Battery pack and electric equipment

Abstract

The invention relates to a battery pack and electric equipment, and relates to the technical field of new energy. The battery pack comprises a shell provided with a containing cavity, and the shell comprises a bottom protection plate; a battery module including at least one battery pack including a plurality of batteries; the cooling assembly comprises a cold plate, the cold plate is arranged on the bottom protection plate and is in heat conduction contact with the bottom end of the battery module, a cooling flow channel is formed in the cold plate, the cold plate is embedded in the groove, and at least part of the inner surface of the bottom protection plate is flush with the upper surface of the cold plate; the heat dissipation pad is arranged between two adjacent batteries, the heat dissipation pad is at least in heat conduction contact with the batteries on the two sides, and the heat dissipation pad is configured to conduct heat when the temperature of the batteries is lower than a preset temperature and insulate heat when the temperature of the batteries is higher than the preset temperature. According to the battery pack and the electric equipment, the adjacent batteries are separated through the heat dissipation pads, when one battery abnormally heats, local temperature triggers phase change of the heat dissipation pads, heat is prevented from being transmitted to the adjacent batteries, and heat management of the battery pack is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy, in particular to a battery pack and an electric device. BACKGROUND

[0002] With the continuous development of new energy vehicles, the design of directly integrating battery cells into the vehicle body structure to form an integrated structure (CTB architecture) of the battery pack and the vehicle body has gradually been popularized, which can improve the volume utilization and energy density of the battery pack.

[0003] However, in some high-performance scenarios, such as high-temperature heat damage scenarios, the heat exchange performance of the battery is poor, which will limit the improvement of fast charging and discharge rate, and is easy to cause overheat of a single battery cell, and even trigger a chain reaction of the entire battery pack, which has a high thermal safety risk. SUMMARY

[0004] The present application provides a battery pack and an electric device, adjacent battery sides are separated by a heat dissipation pad, the heat dissipation pad maintains a high thermal conductivity state during normal charging and discharging, which promotes the uniform distribution of heat between the batteries, and when a certain battery abnormally heats, the local temperature triggers the phase change of the heat dissipation pad, blocking the heat transfer to the adjacent battery, thereby optimizing the thermal management of the battery pack.

[0005] In a first aspect, the present application provides a battery pack, comprising:

[0006] A shell is provided with a receiving cavity, the shell includes a bottom guard plate, and an inner surface of the bottom guard plate is provided with a groove;

[0007] A battery module includes at least one battery pack, and the battery pack includes a plurality of batteries arranged side by side;

[0008] A cooling assembly includes:

[0009] A cold plate is provided on the bottom guard plate and is in thermal contact with the bottom end of the battery module, the cold plate forms a cooling flow channel for circulating cooling liquid, the cold plate is embedded in the groove, and at least part of the inner surface of the bottom guard plate is flush with the upper surface of the cold plate;

[0010] A heat dissipation pad is provided between two adjacent batteries, the heat dissipation pad is in thermal contact with the batteries on both sides, and the heat dissipation pad is configured to conduct heat when the temperature of the battery is lower than a preset temperature and to insulate heat when the temperature of the battery is higher than the preset temperature.

[0011] In one possible implementation, the heat dissipation pad includes an encapsulation layer and a thermal insulation layer, the encapsulation layer is wrapped on the outer side of the thermal insulation layer, and the encapsulation layer is configured to melt when the temperature of the battery is higher than the preset temperature.

[0012] In a possible implementation, the thermal insulation layer comprises silica gel, foam or aerogel; and / or, the thickness of the heat dissipation pad is 1mm-3mm.

[0013] In a possible implementation, the preset temperature is 110℃-150℃.

[0014] In a possible implementation, the cold plate comprises:

[0015] a flow channel body, an inside of the flow channel body is formed with at least one cooling flow channel, the cooling flow channel has a liquid inlet and a liquid outlet;

[0016] an interface pipe, comprising a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is in communication with the liquid inlet, the liquid outlet pipe is in communication with the liquid outlet, the flow channel body is in circulation communication with an external liquid supply device through the liquid inlet pipe and the liquid outlet pipe.

[0017] In a possible implementation, the flow channel body comprises: a plurality of sub-flow channel bodies, each of the sub-flow channel bodies is provided with a cooling flow channel, and the extension direction of the sub-flow channel body is parallel to the extension direction of the cooling flow channel.

[0018] The cold plate further comprises:

[0019] a liquid distribution body, connected with the liquid inlets of the plurality of cooling flow channels respectively, and the liquid inlet pipe is arranged on the liquid distribution body.

[0020] a liquid collection body, connected with the liquid outlets of the plurality of cooling flow channels respectively, and the liquid outlet pipe is arranged on the liquid collection body.

[0021] In a possible implementation, the upper surface of the cold plate is flush with the inner surface of the bottom guard plate except the part of the inner surface of the bottom guard plate in the groove, and the cold plate and the bottom guard plate are adapted to carry a battery module.

[0022] In a possible implementation, the bottom guard plate comprises:

[0023] a base body;

[0024] a heat conduction layer, arranged on a side of the base body facing the accommodating cavity.

[0025] In a possible implementation, the base body is a piece of heat-conductive high polymer material; and / or, the heat conduction layer is a metal layer.

[0026] In a second aspect, the embodiments of the present application further provide a power consuming device, comprising the battery pack described above.

[0027] The battery pack and the electric equipment provided by the embodiment of the application, when the cooling liquid flows in the cooling flow channel, the cold plate is in heat-conducting contact with the bottom end of the battery module to realize efficient heat exchange, in addition, the inner surface of the bottom guard plate is provided with a groove to embed the cold plate, the overall structural stability and the optimization of space utilization are improved, the lightweight of the battery pack is improved, the adjacent battery sides are separated by the heat dissipation pad, the heat dissipation pad maintains a high heat conduction state during normal charging and discharging, the heat is evenly distributed between the batteries, when a certain battery abnormally heats, the local temperature triggers the phase change of the heat dissipation pad, the heat is blocked from being transmitted to the adjacent battery, the heat diffusion is avoided to trigger a chain reaction, the heat exchange efficiency of the battery is improved while the heat spread is blocked, the compactness of the battery pack structure is realized, and the thermal management of the battery pack is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A structural schematic diagram of the battery pack provided by the application is provided.

[0029] Figure 2 A sectional view of the heat dissipation pad is provided. Figure 1

[0030] Figure 3 An assembly schematic diagram of the cold plate provided by the application is provided.

[0031] Figure 4 A structural schematic diagram of the cooling assembly provided by the application is provided.

[0032] BRIEF DESCRIPTION OF DRAWINGS:

[0033] 100 - shell; 101 - containing cavity; 110 - bottom guard plate; 1101 - groove; 111 - base body; 112 - heat-conducting layer; 120 - surrounding plate; 130 - cover plate;

[0034] 200 - battery module; 210 - battery pack; 211 - battery;

[0035] 300 - cooling assembly; 310 - cold plate; 3101 - cooling flow channel; 311 - flow channel body; 3111 - sub-flow channel body; 312 - interface pipe; 3121 - liquid inlet pipe; 3122 - liquid outlet pipe; 313 - liquid distribution body; 314 - liquid collecting body;

[0036] 320 - heat dissipation pad; 321 - encapsulation layer; 322 - heat insulation layer;

[0037] 400 - adhesive layer.

[0038] Through the above drawings, the specific embodiments of the application have been shown, and more detailed descriptions will be given hereinafter. The drawings and the textual description are not intended to limit the scope of the concept of the application by any means, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION ​

[0039] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements throughout the description. The following exemplary embodiments are not representative of all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0040] With the continuous development of new energy vehicles, the design of directly integrating the battery cell into the vehicle body structure to form an integrated structure (CTB architecture) of the battery pack and the vehicle body has been gradually popularized, which can improve the volume utilization and energy density of the battery pack.

[0041] However, in some high-performance scenarios, such as high-temperature heat damage scenarios, the heat exchange performance of the battery is poor, which will limit the improvement of fast charging and discharge rate, and is easy to cause overheat of a single battery cell, and even trigger a chain reaction of the entire battery pack, which has a high thermal safety risk.

[0042] To solve the above problems, the battery pack and the power utilization equipment provided by the embodiments of the present application are provided. When the cooling liquid flows in the cooling flow channel, the cold plate is in thermal contact with the bottom end of the battery module to realize efficient heat exchange. In addition, the inner surface of the bottom guard plate is provided with a groove to embed the cold plate, which improves the overall structural stability and optimization of space utilization, improves the lightweight of the battery pack, and the adjacent battery sides are separated by the heat dissipation pad. The heat dissipation pad maintains a high thermal conductivity state during normal charging and discharging, which promotes the uniform distribution of heat between the batteries. When a certain battery abnormally heats up, the local temperature triggers the phase change of the heat dissipation pad, which blocks the heat transfer to the adjacent battery, avoids the chain reaction caused by heat diffusion, improves the heat exchange efficiency of the battery, and realizes the heat spread blocking, realizes the compactness of the battery pack structure, and optimizes the thermal management of the battery pack.

[0043] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0044] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. Figures 1 to 4 The embodiments of the present application are described.

[0045] Reference is made to Figure 1 and Figure 3As shown, the battery pack provided by the embodiments of the present application includes a shell 100, a battery module 200, and a cooling assembly 300. The shell 100 is provided with a receiving cavity 101, and the shell 100 includes a bottom guard plate 110. An inner surface of the bottom plate 110 is provided with a groove 1101. The battery module 200 includes at least one battery pack 210, and the battery pack 210 includes a plurality of batteries 211 arranged side by side. The cooling assembly 300 includes a cold plate 310, which is arranged on the bottom guard plate 110 and is in heat-conducting contact with a bottom end of the battery module 200. The cold plate 310 is internally formed with a cooling flow channel 3101 for circulating cooling liquid. The cold plate 310 is embedded in the groove 1101, and at least a part of the inner surface of the bottom guard plate 110 is flush with an upper surface of the cold plate 310. A heat dissipation pad 320 is arranged between two adjacent batteries 211, and the heat dissipation pad 320 is in heat-conducting contact with the two batteries 211 on both sides, respectively. The heat dissipation pad 320 is configured to conduct heat when the temperature of the battery 211 is lower than a preset temperature and to insulate heat when the temperature of the battery 211 is higher than the preset temperature.

[0046] The cold plate 310 is a heat exchange component integrated with the bottom guard plate 110 and can be manufactured by an aluminum alloy extrusion forming process. The cold plate 310 is internally formed with a serpentine or branched flow channel, and the heat of the battery 211 is absorbed by circulating cooling medium in the flow channel. Optionally, the cold plate 310 can be made of transparent material to facilitate intuitive observation of the flow state of the cooling liquid in the cooling flow channel 3101. Figure 1 The bottom guard plate 110 serves as a bearing structure to support the cold plate 310, and the upper surface of the cold plate 310 is in direct contact with the bottom surface of the battery module 200 to form a continuous heat-conducting surface.

[0047] The inner surface of the bottom guard plate 110 is provided with the groove 1101, that is, the side of the bottom guard plate 110 facing the battery module 200 is formed with a recessed structure, which can be realized by stamping forming or casting process and can be used to position the cold plate 310 and limit the displacement of the cold plate 310, while maintaining the contact area between the cold plate 310 and the bottom guard plate 110. The cold plate 310 is embedded in the groove 1101, which can be realized by welding, bonding or mechanical clamping process. The cold plate 310 and the bottom guard plate 110 form an integrated structure through the embedding mode, avoiding the generation of gaps between the cold plate 310 and the bottom guard plate 110 to affect the heat conduction efficiency.

[0048] At least a part of the inner surface of the bottom guard plate 110 is flush with the upper surface of the cold plate 310, so that the bottom of the battery module 200 can contact the surface of the cold plate 310 and the at least part of the inner surface of the bottom guard plate 110, thereby ensuring the continuity of the heat conduction path and the stability of the support. In addition, in some examples, the groove 1101 can be understood as a hollow design of the bottom guard plate 110. The cold plate 310 is accommodated in the groove 1101, which improves the compactness of the battery pack as a whole, reduces the material for manufacturing, and improves the lightweight of the battery pack and the electric equipment.

[0049] It can be understood that in some prior art, the cold plate 310 or the cold tube is directly fixed on the inner wall of the bottom of the shell 100. Although this design can achieve the basic cooling function, it has some defects.

[0050] On the one hand, since the bottom wall of the shell 100 is flat, the direct fixation of the cold plate 310 or the cold tube on it will form a protruding structure. When the battery module 200 is placed in the accommodating cavity 101, the weight of the battery module 200 is mainly concentrated on the protruding part of the cold plate 310 or the cold tube, resulting in uneven stress. Long-term use will not only cause the connection between the cold plate 310 or the cold tube and the shell 100 to loosen and deform due to stress concentration, affecting the stability of the cooling system, but also may cause local extrusion to the battery module 200, reducing the service life and safety of the battery module 200.

[0051] On the other hand, this fixed way makes the cold plate 310, the battery module 200 and the shell 100 lack effective space integration design, and the integration degree is not high, which cannot achieve the lightweight goal, increases the self-weight of the vehicle and other electrical equipment, and thus consumes more energy and reduces the endurance capability.

[0052] In the present design, the inner surface of the bottom guard plate 110 is provided with a groove 1101 for embedding the cold plate 310, which improves the overall structural stability and optimizes the space utilization. The groove 1101 plays a positioning role for the cold plate 310, limiting its displacement during the working process of the battery pack. After the cold plate 310 is embedded in the groove 1101, it is tightly integrated with the bottom guard plate 110 through welding, bonding or mechanical clamping process, avoiding thermal resistance caused by gaps and greatly improving the heat conduction efficiency.

[0053] In addition, the design that the cold plate 310 is flush with part of the surface of the bottom guard plate 110 enables the bottom of the battery module 200 to be in large-area and uniform contact with the cold plate 310 and the bottom guard plate 110, ensuring stable support effect and ensuring that heat can be quickly and continuously conducted to the cold plate 310 for efficient heat dissipation through the cooling liquid circulation.

[0054] In addition, the groove 1101 structure is equivalent to a reasonable hollow design of the bottom guard plate 110, which utilizes space to accommodate the cold plate 310 without the need for additional space or components. Under the premise of ensuring the cooling and bearing functions, the overall compactness of the battery pack is improved, the materials for manufacturing the shell 100 are reduced, the weight of the battery pack is effectively reduced, and the lightweight of the electrical equipment is achieved.

[0055] The heat dissipation pad 320 is an interface material with temperature response characteristics, which can specifically adopt the structure of a paraffin-based phase change material encapsulating aerogel. Optionally, the heat dissipation pad 320 can be an elastic pad, and the elastic design improves the adhesion between the heat dissipation pad 320 and the battery 211.

[0056] Optionally, the heat dissipation pad 320 can include a heat insulation layer 322 and an encapsulation layer 321 covering the outside of the heat insulation layer 322, wherein the encapsulation layer 321 has high thermal conductivity, and the heat insulation layer 322 has heat insulation properties. The encapsulation layer 321 is in a solid state below a preset temperature to achieve heat conduction, and the encapsulation layer 321 melts above the preset temperature to expose the internal heat insulation layer 322 to form the heat insulation layer 322. This design enables the heat dissipation pad 320 to automatically switch the working mode according to the temperature of the battery 211, balancing the uniform temperature and the heat runaway protection requirements.

[0057] Optionally, the thickness of the cold plate 310 can be 5mm-8mm. For example, the thickness of the cold plate 310 can be 5mm, 6mm, 7mm, 7.5mm, etc.

[0058] Optionally, the diameter of the cooling flow channel 3101 can be 3mm-5mm. For example, the diameter of the cooling flow channel 3101 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0059] Optionally, the surface of the cold plate 310 facing the containing cavity 101 can be coated with an adhesive layer 400. For example, the adhesive layer 400 can be a heat-conducting structural adhesive, and the battery 211 is attached to the surface of the cold plate 310 through the heat-conducting structural adhesive.

[0060] In this application, when the cooling liquid flows in the cooling flow channel 3101, the cold plate 310 is in thermal contact with the bottom end of the battery module 200 to achieve efficient heat exchange. In addition, the inner surface of the bottom guard plate 110 is provided with a groove 1101 to embed the cold plate 310, improving the overall structural stability and optimizing the use of space, improving the lightweight of the battery pack, and the adjacent batteries 211 are separated by the heat dissipation pad 320. The heat dissipation pad 320 maintains a high thermal conductivity state during normal charging and discharging, promoting uniform heat distribution between the batteries 211. When a certain battery 211 abnormally heats up, the local temperature triggers the phase change of the heat dissipation pad 320, blocking the heat transfer to the adjacent battery 211, avoiding the chain reaction caused by heat diffusion, improving the heat exchange efficiency of the battery 211 while blocking the heat spread, achieving compactness of the battery pack structure, and optimizing thermal management.

[0061] In some embodiments, in combination with Figure 1 and Figure 2 The heat dissipation pad 320 includes an encapsulation layer 321 and a heat insulation layer 322, and the encapsulation layer 321 covers the outside of the heat insulation layer 322. The encapsulation layer 321 is configured to melt when the temperature of the battery 211 is higher than a preset temperature.

[0062] The encapsulation layer 321 is a material layer covering the outside of the heat insulation layer 322, which can be implemented by using a heat-conducting polymer material. At a normal temperature of the battery 211, the heat-conducting polymer material can transfer heat. When the temperature exceeds a preset value, the heat-conducting polymer material melts, thereby removing the wrapping effect on the heat insulation layer 322.

[0063] The thermal insulation layer 322 is a structural layer arranged between adjacent batteries 211 for blocking heat transfer, which can be implemented by silica gel, foam or aerogel. After the encapsulation layer 321 melts, the thermal insulation layer 322 independently plays a thermal insulation role to prevent heat from spreading between the batteries 211.

[0064] Specifically, the encapsulation layer 321 of the heat dissipation pad 320 remains solid and in contact with the surface of the battery 211 when the temperature of the battery 211 is normal, and transmits heat laterally to the cold plate 310 through thermal conduction, and also promotes the uniformity of the battery module 200 vertically; when the temperature of the battery 211 abnormally rises to a preset range, the encapsulation layer 321 melts under heat and separates from the surface of the thermal insulation layer 322, at which time the thermal insulation layer 322 is exposed and blocks the heat conduction path between adjacent batteries 211, thereby inhibiting the spread of thermal runaway.

[0065] Through the combined design of the encapsulation layer 321 and the thermal insulation layer 322, the heat insulation pad quickly cuts off the heat transfer path between adjacent battery cells when the temperature of the battery 211 is abnormal, realizes autonomous blocking of heat spread, effectively prevents a chain reaction caused by local overheating, and improves the speed and reliability of thermal safety protection.

[0066] In some embodiments, the thermal insulation layer 322 includes silica gel, foam or aerogel. Optionally, the thickness of the heat dissipation pad 320 is 1 mm-3 mm.

[0067] It can be understood that silica gel is a high-molecular elastomer with a three-dimensional network structure, which can be implemented by using high-temperature-resistant silica gel. The pores formed between the molecular chains can effectively block heat conduction. Foam is a porous foaming material, which can be implemented by using closed-cell polyethylene foam. The closed-cell structure inside the foam can form a thermal barrier layer.

[0068] Aerogel is a nano-porous solid material, which can be implemented by using silica aerogel. The low-density nano-skeleton structure of the aerogel can significantly reduce heat convection and heat conduction.

[0069] Optionally, the thickness of the heat dissipation pad 320 can be 1 mm, 1.5 mm, 2 mm, 2.8 mm, 3 mm, etc. The thickness range of the heat dissipation pad 320 is the vertical spacing range of the spacers arranged between adjacent batteries 211. In some examples, within this thickness range, effective heat conduction under normal working conditions can be ensured, and sufficient thermal insulation space can be formed when thermal runaway occurs.

[0070] In this way, when the temperature of the single battery 211 abnormally rises, the thermal insulation layer 322 can achieve temperature isolation, avoiding the chain reaction of thermal runaway of closely arranged battery cells under the CTB architecture.

[0071] In some embodiments, the preset temperature is 110-150°C. Alternatively, the preset temperature can be 110°C, 115°C, 120°C, 130°C, 140°C, 145°C, 150°C, etc. The temperature that the packaging layer 321 can withstand can be selectively designed according to actual use requirements, which is not limited here.

[0072] It can be understood that the preset temperature is a critical temperature threshold for triggering the heat dissipation function of the heat dissipation pad 320. In some examples, the temperature range is higher than the upper limit of the normal working temperature of the battery 211 and lower than the heat resistance limit of the material of the battery 211 shell 100, which can ensure normal heat dissipation efficiency while avoiding the risk of thermal runaway.

[0073] In this way, by designing the heat dissipation pad 320, the battery pack can start the thermal protection mechanism when the temperature of the battery 211 abnormally rises, effectively block the heat transfer path between the single batteries 211, prevent the thermal runaway chain reaction, and also avoid the false triggering caused by the instantaneous temperature rise in the normal fast charging process, thereby ensuring the high-power charging and discharging performance of the battery pack.

[0074] In some embodiments, in combination with Figure 1 , Figure 3 and Figure 4 , the cold plate 310 includes a flow channel body 311 and an interface pipe 312. The flow channel body 311 has at least one cooling flow channel 3101 formed inside. The cooling flow channel 3101 has a liquid inlet and a liquid outlet. The interface pipe 312 includes a liquid inlet pipe 3121 and a liquid outlet pipe 3122. The liquid inlet pipe 3121 is in communication with the liquid inlet, and the liquid outlet pipe 3122 is in communication with the liquid outlet. The flow channel body 311 is in circulation communication with an external liquid supply device through the liquid inlet pipe 3121 and the liquid outlet pipe 3122.

[0075] The flow channel body 311 is a component with a cooling liquid flow channel formed inside. Specifically, it can be manufactured by aluminum alloy extrusion molding process. The internal structure can be provided with a serpentine or parallel micro-flow channel structure to realize heat exchange between the cooling liquid and the battery module 200.

[0076] The interface pipe 312 is a transition component for connecting the external liquid supply device and the cooling flow channel 3101. Specifically, it can be a stainless steel welded joint or a quick plug sealing joint. The cooling flow channel 3101 is a path for the cooling liquid to flow inside the flow channel body 311. Alternatively, the direction and distribution density of the cooling flow channel 3101 can be selectively designed according to actual use requirements. By optimizing the flow channel direction and distribution density, the heat dissipation requirements of different areas of the battery module 200 can be locally strengthened.

[0077] Specifically, the cooling liquid enters the cooling flow channel 3101 in the flow channel body 311 from the external liquid supply device through the liquid inlet pipe 3121, flows along the preset path and absorbs the heat at the bottom of the battery module 200, and then the cooling liquid carrying the heat returns to the external liquid supply device through the liquid outlet pipe 3122 to complete the circulation.

[0078] Through the combination of the modular flow channel body 311 and the interface pipe 312, the circulation efficiency of the cooling liquid in the battery pack is improved, and the heat dissipation capacity of the high-heat-emitting area can be enhanced through selective optimization of the flow channel layout.

[0079] In some embodiments, in combination with Figure 3 and Figure 4 The flow channel body 311 includes a plurality of sub-flow channel bodies 3111, each of which is provided with a cooling flow channel 3101, and the extension direction of the sub-flow channel body 3111 is parallel to the extension direction of the cooling flow channel 3101; the cold plate 310 further includes a liquid distribution body 313 and a liquid collection body 314, the liquid distribution body 313 is connected with the liquid inlet of each cooling flow channel 3101, and the liquid inlet pipe 3121 is arranged in the liquid distribution body 313; the liquid collection body 314 is connected with the liquid outlet of each cooling flow channel 3101, and the liquid outlet pipe 3122 is arranged in the liquid collection body 314.

[0080] By arranging the plurality of sub-flow channel bodies 3111 in parallel, the cooling path can be optimized for different areas. Optionally, the liquid distribution body 313 can be a metal pipe with a distribution cavity inside, used to distribute the cooling liquid to the plurality of sub-flow channel bodies 3111, and the distribution cavity is communicated with the liquid inlet of each sub-flow channel body 3111 through a plurality of branch channels.

[0081] Optionally, the liquid collection body 314 can be a metal pipe with a collection cavity inside, used to collect the return flow of the cooling liquid of each sub-flow channel body 3111, and the collection cavity is communicated with the liquid outlet of each sub-flow channel body 3111 through a plurality of collection channels.

[0082] Specifically, the cooling liquid enters the distribution cavity of the liquid distribution body 313 through the liquid inlet pipe 3121, the distribution cavity uniformly distributes the cooling liquid into the cooling flow channel 3101 of each sub-flow channel body 3111, the cooling liquid flows along the extension direction of the sub-flow channel body 3111 and exchanges heat with the battery module 200, and then the cooling liquid is collected by the collection cavity of the liquid collection body 314 and discharged through the liquid outlet pipe 3122.

[0083] Among them, since the plurality of sub-flow channel bodies 3111 are arranged independently and the extension direction is consistent with the cooling flow channel 3101, the flow path of the cooling liquid in the flow channel is shortened, the flow resistance is reduced, and the cooling flow channel 3101 of each sub-flow channel body 3111 can be designed to selectively design the distribution density according to the heat dissipation requirements of different areas of the battery module 200.

[0084] The plurality of sub-flow channel bodies 3111 are arranged in parallel through the distribution liquid 313 and the collection liquid 314, the cooling liquid flows synchronously in the plurality of independent flow channels, the flow path is dispersed, the pressure drop is more uniform, the cooling liquid distribution uniformity is improved, the overall heat dissipation efficiency of the battery module 200 is enhanced, and the risk of thermal runaway caused by local overheating is avoided.

[0085] In some embodiments, in combination with Figure 3 , the upper surface of the cold plate 310 is flush with the part of the inner surface of the bottom guard plate 110 except the groove 1101, and the cold plate 310 and the bottom guard plate 110 are adapted to jointly bear the battery module.

[0086] It can be understood that the inner surface of the bottom guard plate 110 is provided with the groove 1101, that is, the side of the bottom guard plate 110 facing the battery module 200 forms a recessed structure, which can be used to position the cold plate 310 and limit its displacement, and also maintains the contact area of the cold plate 310 and the bottom guard plate 110.

[0087] Optionally, the cold plate 310 is embedded in the groove 1101, that is, the cold plate 310 is embedded in the recessed area of the bottom guard plate 110, which can be achieved by welding, bonding or mechanical clamping process. The cold plate 310 and the bottom guard plate 110 form an integrated structure by embedding, and the thermal conductivity is improved by improving the connection tightness.

[0088] In this way, the inner surface of the bottom guard plate 110 is provided with the groove 1101 to embed the cold plate 310, which improves the overall structural stability and optimizes the space utilization. The groove 1101 plays a positioning role for the cold plate 310 and limits its displacement during the working process of the battery pack. After the cold plate 310 is embedded in the groove 1101, a tight integrated structure is formed with the bottom guard plate 110 through welding, bonding or mechanical clamping process, which avoids the thermal resistance caused by the gap and greatly improves the thermal conductivity.

[0089] In addition, the design that the cold plate 310 is flush with part of the surface of the bottom guard plate 110 enables the bottom of the battery module 200 to be in large-area and uniform contact with the cold plate 310 and the bottom guard plate 110, ensuring stable support effect and ensuring that heat can be quickly and continuously conducted to the cold plate 310 for efficient heat dissipation through cooling liquid circulation. In addition, the groove 1101 structure is equivalent to a reasonable hollow design of the bottom guard plate 110, which utilizes space to accommodate the cold plate 310 without the need for additional space or components. Under the premise of ensuring cooling and bearing functions, the overall compactness of the battery pack is improved, the amount of material for the shell 100 is reduced, the weight of the battery pack is effectively reduced, and the lightweight of the electrical equipment is realized.

[0090] In some embodiments, in combination with Figure 1 and Figure 3 The bottom guard plate 110 includes a base body 111 and a heat-conducting layer 112, and the heat-conducting layer 112 is arranged on the side of the base body 111 facing the accommodating cavity 101.

[0091] The heat conduction layer 112 is a functional layer arranged on the surface of the base body 111 for enhancing heat conduction, which can be implemented by a metal layer, such as an aluminum plate or a copper plate, fixed on the surface of the base body 111 by welding or bonding, and can quickly transfer heat between the battery module 200 and the cold plate 310 through high heat conduction characteristics.

[0092] The heat conduction layer 112 covers the surface of the base body 111 facing the battery module 200, and forms a continuous heat conduction path with the cold plate 310. When the battery module 200 generates heat, the heat is transferred to the cooling liquid flowing inside the cold plate 310 through the heat conduction layer 112. This layered structure maintains the rigidity of the bottom guard plate 110 while optimizing the heat transfer efficiency through the directional heat conduction path.

[0093] In this way, the balance between lightweight and efficient heat dissipation of the battery pack bottom structure is achieved. The synergistic effect of the base body 111 and the heat conduction layer 112 enables the heat to be quickly conducted from the battery module 200 to the cooling system, effectively preventing the accumulation of heat at the bottom of the battery module 200.

[0094] In addition, the layered design of the collective and the heat conduction layer 112 can also adjust the thickness or material of the heat conduction layer 112 according to actual needs, such as configuring a thicker copper layer in high heat generation areas to enhance the heat dissipation capacity, thereby improving the adaptability and safety of the overall thermal management system.

[0095] In some embodiments, the base body 111 is a heat-conducting polymer material, and the heat conduction layer 112 is a metal layer, which is arranged on the side of the base body 111 facing the accommodating cavity 101.

[0096] It can be understood that the base body 111 is a component that constitutes the main structure of the bottom guard plate 110, which can be implemented by using a high-molecular composite material with heat conduction properties such as polyamide, polyphenylene sulfide, or polyether ether ketone, so that the base body 111 can transfer heat while providing structural support.

[0097] The heat conduction layer 112 is a functional layer covering the surface of the base body 111, which can be implemented by using a metal material such as aluminum, copper, or aluminum alloy. The heat conduction layer 112 can quickly conduct the heat generated by the battery module 200 to the cold plate 310, thereby improving the heat dissipation efficiency.

[0098] Specifically, the bottom protection plate 110 can ensure heat dissipation efficiency while maintaining structural support through the combined structure of the base body 111 and the heat conduction layer 112. The base body 111 is made of a heat-conductive polymer material that can meet the structural strength requirements of the battery pack and can also achieve heat transfer through the heat conduction characteristics of the material itself. The heat conduction layer 112 is arranged on the side of the base body 111 facing the battery module 200, and the high heat conductivity of the metal material accelerates the transfer of heat from the battery module 200 to the cold plate 310.

[0099] Optionally, a transition layer can be arranged between the base body 111 and the heat conduction layer 112, such as a heat-conductive adhesive or a metal foil, to reduce the interface thermal resistance.

[0100] Optionally, the thickness of the heat conduction layer 112 can be adjusted according to the heat load, so as to ensure heat conduction efficiency and avoid excessive weight increase.

[0101] In this way, by designing the composite structure of the base body 111 and the heat conduction layer 112, the heat transfer efficiency between the battery module 200 and the cold plate 310 is effectively improved, and the bottom protection plate 110 also has certain structural strength. The design of the heat-conductive polymer material of the base body 111 can avoid local heat accumulation, and the heat-conductive metal layer 112 further strengthens the longitudinal heat conduction path. The synergistic effect of the two can reduce the temperature gradient of the battery 211 and prevent the risk of thermal runaway.

[0102] In some embodiments, in combination with Figure 1 and Figure 3 , the shell 100 further includes a surrounding plate 120 and a cover plate 130, wherein the surrounding plate 120 is arranged around the bottom protection plate 110, and the cover plate 130 is arranged on the side of the surrounding plate 120 away from the bottom protection plate 110. The bottom protection plate 110, the surrounding plate 120, and the cover plate 130 collectively form the accommodation cavity 101.

[0103] Optionally, the bottom protection plate 110 and the surrounding plate 120 are integrally formed, and the accommodation cavity 101 can be formed by stamping. Optionally, the cover plate 130 and the surrounding plate 120 can be connected by clamping, pasting, or other connection methods.

[0104] The bottom protection plate 110, the surrounding plate 120, and the cover plate 130 collectively form the accommodation cavity 101, so that the entire battery pack forms a closed and stable space, providing good protection for the battery module 200 and the cooling assembly 300, preventing external environmental factors such as dust and moisture from damaging the internal components of the battery pack. At the same time, it also ensures the structural stability of the battery pack under various working conditions, enhancing the overall safety and reliability of the battery pack.

[0105] In some embodiments, the battery pack further comprises a plurality of temperature sensors, which can correspond to the batteries 211 one by one to monitor the temperature of each battery 211. Optionally, the temperature sensors can be used to connect a display screen or a control module.

[0106] In some embodiments, the embodiments of the present application also provide a power consuming device, which can be a new energy vehicle. For example, the power consuming device can be a pure electric vehicle, a plug-in hybrid electric vehicle, a range-extended electric vehicle, a commercial vehicle, etc. The power consuming device comprises the above battery pack.

[0107] The power consuming device is provided with the above battery pack, the cold plate 310 realizes efficient heat dissipation of the battery module 200, the heat dissipation pad 320 improves the uniform distribution of heat of the batteries 211, and can block the heat transfer to the adjacent batteries 211 at a preset temperature, thereby avoiding the chain reaction caused by heat diffusion and improving the use safety of the power consuming device.

[0108] Finally, it should be noted that: other embodiments of the application will be readily apparent to those skilled in the art with the disclosure herein in consideration. The present application is intended to cover any variations, uses or adaptive changes of the present application that follow the general principles of the present application and include common knowledge or conventional technical means in the art that are not disclosed by the present application, and are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A battery pack, characterized in that: include: A housing (100) is provided with a receiving cavity (101), the housing (100) comprising a bottom guard plate (110), and an inner surface of the bottom guard plate (110) is provided with a groove (1101); A battery module (200) includes at least one battery pack (210), wherein the battery pack (210) includes a plurality of batteries (211) arranged side by side; A cooling assembly (300) comprising: a cold plate (310), the cold plate (310) being arranged on the bottom guard plate (110) and being in thermal contact with the bottom end of the battery module (200), a cooling channel (3101) for circulating a coolant being formed in the cold plate (310), the cold plate (310) being embedded in the groove (1101), and at least a portion of the inner surface of the bottom guard plate (110) being flush with the upper surface of the cold plate (310); A heat dissipation pad (320) is provided between two adjacent batteries (211), the heat dissipation pad (320) being in at least thermal contact with the batteries (211) on both sides, and the heat dissipation pad (320) being configured to conduct heat when the temperature of the batteries (211) is lower than a preset temperature, and to insulate heat when the temperature of the batteries (211) is higher than the preset temperature.

2. The battery pack according to claim 1, wherein: The heat dissipation pad (320) comprises: a packaging layer (321) and a heat insulation layer (322); the packaging layer (321) is coated on the outside of the heat insulation layer (322); and the packaging layer (321) is configured to melt when the temperature of the battery (211) is higher than a preset temperature.

3. The battery pack according to claim 2, wherein: The heat insulation layer (322) includes silica gel, foam or aerogel; and / or the heat dissipation pad (320) has a thickness of 1 mm to 3 mm.

4. The battery pack according to claim 1, wherein: The preset temperature is 110°C-150°C.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The cold plate (310) comprises: A flow channel body (311), wherein at least one cooling flow channel (3101) is formed inside the flow channel body (311), and the cooling flow channel (3101) has a liquid inlet and a liquid outlet; The interface tube (312) comprises a liquid inlet tube (3121) and a liquid outlet tube (3122), wherein the liquid inlet tube (3121) is in communication with the liquid inlet, and the liquid outlet tube (3122) is in communication with the liquid outlet, and the flow channel body (311) is in circulation communication with an external liquid supply device via the liquid inlet tube (3121) and the liquid outlet tube (3122).

6. The battery pack according to claim 5, characterized in that: The flow channel body (311) comprises: a plurality of sub-flow channel bodies (3111), each of the sub-flow channel bodies (3111) being provided with a cooling flow channel (3101), and an extension direction of the sub-flow channel body (3111) being parallel to an extension direction of the cooling flow channel (3101); The cold plate (310) further comprises: A liquid separator (313) is respectively connected to the liquid inlets of the plurality of cooling channels (3101), and the liquid inlet pipe (3121) is provided on the liquid separator (313); The liquid collecting body (314) is respectively connected to the liquid outlets of the plurality of cooling channels (3101), and the liquid outlet pipe (3122) is provided on the liquid collecting body (314).

7. The battery pack according to any one of claims 1 to 4, characterized in that: The upper surface of the cold plate (310) is flush with the inner surface of the bottom guard plate (110) except for the groove (1101), and the cold plate (310) and the bottom guard plate (110) are suitable for carrying the battery module (200).

8. The battery pack according to any one of claims 1 to 4, characterized in that: The bottom guard plate (110) comprises: matrix (111); A heat-conducting layer (112) is provided on a side of the base (111) facing the accommodating cavity (101).

9. The battery pack according to claim 8, characterized in that: The substrate (111) is a heat-conducting polymer material; and / or the heat-conducting layer (112) is a metal layer.

10. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 9.

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