terminal block 61. When maintenance or replacement of the battery cell 10 is required, the line can be separated by disconnecting the standardized connecting terminals 611 on the terminal block 61, without disassembling the wires inside the battery cell 10 stack structure. The embodiments of this application simplify the line separation operation during maintenance through the collaborative design of the end plate 60 and the terminal block 61.

[0080] In one alternative embodiment, please refer to Figures 2 to 6 The busbar assembly 32 includes a positive busbar 321, a negative busbar 322, and a connecting busbar 323. The positive busbar 321 is the electromagnetic post 311 corresponding to the positive post 111 of the battery cell 10 located at the head in the first direction; the negative busbar 322 is the electromagnetic post 311 corresponding to the negative post 112 of the battery cell 10 located at the tail in the first direction; the connecting busbar 323 includes a connecting arm 3231, which connects between the electromagnetic posts 311 corresponding to the posts 11 of adjacent battery cells 10, and the connecting arm 3231 and the two electromagnetic posts 311 form the connecting busbar 323; when the electromagnetic induction assembly 31 is energized, the positive busbar 321, the connecting busbar 323, and the negative busbar 322 realize the electrical connection between multiple battery cells 10.

[0081] In this embodiment, when the electromagnetic induction component 31 is energized, all electromagnetic posts 311 synchronously generate a magnetic attraction. The electromagnetic post 311 corresponding to the positive busbar 321 attracts the positive post 111 of the head cell 10, and the electromagnetic post 311 corresponding to the negative busbar 322 attracts the negative post 112 of the tail cell 10. The connecting arm 3231 connects the electromagnetic posts 311 corresponding to the poles 11 of the middle cell 10 in series, forming a complete conductive circuit from the head to the tail. During this process, the contact pressure between the electromagnetic post 311 and the pole 11 is maintained by electromagnetic force. When the power is off, the elastic element 41 pushes the busbar assembly 32 to detach from the pole 11, so that each cell 10 is in an electrically isolated state.

[0082] Furthermore, both the electromagnetic post 311 and the pole post 11 are cylindrical, and the inner wall of the electromagnetic post 311 is adapted to the shape of the pole post 11. When the electromagnetic induction component 31 is energized, the electromagnetic post 311 is fitted onto the pole post 11 and comes into contact with it.

[0083] In this embodiment, both the electromagnetic post 311 and the pole post 11 are cylindrical. This allows the cylindrical electromagnetic post 311 and pole post 11 to guide each other as the electromagnetic post 311 moves along its axis, achieving precise positioning and reducing contact surface misalignment. Furthermore, the cylindrical fit together forms a stable contact surface, significantly improving conductivity stability and preventing localized overheating caused by poor contact.

[0084] In an optional embodiment, the connecting arm 3231 is integrally formed with two electromagnetic posts 311 connected thereto. The connecting arm 3231 refers to the conductive structural component connecting the electromagnetic posts 311 corresponding to the pole posts 11 of adjacent cells 10. Specifically, it can be integrally formed from aluminum alloy through a stamping process, and is used to form a continuous current path between adjacent electromagnetic posts 311. The integrally formed connecting arm 3231 and the electromagnetic posts 311 will not have relative displacement, ensuring the integrity of the current conduction path.

[0085] In one alternative embodiment, please refer to Figure 7 The electromagnetic post 311 includes an integrally formed mounting post 3111 and a sleeve post 3112. The sleeve post 3112 has a sleeve groove 3113 for fitting onto the pole post 11. The mounting post 3111 is connected to the end of the sleeve post 3112 away from the battery cell 10. The spool 312 is fitted onto the mounting post 3111. The outer diameter of the mounting post 3111 is smaller than the outer diameter of the sleeve post 3112. The mounting post 3111 and the sleeve post 3112 can be formed into an integral structure by casting or machining. Specifically, they can be formed in one piece using metal materials through a mold, avoiding connection gaps caused by separate structures. The sleeve groove 3113 of the sleeve post 3112 directly fits onto the surface of the pole post 11, achieving automatic alignment through shape matching, avoiding contact problems caused by manual adjustment.

[0086] In one alternative embodiment, please refer to Figure 2 and Figure 3 The battery pack 100 also includes a sleeve 42, which is connected to the insulating cover 20 and fitted onto the elastic member 41. In the second direction, the length of the elastic member 41 is greater than the length of the sleeve 42. The inner diameter of the sleeve 42 and the outer diameter of the elastic member 41 form a clearance fit to restrain the radial displacement of the elastic member 41 during compression and extension.

[0087] The length of the elastic element 41 being greater than the length of the sleeve 42 means that the total height of the elastic element 41 in the second direction in its naturally extended state exceeds the axial dimension of the sleeve 42. Specifically, this can be achieved by having the free length of the spring be greater than the height of the sleeve 42 by a preset margin, ensuring that the sleeve 42 only limits the compression stroke of the elastic element 41 without interfering with its fully extended state.

[0088] The sleeve 42 in this embodiment can prevent the elastic element 41 from shifting due to force during compression or extension, and can effectively maintain the effective stroke of the elastic element 41.

[0089] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A battery pack, characterized in that, The battery pack (100) includes: A battery cell (10), a plurality of said battery cells (10) are stacked along a first direction, said battery cell (10) has a terminal post (11), the surface of said terminal post (11) is coated with a magnetizing material, and the first direction is the width direction of said battery cell (10); An insulating top cover (20) is disposed opposite to the side of the plurality of said cells (10) having said poles (11); An electromagnetic induction component (31), connected to the insulating cover (20) on the side near the battery cell (10), is configured to generate electromagnetic force when energized; Busbar assembly (32) is connected to the side of the insulating cover (20) near the cell (10) and is opposite to the position of the pole (11) in a second direction, which is the height direction of the cell (10); An elastic element (41) is connected at one end to the side of the insulating cover (20) near the battery cell (10), and the direction in which the elastic element (41) generates elastic force is the second direction; When the electromagnetic induction component (31) is energized, the magnetized material on the surface of the pole (11) is magnetized, and the bus assembly (32) approaches the pole (11) under the action of electromagnetic force, so that the electromagnetic induction component (31) comes into contact with the pole (11) and the bus assembly (32) is electrically connected to the pole (11). When the electromagnetic induction component (31) is de-energized, the bus assembly (32) moves away from the pole post (11) under the action of the elastic member (41), so that the bus assembly (32) is disconnected from the pole post (11).

2. The battery pack according to claim 1, characterized in that, The electromagnetic induction component (31) includes: Electromagnetic column (311); A spool (312) is adapted to the electromagnetic post (311) and is fitted onto the electromagnetic post (311). Enamelled wire (313) is wound around the spool (312), and the two ends of the enamelled wire (313) are respectively used to connect to the power supply device; When the enameled wire (313) is energized, the electromagnetic post (311) is magnetized and generates electromagnetic force, so that it can move along the second direction and magnetically attract the pole post (11).

3. The battery pack according to claim 2, characterized in that, The insulating cover (20) has a wiring groove (21), and the extension of the enameled wire (313) wound on the spool (312) is located in the wiring groove (21), and its end is used to connect to the power supply device.

4. The battery pack according to claim 3, characterized in that, The battery pack (100) also includes: The acquisition element (51) is electrically connected to the bus assembly (32); The acquisition harness (52) is connected to the end of the acquisition component (51) and located in the wiring groove (21).

5. The battery pack according to claim 4, characterized in that, The battery pack (100) also includes: An end plate (60) is located outside the plurality of said cells (10) and is disposed opposite to the side of said cells (10); Terminal block (61) is connected to the side of the end plate (60) away from the battery cell (10). The terminal block (61) is provided with at least three pairs of connection terminals (611). The three pairs of connection terminals (611) are respectively connected to the acquisition harness (52), the positive wire harness (3131) and negative wire harness (3132) of the enameled wire (313), and the output wire harness of the positive wire harness (3131) and negative wire harness (3132).

6. The battery pack according to any one of claims 2 to 5, characterized in that, The bus assembly (32) includes: Positive busbar (321), the positive busbar (321) is the electromagnetic post (311) corresponding to the positive post (111) of the battery cell (10) located at the head in the first direction. The negative busbar (322) is the electromagnetic post (311) corresponding to the negative post (112) of the battery cell (10) located at the tail in the first direction. The connecting bar (323) includes a connecting arm (3231), which is connected between the electromagnetic posts (311) corresponding to the pole posts (11) of the adjacent cells (10). The connecting arm (3231) and the two electromagnetic posts (311) constitute the connecting bar (323). When the electromagnetic induction component (31) is energized, the positive busbar (321), the connecting busbar (323) and the negative busbar (322) realize the electrical connection between the multiple battery cells (10).

7. The battery pack according to claim 6, characterized in that, Both the electromagnetic column (311) and the pole column (11) are cylindrical, and the inner wall of the electromagnetic column (311) is adapted to the shape of the pole column (11). When the electromagnetic induction component (31) is energized, the electromagnetic column (311) is fitted onto the pole column (11) and comes into contact with it.

8. The battery pack according to claim 6, characterized in that, The connecting arm (3231) is integrally formed with the two electromagnetic columns (311) connected thereto.

9. The battery pack according to claim 6, characterized in that, The electromagnetic post (311) includes an integrally formed mounting post (3111) and a sleeve post (3112). The sleeve post (3112) is provided with a sleeve groove (3113) for fitting onto the pole post (11). The mounting post (3111) is connected to the end of the sleeve post (3112) away from the battery cell (10). The spool (312) is fitted onto the mounting post (3111). The outer diameter of the mounting post (3111) is smaller than the outer diameter of the sleeve post (3112).

10. The battery pack according to claim 1, characterized in that, The battery pack (100) also includes: A sleeve (42) is connected to the insulating cover (20) and fitted onto the elastic member (41), wherein the length of the elastic member (41) is greater than the length of the sleeve (42) in the second direction.

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