Heat transfer piece and high-capacity battery

Abstract

The utility model provides a heat transfer piece and a high-capacity battery, and mainly solves the problem of insulation between the heat transfer piece and a battery polarity terminal in the existing battery temperature control system. The heat transfer piece comprises a heat transfer pipe which is a metal pipe, and an enamel insulating layer is arranged on the outer wall of the heat transfer pipe. The enamel insulating layer is arranged on the outer wall of the metal tube, so that when the high-capacity battery works, the enamel insulating layer can reliably realize insulation between the heat transfer tube and the polarity terminal of the high-capacity battery, and meanwhile, the enamel insulating layer has excellent wear resistance and insulating property, and is not easy to fall off and damage in the carrying, mounting and using processes.

Description

Technical Field

[0001] The utility model belongs to the field of battery temperature control, and specifically relates to a heat transfer element and a large-capacity battery. Background Art

[0002] Lithium-ion batteries are widely used and can be applied to energy storage, power batteries and other fields. With the further development of lithium-ion batteries in recent years, the safe use of lithium-ion batteries has also attracted attention. Due to the principle and structural characteristics of lithium-ion batteries, a large amount of heat will be generated during the charging and discharging process, and the heat will gradually increase. If the generated heat cannot be effectively released, the heat will accumulate in the battery, causing uneven battery temperature, thereby reducing the battery life. In severe cases, the thermal balance of the battery is destroyed, which in turn causes battery safety accidents.

[0003] Research has found that during the battery charging and discharging process, the temperature at the battery polarity terminal is the highest point in the battery. If the heat at the battery polarity terminal is processed, the battery can be effectively cooled, thereby achieving effective temperature control of the battery. Currently, the heat at the battery polarity terminal can be processed in the following way: a heat transfer tube is added to the battery polarity terminal, and a heat transfer medium is contained in the heat transfer tube. The heat transfer tube exchanges heat with the battery polarity terminal, and then a heat treatment device is used to process the heat transfer medium. When the above heat transfer tube exchanges heat with the battery polarity terminal, reliable insulation must be achieved. Summary of the invention

[0004] The utility model provides a heat transfer element and a large-capacity battery, which mainly solve the insulation problem between the existing heat transfer element and the battery polarity terminal.

[0005] In order to achieve the above object, the technical solution of the utility model is:

[0006] The utility model provides a heat transfer component, comprising a heat transfer tube. The heat transfer tube is a metal tube, and an enamel insulation layer is provided on the outer wall of the heat transfer tube.

[0007] Furthermore, the thickness of the enamel insulation layer is 200um to 500um.

[0008] Furthermore, the heat transfer tube includes a first tube, a second tube and a connecting tube; the first tube is used to exchange heat with the first polarity terminal of the large-capacity battery; the second tube is used to exchange heat with the second polarity terminal of the large-capacity battery; both ends of the connecting tube are respectively connected to the ports of the first tube and the second tube on the same side, and the outer walls of the first tube and the second tube have an enamel insulation layer.

[0009] Furthermore, the heat transfer tube is an aluminum tube, and the wall thickness of the aluminum tube is 0.5 mm to 1.5 mm.

[0010] Furthermore, it also includes an insulating sleeve, which is arranged on the heat transfer tube with the enamel insulation layer.

[0011] The utility model provides a large-capacity battery, comprising an outer shell and a plurality of single cells arranged in the outer shell in the same direction; a shared chamber is arranged in the outer shell, and the inner cavity of the shared chamber is communicated with the inner cavities of all the single cells; a avoidance hole is opened on the top plate of the outer shell corresponding to the polarity terminal of each single cell; each single cell polarity terminal extends out of the avoidance hole, and the top plate area of ​​the outer shell corresponding to the avoidance hole is fixedly sealed with the shell body of the single cell; a clamping part is arranged at the part where each single cell polarity terminal extends out of the avoidance hole, and a heat transfer element is fixed on the clamping part of each single cell polarity terminal, the heat transfer element is the heat transfer element described above, and the clamping part is a through groove or a through hole opened on the polarity terminal of each single cell.

[0012] Furthermore, it also includes a pressing plate, which includes a pressing part and a fixing part; the pressing part has an arc surface, which is used to cooperate with the through groove of the polarity terminal to press the heat transfer tube into the through groove; the fixing part is arranged on both sides of the pressing part, connected to the polarity terminal of each single battery, used to realize parallel connection of multiple single batteries, and at the same time used to fix the pressing part on the polarity terminal.

[0013] Furthermore, the fixing portion is provided with a connection hole for connecting with a polarity terminal screw, and the pressing plate is a copper plate with a thickness of 0.5 mm to 1 mm.

[0014] Furthermore, an insulating sealant layer is laid on the top plate of the shell, and the liquid inlet end and the liquid outlet end of the heat transfer tube extend out of the insulating sealant layer.

[0015] Furthermore, an insulating protective cover is provided on the top of the shell, and polarity terminals of each single battery are located inside the insulating protective cover.

[0016] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0017] 1. The utility model provides an enamel insulation layer on the outer wall of the metal tube of the heat transfer tube. The enamel insulation layer has excellent wear resistance and insulation performance, and is not easy to fall off or be damaged during transportation, installation and use. When the large-capacity battery is working, it can reliably achieve insulation between the heat transfer tube and the polarity terminals of the large-capacity battery, thereby improving the reliability of the large-capacity battery when working.

[0018] 2. In the heat transfer element of the present invention, the thickness of the enamel insulation layer is 100um to 300um. The enamel insulation layer of this thickness can ensure excellent insulation performance while also ensuring good thermal conductivity performance.

[0019] 3. In the heat transfer element of the utility model, the heat transfer pipe includes a spliced ​​pipe structure of a first pipe, a second pipe and a connecting pipe, and the spliced ​​pipe structure is easy to install. At the same time, the connecting pipe in the spliced ​​pipe can be an insulating pipe to further increase the insulation performance of the heat transfer pipe.

[0020] 4. In the heat transfer element of the present invention, the heat transfer tube adopts an aluminum tube with good heat transfer effect and relatively low cost. At the same time, the wall thickness of the aluminum tube is 0.5mm-1.5mm. The heat transfer tube with this wall thickness can maintain its installation reliability while having good thermal conductivity, avoiding the risk of easy bending and damage when the wall thickness of the heat transfer tube is thin.

[0021] 5. The utility model provides an insulating sleeve on the heat transfer tube with an enamel insulation layer to form a double insulation structure; this double insulation setting ensures that when the heat transfer tube and the single battery are exchanging heat, even if the enamel insulation layer is damaged, the heat transfer tube and the single battery can still maintain reliable insulation performance, thereby improving the safety of large-capacity batteries during use.

[0022] 6. In the large-capacity battery of the utility model, a clamping part is provided at the polarity terminal of each single cell, and the heat transfer tube is fixed by the clamping part, so that the heat transfer tube is in direct contact with the polarity terminal of the single cell, and the heat of the polarity terminal where the heat is most concentrated is transferred to the outside for processing. This heat dissipation method realizes balanced heat dissipation of the top of the large-capacity battery, especially the polarity terminal, and avoids performance problems and safety problems caused by excessively high or low temperature of the large-capacity battery.

[0023] 7. In the large-capacity battery of the utility model, the clamping part is a through groove or through hole opened on the polarity terminal of each single battery, and the heat transfer tube is arranged in the through groove or through hole, and directly contacts with the polarity terminal of each single battery, so that the heat transfer tube and the polarity terminal have a larger contact area, further improving the heat exchange efficiency.

[0024] 8. In the utility model of large-capacity battery, the pressure plate is connected to the polarity terminal of each single battery, which can realize reliable parallel connection between each single battery. At the same time, the pressure plate cooperates with the polarity terminal to press the heat transfer tube into the through groove of the polarity terminal, so that the heat transfer tube and the through groove of the polarity terminal are in close contact, and there is almost no heat conduction gap between the two, which improves the heat exchange effect between the heat transfer tube and the polarity terminal.

[0025] 9. In the large-capacity battery of the utility model, an insulating sealant layer is laid on the top plate of the shell. When condensation occurs on the surface of the heat transfer tube on the polarity terminal, the condensation cannot penetrate into the gap between the polarity terminal and the avoidance hole due to the blocking of the insulating sealant layer, thereby preventing the battery from short-circuiting.

[0026] 10. In the large-capacity battery of the utility model, an insulating protective cover is used to provide insulation protection for the polarity terminals, thereby avoiding the potential safety hazards of the polarity terminals being exposed during the operation of the large-capacity battery, and also avoiding the problem of some foreign objects in the external environment falling into the polarity terminal position causing a short circuit in the large-capacity battery, thereby improving the safety of the large-capacity battery.

[0027] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 The structure of the heat transfer element in Example 1 is shown in FIG. Figure 1 ;

[0030] Figure 2 The structure of the heat transfer element in Example 1 is shown in FIG. Figure 2 ;

[0031] Figure 3 is a schematic structural diagram of the heat transfer element in Example 2;

[0032] Figure 4 Schematic diagram of the structure of a large-capacity battery (polarity terminals are poles) in Example 3;

[0033] Figure 5 This is a schematic diagram of the structure of a large-capacity battery in Example 3 (the front cover of the housing is omitted);

[0034] Figure 6 This is a schematic diagram of the structure of a large-capacity battery (polarity terminals are poles and pole adapters) in Example 3;

[0035] Figure 7 An exploded view of a large-capacity battery in Example 4;

[0036] Figure 8 It is a schematic diagram of the structure of the pressing plate in Example 4;

[0037] Fig. 9 This is a schematic diagram of the structure of a large-capacity battery (with an insulating sealant layer) in Example 3;

[0038] Fig.10Schematic diagram of the structure of a large-capacity battery (with an insulating protective cover) in Example 3.

[0039] Figure numerals: 1-large capacity battery, 2-heat transfer part, 3-pressure plate, 4-electrical connector, 11-housing, 12-single battery, 13-polarity terminal, 14-insulating sealant layer, 15-insulating protective cover, 111-gas sharing chamber, 112-electrolyte sharing chamber, 113-avoidance hole, 131-clamping part, 21-heat transfer tube, 22-enamel insulation layer, 23-insulating sleeve, 211-first tube, 212-second tube, 213-connecting tube, 31-pressing part, 32-fixing part, 33-connecting hole. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work should fall within the scope of protection of the utility model.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] The "other embodiments" that appear in different places in this specification do not all refer to the same embodiment, nor are they separate or selective embodiments that are mutually exclusive with other embodiments. In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of this utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically limited.

[0043] In the description of this specification, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] At the same time, in the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top, bottom, inside and outside" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention.

[0045] During the charging and discharging process of large-capacity batteries, a large amount of heat will be generated. If the large-capacity batteries are not cooled in time, the performance of the large-capacity batteries will decline. At present, liquid cooling is mainly used to cool large-capacity batteries. When cooling large-capacity batteries by liquid cooling, heat transfer tubes are generally used to exchange heat with large-capacity batteries. The heat transfer tubes contain a heat-conducting medium. The heat transfer tubes are connected to a heat treatment device. The heat treatment device processes the heat of the heat-conducting medium in the heat transfer tubes. The heat treatment device is a device with heating and / or cooling functions, which is used to increase or decrease the temperature of the heat-conducting medium in the heat transfer tubes. For example, the heat treatment device is a heater, a cold and warm machine, or a refrigerator with a compressor, a chiller, etc.

[0046] When the heat transfer tube is installed, it is specifically set on the polarity terminal of the large-capacity battery for direct heat exchange with the polarity terminal of the large-capacity battery; to ensure the heat exchange efficiency between the heat transfer tube and the large-capacity battery, the heat transfer tube generally adopts a metal tube with good thermal conductivity, and the heat transfer medium in the heat transfer tube is a liquid medium, which can be water, ethylene glycol / water, propylene glycol / water, methanol / water, ethanol / water, calcium formate / water, etc. When the heat transfer tube contacts the polarity terminal for heat exchange, insulation needs to be set between the heat transfer tube and the polarity terminal of the large-capacity battery. If the insulation performance between the two is poor, it will cause a short circuit in the battery after it is installed on the polarity terminal of the large-capacity battery, causing a safety hazard.

[0047] Based on this, the utility model provides a heat transfer component, which is a heat transfer tube with an enamel insulation layer, which is installed on the polarity terminals of a large-capacity battery so that the polarity terminals of the large-capacity battery and the heat transfer tube have reliable insulation performance when performing heat exchange.

[0048] Example 1

[0049] like Figure 1 and Figure 2As shown, this embodiment provides a heat transfer member, and the heat transfer member 2 specifically includes a heat transfer tube 21, which is a metal tube. The heat transfer tube 21 has an enamel insulation layer 22, and the enamel insulation layer 22 is formed on the outer wall of the heat transfer tube 21. When the large-capacity battery 1 is working, the enamel insulation layer 22 can reliably achieve insulation between the heat transfer tube 21 and the polarity terminal 13 of the large-capacity battery 1. At the same time, the enamel insulation layer 22 can also ensure that the heat transfer tube 21 has good heat exchange performance after contacting the polarity terminal 13. In addition, the enamel insulation layer 22 has excellent wear resistance, and is not easy to fall off or be damaged during transportation, installation and use, which improves the safety of large-capacity batteries when in use.

[0050] The heat transfer tube 21 is a pipe with a heat exchange function, which is mainly in contact with the polarity terminal 13 of the large-capacity battery 1 and is used to perform heat exchange with the polarity terminal 13 of the large-capacity battery 1. The cross-sectional shape of the heat transfer tube 21 is not required, as long as it can be in contact with the polarity terminal 13 of the single battery 12 for heat exchange, for example, a square tube, an elliptical tube, a round tube, etc. can be used. In this embodiment, the heat transfer tube 21 is preferably a round tube, which is easy to install and can be made of existing metal tubes, and the cost is relatively low.

[0051] The heat transfer tube 21 in this embodiment specifically adopts a metal tube with good thermal conductivity, such as an aluminum tube, a copper tube, etc. Preferably, the heat transfer tube 21 adopts an aluminum tube with good thermal conductivity and relatively low cost. In order to ensure the thermal conductivity, the thinner the wall thickness of the aluminum tube, the better. However, if the wall thickness of the aluminum tube is too thin, the aluminum tube is relatively soft and is easy to bend and break during installation. Therefore, in this embodiment, the wall thickness of the aluminum tube is preferably 0.5mm to 1.5mm. The aluminum tube with this wall thickness can maintain its installation reliability while having good thermal conductivity, avoiding the risk of easy bending and damage when the wall thickness of the aluminum tube is thin. In specific use, the diameter of the aluminum tube is generally about 10mm to 20mm.

[0052] The heat transfer tube 21 can be manufactured in the following manner:

[0053] First, the heat transfer tube 21 can be made of a whole tube, and the whole aluminum tube is bent into a U-shaped tube, and the two straight tubes of the U-shaped tube are respectively fixed to the first polarity terminal and the second polarity terminal of each single battery 12 in the large-capacity battery 1;

[0054] Second, if Figure 1 and Figure 2As shown, the heat transfer pipe 21 is a spliced ​​pipe, mainly including an L-shaped first pipe section and a second pipe section; the first pipe section is fixed to the first polarity terminal of each single battery 12 in the large-capacity battery 1; the second pipe section is fixed to the second polarity terminal of each single battery 12 in the large-capacity battery 1, and the relatively short pipe sections of the first pipe 211 and the second pipe 212 are connected by a joint;

[0055] Third, if Figure 4 As shown, for the convenience of installation, the heat transfer pipe 21 is a spliced ​​pipe, mainly including a first pipe 211, a second pipe 212 and a connecting pipe 213; the first pipe 211 is fixed to the first polarity terminal of each single cell 12 in the large-capacity battery 1; the second pipe 212 is fixed to the second polarity terminal of each single cell 12 in the large-capacity battery 1, and the two ends of the connecting pipe 213 are respectively connected to the ports of the first pipe 211 and the second pipe 212 on the same side. At the same time, the connecting pipe 213 in this spliced ​​pipe can be an insulating pipe to further increase the insulation performance of the heat transfer pipe.

[0056] The side wall of the heat transfer tube 21 in contact with the polarity terminal 13 of the large-capacity battery 1 is provided with an enamel insulation layer 22. When the aluminum tube is provided with the enamel insulation layer 22, the enamel insulation layer 22 is formed on the outer tube wall of the aluminum tube and is an integral structure with the aluminum tube. When the enamel insulation layer 22 is formed on the heat transfer tube 21, the inorganic glass material can be condensed on the outer wall of the metal tube through a high-temperature melting technology, and is firmly combined with the outer wall of the metal tube. After the enamel insulation layer 22 is formed on the outer wall of the metal tube, the heat transfer tube 21 has outstanding excellent properties such as high hardness, high temperature resistance, wear resistance and insulation effect.

[0057] The thicker the enamel insulation layer 22 is, the better the insulation performance is, but its thermal conductivity will be reduced. In this embodiment, the thickness of the enamel insulation layer 22 is preferably 100um to 300um. The enamel insulation layer 22 of this thickness ensures the insulation performance while also making the side wall of the aluminum tube have better thermal conductivity. At the same time, the enamel insulation layer 22 is not easy to fall off and has better wear resistance.

[0058] When the enamel insulation layer 22 is provided on the heat transfer tube 21, the enamel insulation layer 22 may be provided only on the side wall of the heat transfer tube 21 that contacts the polarity terminals 13 of the single battery 12. Figure 2 As shown. It is also possible to set an enamel insulation layer 22 on the entire heat transfer tube 21, such as Figure 1As shown. When the enamel insulation layer 22 is provided on part of the side wall of the heat transfer tube 21, the processing and forming process of the enamel insulation layer 22 is relatively complicated. In addition, when the heat transfer tube 21 formed in this way cooperates with the polarity terminal 13 of the single battery 12, it is also necessary to pay attention to its installation position to avoid connecting the heat transfer tube 21 without the enamel insulation layer 22 to the polarity terminal 13 of the single battery 12, thereby preventing the risk of short circuit. Therefore, relatively speaking, it is a relatively better way to provide the enamel insulation layer 22 on the outer wall of the entire heat transfer tube 21. This setting method not only makes the molding of the enamel insulation layer 22 simpler, but also, when the heat transfer tube 21 of this structure is installed with the polarity terminal 13 of the single battery 12, there is no need to consider the installation error between the enamel insulation layer 22 and the polarity terminal 13 of the single battery 12, and the on-site installation of the heat transfer tube 21 is more convenient.

[0059] Example 2

[0060] like Figure 3 As shown, in this embodiment, in order to ensure the reliability of insulation, an insulating sleeve 23 is provided on the outer side of the heat transfer tube 21 having the enamel insulation layer 22 in Embodiment 1, so as to form double insulation on the outer wall of the heat transfer tube 21. This double insulation arrangement enables the heat transfer tube 21 to maintain reliable insulation performance with the large-capacity battery 1 even if the enamel insulation layer 22 is damaged during heat exchange between the heat transfer tube 21 and the large-capacity battery 1, thereby improving the safety of the large-capacity battery 1 during use.

[0061] The insulating sleeve 23 can be made of insulating materials with good thermal conductivity, so that it has good thermal conductivity and good insulation performance. In this embodiment, the insulating sleeve 23 is made of a thermally conductive plastic sleeve or a thermally conductive rubber sleeve with good insulation and thermal conductivity, such as a thermally conductive silicone sleeve. Theoretically, the thinner the thickness of the insulating sleeve 23, the better the thermal conductivity. However, while ensuring its thermal conductivity, its insulation performance must also be ensured. The insulation performance requires that the thicker the insulating sleeve 23, the more reliable the insulation performance. After balancing the thermal conductivity and insulation performance, the thickness of the insulating sleeve 23 in this embodiment is preferably 0.5mm to 1.5mm, and the best is preferably 1mm; this thickness can ensure good thermal conductivity while ensuring excellent insulation performance. The cross-sectional shape of the insulating sleeve 23 can be circular, U-shaped, or C-shaped, as long as it can be mounted on the heat transfer tube 21 with the enamel insulation layer 22 to achieve insulation at the contact between the heat transfer tube 21 and the polarity terminal 13 of the single battery 12. Meanwhile, the cross-sectional shape of the insulating sleeve 23 is preferably the same as that of the heat transfer tube 21 , so that the insulating sleeve 23 can be tightly nested on the heat transfer tube 21 to improve the thermal conductivity of the heat transfer tube 21 .

[0062] When the insulating sleeve 23 is installed and matched with the heat transfer tube 21, the size of the insulating sleeve 23 is set slightly smaller than the size of the heat transfer tube 21, so that the insulating sleeve 23 is tightly nested on the heat transfer tube 21 with the enamel insulation layer, or the insulating sleeve 23 can also be put on the heat transfer tube 21 with the enamel insulation layer by heat shrinking. In this embodiment, the preferred method is: the insulating sleeve 23 is put on the heat transfer tube 21 with the enamel insulation layer by heat shrinking. For example, a polytetrafluoroethylene sleeve, a silicone sleeve, etc. can be heat-shrunk on the aluminum tube with the enamel insulation layer 22 to form a polytetrafluoroethylene heat-shrinkable aluminum tube or a silicone heat-shrinkable aluminum tube. This installation method can make it possible to have almost no heat transfer gap between the insulating sleeve 23 and the heat transfer tube 21, and the heat conduction effect of the insulating sleeve 23 is better.

[0063] Example 3

[0064] like Figures 4 to 6 As shown, this embodiment provides a large-capacity battery, which includes a shell 11 and a plurality of single cells 12 arranged in the same direction and placed in the shell 11. The single cells 12 in this embodiment are square shell batteries, and the number can be adjusted according to actual needs. The inner cavity of each single cell 12 includes an electrolyte area and a gas area. After the multiple single cells 12 are arranged in the same direction and placed in the shell 11, a avoidance hole 113 is opened on the top plate of the shell 11 corresponding to the polarity terminal 13 of each single cell 12, and the polarity terminal 13 of each single cell 12 extends out of the corresponding avoidance hole 113 as the polarity terminal 13 of the large-capacity battery 1 (the polarity terminal 13 of all single cells 12 on one side is used as the first polarity terminal of the large-capacity battery 1, and the polarity terminal 13 of all single cells 12 on the other side is used as the second polarity terminal of the large-capacity battery 1), and the top plate area of ​​the shell 11 corresponding to the avoidance hole 113 is fixedly sealed with the shell of the single cell 12. The above-mentioned shell 11 is provided with a shared chamber, and the inner cavity of the shared chamber is connected to the inner cavity of all single cells 12.

[0065] It should be noted that if Figure 4 and Figure 5 As shown, the polarity terminal 13 of the single battery 12 here can be the pole of the single battery 12. In order to prevent the pole of the single battery 12 from being able to smoothly extend out of the avoidance hole 113 as the polarity terminal 13, a pole adapter can be connected to the pole of the single battery 12, and the overall structure of the pole of the single battery 12 and the pole adapter can be used as the polarity terminal 13 of the single battery 12, such as Figure 6 shown.

[0066] The above-mentioned shared chamber may be an electrolyte shared chamber 112, the inner cavity of the electrolyte shared chamber 112 is connected to the electrolyte area of ​​the inner cavity of all the single cells 12, and the electrolyte shared chamber 112 can make each single cell 12 in a unified electrolyte environment, thereby 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. In this embodiment, the electrolyte shared chamber 112 is a liquid channel arranged between the bottom plate of the housing 11 and the bottom of each single cell 12.

[0067] The above-mentioned shared chamber can also be a gas shared chamber 111. The inner cavity of the gas shared chamber 111 is connected to the gas area of ​​the inner cavity of all the single cells 12. The gas balance of each single cell 12 is achieved through the gas shared chamber 111, which can also improve the performance and charge-discharge cycle life of the large-capacity battery 1. In this embodiment, the gas shared chamber 111 is a gas channel arranged on the top plate of the shell 11. At this time, the top plate of the shell 11 is provided with a protrusion extending along the arrangement direction of the single cells 12, and a gas channel is formed at the protrusion.

[0068] The above-mentioned shared chamber can also be a gas-liquid shared chamber, and the inner cavity of the gas-liquid shared chamber is connected to the electrolyte area and gas area of ​​the inner cavity of all single cells 12. Through a gas-liquid shared chamber, each single cell 12 can be placed in a unified electrolyte environment and gas environment, thereby improving the performance and charge and discharge cycle life of the large-capacity battery 1.

[0069] A clamping part 131 is provided on each polarity terminal 13, and the heat transfer tube 21 in Example 1 or Example 2 is fixed in the clamping part 131, so that the heat transfer tube 21 is directly connected to the polarity terminal 13 of the large-capacity battery 1, and the heat on the polarity terminal 13 where the heat is relatively concentrated is promptly discharged, thereby improving the heat dissipation effect on the top of the large-capacity battery 1. In addition, when the temperature of the large-capacity battery 1 is lower than the set threshold, a heat-conducting medium with a higher temperature is introduced into the heat transfer tube 21 to increase the temperature of the large-capacity battery 1; by controlling the temperature of the heat-conducting medium, it can be ensured that the large-capacity battery 1 always operates at a normal operating temperature.

[0070] like Figure 5 As shown, when the heat transfer tube 21 is installed, a through groove or through hole is provided at the position where the polarity terminal 13 of the single battery 12 extends out of the avoidance hole 113, as a clamping portion 131; compared with the through hole, the through groove is more convenient for on-site installation, and the installation requirements are relatively low. The through groove is arranged in a C-shaped cross section, and the opening width of the C-shaped through groove is smaller than the widest part of the through groove. Such a design is conducive to the interference fit of the heat transfer tube 21 in the through groove. The arc formed at both ends of the C-shaped through groove has natural tension, which is conducive to the heat transfer tube 21 being tightly clamped in the through groove.

[0071] In this embodiment, the polarity terminal 13 of the single battery 12 is a cylinder. In this case, the through groove can be set on the side wall or end face of the cylinder. The through groove or through hole is opened on the side wall. Compared with the through groove opened on the end face, the contact area between the heat transfer tube 21 in the through groove or through hole and the inner wall of the through groove or through hole is larger, and the heat exchange efficiency is higher. In addition, when the through groove or through hole is located on the side wall, the entire area of ​​the end face can be used as an electrical connection area. In addition, two through grooves or through holes can be set on the side wall of the pole at the same time to increase the number of heat transfer tubes 21 placed and further improve the heat exchange efficiency. The above-mentioned heat transfer tube 21 is fixed in the through groove or through hole of the polarity terminal 13 of the large-capacity battery 1 to process the heat on the top of the large-capacity battery 1. The large-capacity battery 1 can work safely and reliably, avoiding performance problems and safety problems caused by excessively high or low temperatures of the large-capacity battery 1.

[0072] Example 4

[0073] like Figure 7 As shown, based on the structure of the large-capacity battery 1 of embodiment 2 or embodiment 3, this embodiment adds a pressing plate 3 on the polarity terminal 13 of the large-capacity battery 1, and the pressing plate 3 is connected to the polarity terminal 13 of each single battery 12 to realize reliable parallel connection of multiple single batteries 12. At the same time, the pressing plate 3 cooperates with the polarity terminal 13 to tightly and reliably install the heat transfer tube 21 into the through groove of the polarity terminal 13, thereby improving the heat exchange effect between the heat transfer tube 21 and the polarity terminal 13. At the same time, the pressing plate 3 is arranged above the heat transfer tube 21 to protect the heat transfer tube 21 and the polarity terminal 13, thereby improving the safety of the single battery 12 during use.

[0074] like Figure 8 As shown, the pressing plate 3 specifically includes a pressing portion 31 and a fixing portion 32; the bottom of the pressing portion 31 has an arc surface, which is used to cooperate with the through groove on the polarity terminal 13 to press the heat transfer tube 21 into the through groove; the fixing portion 32 is arranged on both sides of the pressing portion 31 to fix the pressing plate 3 on the top of the polarity terminal 13.

[0075] The length of the above-mentioned pressing plate 3 can be determined according to the number of single cells 12, and its length is equivalent to the length of the polarity terminals 13 of all single cells 12 in the large-capacity battery 1 in the arrangement direction. After the pressing plate 3 is connected to the polarity terminals 13 of each single cell 12, it has the following two functions: First, it is connected to the polarity terminals 13 of multiple single cells 12 to achieve reliable parallel connection between each single cell 12. Since the pressing plate 3 only needs to be connected to the polarity terminals 13 of each single cell 12 in the same large-capacity battery 1, the parallel connection between each single cell 12 can be achieved. During on-site installation, adjacent large-capacity batteries 1 or battery groups are connected through separately set electrical connectors. Therefore, the pressing plate 3 does not need to consider the installation error between adjacent large-capacity batteries 1, and the installation requirements are relatively low; Second, the pressing plate 3 tightly presses the heat transfer tube 21 in the through groove of the polarity terminal 13, so that the heat transfer tube 21 can be closely contacted with the through groove of the polarity terminal 13, and there is almost no heat conduction gap between the two, which increases the heat exchange effect between the heat transfer tube 21 and the polarity terminal 13.

[0076] In this embodiment, the bottom of the pressing part 31 has an arc surface, and the cross-sectional shape of the arc surface after matching with the through groove is similar to the cross-sectional shape of the heat transfer tube 21, so that the heat transfer tube 21 is tightly attached to the through groove of the polarity terminal 13. The heat transfer tube 21 is generally a metal round tube, so the cavity formed by the pressing part 31 and the through groove is generally a circular cavity. At the same time, since the heat transfer tube 21 and the polarity terminal 13 cooperate to perform heat exchange, most of the side wall of the heat transfer tube 21 needs to be embedded in the through groove. At this time, the central angle corresponding to the arc surface of the pressing part 31 is generally between 90° and 180°, which is the best. This setting allows most of the side wall of the heat transfer tube 21 to be embedded in the through groove of the polarity terminal 13, increasing the contact area between the heat transfer tube 21 and the polarity terminal 13, and further increasing the heat exchange effect between the heat transfer tube 21 and the polarity terminal 13. If the central angle of the arc surface of the clamping portion 31 is greater than 180°, the contact area between the heat transfer tube 21 and the through groove of the polarity terminal 13 is small, resulting in poor heat transfer effect. If the central angle of the arc surface of the clamping portion 31 is less than 90 degrees, the contact area between the pressure plate 3 and the heat transfer tube 21 is small, resulting in the pressure plate 3 being unable to reliably apply force to the heat transfer tube 21 and insufficient clamping force.

[0077] In addition, the distance between the arc vertex of the above-mentioned pressing part 31 and the polarity terminal 13 is less than or equal to the maximum dimension of the heat transfer tube 21 protruding from the polarity terminal 13. Since the above-mentioned heat transfer tube 21 is generally a round tube, the arc surface of the pressing part 31 is a circular arc surface. At this time, the arc radius of the pressing part 31 is preferably less than or equal to the radius of the heat transfer tube 21. After the pressing plate 3 is connected to the polarity terminal 13, the pressing part 31 can exert a downward force on the heat transfer tube 21, so that there is almost no heat transfer gap between the heat transfer tube 21 and the polarity terminal 13. The heat transfer tube 21 is pressed and tightly fitted in the through groove, and the heat conduction effect between the heat transfer tube 21 and the polarity terminal 13 is better, thereby improving the heat transfer efficiency.

[0078] The pressing plate 3 in this embodiment is generally made of conductive metal materials, such as silver, copper, aluminum and the like. In this embodiment, the pressing plate 3 is made of copper plate, which not only has good conductivity but also good ductility, and can tightly press the heat transfer tube 21 into the through groove at the polar end.

[0079] The pressing part 31 in this embodiment is an arc-shaped plate with equal wall thickness, and the fixing part 32 is a flat plate, and the arc-shaped plate and the flat plates on both sides are an integrated structure. This structure is easy to manufacture and process, and is also easy to install. When making it specifically, the pressing plate 3 can be formed by stamping a thin plate, or it can be formed in one step by extrusion. In addition, the thickness of the pressing plate 3 is generally 0.5mm to 1mm, which can ensure the installation strength while also reliably installing the heat transfer tube 21.

[0080] The fixing portion 32 in this embodiment is provided with a connecting hole 33 connected to the polarity terminal 13, so that the pressing plate 3 is connected to the polarity terminal 13 by screws. The screw connection method is easier to connect than other welding, riveting or bonding methods, and the structure is simpler. More preferably, the screw hole in this embodiment can be set to a long strip shape. The setting of the long strip hole can make up for the size error when multiple single batteries 12 are connected in parallel, thereby ensuring the reliability of the connection.

[0081] In the above-mentioned large-capacity battery 1, after each single battery 12 is installed in the housing 11, the polarity terminal 13 of each single battery 12 extends out of the avoidance hole 113, and then the heat transfer tube 21 is installed on the polarity terminal 13 of each single battery 12, and the heat transfer tube 21 is embedded in the through groove of the polarity terminal 13 of each single battery 12. Finally, the pressing plate 3 is connected to the polarity terminal 13 of each single battery 12, and the pressing plate 3 and the polarity terminal 13 are fixed by screws to realize the parallel connection between each single battery 12. After the above-mentioned pressing plate 3 is installed, the heat transfer tube 21 can also be pressed tightly in the through groove of the polarity terminal 13. The heat transfer tube 21 is used to transfer the heat generated by each single battery 12 and control the temperature of the large-capacity battery 1. In addition, an insulating pad can be set between the above-mentioned pressing plate 3 and the heat transfer tube 21 to further ensure the insulation between the metal tube and the pressing plate 3.

[0082] Example 5

[0083] During long-term use of the large-capacity battery 1, condensation will be generated on the surface due to the temperature difference between the inside and outside of the heat transfer tube 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 113, 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.

[0084] like Fig. 9 and Fig.10 As shown, this embodiment overcomes the above problems by optimizing the top structure of the large-capacity battery 1 and laying an insulating sealant layer 14 on the top plate of the shell 11. The end faces of the polarity terminals 13 of each single battery 12 extend out of the insulating sealant layer 14 to be connected to the pressing plate 3 or the electrical connector 4; the liquid inlet and outlet ends of the heat transfer tube 21 extend out of the insulating sealant layer 14 to be connected to the liquid inlet manifold and the liquid return manifold. The pressing plate 3 is a connecting device for connecting each single battery 12 in parallel, and the electrical connector 4 is a connecting device for connecting two large-capacity batteries 1 in series, and can also be a connecting device for connecting the large-capacity battery 1 to an external load.

[0085] like Fig. 9 and Fig.10 As shown, in this embodiment, an insulating sealant layer 14 is laid on the top plate of the shell 11, and a part of the polarity terminal 13 of each single battery 12 is covered by the insulating sealant layer 14, and the end surface of the polarity terminal 13 of each single battery 12 extends out of the insulating sealant layer 14 and is connected to the pressing plate 3 and / or the electrical connector 4; the main parts of the heat transfer tube 21 are all covered by the insulating sealant layer 14, and the liquid inlet end and the liquid outlet end of the heat transfer tube 21 extend out of the insulating sealant layer 14, which is used to be connected to the liquid inlet manifold and the liquid return manifold.

[0086] In some other embodiments, the thickness of the insulating sealant layer 14 can be smaller, lower than the main part of the heat transfer tube 21, or cover a part of the main part of the heat transfer tube 21, as long as condensation cannot enter the gap between the polarity terminal 13 of the single battery 12 and the avoidance hole 113.

[0087] The insulating sealant used in this embodiment is generally a battery potting glue commonly used in batteries, such as a silicone thermal conductive potting glue, which has good sealing, insulation, vibration resistance, heat dissipation and waterproof functions. In order to prevent the insulating sealant from overflowing, during the injection process of this embodiment, a glue injection mold can be added around the edges of the top plate of the shell 11 to ensure that the insulating sealant can be smoothly injected. After the injection is completed, demoulding is performed.

[0088] like Fig.10 As shown, on the basis of the above structure, this embodiment further provides an insulating protective cover 15 on the top of the large-capacity battery 1, thereby providing insulating protection for the polarity terminal 13, avoiding the potential safety hazard of the polarity terminal 13 being exposed during the operation of the large-capacity battery 1, and also avoiding the problem of some foreign matter in the external environment falling into the position of the polarity terminal 13 and causing the large-capacity battery 1 to short-circuit, thereby improving the safety of the large-capacity battery 1.

[0089] It should be noted that if the insulating protective cover 15 completely covers the polarity terminal 13, it will make the electrical connection of such a large-capacity battery 1 difficult. Therefore, in this embodiment, a slit is provided on the side wall of the insulating protective cover 15, through which the electrical connector 4 can be connected to the polarity terminal 13 of the single battery 12, thereby achieving electrical connection. It should also be noted that a channel for the liquid inlet and liquid outlet of the heat transfer tube 21 to extend out needs to be provided on the side wall of the insulating protective cover 15.

Claims

1. A heat transfer element, characterized in that: The invention comprises a heat transfer tube, which is a metal tube and has an enamel insulation layer on the outer wall thereof.

2. The heat transfer element according to claim 1, characterized in that: The thickness of the enamel insulation layer is 100um to 300um.

3. The heat transfer element according to claim 1, characterized in that: The heat transfer tube includes a first tube, a second tube and a connecting tube; the first tube is used to exchange heat with a first polarity terminal of a large-capacity battery; the second tube is used to exchange heat with a second polarity terminal of a large-capacity battery; both ends of the connecting tube are respectively connected to ports of the first tube and the second tube located on the same side, and the outer side walls of the first tube and the second tube have an enamel insulation layer.

4. The heat transfer element according to claim 1, characterized in that: The heat transfer tube is an aluminum tube, and the wall thickness of the aluminum tube is 0.5 mm to 1.5 mm.

5. The heat transfer element according to any one of claims 1 to 4, characterized in that: The utility model also comprises an insulating sleeve, which is arranged on the heat transfer tube with the enamel insulation layer.

6. A large capacity battery, characterized in that: It comprises an outer shell and a plurality of single cells arranged in the outer shell in the same direction; a shared chamber is arranged in the outer shell, and the inner cavity of the shared chamber is connected with the inner cavity of all the single cells; a avoidance hole is opened on the top plate of the outer shell corresponding to the polarity terminal of each single cell; each single cell polarity terminal extends out of the avoidance hole, and the top plate area of ​​the outer shell corresponding to the avoidance hole is fixedly sealed with the shell of the single cell; a clamping part is arranged at the part where each single cell polarity terminal extends out of the avoidance hole, and a heat transfer element is fixed on the clamping part of each single cell polarity terminal, and the heat transfer element is the heat transfer element according to any one of claims 1 to 5, and the clamping part is a through groove or a through hole opened on the polarity terminal of each single cell.

7. The large-capacity battery according to claim 6, characterized in that: It also includes a pressing plate, which includes a pressing part and a fixing part; the pressing part has an arc surface, which is used to cooperate with the through groove of the polarity terminal to press the heat transfer tube into the through groove; the fixing part is arranged on both sides of the pressing part, connected with the polarity terminal of each single battery, used to realize parallel connection of multiple single batteries, and at the same time used to fix the pressing part on the polarity terminal.

8. The large-capacity battery according to claim 7, characterized in that: The fixing part is provided with a connection hole for connecting with a polarity terminal screw, and the pressing plate is a copper plate with a thickness of 0.5 mm to 1 mm.

9. The large-capacity battery according to claim 8, characterized in that: An insulating sealant layer is laid on the top plate of the shell, and the liquid inlet end and the liquid outlet end of the heat transfer tube extend out of the insulating sealant layer.

10. The large-capacity battery according to claim 9, characterized in that: An insulating protective cover is arranged on the top of the shell, and polarity terminals of each single battery are located inside the insulating protective cover.

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