Heat transfer tube assembly and high-capacity battery

Abstract

The utility model belongs to the field of batteries, and particularly relates to a heat transfer tube assembly and a high-capacity battery. The heat transfer pipe assembly is a split part and comprises a first pipe, a second pipe and a connecting pipe. The first pipe is used for being fixed in a heat transfer pipe clamping part of a positive terminal of each single battery in the high-capacity battery; the second pipe is used for being fixed in a heat transfer pipe clamping part of a negative terminal of each single battery in the high-capacity battery; the two ends of the connecting pipe are connected with the ports, located on the same side, of the first pipe and the second pipe respectively. And the heat transfer tube assembly is in direct contact with the polar terminal of each single battery, so that the balanced heat dissipation of each single battery in the high-capacity battery is realized.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to a heat transfer tube assembly and a large-capacity battery. Background Art

[0002] At present, in the market, multiple single cells are connected in parallel or in series to form a large-capacity battery (which can also be called a battery module or a battery pack).

[0003] However, there are differences among the single cells in the existing large-capacity batteries. Due to the existence of the cask effect, the entire large-capacity battery is often affected by the single cell with the worst performance, resulting in a great limitation on the capacity upper limit and the cycle life of the large-capacity battery. Therefore, how to improve the uniformity of the single cells in the large-capacity battery has become the focus and difficulty in the research of this field.

[0004] To solve the above problems, Chinese Patent CN220324596U discloses a large-capacity battery, and its structure is as Figure 1 shown. Such a large-capacity battery includes a housing and multiple single cells 2. The multiple single cells 2 are connected in parallel in sequence and arranged in the inner cavity of the housing; an electrolyte sharing chamber 3 is provided on the bottom plate 14 of the housing, and the electrolyte sharing chamber 3 is communicated with the electrolyte regions in the inner cavities of the respective single cells 2; avoidance holes 6 through which the pole columns of the respective single cells 2 can extend are formed on the top plate 13 of the housing; the pole columns of the respective single cells 2 extend out of the avoidance holes 6, and the area of the housing corresponding to the avoidance holes 6 is fixedly sealed with the housing of the single cell 2. The electrolytes in the inner cavities of the respective single cells 2 are communicated through the electrolyte sharing chamber 3, so that the electrolytes of all the single cells 2 are in the same system, reducing the differences between the electrolytes of the respective single cells 2, improving the consistency among the respective single cells 2 to a certain extent, and thus improving the cycle life of the large-capacity battery to a certain extent.

[0005] During the use of the above large-capacity battery, heat is generated. If the heat dissipation is not timely, it will cause a significant shortening of the battery life, an increase in energy loss, and even potential safety hazards such as spontaneous combustion and fire. Therefore, it is particularly important to improve the heat dissipation efficiency of the above large-capacity battery. Summary of the Invention

[0006] To overcome the technical problem of poor heat dissipation performance of the existing large-capacity batteries, a first aspect of the utility model provides a heat transfer tube assembly.

[0007] The heat transfer tube assembly is a split part, including a first tube, a second tube, and a connecting tube;

[0008] The first tube is used to be fixed in the heat transfer tube clamping part of the positive terminal of each single cell in the large-capacity battery; the second tube is used to be fixed in the heat transfer tube clamping part of the negative terminal of each single cell in the large-capacity battery;

[0009] Both ends of the connecting pipe are connected to the ports on the same side of the first pipe and the second pipe respectively.

[0010] Furthermore, in order to ensure the insulation between the heat transfer pipe assembly and the large-capacity battery, the present utility model adopts the following three solutions:

[0011] Solution 1: The first pipe and the second pipe are aluminum pipes, and the pipe walls of the aluminum pipes are provided with oxide layers;

[0012] Solution 2: The first pipe and the second pipe are aluminum pipes, the pipe walls of the aluminum pipes are provided with oxide layers, and insulating sleeves are sleeved on the aluminum pipes with oxide layers.

[0013] In the above two solutions, compared with Solution 2, Solution 1 has stronger heat conduction performance because only the oxide layer is used for insulation. Compared with Solution 1, Solution 2 has stronger insulation performance because Solution 2 uses the oxide layer and insulating sleeves for insulation.

[0014] Furthermore, in order to ensure good insulation between the first pipe and the second pipe, and at the same time enable the connecting pipe to be quickly and reliably connected to the first pipe and the second pipe, the connecting pipe in the present utility model is a flexible insulating pipe, and the flexible insulating pipe, the first pipe and the second pipe are all connected by clamps.

[0015] The second aspect of the present utility model provides the following two structures of large-capacity batteries:

[0016] The first type of large-capacity battery includes a plurality of parallel-connected single cells. The improvement is that it further includes a first shared pipeline assembly and the aforementioned heat transfer pipe assembly; the first shared pipeline assembly is connected to the lower covers of each single cell and communicates with the electrolyte area in the inner cavity of the single cell; the heat exchange medium flowing in the heat transfer pipe assembly is water or fluorinated liquid.

[0017] Furthermore, the second type of large-capacity battery further includes a second shared pipeline assembly; the second shared pipeline assembly is connected to the upper covers of each single cell and communicates with the gas area in the inner cavity of the single cell.

[0018] The second type of large-capacity battery includes a housing, a plurality of parallel-connected single cells, and the aforementioned heat transfer pipe assembly;

[0019] The plurality of single cells are arranged in the housing in the same direction;

[0020] The housing is provided with a shared chamber, and the inner cavity of the shared chamber communicates with the inner cavities of all single cells;

[0021] Avoidance holes are provided on the top plate of the housing corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the area of the top plate of the housing corresponding to the avoidance holes is fixedly sealed with the single cell housing;

[0022] A heat transfer tube clamping portion is provided at the part where the polar terminals of each single battery protrude from the avoidance holes;

[0023] The heat transfer tube assembly is fixed on the heat transfer tube clamping portions of the polar terminals of each single battery, and the heat transfer tube assembly is insulated from each single battery.

[0024] Further, the second large-capacity battery further includes a second channel provided at the top of the cylinder body, and the second channel communicates with the gas regions in the inner cavities of the single batteries.

[0025] Further, the second large-capacity battery further includes a second channel provided at the top of the cylinder body, and the second channel covers the explosion relief portions on the tops of the single batteries.

[0026] The beneficial effects of the present utility model are as follows:

[0027] 1. The present utility model uses a first tube, a second tube and a connecting tube to form a heat transfer tube assembly. The heat transfer tube assembly is in direct contact with the polar terminals of each single battery, thereby timely conducting the heat of the polar terminals of the single battery, realizing the balanced heat dissipation of each single battery in the large-capacity battery, improving the use safety of the large-capacity battery, and the heat transfer tube assembly is a split part, which is convenient for assembly and processing.

[0028] 2. The present utility model uses aluminum as the main material of the heat transfer tube assembly, which has a high heat transfer efficiency; and since the aluminum tube is insulated by an oxidation method, the insulation between the heat transfer tube assembly and the polar terminals of the single battery is realized. Therefore, water can be used as the heat transfer medium to realize primary heat transfer;

[0029] Further, an oxide layer and an insulating sleeve are simultaneously provided on the aluminum tube to form a double-insulation structure; this double-insulation setting enables the heat transfer tube assembly to maintain reliable insulation performance with the single battery even if one of the insulation layers or insulating sleeves is damaged during the heat exchange between the heat transfer tube assembly and the single battery, thereby improving the safety of the single battery during use.

[0030] 3. The connecting tube of the present utility model uses a flexible insulating tube, and the flexible insulating tube is connected to the first tube and the second tube through a clamp. The use of the flexible insulating tube can realize the insulation between the first tube and the second tube, and the connection through the clamp can further improve the convenience of assembling the heat transfer tube assembly. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the explosion structure of the large-capacity battery in the background art;

[0032] Figure 2 It is a schematic diagram of the heat transfer tube assembly Figure 1 ;

[0033] Figure 3Schematic diagram of the heat transfer tube assembly Figure 2 ;

[0034] Figure 4 Schematic structural diagrams of the first and second large-capacity batteries in the present utility model;

[0035] Figure 5 Schematic structural diagram of the third large-capacity battery in the present utility model;

[0036] Figure 6 Partial structural diagram of the third large-capacity battery in the present utility model after removing one side end plate and the heat transfer tube assembly;

[0037] Figure 7 Schematic structural diagram of the cylinder body of the third large-capacity battery in the present utility model;

[0038] Figure 8 Schematic structural diagram of the bottom support member arranged inside the cylinder body of the third large-capacity battery in the present utility model;

[0039] Figure 9 Schematic structural diagram of the bottom support member in the present utility model;

[0040] Figure 10 Schematic diagram of the structure of the single battery in the present utility model Figure 1 ;

[0041] Figure 11 Schematic diagram of the structure of the single battery in the present utility model Figure 2 ;

[0042] Figure 12 Schematic structural diagram of another electrolyte sharing chamber in the present utility model;

[0043] Figure 13 Schematic diagram of the structure of the single battery in the present utility model Figure 1 ;

[0044] Figure 14 Schematic diagram of the structure of the single battery in the present utility model Figure 2 ;

[0045] Figure 15 Schematic partial explosion structure diagram of the large-capacity battery in the present utility model;

[0046] Figure 16 Partial explosion diagram of the large-capacity battery with an insulating sealing adhesive layer laid on the top plate of the outer shell in the present utility model;

[0047] Figure 17 Schematic structural diagram of the large-capacity battery with an insulating sealing adhesive layer laid on the top plate of the outer shell in the present utility model;

[0048] Figure 18Schematic diagram of the large-capacity battery structure with an insulating protective cover for the present utility model;

[0049] Figure 19 Partial explosion diagram of the large-capacity battery with an insulating protective cover for the present utility model.

[0050] The reference numerals in the figure are as follows:

[0051] 1. Outer shell; 11. Cylinder body; 12. End plate; 13. Outer shell top plate; 14. Outer shell bottom plate; 2. Single cell; 3. Electrolyte sharing chamber; 4. Gas sharing chamber; 5. Polarity terminal; 52. Second end face; 53. Side wall; 6. Avoidance hole; 7. Heat transfer tube clamping part; 8. Heat transfer tube assembly; 81. First tube; 82. Second tube; 83. Connecting tube; 84. Quick connector; 85. Clamp; 9. Bottom support; 91. First support rib; 911. Notch; 92. Second support rib; 10. Sealing assembly; 15. Insulating protective cover; 151. Insulating frame; 152. Insulating cover plate; 153. Slit; 16. Lower cover plate of single cell; 161. First through hole; 17. Upper cover plate of single cell; 171. Second through hole; 18. Baffle; 19. Channel; 20. Insulating sealant layer; 21. First electrical connector; 22. Second electrical connector; 23. First shared pipeline assembly; 24. Second shared pipeline assembly. Detailed implementation manners

[0052] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manners of the present utility model will be given in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0053] In the following description, many specific details are set forth to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0054] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "top, bottom" etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, terms such as "first, second, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In the first aspect of the present utility model, a heat transfer tube assembly is provided, which is used for heat exchange with each single battery in a large-capacity battery. The heat transfer tube assembly 8 is integrally U-shaped and is a split part. As Figure 2 shown, it includes a first tube 81, a second tube 82, and a connecting tube 83. The first tube 81 is used to be fixed in the heat transfer tube clamping part of the positive terminal of each single battery. The second tube 82 is used to be fixed in the heat transfer tube clamping part 7 of the negative terminal of each single battery 2. Both ends of the connecting tube 83 are connected to the ports on the same side of the first tube 81 and the second tube 82 respectively.

[0056] When the temperature of the large-capacity battery is higher than the set threshold, the large-capacity battery is cooled by passing a heat transfer medium with a lower temperature into the heat transfer tube assembly. When the temperature of the large-capacity battery is lower than the set threshold, the large-capacity battery is heated by passing a heat transfer medium with a higher temperature into the heat transfer tube assembly. By controlling the temperature of the heat transfer medium, it can be ensured that the large-capacity battery always operates at a normal working temperature.

[0057] In the present utility model, the heat transfer tube assembly is of a split structure. Compared with a heat transfer tube assembly formed integrally, it is easier to process. And since the heat transfer tube assembly needs to be connected to the positive and negative terminals of the single battery, using a split heat transfer tube assembly is easier to ensure the insulation performance of the heat transfer tube assembly compared with an integral heat transfer tube assembly.

[0058] Specifically, the heat transfer tube assembly can adopt the following several methods:

[0059] First, as shown in Figure 2 , in the heat transfer tube assembly 8, both the first tube 81 and the second tube 82 are flexible insulating tubes, and the connecting tube 83 can be a metal tube or a flexible tube, and is connected by means of a quick connector 84. The heat transfer medium in this heat transfer tube assembly is water or a fluorinated liquid.

[0060] Second, as shown in Figure 2 , in the heat transfer tube assembly 8, both the first tube 81 and the second tube 82 are aluminum tubes, the connecting tube can be a metal tube or a flexible tube, and the first tube 81, the second tube 82, and the connecting tube 83 are connected by an insulating quick connector 84. The heat transfer medium in this heat transfer tube assembly is a fluorinated liquid.

[0061] Third, as shown in Figure 2 , in the heat transfer tube assembly 8, the first tube 81 and the second tube 82 are aluminum tubes, and an insulating layer is provided on the tube wall of the aluminum tubes. The connecting tube 83 is a flexible insulating tube, and the flexible insulating tube is connected to the first tube 81 and the second tube 82 by means of a quick connector 84. The heat transfer medium in this heat transfer tube assembly is water or a fluorinated liquid.

[0062] Fourth, as shown in Figure 3, in the heat transfer tube assembly 8, the first tube 81 and the second tube 82 are aluminum tubes. The walls of the aluminum tubes are provided with an insulating layer, and the connecting tube is a flexible insulating tube. The flexible insulating tube is connected to the first tube and the second tube through a clamp 85; the heat transfer medium in this heat transfer tube assembly is water or a fluorinated liquid;

[0063] The fifth type, see Figure 3 , in the heat transfer tube assembly 8, the first tube 81 and the second tube 82 are aluminum tubes. The walls of the aluminum tubes are provided with an oxide layer and an insulating sleeve is sleeved thereon. The connecting tube 83 is a flexible insulating tube. The flexible insulating tube is connected to the first tube 81 and the second tube 82 through a clamp 85. The heat transfer medium in this heat transfer tube assembly is water or a fluorinated liquid.

[0064] It should be noted that: to ensure the heat conduction effect, 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 prone to bending and breakage during installation. Therefore, in this embodiment, the wall thickness of the aluminum tube is preferably 0.5 mm to 1 mm. The aluminum tube with this wall thickness can maintain the reliability of its installation while having good heat conduction performance, and avoids the risk of being easily bent and damaged when the wall thickness of the aluminum tube is relatively thin. During specific use, the diameter of the aluminum tube is generally about 10 mm to 20 mm.

[0065] In the heat transfer tube assembly 8 of this embodiment, the insulating layer is formed on the wall of the aluminum tube and is an integral structure with the aluminum tube. It can be specifically realized in the following several ways:

[0066] First, form a ceramic coating, that is, a high-temperature electrical insulating coating, on the wall of the aluminum tube to form an insulating layer. The ceramic coating can specifically be a boron nitride or alumina, copper fluoride coating; however, the insulating layer formed by this method is prone to falling off and has a relatively high processing cost;

[0067] Second, coat a layer of insulating material (such as insulating paint, etc.) on the surface of the wall of the aluminum tube to form an insulating layer; this method is convenient for processing and implementation and has a relatively low processing cost;

[0068] Third, perform an oxidation treatment on the aluminum tube to form an insulating layer; the oxidation treatment uses a chemical reaction between the metal surface and oxygen to form an oxide film to improve the insulating performance of the metal surface. For example, an electrochemical oxidation method, etc. Specifically, perform an oxidation treatment on the aluminum tube to form a hard anodized layer. The insulating layer formed by this method is not prone to falling off and has relatively good insulating performance.

[0069] The thicker the thickness of the hard anodized layer formed by the oxidation treatment, the better the insulation performance. However, its heat conduction performance will be reduced. In this embodiment, the thickness of the above-mentioned hard anodized layer is preferably 20 μm to 50 μm. The hard anodized layer with this thickness ensures the insulating performance while also making the wall of the aluminum tube have relatively good heat conduction performance.

[0070] The above-mentioned insulating sleeve can specifically be processed and manufactured using an insulating material with good heat conduction performance, so that while having excellent heat conduction performance, it also has good insulation performance. In this embodiment, the insulating sleeve is a heat-conducting plastic sleeve or a heat-conducting rubber sleeve with both good insulation performance and heat conduction performance. For example, a heat-conducting silica gel sleeve, etc. At the same time, the thickness of the insulating sleeve is preferably 0.1 mm to 1 mm, and this thickness can ensure good heat conduction performance while ensuring excellent insulation performance. The cross-sectional shape of the insulating sleeve can be circular, U-shaped, or C-shaped, as long as it can be sleeved on the aluminum tube with an insulating layer to achieve insulation at the contact between the aluminum tube and the polar terminal 5 of the single battery 2. At the same time, the cross-sectional shape of the above-mentioned insulating sleeve is preferably the same as that of the aluminum tube, so that the insulating sleeve can be tightly nested on the aluminum tube to improve the heat conduction performance of the aluminum tube.

[0071] In some other embodiments, an oxide layer can be directly provided on the wall of the aluminum tube or an insulating sleeve can be sleeved, and the structure is relatively simple.

[0072] The second aspect of the present utility model provides a large-capacity battery, and there are three specific forms of the large-capacity battery:

[0073] The first form, referring to Figure 4 , the large-capacity battery includes a plurality of single batteries 2 arranged in parallel, a first shared pipeline assembly 23, and the above-mentioned heat transfer pipe assembly 8; the first pipe 81 in the heat transfer pipe assembly 8 is fixed in the heat transfer pipe clamping part 7 of the positive terminal of each single battery 2; the second pipe 82 is fixed in the heat transfer pipe clamping part 7 of the negative terminal of each single battery 2;

[0074] The first shared pipeline assembly 23 is connected to the lower cover plate of each single battery 2 and communicates with the electrolyte area in the cavity of the single battery;

[0075] The second form, referring to Figure 4 , the large-capacity battery includes a plurality of single batteries 2 arranged in parallel, a first shared pipeline assembly 23, a second shared pipeline assembly 24, and the above-mentioned heat transfer pipe assembly 8; the first pipe in the heat transfer pipe assembly is fixed in the heat transfer pipe clamping part 7 of the positive terminal of each single battery 2; the second pipe 82 is fixed in the heat transfer pipe clamping part 7 of the negative terminal of each single battery 2;

[0076] The first shared pipeline assembly 23 is connected to the lower cover plate of each single battery 2 and communicates with the electrolyte area in the cavity of the single battery; the second shared pipeline assembly 24 is connected to the upper cover plate of each single battery 2 and communicates with the gas area in the cavity of the single battery.

[0077] The third form, the large-capacity battery includes a housing 1, a plurality of single batteries 2, and a heat transfer pipe assembly 8; the plurality of single batteries 2 are arranged in the housing 1 in the same direction;

[0078] The housing 1 is provided with a shared chamber, and the inner cavity of the shared chamber is communicated with the inner cavities of all the single cells 2;

[0079] Avoidance holes 6 are provided on the top plate 13 of the housing corresponding to the polarity terminals 5 of each single cell 2; the polarity terminals 5 of each single cell 2 extend out of the avoidance holes 6, and the area of the top plate 13 of the housing corresponding to the avoidance holes 6 is fixedly sealed with the housing of the single cell 2;

[0080] A heat transfer tube clamping part 7 is provided at the part where the polarity terminal 5 of each single cell 2 extends out of the avoidance hole 6;

[0081] The heat transfer tube assembly 8 is fixed on the heat transfer tube clamping part 7 of the polarity terminal 5 of each single cell 2, and the heat transfer tube assembly 8 is insulated from each single cell 2.

[0082] It should be noted that:

[0083] The above-mentioned shared chamber can be an electrolyte shared chamber 3 (as Figure 6 shown), the inner cavity of the electrolyte shared chamber 3 is communicated with the electrolyte areas in the inner cavities of all the single cells 2. Through the electrolyte shared chamber 3, each single cell 2 can be in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell 2; improving the performance and charge-discharge cycle life of the large-capacity battery.

[0084] The above-mentioned shared chamber can also be a gas shared chamber 4 (as Figure 6 shown), the inner cavity of the gas shared chamber 4 is communicated with the gas areas in the inner cavities of all the single cells 2. Through the gas shared chamber 4, the gas balance of each single cell 2 is realized, and the performance and charge-discharge cycle life of the large-capacity battery can also be improved.

[0085] The above-mentioned shared chamber can also be a gas-liquid shared chamber. The inner cavity of the gas-liquid shared chamber is communicated with both the electrolyte area and the gas area in the inner cavities of all the single cells 2. Through one gas-liquid shared chamber, each single cell 2 can be in a unified electrolyte environment and gas environment, improving the performance and charge-discharge cycle life of the large-capacity battery.

[0086] In this form, a plurality of single cells are placed inside a housing having a shared chamber, and the shared chamber is communicated with the inner cavities of the respective single cells located inside the housing, so that the electrolytes and / or gases of each single cell are shared to ensure the consistency of each single cell, that is, the electrolytes and / or gases of each single cell are communicated, so that the electrolytes and / or gases of all the single cells are in the same system, reducing the differences between each single cell, improving the consistency between each single cell to a certain extent, and thus improving the cycle life of the large-capacity battery to a certain extent.

[0087] The above-mentioned shared chamber can also be a gas shared chamber 4 (as Figure 6As shown in the figure, the explosion venting part of the gas sharing chamber 4 covering the top of each single cell, when any single cell undergoes thermal runaway, this gas sharing chamber can release the thermal runaway flue gas to the outside so that it can be processed by an external thermal runaway flue gas treatment device.

[0088] It should be noted that the polar terminal 5 of the single cell 2 described here can be the pole column of the single cell 2. If it is to avoid the pole column of the single cell 2 not being able to smoothly extend out of the avoidance hole 6 as the polar terminal 5, a pole column adapter can also be connected to the pole column of the single cell 2, and the overall structure formed by the cooperation of the pole column of the single cell 2 and the pole column adapter is used as the polar terminal 5 of the single cell 2.

[0089] Meanwhile, a heat transfer tube assembly is fixed at the part where each single cell polar terminal extends out of the avoidance hole. The heat transfer tube assembly is in direct contact with each single cell polar terminal, and timely conducts heat away. This heat dissipation method realizes the balanced heat dissipation of each single cell in the large-capacity battery, and improves the use safety of the large-capacity battery.

[0090] The following will describe the large-capacity battery in the third form in detail with reference to the accompanying drawings and specific embodiments.

[0091] Embodiment 1

[0092] Combined with Figure 5 and Figure 6 It can be seen that the large-capacity battery in this embodiment includes a housing 1 and single cells 2 arranged in the housing 1.

[0093] The single cells 2 in this embodiment are square shell batteries, and the number is 13. In other embodiments, the number can be adjusted according to actual needs. The inner cavity of each single cell 2 includes an electrolyte area and a gas area.

[0094] For the convenience of description, the length direction of the housing 1 is defined as the x direction, the width direction of the housing 1 is defined as the y direction, the height direction of the housing 1 is defined as the z direction, and the housing 1 is disassembled into a cylindrical body 11 with both ends open and end plates 12 covering the open ends of the cylindrical body 11.

[0095] On the bottom plate 14 of the housing (bottom plate of the cylindrical body), an electrolyte sharing chamber 3 is provided along the x direction, and the inner cavity of the electrolyte sharing chamber 3 is communicated with the electrolyte areas of the inner cavities of each single cell 2.

[0096] On the top plate 13 of the housing (top plate of the cylindrical body), a gas sharing chamber 4 is provided along the x direction, and the inner cavity of the gas sharing chamber 4 is communicated with the gas areas of the inner cavities of each single cell 2.

[0097] In some other embodiments, only the electrolyte sharing chamber 3 or the gas sharing chamber 4 may be provided, or a gas-liquid sharing chamber may be provided on the side wall of the outer casing 1 along the x direction, and the inner cavity of the gas-liquid sharing chamber is communicated with the electrolyte regions and the gas regions of the inner cavities of the respective single cells 2.

[0098] In this embodiment, the electrolyte sharing chamber 3 is a liquid channel provided on the bottom plate 14 of the outer casing, and the specific structure can be referred to Figure 7 , Figure 8 and Figure 9 :

[0099] Figure 7 is a partial structural schematic diagram of the large-capacity battery outer casing 1 in this embodiment, that is, a structural schematic diagram of the cylinder body 11; Figure 8 is in Figure 4 A bottom support member 9 is added in the cylinder body 11 to form a structural schematic diagram of the electrolyte sharing chamber 3; Figure 9 is a structural schematic diagram of the bottom support member 9 in this embodiment;

[0100] From Figure 7 it can be seen that the left and right ends of the cylinder body 11 in this embodiment are open, and an aluminum extrusion process can be used for integral forming.

[0101] Figure 8 In

[0102] 1. Raise each single cell 2 so that the polarity terminals 5 of each single cell 2 extend out of the avoidance holes 6 in the top plate 13 of the outer casing;

[0103] 2. Support each single cell 2 and form a liquid channel with the bottom of each single cell 2 as the electrolyte sharing chamber 3.

[0104] Combined with Figure 6 it can be seen that an electrolyte sharing chamber 3 is formed between the bottom support member 9 and the bottom of each single cell 2 in this embodiment.

[0105] From Figure 9 it can be seen that the bottom support member 9 in this embodiment is made of aluminum, and its main part is a flat plate, and the shape and size of the flat plate are adapted to the shape and size of the bottom plate 14 of the outer casing. Second support ribs 92 extending in the x direction are provided on the lower surface of the flat plate, and first support ribs 91 extending in the x direction are provided on the upper surface of the flat plate.

[0106] In this embodiment, there are two second support ribs 92, and the main function is to raise each single cell 2 so that the polarity terminals 5 of each single cell 2 extend out of the avoidance holes 6 in the top plate 13 of the outer casing.

[0107] Combined with Figure 6It can be seen that the bottom support member 9 is placed inside the cylinder body 11 and is located between each single battery 2 and the outer shell bottom plate 14.

[0108] It should be noted that during the assembly of the large-capacity battery, the port of the channel 19 formed between the bottom support member 9 and the outer shell bottom plate 14 needs to be sealed by the baffle 18 to prevent the electrolyte from flowing into the channel and increasing the amount of electrolyte used in the entire large-capacity battery (as Figure 6 shown).

[0109] In addition, the edge of the bottom support member 9 along the x direction should be sealed with the side wall of the cylinder body parallel to the xz plane to prevent the electrolyte from seeping into the channel. The sealing between the two can be achieved by adding a sealing strip or sealant; lightweight materials can also be filled in the channel to fill the channel. The lightweight materials here should not react with the electrolyte, and solid columns made of PP material can be selected, which also have a lower cost compared to aluminum. Even if there is a gap between the bottom support member 9 and the side wall of the cylinder body parallel to the xz plane, since the channel has been filled, too much electrolyte will not enter the channel.

[0110] In some other embodiments, the same purpose can be achieved by thickening the size of the flat plate. However, compared with this embodiment, it has a higher material cost and makes the self-weight of the entire large-capacity battery larger. In this embodiment, by providing the second support rib 92, the thickness of the flat plate can be minimized as much as possible on the premise of meeting the support strength, reducing the material cost and the self-weight of the large-capacity battery.

[0111] In this embodiment, there are three first support ribs 91, and each support rib extends along the x direction. The three support ribs are evenly arranged along the y direction. In order to improve the electrolyte sharing effect, a notch 911 is opened on the middle first support rib 91 to ensure that the liquid channels on both sides of it are interconnected.

[0112] The structure of the single battery 2 corresponding to the electrolyte sharing chamber 3 of this type of structure is as Figure 10 and Figure 11 shown:

[0113] In this embodiment, two first through holes 161 are opened on the lower cover plate 16 of the single battery. The two first through holes 161 are arranged along the y direction and are symmetric to each other. The two first through holes 161 are sealed by the sealing assembly 10; after the single battery 2 is installed in the above-mentioned cylinder body 11, the two first through holes 161 are respectively located directly above the two liquid channels. Through external force or external electrolyte (the external electrolyte here refers to the electrolyte outside the single battery 2), the sealing assembly 10 can fall off from the lower cover plate or form an opening penetrating the first through hole 161 in the sealing assembly 10 to communicate with the liquid channel.

[0114] From Figure 10As can be seen, in this embodiment, the two first through holes 161 are located on both sides of the lower cover plate 16 of the single cell. When the core inside the single cell 2 is a wound core, there is a relatively large space between the side wall in the thickness direction of the single cell 2 housing and the core. By opening the first through holes 161 near both sides of the lower cover plate 16 of the single cell, first, when opening the first through holes 161, there is no impact on the internal core structure. Second, after opening the sealing component 10 at this part, the electrolyte in the inner cavity of the electrolyte sharing chamber 3 can better enter the inner cavity of the single cell 2.

[0115] The size of the first through hole 161 needs to meet the following conditions:

[0116] 1. The first through hole 161 cannot be too large to ensure that the entire lower cover plate 16 of the single cell has a certain strength and avoid scrapping the single cell 2 due to poor strength of the lower cover plate 16 of the single cell before opening the sealing component 10 at the position of the first through hole 161.

[0117] 2. The first through hole 161 cannot be too small to ensure that after opening the sealing component 10 at the position of the first through hole 161, the electrolyte areas in the inner cavities of the individual single cells 2 and the inner cavity of the electrolyte sharing chamber 3 are smoothly connected, ensuring a good sharing effect.

[0118] In this embodiment, the sealing component 10 can adopt the sealing film disclosed in Chinese Patent CN218525645U; two types of sealing films are disclosed in this patent. One type of sealing film can be dissolved in the electrolyte, and the other type of sealing film can be opened under an external force.

[0119] When adopting the sealing film that can be dissolved in the electrolyte, generally, a protective film that is insoluble in the electrolyte needs to be provided on the side of the sealing film facing the inside of the single cell 2 housing. When the sealing film is dissolved in the electrolyte, the protective film will fall off accordingly.

[0120] When adopting such a sealing film, the liquid path unpacking can be carried out through the following process:

[0121] After completing the assembly of the large-capacity battery and injecting the electrolyte into the electrolyte sharing chamber 3, the sealing films at the two first through holes 161 can be automatically dissolved from the outside; since the protective film is not fixed to the lower cover plate 16 of the single cell in any way, when the sealing film is dissolved, the protective film will automatically fall off from the cover plate, thereby making the electrolyte sharing chamber 3 communicate with the inner cavity of the single cell 2, enabling the electrolytes of all single cells 2 to be in the same system and achieving the electrolyte sharing effect. In this embodiment, during the unpacking process, even if the sealing film at one of the first through holes 161 is not completely dissolved, the electrolyte sharing effect can still be achieved through the other first through hole 161 (the sealing film at this first through hole 161 is dissolved).

[0122] A sealing film that can be opened under the action of an external force is adopted. Generally, a traction ring can be provided on the sealing film, and by pulling the traction ring with an external force, an opening can be formed at the sealing film.

[0123] The liquid path unpacking can be carried out through the following process:

[0124] After the assembly of the large-capacity battery is completed, the traction ring is pulled with a traction tool, and each sealing film is torn or detached from the first through hole 161, thereby making the electrolyte sharing chamber 3 communicate with the inner cavity of the single battery 2, so that the electrolytes of all single batteries 2 are in the same system, achieving the effect of electrolyte sharing. During the unpacking process, even if the sealing film at one of the first through holes 161 is not torn or detached, the electrolyte sharing effect can also be achieved through another first through hole 161 (the sealing film of this first through hole 161 is torn or completely detached).

[0125] In some other embodiments, one or more than two first through holes 161 can be opened on the lower cover plate 16 of the single battery. When there is one first through hole 161, this first through hole 161 is usually located at the geometric center of the lower cover plate 16 of the single battery. When there are more than two first through holes 161, each first through hole 161 can be evenly distributed on the lower cover plate 16 of the single battery. The size of the first through hole 161 still needs to meet the above two conditions. At the same time, the position of the first support rib 91 needs to be adjusted according to the position of the first through hole 161 of the single battery 2. For example, when there is one first through hole 161 and this first through hole 161 is located at the geometric center of the lower cover plate 16 of the single battery, only two first support ribs 91 can be provided, and a liquid channel is formed between the two first support ribs 91, which can be connected to the first through hole 161 of the single battery 2.

[0126] In some other embodiments, it can also be adopted Figure 12 the electrolyte sharing chamber 3 as shown, that is, support ribs are directly arranged on the outer shell bottom plate 14 along the x direction, and a liquid channel is formed between the two support ribs as the electrolyte sharing chamber 3. The support ribs here also have the following two functions:

[0127] 1. Lift each single battery 2 so that the polar terminals 5 of each single battery 2 extend out of the avoidance hole 6 of the outer shell top plate 13;

[0128] 2. Support each single battery 2 and form a liquid channel with the bottom of each single battery 2 as the electrolyte sharing chamber 3.

[0129] However, compared with this embodiment, the formed electrolyte sharing chamber 3 has a larger size in the z direction, which further makes the electrolyte consumption of such large-capacity batteries more, and has a higher cost.

[0130] Specifically, Figure 12As shown in the electrolyte sharing chamber 3, in the z direction, the size of the electrolyte sharing chamber 3 is equal to the size of the support ribs, resulting in a relatively large volume of the electrolyte sharing chamber 3. Consequently, a larger amount of electrolyte is required in the entire electrolyte sharing chamber 3 (it should be noted that since there is no sealed setting between the lower cover plates 16 of each single battery and the support ribs, the electrolyte will also diffuse into the cavity formed between the two support ribs and the housing 1 through the gap between them), increasing the cost of such large-capacity batteries.

[0131] However, the present utility model considers setting two types of support ribs on the same support member. The first type of support ribs mainly functions to construct the electrolyte sharing chamber 3, and the second type of support ribs mainly functions to raise each single battery 2. In this way, the height of the first type of support ribs in the z direction can be minimized to reduce the volume of the electrolyte sharing chamber 3, thereby reducing the amount of electrolyte used. Since the height of the first type of support ribs in the z direction is reduced, it may cause the polar terminals 5 of each single battery to not smoothly extend out of the corresponding avoidance holes 6. At this time, the height of the second type of support ribs in the z direction can be increased to ensure that the polar terminals 5 of each single battery smoothly extend out of the corresponding avoidance holes 6. As Figure 9 can be clearly seen, in the z direction, the size of the first support rib 91 of the present utility model is smaller than the size of the second support rib 92. Therefore, based on the bottom support member 9, the present utility model ensures that under the premise of a relatively small volume of the electrolyte sharing chamber, the polar terminals 5 of the single battery can still extend out of the corresponding avoidance holes 6 on the top plate 13 of the housing.

[0132] In this embodiment, the gas sharing chamber 4 is a gas channel provided on the top plate 13 of the housing. The specific structure is as Figure 7 and Figure 8 shown. The top plate 13 of the housing is provided with a protrusion extending in the x direction, and a gas channel extending in the x direction is formed at the protrusion part. When the cylinder 11 is processed by an aluminum extrusion process, this gas channel can be extruded simultaneously.

[0133] The structure of the single battery 2 corresponding to the gas sharing chamber 4 of this type of structure is as Figure 13 and Figure 14 shown:

[0134] In this embodiment, a second through hole 171 is formed in the upper cover plate 17 of the single battery, and the second through hole 171 is located between the two polar terminals 5 of the single battery 2. The sealing component 10 is used to seal the second through hole 171; after the single battery 2 is installed in the above-mentioned cylinder 11, the second through hole 171 is located below the gas sharing chamber 4. Through external force or external electrolyte (the external electrolyte here refers to the electrolyte outside the single battery 2), the sealing component 10 can fall off from the upper cover plate or form an opening penetrating the second through hole 171 in the sealing component 10, so as to communicate with the gas sharing chamber 4. The specific penetration method (i.e., the unpacking method) is similar to the liquid path unpacking process and will not be elaborated here.

[0135] As Figure 7 and Figure 8 shown, in this embodiment, the outer shell top plate 13 is provided with avoidance holes 6 that can enable the polar terminals 5 of each single battery 2 to extend out; the polar terminals 5 of each single battery 2 extend out of the corresponding avoidance holes 6, and the area of the outer shell 1 around the avoidance holes 6 is fixedly sealed with the shell of the single battery 2. It can be seen from the figure that the polar terminal 5 of the single battery 2 in this embodiment is the pole column of the single battery 2, and the pole column of such a single battery 2 is higher than that of the conventional commercially available square shell battery.

[0136] Combined with Figure 5 and Figure 6 , it can be seen that in this embodiment, a through groove is formed at the part where the polar terminal 5 of the single battery 2 extends out of the avoidance hole 6 as the heat transfer tube clamping part 7; from Figure 11 , it can be seen that the polar terminal 5 of the single battery 2 in this embodiment is a cylinder, including a first end face, a second end face 52 and a side wall 53 (the first end face and the second end face 52 are parallel to each other), and the through groove is formed in the side wall 53 of the polar terminal, that is, the opening of the through groove is located on the side wall 53.

[0137] In some other embodiments, through holes can also be formed in the side wall 53, that is, the openings of the through holes are located on the side wall 53.

[0138] In some other embodiments, through grooves can also be formed on the second end face 52, that is, the openings of the through grooves are located on the second end face 52.

[0139] The second end face 52 serves as the electrical connection part of the polar terminal 5 and is used to connect with the first electrical connector 21 and / or the second electrical connector 22 to realize the electrical connection between each single battery 2 and / or two large-capacity batteries; the first end face is used to be electrically connected with the electrode assembly in the shell of the single battery 2.

[0140] A through groove and a through hole are formed in the side wall 53. Compared with forming a through groove in the second end face 52, the heat transfer tube assembly 8 has a larger contact area with the inner wall of the through groove or through hole in the through groove or through hole, and has a higher heat exchange efficiency. In addition, when the through groove and the through hole are located in the side wall 53, the entire area of the second end face 52 can be used as an electrical connection area. Two through grooves or through holes can also be provided on the side wall 53 of the polar terminal at the same time to increase the number of heat transfer tube assemblies placed and further improve the heat exchange efficiency. Compared with the through hole structure, the heat transfer tube assembly 8 is easier to install in the through groove.

[0141] The cross section of the through groove is C-shaped. For a through groove with a C-shaped cross section, the opening width is smaller than the widest part of the through groove. Such a design is beneficial for the first tube or the second tube to be press-fitted into the through groove. The arcs formed at both ends of the C-shaped through groove have natural tension, which is beneficial for tightly clamping the first tube or the second tube in the through groove.

[0142] The assembly of the large-capacity battery in this embodiment can be completed through the following process:

[0143] Step 1: Machine the cylinder body 11 and two end plates 12.

[0144] Step 2: Perform grading and sorting to screen multiple single cells 2 that meet the requirements; after forming a first through hole 161 in the lower cover plate 16 of the single cell, seal it with the sealing assembly 10; after forming a second through hole 171 in the upper cover plate 17 of the single cell, seal it with the sealing assembly 10; arrange multiple single cells 2 with the sealing assembly 10 in the cylinder body 11 of Step 1.

[0145] The specific arrangement process is as follows:

[0146] Fix multiple single cells 2 into a whole and push them into the inner cavity of the cylinder body 11 from any open end of the cylinder body 11; at this time, the bottoms of the single cells 2 are in contact with the outer shell bottom plate 14, and the polar terminals 5 of the single cells 2 correspond to the corresponding avoidance holes 6 but do not extend out of the avoidance holes 6; then use a lifting tool to support multiple single cells 2 from the bottom, so that the bottoms of the single cells 2 are separated from the outer shell bottom plate 14, and the polar terminals 5 of the single cells 2 extend out of the corresponding avoidance holes 6; then, insert a bottom support member 9 between each single cell 2 and the outer shell bottom plate 14 in the x direction and remove the lifting tool.

[0147] It is also possible to flip the cylinder body 11 so that the top plate of the cylinder body 11 faces down, fix multiple single cells 2 into a whole and push them into the inner cavity of the cylinder body 11 from any open end of the cylinder body 11; or push multiple single cells 2 into the inner cavity of the cylinder body 11 from any open end of the cylinder body 11 in sequence; under the action of gravity, the polar terminals 5 of the single cells 2 extend out of the corresponding avoidance holes 6, and insert a bottom support member 9 between the bottoms of the single cells 2 and the outer shell bottom plate 14; then flip the cylinder body 11 so that the top plate of the cylinder body 11 faces up.

[0148] It should be noted that in the z - direction, the size of the bottom support member 9 needs to meet the requirement that after adding the bottom support member 9 between the bottom of each single - cell battery 2 and the outer - shell bottom plate 14, the polar terminals 5 of each single - cell battery 2 extend out of the corresponding avoidance holes 6.

[0149] Step 3: Seal the peripheral part of the avoidance hole 6 and the polar terminal of the single - cell battery 2 housing; weld the two end plates 12 to the two opposite open ends of the cylinder 11.

[0150] Step 4: Use an external force or the electrolyte itself to open the sealing assembly 10, so that the electrolyte areas in the inner cavity of the electrolyte sharing chamber 3 and the inner cavities of each single - cell battery 2 are connected, and the gas areas in the inner cavity of the gas sharing chamber 4 and the inner cavities of each single - cell battery 2 are connected.

[0151] After the inner cavities of each single - cell battery 2 and the electrolyte sharing chamber 3 are connected, the electrolytes in the inner cavities of each single - cell battery 2 are all connected through the electrolyte sharing chamber 3. To prevent the phenomenon of electrolyte interruption, after the inner cavities of each single - cell battery 2 and the electrolyte sharing chamber 3 are connected, electrolyte can be injected into the electrolyte sharing chamber 3 to ensure the continuity of the electrolyte.

[0152] After that, the heat - transfer tube assembly is fixed in the through - slots on each polar terminal 5, and all single - cell batteries 2 are connected in parallel using the first electrical connector 21 as shown in Figure 12 This step can also be carried out before Step 4.

[0153] To form a more complete SEI film and enable the large - capacity battery to have a more stable cycling ability, after injecting electrolyte into the inner cavities of each single - cell battery 2 through the electrolyte sharing chamber 3, the entire large - capacity battery is formed.

[0154] Embodiment 2

[0155] During long - term use, due to the temperature difference inside and outside the heat - transfer tube assembly 8, condensation will occur on the surface. When the condensation accumulates to a certain amount, it will seep into the gap between the polar terminal 5 and the avoidance hole 6, resulting in electrical conduction between the polar terminal 5 and the outer shell 1, and further possibly causing a short - circuit situation in the same single - cell battery 2.

[0156] In this embodiment, by optimizing the top structure of the large-capacity battery, an insulating and sealing adhesive layer 20 is laid on the outer shell top plate 13 to overcome the above problems. The electrical connection parts (the second end faces 52) of the polar terminals 5 of each single battery 2 extend out of the insulating and sealing adhesive layer 20 for connection with the first electrical connector 21 or the second electrical connector 22; the liquid inlet end and the liquid outlet end of the heat transfer tube assembly 8 extend out of the insulating and sealing adhesive layer 20 for connection with the liquid cooling device. The first electrical connector 21 is a connecting device for realizing the parallel connection of each single battery 2, and the second electrical connector 22 is a connecting device for realizing the series connection of two large-capacity batteries, or can also be a connecting device for connecting the large-capacity battery with an external load.

[0157] As Figure 16 shown, in this embodiment, an insulating and sealing adhesive layer 20 is laid on the outer shell top plate 13. It can be seen from the figure that part of the area of the polar terminals 5 of each single battery 2 is covered by the insulating and sealing adhesive layer 20, and the electrical connection parts (i.e., the second end faces 52) of the polar terminals 5 of each single battery 2 extend out of the insulating and sealing adhesive layer 20 for connection with the first electrical connector 21 and / or the second electrical connector 22; the main body part of the heat transfer tube assembly 8 is covered by the insulating and sealing adhesive layer 20, and the liquid inlet end and the liquid outlet end of the heat transfer tube assembly 8 extend out of the insulating and sealing adhesive layer 20 for connection with the liquid cooling device.

[0158] In some other embodiments, the dimension of the insulating and sealing adhesive layer 20 in the z direction can be smaller, lower than the main body part of the heat transfer tube assembly 8, or only cover part of the area of the main body part of the heat transfer tube assembly 8; as long as it is ensured that condensation cannot enter the gap between the polar terminal 5 and the avoidance hole 6.

[0159] The insulating and sealing adhesive used in this embodiment is generally the commonly used battery potting adhesive for batteries. For example, silicone thermal conductive potting adhesive can be used, as long as it has good functions such as sealing, insulation, vibration resistance, heat dissipation and waterproofing.

[0160] In order to prevent the insulating and sealing adhesive liquid from overflowing, in the process of injecting the adhesive in this embodiment, an injection mold can also be added to the four peripheries of the outer shell top plate 13 to ensure that the insulating and sealing adhesive liquid can be injected smoothly. After the injection is completed, demolding can be carried out.

[0161] Combined Figure 17 , there are two first electrical connectors 21 in this embodiment. One of the first electrical connectors 21 is connected to the second end faces 52 of the positive polar terminals of all single batteries 2 in the large-capacity battery; the other first electrical connector 21 is connected to the second end faces 52 of the negative polar terminals of all single batteries 2 in the large-capacity battery. Thus, the parallel connection of all single batteries 2 in the large-capacity battery is realized.

[0162] It can be seen from the figure that the first electrical connector 21 in this embodiment is a metal plate, and metal materials such as copper and aluminum can be selected. Based on cost considerations, aluminum is selected in this embodiment.

[0163] The first electrical connector 21 and the polar terminal 5 of the single battery 2 can be connected by screws or by welding. Considering the reliability of the connection, in this embodiment, the connection between the two is achieved by welding.

[0164] In this embodiment, there are 13 second electrical connectors 22, which are fixed to the electrical connection parts of the polar terminals 5 of each single battery 2; in some other embodiments, the number of the second electrical connectors 22 can be determined according to actual needs, and they can be directly connected to the first electrical connector 21.

[0165] Embodiment 3

[0166] In the above embodiments, the polar terminal 5 is directly exposed to the external environment, and there are relatively large potential safety hazards due to the electrification of the polar terminal 5 during use. Based on this, as Figure 18 and Figure 19 shown, on the basis of the above embodiments, in this embodiment, an insulating protective cover 15 is provided on the top of the large-capacity battery, so as to provide insulating protection for the polar terminal 5, avoiding potential safety hazards that may exist when the polar terminal 5 is exposed during the operation of the large-capacity battery, and also avoiding the problem that some foreign objects in the external environment fall into the position of the polar terminal 5 and cause a short circuit of the large-capacity battery, thus improving the safety of the large-capacity battery.

[0167] It should be noted that if the insulating protective cover 15 completely wraps the polar terminal 5, it will make the electrical connection of such large-capacity batteries more difficult. Therefore, in this embodiment, a slit 153 is opened on the side wall of the insulating protective cover 15 parallel to the xz plane. Through this slit 153, the second electrical connector 22 can be connected to the polar terminal 5, thereby realizing electrical connection.

[0168] It should also be noted that channels for the liquid inlet end and the liquid outlet end of the heat transfer tube assembly 8 to extend out need to be opened on the side wall of the insulating protective cover 15.

[0169] In order to facilitate the electrical connection process, in this embodiment, the insulating protective cover 15 is designed as a split structure, as Figure 19 shown, including an insulating frame body 151 and an insulating cover plate 152 covering the insulating frame body 151; the lower end of the insulating frame body 151 is used to cooperate with the top of the large-capacity battery and is fixed to the top of the large-capacity battery by means of screw connection or bonding, etc. The insulating cover plate 152 is buckled and installed on the upper end of the insulating frame body 151. A notch is opened at the upper end of the side wall of the insulating frame body 151 parallel to the xz plane, and this notch cooperates with the insulating cover plate 152 to form the above-mentioned slit 153.

[0170] During assembly, the insulating frame body 151 can be first fixed to the top of the large-capacity battery, and then the second electrical connector 22 is connected to the polar terminal 5 through the slit 153. After injecting glue, the insulating cover plate 152 is fixed to the upper end of the insulating frame body 151.

[0171] In addition, in Embodiment 3, during the glue injection process, in order to prevent the insulating sealant from overflowing, a glue injection mold needs to be used. However, after the glue injection, demolding is required, and the process is relatively complex. In addition, during the demolding process, the structure of the insulating sealant layer 20 may be damaged, resulting in a reduction in sealing reliability.

[0172] In this embodiment, the insulating frame 151 of the insulating protective cover 15 can be used as a glue injection mold. After the glue injection is completed, demolding is not required, and at the same time, the bonding strength between the insulating frame 151 and the top of the large-capacity battery can be improved.

Claims

1. A heat transfer tube assembly, used for heat exchange with each single cell in a large-capacity battery, characterized in that: The heat transfer tube assembly includes a first tube, a second tube and a connecting tube; The first tube is used to be fixed in the heat transfer tube clamping part of the positive polarity terminal of each single cell; the second tube is used to be fixed in the heat transfer tube clamping part of the negative polarity terminal of each single cell; Both ends of the connecting tube are respectively connected to ports of the first tube and the second tube located on the same side; The first tube and the second tube are aluminum tubes, the tube walls of the aluminum tubes are provided with an oxide layer, and an insulating sleeve is sleeved on the aluminum tubes with the oxide layer.

2. A heat transfer tube assembly according to claim 1, characterized in that: The connecting pipe is a flexible insulating pipe, and the flexible insulating pipe is connected to the first pipe and the second pipe through a clamp.

3. A large-capacity battery, comprising a plurality of single cells connected in parallel, characterized in that: It also includes a first shared pipeline assembly and a heat transfer tube assembly as described in claim 1 or 2; the first shared pipeline assembly is connected to the lower cover plate of each single battery and is connected to the electrolyte area of ​​the inner cavity of the single battery; the heat exchange medium flowing in the heat transfer tube assembly is water or fluorinated liquid.

4. The large-capacity battery according to claim 3, characterized in that: It also includes a second shared pipeline assembly; the second shared pipeline assembly is connected to the upper cover plate of each single battery and communicates with the gas area of ​​the inner cavity of the single battery.

5. A large capacity battery, characterized in that: It comprises a housing, a plurality of single cells connected in parallel, and a heat transfer tube assembly as claimed in claim 1 or 2; A plurality of single cells are arranged in the housing in the same direction; The shell is provided with a shared chamber, and the inner cavity of the shared chamber is connected with the inner cavities of all the single batteries; The outer shell top plate is provided with avoidance holes corresponding to the polarity terminals of each single battery; the polarity terminals of each single battery extend out of the avoidance holes, and the outer shell top plate area corresponding to the avoidance holes is fixedly sealed with the single battery shell; A heat transfer tube clamping portion is provided at the location where the polarity terminal of each single battery extends out of the avoidance hole; The heat transfer tube assembly is fixed on the heat transfer tube clamping part of each single battery polarity terminal, and the heat transfer tube assembly is electrically insulated from each single battery.

6. The large-capacity battery according to claim 5, characterized in that: The shared chamber is an electrolyte shared chamber, which is a liquid channel located between the bottom plate of the housing and each single cell. The liquid channel is connected to the electrolyte area in the inner cavity of each single cell.

7. The large-capacity battery according to claim 5 or 6, characterized in that: The shared chamber is a gas shared chamber, which is a gas channel located between the top plate of the housing and each single cell. The gas channel is connected to the gas area of ​​the inner cavity of each single cell.

8. The large-capacity battery according to claim 5 or 6, characterized in that: The shared chamber is a gas shared chamber, and the gas shared chamber covers the explosion venting part on the top of each single battery.

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