Detachable lithium battery module

Abstract

The utility model discloses a detachable lithium battery module. The detachable lithium battery module comprises a box body, a module, a magnetic connection bar, a battery management system circuit board and an upper cover, the module is positioned in the box body, the module comprises a plurality of battery cells, the plurality of battery cells are linearly arranged, and positive electrodes and negative electrodes of the adjacent battery cells are sequentially alternated along the arrangement direction; a plurality of magnetic connection rows, one magnetic connection row is arranged between each group of adjacent battery cells, and the magnetic connection rows are bridged between the different-name electrodes of the adjacent battery cells; an elastic buffer is arranged on the surface of the side, facing the module, of the battery management system circuit board and abuts against the magnetic attraction connecting row. And the upper cover is detachably connected with the box body. According to the invention, electrical connection between the battery cells is realized through the magnetic connection bar, and the reliability and maintainability of connection are improved. And the elastic buffer can effectively relieve the vibration and impact of the battery cell in the working process. And the box body and the upper cover are detachable, so that the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, specifically to a detachable lithium battery module. Background Technology

[0002] Lithium-ion battery systems are widely used in energy storage, communications, and power battery fields due to their high energy density. Currently, series and parallel connections between cells are mostly achieved through laser welding of connecting plates, but this connection method has a fatal flaw: once manufactured, it cannot be disassembled and maintained. If a single cell fails, the entire system is almost rendered unusable, causing huge losses and safety risks.

[0003] To address this issue, bolted connections are used in some cases. While these connections offer detachability, under complex operating conditions, vibration and long-term fatigue can easily cause the bolts to loosen or break, leading to connection failure. Both of these mainstream connection methods have significant limitations, restricting the reliability and maintainability of the battery system.

[0004] In summary, existing battery cell modules suffer from a technical problem that cannot balance reliability and ease of maintenance. Utility Model Content

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a detachable lithium battery module to solve the technical problem that the existing technology cannot balance reliability and ease of maintenance.

[0006] To achieve the above-mentioned technical objectives, this application adopts the following technical solution:

[0007] This application provides a detachable lithium battery module, including a housing, a module, a magnetic connector, a battery management system circuit board, and a top cover.

[0008] Box;

[0009] The module is located in the housing. The module includes multiple battery cells arranged linearly, with the positive and negative electrodes of adjacent battery cells alternating sequentially along the arrangement direction.

[0010] Multiple magnetic connection rows are provided, with one magnetic connection row between each group of adjacent cells, and the magnetic connection row is connected across the opposite electrodes of the adjacent cells;

[0011] A battery management system circuit board, wherein an elastic buffer is provided on one side surface of the battery management system circuit board facing the module, and the elastic buffer abuts against the magnetic connection bar;

[0012] The top cover is detachably connected to the box body.

[0013] In some embodiments of this application, the magnetic connection bar has a magnetic attraction area and at least two conductive areas on one side surface facing the module. The conductive areas are provided with conductive probes, and the magnetic attraction areas are provided with first magnetic blocks.

[0014] In some embodiments of this application, the conductive area is further provided with a plurality of conductive protrusions, which are distributed around the conductive probe, and the height of the conductive protrusions is less than the height of the conductive probe.

[0015] In some embodiments of this application, the top of the electrode of the battery cell is provided with a slot and a plurality of recesses, and the magnetic connection bar is electrically connected to the electrode of the battery cell by the conductive probe being embedded in the slot and the conductive protrusion being matched and embedded in the recesses.

[0016] In some embodiments of this application, the two conductive regions are spaced apart, the magnetic attraction region fills the space between the two conductive regions, and the first magnetic block is located between the two conductive probes.

[0017] In some embodiments of this application, two conductive regions are spaced apart, the magnetic attraction region fills the space between the two conductive regions and at least partially surrounds the two conductive regions, and at least two first magnetic blocks are located on both sides of the conductive probe.

[0018] In some embodiments of this application, a carrier is also included, wherein a plurality of through holes are provided on the carrier, the carrier covers the module and exposes the electrodes of the battery cell through the through holes, and a second magnetic block is provided on the side surface of the carrier away from the module, the second magnetic block being magnetically connected to the first magnetic block.

[0019] In some embodiments of this application, the battery management system circuit board is further provided with a positive terminal and a negative terminal, wherein the positive terminal and the negative terminal are disposed on the same side as the elastic buffer and are electrically connected to the battery cells at both ends respectively.

[0020] In some embodiments of this application, an adhesive connector is also included, wherein a groove is formed on the side of the top cover facing the box body, and the adhesive connector is filled in the groove and connects the top cover and the box body.

[0021] In some embodiments of this application, a snap-fit ​​connector is also included, which includes a detachably connected positioning member and a fastener, wherein the positioning member and the fastener are respectively connected to the housing and the top cover.

[0022] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include:

[0023] This application utilizes a magnetic connector to connect adjacent battery cells, achieving electrical connection between them. This not only avoids the non-removable nature of laser welding but also overcomes the loosening defects of bolted connections, significantly improving connection reliability and maintainability. The elastic buffer, in contact with the magnetic connector, effectively mitigates vibration and impact on the battery cells during operation, further ensuring system stability. The removable design of the housing and top cover facilitates quick replacement in case of cell failure, while also reducing maintenance costs and extending the battery system's lifespan. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the embodiments will be briefly described below:

[0025] Figure 1 This is an exploded view of a detachable lithium battery module according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the structure of a magnetic connection bar in an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of a module in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the structure of a carrier in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the structure of a battery management system circuit board in an embodiment of this application.

[0030] Figure label:

[0031] 1. Housing 2. Module 2. Battery cell 21. Slot 21a. Recess 21b. Magnetic connector 3. Conductive probe 31. First magnetic block 32. Conductive protrusion 33. Battery management system circuit board 4. Elastic buffer 41. Positive terminal connector 42. Negative terminal connector 43. Top cover 5. Carrier 6. Through hole 6a. Second magnetic block 61. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0033] Those skilled in the art will understand that, in this specification, the term "comprising" is an open-ended expression, meaning that the stated feature is present but other features are excluded. Directional terms such as "upper," "lower," "left," and "right" refer to exemplary directions based on the accompanying drawings. Features specified as "first" or "second" implicitly include one or more of that feature. Singular expressions can also be used in plural forms. "Multiple" means two or more. The terms "installed," "connected," and "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection via an intermediate medium, and it can be a connection within two components. Furthermore, "linked" can include wireless connections.

[0034] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a detachable lithium battery module 2 to solve the technical problem that the existing technology cannot balance reliability and ease of maintenance.

[0035] To achieve the above-mentioned technical objectives, this application adopts the following technical solution:

[0036] like Figures 1-5 As shown. This application provides a detachable lithium battery module 2, including a housing 1, a module 2, a magnetic connector 3, a battery management system circuit board 4, and a top cover 5.

[0037] Module 2 is located in the housing 1. Module 2 includes multiple battery cells 21 arranged linearly, with the positive and negative electrodes of adjacent battery cells 21 alternating sequentially along the arrangement direction. Multiple magnetic connection bars 3 are provided between each group of adjacent battery cells 21, and the magnetic connection bars 3 are connected across the opposite electrodes of adjacent battery cells 21. Using magnetic force, the magnetic connection bars 3 are attracted and pressed onto the two opposite electrodes, thereby realizing the electrical connection between the battery cells 21 and completing the series connection.

[0038] The surface of the battery management system (BMS) circuit board facing the module 2 is provided with an elastic buffer 41, which abuts against the magnetic connection bar 3. The elastic buffer 41 can press the magnetic connection bar tightly. This not only provides a certain pressure to ensure reliable connection, but also absorbs vibrations and shocks generated during the operation or transportation of the battery cell 21.

[0039] The top cover 5 is detachably connected to the housing 1. The module 2 has a non-permanent connection structure between the battery cells 21. After the top cover 5 and the housing 1 are removed, the battery cells 21 and the BMS board 4 can be easily disassembled and reused.

[0040] This application uses a magnetic connector 3 to connect adjacent battery cells 21, achieving electrical connection between the cells 21. This not only avoids the non-removable nature of laser welding but also overcomes the loosening defects of bolted connections, significantly improving the reliability and maintainability of the connection. The elastic buffer 41 abuts against the magnetic connector 3, effectively mitigating vibration and impact on the battery cells 21 during operation, further ensuring system stability. The housing 1 and the top cover 5 are detachable, facilitating quick replacement in case of battery cell 21 failure, while reducing maintenance costs and extending the battery system's lifespan.

[0041] In some embodiments of this application, the magnetic connection bar 3 has a magnetic attraction area and at least two conductive areas on the side surface facing the module 2. The conductive areas are provided with conductive probes 31, and the magnetic attraction areas are provided with first magnetic blocks 32.

[0042] After the battery cell 21 is installed in the required positive and negative terminal positions, the conductive probes 31 of the magnetic connector 3 are inserted into the positive and negative terminals of the battery cell 21, and the magnetic connector 3 and the positive and negative terminals of the battery cell 21 are connected in contact. The first magnetic block 32 in the magnetic attraction area uses magnetic force to attract the magnetic connector 3 between adjacent battery cells 21. The conductive probes 31 then contact the opposite electrodes of the adjacent battery cells 21 respectively to achieve electrical connection.

[0043] The magnetic block holds the probe in place, while the probe conducts electricity; this clear division of labor ensures a more reliable electrical connection. The probe design can be optimized to reduce resistance and improve durability. Magnetic force maintains the probe's contact pressure, providing strong vibration resistance.

[0044] In some embodiments of this application, the conductive area is further provided with a plurality of conductive protrusions 33, which are distributed around the conductive probe 31, and the height of the conductive protrusions 33 is less than the height of the conductive probe 31.

[0045] When the magnetic connector 3 comes into contact with the battery cell 21, the conductive probe 31 first establishes a primary, low-resistance current path with the electrodes of the battery cell 21. At the same time, the surrounding conductive protrusions 33 also come into contact with the surface of the battery cell 21.

[0046] Multiple protrusions significantly increase the contact area and the number of contact points, greatly improving the mechanical stability and electrical reliability of the connection, especially effectively preventing poor contact in vibration environments. Secondly, the additional contact points help disperse contact pressure and improve local heat dissipation, extending the service life of the connector and cell 21. Furthermore, this structure also enhances the dust and moisture resistance of the connection to a certain extent, improving the overall stability and environmental adaptability of the connection, making the battery module 2 work more reliably.

[0047] In some embodiments of this application, the top of the electrode of the battery cell 21 is provided with a slot 21a and a plurality of recesses 21b. The magnetic connection bar 3 is electrically connected to the electrode of the battery cell 21 by the conductive probe 31 being inserted into the slot 21a and the conductive protrusion 33 being fitted into the recesses 21b.

[0048] When the magnetic connector 3 is installed, its conductive probe 31 is precisely embedded in the slot 21a of the electrode, ensuring the main current path. Simultaneously, the conductive protrusion 33 on the connector is matched and embedded in the recess 21b on the electrode surface. This nested structure enables a stable and electrically sound connection between the connector and the electrode of the battery cell 21. This design significantly improves the reliability and consistency of the connection. It increases the contact area, reduces contact resistance, and the concave-convex fit improves connection reliability during vibration and enhances torsional resistance.

[0049] The slot 21a and recess 21b provide precise positioning and stable support for the conductive probe 31 and the protrusion, effectively preventing displacement or shaking of the connector during use and ensuring continuous and excellent electrical contact. At the same time, this embedded connection method further enhances the mechanical strength and sealing of the connection, helping it adapt to more complex working environments and extending the service life of module 2.

[0050] In some embodiments of this application, the two conductive regions are spaced apart, the magnetic attraction region fills the space between the two conductive regions, and the first magnetic block 32 is located between the two conductive probes 31.

[0051] During operation, the magnetic force of the magnetic attraction area attracts and fixes the entire connection bar to the surface of the cell 21. At the same time, the two conductive areas contact the opposite electrodes of the adjacent cells 21 to form a series circuit.

[0052] This layout allows for a more even distribution of magnetic force across the connector bar, enhancing overall adhesion stability and preventing it from tilting, especially under uneven force. Placing the magnetic block between the two conductive probes 31 helps balance the magnetic force, resulting in a more uniform force distribution across the connector bar. Simultaneously, this structure optimizes space utilization on the connector bar, leading to a more compact layout and facilitating design and manufacturing.

[0053] In some embodiments of this application, the two conductive regions are spaced apart, the magnetic attraction region fills the space between the two conductive regions and at least partially surrounds the two conductive regions, and at least two first magnetic blocks 32 are located on both sides of the conductive probe 31.

[0054] When the connector is working, these magnetic blocks together generate magnetic force, which firmly attracts the connector to the battery cell 21. At the same time, the magnetic blocks on both sides also ensure that the probe area is subjected to balanced force.

[0055] This design significantly enhances the adsorption stability and vibration resistance of the connector strip. The magnetic attraction area partially surrounds the conductive area, providing additional structural support and protecting the critical conductive probe 31 and the protrusion. The placement of two magnetic blocks on either side of the probe ensures a more uniform distribution of magnetic force, more effectively resisting forces from different directions, preventing the connector strip from tilting or shifting, and ensuring the long-term reliability of the electrical connection. This layout is particularly suitable for use in environments with significant vibration.

[0056] In some embodiments of this application, a carrier 6 is also included, on which a plurality of through holes 6a are provided. The carrier 6 covers the module 2 and exposes the electrodes of the battery cell 21 through the through holes 6a. A second magnetic block 61 is provided on the side surface of the carrier 6 away from the module 2. The second magnetic block 61 is magnetically connected to the first magnetic block 32.

[0057] The carrier 6 covers the module 2, and multiple through holes 6a on it expose the electrodes of the battery cell 21. A second magnetic block 61 is provided on the back of the carrier 6. These magnetic blocks attract each other with the first magnetic block 32 on the magnetic connection strip 3 to stably press the connecting piece and the positive and negative terminals of the battery cell 21. During installation, the magnetic connection strip 3 first adheres to the carrier 6 by its magnetic attraction, and then connects to the electrodes of the battery cell 21 through the through holes 6a.

[0058] Magnetic fixation greatly enhances the stability of the connector. The carrier 6 not only provides a flatter mounting surface for the connector, but also prevents it from accidentally falling off or shifting due to vibration or external force during use through the strong attraction between the second magnet 61 and the first magnet 32. The design of the through hole 6a ensures both the accuracy of the electrical connection and a more regular overall structure.

[0059] In some embodiments of this application, the battery management system circuit board 4 is further provided with a positive terminal 42 and a negative terminal 43. The positive terminal 42 and the negative terminal 43 are disposed on the same side as the elastic buffer 41 and are electrically connected to the battery cells 21 at both ends respectively.

[0060] Multiple battery cells 21 have their positive and negative terminals connected in series. The battery cells at both ends of the module 2 have one positive terminal and one negative terminal left unconnected, serving as the overall positive and negative terminals of the module 2. The BMS board 4 is equipped with corresponding magnetic positive terminal connectors 42 and magnetic negative terminal connectors 43, which are magnetically pressed together with the overall positive and negative terminals of the module 2, respectively. The assembly process is simple and maintainable.

[0061] The magnetic positive terminal connector 42 and magnetic negative terminal connector 43 on the BMS board 4 respectively engage with the holes and shafts of the upper cover 5, and are secured with top locking bolts. This improves the product's sealing performance and production line compatibility, reduces product development cycle and costs, and enhances assembly reliability.

[0062] In some embodiments of this application, an adhesive connector is also included, wherein the upper cover 5 has a groove on the side facing the box 1, and the adhesive connector is filled in the groove and connects the upper cover 5 and the box 1.

[0063] The groove is filled with an adhesive connector (such as hot melt adhesive). When the top cover 5 is installed, the adhesive connector cures, firmly bonding the top cover 5 to the housing 1. When disassembly is required, the adhesive connector is softened by heating (such as using a heat gun), allowing the top cover 5 to be separated from the housing 1.

[0064] This design achieves a secure yet detachable connection between the top cover 5 and the housing 1. Compared to traditional screws, the adhesive connection provides a more uniform seal and fixation, contributing to waterproofing and dustproofing. This is complemented by an internal design that does not employ laser welding and allows for the removable and replaceable battery cells 21. The heat-activated disassembly feature makes maintenance and repair of the battery module 2 (such as replacing battery cells 21) extremely convenient and quick, significantly reducing maintenance costs and difficulty, and improving the overall practicality and economy of the product.

[0065] In some embodiments of this application, a snap-fit ​​connector is also included, which includes a detachably connected positioning member and a fastener, wherein the positioning member and the fastener are respectively connected to the housing 1 and the top cover 5.

[0066] During installation, the top cover 5 is fastened onto the housing 1, the fasteners and positioning parts interlock, and the top cover 5 presses the sealing gasket to make it fit tightly against the edge of the housing 1 to form a seal.

[0067] This design combines the convenience of snap-fit ​​connections with the sealing performance of gaskets. The snaps ensure quick and secure installation and removal of the top cover 5 without tools, making operation extremely convenient. The gaskets effectively prevent dust, moisture, and other external environmental factors from entering the casing 1, protecting the battery cells 21 and circuitry within the module 2, thus improving the overall protection level and environmental adaptability of the lithium battery module 2. This combination makes the module 2 easy to maintain and reliably operate in various environments, balancing practicality and reliability.

[0068] In this embodiment, the assembly steps are as follows: First, stack multiple battery cells 21 in series with positive and negative terminals. Then, install the carrier 6 and the magnetic connector 3.

[0069] Next, install BMS board 4 to connect the positive and negative terminals and voltage / current acquisition interfaces of module 2. BMS board 4 has a buffer attached to it to secure the magnetic connectors.

[0070] Place module 2 into housing 1; then encapsulate the top cover 5, BMS board 4, and housing 1. The top cover 5 can be bonded to housing 1 using internal adhesive channels or connected using clips and sealing rings.

[0071] The BMS positive and negative output connectors and the five positive and negative tapered terminals on the top cover are secured with bolts.

[0072] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include:

[0073] This application uses a magnetic connector 3 to connect adjacent battery cells 21, achieving electrical connection between the cells 21. This not only avoids the non-removable nature of laser welding but also overcomes the loosening defects of bolted connections, significantly improving the reliability and maintainability of the connection. The elastic buffer 41 abuts against the magnetic connector 3, effectively mitigating vibration and impact on the battery cells 21 during operation, further ensuring system stability. The housing 1 and the top cover 5 are detachable, facilitating quick replacement in case of battery cell 21 failure, while reducing maintenance costs and extending the battery system's lifespan.

[0074] Those skilled in the art will understand that the steps, measures, and schemes in the various operations, methods, processes, and procedures discussed in this application can be alternated, modified, rearranged, decomposed, combined, or deleted.

[0075] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. A detachable lithium battery module, characterized in that, include: Box; The module is located in the housing. The module includes multiple battery cells arranged linearly, with the positive and negative electrodes of adjacent battery cells alternating sequentially along the arrangement direction. Multiple magnetic connection rows are provided, with one magnetic connection row between each group of adjacent cells, and the magnetic connection row is connected across the opposite electrodes of the adjacent cells; A battery management system circuit board, wherein an elastic buffer is provided on one side surface of the battery management system circuit board facing the module, and the elastic buffer abuts against the magnetic connection bar; The top cover is detachably connected to the box body.

2. The detachable lithium battery module according to claim 1, characterized in that, The magnetic connector array has a magnetic attraction area and at least two conductive areas on one side of the module. The conductive areas are provided with conductive probes, and the magnetic attraction areas are provided with a first magnetic block.

3. The detachable lithium battery module according to claim 2, characterized in that, The conductive area is further provided with a plurality of conductive protrusions, which are distributed around the conductive probe, and the height of the conductive protrusions is less than the height of the conductive probe.

4. The detachable lithium battery module according to claim 3, characterized in that, The top of the electrode of the battery cell is provided with a slot and multiple recesses. The magnetic connection bar is electrically connected to the electrode of the battery cell by the conductive probe being embedded in the slot and the conductive protrusion being matched and embedded in the recesses.

5. The detachable lithium battery module according to claim 3, characterized in that, The two conductive regions are spaced apart, the magnetic attraction area fills the space between the two conductive regions, and the first magnetic block is located between the two conductive probes.

6. The detachable lithium battery module according to claim 3, characterized in that, The two conductive regions are spaced apart, the magnetic attraction region fills the space between the two conductive regions and at least partially surrounds the two conductive regions, and at least two first magnetic blocks are located on both sides of the conductive probe.

7. The detachable lithium battery module according to claim 2, characterized in that, It also includes a carrier with multiple through holes, the carrier covers the module and exposes the electrodes of the battery cell through the through holes, and a second magnetic block is provided on the side surface of the carrier away from the module, the second magnetic block being magnetically connected to the first magnetic block.

8. The detachable lithium battery module according to claim 1, characterized in that, The battery management system circuit board is also provided with a positive terminal and a negative terminal. The positive terminal and the negative terminal are located on the same side as the elastic buffer and are electrically connected to the battery cells at both ends respectively.

9. The detachable lithium battery module according to claim 1, characterized in that, It also includes an adhesive connector, wherein the top cover has a groove on the side facing the box body, and the adhesive connector fills the groove and connects the top cover and the box body.

10. The detachable lithium battery module according to claim 1, characterized in that, It also includes a snap-fit ​​connector, which includes a detachably connected positioning element and a fastener, the positioning element and the fastener being connected to the housing and the top cover, respectively.

Images