High-magnification charging and discharging module

Abstract

The utility model relates to the technical field of batteries, and discloses a high-magnification charging and discharging module which comprises at least two groups of battery cell modules, each battery cell module consists of a plurality of battery cells, and a busbar is arranged between every two adjacent battery cells for electric connection; a top cooling plate is arranged between every two adjacent battery cell modules and comprises an upper-layer cooling plate and a lower-layer cooling plate, runners are arranged in the two layers of cooling plates and are communicated with each other, the cross section of the upper-layer cooling plate is T-shaped, the lower-layer cooling plate is composed of two symmetrical L-shaped structures, and a mounting area is formed between the upper-layer cooling plate and the lower-layer cooling plate; the mounting area is used for accommodating a busbar and a pole of a battery cell; a plurality of longitudinally-penetrating welding preformed holes are formed in the upper-layer cold plate in the arrangement direction of the battery cells, circular marks for distinguishing positive and negative electrodes are arranged on pole columns of the battery cells, and the circle centers of the welding preformed holes and the circle centers of the circular marks are coaxial. According to the utility model, the fast charging time is effectively shortened, and the charging and discharging performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a high rate charge and discharge module. BACKGROUND

[0002] Among the core components of new energy electric vehicles, the performance of power batteries directly determines key indicators such as vehicle range, acceleration performance, and charging speed. In order to meet user demand for fast charging and high-performance driving, it has become an inevitable trend for power batteries to develop towards high-rate charging and discharging.

[0003] During the charging and discharging process of the battery cell, the current-carrying parts such as busbars, poles, and tabs, as well as the welding area, become the main heat sources. Due to the difficulty in timely dissipating heat from these areas, the local temperature is too high, further exacerbating the overall temperature rise problem of the battery; and it also conducts heat to other components through the internal structure of the battery cell (such as JR, laminations, etc.), forming a complex heat transfer network. This uneven heat distribution causes some areas to overheat, while other areas may experience performance degradation due to insufficient cooling.

[0004] For high-rate batteries, the heat load caused by high current density during charging and discharging is too large, and the cooling effect of existing liquid or air cooling methods is limited, leading to rapid temperature rise inside the battery, which easily causes overheating, and thus limits the charging and discharging rate. This not only affects the output power and response speed of the battery, but also may cause performance degradation of the battery cell, shortening the service life of the battery. SUMMARY

[0005] The utility model intends to provide a high-rate charge and discharge module to shorten the fast charging time and improve the charging and discharging performance.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-rate charge and discharge module, comprising at least two groups of battery cell modules, each battery cell module being composed of a plurality of battery cells, and a busbar being arranged between adjacent two battery cells for electrical connection; a top cooling plate is arranged between adjacent two battery cell modules, the top cooling plate comprising an upper cooling plate and a lower cooling plate, both the upper cooling plate and the lower cooling plate being internally provided with flow channels and being in communication with each other, the cross section of the upper cooling plate being T-shaped, the lower cooling plate being composed of two symmetrical L-shaped structures, and an installation area being formed between the upper cooling plate and the lower cooling plate for accommodating the busbar and the poles of the battery cells; a plurality of longitudinally penetrating welding reserved holes are formed in the upper cooling plate along the arrangement direction of the battery cells, a circular mark for distinguishing the positive and negative poles is arranged on the pole of the battery cell, and the centers of the circular mark and the welding reserved hole are coaxial.

[0007] The principle and advantages of the present scheme are as follows:

[0008] 1. Busbars and terminals are the main channels for current to enter and exit the battery pack. During charging and discharging, these areas carry large currents, causing a rapid increase in local temperature. Moreover, the welded areas are more prone to hot spot effects due to stress concentration at the material joints, further exacerbating the local temperature rise. Therefore, in this solution, the upper and lower cold plates of the top cold plate form an installation area for accommodating the busbars and terminals. The top cold plate covers most of the welding area between the busbars and terminals, effectively increasing the cooling area for overheated areas. This effectively prevents the welding area between the busbars and terminals from failing to dissipate heat effectively, thus avoiding heat conduction to adjacent cells and causing the temperature of the entire battery module to rise. This significantly improves the overall heat dissipation performance of high-rate cells, shortens fast charging time, and improves the charging and discharging performance of the cells.

[0009] 2. This design cleverly integrates the busbar and cell terminals in the mounting area between the upper and lower cold plates, making the entire battery module structure more compact and increasing its structural strength. At the same time, it reduces additional connecting parts and assembly processes, lowering manufacturing complexity and cost. The integrated design reduces contact thermal resistance during heat transfer, improves heat conduction efficiency, and further enhances the cooling effect.

[0010] 3. The circular markings on the cell terminals are coaxial with the center of the pre-drilled welding holes, ensuring precise alignment during welding. This avoids poor contact or hot spot effects caused by welding position deviations, improving the electrical connection reliability and safety of the battery module. Furthermore, the pre-drilled welding holes simplify the welding process, reduce human error, and improve production efficiency and product quality.

[0011] Furthermore, the busbar and the top cooling plate are detachably connected.

[0012] When a battery cell, busbar, or top cooling plate needs to be repaired or replaced, the detachable connection design of the busbar and top cooling plate eliminates the need to completely disassemble the battery module, simplifying the maintenance and repair process and reducing maintenance costs and time. Moreover, each component can be tested, inspected, and maintained independently, improving the reliability and maintainability of the entire system.

[0013] Furthermore, the diameter of the pre-drilled welding hole is 4-20mm.

[0014] If the diameter of the welding pre-drilled hole is too large, the coverage area of ​​the top cooling plate over the welding area of ​​the busbar and the pole will be reduced, affecting the heat dissipation effect.

[0015] Furthermore, a thermally conductive layer is provided between the top cooling plate and the battery cell. The thermally conductive layer is a thermally conductive structural adhesive, a thermally conductive gel, or a thermally conductive pad.

[0016] The heat-conducting layer can effectively fill the small gap between the top cooling plate and the battery cell, reduce the contact thermal resistance, make the heat transmit from the battery cell to the top cooling plate more quickly, and the heat-conducting material has good heat diffusion performance, can form a uniform heat flow path between the top cooling plate and the battery cell, avoids the local overheating phenomenon, and further improves the heat conduction efficiency of the cooling system; meanwhile, the heat-conducting layer has a certain buffering effect, reduces the physical damage of the battery cell caused by vibration or impact in the charging and discharging process, and improves the mechanical stability of the battery cell.

[0017] Further, the thickness of the heat-conducting layer is 0.4-2.0mm.

[0018] The thickness of the heat-conducting layer is limited in the above range, on the one hand, to ensure that the heat-conducting layer can ensure uniform distribution of heat between the top cooling plate and the battery cell, avoid the formation of local hot spots, and thus maintain the stability and consistency of the temperature of the entire battery module; on the other hand, the heat-conducting layer can provide buffering and reduce the physical damage of the battery cell caused by vibration or impact in the charging and discharging process.

[0019] Further, the end of the top cooling plate is provided with a water inlet and a water outlet, and is communicated with the internal flow channel.

[0020] Further, it further comprises a bottom cooling plate arranged at the bottom of the battery cell module and / or a side cooling plate arranged at the side of the battery cell module.

[0021] The scheme realizes multi-surface combined cooling through the cooling structures of top cooling, bottom cooling and side cooling, so that the high-rate battery cell is fully and quickly cooled in the charging and discharging process, the internal temperature of the battery cell is prevented from being too high to affect the charging and discharging rate, and the output power and response speed of the battery are improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of the embodiment of the utility model.

[0023] Figure 2 It is a transverse section schematic view of the embodiment of the utility model. CONCRETE EMBODIMENT

[0024] The following will be further explained in detail through concrete embodiment:

[0025] The reference signs in the drawings of the specification include: battery cell module 100, battery cell 1, pole 11, circular mark 12, busbar 2, top cooling plate 3, upper cooling plate 31, lower cooling plate 32, mounting area 33, welding reserved hole 34, heat-conducting layer 4.

[0026] Embodiment 1

[0027] Basically as the attached Figure 1 , Figure 2As shown: a high rate of charge and discharge module, comprising at least two groups of battery cell module 100, battery cell module 100 is composed of several battery cells 1, two adjacent battery cells 1 is provided with busbar 2, busbar 2 and the pole 11 of battery cell 1 are welded; two adjacent battery cell module 100 is provided with top cold plate 3, top cold plate 3 includes upper cold plate 31 and lower cold plate 32, two layers of cold plate are provided with flow channel inside and are communicated with each other, the cross section of upper cold plate 31 is T-shaped, lower cold plate 32 is composed of two symmetrical L-shaped structures, two symmetrical installation areas 33 are formed between upper cold plate 31 and lower cold plate 32, busbar 2 and the pole 11 of battery cell 1 are located in installation area 33; a plurality of longitudinal through welding reserved holes 34 are opened in upper cold plate 31 along the arrangement direction of battery cell 1, the pole 11 of battery cell 1 is provided with circular mark 12 for distinguishing positive and negative poles, the centers of the two are coaxial; the diameter of welding reserved hole 34 is 4-20mm, the diameter of welding reserved hole 34 is too large to reduce the coverage area of top cold plate 3 to the welding area of busbar 2 and pole 11, which affects the heat dissipation effect, preferably, the diameter of welding reserved hole 34 in the embodiment is 15mm.

[0028] Compared with the top cold plate 3 between two adjacent battery cell modules 100, the top cold plate 3 at the outermost side of the plurality of battery cell modules 100 is half of the middle position top cold plate 3, that is, only one installation area 33, the busbar 2 and the pole 11 of the outermost side are still located in the installation area 33.

[0029] Through the above setting, the installation area 33 formed between the upper cold plate 31 and the lower cold plate 32 of the top cold plate 3 fully covers the busbar 2 and the pole 11 of the battery cell 1, and the top cold plate 3 covers most of the welding area of the busbar 2 and the pole 11, effectively increasing the cooling area of the overheated area, effectively avoiding the fact that the welding area of the busbar 2 and the pole 11 cannot be effectively cooled, and the heat is conducted to the adjacent battery cell 1, resulting in the temperature rise of the whole battery module, so that the overall heat dissipation performance of the high rate battery cell 1 is obviously improved, the fast charging time is shortened and the charge and discharge performance of the battery cell 1 is improved.

[0030] Secondly, the installation area 33 between the upper cold plate 31 and the lower cold plate 32 ingeniously integrates the busbar 2 and the pole 11 of the battery cell 1, so that the structure of the whole battery module is more compact, the structural strength is increased, at the same time, the additional connecting parts and assembly process are reduced, the manufacturing complexity and cost are reduced. The integrated design reduces the contact thermal resistance in the heat transfer process, improves the heat conduction efficiency, and further enhances the cooling effect.

[0031] Preferably, the busbar 2 is detachably connected to the top cold plate 3, and the detachable connection includes but is not limited to gluing, riveting, etc., wherein the heat-conducting structural adhesive is used when gluing. In this way, during subsequent maintenance, the battery module does not need to be disassembled as a whole, simplifying the maintenance and repair process, and reducing maintenance cost and time.

[0032] A heat-conducting layer 4 is arranged between the top cold plate 3 and the battery cell 1, and the heat-conducting layer 4 is a heat-conducting structural adhesive, a heat-conducting gel or a heat-conducting pad. The thickness of the heat-conducting layer 4 is 0.4-2.0 mm. Within this thickness range, the heat-conducting layer 4 can effectively ensure uniform distribution of heat between the top cold plate 3 and the battery cell 1, avoid the formation of local overheating points, and play a buffering role to reduce physical damage to the battery cell 1 caused by vibration or impact during charging and discharging. If the thickness is too small, the heat-conducting layer 4 cannot completely fill the small gaps between the top cold plate 3 and the battery cell 1, thereby increasing the contact thermal resistance and reducing the overall heat conduction efficiency. If the thickness is too large, it will hinder the rapid transfer of heat, causing some heat to accumulate near the battery cell 1, increasing the temperature fluctuations inside the battery module, and affecting the battery performance.

[0033] The heat-conducting layer 4 is a heat-conducting structural adhesive, a heat-conducting gel or a heat-conducting pad. Depending on different application environments and requirements, different types of heat-conducting materials can be selected, and their thicknesses can be adjusted. For example, in situations requiring high thermal conductivity and good elasticity, a heat-conducting gel can be selected, and its thickness can be set to about 1 mm. In situations requiring strong adhesion, a heat-conducting structural adhesive can be selected, and its thickness can be set to about 0.4 mm. In situations requiring detachability and reusability, a heat-conducting pad can be selected, and its thickness can be set to about 1.8 mm.

[0034] Example 2

[0035] On the basis of Example 1, this embodiment further includes a bottom cold plate (not shown in the figure) arranged at the bottom of the battery cell module 100, and / or a side cold plate (not shown in the figure) arranged at the side of the battery cell module 100.

[0036] Through the multi-surface combined cooling of the top cold plate, the bottom cold plate and the side cold plate, the high-rate battery cell 1 can be fully and quickly cooled during charging and discharging, avoiding excessive internal temperature rise of the battery cell 1 and affecting the charging and discharging rate, and improving the output power and response speed of the battery.

[0037] The above only is the embodiment of the present application, and the well-known specific technical solutions and / or common knowledge 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 solutions 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 claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A high rate charge-discharge module, characterized by: The application relates to a battery module, which comprises at least two groups of battery cell modules, each of which is composed of a plurality of battery cells, and a busbar is arranged between adjacent two battery cells for electric connection; a top cooling plate is arranged between adjacent two battery cell modules, the top cooling plate comprises an upper cooling plate and a lower cooling plate, flow channels are arranged in the two cooling plates and are communicated with each other, the upper cooling plate is in a T-shaped cross section, the lower cooling plate is composed of two symmetrical L-shaped structures, an installation area is formed between the upper cooling plate and the lower cooling plate, and the installation area is used for accommodating the busbar and the pole of the battery cell; a plurality of longitudinal welding reserved holes are formed in the upper cooling plate along the arrangement direction of the battery cells, a circular mark for distinguishing the positive and negative poles is arranged on the pole of the battery cell, and the centers of the circular mark and the welding reserved hole are coaxial.

2. The high rate charge and discharge module of claim 1, wherein: The busbar and the top cooling plate are detachably connected.

3. The high rate charge and discharge module of claim 2, wherein: The diameter of the welding reserved hole is 4-20 mm.

4. The high rate charge and discharge module of claim 3, wherein: A heat-conducting layer is arranged between the top cooling plate and the battery cell, and the heat-conducting layer is a heat-conducting structural adhesive, a heat-conducting gel or a heat-conducting gasket.

5. The high rate charge and discharge module of claim 4, wherein: The thickness of the heat-conducting layer is 0.4-2.0 mm.

6. The high rate charge and discharge module of claim 5, wherein: Water inlets and outlets are arranged at the ends of the top cooling plate and are communicated with the flow channels in the top cooling plate.

7. The high rate charge and discharge module of claim 1, wherein: A bottom cooling plate is arranged at the bottom of the battery cell module, and / or a side cooling plate is arranged at the side of the battery cell module.

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