A battery module and control method for high-rate charging and discharging liquid cooling

Abstract

The present invention discloses a battery module and control method for liquid cooling and heat dissipation for high-rate charge and discharge, wherein the battery module comprises a battery assembly, which comprises a plurality of batteries arranged in a matrix; a liquid cooling and heat dissipation assembly arranged at intervals in the battery assembly; a plurality of aluminum bars electrically connecting two adjacent batteries respectively; at least one fastening assembly fixedly arranged on the side of the battery assembly; two protective plates relatively arranged on both sides of the battery assembly and fixedly connected to the fastening assembly; the liquid cooling and heat dissipation assembly comprises a liquid inlet pipe and a connecting pipe relatively arranged on both sides of the battery assembly; a plurality of plastic flow plates respectively arranged to be connected to the liquid inlet pipe and the connecting pipe at both ends; and a liquid return pipe connected to the connecting pipe. By arranging the liquid cooling and heat dissipation assembly, the present invention effectively solves the problem that the heat dissipation performance of the existing battery module generally cannot meet the requirements of high-rate charge and discharge.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a battery module and a control method for high-rate charging and discharging liquid cooling. Background Art

[0002] The current energy storage market is still dominated by traditional liquid-cooled battery modules. Generally, the structure of a liquid-cooled battery module is mainly composed of batteries, thermally conductive structural adhesives, water-cooled plates and other auxiliary components. The heat generated by the battery cells during the charging and discharging process is transferred from the bottom of the battery cells to the thermally conductive structural adhesive, and then transferred from the thermally conductive structural adhesive to the surface of the water-cooled plate. The surface of the water-cooled plate transfers the heat to the coolant in the flow channel of the water-cooled plate. The coolant absorbs the heat from the battery and is heated. The heated coolant carries the heat out at a certain speed, achieving the purpose of heat dissipation for the battery. However, the existing liquid-cooled battery modules can only achieve low energy density or low rate charge and discharge conditions, and cannot meet the high rate charge and discharge requirements; secondly, the existing liquid-cooled battery modules have a relatively complex heat conduction path. The heat generated by the battery cells needs to be conducted in turn through the thermally conductive structural adhesive with large thermal resistance and the water-cooled plate panel. There are multiple levels of contact surfaces, the cumulative thermal resistance is large, and the thermal conductivity is low. At the same time, the thermally conductive structural adhesive is also prone to bubbles in the process, and the thermal conductivity decays over time, which aggravates the increase in thermal resistance. There will be a large temperature difference between the battery cells and high temperature, which will cause a series of safety risks. In addition, the cost of the existing liquid-cooled battery module is high and cannot meet the market's demand for high cost performance. The water-cooled plate is made of aluminum alloy. On the one hand, it increases the weight of the liquid-cooled battery module, causing the energy storage container to bear a greater risk of stress fatigue loss, and also aggravates the vibration inertia during transportation; on the other hand, it also increases the risk of short circuit with the battery; therefore, a battery module and control method for high rate charge and discharge liquid cooling heat dissipation are provided to solve the above problems. Summary of the invention

[0003] One of the purposes of the present invention is to provide a battery module and a control method for liquid cooling and heat dissipation for high-rate charge and discharge, so as to solve the problem that the heat dissipation performance of existing battery modules generally cannot meet the requirements of high-rate charge and discharge.

[0004] A battery module and control method for high-rate charge-discharge liquid cooling and heat dissipation of the present invention can be implemented by the following technical solutions:

[0005] A battery module for high-rate charge-discharge liquid cooling and heat dissipation of the present invention comprises: a battery assembly, which comprises a plurality of batteries arranged in a matrix, and a gap is provided between the long side surfaces of two adjacent batteries; a liquid cooling and heat dissipation assembly, which is arranged in the battery assembly at intervals, and the liquid cooling and heat dissipation assembly performs liquid cooling and heat dissipation operations on the battery assembly; a plurality of aluminum bars, which are respectively electrically connected to two adjacent batteries; at least one fastening assembly, which is fixedly arranged on the side of the battery assembly; two protective plates, which are arranged on both sides of the battery assembly opposite to each other and fixedly connected to the fastening assembly;

[0006] Among them, the liquid cooling and heat dissipation component includes a liquid inlet pipe and a connecting pipe relatively arranged on both sides of the battery assembly, both of which are hollow pipes; a plurality of plastic flow plates respectively connected to the liquid inlet pipe and the connecting pipe at both ends, which are arranged at intervals in the battery assembly and are respectively tightly contacted and connected with the corresponding long side surfaces of the battery; a liquid return pipe connected to the connecting pipe, which performs a reflux operation on the coolant in the connecting pipe.

[0007] In one embodiment, a liquid inlet interface is provided at one end of the liquid inlet pipe, which is detachably connected to an external coolant pipeline joint; the other end of the liquid inlet pipe is connected to the plastic flow plate using a tapered self-sealing interface.

[0008] In one embodiment, a condensation sensing layer is sprayed on the outer surface of the liquid inlet pipe or the liquid inlet interface; and a micro-pressure sensing film is wrapped on the surface of the condensation sensing layer.

[0009] In one embodiment, the plastic flow plate includes a flow channel plate body, which is a flat streamlined thin-walled shell, and a plurality of narrow flow channels for uniform flow are arranged in the flow channel plate body; the liquid inlet port and the liquid outlet port arranged at both ends of the flow channel plate body are respectively connected, the liquid inlet port is connected to the liquid inlet pipe, and the liquid outlet port is connected to the connecting pipe, and the coolant in the liquid inlet pipe is evenly distributed to the plurality of narrow flow channels through the liquid inlet port.

[0010] In one embodiment, the liquid inlet port and the liquid outlet port are respectively welded to two ends of the flow channel plate body by melting.

[0011] In one embodiment, a plurality of high-strength pressure-bearing ribs are arranged between adjacent narrow flow channels.

[0012] In one embodiment, the wall thickness of the flow channel plate body and the battery is less than 0.5 mm.

[0013] In one embodiment, the fastening assembly includes two mounting side plates arranged opposite to each other at the sides of the battery assembly; and a strap fastened around the two mounting side plates.

[0014] In one embodiment, a groove is provided on the mounting side plate, and the strap limiter is provided in the groove; arc chamfers are provided on both sides of the groove.

[0015] The present invention provides a control method for high-rate charge-discharge liquid cooling and heat dissipation, which is applied to any of the battery modules described above, and comprises the following steps:

[0016] S1, the battery module is powered on, and the BMS control system collects the real-time temperature Tc of the battery assembly, the real-time pressure P of the micro-pressure sensing membrane, and the module water inlet temperature Tin, respectively, to confirm that the parameter collection process is normal;

[0017] S2, when the battery assembly starts high-rate cycle charge and discharge, and the module water inlet temperature Tin≤20℃, during the high-rate charge and discharge process, if the BMS control system collects the real-time temperature Tc≥40℃ of the battery assembly, and the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P2 of the micro-pressure-sensitive membrane when obvious condensation appears on the liquid inlet pipe, then the BMS control system issues an instruction to the water cooling unit to adjust the module water inlet temperature, that is, 23℃≥Tin>20℃. At this time, the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P1 of the micro-pressure-sensitive membrane when no obvious condensation appears on the liquid inlet pipe. At the same time, the BMS control system issues an instruction for the battery assembly to switch from high-rate cycle charge and discharge to medium-rate cycle charge and discharge;

[0018] S3, when the battery assembly is in medium-rate cycle charge and discharge, and the module inlet water temperature is 23℃≥Tin>20℃, during the medium-rate charge and discharge process, if the BMS control system collects the real-time temperature of the battery assembly of 30℃≤Tc<40℃, and the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P1 of the micro-pressure-sensitive membrane when no obvious condensation appears on the inlet pipe, then the BMS control system issues an instruction to the water cooling unit to adjust the module inlet water temperature, that is, 25℃≥Tin>23℃. At this time, the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P0 of the micro-pressure-sensitive membrane when there is no condensation on the inlet pipe. At the same time, the BMS control system issues an instruction to switch the battery assembly from medium-rate cycle charge and discharge to low-rate cycle charge and discharge;

[0019] S4, when the battery assembly is in low-rate cycle charge and discharge, and the module water inlet temperature Tin ≥ 25 ° C, during the low-rate charge and discharge process, if the BMS control system collects the real-time temperature of the battery assembly -10 ° C ≤ Tc < 30 ° C, and the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P0 of the micro-pressure-sensitive membrane when there is no condensation in the liquid inlet pipe, then the BMS control system issues an instruction to the water cooling unit to adjust the module water inlet temperature, that is, Tin ≤ 20 ° C. At this time, the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P0 of the micro-pressure-sensitive membrane when there is no condensation in the liquid inlet pipe. At the same time, the BMS control system issues an instruction for the battery assembly to switch from low-rate cycle charge and discharge to high-rate cycle charge and discharge;

[0020] S5, when the BMS control system collects the real-time temperature of the battery assembly Tc≤-10℃, the BMS control system issues a command to stop the cycle charge and discharge of the battery assembly, and at the same time, the module inlet water temperature Tin≥25℃ to heat the battery assembly. When the real-time temperature of the battery assembly Tc>-10℃, the BMS issues a command to switch the battery assembly from low-rate cycle charge and discharge to high-rate cycle charge and discharge.

[0021] Compared with the prior art, the battery module and control method for high-rate charge-discharge liquid cooling and heat dissipation of the present invention have the following beneficial effects:

[0022] In the battery module and control method for high-rate charging and discharging liquid cooling, the coolant of the water-cooling unit is refluxed to the circulation flow channel in the water-cooling unit through the liquid inlet pipe, the plastic flow plate, the connecting pipe and the reflux pipe in turn, and at the same time, a plurality of flow channels with equal flow are arranged in the plastic flow plate and are respectively tightly connected with the long side surfaces of the battery, which can effectively meet the high-rate charging and discharging conditions and solve the problem that the heat dissipation performance of the existing battery module generally cannot meet the high-rate charging and discharging requirements; the two long side surfaces of the battery are directly tightly connected with the flat thin-walled plastic flow plate, so that the heat conduction path is direct and single, the thermal resistance is low, and the heat dissipation efficiency is high; the plastic flow plate is used to directly perform liquid cooling on the two long side surfaces of the battery, the heat dissipation surface is large, and the heat dissipation surface is the main heating surface of the battery, and the temperature difference between the upper and lower parts of a single battery is extremely low; the plastic flow plate adopts a plurality of groups of flow channels with equal flow in parallel , so that the flow resistance of the coolant is small; by setting the condensation sensing layer and the micro-pressure sensing membrane, the liquid inlet temperature can be controlled above the condensation temperature, thus eliminating the generation of condensation; by adopting the method of multiple sets of flow channels directly attached to the long side of the battery, a battery failure can be directly disassembled and replaced, and the maintainability is high; due to the high heat dissipation efficiency of the battery module, the temperature of the battery is always controlled at a low temperature, the charging and discharging process does not need to be stationary, and it can be continuously cycled for a long time, the cycle charging and discharging time is short, and the charging and discharging efficiency is high; the components in the liquid cooling heat dissipation assembly are all made of non-metallic materials, which reduces the risk of short circuit between the battery and the metal, and the overall weight of the plastic flow channel is light, which reduces the fatigue loss risk of the module load-bearing parts and the vibration inertia during transportation, effectively eliminating the deformation risk of the load-bearing parts, and the use of plastic flow channels reduces costs and improves cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of a battery module used for high-rate charge-discharge liquid cooling and heat dissipation of the present invention;

[0025] Figure 2 yes Figure 1 The longitudinal cross-sectional structure schematic diagram of a battery module used for high-rate charge-discharge liquid cooling and heat dissipation of the present invention is shown;

[0026] Figure 3 yes Figure 1 The schematic diagram of the transverse cross-sectional structure of a battery module for high-rate charge-discharge liquid cooling and heat dissipation of the present invention is shown;

[0027] Figure 4 yes Figure 1 The exploded structural schematic diagram of a battery module for high-rate charge-discharge liquid cooling and heat dissipation of the present invention is shown, including a liquid cooling component and a mounting side plate;

[0028] Figure 5 yes Figure 4 The schematic diagram of the structure of the liquid cooling assembly shown includes a plastic flow plate and a liquid inlet nozzle;

[0029] Figure 6 yes Figure 5 A schematic diagram of the longitudinal cross-sectional structure of the plastic flow plate shown;

[0030] Figure 7 yes Figure 5 A schematic diagram of the longitudinal cross-sectional structure of the liquid inlet nozzle shown;

[0031] Figure 8 yes Figure 4 The structural schematic diagram of the side panel installation is shown;

[0032] Fig. 9 It is a flow chart of a control method for high-rate charge-discharge liquid cooling and heat dissipation of the present invention.

[0033] Markings in the figure: 10, battery module; 11, battery assembly; 111, battery; 12, liquid cooling assembly; 121, liquid inlet pipe; 1211, liquid inlet interface; 122, connecting pipe; 123, plastic flow plate; 1231, flow channel plate body; 12311, narrow flow channel; 1232, liquid inlet port; 1233, liquid outlet port; 124, liquid return pipe; 1241, liquid return interface; 13, aluminum row; 14, fastening assembly; 141, mounting side panel; 1411, groove; 1412, arc chamfer; 1413, fixing hole; 142, strap; 15, protective plate; 16, condensation sensing layer; 17, micro-pressure sensing film. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0036] See also Figure 1-Figure 4 As shown, a battery module 10 for high-rate charge and discharge liquid cooling and heat dissipation of the present invention includes a battery assembly 11, a liquid cooling and heat dissipation assembly 12, a plurality of aluminum bars 13, at least one fastening assembly 14 and two protective plates 15; the battery assembly 11 includes a plurality of batteries 111, and the plurality of batteries 111 are arranged in a matrix, and a gap is provided between the long side surfaces of two adjacent batteries 111; the liquid cooling and heat dissipation assembly 12 is arranged at intervals in the battery assembly 11, and liquid cooling and heat dissipation operations are performed on the long side surfaces of the plurality of batteries 111 in the battery assembly 11 respectively; the plurality of aluminum bars 13 are electrically connected to two adjacent batteries 111 respectively, so as to perform series-parallel operations on the plurality of batteries 111; the fastening assembly 14 is fixedly arranged on the side of the battery assembly 11, and fastens the battery assembly 11 and the liquid cooling and heat dissipation assembly 12; the two protective plates 15 are respectively arranged on both sides of the battery assembly 11 and fixedly connected to the fastening assembly 14, and protect the battery assembly 11.

[0037] See also Figure 1-Figure 4 As shown, in this embodiment, the battery 111 is a rectangular hard-pack battery cell, whose shell is made of aluminum alloy, and the surface of the aluminum alloy is wrapped with a layer of insulating and wear-resistant blue film; the charging and discharging operations are performed by the positive and negative pole ears arranged at the upper end of the battery 111, and the temperature, current, voltage and internal resistance parameters of the battery 111 can be collected.

[0038] See also Figure 1-Figure 5 As shown, in this embodiment, the liquid cooling heat dissipation component 12 includes a liquid inlet pipe 121, a connecting pipe 122, a plurality of plastic flow plates 123 and a liquid return pipe 124; the liquid inlet pipe 121 and the connecting pipe 122 are both hollow pipes, which are relatively arranged on both sides of the battery assembly 11, and the liquid inlet pipe 121 is connected with the external cooling liquid pipeline so that the cooling liquid enters the liquid inlet pipe 121 through the connecting pipe; the two ends of the plurality of plastic flow plates 123 are respectively connected with the liquid inlet pipe 121 and the connecting pipe 122, which are arranged at intervals in the battery assembly 11 and are respectively tightly contacted with the long side surfaces of the corresponding batteries 111, and the cooling liquid in the liquid inlet pipe 121 flows into the connecting pipe 122 through the plurality of plastic flow plates 123, and the cooling liquid flowing through the plastic flow plates 123 takes away the heat generated by the battery 111; the liquid return pipe 124 is connected with the connecting pipe 122, and it performs a reflux operation on the cooling liquid in the connecting pipe 122.

[0039] See also Figure 5 and Figure 7As shown, in the present embodiment, the liquid inlet pipe 121 is made of a composite plastic material, which has the characteristics of high strength, good toughness, corrosion resistance, high temperature resistance and flame retardancy; a liquid inlet interface 1211 is provided at one end of the liquid inlet pipe 121, which is detachably connected to the external coolant pipeline joint, and the other end of the liquid inlet pipe 121 is connected to the plastic flow plate 123 by a tapered self-sealing interface. The greater the internal pressure of the liquid inlet pipe 121, the stronger the tightness of the tapered self-sealing interface, and the better the leakage prevention. Specifically, a condensation sensing layer 16 is sprayed on the outer surface of the liquid inlet pipe 121 or the liquid inlet interface 1211, which senses condensation on the surface of the liquid inlet pipe 121 or the liquid inlet interface 1211. The more severe the condensation, the greater the expansion amplitude of the condensation sensing layer 16, and the greater the pressure it generates. After the condensation disappears, the condensation sensing layer 16 can return to its initial state; the surface of the condensation sensing layer 16 is wrapped with a micro-pressure sensing film 17, which is sensitive to pressure and stable and high-precision. It will generate pressure as the volume of the condensation sensing layer 16 expands. The micro-pressure sensing film 17 collects pressure signals, and then connects to the BMS for communication through a communication line to transmit the pressure signals to the BMS.

[0040] See also Figure 5 As shown, in this embodiment, the connecting pipe 122 is also made of composite plastic material, which has the characteristics of high strength, good toughness, corrosion resistance, high temperature resistance and flame retardancy; the connecting pipe 122 adopts a tapered self-sealing interface to be connected with multiple plastic flow plates 123 and the return pipe 124 respectively, so that the coolant flowing through the multiple plastic flow plates 123 can be returned to the return pipe 124 through the connecting pipe 122 for circulation operation.

[0041] See also Figure 5 and Figure 6As shown, in this embodiment, the plastic flow plate 123 includes a flow channel plate body 1231, a liquid inlet port 1232 and a liquid outlet port 1233; the flow channel plate body 1231 is a streamlined thin-walled shell, in which a plurality of narrow flow channels 12311 for equal flow are arranged, and the uniformity of the internal fluid velocity, pressure and temperature can be controlled by the equal flow design of the narrow flow channels 12311; the liquid inlet port 1232 and the liquid outlet port 1233 are respectively connected and arranged at both ends of the flow channel plate body 1231, the liquid inlet port 1232 is connected and arranged with the liquid inlet pipe 121, and the liquid outlet port 1233 is connected and arranged with the connecting pipe 122, and the coolant in the liquid inlet pipe 121 is evenly distributed to the plurality of narrow flow channels 12311 through the liquid inlet port 1232. Specifically, the flow channel plate body 1231 is made of composite plastic material, which has the characteristics of high strength, good toughness, corrosion resistance, high thermal conductivity, high temperature resistance, fire resistance, flame retardancy, insulation and good welding performance. The liquid inlet port 1232 and the liquid outlet port 1233 are respectively welded to the two ends of the flow channel plate body 1231 by melting, thereby forming a highly sealed plastic welding area, so that the internal cavity of the flow channel plate body 1231 has the characteristic of high pressure resistance; a plurality of high-strength pressure-bearing ribs are arranged between adjacent narrow flow channels 12311 for isolation, and the plurality of pressure-bearing ribs can withstand huge extrusion pressure without deformation.

[0042] Specifically, the flow channel plate body 1231 is flat and streamlined, and its width is 20 times its thickness. The flat side of the flow channel plate body 1231 and the long side of the corresponding battery 111 are tightly fitted and connected to each other through the extrusion force of the fastening assembly 14. The wall thickness of the flow channel plate body 1231 and the battery 111 is less than 0.5 mm. The high thermal conductivity coefficient and thin-walled design of the flow channel plate body 1231 make the thermal resistance value of the heat generated by the battery 111 transferred to the flow channel plate body 1231 almost zero, and the thermal conductivity efficiency is extremely high. When the battery 111 thermally runs away, the flow channel wall of the flow channel plate body 1231 will be melted by the high temperature of the thermally runaway battery 111, and the coolant in the flow channel plate body 1231 will directly spray the surface of the battery 111 to achieve battery-level fire-fighting auxiliary functions. Specifically, the welding part of the liquid inlet port 1232 and the flow channel plate body 1231 is flat, and the connecting part with the liquid inlet pipe 121 is pipe-shaped. A plurality of water inlet channels for uniform flow are designed inside the flat end of the liquid inlet port 1232. The plurality of water inlet channels are respectively connected to the corresponding narrow channels 12311. The coolant in the liquid inlet pipe 121 flows evenly into the plurality of narrow channels 12311 arranged in the flow channel plate body 1231 through the plurality of water inlet channels arranged at the flat end of the liquid inlet port 1232. The structure of the liquid outlet port 1233 is similar to that of the liquid inlet port 1232, so its specific structure is not repeated here.

[0043] See also Figure 1 and Figure 5As shown, in this embodiment, the return liquid pipe 124 is also made of composite plastic material, which has the characteristics of high strength, good toughness, corrosion resistance, high temperature resistance and flame retardancy; a return liquid interface 1241 is provided at one end of the return liquid pipe 124, which is detachably connected to the external coolant return pipe joint, and the other end of the return liquid pipe 124 is connected to the water outlet port of the connecting pipe 122 by a tapered self-sealing interface.

[0044] See also Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the aluminum bar 13 electrically connects the positive and negative electrodes of two adjacent batteries 111 together to achieve series-parallel operation between multiple batteries 111; the material of the aluminum bar 13 is 6060-O material, which has a smooth surface and has great strength and high-precision flatness. The temperature, current, voltage, and internal resistance parameters of the battery 111 can be directly collected on the corresponding aluminum bar 13.

[0045] See also Figure 1 , Figure 4 and Figure 8 As shown, in the present embodiment, two fastening components 14 are respectively fastened around the upper and lower sides of the battery assembly 11, so that the flow channel plate main body 1231 is tightly fitted with the corresponding battery 111; the fastening component 14 includes two mounting side plates 141 and a strap 142, the two mounting side plates 141 are relatively arranged on the sides of the battery assembly 11, and the mounting side plates 141 are made of a high-strength, insulating, high-temperature resistant and corrosion-resistant composite polymer material; the strap 142 is fastened around the two mounting side plates 141, and the material used is plastic steel, which has insulation, high strength, fire resistance and certain plasticity. Specifically, a groove 1411 is provided on the mounting side panel 141, and the strap 142 is matched and arranged in the groove 1411. The groove 1411 limits the strap 142, and arc chamfers 1412 are provided on both sides of the groove 141, respectively, to facilitate the strap 142 to tighten and bind the mounting side panel 141; a plurality of fixing holes 1413 are provided on the side of the mounting side panel 141, to facilitate fixing the two protective plates 15 on the mounting side panel 141.

[0046] See also Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the protective plate 15 is made of a high-strength, insulating, high-temperature-resistant and corrosion-resistant composite polymer material, which is used to protect the battery assembly 11 and the multiple aluminum bars 13; multiple through holes are penetrated on both sides of the protective plate 15, and the positions of the multiple through holes correspond to the positions of the corresponding fixing holes 1413, respectively. The fastening screws pass through the through holes and are threadedly connected to the fixing holes 1413, so as to fix the protective plate 15 on the mounting side plate 141.

[0047] See also Fig. 9 As shown, the present invention is a control method for high-rate charge and discharge liquid cooling and heat dissipation, which is applied to any of the above-mentioned battery modules 10, and the battery module 10 is respectively connected to a water cooling unit of a low-temperature coolant and a BMS control system, and the specific steps include the following:

[0048] System defined values: set the real-time temperature of the battery module 10 to Tc, the module water inlet temperature to Tin, the pressure of the micro-pressure-sensitive membrane 17 when there is no condensation in the liquid inlet pipe 121 to P0, the pressure of the micro-pressure-sensitive membrane 17 when there is no obvious condensation in the liquid inlet pipe 121 to P1, and the pressure of the micro-pressure-sensitive membrane 17 when there is obvious condensation in the liquid inlet pipe 121 to P2;

[0049] S1, the battery module 10 is powered on, and the BMS control system collects the real-time temperature Tc of the battery assembly 11, the real-time pressure P of the micro-pressure sensing membrane 17, and the module water inlet temperature Tin, respectively, to confirm that the parameter collection process is normal;

[0050] S2, when the battery assembly 11 starts high-rate cyclic charge and discharge, and the module water inlet temperature Tin≤20°C, during the high-rate charge and discharge process, if the BMS control system collects the real-time temperature Tc≥40°C of the battery assembly 11, and the real-time pressure P of the micro-pressure sensing membrane 17=P2 (obvious condensation appears on the liquid inlet pipe 121), the BMS control system issues an instruction to the water cooling unit to adjust the module water inlet temperature, that is, 23°C≥Tin>20°C. At this time, the real-time pressure P of the micro-pressure sensing membrane 17=P1 (no obvious condensation appears on the liquid inlet pipe 121), and at the same time, the BMS control system issues an instruction to switch the battery assembly 11 from high-rate cyclic charge and discharge to medium-rate cyclic charge and discharge;

[0051] S3, when the battery assembly 11 is in the middle rate cycle charge and discharge, and the module water inlet temperature is 23℃≥Tin>20℃, during the middle rate charge and discharge process, if the BMS control system collects the real-time temperature of the battery assembly 11 of 30℃≤Tc<40℃, and the real-time pressure P of the micro-pressure sensitive membrane 17 is P1 (no obvious condensation appears on the liquid inlet pipe 121), then the BMS control system issues an instruction to the water cooling unit to adjust the module water inlet temperature, that is, 25℃≥Tin>23℃, at which time the real-time pressure P of the micro-pressure sensitive membrane 17 is P0 (no condensation appears on the liquid inlet pipe 121), and at the same time the BMS control system issues an instruction to switch the battery assembly 11 from the middle rate cycle charge and discharge to the low rate cycle charge and discharge;

[0052] S4, when the battery assembly 11 is in low-rate cycle charge and discharge, and the module water inlet temperature Tin ≥ 25°C, during the low-rate charge and discharge process, if the BMS control system collects the real-time temperature of the battery assembly 11 -10°C ≤ Tc < 30°C, and the real-time pressure P of the micro-pressure sensing membrane 17 = P0 (no condensation in the liquid inlet pipe 121), the BMS control system issues an instruction to the water cooling unit to adjust the module water inlet temperature, that is, Tin ≤ 20°C. At this time, the real-time pressure P of the micro-pressure sensing membrane 17 = P0 (no condensation in the liquid inlet pipe 121), and at the same time, the BMS control system issues an instruction to switch the battery assembly 11 from low-rate cycle charge and discharge to high-rate cycle charge and discharge;

[0053] S5, when the BMS control system collects the real-time temperature Tc≤-10℃ of the battery assembly 11, the BMS control system issues an instruction for the battery assembly 11 to stop cyclic charge and discharge, and at the same time, the module inlet water temperature Tin≥25℃ to heat the battery assembly 11; when the real-time temperature Tc of the battery assembly 11>-10℃, the BMS issues an instruction for the battery assembly 11 to switch from low-rate cyclic charge and discharge to high-rate cyclic charge and discharge.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery module for high-rate charge-discharge liquid cooling, characterized in that: include: A battery assembly comprising a plurality of batteries arranged in a matrix, with a gap being provided between the long sides of two adjacent batteries; A liquid cooling and heat dissipation component is arranged at intervals in the battery assembly, and the liquid cooling and heat dissipation component performs liquid cooling and heat dissipation operations on the battery assembly; A plurality of aluminum bars, each of which electrically connects two adjacent batteries; At least one fastening assembly, which is fixedly disposed on a side of the battery assembly; Two protective plates, which are arranged oppositely on two sides of the battery assembly and are fixedly connected to the fastening assembly; The liquid cooling and heat dissipation assembly includes a liquid inlet pipe and a connecting pipe arranged on both sides of the battery assembly, both of which are hollow pipes; a plurality of plastic flow plates respectively connected to the liquid inlet pipe and the connecting pipe at both ends, which are arranged in intervals in the battery assembly and are respectively closely connected to the long side surfaces of the corresponding batteries; a liquid return pipe connected to the connecting pipe, which performs a reflux operation on the coolant in the connecting pipe; Among them, one end of the liquid inlet pipe is provided with a liquid inlet interface, which is detachably connected to the external coolant pipeline joint; the other end of the liquid inlet pipe is connected to the corresponding plastic flow plate through a tapered self-sealing interface; Among them, a condensation sensing layer is sprayed on the outer surface of the liquid inlet pipe or the liquid inlet interface; the surface of the condensation sensing layer is wrapped with a micro-pressure sensing film; the condensation sensing layer senses condensation on the surface of the liquid inlet pipe or the liquid inlet interface, and the more severe the condensation is, the greater the expansion amplitude of the condensation sensing layer is, and the greater the pressure it generates is, and the condensation sensing layer returns to its initial state after the condensation disappears; the micro-pressure sensing film generates pressure and collects pressure signals as the volume of the condensation sensing layer expands, and then communicates with the BMS through a communication line to transmit the pressure signal to the BMS.

2. A battery module for high-rate charge-discharge liquid cooling and heat dissipation according to claim 1, characterized in that: The plastic flow plate includes a flow channel plate body, which is a flat streamlined thin-walled shell, and a plurality of narrow flow channels for uniform flow are arranged in the flow channel plate body; a liquid inlet port and a liquid outlet port are respectively connected to the two ends of the flow channel plate body, the liquid inlet port is connected to the liquid inlet pipe, and the liquid outlet port is connected to the connecting pipe, and the coolant in the liquid inlet pipe is evenly distributed to the plurality of narrow flow channels through the liquid inlet port.

3. A battery module for high-rate charge-discharge liquid cooling and heat dissipation according to claim 2, characterized in that: The liquid inlet port and the liquid outlet port are respectively welded to two ends of the flow channel plate body by melting.

4. A battery module for high-rate charge-discharge liquid cooling and heat dissipation according to claim 2, characterized in that: A plurality of high-strength pressure-bearing ribs are arranged between adjacent narrow flow channels.

5. A battery module for high-rate charge-discharge liquid cooling and heat dissipation according to claim 2, characterized in that: The thickness of the wall where the flow channel plate body and the battery are attached is less than 0.5 mm.

6. A battery module for high-rate charge-discharge liquid cooling and heat dissipation according to claim 1, characterized in that: The fastening assembly comprises two mounting side plates arranged opposite to each other at the sides of the battery assembly; and a strap arranged around and fastened on the two mounting side plates.

7. A battery module for high-rate charge-discharge liquid cooling and heat dissipation according to claim 6, characterized in that: The mounting side plate is provided with a groove, and the strap limiter is provided in the groove; arc chamfers are provided on both sides of the groove.

8. A control method for high-rate charge-discharge liquid cooling and heat dissipation, applied to the battery module according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, the battery module is powered on, and the BMS control system collects the real-time temperature Tc of the battery assembly, the real-time pressure P of the micro-pressure sensing membrane, and the module water inlet temperature Tin, respectively, to confirm that the parameter collection process is normal; S2, when the battery assembly starts high-rate cycle charge and discharge, and the module water inlet temperature Tin≤20℃, during the high-rate charge and discharge process, if the BMS control system collects the real-time temperature Tc≥40℃ of the battery assembly, and the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P2 of the micro-pressure-sensitive membrane when obvious condensation appears on the liquid inlet pipe, then the BMS control system issues an instruction to the water cooling unit to adjust the module water inlet temperature, that is, 23℃≥Tin>20℃. At this time, the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P1 of the micro-pressure-sensitive membrane when no obvious condensation appears on the liquid inlet pipe. At the same time, the BMS control system issues an instruction for the battery assembly to switch from high-rate cycle charge and discharge to medium-rate cycle charge and discharge; S3, when the battery assembly is in medium-rate cycle charge and discharge, and the module inlet water temperature is 23℃≥Tin>20℃, during the medium-rate charge and discharge process, if the BMS control system collects the real-time temperature of the battery assembly of 30℃≤Tc<40℃, and the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P1 of the micro-pressure-sensitive membrane when no obvious condensation appears on the inlet pipe, then the BMS control system issues an instruction to the water cooling unit to adjust the module inlet water temperature, that is, 25℃≥Tin>23℃. At this time, the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P0 of the micro-pressure-sensitive membrane when there is no condensation on the inlet pipe. At the same time, the BMS control system issues an instruction to switch the battery assembly from medium-rate cycle charge and discharge to low-rate cycle charge and discharge; S4, when the battery assembly is in low-rate cycle charge and discharge, and the module water inlet temperature Tin ≥ 25 ° C, during the low-rate charge and discharge process, if the BMS control system collects the real-time temperature of the battery assembly -10 ° C ≤ Tc < 30 ° C, and the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P0 of the micro-pressure-sensitive membrane when there is no condensation in the liquid inlet pipe, then the BMS control system issues an instruction to the water cooling unit to adjust the module water inlet temperature, that is, Tin ≤ 20 ° C. At this time, the real-time pressure P of the micro-pressure-sensitive membrane is equal to the pressure P0 of the micro-pressure-sensitive membrane when there is no condensation in the liquid inlet pipe. At the same time, the BMS control system issues an instruction for the battery assembly to switch from low-rate cycle charge and discharge to high-rate cycle charge and discharge; S5, when the BMS control system collects the real-time temperature of the battery assembly Tc≤-10℃, the BMS control system issues a command to stop the cycle charge and discharge of the battery assembly, and at the same time, the module inlet water temperature Tin≥25℃ to heat the battery assembly. When the real-time temperature of the battery assembly Tc>-10℃, the BMS issues a command to switch the battery assembly from low-rate cycle charge and discharge to high-rate cycle charge and discharge.

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