CN218334008U - Heat dissipation casing and battery module - Google Patents

Abstract

Embodiments of the present application provide a heat dissipation housing and a battery module, which relate to the field of batteries. The heat dissipation housing includes a liquid cooling plate. Several heat insulating sheets are vertically arranged on the upper surface of the liquid cooling plate. Each heat insulating sheet includes a heat pipe and two stacked VC uniform temperature plates. Between the temperature plates, and form surface contact with two VC uniform temperature plates; the liquid cooling plate and all heat shields surround and form several cell limit slots for accommodating cells, and each cell limit slot It is surrounded by a liquid cold plate and two adjacent and face-to-face heat shields. The heat dissipation case in this embodiment can improve the heat dissipation efficiency of the battery cells, can better control the temperature of each battery cell, and increase the service life of the battery module.

Description

A cooling case and a battery module

technical field

The present application relates to the battery field, in particular, to a heat dissipation case and a battery module.

Background technique

At this stage, the safety of new energy vehicles is a pain point in the industry, mainly related to the thermal management performance of batteries. Among the current new energy vehicles, all new energy vehicles use a stamped liquid cooling plate solution based on the CTP (Cell To Pack, packed battery) structure of the power battery pack. This stamped liquid-cooled plate is integrally formed, with only the top plate and the bottom plate. The material is generally made of aluminum alloy, which has the advantages of high structural strength and high thermal management efficiency.

However, since the water-cooling structure and flow channel shape design of the conventional stamped liquid-cooled plate are fixed, it can only contact one surface of the battery cell (generally the bottom surface of the battery cell). The limited contact area leads to limited heat exchange capacity. When encountering harsh working conditions such as high-speed climbing and fast charging, it will cause a large temperature difference on the liquid cooling plate, which will directly affect the performance and safety of the battery cell, and aggravate the new battery life. The increase in energy consumption of energy vehicles will affect the power and cruising range of the vehicle, and it will not be able to meet the charging needs of 4C and above high-rate batteries.

Utility model content

The embodiments of the present application provide a heat dissipation case and a battery module, which can improve the heat dissipation efficiency of the battery cells, better control the temperature of each battery cell, and increase the service life of the battery module.

In the first aspect, the embodiment of the present application provides a heat dissipation housing, which includes a liquid cooling plate, and several heat insulating sheets are vertically arranged on the upper surface of the liquid cooling plate, and each heat insulating sheet includes a heat pipe and two stacking arrangements VC vapor chambers, heat pipes are arranged between the stacked VC vapor chambers, and form surface contact with two VC vapor chambers; the liquid cooling plate and all heat shields are surrounded to form several chambers for accommodating batteries Each cell limiting slot is surrounded by a liquid cooling plate and two adjacent and face-to-face heat shields.

In the above implementation process, the cooling liquid in the liquid cold plate flows rapidly, which can realize the cooling effect. The VC (Vapor Chamber) vapor chamber and the heat pipe in the heat shield are both a heat dissipation device. When the VC vapor chamber is heated, the condensate inside will volatilize and absorb heat. The heat pipe can make full use of the heat conduction principle and the rapid phase change medium heat transfer properties. The thermal insulation sheet formed by the cooperation of the VC vapor chamber and the heat pipe can not only achieve the effect of cooling, but also introduce heat into the liquid cold plate.

In the embodiment of the present application, when the heat dissipation shell is working, the battery cell can be placed in the battery cell limiting groove. At this time, the side and bottom surface of the battery cell and other larger surfaces will directly contact the cooling devices such as the heat shield and the liquid cooling plate. Contact, the cell limit slot can cool the cell well.

In a possible implementation manner, all heat insulating sheets are arranged in a row, and adjacent heat insulating sheets in the same row are arranged opposite to each other.

In the above implementation process, the heat insulating sheets are arranged in a row, which can make the distribution of the battery cell limiting slots more regular, and is beneficial to the integration of the battery cells.

In a possible implementation manner, all the heat insulating sheets in the same column are arranged equidistantly, and the adjacent cell limiting grooves are separated by the same heat insulating sheet.

In the above implementation process, the heat shields in the same column are equidistantly arranged, and the card slots on the same limit block can be used to clamp the heat shields between adjacent cell limit slots, so that It can lead to a more concentrated distribution of batteries, which is more conducive to the integration of batteries.

In a possible implementation, the upper surface of the liquid cooling plate is provided with a pair of limiting strips, the paired limiting strips are parallel to each other and the two ends are flush, and the opposite ends of each heat shield are inserted in the on the paired limit strips.

In the above implementation process, the limit bar can provide a mounting point for the heat shield to limit the movement of the heat shield, and the limit bar will not prevent the heat on the heat shield from being transferred to the liquid cooling plate.

In a possible implementation manner, a partial area of the upper surface of the limiting strip is recessed downward to form a card slot, and each heat insulating sheet is inserted into the limiting bar through the card slot.

In a possible implementation manner, opposite ends of the heat pipe extend outwards to form elongated extensions, and each extension extends downwards away from the side of the heat pipe to form a plug-in strip, and the plug-in strip is connected to the slot. Matching, each heat shield is inserted on the paired limit strips through the splicing strips.

In the above implementation process, the plug-in strip on the extension part of the heat pipe matches the slot, which can ensure that the plug-in strip is inserted into the slot, so that the heat shield can be fixed on the plug-in bar.

In a possible implementation manner, the VC vapor chamber is rectangular, and the heat pipe is flat.

In the above implementation process, the rectangular VC vapor chamber has the same shape as the mainstream battery, which can fit the battery better. The flat heat pipe is conducive to increasing the contact area with the VC vapor chamber and improving heat exchange efficiency.

In a possible implementation manner, the thickness of the VC vapor chamber is 0.25-0.5 mm.

In a possible implementation manner, an NTC temperature sensor for monitoring temperature is arranged inside each heat shield.

In the above implementation process, the NTC (Negative Temperature Coefficient, negative temperature coefficient) temperature sensor can monitor the temperature of the heat shield, which provides a data basis for the prediction of the thermal runaway of the battery cell.

In the second aspect, the embodiment of the present application provides a battery module, which includes several battery cells and the above-mentioned heat dissipation casing, the battery cells correspond to the battery cell limiting slots one by one, and each battery cell is inserted into the corresponding The battery cell is placed in the limiting groove, and the battery cell is in surface contact with two adjacent heat shields and the liquid cooling plate.

In the above implementation process, since the battery cells in the battery module are inserted one by one in the battery cell limiting groove, each battery cell can obtain a good cooling effect, and the battery module in the embodiment of the application The structure is simple and the integration is high, which not only facilitates installation, but also reduces the volume of the battery module.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings that need to be used in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, so It should not be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings according to these drawings without creative work.

FIG. 1 is a schematic structural diagram of a heat dissipation housing provided in an embodiment of the present application;

Fig. 2 is the schematic structural diagram of the heat insulating sheet provided by the embodiment of the present application;

Fig. 3 is a schematic structural diagram of a liquid-cooled plate provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a battery module provided in an embodiment of the present application.

Icons: 001-heat dissipation shell; 002-battery module; 100-liquid cold plate; 110-limiting bar; 111-card slot; 200-heat shield; Extension; 222-plug strip; 300-cell limit slot; 400-cell.

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer" etc. is based on the orientation or positional relationship shown in the drawings, or the The usual orientation or positional relationship of the application product when used is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore It should not be construed as a limitation of the application.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is absolutely level or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of this application, it should also be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

first embodiment

Please refer to FIG. 1 to FIG. 3 , a heat dissipation housing 001 provided in this embodiment includes a liquid cooling plate 100 and several heat insulating sheets 200 vertically arranged on the upper surface of the liquid cooling plate 100 ; the liquid cooling plate 100 will A plurality of battery cell limiting grooves 300 are formed with the heat insulating sheet 200 for accommodating the battery cell 400; each battery cell limiting groove 300 is composed of a liquid cooling plate 100 and two adjacent and face-to-face heat insulating sheets 200 It is formed around, so that when the cell limiting groove 300 accommodates the cell 400, there will be a liquid cooling plate 100 and two heat shields 200 in surface contact with the cell 400, which can reduce the heat in the indirect cooling system The contact resistance maximizes the cooling efficiency of the battery cell 400 . Wherein, "several heat insulating sheets 200" means that the number of heat insulating sheets 200 is not less than three, so as to accommodate multiple battery cells 400 .

The liquid cold plate 100 is a cooling device for cooling down, and it realizes the cooling function by circulating and flowing cooling liquid in the liquid flow channel to transfer excess heat away. The parameters and shape of the flow channel in the liquid cooling plate 100 can be optimized and arranged according to the actual situation, which is not limited in this application.

In addition, the opening mode of the water inlet and outlet of the liquid cooling plate 100 generally has a normal open mode and a Plus mode, etc. Since the cooling case 001 in the embodiment of the present application is mainly used in the power battery module, it can be combined with the actual driving For working conditions, such as high-speed climbing, high-power fast charging, etc., the opening degree of the water inlet and outlet pipes is adjusted appropriately according to the temperature of the battery, and the optimal heat pipe management control strategy is implemented, which is not limited in this application.

In this embodiment, the upper surface of the liquid cooling plate 100 is provided with a pair of limiting strips 110, the pair of limiting strips 110 are parallel to each other and the two ends are flush, providing installation sites for the heat insulating sheet 200, heat insulation The sheet 200 can be inserted on the limiting strips 110 arranged in pairs to be fixed on the liquid cooling plate 100 . At this time, the limiting bar 110 is also arranged in the form of a heat pipe 220 , which will not hinder the transfer of heat from the heat shield 200 to the liquid cooling plate 100 . In addition, in order to ensure that each piece of heat insulating sheet 200 can be fixed on the limit strip 110, as an example, the upper surface of the pair of limit strips 110 in this embodiment is also recessed downwards to form several snap-fit Each pair of slots 111 of the heat insulating sheet 200 is connected to a piece of the insulating sheet 200 .

In the embodiment of the present application, each heat insulating sheet 200 includes two stacked VC vapor chambers 210 and heat pipes 220. Both form surface contact.

Both the VC vapor chamber 210 and the heat pipe 220 are heat dissipation devices. When the VC vapor chamber 210 is heated, the internal condensate will volatilize and absorb heat. The heat pipe 220 can make full use of the heat conduction principle and the rapid heat transfer property of the phase change medium. The thermal insulation sheet 200 formed by the cooperation of the VC vapor chamber 210 and the heat pipe 220 can not only realize the cooling effect, but also introduce heat into the liquid cold plate 100. The heat pipe 220 in this embodiment is welded with the The VC vapor chamber 210 is fixed. In this embodiment, the material of the heat pipe 220 is usually copper, brass or copper alloy, and the thermal conductivity is in the range of 8000-20000W/(m·K), such as 9000W/(m·K), 11000W/(m·K), 15000W/(m·K), 19000W/(m·K). As an example, the material of the heat pipe 220 in this embodiment is copper alloy, and the thermal conductivity is 15000 W/(m·K). The thermal conductivity of VC vapor chamber 210 is usually 16000-24000W/(m·K), for example, it can be 18000W/(m·K), 19000W/(m·K), 21000W/(m·K), 23000W/ (m·K), the material is generally titanium alloy, and the thickness is generally between 0.25-0.5mm. For example, the thickness can be 0.3mm, 0.4mm, or 0.45mm. As an example, the thermal conductivity of the VC vapor chamber 210 in this embodiment is 20000 W/(m·K).

The arrangement of the heat insulating sheets 200 in this embodiment is as follows:

All the heat insulating sheets 200 are arranged in a row, and the adjacent heat insulating sheets 200 in the same row are arranged opposite to each other, so that the distribution of the cell limiting grooves 300 can be more regular, which is beneficial to the integration of the cell 400 . In addition, in this embodiment, all the heat insulating sheets 200 in the same column are equidistantly arranged, and the adjacent battery cell limiting grooves 300 are separated by the same piece of heat insulating sheet 200; thus, the same piece of heat insulating sheet 200 can participate in Two battery cell limiting grooves 300 are formed around, which can make the distribution of the battery cell limiting grooves 300 more concentrated, and is more conducive to the integration of the battery cells 400 .

Since the current common cell 400 is a square cell 400, in order to fit the cell 400 better, the VC vapor chamber 210 in this embodiment has a rectangular shape, in order to make the contact area between the heat pipe 220 and the VC vapor chamber 210 larger , the heat pipe 220 is generally flat. And as an example, in this implementation, the opposite ends of the heat pipe 220 will extend outwards to form elongated extensions 221 , and the side of each extension 221 away from the heat pipe 220 will extend downwards to form a plug strip 222 . The insertion strip 222 is matched with the card slot 111 , and each piece of heat insulation sheet 200 is inserted on the pair of limit strips 110 through the insertion strip 222 to fix the whole piece of heat insulation sheet 200 .

Of course, in some other embodiments, the limiting bar 110 can also be inserted into the slot 111 by means of structural heat-conducting glue or brazing, which will not be repeated in this application.

In addition, in this embodiment, an NTC temperature sensor (not shown in the figure) for monitoring temperature is provided inside each heat insulating sheet 200 to provide a data basis for predicting the thermal runaway of the battery cell 400 .

second embodiment

As shown in Figures 1 to 4, this embodiment provides a battery module 002, which includes a plurality of battery cells 400 and the heat dissipation case 001 in the first embodiment, the battery cells 400 and the battery cell limiting groove 300 In one-to-one correspondence, each battery cell 400 is inserted into the corresponding battery cell limiting groove 300 , and the battery cells 400 respectively form surface contact with two adjacent heat insulating sheets 200 and the liquid cooling plate 100 .

In addition, as an example, in this embodiment, the bottom surface of the battery cell 400 and the liquid cooling plate 100 are fixed by structural heat-conducting glue.

Since the battery cells 400 in this embodiment are inserted one by one in the battery cell limiting groove 300, and form surface contact with the bottom and side surfaces of the battery cell limiting groove 300, each battery cell 400 can be well Moreover, the battery module 002 in this embodiment has a simple structure and high integration, which is convenient for installation and can reduce the volume of the battery module 002.

Compared with the existing stamped cooling plate, the heat dissipation housing 001 in the first embodiment does not occupy additional space. Moreover, the battery module 002 of the first embodiment (that is, the battery module 002 in the second embodiment) is adopted, and its thermal conductivity is improved by several 10 times, which greatly ensures the uniformity of the temperature of each battery cell 400, The temperature difference of the battery cell 400 can be precisely controlled from the original 15°C to 5°C. Correspondingly, the life of the battery cell 400 is also extended by 10%, and the temperature control time of the battery cell 400 is shortened to 1/3 of the original.

The above are only examples of the present application, and are not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. A heat dissipation shell is characterized by comprising a liquid cooling plate, wherein a plurality of heat insulation sheets are vertically arranged on the upper surface of the liquid cooling plate, each heat insulation sheet comprises a heat pipe and two stacked VC temperature equalizing plates, and the heat pipe is arranged between the stacked VC temperature equalizing plates and is in surface contact with the two VC temperature equalizing plates; the liquid cooling board and all the heat insulating pieces enclose and establish the electric core spacing groove that forms a plurality of and be used for the holding electric core, every the electric core spacing groove by the liquid cooling board encloses with two adjacent and face-to-face heat insulating pieces that set up and establishes the formation.

2. The heat-dissipating housing of claim 1, wherein all of the heat-dissipating fins are arranged in a row, and adjacent heat-dissipating fins in the same row are disposed opposite to each other.

3. The heat dissipation housing of claim 2, wherein all the heat insulation sheets in a same column are arranged at equal intervals, and adjacent cell limiting grooves are separated by the same heat insulation sheet.

4. The heat dissipation shell as recited in claim 1 or 2, wherein the upper surface of the liquid cooling plate is provided with a pair of limiting strips, the pair of limiting strips are parallel to each other and have two flush ends, and the opposite ends of each heat insulation sheet are inserted into the pair of limiting strips.

5. The heat dissipation shell as claimed in claim 4, wherein a part of the upper surface of the limiting strip is recessed downward to form a slot, and each of the heat insulation sheets is inserted into the limiting strip through the slot.

6. The heat dissipation housing as claimed in claim 5, wherein the opposite ends of the heat pipe extend outward and form elongated extensions, each of the extensions extends downward away from the side of the heat pipe to form an insertion strip, the insertion strip is matched with the slot, and each of the heat insulation sheets is inserted into the paired limiting strips through the insertion strip.

7. The heat dissipation housing of claim 1, wherein the VC vapor chamber is rectangular and the heat pipe is flat.

8. The heat dissipation casing of claim 1, wherein the VC uniform temperature plate has a thickness of 0.25-0.5 mm.

9. The heat-dissipating housing of claim 1, wherein each of the heat-dissipating fins is internally provided with an NTC temperature sensor for monitoring temperature.

10. A battery module, comprising a plurality of battery cells and the heat dissipation housing of any one of claims 1 to 9, wherein the battery cells correspond to the battery cell limiting grooves one to one, each battery cell is inserted into the corresponding battery cell limiting groove, and the battery cells respectively form surface contact with the two adjacent heat insulation sheets and the liquid cooling plate.

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