CN201936970U - Power battery module - Google Patents

Abstract

The utility model provides a power battery module, comprising: a lower cover, an upper cover, a front cover and a rear cover, the lower cover includes a cooling plate, and several separators arranged on the cooling plate, adjacent to each other A space is formed between the two partitions; the upper cover is sealed and connected above the several partitions, the front cover is sealed and connected to the front side of the several partitions, and the rear cover It is sealed and connected to the rear side of the plurality of partitions; the cooling plate, upper cover, front cover, and rear cover are sealed and connected with the plurality of partitions to form several sealed spaces, and the sealed spaces contain There is a pole core and an electrolyte; the upper cover and the cooling plate are respectively provided with a main flow channel, and the separator is provided with a flow channel, and the flow channel is connected with the main flow channel in the upper cover and the cooling plate. The power battery module of the utility model can effectively cool or heat the pole core and electrolyte in each sealed space, and keep the temperature in good consistency.

Description

A power battery module

technical field

The utility model belongs to the protection field of power batteries. Specifically, the utility model relates to a power battery module and a battery thermal management system, especially a power battery module with good protection function and uniform heat transfer function and a battery thermal management system including the power battery module.

Background technique

In recent years, due to the pressure of energy costs and the increasing emphasis on environmental protection by the government and consumers, hybrid vehicles and electric vehicles have attracted the attention of many vehicle manufacturers due to their advantages of greatly reducing or eliminating exhaust emissions and reducing energy consumption. And have invested in research and development and promotion.

As an energy storage device, the power battery module is a core component in hybrid vehicles and electric vehicles. When the vehicle is running, the working current is relatively large, which often leads to the temperature of the single battery being too high. The operating temperature of the single battery directly affects the performance of the single battery. Generally speaking, when the single battery is too cold, the charge and discharge capacity of the single battery will decrease; when the single battery is overheated, the cycle life of the single battery will be reduced. . At the same time, a single battery is composed of several single batteries connected in series and parallel. If the temperature between the single batteries is uneven, the performance of the single battery will also decrease or fail, which will cause the performance of the entire power battery module to decline. or fail. For the consistency of the performance of the single battery, replacing the entire power battery module because of a single battery will lead to a significant increase in maintenance costs. This requires controlling the temperature of the single cells within an appropriate range, and the temperature between the single cells needs to maintain a good consistency.

At present, automobile manufacturers mainly use air heat exchange for thermal management of power batteries, but the heat transfer efficiency of air is low, the temperature difference between inlet and outlet is large, and the heat that low-flow gas can take out in a short period of time is very limited, and it is difficult to digest the high-current charging and discharging of batteries. The heat generated, the temperature difference between the battery cells near the air inlet and the battery cells near the air outlet is large, and the cooling effect on the single cells is unbalanced; if the wind speed is increased, it will lead to increased noise and energy consumption , and higher air duct sealing requirements. Another technical solution is to use the phase change latent heat of the phase change material to absorb the heat of the battery, which can only slow down the temperature rise of the battery, but cannot control the continuous temperature rise of the battery under long-distance working conditions; and when the phase change material absorbs heat and changes After it becomes a liquid, there are also high sealing requirements for the battery module, which increases the design cost. In addition, there is another improved technical solution in the prior art, which is to flow the fluid through the water-cooled plate and use the water-cooled plate to take away the heat of the battery. In this method, a single water-cooled plate can only contact one surface of the battery module, and the contact surface There is a certain contact gap, there is a large contact thermal resistance, the limited contact area and the existence of large contact thermal resistance lead to the low efficiency of the liquid cooling system and uneven cooling of the single battery.

Utility model content

The utility model aims to solve the technical problem that the traditional power battery module cannot be well cooled and the cooling effect among the single batteries is unbalanced.

In order to solve the above technical problems, the utility model provides a power battery module, including: a lower cover, an upper cover, a front cover and a rear cover, the lower cover includes a cooling plate, and a There are several partitions, and intervals are formed between two adjacent partitions; the upper cover is sealed and connected above the several partitions, and the front cover is sealed and connected to the front of the several partitions. side, the rear cover is sealed and connected to the rear side of the plurality of partitions; the cooling plate, upper cover, front cover, and rear cover are sealed and connected with the plurality of partitions to form several sealed spaces , the sealed space accommodates the pole core and the electrolyte; the upper cover and the cooling plate are respectively provided with a main flow channel, and the separator is provided with a flow channel, and the flow channel is connected with the upper cover and the cooling plate. The main channels are connected.

Preferably, a plurality of pole cores are accommodated in the plurality of sealed spaces, electrode terminals respectively lead out from the plurality of pole cores, and the electrode terminals pass through the front cover plate and are insulated from the front cover plate.

Preferably, the electrode terminals of the plurality of pole cores are connected in series or in parallel through metal sheets, and the power battery module also includes a front panel and a rear panel, the front panel is arranged on the front side of the front cover, and is connected to the upper cover It is tightly connected with the lower cover, and there are two electrode outlets on the front panel, and the two electrode outlets respectively lead out metal sheets; The lower cover is tightly connected.

Preferably, the cooling plate is provided with an outlet main channel, and one side of the cooling plate is provided with a fluid outlet of the outlet main channel; the upper cover is provided with an inlet main channel, and the side of the upper cover away from the fluid outlet is provided with an inlet main channel The fluid inlet, the cross-sectional dimension of the fluid inlet is 10%-20% smaller than the cross-sectional dimension of the fluid outlet.

Preferably, ring grooves are provided at the fluid inlet and the fluid outlet, and sealing rings are installed in the ring grooves.

Preferably, the plurality of baffles include two outer baffles located at the outermost sides of the cooling plate and at least one intermediate baffle located between the two baffles, the wall thickness of the outer baffles is greater than that of the intermediate baffles the wall thickness.

Preferably, the front cover, the rear cover, the upper cover, and the lower cover are heat conducting members.

Preferably, the cross-sectional area of the inlet main channel is 0.5-2 times the sum of the cross-sectional areas of the respective branch channels.

Preferably, the width of the split channel is more than 2mm.

Preferably, the power battery module further includes a temperature sensor for detecting the temperature of each single battery and a thermal manager for cooling or heating each single battery according to the temperature detected by the temperature sensor, and the temperature sensor is installed on On the power battery module, the thermal manager is electrically connected to the power battery module and the temperature sensor.

The present invention also provides another power battery module, including: a lower cover, an upper cover, a front cover and a rear cover, the lower cover includes a cooling plate, and several separators arranged on the cooling plate, An interval is formed between two adjacent partitions; the upper cover is sealed and connected above the several partitions, the front cover is sealed and connected to the front side of the several partitions, and the rear The cover plate is sealed and connected to the rear side of the plurality of partitions; the cooling plate, upper cover, front cover, and rear cover are sealed and connected with the plurality of partitions to form several sealed spaces, and the sealed space A single battery is accommodated inside; the upper cover and the cooling plate are respectively provided with a main flow channel, and the separator is provided with a flow channel, and the flow channel is connected with the main flow channel in the upper cover and the cooling plate.

Compared with the traditional power battery module, in the power battery module of the present utility model, the cooling plate, the upper cover, the front cover, and the rear cover are sealed and connected with the plurality of partitions to form several sealed spaces, Pole cores and electrolytes or single batteries are accommodated in the sealed space; a main channel is respectively provided in the upper cover and the cooling plate, and a flow channel is provided in the separator, and the flow channel is connected with the upper cover. It communicates with the main channel in the cooling plate; this structure can not only effectively cool or heat the power battery module, but also control the temperature of the pole core and electrolyte in each sealed space within an appropriate range, so that the power battery The temperature of each part of the module maintains good consistency.

Description of drawings

Fig. 1 is a schematic perspective view of a power battery module according to the present invention;

Fig. 2 is a schematic diagram of the lower cover of the power battery module according to the present invention;

Fig. 3 is a schematic diagram of the upper cover of the power battery module according to the present invention;

Fig. 4 is a schematic cross-sectional view of a power battery module according to the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings. Herein, the same reference numerals denote the same constituents. Moreover, in this article, the orientation terms such as "upper", "lower", "front", "rear" are terms based on the orientation on the diagram, which may be different from the actual installation situation, and are not used to limit this Scope of utility model.

As shown in Figures 1-4, the power battery module of the preferred embodiment of the present invention includes: a lower cover 1, an upper cover 2, a front cover 3 and a rear cover 4, the lower cover 1 includes a cooling plate 10, and a On the plurality of partitions 11 on the cooling plate 10, a space 12 is formed between two adjacent partitions 11; the upper cover 2 is sealed and connected above the plurality of partitions 11, and the front The cover plate 3 is sealed and connected to the front side of the plurality of partitions 11, and the rear cover 4 is sealed and connected to the rear side of the plurality of partitions 11; the cooling plate 10, the upper cover 2, the front cover 3. The rear cover plate 4 is sealed and connected with the plurality of separators 11 to form several sealed spaces 13, and the sealed spaces 13 contain pole cores and electrolyte; and, the cooling plate 10 and the upper cover 2 The main channels 101, 21 are respectively provided, and the divider 11 is provided with a sub-channel 111, and the sub-channel 111 communicates with the main channels 101, 21 in the cooling plate 10 and the upper cover 2; so that the flow into the main channel The fluid is divided into the sub-flow channels of the several partitions in the main channel, effectively cooling the pole core and the electrolyte in the several sealed spaces formed by the several partitions, and then the fluid flows into another main channel. During the process, the pole cores and the electrolyte in the several sealed spaces are uniformly and effectively cooled, so that the temperature of the power battery module is maintained in good consistency. The components in the power battery module are described in detail below.

Referring to FIG. 2 , the lower cover 1 includes a cooling plate 10 and a plurality of partitions 11 arranged on the cooling plate 10 , a gap 12 is formed between two adjacent partitions 11 , and the gap 12 is After sealing, a sealed space 13 is formed; in a preferred embodiment, the plurality of partitions 11 and the cooling plate 10 are integrally formed to facilitate processing and assembly with other components. Of course, the utility model is not limited thereto. The partitions 11 Also available as separate parts. Preferably, the plurality of baffles 11 include two outer baffles located at the outermost sides of the cooling plate 10 and at least one intermediate baffle located between the two outer baffles, and the wall thickness of the outer baffles is greater than the wall thickness of the middle partition; appropriately thickening the wall thickness of the outer partition is conducive to strengthening the overall strength of the power battery module. In this embodiment, the cooling plate 10 is provided with seven partitions 11, and the seven partitions 11 are formed with six intervals 12, and after being closed, six compartments for sealing the pole core and the electrolyte are correspondingly formed. A sealed space in which the outermost two partitions have a greater wall thickness than the five middle partitions.

Referring to Fig. 3, the upper cover 2 is installed above the plurality of partitions 11, in order to make the connection between the upper cover 2 and the partitions 11 more reliable, the partition 11 is provided with a groove 19, and the upper cover 2 A corresponding protrusion (not shown) is provided at the joint with the partition plate 11 . It can be understood that the groove 23 can also be provided on the upper cover 2 , and the protrusion (not shown) can be provided on the partition 11 . Through the corresponding arrangement of protrusions and grooves that cooperate with each other between the upper cover 2 and the partitions 11 , the upper cover 2 and the plurality of partitions 11 can achieve good engagement.

Referring to Fig. 2, Fig. 3 and Fig. 4 at the same time, in the present embodiment, the outlet main channel 101 is established in the cooling plate 10, and the fluid outlet 15 of the outlet main channel 101 is provided on one side of the cooling plate 10; The upper cover 2 is provided with an inlet main channel 21, and one side of the upper cover 2 is provided with a fluid inlet 25 of the inlet main channel 21. Preferably, the fluid inlet 25 is located on a side away from the fluid outlet 15, which is beneficial to the circulation of the fluid. . In addition, it is worth mentioning that the cross-sectional size of the fluid inlet 25 is 10%-20% smaller than the cross-sectional size of the fluid outlet 15. When there are several power battery modules, the The fluid outlet 15 and the fluid inlet 25 can be connected by welding, and the cross-sectional size of the fluid inlet 25 is smaller than the cross-sectional size of the fluid outlet 15, which is beneficial to welding. In other embodiments of the present utility model, the inlet main channel can be set in the cooling plate, and the outlet main channel can be set in the upper cover; the cross-sectional size of the fluid inlet can also be larger than the cross-sectional size of the fluid outlet, which is not limited within the range described in this example.

Further, ring grooves 251 and 151 are provided at the fluid inlet 25 and the fluid outlet 15, and sealing rings are installed in the ring grooves 251 and 151. When adjacent power battery modules are connected, bolts ( (not shown)) to compress the sealing rings in the ring grooves 251, 151 to realize the sealed connection between the power battery modules, which is beneficial to the circulation of fluid in each power battery module.

Continue to refer to Fig. 1 and Fig. 4, described front cover plate 3 is sealingly connected to the front side of described several dividing plates 11, and described rear cover plate 4 is sealingly connected to the rear side of described several dividing plates 11; The cooling plate 10, the upper cover 2, the front cover 3, and the rear cover 4 are sealed and connected with the plurality of partitions 11 to form several sealed spaces 13, and each sealed space 13 contains components such as pole cores and electrolytes. The present invention forms sealed space 13 by above-mentioned assembly, and described sealed space preferably accommodates pole core and electrolytic solution, and does not need to accommodate the shell of the unit battery of existing packaging pole core and electrolytic solution, by existing power battery The outer shell of the module is integrated with the outer shell of the battery cell, which saves material, and has a compact structure and saves occupied space. Of course, the sealed space can also be used to place battery cells sealed with pole cores and electrolyte, which is convenient for installation, but does not save material and space.

Referring to Fig. 1 and Fig. 2, in this embodiment, there are several front cover plates 3, which are installed on the front sides of the several intervals 12 correspondingly, and the opposite sides of two adjacent partitions 11 are provided There is a card slot 14, and the two sides of the front cover 3 are respectively locked in the card slots 14 of two adjacent partitions 11, so as to be sealed and connected to the front side of the interval 12; correspondingly, the rear cover The setting form of 4 is similar to the front cover 3, and can also be several, which are respectively sealed and connected to the rear side of the plurality of intervals 12; of course, the front cover 3 and the rear cover 4 can be integral cover plates , simultaneously sealed on the front side and the rear side of the several intervals 12, it can be understood that, as long as the cover plate can seal the front side and the rear side of the intervals 12 can be used in the present utility model.

Referring to Fig. 1, several pole cores (not shown) are accommodated in the several sealed spaces 13, and the pole cores lead out to electrode terminals 18 respectively, and the electrode terminals 18 pass through the front cover plate 3, and the electrode terminals 18 are connected in series or in parallel through flexible metal sheets 16, for example, through copper sheets 16, so as to realize the series or parallel connection of the several pole cores. It is worth mentioning that the electrode terminal 18 and the front cover 3 need to be insulated, and a certain gap can be reserved between the two, and filled with injection molded parts to realize the function of sealing and insulating. Furthermore, the power battery module of the preferred embodiment of the present utility model also includes a front panel 5 and a rear panel (not shown), the front panel 5 is arranged on the front side of the front cover 3, and the upper cover 2 and the The lower cover 1 is tightly connected, and the front panel 5 is provided with two electrode outlets 51, 52, and the two electrode outlets 51, 52 are respectively used to extract the metal sheet 16 to realize electrical energy extraction. In this embodiment, six pole cores are respectively installed in the six sealed spaces 13 and electrolytes are contained therein, and six electrode terminals 18 are respectively drawn out from the six pole cores, and the six electrode terminals 18 pass through The metal sheets 16 are connected in series (only the connection on the front side of the power battery module is shown in the figure, and the connection on the rear side is not shown), and the two outermost electrode terminals 18 are respectively connected with two metal sheets 16, the two The metal sheet 16 respectively passes through the two outlets 51 and 52 on the front panel 5 for connecting to an external load (such as an electrical appliance or a charger).

In this embodiment, bolt installation holes 22 and 17 are respectively provided on the upper cover 2 and the lower cover 1, and bolt connection holes 53 are correspondingly provided on the front panel 5, through the corresponding connection of bolts, the The front panel 5 can be firmly connected with the upper cover 2 and the lower cover 1 . Similar to the arrangement form of the front panel 5 , the rear panel is arranged on the rear side of the rear cover 4 and is firmly connected with the upper cover 2 and the lower cover 1 .

It is worth mentioning that the upper cover 2 and the lower cover 1 of the power battery module need to circulate fluid, and in order to effectively transfer heat between the fluid and the electrolyte, materials with good thermal conductivity and certain strength should be used. Aluminum alloys are preferred. More preferably, the front cover 3 and the rear cover 4 are also made of materials with good thermal conductivity, and can be fixed on the lower cover 1 by brazing or laser welding. The exemplary processing technology of the upper cover 2 and the lower cover 1 is given here. The upper cover 2 and the lower cover 1 can be initially formed by a metal drawing process, and then the flow channel is processed by a mechanical processing method, and finally by welding. To connect the two, the method of brazing process or laser welding is preferred. The front panel 5 and the rear panel of the power battery module are mainly used for supporting and sealing, and do not require heat conduction. They can be molded with plastic, preferably PPO plastic, and made by injection molding.

As shown in FIG. 4 , a schematic cross-sectional view of the power battery module of this embodiment is shown. The fluid enters from the fluid inlet 25 of the inlet main channel 21 of the upper cover 2 of the power battery module, and after passing through the inlet main channel 21, it is divided into each sub-flow channel 111, and then gathers into the outlet main channel 101 and flows out from the fluid outlet 15. Each of the sub-flow channels 111 Between them is a sealed space 13 for placing pole cores and electrolyte, therefore, the power battery module of the present utility model can evenly cool (it can be understood that it can also be used to heat the electrolyte) the electrolyte in each sealed space 13, To achieve good consistency in the temperature of each part of the power battery module, and has a rapid heat transfer function.

In a preferred embodiment of the present invention, the cross-sectional area of the inlet main channel 21 and the outlet main channel 101 is larger than the cross-sectional area of the flow channel 111 . In a further preferred embodiment of the present utility model, in order to make the fluid in the main channel flow into each sub-channel effectively, the cross-sectional area of the main channel is preferably 0.5-2 times the sum of the cross-sectional areas of each sub-channel. In the embodiment shown in FIG. 4 , there are seven sub-channels 111 in total, and the cross-sectional area of the main channels 21 , 101 is twice the cross-sectional area of the seven sub-channels 111 .

In addition, the size of the flow channels of each of the sub-channels 111 must be consistent to ensure that the flow rate of the fluid flowing through each of the sub-channels 111 is consistent, and the electrolyte in each sealed space is evenly cooled, and the width of each of the sub-channels 111 cannot be too small , so as not to generate greater flow resistance, the width of the flow channel is preferably more than 2mm.

On the other hand, the power battery module of the present utility model also includes a temperature sensor (not shown) for detecting the temperature of each single battery and a heat sensor for cooling or heating each single battery according to the temperature detected by the temperature sensor. Manager (not shown), wherein, several pole cores of the power battery module can be connected in series or in parallel through the electrode terminals, and a temperature sensor can be provided on the electrode terminals, so as to transmit the temperature signal to the thermal manager in real time, so The thermal manager is electrically connected with the power battery module and temperature sensor to monitor the temperature of the pole core and the electrolyte in each sealed space, so as to realize the cooling or heating function of the power battery module, which can be realized by changing the temperature of the fluid Heating or cooling; the thermal manager can be a common thermal manager in the prior art, which has the functions of cooling and heating the fluid and adjusting the flow rate of the fluid.

Herein, the fluid may be various refrigerants and heating agents, such as freon, azeotropic mixture, hydrocarbon, ammonia or fluorine inert liquid.

To sum up, in the power battery module provided by the utility model, the cooling plate, the upper cover, the front cover, and the rear cover are sealed and connected with the above-mentioned several separators to form several partitions for accommodating pole cores and electrolytic cells. The sealed space of the liquid, and the main channel is respectively provided in the upper cover and the cooling plate, and the sub-flow channel is provided in the partition plate, and the sub-channel communicates with the main channel in the upper cover and the cooling plate. There is fluid flow in the pole core in the sealed space and the separators on both sides of the electrolyte. The fluid can flow into the main channel of the upper cover, and then evenly divide into the shunt channels on both sides of each sealed space, and quickly transfer heat to the The electrolyte finally collects into the main channel of the cooling plate and flows out, so that the pole core and the electrolyte in each sealed space can be cooled or heated evenly and effectively.

The power battery module of the utility model has the following characteristics: 1. The fluid in the shunt channel of the power battery module of the utility model transfers heat to the electrolyte through the separator, and the contact thermal resistance is small; moreover, several separators are set to form several The sealed space is used to accommodate the pole core and the electrolyte, and the shunt channel is set in the separator, so that the heat transfer contact area is large, the heat transfer efficiency is high, and the temperature uniformity of each sealed space of the battery module can be better maintained.

2. The fluid in the power battery module of the present invention can be recycled, and the flow rate can be adjusted by the thermal manager of the prior art. Compared with air cooling, it has low energy consumption and low noise.

3. In the sealed space of the power battery module of the present invention, only the pole core and the electrolyte can be accommodated, instead of the existing shell for sealing the pole core and the electrolyte, and the shell of the existing single battery and the power The casing of the battery module is integrated into one body, which saves material, and has a compact structure and saves occupied space.

It is easy for those skilled in the art to know that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. All modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model etc., all should be included within the protection scope of the present utility model. The protection scope of the utility model is determined by the claims.

Claims (11)

1. a power battery module is characterized in that, comprising: lower cover, loam cake, front shroud and back shroud, described lower cover comprise coldplate and are located at several dividing plates on the described coldplate, are formed with between two adjacent dividing plates at interval; Described loam cake is sealedly attached to the top of described several dividing plates, and described front shroud is sealedly attached to the front side of described several dividing plates, and described back shroud is sealedly attached to the rear side of described several dividing plates; Described coldplate, loam cake, front shroud, back shroud and described several dividing plates are tightly connected and form several seal cavities, contain pole piece and electrolyte in the described seal cavity;

Be respectively equipped with sprue in described loam cake and the coldplate, be provided with runner in the described dividing plate, the sprue in described runner and loam cake and the coldplate is connected.

2. power battery module according to claim 1 is characterized in that, contains several pole pieces in described several seal cavities, and described several pole pieces lead to electrode terminal respectively, and described electrode terminal passes described front shroud and insulate mutually with described front shroud.

3. power battery module according to claim 2, it is characterized in that, the electrode terminal of described several pole pieces is by the sheet metal serial or parallel connection, described power battery module also comprises front panel and rear board, described front panel is located at the front side of front shroud, be fastenedly connected with described loam cake and lower cover, and front panel is provided with two electrode outlets, described two electrode outlets are drawn sheet metal respectively; Described rear board is located at the rear side of back shroud, is fastenedly connected with described loam cake and lower cover.

4. power battery module according to claim 1 is characterized in that, sets out a mouthful sprue in the described coldplate, and a side of coldplate is provided with the fluid issuing of outlet sprue; Establish the import sprue in the described loam cake, loam cake is provided with the fluid inlet of import sprue away from a side of fluid issuing, and the cross sectional dimensions of described fluid inlet is than the little 10%-20% of cross sectional dimensions of described fluid issuing.

5. power battery module according to claim 4 is characterized in that, described fluid inlet place, fluid outlet are equipped with annular groove, in the described annular groove sealing ring are installed.

6. power battery module according to claim 1, it is characterized in that, described several dividing plates comprise that the wall thickness of described external partition is greater than the wall thickness of described central dividing plate at outermost two external partitions of coldplate and at least one central dividing plate between described two dividing plates.

7. according to any described power battery module of claim 1-6, it is characterized in that described front shroud, back shroud, loam cake, lower cover are heat-conducting piece.

8. according to any described power battery module of claim 1-6, it is characterized in that the 0.5-2 of the sectional area summation that described import sprue sectional area is each runner doubly.

9. according to any described power battery module of claim 1-6, it is characterized in that the width of described runner is more than 2mm.

10. power battery module according to claim 1, it is characterized in that, described power battery module also comprises the temperature sensor of the temperature that detects each cell and the heat management device that each cell is freezed or heats according to the temperature that described temperature sensor detects, described temperature sensor is installed on the power battery module, and described heat management device and power battery module, temperature sensor electrically connect.

11. a power battery module is characterized in that, comprising: lower cover, loam cake, front shroud and back shroud, described lower cover comprise coldplate and are located at several dividing plates on the described coldplate, are formed with between two adjacent dividing plates at interval; Described loam cake is sealedly attached to the top of described several dividing plates, and described front shroud is sealedly attached to the front side of described several dividing plates, and described back shroud is sealedly attached to the rear side of described several dividing plates; Described coldplate, loam cake, front shroud, back shroud and described several dividing plates are tightly connected and form several seal cavities, contain cell in the described seal cavity;

Be respectively equipped with sprue in described loam cake and the coldplate, be provided with runner in the described dividing plate, the sprue in described runner and loam cake and the coldplate is connected.

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