CN221885196U - A large capacity battery - Google Patents

Abstract

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery. The technical problem of poor heat dissipation performance of the existing high-capacity battery is solved. Comprises a shell, a plurality of single batteries and a heat transfer tube; the plurality of single batteries are arranged in the shell along the same direction; the shell is provided with a sharing cavity, and the inner cavity of the sharing cavity is communicated with the inner cavities of all the single batteries; the shell top plate is provided with avoidance holes corresponding to the polarity terminals of the single batteries; each single battery polar terminal extends out of the avoidance hole, and the shell top plate area corresponding to the avoidance hole is fixedly sealed with the single battery shell; the part of each single battery polar terminal extending out of the avoiding hole is provided with a heat transfer tube clamping part; the heat transfer tube is fixed on the heat transfer tube clamping part, the inner cavity of the heat transfer tube is used for transmitting a heat transfer medium, and the heat transfer tube is insulated from each single battery. The heat transfer pipe is in direct contact with each single battery, so that balanced heat dissipation of each single battery in the high-capacity battery is realized.

Description

High-capacity battery

Technical Field

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery.

Background

In the market, a plurality of single batteries are connected in parallel or in series to form a large-capacity battery (also called a battery module or a battery pack).

However, in the existing large-capacity battery, each single battery has a difference, and due to the existence of the barrel effect, the single battery with the worst performance is often affected, so that the upper limit of the capacity and the cycle number of the whole large-capacity battery are extremely limited. Therefore, how to improve the uniformity of each single battery in the large-capacity battery becomes an important point and a difficult point of research in the field.

In order to solve the above problems, chinese patent CN220324596U discloses a high-capacity battery, whose structure is shown in fig. 1, wherein the high-capacity battery comprises a housing and a plurality of unit batteries 2, and the plurality of unit batteries 2 are sequentially connected in parallel and are arranged in the inner cavity of the housing; the bottom plate 14 of the shell is provided with an electrolyte sharing chamber 3, and the electrolyte sharing chamber 3 is communicated with electrolyte areas in the inner cavities of the single batteries 2; the top plate 13 of the shell is provided with avoiding holes 6 which can enable the pole posts of each single battery 2 to extend out; the poles of each single battery 2 extend out of the avoidance holes 6, and the shell area corresponding to the avoidance holes 6 is fixedly sealed with the shell of the single battery 2. The electrolyte in the inner cavities of the single batteries 2 is communicated through the electrolyte sharing chamber 3, so that the electrolytes of all the single batteries 2 are in the same system, the difference between the electrolytes of the single batteries 2 is reduced, the consistency between the single batteries 2 is improved to a certain extent, and the cycle life of the high-capacity battery is prolonged to a certain extent.

The high-capacity battery can emit heat in the use process, if the heat is not emitted timely, the service life of the battery is greatly shortened, the energy loss is increased, even potential safety hazards such as spontaneous combustion and ignition occur, and therefore the heat-emitting efficiency of the high-capacity battery is particularly important.

Disclosure of utility model

The utility model aims to provide a high-capacity battery, which solves the technical problem that the heat dissipation performance of the existing high-capacity battery is poor.

The technical scheme of the utility model is a high-capacity battery, which is characterized in that: comprises a shell, a plurality of single batteries and a heat transfer tube; the plurality of single batteries are arranged in the shell along the same direction;

the shell is provided with a sharing cavity, and the inner cavity of the sharing cavity is communicated with the inner cavities of all the single batteries;

The shell top plate is provided with avoidance holes corresponding to the polarity terminals of the single batteries; each single battery polar terminal extends out of the avoidance hole, and the shell top plate area corresponding to the avoidance hole is fixedly sealed with the single battery shell;

The part of each single battery polar terminal extending out of the avoiding hole is provided with a heat transfer tube clamping part;

the heat transfer tube is fixed on the heat transfer tube clamping part of each single battery polar terminal, the inner cavity of the heat transfer tube is used for transmitting heat transfer medium, and the heat transfer tube is insulated from each single battery.

According to the utility model, the heat transfer pipe is fixed at the position of the polarity terminal of each single battery extending out of the avoidance hole, the heat transfer pipe is in direct contact with each single battery, and the heat is timely guided out based on a primary heat exchange mode, so that the heat dissipation mode realizes balanced heat dissipation of each single battery in the high-capacity battery, and the use safety of the high-capacity battery is improved.

Further, the heat transfer tube clamping part is a through groove or a through hole formed in the position, extending out of the avoidance hole, of each single battery polar terminal.

Further, the single battery polar terminal is a columnar body and comprises a first end face, a second end face and a side wall; the first end face is used for being electrically connected with the electrode assembly; the second end face is used as an electric connection part; the through grooves or the through holes are formed in the side walls, so that the heat transfer pipe and the polar terminals have larger contact area, and the heat transfer efficiency is further improved.

Further, in order to facilitate the installation, the heat transfer tube is a split piece and comprises a first tube, a second tube and a connecting tube;

The first tube is fixed in a positive terminal through groove of each single battery in the large-capacity battery; the second pipe is fixed in a negative terminal through groove of each single battery in the large-capacity battery;

The two ends of the connecting pipe are respectively connected with the ports of the first pipe and the second pipe which are positioned on the same side.

Further, in order to ensure insulation between the heat transfer tube unit and the battery module, the present utility model adopts the following three schemes:

Scheme one: the first pipe and the second pipe are aluminum pipes, the pipe wall of each aluminum pipe is provided with an oxide layer, and an insulating sleeve is sleeved on the aluminum pipe with the oxide layer;

Scheme II: the first pipe and the second pipe are aluminum pipes, and insulating sleeves are sleeved on the aluminum pipes;

Scheme III: the first pipe and the second pipe are aluminum pipes, and the pipe walls of the aluminum pipes are provided with oxide layers;

above-mentioned scheme one adopts two-layer insulation, ensures the reliability of insulation, and for scheme one, scheme two and scheme three structure are comparatively simple, but the insulating reliability is lower.

Further, an insulating sealant layer is paved on the top plate of the shell; the second end face of each single battery polar terminal extends out of the insulating sealing glue layer, and the liquid inlet end and the liquid outlet end of the heat transfer tube extend out of the insulating sealing glue layer. Through to the shell top board lay insulating seal glue film (polar terminal and dodge the clearance between the hole and also have insulating seal glue film), heat transfer tube surface produces the condensation on the polar terminal when fixing, under insulating seal glue film's the stop, the unable infiltration polar terminal of condensation dodges the clearance between the hole, and then can prevent the condition emergence of battery short circuit. In addition, after the insulating sealant layer is paved, the top of the whole large-capacity battery can be flat.

Further, the high-capacity battery further comprises two first electric connecting pieces;

One of the first electric connectors is connected with the second end faces of the positive polarity terminals of all the single batteries in the large-capacity battery; the other first electric connector is connected with the second end faces of the negative terminals of all the single batteries in the large-capacity battery.

Further, the above-mentioned large-capacity battery, characterized in that: the battery pack also comprises an insulating protective cover, wherein the insulating protective cover is arranged at the top of the shell of the high-capacity battery, and each single battery polarity terminal is positioned in the insulating protective cover;

Defining the length direction of the shell as the x direction, the width direction as the y direction and the height direction as the z direction;

The side wall of the insulating protective cover, which is parallel to the yz plane, is provided with a channel for extending out the liquid inlet end and the liquid outlet end of the heat transfer pipe;

Slits are formed in two side walls of the insulating protective cover, which are parallel to the xz plane, and the electric connection parts of the polarity terminals of the single batteries are connected with the second electric connection piece through the slits.

According to the utility model, the insulation protection cover is used for providing insulation protection for the polar terminal, so that potential safety hazards possibly existing in the process of exposing the polar terminal in the operation process of the high-capacity battery are avoided, the problem that the high-capacity battery is short-circuited due to the fact that some foreign matters in the external environment fall into the position of the polar terminal is also avoided, and the safety of the high-capacity battery is improved.

Further, the sharing chamber is an electrolyte sharing chamber and is a liquid channel positioned on the bottom plate of the shell, and the liquid channel is communicated with the electrolyte areas in the inner cavities of the single batteries. The electrolyte sharing chamber is communicated with electrolyte areas of the inner cavities of all the single batteries in the shell, so that the consistency of all the single batteries is ensured by sharing the electrolyte of all the single batteries, and the cycle life of the high-capacity battery is prolonged to a certain extent.

Further, a bottom support is arranged between the bottom plate of the shell and each single battery; the bottom support piece comprises a flat plate, at least two first support ribs extending along the x direction are arranged on the upper surface of the flat plate, each single battery is supported on the first support ribs, and a liquid channel is formed between adjacent first support ribs and used as an electrolyte sharing chamber; the lower surface of the flat plate is provided with a second supporting rib extending along the x direction and is in direct contact with the bottom plate of the shell.

Further, the sharing chamber is a gas sharing chamber, and is a gas channel positioned on the top plate of the shell, and the gas channel is communicated with the gas area of each single battery inner cavity. The gas sharing chamber is communicated with the gas areas of the inner cavities of the single batteries in the shell, so that the gas of the single batteries is balanced, the consistency among the single batteries is improved to a certain extent, and the cycle life of the high-capacity battery is prolonged to a certain extent.

The beneficial effects of the utility model are as follows:

1. According to the utility model, the heat transfer pipe is fixed at the part of each single battery polarity terminal extending out of the avoidance hole, and the heat transfer pipe is in direct contact with each single battery polarity terminal, so that the heat of the single battery polarity terminal is timely led out, the balanced heat dissipation of each single battery in the large-capacity battery is realized, and the use safety of the large-capacity battery is improved.

2. The aluminum material is used as the main material of the heat transfer tube, so that the heat transfer tube has higher heat transfer efficiency; in addition, when the heat pipe is used as the heat exchange pipe, the heat exchange efficiency is high, but the length of the heat pipe is limited, and the use scene is limited, so that the heat exchange piece is only suitable for the conditions that single batteries in a large-capacity battery are fewer and the large-capacity battery in the energy storage device is fewer. Compared with the heat pipe, the aluminum pipe can be customized according to the length of actual requirements, water is used as a heat transfer medium through insulating treatment on the aluminum pipe, primary heat transfer is achieved, and the heat pipe is applicable to large-capacity batteries with more single batteries and energy storage equipment with more large-capacity batteries. Simultaneously, an insulating layer and an insulating sleeve are arranged on the aluminum pipe at the same time to form a double-insulating structure; this kind of double insulation's setting for when heat transfer pipe and battery cell carried out the heat exchange, even one in insulating layer or the insulating cover produced the damage, still can keep the insulating properties of reliability between heat transfer pipe and the battery cell, and then promoted the security of battery cell in the use.

3. In order to overcome the problem that condensation is generated on the surface due to the temperature difference between the inside and the outside of the heat transfer tube in the long-time use process, when the condensation is gathered to a certain amount, the condensation possibly permeates into a gap between the polar terminal and the avoiding hole, so that short circuit is caused; by paving the insulating sealing glue layer on the top plate of the shell, when the insulating sealing glue layer is fixed on the surface of the heat transfer tube on the polar terminal, the insulating sealing glue layer can not permeate into the gap between the polar terminal and the avoidance hole, so that the occurrence of short circuit of the battery can be prevented.

4. According to the utility model, the insulation protection cover is used for providing insulation protection for the polar terminal, so that potential safety hazards possibly existing in the process of exposing the polar terminal in the operation process of the high-capacity battery are avoided, the problem that the high-capacity battery is short-circuited due to the fact that some foreign matters in the external environment fall into the position of the polar terminal is also avoided, and the safety of the high-capacity battery is improved.

Drawings

Fig. 1 is a schematic diagram of an explosion structure of a large-capacity battery in the background art;

Fig. 2 is a schematic view of the structure of the large-capacity battery of the present utility model;

FIG. 3 is a schematic view of a partial structure of a large-capacity battery according to the present utility model, with one side end plate removed and a heat transfer pipe;

FIG. 4 is a schematic view of a high capacity battery can according to the present utility model;

FIG. 5 is a schematic view of the structure of the high capacity battery cartridge of the present utility model with a bottom support;

FIG. 6 is a schematic view of the structure of the bottom support of the present utility model;

Fig. 7 is a schematic structural diagram of a single cell according to the present utility model;

FIG. 8 is a schematic diagram of a second embodiment of a battery cell according to the present utility model;

FIG. 9 is a schematic view of another electrolyte sharing chamber according to the present utility model;

FIG. 10 is a schematic diagram of a single cell structure according to the present utility model;

FIG. 11 is a schematic diagram of a second embodiment of a battery cell according to the present utility model;

Fig. 12 is a schematic view of a partial exploded structure of the high-capacity battery of the present utility model;

FIG. 13 is a partial exploded view of a high capacity battery of the present utility model with an insulating sealant layer laid on the top plate of the housing;

FIG. 14 is a schematic view of a high capacity battery structure with an insulating sealant layer laid on the top plate of the housing of the present utility model;

FIG. 15 is a schematic view showing the structure of a high-capacity battery with an insulating shield according to the present utility model;

FIG. 16 is a partial exploded view of a high-capacity battery having an insulating shield according to the present utility model;

The reference numerals in the drawings are:

1. A housing; 11. a cylinder; 12. an end plate; 13. a housing top plate; 14. a housing floor; 2. a single battery; 3. an electrolyte sharing chamber; 4. a gas sharing chamber; 5. a polar terminal; 52. a second end face; 53. a sidewall; 6. avoidance holes; 7. a heat transfer tube clamping part; 8. a heat transfer tube; 81. a first tube; 82. a second tube; 83. a connecting pipe; 9. a bottom support; 91. a first support rib; 911. a notch; 92. second support ribs; 10. a seal assembly; 15. an insulating protective cover; 151. an insulating frame; 152. an insulating cover plate; 153. a slit; 16. a single battery lower cover plate; 161. a first through hole; 17. an upper cover plate of the single battery; 171. a second through hole; 18. a baffle; 19. a channel; 20. an insulating sealant layer; 21. a first electrical connection; 22. and a second electrical connector.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by "top, bottom" or the like in terms are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first, second, etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model relates to a high-capacity battery, as shown in fig. 2 and 3, comprising a shell 1 and a plurality of single batteries 2; a plurality of single batteries 2 are arranged in the same direction and placed in the shell 1;

the shell 1 is provided with a shared cavity, and the inner cavity of the shared cavity is communicated with the inner cavities of all the single batteries 2;

It should be noted that:

The sharing chamber may be an electrolyte sharing chamber 3 (as shown in fig. 3), the inner cavity of the electrolyte sharing chamber 3 is communicated with the electrolyte areas in the inner cavities of all the single batteries 2, and each single battery 2 can be in a uniform electrolyte environment through the electrolyte sharing chamber 3, so that the uniformity of the electrolyte in each single battery 2 is ensured; the performance and the charge-discharge cycle life of the high-capacity battery are improved.

The sharing chamber may be a gas sharing chamber 4 (as shown in fig. 3), the inner cavity of the gas sharing chamber 4 is communicated with the gas areas in the inner cavities of all the single batteries 2, and the gas balance of each single battery 2 is realized through the gas sharing chamber 4, so that the performance and the charge-discharge cycle life of the high-capacity battery can be improved.

The sharing chamber can also be a gas-liquid sharing chamber, the inner cavity of the gas-liquid sharing chamber is communicated with the electrolyte areas and the gas areas of the inner cavities of all the single batteries 2, and each single battery 2 can be in a uniform electrolyte environment and a uniform gas environment through one gas-liquid sharing chamber, so that the performance of the high-capacity battery and the charge-discharge cycle life are improved.

According to research, in the process of charging and discharging the battery, the temperature at the position of the battery polarity terminal 5 is the highest temperature of the battery, and if the heat at the position of the battery polarity terminal 5 is processed, the battery can be effectively radiated, so that the effective temperature control of the battery can be realized.

Therefore, in order to improve the heat dissipation performance of such a large-capacity battery, as can be seen from fig. 4, the present utility model provides the housing top plate 13 with the avoiding holes 6 corresponding to the polarity terminals 5 of the individual batteries 2; the polarity terminals 5 of the single batteries 2 extend out of the corresponding avoidance holes 6, and the areas of the shell top plates 13 corresponding to the avoidance holes 6 are fixedly sealed with the shell of the single batteries 2, so that gaps between the polarity terminals 5 and the avoidance holes 6 are sealed. The part of each single battery 2, which extends out of the avoiding hole 6, is provided with a heat transfer tube clamping part 7; the heat transfer pipe 8 is fixed to the heat transfer pipe clamping portion 7. Since the heat transfer pipe 8 is in direct contact with the polar terminal 5 of the unit cell 2, insulation is required between the heat transfer pipe 8 and the unit cell 2 in order to ensure safety.

It should be noted that, the polar terminal 5 of the battery cell 2 may be a battery cell 2 polar post, and if the polar terminal 5 of the battery cell 2 is not smoothly protruded out of the avoiding hole 6, a polar post adaptor may be connected to the battery cell 2 polar post, and the overall structure of the battery cell 2 polar post and the polar post adaptor may be used as the battery cell 2 polar terminal 5.

According to the utility model, a plurality of single batteries are arranged in one shell with a sharing cavity, and the sharing cavity is communicated with the inner cavities of all the single batteries in the shell, so that the electrolyte and/or the gas of all the single batteries are shared to ensure the consistency of all the single batteries, namely, the electrolyte and/or the gas of all the single batteries are communicated, the electrolytes and/or the gas of all the single batteries are in the same system, the difference among the single batteries is reduced, the consistency among the single batteries is improved to a certain extent, and the cycle life of the large-capacity battery is improved to a certain extent.

Meanwhile, the heat transfer pipe is fixed at the position of the polarity terminal of each single battery extending out of the avoidance hole, the heat transfer pipe is in direct contact with the polarity terminal of each single battery, heat is timely led out, balanced heat dissipation of each single battery in the large-capacity battery is achieved through the heat dissipation mode, and the use safety of the large-capacity battery is improved.

The utility model will be described in detail with reference to the accompanying drawings and specific embodiments.

Example 1

As can be seen from fig. 2 and 3, the large-capacity battery of the present embodiment includes a case 1 and unit cells 2 arranged in the case 1.

In this embodiment, the unit cells 2 are square-shell cells, and the number of the unit cells is 13, and in other embodiments, the number of the unit cells can be adjusted according to actual requirements. Each of the cells 2 has an inner chamber including an electrolyte region and a gas region.

For 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 cylinder 11 having both ends open and an end plate 12 covering the open end of the cylinder 11.

In the case bottom plate 14 (cylinder bottom plate), 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 in the inner cavities of the individual cells 2.

In the case top plate 13 (cylinder top plate), a gas sharing chamber 4 is provided along the x direction, and the inner cavity of the gas sharing chamber 4 communicates with the gas area of the inner cavity of each unit cell 2.

In 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 housing 1 along the x direction, and the inner cavity of the gas-liquid sharing chamber is communicated with the electrolyte area and the gas area of the inner cavity of each single battery 2.

The electrolyte sharing chamber 3 of this embodiment is a liquid channel disposed on the bottom plate 14 of the casing, and the specific structure can be seen in fig. 4, 5 and 6:

Fig. 4 is a partial structural view of the large-capacity battery case 1 of the present embodiment, that is, a structural view of the can 11; FIG. 5 is a schematic view of the structure of the electrolyte sharing chamber 3 formed by adding a bottom support 9 to the cylinder 11 of FIG. 4; fig. 6 is a schematic view of the structure of the bottom support 9 of the present embodiment;

As can be seen from fig. 4, the left and right ends of the cylinder 11 in this embodiment are open, and can be integrally formed by an aluminum extrusion process.

In fig. 5, a bottom support 9 is fixed inside the cylinder 11, which bottom support 9 has mainly the following two functions:

1. Raising each single battery 2 so that the polar terminal 5 of each single battery 2 extends out of the avoidance hole 6 of the housing top plate 13;

2. Each unit cell 2 is supported, and a liquid channel is formed between the bottom of each unit cell 2 and the bottom of each unit cell as an electrolyte sharing chamber 3.

As can be seen in connection with fig. 3, an electrolyte-sharing chamber 3 is formed between the bottom support 9 of the present embodiment and the bottom of each unit cell 2.

As can be seen from fig. 6, the bottom support 9 of this embodiment is made of aluminum material, and its main body 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 housing. The lower surface of the flat plate is provided with a second support rib 92 extending in the x direction, and the upper surface of the flat plate is provided with a first support rib 91 extending in the x direction.

In this embodiment, two second supporting ribs 92 have a main function of raising each single battery 2, so that the polarity terminal 5 of each single battery 2 extends out of the avoidance hole 6 of the top plate 13 of the housing.

As can be seen in connection with fig. 3, the bottom support 9 is placed in the cylinder 11 between the individual cells 2 and the housing floor 14.

In the process of assembling the large-capacity battery, the port of the channel 19 formed between the bottom support member 9 and the bottom plate 14 of the housing needs to be sealed by the baffle 18 to prevent the electrolyte from flowing into the channel, so that the electrolyte consumption of the whole large-capacity battery is increased (as shown in fig. 3).

In addition, the edges of the bottom support 9 in the x-direction should be sealed against the side walls of the cylinder parallel to the xz-plane, avoiding electrolyte infiltration into the channels. Sealing of the two can be realized by adding a sealing strip or sealant; the channels can be filled with light materials, the channels are filled, the light materials are not required to react with electrolyte, solid columns made of PP materials can be selected, and compared with aluminum materials, the cost is lower. Even if there is a gap between the bottom support 9 and the side wall of the cylinder parallel to the xz plane, no excessive electrolyte will enter the channel as it has been filled.

In other embodiments, the same objective can be achieved by thickening the plate size, but with higher material costs relative to the present embodiment, the overall high capacity battery is made to have a greater dead weight. In this embodiment, the second supporting ribs 92 are provided, so that the thickness of the flat plate can be reduced as much as possible on the premise of meeting the supporting strength, the material cost is reduced, and the dead weight of the large-capacity battery is reduced.

In this embodiment, the number of the first supporting ribs 91 is three, each supporting rib extends along the x direction, and the three supporting ribs are uniformly arranged along the y direction, so that in order to improve the electrolyte sharing effect, the first supporting rib 91 in the middle is provided with notches 911, and the liquid channels on two sides of the first supporting rib are ensured to be mutually communicated.

The structure of the unit cell 2 corresponding to the electrolyte-sharing chamber 3 of such a structure is as shown in fig. 7 and 8:

In this embodiment, two first through holes 161 are formed in the lower cover plate 16 of the unit cell, and the two first through holes 161 are arranged along the y direction and are symmetrical to each other. Sealing the two first through holes 161 with the sealing assembly 10; after the unit cell 2 is mounted in the cylindrical body 11, the two first through holes 161 are located directly above the two liquid passages, respectively, and the sealing unit 10 can be detached from the lower cover plate or an opening penetrating the first through holes 161 is formed in the sealing unit 10 to penetrate the liquid passages by an external force or an external electrolyte (the external electrolyte here means an electrolyte located outside the unit cell 2).

As can be seen from fig. 7, in this embodiment, two first through holes 161 are located on two sides of the lower cover plate 16 of the battery cell, when the battery cell inside the battery cell 2 is a rolled core formed by rolling, a larger space is formed between the side wall of the thickness direction of the housing of the battery cell 2 and the rolled core, and the first through holes 161 are close to two sides of the lower cover plate 16 of the battery cell, firstly, when the first through holes 161 are formed, no influence is exerted on the internal battery cell structure, and secondly, after the sealing assembly 10 of the part is opened, the electrolyte in the inner cavity of the electrolyte sharing chamber 3 can better enter the inner cavity of the battery cell 2.

The size of the first through hole 161 needs to satisfy the following conditions:

1. The first through hole 161 cannot be too large so as to ensure that the whole single battery lower cover plate 16 has certain strength, and the single battery 2 is prevented from being scrapped due to poor strength of the single battery lower cover plate 16 before the sealing assembly 10 at the position of the first through hole 161 is opened;

2. The first through hole 161 cannot be too small, so that after the sealing assembly 10 at the position of the first through hole 161 is opened, the electrolyte areas in the inner cavities of the single batteries 2 are smoothly communicated with the inner cavities of the electrolyte sharing chambers 3, and good sharing effect is ensured.

The sealing assembly 10 in this embodiment may adopt a sealing film disclosed in chinese patent CN 218525645U; two types of sealing films are disclosed in the patent, and one type of sealing film can be dissolved in electrolyte; another type of sealing membrane can be opened by an external force.

The sealing film which can be dissolved in the electrolyte is generally required to be arranged on one side of the sealing film facing the inside of the shell of the single battery 2, and the protective film is insoluble in the electrolyte, and falls off when the sealing film is dissolved in the electrolyte.

When the sealing film is adopted, the liquid path unpacking can be carried out through the following process:

After the assembly of the large-capacity battery is completed, the sealing films at the two first through holes 161 can be automatically dissolved from the outside after the electrolyte is injected into the electrolyte sharing chamber 3; because the protective film and the lower cover plate 16 of the single battery do not adopt any fixing mode, after the sealing film is dissolved, the protective film can automatically fall off from the cover plate, so that the electrolyte sharing chamber 3 is communicated with the inner cavity of the single battery 2, the electrolytes of all the single batteries 2 are in the same system, and the electrolyte sharing effect is achieved. In this embodiment, even if the sealing film at one first through hole 161 is not completely dissolved during the unpacking process, the electrolyte sharing effect can be achieved through the other first through hole 161 (the first through hole 161 sealing film is dissolved).

The sealing film which can be opened under the action of external force is adopted, the traction ring can be arranged on the sealing film generally, and the traction ring is pulled by the external force, so that an opening is formed at the sealing film.

The liquid path unpacking can be carried out by the following steps:

After the assembly of the large-capacity battery is completed, the traction ring is pulled by the traction tool, and each sealing film is torn or falls off from the first through hole 161, so that the electrolyte sharing chamber 3 is communicated with the inner cavity of the single battery 2, the electrolytes of all the single batteries 2 are in the same system, and the electrolyte sharing effect is achieved. In the unpacking process, even if the sealing film at one first through hole 161 is not torn or peeled off, the electrolyte sharing effect can be achieved by the other first through hole 161 (the sealing film of the first through hole 161 is torn or entirely peeled off).

In other embodiments, one or more than two first through holes 161 may be formed in the lower cell cover plate 16, where one first through hole 161 is located generally in the geometric center of the lower cell cover plate 16, and where two or more than two first through holes 161 are located, each first through hole 161 may be uniformly distributed on the lower cell cover plate 16. The size of the first through hole 161 still needs to satisfy the above two conditions. Meanwhile, the position of the first supporting rib 91 needs to be adjusted according to the position of the first through hole 161 of the unit cell 2, for example, when there is one first through hole 161 and the first through hole 161 is located at the geometric center of the lower cover plate 16 of the unit cell, only two first supporting ribs 91 may be provided, and a liquid channel is formed between the two first supporting ribs 91 and is communicated with the first through hole 161 of the unit cell 2.

In other embodiments, the electrolyte sharing chamber 3 shown in fig. 9 may be further used, that is, the supporting ribs are directly disposed on the bottom plate 14 of the casing along the x direction, a liquid channel is formed between the two supporting ribs, and as the electrolyte sharing chamber 3, the supporting ribs also have the following two functions:

1. Raising each single battery 2 so that the polar terminal 5 of each single battery 2 extends out of the avoidance hole 6 of the housing top plate 13;

2. Each unit cell 2 is supported, and a liquid channel is formed between the bottom of each unit cell 2 and the bottom of each unit cell as an electrolyte sharing chamber 3.

However, compared with the present embodiment, the electrolyte sharing chamber 3 formed by the present embodiment has a larger size in the z direction, so that the electrolyte consumption of the large-capacity battery is larger, and the cost is higher.

Specifically, in the electrolyte sharing chamber 3 shown in fig. 9, in the z direction, the size of the electrolyte sharing chamber 3 is equal to the size of the supporting ribs, so that the volume of the electrolyte sharing chamber 3 is larger, and the amount of electrolyte in the whole electrolyte sharing chamber 3 is more (it should be noted that, because the lower cover plate 16 of each single battery is not in a sealed arrangement with the supporting ribs, the electrolyte can also diffuse into the cavity formed between the two supporting ribs and the casing 1 from the gap between the two), thereby increasing the cost of such a large-capacity battery.

In the utility model, two types of supporting ribs are arranged on the same supporting piece, the first type of supporting ribs mainly play a role in constructing the electrolyte sharing chamber 3, and the second type of supporting ribs mainly play a role in lifting each single battery 2, so that the height of the first type of supporting ribs in the z direction can be reduced as much as possible, the volume of the electrolyte sharing chamber 3 is reduced, and the electrolyte consumption is further reduced. Because the height of the first type supporting ribs in the z direction is reduced, the polarity terminals 5 of the single batteries can not extend out of the corresponding avoidance holes 6 smoothly, and at the moment, the polarity terminals 5 of the single batteries can be ensured to extend out of the corresponding avoidance holes 6 smoothly by increasing the height of the second type supporting ribs in the z direction. As is apparent from fig. 6, the first support rib 91 of the present utility model has a smaller size than the second support rib 92 in the z-direction. Therefore, the utility model is based on the bottom support 9, and can ensure that the single battery polar terminal 5 extends out of the corresponding avoiding hole 6 of the shell top plate 13 on the premise of smaller volume of the electrolyte sharing chamber.

The gas sharing chamber 4 in this embodiment is a gas channel disposed on the top plate 13 of the housing, as shown in fig. 4 and 5, and the top plate 13 of the housing is provided with a protrusion extending along the x direction, and the gas channel extending along the x direction is formed at the protrusion portion, and the gas channel can be formed by simultaneous extrusion while the cylinder 11 is processed by an aluminum extrusion process.

The structure of the unit cell 2 corresponding to the gas sharing chamber 4 of such a structure is shown in fig. 10 and 11:

in this embodiment, a second through hole 171 is formed in the upper cover 17 of the unit cell, and the second through hole 171 is located between the two polar terminals 5 of the unit cell 2. Sealing the second through hole 171 with the sealing assembly 10; after the unit cell 2 is mounted in the cylindrical body 11, the second through hole 171 is located below the gas sharing chamber 4, and the sealing unit 10 can be detached from the upper cover plate or an opening penetrating the second through hole 171 is formed in the sealing unit 10 to penetrate the gas sharing chamber 4 by an external force or an external electrolyte (the external electrolyte here means an electrolyte located outside the unit cell 2). The specific through mode (i.e. unpacking mode) is similar to the liquid path unpacking process, and will not be described here again.

As shown in fig. 4 and 5, the top plate 13 of the housing of the present embodiment is provided with a avoiding hole 6 which enables the polar terminal 5 of each single battery 2 to extend out; the polarity terminals 5 of the single batteries 2 extend out of the corresponding avoidance holes 6, and the areas of the shell 1 around the avoidance holes 6 are fixedly sealed with the shell of the single battery 2. As can be seen from the figure, the polar terminal 5 of the single battery 2 in this embodiment is a single battery 2 pole, and the pole of the single battery 2 is higher than that of the conventional commercial shell battery.

Referring to fig. 2 and 3, it can be seen that in this embodiment, a through groove is formed at a portion of the polarity terminal 5 of the unit cell 2 extending out of the avoiding hole 6, and the through groove is used as a heat transfer tube clamping portion 7; as can be seen from fig. 11, the polar terminal 5 of the single battery 2 in this embodiment is a cylinder, and includes 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 slot is formed in the side wall 53 of the polar terminal, that is, the opening of the through slot is located on the side wall 53.

In other embodiments, a through hole may be formed in the sidewall 53, that is, the opening of the through hole is located on the sidewall 53.

In other embodiments, a through slot may be formed in the second end surface 52, that is, the opening of the through slot is located on the second end surface 52.

The second end surface 52 is used as an electric connection part of the polar terminal 5 and is used for being connected with the first electric connection piece 21 and/or the second electric connection piece 22 to realize electric connection between each single battery 2 and/or two large-capacity batteries; the first end face is for electrical connection with an electrode assembly within the case of the unit cell 2.

The side wall 53 is provided with a through groove and a through hole, and compared with the through groove formed in the second end surface 52, the heat transfer tube 8 has larger contact area with the inner wall of the through groove or the through hole in the through groove or the through hole, and has higher heat transfer efficiency. In addition, when the through groove and the through hole are located on the side wall 53, the entire area of the second end surface 52 may be used as an electrical connection area. Two through grooves or through holes can be formed on the side wall 53 of the polar terminal at the same time, so as to increase the number of the heat transfer tubes 8, and further improve the heat transfer efficiency. The through slots are easier to install than the through hole structures.

The section of leading to the groove is the C font, and the section is the logical groove of C font, and its opening width is less than the widest department of leading to the groove, and such design is favorable to heat transfer pipe 8 interference joint in leading to the inslot, and the radian that C font led to its both ends to form has natural tension, is favorable to with heat transfer pipe 8 inseparable joint in leading to the inslot.

Fixing the heat transfer tube 8 in the through groove or the through hole (insulation between the heat transfer tube 8 and the single battery 2), and cooling the large-capacity battery by introducing a heat transfer medium with lower temperature into the heat transfer tube 8 when the temperature of the large-capacity battery is higher than a set threshold value; when the temperature of the large-capacity battery is lower than a set threshold value, heating the large-capacity battery by introducing a heat transfer medium with higher temperature into the heat transfer tube 8; by controlling the temperature of the heat transfer medium, it is ensured that the high-capacity battery always operates at a normal operating temperature.

As shown in fig. 2 and 12, the heat transfer tube 8 of the present embodiment may be a U-shaped tube section, which is divided into three parts for easy installation, and may be defined as a first tube 81, a second tube 82 and a connection tube 83, respectively.

The first tube 81 is fixed in the positive terminal through groove of each unit cell 2 in the large-capacity cell; the second tube 82 is fixed in the negative terminal through groove of each unit cell 2 in the large-capacity cell; the both ends of the connection pipe 83 are connected to ports on the same side as the first pipe 81 and the second pipe 82, respectively. The remaining two ports of the first and second tubes 82 serve as the liquid inlet and outlet of the heat transfer tube 8.

In other embodiments, two heat transfer tubes 8 may be used, where the two heat transfer tubes 8 are respectively clamped in the heat transfer tube clamping portions 7 of the positive polarity terminal and the negative polarity terminal of each unit cell 2 in the large-capacity battery.

The present embodiment can complete the assembly of the large-capacity battery by the following procedure:

Step one, processing a cylinder 11 and two end plates 12.

Step two, capacity-dividing sorting is carried out, and a plurality of single batteries 2 meeting the requirements are screened; the lower cover plate 16 of the single battery is provided with a first through hole 161 and then sealed by the sealing assembly 10; the upper cover plate 17 of the single battery is provided with a second through hole 171 and then sealed by the sealing component 10; a plurality of unit cells 2 having a sealing assembly 10 are arranged in the cylinder 11 of the first step.

The specific arrangement process is as follows:

Fixing a plurality of single batteries 2 into a whole, and pushing the single batteries into the inner cavity of the cylinder 11 from any open end of the cylinder 11; at this time, the bottoms of the individual cells 2 are in contact with the housing bottom plate 14, and the polarity terminals 5 of the individual cells 2 correspond to the corresponding escape holes 6, but do not protrude out of the escape holes 6; then supporting a plurality of single batteries 2 from the bottom by using a lifting tool, so that the bottom of each single battery 2 is separated from the bottom plate 14 of the shell, and the polarity terminal 5 of each single battery 2 extends out of the corresponding avoidance hole 6; and then, inserting the bottom support piece 9 between each single battery 2 and the bottom plate 14 of the shell along the x direction, and taking out the lifting tool.

The cylinder 11 can be turned over, the top plate of the cylinder 11 faces downwards, a plurality of single batteries 2 are fixed into a whole, and the single batteries are pushed into the inner cavity of the cylinder 11 from any open end of the cylinder 11; or sequentially pushing a plurality of single batteries 2 into the inner cavity of the cylinder 11 from any open end of the cylinder 11; under the action of gravity, the polar terminals 5 of the single batteries 2 extend out of the corresponding avoidance holes 6, and a bottom supporting piece 9 is inserted between the bottom of each single battery 2 and the bottom plate 14 of the shell; the cylinder 11 is turned over with the top plate of the cylinder 11 facing upwards.

It should be noted that, in the z-direction, the dimensions of the bottom support 9 are such that: after the bottom supporting piece 9 is additionally arranged between the bottom of each single battery 2 and the bottom plate 14 of the shell, the polarity terminal 5 of each single battery 2 extends out of the corresponding avoiding hole 6.

Step three, sealing the peripheral parts of the avoidance holes 6 and the polar terminals of the shell of the single battery 2; the end plates 12 are welded to the opposite open ends of the barrel 11.

And step four, opening the sealing assembly 10 by using external force or electrolyte, wherein the inner cavity of the electrolyte sharing chamber 3 is communicated with the electrolyte areas of the inner cavities of the single batteries 2, and the inner cavity of the gas sharing chamber 4 is communicated with the gas areas of the inner cavities of the single batteries 2.

After the inner cavities of the single batteries 2 are communicated with the electrolyte sharing chamber 3, the electrolyte in the inner cavities of the single batteries 2 is communicated through the electrolyte sharing chamber 3, so that the continuity of the electrolyte can be ensured by injecting the electrolyte into the electrolyte sharing chamber 3 after the inner cavities of the single batteries 2 are communicated with the electrolyte sharing chamber 3 in order to prevent the phenomenon of electrolyte interruption.

The heat transfer tubes 8 are then fixed in the through slots on the respective polarity terminals 5, and all the unit cells 2 are connected in parallel using the first electrical connector 21 shown in fig. 12. This step may also be performed before step four.

In order to form a more complete SEI film, the large-capacity battery has more stable circulation capacity, and after electrolyte is injected into the inner cavities of all the single batteries 2 through the electrolyte sharing chamber 3, the whole large-capacity battery is formed.

Example 2

In embodiment 1, when the heat transfer tube 8 contacts the polar terminal 5 of the unit cell 2 for heat exchange, insulation is required between the heat transfer tube 8 and the polar terminal 5 of the unit cell 2 and between the heat transfer tube 8 and the unit cell 2, and this embodiment provides a heat transfer tube 8 with double-layer insulation, which is mounted on the polar terminal 5 of the unit cell 2, so that the polar terminal 5 of the unit cell 2 and the heat transfer tube 8 have reliable insulation performance during heat exchange.

The heat transfer tube 8 of the present embodiment specifically includes a metal tube having an insulating layer and an insulating jacket thereon; the insulating layer is formed on the pipe wall of the metal pipe, and the insulating sleeve is arranged on the metal pipe with the insulating layer. The insulating layer and the insulating sleeve are simultaneously arranged on the pipe wall of the heat transfer pipe 8, which is in contact with the polar terminal 5 of the single battery 2, so that double insulation is formed, and when the heat transfer pipe 8 is in contact with the polar terminal 5 of the single battery 2 for heat exchange, even if one of the insulating layer or the insulating sleeve is damaged, the reliable insulating performance can be maintained between the heat transfer pipe 8 and the polar terminal 5 of the single battery 2, so that the safety of the single battery 2 in the use process is improved. The specific structure of the heat transfer tube 8 formed of the metal tube, the insulating layer and the insulating jacket will be described in detail below.

The heat transfer pipe 8 is a pipe having a heat exchange function, and is mainly in contact with the polar terminal 5 of the unit cell 2, and is used for exchanging heat with the polar terminal 5 of the unit cell 2. The cross-sectional shape of the heat transfer pipe 8 is not required as long as it can exchange heat by contacting the polar terminals 5 of the unit cells 2, and for example, square pipes, elliptical pipes, round pipes, and the like can be used. In this embodiment, the heat transfer tube 8 is preferably a circular tube, which is convenient to install, and can be made of existing metal tubes, and has relatively low cost.

The heat transfer pipe 8 in this embodiment is specifically a metal pipe with good heat transfer performance, such as an aluminum pipe, a copper pipe, or the like. Preferably, the heat transfer tube 8 is an aluminum tube with good heat transfer effect and relatively low cost. In order to ensure the heat conduction effect, the thinner the wall thickness of the aluminum pipe is, the better, but if the wall thickness of the aluminum pipe is too thin, the aluminum pipe is relatively soft and is easy to bend and break during installation. Therefore, in the present embodiment, the aluminum pipe preferably has a wall thickness of 0.5mm to 1mm, which has good heat conductivity while maintaining the reliability of its installation, avoiding the risk of easy bending damage when the aluminum pipe is thin. In specific use, the diameter of the aluminum pipe is generally about 10mm to 20 mm.

In the heat transfer tube 8 of this embodiment, the insulating layer is formed on the tube wall of the aluminum tube, and is of an integral structure with the aluminum tube, and it can be realized in the following ways:

Firstly, forming a ceramic coating, namely a high-temperature electric insulating coating, on the pipe wall of an aluminum pipe to form an insulating layer, wherein the ceramic coating can be a boron nitride coating, an aluminum oxide coating or a copper fluoride coating; however, the insulating layer formed by the method is easy to fall off, and the processing cost is high;

Secondly, coating a layer of insulating material (such as insulating paint and the like) on the wall surface of the aluminum pipe to form an insulating layer; the mode is convenient to process and implement, and the processing cost is low;

Thirdly, oxidizing the aluminum tube to form an insulating layer; the oxidation treatment is to utilize the chemical reaction of the metal surface and oxygen to form an oxide film to improve the insulation performance of the metal surface. For example, electrochemical oxidation methods, and the like. Specifically, the aluminum pipe is subjected to an oxidation treatment to form a hard oxide layer. The insulating layer formed by the method is not easy to fall off, and the insulating performance is relatively good.

The thicker the hard oxide layer formed by the oxidation treatment, the better the insulation, but the heat conductivity thereof will be lowered. In this embodiment, the thickness of the hard oxide layer is preferably 20um to 50um, and the hard oxide layer with the thickness ensures the insulation performance and also makes the pipe wall of the aluminum pipe have better heat conduction performance.

In this embodiment, in order to ensure the reliability of insulation, an insulating jacket is provided outside the aluminum pipe having an insulating layer as described above so as to form double insulation on the outer wall of the aluminum pipe.

The insulating sleeve can be specifically manufactured by adopting an insulating material with good heat conduction performance, so that the insulating sleeve has good heat conduction performance and good insulating performance. In this embodiment, the insulating sleeve is a heat-conducting plastic sleeve or a heat-conducting rubber sleeve with better insulating performance and heat-conducting performance, for example, a heat-conducting silica gel sleeve, and the thickness of the insulating sleeve is preferably 0.1 mm-1 mm, and the thickness can ensure good heat-conducting performance when ensuring good insulating performance. The cross section shape of the insulating sleeve can be round, U-shaped or C-shaped, and the insulating sleeve can be sleeved on an aluminum pipe with an insulating layer to insulate the contact part of the aluminum pipe and the polar terminal 5 of the single battery 2. Meanwhile, the cross section shape of the insulating sleeve is preferably the same as that of the aluminum pipe, so that the insulating sleeve can be tightly nested on the aluminum pipe to improve the heat conducting performance of the aluminum pipe.

In other embodiments, an oxide layer can be directly arranged on the wall of the aluminum pipe or an insulating sleeve can be sleeved on the wall of the aluminum pipe, so that the structure is relatively simple, but if the thickness of the oxide layer or the insulating sleeve is thinner, the oxide layer or the insulating sleeve is easy to fall off or be scratched, and the problem of unreliable insulation exists.

Example 3

In the long-time use process, due to the temperature difference between the inside and the outside of the heat transfer pipe 8, condensation can be generated on the surface, and when the condensation is gathered to a certain amount, the condensation can permeate into a gap between the polar terminal 5 and the avoidance hole 6, so that the polar terminal 5 is electrically conducted with the shell 1, and further the short circuit of the same single battery 2 can be possibly caused.

The present embodiment overcomes the above-mentioned problems by optimizing the top structure of the large-capacity battery, laying the insulating sealant layer 20 on the top plate 13 of the housing, and extending the electrical connection portions (the second end faces 52) of the polarity terminals 5 of the respective unit cells 2 out of the insulating sealant layer 20 for connection with the first electrical connection member 21 or the second electrical connection member 22; the liquid inlet end and the liquid outlet end of the heat transfer tube 8 extend out of the insulating sealant layer 20 and are used for being connected with liquid cooling equipment. The first electrical connector 21 is a connector for connecting each unit cell 2 in parallel, and the second electrical connector 22 is a connector for connecting two large-capacity batteries in series, or a connector for connecting the large-capacity batteries with an external load.

As shown in fig. 13, in this embodiment, an insulating sealant layer 20 is laid on the top plate 13 of the housing, and as can be seen from the figure, a partial area of the polar terminal 5 of each unit cell 2 is covered by the insulating sealant layer 20, and the electrical connection portion (i.e., the second end face 52) of the polar terminal 5 of each unit cell 2 extends out of the insulating sealant layer 20 and is connected to the first electrical connector 21 and/or the second electrical connector 22; the main body part of the heat transfer tube 8 is covered by an insulating sealing glue layer 20, and the liquid inlet end and the liquid outlet end of the heat transfer tube 8 extend out of the insulating sealing glue layer 20 and are used for being connected with liquid cooling equipment.

In other embodiments, the size of the insulating sealant layer 20 in the z-direction may be smaller, lower than the main portion of the heat transfer tube 8, or cover a partial area of the main portion of the heat transfer tube 8; only the condensation can not enter the gap between the polar terminal 5 and the avoiding hole 6.

The insulating sealant used in the embodiment is generally a battery pouring sealant commonly used for batteries, for example, an organosilicon heat conduction pouring sealant can be used, and the insulating sealant has good sealing, insulating, vibration-resisting, heat dissipation, water resistance and other functions.

In order to prevent the insulation sealing glue solution from overflowing, in the glue injection process of the embodiment, a glue injection mold can be additionally arranged at the peripheral edge of the top plate 13 of the shell, so that the insulation sealing glue solution can be injected smoothly. And after the glue injection is finished, demoulding.

Referring to fig. 14, the first electrical connectors 21 of this embodiment are two. One of the first electrical connectors 21 is connected to the positive terminal second end face 52 of all the unit cells 2 in the large-capacity battery; the other first electrical connector 21 is connected to the negative terminal second end face 52 of all the unit cells 2 in the large-capacity battery. And further realizes the parallel connection of all the single batteries 2 in the large-capacity battery.

As can be seen from the figure, in this embodiment, the first electrical connector 21 is a metal plate, and may be made of copper, aluminum or other metal materials, and in this embodiment, aluminum is selected based on cost considerations.

The first electrical connector 21 and the polar terminal 5 of the single battery 2 may be connected by a screw or by welding, and in consideration of the reliability of the connection, the connection between the two is realized by welding in this embodiment.

In this embodiment, 13 second electrical connectors 22 are fixed to the electrical connection parts of the polarity terminals 5 of the respective unit cells 2; in other embodiments, the number of the second electrical connectors 22 may be determined according to actual requirements, and may be directly connected to the first electrical connectors 21.

Example 4

In the above embodiment, the polar terminal 5 is directly exposed to the external environment, and there is a great potential safety hazard due to the electrification of the polar terminal 5 during use. Based on this, as shown in fig. 15 and 16, the insulating protection cover 15 is arranged on the top of the high-capacity battery according to the embodiment, so as to provide insulating protection for the polar terminal 5, avoid potential safety hazards possibly existing when the polar terminal 5 is exposed in the operation process of the high-capacity battery, and also avoid the problem that some foreign matters in the external environment fall into the position of the polar terminal 5 to cause short circuit of the high-capacity battery, thereby improving the safety of the high-capacity battery.

It should be noted that, if the insulating protection cover 15 wraps all the polar terminals 5, it is difficult to electrically connect such a large-capacity battery, so in this embodiment, the side wall parallel to the xz plane of the insulating protection cover 15 is provided with the slit 153, and the second electrical connector 22 can be connected to the polar terminals 5 through the slit 153, thereby realizing electrical connection.

It should be noted that, the side wall of the insulating protection cover 15 needs to be provided with a channel for extending the liquid inlet end and the liquid outlet end of the heat transfer tube 8.

In order to facilitate the electrical connection process, the insulation protection cover 15 is designed to be a split structure in this embodiment, as shown in fig. 16, and includes an insulation frame 151 and an insulation cover plate 152 covering the insulation frame 151; the lower end of the insulating frame 151 is used for matching with the top of the high-capacity battery, and is fixed on the top of the high-capacity battery in a mode of screw connection or bonding, etc., the upper end of the insulating frame 151 is buckled and provided with an insulating cover plate 152, and the upper end of the side wall parallel to the xz plane of the insulating frame 151 is provided with a notch, and the notch and the insulating cover plate 152 are matched to form the slit 153.

In assembly, the insulating frame 151 may be fixed to the top of the large-capacity battery, the second electrical connector 22 may be connected to the polar terminal 5 through the slit 153, and the insulating cover 152 may be fixed to the upper end of the insulating frame 151 after the glue is injected.

In addition, in embodiment 3, in order to prevent the insulation sealing glue from overflowing during the glue injection process, a glue injection mold is needed, but after the glue injection is completed, the demolding is needed, and the process is complicated; in addition, during the demolding, the structure of the insulating sealant layer 20 may be damaged, resulting in a decrease in sealing reliability.

In this embodiment, the insulating frame 151 of the insulating protective cover 15 may be used as an injection mold, and the injection molding is completed without demolding, and the bonding strength between the insulating frame 151 and the top of the high-capacity battery may be improved.

Claims (11)

1. A high capacity battery characterized by: comprises a shell (1), a plurality of single batteries (2) and a heat transfer tube (8); the plurality of single batteries (2) are arranged in the shell (1) along the same direction;

The shell (1) is provided with a shared cavity, and the inner cavity of the shared cavity is communicated with the inner cavities of all the single batteries (2);

The shell top plate (13) is provided with avoidance holes (6) corresponding to the polarity terminals (5) of the single batteries (2); the polarity terminals (5) of the single batteries (2) extend out of the avoidance holes (6), and the areas of the shell top plates (13) corresponding to the avoidance holes (6) are fixedly sealed with the shell of the single batteries (2);

The part of each single battery (2) with the polarity terminal (5) extending out of the avoidance hole (6) is provided with a heat transfer tube clamping part (7);

The heat transfer pipe (8) is fixed on the heat transfer pipe clamping part (7) of the polar terminal (5) of each single battery (2), and the heat transfer pipe (8) is insulated from each single battery (2).

2. The high-capacity battery according to claim 1, wherein: the heat transfer tube clamping part (7) is a through groove or a through hole which is formed at the position of the polarity terminal (5) of each single battery (2) extending out of the avoidance hole (6).

3. The high-capacity battery according to claim 2, wherein: the single battery (2) polarity terminal (5) is a columnar body and comprises a first end face, a second end face (52) and a side wall (53); the first end face is used for being electrically connected with the electrode assembly; the second end face (52) serves as an electrical connection; the through groove or the through hole is formed in the side wall (53).

4. A high-capacity battery according to any one of claims 1 to 3, wherein: the heat transfer pipe (8) includes a first pipe (81), a second pipe (82), and a connection pipe (83);

The first tube (81) is fixed in the heat transfer tube clamping part (7) of the positive terminal of each single battery (2) in the large-capacity battery; the second tube (82) is fixed in the heat transfer tube clamping part (7) of the negative terminal of each single battery (2) in the large-capacity battery;

The two ends of the connecting pipe (83) are respectively connected with the ports of the first pipe (81) and the second pipe (82) which are positioned on the same side.

5. The high-capacity battery as claimed in claim 4, wherein: the first pipe (81) and the second pipe (82) 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 the oxide layers;

or the first pipe (81) and the second pipe (82) are aluminum pipes, and insulating sleeves are sleeved on the aluminum pipes;

or the first pipe (81) and the second pipe (82) are aluminum pipes, and the pipe walls of the aluminum pipes are provided with oxide layers.

6. A high-capacity battery as claimed in claim 3, wherein: an insulating sealant layer (20) is paved on the shell top plate (13); the second end face (52) of each single battery (2) polarity terminal (5) stretches out of the insulating sealing glue layer (20), and the liquid inlet end and the liquid outlet end of the heat transfer tube (8) stretch out of the insulating sealing glue layer (20).

7. A high-capacity battery as claimed in claim 3, wherein: also comprises two first electrical connectors (21);

One of the first electric connecting pieces (21) is connected with the second end faces (52) of the positive polarity terminals of all the single batteries (2) in the large-capacity battery; the other first electric connector (21) is connected with the second end face (52) of the negative terminal of all the single batteries (2) in the large-capacity battery.

8. The high-capacity battery as claimed in claim 7, wherein: the battery pack also comprises an insulation protection cover (15), wherein the insulation protection cover (15) is arranged at the top of the shell (1) of the high-capacity battery, and the polarity terminals (5) of the single batteries (2) are positioned in the insulation protection cover (15);

Defining the length direction of the shell (1) as the x direction, the width direction as the y direction and the height direction as the z direction;

The side wall of the insulating protective cover (15) parallel to the yz plane is provided with a channel for extending out the liquid inlet end and the liquid outlet end of the heat transfer pipe (8);

Slits (153) are formed in two side walls of the insulating protective cover (15) parallel to the xz plane, and the electric connection parts of the polarity terminals (5) of the single batteries (2) are connected with the second electric connection piece (22) through the slits (153).

9. The high-capacity battery according to claim 1, wherein: the sharing chamber is an electrolyte sharing chamber (3) and is a liquid channel (19) positioned between the bottom plate (14) of the shell and each single battery (2), and the liquid channel is communicated with the electrolyte area in the inner cavity of each single battery (2).

10. The high-capacity battery according to claim 9, wherein: a bottom support (9) is arranged between the bottom plate (14) of the shell and each single battery (2); the bottom support (9) comprises a flat plate, at least two first support ribs (91) extending along the x direction are arranged on the upper surface of the flat plate, each single battery (2) is supported on the first support ribs (91), and a liquid channel is formed between every two adjacent first support ribs (91) and used as an electrolyte sharing chamber (3); the lower surface of the flat plate is provided with a second supporting rib (92) extending along the x direction and is in direct contact with the bottom plate (14) of the shell.

11. The large-capacity battery according to claim 1 or 9, characterized in that: the sharing chamber is a gas sharing chamber (4) and is a gas channel between the top plate (13) of the shell and each single battery (2), and the gas channel is communicated with the gas area in the inner cavity of each single battery (2).