External heating and cooling device for power battery pack

Abstract

The present invention provides an external heating and cooling device for a power battery pack, comprising an outer shell with a accommodating chamber whose top can be opened and closed, and an integrated heating and cooling temperature control device arranged inside the outer shell and below the power battery; the integrated heating and cooling temperature control device automatically controls the temperature of the power battery under different temperature environments, and the cooling adopted by the integrated heating and cooling temperature control device is cooling by introducing air from outside through an axial flow fan and / or cooling by an air-conditioning compressor, and the heat exchange gas generated during the cooling process is discharged externally through the axial flow fan, and the heating is internal circulation of the gas, and the heating method is to heat the gas by blowing an electric heating wire through the axial flow fan.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries for electric vehicles, and more particularly to an external heating and cooling device capable of directly regulating the temperature of a vehicle power battery and providing good collision protection. Background Art

[0002] As electric vehicles are widely promoted today, the public is paying more and more attention to the problems of electric vehicles. The main problems are concentrated on the problems of electric vehicle batteries. There are five main issues:

[0003] 1. Sudden changes in temperature and range

[0004] Lithium-ion batteries are relatively sensitive to temperature, and temperature can be said to be the killer of lithium batteries in electric vehicles.

[0005] The operating temperature range of lithium batteries is generally between -20°C and 200°C. However, the temperature sensitivity of lithium batteries made of different materials varies.

[0006] Among them, lithium iron phosphate batteries, currently the most widely used in China, have good high-temperature performance but lack tolerance for low temperatures. Even some high-quality products can only release 80% of their energy at -20°C, while temperatures below -40°C often cause the battery to "freeze," resulting in irreversible damage to the internal material, such as crystallization.

[0007] Although some manufacturers have developed lithium iron phosphate batteries doped with manganese or olivine crystal structure, which can cope with lower temperatures, there will be significant discounts in power and mileage, and the cost is relatively high.

[0008] Lithium batteries made of ternary materials and lithium cobalt oxide, in addition to experiencing discharge attenuation at low temperatures (below -40°C), are also sensitive to high temperatures. When the operating temperature exceeds 220°C, irreversible damage will occur to the battery structure.

[0009] Therefore, we sometimes find that in a low temperature environment, the vehicle shows a long range before starting, but the value drops sharply during driving. This is often due to the reduction in the actual output power of the battery caused by the low temperature.

[0010] 2. Extreme spontaneous combustion

[0011] Electric vehicles are inherently safe. The lithium battery spontaneous combustion incidents that people worry about have become rare in recent years thanks to improvements in battery technology and processes.

[0012] Even if it does occur, it's usually in extreme cases, after a vehicle has suffered a serious traffic accident, resulting in disintegration and the failure of the battery safety protection system. Furthermore, lithium battery spontaneous combustion is also related to the battery materials used. The lithium batteries in our mobile phones, power banks, and electric bicycles typically use ternary materials or lithium cobalt oxide materials. These batteries are affected by the thermal instability of the materials and, when subjected to high temperatures, release flammable substances, causing the batteries to spontaneously combust or even explode.

[0013] Several previous spontaneous combustion incidents involving Tesla were caused by its use of lithium cobalt oxide batteries and its incomplete protective measures.

[0014] 3. Fast charging

[0015] The charging modes of electric vehicles usually include slow charging and fast charging.

[0016] For a battery with over 20 kWh of energy, it takes approximately eight hours to fully charge it from zero using a standard civilian power source. This is based on test conditions. In daily driving, the battery is unlikely to reach zero charge; typically, the minimum remaining charge is 10% to 20%. This means that a full charge is typically achieved in about six hours under normal use.

[0017] For a car like Tesla with an 85 kWh battery capacity, slow charging takes nearly 30 hours.

[0018] Therefore, many people hope to achieve fast charging, that is, to fully charge the battery in half an hour or less. For example, Tesla claims that its fast charger can be installed on the wall of a home or in a parking lot, which can shorten the charging time to 5 hours and charge 80% of the battery in 45 minutes.

[0019] However, most car manufacturers do not agree with the excessive use of this fast charging method.

[0020] Because shortening the charging time means, according to the law of conservation of energy, the charging current and voltage must be increased. Charging with high current and voltage will cause certain voltage shocks and overheating risks to the battery, leading to irreversible damage to the battery structure, greatly affecting the battery's cycle life.

[0021] For the vast majority of electric vehicles currently on sale, damage-free fast charging has not yet been achieved.

[0022] 4. Battery insurance problem

[0023] Batteries, a key component of electric vehicles, account for approximately 30% of the vehicle's total price. However, insurance companies currently struggle to offer separate coverage for battery damage. Even vehicle damage insurance does not cover battery damage.

[0024] For individuals, once there is a problem with the battery, the repair cost is high and there is no insurance coverage.

[0025] 5.Battery warranty issues

[0026] At present, in response to consumers' concerns about the quality and service life of electric vehicle batteries, various electric vehicle manufacturers have withdrawn their battery manufacturer warranty commitments.

[0027] Some promise that if there is any quality problem with the battery within 5 years and 100,000 kilometers, the battery will be replaced free of charge, while others promise that if there is any quality problem with the battery within 6 years and 150,000 kilometers, BYD even offers permanent free replacement of the battery.

[0028] We have found that larger and more technologically advanced companies have longer battery warranty periods and mileage. This demonstrates our companies' confidence in their products.

[0029] On the other hand, we find that there is a lack of detailed commitments among these commitments.

[0030] First, there's a lack of clear standards for determining battery quality issues. Intuitively, a significant decrease in battery range over a short period of time, or frequent sudden drops in battery charge while driving, could be evidence of a battery problem. However, these intuitive phenomena lack corresponding technical data to serve as a criterion.

[0031] In addition, how to determine whether the failure is caused by battery quality problems or improper use by consumers is also a controversial issue.

[0032] In summary, we can know that the core factors that determine electric vehicles are battery performance, battery safety, and battery life. However, when considering these core functions, temperature and collision deformation will be mentioned. However, at present, there has not yet been a device that can comprehensively optimize battery performance, battery safety, and battery life based on existing batteries (referring to the materials used in existing batteries). Summary of the Invention

[0033] In response to the technical problems raised above, a battery temperature control device is provided, which can directly regulate the temperature of a vehicle power battery and provide good collision protection.

[0034] The technical means adopted in the present invention are as follows:

[0035] An external heating and cooling device for a power battery pack, comprising:

[0036] An outer shell with a accommodating chamber whose top can be opened and closed, and an integrated cooling and heating temperature control device arranged inside the outer shell and below the power battery;

[0037] The above-mentioned integrated cooling and heating temperature control device includes:

[0038] A heat exchange base installed at the bottom of the internal chamber of the outer shell, a battery support seat installed at the top above the heat exchange base and in contact with the lower end of the power battery, a cooling header, a heating header, a cooling axial flow fan, a heating axial flow fan, several heating wire reels and several float plunger valves;

[0039] Both the cooling axial flow fan and the heating axial flow fan have two outlet pipes, and one outlet pipe is connected to the cooling header inlet through a tee, and the other outlet pipe is connected to the heating header inlet through a tee;

[0040] Each three-way inlet is equipped with a one-way check valve;

[0041] The upper end surface of the heat exchange base is processed with a plurality of semicircular strip holes with a transverse cross section, and the lower end surface of the battery support base is processed with strip holes corresponding to the strip holes on the upper end surface of the heat exchange base. When the lower end surface of the battery support base is engaged with the upper end surface of the heat exchange base, the corresponding strip holes interlock with each other to form a transverse through hole;

[0042] Each of the through holes is embedded with a heating wire reel;

[0043] The above-mentioned heating wire reel comprises: a heating wire and a reel support;

[0044] The heating wire is coiled and wound on the outer wall of the reel support to form a heating wire reel. The outer wall of the reel support is provided with a plurality of spacer blocks for separating adjacently wound heating wires.

[0045] The reel bracket, heat exchange base and battery support are made of high-strength aluminum alloy;

[0046] The upper end surface of the battery support seat in contact with the battery is processed with a plurality of strip grooves that are staggered horizontally and vertically and connected, and each groove parallel to the through hole is processed with a plurality of vertical holes that are connected to the corresponding through hole;

[0047] The number of branch pipes of the cooling header is the same as the number of through holes and is connected to one end opening of the through holes, and the number of branch pipes of the heating header is the same as the number of through holes and is connected to the other end opening of the through holes;

[0048] The air inlet of the heating axial flow fan is located inside the outer shell and is provided with a one-way check valve;

[0049] The air inlet of the refrigeration axial flow fan is placed outside the outer shell and is provided with a one-way check valve and a float plunger valve;

[0050] The control device for the power-on state of the heating wire is arranged outside the outer shell and connected to the control terminal of the vehicle, and the power supply of the heating wire is a power battery;

[0051] The top of the side wall of the outer shell is provided with a ventilation pipeline connected to its internal chamber, the pipeline is provided with a ventilation axial flow fan, and a one-way check valve and a float plunger valve are provided at the outlet of the ventilation axial flow fan;

[0052] The above-mentioned float plunger valve includes:

[0053] The valve body is a square steel tube, a rubber cylindrical plug, a spring, a spring buckle, a pull rod, a flexible steel wire rope, a bracket, a float connecting rod and a float;

[0054] The spring is set inside the valve body, and the rubber cylindrical plug is set above the spring. The upper side wall of the valve body is provided with a lock hole for the front end of the spring clip to be embedded. The lock hole is connected to the spring installation position inside the valve body. The front end of the spring clip is embedded in the lock hole and pressed on the top of the spring to keep the spring in a compressed state.

[0055] The pull rod is an L-shaped rod, and the angle between the vertical rod portion and the horizontal rod portion is greater than or equal to 100° and less than or equal to 110°;

[0056] The lower part of the front end of the spring clip is hinged to the top of the clip support on the outer wall of the valve body, the lower end surface of the rear end of the spring clip is provided with an arc-shaped groove, the outer wall of the valve body is provided with a connecting rod support, the corner part of the pull rod is hinged to the top of the connecting rod support, and the front end of the pull rod is provided with a protrusion that contacts the upper end surface of the connecting rod support, which prevents the pull rod from flipping toward the valve body side;

[0057] The pull rod head is a ball head and is embedded in the arc groove. The pull rod head is completely embedded in the arc groove of the spring buckle, which is the initial state of the spring buckle. In this state, the spring buckle is in a compressed spring state.

[0058] The other end of the pull rod is connected to the flexible steel wire rope, and the other end of the flexible steel wire rope passes through four steel wire ropes I. The other end of each steel wire rope I is connected to a float connecting rod, and a float is provided at the end of the float connecting rod. The front end of the float connecting rod is hinged to the bracket, and the bracket is rigidly connected to the vehicle chassis.

[0059] Further,

[0060] The reel support is a tubular structure with an axis passing through it, and is radially processed with a number of circular through holes.

[0061] Further,

[0062] A contact switch is provided at the opening of the rigid pipe mouth which is sealed by the rubber cylindrical plug of the float plunger valve, and the switch is connected to the main power switch.

[0063] Further,

[0064] Also includes: air conditioning refrigeration unit and heat exchange refrigeration seat;

[0065] The cold air outlet pipe of the above-mentioned air conditioning and refrigeration device is connected to two sets of headers through a tee;

[0066] The heat exchange refrigeration seat is provided with a plurality of through holes, and the branch pipes of the two sets of headers are respectively connected to the openings at both ends of the through holes;

[0067] The lower end surface of the heat exchange refrigeration seat is processed with a plurality of arc grooves that are staggered horizontally and vertically and connected, and the bottom of the arc groove 204 is processed with a plurality of vertical holes that are connected to the through hole.

[0068] When the present invention adopts the above technical solution, it:

[0069] When cooling is required, the valve on the pipeline where the heating axial flow fan is located is closed, the heating axial flow fan does not work, and the heating wire is not energized;

[0070] When the cooling axial flow fan is turned on, it draws external air into the outer shell, and injects the air into the corresponding strip holes on the lower end face of the battery support seat and the upper end face of the heat exchange base through the cooling manifold and the heating manifold, which are interlocked with each other to form a horizontal through-hole. The air is then introduced into the horizontally and vertically staggered and connected strip grooves on the upper end face of the battery support seat through the vertical holes connected to the through-holes. The vertical holes are used to directly blow air to cool the battery, and the other openings are responsible for diffusing the cold air into the entire outer shell. At the same time, the ventilation axial flow fan of the ventilation pipeline works to extract the hot air out; the air cooling cycle is automatically and continuously performed to keep the power battery under safe temperature conditions at all times.

[0071] It depends on whether to install the air conditioning refrigeration device and the heat exchange refrigeration seat. Due to the high cost and high power consumption of air conditioning refrigeration, it is not necessary to install it if the demand is not high.

[0072] When the air conditioning refrigeration device is selected, the air conditioning refrigeration device can be started alone to assist in cooling, which can achieve rapid cooling of the battery.

[0073] When heating is required,

[0074] All valves in the pipeline where the refrigeration axial flow fan is located are closed, the refrigeration axial flow fan does not work, and if there is an air conditioning refrigeration device, it will not be started; all valves in the ventilation pipeline are closed.

[0075] The heating wire is energized and its heating power is controlled by the control device. All valves in the pipeline where the heating axial flow fan is located are opened, and the heating axial flow fan starts to absorb the gas inside the outer shell. The heating axial flow fan 105 is also transported to the through holes of the battery support seat and the heat exchange base through the refrigeration header and the heating header. Since the through holes are equipped with heating wire reels, the power of the heating wire heats the gas flowing through, and then the hot gas is blown out through the same structure, thereby achieving heating; the heating control is a combination of automatic control and manual control to ensure the best working state of the power battery.

[0076] Working principle of float plunger valve:

[0077] When the vehicle rolls over or flips in any direction, regardless of whether it touches water or not, the float drives the float connecting rod to swing, and then pulls the four steel wire ropes I to pull the flexible steel wire rope. The flexible steel wire rope pulls the tail end of the pull rod, causing the pull rod to rotate outward, and then the ball head part of the pull rod head embedded in the arc-shaped groove at the lower end of the rear end of the spring clip is disengaged from the arc-shaped groove, and then the spring clip loses its rotation resistance, and the spring elastic resets to bounce the front end of the spring clip open, and the top of the spring pops out the rubber cylindrical plug, and after the rubber cylindrical plug is extended, it engages and seals with the external sealing part to achieve a one-time sealing.

[0078] The float plunger valve body and the rigid pipe mouth are matched and rigidly connected to the vehicle chassis.

[0079] Among them, the strength requirement of the outer shell is to withstand more than tons of impact, and at the same time have waterproof sealing and heat preservation functions.

[0080] Among them, air filters are provided on all intake and exhaust pipes of the present application.

[0081] Among them, all pipes connected to the axial flow fan are rubber hoses.

[0082] Compared with the prior art, the present invention has the following advantages:

[0083] 1. Practicality and reliability based on actual application: low cost, simple structure, easy to develop and utilize, and can effectively prevent the impact of changes in external ambient temperature on the battery, ensuring the safe use of the battery and effectively guaranteeing the battery's endurance.

[0084] Under the conditions of meeting the safety operating requirements, when the energy intensity of the power battery reaches the standard value, it will not spontaneously combust or explode, that is, it is not afraid of high temperatures in hot seasons and low temperatures in cold seasons.

[0085] At the same time, the device is automatically waterproof in the face of various floods.

[0086] 2. It can automatically realize the required cooling, heating and waterproofing when driving, parking or charging, ensuring the safety of various vehicles and mechanical equipment using power batteries and giving full play to the high performance of power batteries.

[0087] In order to ensure the safe temperature state of the power battery, the refrigeration device works automatically all the time.

[0088] The heating adopts both automatic and manual control modes, which allows you to make an appointment for heating before traveling. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0090] Figure 1 It is a schematic diagram of the overall structural layout of the present invention.

[0091] Figure 2 This is a schematic diagram of the assembly relationship between the heat exchange base, battery support base and heating wire reel of the present invention.

[0092] Figure 3 It is a schematic diagram of the overall structure of the float plunger valve of the present invention.

[0093] Figure 4 It is a top view schematic diagram of the spring buckle assembly position of the float plunger valve of the present invention.

[0094] Figure 5 This is a schematic diagram of the heating wire reel structure of the present invention.

[0095] In the picture:

[0096] A. Integrated cooling and heating temperature control device;

[0097] 1. Outer shell;

[0098] 100, heat exchange base; 101, battery support base; 102, cooling manifold; 103, heating manifold; 104, cooling axial flow fan; 105, heating axial flow fan; 106, heating wire reel; 107, through hole; 108, heating wire; 109, reel bracket; 110, spacer block; 111, strip groove; 112, vertical hole; 113, ventilation pipe; 114, ventilation axial flow fan; 115, Float plunger valve; 116, one-way check valve; 117, valve body; 118, rubber cylindrical plug; 119, spring; 120, spring clip; 121, pull rod; 122, flexible wire rope; 123, bracket; 124, float connecting rod; 125, float; 126, lock; 127, clip support; 128, connecting rod support; 130, wire rope I; 131, rigid nozzle; 132, air filter;

[0099] 200. Air conditioning and refrigeration unit; 201. Heat exchange refrigeration seat; 202. Tee; 203. Header; 204. Arc groove. DETAILED DESCRIPTION

[0100] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0101] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0102] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0103] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0104] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0105] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "above" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0106] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0107] like Figures 1 to 5As shown, the present invention provides an external heating and cooling device for a power battery pack, comprising:

[0108] An outer shell 1 with a accommodating chamber whose top can be opened and closed, and a cooling and heating integrated temperature control device A arranged inside the outer shell 1 below the power battery;

[0109] The above-mentioned integrated cooling and heating temperature control device A includes:

[0110] A heat exchange base 100 is mounted on the bottom of the internal chamber of the outer shell 1, a battery support base 101 is mounted on the top of the heat exchange base 100 and contacts the lower end of the power battery, a cooling manifold 102, a heating manifold 103, a cooling axial flow fan 104, a heating axial flow fan 105, a plurality of heating wire reels 106 and a plurality of float plunger valves 115;

[0111] The cooling axial flow fan 104 and the heating axial flow fan 105 both have two outlet pipes, one of which is connected to the inlet of the cooling header 102 via a tee, and the other is connected to the inlet of the heating header 103 via a tee.

[0112] Each three-way inlet is provided with a one-way check valve 116;

[0113] The upper end surface of the heat exchange base 100 is machined with a plurality of semicircular strip holes extending transversely therethrough. The lower end surface of the battery support base 101 is machined with strip holes corresponding to the strip holes on the upper end surface of the heat exchange base 100. When the lower end surface of the battery support base 101 is engaged with the upper end surface of the heat exchange base 100, the corresponding strip holes interlock with each other to form a transverse through hole 107.

[0114] Each through hole 107 is embedded with a heating wire reel 106;

[0115] The heating wire reel 106 comprises: a heating wire 108 and a reel support 109;

[0116] The heating wire 108 is wound around the outer wall of the reel support 109 to form a heating wire reel 106. The outer wall of the reel support 109 is provided with a plurality of spacer blocks 110 for separating adjacent wound heating wires 108.

[0117] The reel holder 109, heat exchange base 100 and battery support base 101 are made of high-strength aluminum alloy;

[0118] The upper end surface of the battery support 101 that contacts the battery is processed with a plurality of strip grooves 111 that are interlaced and connected horizontally and vertically, and each groove parallel to the through hole 107 is processed with a plurality of vertical holes 112 that are connected to the corresponding through hole 107;

[0119] The number of branch pipes of the cooling header 102 is the same as the number of through holes 107 and is connected to one end opening of the through holes 107. The number of branch pipes of the heating header 103 is the same as the number of through holes 107 and is connected to the other end opening of the through holes 107.

[0120] The air inlet of the heating axial flow fan 105 is located inside the outer shell 1 and is provided with a one-way check valve 116;

[0121] The air inlet of the refrigeration axial flow fan 104 is placed outside the outer shell 1 and is provided with a one-way check valve and a float plunger valve 115;

[0122] The control device for the power-on state of the heating wire 108 is arranged outside the outer shell 1 and connected to the control terminal of the vehicle. The power supply of the heating wire 108 is a power battery;

[0123] The top of the side wall of the outer shell 1 is provided with a ventilation pipeline 113 communicating with the internal chamber thereof, the pipeline is provided with a ventilation axial flow fan 114, and a one-way check valve and a float plunger valve 115 are provided at the outlet of the ventilation axial flow fan 114;

[0124] The above-mentioned float plunger valve 115 includes:

[0125] The valve body 117 is a square steel tube, a rubber cylindrical plug 118, a spring 119, a spring buckle 120, a pull rod 121, a flexible steel wire rope 122, a bracket 123, a float connecting rod 124 and a float 125;

[0126] The spring 119 is arranged inside the valve body 117, and the rubber cylindrical plug 118 is arranged above the spring 119. The upper side wall of the valve body 117 is provided with a lock hole 126 for the front end of the spring clip 120 to be embedded. The lock hole 126 is connected to the installation position of the spring 119 inside the valve body 117. The front end of the spring clip 120 is embedded in the lock hole 126 and pressed on the top of the spring 119 to keep the spring in a compressed state.

[0127] The pull rod 121 is an L-shaped rod, and the included angle between the vertical rod portion and the horizontal rod portion is greater than or equal to 100° and less than or equal to 110°;

[0128] The lower front end of the spring clip 120 is hinged to the top of the clip support 127 on the outer wall of the valve body 117. The lower end surface of the rear end of the spring clip 120 is provided with an arc-shaped groove. The outer wall of the valve body 117 is provided with a connecting rod support 128. The corner part of the pull rod 121 is hinged to the top of the connecting rod support 128. The front end of the pull rod 121 is provided with a protrusion that contacts the upper end surface of the connecting rod support 128. The protrusion prevents the pull rod 121 from flipping toward the valve body 117.

[0129] The head of the pull rod 121 is a ball head and is embedded in the arc groove. The head of the pull rod 121 is completely embedded in the arc groove of the spring buckle 120, which is the initial state of the spring buckle 120. In this state, the spring buckle 120 is in a compressed spring 119 state.

[0130] The other end of the pull rod 121 is connected to the flexible steel wire rope 122, and the other end of the flexible steel wire rope 122 passes through four steel wire ropes Ⅰ130. The other end of each steel wire rope Ⅰ130 is connected to a float connecting rod 124, and a float 125 is provided at the end of the float connecting rod 124. The front end of the float connecting rod 124 is hinged to the bracket 123, and the bracket 123 is rigidly connected to the vehicle chassis.

[0131] Further,

[0132] The reel support 109 is a tubular structure with an axis passing through it, and is provided with a plurality of circular through holes in the radial direction.

[0133] Further,

[0134] A contact switch is provided at the opening of the rigid pipe mouth 131 which is sealed with the rubber cylindrical plug 118 of the float plunger valve 115 , and the switch is connected to the main power switch.

[0135] Further,

[0136] It also includes: an air conditioning refrigeration device 200 and a heat exchange refrigeration seat 201;

[0137] The cold air outlet pipe of the air conditioning and refrigeration device 200 is connected to two sets of headers 203 through a tee 202;

[0138] The heat exchange refrigeration seat 201 is provided with a plurality of through holes, and the branch pipes of the two sets of headers 203 are respectively connected to the openings at both ends of the through holes;

[0139] The lower end surface of the heat exchange refrigeration seat 201 is processed with a plurality of arc-shaped grooves 204 that are staggered horizontally and vertically and connected, and a plurality of vertical holes that are connected to the through hole are processed at the bottom of the arc-shaped grooves 204.

[0140] When the present invention adopts the above technical solution, it:

[0141] When cooling is required, the valve on the pipeline where the heating axial flow fan is located is closed, the heating axial flow fan does not work, and the heating wire is not energized;

[0142] The cooling axial flow fan is turned on to suck external air into the outer shell, and the air is injected into the lower end face of the battery support seat 101 and the upper end face of the heat exchange base 100 through the cooling manifold and the heating manifold 103. The corresponding strip holes are interlocked with each other to form a horizontal through-hole 107, and the air is introduced into the horizontally and vertically staggered and connected strip grooves 111 on the upper end face of the battery support seat 101 through the vertical holes connected to the through-hole 107. The vertical holes realize direct blowing and cooling of the batteries, and the other openings are responsible for diffusing the cold air to the entire outer shell. At the same time, the ventilation axial flow fan 114 of the ventilation pipe 113 works to extract the hot air for discharge.

[0143] It depends on whether to install the air conditioning refrigeration device and the heat exchange refrigeration seat. Due to the high cost and high power consumption of air conditioning refrigeration, it is not necessary to install it if the demand is not high.

[0144] When the air-conditioning and refrigeration device is selected, the air-conditioning and refrigeration device 200 can be started alone to assist in cooling, thereby achieving rapid cooling of the battery.

[0145] When heating is required,

[0146] All valves of the pipeline where the refrigeration axial flow fan 104 is located are closed, the refrigeration axial flow fan 104 does not work, and if there is an air conditioning refrigeration device, it will not be started; all valves of the ventilation pipeline 113 are closed.

[0147] The heating wire 108 is energized and its heating power is controlled by the control device. All valves in the pipeline where the heating axial flow fan 105 is located are opened, and the heating axial flow fan 105 starts to absorb the gas inside the outer shell. The heating axial flow fan 105 also transports the gas to the through hole 107 of the battery support seat 101 and the heat exchange base 100 through the refrigeration header and the heating header 103. Since the through hole 107 is equipped with a heating wire reel 106, the power of the heating wire 108 heats the gas flowing through it, and then the hot air is blown out through the same structure, thereby achieving heating.

[0148] Working principle of float plunger valve 115:

[0149] When the vehicle rolls over or flips in any direction, regardless of whether it touches water or not, the float 125 drives the float connecting rod 124 to swing, and then pulls the four steel wire ropes Ⅰ 130 to pull the flexible steel wire rope 122. The flexible steel wire rope 122 pulls the tail end of the pull rod 121, causing the pull rod 121 to rotate outward, and then the ball head part of the pull rod 121 embedded in the arc-shaped groove at the lower end of the rear end of the spring clip 120 is disengaged from the arc-shaped groove, and then the spring clip 120 loses its rotation resistance, and the spring 119 elastically resets to bounce the front end of the spring clip 120 open, and the top of the spring 119 pops out the rubber cylindrical plug 118. After the rubber cylindrical plug 118 is extended, it engages and seals with the external sealing part to achieve a one-time sealing.

[0150] The float plunger valve 115 body and the rigid pipe nozzle 131 are matched and rigidly connected to the vehicle chassis.

[0151] Among them, the strength requirement of the outer shell is to withstand an impact of more than 100 tons.

[0152] Among them, air filters 132 are provided on all the intake and exhaust pipes of the present application.

[0153] Among them, all pipes connected to the axial flow fan are rubber hoses.

[0154] Among them, this device is equipped with a sensor that monitors the surface temperature of the power battery in real time. It is set to automatically heat when the temperature is below 8 degrees Celsius and cool when the temperature is above 20 degrees Celsius. The switching between cooling and heating is achieved through an automatic temperature sensing switch, so that the power battery can always perform in the best working condition with the highest safety and efficiency.

[0155] Among them, all electrical connection line connectors are waterproof connectors.

[0156] Among them, all rubber pipes of the device are equipped with pipe clamps to tighten them.

[0157] The device is detachably assembled with the vehicle body to be powered, and a certain quick-release structure (such as quick bolts and bayonet assembly) is provided to achieve rapid disassembly and installation, thereby enabling the device to be taken out as a whole and charged separately externally. The replacement of the entire device takes very little time, eliminating the need for long-term charging.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An external heating and cooling device for a power battery pack, characterized in that: include: An outer shell (1) with a accommodating chamber whose top can be opened and closed, and a cooling and heating integrated temperature control device (A) arranged inside the outer shell (1) and below the power battery; The above-mentioned integrated cooling and heating temperature control device (A) includes: A heat exchange base (100) mounted on the bottom of the inner chamber of the outer shell (1), a battery support base (101) mounted on the top of the heat exchange base (100) and in contact with the lower end of the power battery, a cooling header (102), a heating header (103), a cooling axial flow fan (104), a heating axial flow fan (105), a plurality of heating wire reels (106) and a plurality of float plunger valves (115); The cooling axial flow fan (104) and the heating axial flow fan (105) both have two outlet pipes, and one outlet pipe is connected to the inlet of the cooling header (102) through a tee, and the other outlet pipe is connected to the inlet of the heating header (103) through a tee; Each three-way inlet is provided with a one-way check valve (116); The upper end surface of the heat exchange base (100) is processed with a plurality of transversely penetrating strip holes with a semicircular cross section, and the lower end surface of the battery support base (101) is processed with strip holes corresponding to the strip holes on the upper end surface of the heat exchange base (100). When the lower end surface of the battery support base (101) and the upper end surface of the heat exchange base (100) are engaged, the corresponding strip holes are interlocked to form a transversely penetrating through hole (107); Each through hole (107) is embedded with a heating wire reel (106); The above-mentioned heating wire reel (106) comprises: a heating wire (108) and a reel support (109); The heating wire (108) is curled and wound on the outer wall of the reel support (109) to form a heating wire reel (106), and a plurality of spacer blocks (110) are provided on the outer wall of the reel support (109) to separate adjacently wound heating wires (108); The reel support (109), the heat exchange base (100) and the battery support base (101) are made of high-strength aluminum alloy; The upper end surface of the battery support seat (101) in contact with the battery is processed with a plurality of strip grooves (111) that are staggered horizontally and vertically and are connected, and each groove parallel to the through hole (107) is processed with a plurality of vertical holes (112) that are connected with the corresponding through hole (107); The number of branch pipes of the cooling header (102) is the same as the number of through holes (107) and is connected to one end opening of the through holes (107); the number of branch pipes of the heating header (103) is the same as the number of through holes (107) and is connected to the other end opening of the through holes (107); The air inlet of the heating axial flow fan (105) is located inside the outer shell (1) and is provided with a one-way check valve (116); The air inlet of the refrigeration axial flow fan (104) is located outside the outer shell (1) and is provided with a one-way check valve and a float plunger valve (115); The control device for the power-on state of the heating wire (108) is arranged outside the outer shell (1) and connected to the control terminal of the vehicle, and the power supply of the heating wire (108) is a power battery; The top of the side wall of the outer shell (1) is provided with a ventilation pipeline (113) communicating with the internal chamber thereof, the pipeline is provided with a ventilation axial flow fan (114), and a one-way check valve and a float plunger valve (115) are provided at the outlet of the ventilation axial flow fan (114); The above-mentioned float plunger valve (115) comprises: The valve body (117) is a square steel tube, a rubber cylindrical plug (118), a spring (119), a spring buckle (120), a pull rod (121), a flexible steel wire rope (122), a bracket (123), a float connecting rod (124) and a float (125); The spring (119) is arranged inside the valve body (117), the rubber cylindrical plug (118) is arranged above the spring (119), and the upper side wall of the valve body (117) is provided with a lock hole (126) for the front end of the spring clip (120) to be embedded. The lock hole (126) is communicated with the installation position of the spring (119) inside the valve body (117), and the front end of the spring clip (120) is embedded in the lock hole (126) and pressed on the top of the spring (119) to keep the spring in a compressed state; The pull rod (121) is an L-shaped rod, and the included angle between the vertical rod portion and the horizontal rod portion is greater than or equal to 100° and less than or equal to 110°; The lower front end of the spring clip (120) is hinged to the top of the clip support (127) on the outer wall of the valve body (117), the lower end surface of the rear end of the spring clip (120) is provided with an arc groove, the outer wall of the valve body (117) is provided with a connecting rod support (128), the corner portion of the pull rod (121) is hinged to the top of the connecting rod support (128), and the front end of the pull rod (121) is provided with a protrusion that contacts the upper end surface of the connecting rod support (128), and the protrusion prevents the pull rod (121) from turning toward the valve body (117); The head of the pull rod (121) is a ball head and is embedded in the arc groove. The head of the pull rod (121) is completely embedded in the arc groove of the spring buckle (120), which is the initial state of the spring buckle (120). In this state, the spring buckle (120) is in a compressed spring (119) state. The other end of the pull rod (121) is connected to the flexible steel wire rope (122), and the other end of the flexible steel wire rope (122) passes through four steel wire ropes I (130). The other end of each steel wire rope I (130) is connected to a float connecting rod (124), and a float (125) is provided at the end of the float connecting rod (124). The front end of the float connecting rod (124) is hinged to the bracket (123), and the bracket (123) is rigidly connected to the vehicle chassis. Air filters (132) are provided on all intake and exhaust pipes.

2. The external heating and cooling device for a power battery pack according to claim 1, characterized in that: The reel support (109) is an axially through-tubular structure, and is radially machined with a plurality of circular through holes.

3. The external heating and cooling device for a power battery pack according to claim 1 or 2, characterized in that: A contact switch is provided at the opening of the rigid pipe mouth (131) which is sealed by the rubber cylindrical plug (118) of the float plunger valve (115), and the switch is connected to the main power switch.

4. The external heating and cooling device for a power battery pack according to claim 3, characterized in that: It also includes: an air conditioning refrigeration device (200) and a heat exchange refrigeration seat (201); The cold air outlet pipe of the air conditioning and refrigeration device (200) is connected to two sets of headers (203) via a tee (202); The heat exchange refrigeration seat (201) is provided with a plurality of through holes, and the branch pipes of the two sets of headers (203) are respectively connected to the openings at both ends of the through holes; The lower end surface of the heat exchange refrigeration seat (201) is processed with a plurality of arc-shaped grooves (204) that are staggered horizontally and vertically and connected to each other, and the bottom of the arc-shaped grooves (204) is processed with a plurality of vertical holes that are connected to the through hole.

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