Upper cover assembly, single battery and high-capacity battery

Abstract

The utility model belongs to the field of batteries, and particularly relates to an upper cover assembly, a single battery and a high-capacity battery, the upper cover assembly comprises an upper cover plate and a polarity terminal arranged on the upper cover plate; a channel penetrating through the polarity terminal is formed in the polarity terminal, and an inner cavity of the channel serves as a heat exchange medium circulation channel. Partial structures of the polar terminals are in direct contact with the heat exchange medium; after the single battery with the upper cover assembly is used for constructing a high-capacity battery, the connecting pipe assembly is used for communicating the channels on the polar terminals to form a heat exchange channel. And the heat exchange medium directly acts on the polar terminal, so that the utilization efficiency of the heat exchange medium can be improved, and the heat exchange efficiency of the high-capacity battery is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery field, concretely is a kind of upper cover subassembly, monomer battery and large capacity battery. BACKGROUND

[0002] At present, multiple monomer batteries are connected in parallel, series or series-parallel to form large capacity battery (also called battery module or battery pack) on the market.

[0003] However, there are differences among each monomer battery in the existing large capacity battery, and due to the existence of the bucket effect, the performance of the worst monomer battery often affects the entire large capacity battery, resulting in a great limitation on the capacity upper limit and cycle times of the entire large capacity battery. Therefore, how to improve the uniformity of each monomer battery in the large capacity battery has become the focus and difficulty of research in this field.

[0004] In order to solve the above problems, a large capacity battery is disclosed in Chinese patent CN220797038U, and its structure is as shown in Figure 1 The large capacity battery includes a shell and multiple monomer batteries.

[0005] The length direction of the shell is defined as the x direction, the width direction is defined as the y direction, and the height direction is defined as the z direction.

[0006] The multiple monomer batteries are arranged in the inner cavity of the shell along the x direction.

[0007] The shell bottom plate is provided with an electrolyte sharing chamber, and the electrolyte sharing chamber is in communication with the electrolyte area of each monomer battery inner cavity. The electrolyte of each monomer battery inner cavity is connected through the electrolyte sharing chamber, so that the electrolyte of all monomer batteries is in the same system, reducing the difference between the electrolytes of each monomer battery, and improving the consistency between each monomer battery to a certain extent, thereby improving the cycle life of the large capacity battery to a certain extent.

[0008] The shell top plate is provided with an avoiding hole through which the polarity terminal of each monomer battery can extend, and the region of the shell top plate corresponding to the avoiding hole and the monomer battery upper cover plate are fixed and sealed.

[0009] It should be noted that the above-mentioned monomer battery polarity terminal can be a monomer battery pole, and if the monomer battery pole cannot smoothly extend out of the avoiding hole or the height of the monomer battery pole extending out of the avoiding hole does not meet the set requirements, a pole adapter can be connected to the monomer battery pole, and the entire structure of the monomer battery pole and the pole adapter combined together can be used as the monomer battery polarity terminal.

[0010] The above-mentioned large-capacity batteries will release heat during use. If the heat exchange is not timely, the battery life will be greatly shortened, energy loss will be aggravated, and even safety hazards such as spontaneous combustion and fire will occur. Therefore, it is particularly important to improve the heat exchange efficiency of the above-mentioned large-capacity batteries.

[0011] In order to improve the heat exchange efficiency of the above-mentioned large-capacity battery, Chinese patent CN118299714A discloses a large-capacity battery, such as Figure 2 As shown, the patent provides a slot at the polarity terminal of the large-capacity battery extending out of the avoidance hole. A heat exchange element 01 is fixed in the slot, effectively achieving heat exchange for the large-capacity battery. The larger the contact area between the polarity terminal and the heat exchange element, the better the heat exchange effect. In other words, the larger the slot surface area, the greater the contact area between the polarity terminal and the heat exchange element, and the better the heat exchange effect. However, if the slot surface area is too large, it will affect the overall structure of the polarity terminal and thus its conductivity. Summary of the Invention

[0012] The purpose of the utility model is to provide an upper cover assembly, a single cell and a large-capacity battery, which can improve the heat exchange performance of the entire large-capacity battery by optimizing the heat exchange structure, shortening the heat exchange path, without affecting the conductive performance.

[0013] The first aspect of the present invention provides an upper cover assembly, comprising an upper cover plate and a polarity terminal arranged on the upper cover plate; a channel penetrating the polarity terminal is provided on the polarity terminal, and the inner cavity of the channel serves as a heat exchange medium circulation channel.

[0014] The utility model provides a channel on the polarity terminal as a flow channel for the heat exchange medium, that is, part of the structure of the polarity terminal (the inner wall of the channel) is in direct contact with the heat exchange medium; after a large-capacity battery is constructed using a single cell with the above-mentioned upper cover assembly, the channels on the polarity terminals are connected using a connecting pipe assembly to form a heat exchange channel.

[0015] In contrast, the solution of Chinese patent CN118299714A shortens the heat exchange path from "heat exchange medium-heat exchange component-polarity terminal" to "heat exchange medium-polarity terminal". The heat exchange medium directly acts on the polarity terminal, which can improve the utilization efficiency of the heat exchange medium and thus improve the heat exchange efficiency of such large-capacity batteries. In addition, due to the use of direct heat exchange, it has a better heat exchange effect. Therefore, the cross-sectional area of ​​the channel does not need to be too large, which does not affect the conductive performance of the polarity terminal.

[0016] Furthermore, the inner wall of the channel is provided with a dividing rib plate for increasing the heat exchange area. By providing the dividing rib plate in the channel, the contact area between the heat exchange medium and the polarity terminal can be increased, thereby increasing the heat exchange area and further improving the heat exchange effect.

[0017] Further, the split fins are multiple, and the multiple split fins are evenly distributed along the circumference of the channel, so that the temperature uniformity of each part of the polar terminal is better, and each split fin extends along the axial direction of the channel, without affecting the flowability of the heat transfer medium in the channel.

[0018] Further, the upper cover plate is further provided with an opening element.

[0019] The second aspect of the utility model further provides a single battery, including shell body and electrode assembly and electrolyte in shell body;Wherein the shell body is enclosed by the above upper cover assembly, cylinder and lower cover assembly.

[0020] Further, the lower cover assembly is provided with an opening element.

[0021] The third aspect of the utility model provides a large capacity battery, including connecting pipe assembly and multiple above-mentioned single batteries arranged along the same direction;The connecting pipe assembly communicates the channels on the polar terminals of the single batteries, forming a heat exchange channel;Heat transfer medium is introduced into the heat exchange channel, realizing the heat dissipation of the large capacity battery or the heating of the large capacity battery;By controlling the temperature of the heat transfer medium, the large capacity battery can always operate at normal working temperature.

[0022] Further, the connecting pipe assembly includes multiple second sub connecting pipes;Both ends of each second sub connecting pipe are respectively and sealingly connected with the channels on the polar terminals of the adjacent single batteries on the same side, forming two first heat exchange channels at the top of the large capacity battery.When the channels are provided with multiple split fins extending along the axial direction of the channel, the end faces of the split fins are in abutment with the end faces of the second sub connecting pipes, and the second sub connecting pipes are positioned in the axial direction.

[0023] Further, the connecting pipe assembly further includes a first sub connecting pipe;Both ends of the first sub connecting pipe are respectively and insulatingly and sealingly connected with the channels on the two polar terminals of the outermost single battery in the large capacity battery;The first sub connecting pipe realizes the series connection of the two first heat exchange channels.

[0024] Further, the large capacity battery further includes a shell;Multiple single batteries are arranged in the inner cavity of the shell along the same direction;The shell is provided with at least one shared chamber, and the inner cavity of the shared chamber and the inner cavities of all the single batteries are communicated;The top plate of the shell is provided with a relief hole corresponding to the polar terminal of each single battery;The polar terminal of each single battery extends out of the relief hole, and the region of the top plate of the shell corresponding to the relief hole is fixedly and sealingly connected with the shell body of the single battery.

[0025] Further, the top plate of the shell is provided with an insulating sealing adhesive layer, the main part of the heat exchange channel is located in the insulating sealing adhesive layer, and the liquid inlet end and the liquid outlet end of the heat exchange channel extend out of the insulating sealing adhesive layer.

[0026] Further, the large-capacity battery described above further comprises an electric connector assembly connected with the electric connection part of each polarity terminal; and the connection part of each polarity terminal is located in the insulating sealing glue layer.

[0027] The utility model discloses beneficial effect is:

[0028] The utility model discloses the channel is set up on the monomer battery polarity terminal, as the heat exchange medium flow circulation channel, that is, the partial structure (channel inner wall) of polarity terminal is directly contacted with heat exchange medium, utilize this kind of monomer battery to build the large-capacity battery, and the monomer battery channel is connected based on the connecting pipe assembly intercommunication, forms the heat exchange channel.

[0029] Compared with the scheme of Chinese patent CN118299714A, first, the heat exchange path is shortened, and the heat exchange path is shortened from "heat exchange medium-heat exchange part-polarity terminal" to "heat exchange medium-polarity terminal", and the heat exchange medium directly acts on the polarity terminal, so that the utilization efficiency of the heat exchange medium can be improved, and the heat exchange efficiency of the large-capacity battery can be improved. In addition, since the heat exchange is direct, the channel cross-sectional area does not need to be too large, and the conductivity of the polarity terminal is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structure schematic view of a large-capacity battery in the background art;

[0031] Figure 2 It is a structure schematic view of another large-capacity battery in the background art;

[0032] Figure 3 It is a structure schematic view of the upper cover assembly in embodiment 1;

[0033] Figure 4 It is a sectional view of the upper cover assembly in embodiment 1;

[0034] Figure 5 It is a structure schematic view of another upper cover assembly in embodiment 1;

[0035] Figure 6 It is a structure schematic view of the monomer battery in embodiment 2;

[0036] Figure 7 It is a structure schematic view of another monomer battery in embodiment 2;

[0037] Figure 8 It is a structure schematic view of the large-capacity battery in embodiment 3;

[0038] Figure 9 It is a partial sectional view of the large-capacity battery in embodiment 3;

[0039] Figure 10Figure 2 is a partial exploded view of a large capacity battery of Example 3;

[0040] Figure 11 Figure 3 is a partial cross-sectional view of another large capacity battery of Example 3;

[0041] Figure 12 Figure 4 is a structural schematic view of a large capacity battery of Example 4;

[0042] Figure 13 Figure 5 is a cross-sectional view of a large capacity battery of Example 4;

[0043] Figure 14 Figure 6 is a structural schematic view of a large capacity battery of Example 5;

[0044] Figure 15 Figure 7 is a cross-sectional view of a large capacity battery of Example 5;

[0045] Figure 16 Figure 8 is an exploded schematic view of a large capacity battery of Example 5;

[0046] Figure 17 Figure 9 is a schematic view of an outer cylinder structure of a large capacity battery of Example 5;

[0047] Reference numerals in the drawings are:

[0048] 01, heat exchange member;

[0049] 1, outer shell; 11, outer shell top plate; 12, outer shell bottom plate; 13, outer cylinder; 131, outer cylinder side plate; 132, outer cylinder top plate; 14, end plate; 15, sealing connecting member; 2, single battery; 21, polarity terminal; 211, electrical connecting component; 22, passage; 23, upper cover assembly; 24, upper cover plate; 25, partitioning rib plate; 26, cylinder; 27, lower cover assembly; 28, opening member; 3, connecting pipe assembly; 31, first sub connecting pipe; 32, second sub connecting pipe; 33, third sub connecting pipe; 4, electrolyte sharing chamber; 5, gas sharing chamber; 6, avoiding hole; 7, insulating sealing adhesive layer; 8, first heat exchange passage; 9, support member; 10, boss. DETAILED DESCRIPTION

[0050] In order to make the above objectives, features and advantages of the present application more apparent, more understandable and easier to be understood, the specific embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work should belong to the protection scope of the present application.

[0051] Many specific details are set forth in the following description in order to provide a thorough understanding of the present application. However, the present application can be practiced according to other embodiments that can not be described in detail herein, and the skilled person can make similar generalizations without departing from the scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0052] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "top, bottom" and the like in the description is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first, second, third, etc." are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0053] Embodiment 1

[0054] The present embodiment is an upper cover assembly 23, which has a structure as shown in Figure 3 and Figure 4 , comprising an upper cover plate 24 and two polar terminals 21 located on the upper cover plate 24, the polarities of the two polar terminals 21 are opposite, and they are respectively used as the positive and negative polarity terminals of the single battery 2. The polar terminal 21 described herein can be a single battery 2 pole, and when the height of the single battery 2 pole does not meet the set requirements, a pole adapter can also be connected to the single battery 2 pole, and the overall structure of the single battery 2 pole and the pole adapter is used as the single battery 2 polarity terminal 21. As can be seen from Figure 3 and Figure 4 , the polar terminal 21 of the present embodiment is a single battery 2 pole, which has a higher height compared to the conventional single battery 2 pole.

[0055] The upper cover plate 24 is used to enclose the single battery 2 lower cover assembly 27 and the cylinder 26 to form the outer shell of the single battery 2.

[0056] It should be noted that the polar terminal 21 and the upper cover plate 24 are kept insulated, and the insulation can be achieved by pouring insulating glue or setting an insulating sleeve.

[0057] As can be seen from Figure 3 and Figure 4 , the present embodiment has a channel 22 passing through the two polar terminals 21, and the inner cavity of the channel 22 is directly used as the flow cavity of the heat exchange medium, so that the heat exchange medium directly contacts the polar terminal 21, improving the heat exchange efficiency.

[0058] The central axis of the channel 22 is parallel to the plane of the upper cover plate 24 in this embodiment, and in other embodiments, the extension of the central axis of the channel 22 can have an included angle with the upper cover plate 24, which is not equal to 90°.

[0059] The shape of the polar terminal 21 is not limited in the utility model, and the cross section thereof can be square, circular or the like. In addition, the utility model does not limit the cross section of the channel 22, and the channel with a relatively regular structure such as a circular or square cross section can be generally used.

[0060] In addition, the cross section area of the channel 22 in this embodiment is not too large, provided that the conductivity of the polar terminal 21 is not affected; and the cross section area of the channel 22 is not too small, so that the heat exchange area is too small and the heat exchange effect is affected. The cross section area of the channel 22 can be increased as much as possible to increase the heat exchange area and improve the heat exchange effect, provided that the conductivity of the polar terminal 21 is not affected.

[0061] As shown in Figure 5 , in order to further optimize the heat exchange effect, four partition rib plates 25 can be arranged in the channel 22 in this embodiment, the four partition rib plates 25 are uniformly distributed along the circumferential direction of the channel 22, and each partition rib plate 25 extends along the axial direction of the channel 22; based on the four partition rib plates 25, the contact area between the heat exchange medium and the polar terminal 21 can be increased, that is, the heat exchange area is increased, and thus the heat exchange effect can be effectively improved.

[0062] In other embodiments, the number and arrangement of the partition rib plates 25 can be adjusted according to the size of the channel, provided that the heat exchange medium flows through.

[0063] Embodiment 2

[0064] This embodiment is a single battery 2, and the structure thereof is shown in Figure 6 and Figure 7 , which comprises an outer shell, an electrode assembly and an electrolyte in the outer shell; wherein the outer shell is enclosed by a cylinder 26, a lower cover assembly 27 and the upper cover assembly 23 in embodiment 1. Figure 6 The single battery shown in Figure 3 adopts the upper cover assembly shown in Figure 7 . The single battery shown in Figure 5 adopts the upper cover assembly shown in

[0065] The lower cover assembly 27 of the embodiment includes a lower cover plate and a package opening part 28 arranged on the lower cover plate. Such a package opening part 28 can be separated from the lower cover plate of the single battery 2 under the action of an external force or electrolyte and form a through hole in the lower cover plate to the inner cavity of the outer shell. The package opening part 28 adopts an existing structure, for example, the package opening part 28 disclosed in Chinese Patent CN221327991U, the sealing device disclosed in Chinese Patent CN117476997A, and the package opening device disclosed in Chinese Patent CN117477117A.

[0066] In addition, a similar package opening part 28 can also be arranged on the upper cover plate 24, which is located between the two polarity terminals 21.

[0067] Embodiment 3

[0068] The embodiment is a large-capacity battery, and the specific structure is shown in Figure 8 and Figure 9 , which are a structural schematic diagram and a partial sectional view of the large-capacity battery of the embodiment, respectively. Figure 8 and Figure 9 .

[0069] As can be seen from the drawings, the large-capacity battery of the embodiment includes a connecting pipe assembly 3 and 12 single batteries 2 arranged in the same direction. The single battery 2 is the single battery 2 described in Embodiment 2. In other embodiments, the number of single batteries 2 can be adjusted according to actual needs, and the form of the single battery 2 can also be adjusted according to actual needs.

[0070] For ease of description, the arrangement direction of the single battery 2 is defined as the x direction, the height direction of the single battery 2 is defined as the z direction, and the direction perpendicular to the x direction and the z direction is defined as the y direction.

[0071] The connecting pipe assembly 3 of the embodiment connects the channels 22 on the polarity terminals 21 of all single batteries 2 in the large-capacity battery to form a heat exchange channel. A heat exchange medium is introduced into the heat exchange channel to achieve heat dissipation or heating of the large-capacity battery. When the temperature of the large-capacity battery is higher than a set threshold, a heat exchange medium with a lower temperature is introduced into the heat exchange channel to cool the large-capacity battery. When the temperature of the large-capacity battery is lower than a set threshold, a heat exchange medium with a higher temperature is introduced into the heat exchange channel to heat the large-capacity battery. By controlling the temperature of the heat exchange medium, the large-capacity battery can always operate at a normal working temperature.

[0072] In combination with Figure 8 , Figure 9 and Figure 10 .As can be seen, the connecting pipe assembly 3 of the embodiment comprises a first sub-connecting pipe 31 and a plurality of second sub-connecting pipes 32; the two ends of each second sub-connecting pipe 32 are connected with the passage 22 of the polar terminal 21 of the adjacent single battery 2 on the same side, and two first heat exchange channels 8 are formed at the top of the large-capacity battery, and the passage 22 of the two polar terminals 21 of one of the outermost single batteries 2 is connected by the second sub-connecting pipe 32, that is, the two first heat exchange channels 8 are connected in series, and a U-shaped heat exchange channel is formed at the top of the large-capacity battery, and the two ports of the U-shaped heat exchange channel are respectively used as the liquid inlet end and the liquid outlet end and are connected with the outlet and the inlet of the heat exchange medium source.

[0073] As shown in Figure 11 , for the large-capacity battery constructed by the single battery shown in Figure 7 , the end face of the second sub-connecting pipe 32 abuts against the end face of the partitioning rib plate 25 in the passage 22, and the partitioning rib plate 25 can not only increase the contact area of the heat exchange medium and the polar terminal 21, but also limit the second sub-connecting pipe 32 in the axial direction (x direction), thereby further improving the stability of the second sub-connecting pipe 32 in the passage 22.

[0074] The free ends of the two polar terminals 21 of the two outermost single batteries 2 (the free ends herein refer to the ports of the passage 22 which are not connected with the second sub-connecting pipe 32) can be directly used as the two ports (i.e., the liquid inlet end and the liquid outlet end) of the U-shaped heat exchange channel and are connected with the outlet and the inlet of the heat exchange medium source through external pipelines.

[0075] In order to facilitate the connection with the external pipeline, the third sub-connecting pipe 33 can be connected with the free ends of the polar terminal 21 passages 22 which are used as the liquid inlet end and the liquid outlet end in the embodiment, and the third sub-connecting pipe 33 is connected with the external pipeline, as shown in Figure 8 and Figure 10 .

[0076] In other embodiments, the two first heat exchange channels 8 can be connected in parallel, that is, the ports of the two first heat exchange channels 8 on one side are used for connecting with the outlet of the heat exchange medium source and are used as the liquid inlet end, and the ports of the two first heat exchange channels 8 on the other side are connected with the inlet of the heat exchange medium source and are used as the liquid outlet end.

[0077] It should be noted that:

[0078] 1. Since the polar terminal 21 of the utility model directly contacts with the heat exchange medium, the ideal heat exchange medium should have good insulation, high specific heat capacity and thermal conductivity, good flame retardant performance, low cost, suitable working temperature, long service life, no corrosion and other characteristics. In the utility model, the heat exchange medium is an insulation heat exchange medium commonly used in the prior art, which can be but is not limited to insulation oil and fluorinated liquid.

[0079] 2. Since the connecting tube assembly 3 is in direct contact with the polarity terminal 21, if the polarity terminals 21 of the same single battery 2 are electrically connected through the connecting tube assembly 3, a short circuit will occur. Figure 8 In the structure shown (two first heat exchange channels 8 are connected in series), the first sub-connecting pipe 31 and the two polarity terminals 21 to which it is connected must be insulated;

[0080] Insulation can usually be achieved in the following ways:

[0081] 2.1. Select the first sub-connecting pipe 31 made of insulating material;

[0082] 2.2. If the first sub-connecting tube 31 is made of a non-insulating material, the wall of the first sub-connecting tube 31 may be insulated, for example, by spraying insulating paint or wrapping it with an insulating film. The inner wall where the channel 22 connects to the first sub-connecting tube 31 may also be insulated, for example, by spraying insulating paint. An insulating sleeve may also be provided between the first sub-connecting tube 31 and the channel 22. Of course, for safety reasons, the above methods may be combined to adopt multiple insulation methods to achieve insulation between the first sub-connecting tube of the channel 22 and the polarity terminal 21.

[0083] In this embodiment, the first sub-connecting tube 31 is made of an insulating material to achieve insulation between the first sub-connecting tube 31 and the polarity terminal 21 .

[0084] In addition, since the heat exchange medium flows in the heat exchange channel, the sealing of the entire heat exchange channel is particularly important. In order to ensure the sealing of the heat exchange channel, Figure 9 It can be seen that the first sub-connecting pipe 31, the second sub-connecting pipe 32 and the third sub-connecting pipe 33 ( Figure 9 This is a partial cross-sectional view, not showing the third sub-connecting pipe 33) being sealed and connected to the corresponding port of the channel 22 in an interference fit manner.

[0085] In other embodiments, a sealing ring may be added between the two to further improve the sealing performance of the connection portion.

[0086] In some other embodiments, threaded sealing connection may be used to achieve sealed connection between the first sub-connecting pipe 31 , the second sub-connecting pipe 32 and the third sub-connecting pipe 33 and the ports of the corresponding channel 22 .

[0087] In the assembly, the two ends of the second sub-connection pipe 32 are respectively inserted into the two ports of the adjacent single battery 2 polarity terminal 21 channel 22. When the second sub-connection pipe 32 adopts a pipe segment of hard material, it is required that the channels 22 on the adjacent single battery 2 polarity terminal 21 must be coaxial to achieve effective connection. However, in some cases, due to the existence of processing errors, it is difficult to guarantee the coaxiality of the channels 22 on the adjacent single battery 2 polarity terminal 21, therefore, the non-connection part of the second sub-connection pipe 32 (here, the non-connection part refers to the part of the second sub-connection pipe 32 that is not connected with the port of the channel 22, and can also be understood as the middle segment of the second sub-connection pipe 32) is preferably flexible, based on the deformation of the second sub-connection pipe 32, overcoming the above-mentioned processing errors, facilitating the sealed connection of the second sub-connection pipe 32 with the port of the corresponding channel 22.

[0088] In addition, when the opening element 28 is provided on the lower cover plate assembly of each single battery 2, the present embodiment can also be provided with an electrolyte sharing chamber 4 at the bottom of the large-capacity battery, which connects the electrolyte regions of the cavities of all single batteries 2, achieving the effect of electrolyte sharing. The electrolyte sharing chamber 4 can be a hollow member provided at the bottom of the large-capacity battery, and a through hole is formed in the hollow member. Based on the through hole and the through hole formed after the opening element 28 is separated from the lower cover plate, electrolyte sharing is achieved.

[0089] When the opening element 28 is provided on the upper cover plate 24 assembly of each single battery 2, a gas sharing chamber 5 can also be provided at the top of the large-capacity battery, which connects the gas regions of the cavities of all single batteries 2, achieving the effect of gas balance. The gas sharing chamber 5 can also cover the top of each single battery 2 in the large-capacity battery, and a venting membrane is provided at the venting or explosion-proof port. When the venting membrane at the gas port of any single battery 2 is broken by the internal cavity smoke, the internal cavity of the single battery 2 is connected with the gas sharing chamber 5, and the internal smoke is discharged through the gas sharing chamber 5, improving the safety of the large-capacity battery.

[0090] The specific structures of the electrolyte sharing chamber 4 and the gas sharing chamber 5 can be referred to the first hollow member and the second hollow member described in Chinese Patent CN117477186A, and the electrolyte sharing channel 22 described in CN115275453A.

[0091] Embodiment 4

[0092] The difference between the structure of the large-capacity battery in this embodiment and that in Embodiment 3 is that the large-capacity battery in this embodiment also has a shell 1, and the specific structure is as shown in Figure 12 and Figure 13 .

[0093] From Figure 12 and Figure 13As can be seen, the embodiment adds the shell 1 to the large-capacity battery of Embodiment 3, arranges each single battery 2 in the inner cavity of the shell 1, and opens the avoiding hole 6 in the shell top plate 11 to enable the polarity terminal 21 of each single battery 2 to extend out. The polarity terminal 21 of each single battery 2 extends out of the corresponding avoiding hole 6, and a sealing connecting piece 15 is added between the avoiding hole 6 and the polarity terminal 21 to realize the fixed sealing of the area of the shell top plate 11 corresponding to the avoiding hole 6 and the shell of the single battery 2.

[0094] The sealing connecting piece 15 includes a hollow member; the bottom of the hollow member is used for sealing connection with the first area of the single battery 2, and the top of the hollow member is sealingly connected with the second area of the shell top plate 11; wherein the first area is the area around any polarity terminal 21 on the upper cover plate 24 of any single battery 2; wherein the area around the polarity terminal 21 is the area around the insulating sealing gasket on the polarity terminal 21. The insulating sealing gasket is a part for insulating the polarity terminal 21 and the upper cover plate 24 of the single battery 2. The second area is the area of the shell top plate 11 corresponding to any one avoiding hole 6 of the shell top plate 11. The area of the shell top plate 11 corresponding to the avoiding hole 6 is the peripheral area of the shell top plate 11 corresponding to any one avoiding hole 6 on the outer surface of the shell top plate 11; or the area of the shell top plate 11 corresponding to the avoiding hole 6 is the hole wall of the avoiding hole 6.

[0095] A support 9 extending along the x direction is arranged between the shell bottom plate 12 and each single battery 2 to form a liquid passage between each single battery and the shell bottom plate as an electrolyte sharing chamber 4.

[0096] Figure 12 And Figure 13 In the shell top plate 11, a boss 10 extending along the x direction is arranged, and a gas passage is opened in the boss 10, which penetrates the inner cavity of the shell 1 and communicates with the gas area in the inner cavity of each single battery 2 as a gas sharing chamber 5. When the inner cavity of the single battery 2 produces gas, the inner cavity of the gas passage can also serve as a gas containing chamber to relieve the problem of swelling of the shell 1 caused by gas production.

[0097] In other embodiments, only the electrolyte sharing chamber 4 or the gas sharing chamber 5 can be provided.

[0098] Embodiment 5

[0099] This embodiment is another large-capacity battery, which is different from Embodiment 4 in that an insulating sealing adhesive layer 7 is laid on the top of the large-capacity battery of Embodiment 4.

[0100] The specific structure is as follows Figure 14 And Figure 15As shown, the insulating sealant layer 7 covers the top of the large-capacity battery, the main part of the heat exchange channel (which can be understood as including each first sub-connection pipe and the channel on each polarity terminal) is located in the insulating sealant layer, and the liquid inlet end and the liquid outlet end of the heat exchange channel are exposed from the insulating sealant layer 7, which is convenient for connection with the heat exchange medium source. At the same time, the insulating sealant layer 7 also fills the space between the polarity terminal 21 and the sealing connector 15.

[0101] In this embodiment, the electrical connection part of all the polarity terminals 21 extends out of the insulating sealant layer 7, so as to be convenient for connection with the electrical connector assembly (which is an electrical connector for realizing parallel connection of each single battery 2 in the large-capacity battery and / or series connection of adjacent large-capacity batteries).

[0102] Laying the insulating sealant layer 7 on the top of the large-capacity battery has at least the following advantages:

[0103] I. Further improving the sealing performance of the heat exchange channel;

[0104] Specifically, the insulating sealant constituting the insulating sealant layer 7 penetrates into the tiny gap between the two ports of the channel 22 and the connection pipe assembly 3 (including the first sub-connection pipe, the second sub-connection pipe and the third sub-connection pipe), so as to further seal the gap in the radial direction;

[0105] II. Secondary sealing of the avoidance hole 6 part;

[0106] Even if there is a tiny gap (which does not allow the insulating sealant to pass through) between the sealing connector 15 and the shell of the single battery 2 and the top plate 11 of the shell, filling the insulating sealant in the space between the polarity terminal 21 and the sealing connector 15 can also seal such tiny gap, so as to further improve the sealing performance of the avoidance hole 6 part;

[0107] III. Anti-condensation;

[0108] During long-term use, due to the temperature difference between the inside and outside of the second sub-connection pipe 32, condensation will be generated on the surface. When the condensation accumulates to a certain amount, it may cause a short circuit problem. The second sub-connection pipe 32 is wrapped by the insulating sealant layer 7, and when condensation is generated on the surface of the second sub-connection pipe 32, it can prevent the battery from short circuiting under the protection of the insulating sealant layer 7;

[0109] In some other embodiments, the electric connection assembly can be connected with the polarity terminal 21, and then the insulating sealant layer 7 is laid on the top of the large capacity battery, that is, the insulating sealant layer 7 completely covers the polarity terminal 21 of the single battery 2 and the connection position of the electric connection assembly and the polarity terminal 21; in the whole large capacity battery, only the free end of the electric connection assembly (for realizing the series connection of the large capacity battery) is exposed and charged after the shell 1 is insulated, and the rest is insulated, so that such a large capacity battery has higher safety performance.

[0110] In order to prevent the overflow problem in the glue injection process, the partial structure of the shell 1 is used as a glue blocking plate in the embodiment, and the shell 1 is exploded into two open-ended outer cylinder bodies 13 and end plates 14 covering the open ends of the outer cylinder bodies 13. Figure 16 and Figure 17 The structure of the shell 1 of the embodiment is described in detail.

[0111] As shown in Figure 16 , it is an exploded structure diagram of the shell 1 of the embodiment, and the shell 1 is exploded into two open-ended outer cylinder bodies 13 and end plates 14 covering the open ends of the outer cylinder bodies 13. The structure of the outer cylinder body 13 is shown in Figure 17 , both ends of the outer cylinder body 13 are open, that is, the open ends of the outer cylinder body 13 are parallel to the yz plane; in the z direction, the height of the outer cylinder side plate 131 is higher than the height of the outer cylinder top plate 132; the part of the outer cylinder side plate 131 higher than the outer cylinder top plate 132 is used as a glue blocking plate. The outer cylinder body 13 can be integrally formed by aluminum extrusion process, which is convenient to process, and has good sealing property compared with the split structure.

Claims

1. An upper cover assembly characterized by: The upper cover plate and the polar terminal are provided on the upper cover plate; a channel is formed on the polar terminal and penetrates the polar terminal, and the inner cavity of the channel is used as a heat exchange medium flow channel; and the inner wall of the channel is used for direct contact with the heat exchange medium.

2. The overcap assembly of claim 1, wherein: The inner wall of the channel is provided with a split rib plate for increasing the heat exchange area.

3. The overcap assembly of claim 2, wherein: The split rib plate is in the form of a plurality of strips, and the plurality of strips are uniformly distributed in the circumferential direction of the channel, and each strip extends in the axial direction of the channel.

4. The overcap assembly of any one of claims 1 to 3, wherein: The upper cover plate is further provided with an opening element.

5. A single cell, characterized by: The electrode assembly and the electrolyte are located in the outer shell; the outer shell is enclosed by the upper cover assembly, the cylinder and the lower cover assembly; and the upper cover assembly is the upper cover assembly according to any one of claims 1 to 4.

6. The cell according to claim 5, wherein: The lower cover assembly is provided with an opening element.

7. A high capacity battery characterized by: The connection pipe assembly and a plurality of single batteries according to claim 5 or 6 arranged in the same direction are included. The connection pipe assembly connects the channels on the polar terminals of the single batteries to form a heat exchange channel.

8. The battery of claim 7, wherein: The connection pipe assembly includes a plurality of second sub-connection pipes. The two ends of each second sub-connection pipe are respectively and sealingly connected to the channels on the polar terminals of the adjacent single batteries on the same side, thereby forming two first heat exchange channels at the top of the large-capacity battery.

9. The battery of claim 8, wherein: The connection pipe assembly further includes a first sub-connection pipe. The two ends of the first sub-connection pipe are respectively and insulatingly sealingly connected to the channels on the two polar terminals of the outermost single battery in the large-capacity battery.

10. The battery of any one of claims 7 to 9, wherein: The outer shell is further provided with a plurality of single batteries arranged in the same direction in the inner cavity of the outer shell. The outer shell is provided with at least one shared chamber, and the inner cavity of the shared chamber and the inner cavities of all the single batteries are connected. The polar terminals of each single battery extend out of the avoiding hole, and the area of the top plate of the outer shell corresponding to the avoiding hole is fixedly and sealingly connected to the shell of the single battery.

11. The battery of claim 10, wherein: An insulating sealing adhesive layer is provided on the top plate of the outer shell, and the main part of the heat exchange channel is located in the insulating sealing adhesive layer, and the liquid inlet end and the liquid outlet end of the heat exchange channel extend out of the insulating sealing adhesive layer.

12. The battery of claim 11, wherein: The electric connection component assembly is connected to the electric connection part of each polar terminal, and the connection part of each polar terminal is located in the insulating sealing adhesive layer.

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