CN218005132U - Cylindrical battery CTC group structure - Google Patents

Abstract

The utility model provides a cylindrical battery CTC group structure, which is characterized in that a bus bar and a pole column can be protected by the elasticity of structural adhesive by inverting the cylindrical battery and bonding the cylindrical battery with a vehicle chassis through the structural adhesive, so that the compression resistance of the cylindrical battery CTC group structure is improved; in addition, the structural adhesive can also play a role in insulating and isolating air, so that short circuit and corrosion are prevented; thirdly, after the structure is adopted, the bottom surface of the cylindrical battery, the insulating layer and the bottom cover of the cabin can be in over fit, and compared with the original loose fit, the space utilization rate in the height direction can be improved, and the energy density is improved; fourthly, an embedded groove is formed in the vehicle chassis, so that the original reinforcing ribs and grooves can be replaced, and the energy density is further improved; the bus bar with two C-shaped ends is arranged, so that the bus bar can be conveniently welded with the cylindrical battery pole column and the cover plate to realize quick series connection and prevent error contact short circuit; the busbar still includes side connecting portion, is convenient for realize parallelly connected between the cylinder battery fast.

Description

Cylindrical battery CTC group structure

Technical Field

The utility model relates to a lithium ion battery field especially relates to a cylinder battery CTC group structure.

Background

With the high-speed development of electric vehicles, the technology of batteries is also continuously broken through, the CTC technology is a process of directly integrating a single battery cell on a vehicle chassis, the process deepens the integration level of a battery system, a power system and the chassis of the electric vehicle, reduces the number of parts, saves space, improves structural efficiency, greatly reduces vehicle weight, increases the battery endurance mileage, and is considered as a key core technology for determining the competition of new energy vehicles in the next stage.

The conventional cylindrical battery CTC grouping mode is mainly a battery bracket mode and a mode of directly integrating the battery bracket into a vehicle chassis. The support has the intensity problem, can't satisfy the bearing demand of higher series-parallel connection quantity. CN114665205A provides a common CTC battery pack, which comprises a layer of insulating protection plate disposed on the top of the battery, and a cabin bottom cover disposed above the insulating protection plate, wherein the cabin bottom cover cannot compress the insulating protection plate, so as to prevent the bus bar on the top of the battery from being deformed by extrusion, and the above structure results in low utilization rate of the top space of the battery; in addition, the bottom of the battery is generally fixed on a vehicle chassis by structural adhesive, and the structural adhesive also occupies a certain height space; thirdly, considering that a series of reinforcing ribs and grooves need to be arranged on the existing vehicle chassis to improve the strength of the vehicle chassis and reduce the weight of the vehicle, flat plates need to be arranged on the reinforcing ribs and the grooves for leveling, and the batteries are bonded on the flat plates through structural adhesive, so that the flat plates can also occupy the space height. In summary, the above design method results in the low utilization rate of the whole space of the box body, reduces the energy density of the battery, and seriously affects the performance of the battery.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a cylindrical battery CTC group's structure can improve space utilization to improve battery energy density.

The technical scheme of the utility model is realized like this: the utility model provides a cylindrical battery CTC group structure, which comprises a plurality of cylindrical batteries, a plurality of bus bars, a vehicle chassis, an insulating layer and a cabin bottom cover, wherein,

the cylindrical battery comprises a shell and a pole, wherein the pole is arranged on one end face of the shell, and the shell and the pole are respectively electrified and have opposite polarities; a plurality of cylindrical batteries are arranged in a horizontal inner matrix on the vehicle chassis;

two ends of the bus bar are respectively welded with the shells or the poles on different cylindrical batteries and are electrically connected;

the end, provided with the pole, of the cylindrical battery is arranged downwards, the surface of the vehicle chassis is provided with a plurality of embedded grooves which are matched with the end part of the downward side of the cylindrical battery and the bus bar in shape, and the end part of the downward side of the cylindrical battery and the bus bar are arranged in the embedded grooves and fixed with the embedded grooves through structural adhesive; an insulating layer is laid on the upper surface of each cylindrical battery, and a cabin bottom cover is buckled on the insulating layer and is fixedly connected with a vehicle chassis.

On the basis of the above technical scheme, preferably, the casing includes cylinder, first end cover and second end cover, cylinder both ends opening, and first end cover, second end cover set up respectively in cylinder both ends opening part and welded fastening, are provided with utmost point post in the middle of the first end cover, and first end cover is electrified respectively with utmost point post and polarity is opposite.

Further preferably, the busbar includes first weld part, second weld part and intermediate junction portion, and first weld part and second weld part pass through intermediate junction portion and connect, and first weld part and second weld part are "C" shape respectively, and "C" shape opening is to intermediate junction portion dorsad, and first weld part is laminated and welded fastening with the utmost point post terminal surface of one of them cylindrical battery, and the second weld part is laminated and welded fastening with the first end cover terminal surface of another cylindrical battery adjacent with same row, and utmost point post sets up in second weld part "C" shape.

Preferably, the bus bar further includes a side connection portion disposed on a side surface of the second welding portion and selectively welded to and electrically connected with the second welding portion of the same adjacent bus bar.

Still further preferably, the battery pack further comprises a total positive bus bar and a total negative bus bar, wherein the poles on the cylindrical batteries in the outermost row of the matrix arrangement are respectively welded and electrically connected with the positive bus bar, and the first end covers on the cylindrical batteries in the outermost row of the matrix arrangement and far away from the positive bus bar are welded and electrically connected.

On the basis of the technical scheme, the solar water-cooling device is preferable to further comprise a plurality of water-cooling plates, the water-cooling plates are arranged between the cylindrical batteries in the adjacent rows of the water-cooling plates, and reinforcing ribs are arranged on the water-cooling plates.

Preferably, the first end cover is provided with a liquid injection hole, and the liquid injection hole is arranged at the C-shaped opening of the second welding part.

Still further preferably, the cylindrical battery further comprises an explosion-proof valve, and the explosion-proof valve is an arc-shaped weak line which is arranged at the welding position of the second end cover and the cylindrical barrel and faces below the horizontal plane.

Still further preferably, insulating heat-conducting glue is filled between the cylindrical batteries arranged in the matrix and between the cylindrical batteries and the water cooling plate, and the filling height of the insulating heat-conducting glue is not more than that of the explosion-proof valve.

Further preferably, the first end cap comprises an integrally formed panel, an inner plate and a plurality of connecting rings, the panel and the inner plate are arranged in parallel, and the connecting rings are concentrically nested between the panel and the inner plate.

Preferably, the inner side surface of the inner plate is sequentially paved with a layer of glass fiber substrate and a layer of epoxy resin, and the glass fiber substrate, the epoxy resin and the inner plate are integrally molded through high-temperature vacuum infiltration.

On the basis of the technical scheme, preferably, the insulating layer is formed by compounding mica sheets and glass fibers.

In a second aspect, the present invention provides a method for preparing a cylindrical battery CTC grouped structure according to the first aspect of the present invention, comprising the following steps,

s1, arranging a plurality of cylindrical batteries on a vehicle chassis in a horizontal inner matrix, and welding a bus bar;

s2, coating structural adhesive in the embedded groove, placing one side of the cylindrical battery welding bus bar in the embedded groove and fixing the side of the cylindrical battery welding bus bar with the embedded groove through the structural adhesive.

The utility model discloses a cylinder battery CTC is structure in groups has following beneficial effect for prior art:

(1) By inverting the cylindrical battery and bonding the cylindrical battery with the vehicle chassis through the structural adhesive, the elasticity of the structural adhesive can protect the busbar and the pole, and the pressure resistance of the busbar and the pole is improved; in addition, the structural adhesive can also play a role in insulating and isolating air, so that short circuit and corrosion are prevented; thirdly, after the structure is adopted, the bottom surface of the cylindrical battery, the insulating layer and the bottom cover of the cabin can be in over fit, and compared with the original loose fit, the space utilization rate in the height direction can be improved, and the energy density is improved; fourthly, an embedded groove is formed in the vehicle chassis, so that the original reinforcing ribs and grooves can be replaced, and the energy density is further improved;

(2) The bus bar with the two C-shaped ends is arranged, so that the bus bar can be conveniently welded with the cylindrical battery pole and the cover plate to realize quick series connection and prevent mistaken contact short circuit;

(3) The bus bar also comprises a side connecting part, so that the parallel connection between the cylindrical batteries can be realized quickly;

(4) The explosion-proof valve is arranged laterally, so that hot air flow and substances are prevented from being sprayed upwards to a cab when thermal runaway occurs, and the safety performance is improved;

(5) The insulating heat-conducting glue is filled, so that the heat dissipation performance is improved, and the waterproof and short-circuit-proof effects are achieved;

(6) The hollow first end cover has certain deformation capacity, and the assembly flexibility and the later-period circular deformation range of the cylindrical battery are increased;

(7) The inner side surface of the first end cover, the glass fiber substrate and the epoxy resin are integrally formed through high-temperature vacuum infiltration, so that the inner strength is ensured, and the inner side of the first end cover is insulated; meanwhile, sub parts such as internal insulation sheets, insulation foam and the like are optimized, and the assembly procedures are reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a perspective view of the cylindrical battery CTC grouped structure of the present invention after removing the insulating layer and the bottom cover of the cabin;

FIG. 2 is a front sectional view of the assembled structure of the cylindrical battery CTC of the present invention;

fig. 3 is a bottom view of the assembled cylindrical battery, bus bar, total positive bus bar, total negative bus bar, and water-cooled plates of the present invention;

FIG. 4 is a perspective view of a vehicle chassis with a cylindrical battery CTC group structure according to the present invention

FIG. 5 is an enlarged view of the circled area in FIG. 2;

fig. 6 is an assembled perspective view of the cylindrical battery, the bus bar and the water-cooling plate of the present invention;

fig. 7 is a perspective view of the cylindrical battery of the present invention;

fig. 8 is a top view of the cap assembly of the cylindrical battery of the present invention;

FIG. 9 isbase:Sub>A sectional view taken along line A-A of FIG. 8;

FIG. 10 is an enlarged view of the oval area of FIG. 8;

fig. 11 is a perspective view of the bus bar of the present invention.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in fig. 1-3, the utility model discloses a cylindrical battery CTC group structure, it includes a plurality of cylindrical battery 1, a plurality of busbar 2, vehicle chassis 3, insulating layer 4, passenger cabin bottom 5, total positive busbar 6, total negative busbar 7 and a plurality of water-cooling plate 8.

As shown in fig. 7 to 9, the cylindrical battery 1 includes a casing 11 and a pole 12, the pole 12 is disposed on an end surface of the casing 11, and the casing 11 and the pole 12 are respectively charged and have opposite polarities. Generally, the case 11 is a negative electrode, and the electrode post 12 is a positive electrode. Specifically, the housing 11 includes a cylindrical barrel 111, a first end cap 112 and a second end cap 113, two ends of the cylindrical barrel 111 are open, the first end cap 112 and the second end cap 113 are respectively disposed at two ends of the cylindrical barrel 111 and are welded and fixed, the pole 12 is disposed in the middle of the first end cap 112, and the first end cap 112 and the pole 12 are respectively electrified and have opposite polarities. The above is the design of the existing cylindrical battery, and the details are not repeated herein.

A plurality of cylindrical batteries 1 are arranged in a horizontal inner matrix on a vehicle chassis 3. Taking fig. 3 as an example, the rows are in the transverse direction; the longitudinal direction is a column.

And two ends of the bus bar 2 are respectively welded and electrically connected with the shells 11 or the poles 12 on different cylindrical batteries 1.

As the improved part of the utility model, as shown in fig. 4-6, the one end that cylindrical battery 1 was provided with utmost point post 12 sets up down, and 3 surfaces on vehicle chassis are provided with a plurality of embedded grooves 30 that suit with the tip of cylindrical battery 1 one side down and the shape of busbar 2, and the tip of cylindrical battery 1 one side down and busbar 2 are arranged in embedded groove 30 and are glued fixedly with it through the structure. Compared with the existing cylindrical battery 1, the design method has the following advantages: by inverting the cylindrical battery 1 and bonding the cylindrical battery with the vehicle chassis 3 through the structural adhesive, the elasticity of the structural adhesive can play a role in buffering, the bus bar 2 and the pole 12 are protected, and the pressure resistance of the bus bar is improved; in addition, the structural adhesive can also play a role in insulating and isolating air, so as to prevent short circuit and corrosion, and for the design that the bus bar 2 is arranged at the lower part, the structural adhesive is arranged at the upper part relative to the bus bar 2; thirdly, after the structure is adopted, the bottom surface of the cylindrical battery 1, the insulating layer 4 and the cabin bottom cover 5 can be in over fit, and compared with the original loose fit, the space utilization rate in the height direction can be improved, and the energy density is improved; fourthly, the embedded groove 30 is arranged on the vehicle chassis 3, which can replace the original reinforcing rib and groove, and further improve the energy density.

The insulating layer 4 is laid on the upper surface of each cylindrical battery 1 to prevent short circuit and play a role in buffering. Specifically, the insulating layer 4 is formed by compounding mica sheets and glass fibers. The function of the heat insulation device is to insulate heat and prevent high-temperature gas from entering a cab; and secondly, the glass fiber increases the mechanical strength of the whole insulating layer 4, so that the insulating layer has a drainage effect and can guide high-temperature gas and liquid to be discharged towards the outside of the vehicle.

The cabin bottom cover 5 is buckled on the insulating layer 4 and is fixedly connected with the vehicle chassis 3. Specifically, the bottom surface of the cylindrical battery 1, the insulating layer 4 and the cabin bottom cover 5 are excessively matched, so that the space utilization rate in the height direction is improved, and the energy density is improved.

The utility model discloses design busbar 2 alone to the structure that adaptation cylindrical battery 1 invertd, it is concrete, as shown in fig. 6 and 11, busbar 2 includes first weld part 21, second weld part 22 and intermediate junction portion 23, first weld part 21 and second weld part 22 pass through intermediate junction portion 23 and connect, first weld part 21 and second weld part 22 are "C" shape respectively, and "C" shape opening intermediate junction portion 23 dorsad, first weld part 21 laminates and welded fastening with the utmost point post 12 terminal surface of one of cylindrical battery 1, second weld part 22 laminates and welded fastening with the first end cover 112 terminal surface of another cylindrical battery 1 adjacent with same row, utmost point post 12 sets up in second weld part 22"C" shape.

Specifically, the cross sectional dimension of the first welding portion 21 is smaller than the end face of the pole 12, the outer ring of the second welding portion 22 is located within the end face of the first end cover 112, and the inner ring of the second welding portion 22 is located outside the outer ring of the pole 12, so that the fool-proof effect can be achieved during assembly.

Specifically, the size of the opening of the "C" shape of the second welding portion 22 is larger than that of the intermediate connecting portion 23, so that the adjacent intermediate connecting portions 23 are prevented from contacting with the second welding portion 22 after tilting, and the mis-connection is prevented.

Specifically, the thickness of the bus bar 2 is between 1 and 2mm, wherein the radian of the "C" shaped portion of the first welding portion 21 and the second welding portion 22 is not less than 60 °.

Specifically, there is a height difference between the first welding part 21 and the second welding part 22 to accommodate the height difference between the end surface of the pole 12 and the end surface of the first end cap 112.

As the external electrode segments of the battery pack, as shown in fig. 3, the battery pack further includes a total positive electrode bus bar 6 and a total negative electrode bus bar 7, wherein the electrode posts 12 on the cylindrical batteries 1 in the outermost row of the matrix arrangement are respectively welded and electrically connected to the positive electrode bus bar 6, and the first end caps 112 on the cylindrical batteries 1 in the outermost row of the matrix arrangement and away from the positive electrode bus bar 6 are welded and electrically connected. Specifically, the total positive electrode bus bar 6 and the total negative electrode bus bar 7 are arranged on two sides of the cylindrical batteries 1 arranged in the matrix, and the total positive electrode bus bar 6 and the total negative electrode bus bar 7 both adopt a linear sheet structure.

Considering that the single body capacity of the cylindrical battery 1 is low, in order to increase the capacity of the entire battery pack, a parallel connection process is required, and as a preferred embodiment, the bus bar 2 further includes a side connection portion 24 disposed at a side of the second welding portion 22 and selectively welded and electrically connected to the second welding portion 22 of the adjacent bus bar 2 in the same row. It should be noted that the side connection portion 24 is not necessarily required, and may be provided in parallel with the cylindrical battery 1 depending on whether or not the cylindrical battery is required. Cylinder battery 1 can high-efficiently be connected to busbar 2 of dislocation design more than adopting, satisfies the requirement that cylinder battery 1 homonymy carries out the series-parallel connection, has promoted volume energy density, and makes things convenient for the later stage to overhaul.

Specifically, as shown in fig. 7 to 10, the first end cap 112 is provided with a pour hole 10, and the pour hole 10 is provided at the C-shaped opening of the second welded portion 22 in order to avoid the welding affecting the sealing of the pour hole 10.

The water cooling plate 8 cools the cylindrical battery 1, and belongs to the prior art. The utility model discloses in, water-cooling board 8 sets up between the cylinder battery 1 of adjacent row, and is provided with the strengthening rib on the water-cooling board 8. Specifically, the water cooling plate 8 is made of 6 series aluminum alloy and is formed by extrusion; the wall thickness of the reinforcing rib is at least 1mm, and the excircle radius is between 3 mm and 5 mm. The water cooling plate 8 preferably takes the shape of a serpentine plate.

Since the cylindrical battery 1 is expanded in the height direction, the conventional explosion-proof valve is arranged on the second end cover 113 at the bottom of the cylindrical battery 1, and the explosion-proof valve faces the cab when the cylindrical battery 1 is inverted, so that the thermal runaway risk is increased. In order to further solve the problem, the cylindrical battery 1 further comprises an explosion-proof valve 110, and the explosion-proof valve 110 is an arc-shaped weak line which is opened at the welding position of the second end cover 113 and the cylindrical barrel 111 and faces to the lower part of the horizontal plane. Specifically, the explosion-proof valve 110 is a dent with the depth of 0.1-0.2 mm, the orientation is 30-60 degrees below the horizontal plane, preferably 60 degrees, and the structure can keep no air leakage phenomenon for 30s under the air pressure of 0.2 MPa; when the gas is seriously generated in the cylindrical battery 1, the internal air pressure reaches the set explosion value of 0.7 +/-0.15 MPa, and the rapid pressure relief can be smoothly completed. Meanwhile, the highest pressure relief radius is ensured to be positioned below the horizontal plane, and hot air flow and substances are prevented from entering the cab.

In order to further avoid that the thermal substance stays at the bottom of the battery pack due to gravity, pollutes the bus bar 2 and causes short circuit, after the positioning of the cylindrical battery 1 is completed, all gaps need to be filled with insulating heat-conducting glue for protection. The first one can strengthen structural strength, increases the whole mechanical properties of battery package, and its second one can prevent that heat conduction material such as electrolyte after the thermal runaway from flowing to busbar 2 and leading to the short circuit. Specifically, insulating heat-conducting glue is filled between the cylindrical batteries 1 arranged in the matrix and between the cylindrical batteries 1 and the water cooling plate 8, and the filling height of the insulating heat-conducting glue is not more than that of the explosion-proof valve 110.

Since the pole 12 of the cylindrical battery 1 faces downwards, and the casing 11 is usually a negative pole, the insulation inside the battery cell is particularly important, and if the positive pole tab is welded to contact with the casing 11, a severe thermal runaway problem can occur. Therefore, to further enhance the safety of the present design, a further improvement is made on the first end cap 112: the first end cap 112 includes a panel 1121, an inner plate 1122, and a plurality of connection rings 1123, the panel 1121 and the inner plate 1122 are disposed in parallel, and the plurality of connection rings 1123 are concentrically nested between the panel 1121 and the inner plate 1122. The first end cover 112 which is hollowed out and supported by the connecting ring 1123 has certain deformation capacity, and the assembly flexibility and the later-period circulating deformation range of the battery cell are increased.

In order to improve the insulation performance of the first end cap 112, a layer of glass fiber substrate 13 and a layer of epoxy resin 14 are sequentially laid on the inner side surface of the inner plate 1122, and the glass fiber substrate 13 and the epoxy resin 14 are integrally formed with the inner plate 1122 through high-temperature vacuum infiltration. The inner side surface of the first end cover 112, the glass fiber substrate 13 and the epoxy resin 14 are integrally formed through high-temperature vacuum infiltration, and insulation is achieved on the inner side of the first end cover while the internal strength is guaranteed; meanwhile, sub-parts such as internal insulation sheets and insulation foam are optimized, and assembling procedures are reduced. Specifically, the method for high-temperature vacuum infiltration integrated molding is the prior art, and may be to lay a layer of powdered glass fiber substrate 13 on the inner side surface of the first end cap 112, pour the epoxy resin 14, heat and stand in a vacuum state, so that the epoxy resin 14 is infiltrated into the glass fiber substrate 13 and is integrated with the first end cap 112.

The utility model discloses a preparation method of cylinder battery CTC block structure, including following step:

s1, arranging a plurality of cylindrical batteries 1 on a vehicle chassis 3 in a horizontal inner matrix, and welding a bus bar 2;

s2, coating structural adhesive in the embedded groove 30, and placing one side of the cylindrical battery 1 welded with the bus bar 2 in the embedded groove 30 and fixing the cylindrical battery with the embedded groove through the structural adhesive. Specifically, the cylindrical batteries 1 arranged in a matrix may be inverted and assembled in the vehicle chassis 3, or the vehicle chassis 3 may be inverted and assembled with the cylindrical batteries 1 arranged in a matrix.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A cylindrical battery CTC group structure comprises a plurality of cylindrical batteries (1), a plurality of bus bars (2), a vehicle chassis (3), an insulating layer (4) and a cabin bottom cover (5), wherein,

the cylindrical battery (1) comprises a shell (11) and a pole (12), the pole (12) is arranged on one end face of the shell (11), and the shell (11) and the pole (12) are respectively electrified and have opposite polarities; a plurality of cylindrical batteries (1) are arranged in a horizontal inner matrix on a vehicle chassis (3);

two ends of the bus bar (2) are respectively welded with the shells (11) or the poles (12) on different cylindrical batteries (1) and are electrically connected;

the method is characterized in that: the end, provided with the pole (12), of the cylindrical battery (1) is arranged downwards, a plurality of embedded grooves (30) which are matched with the end part of the downward side of the cylindrical battery (1) and the bus bar (2) in shape are formed in the surface of the vehicle chassis (3), and the end part of the downward side of the cylindrical battery (1) and the bus bar (2) are arranged in the embedded grooves (30) and fixed with the embedded grooves (30) through structural adhesive; an insulating layer (4) is laid on the upper surface of each cylindrical battery (1), and a cabin bottom cover (5) is buckled on the insulating layer (4) and is fixedly connected with a vehicle chassis (3).

2. The cylindrical battery CTC ganged structure of claim 1, wherein: casing (11) include cylinder (111), first end cover (112) and second end cover (113), cylinder (111) both ends opening, and first end cover (112), second end cover (113) set up respectively in cylinder (111) both ends opening part and welded fastening, are provided with utmost point post (12) in the middle of first end cover (112), and first end cover (112) are electrified respectively and polarity is opposite with utmost point post (12).

3. The cylindrical battery CTC ganged structure of claim 2, wherein: busbar (2) are including first weld part (21), second weld part (22) and intermediate junction portion (23), first weld part (21) and second weld part (22) are connected through intermediate junction portion (23), first weld part (21) and second weld part (22) are "C" shape respectively, and "C" shape opening is middle connection portion (23) dorsad, first weld part (21) and the laminating of utmost point post (12) terminal surface and the welded fastening of one of them cylindrical battery (1), second weld part (22) and the laminating of first end cover (112) terminal surface and the welded fastening of another cylindrical battery (1) that same row is adjacent, utmost point post (12) set up in second weld part (22) "C" shape.

4. The cylindrical battery CTC ganged structure of claim 3, wherein: the bus bar (2) further comprises a side connecting part (24) which is arranged on the side surface of the second welding part (22) and is selectively welded with the second welding part (22) of the adjacent bus bar (2) in the same row and electrically connected with the second welding part.

5. The cylindrical battery CTC ganged structure of claim 3, wherein: the first end cover (112) is provided with a liquid injection hole (10), and the liquid injection hole (10) is arranged at the C-shaped opening of the second welding part (22).

6. The cylindrical battery CTC ganged structure of claim 2, wherein: the cylindrical battery (1) further comprises an explosion-proof valve (110), wherein the explosion-proof valve (110) is an arc-shaped weak line which is arranged at the welding position of the second end cover (113) and the cylindrical barrel body (111) and faces below the horizontal plane.

7. The cylindrical battery CTC ganged structure of claim 6, wherein: insulating heat-conducting glue is filled between the cylindrical batteries (1) arranged in the matrix and between the cylindrical batteries (1) and the water cooling plate (8), and the filling height of the insulating heat-conducting glue is not more than that of the explosion-proof valve (110).

8. The cylindrical battery CTC ganged structure of claim 3, wherein: the first end cover (112) comprises a panel (1121), an inner plate (1122) and a plurality of connecting rings (1123) which are integrally formed, the panel (1121) and the inner plate (1122) are arranged in parallel, and the connecting rings (1123) are concentrically nested between the panel (1121) and the inner plate (1122).

9. The cylindrical battery CTC ganged structure of claim 8, wherein: a layer of glass fiber base material (13) and a layer of epoxy resin (14) are sequentially laid on the inner side surface of the inner plate (1122), and the glass fiber base material (13), the epoxy resin (14) and the inner plate (1122) are integrally formed through high-temperature vacuum infiltration.

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