Phase change heat spreading battery pack and device

Abstract

The utility model provides a kind of battery pack and equipment of phase change heat dissipation, it is related to battery technology field, and the battery pack of phase change heat dissipation includes: box body;Box cover;Fixed beam;Battery frame;Multiple electric core, adjacent electric core is clamped with phase change sheet, phase change sheet and electric core are alternately arranged in battery frame, adjacent phase change sheet and electric core are filled with heat conduction layer;BMS component is installed in the side surface of battery frame.The application directly clamps phase change sheet between electric core, utilizes its phase change latent heat high-efficiency absorption battery heating, and combines high thermal conductivity interface layer to strengthen heat conduction, improves heat dissipation efficiency.Meanwhile, the application cancels traditional air duct or liquid cooling pipeline, and replaces mechanical isolation structure with phase change sheet, realizes battery pack volume reduction, effectively solves the temperature rise problem of small equipment or compact vehicle battery under high rate, high power working condition, guarantees battery power supply stability, prolongs battery cycle life, ensures that equipment continues reliable operation.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack and device for phase change heat dissipation. Background Technology

[0002] To ensure that batteries operate within a suitable temperature range, thermal management is necessary. Based on the heat transfer medium, the three main methods of battery thermal management are air cooling, liquid cooling, and phase change material cooling.

[0003] Air cooling utilizes air for battery thermal management, offering advantages such as simple structure and low cost. However, its heat dissipation efficiency is low, failing to meet the battery pack's cooling requirements under high-capacity, high-rate, and high-power operation. Furthermore, its air duct occupies a large volume, reducing the overall energy density of the battery pack. Liquid cooling uses a highly thermally conductive liquid to contact the battery module for heat dissipation. Liquid cooling offers high heat dissipation efficiency, but the system is complex and costly, making it suitable for large equipment and vehicles. Small equipment or vehicles lack the necessary liquid cooling systems for their batteries. Utility Model Content

[0004] The main purpose of this invention is to propose a phase change heat dissipation battery pack and device, which aims to solve the problems of insufficient heat dissipation, large space occupation, and system complexity of traditional battery heat management solutions.

[0005] To achieve the above objectives, this application proposes a phase-change heat dissipation battery pack, comprising: The box body is provided with a receiving cavity and a box opening communicating with the receiving cavity; A lid, covering the opening of the box; At least two fixed beams are disposed within the receiving cavity, and the receiving cavity is divided into a first installation space and a second installation space according to the position of the fixed beams; A battery frame is disposed in the first mounting space; Multiple battery cells are provided, with phase change plates sandwiched between adjacent battery cells. The phase change plates and battery cells are alternately arranged within the battery frame. A thermally conductive layer is filled between adjacent phase change plates and battery cells. The multiple battery cells are electrically connected to each other through conductive components. A BMS component is disposed in the second mounting space and mounted on the side of the battery frame. The BMS component is electrically connected to the battery module.

[0006] In one embodiment, the phase change sheet includes: The shell has an internal cavity; At least one opening is provided on the surface of the housing and communicates with the cavity; A rubber stopper is placed over the opening to form a sealed cavity; A phase change material is disposed within the sealed cavity.

[0007] In one embodiment, the phase change material is paraffin or a mixture of paraffins.

[0008] In one embodiment, two fixing beams are provided, which are arranged along their own length direction, and the spacing between the two fixing beams is matched with the lower surface of the battery frame.

[0009] In one embodiment, one side of one of the fixed beams is disposed close to the inner wall of the box, and the receiving cavity is divided into two spaces according to the position of the other fixed beam; The space where the two fixed beams are located is the first installation space, and the other space is the second installation space.

[0010] In one embodiment, the phase change plates and cells are alternately arranged to form a battery pack. The battery frame includes side plates and steel strips. The side plates are located on both sides of the battery pack along the cell arrangement direction. The side plates are fixed to the side of the fixing beam facing the box cover by a first connector. The steel strips are wrapped around the outside of the battery pack and the side plates.

[0011] In one embodiment, the BMS component includes a mounting bracket and a circuit board, the circuit board being fixed to the housing by the mounting bracket, with the surface of the circuit board facing the surface of the side panel.

[0012] In one embodiment, the outer edge of the box opening is provided with a first outer folded edge, and the first outer folded edge of the box cover facing the box body is provided with a second outer folded edge. The second outer folded edge is disposed opposite to the first outer folded edge and connected by a second connector.

[0013] In one embodiment, the housing is provided with a connector, through which the BMS component is electrically connected to an external circuit component.

[0014] In addition, to achieve the above objectives, this application also proposes a device including a battery pack with phase change heat dissipation as described above.

[0015] This application directly sandwiches phase change plates between battery cells, utilizing their latent heat of phase change to efficiently absorb battery heat, and combines this with a high thermal conductivity interface layer to enhance heat conduction and improve heat dissipation efficiency. Simultaneously, this application eliminates traditional air ducts or liquid cooling pipes and replaces mechanical isolation structures with phase change plates, achieving a reduction in battery pack volume. This effectively solves the temperature rise problem of batteries in small devices or compact vehicles under high-rate, high-power conditions, ensuring battery power supply stability, extending battery cycle life, and ensuring continuous and reliable equipment operation. Furthermore, a fixed beam partitioned structure is adopted. The first installation space embeds the battery module, and the second installation space utilizes the redundant space in the side panel area of ​​the battery module to embed the BMS component. This overcomes the limitations of increased box height / thickness caused by traditional top-mounted or independently partitioned BMS, minimizing the overall thickness of the battery pack. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an embodiment of the present utility model; Figure 2 This is an exploded view of an embodiment of the present invention; Figure 3 This is a battery module diagram according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a phase change plate structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the phase change sheet installation according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of an embodiment of the present invention.

[0018] Icon labels:

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] This application proposes a phase-change heat dissipation battery pack, such as... Figure 1 and Figure 2 As shown, it includes: a housing 1, which has a receiving cavity and a box opening communicating with the receiving cavity; a box cover 2, which covers the box opening; at least two fixing beams 11, which are disposed in the receiving cavity, and the receiving cavity is divided into a first installation space 12 and a second installation space 13 according to the position of the fixing beams 11; a battery frame, which is disposed in the first installation space 12; multiple battery cells 31, with phase change plates 32 sandwiched between adjacent battery cells 31, the phase change plates 32 and battery cells 31 are alternately disposed in the battery frame, and a heat-conducting layer is filled between adjacent phase change plates 32 and battery cells 31, and the multiple battery cells 31 are electrically connected to each other through conductive components; and a BMS assembly 4, which is disposed in the second installation space 13 and is mounted on the side of the battery frame, and the BMS assembly 4 is electrically connected to the battery module 3.

[0024] More specifically, battery thermal management is crucial for ensuring that batteries operate within a safe and efficient temperature range, directly affecting their performance, lifespan, and equipment reliability. Based on the different heat transfer media, current mainstream battery thermal management technologies are mainly divided into three types: air cooling, liquid cooling, and phase change material (PCM) cooling.

[0025] The core principle of air cooling technology is to use air as a heat transfer medium, removing the heat generated by the battery through forced or natural convection. Its most significant advantage lies in its relatively simple system structure, low implementation cost, and ease of maintenance. However, the limited heat capacity and thermal conductivity of air fundamentally restrict its upper limit of heat dissipation efficiency. When the battery operates under harsh conditions such as high charge state, high-rate charging and discharging, or continuous high-power output, the heat generated inside the battery increases dramatically. Air cooling systems often struggle to provide sufficient heat dissipation capacity, leading to an increased risk of battery temperature runaway. Furthermore, to create effective cooling airflow channels, a large space is typically required within the battery pack, inevitably encroaching on battery placement space and reducing the overall energy density of the battery pack, which is detrimental to improving the device's range. Therefore, air cooling is more suitable for applications with relatively low heat generation power or those with extremely high requirements for cost and structural simplicity.

[0026] Liquid cooling technology uses liquid, which has a much higher thermal conductivity than air, as the cooling medium. By allowing the liquid to directly or indirectly contact the surface or internal channels of the battery module, it efficiently absorbs and transfers heat. This method offers very high heat dissipation efficiency, effectively addressing the heat dissipation needs of high-power-density batteries under extreme operating conditions. However, to achieve liquid circulation, heat exchange, and temperature control, the liquid cooling system requires complex components such as pumps, piping, radiators, storage tanks, and sophisticated temperature control systems. This results in a complex system structure, increased weight, and significantly higher manufacturing costs, along with increased maintenance difficulty and potential leakage risks. These characteristics make liquid cooling systems more suitable for large equipment or vehicles with relatively ample space, extremely high heat dissipation requirements, and the ability to afford higher costs. In contrast, it is often difficult to integrate a complete liquid cooling system into small equipment or vehicles where space and cost are extremely limited.

[0027] Furthermore, phase change material 321 is a technology for thermal management that utilizes the physical property of materials to absorb or release a large amount of latent heat when undergoing a phase transition at a specific temperature. In battery thermal management applications, phase change material 321 is designed to melt near the upper limit of the battery's safe temperature, maintaining battery temperature stability by absorbing the heat generated by the battery. The outstanding advantage of this method lies in its passive operating principle; it requires no additional power components, allowing for a very simple and compact system design with low manufacturing costs. Furthermore, because it has no moving parts, its operational reliability is typically high. It is particularly suitable for solving the heat dissipation problems of batteries in small devices or vehicles operating at high rates and high power, effectively preventing battery overheating, ensuring power supply stability, and extending battery life. To further improve cooling efficiency and cope with a wider range of operating conditions, in practical applications, phase change material 321 cooling is often designed as a hybrid system that can work in conjunction with other cooling methods. For example, under normal operating conditions, the main heat absorption relies on phase change material 321, while at extreme high temperatures or after the phase change material 321 reaches heat storage saturation, auxiliary air-cooling or liquid-cooling systems are activated to enhance heat dissipation, thereby creating a more efficient and reliable thermal management solution.

[0028] To address the aforementioned issues, particularly the challenges of high heat dissipation requirements and limited space in small devices or vehicles where batteries operate at high rates and high power, this application proposes a battery pack solution that integrates phase change material 321 for direct contact heat dissipation.

[0029] Specifically, this application includes a housing 1, a cover 2, a fixing beam 11, multiple battery cells 31, and a BMS assembly 4. The housing 1 serves as a load-bearing frame, ensuring the structural strength and rigidity of the entire battery pack. The cover 2 is connected to the housing 1 via connectors to form a relatively enclosed space. This enclosed space protects the internal components and also provides a controlled environment for the effective operation of the phase change material 321, reducing the interference of external ambient temperature fluctuations on battery temperature management.

[0030] A phase change element 32 is sandwiched between two adjacent individual battery cells 31. When the battery is charged and discharged at high rates or operates at high power, the cells 31 generate heat. This heat is conducted away from the surface of the cells 31. A thermally conductive layer tightly fills the tiny gaps between the surface of the cells 31 and the phase change element 32, greatly reducing contact thermal resistance and ensuring that heat can be efficiently and evenly transferred from the cells 31 to the phase change element 32. The thermally conductive layer is preferably made of thermally conductive adhesive, which has good thermal conductivity, allowing the cells 31 and the phase change element 32 to make full contact. The phase change element 32 absorbs this heat, and its internal special material begins to melt when a specific phase change temperature is reached. This process absorbs a large amount of heat while its own temperature remains almost constant, thus acting as a "thermal buffer" to prevent the temperature of the cells 31 from soaring. When the battery stops working or the load decreases, the temperature drops, the phase change material 321 solidifies, and the stored latent heat is released, preparing for the next heat absorption. Multiple individual battery cells 31 are connected according to design requirements to form a battery module 3 with the required voltage and capacity.

[0031] Utilizing the physical property of phase change material 321 absorbing a large amount of latent heat during phase change at a specific temperature, the phase change sheet 32 ​​absorbs and stores the heat generated by the battery through a melting process before the battery temperature rises to the critical point. This effectively suppresses a sharp rise in battery temperature and maintains it within a safe and efficient operating temperature range. The entire battery pack design emphasizes space utilization efficiency. The phase change sheet 32, as a heat dissipation medium, is directly integrated between the cells 31, eliminating the need for additional liquid cooling pipes, pumps, or large air ducts, thus saving significant space.

[0032] Meanwhile, the internal space is rationally divided by the fixed beams 11, separating the battery module 3 from the battery management system (BMS) to achieve functional zoning and a compact layout. The fixed beams 11 are typically welded or securely connected to the bottom plate of the housing 1, forming a robust framework. They act like partitions, dividing the internal space to ensure spatial separation between the battery module 3 and the sensitive BMS electronic components, reducing physical interference and thermal impact. The beams themselves also serve as important load-bearing components, supporting the weight of the battery module 3 and the inertial forces during operation. The BMS is located on the side of the battery frame, monitoring key parameters of the battery module 3 in real time to protect the battery from damage caused by dangerous conditions such as overcharging, over-discharging, overcurrent, overheating, and short circuits; performing state estimation; managing the charging and discharging process; and providing a communication interface to exchange information with external devices. Installed in a separate secondary space, it serves two purposes: firstly, physical isolation to prevent the heat and potential electrical faults of the battery module 3 from directly affecting sensitive electronic components, improving reliability; secondly, side mounting facilitates electrical connections and maintenance operations.

[0033] This application directly sandwiches the phase change plate 32 between the battery cells 31, utilizing its latent heat of phase change to efficiently absorb battery heat, and combines it with a high thermal conductivity interface layer to enhance heat conduction and improve heat dissipation efficiency. Simultaneously, this application eliminates traditional air ducts or liquid cooling pipes and replaces the mechanical isolation structure with the phase change plate 32, achieving a reduction in battery pack volume. This effectively solves the temperature rise problem of batteries in small devices or compact vehicles under high-rate, high-power conditions, ensuring battery power supply stability, extending battery cycle life, and ensuring continuous and reliable equipment operation. Furthermore, it adopts a fixed beam 11 partitioned structure. The first installation space 12 embeds the battery module 3, and the second installation space 13 utilizes the redundant space in the side plate 34 area of ​​the battery module 3 to embed the BMS component 4. This overcomes the limitations of increased height / thickness of the housing 1 caused by traditional top-mounted or independently partitioned BMS, minimizing the overall thickness of the battery pack.

[0034] In one embodiment, such as Figure 4 As shown, the phase change plate 32 includes: The housing 322 has an internal cavity; at least one opening is provided on the surface of the housing 322 and communicates with the cavity; a rubber plug 323 is provided on the opening to form a sealed cavity; and a phase change material 321 is provided inside the sealed cavity.

[0035] This can be understood as follows: the housing 322 is used to house and protect the internal phase change material 321, and it needs to possess certain mechanical strength, good thermal conductivity, and chemical compatibility with the phase change material 321. The heat generated by the battery is first conducted to the surface of the housing 322, and then conducted through the walls of the housing 322 to the phase change material 321 in the internal cavity. Therefore, the thermal conductivity of the housing 322 material directly affects the heat dissipation efficiency of the entire phase change plate 32. At the same time, the housing 322 also provides a smooth interface for contact with the external thermal conductive layer or the battery cell 31.

[0036] An opening is formed in the surface of the casing 322. During manufacturing, liquid or molten phase change material 321 is poured into the cavity of the casing 322 through this opening, and after the phase change material 321 is filled, it is used to tightly seal the opening on the casing 322. The phase change material 321 has the characteristic of absorbing or releasing a large amount of latent heat at a specific temperature (phase change temperature, usually set near the upper limit of the battery's safe operating temperature) while its own temperature remains almost unchanged. When the adjacent cell 31 operates and generates heat, the heat is transferred to the phase change material 321 through the thermally conductive layer and the casing 322. Once the temperature of the phase change material 321 reaches its phase change point, it begins to change from a solid to a liquid state. This melting process requires the absorption of a large amount of heat, which comes from the cell 31. By absorbing this latent heat, the phase change material 321 effectively prevents the temperature of the cell 31 from rising rapidly, stabilizing its temperature near the phase change point. When the cell 31 stops working or the load decreases, the temperature drops, and the temperature of the phase change material 321 drops below the phase change point, it solidifies back from a liquid state to a solid state, releasing the latent heat absorbed earlier in the process.

[0037] In one embodiment, the phase change material 321 is paraffin or a mixture of paraffins.

[0038] Paraffin wax, or paraffin-based materials, is preferred as the phase change material 321 due to its high latent heat of phase change per unit mass, large specific heat capacity, small volume change during phase change, phase change temperature within the safe operating temperature range of the battery, low toxicity, and low price. Specifically, the casing 322 is made of aluminum, a metal with excellent thermal conductivity. As the casing material 322 for the phase change element 32, aluminum can rapidly and evenly conduct the heat transferred from the surface of the cell 31 through the thermally conductive layer to the entire internal surface of the casing 322, and then efficiently transfer it to the encapsulated paraffin material, minimizing resistance during heat transfer and ensuring timely thermal management response. Aluminum has a low density, which helps to reduce the weight of the phase change element 32 and the entire battery pack.

[0039] The manufacturing process is as follows: First, the surface of the aluminum cavity is anodized to form an insulating oxide film on the surface of the shell 322. Then, paraffin wax or a paraffin wax mixture is poured into the aluminum cavity, and the openings at both ends are sealed with rubber stoppers 323 to form the phase change sheet 32. Because the phase change material 321, such as paraffin wax, undergoes volume expansion and contraction during the solid-liquid phase change process, although the volume change of paraffin wax is relatively small, under long-term, repeated thermal cycling, this volume fluctuation will generate continuous stress on the sealing structure. The rubber stopper 323 has excellent elasticity and can absorb and compensate for the internal pressure fluctuations or vacuum effects caused by the volume change of the phase change material 321 through its own elastic deformation. This flexible sealing method can effectively avoid sealing failure, deformation of the shell 322, or even cracking caused by rigid constraints. Rigid sealing methods (such as welding, brazing, and hard sealing) cannot adapt to this dynamic volume change. Repeated expansion and contraction stress can cause fatigue cracks at the weld or interface, ultimately leading to leakage.

[0040] Therefore, paraffin or paraffin mixtures were chosen as the core filler for the phase change sheet 32 ​​of this application based on its comprehensive advantages, including excellent heat absorption capacity, suitable and adjustable phase change temperature, small phase change volume expansion, good safety and low cost. These advantages make it an ideal thermal management medium for solving the temperature rise problem of batteries, especially small devices / vehicle batteries with limited space, under high power operation.

[0041] In one embodiment, two fixing beams 11 are provided, which are arranged along their own length direction, and the spacing between the two fixing beams 11 is matched with the lower surface of the battery frame.

[0042] This can be understood as follows: two fixed beams 11 are arranged parallel to the long or short side of the housing 1 along their own length. One fixed beam 11 is closely attached to the inner wall of one side of the housing 1, with its length parallel to the wall it is attached to. The other fixed beam 11 is arranged parallel to the first fixed beam 11 at a specific distance inside the housing cavity of the housing 1, according to design requirements. This distance is a key design parameter, and its size is precisely set to match the dimensions of the lower surface of the battery frame to support the battery frame.

[0043] In one embodiment, such as Figure 6 As shown, one side of one of the fixed beams 11 is set close to the inner wall of the box 1, and the receiving cavity is divided into two spaces according to the position of the other fixed beam 11; wherein, the space where the two fixed beams 11 are located is the first installation space 12, and the other space is the second installation space 13.

[0044] In this embodiment, the fixed beam 11, which is closely attached to the box wall, is integrated with the side wall of the box 1 through welding or secure connection. Because it is close to the box wall, its side facing the center of the box 1 naturally becomes a fixed side boundary of the first installation space 12. Its upper surface and inner facade provide a stable mounting reference surface and positioning surface for the corresponding edges of the battery frame, ensuring that the battery frame is accurately positioned and securely fixed within the box 1, and effectively transmits loads.

[0045] The internally installed fixed beam 11 is the decisive factor in dividing the two functional spaces. It is parallel to the first beam and located inside the housing 1. Its two sides form different areas: the space between it and the first fixed beam 11 is defined as the first mounting space 12; the space on the other side, away from the first beam and closer to the inner wall of the housing 1, is defined as the second mounting space 13. The distance between it and the first beam precisely matches the lower surface dimensions of the battery frame, allowing the battery frame to be mounted on these two beams.

[0046] The double fixed beam 11 achieves precise positioning and stable load bearing of battery module 3, physical isolation and independent installation of BMS component 4, clear division and full utilization of internal space of box 1, and significant enhancement of overall structural rigidity.

[0047] In one embodiment, such as Figure 3 and Figure 5 As shown, phase change plates 32 and cells 31 are alternately arranged to form a battery pack. The battery frame includes a side plate 34 and a steel strip 33. The side plate 34 is located on both sides of the battery pack along the arrangement direction of the cells 31. The side plate 34 is fixed to the side of the fixing beam 11 facing the box cover 2 by a first connector. The steel strip 33 is wrapped around the outside of the battery pack and the side plate 34.

[0048] This can be understood as follows: the battery module 3 is composed of alternating layers of battery cells 31 and phase change plates 32, with the main heat-generating surface of each battery cell 31 closely adjacent to a phase change plate 32. When the battery cell 31 generates heat during operation, the heat is directly and efficiently conducted to the phase change plates 32 adjacent to its sides. The phase change material 321 inside the phase change plate 32 absorbs heat and undergoes a phase change, utilizing its high latent heat of phase change to absorb and store a large amount of heat, thereby effectively suppressing the rapid rise in the temperature of the battery cell 31 and maintaining it within a safe and efficient operating temperature range. Two robust side plates 34 are placed vertically on both sides of the battery pack along the stacking direction of the battery cells 31 / phase change plates 32. They constitute the main structural framework and mounting base of the battery module 3. Steel strips 33 are tightly wrapped around the outside of the entire battery pack and the two side plates 34. Two steel strips 33 are provided, one at the top and one at the bottom of the battery module 3, respectively, firmly binding the battery cells 31, phase change plates 32, and the two side plates 34 into a single, rigid battery module. Ensure that the necessary contact pressure is maintained between the battery cell 31 and the phase change plate 32, and between the phase change plate 32 and the housing 322, to optimize heat conduction efficiency.

[0049] The assembled battery module 3 is placed and fixed within the pre-defined first installation space 12 inside the housing 1. As mentioned earlier, two parallel fixing beams 11 are installed inside the housing 1, forming the bottom load-bearing boundary of the first installation space 12. The spacing between these two beams precisely matches the bottom of the battery module 3. The side plate 34 of the battery module 3 is fixed to the upper surface of the fixing beam 11 via a first connector, typically a long bolt. A long screw 6 passes through the side plate 34 and is screwed downwards into a pre-drilled threaded hole or nut on the fixing beam 11, firmly pressing it downwards and fixing it to the fixing beam 11. This prevents the module from jumping, loosening, or detaching in the vertical direction.

[0050] The parallel spacing of the two fixing beams 11 matches the spacing of the side plates 34, which inherently restricts the movement of the module in the direction perpendicular to the beam length (Y-axis). The tightening of the long screws 6 further enhances this constraint. In the beam length direction (X-axis), the frictional force generated by the clamping force of the screws, along with possible locating pins / structures, collectively restricts the movement of the module in this direction. Through this fixing method, the battery module 3 is precisely and securely constrained within the first mounting space 12 formed by the two fixing beams 11, the side wall of the housing 1, and the other side of the internal fixing beams 11.

[0051] In one embodiment, such as Figure 2 As shown, the BMS component 4 includes a mounting bracket and a circuit board. The circuit board is fixed inside the housing 1 by the mounting bracket, and the surface of the circuit board faces the surface of the side panel 34.

[0052] The BMS component 4 can be understood as including a mounting bracket and a circuit board. The mounting bracket's structural design takes into account the shape, size, and fixing point positions of the second mounting space 13 within the housing 1. It typically possesses sufficient rigidity and strength to support the circuit board and electrical components, and can withstand vibrations and shocks during vehicle operation. The circuit board includes a main control circuit board, which is mounted in a dedicated box and fixedly installed at a designated position on the mounting bracket. The BMS component 4 also includes electrical components, which are distributed and fixedly installed at corresponding reserved positions on the mounting bracket according to their functions and signal acquisition requirements. The installation method follows standard electronic equipment installation specifications to ensure stability and reliability. Each electrical component (such as voltage acquisition harness terminals, sensor interfaces, relay control lines, etc.) is connected to the corresponding connection sockets / interfaces on the main control board's box via wires. This constitutes the BMS's signal acquisition network and control execution network.

[0053] The entire BMS component 4 is fixedly installed in the second mounting space 13 inside the enclosure 1. The mounting bracket is securely fixed to the bottom plate of the enclosure 1 or to a pre-set mounting point within the second mounting space 13 via a second connector.

[0054] The surface of the circuit board faces the surface of the side panel 34, meaning that the BMS assembly 4 is mounted inside the housing 1 such that its largest outer surface, typically the side with the interface or heat dissipation surface, is parallel and opposite to the outer surface of the adjacent battery module 3 side panel 34. This parallel arrangement utilizes the elongated shape of the second mounting space 13. Simultaneously, it facilitates airflow or heat dissipation through the walls of the housing 1, preventing localized overheating of the BMS electronic components.

[0055] In one embodiment, such as Figure 1 and Figure 2 As shown, the outer edge of the box opening is provided with a first outer folded edge, and the first outer folded edge of the box cover 2 facing the box body 1 is provided with a second outer folded edge. The second outer folded edge is arranged opposite to the first outer folded edge and connected by a second connector.

[0056] This can be understood as follows: the outer edge of the box opening bends horizontally outward to form a flat, annular first outer fold. Rivet nuts are pre-installed on this first outer fold. These nuts are evenly distributed around the circumference of the fold, serving as the fastening base for the second connector. The edge of the box cover 2 also bends horizontally outward to form a flat, annular second outer fold. The size and shape of the second outer fold match the first outer fold of the box body 1. When the box cover 2 is closed onto the box body 1, the second outer fold of the box cover 2 is vertically parallel to and completely opposite to the first outer fold of the box body 1. Through holes are provided on the second outer fold, corresponding to the positions of each rivet nut on the first outer fold of the box body 1, allowing the second connector to pass through. A silicone pad 5 is sandwiched between the first outer fold of the box body 1 and the second outer fold of the box cover 2.

[0057] In addition, the cover 2 is equipped with a handle 21 for easy handling of the entire battery pack. The cover 2 also integrates a status indicator light 22 to visually display key battery status information.

[0058] In one embodiment, the enclosure 1 is equipped with a connector 14, through which the BMS component 4 is electrically connected to external circuit components. This can be understood as the BMS establishing a safe, sealed, and reliable electrical connection with external circuit components such as the vehicle controller, charging system, high-voltage relays, and instruments through the dedicated connector 14 pre-installed on the wall of the enclosure 1. The installation of the connector 14 on the enclosure 1 adopts industry-standard and mature methods to ensure its mechanical strength, environmental sealing, and electrical safety.

[0059] Furthermore, this application also proposes a device including a phase change heat dissipation battery pack as described above. The phase change heat dissipation battery pack includes: a housing 1 with an opening communicating with a receiving cavity; a housing cover 2 covering the opening; at least two fixing beams 11 disposed within the receiving cavity, the receiving cavity being divided into a first mounting space 12 and a second mounting space 13 according to the positions of the fixing beams 11; a battery frame disposed in the first mounting space 12; multiple battery cells 31, with phase change plates 32 sandwiched between adjacent battery cells 31, the phase change plates 32 and battery cells 31 alternately disposed within the battery frame, a thermally conductive layer filling the space between adjacent phase change plates 32 and battery cells 31, and the multiple battery cells 31 electrically connected through conductive components; and a BMS assembly 4 disposed in the second mounting space 13, and the BMS assembly 4 mounted on the side of the battery frame, the BMS assembly 4 being electrically connected to the battery module 3.

[0060] This application directly sandwiches the phase change plate 32 between the battery cells 31, utilizing its latent heat of phase change to efficiently absorb battery heat, and combines it with a high thermal conductivity interface layer to enhance heat conduction and improve heat dissipation efficiency. Simultaneously, this application eliminates traditional air ducts or liquid cooling pipes and replaces the mechanical isolation structure with the phase change plate 32, achieving a reduction in battery pack volume. This effectively solves the temperature rise problem of batteries in small devices or compact vehicles under high-rate, high-power conditions, ensuring battery power supply stability, extending battery cycle life, and ensuring continuous and reliable equipment operation. Furthermore, it adopts a fixed beam 11 partitioned structure. The first installation space 12 embeds the battery module 3, and the second installation space 13 utilizes the redundant space in the side plate 34 area of ​​the battery module 3 to embed the BMS component 4. This overcomes the limitations of increased height / thickness of the housing 1 caused by traditional top-mounted or independently partitioned BMS, minimizing the overall thickness of the battery pack.

[0061] The above embodiments are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A phase-change heat dissipation battery pack, characterized in that, include: The box body is provided with a receiving cavity and a box opening communicating with the receiving cavity; A lid, covering the opening of the box; At least two fixed beams are disposed within the receiving cavity, and the receiving cavity is divided into a first installation space and a second installation space according to the position of the fixed beams; A battery frame is disposed in the first mounting space; Multiple battery cells are provided, with phase change plates sandwiched between adjacent battery cells. The phase change plates and battery cells are alternately arranged within the battery frame. A thermally conductive layer is filled between adjacent phase change plates and battery cells. The multiple battery cells are electrically connected to each other through conductive components. A BMS component is disposed in the second mounting space and mounted on the side of the battery frame. The BMS component is electrically connected to the battery module.

2. The phase change heat dissipation battery pack as described in claim 1, characterized in that, The phase change plate includes: The shell has an internal cavity; At least one opening is provided on the surface of the housing and communicates with the cavity; A rubber stopper is placed over the opening to form a sealed cavity; A phase change material is disposed within the sealed cavity.

3. The phase-change heat dissipation battery pack as described in claim 2, characterized in that, The phase change material is paraffin or a mixture of paraffins.

4. The phase change heat dissipation battery pack as described in claim 1, characterized in that, Two fixed beams are provided, arranged along their own length, and the spacing between the two fixed beams is matched with the lower surface of the battery frame.

5. The phase-change heat dissipation battery pack as described in claim 4, characterized in that, One side of one of the fixed beams is set close to the inner wall of the box, and the receiving cavity is divided into two spaces according to the position of the other fixed beam; The space where the two fixed beams are located is the first installation space, and the other space is the second installation space.

6. The phase-change heat dissipation battery pack as described in claim 4, characterized in that, The phase change plates and cells are alternately arranged to form a battery pack. The battery frame includes side plates and steel strips. The side plates are located on both sides of the battery pack along the direction of cell arrangement. The side plates are fixed to the side of the fixing beam facing the box cover by a first connector. The steel strips are wrapped around the outside of the battery pack and the side plates.

7. The phase change heat dissipation battery pack as described in claim 6, characterized in that, The BMS component includes a mounting bracket and a circuit board. The circuit board is fixed to the housing by the mounting bracket, and the surface of the circuit board faces the surface of the side panel.

8. The phase change heat dissipation battery pack as described in claim 1, characterized in that, The outer edge of the box opening is provided with a first outer folded edge, and the first outer folded edge of the box cover facing the box body is provided with a second outer folded edge. The second outer folded edge is arranged opposite to the first outer folded edge and connected by a second connector.

9. The phase-change heat dissipation battery pack according to any one of claims 1-8, characterized in that, The enclosure is equipped with a connector, and the BMS component is electrically connected to an external circuit component through the connector.

10. A device, characterized in that, This includes a battery pack with phase change heat dissipation as described in any one of claims 1-9.

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