Heat exchange plate device, battery box and battery pack

Abstract

The application discloses a heat exchange plate device, a battery box and a battery pack. The heat exchange plate device comprises a heat exchange plate body provided with a medium flow channel, and the heat exchange plate body is provided with a pressure relief hole. The pressure relief hole is away from the medium flow channel. One side of the heat exchange plate body facing the single battery is a first side, and the other side of the heat exchange plate body facing away from the single battery is a second side. A heat insulation coating is arranged at least at a target heat insulation area of the second side of the heat exchange plate body. The target heat insulation area at least comprises an area where the distance between the medium flow channel and the pressure relief hole is less than a preset distance. The heat exchange plate body is provided with the heat insulation coating to heat insulation protection of the medium flow channel close to the pressure relief hole. The heat insulation coating can effectively block the high-temperature impact of the thermal runaway gas, provide key protection time for the medium flow channel of the heat exchange plate device, ensure the structural integrity, and avoid the problems of insulation failure, system short circuit and the like caused by the leakage of the heat exchange medium due to the melting of the medium flow channel of the heat exchange plate device caused by the thermal runaway of the single battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a heat exchange plate device, a battery housing, and a battery pack. Background Technology

[0002] During charging and discharging, power batteries generate a significant amount of heat. If the temperature is too high, the chemical reaction rate within the battery accelerates, leading to an increased self-discharge rate, faster capacity decay, and a shortened battery lifespan. Furthermore, excessively high battery temperatures can trigger thermal runaway. Thermal runaway causes a dramatic acceleration of internal chemical reactions, generating large amounts of heat and gas, potentially causing the battery to bulge or even explode.

[0003] To control battery temperature, existing technologies typically incorporate heat exchange plates. These plates effectively dissipate heat generated by the battery, preventing overheating and thus mitigating the risk of thermal runaway, ensuring battery safety. Furthermore, the heat exchange plates can regulate temperature, ensuring the battery operates within a suitable range and reducing the negative impact of high temperatures during charging and discharging on battery performance.

[0004] When the heat exchange plate device is located on the lower side of the individual cell and the explosion-proof valve of the individual cell is located at the bottom of the cell, a pressure relief area needs to be set on the heat exchange plate device to correspond to the position of the explosion-proof valve. The pressure relief area is generally a pressure relief hole opened on the heat exchange plate device.

[0005] To improve the battery stacking ratio, individual cells are densely arranged on the heat exchanger assembly, with close proximity between adjacent cells. The bottom of each cell needs to overlap with the medium flow channel of the heat exchanger assembly to ensure heat exchange between the heat exchange medium and the cell. However, the proximity of the pressure relief holes on the heat exchanger assembly to the medium flow channel means that in the event of thermal runaway from a single cell, the high-temperature runaway gas ejected from the pressure relief holes can melt the walls of the medium flow channel near the holes, causing the heat exchange medium to leak out and resulting in serious problems such as insulation failure and arcing.

[0006] Therefore, how to avoid the melting of the medium flow channel wall due to thermal runaway, and thus prevent insulation failure caused by the outflow of heat exchange medium, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] In view of this, the purpose of this application is to provide a heat exchange plate device to avoid the melting of the medium flow channel wall due to thermal runaway, thereby preventing problems such as insulation failure caused by the outflow of heat exchange medium;

[0008] Another objective of this application is to provide a battery housing and battery pack having the above-mentioned heat exchange plate device.

[0009] To achieve the above objectives, this application provides the following technical solution:

[0010] The first aspect of this application provides a heat exchange plate device, including a heat exchange plate body having a medium flow channel, the heat exchange plate body having a pressure relief hole, the pressure relief hole being configured to correspond to a pressure relief assembly of a single cell.

[0011] The pressure relief hole avoids the medium flow channel. The side of the heat exchange plate body facing the single cell is the first side, and the side facing away from the single cell is the second side.

[0012] At least a heat insulation coating is provided in the target heat insulation area on the second side of the heat exchange plate body, and the target heat insulation area includes at least the area where the medium flow channel is located at a distance less than a preset distance from the pressure relief hole.

[0013] The heat exchange plate device provided in this application is equipped with a pressure relief hole. After thermal runaway of a single cell, the high-temperature thermal runaway gas will be discharged through the pressure relief hole of the heat exchange plate device. The side of the heat exchange plate body facing away from the single cell is provided with a heat insulation coating. The heat insulation coating is provided on the medium flow channel at least within a preset distance from the pressure relief hole to provide heat insulation protection for the medium flow channel closer to the pressure relief hole.

[0014] The thermal insulation coating can effectively block the high-temperature impact of thermal runaway gas, providing critical protection time for the medium flow channel of the heat exchange plate device, ensuring its structural integrity, thereby avoiding the problem of thermal runaway of individual cells causing the medium flow channel of the heat exchange plate device to melt through, resulting in leakage of heat exchange medium, and ultimately leading to insulation failure and system short circuit.

[0015] Furthermore, if the heat exchanger assembly melts through, the entire thermal management system will cease to function effectively. Even if only one individual cell experiences thermal runaway, the resulting massive heat can cause the entire battery pack temperature to spike, exacerbating the risk to other individual cells. Protecting the heat exchanger assembly from damage means that even after thermal runaway occurs, the thermal management system can still be forced to operate, cooling surrounding unaffected cells and buying time for personnel escape and emergency response.

[0016] A second aspect of this application provides a battery housing, including a housing frame and a bottom plate assembly disposed at the bottom of the housing frame, the housing frame and the bottom plate assembly forming a battery compartment for accommodating a battery pack;

[0017] The base plate assembly includes at least a heat exchange plate device, which is a heat exchange plate device as described in any of the preceding claims.

[0018] The battery housing provided in this application has all the technical effects of the aforementioned heat exchange plate device, which will not be elaborated further here.

[0019] A third aspect of this application provides a battery pack, including a battery housing and a battery pack, wherein the battery housing is as described above, and the battery pack is disposed within the battery compartment.

[0020] The battery pack provided in this application has all the technical effects of the aforementioned battery housing, which will not be repeated here. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a partial structural diagram of the front of the battery pack disclosed in an embodiment of this application;

[0023] Figure 2 This is a partial structural diagram of the back of the battery pack disclosed in an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the structure of the base plate and side heat exchange plate disclosed in the embodiments of this application;

[0025] Figure 4 This is a schematic diagram of the heat exchange plate device disclosed in the embodiments of this application;

[0026] Figure 5 This is a bottom view of the heat exchange plate device disclosed in the embodiments of this application;

[0027] Figure 6 This is a top view of the base plate disclosed in the embodiments of this application;

[0028] Figure 7 for Figure 6 Sectional view along AA;

[0029] Figure 8 for Figure 7 A magnified view of part A in the image;

[0030] Figure 9 This is a cross-sectional view of the medium flow channel disclosed in the embodiments of this application.

[0031] The meanings of the various reference numerals in the figure are as follows:

[0032] 100 - Battery housing; 101 - Sub-battery compartment; 102 - Electrical compartment;

[0033] 110 - Box frame;

[0034] 120 - Base plate assembly; 121 - Heat exchange plate device; 1211 - First plate body; 1212 - Second plate body; 1213 - Heat insulation coating; 1214 - Insulating coating; 122 - First thermally conductive structural adhesive layer; 123 - Bottom protective plate; 124 - Pressure relief hole; 125 - Medium flow channel; 126 - Target heat insulation area; 127 - Pressure relief chamber;

[0035] 130 - Side heat exchange plate; 131 - Second thermally conductive adhesive layer;

[0036] 140 - Second partition;

[0037] 150 - First partition;

[0038] 200-cell battery. Detailed Implementation

[0039] This application discloses a heat exchange plate device to avoid melting of the medium flow channel wall due to thermal runaway, thereby preventing insulation failure caused by heat exchange medium outflow.

[0040] This application also discloses a battery box and battery pack having the above-mentioned heat exchange plate device.

[0041] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the application as described in the claims. Additionally, the complete composition represented in the embodiments below is not limited to what is necessary as the solution to the application described in the claims. It should be noted that, for ease of description, only the parts relevant to the application are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0042] like Figure 1 As shown, the casing of the single cell 200 is equipped with a pressure relief component (such as an explosion-proof valve). When a large amount of gas is generated inside the single cell 200 due to abnormal conditions such as overcharging, overheating, or short circuit, causing the internal pressure to rise to a certain level, the pressure generated by the gas will cause the pressure relief component to open. At this time, the high-pressure gas inside the single cell 200 can be discharged, thereby reducing the internal pressure of the battery and preventing serious safety accidents such as explosion or rupture due to excessive internal pressure.

[0043] When a single cell 200 experiences thermal runaway, the high pressure inside the battery ruptures the pressure relief assembly, releasing pressure and preventing the single cell 200 from exploding. However, when the battery's energy density is high, the pressure relief port where the pressure relief assembly is installed may break during thermal runaway of the single cell 200, causing the high-temperature material generated by thermal runaway to be ejected into the battery casing 100.

[0044] During thermal runaway, a single cell 200 will eject a stream of particles reaching temperatures exceeding 1000°C. If the single cell 200 is supported by a heat exchanger assembly, and the pressure relief component of the single cell 200 is located on the side facing the heat exchanger assembly, the thermal runaway gas generated during thermal runaway will directly impact the heat exchanger assembly, potentially melting through the medium flow channels and causing heat exchange medium leakage. The leaked heat exchange medium may cause a large-area short circuit inside the battery pack, triggering arcing and fire, allowing the fault to spread from a single cell 200 to the entire battery pack.

[0045] The heat exchange medium in the heat exchange plate device can be a cold medium to cool the battery pack; it can also be a hot medium to heat the battery pack; or it can be a temperature-controlled medium to adjust the temperature of the battery pack as needed.

[0046] Based on this, such as Figures 1-4 As shown in the illustration, this application discloses a heat exchange plate device 121, which includes a heat exchange plate body with a medium flow channel 125 and a pressure relief hole 124. The pressure relief hole 124 is configured to correspond to the pressure relief assembly of a single cell 200. The pressure relief assembly of the single cell 200 faces downward and is aligned with the pressure relief hole 124 on the heat exchange plate body, providing a pressure relief channel for the enormous energy and ejected material generated during thermal runaway. Thermal runaway gas can quickly pass through the pressure relief hole 124 and through the heat exchange plate device 121, continuing to be discharged downstream, reducing the high-temperature impact on the heat exchange plate device 121.

[0047] The pressure relief hole 124 avoids the medium flow channel 125 to maintain the sealing of the medium flow channel 125 and prevent the heat exchange medium in the medium flow channel 125 from leaking through the pressure relief hole 124. For ease of understanding, the side of the heat exchange plate body facing the single cell 200 is defined as the first side, and the side facing away from the single cell 200 is defined as the second side.

[0048] like Figures 5-9 As shown, a heat insulation coating 1213 is provided at least on the target heat insulation area 126 on the second side of the heat exchange plate body. The heat insulation coating 1213 has a heat insulation effect, which can reduce the high-temperature damage to the heat exchange plate body caused by high-temperature thermal runaway gas. The target heat insulation area 126 includes at least the area where the medium flow channel 125 is located at a distance less than a preset distance from the pressure relief hole 124, so as to provide heat insulation protection for the medium flow channel 125 that is close to the pressure relief hole 124. Since the heat exchange medium will leak if the medium flow channel 125 is melted through, causing a more serious accident, it is necessary to ensure that the outer wall (outer wall on the second side) of the medium flow channel 125 within the preset distance is sprayed with the heat insulation coating 1213.

[0049] Since the temperature is higher in the area closer to the pressure relief hole 124, while the temperature is lower in the area farther away from the pressure relief hole 124, the heat exchange plate body is not able to be melted. Therefore, applying a heat insulation coating 1213 to the medium flow channel 125 within a preset distance can prevent the medium flow channel 125 from being melted through.

[0050] The heat insulation coating 1213 can effectively block the high-temperature impact of thermal runaway gas, providing critical protection time for the medium flow channel 125 of the heat exchange plate device, ensuring its structural integrity, thereby avoiding the problem of thermal runaway of the individual cell 200 causing the medium flow channel 125 of the heat exchange plate device to melt through, resulting in heat exchange medium leakage, and ultimately leading to insulation failure and system short circuit.

[0051] Furthermore, if the heat exchanger assembly melts through, the entire thermal management system will cease to function effectively for cooling. Even if only one individual cell 200 experiences thermal runaway, the resulting massive heat will cause the entire battery pack temperature to spike, exacerbating the risk to other individual cells 200. This implementation, by adding a heat-insulating coating 1213 to protect the heat exchanger assembly from damage, means that even after thermal runaway occurs, the thermal management system can still be forced to operate, cooling the surrounding unaffected individual cells 200 and buying time for personnel escape and emergency response.

[0052] In one specific embodiment of this application, the target heat insulation area 126 includes the region where the medium flow channel 125 is located at a distance of less than 25 mm from the pressure relief hole 124. That is, in this embodiment, the range of the target heat insulation area 126 is controlled within the medium flow channel 125 within a distance of less than 25 mm from the pressure relief hole 124. In other words, in this embodiment, it is necessary to ensure that the heat insulation coating 1213 is applied to the outer wall of the medium flow channel 125. According to experimental verification, this achieves the technical effect of preventing the medium flow channel 125 from being melted through.

[0053] The target heat insulation area 126 is the area to which the heat insulation coating 1213 is applied. In this embodiment, the target heat insulation area 126 is limited to a range of 25 mm around the pressure relief hole 124. This range may only include the area where the medium flow channel 125 is located. The non-medium flow channel area may not belong to the target heat insulation area 126. In other words, the non-medium flow channel area may not be coated with the heat insulation coating 1213.

[0054] It should be noted that the above distance is also related to the material of the heat exchanger plate body. The higher the melting point of the heat exchanger plate body material, the lower the distance can be; conversely, the higher the melting point of the heat exchanger plate body material, the higher the distance can be. Of course, the above distance is also related to the thickness of the heat exchanger plate body. The greater the thickness of the heat exchanger plate body, the lower the distance can be; conversely, the smaller the thickness of the heat exchanger plate body, the higher the distance can be.

[0055] Furthermore, the target heat insulation area 126 is the area where the distance from the pressure relief hole 124 is less than 30mm. That is, in this embodiment, the spraying range of the heat insulation coating 1213 is controlled to be the entire area where the distance from the pressure relief hole 124 is less than 30mm. In other words, in addition to the outer wall of the medium flow channel 125 needing to be sprayed with the heat insulation coating 1213, the non-flow channel area also needs to be sprayed with the heat insulation coating 1213 to improve spraying efficiency.

[0056] In the event of thermal runaway, the pressure relief assembly bursts open, but the path and range of the high-temperature, high-pressure jet are highly uncertain. It may not be a concentrated jet, but rather a complex fluid state characterized by a fan shape or multiple scattered streams. The battery may also rupture at weak points (such as welds) due to internal pressure, rather than just within the pressure relief assembly. If the jet deviates slightly from the intended pressure relief port area, the high-temperature particle stream can directly impact the surface of the liquid heat exchanger plate without the thermal insulation coating 1213, causing it to melt through, leading to coolant leakage and short circuits.

[0057] Therefore, in this embodiment, a heat-insulating coating 1213 is provided in the area corresponding to the second side of the heat exchange plate body of the medium flow channel 125. That is, in this embodiment, the heat-insulating coating 1213 is sprayed onto the entire surface of the second side of the heat exchange plate body of the medium flow channel 125 to provide comprehensive protection for the relatively thin medium flow channel 125.

[0058] Furthermore, the second side of the heat exchange plate body can be fully coated with a heat insulation coating 1213, meaning that the entire second side of the heat exchange plate body is sprayed with the heat insulation coating 1213. No matter where the thermal runaway gas impacts the heat exchange plate body, the uniform heat insulation coating 1213 provides protection, eliminating the risks caused by the uncertainty of the spray path and providing 100% coverage assurance.

[0059] The second side of the entire heat exchange plate is uniformly coated in one go using automated spraying equipment. The process is extremely simple, with good consistency, high production efficiency, and stable and reliable quality, saving the time and cost of using a masking film to cover non-coated areas.

[0060] When a single cell 200 experiences thermal runaway, the large amount of heat it generates is rapidly conducted to the areas of adjacent cells 200 through the contact heat exchange plate body, heating the adjacent cells 200 and potentially triggering a chain reaction. The heat-insulating coating 1213 on the second side of the heat exchange plate body significantly increases the thermal resistance of heat conduction along the heat exchange plate body. This effectively slows down the rate at which heat is transferred to adjacent cells 200, providing the battery management system with more reaction time for response measures (such as cutting off circuits or initiating strong cooling), and greatly increasing the likelihood of preventing heat propagation.

[0061] The heat-insulating coating 1213 also typically possesses good wear resistance and corrosion resistance. Spraying this coating onto the entire surface of the second side of the heat exchanger body is equivalent to providing a protective film for the second side of the heat exchanger body, making it more scratch-resistant during assembly, use, and maintenance, and resisting long-term chemical corrosion that may occur from the heat exchanger assembly, thus extending the overall battery pack lifespan.

[0062] In this embodiment, the heat insulation coating 1213 can be an epoxy resin coating or an epoxy-modified silicone resin coating. This embodiment does not limit the material of the heat insulation coating 1213, as long as it has heat insulation function.

[0063] The thickness of the heat insulation coating 1213 is 100um to 500um. For example, the thickness of the heat insulation coating 1213 can be 100um, 120um, 150um, 170um, 200um, 220um, 250um, 300um, 330um, 380um, 400um, 450um, 470um, 500um, etc. In this embodiment, the thickness of the heat insulation coating 1213 is not limited, as long as it can achieve the heat insulation effect and prevent the medium flow channel 125 from being melted through.

[0064] In a battery pack, one electrode of a single cell 200 is typically connected to the battery casing (e.g., a lithium iron phosphate battery). The heat exchange plate assembly 121 is typically made of a metal (such as aluminum), which is a good conductor. If the battery casing is in direct contact with the heat exchange plate assembly 121, and the insulation layer of the battery casing (such as the blue film) is damaged, a short circuit can occur, causing the positive or negative electrode of the battery to form a circuit with the entire battery casing through the heat exchange plate assembly 121.

[0065] Therefore, in a specific embodiment of this application, an insulating coating 1214 is provided on the first side of the heat exchange plate body. The insulating coating 1214 establishes an insulating barrier between the individual battery 200 and the conductive heat exchange plate device 121, eliminating the aforementioned short-circuit risk.

[0066] The insulating coating 1214 can be made very thin and uniform, while also possessing good thermal conductivity. Compared to insulating sheets that require a certain thickness to ensure mechanical strength, the coating can form a thinner and more uniform thermal interface layer, thereby reducing the contact thermal resistance between the individual cell 200 and the heat exchange plate device 121, improving heat dissipation efficiency, and resulting in lower temperatures, better performance, and longer lifespan for the individual cell 200 under high load operation.

[0067] The insulating coating 1214 (such as an epoxy resin coating or a ceramic coating) not only provides insulation but also isolates the metal substrate of the heat exchange plate device 121 from the external environment, preventing it from being oxidized or corroded. At the same time, the insulating coating 1214 is more wear-resistant than soft metals such as aluminum, and can protect the first side surface of the heat exchange plate device 121 from scratches during repeated installation, disassembly, or slight vibration and friction of the single cell 200.

[0068] Because the insulating coating 1214 is thin, it takes up almost no extra space, making the entire battery pack structure more compact. This makes it possible to accommodate more individual cells 200 or reinforcing structural components in a limited space, thereby indirectly helping to improve the volumetric energy density of the battery pack.

[0069] like Figure 8 and Figure 9 As shown, the heat exchange plate body includes a first plate 1211 and a second plate 1212 stacked together. The second plate 1212 has flow channel grooves extending away from the first plate 1211. The first plate 1211 can be a planar plate, or a corresponding structure can be designed according to requirements, and is not limited to a planar structure. The flow channel grooves can be formed only in the second plate 1212 by stamping to ensure the flatness of the first plate 1211, so as to facilitate the support of the single cell 200.

[0070] A medium flow channel 125 is formed between the first plate 1211 and the flow channel groove. The heat exchange medium flows within the medium flow channel 125 to exchange heat with the first plate 1211 and the second plate 1212, carrying away the heat from the individual battery 200. The heat exchange medium can be water or heat transfer oil. This embodiment does not limit the material of the heat exchange medium.

[0071] The first plate 1211 is located on the first side of the heat exchange plate body to support the single cell 200, and the second plate 1212 is located on the second side of the heat exchange plate body to prevent the cavity structure (i.e. the structure forming the flow channel groove) on the second plate 1212 from occupying the internal space of the pack.

[0072] like Figure 1 and Figure 2 As shown in the embodiments, this application also discloses a battery housing 100, which includes a housing frame 110 and a bottom plate assembly 120 disposed at the bottom of the housing frame 110. The housing frame 110 and the bottom plate assembly 120 form a battery compartment for accommodating a battery pack. Each individual battery cell 200 of the battery pack is installed in the battery compartment. The bottom plate assembly 120 includes at least a heat exchange plate device 121, which is the heat exchange plate device 121 disclosed in the above embodiments.

[0073] The battery housing 100 disclosed in this application has the above-mentioned heat exchange plate device 121, and therefore has all the technical effects of the heat exchange plate device 121, which will not be repeated here.

[0074] The battery housing 100 is typically a closed or semi-closed structure made of materials such as metal and plastic. It is the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack in different usage scenarios.

[0075] The battery enclosure provides installation space for the battery pack, BMS (Battery Management System), electrical connection components, etc., and through reasonable structural design, it fixes these components in the battery enclosure to ensure that they maintain a relatively stable position during battery pack operation, and avoid damage to components or loosening of connections due to vibration, impact and other factors.

[0076] A battery enclosure generally includes a enclosure body and a battery cover. The enclosure body generally includes a base plate assembly 120 and an enclosure frame 110 connected to and surrounding the base plate assembly 120. The battery cover is connected to the enclosure frame 110, and the battery cover is positioned opposite to the base plate assembly. The battery cover and the enclosure body together enclose a receiving chamber.

[0077] The battery casing can be cast from materials such as steel plates and aluminum alloys, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials. The shape of the battery casing can be cylindrical, cuboid, cube, etc.

[0078] like Figure 7 and Figure 8 As shown in a specific embodiment of this application, the base plate assembly 120 may further include a bottom protective plate 123, which is fixed to the side of the heat exchange plate device 121 away from the single cell 200 and forms a pressure relief cavity 127 between it and the heat exchange plate device 121.

[0079] Thermal runaway gases can rapidly accumulate pressure within the battery pack. Without a pre-designed pressure relief path, the battery pack could explode at its weakest point. The pressure relief chamber 127 is connected to a pre-installed pressure relief valve on the outside of the battery pack. This allows the thermal runaway gases to bypass critical and vulnerable components within the battery pack, such as high-voltage wiring harnesses, control modules, and other individual battery cells 200, preventing flames and high-temperature gases from rampaging through the pack and causing the failure to escalate. The thermal runaway gases are directed out of the vehicle (usually downwards or in a specific direction) rather than into the passenger compartment.

[0080] The presence of the pressure relief chamber 127 provides a brief expansion and buffer space for the thermal runaway gas, which can smooth the pressure curve and avoid excessive impact on the pressure relief valve and bottom protection plate 123 on the final battery box, ensuring that the pressure relief process is controllable and orderly.

[0081] The single-cell battery 200 ejects not only gas, but also high-temperature solid particles and molten material. If these substances were directly discharged, they could still pose a risk of igniting external objects. When these substances enter the pressure relief chamber 127, they collide with and exchange heat with the relatively cool chamber walls (the lower side of the heat exchange plate device 121 and the bottom protective plate 123), thus lowering their temperature. The structure of the pressure relief chamber 127 can alter the airflow direction, dissipating the kinetic energy of the ejected material and allowing it to be discharged from the battery pack in a safer manner.

[0082] This application also discloses a battery pack, which includes a battery housing 100 and a battery pack. The battery housing 100 is the same as the one disclosed in the above embodiments, and the battery pack is disposed within the battery compartment. Since it has the aforementioned battery housing 100, it possesses all the technical effects of the aforementioned battery housing 100, which will not be repeated here.

[0083] In one specific embodiment of this application, the battery housing 100 includes a battery compartment and an electrical compartment 102 separated by a first partition 150. The electrical compartment 102 houses a battery management system. The core function of the battery compartment is to provide installation space for the battery packs. The electrical compartment 102 is where the various battery packs within the battery compartment are connected in series and parallel. Through the connection arrangement of busbars within the electrical compartment 102, different battery packs can be connected according to design requirements to form a circuit system that meets the vehicle's power needs, while simultaneously controlling and managing the battery charging and discharging process.

[0084] The battery compartment and the electrical compartment 102 are separated by a first partition 150, which can be made of the same material as the battery housing 100. A second partition 140 is provided inside the battery compartment, which divides the battery compartment into at least two sub-battery compartments 101.

[0085] The first partition 150 and the second partition 140 can be designed to be perpendicular, or they can be arranged at other angles. The first partition 150 and the second partition 140 can be glued to the inside of the battery box body, or they can be welded to the inside of the battery box body. The electrical compartment 102 is a compartment in the battery box body used to house electrical components, such as BMS and BDU (Battery Disconnect Unit). The first partition 150 and the second partition 140 can be the horizontal and vertical beams inside the battery box body, which serve to separate and enhance the strength of the battery box body. The material can be high-temperature resistant materials such as aluminum alloy, stainless steel, or iron.

[0086] It should be noted that the number of second separators 140 is not limited to one. Those skilled in the art will understand that the number of second separators 140 can be designed based on the number of sub-battery compartments 101. One second separator 140 can divide the battery compartment into two sub-battery compartments 101, while two parallel and spaced-apart second separators 140 can divide the battery compartment into three sub-battery compartments 101. Of course, those skilled in the art can select the specific number of second separators 140 according to design requirements.

[0087] Multiple sub-battery compartments 101 can each hold multiple battery packs, ensuring that the battery packs operate in a relatively stable and safe environment. Each sub-battery compartment 101 is separated from the electrical compartment 102 by a first partition 150.

[0088] Even with precision machining, the surfaces of the battery casing and the heat exchange plate device 121 are microscopically uneven. When in direct contact, there are only a few points of contact, and the middle is filled with air with extremely poor thermal conductivity, resulting in very high thermal resistance.

[0089] like Figure 3 As shown, in this embodiment, a first thermally conductive structural adhesive layer 122 is provided between the individual battery 200 and the heat exchange plate device 121. The first thermally conductive structural adhesive layer 122 needs to avoid the pressure relief hole 124 to prevent clogging of the pressure relief hole 124 and affecting the pressure relief after thermal runaway. In this embodiment, the first thermally conductive structural adhesive layer 122 provided between the individual battery 200 and the heat exchange plate device 121 can completely fill these gaps, expel air, and change point contact into surface contact.

[0090] This configuration establishes an efficient heat transfer path to the heat exchange plate device 121 for the heat generated by the single battery 200 during operation, significantly reducing the interface thermal resistance and greatly improving the heat dissipation performance of the single battery 200. This ensures that the single battery 200 operates within the optimal temperature range, extends its lifespan, and improves fast charging performance.

[0091] The first thermally conductive adhesive layer 122 can also bond the individual battery cells 200 to the heat exchange plate device 121, improving the battery pack's resistance to vibration and impact. The bonding of the first thermally conductive adhesive layer 122 is a surface contact, which can more evenly distribute the stress generated by the expansion and contraction of the individual battery cells 200 during charging and discharging, avoiding local stress concentration.

[0092] In one specific embodiment of this application, the battery pack may further include a side heat exchange plate 130, and the battery pack includes multiple rows of battery columns arranged along a first direction, each battery column including multiple individual cells 200 arranged along a second direction, the first direction being perpendicular to the second direction. The side heat exchange plate 130 is disposed between two battery columns and is used to cool the sides of the individual cells 200.

[0093] The addition of the side heat exchange plate 130 in this embodiment improves the heat dissipation efficiency of the individual battery 200, which is crucial for high-rate fast charging / discharging scenarios, as the individual battery 200 generates a large amount of heat at this time, requiring extremely strong cooling capabilities to suppress temperature rise. The combined cooling method of the side heat exchange plate 130 and the bottom heat exchange plate device 121 enables the system to cope with higher thermal loads.

[0094] The side heat exchange plate 130 can clamp the individual battery 200 from the side, providing three-dimensional, surround cooling to the individual battery 200, allowing heat to be carried away from multiple directions. This greatly improves the temperature uniformity inside the individual battery 200, enabling the individual battery 200 to operate in a more balanced state, thereby significantly extending the overall lifespan of the battery system.

[0095] Furthermore, the individual cell 200 is a prismatic cell, and the side heat exchange plate 130 is attached to the small side surface of the individual cell 200; the small side surface is the smaller surface area on the side of the individual cell 200. This arrangement is more conducive to the spatial arrangement of the individual cell 200 within the battery housing 100, and reduces the amount of side heat exchange plate 130 used while meeting cooling requirements.

[0096] Based on the same distance mentioned above, even after precision machining, the surface of the battery casing and the side heat exchange plate 130 is microscopically uneven. When in direct contact, there are only a few points of contact, and the middle is filled with air with extremely poor thermal conductivity, resulting in very high thermal resistance.

[0097] Therefore, in this embodiment, a second thermally conductive structural adhesive layer 131 is provided between the individual battery cell 200 and the side heat exchange plate 130. In this embodiment, the second thermally conductive structural adhesive layer 131 provided between the individual battery cell 200 and the side heat exchange plate 130 can completely fill these gaps, expel air, and change point contact into surface contact. This allows the heat generated on the side of the battery to be transferred to the side heat exchange plate 130 without obstruction, improving the side cooling efficiency.

[0098] The second thermally conductive adhesive layer 131 can compensate for the manufacturing and assembly tolerances between the individual cell 200 and the side heat exchange plate 130, ensuring that each cell side has a uniform and consistent thermal interface with the side heat exchange plate 130. This helps maintain the temperature uniformity of the entire battery pack, ensures that all individual cells 200 degrade evenly, and extends the overall lifespan of the battery pack.

[0099] During charge-discharge cycles, the individual battery cell 200 expands and contracts. The adhesion formed by the second thermally conductive adhesive layer 131 can uniformly disperse and constrain this expansion stress, preventing excessive mechanical deformation of the individual battery cell 200 and improving cycle life.

[0100] The second thermally conductive adhesive layer 131 has a certain degree of elasticity, which can absorb and buffer the mechanical vibration generated during vehicle operation, preventing damage to the battery casing and the side heat exchange plate 130 due to long-term fretting friction. The second thermally conductive adhesive layer 131 itself is an electrical insulator, adding a reliable insulating barrier between the battery casing and the side heat exchange plate 130 to prevent potential short circuits.

[0101] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0102] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0103] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0104] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A heat exchange plate device, characterized in that, It includes a heat exchange plate body having a medium flow channel (125), the heat exchange plate body having a pressure relief hole (124), the pressure relief hole (124) being configured to correspond to the pressure relief assembly of a single cell; The pressure relief hole (124) avoids the medium flow channel (125). The side of the heat exchange plate body facing the single cell (200) is the first side, and the side facing away from the single cell (200) is the second side. At least a heat insulation coating (1213) is provided in the target heat insulation area (126) on the second side of the heat exchange plate body. The target heat insulation area (126) includes at least the area where the medium flow channel (125) is located at a distance less than a preset distance from the pressure relief hole (124).

2. The heat exchange plate device as described in claim 1, characterized in that, The target heat insulation area (126) includes the area where the medium flow channel (125) is located at a distance of less than 25 mm from the pressure relief hole (124).

3. The heat exchange plate device as described in claim 1, characterized in that, The target heat insulation area (126) is the area that is less than 30 mm away from the pressure relief hole (124).

4. The heat exchange plate device as described in claim 1, characterized in that, The heat insulation coating (1213) is provided in the area corresponding to the second side of the heat exchange plate body in the medium flow channel (125).

5. The heat exchange plate device as described in claim 1, characterized in that, The heat exchange plate body is fully coated with the heat insulation coating (1213) on the second side.

6. The heat exchange plate device according to any one of claims 1-5, characterized in that, The heat insulation coating (1213) is an epoxy resin coating or an epoxy-modified silicone resin coating.

7. The heat exchange plate device according to any one of claims 1-5, characterized in that, The thickness of the heat insulation coating (1213) is 100um~500um.

8. The heat exchange plate device according to any one of claims 1-5, characterized in that, The first side of the heat exchange plate body is provided with an insulating coating (1214).

9. The heat exchange plate device according to any one of claims 1-5, characterized in that, The heat exchange plate body includes a first plate (1211) and a second plate (1212) arranged in layers. The second plate (1212) has a flow channel groove extending away from the first plate (1211). The medium flow channel (125) is formed between the first plate (1211) and the flow channel groove. The first plate (1211) is located on the first side of the heat exchange plate body, and the second plate (1212) is located on the second side of the heat exchange plate body.

10. A battery housing, characterized in that, Includes a housing frame (110) and a bottom plate assembly (120) disposed at the bottom of the housing frame (110), the housing frame (110) and the bottom plate assembly (120) forming a battery compartment for accommodating a battery pack; The base plate assembly (120) includes at least a heat exchange plate device (121), which is the heat exchange plate device (121) as described in any one of claims 1-9.

11. The battery housing as described in claim 10, characterized in that, The base plate assembly (120) also includes a bottom guard plate (123), which is fixed to the side of the heat exchange plate device (121) away from the single cell (200) and forms a pressure relief chamber (127) between the bottom guard plate assembly (121) and the heat exchange plate device (121).

12. A battery pack, characterized in that, It includes a battery housing (100) and a battery pack, wherein the battery housing (100) is the battery housing (100) as described in claim 10 or 11, and the battery pack is disposed within the battery compartment.

13. The battery pack as claimed in claim 12, characterized in that, The battery housing (100) includes a battery compartment and an electrical compartment (102) separated by a first partition (150), and the electrical compartment (102) is equipped with a battery management system. The battery compartment is provided with a second partition (140), which divides the battery compartment into at least two sub-battery compartments (101).

14. The battery pack as claimed in claim 12, characterized in that, The battery pack includes multiple individual cells (200), and a first thermally conductive structural adhesive layer (122) is provided between the individual cells (200) and the heat exchange plate device (121), the first thermally conductive structural adhesive layer (122) avoiding the pressure relief hole (124).

15. The battery pack as claimed in claim 12, characterized in that, It also includes a side heat exchange plate (130), the battery pack includes multiple rows of battery columns arranged along a first direction, the battery columns include multiple individual cells (200) arranged along a second direction, the first direction being perpendicular to the second direction; The side heat exchange plate (130) is disposed between the two battery rows.

16. The battery pack as claimed in claim 15, characterized in that, The single cell (200) is a square-shell cell, and the side heat exchange plate (130) is attached to the side surface of the single cell (200). The side facet is the smaller surface area on the side of the single cell (200).

17. The battery pack as claimed in claim 15, characterized in that, A second thermally conductive adhesive layer (131) is provided between the single cell (200) and the side heat exchange plate (130).

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