CN210381349U

CN210381349U - Electric heater and power battery heating device comprising same

Info

Publication number: CN210381349U
Application number: CN201920724947.5U
Authority: CN
Inventors: 吴翔; 闻俊涛; 鄂新刚
Original assignee: SHENZHEN SHARING ELECTRONICS CO Ltd
Current assignee: SHENZHEN SHARING ELECTRONICS CO Ltd
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-04-21
Anticipated expiration: 2029-05-20

Abstract

The application relates to the technical field of power battery heating, in particular to an electric heater and a power battery heating device comprising the same. Electric heater includes the casing, inside heating chamber and the runner of being provided with of casing, the runner sets up the both sides in heating chamber, the heating intracavity is fixed with the heat-generating body, the heat-generating body is including generating heat layer and cladding generate heat the aluminum hull on layer, generate heat the layer with be provided with the first insulation layer between the aluminum hull. Can heat the liquid heat transfer medium who flows through the runner through the electric heater that this application provided, heat the battery through liquid heat transfer medium for replace the current mode of adopting electrical heating membrane or hot plate direct mount to heat on the battery surface, have the heat-conduction efficiency height, heat even effect.

Description

Electric heater and power battery heating device comprising same

Technical Field

The application relates to the technical field of power battery heating, in particular to an electric heater and a power battery heating device comprising the same.

Background

With the strong support of the national policy on the new energy industry, the power battery industry of electric vehicles is developing rapidly. The power battery of the electric automobile must work in a proper temperature range, when the temperature of the working environment where the battery is located is too low in cold winter, the charging and discharging performance of the battery is obviously attenuated, and even the battery cannot work normally, so that the battery can be normally used only by heating the battery to a certain temperature by a thermal management system.

The current heating mode of the power battery usually adopts a mode that an electric heating film or a heating plate is directly arranged on the surface of the battery for heating, the heating mode has low heating efficiency, and the temperature consistency among the batteries cannot be ensured.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems or at least partially solve the technical problems, the present application provides an electric heater and a power battery heating device including the same.

In a first aspect, embodiments of the present application provide an electric heater.

According to the electric heater that this application embodiment provided, it includes the casing, inside heating chamber and the runner of being provided with of casing, the runner sets up the both sides in heating chamber, the heating intracavity is fixed with the heat-generating body, the heat-generating body is including generating heat layer and cladding generate heat the aluminum hull on layer, generate heat the layer with be provided with the first insulation layer between the aluminum hull.

Further, the flow passages are symmetrically arranged on two sides of the heating cavity.

Furthermore, a plurality of flow passages are arranged on each side of the heating cavity, and two adjacent flow passages are separated by a separation rib.

Furthermore, a plurality of screw fastening feet are arranged on the edge of the shell.

Further, the screw fastening leg is formed by two synapses respectively disposed on the housing surface, with an opening formed therebetween.

Furthermore, the shell is made of aluminum.

Further, the heating element further comprises a second insulating layer covering the aluminum shell.

Furthermore, the first insulating layer or the second insulating layer is made of silica gel or ceramic.

Further, the heat generating layer includes a PTC thermistor element.

In a second aspect, the present application provides a power battery heating apparatus.

The power battery heating device provided according to the embodiment of the application comprises the electric heater provided by the embodiment of the application.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: can heat the liquid heat transfer medium who flows through the runner through the electric heater that this application provided, heat the battery through liquid heat transfer medium for replace the current mode of adopting electrical heating membrane or hot plate direct mount to heat on the battery surface, have the heat-conduction efficiency height, heat even effect.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

FIG. 1 is a reference diagram of a housing structure provided in an embodiment of the present application;

FIG. 2 is a reference diagram of another housing structure provided by an embodiment of the present application;

FIG. 3 is a structural reference view of a heat-generating body provided in an embodiment of the present application;

FIG. 4 is a partial enlarged view of portion A of FIG. 3;

FIG. 5 is a front view of an electric heater provided by an embodiment of the present application;

FIG. 6 is a side view of an electric heater provided by an embodiment of the present application;

FIG. 7 is a top view of an electric heater provided in an embodiment of the present application;

fig. 8 is a structural reference diagram of a heat generating layer according to an embodiment of the present application;

FIG. 9 is a sectional view taken along line A-A and a partial enlarged view of FIG. 8;

FIG. 10 is a structural reference view of another heat generating layer provided in the embodiments of the present application; and

FIG. 11 is a sectional view taken along line B-B of FIG. 10 and a partial enlarged view; and

fig. 12 is a structural reference diagram of a power battery heating device according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to the accompanying examples and figures 1-11.

As shown in fig. 1 to 7, the embodiment of the present application provides an electric heater, which includes a housing 1, a heating cavity 2 and a flow passage 3 are disposed inside the housing 1, the flow passage 3 is disposed at two sides of the heating cavity 2, a heating element 4 is fixed in the heating cavity 2, the heating element 4 includes a heating layer 401 and an aluminum shell 402 covering the heating layer 401, and a first insulating layer 403 is disposed between the heating layer 401 and the aluminum shell 402. When the power battery needs to be heated in a low-temperature environment, a cooling medium can be sent into the flow channel 3 through the pump body and then sent into the liquid cooling plate of the power battery pack after being heated by the heating body 4 in the heating chamber 2, so that the temperature of the liquid cooling plate of the power battery pack is increased, and then the power battery is heated by the liquid cooling plate of the power battery pack, so that the power battery is kept in a safe temperature range, and the working performance of the power battery is improved. The runner 3 sets up in the both sides of heating chamber 2, the temperature that can 4 both sides of make full use of heat-generating body distribute, carry out the equalizing heating for the coolant that flows in the runner 3 from both sides, the mode of adopting electric heating membrane or hot plate direct mount to heat in the battery surface among the prior art adopts the problem that the heating efficiency is low that single face heat transfer caused has been avoided, in addition through the even flow of coolant liquid in liquid pipeline, realized being heated evenly, can guarantee the uniformity of temperature between each battery. The layer 401 that generates heat in the heat-generating body 4 is used for turning into heat energy with the electric energy, preferably adopts the electric heating element of resistance heating principle, and the cladding has the effect of the inside layer 401 that generates heat of protection on the one hand at the outer aluminium hull 402 of layer 401 that generates heat, has certain intensity, plays bearing and impact resistance function, and on the other hand, aluminium hull 402 is hot good conductor, can make the even outwards giving off of heat that generates heat layer 401 produced, further improves the radiating homogeneity of heat-generating body 4. Because the layer 401 that generates heat is the electrified component, the first insulating layer 403 that sets up between layer 401 and the aluminum hull 402 that generates heat can be used for making layer 401 and the aluminum hull 402 that generate heat insulating each other, guarantees the security of work.

In some embodiments, as shown in fig. 1 and 2, the flow channels 3 are symmetrically arranged on two sides of the heating chamber 2, and the symmetrical arrangement can further improve the uniformity of heating of the cooling medium in the flow channels 3 on two sides of the heating body 4.

The number of the flow channels 3 on both sides of the heating cavity 2 may be one or more, and particularly, the flow channels 3 are preferably arranged according to the size of the electric heater, when the size of the electric heater is larger, so as to improve the convection effect of the cooling medium in each flow channel and maintain the uniformity of the temperature of the fluid. Optionally, as shown in fig. 2, two flow passages 3 are respectively disposed at two sides of the heating cavity 2; optionally, as shown in fig. 1, a plurality of flow passages are provided at each side of the heating cavity 3, and two adjacent flow passages 3 are separated by a separation rib 5.

In some embodiments, as shown in fig. 1, 2, 5-7, the edge of the housing 1 is provided with a plurality of screw fastening legs 6, and the screw fastening legs 6 can be used for fixedly mounting the electric heater. Preferably, as shown in fig. 2, the screw fastening pin 6 is formed by two synapses 601 respectively disposed on the surface of the housing 1, with an opening 602 formed between the synapses 601. The screw fastening foot 6 with the opening 602 can be used for fixing and installing a threaded sleeve, and can also be used for installing other rod-shaped or shaft-shaped fixing pieces, for example, in the process of fixing the electric heater, the rod-shaped or shaft-shaped fixing pieces can be clamped into fixing holes formed in the screw fastening foot 6 from the opening in the radial direction, and a relatively slender fixing piece does not need to be inserted into the fixing holes in the axial direction, so that the installation process is more convenient and faster.

Preferably, the housing 1 is made of an aluminum-based material, such as aluminum or an aluminum alloy, and has a high thermal conductivity, which is beneficial for heat dissipation. The cooling medium used in the using process can be various liquid cooling media or phase change materials in the prior art, in this embodiment, a 50% glycol aqueous solution is preferably used as the heat conducting medium, the freezing point of the water conducting medium is lower and is-35 ℃, and the liquid solidification can be prevented.

In some embodiments, as shown in fig. 3 and 4, the heat generating body 4 further includes a second insulating layer 404 covering the aluminum case 402, and an inner-outer double-layer insulating structure, so that safety and reliability are higher, and when one of the first insulating layer 403 and the second insulating layer 404 is broken or damaged, insulation between the heat generating layer 401 and the case 1 can still be maintained through the other insulating layer. Preferably, the first insulating layer 403 or the second insulating layer 404 is made of silica gel or ceramic, and may be made of other insulating coatings, acetate cloth, PI, cloth, or plastic films.

In some embodiments, the heat generating layer 401 includes, but is not limited to, a constant resistance heating film, a PTC thermistor element, a constant resistance heating plate, and the like.

Because the constant resistance heating film often can cause the high temperature because of thermal accumulation and the poor reason of radiating effect, the electric heating film product continues work under this condition can lead to product temperature further to improve, can't realize automatic temperature control, has the thermal runaway risk in the use. In order to solve this problem, the present application provides certain improvements to a constant resistance heating film as a heat generating layer.

As shown in fig. 8 and 9, the heat generating layer 401 provided in the embodiment of the present application includes a first electrode 4011, a constant resistance heating film 4012, a second electrode 4013, and a PTC thermistor film 4014, two opposite side edges of the constant resistance heating film 4012 are respectively connected to the first electrode 4011 and the second electrode 4013, the PTC thermistor film 4014 is disposed between the first electrode 4011 and the second electrode 4012, and the first electrode 4011, the constant resistance heating film 4012, the PTC thermistor film 4014, and the second electrode 4013 are disposed in series. Wherein the first electrode 4011 and the second electrode 4013 are used for connection with a power source, so that the power source, the first electrode 4011, the constant-resistance heating film 4012, the second electrode 4013, and the 401PTC thermistor film 4014 constitute a series circuit. In a specific working process, after the constant resistance heating film 4012 is electrified, current passes through the constant resistance heating film 4012, electric energy is converted into heat energy to provide heat, and the PTC thermosensitive resistance film 4014 is in a low resistance state within a normal working temperature range, so that the heating function of the whole heating layer 401 is not influenced; when the heating layer 401 exceeds a certain temperature, the resistance of the PTC thermistor 4014 changes suddenly, the resistance value is increased rapidly, the resistance of the whole electric heating film series circuit is increased to several times to several tens times of the original resistance, the heating power is reduced rapidly, and the effective control of the temperature of the heating layer 401 is realized. In the embodiment, the PTC thermistor film 4014 is serially arranged in the loop of the heating layer 401, so that the heating layer 401 realizes the automatic temperature control function, the problem of thermal runaway in use is effectively avoided, and the safety is high.

In the above-described embodiment, the PTC thermistor film 4014 is provided between the first electrode 1 and the second electrode 4012, and its positional relationship with the constant-resistance heating film 4012 may be in many cases. Preferably, as shown in fig. 8, the PTC thermistor film 4014 is provided inside the constant resistance heating film 4012 to divide the constant resistance heating film 4012 into a first constant resistance heating film and a second constant resistance heating film, and opposite side edges of the PTC thermistor film 4014 are connected to the first constant resistance heating film and the second constant resistance heating film, respectively. The temperature of the PTC thermistor film 4014 can be sensed earlier by the PTC thermistor film 4014 through the arrangement, so that the rapid response is realized, the resistance value change is generated according to the self temperature, the temperature control function is realized, and the thermal runaway is prevented.

In some embodiments, as shown in fig. 10 and 11, a plurality of groups of the constant resistance heating film 4012 and the PTC thermistor film 4014 are arranged in parallel between the first electrode 4011 and the second electrode 4013, each group of the constant resistance heating film 4012 and the PTC thermistor film 4014 constitutes a heating tape, and an empty region 4015 is formed between two adjacent groups of the heating tape at an interval. Each group of heating belts arranged in parallel divides the electric heating film into a plurality of heating areas, in the specific working process, after the electric heating belt is electrified, current passes through each group of heating belts, electric energy is converted into heat energy to provide heat, and in the normal working temperature range, the PTC thermosensitive resistance film 4014 in each heating belt is in a low resistance state, so that the heating function is not influenced; when a certain heating zone exceeds a certain temperature, the PTC thermistor film 4014 in the heating zone senses that the resistance changes after the temperature changes, the resistance value is increased rapidly, the resistance value of the heating zone is increased to several times to several tens times of the original resistance value, the heating power is reduced rapidly, the effective control of the zone temperature of the heating zone is realized, because the heating zones are arranged in parallel, the resistance value change of the heating zone does not affect other heating zones, the temperature control of different heating zones is realized, the thermal runaway problem of a part of the heating zones in use is effectively avoided, and the control is more refined.

Preferably, the constant-resistance heating film 4012 uses carbon nanotubes, graphene, or the like as a base material.

As shown in fig. 6-8, the first electrode 1 and the second electrode 3 are respectively connected with an electrode lead 7, and the electrode leads are used for being connected with the positive electrode and the negative electrode of a power supply or being connected with the live wire and the zero line respectively.

In the above embodiment, the resistance density of the constant-resistance heating film 4012 is preferably 0.1 ohm/cm to 10 ohm/cm; the first electrode 4011 and the second electrode 4013 are made of stainless steel, aluminum, brass, copper-nickel alloy, copper or other alloys, preferably copper foil; for another example, the thickness of the constant resistance heating film 4012 and the PTC thermistor film 4014 is 0.03 to 0.3mm, preferably 0.05 mm; the selection of the PTC thermistor membrane 4014 can be adjusted according to specific temperature control requirements, in principle, the maximum temperature to be controlled is equivalent to the curie temperature of the PTC thermistor membrane 4014, and the curie temperature of the PTC thermistor membrane 4014 is preferably 50-200 ℃.

In addition, as shown in fig. 12, an embodiment of the present application further discloses a power battery heating device, which includes an electric heater, a pump body, a medium box, a liquid cooling plate, and a power battery pack, wherein the electric heater, the pump body, the medium box, and the liquid cooling plate are sequentially connected through a pipeline to form a battery heating circulation system, the liquid cooling plate is fixed on the power battery pack, and a circulation direction of a medium in a heating process of the power battery pack is as follows: medium box-pump body-electric heater-liquid cooling plate-medium box. The electric heater is provided by the embodiment of the application. When the power battery pack needs to be heated in a low-temperature environment, the pump body extracts a medium from the medium box, the medium is heated by the electric heater and then is sent into the liquid cooling plate, so that the temperature of the liquid cooling plate is increased, and the power battery pack is heated by the liquid cooling plate, so that the working performance of the power battery is improved. Because the electric heater is the electric heater provided by the above embodiments of the present invention. Therefore, the power battery heating device with the electric heater also has all the technical effects, and the detailed description is omitted.

Other constructions and operations of the electric heater and the power cell heating device according to the above embodiments are known to those skilled in the art and will not be described in detail herein.

Some embodiments in this specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The foregoing is merely a detailed description of the invention that enables those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an electric heater, includes casing (1), its characterized in that, casing (1) is inside to be provided with heating chamber (2) and runner (3), runner (3) set up the both sides of heating chamber (2), heating chamber (2) internal fixation has heat-generating body (4), heat-generating body (4) are including generating heat layer (401) and cladding generate heat aluminum hull (402) of layer (401), generate heat layer (401) with be provided with first insulation layer (403) between aluminum hull (402).

2. An electric heater according to claim 1, characterised in that the flow paths (3) are symmetrically arranged on both sides of the heating chamber (2).

3. An electric heater according to claim 1, characterized in that a plurality of flow channels are provided on each side of the heating chamber (2), and adjacent two flow channels (3) are separated by a separation rib (5).

4. An electric heater according to claim 1, characterised in that the edge of the housing (1) is provided with a plurality of screw fastening feet (6).

5. The electric heater according to claim 4, characterized in that the screw fastening foot (6) is formed by two synapses (601) respectively arranged at the surface of the housing (1), an opening (602) being formed between the synapses (601).

6. An electric heater as claimed in claim 1, characterised in that the material of the housing (1) is aluminium.

7. The electric heater according to claim 1, wherein the heat-generating body (4) further comprises a second insulating layer (404) covering the aluminum case (402).

8. The electric heater according to claim 1, wherein the first insulating layer (403) or the second insulating layer (404) is made of silicon gel or ceramic.

9. An electric heater according to any of claims 1-8, wherein the heat generating layer (401) comprises PTC thermistor elements.

10. A power battery heating apparatus comprising an electric heater according to any one of claims 1 to 9.