198 results about "Battery fluid" patented technology

The invention provides an energy storage battery liquid cooling dual-mode heat management and battery storage space heat recovery temperature and humidity coordinated regulation and control system and method. The system is composed of a heat pipe cooling module, a steam compression refrigeration cycle module and a module for waste heat recovery and runner regeneration. The heat pipe cooling module and the circulating pump form a natural cooling loop through the liquid cooling plate and the heat pipe heat exchanger; the vapor compression refrigeration cycle module efficiently and rapidly reduces the temperature of cooling liquid through a phase change refrigeration working medium. And the waste heat recovery module uses condensation waste heat for rotary wheel dehumidification regeneration. The system automatically switches double modes according to the temperature of cooling liquid: heat pipe energy-saving cooling is started when the temperature is lower than or equal to 35 DEG C, steam compression refrigeration is switched when the temperature is higher than 35 DEG C, and condensation waste heat of the two modes preheats regenerated air through a heat pipe heat exchanger, then the temperature is supplemented to the regeneration temperature through an electric heater, a rotating wheel is driven to dehumidify, and dry air is fed into a battery cabin. The method gives consideration to energy efficiency and thermal safety, and is suitable for thermal management and space humidity regulation and control of an energy storage battery system.

The utility model relates to the technical field of battery packs, and particularly discloses a battery liquid cooling system and a battery pack. The system comprises at least two liquid cooling flow path modules, all the liquid cooling flow path modules are sequentially arranged in the first direction, and each liquid cooling flow path module comprises a plurality of coiled pipes and a plurality of expansion connection pipes; all the coiled pipes are arranged side by side at intervals in the first direction, the coiled pipes extend in the second direction, turn-back flow channels extending in the length direction of the coiled pipes are arranged in the coiled pipes, and the liquid inlet ends and the liquid outlet ends of the coiled pipes are arranged at the two ends of the turn-back flow channels correspondingly and located at the same ends of the coiled pipes in the length direction; every two adjacent coiled pipes are in expanded connection and communication through two expanded connection pipes, one of the two expanded connection pipes is a liquid inlet pipe, the other expanded connection pipe is a liquid outlet pipe, the liquid inlet pipe is communicated with the upper liquid inlet end of the coiled pipe, and the liquid outlet pipe is communicated with the upper liquid outlet end of the coiled pipe. According to the system, through structural improvement, flow uniformity and low flow resistance are guaranteed, and the space proportion of the whole system in a battery pack is reduced.

The invention relates to a multi-element integrated thermal management system of a pure electric refrigerator car and a regulation and control method, a three-in-one liquid cooling framework is adopted, a passenger compartment air conditioner, power battery thermal management and a refrigerating box refrigerating system are integrated, a passenger compartment liquid cooling loop, a battery liquid cooling loop and a main liquid cooling loop share a cooling liquid circulation loop, the system energy consumption is reduced, and the system energy consumption is reduced. Through main liquid cooling loop sharing, the number of water pumps and valves is reduced, and the cost and the system complexity are reduced; a dynamic priority control strategy and a waste heat recovery mechanism are adopted, the flow direction and flow distribution of cooling liquid are adjusted in real time according to the vehicle running state, and the overall efficiency of the system is optimized; a system loop is switched by means of an electromagnetic valve, so that the refrigeration efficiency is optimized, collaborative optimization of cab heating, cargo compartment refrigeration and power battery temperature control is achieved, and efficient distribution and application of energy are achieved.

A device cooling system includes a vehicle-mounted device, a main controller, and a valve set. A liquid inlet pipe and a liquid outlet pipe are disposed on the vehicle-mounted device, the liquid inlet pipe is connected to the valve set, the valve set is connected to an electric drive liquid-cooling loop to form a first path, the valve set is connected to a battery liquid-cooling loop to form a second path, and the valve set is configured to switch a switch status to control to connect the first path or the second path. A temperature and humidity detection apparatus is disposed in the vehicle-mounted device. The main controller is configured to: obtain a dew point temperature based on a temperature and humidity that are detected by the temperature and humidity detection apparatus, and control, based on the dew point temperature, the valve set to switch the switch status.

The utility model provides a lithium battery liquid cooling plate and a lithium battery. The lithium battery liquid cooling plate comprises a plate body, a liquid cooling channel is arranged in the plate body, and the liquid cooling channel is provided with a liquid inlet and a liquid outlet; and the fin group is arranged in the liquid cooling flow channel and is used for carrying out turbulent flow on the cooling liquid in the liquid cooling flow channel, the fin group comprises a plurality of sub-fins, and the extension directions of at least two sub-fins in the plurality of sub-fins are arranged at an angle. The lithium battery liquid cooling plate solves the problem of limited heat dissipation effect of the lithium battery liquid cooling plate in the prior art.

The invention discloses a thermal management system of an electric truck. The thermal management system of the electric truck comprises an air conditioner compressor refrigeration subsystem, a battery liquid cooling subsystem and an electrically-driven cooling liquid subsystem, the battery liquid cooling subsystem comprises a battery pack, and the battery pack is sequentially connected with an electric heater, a first battery cooler, a first battery water pump, a first multi-way water valve and a second multi-way water valve in series to form a first battery heat exchange loop. The battery pack is sequentially connected with a second battery water pump and a second battery cooler in series through a second multi-way water valve to form a second battery heat exchange loop, the first battery heat exchange loop is coupled with the air conditioner compressor refrigeration subsystem through a first battery cooler, and the first battery heat exchange loop is coupled with the electric drive cooling liquid subsystem through a first multi-way water valve. And the battery heat exchange loop II is coupled with a battery auxiliary cooling refrigerant subsystem through a battery cooler II. The problem that in the prior art, the heat dissipation requirement during charging of a heavy truck battery pack cannot be met is solved.

The invention discloses a method for testing the liquid substance content of a battery through staged vacuum heating, and relates to the technical field of battery tests.The method comprises the steps that breaking treatment is conducted on the battery, temperature platforms are started step by step according to the ascending sequence direction of numbers to heat the battery, and in the heating process of each temperature platform, the number of the temperature platforms is increased; carrying out vacuumizing operation according to preset pulse vacuumizing parameters; judging whether the battery quality of the current temperature platform is stable or not according to the current weight loss ratio; if yes, correcting or adjusting according to the weight loss ratio; if so, starting a next temperature platform for heating according to the ascending direction of the numbers to obtain a final battery quality value; and obtaining the liquid substance content of the battery according to the initial mass value and the final mass value of the battery. The method provides guarantee for accurate determination of the liquid substance content of the battery.

The invention discloses a power battery liquid cooling temperature judgment method and system. The method comprises the following steps: collecting current data of a power battery, judging the charging and discharging state of the power battery, and calculating and outputting working state data; state data of the power battery and the cooling liquid are collected, and a state parameter set is obtained; analyzing the state parameter set and the working state data to obtain a temperature change trend parameter, and calculating and outputting a temperature state score; a historical temperature database is preset, the temperature state is compared with the historical temperature database, and a temperature judgment result is output. The method is used for solving the technical problems that in the prior art, temperature judgment is difficult to adapt to complex and changeable operation working conditions of a power battery, and the high-precision temperature management requirement cannot be met.

The utility model discloses a lithium ion battery fluid collecting device, and belongs to the technical field of lithium ion battery detection auxiliary equipment. The device is provided with a gas collection chamber, a puncture device arranged at the gas inlet end of the gas collection chamber, and an exhaust soft rubber sealing joint arranged at the exhaust end of the gas collection chamber, the flexible glue adsorption head is mounted at the bottom end of the puncturing device and is used for being adsorbed on the surface of the lithium ion battery in a sealing manner; the bottom end of the puncture device is provided with a puncture needle capable of penetrating into a closed cavity formed by the flexible glue adsorption head and the surface of the lithium ion battery, and the bottom end of the puncture device is further provided with an adjusting device which can be penetrated by the puncture needle and is used for compensating the length of the puncture device. The gas collecting device has the advantages of being simple in structure, convenient to operate and high in gas collecting efficiency.

The invention relates to the technical field of lithium battery systems, in particular to a header pipe for a liquid cooling plate of a new energy lithium battery, which comprises a substrate and a vapor chamber, the vapor chamber comprises a harmonica-shaped tube, an upper header pipe, a lower header pipe and a pipe joint, the upper header pipe is located above the lower header pipe, and the lower header pipe is located above the base plate. The two groups of pipe joints are respectively communicated with the upper collecting pipe and the lower collecting pipe, the harmonica-shaped pipe is of a U-shaped design, two ends of the harmonica-shaped pipe are respectively communicated with the upper collecting pipe and the lower collecting pipe, the base plates are hot pressing films and are respectively arranged on the upper side and the lower side of the vapor chamber, and a plurality of groups of first heat insulation blocks are arranged between the upper collecting pipe and the lower collecting pipe. The first heat insulation block is fixedly installed at the bottom end of the upper collecting pipe, and an installation block is fixedly installed on the side, close to the pipe connector, of the top end of the lower collecting pipe. And by using the first heat insulation blocks, the upper collecting pipe and the lower collecting pipe are separated, heat transfer caused when the upper collecting pipe and the lower collecting pipe are attached is avoided, and the cooling effect of low-temperature cooling liquid in the collecting pipes on the vapor chamber is improved.

This invention relates to an intake air preheating control system for electronically controlled diesel engines used in special vehicles, comprising an engine controller (ECU), a liquid heater, a battery, a liquid heater switch, a relay, and a grille heater. The invention also relates to a control method, comprising the steps of: acquiring coolant temperature, intake air temperature, and atmospheric pressure; calculating a weighted temperature and preheating time; comparing the weighted temperature with a coolant temperature threshold at the end of boiler heating; checking the liquid heater switch closure signal; determining whether the liquid heater should exit the heating process; allowing intake air preheating; setting the preheating time; performing intake air preheating; and ending preheating. This invention effectively improves the cold-start performance of electronically controlled diesel engines in low-temperature environments below -35°C and saves battery power.

The invention relates to a composite coating for protecting a liquid cooling plate of a new energy power battery and a preparation method of the composite coating. The invention relates to a modified graphene / Cu-ZIF-8 double-carrier composite photocatalyst, which is prepared from the following raw materials in parts by weight: 70 to 90 parts of modified MXene / graphene double-carrier, 5 to 12 parts of core-shell structure Cu-ZIF-8 double-carrier powder, 15 to 25 parts of alkali-soluble acrylic copolymer resin, 0.5 to 1.5 parts of KH-570, 0.2 to 0.8 part of fluorocarbon surfactant L30, 8 to 12 parts of zinc phosphate, 8 to 12 parts of mica powder, 12 to 18 parts of polyamide wax, 2 to 4 parts of K-7318 and 12 to 18 parts of kieselguhr. Wherein the Cu (at) ZIF-8 (at) double-carrier powder with the core-shell structure is of a core-shell structure formed by in-situ growth of Cu (at) ZIF-8 on an MXene / graphene interface. According to the invention, a comprehensive protective layer with super-hydrophobicity, corrosion resistance, antibacterial property and high adhesive force is provided for the liquid cooling plate, and the performance is excellent.

The invention relates to the technical field of battery liquid cooling plates, and discloses a battery liquid cooling plate flow channel design and optimization method based on topological optimization, and the method comprises the following steps: S1, constructing an initial geometric model of a battery liquid cooling plate: collecting the actual installation space size of a target battery pack, the distribution position of an internal heating element, and the overall heat dissipation demand parameters; according to the method, in the initial model building stage, namely, the battery pack installation space, heating element distribution and heat dissipation requirements are deeply collected, the heat dissipation efficiency maximization target of topological optimization is combined, a high-heating area can be accurately covered with a flow channel, the problem that traditional flow channels are evenly distributed but local heat dissipation is insufficient is solved, and the heat dissipation efficiency of a battery pack is improved through flow field and temperature field simulation. The liquid cooling plate can ensure that the wall temperature of the liquid cooling plate is always lower than the safety working upper limit of the battery, effectively inhibits the performance degradation or safety risk caused by local overheating of the battery, is especially suitable for a high-power-density battery pack, and prolongs the cycle life of the battery.

This invention relates to the field of battery liquid cooling technology, specifically to a liquid cooling water replenishment device for electronic components. The device includes a battery liquid cooling assembly, a liquid cooling circulation assembly, a heat dissipation assembly, a coolant storage assembly, a water replenishment pipe with an L-shaped connector, and a control assembly. The two ends of the liquid cooling circulation assembly are connected to the battery liquid cooling assembly and the heat dissipation assembly, respectively. The coolant storage assembly is connected to both the liquid cooling circulation assembly and the heat dissipation assembly. This application utilizes a double-layer liquid cooling system to ensure the cooling effect of the upper liquid cooling layer even when coolant is depleted, ensuring the battery assembly can operate in a suitable temperature environment. Furthermore, the detection of reduced or interrupted flow in the lower liquid cooling layer controls the operation of corresponding components for replenishment. The coolant storage assembly also facilitates rapid and sealed replenishment, ensuring the quality of the added coolant and preventing the entry of foreign matter.

An electro-energy or electro-synthetic cell, including a cathode, an anode and an electrode separator positioned between the cathode and the anode. A liquid electrolyte inlet supplies a liquid electrolyte to the cell, and a liquid electrolyte outlet removes the liquid electrolyte from the cell. The liquid electrolyte outlet includes an overflow weir over or through which excess liquid electrolyte flows out of the cell. In another form, one or more drippers are included as part of the liquid electrolyte inlet and / or the liquid electrolyte outlet and drip chambers are positioned below the drippers. In another form, one or more porous capillary structures are located in liquid pathways in the cell, for example in a liquid pathway provided by an overflow weir or adjacent a dripper. In another form, one or more restrictors are utilised that create a pressure drop in the liquid electrolyte passing through the restrictor.

The utility model discloses a power battery liquid cooling device which comprises an installation bin, a cooling device is arranged in the installation bin and comprises a cooling box, a connecting pipe and a box cover, the box cover is installed at the top end of the cooling box, the top end of the box cover is connected with an adjusting device, and the adjusting device comprises a fixed pipe, an adjusting sleeve, a movable sleeve, an outer sleeve, an inner rod, an adjusting block and an adjusting groove. The movable sleeve is connected with the connecting pipe through threads, the outer sleeve is arranged on the outer side of the inner rod in a sleeving mode, the adjusting block is in sliding connection with the adjusting groove, and a locking mechanism is arranged on the outer side of the connecting pipe and comprises a reset plate, a sliding sleeve, a vertical plate, a transverse plate, a reset block, a reset hole, a fixing block, a reset groove, a reset spring and a reset rod. According to the power battery liquid cooling system, the working efficiency of the power battery liquid cooling system is improved, stable control over the temperature of the battery is guaranteed, meanwhile, the service life of the battery is prolonged, and the safety of the battery is improved.

The application relates to a high-strength composite plate ingot blank for a battery liquid cooling plate and a preparation method thereof. The application aims to solve the problem of low yield rate of aluminum alloy flat ingots caused by casting forming difficulty and slag inclusion in a steady state during casting by using an existing method. The high-strength composite plate ingot blank for the battery liquid cooling plate is made of Si, Cu, Mn, Mg, Zn, Ti, Zr, Be, Fe and Al. The method comprises the following steps: S1, weighing smelting raw materials; S2, sequentially smelting the smelting raw materials; and S3, casting the alloy melt to obtain an aluminum alloy flat ingot. The application improves an existing smelting process, reduces the generation of ingot crack defects by combining scientific proportioning of components and fine operation in a production process, and makes the yield rate of the ingot reach 83%. The application is applied to the preparation field of the ingot for the battery liquid cooling plate.

The invention discloses profiling foam for a battery liquid cooling plate, the foam is a polyolefin resin foaming sheet containing polypropylene resin, the DSC melting peak temperature Tm of the polyolefin resin foaming sheet is 140-160 DEG C, the crosslinking degree G is 20-60%, the polyolefin resin foaming sheet is heated for 2-5 minutes in an oven with the oven temperature t being T + / -5 DEG C, T = Tm + (G / 4) DEG C, and the profiling foam has specific dimensional change rates in the MD, TD and ZD directions. The profiling foam for the battery liquid cooling plate is stable in size under the influence of environmental factors such as temperature and humidity, can adapt to a zigzag complex structure of the liquid cooling plate and is tightly attached, meanwhile, excellent impact absorbability and supporting stability are kept, and the problem of condensation of condensate water can be further effectively solved.

This invention relates to an overload protection device and method for a subsoiler shovel based on hydraulic control. The overload protection device for the subsoiler shovel includes a four-bar linkage, a subsoiler unit, a hydraulic actuator, an adjustable dynamic damping buffer mechanism, a control system, and a hydraulic and power supply system. The hydraulic and power supply system includes a multi-channel hydraulic output port for the power machinery and an on-board battery. The hydraulic actuator includes a hydraulic cylinder, a pressure holding module, an overload unloading module, and an oil tank. Two adjustable dynamic damping buffer mechanisms are provided on the left and right sides of the hydraulic cylinder. Each adjustable dynamic damping buffer mechanism includes a first telescopic rod, a second telescopic rod, a first connecting piece, a second connecting piece, a nut, a spring seat, a spring, a first threaded rod, a second threaded rod, and a support plate. The control system includes a data acquisition unit and a control unit. This invention can control the subsoiler shovel to move quickly and accurately, the overload protection critical resistance value is easily adjustable, and the shovel quickly returns to its working state after overload protection.

The invention provides an energy storage battery liquid cooling plate module which comprises a battery module, a heat conduction assembly and a liquid cooling plate, the heat conduction assembly is arranged between the battery module and the liquid cooling plate, a channel area is arranged on the bottom end face, away from the heat conduction assembly, of the liquid cooling plate, and a channel which is perpendicular to the bottom end face and protrudes outwards is arranged in the channel area. The channel area comprises an inlet channel area, a first flowing channel area, a second flowing channel area and an outlet channel area, a connecting channel is arranged between the first flowing channel area and the second flowing channel area, and a first flow dividing channel is arranged between channels in the second flowing channel area connected with the outlet channel area. The second shunting channels are arranged between the channels in the connecting channel area, the extension direction of the first shunting channels and the extension direction of the second shunting channels are not on the same straight line, and the length between the second shunting channels is greater than or equal to the length of the second shunting channels, so that the temperature uniformity of the battery module in the charging and discharging process is better.

The utility model discloses a kind of self-recovery lower plastic and battery top cover, including lower plastic body, lower plastic body is provided with lower injection hole, the inner peripheral wall of lower injection hole is provided with deformation sealing part, deformation sealing part includes multiple deformation sealing sheet, in first state, deformation sealing part is in natural state, and deformation sealing sheet is inclined and set to upwards, first separation space is provided between adjacent deformation sealing sheet;In second state, deformation sealing part is in deformation state, and deformation sealing sheet is horizontally set, and adjacent deformation sealing sheet is set to adhere between;In third state, deformation sealing part is in deformation state, and deformation sealing sheet is inclined and set to downwards, third separation space is provided between adjacent deformation sealing sheet.Using the above scheme, provide a kind of self-recovery lower plastic and battery top cover, which prevents battery liquid overflow by sealing deformation sheet deformation covering upper injection hole when injection column is pulled out from lower injection hole.

The utility model provides a power battery liquid cooling device and power battery equipment. The battery liquid cooling device comprises a box body, a liquid cooling unit and a liquid conveying pipeline, the box body comprises box side walls, a box top wall, a box bottom wall and a side opening door, the box side walls, the box top wall and the box bottom wall form a closed storage space, the liquid cooling unit and the liquid conveying pipeline are arranged in the storage space, the side opening door is arranged on the box side walls, and the liquid conveying pipeline is arranged in the box side walls. And the liquid cooling unit is arranged on the inner side wall of the side opening door and is communicated with the liquid conveying pipeline. The power battery equipment comprises the power battery liquid cooling device and a plurality of battery packs, the power battery liquid cooling device is the power battery liquid cooling device, and each branch liquid conveying pipe is communicated with a cooling box of one battery pack. The power battery liquid cooling device and the power battery equipment are convenient and rapid to install, maintain and operate and high in efficiency.

The invention provides a battery liquid cooling control method, a vehicle and a storage medium, and relates to the technical field of battery liquid cooling control, and the method comprises the steps: obtaining the driving behavior data and energy consumption data of the vehicle, and the topographic data of a target road section; generating a path coding vector of the target road section according to the topographic data and the driving behavior data, and generating an abnormal score vector of the target road section according to the energy consumption data; and generating a joint feature vector according to at least one of the driving behavior data, the energy consumption data, the topographic data, the path coding vector and the abnormal scoring vector, inputting the joint feature vector into a pre-trained control instruction model, outputting a target control instruction of the battery liquid cooling system by the control instruction model, and controlling the battery liquid cooling system by using the target control instruction. According to the method, linkage modeling can be carried out on the path terrain and the power consumption behavior process, multiple factors such as the terrain, the load and the power consumption which cause the thermal risk of the battery are comprehensively considered, and a battery liquid cooling control strategy is generated and adjusted with higher precision.

The invention discloses a liquid-cooling and liquid-heating integrated regulation and control system and method for an energy storage power battery, the system comprises a PTC heater, a water pump and an expansion water tank in a liquid-heating system, the PTC heater is communicated with the water pump through a pipeline, the PTC heater is connected with a battery pack of a power battery through a liquid-heating pipeline, and the system is used for heating anti-freezing liquid and circularly heating the battery pack; the expansion water tank is communicated with the water pump through a pipeline and controls liquid adding or pressure adjusting. In the liquid cooling system, a heat exchanger, a compressor, a condenser and an electronic expansion valve are arranged, the heat exchanger is connected with a battery pack through a pipeline, and the compressor, the condenser and the electronic expansion valve are sequentially connected in series and form a refrigeration circulation loop with the heat exchanger; the liquid supply header pipe and the liquid return header pipe are provided with assemblies to be connected with the liquid heating system, the liquid cooling system and the battery pack respectively and used for controlling corresponding parts to work according to the battery temperature of the power battery so as to switch the operation mode, so that the power battery operates in the optimal working environment, and the stability of a product is improved.

The utility model provides an immersed battery liquid cooling device and an energy storage battery pack, and belongs to the field of battery liquid cooling, the immersed battery liquid cooling device comprises a heat exchange tube, the heat exchange tube is arranged in a shell and is positioned at the top of a battery, and the heat exchange tube is immersed below the liquid level of a heat-conducting medium; the infusion tube is arranged in the shell and located at the bottom of the battery, and through holes are distributed in the infusion tube. The circulating pump pumps the heat-conducting medium; a backflow opening is formed in the position, close to the liquid level of the heat-conducting medium, of the side wall of the shell and communicates with the liquid conveying pipe through a circulating pump, and the heat-conducting medium at the bottom of the shell is sucked through the through hole and then conveyed to the top of the shell through the backflow opening through the circulating pump. According to the utility model, the immersion liquid flows through the gaps of the batteries from top to bottom to form the cooling flow channels, the low-temperature immersion liquid continuously exchanges heat with the battery pack heating in the charging and discharging process, the high-temperature immersion liquid carrying heat flows back to the top of the box body again through the conveying of the circulating pump, the heat exchange pipe cools the backflow immersion liquid, and the process is repeated, so that the heat exchange efficiency is improved. And the low-temperature immersion liquid can uniformly and quickly flow through the surface of the battery.

The invention relates to a battery pack. The battery pack comprises a battery box, a plurality of battery liquid cooling units and a vapor chamber, the multiple battery liquid cooling units are sequentially arranged in the battery box in the first direction, and each battery liquid cooling unit comprises a liquid cooling plate and a battery pack detachably fixed to the liquid cooling plate. The battery pack includes a plurality of battery cells arranged side by side in a second direction. The liquid cooling plate comprises a wing plate and a web plate, and the web plate is vertically arranged on one side of the wing plate in the third direction. And each battery monomer is supported on the wing plate and is in heat-conducting connection with the web plate. A temperature equalizing plate is arranged between every two adjacent battery liquid cooling units, battery packs are arranged on two opposite sides of the temperature equalizing plate in the first direction, and the temperature equalizing plate is used for connecting the battery packs with the liquid cooling plate in a heat conduction manner. Wherein each battery liquid cooling unit is detachably mounted in the battery box through the liquid cooling plate. According to the technical scheme, disassembly and assembly of the battery pack can be simplified, the replacement cost of the battery pack is reduced, and the heat dissipation effect of the battery pack is improved.

Provided is a polyolefin microporous membrane which, when used as a battery separator, can impart high output characteristics and high safety, and which, when used as a liquid filter, can eliminate the tradeoff between small pore diameter and high permeability. When the arithmetic average roughness Sa (nm) of one surface and the other surface of the microporous membrane is set as Sa1 and the arithmetic average roughness Sa of the surface having a large arithmetic average roughness is set as Sa2, formula 1 and formula 2 are satisfied. When the intermediate value of the pore diameter based on the surface area determined by a water squeezing type porosity analyzer is set as Ds and the intermediate value of the pore diameter based on the pore volume is set as Dv, formula 3 is satisfied, and the puncture strength converted into the basis weight is 700 mN / (g / m < 2 >) or more. Formula 1: 10 < = (Sa1+Sa2) / 2 < = 80 Formula 2: Sa1 / Sa2 < = 1.4 Formula 3: 1.0 < = Dv / Ds < = 1.2

To properly arrange various members in a limited space below a driver's seat in a small working machine.SOLUTION: The hydraulic excavator 1 as the work machine includes the hydraulic pipes through which the hydraulic oil flows, the hydraulic pipes include the discharge pipe 51 and the discharge pipe 52 that discharge the hydraulic oil from the hydraulic oil tank 31 to the hydraulic valve disposed in front of the operator's seat 14, and the return pipe 53 that returns the hydraulic oil from the hydraulic valve to the hydraulic oil tank 31, and the discharge pipe 51, the discharge pipe 52, and the return pipe 53 are disposed below the operator's seat 14 in the vertical direction and above the battery, the hydraulic oil tank 31, and the electric motor 33 in the vertical direction.SELECTED DRAWING: Figure 6

The utility model belongs to the technical field of power batteries, and provides a liquid cooling assembly for a battery, a battery module unit and a battery, the liquid cooling assembly comprises a liquid cooling fin, the outer side wall of the liquid cooling fin is used for fixing a battery cell, a liquid cooling flow channel is arranged in the liquid cooling fin, and the liquid cooling flow channel comprises deformable sections which are arranged at intervals along the direction perpendicular to the extension direction of the liquid cooling flow channel, and the deformable section is provided with a continuous fluctuating structure along the extending direction of the liquid cooling flow channel to form an elastic deformation space capable of absorbing the transverse expansion of the battery cell. Compared with the prior art, the liquid cooling fins are internally provided with the liquid cooling flow channels in contact with the main surfaces of the battery cells, and the deformable sections are arranged at intervals in the direction perpendicular to the extension direction of the liquid cooling flow channels, so that the heat exchange efficiency between the liquid cooling fins and the battery cells is improved, and the heat exchange efficiency of the battery cells is improved on the premise of not additionally adding buffer materials. And transverse extrusion force generated by expansion of the battery cell is absorbed. The method improves the utilization rate of the internal space of the battery and reduces the manufacturing cost of the battery.