CN217562756U

CN217562756U - Battery cell unit and assembly

Info

Publication number: CN217562756U
Application number: CN202221090579.1U
Authority: CN
Inventors: 李斯蓉; 王冬友; 马天媛; 吕宝峰
Original assignee: Volkswagen Automotive Co ltd
Current assignee: Volkswagen Automotive Co ltd
Priority date: 2022-05-07
Filing date: 2022-05-07
Publication date: 2022-10-11
Anticipated expiration: 2032-05-07

Abstract

The utility model provides an electricity core unit and assembly, electricity core unit includes: a body having a six-sided box-shaped structure, wherein the body includes two end plates located at left and right sides of the body, two side plates located at front and rear sides of the body, and upper and lower plates located at upper and lower sides of the body; the pole post assembly is positioned on the end plate; and an explosion-proof assembly comprising at least one explosion-proof valve disposed on at least one side plate; wherein the explosion-proof valve is spaced apart from the pole assembly by a predetermined distance. Compared with the mode that the explosion-proof valve is arranged on the end plate, the battery cell unit provided by the utility model reduces the probability of short connection between the pole component and the electric conductor; compared with the mode that the explosion-proof valves are arranged on the upper plate and the lower plate, the air flow in the battery cell unit is smoother, the area of the side plate is larger, and the explosion-proof valves are easier to arrange; and the medium in the battery cell unit can not be concentrated and accumulated when being released, so that the reliability and the stability of the battery cell unit in the aspect of explosion prevention are improved.

Description

Battery cell unit and assembly

Technical Field

The utility model belongs to the technical field of automobile-used battery design and specifically relates to an electricity core unit and assembly are related to.

Background

The new energy market of present lithium cell develops rapidly, and the lithium cell is mainly used square shell electricity core, cylinder electricity core and laminate polymer battery core in the market, and square shell electricity core has the advantage because its structural strength is big, and is efficient in groups, and the electric core structure as lithium ion has, and the side of this square shell electricity core competes and receives the imitation of each big battery factory.

In the electric core structure of prior art, because the lithium cell can produce a large amount of mist and liquid in the charge-discharge process, the pressure that constantly gathers in addition that accompanies, under the too big condition of electric core internal pressure, explosion-proof valve can be opened automatically to begin to let out the valve and reduce intracavity pressure rapidly, in order to prevent the concentrated condition that produces the explosion of heat. However, after the valve is released, a large amount of gas and fluid media (chemical substances) are released from the explosion-proof valve, and at the moment, the media extruded with high pressure easily flow and cover the cell pole, so that the pole and the pole or other electric conductors are in short circuit, and serious potential safety hazards are brought. In addition, in the use process of the square-shell battery cell, two narrow surfaces are generally positioned in the upper and lower directions, while the explosion-proof mode through the upper and lower surfaces, the left and right surfaces is common in the prior art, and the explosion-proof mode is not favorable for the smoothness of air flow circulation in the battery cell on one hand; on the other hand, because explosion-proof valve and utmost point post setting position are closer, can increase and let out the valve after, lead to between the utmost point post or with the probability of short circuit between other electric conductors.

In view of this, the present application is specifically made.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electricity core unit and assembly to there is unreasonable problem in solving current explosion-proof valve setting.

The utility model discloses the first aspect provides an electricity core unit, and electricity core unit includes: a body having a six-sided box-shaped structure, wherein the body includes two end plates located at left and right sides of the body, two side plates located at front and rear sides of the body, and upper and lower plates located at upper and lower sides of the body; the pole post assembly is positioned on the end plate; and an explosion-proof assembly comprising at least one explosion-proof valve disposed on at least one side plate; wherein the explosion-proof valve is spaced apart from the pole assembly by a predetermined distance.

Preferably, the explosion-proof valve is a plurality of and is arranged on the two side plates.

Preferably, the explosion-proof valve is located in a central region of the side plate.

Preferably, the pole assembly includes a first electrode terminal and a second electrode terminal having opposite polarities, and the first electrode terminal and the second electrode terminal are disposed on the same end plate of the body or disposed on two end plates of the body, respectively.

Preferably, the body comprises an integrated middle frame, the middle frame is of a frame-shaped structure and comprises two end plates, an upper plate and a lower plate, and the pole assembly is integrally connected to the middle frame.

Preferably, the body comprises a first side plate and a second side plate which are positioned at the front and the back of the body and arranged on the middle frame, and the first side plate and the second side plate are respectively packaged on the front opening and the back opening of the middle frame, so that the first side plate, the second side plate and the middle frame form a six-sided box-shaped structure.

Preferably, the first electrode terminal includes a first pressing plate, a first mounting plate and a first connecting body, the first connecting body includes a conductor rivet and a sealing ring, the conductor rivet includes a nail portion and a cap portion, the sealing ring is disposed on the periphery of the cap portion, the first pressing plate, the first mounting plate and the end plate are respectively provided with a first through hole corresponding to the nail portion, a second through hole and a pole post hole, the nail portion passes through the pole post hole, the second through hole and the first through hole extend to the outer surface of the first pressing plate to protrude to form a pole post, the cap portion is coupled to a battery cell disposed inside the body, the second electrode terminal includes a second pressing plate, a second mounting plate and a second connecting body, wherein one of the first mounting plate and the second mounting plate is a positive electrode weak guide plate, and the other is a negative electrode insulating plate.

Preferably, the battery cell unit further includes a liquid injection hole structure, and the liquid injection hole structure is provided on any one of the middle frame, the first side plate, and the second side plate.

Preferably, the battery cell unit further comprises a locking structure and an adapter sheet positioned on the inner side of the locking structure, the locking structure is arranged on the inner side of the end plate and provided with a fixing hole, the locking structure is used for limiting the battery cell, the adapter sheet is connected with the battery cell, and the cap part penetrates through the fixing hole and is connected with the adapter sheet.

The utility model discloses the second aspect provides an electricity core assembly, including a plurality of above electric core units and with be provided with the communicating exhaust channel of curb plate of explosion-proof valve.

Preferably, the battery cell assembly comprises a plurality of battery cell unit groups arranged in an array and a box frame integrating the battery cell unit groups; each battery cell unit group comprises two battery cell units which are arranged in parallel and have gaps, and two opposite side plates of the two battery cell units are not provided with an explosion-proof valve; the smoke exhaust channel is arranged on the box body frame.

To sum up, in the utility model provides an among the electric core unit, through set up utmost point post subassembly in end plate department, simultaneously with at least one explosion-proof valve alone set up on a curb plate or set up the design on two curb plates respectively, change traditional technique in, the mode of explosion-proof valve setting at end plate or upper plate or hypoplastron. In the application process of the battery cell unit, the explosion-proof valves are arranged in front of and behind the body of the battery cell unit.

Compared with the mode that the explosion-proof valve is arranged on the end plate in the prior art, the probability of short circuit of the pole assembly and the electric conductor is reduced; compare with the mode that explosion-proof valve set up at the upper plate and hypoplastron among the prior art, it is in the application, and the inside air current of electric core unit can be more smooth, and the area of curb plate is great, realizes setting up explosion-proof valve more easily. In addition, the application scene of electric core unit is combined, the setting mode of the explosion-proof valve of this application for the inside medium of electric core unit can not concentrate when releasing and pile up, improves electric core unit reliability and stability in the aspect of explosion-proof.

Additional features and advantages of embodiments of the present invention will be described in the detailed description which follows.

Drawings

The features, advantages and technical and industrial significance of the exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals indicate like elements, and wherein:

fig. 1a is an isometric schematic view of a cell unit according to an exemplary embodiment of the present invention;

fig. 1b is a left side view of a cell unit according to this exemplary embodiment of the present invention;

fig. 1c is a top view of a cell unit according to this exemplary embodiment of the present invention;

fig. 1d is a left side view of a cell unit according to a variation of this example embodiment of the invention;

fig. 2 is an exploded schematic view of a cell unit according to the exemplary embodiment of the present invention;

fig. 3a is an exploded schematic view of a structure at an end plate of a middle frame of a cell unit according to the present exemplary embodiment of the present invention;

fig. 3b is an exploded schematic view of the pole assembly according to this exemplary embodiment of the present invention; and

fig. 3c is a cross-sectional view of a cell unit according to this exemplary embodiment of the present invention at a center frame in an assembled state;

fig. 4 is a top view of a cell assembly according to an exemplary embodiment of the present invention.

100. A cell unit; 200. An electric core;

10. a pole assembly; 20. A body;

30. an explosion-proof assembly; 40. A liquid injection hole structure;

50. a stop structure; 60. A patch;

101. a first electrode terminal; 102. A second electrode terminal;

201. a first side plate; 202. A middle frame;

203. a second side plate; 301. An explosion-proof valve;

501. a stopper frame; 502. Buckling;

1011. a first platen; 1012. A first mounting plate;

1013. a first connecting body; 2021. A pole hole;

5011. mounting holes; 5012. A fixing hole;

1012a, a second through hole; 1011a, a first through hole;

1013a, a conductor rivet; 1013b, a sealing ring;

1000. a battery cell assembly; 21. A tab;

1002. an outlet end; 1001. An inlet end;

1003. a smoke exhaust channel.

Detailed Description

In order to make the above and other features and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings. It is understood that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting.

The utility model provides an electricity core unit 100, this electricity core unit 100 is arranged in the automobile-used battery. A cell unit 100 according to an exemplary embodiment of the present invention is described below with reference to fig. 1 a-2. Fig. 1a shows a schematic axial side view of a battery cell unit 100 according to an exemplary embodiment of the present invention; fig. 1b is a left side view of the battery cell unit 100 according to the present exemplary embodiment of the present invention; fig. 1c is a top view of the battery cell unit 100 according to the present exemplary embodiment of the present invention.

The cell unit 100 provided in this embodiment is a square cell. The battery cell unit 100 includes a pole assembly 10, a body 20 and an explosion-proof assembly 30, wherein the pole assembly 10 and the explosion-proof assembly 30 are fixed on the body 20.

The body 20 has a six-sided box-shaped structure as shown in fig. 1 a. For convenience of explanation, the body 20 is defined in the present embodiment to include two end plates located at the left and right of the body 20 and upper and lower plates located above and below the body 20; two side plates located at the front and rear of the body 20.

The orientation of the end plate provided with the pole assembly 10, visible in fig. 1a, is defined as "left", and the orientation of the other components is defined with reference to the orientation of this front-located end plate. That is, the end plates intersect the length direction of the body 20, and the side plates intersect the height direction and/or width direction of the body 20. The body 20 may be made of any one of aluminum and steel, and preferably, aluminum for light weight design.

In the present embodiment, as shown in fig. 1b and 1c, the pole assembly 10 includes a first electrode terminal 101 and a second electrode terminal 102, wherein the polarities of the first electrode terminal 101 and the second electrode terminal 102 are opposite, i.e., one is a positive terminal and one is a negative terminal, and the first electrode terminal 101 and the second electrode terminal 102 are respectively disposed on the two end plates of the body 20. Specifically, the first electrode terminal 101 is disposed on a central region of the left end plate, and the second electrode terminal 102 is disposed on a central region of the right end plate.

The first electrode terminal 101 and the second electrode terminal 102 are respectively provided on different end plates to have advantages in that: the risk of short circuit of the first electrode terminal 101 and the second electrode terminal 102 can be reduced, and in addition, because each end plate has only one electrode terminal, a larger space can be reserved in the height direction, so that the relatively wide tab 21 (refer to fig. 2) can be reserved in the internal battery cell 200, and the overcurrent capacity of the tab 21 is increased.

It is understood that, although it is preferable to dispose the first electrode terminal 101 and the second electrode terminal 102 at the central regions of the left and right end plates, respectively, it is not necessary.

Alternatively, as shown in fig. 1d, the first electrode terminal 101 and the second electrode terminal 102 may be disposed on the same end plate of the body 20, and the first electrode terminal 101 and the second electrode terminal 102 are disposed in parallel on the same end plate, which is a form in which the overall length of the cell unit 100 may be reduced, so that more cell units 100 may be accommodated in the same space during assembly to increase the battery capacity.

In addition, in the present embodiment, the explosion-proof assembly 30 includes two explosion-proof valves 301, the explosion-proof valves 301 are respectively located on two side plates (the first side plate 201 and the second side plate 203) in front and at back of the body 20, wherein the explosion-proof valve 301 arranged on the first side plate 201 (i.e. the opposite plate of the side plate provided with the explosion-proof valve 301 in fig. 1 a) is not shown in the figure.

More specifically, two explosion-proof valves 301 are provided in a central region of the first side plate 201 and the second side plate 203 in a manner facing each other. It can be understood that in this arrangement, the direction of the explosion-proof valve 301 and the direction of the pole assembly 10 have a certain angle and a certain distance, so that the insulation and arc discharge can be effectively achieved; the explosion proof valve 301 is located on the side plates of the body 20 in a manner facing each other, so that the release of the internal pressure can be better balanced.

It should be understood that, no matter how many the explosion-proof valves 301 are arranged and the division manner of the first side plate 201 and the second side plate 203 is selected, in a preferred arrangement manner, the explosion-proof valves 301 are arranged in the central area, and the predetermined distance between each explosion-proof valve 301 and the pole assembly 10 further increases the safety factor of the battery cell unit 100.

Of course, it is understood that it is preferable, but not necessary, that the explosion-proof valve 301 is disposed at a central region of the respective side plate, as long as the explosion-proof valve 301 is spaced apart from the pole assembly 10 by a predetermined distance. Here, "predetermined distance" refers to a distance: the distance between the explosion-proof valve 301 provided on the side plate and the pole assembly 10 provided on the end plate can be such that: in the case of the valve leakage of the battery cell unit 100, the medium in the battery cell unit 100 is prevented from pouring and then being concentrated and accumulated to cause the short circuit between the pole assemblies 10 or with other electric conductors, so that the reliability, safety and stability of the battery cell unit 100 are improved.

In some embodiments, for one battery cell unit 100, only one explosion-proof valve 301 needs to be disposed on one of the first side plate 201 or the second side plate 203. Specifically, in some application scenarios, at least two battery cell units 100 may be combined and arranged, for example, the surfaces of the battery cell units 100 not provided with the explosion-proof valve 301 may be arranged, so that a setting mode similar to the setting mode in which the explosion-proof valve 301 is arranged on the side plate farther than another battery cell unit 100 is realized, and the setting mode is very favorable for starting from the integrity and dredging the airflow; and is favorable for saving the layout space of the battery in the automobile.

Alternatively, the explosion-proof assembly 30 may also include only two or more explosion-proof valves 301 disposed on the same side plate, and preferably the explosion-proof valves 301 are disposed in different orientations between and further from the pole assembly 10.

Fig. 2 is an exploded schematic view of the battery cell unit 100 according to the present exemplary embodiment of the present invention. The body 20 of the present embodiment will be described in more detail with reference to fig. 2.

The body 20 includes a middle frame 202 and first and

second side panels

201 and 203. The middle frame 202 is a frame-shaped structure and includes two end plates and upper and lower plates located above and below the body 20, that is, the middle frame 202 has a structure that is open in the front and rear and is enclosed on the periphery.

The first side plate 201 and the second side plate 203 serve as the two side plates located at the front and rear of the body 20 as described earlier. The first side plate 201 and the second side plate 203 are respectively packaged on the front and rear openings of the middle frame 202, so that the first side plate 201, the second side plate 203 and the middle frame 202 form the aforementioned six-sided box-shaped structure.

The cell unit 100 further includes a battery cell 200, and the battery cell 200 is disposed inside the body 20 and has tabs 21. The battery cell 200 is coupled inside the body 20 by the tab 21 and the pole assembly 10, which will be described in detail below.

Preferably, the two end plates and the upper and lower plates of the middle frame 202 are integrated, i.e., the middle frame 202 is formed by bending an integral elongated plate. More preferably, the pole assembly 10 is integrally connected to the center frame 202. Specifically, after the long metal plate is cut, a long metal plate is obtained, after punch forming, the pole assembly 10 is welded in a preset fixing area, then the metal plate is bent through a bending machine to form a frame structure, and finally laser welding is performed at the butt joint positions of the two ends, so that the integrated middle frame 202 with the pole assembly 10 is formed.

It can be understood that the polar post assembly 10 is assembled on the aluminum plate in a flat plate shape, so that the fixation and the positioning in the processing are facilitated, and the process efficiency and the yield can be greatly improved.

Similarly, the first side plate 201 and the second side plate 203 are also of a single-plate structure, and the explosion-proof valve 301 can be directly machined and formed on the first side plate 201 and the second side plate 203 before assembly.

The battery cell 100 may further include a liquid injection hole structure 40, and the liquid injection hole structure 40 may be disposed on an end plate (as shown in the figures) or a side plate of the body 20 for injecting liquid into the body 20.

Fig. 3a is an exploded schematic view of a structure at an end plate of the middle frame 202 of the battery cell unit 100 according to the present exemplary embodiment of the present invention; fig. 3b is an exploded schematic view of the pole assembly 10 according to this exemplary embodiment of the present invention; fig. 3c is a cross-sectional view of the cell unit 100 according to this exemplary embodiment of the present invention at the middle frame 202 in an assembled state. The relevant structure at the end plate of the middle frame 202 will be described in detail below in connection with fig. 3 a-3 c.

The first electrode terminal 101 includes a first pressing plate 1011, a first mounting plate 1012, and a first connecting body 1013, wherein the first mounting plate 1012 has a box shape with an open side, and the first pressing plate 1011 can be placed in the first mounting plate 1012 to be connected to the first mounting plate 1012. The first connecting body 1013 includes a conductor rivet 1013a and a seal ring 1013b, the conductor rivet 1013a includes a nail portion and a cap portion, and the seal ring 1013b is provided on the outer periphery of the cap portion. The first pressing plate 1011 and the first mounting plate 1012 are provided with a first through hole 1011a and a second through hole 1012a, respectively, corresponding to the nail portion of the conductor rivet 1013 a. The battery cell unit 100 further includes a stopper structure 50, and the stopper structure 50 includes a stopper frame 501 and a catch 502. The stopper frame 501 is disposed inside the end plate of the middle frame 202, and is closely fitted and fixed to the end plate of the middle frame 202. The stopper frame 501 is provided with a mounting hole 5011 extending in the height direction, and the clip 502 is attached to one side of the stopper frame 501 through the mounting hole 5011. After the battery cell 200 is placed inside the middle frame 202, the buckle 502 limits the degree of freedom of the battery cell 200 in the relative height direction.

The stop bracket 501 is provided with a fixing hole 5012, and the fixing hole 5012 is matched with the sealing ring 1013 b. The end plate of the middle frame 202 is provided with a pole hole 2021, and the pole hole 2021 is matched with the nail part of the conductor rivet 1013 a. The battery cell unit 100 further includes an adaptor sheet 60, and the adaptor sheet 60 is disposed at one side of the fixing hole 5012 deviating from the pole assembly 10.

The nail of the conductor rivet 1013a passes through the pole hole 2021, the second through hole 1012a, and the first through hole 1011a, and extends to the outer surface of the first pressing plate 1011 to form a protruding pole. The cap and the peripheral sealing ring 1013b are in interference fit with the fixing hole 5012 of the stop frame 501, and the cap protrudes a certain distance in the direction of the battery cell 200 and is connected with the adaptor 60, while the battery cell 200 is connected with the adaptor 60 via the tab 21 (see fig. 2), so as to realize the coupling between the battery cell 200 and the pole assembly 10.

Similarly, the second electrode terminal 102 includes a second pressing plate, a second mounting plate and a second connecting body (the components are not shown in the figure), wherein the first mounting plate 1012 and the second mounting plate are a positive electrode weak conducting plate and a negative electrode insulating plate respectively.

The cell unit 100 further includes an insulating film (not shown) that is fixed to a surface of the battery cell 200 to provide insulation protection for the battery cell 200.

Preferably, in the manufacturing process of the cell unit 100, the cell 200 may be covered with an insulating film, then the cell 200 is welded to the adaptor sheet 60, then the cell 200 with the adaptor sheet 60 is placed in the middle frame 202 with the pole assembly 10, and then the first side plate 201 and the second side plate 203, which may be provided with the explosion-proof valve 301 separately or simultaneously, are assembled to the middle frame 202.

Referring to fig. 4, fig. 4 is a top view of a cell assembly 1000 according to an exemplary embodiment of the present invention; the utility model discloses still relate to an electricity core assembly 1000, form by the encapsulation of a plurality of foretell electric core units 100.

Specifically, the cell assembly 1000 includes a housing cavity for packaging the cell units 100, the housing cavity is provided with a plurality of exhaust channels 1003 arranged in the horizontal direction, and an inlet port 1001 and an outlet port 1002 communicated with the exhaust channels 1003, the cell units 100 are arranged between the exhaust channels 1003, each cell unit 100 is vertically placed upwards with a smaller side plate (i.e., the upper plate described in the foregoing) (refer to fig. 1 a), the pole assemblies 10 of the end plates of the cell units 100 are connected in series in a butt joint manner, and are arranged in a rectangular array manner to house more cell units 100, so that the cell assembly 1000 has higher capacity.

Further, the explosion-proof valve 301 on at least one of the first side plate 201 or the second side plate 203 of the cell unit 100 is communicated with the exhaust passage 1003, an air passage in the horizontal direction is formed from the inlet end 1001 to the outlet end 1002, and gas and fluid medium in the cell unit 100 are released through the exhaust passage 1003 after being released at the explosion-proof valve 301, so that the exhaust passage 1003 can release the fluid medium or gas in the cell unit 100 in the horizontal direction, and compared with a mode of releasing in the vertical direction (such as arranging the explosion-proof valve 301 on one or more plates of the middle frame 202), accumulation and short circuit phenomena are not easy to occur, so that the safety factor of the whole cell assembly 1000 after valve release is increased.

In an optional scheme, the battery cell assembly 1000 includes a plurality of battery cell unit sets arranged in an array and a box frame integrating the battery cell unit sets. The box frame has the function of accommodating all the battery cell unit groups, and the exhaust channel 1003 is arranged on the box frame.

In the battery cell units 100, one side plate is provided with an explosion-proof valve 301, and each battery cell unit group comprises two battery cell units 100 which are arranged in parallel and have a gap; one smoke exhaust channel 1003 may be adjacently disposed with two rows of cell unit groups connected in series in sequence (i.e., in each row, a plurality of cell unit groups are connected in series). The side plate of the cell unit 100 provided with the explosion-proof valve 301 is communicated with the smoke exhaust channel 1003, the side plate without the explosion-proof valve 301 is arranged oppositely, so that the space on the width can be saved, and meanwhile, each cell unit 100 is communicated with the smoke exhaust channel 1003, so that the safety of a single cell unit 100 is ensured.

In addition, the arrangement mode realizes the front and back explosion-proof modes of the battery cell unit 100, and compared with the traditional explosion-proof mode in the vertical direction (upper and lower plates), the explosion-proof mode does not need to additionally increase the height, only the space is reserved on the front and back surfaces of the battery cell unit 100, so that the space is saved, and the explosion-proof mode is easy to realize.

The above only explains the case that the explosion-proof valves 301 are arranged on only one side plate of the battery cell unit 100, and similarly, the number of the explosion-proof valves 301 of the battery cell unit 100 may also be changed, and as mentioned above, the battery cell unit 100 may include two explosion-proof valves 301, and the two explosion-proof valves 301 are respectively and individually located on the same side plate; or three explosion-proof valves 301 are included, the three explosion-proof valves 301 are respectively and independently located on the same side plate, or other numbers of explosion-proof valves 301 can be set, as long as the smoke exhaust channel 1003 and the side face provided with the explosion-proof valve 301 are communicated.

In the above manner, the communicating part between the side plate of the electrical core unit 100 provided with the explosion-proof valve 301 and the smoke exhaust channel 1003 needs to reserve a release space, so that the medium of the explosion-proof valve 301 is released when the electrical core unit is out of control, and the space also needs to be reserved between the side plate of the electrical core unit 100 not provided with the explosion-proof valve 301 and another electrical core unit 100, thereby avoiding the possibility of potential risk caused by too concentrated heat of the electrical core unit 100.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A cell unit, comprising:

a body having a six-sided box-shaped structure, wherein the body includes two end plates located at left and right sides of the body, two side plates located at front and rear sides of the body, and upper and lower plates located above and below the body;

the pole post assembly is positioned on the end plate; and

an explosion-proof assembly comprising at least one explosion-proof valve disposed on at least one of said side plates;

wherein the explosion proof valve is spaced apart from the post assembly by a predetermined distance.

2. The battery cell unit of claim 1, wherein the explosion-proof valve is multiple and is distributed on two side plates.

3. The cell unit of claim 1, wherein the explosion-proof valve is located in a central region of the side plate.

4. The cell unit of claim 3, wherein the pole assembly comprises first and second electrode terminals of opposite polarity disposed on the same end plate of the body or on two end plates of the body, respectively.

5. The cell unit of any one of claims 1 to 4, wherein the body comprises an integral middle frame, the middle frame is a frame-shaped structure and comprises two end plates, the upper plate and the lower plate, and the pole assembly is integrally connected to the middle frame.

6. The cell unit of claim 5, wherein the body comprises a first side plate and a second side plate located at the front and the rear of the body and disposed on the middle frame, and the first side plate and the second side plate are respectively encapsulated on the front opening and the rear opening of the middle frame, so that the first side plate, the second side plate and the middle frame form the six-sided box-shaped structure.

7. The cell unit of claim 4, wherein the first electrode terminal comprises a first pressure plate, a first mounting plate, and a first connecting body, the first connecting body comprising a conductor rivet comprising a nail portion and a cap portion, and a sealing ring disposed at an outer periphery of the cap portion;

the first pressing plate, the first mounting plate and the end plate are respectively provided with a first through hole, a second through hole and a pole column hole corresponding to the nail, the nail penetrates through the pole column hole, the second through hole and the first through hole and extends to the outer surface of the first pressing plate to protrude to form a pole column, and the cap is coupled to a battery cell arranged inside the body;

the second electrode terminal comprises a second pressing plate, a second mounting plate and a second connecting body, wherein one of the first mounting plate and the second mounting plate is a positive electrode weak guide plate, and the other one of the first mounting plate and the second mounting plate is a negative electrode insulating plate.

8. The cell unit of claim 6, further comprising a fluid injection hole structure disposed on any one of the middle frame, the first side plate, and the second side plate.

9. The battery cell unit of claim 7, further comprising a stopping structure and an adaptor piece located inside the stopping structure, wherein the stopping structure is disposed inside the end plate and provided with a fixing hole, the stopping structure is used for limiting the battery cell, the adaptor piece is connected to the battery cell, and the cap portion penetrates through the fixing hole and is connected to the adaptor piece.

10. A battery cell assembly, comprising a plurality of battery cell units as defined in any one of claims 1 to 9, and a smoke exhaust channel communicating with the side plate provided with the explosion-proof valve.

11. The battery cell assembly of claim 10, wherein the battery cell assembly comprises a plurality of battery cell unit groups arranged in an array, and a box frame integrating the battery cell unit groups;

each battery cell unit group comprises two battery cell units which are arranged in parallel and have gaps, and the two opposite side plates of the two battery cell units are not provided with the explosion-proof valve;

the smoke exhaust channel is arranged on the box body frame.