CN219350374U - Single battery and electric vehicle - Google Patents

Abstract

The application relates to a single battery and an electric vehicle, wherein the single battery comprises a shell with an opening; the top cover is covered at the opening to form an accommodating space, and the top cover is provided with an accommodating cavity with a hollow inside; the battery cell is arranged in the accommodating space; and the heat dissipation part is arranged in the accommodating cavity. The single battery and the electric vehicle can ensure that the heat of the top cover is effectively discharged, so as to ensure the performance of the battery cell.

Description

Single battery and electric vehicle

Technical Field

The application relates to the field of batteries, in particular to a single battery and an electric vehicle.

Background

The lithium ion battery is widely applied to the fields of digital product batteries, new energy automobile batteries, power grid supply side energy storage and the like due to the characteristics of high energy density, long cycle life, low self discharge and the like. Particularly, the single battery of the aluminum shell battery is favored by wide vehicle enterprises and electric core factories because of higher single energy density. However, the battery is affected by temperature during use, which can have a significant effect on its performance, and even is prone to thermal runaway. In the prior art, water cooling or air cooling is generally arranged around the battery cell to cool, but the heat of the top cover is still higher, so that the heat cannot be effectively discharged, the performance of the battery cell is finally affected, and even the situation of thermal runaway of the battery cell occurs.

Disclosure of Invention

An object of the application is to provide a battery cell and electric vehicle, and this battery cell and electric vehicle can ensure the heat of top cap and effectively discharge to guarantee electric core performance.

To this end, in a first aspect, embodiments of the present application provide a single battery, including:

a housing having an opening;

the top cover is covered at the opening to form an accommodating space, and the top cover is provided with an accommodating cavity with a hollow inside;

the battery cell is arranged in the accommodating space; and

and the heat dissipation part is arranged in the accommodating cavity.

In a possible implementation, the top cover is provided with an inlet end and an outlet end communicating with the housing chamber, the inlet end and the outlet end being adapted to be connected to an external cooling device,

the heat dissipation part comprises a circulating pipeline arranged in the accommodating cavity, and two ends of the circulating pipeline are respectively communicated with the inlet end and the outlet end, or the accommodating cavity integrally forms a flow channel as the heat dissipation part.

In one possible implementation, the accommodating cavity is a square cavity structure arranged in the top cover, and the inlet end and the outlet end are diagonally arranged in the top cover relative to the accommodating cavity.

In one possible implementation, the circulation line is arranged in an S-shape in the receiving chamber.

In one possible implementation, the top cover is further provided with a mounting hole penetrating in the thickness direction, the mounting hole is communicated with the accommodating cavity,

when the accommodating cavity is provided with the circulating pipeline, the circulating pipeline is not intersected with the mounting hole in the projection in the thickness direction;

when the accommodating cavity integrally forms the flow channel, the top cover further comprises a side baffle plate, and the side baffle plate penetrates through the accommodating cavity to be connected with the inner side wall of the mounting hole so as to separate the mounting hole from the accommodating cavity.

In one possible implementation, the device further includes a pole, the pole is disposed in the mounting hole, the circulation pipe is disposed at a peripheral side of the pole, and a density of the circulation pipe is reduced in a direction away from the pole.

In one possible implementation, the top cover has a first surface in a thickness direction, the inlet end and the outlet end being flush with the first surface.

In one possible implementation, the inner wall of the receiving cavity is provided with an insulating layer.

In one possible implementation, the top cover comprises a first cover body and a second cover body which are detachably connected along the thickness direction, at least one of the first cover body and the second cover body is provided with a recess,

when the first cover body is matched with the second cover body, at least the concave is covered along the thickness direction, so that the concave is enclosed to form the accommodating cavity.

In a second aspect, embodiments of the present application provide an electric vehicle comprising a single cell as described in the foregoing.

According to the battery cell and the electric vehicle provided by the embodiment of the application, in the use process of the battery cell, the top cover is influenced by the temperature rise of the internal battery cell, the temperature is easily conducted to the aluminum top cover, and the heat of the top cover can be quickly and effectively discharged by arranging the hollow accommodating cavity inside the top cover and arranging the heat radiating part at the position corresponding to the accommodating cavity by utilizing the heat radiating part arranged inside the accommodating cavity. The mode that sets up the radiating portion in the inside of top cap not only can avoid taking up outer space and influencing the assembly of battery, also can effectually discharge heat simultaneously, ensures the performance of electric core, avoids appearing electric core thermal runaway's condition.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art. In addition, in the drawings, like parts are designated with like reference numerals and the drawings are not drawn to actual scale.

Fig. 1 shows a schematic overall structure of a single battery provided in an embodiment of the present application, where a direction indicated by an arrow H is a thickness direction and a direction indicated by an arrow L is a horizontal direction.

Fig. 2 shows a cross-sectional view of a single battery provided in an embodiment of the present application;

FIG. 3 shows a cross-sectional view of the top cover of FIG. 2;

fig. 4 is a top perspective view showing a state in which a top cover in a unit cell is not assembled, provided in an embodiment of the present application;

fig. 5 shows a top perspective view of a top cap in a single battery provided in an embodiment of the present application after assembly;

FIG. 6 illustrates a top perspective view of another assembled top cover in a single cell provided in accordance with an embodiment of the present application;

fig. 7 shows a top perspective view of a cap in yet another cell provided in an embodiment of the present application after assembly.

Reference numerals:

1-a housing; 11-accommodation space; 2-top cover; 21-a first surface; 211-a receiving cavity; 212-mounting holes; 212 a-a third hole; 212 b-a first hole; 212 c-a second hole; 22-a heat dissipation part; 221-an inlet end; 222-an outlet end; 223-a circulation line; 224-enclosed space; 23-explosion-proof valve; 24-a first pole; 25-second pole; 3-cell.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

Fig. 1 shows an overall structure schematic diagram of a single battery provided in an embodiment of the present application. Fig. 2 shows a cross-sectional view of a single battery provided in an embodiment of the present application. The direction indicated by the arrow H is a thickness direction, the direction indicated by the arrow L is a horizontal direction, and the thickness direction H intersects with the horizontal direction L, preferably, the thickness direction H is perpendicular to the horizontal direction L.

Referring to fig. 1 and 2, the unit cell includes a case 1, the case 1 has an opening, and a top cover 2 is covered at the opening of the case 1 to form an accommodating space 11 for accommodating the battery cell 3, thereby assembling the unit cell. The single battery can be directly used in fields with small energy requirements such as digital products. Or, the plurality of single batteries can be arranged, and the plurality of single batteries are assembled to form a battery pack, so that the battery pack can be used in the energy storage fields of new energy automobiles with larger energy demands, power grids and the like, and the battery pack is not particularly limited.

It can be understood that the single battery is an aluminum shell battery, and compared with other types of lithium ion batteries, the aluminum shell battery has the advantage of high single energy density, and is widely applied to new energy automobiles.

Referring to fig. 1 and 3, an embodiment of the present application provides a single battery, including a top cover 2, the top cover 2 is configured as a cover plate structure made of aluminum, and is used for covering an opening of a housing 1, and the top cover 2 is detachably connected with the housing 1, so as to be used for protecting an internal battery cell 3.

The top cover 2 has a hollow accommodating cavity 211, and further includes a heat dissipating portion 22, where the heat dissipating portion 22 is disposed in the accommodating cavity 211. During the charge and discharge process, the battery cell 3 releases large heat to expand, and even causes thermal runaway due to overheating. In this process, the top cover 2 is affected by the heat released by the battery cell 3, the aluminum top cover 2 easily absorbs and conducts heat to each position of the top cover 2, and the heat is affected by the characteristics and thickness of the top cover 2, so that the top cover 2 has obvious temperature rise, the heat on the top cover is difficult to be quickly dissipated, and finally the performance of the battery cell 3 is also affected. Therefore, the accommodating cavity 211 is provided in the top cover 2, and the heat dissipation portion 22 is provided in the accommodating cavity 211, so that the heat dissipation portion 22 can dissipate the heat of the top cover 2 in the circumferential direction, and the heat of the top cover 2 can be rapidly and effectively discharged. The mode that sets up the radiating portion 22 in the inside of top cap 2 not only can avoid taking up outer space and influencing the assembly of battery cell or form the battery package with the battery cell assembly, also can effectually discharge heat simultaneously, ensures the performance of electric core 3, avoids appearing the condition of electric core 3 thermal runaway.

It is to be understood that the heat dissipation portion 22 may be configured to dissipate heat through water cooling or air cooling, which is not particularly limited herein. The heat dissipation portion 22 disposed in the accommodating chamber 211 may be configured to perform a heat dissipation function alone, for example, a fan, or the like may be disposed in the accommodating chamber 211, or the heat dissipation portion 22 may be used as a heat exchange member, and the heat exchange member may be connected to a cooling device disposed outside to form a circulation loop by a refrigerant introduced from the cooling device, thereby dissipating heat from the top cover 2.

Optionally, the shape and size of the accommodating cavity 211 provided in the top cover 2 may be adaptively designed according to the actual heat dissipation requirement and the deformation resistance of the top cover 2 to be ensured, which is not limited herein. Preferably, the accommodating cavity 211 may be configured to match the shape of the top cover 2, such that the accommodating cavity 211 forms a square cavity structure, i.e., the top cover 2 forms a square housing. Through this kind of setting means for set up in the radiating portion 22 of inside can follow each direction and dispel the heat to top cap 2, with better realization to the heat dissipation of top cap 2, the radiating effect is better, and wherein, the lateral wall thickness of each direction of the casing that forms can be adjusted according to the demand adaptability, does not here give out details.

Referring to fig. 3 to 7, the specific structure of the top cover 2 according to the embodiment of the present application will be described in further detail with reference to the accompanying drawings. The heat dissipation part 22 is selected as a heat exchange member, and the outside thereof needs to be connected with a cooling device to realize cooling.

Referring to fig. 3, when the heat dissipating part 22 is used as a heat exchanging member, the top cover 2 is provided with an inlet 221 and an outlet 222 communicating with the accommodating chamber 211, and the inlet 221 and the outlet 222 are used to connect with an external cooling device to form a closed loop with which a refrigerant circulates to dissipate heat of the top cover 2. Alternatively, the cooling medium may be a cooling liquid, for example, water or other conductive or nonconductive liquid, or the cooling medium may be cold air, which is not limited herein.

In an alternative embodiment, the heat dissipation portion 22 includes a circulation pipe 223 disposed in the accommodating cavity 211, and two ends of the circulation pipe 223 are respectively connected to the inlet 221 and the outlet 222. By providing the circulation line 223 in the accommodating chamber 211, which is in communication with the inlet 221 and the outlet 222, the circulation line 223 and the cooling device are combined to form a closed loop, and the refrigerant can realize heat exchange with the top cover 2 when passing through the position of the circulation line 223. The circulation pipeline 223 arranged in the accommodating cavity 211 can simultaneously radiate heat at different positions of the top cover 2, so that the top cover 2 with a thin-wall structure formed by the accommodating cavity 211 can quickly achieve the purpose of cooling.

Alternatively, the circulation pipe 223 may be in contact with the inner wall of the accommodating cavity 211 of the top cover 2, or may be configured as a non-contact fit, or may be directly integrally formed with the top cover 2, which is not specifically limited herein. Preferably, the circulation line 223 is closer to the side where the battery cell 3 is disposed along the thickness direction H, or is in contact fit with the bottom wall on the side where the battery cell 3 is disposed, so as to achieve a better heat dissipation effect.

Optionally, the circulation line 223 disposed in the accommodating chamber 211 extends along the horizontal direction L, so that both ends are finally connected to the inlet end 221 and the outlet end 222, respectively. The circulation pipeline 223 is arranged to extend along the horizontal direction L, so that the heat dissipation area of the top cover 2 is increased, and the heat dissipation effect is better.

It will be appreciated that, referring to fig. 4 and 5, the horizontal direction L is perpendicular to the thickness direction H, and the horizontal direction L includes a transverse direction and a longitudinal direction perpendicular to each other, and the circulation line 223 may be disposed in the transverse direction or the longitudinal direction, and may be adaptively adjusted according to the specific shape of the accommodating cavity 211, which is not particularly limited herein.

Alternatively, referring to fig. 4 to 6, the circulation line 223 is disposed in the receiving chamber 211 in an S shape. The heat dissipation effect is improved by increasing the area of the pipe through the circulation pipe 223 arranged in an S shape. Also, it may be arranged in an S-shape in the lateral direction or in the longitudinal direction, and is not particularly limited herein.

In an alternative embodiment, referring to fig. 7, the accommodating chamber 211 integrally forms a flow passage as the heat radiating part 22, and the inlet end 221 and the outlet end 222 communicate with both ends of the flow passage, respectively. That is, the accommodating cavity 211 is provided as a closed space 224, only the inlet end 221 and the outlet end 222 are connected with the two ends of the cooling device, the closed space 224 integrally forms a flow channel, and the circulated refrigerant directly contacts with the inner wall of the top cover 2 in the accommodating cavity 211 to perform heat exchange, so that the cooling effect is better.

The present application further provides a specific embodiment, referring to fig. 1, the top cover 2 is provided with a connected pole and an explosion-proof valve 23, wherein the pole may include a first pole 24 and a second pole 25, one of the first pole 24 and the second pole 25 is electrically connected with the top cover 2, and the other is electrically connected with the top cover 2 in an insulating manner, so that the first pole 24 and the second pole 25 form a positive pole and a negative pole, respectively. When the first and second poles 24 and 25 penetrate the top cover 2 in the thickness direction H and the top cover 2 is covered on the opening of the case 1, one ends of the first and second poles 24 and 25 can be connected to electrode pads corresponding to the battery cells 3, and the other ends protrude from the top cover 2 to the outside for electrical connection with the outside.

Alternatively, the first pole 24 and the second pole 25 may be electrically or insulatively connected to the top cover 2 via an auxiliary connection assembly, and may include a variety of different implementations, which are not described in detail herein.

In the single battery, the heat of the battery core 3 is easily conducted to the top cover 2 through the pole, so that the temperature rise of the top cover 2 is high, and the heat is difficult to dissipate. Therefore, the heat dissipation part 22 is arranged in the accommodating cavity 211 of the top cover 2, so that the heat dissipation part 22 can dissipate heat of the top cover 2 and simultaneously further dissipate heat of the pole, thereby rapidly and effectively discharging heat of the top cover 2 and ensuring the performance of the battery cell 3.

In an alternative embodiment, referring to fig. 4 and 5, the top cover 2 is further provided with at least one mounting hole 212 penetrating the accommodating chamber 211 in the thickness direction H, and the mounting hole 212 communicates with the accommodating chamber 211. The mounting holes 212 include a plurality of mounting holes 212, and the shape and size of any mounting hole 212 may be the same or different, and the mounting holes 212 may be provided at positions corresponding to the first pole 24, the second pole 25, and the explosion-proof valve 23. That is, the mounting hole 212 includes a first hole 212b, a second hole 212c, and a third hole 212a, and the explosion-proof valve 23 is connected to the top cover 2 through the first hole 212b, and the first and second poles 24 and 25 are respectively connected to the top cover 2 through the second and third holes 212c and 212a to be electrically or insulatively connected thereto. The shape and size of the mounting hole 212 are adapted according to the first pole 24, the second pole 25 and the explosion-proof valve 23 which are correspondingly connected, and will not be described in detail herein.

Optionally, the mounting hole 212 may further include a fourth hole for providing a filling pipe to fill the internal cell 3 with liquid. The fourth hole may be in communication with the accommodating cavity 211, where the fourth hole is separately provided with a liquid injection pipe to avoid liquid flowing into the accommodating cavity 211, or the fourth hole may be disposed at a position of the top cover 2 where the accommodating cavity 211 is not provided, that is, the fourth hole is not in communication with the accommodating cavity 211, and the fourth hole directly serves as the liquid injection pipe to inject liquid into the internal cell 3, which is not particularly limited herein.

It should be emphasized that, when the mounting hole 212 is configured to communicate with the accommodating cavity 211, the first pole 24, the second pole 25 and the explosion-proof valve 23 may be connected with the top cover 2 in a sealing manner through the assembled auxiliary connection assembly during the assembly process, that is, the positions of the side wall of the top cover 2 corresponding to the mounting hole 212 are respectively connected with the corresponding first pole 24, second pole 25 and explosion-proof valve 23 in a sealing manner, which will not be described in detail herein.

In an alternative embodiment, when the accommodation chamber 211 is provided with the circulation duct 223, the circulation duct 223 does not intersect with the mounting hole 212 in the projection in the thickness direction H. So that when the pole, the explosion-proof valve 23, etc. are attached to the top cover 2 through the attachment holes 212, a part of the structure can protrude from both sides in the thickness direction H of the top cover 2. And to the structure that part is located the accommodation chamber 211, the circulation pipeline 223 that sets up need dodge to when avoiding influencing the assembly effect, can dispel the heat to utmost point post, explosion-proof valve 23 etc..

In an alternative embodiment, when the accommodating chamber 211 integrally forms the flow channel, the top cover 2 further includes a side baffle plate connected to the inner sidewall of the mounting hole 212 through the accommodating chamber 211 so as to separate the mounting hole 212 from the accommodating chamber 211. The accommodating cavity 211 provided with the mounting hole 212 forms a closed space 224 through the side baffle plates, and the side baffle plates are enclosed to form an avoidance area for assembling the pole, the explosion-proof valve 23 and other components.

It is to be understood that, when the circulation pipe 223 is disposed in the accommodating cavity 211, the side baffle structure described above may also be disposed, so as to avoid the leakage of the circulation pipe 223 from directly acting on the electrode communicated with the interior, thereby improving the safety performance, which is not limited herein.

In an alternative embodiment, referring to fig. 4 and 5, in order to ensure that the circulation pipe 223 has a better heat dissipation effect on the top cover 2, the circulation pipe 223 is disposed at the circumferential side of the pole, and the density of the circulation pipe 223 is reduced in a direction away from the pole. Through arranging the circulation pipeline 223 that density is higher around the utmost point post, make the radiating effect that is close to the higher position of temperature rise such as utmost point post, explosion-proof valve 23 in the top cap 2 better, make this part can realize radiating to top cap 2, also can dispel the heat to the utmost point post to better carry out temperature regulation to electric core 3.

Alternatively, the circulation line 223 is arranged at the circumferential side of the pole, and the density of the circulation line 223 is decreased in a direction away from the pole. In general, the polar posts include a first polar post 24 and a second polar post 25 which are arranged at intervals, and an explosion-proof valve 23 is arranged between the first polar post 24 and the second polar post 25, and the whole area range where the three are located is used as the range close to the polar post, so that the density of a circulation pipeline 223 arranged in the range is higher than that of other positions of the accommodating cavity 211, and the polar post, the explosion-proof valve 23 and the like with higher temperature rise have better heat dissipation effect. It is understood that the set range may be adaptively adjusted according to specific conditions such as the temperature rise of the pole, the explosion-proof valve 23, and the like, and is not particularly limited herein.

It should be emphasized here that, as for the density of the arrangement of the circulation line 223, it means that the circulation line 223 covers the duty ratio of the unit area, and the heat exchange efficiency of the circulation line 223 in the unit area is improved by increasing the density, so that a better cooling effect is achieved. The circulation pipes 223 disposed in a unit area may be uniformly disposed or non-uniformly disposed, and are not particularly limited herein.

In an alternative embodiment, the inner side wall of the accommodating chamber 211 is provided with an insulating layer. No matter what structure the heat dissipating part 22 is provided with, an insulating layer may be disposed on the inner side wall of the accommodating cavity 211 to avoid leakage of the circulation pipeline 223 or the flow channel formed by the sealed accommodating cavity 211, so as to lead to conduction of other conductive refrigerants such as water and the like with the positive and negative electrodes and form a short circuit.

In an alternative embodiment, referring to fig. 6 and 7, when the accommodating cavity 211 is configured as a square cavity, the inlet 221 and the outlet 222 ends are diagonally disposed on the top cover 2 with respect to the accommodating cavity 211. The inlet 221 and the outlet 222 serve as an input and an output which are communicated with the external cooling device, and whether the heat dissipating part 22 is a circulation pipeline 223 or the accommodating cavity 211 is directly used as a flow channel, the farther the relative distance between the input and the output is arranged on the top cover 2, the more favorable the heat dissipating effect is, and the more favorable the circulation pipeline 223 is arranged, so that the diagonal arrangement of the inlet 221 and the outlet 222 serves as an arrangement form for improving heat exchange, and will not be described in detail herein.

Alternatively, the inlet 221 and outlet 222 may be disposed opposite to each other in the horizontal direction L in the lateral direction or the longitudinal direction, which is not particularly limited herein.

It will be appreciated that the cap 2 has a first surface 21 remote from the side of the housing 1, and that the explosion proof valve 23, pole etc. will have some structure protruding from the first surface 21 after assembly to the cap 2. The inlet end 221 and the outlet end 222 may be provided in a structure of inlet pipes and outlet pipes protruding from the first surface 21 in the thickness direction H, or may be provided in a structure flush with the first surface 21, and are not particularly limited herein. When the inlet port 221 and the outlet port 222 are provided in a pipe structure protruding from the first surface 21, the height of the inlet port 221 and the outlet port 222 protruding from the first surface 21 is a first height, and the smallest height of the first pole 24, the second pole 25, and the explosion-proof valve 23 protruding from the first surface 21 is a second height, which is smaller than the second height, in the thickness direction H. So as to avoid interference when assembled into a battery module or a battery pack.

Optionally, the top cover 2 includes a first cover body and a second cover body detachably connected along a thickness direction H, at least one of the first cover body and the second cover body is provided with a recess, and when the first cover body and the second cover body are matched, the recess is at least covered along the thickness direction H so as to enclose the recess to form the accommodating cavity 211.

The embodiment of the application further provides an electric vehicle, which may be, for example, a new energy automobile, and is provided with a battery pack, where the battery pack is assembled by a plurality of unit batteries in a certain manner, and the unit batteries are the unit batteries described in the above embodiment, and are not described in detail herein.

It should be noted that, the single battery provided in the embodiment of the present application is not limited to be applied to a new energy automobile, but may be applied to other devices needing energy storage, such as a power grid, an energy storage cabinet, and the like, which are not described again.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense such that "on … …" means not only "directly on something", but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).

Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A single cell, characterized by comprising:

a housing having an opening;

the top cover is covered at the opening to form an accommodating space, and the top cover is provided with an accommodating cavity with a hollow inside;

the battery cell is arranged in the accommodating space; and

and the heat dissipation part is arranged in the accommodating cavity.

2. The unit cell according to claim 1, wherein the top cover is provided with an inlet end and an outlet end communicating with the accommodation chamber, the inlet end and the outlet end being for connection to an external cooling device,

the heat dissipation part comprises a circulating pipeline arranged in the accommodating cavity, and two ends of the circulating pipeline are respectively communicated with the inlet end and the outlet end, or the accommodating cavity integrally forms a flow channel as the heat dissipation part.

3. The cell of claim 2, wherein the receiving cavity is a square cavity structure disposed in the top cover, and the inlet end and the outlet end are disposed diagonally to the top cover with respect to the receiving cavity.

4. The unit cell according to claim 2, wherein the circulation line is disposed in the accommodation chamber in an S shape.

5. The unit cell according to claim 2, wherein the top cover is further provided with a mounting hole penetrating in a thickness direction, the mounting hole being in communication with the accommodation chamber,

when the accommodating cavity is provided with the circulating pipeline, the circulating pipeline is not intersected with the mounting hole in the projection in the thickness direction;

when the accommodating cavity integrally forms the flow channel, the top cover further comprises a side baffle plate, and the side baffle plate penetrates through the accommodating cavity to be connected with the inner side wall of the mounting hole so as to separate the mounting hole from the accommodating cavity.

6. The unit cell according to claim 5, further comprising a pole, the pole being provided to the mounting hole, the circulation pipe being arranged at a peripheral side of the pole, and a density of the circulation pipe being arranged to decrease in a direction away from the pole.

7. The unit cell according to any one of claims 2-6, wherein the top cover has a first surface in a thickness direction, and the inlet end and the outlet end are flush with the first surface.

8. The unit cell according to any one of claims 1-6, wherein an insulating layer is provided on an inner wall of the accommodation chamber.

9. The unit cell according to any one of claims 1 to 6, wherein the top cover comprises a first cover body and a second cover body detachably connected in a thickness direction, at least one of the first cover body and the second cover body is provided with a recess,

when the first cover body is matched with the second cover body, at least the concave is covered along the thickness direction, so that the concave is enclosed to form the accommodating cavity.

10. An electric vehicle comprising the single cell according to any one of claims 1 to 9.

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