Liquid cooling device and high-capacity battery

Abstract

The invention 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 present application belongs to the field of batteries, and particularly relates to a liquid cooling device and a large-capacity battery. BACKGROUND

[0002] At present, a plurality of single batteries are connected in parallel or in series to form a large-capacity battery (also referred to as a battery module or a battery pack). However, the single batteries in the large-capacity battery have differences, which greatly limits the capacity upper limit and the cycle number of the large-capacity battery.

[0003] In order to solve the above problems, the present application provides a large-capacity battery, which comprises a shell and a plurality of single batteries. The plurality of single batteries are arranged in the shell, and the differences between the single batteries are reduced by a shared chamber in the shell, which improves the consistency between the single batteries to some 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, high integration and high energy density. However, due to the high concentration of single batteries in the large-capacity battery, a large amount of heat will be generated during charging and discharging, and the 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 destroyed, causing safety hazards. SUMMARY

[0005] The present application provides a liquid cooling device and a large-capacity battery, which mainly solves the problem of safety hazards existing in the existing large-capacity battery.

[0006] To solve the above problems, the technical scheme provided by the present application is as follows:

[0007] A liquid cooling device comprises at least one liquid cooling plate and a plurality of heat-conducting pieces. The liquid cooling plate is provided with a liquid cooling channel through which a heat transfer medium passes, and an inlet and an outlet communicating 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. The plurality of heat-conducting pieces are embedded in the through holes one by one, and each heat-conducting piece is provided with a heat-conducting hole through which a polar terminal of a large-capacity battery passes. The liquid cooling plate is insulated from the polar terminal of the large-capacity battery.

[0008] Further, the liquid cooling plate is two, and each liquid cooling plate is provided with a group of heat-conducting pieces arranged in sequence along the x direction. The inlet of one liquid cooling plate and the outlet of the other liquid cooling plate are connected by a connecting pipe.

[0009] Further, the liquid cooling plate is one, and the liquid cooling plate is provided with two groups of heat-conducting pieces arranged in sequence along the x direction.

[0010] Further, the liquid cooling plate is provided with a partition plate, which divides 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 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, the bottom of the liquid cooling plate is provided with an avoiding groove for avoiding the gas sharing chamber of the large capacity battery.

[0012] Further, the top end and the bottom end of the heat conduction piece are respectively provided with circumferentially protruding annular folded edges, after the heat conduction piece passes through the through hole of the liquid cooling plate, the annular folded edge of the top end of the heat conduction piece is sealingly connected with the top plate of the liquid cooling plate, and the annular folded edge of the bottom end of the heat conduction piece is sealingly connected with the bottom plate of the liquid cooling plate.

[0013] The application also provides a large capacity battery, which comprises a shell, a plurality of single batteries and the above-mentioned liquid cooling device; the plurality of single batteries are arranged in the shell along the same x direction; the shell is provided with a sharing chamber, the inner cavity of the sharing chamber and the inner cavities of all the single batteries are communicated; the top plate of the shell is provided with avoiding holes corresponding to the polarity terminals of the single batteries; the polarity terminals of the single batteries protrude out of the avoiding holes, and the region of the top plate of the shell corresponding to the avoiding holes is fixedly sealed with the shell of the single battery; the liquid cooling plate is arranged on the top plate of the shell, and the polarity terminals of the single batteries protrude out of the avoiding holes and pass through the heat conduction holes of the heat conduction piece.

[0014] Further, the top plate of the shell is provided with a blocking edge extending along the x direction on each side, and the liquid cooling plate is embedded and installed on the inner side of the blocking edge.

[0015] Further, an insulating sealing adhesive layer is laid between the top plate of the shell and the liquid cooling plate, and the gap between the polarity terminals of the single batteries and the avoiding holes is filled with the insulating sealing adhesive layer, the top of the shell is provided with an insulating protective cover, and the polarity terminals of the single batteries and the liquid cooling plate are located in the insulating protective cover.

[0016] Further, the sharing chamber comprises an electrolyte sharing chamber and a gas sharing chamber; the electrolyte sharing chamber is communicated with the electrolyte area of each single battery; the gas sharing chamber is communicated with the gas area of each single battery, or the gas sharing chamber is a gas channel located between the top plate of the shell and each single battery, the gas channel covers the explosion relief membrane of each single battery, and when the explosion relief membrane of any single battery is broken by the inner cavity thermal runaway smoke, the gas area of the single battery and the gas channel are communicated.

[0017] Compared with the prior art, the technical scheme of the application has the following advantages:

[0018] 1. The liquid cooling device provided by the present application comprises a liquid cooling plate and a plurality of heat-conducting members, and after the liquid cooling device is installed on the top of the large-capacity battery, the bottom of the liquid cooling plate exchanges heat with the top plate of the shell of the large-capacity battery, and the heat-conducting members of the liquid cooling plate exchange heat with the polarity terminals of the large-capacity battery. This heat exchange mode effectively controls the temperature at different positions of the entire large-capacity battery, avoids performance problems and safety problems caused by excessively high or low temperature of the large-capacity battery, and improves 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 effect when the heat transfer medium passes through the liquid cooling channel, so that the heat transfer medium fully exchanges heat with the polarity terminals and the top of the large-capacity battery, and then the cooling effect of the liquid cooling plate.

[0019] 2. In the liquid cooling device of the present application, the liquid cooling plate is two, and a group of heat-conducting members arranged in the x direction are arranged on each liquid cooling plate. 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 arrangement makes the liquid inlet and liquid outlet on the top of the liquid cooling plate of the large-capacity battery located on the same side of the liquid cooling plate, which is convenient for assembling the large-capacity battery and easy to connect with the external pipeline, thereby improving the connectability of the pipeline and the compactness of the pipeline arrangement.

[0020] 3. In the liquid cooling device of the present application, the liquid cooling plate is one, and two groups of heat-conducting members arranged in the x direction are arranged on the liquid cooling plate. Each heat-conducting member is insulated from the polarity terminals of the large-capacity battery. The liquid cooling plate with this structure can exchange heat with the positive polarity terminal and the negative polarity terminal of the large-capacity battery through one liquid cooling plate. At the same time, the liquid cooling plate with this structure has a simple structure and is easy to install.

[0021] 4. In the liquid cooling device of the present application, a partition is arranged in 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 communicating with the liquid inlet exchanges heat with the positive polarity terminal of the large-capacity battery, and the liquid cooling channel communicating with the liquid outlet exchanges heat with the positive polarity terminal of the large-capacity battery. When the large-capacity battery is working, the temperature of the positive polarity terminal is higher than that of the negative polarity terminal. This arrangement makes the heat transfer medium in the liquid cooling plate first exchange heat with the positive polarity terminal with higher temperature and then exchange heat with the negative polarity terminal, so that the temperatures of the positive polarity terminal and the negative polarity terminal are relatively balanced, thereby improving the reliability of the large-capacity battery when working.

[0022] 5. In the liquid cooling device of the present application, the bottom of the liquid cooling plate is also provided with an avoiding groove for avoiding the gas sharing chamber of the large-capacity battery. The avoiding groove makes the liquid cooling plate 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 the polarity terminals of the large-capacity battery, but also exchanges heat with the gas sharing chamber of the large-capacity battery, thereby improving the heat exchange effect.

[0023] 6. In the large-capacity battery of the present application, the shared chamber includes an electrolyte shared chamber and a gas shared chamber; the electrolyte shared chamber and the electrolyte area in the inner cavity of each single battery in the shell are connected, so that the electrolyte of each single battery is shared to ensure the consistency of each single battery, thereby improving the cycle life of the large-capacity battery to a certain extent. The gas shared chamber and the gas area in the inner cavity of each single battery in the shell are connected, so that the gas of each single battery is balanced, thereby improving the consistency between each single battery to a certain extent, thereby improving the cycle life of the large-capacity battery to a certain extent.

[0024] 7. In the large-capacity battery of the present application, an insulating sealing adhesive layer is laid between the top plate of the shell 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 polarity terminal and the avoidance hole under the blockage of the insulating sealing adhesive layer, thereby preventing the short circuit of the large-capacity battery. In addition, the large-capacity battery uses an insulating protective cover to provide insulation protection for the polarity terminal and the liquid cooling plate, avoiding the safety hazards that may exist when the polarity terminal is exposed during the operation of the large-capacity battery, and also avoiding the problem that some foreign matters in the external environment fall into the position of the polarity terminal to cause the short circuit of the large-capacity battery, thereby improving the safety of the large-capacity battery.

[0025] Other advantages, objects, and features of the present application will be apparent from the following description, and will be understood by persons skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0027] Figure 1 It is a structural schematic diagram of the prior large-capacity battery;

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

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

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

[0031] Figure 5 It is a cross-sectional view of the liquid cooling plate in embodiment 1;

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

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

[0034] Figure 8 Structural schematic diagram of liquid cooling plate (with relief groove) in Example 1;

[0035] Figure 9 Schematic diagram of installation of liquid cooling plate with relief groove in Example 1 and large capacity battery;

[0036] Figure 10 Schematic diagram of installation of liquid cooling plate and large capacity battery in Example 2;

[0037] Figure 11 Structural schematic diagram of liquid cooling plate in Example 2;

[0038] Figure 12 Exploded view of liquid cooling plate in Example 2;

[0039] Figure 13 Sectional view of liquid cooling plate (with partition) in Example 2;

[0040] Figure 14 Structural schematic diagram of liquid cooling plate (with relief groove) in Example 2;

[0041] Figure 15 Structural schematic diagram of large capacity battery in Example 3;

[0042] Figure 16 Exploded view of large capacity battery and liquid cooling device in Example 3 Figure 1 ;

[0043] Figure 17 Exploded view of large capacity battery and liquid cooling device in Example 3 Figure 2 ;

[0044] Figure 18 Structural schematic diagram of large capacity battery (shell with flange) and liquid cooling device in Example 3;

[0045] Figure 19 Exploded view of large capacity battery (shell with flange) and liquid cooling device in Example 3;

[0046] Figure 20 Structural schematic diagram of large capacity battery in Example 4.

[0047] Reference numerals: 1-large capacity battery, 2-liquid cooling device, 11-housing, 12-single battery, 13-polarity terminal, 14-explosion venting mechanism, 15-insulation shield, 16-first electrical connector, 17-second electrical connector, 111-electrolyte sharing chamber, 112-gas sharing chamber, 113-retaining rim, 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-separation plate, 221-heat conducting hole, 222-annular folded edge. DETAILED DESCRIPTION

[0048] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0049] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0050] In the description of the present application, it should be noted that the orientation or positional relationship of the terms "top, bottom, etc." is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application. In addition, the terms "first, second, etc." are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0051] As Figure 1As shown, to increase the capacity limit and cycle life of the high-capacity battery 1, the present invention arranges multiple individual cells 12 in the same direction within a housing 11. The top plate of the housing 11 has clearance holes that allow the polarity terminals 13 of each individual cell 12 to extend. Simultaneously, the housing 11 has a shared chamber, with the inner cavity of each individual cell 12 communicating with the shared chamber of the housing 11. This shared chamber may include a gas shared chamber 112 located at the top of the housing 11 and an electrolyte shared chamber 111 located at the bottom of the housing. This shared chamber reduces the differences between the individual cells 12, improving their consistency to some extent, thereby increasing the cycle life of the high-capacity battery 1. The housing 11 is typically rectangular. For ease of description, the length direction of the housing 11 is defined as the x-direction, the width direction as the y-direction, and the height direction as the z-direction.

[0052] To improve the reliability of the aforementioned high-capacity battery during operation, this invention provides a liquid cooling device. This device includes at least one liquid cooling plate and multiple heat-conducting components disposed on the liquid cooling plate. The liquid cooling device is primarily located on the top of the high-capacity battery and is fitted onto the battery's polarity terminals. This device can exchange heat not only with the top casing of the high-capacity battery but also with its polarity terminals. During normal use of the high-capacity battery, the liquid cooling device effectively exchanges heat with multiple areas of the battery, ensuring effective temperature control at different locations throughout the battery. This avoids performance and safety issues caused by excessively high or low temperatures, thereby improving the battery's performance and reliability.

[0053] Example 1

[0054] like Figure 2 As shown, this embodiment provides a liquid cooling device 2, which is installed on 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] like Figure 3 , Figure 4 and Figure 5As shown, the liquid cooling device 2 in this embodiment includes two liquid cooling plates 21 and multiple heat-conducting components 22. The liquid cooling plates 21 are provided with liquid cooling channels 211 through which the heat transfer medium passes, and also have inlet ports 212 and outlet ports 213 communicating with the liquid cooling channels 211. The heat transfer medium enters the liquid cooling channels 211 through the inlet port 212, exchanges heat with the large-capacity battery 1, and then flows out through the outlet port 213. When the temperature of the large-capacity battery 1 is higher than a set threshold, a lower-temperature heat transfer medium is introduced into the liquid cooling channels 211 of the liquid cooling plates 21 to exchange heat with the large-capacity battery 1, thereby cooling the large-capacity battery 1. When the temperature of the large-capacity battery 1 is lower than the set threshold, a higher-temperature heat transfer medium is introduced into the liquid cooling plates 21 to heat 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 its normal operating temperature.

[0056] In this embodiment, the liquid cooling plate 21 is a rectangular plate, and the length of the rectangular plate is the same as the length of the outer casing 11 of the high-capacity battery 1. The rectangular plate is provided with through holes 214 arranged sequentially along the x-direction and penetrating the liquid cooling plate 21 in the z-direction. Here, the through holes 214 refer to the through holes 214 penetrating the top plate and the bottom plate of the liquid cooling plate 21.

[0057] In this embodiment, as Figure 4 As shown, the through holes 214 on the liquid cooling plate 21 are a group, and this group of through holes 214 are arranged sequentially along the x-direction. The number of through holes 214 is the same as the number of individual cells 12 in the large-capacity battery 1. The same number of heat-conducting components 22 as the number of individual cells 12 are embedded one-to-one into the through holes 214, sealing the through holes 214 to prevent the heat transfer medium in the liquid cooling channel from flowing out through the through holes 214. Simultaneously, the distance between adjacent heat-conducting components 22 is consistent with the distance between adjacent polarity terminals 13 in the large-capacity battery 1.

[0058] In this embodiment, the heat-conducting element 22 is a cylindrical structure with a cross-sectional shape identical to that of the through hole 214. Furthermore, the length of the heat-conducting element 22 is greater than or equal to the thickness of the liquid cooling plate 21. If the length of the heat-conducting element 22 (i.e., its length in the z-direction) is greater than the thickness of the liquid cooling plate 21, then the bottom end of the heat-conducting element 22 must be on the same plane as the bottom plate of the liquid cooling plate 21 to allow the bottom plate of the liquid cooling plate 21 to contact the top plate of the large-capacity battery 1 casing 11 for heat exchange. If the bottom end of the heat-conducting element 22 protrudes beyond the bottom plate of the liquid cooling plate 21, a gap will exist between the bottom plate of the liquid cooling plate 21 and the top plate of the large-capacity battery 1 casing 11, thus affecting the heat exchange effect between the liquid cooling plate 21 and the top plate of the large-capacity battery 1 casing 11. Ideally, the length of the heat-conducting component 22 is the same as the thickness of the liquid cooling plate 21. In this case, the top end of the heat-conducting component 22 is on the same plane as the top plate of the liquid cooling plate 21, and the bottom end of the heat-conducting component 22 is on the same plane as the bottom plate of the liquid cooling plate 21, which facilitates the installation of the liquid cooling plate 21.

[0059] like Figure 4 As shown, each of the above-mentioned heat-conducting components 22 is provided with a heat-conducting hole 221 through which the polar terminal 13 of the high-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 high-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 on the heat-conducting component 22, the heat-conducting component 22 is specifically a hollow thin-walled structure. The thinner the wall thickness of the thin-walled structure, the better the heat exchange effect with the polar terminal 13 of the high-capacity battery 1.

[0060] In addition, the thickness of the liquid cooling plate 21 and the length of the heat-conducting component 22 should be less than the height of the polar terminal of the large-capacity battery. After the liquid cooling plate 21 is installed on the polar terminal of the large-capacity battery, the top of the polar terminal of the large-capacity battery can extend out of the heat-conducting component 22 so that the polar terminal of the large-capacity battery can be electrically connected.

[0061] During manufacturing, the heat-conducting component 22 can be integrally formed with the liquid cooling plate 21, in which case the heat-conducting component 22 is made of the same material as the liquid cooling plate 21; alternatively, the heat-conducting component 22 can be manufactured separately from the liquid cooling plate 21, and then the heat-conducting component 22 is embedded into the through hole 214 of the liquid cooling plate 21. After the heat-conducting component 22 is embedded into the through hole 214 of the liquid cooling plate 21, the top end of the heat-conducting component 22 can be sealed to the area around the through hole 214 of the top plate of the liquid cooling plate 21, and the bottom end of the heat-conducting component 22 can be sealed to the area around the through hole 214 of the bottom plate of the liquid cooling plate 21.

[0062] like Figure 5 As shown in this embodiment, to ensure the reliability and sealing of the connection between the heat-conducting component 22 and the liquid-cooled plate 21, circumferentially protruding annular flanges 222 can be provided at the top and bottom of the heat-conducting component 22. After the heat-conducting component 22 passes through the through hole 214 of the liquid-cooled plate 21, the annular flange 222 at the top of the heat-conducting component 22 achieves a sealed connection with the top plate of the liquid-cooled plate 21, and the annular flange 222 at the bottom of the heat-conducting component 22 achieves a fixed connection with the bottom plate of the liquid-cooled plate 21. The sealed connection can be achieved by welding. Furthermore, countersunk holes can be machined at the positions where the through hole 214 is provided on the top and bottom plates of the liquid-cooled plate 21. In this case, the annular flange 222 on the heat-conducting component 22 cooperates with the countersunk hole on the liquid-cooled plate 21 to achieve a fixed connection.

[0063] In this embodiment, a set of heat-conducting elements 22 arranged sequentially along the x-direction are provided on the liquid cooling plate 21. The liquid cooling plate 21 is mounted on the polar terminal 13 on one side of the large-capacity battery 1. When the temperature of the large-capacity battery 1 is controlled, each large-capacity battery 1 is provided with two liquid cooling plates 21. The liquid cooling plates 21 can specifically control the temperature of the large-capacity battery in the following ways:

[0064] Parallel connection: such asFigure 6 As shown, the two liquid cooling plates 21 have liquid inlet 212 and liquid outlet 213 respectively. The liquid inlet 212 and liquid outlet 213 of the two liquid cooling plates 21 are 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: such as Figure 7 As shown, each high-capacity battery 1 is equipped with two independent liquid cooling plates 21. The liquid inlet 212 and liquid outlet 213 of the two liquid cooling plates 21 are connected by a connecting pipe 24. After connection, the liquid inlet 212 of one liquid cooling plate 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 high-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, they have an inlet 212 and an outlet 213 connected to an external pipeline. At this time, the liquid cooling channel 211 connected to the inlet 212 exchanges heat with the positive terminal 131 of the large-capacity battery 1, and the liquid cooling channel 211 connected to the 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 of the large-capacity battery 1 during operation.

[0067] After the two liquid cooling plates 21 are installed on 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 of the large-capacity battery 1 during operation, the liquid cooling plates 21 are insulated from the polarity terminals 13 of the large-capacity battery 1. This insulation can be achieved in the following ways:

[0068] First, the positive terminal 131 and negative terminal 132 of the high-capacity battery are insulated.

[0069] Insulation treatment is applied to the polar terminals 13 of each individual battery cell 12. Specifically, an insulating layer is provided on the part of each individual battery cell 12 polar terminal 13 that contacts the heat-conducting component 22. The insulating layer can be a boron nitride or aluminum oxide, copper fluoride or other ceramic coating, or an insulating varnish layer formed by coating, or a hard oxide layer formed after oxidation treatment, or an enamel insulating layer, etc. In specific configuration, the insulating layer is formed on the side wall of the polar terminal 13.

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

[0071] An insulating sleeve is provided between the polar terminal 13 of the high-capacity battery and the heat-conducting component 22. For example, the insulating sleeve is an insulating plastic sleeve, an insulating rubber sleeve, or a heat-conducting ceramic sleeve.

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

[0073] If the heat-conducting component 22 and the liquid cooling plate 21 are processed separately and then assembled, the heat-conducting component 22 can be made of insulating material, such as insulating rubber. If the heat-conducting component 22 and the liquid cooling plate 21 are integrally formed, an insulating layer can be provided on the inner wall of the heat-conducting component 22 to ensure the insulation between the liquid cooling plate 21 and the high-capacity battery 1 during use. The insulating layer can specifically be a ceramic coating (boron nitride or aluminum oxide, copper fluoride coating), insulating varnish, enamel insulating layer, or hard oxide layer, etc.

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

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

[0076] The liquid cooling plate 21 is made of insulating material, or the entire inner and outer surfaces of the 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, such as Figure 8 and Figure 9 As shown, when the liquid cooling plate 21 is placed on the large-capacity battery 1, the bottom of the liquid cooling plate 21 is also provided with a clearance groove 23 to avoid the gas sharing chamber 112 of the large-capacity battery 1. The clearance 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 with clearance grooves 23 are installed on the top of the large-capacity battery 1, the clearance grooves of the two liquid cooling plates 21 are adjacent to each other to form a groove. At this time, the gas sharing chamber 112 of the large-capacity battery 1 is embedded in the groove. The clearance groove 23 makes the bottom of the two liquid cooling plates 21 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 handles the heat at the top plate and polarity terminal 13 of the large-capacity battery 1, but also exchanges heat with the gas sharing chamber 112 of the large-capacity battery 1, thereby improving the heat exchange effect.

[0078] Example 2

[0079] like 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, the liquid cooling plate 21 of the liquid cooling device 2 is provided with two sets of heat-conducting elements 22 arranged sequentially along the x direction, so that the liquid cooling plate 21 can exchange heat with the top of the large-capacity battery 1, as well as with the positive terminal 131 and the negative terminal 132 of the large-capacity battery 1.

[0080] like Figure 11 and Figure 12 As shown, in this embodiment, the length and width of the liquid cooling plate 21 are the same as the length of the top plate of the large-capacity battery 1. The liquid cooling plate 21 has two sets of through holes 214 arranged sequentially along the x-direction. The number of through holes 214 is twice the number of individual batteries. The distance between the two sets 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 sets of heat-conducting elements 22 are respectively provided within the two sets of through holes 214. One set of heat-conducting elements 22 exchanges heat with the positive terminal 131 of the large-capacity battery 1, and the other set of heat-conducting elements 22 exchanges heat with the negative terminal 132 of the large-capacity battery 1. The structure of the heat-conducting elements 22 and their cooperation with the liquid cooling plate 21 are similar to those in Embodiment 1.

[0081] To improve the heat exchange efficiency of the heat transfer medium, such as Figure 13 As shown, this embodiment also includes a partition 215 within the liquid cooling plate 21, dividing the liquid cooling channel 211 into a U-shaped liquid cooling channel. In this case, the liquid inlet 212 and the liquid outlet 213 of the liquid cooling plate 21 are located on the same sidewall of the liquid cooling plate 21. Positioning the liquid inlet 212 and the liquid outlet 213 on the same sidewall of the liquid cooling plate 21 facilitates easy connection of the large-capacity battery 1 to external pipelines when assembled into an energy storage device, improving pipeline connectivity and the compactness of the pipeline layout.

[0082] Furthermore, 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 connected to the liquid inlet 212 exchanges heat with the positive terminal 131 of the large-capacity battery 1, and the liquid cooling channel 211 connected to 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 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 of the large-capacity battery 1 during operation.

[0083] like Figure 14As shown, if the gas-sharing chamber 112 in the large-capacity battery 1 protrudes from the top of the outer casing 11, a clearance groove 23 can be provided at the bottom of the liquid cooling plate 21 to avoid the gas-sharing chamber 112 of the large-capacity battery 1. The clearance groove 23 is a strip-shaped groove that 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 handles the heat at the top plate and polarity terminal 13 of the large-capacity battery 1, but also exchanges heat with the gas-sharing chamber 112 of the large-capacity battery 1.

[0084] After the liquid cooling plate 21 is installed on top of the large-capacity battery 1, it exchanges heat with the positive terminal 131 of the large-capacity battery 1 and with the negative terminal 132 of the large-capacity battery 1. In order to ensure the safety of the large-capacity battery 1 during operation, the liquid cooling plate 21 and the polarity terminal 13 of the large-capacity battery 1 need to be insulated. The specific insulation method is the same as 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 placed on top of the casing 11 of the large-capacity battery 1 and comes into contact with the casing 11, insulation must be ensured between the liquid cooling plate 21 and the large-capacity battery 1 when the casing 11 of the large-capacity battery 1 is energized. This can usually be achieved by insulating the casing 11 of the large-capacity battery 1 or the liquid cooling plate 21, such as by spraying insulating paint or covering the surface of the casing 11 of the large-capacity battery 1 or the liquid cooling plate 21, or by adding an insulating pad between the two.

[0086] Example 3

[0087] like Figure 15 As shown, this embodiment provides a high-capacity battery 1, which includes a casing 11 and N individual battery cells 12, where N is an integer greater than 1. In this embodiment, the individual battery cells 12 are prismatic cells, and the number can be adjusted according to actual needs. The inner cavity of each individual battery cell 12 includes an electrolyte region and a gas region.

[0088] like Figure 1 and Figure 15As shown, in this embodiment, after N individual battery cells 12 are arranged in the same x-direction inside the housing 11, the top plate of the housing 11 is provided with clearance holes corresponding to the polarity terminals 13 of each individual battery cell 12. The polarity terminals 13 of each individual battery cell 12 extend out of the corresponding clearance holes as the polarity terminals 13 of the large-capacity battery 1 (the polarity terminals 13 of all individual battery cells 12 located on one side are the positive polarity terminals 131 of the large-capacity battery 1, and the polarity terminals 13 of all individual battery cells 12 located on the other side are the negative polarity terminals 132 of the large-capacity battery 1). The area of ​​the top plate of the housing 11 corresponding to the clearance hole is fixedly sealed with the housing of the individual battery cell 12, so that the gap between the polarity terminals 13 and the clearance holes is sealed. Usually, a sealing connector can be used to achieve the fixed sealing between the area of ​​the top plate of the housing 11 and the housing of the individual battery cell 12. The sealing connector may include a hollow component (similar to a hollow tube), which is sleeved on the outside of the polarity terminal 13 of the single cell 12; the bottom of the hollow component is sealed to the area around the polarity terminal 13 on the upper cover of the single cell 12, and the top of the hollow component is sealed to the area of ​​the top plate of the outer casing 11 corresponding to the clearance hole. The sealing connection can be achieved by welding.

[0089] It should be noted that the polarity terminal of the single cell 12 here can be the terminal post of the single cell 12. In order to prevent the terminal post of the single cell 12 from not being able to extend smoothly out of the clearance hole as a polarity terminal, a terminal post adapter can be connected to the terminal post of the single cell 12, and the overall structure of the terminal post of the single cell 12 and the terminal post adapter can be used as the polarity terminal of the single cell 12.

[0090] The aforementioned outer casing 11 has a shared chamber, the inner cavity of which is connected to the inner cavities of all individual battery cells 12. By placing multiple individual battery cells 12 within an outer casing 11 with the shared chamber, and utilizing the connection between this shared chamber and the inner cavities of each individual battery cell 12 within the casing 11, the differences between the individual battery cells 12 are reduced, improving the consistency among them to some extent, thereby enhancing the cycle life of the high-capacity battery 1 to a certain degree. The shared chamber specifically includes the following types:

[0091] The shared chamber within the outer casing 11 can be an electrolyte sharing chamber 111. The inner cavity of the electrolyte sharing chamber 111 is connected to the electrolyte area of ​​all individual battery cells 12. Through the electrolyte sharing chamber 111, each individual battery cell 12 is placed in a uniform electrolyte environment, ensuring the uniformity of the electrolyte within each individual battery cell 12 and improving the performance and charge-discharge cycle life of the large-capacity battery 1. It should be noted that the electrolyte sharing chamber 111 is an electrolyte containing chamber. After it is connected to the electrolyte area of ​​each individual battery 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 within the aforementioned outer casing 11 can be a gas-sharing chamber 112. The inner cavity of the gas-sharing chamber 112 is connected to the gas region of the inner cavity of all individual battery cells 12. Gas balance among the individual battery cells 12 is achieved through the gas-sharing chamber 112, which also improves the performance and charge-discharge cycle life of the large-capacity battery 1. In this structure, the upper cover of the individual battery cell 12 has a gas port that communicates with the inner cavity of the individual battery cell 12. The inner cavity of the gas-sharing chamber 112 is connected to the gas region of the inner cavity of each individual battery cell 12 through this gas port. Based on the gas-sharing chamber 112, the gas regions of each individual battery cell 12 can be connected, achieving gas balance.

[0093] The aforementioned shared chamber can be a gas-liquid shared chamber. The inner cavity of the gas-liquid shared chamber is connected to the electrolyte area and gas area of ​​all individual battery cells 12. Through a gas-liquid shared chamber, each individual battery cell 12 can be in a unified electrolyte and gas environment, improving the performance and charge-discharge cycle life of the large-capacity battery 1. Specifically, the side plate of the outer casing 11 has a protrusion extending along the arrangement direction of the individual battery cells 12, forming a gas-liquid shared chamber at the protrusion. This gas-liquid shared chamber is connected to the electrolyte area and gas area of ​​each individual battery cell 12.

[0094] The aforementioned shared chamber may also include an electrolyte shared chamber 111 and a gas shared chamber 112. The inner cavity of the electrolyte shared chamber 111 is connected to the electrolyte region of all individual battery cells 12, and the inner cavity of the gas shared chamber 112 is connected to the gas region of all individual battery cells 12. The aforementioned high-capacity battery 1 places multiple individual battery cells 12 inside a housing 11 with a shared chamber. By utilizing the connection between the shared chamber and the inner cavity of each individual battery cell 12 located within the housing 11, the electrolyte and gas of each individual battery cell 12 are shared, thereby ensuring the consistency of each individual battery cell 12. That is, by connecting the electrolyte and gas of each individual battery cell 12, the electrolyte and gas of all individual battery cells 12 are in the same system, reducing the differences between individual battery cells 12 and improving the consistency between individual battery cells 12 to a certain extent, thus improving the cycle life of the high-capacity battery 1 to a certain extent.

[0095] The aforementioned shared chamber may also include an electrolyte shared chamber 111 and a gas shared chamber 112. The inner cavity of the electrolyte shared chamber 111 is connected to the electrolyte area of ​​the inner cavity of all individual cells 12. The gas shared chamber 112 is a gas channel located between the top plate of the outer casing 11 and each individual cell 12. This gas channel covers the explosion venting membrane on the top of each individual cell 12. When the explosion venting membrane of any individual cell 12 is ruptured by the thermal runaway flue gas in the inner cavity, the gas area of ​​the inner cavity of that individual cell 12 is connected to the inner cavity of the gas chamber. The gas shared chamber 112 is used as an explosion venting channel. That is, during normal operation of the large-capacity battery 1, the inner cavity of each individual cell 12 is not connected to the explosion venting channel. When any individual cell 12 experiences thermal runaway, the explosion venting membrane on the top of that individual cell 12 is opened by the flue gas in the inner cavity, and the inner cavity of that individual cell 12 is connected to the explosion venting channel. The thermal runaway flue gas is discharged through the explosion venting channel, improving the safety of the large-capacity battery 1.

[0096] The outer shell 11, which includes a gas-sharing chamber 112 and an electrolyte-sharing chamber 111, can be implemented using the following structure:

[0097] 1) The outer casing 11 includes a cylindrical body, an upper cover plate, and a lower cover plate; the top and bottom of the cylindrical body are open, the upper cover plate is sealed and fixed (welded) to the top of the cylindrical body, and the upper cover plate has clearance holes that allow the terminals of each individual battery 12 to extend out. The lower cover plate is sealed and fixed (welded) to the bottom of the cylindrical body. At the same time, the upper cover plate has a protrusion extending along the arrangement direction of the individual battery 12, forming a gas sharing chamber 112 at the protrusion. The lower cover plate has a protrusion extending along the arrangement direction of the individual battery 12, forming an electrolyte sharing chamber 111 at the protrusion.

[0098] 2) The outer casing 11 includes a U-shaped casing, a first cover plate, a third cover plate, and a second cover plate; the first cover plate and the third cover plate respectively cover the two opposite open ends of the U-shaped casing; the second cover plate covers the top open end of the U-shaped casing and is sealed to the open end, and the second cover plate has clearance holes that allow the terminals of each individual battery 12 to extend out. At the same time, the second cover plate has a protrusion extending along the arrangement direction of the individual battery 12, and a gas sharing chamber 112 is formed at the protrusion. The bottom of the U-shaped casing has an electrolyte sharing chamber 111, which is a liquid channel between the bottom plate of the outer casing 11 and each individual battery 12.

[0099] 3) The outer casing 11 includes a cylindrical body, a first end plate, and a second end plate; the front and rear parts of the cylindrical body are open, the first end plate is sealed and fixed (welded) to the front part of the cylindrical body, and the second end plate is sealed and fixed (welded) to the rear part of the cylindrical body. The top of the cylindrical body has a clearance hole that allows the terminals of each individual battery 12 to extend out, and the top of the cylindrical body has a protrusion extending along the arrangement direction of the individual batteries 12, forming a gas sharing chamber 112 at the protrusion. The bottom of the cylindrical body has an electrolyte sharing chamber 111, which is a liquid channel between the bottom plate or support plate of the cylindrical body and the bottom of each individual battery 12.

[0100] like Figure 15 As shown, to further enhance the safety of the large-capacity battery 1 during use, a venting mechanism 14 communicating with the inner cavity of the outer casing 11 is provided on the outer casing 11 of the large-capacity battery 1. The venting mechanism 14 specifically includes a venting pipe and a venting section. One end of the venting pipe is connected to the venting port of the large-capacity battery 1, and the other end is connected to the flue gas pipeline. The venting section is located on the venting pipe or on the venting port of the large-capacity battery 1. Specifically, the venting section can be a venting membrane or a venting valve. This venting mechanism 14 ensures that the thermal runaway flue gas inside the large-capacity battery 1 can be smoothly discharged in the event of thermal runaway, avoiding safety hazards such as explosions inside the outer casing 11 of the large-capacity battery 1. Specifically, at least one of the electrolyte sharing chamber 111 and the gas sharing chamber 112 is connected to the venting mechanism 14. When both the electrolyte shared chamber 111 and the gas shared chamber 112 are connected to the explosion relief mechanism 14, the outer casing 11 of the large-capacity battery 1 is provided with two sets of explosion relief mechanisms 14. The two sets of explosion relief mechanisms 14 are connected to the electrolyte shared chamber 111 and the gas shared chamber 112 respectively. This arrangement gives the large-capacity battery 1 two explosion relief channels. When any single cell 12 experiences thermal runaway, the thermal runaway smoke is discharged from different explosion relief channels. In a short time, the heat and thermal runaway smoke accumulated in the explosion relief channels and the single cell 12 can be reduced, thereby reducing the risk of explosion.

[0101] like Figure 16 , Figure 17 and Figure 20 As shown, based on the above structure, the large-capacity battery in this embodiment also includes the liquid cooling device of Embodiment 1 or Embodiment 2. The liquid cooling plate of the liquid cooling device is disposed on the top plate of the outer casing. After the polarity terminals of each individual battery extend out of the clearance hole, they pass through the heat conduction holes of the heat conduction component. After the end face of the polarity terminal 13 of each individual battery 12 extends out of the liquid cooling plate 21, it is used to connect with the first electrical connector 16 or the second electrical connector 17. The electrical connector is a connecting device for realizing the parallel connection of each individual battery 12, and the second electrical connector 17 is a connecting device for realizing the series connection of two large-capacity batteries 1, or it can 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-conducting components of the liquid cooling plate exchange heat with the polarity terminals of the large-capacity battery. This heat exchange method effectively controls the temperature at different locations of the entire large-capacity battery, avoiding performance and safety issues caused by excessively high or low temperatures, and improving the performance and safety of the large-capacity battery.

[0103] like Figure 18 and Figure 19 As shown, in this embodiment, the top plate of the outer casing 11 has baffles 113 extending along the x-direction on both sides. The liquid cooling plate 21 is embedded and installed inside the baffles 113. After the liquid cooling plate 21 is installed, the baffles 113 can position and limit the liquid cooling plate 21, and also protect the liquid cooling plate 21. When the liquid cooling plate 21 is subjected to external impact or force, the liquid cooling plate 21 may exert pressure on the polar terminals of the large-capacity battery along the x-direction or y-direction, thereby affecting the sealing performance of the connection between the outer casing and the individual battery casings, which may affect the performance of the large-capacity battery. By providing baffles 113 extending along the x-direction on both sides of the top plate of the outer casing 11 to protect the liquid cooling plate 21, the above-mentioned problems can be avoided.

[0104] After the liquid cooling plate 21 is installed on the top of the outer casing 11, since the liquid cooling plate 21 is fitted onto the polarity terminal of the large-capacity battery, it has already been positioned and installed accordingly in the x and y directions. In the z direction, it can be fixed in the following ways: First, multiple mounting plates are welded onto the liquid cooling plate 21, and these mounting plates are fixed to the outer casing with bolts; Second, multiple U-shaped connecting plates are provided on the top of the liquid cooling plate 21. When connecting, the U-shaped connecting plates are inverted and snapped onto the liquid cooling plate 21, and the two side plates of the U-shaped connecting plates are fixed to the side wall of the outer casing by bolts or welding; Third, threaded holes are machined on the side wall of the outer casing 11, and threaded holes are also machined on the liquid cooling plate 21. The liquid cooling plate 21 is fixed to the outer casing 11 with screws. This method requires that the wall thickness of the outer casing 11 and the wall thickness of the liquid cooling plate 21 meet the requirements.

[0105] Example 4

[0106] During long-term use, due to the temperature difference between the inside and outside of the liquid cooling plate 21, condensation will form on the surface of the large-capacity battery 1. When the condensation accumulates to a certain amount, it will seep into the gap between the polar terminal 13 of the single cell 12 and the clearance hole, causing the polar terminal 13 of the single cell 12 to conduct electricity with the outer casing 11, which may lead to a short circuit of the same single cell 12.

[0107] This embodiment optimizes the structure of the high-capacity battery 1 in Embodiment 3. For example... Figure 20As shown, an insulating sealant layer is laid between the top plate of the outer casing 11 and the liquid cooling plate 21, and the gaps between the polarity terminals 13 of each individual battery 12 and the clearance holes are filled with the insulating sealant layer to overcome the above-mentioned problems. The insulating sealant layer is relatively thin, only needing to ensure that condensation cannot enter the gaps between the polarity terminals 13 of the individual battery 12 and the clearance holes. The thin insulating sealant layer can ensure heat exchange between the liquid cooling plate 21 and the outer casing 11. The aforementioned insulating sealant is generally a commonly used battery potting compound, such as an organosilicon thermally conductive potting compound, which has good sealing, insulation, vibration resistance, heat dissipation, and waterproof functions.

[0108] In other embodiments, the insulating sealant layer can also be made thicker. In this case, the entire liquid cooling plate 21 is covered by the insulating sealant layer, that is, the liquid cooling plate 21 is submerged in the insulating sealant layer. The space between the top plate of the outer casing 11 and the bottom of the liquid cooling plate 21, the top of the liquid cooling plate 21, and the space between the heat-conducting component and the polar terminal of the high-capacity battery are all filled with the insulating sealant layer. It should be noted that after the insulating sealant layer is laid, the end of the polar terminal of the high-capacity battery needs to extend out of the insulating sealant layer to connect with the electrical connector. The liquid inlet and outlet of the liquid cooling plate also need to extend out of the insulating sealant layer. This method of laying the insulating sealant layer allows the liquid cooling plate 21 to be fixed to the top of the outer casing 11 without the need for other methods of fixing the liquid cooling plate 21.

[0109] like Figure 20 As shown, based on the above structure, this embodiment also provides an insulating protective cover 15 on the top of the large-capacity battery 1, thereby providing insulation protection for the polar terminal 13 and the liquid cooling plate 21, avoiding potential safety hazards caused by the exposure of the polar terminal 13 during the operation of the large-capacity battery 1, and also preventing foreign objects from falling into the polar terminal 13 and causing a short circuit in the large-capacity battery 1, thus 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, so that the liquid cooling plate 21 can be reliably installed on the casing of the large-capacity battery, realizing integrated installation.

[0111] It should be noted that if the insulating protective cover 15 completely covers the polarity terminal 13, it would make electrical connection of this type of high-capacity battery 1 more difficult. Therefore, in this embodiment, a slit is opened on the side wall of the insulating protective cover 15. Through this slit, the electrical connector can be connected to the polarity terminal 13 of the high-capacity battery 1, thereby achieving electrical connection. It should also be noted that channels for the liquid inlet and outlet of the liquid cooling plate 21 to extend are also opened on the side wall of the insulating protective cover 15.

Claims

1. A liquid cooling device, characterized by, The liquid cooling device comprises at least one liquid cooling plate and a plurality of heat conductive members. The liquid cooling plate is provided with a liquid cooling channel through which a heat transfer medium passes, and an inlet and an outlet communicating 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 through the liquid cooling plate in the z direction, and the plurality of heat conductive members are embedded in the through holes one by one, and each heat conductive member is provided with a heat conductive hole through which the polarity terminal of the large-capacity battery passes, and the liquid cooling plate is insulated from the polarity terminal of the large-capacity battery.

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

3. The liquid cooling device of claim 1, wherein, The liquid cooling plate is one, and the liquid cooling plate is provided with two groups of heat conductive members arranged in sequence along the x direction.

4. The liquid cooling device of claim 3, wherein, The liquid cooling plate is provided with a partition plate, which divides the liquid cooling channel into a U-shaped liquid cooling channel, and the inlet and the outlet are arranged on the same side wall of the liquid cooling plate, and the liquid cooling channel communicating with the inlet exchanges heat with the positive polarity terminal of the large-capacity battery, and the liquid cooling channel communicating with the 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, The bottom of the liquid cooling plate is provided with an avoiding groove for avoiding the gas sharing chamber of the large-capacity battery.

6. The liquid cooling device of claim 5, wherein, The top end and the bottom end of the heat conductive member are respectively provided with circumferentially protruding annular flanges, after the heat conductive member passes through the through hole of the liquid cooling plate, the annular flange at the top end of the heat conductive member is sealingly connected with the top plate of the liquid cooling plate, and the annular flange at the bottom end of the heat conductive member is sealingly connected with the bottom plate of the liquid cooling plate.

7. A high capacity battery characterized by The liquid cooling device comprises a shell, a plurality of single batteries and the liquid cooling device of any one of claims 1 to 6; the plurality of single batteries are arranged in the shell along the same x direction; the shell is provided with a shared chamber, and the inner cavity of the shared chamber and the inner cavities of all single batteries are communicated; the top plate of the shell is provided with an avoiding hole corresponding to the polarity terminal of each single battery; the polarity terminal of each single battery extends out of the avoiding hole, and the area of the top plate of the shell corresponding to the avoiding hole is fixedly sealed with the shell of the single battery. The liquid cooling plate is arranged on the top plate of the shell, and after the polarity terminal of each single battery extends out of the avoiding hole, it passes through the heat conductive hole of the heat conductive member.

8. The battery of claim 7, wherein The top plate of the shell is provided with a blocking edge extending along the x direction on both sides, and the liquid cooling plate is embedded and installed on the inner side of the blocking edge.

9. The high capacity battery of claim 7, wherein, An insulating sealing adhesive layer is arranged between the top plate of the shell and the liquid cooling plate, and the gap between the polarity terminal of each single battery and the avoiding hole is filled with the insulating sealing adhesive layer, and the top of the shell is provided with an insulating protective cover, and the polarity terminal of each single battery and the liquid cooling plate are located in the insulating protective cover.

10. The battery of any one of claims 7 to 9, wherein the battery is a lithium-ion battery. The shared chamber comprises an electrolyte sharing chamber and a gas sharing chamber. The electrolyte sharing chamber is communicated with the electrolyte area of each single battery. The gas sharing chamber is communicated with the gas area of each single battery, or the gas sharing chamber is a gas channel between the top plate of the shell and each single battery, the gas channel covers the explosion venting membrane of each single battery, and when the explosion venting membrane of any single battery is broken by the inner cavity thermal runaway smoke, the gas area of the single battery and the gas channel are communicated.

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