Battery capable of improving cooling performance of battery cell

Abstract

The utility model relates to the technical field of batteries, and discloses a battery capable of improving the cooling performance of battery cells, which comprises a battery cell module consisting of a plurality of battery cells as well as a bottom cooling plate and a top cooling plate which are arranged on the upper side and the lower side of the battery cell module, and runners are arranged in the bottom cooling plate and the top cooling plate; the left side and the right side of the top cooling plate are connected with a plurality of busbars, each busbar comprises a connecting part and a fixing part, the connecting parts are connected with pole columns of the battery cells, the fixing parts are connected with the top cooling plate, the connecting parts and the fixing parts are longitudinally staggered, and arc-shaped transition parts are arranged between the connecting parts and the fixing parts. Through mutual cooperation of top cooling and bottom cooling, the heat dissipation performance of the battery cell is effectively improved, and the cooling effect is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery of improving the cooling performance of electric core. BACKGROUND

[0002] At present, the battery core of new energy electric vehicle mostly adopts square shell design, mainly because square shell core has the advantages of structural stability, high space utilization, good heat dissipation performance, high consistency, easy management and monitoring, high safety and easy maintenance and replacement.

[0003] In the prior art, the cooling structure of square shell core has inter-core large surface cooling, bottom surface cooling of core and side cooling, but for high rate charge and discharge working conditions (>=2C or 200A) and large capacity (height >=120mm) core, because the heat production rate of core is much larger than the liquid cooling heat dissipation power or the thermal resistance in the height direction of core is larger, the heat flow of the top cooling is low, the core temperature rises rapidly, and the cooling effect of the above cooling structure is poor, especially the bottom cooling structure scheme which is most widely used, which leads to the failure to better play the performance of the core. SUMMARY

[0004] The utility model intends to provide a battery of improving the cooling performance of electric core to improve the heat dissipation efficiency and reduce the temperature of battery.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme: a battery of improving the cooling performance of electric core, which comprises a core module composed of a plurality of electric cores, a bottom cooling plate and a top cooling plate installed on the upper and lower sides of the core module, and a flow channel arranged in the bottom cooling plate and the top cooling plate; a plurality of busbars are connected to the left and right sides of the top cooling plate, the busbar comprises a connecting part and a fixing part, the connecting part is connected with the pole of the electric core, the fixing part is connected with the top cooling plate, the connecting part and the fixing part are longitudinally staggered, and an arc-shaped transition part is arranged between the connecting part and the fixing part.

[0006] The principle and advantages of the scheme are as follows:

[0007] 1、Compared with the traditional cooling structure which only cools the bottom and side of the core, the bottom cooling plate and the top cooling plate are arranged on the upper and lower sides of the core module respectively in the scheme to cool synchronously, so that the whole surface of the core can be effectively cooled; secondly, the busbar is integrated on the top cooling plate, so that the top cooling plate cools the top end face of the core and the busbar at the same time, so that the temperature of the high heat generating area such as the core pole and the busbar can be effectively controlled, especially for high rate charge and discharge working conditions or large capacity core, the top cooling effectively avoids the problem of local overheating of the top due to too large current density in the charge and discharge process, effectively improves the performance of the core and prolongs the service life of the core.

[0008] 2、The scheme integrates the busbar and the top cold plate together, simplifies the overall structure of the battery module, reduces the additional connecting components, makes the whole system more compact and stable, and also reduces the thermal resistance and improves the heat conduction efficiency.

[0009] Further, the flow channel in the top cold plate is single-layer, and the fixed part of the busbar is connected with the top surface of the top cold plate.

[0010] Further, the flow channel in the top cold plate is double-layer, and an installation groove is arranged between the two layers of flow channels, the fixed part of the busbar extends into the installation groove to realize the connection between the top cold plate and the busbar; and structural glue is arranged in the installation groove.

[0011] The above arrangement makes the integration degree between the top cold plate and the busbar higher, and the two can be assembled and fixed first and then processed and assembled with the battery cell, thereby simplifying the process and improving the overall assembly and processing efficiency; and the fixed part of the busbar is located between the two layers of flow channels to realize double-sided cooling and heat dissipation, so that the cooling speed of the busbar and the pole is faster and the cooling effect is better.

[0012] Further, the top cold plate is provided with a spraying hole at the avoiding groove, and a nozzle is arranged in the spraying hole.

[0013] The above arrangement makes the top cold plate have a spraying function, when the battery cell is in thermal runaway, the cooling medium sprayed can quickly take away the heat generated by thermal runaway, so that the thermal runaway is prevented and the thermal safety performance is improved.

[0014] Further, the top cold plate and the battery cell, and the bottom cold plate and the battery cell are both provided with a heat conduction layer, which is a heat conduction structural glue, a heat conduction gel or a heat conduction gasket.

[0015] The heat conduction layer makes the heat uniformly distributed between the top cold plate and the battery cell, avoids the formation of local overheating points, and utilizes the elastic property of the heat conduction layer to realize the buffering effect, absorbs the vibration or impact in the charging and discharging process, and improves the mechanical stability of the battery cell.

[0016] Further, the top cold plate is provided with an avoiding groove along the length direction thereof, and the avoiding groove corresponds to the position of the explosion-proof valve of the battery cell.

[0017] Further, the top cold plate and the bottom cold plate are both provided with a water inlet and a water outlet. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an assembly structure schematic view of the embodiment 1 of the utility model.

[0019] Figure 2 It is an explosion structure schematic view of the embodiment 1 of the utility model.

[0020] Figure 3 This is a top view of Embodiment 2 of the present invention.

[0021] Figure 4 This is a bottom view of the structure of Embodiment 2 of this utility model. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method:

[0023] The reference numerals in the accompanying drawings include: battery module 100, battery cell 1, electrode post 11, bottom cooling plate 2, top cooling plate 3, flow channel 4, busbar 5, connecting part 51, fixing part 52, transition part 53, through hole 54, heat-conducting layer 6, explosion-proof valve 7, clearance groove 8, mounting groove 9, spray hole 10, and heat insulation layer 12.

[0024] Example 1

[0025] The basics are as follows: Figure 1 , Figure 2 As shown, a battery for improving cell cooling performance includes a cell module 100 composed of several cells 1 and a bottom cooling plate 2 and a top cooling plate 3 installed on the upper and lower sides of the cell module 100. Both the bottom cooling plate 2 and the top cooling plate 3 are provided with flow channels 4. Several busbars 5 are connected to the left and right sides of the top cooling plate 3. Each busbar 5 includes a connecting part 51 and a fixing part 52. The connecting part 51 is welded to the terminal post 11 of the cell 1. The fixing part 52 is glued to the top cooling plate 3 with structural adhesive. The connecting part 51 and the fixing part 52 are longitudinally staggered and an arc-shaped transition part 53 is provided between them. In order to prevent stress concentration, a through hole 54 is opened on the transition part 53. The above settings enable simultaneous cooling of the top and bottom of the battery cell module 100, ensuring that the entire surface of the battery cell 1 can be effectively cooled. Especially for high-rate charging and discharging conditions or large-capacity battery cells 1, top cooling effectively avoids the problem of local overheating at the top due to excessive current density during charging and discharging, effectively improving the performance of the battery cell 1 and extending its service life.

[0026] The flow channel 4 inside the top cooling plate 3 is a single layer. The fixing part 52 of the busbar 5 is connected to the top surface of the top cooling plate 3. The top cooling plate 3 cools the top end face of the battery cell 1 and the busbar 5 at the same time, so that the temperature of high heat generation areas such as the terminal post 11 of the battery cell 1 and the busbar 5 can be effectively controlled.

[0027] The heat-conducting layer 6 is arranged between the top cold plate 3 and the battery cell 1 and between the bottom cold plate 2 and the battery cell 1, and is a heat-conducting structural adhesive, a heat-conducting gel or a heat-conducting pad. The thickness of the heat-conducting layer 6 is 0.4-1.5 mm, and preferably, the thickness of the heat-conducting layer 6 in the embodiment is 1 mm. Within the above thickness range, the heat can be evenly distributed between the top cold plate 3 and the battery cell 1, avoiding the formation of local overheating points, and the heat-conducting layer 6 can play a buffering role, reducing the physical damage of the battery cell 1 caused by vibration or impact during charging and discharging; if the thickness is too small, the heat-conducting layer 6 cannot completely fill the small gap between the top cold plate 3 and the battery cell 1, thereby increasing the contact thermal resistance and reducing the overall heat conduction efficiency, and if the thickness is too large, the rapid heat transfer is hindered, causing some heat to accumulate near the battery cell 1, increasing the temperature fluctuation inside the battery module and affecting the battery performance.

[0028] The top cold plate 3 is provided with a relief groove 8 along the length direction thereof, and the top cover of the battery cell 1 is provided with a pressure relief valve 7, the relief groove 8 corresponds to the position of the pressure relief valve 7, so as to ensure that the pressure relief valve 7 can normally open and release pressure when necessary, and ensure the safe pressure relief function of the battery.

[0029] The top cold plate 3 and the bottom cold plate 2 are each provided with a water inlet and a water outlet, and the water inlets and water outlets of the cold plates can be located at the same end or at both ends according to the actual design.

[0030] A heat insulation layer 12 is arranged between the adjacent two battery cells 1, and the heat insulation layer 12 is made of a heat insulation material such as aerogel or foam, so as to reduce the heat conduction between the adjacent battery cells 1 and reduce the risk of local overheating, and the heat insulation layer 12 can also play a mechanical protection role to absorb and buffer external forces.

[0031] Embodiment 2

[0032] In combination with FIGS. 1-3, Figure 3 , Figure 4 Compared with embodiment 1, the difference between the embodiment and embodiment 1 is that the flow channel 4 in the top cold plate 3 is double-layered, the cross section of the flow channel 4 is a harmonica tube cross section, a mounting groove 9 is arranged between the two layers of flow channels 4, the fixed part 52 of the busbar extends into the mounting groove 9 to realize the connection between the top cold plate 3 and the busbar 5, and structural adhesive is arranged in the mounting groove 9 to realize gluing and fixing.

[0033] Compared with the single-layer flow channel 4 in embodiment 1, the integration degree between the top cold plate 3 and the busbar 5 is higher in the embodiment, the two are first assembled and fixed, and then processed and assembled between the battery cell 1, which simplifies the process and improves the overall assembly and processing efficiency; and the fixed part 52 of the busbar 5 is located between the two layers of flow channels 4 to realize double-sided cooling and heat dissipation, so that the cooling speed of the busbar 5 and the pole 11 area is faster, and the cooling effect is better.

[0034] In the embodiment, the avoiding groove 8 penetrates to the bottom along the length direction of the top cooling plate 3, and the processing amount is reduced; preferably, the top cooling plate 3 is provided with a spraying hole 10 at the avoiding groove 8, a nozzle (not shown in the figure) is installed in the spraying hole 10, the nozzle is of the existing structure, and details are not described here again; when the battery cell 1 is in thermal runaway, the heat generated by the thermal runaway is quickly taken away by the spraying cooling medium, the thermal runaway is prevented, and the thermal safety performance is improved.

[0035] The above is only the embodiment of the present application, and the specific technical solutions and / or common knowledge of characteristics in the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the technical scheme of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A battery improving cooling performance of an electric cell, characterized by: The application relates to a battery cell module and a cooling plate.

2. The battery of claim 1, wherein: The flow channel in the top cooling plate is single-layer, and the fixed part of the busbar is connected with the top surface of the top cooling plate.

3. The battery of claim 1, wherein: The flow channel in the top cooling plate is double-layer, and an installation groove is arranged between the two layers of flow channels, the fixed part of the busbar extends into the installation groove to realize the connection between the top cooling plate and the busbar; and structural glue is arranged in the installation groove.

4. The battery of claim 3, wherein: The top cooling plate is provided with a spraying hole at the avoiding groove, and a nozzle is arranged in the spraying hole.

5. The battery of any one of claims 1-4, wherein: Heat-conducting layers are arranged between the top cooling plate and the battery cell and between the bottom cooling plate and the battery cell, and the heat-conducting layers are heat-conducting structural glue, heat-conducting gel or heat-conducting gasket.

6. The battery of claim 5, wherein: The top cooling plate is provided with an avoiding groove along the length direction of the top cooling plate, and the avoiding groove corresponds to the position of the explosion-proof valve of the battery cell.

7. The battery of claim 6, wherein: The top cooling plate and the bottom cooling plate are both provided with water inlets and water outlets.

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