Liquid cooling heat dissipation battery box body structure

Abstract

The invention relates to a liquid cooling heat dissipation battery box body structure which comprises a cover plate, a box body and a battery cell module, the battery cell module is arranged in the box body, and the cover plate covers the top of the box body; the box body comprises a box body and a liquid cooling bottom plate assembly arranged on the bottom surface of the box body; the liquid cooling bottom plate assembly comprises a heat transfer plate, a bent pipe and a reinforcing plate; the side face, close to the heat transfer plate, of the reinforcing plate is provided with a groove matched with the bent pipe, and the bent pipe is arranged in the groove. The heat transfer plate is arranged on the reinforcing plate, and the heat transfer plate is respectively propped against the bottom surface of the battery cell module and the bent pipe. The liquid cooling bottom plate assembly is used for cooling, the heat dissipation speed is high, the heat dissipation effect is good, the occupied space is small, the requirements for the product space and the airtight performance are greatly reduced, later maintenance is facilitated, and the later maintenance cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a battery box structure with liquid cooling and heat dissipation. Background Art

[0002] With the in-depth development of new energy industries such as energy storage, photovoltaics, and wind energy, various new energy sources are integrated to form complementary energy stations. Complementary energy stations generally include wind power energy storage power stations, photovoltaic energy storage power stations, and wind and solar energy storage power stations.

[0003] With the vigorous development of new energy, the current of various new energy products is getting larger and larger, and the performance requirements for products are getting higher and higher. From the current market point of view, the existing battery structures on the market generally adopt air cooling and liquid cooling. The air cooling method requires the formation of air ducts for the modules to effectively cool the battery modules. It has relatively high requirements on the spatial dimensions of the module structure. The module structure must have a fixed air duct and be able to generate effective air convection to achieve effective cooling, which has great application limitations. The conventional liquid cooling method has high requirements for the space requirements and airtight performance of the product, which makes the overall cost of the product high; moreover, the later maintenance of the liquid cooling unit is more troublesome, and a larger space is required to install the liquid cooling unit, and the later maintenance cost is high. Summary of the invention

[0004] The purpose of the present invention is to provide a liquid-cooled battery box structure to solve the technical problems of the existing battery module cooling method having high requirements on structural space and airtightness and high maintenance cost.

[0005] To achieve the above-mentioned purpose, an embodiment of the present invention provides a liquid-cooled battery box structure, comprising a cover plate, a box body and a battery cell module; the battery cell module is arranged in the box body, and the cover plate covers the top of the box body;

[0006] The box body includes a box body body and a liquid-cooled bottom plate assembly arranged on the bottom surface of the box body; the liquid-cooled bottom plate assembly includes a heat transfer plate, a bent pipe and a reinforcing plate; a groove adapted to the bent pipe is arranged on the side of the reinforcing plate close to the heat transfer plate, and the bent pipe is arranged in the groove; the heat transfer plate is arranged on the reinforcing plate, and the heat transfer plate is respectively arranged to abut the bottom surface of the battery cell module and the bent pipe.

[0007] As a preferred embodiment, the height of the curved pipe is the same as the depth of the groove, and the width of the curved pipe is smaller than the width of the groove; the curved pipe is a serpentine curved pipe.

[0008] As a preferred embodiment, a first tube is provided at one end of the bent pipe, and a second tube is provided at the other end; one end of the first tube passes through the heat transfer plate to be connected with the bent pipe, and the other end passes through one end of the box body to extend outward; one end of the second tube passes through the heat transfer plate to be connected with the bent pipe, and the other end passes through one end of the box body to extend outward.

[0009] As a preferred embodiment, the first tube and the second tube are symmetrically arranged; the first tube and the second tube are both "L"-shaped tubes; the first tube is a water inlet pipe, and the second tube is a water outlet pipe.

[0010] As a preferred embodiment, the box body includes a first end plate, a second end plate, a first side plate and a second side plate; the first side plate and the second side plate are respectively arranged on both sides of the reinforcing plate, and the first end plate and the second end plate are respectively arranged at both ends of the reinforcing plate; one end of the first side plate is fixedly connected to the first end plate, and the other end is connected to the second end plate; one end of the second side plate is fixedly connected to the first end plate, and the other end is connected to the second end plate.

[0011] As a preferred embodiment, the first tube extends outward through the first end plate, and the second tube extends outward through the first end plate; a cooling fan is provided on one side of the first end plate, and the cooling fan is provided adjacent to the second tube.

[0012] As a preferred embodiment, the battery cell module includes a plurality of module units arranged in parallel, and a first U-shaped spacer is arranged between adjacent module units, and the first U-shaped spacer is respectively abutted against the adjacent module units, the first side plate, the second side plate, and the heat transfer plate.

[0013] As a preferred embodiment, the first U-shaped spacer includes a first U-shaped mica sheet and a first phase change heat sink that are arranged in abutment with each other, and the first U-shaped mica sheet is circumferentially arranged on the outer side of the first phase change heat sink.

[0014] As a preferred embodiment, the length of the first U-shaped mica sheet is the same as the length of the module unit, and the height of the first U-shaped mica sheet is the same as the height of the module unit.

[0015] As a preferred embodiment, each of the module units includes a plurality of battery cells arranged in parallel; in the same module unit, a second U-shaped spacer is arranged between adjacent battery cells.

[0016] As a preferred embodiment, each of the second U-shaped spacers is disposed in contact with the adjacent first U-shaped spacers, the adjacent battery cells, and the heat transfer plate.

[0017] As a preferred embodiment, the length of the second U-shaped spacer is the same as the length of the battery cell, and the height of the second U-shaped spacer is the same as the height of the battery cell.

[0018] As a preferred embodiment, the second U-shaped spacer includes a second U-shaped mica sheet and a second phase change heat sink that are abutted against each other, and the second U-shaped mica sheet is circumferentially arranged on the outer side of the second phase change heat sink.

[0019] As a preferred embodiment, a fixing belt is provided on the outer side of the battery cell module, and the fixing belt is sleeved on the lower part of the battery cell module.

[0020] The technical solution proposed by the present invention has the following beneficial effects: the present application can realize rapid cooling of the battery cell module by liquid cooling by setting a liquid cooling bottom plate assembly on the bottom surface of the box. The cooling effect is good and the space occupied is small, which greatly reduces the requirements for product space and airtightness, facilitates later maintenance, and has low later maintenance costs. In addition, by setting the first U-shaped spacer and the second U-shaped spacer, the heat generated by the battery cell and the module unit can be quickly diverted to the heat transfer plate and the box (aluminum alloy box) to achieve rapid heat dissipation. By respectively contacting the first U-shaped spacer and the second U-shaped spacer with the heat transfer plate, the entire battery box structure forms a good heat dissipation network, which can better dissipate heat for each battery cell (especially the battery cell in the middle of the module unit), with fast heat dissipation speed and good heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a battery box structure with liquid cooling and heat dissipation according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the liquid-cooled battery box structure;

[0023] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the liquid cooling base plate assembly;

[0024] Figure 4 for Figure 2 Schematic diagram of the partial structure of the battery cell module. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, 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 intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] In the case where the module space is compact and no effective air duct is formed, the present application can quickly cool down the battery cell (especially the battery cell in the middle of the module) by combining the liquid cooling bottom plate assembly, the first U-shaped spacer and the second U-shaped spacer, so that the heat of the battery cell can be quickly transferred to the liquid cooling bottom plate assembly and the box (aluminum alloy box), thereby effectively extending the service life of the battery cell. The present invention has a simple structure, good heat dissipation effect, convenient disassembly and assembly, easy maintenance, good stability, economical, safe and practical, and can well meet the needs of actual use.

[0031] like Figures 1 to 4 As shown, an embodiment of the present invention provides a liquid-cooled battery box structure, comprising a cover plate 10, a box body 20 and a battery cell module 30; the battery cell module 30 is arranged in the box body 20, and the cover plate 10 covers the top of the box body 20;

[0032] The box body 20 includes a box body 21 and a liquid-cooled bottom plate assembly 22 arranged on the bottom surface of the box body 21; the liquid-cooled bottom plate assembly 22 includes a heat transfer plate 221, a bent pipe 222 and a reinforcing plate 223; the reinforcing plate 223 is provided with a groove 2231 adapted to the bent pipe 222 on the side surface close to the heat transfer plate 221, and the bent pipe 222 is arranged in the groove 2231; the heat transfer plate 221 is arranged on the reinforcing plate 223, and the heat transfer plate 221 is respectively arranged to abut the bottom surface of the battery cell module 30 and the bent pipe 222.

[0033] In the embodiment of the present application, the heat transfer plate is an aluminum heat transfer plate, the bent pipe is an aluminum bent pipe, and the reinforcing plate is a sheet metal reinforcing plate. In this way, cooling is performed through a liquid cooling base plate assembly, with good cooling effect and small space occupation, which greatly reduces the requirements for product space and airtightness, facilitates later maintenance, and has low later maintenance costs.

[0034] As a preferred embodiment, the height of the elbow 222 is the same as the depth of the groove 2231, and the width of the elbow 222 is smaller than the width of the groove 2231; the elbow 222 is a serpentine elbow. This arrangement can not only ensure the stable fixation of the elbow, effectively save the box space, but also achieve the maximum cooling area for the battery module (by controlling the width difference between the elbow and the groove and controlling the shape of the elbow to achieve the maximum cooling area), ensuring the cooling effect.

[0035] As a preferred embodiment, a first tube 40 is provided at one end of the curved tube 222, and a second tube 50 is provided at the other end; one end of the first tube 40 passes through the heat transfer plate 221 and is connected to the curved tube 222, and the other end passes through one end of the box body 21 and extends outward; one end of the second tube 50 passes through the heat transfer plate 221 and is connected to the curved tube 222, and the other end passes through one end of the box body 21 and extends outward.

[0036] As a preferred embodiment, the first tube 40 and the second tube 50 are symmetrically arranged; the first tube 40 and the second tube 50 are both "L"-shaped tubes; the first tube 40 is a water inlet pipe, and the second tube 50 is a water outlet pipe.

[0037] As a preferred embodiment, the box body 21 includes a first end plate 211, a second end plate 212, a first side plate 213 and a second side plate 214; the first side plate 213 and the second side plate 214 are respectively arranged on both sides of the reinforcing plate 223, and the first end plate 211 and the second end plate 212 are respectively arranged at both ends of the reinforcing plate 223; one end of the first side plate 213 is fixedly connected to the first end plate 211, and the other end is connected to the second end plate 212; one end of the second side plate 214 is fixedly connected to the first end plate 211, and the other end is connected to the second end plate 212.

[0038] As a preferred embodiment, the first tube 40 extends outward through the first end plate 211, and the second tube 50 extends outward through the first end plate 211; a cooling fan 60 is provided on one side of the first end plate 211, and the cooling fan 60 is arranged adjacent to the second tube 50.

[0039] As a preferred embodiment, the battery cell module 30 includes a plurality of module units 31 arranged in parallel, and a first U-shaped spacer 70 is arranged between adjacent module units 31, and the first U-shaped spacer 70 is respectively abutted against the adjacent module units 31, the first side plate 213, the second side plate 214, and the heat transfer plate 221.

[0040] As a preferred embodiment, the first U-shaped spacer 70 includes a first U-shaped mica sheet 71 and a first phase change heat sink 72 that are arranged in abutment with each other, and the first U-shaped mica sheet 71 is circumferentially arranged on the outer side of the first phase change heat sink 72 .

[0041] As a preferred embodiment, the length of the first U-shaped mica sheet 71 is the same as the length of the module unit 31, and the height of the first U-shaped mica sheet 71 is the same as the height of the module unit 31. In this way, both insulation can be effectively guaranteed and rapid cooling of the module unit can be achieved. Among them, the U-shaped mica sheet plays an insulating role; when the temperature of the module unit reaches 37°C during the discharge process, the phase change heat sink begins to absorb heat from the module unit, slowing down the temperature rise of the module unit during the high-rate discharge process, and controlling the temperature of the module unit within 50°C.

[0042] As a preferred embodiment, each module unit 31 includes a plurality of parallel battery cells 311; in the same module unit 31, a second U-shaped spacer 80 is disposed between adjacent battery cells 311. The outer shell of the battery cell 311 is a plastic shell, which has good insulation effect, safety and reliability.

[0043] As a preferred embodiment, each of the second U-shaped spacers 80 is respectively disposed in contact with the adjacent first U-shaped spacers 70, the adjacent battery cells 311, and the heat transfer plate 221. This arrangement can effectively ensure insulation and form a good heat dissipation network for the entire battery box structure, which can dissipate heat well for each battery cell (especially the battery cell in the middle of the module unit), achieve rapid cooling of the battery cell, and have a good heat dissipation effect.

[0044] As a preferred embodiment, the length of the second U-shaped spacer 80 is the same as the length of the battery cell 311, and the height of the second U-shaped spacer 80 is the same as the height of the battery cell 311. In this way, the insulation can be effectively guaranteed and the battery cell can be quickly cooled.

[0045] As a preferred embodiment, the second U-shaped spacer 80 includes a second U-shaped mica sheet 81 and a second phase-change heat sink 82 that are arranged in abutment with each other, and the second U-shaped mica sheet 81 is circumferentially arranged outside the second phase-change heat sink 82. In this way, the U-shaped mica sheet plays an insulating role; when the temperature of the battery cell reaches 37°C during the discharge process, the phase-change heat sink begins to absorb heat from the battery cell, slowing down the temperature rise of the battery cell during high-rate discharge, and controlling the temperature of the battery cell within 50°C.

[0046] As a preferred embodiment, a fixing belt (not marked in the figure) is provided on the outside of the battery module 30, and the fixing belt is sleeved on the lower part of the battery module. This arrangement can effectively fasten the battery module, and at the same time can reduce the space occupied by fastening, effectively reducing the overall size of the battery pack at the same capacity, and also effectively ensuring the consistency of the module unit during high-rate discharge. The structure of the present application can be placed upright, matching the structure of the battery cell monomer, avoiding the risk of short circuit due to leakage.

[0047] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A liquid-cooled battery box structure, characterized in that: It includes a cover plate, a box body and a battery module; the battery module is arranged in the box body, and the cover plate is covered on the top of the box body; The box body includes a box body body and a liquid-cooled bottom plate assembly arranged on the bottom surface of the box body; the liquid-cooled bottom plate assembly includes a heat transfer plate, a bent pipe and a reinforcing plate; a groove adapted to the bent pipe is arranged on the side of the reinforcing plate close to the heat transfer plate, and the bent pipe is arranged in the groove; the heat transfer plate is arranged on the reinforcing plate, and the heat transfer plate is respectively arranged to abut the bottom surface of the battery cell module and the bent pipe.

2. The liquid-cooled battery box structure according to claim 1, characterized in that: The height of the curved pipe is the same as the depth of the groove, and the width of the curved pipe is smaller than the width of the groove; the curved pipe is a serpentine curved pipe.

3. The liquid-cooled battery box structure according to claim 1, characterized in that: A first tube is provided at one end of the bent pipe, and a second tube is provided at the other end; one end of the first tube passes through the heat transfer plate to be connected with the bent pipe, and the other end passes through one end of the box body to extend outward; one end of the second tube passes through the heat transfer plate to be connected with the bent pipe, and the other end passes through one end of the box body to extend outward.

4. The liquid-cooled battery box structure according to claim 3 is characterized in that: The first tube and the second tube are symmetrically arranged; the first tube and the second tube are both "L"-shaped tubes; the first tube is a water inlet pipe, and the second tube is a water outlet pipe.

5. The liquid-cooled battery box structure according to claim 3, characterized in that: The box body includes a first end plate, a second end plate, a first side plate and a second side plate; the first side plate and the second side plate are respectively arranged on both sides of the reinforcing plate, and the first end plate and the second end plate are respectively arranged at both ends of the reinforcing plate; one end of the first side plate is fixedly connected to the first end plate, and the other end is connected to the second end plate; one end of the second side plate is fixedly connected to the first end plate, and the other end is connected to the second end plate; The first tube extends outward through the first end plate, and the second tube extends outward through the first end plate; a cooling fan is arranged on one side of the first end plate, and the cooling fan is arranged adjacent to the second tube.

6. The liquid-cooled battery box structure according to claim 5, characterized in that: The battery cell module includes a plurality of module units arranged in parallel, and a first U-shaped spacer is arranged between adjacent module units, and the first U-shaped spacer is respectively abutted against the adjacent module units, the first side plate, the second side plate, and the heat transfer plate.

7. The liquid-cooled battery box structure according to claim 6, characterized in that: The first U-shaped spacer comprises a first U-shaped mica sheet and a first phase change heat sink that are arranged in abutment with each other, and the first U-shaped mica sheet is circumferentially arranged on the outer side of the first phase change heat sink; The length of the first U-shaped mica sheet is the same as the length of the module unit, and the height of the first U-shaped mica sheet is the same as the height of the module unit.

8. The liquid-cooled battery box structure according to claim 7, characterized in that: Each of the module units comprises a plurality of battery cells arranged in parallel; in the same module unit, a second U-shaped spacer is arranged between adjacent battery cells.

9. The liquid-cooled battery box structure according to claim 8, characterized in that: Each of the second U-shaped spacers is respectively disposed in contact with the adjacent first U-shaped spacers, the adjacent battery cells, and the heat transfer plate; The length of the second U-shaped spacer is the same as the length of the battery cell, and the height of the second U-shaped spacer is the same as the height of the battery cell.

10. The liquid-cooled battery box structure according to claim 8, characterized in that: The second U-shaped spacer comprises a second U-shaped mica sheet and a second phase change heat sink that are arranged in abutment with each other, and the second U-shaped mica sheet is circumferentially arranged on the outer side of the second phase change heat sink; A fixing belt is arranged on the outer side of the battery core module, and the fixing belt is sleeved on the lower part of the battery core module.

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