Liquid cooling device and high-capacity battery

Abstract

The utility model provides a liquid cooling device and a high-capacity battery, and mainly solves the problem that the existing high-capacity battery has potential safety hazards. The liquid cooling device comprises a liquid cooling plate and a plurality of heat conduction pieces, a liquid inlet and a liquid outlet which are communicated with the liquid cooling channel are formed in the liquid cooling plate; meanwhile, a plurality of through holes penetrating through the liquid cooling plate are formed in the liquid cooling plate, the plurality of heat conduction pieces are embedded into the through holes in a one-to-one correspondence manner, and each heat conduction piece is provided with a heat conduction hole through which the polarity terminal of the high-capacity battery penetrates. After the liquid cooling device is mounted at the top of the large-capacity battery, the bottom of the liquid cooling plate exchanges heat with a top plate of a shell of the large-capacity battery, and the heat conduction piece on the liquid cooling plate exchanges heat with a polar terminal of the large-capacity battery, so that the temperatures of different positions of the whole large-capacity battery are effectively controlled; and the performance problem and the safety problem caused by over-high or over-low temperature of the high-capacity battery are avoided.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to a liquid cooling device and a large-capacity battery. Background Art

[0002] At present, multiple single cells are connected in parallel or in series to form a large-capacity battery (which can also be called a battery module or a battery pack). However, there are differences among the single cells in the above large-capacity battery, resulting in great limitations on the capacity upper limit and cycle times of the entire large-capacity battery.

[0003] To solve the above problems, a large-capacity battery is provided at present. The large-capacity battery includes a housing and multiple single cells. The multiple single cells are arranged in the housing, and the differences among the single cells are reduced through a shared chamber in the housing, improving the consistency among the single cells to a certain extent, thereby improving the cycle life and performance of the large-capacity battery.

[0004] The large-capacity battery with the above structure has the characteristics of high space utilization rate, high integration degree, high energy density, etc. However, due to the high concentration of single cells in the large-capacity battery, a large amount of heat will be generated during the charging and discharging processes, and this heat will gradually increase. If the generated heat is not released in time, the heat will accumulate, causing uneven temperature of the large-capacity battery, thereby reducing the service life of the large-capacity battery. In severe cases, the thermal balance of the large-capacity battery is damaged, leading to potential safety hazards. Summary of the Invention

[0005] The utility model provides a liquid cooling device and a large-capacity battery, mainly solving the problem of potential safety hazards existing in the existing large-capacity battery.

[0006] To solve the above problems, the technical solution provided by the utility model is as follows:

[0007] A liquid cooling device includes at least one liquid cooling plate and multiple heat conducting members; a liquid cooling channel through which a heat transfer medium passes and a liquid inlet and a liquid outlet communicating with the liquid cooling channel are provided on the liquid cooling plate; at least one group of through holes arranged in sequence along the x direction and penetrating the liquid cooling plate in the z direction are provided on the liquid cooling plate, and the multiple heat conducting members are respectively embedded into the through holes one by one, and each heat conducting member is provided with a heat conducting hole through which a polarity terminal of the large-capacity battery passes, and the liquid cooling plate is insulated from the polarity terminal of the large-capacity battery.

[0008] Further, there are two liquid cooling plates, and one group of heat conducting members arranged in sequence along the x direction is provided on each liquid cooling plate, and the liquid inlet of one liquid cooling plate and the liquid outlet of the other liquid cooling plate are connected through a connecting pipe.

[0009] Further, there is one liquid cooling plate, and two groups of heat conducting members arranged in sequence along the x direction are provided on the liquid cooling plate.

[0010] Further, a partition is provided inside the liquid cooling plate to divide the liquid cooling channel into a U-shaped liquid cooling channel. The liquid inlet and the liquid outlet are provided on the same side wall of the liquid cooling plate, and the liquid cooling channel communicated with the liquid inlet exchanges heat with the positive terminal of the large-capacity battery, and the liquid cooling channel communicated with the liquid outlet exchanges heat with the positive terminal of the large-capacity battery.

[0011] Further, an avoidance groove for avoiding the gas sharing chamber of the large-capacity battery is provided at the bottom of the liquid cooling plate.

[0012] Further, circumferentially protruding annular flanges are respectively provided at the top and bottom ends of the heat conducting member. After the heat conducting member passes through the through hole of the liquid cooling plate, the annular flange at the top end of the heat conducting member is hermetically connected to the top plate of the liquid cooling plate, and the annular flange at the bottom end of the heat conducting member is hermetically connected to the bottom plate of the liquid cooling plate.

[0013] The present utility model further provides a large-capacity battery, which includes a housing, a plurality of single cells and the above-mentioned liquid cooling device; the plurality of single cells are arranged in the housing along the same x direction; a sharing chamber is provided in the housing, and the inner cavity of the sharing chamber is communicated with the inner cavities of all the single cells; avoidance holes are provided on the top plate of the housing corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the area of the top plate of the housing corresponding to the avoidance holes is fixedly sealed with the single cell housing; the liquid cooling plate is arranged on the top plate of the housing, and after the polarity terminals of each single cell extend out of the avoidance holes, they pass through the heat conducting holes of the heat conducting member.

[0014] Further, blocking edges extending along the x direction are respectively provided on both sides of the top plate of the housing, and the liquid cooling plate is embedded and installed inside the blocking edges.

[0015] Further, an insulating sealing glue layer is laid between the top plate of the housing and the liquid cooling plate, and the gap between each single cell polarity terminal and the avoidance hole is filled with an insulating sealing glue layer. An insulating protective cover is provided at the top of the housing, and each single cell polarity terminal and the liquid cooling plate are located inside the insulating protective cover.

[0016] Further, the sharing chamber includes an electrolyte sharing chamber and a gas sharing chamber; the electrolyte sharing chamber is communicated with the electrolyte areas of each single cell; the gas sharing chamber is communicated with the gas areas of each single cell, or the gas sharing chamber is a gas channel located between the top plate of the housing and each single cell, and this gas channel covers the explosion vent membranes of each single cell. When the explosion vent membrane of any single cell is broken by the hot runaway flue gas in the inner cavity, the gas area of this single cell is communicated with the gas channel.

[0017] Compared with the prior art, the advantages of the technical solution of the present utility model are:

[0018] 1. The liquid cooling device provided by the present utility model includes a liquid cooling plate and a plurality of heat conducting members. After installing the liquid cooling device on the top of a large-capacity battery, heat exchange occurs between the bottom of the liquid cooling plate and the top plate of the large-capacity battery housing, and heat exchange occurs between the heat conducting members of the liquid cooling plate and the polar terminals of the large-capacity battery. This heat exchange method effectively controls the temperature at different positions of the entire large-capacity battery, avoiding performance problems and safety problems caused by excessive or too low temperature of the large-capacity battery, and improving the performance and safety of the large-capacity battery. At the same time, the heat conducting members on the liquid cooling plate can also provide a certain flow-around effect when the heat transfer medium passes through the liquid cooling channel, enabling the heat transfer medium to fully exchange heat with the polar terminals and the top of the large-capacity battery, thereby improving the cooling effect of the liquid cooling plate.

[0019] 2. In the liquid cooling device of the present utility model, there are two liquid cooling plates, and each liquid cooling plate is provided with a group of heat conducting members arranged in sequence along the x direction. At the same time, the liquid inlet of one liquid cooling plate and the liquid outlet of the other liquid cooling plate are connected by a connecting pipe. This setting makes the liquid inlet and liquid outlet on the liquid cooling plate at the top of the large-capacity battery located on the same side of the liquid cooling plate, which is convenient for the assembly of the large-capacity battery, easy to connect with external pipelines, and improves the pipeline connectability and the compactness of pipeline layout.

[0020] 3. In the liquid cooling device of the present utility model, there is one liquid cooling plate, and this liquid cooling plate is provided with two groups of heat conducting members arranged in sequence along the x direction. Each heat conducting member is insulated from the polar terminals of the large-capacity battery. The liquid cooling plate with this structure can exchange heat with the positive and negative polar terminals of the large-capacity battery through only one liquid cooling plate. At the same time, the liquid cooling plate with this structure has a simple structure and is convenient to install.

[0021] 4. In the liquid cooling device of the present utility model, a partition is provided inside the liquid cooling plate to divide the liquid cooling channel into a U-shaped liquid cooling channel. At the same time, the liquid cooling channel communicated with the liquid inlet exchanges heat with the positive polar terminal of the large-capacity battery, and the liquid cooling channel communicated with the liquid outlet exchanges heat with the positive polar terminal of the large-capacity battery. When the large-capacity battery is working, the temperature of the positive polar terminal is higher than that of the negative polar terminal. This setting enables the heat transfer medium in the liquid cooling plate to first exchange heat with the relatively higher-temperature positive polar terminal and then exchange heat with the negative polar terminal, so that the temperatures of the positive and negative polar terminals are relatively more balanced, thereby improving the reliability when the large-capacity battery is working.

[0022] 5. In the liquid cooling device of the present utility model, an avoidance groove for avoiding the gas sharing chamber of the large-capacity battery is further provided at the bottom of the liquid cooling plate. This avoidance groove enables the liquid cooling plate to cover the gas sharing chamber of the large-capacity battery. When the large-capacity battery is working normally, the liquid cooling plate not only processes the heat at the top plate and polar terminals of the large-capacity battery, but also conducts heat exchange with the gas sharing chamber of the large-capacity battery, improving the heat exchange effect.

[0023] 6. In the large-capacity battery of the present utility model, the shared chamber includes an electrolyte shared chamber and a gas shared chamber. By connecting the electrolyte shared chamber with the electrolyte regions in the inner cavities of the individual cells within the outer casing, the electrolytes of the individual cells are shared, ensuring the consistency of the individual cells, thereby improving the cycle life of the large-capacity battery to a certain extent. By connecting the gas shared chamber with the gas regions in the inner cavities of the individual cells within the outer casing, the gas balance of the individual cells is achieved, improving the consistency among the individual cells to a certain extent, and thus improving the cycle life of the large-capacity battery to a certain extent.

[0024] 7. In the large-capacity battery of the present utility model, an insulating and sealing adhesive layer is laid between the top plate of the outer casing and the liquid cooling plate. When condensation occurs on the surface of the liquid cooling plate, the condensation cannot penetrate into the gap between the polar terminal and the relief hole under the blockage of the insulating and sealing adhesive layer, thereby preventing the occurrence of short circuit in the large-capacity battery. In addition, the large-capacity battery uses an insulating protective cover to provide insulation protection for the polar terminal and the liquid cooling plate, avoiding potential safety hazards that may exist when the polar terminal is exposed during the operation of the large-capacity battery, and also avoiding the problem of short circuit in the large-capacity battery caused by some foreign objects in the external environment falling into the position of the polar terminal, improving the safety of the large-capacity battery.

[0025] Other advantages, objectives, and features of the present utility model will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 is a schematic structural diagram of an existing large-capacity battery;

[0028] Figure 2 is an installation schematic diagram of the liquid cooling plate and the large-capacity battery in Embodiment 1;

[0029] Figure 3 is a schematic structural diagram of the liquid cooling plate in Embodiment 1;

[0030] Figure 4 is an exploded view of the liquid cooling plate in Embodiment 1;

[0031] Figure 5 is a cross-sectional profile diagram of the liquid cooling plate in Embodiment 1;

[0032] Figure 6 Schematic diagram of two liquid cooling plates in parallel in Embodiment 1;

[0033] Figure 7 Schematic diagram of two liquid cooling plates in series in Embodiment 1;

[0034] Figure 8 Schematic diagram of the structure of the liquid cooling plate (with an avoidance groove) in Embodiment 1;

[0035] Figure 9 Schematic diagram of the installation of the liquid cooling plate with an avoidance groove and a large-capacity battery in Embodiment 1;

[0036] Figure 10 Schematic diagram of the installation of the liquid cooling plate and a large-capacity battery in Embodiment 2;

[0037] Figure 11 Schematic diagram of the structure of the liquid cooling plate in Embodiment 2;

[0038] Figure 12 Explosion diagram of the liquid cooling plate in Embodiment 2;

[0039] Figure 13 Cross-sectional view of the liquid cooling plate (with a partition) in Embodiment 2;

[0040] Figure 14 Schematic diagram of the structure of the liquid cooling plate (with an avoidance groove) in Embodiment 2;

[0041] Figure 15 Schematic diagram of the structure of a large-capacity battery in Embodiment 3;

[0042] Figure 16 Explosion of a large-capacity battery and a liquid cooling device in Embodiment 3 Figure 1 ;

[0043] Figure 17 Explosion of a large-capacity battery and a liquid cooling device in Embodiment 3 Figure 2 ;

[0044] Figure 18 Schematic diagram of the structure of a large-capacity battery (with a rib on the outer shell) and a liquid cooling device in Embodiment 3;

[0045] Figure 19 Explosion diagram of a large-capacity battery (with a rib on the outer shell) and a liquid cooling device in Embodiment 3;

[0046] Figure 20 Schematic diagram of the structure of a large-capacity battery in Embodiment 4.

[0047] Reference numerals: 1 - large-capacity battery, 2 - liquid cooling device, 11 - housing, 12 - single cell, 13 - polarity terminal, 14 - explosion relief mechanism, 15 - insulating protective cover, 16 - first electrical connector, 17 - second electrical connector, 111 - electrolyte sharing chamber, 112 - gas sharing chamber, 113 - edge stop, 131 - positive polarity terminal, 132 - negative polarity terminal, 21 - liquid cooling plate, 22 - heat conducting member, 23 - avoidance groove, 24 - connecting pipe, 211 - liquid cooling channel, 212 - liquid inlet, 213 - liquid outlet, 214 - through hole, 215 - partition, 221 - heat conducting hole, 222 - annular flange. Detailed implementation manners

[0048] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the following provides a detailed description of the specific implementation manners of the present utility model with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0050] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "top, bottom" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, terms such as "first, second, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] Such as Figure 1As shown in the figure, to increase the capacity limit and cycle times of the large-capacity battery 1, the present utility model arranges a plurality of single cells 12 in the housing 11 in the same direction. An avoidance hole is provided on the top plate of the housing 11 to allow the polarity terminals 13 of each single cell 12 to protrude. At the same time, the housing 11 is provided with a shared chamber, and the inner cavities of each single cell 12 communicate with the shared chamber of the housing 11. The shared chamber may include a gas shared chamber 112 provided at the top of the housing 11 and an electrolyte shared chamber 111 provided at the bottom of the housing. Through this shared chamber, the differences between each single cell 12 are reduced, and the consistency between each single cell 12 is improved to a certain extent, thereby improving the cycle life of the large-capacity battery 1 to a certain extent. The above-mentioned housing 11 usually adopts a rectangular housing. For the convenience of description, the length direction of the housing 11 is defined as the x direction, the width direction of the housing 11 is defined as the y direction, and the height direction of the housing 11 is defined as the z direction.

[0052] To improve the reliability of the above large-capacity battery during operation, the present utility model provides a liquid cooling device. The liquid cooling device includes at least one liquid cooling plate and a plurality of heat conducting members provided on the liquid cooling plate. The liquid cooling device is mainly arranged on the top of the large-capacity battery and is sleeved on the polarity terminals of the large-capacity battery. The liquid cooling device can not only perform heat exchange with the top plate of the housing of the large-capacity battery, but also perform heat exchange with the polarity terminals of the large-capacity battery. During the normal use of the large-capacity battery 1, the liquid cooling device effectively exchanges heat with multiple regions of the large-capacity battery, so that the temperatures at different positions of the entire large-capacity battery are effectively controlled, avoiding performance problems and safety problems caused by too high or too low temperatures of the large-capacity battery, and improving the performance and reliability of the large-capacity battery.

[0053] Embodiment 1

[0054] As Figure 2 shown, this embodiment provides a liquid cooling device 2. The liquid cooling device 2 is installed on the top of the large-capacity battery 1 to control the temperature of the large-capacity battery 1 during normal operation, so that the large-capacity battery 1 operates within a suitable temperature range.

[0055] As Figure 3 、 Figure 4 and Figure 5As shown in the figure, the liquid cooling device 2 in this embodiment includes two liquid cooling plates 21 and a plurality of heat conducting members 22. The liquid cooling plates 21 are provided with liquid cooling channels 211 through which a heat transfer medium passes, and an inlet 212 and an outlet 213 that communicate with the liquid cooling channels 211. The heat transfer medium enters the liquid cooling channels 211 through the inlet 212, exchanges heat with the large-capacity battery 1, and then flows out through the outlet 213. When the temperature of the large-capacity battery 1 is higher than the set threshold, a heat transfer medium with a lower temperature is introduced into the liquid cooling channels 211 of the liquid cooling plates 21 to exchange heat with the large-capacity battery 1 and cool down the large-capacity battery 1. When the temperature of the large-capacity battery 1 is lower than the set threshold, a heat transfer medium with a higher temperature is introduced into the liquid cooling plates 21 to heat up the large-capacity battery 1. By controlling the temperature of the heat transfer medium, it can be ensured that the large-capacity battery 1 always operates at the normal working temperature.

[0056] The liquid cooling plate 21 in this embodiment is a rectangular plate, and the length of the rectangular plate is the same as the length of the outer shell 11 of the large-capacity battery 1. The rectangular plate is provided with through holes 214 that are arranged in sequence along the x direction and penetrate the liquid cooling plate 21 in the z direction. Here, the through holes 214 refer to the through holes 214 that penetrate the top plate and the bottom plate of the liquid cooling plate 21.

[0057] In this embodiment, as Figure 4 shown, the through holes 214 on the liquid cooling plate 21 are a group, and this group of through holes 214 are arranged in sequence along the x direction. The number of through holes 214 is the same as the number of single cells 12 in the large-capacity battery 1. Heat conducting members 22 with the same number as the single cells 12 are respectively embedded into the above through holes 214, and the heat conducting members 22 seal the through holes 214 so that the heat transfer medium in the liquid cooling channels cannot flow out through the through holes 214. At the same time, the distance between adjacent heat conducting members 22 is the same as the distance between adjacent polarity terminals 13 in the large-capacity battery 1.

[0058] The heat conducting member 22 in this embodiment is a columnar structure, and the cross-sectional shape of the heat conducting member 22 is the same as the shape of the through holes 214. At the same time, the length of the heat conducting member 22 is greater than or equal to the thickness of the liquid cooling plate 21. If the length of the heat conducting member 22 (i.e., the length of the heat conducting member 22 in the z direction) is greater than the thickness of the liquid cooling plate 21, at this time, the bottom end of the heat conducting member 22 needs to be on the same plane as the bottom plate of the liquid cooling plate 21 so that the bottom plate of the liquid cooling plate 21 can contact the top plate of the outer shell 11 of the large-capacity battery 1 for heat exchange. If the bottom end of the heat conducting member 22 protrudes from the bottom plate of the liquid cooling plate 21, there will be a gap between the bottom plate of the liquid cooling plate 21 and the top plate of the outer shell 11 of the large-capacity battery 1, thereby affecting the heat exchange effect between the liquid cooling plate 21 and the top plate of the outer shell 11 of the large-capacity battery 1. Preferably, the length of the heat conducting member 22 is the same as the thickness of the liquid cooling plate 21. At this time, the top end of the heat conducting member 22 is on the same plane as the top plate of the liquid cooling plate 21, and the bottom end of the heat conducting member 22 is on the same plane as the bottom plate of the liquid cooling plate 21, which is convenient for the installation of the liquid cooling plate 21.

[0059] As shown Figure 4 in the figure above, each of the above heat conducting members 22 is provided with a heat conducting hole 221 through which the polar terminal 13 of the large-capacity battery 1 passes. The size of the heat conducting hole 221 is equal to or slightly larger than the size of the polar terminal 13 of the large-capacity battery 1, so that the polar terminal 13 can pass through the heat conducting hole 221. After the heat conducting hole 221 is formed in the heat conducting member 22, the heat conducting member 22 is specifically a hollow thin-wall structure. The thinner the wall thickness of the thin-wall structure, the better the heat exchange effect with the polar terminal 13 of the large-capacity battery 1.

[0060] In addition, the thickness of the above liquid cooling plate 21 and the length of the heat conducting member 22 need to be less than the height of the polar terminal of the large-capacity battery. After the liquid cooling plate 21 is sleeved on the polar terminal of the large-capacity battery, the top end of the polar terminal of the large-capacity battery can extend out of the heat conducting member 22, so that the polar terminal of the large-capacity battery can achieve electrical connection.

[0061] During processing and manufacturing, the above heat conducting member 22 and the liquid cooling plate 21 can be integrally formed parts. At this time, the heat conducting member 22 is made of the same material as the liquid cooling plate 21; the above heat conducting member 22 can also be made separately from the liquid cooling plate 21. Subsequently, the heat conducting member 22 is embedded into the through hole 214 of the liquid cooling plate 21. After the heat conducting member 22 is embedded into the through hole 214 of the liquid cooling plate 21, the top end of the heat conducting member 22 can be hermetically connected to the area around the top plate through hole 214 of the liquid cooling plate 21, and the bottom end of the heat conducting member 22 can be hermetically connected to the area around the bottom plate through hole 214 of the liquid cooling plate 21.

[0062] As shown Figure 5 in the figure, in this embodiment, to ensure the reliability and tightness of the connection between the heat conducting member 22 and the liquid cooling plate 21, circumferentially protruding annular flanges 222 can be respectively provided at the top end and the bottom end of the above heat conducting member 22. After the heat conducting member 22 passes through the through hole 214 of the liquid cooling plate 21, the annular flange 222 at the top of the heat conducting member 22 is hermetically connected to the top plate of the liquid cooling plate 21, and the annular flange 222 at the bottom of the heat conducting member 22 is fixedly connected to the bottom plate of the liquid cooling plate 21, and the hermetic connection can be achieved by welding. Further, counterbores can be machined at the positions of the through holes 214 on the top plate and the bottom plate of the liquid cooling plate 21. At this time, the annular flange 222 on the heat conducting member 22 cooperates with the counterbores on the liquid cooling plate 21 to achieve fixed connection.

[0063] In this embodiment, a group of heat conducting members 22 arranged in sequence along the x direction are provided on the liquid cooling plate 21. The liquid cooling plate 21 is sleeved on the polar terminal 13 on one side of the large-capacity battery 1. When controlling the temperature of the large-capacity battery 1, two liquid cooling plates 21 are provided on each large-capacity battery 1. The liquid cooling plate 21 can specifically control the temperature of the large-capacity battery in the following manner:

[0064] Parallel connection: As shownFigure 6 As shown, the two liquid cooling plates 21 each have a liquid inlet 212 and a liquid outlet 213. The liquid inlets 212 and the liquid outlets 213 of the two liquid cooling plates 21 are respectively connected to external pipelines. At this time, the two liquid cooling plates 21 on the large-capacity battery 1 are connected in parallel.

[0065] Series connection: As Figure 7 As shown, two independent liquid cooling plates 21 are provided on each large-capacity battery 1. The liquid inlets 212 and the liquid outlets 213 of the two liquid cooling plates 21 are connected by a connecting pipe 24. After connection, the liquid inlet 212 of one of the liquid cooling plates 21 is connected to an external pipeline, and the liquid outlet 213 of the other liquid cooling plate 21 is connected to an external pipeline. At this time, the two liquid cooling plates 21 on the large-capacity battery 1 are connected in series.

[0066] When the large-capacity battery 1 is working, the temperature of the positive terminal 131 is higher than that of the negative terminal 132. When the two liquid cooling plates 21 are connected in series, there is a liquid inlet 212 and a liquid outlet 213 connected to an external pipeline. At this time, the liquid cooling channel 211 communicated with the liquid inlet 212 exchanges heat with the positive terminal 131 of the large-capacity battery 1, and the liquid cooling channel 211 communicated with the liquid outlet 213 exchanges heat with the positive terminal 131 of the large-capacity battery 1. When the two liquid cooling plates 21 exchange heat with the large-capacity battery 1, the heat transfer medium first exchanges heat with the higher-temperature positive terminal 131, and then exchanges heat with the negative terminal 132, so that the temperatures of the positive terminal 131 and the negative terminal 132 are relatively balanced, thereby improving the reliability when the large-capacity battery 1 is working.

[0067] When the two liquid cooling plates 21 are installed on the top of the large-capacity battery 1, they exchange heat with both the positive terminal 131 and the negative terminal 132 of the large-capacity battery 1. To ensure the safety when the large-capacity battery 1 is working, the liquid cooling plate 21 is insulated from the polarity terminal 13 of the large-capacity battery 1. The insulation can be specifically achieved in the following ways:

[0068] First, perform insulation treatment on the positive terminal 131 and the negative terminal 132 of the large-capacity battery;

[0069] Perform insulation treatment on the polarity terminals 13 of each single battery 12. Specifically, an insulating layer is provided on the part where the polarity terminals 13 of each single battery 12 are in contact with the heat-conducting member 22. The insulating layer can be a ceramic coating such as boron nitride, alumina, or copper fluoride coating, or an insulating paint layer formed by coating, or a hard anodized layer formed after oxidation treatment, or an enamel insulating layer, etc.; When specifically set, the insulating layer is formed on the side wall of the polarity terminal 13;

[0070] Second, an insulating sleeve is added between the heat conducting member 22 and the positive terminal 131 and the negative terminal 132 of the large-capacity battery;

[0071] An insulating sleeve is provided between the polar terminals 13 of the large-capacity battery and the heat conducting member 22. For example, the insulating sleeve is an insulating plastic sleeve, an insulating rubber sleeve, a heat-conducting ceramic sleeve, etc.;

[0072] Third, the heat conducting member 22 is insulated;

[0073] If the heat conducting member 22 and the liquid cooling plate 21 are processed separately and then assembled, the heat conducting member 22 can be made of an insulating material. For example, it is made of insulating rubber; if the heat conducting member 22 and the liquid cooling plate 21 are integrally formed, an insulating layer can be provided on the inner wall of the heat conducting member 22 to ensure the insulation between the liquid cooling plate 21 and the large-capacity battery 1 during use. The insulating layer can specifically be a ceramic coating (boron nitride or alumina, copper fluoride coating), insulating paint, enamel insulating layer or hard anodized layer, etc.

[0074] Preferably, while insulating the heat conducting member 22, an insulating sleeve can also be added between the heat conducting member 22 and the positive terminal 131 and the negative terminal 132. This double-insulation setting improves the safety of the large-capacity battery during use and avoids safety problems caused by the damage of one of the insulations.

[0075] Fourth, the liquid cooling plate 21 is insulated;

[0076] The liquid cooling plate 21 is made of an insulating material, or the inner and outer surfaces of the entire liquid cooling plate are coated with an insulating layer. At the same time, the heat transfer medium in the liquid cooling plate 21 is an insulating liquid.

[0077] In addition, as Figure 8 and Figure 9 shown, when the above-mentioned liquid cooling plate 21 is arranged on the large-capacity battery 1, an avoidance groove 23 for avoiding the gas sharing chamber 112 of the large-capacity battery 1 is further provided at the bottom of the liquid cooling plate 21. The avoidance groove 23 is a notch groove provided on one side of the bottom of the liquid cooling plate 21. When two liquid cooling plates 21 having the avoidance groove 23 are installed on the top of the large-capacity battery 1, the avoidance grooves of the two liquid cooling plates are adjacent and close to form a groove. At this time, the gas sharing chamber 112 of the large-capacity battery 1 is embedded in the groove. The avoidance groove 23 enables the bottoms of the two liquid cooling plates 21 to cover the gas sharing chamber 112 of the large-capacity battery 1. When the large-capacity battery 1 is working normally, the liquid cooling plate 21 not only processes the heat at the top plate and the polar terminals 13 of the large-capacity battery 1, but also performs heat exchange on the gas sharing chamber 112 of the large-capacity battery 1, improving the heat exchange effect.

[0078] Embodiment 2

[0079] As Figure 10As shown, the liquid cooling device 2 in this embodiment is similar to the liquid cooling device 2 in Embodiment 1. The difference is that in this embodiment, two groups of heat conducting members 22 are arranged in sequence along the x direction on the liquid cooling plate 21 of the liquid cooling device 2, so that through this one liquid cooling plate 21, heat exchange can be achieved not only with the top of the large-capacity battery 1, but also with both the positive terminal 131 and the negative terminal 132 of the large-capacity battery 1.

[0080] As Figure 11 and Figure 12 As shown, in this embodiment, the length dimension of the liquid cooling plate 21 is the same as the length dimension of the top plate of the large-capacity battery 1, and the width dimension is the same as the width dimension of the top plate of the large-capacity battery 1. Two groups of through holes 214 are arranged in sequence along the x direction on the liquid cooling plate 21. The number of through holes 214 is twice the number of single cells. The distance between the two groups of through holes 214 is the same as the distance between the positive terminal 131 and the negative terminal 132 of the large-capacity battery 1. Correspondingly, two groups of heat conducting members 22 are respectively arranged in the two groups of through holes 214. One group of heat conducting members 22 exchanges heat with the positive terminal 131 of the large-capacity battery 1, and the other group of heat conducting members 22 exchanges heat with the negative terminal 132 of the large-capacity battery 1. Among them, the structure of the heat conducting member 22 and its cooperation with the liquid cooling plate 21 are similar to those in Embodiment 1.

[0081] To improve the heat exchange effect of the heat transfer medium, as Figure 13 shown, in this embodiment, a partition 215 is further provided in the liquid cooling plate 21 to divide the liquid cooling channel 211 into a U-shaped liquid cooling channel. At this time, the liquid inlet 212 and the liquid outlet 213 of the liquid cooling plate 21 are located on the same side wall of the liquid cooling plate 21. Setting the liquid inlet 212 and the liquid outlet 213 on the same side wall of the liquid cooling plate 21 is convenient for the large-capacity battery 1 to be easily connected to the external pipeline when assembled into an energy storage device, improving the pipeline connectability and the compactness of the pipeline layout.

[0082] In addition, when the large-capacity battery 1 is working, the temperature of the positive terminal 131 is higher than that of the negative terminal 132. At this time, the liquid cooling channel 211 communicated with the liquid inlet 212 exchanges heat with the positive terminal 131 of the large-capacity battery 1, and the liquid cooling channel 211 communicated with the liquid outlet 213 exchanges heat with the positive terminal 131 of the large-capacity battery 1. When the liquid cooling plate 21 exchanges heat with the large-capacity battery 1, the heat transfer medium in the liquid cooling plate 21 first exchanges heat with the relatively high-temperature positive terminal 131, and then exchanges heat with the negative terminal 132, so that the temperatures of the positive terminal 131 and the negative terminal 132 are relatively balanced, thereby improving the reliability of the large-capacity battery 1 during operation.

[0083] As Figure 14As shown, if in the large-capacity battery 1, the gas sharing chamber 112 protrudes from the top of the outer shell 11, at this time, an avoidance groove 23 for avoiding the gas sharing chamber 112 of the large-capacity battery 1 can also be provided at the bottom of the liquid cooling plate 21. The avoidance groove 23 is a strip-shaped groove and extends along the x direction at the bottom of the liquid cooling plate. After installation, the liquid cooling plate 21 covers the gas sharing chamber 112 of the large-capacity battery 1. When the large-capacity battery 1 is working normally, the liquid cooling plate 21 not only processes the heat at the top plate and the polar terminals 13 of the large-capacity battery 1, but also performs heat exchange on the gas sharing chamber 112 of the large-capacity battery 1.

[0084] After the liquid cooling plate 21 is installed on the top of the large-capacity battery 1, it exchanges heat with the positive polar terminal 131 of the large-capacity battery 1 and also exchanges heat with the negative polar terminal 132 of the large-capacity battery 1. In order to ensure the safety of the large-capacity battery 1 during operation, insulation needs to be carried out between the liquid cooling plate 21 and the polar terminals 13 of the large-capacity battery 1. The specific insulation method is the same as that in Embodiment 1, and will not be described in detail in this embodiment.

[0085] It should be noted that when the liquid cooling plate 21 is arranged on the top of the outer shell 11 of the large-capacity battery 1 and contacts the outer shell 11, when the outer shell 11 of the large-capacity battery 1 is charged, insulation also needs to be ensured between the liquid cooling plate 21 and the large-capacity battery 1. Usually, insulation treatment can be performed on the outer shell 11 or the liquid cooling plate 21 of the large-capacity battery 1, such as spraying insulating paint or covering a layer of insulating material on the surface of the outer shell 11 or the liquid cooling plate 21 of the large-capacity battery 1, or adding an insulating pad between the two to achieve the purpose.

[0086] Embodiment 3

[0087] As Figure 15 shown, this embodiment provides a large-capacity battery. The large-capacity battery 1 includes an outer shell 11 and N single cells 12, where N is an integer greater than 1. The single cells 12 in this embodiment are square shell batteries, and the quantity can be adjusted according to actual needs. The inner cavity of each single cell 12 includes an electrolyte area and a gas area.

[0088] As Figure 1 and Figure 15As shown, in this embodiment, after N single cells 12 are arranged in the same x direction and placed in the housing 11, avoidance holes are provided on the top plate of the housing 11 corresponding to the polar terminals 13 of each single cell 12. The polar terminals 13 of each single cell 12 extend out of the corresponding avoidance holes to serve as the polar terminals 13 of the large-capacity battery 1 (the polar terminals 13 of all single cells 12 on one side serve as the positive polar terminals 131 of the large-capacity battery, and the polar terminals 13 of all single cells 12 on the other side serve as the negative polar terminals 132 of the large-capacity battery). The area of the top plate of the housing 11 corresponding to the avoidance hole is fixedly sealed with the housing of the single cell 12, so that the gap between the polar terminal 13 and the avoidance hole is sealed. Usually, a sealing connector can be used to fixedly seal the area of the top plate of the housing 11 and the housing of the single cell 12. The sealing connector can include a hollow member (similar to a hollow tube), and the hollow member is sleeved outside the polar terminal 13 of the single cell 12; the bottom of the hollow member is hermetically connected to the area around the polar terminal 13 of the upper cover plate of the single cell 12, and the top of the hollow member is hermetically connected to the area of the top plate of the housing 11 corresponding to the avoidance hole. Among them, welding can be used to achieve the sealing connection.

[0089] It should be noted that the polar terminal of the single cell 12 here can be the pole column of the single cell 12. If it is to avoid that the pole column of the single cell 12 cannot smoothly extend out of the avoidance hole as the polar terminal, a pole column adapter can also be connected to the pole column of the single cell 12, and the overall structure of the cooperation between the pole column of the single cell 12 and the pole column adapter is used as the polar terminal of the single cell 12.

[0090] The above-mentioned housing 11 is provided with a shared chamber, and the inner cavity of the shared chamber is communicated with the inner cavities of all single cells 12. By placing multiple single cells 12 in a housing 11 with a shared chamber, and using the fact that the shared chamber and the inner cavities of each single cell 12 in the housing 11 are connected, the differences between the single cells 12 are reduced, and the consistency between the single cells 12 is improved to a certain extent, thereby improving the cycle life of the large-capacity battery 1 to a certain extent. The shared chamber specifically includes the following types:

[0091] The shared chamber in the above-mentioned housing 11 can be an electrolyte shared chamber 111. The inner cavity of the electrolyte shared chamber 111 is communicated with the electrolyte areas in the inner cavities of all single cells 12. Through the electrolyte shared chamber 111, each single cell 12 can be in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell 12 and improving the performance and charge-discharge cycle life of the large-capacity battery 1. It should be noted here that the above-mentioned electrolyte shared chamber 111 is an electrolyte containing chamber. After it is communicated with the electrolyte areas in the inner cavities of each single cell 12, it is necessary to ensure that the electrolyte in the entire large-capacity battery 1 does not come into contact with the external environment.

[0092] The shared chamber inside the above-mentioned housing 11 may be a gas shared chamber 112. The inner cavity of the gas shared chamber 112 is in communication with the gas regions of the inner cavities of all the single cells 12. The gas balance of each single cell 12 is achieved through the gas shared chamber 112, and the performance and charge-discharge cycle life of the large-capacity battery 1 are also improved. In this structure, the upper cover plate of the single cell 12 is provided with a gas port that penetrates through the inner cavity of the single cell 12. At this time, the inner cavity of the gas shared chamber 112 is in communication with the gas regions of the inner cavities of each single cell 12 through this gas port. Based on the gas shared chamber 112, the gas regions of each single cell 12 can be connected to achieve gas balance.

[0093] The above-mentioned shared chamber may be a gas-liquid shared chamber. The inner cavity of the gas-liquid shared chamber is in communication with both the electrolyte region and the gas region of the inner cavities of all the single cells 12. Through a single gas-liquid shared chamber, each single cell 12 can be in a unified electrolyte environment and gas environment, improving the performance and charge-discharge cycle life of the large-capacity battery 1. Specifically, when setting, a protrusion extending along the arrangement direction of the single cells 12 is provided on the side plate of the housing 11, and a gas-liquid shared chamber is formed at the protrusion part. The gas-liquid shared chamber is in communication with both the electrolyte region and the gas region of each single cell 12.

[0094] The above-mentioned shared chamber may also include an electrolyte shared chamber 111 and a gas shared chamber 112 at the same time. The inner cavity of the electrolyte shared chamber 111 is in communication with the electrolyte regions of the inner cavities of all the single cells 12, and the inner cavity of the gas shared chamber 112 is in communication with the gas regions of the inner cavities of all the single cells 12. The above-mentioned large-capacity battery 1 places a plurality of single cells 12 inside a housing 11 having a shared chamber, and uses the shared chamber to penetrate through the inner cavities of each single cell 12 located inside the housing 11, so that the electrolytes and gases of each single cell 12 are shared to ensure the consistency of each single cell 12, that is, the electrolytes and gases of each single cell 12 are connected, so that the electrolytes and gases of all the single cells 12 are in the same system, reducing the differences between each single cell 12, and improving the consistency between each single cell 12 to a certain extent, thereby improving the cycle life of the large-capacity battery 1 to a certain extent.

[0095] The above-mentioned shared chamber may also include an electrolyte shared chamber 111 and a gas shared chamber 112 at the same time. The inner cavity of the electrolyte shared chamber 111 is communicated with the electrolyte regions in the inner cavities of all the single cells 12. The gas shared chamber 112 is a gas passage located between the top plate of the outer shell 11 and each single cell 12, and this gas passage covers the explosion vent membranes on the tops of the single cells 12. When the explosion vent membrane of any single cell 12 is broken through by the hot runaway flue gas in the inner cavity, the gas region in the inner cavity of this single cell 12 is communicated with the inner cavity of the gas chamber. This gas shared chamber 112 is used as an explosion vent passage. That is, during the normal operation of the large-capacity battery 1, the inner cavities of the single cells 12 are not communicated with the explosion vent passage. When any single cell 12 has a thermal runaway, when the explosion vent membrane on the top of this single cell 12 is opened by the flue gas in the inner cavity, the inner cavity of this single cell 12 is communicated with the explosion vent passage, and the hot runaway flue gas is discharged through the explosion vent passage, improving the safety of the large-capacity battery 1.

[0096] The outer shell 11 provided with the gas shared chamber 112 and the electrolyte shared chamber 111 may be specifically implemented by the following structures:

[0097] 1) The outer shell 11 includes a cylinder body, an upper cover plate, and a lower cover plate; both the top and bottom of the cylinder body are open. The upper cover plate is hermetically fixed (welded) to the top of the cylinder body. Avoidance holes are provided on the upper cover plate to allow the pole columns of the single cells 12 to extend out. The lower cover plate is hermetically fixed (welded) to the bottom of the cylinder body. At the same time, a protrusion extending along the arrangement direction of the single cells 12 is provided on the upper cover plate, and a gas shared chamber 112 is formed at the protrusion part. A protrusion extending along the arrangement direction of the single cells 12 is provided on the lower cover plate, and an electrolyte shared chamber 111 is formed at the protrusion part.

[0098] 2) The outer shell 11 includes a U-shaped shell, a first cover plate, a third cover plate, and a second cover plate; the first cover plate and the third cover plate respectively cover two opposite open ends of the U-shaped shell; the second cover plate covers the open end at the top of the U-shaped shell and is hermetically connected to this open end, and avoidance holes are provided on the second cover plate to allow the pole columns of the single cells 12 to extend out. At the same time, a protrusion extending along the arrangement direction of the single cells 12 is provided on the second cover plate, and a gas shared chamber 112 is formed at the protrusion part. An electrolyte shared chamber 111 is provided at the bottom of the U-shaped shell. The electrolyte shared chamber 111 is a liquid passage provided between the bottom plate of the outer shell 11 and each single cell 12.

[0099] 3) The housing 11 includes a cylinder, a first end plate, and a second end plate; both the front and rear parts of the cylinder are open, the first end plate is hermetically fixed (welded) to the front of the cylinder, and the second end plate is hermetically fixed (welded) to the rear of the cylinder. An avoidance hole is provided at the top of the cylinder to allow the electrode posts of each single battery 12 to protrude. A protrusion extending along the arrangement direction of the single batteries 12 is provided at the top of the cylinder, and a gas sharing chamber 112 is formed at the protrusion part. An electrolyte sharing chamber 111 is provided at the bottom of the cylinder, and the electrolyte sharing chamber 111 is a liquid channel provided between the bottom plate or the support plate of the cylinder and the bottoms of the single batteries 12.

[0100] As Figure 15 shown, in order to further improve the safety of the large-capacity battery 1 during use, a pressure relief mechanism 14 communicating with the inner cavity of the housing 11 is provided on the housing 11 of the large-capacity battery 1. The pressure relief mechanism 14 specifically includes a pressure relief pipe and a pressure relief part. One end of the pressure relief pipe is connected to the pressure relief port of the large-capacity battery 1, and the other end is connected to the flue gas pipeline. The pressure relief part is provided on the pressure relief pipe or at the pressure relief port of the large-capacity battery 1. Among them, the pressure relief part can specifically be a pressure relief membrane or a pressure relief valve. The pressure relief mechanism 14 can ensure that when the large-capacity battery 1 undergoes thermal runaway, the thermal runaway flue gas inside it can be smoothly discharged, avoiding potential safety hazards such as explosion inside the housing 11 of the large-capacity battery 1. Specifically during connection, at least one of the electrolyte sharing chamber 111 and the gas sharing chamber 112 is connected to the pressure relief mechanism 14. When both the electrolyte sharing chamber 111 and the gas sharing chamber 112 are connected to the pressure relief mechanism 14, two groups of pressure relief mechanisms 14 are provided on the housing 11 of the large-capacity battery 1, and the two groups of pressure relief mechanisms 14 are respectively connected to the electrolyte sharing chamber 111 and the gas sharing chamber 112. This setting enables the large-capacity battery 1 to have two pressure relief channels. When any single battery 12 undergoes thermal runaway, the thermal runaway flue gas is discharged from different pressure relief channels, and the heat and thermal runaway flue gas accumulated in the pressure relief channels and the single battery 12 can be reduced in a short time, reducing the explosion risk.

[0101] As Figure 16 、 Figure 17 and Figure 20 shown, based on the above structure, the large-capacity battery in this embodiment further includes the liquid cooling device of Embodiment 1 or Embodiment 2. The liquid cooling plate of the liquid cooling device is arranged on the top plate of the housing. After the polarity terminals of each single battery extend out of the avoidance hole, they pass through the heat conduction holes of the heat conduction member. After the end faces of the polarity terminals 13 of each single battery 12 extend out of the liquid cooling plate 21, they are used to connect to the first electrical connector 16 or the second electrical connector 17. Among them, the electrical connector is a connecting device for realizing the parallel connection of each single battery 12, and the second electrical connector 17 is a connecting device for realizing the series connection of two large-capacity batteries 1, and can also be a connecting device for connecting the large-capacity battery 1 to an external load.

[0102] After the liquid cooling device is installed on top of the large-capacity battery, the bottom of the liquid cooling plate contacts the top plate of the large-capacity battery casing for heat exchange, and the heat conductor of the liquid cooling plate exchanges heat with the polarity terminals of the large-capacity battery. This heat exchange method effectively controls the temperature at different positions of the entire large-capacity battery, avoiding performance and safety problems caused by excessively high or low temperatures of the large-capacity battery, and improving the performance and safety of the large-capacity battery.

[0103] like Figure 18 and Figure 19 As shown, in this embodiment, ribs 113 extending along the x-direction are provided on both sides of the top plate of the housing 11. The liquid cooling plate 21 is embedded in the inner side of the ribs 113. After the liquid cooling plate 21 is installed, the ribs 113 can position and limit the liquid cooling plate 21, while also protecting the liquid cooling plate 21. When the liquid cooling plate 21 is subjected to external impact or force, the liquid cooling plate 21 may squeeze the polarity terminals of the large-capacity battery in the x-direction or y-direction, thereby affecting the sealing between the housing and the housings of each single battery cell, and possibly affecting the performance of the large-capacity battery. The ribs 113 extending along the x-direction on both sides of the top plate of the housing 11 protect the liquid cooling plate 21 and thus avoid this problem.

[0104] After the liquid cooling plate 21 is installed on the top of the shell 11, since the liquid cooling plate 21 is mounted on the polarity terminals of the large-capacity battery, it has been positioned and installed accordingly in the x and y directions. It can be fixed in the z direction by the following methods: first, multiple mounting plates are welded on the liquid cooling plate 21, and the mounting plates are fixed to the shell by bolts; second, multiple U-shaped connecting plates are provided on the top of the liquid cooling plate 21. When connected, the U-shaped connecting plates are inverted and buckled on the liquid cooling plate 21, and the two side plates of the U-shaped connecting plates are fixed to the side walls of the shell by bolts or welding; third, threaded holes are machined on the side walls of the shell 11, and threaded holes are also machined on the liquid cooling plate 21, and the liquid cooling plate 21 is fixed to the shell 11 by screws. This method requires that the wall thickness of the shell 11 and the wall thickness of the liquid cooling plate 21 meet the requirements.

[0105] Example 4

[0106] During long-term use of the large-capacity battery 1, condensation will form on the surface due to the temperature difference between the inside and outside of the liquid cooling plate 21. When the condensation accumulates to a certain amount, it will penetrate into the gap between the polarity terminal 13 of the single battery 12 and the avoidance hole, causing the polarity terminal 13 of the single battery 12 to be electrically conductive with the shell 11, which may cause the same single battery 12 to short-circuit.

[0107] This embodiment optimizes the structure of the large-capacity battery 1 in embodiment 3. Figure 20As shown, an insulating and sealing adhesive layer is laid between the top plate of the outer shell 11 and the liquid cooling plate 21, and the gaps between the polar terminals 13 of each single battery 12 and the avoidance holes are filled with the insulating and sealing adhesive layer to overcome the above problems. The thickness of the insulating and sealing adhesive layer is small, and it only needs to ensure that condensation cannot enter the gaps between the polar terminals 13 of the single battery 12 and the avoidance holes. The insulating and sealing adhesive layer with a thinner thickness can ensure the heat exchange between the liquid cooling plate 21 and the outer shell 11. The above insulating and sealing adhesive is generally the commonly used battery potting adhesive for batteries. For example, silicone thermal conductive potting adhesive can be used, as long as it has good functions such as sealing, insulation, vibration resistance, heat dissipation, and waterproofing.

[0108] In other embodiments, the insulating and sealing adhesive layer can also be set to be thicker. At this time, the entire liquid cooling plate 21 is covered by the insulating and sealing adhesive layer, that is, the liquid cooling plate 21 is submerged in the insulating and sealing adhesive layer. The insulating and sealing adhesive layer is filled between the top plate of the outer shell 11 and the bottom of the liquid cooling plate 21, on the top of the liquid cooling plate 21, and between the heat conducting member and the polar terminal of the large-capacity battery. It should be noted that after laying the insulating and sealing adhesive layer, the end of the polar terminal of the large-capacity battery needs to extend out of the insulating and sealing adhesive layer to achieve connection with the electrical connection member. The liquid inlet and outlet of the liquid cooling plate also need to extend out of the insulating and sealing adhesive layer. This laying method of the insulating and sealing adhesive layer enables the liquid cooling plate 21 to be fixed on the top of the outer shell 11 without using other methods to fix the liquid cooling plate 21.

[0109] Such as Figure 20 As shown, on the basis of the above structure, an insulating protective cover 15 is further provided on the top of the large-capacity battery 1 in this embodiment, so as to provide insulating protection for the polar terminal 13 and the liquid cooling plate 21, avoiding potential safety hazards that may exist when the polar terminal 13 is exposed during the operation of the large-capacity battery 1, and also avoiding the problem that some foreign objects in the external environment fall into the position of the polar terminal 13 and cause the large-capacity battery 1 to short-circuit, improving the safety of the large-capacity battery 1.

[0110] In addition, an insulating protective cover 15 is installed on the top of the liquid cooling plate 21. The insulating protective cover 15 also positions and installs the liquid cooling plate 21 in the z direction, enabling the liquid cooling plate 21 to be reliably installed on the outer shell of the large-capacity battery and realizing integrated installation.

[0111] It should be noted that if the insulating protective cover 15 completely wraps the polar terminal 13, it will make the electrical connection of such large-capacity batteries 1 more difficult. Therefore, in this embodiment, a slit is opened on the side wall of the insulating protective cover 15, through which the electrical connection member can be connected to the polar terminal 13 of the large-capacity battery 1, thereby realizing electrical connection. It should also be noted that channels for the liquid inlet and outlet of the liquid cooling plate 21 to extend out need to be opened on the side wall of the insulating protective cover 15.

Claims

1. A liquid cooling device, characterized in that, Comprising at least one liquid cooling plate and a plurality of heat conducting members; The liquid cooling plate is provided with a liquid cooling channel through which a heat transfer medium passes, and a liquid inlet and a liquid outlet communicated with the liquid cooling channel; The liquid cooling plate is provided with at least one group of through holes arranged in sequence along the x direction and penetrating the liquid cooling plate in the z direction. A plurality of heat conducting members are respectively and correspondingly embedded into the through holes, and each heat conducting member is provided with a heat conducting hole through which a large-capacity battery polarity terminal passes. The liquid cooling plate is insulated from the polarity terminal of the large-capacity battery.

2. The liquid cooling device according to claim 1, characterized in that There are two liquid cooling plates, and each liquid cooling plate is provided with a group of heat conducting members arranged in sequence along the x direction. The liquid inlet of one liquid cooling plate and the liquid outlet of the other liquid cooling plate are connected by a connecting pipe.

3. The liquid cooling device according to claim 1, characterized in that There is one liquid cooling plate, and the liquid cooling plate is provided with two groups of heat conducting members arranged in sequence along the x direction.

4. The liquid cooling device according to claim 3, characterized in that, A partition is arranged in the liquid cooling plate to divide the liquid cooling channel into a U-shaped liquid cooling channel. The liquid inlet and the liquid outlet are arranged on the same side wall of the liquid cooling plate, and the liquid cooling channel communicated with the liquid inlet exchanges heat with the positive polarity terminal of the large-capacity battery, and the liquid cooling channel communicated with the liquid outlet exchanges heat with the positive polarity terminal of the large-capacity battery.

5. The liquid cooling device according to any one of claims 1 to 4, characterized in that An avoidance groove for avoiding the gas sharing chamber of the large-capacity battery is arranged at the bottom of the liquid cooling plate.

6. The liquid cooling device according to claim 5, characterized in that Circular flanges protruding circumferentially are respectively arranged at the top end and the bottom end of the heat conducting member. After the heat conducting member passes through the through hole of the liquid cooling plate, the circular flange at the top end of the heat conducting member is hermetically connected to the top plate of the liquid cooling plate, and the circular flange at the bottom end of the heat conducting member is hermetically connected to the bottom plate of the liquid cooling plate.

7. A large-capacity battery, characterized in that, Comprising a housing, a plurality of single cells, and the liquid cooling device according to any one of claims 1 to 6; the plurality of single cells are arranged in the housing along the same x direction; a sharing chamber is arranged in the housing, and the inner cavity of the sharing chamber is communicated with the inner cavities of all the single cells; avoidance holes are formed in the top plate of the housing corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the area of the top plate of the housing corresponding to the avoidance holes is fixedly sealed with the single cell housing; The liquid cooling plate is arranged on the top plate of the housing. After the polarity terminals of each single cell extend out of the avoidance holes, they pass through the heat conducting holes of the heat conducting members.

8. The large-capacity battery according to claim 7, wherein Edges extending along the x direction are respectively arranged on both sides of the top plate of the housing, and the liquid cooling plate is embedded and installed inside the edges.

9. The large-capacity battery according to claim 7, characterized in that, An insulating sealing glue layer is laid between the top plate of the housing and the liquid cooling plate, and the gap between each single cell polarity terminal and the avoidance hole is filled with an insulating sealing glue layer. An insulating protective cover is arranged at the top of the housing, and each single cell polarity terminal and the liquid cooling plate are located inside the insulating protective cover.

10. The large-capacity battery according to any one of claims 7 to 9, characterized in that The sharing chamber includes an electrolyte sharing chamber and a gas sharing chamber; The electrolyte sharing chamber is communicated with the electrolyte areas of each single cell; The gas sharing chamber is communicated with the gas areas of each single cell, or the gas sharing chamber is a gas channel located between the top plate of the housing and each single cell, and the gas channel covers the explosion vent film of each single cell. When the explosion vent film of any single cell is broken by the hot runaway flue gas in the inner cavity, the gas area of the single cell is communicated with the gas channel.

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