CN221041210U - Semi-finished single battery - Google Patents

Abstract

The utility model discloses a semi-finished single battery, which comprises a shell, a positive pole column, a negative pole column and an electrode assembly, wherein the shell is provided with a plurality of grooves; the positive pole post and the negative pole post are fixed on the top plate of the shell in an insulating way; a part of the positive pole and a part of the negative pole extend out of the top of the shell; the other parts of the positive pole post and the negative pole post extend into the shell and are connected with an electrode assembly arranged in the shell; electrolyte is not injected into the shell; at least one first through hole is arranged on the shell. Compared with the existing method for manufacturing the large-capacity battery by adopting finished single batteries, the method reduces the steps of sealing, filling liquid and forming each single battery once and unpacking the single battery twice, and greatly improves the manufacturing efficiency of the large-capacity battery.

Description

Semi-finished single battery

Technical Field

The utility model relates to the field of batteries, in particular to a semi-finished single battery.

Background

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

The existing high-capacity battery is composed of a plurality of single batteries and a box body, and as each single battery is located under a shared electrolyte system, the consistency of each single battery is ensured, and the cycle life of the high-capacity battery is prolonged. The manufacturing process of the high-capacity battery is approximately as follows:

Manufacturing finished product single battery

And assembling the electrode assembly in a winding or lamination mode, putting the electrode assembly into a shell, then injecting electrolyte into the shell for the first time, sealing the single battery, forming and the like, and finishing the manufacturing of the finished single battery.

Manufacturing of high capacity battery

And (3) connecting the single batteries in the same group in parallel, filling the single batteries into a box body, performing secondary liquid injection and formation, and then completing the manufacture of the high-capacity battery.

According to the method, when the conventional high-capacity battery is manufactured, the liquid injection step is firstly carried out when the single battery is manufactured, and then the step of sealing and forming the single battery is carried out; in addition, when the large-capacity battery is manufactured, the secondary opening and secondary liquid injection are carried out on each single battery.

Therefore, in the actual production process, the process for manufacturing the large-capacity battery by adopting the method is complicated, and the manufacturing cost is high.

Disclosure of utility model

In order to solve the problems of complicated manufacturing process and high manufacturing cost of the existing high-capacity battery, the utility model provides a semi-finished single battery which comprises a shell, a positive electrode column, a negative electrode column and an electrode assembly; the positive pole post and the negative pole post are fixed on the top plate of the shell in an insulating way; a part of the positive pole and a part of the negative pole extend out of the top of the shell; the other parts of the positive pole post and the negative pole post extend into the shell and are connected with an electrode assembly arranged in the shell; electrolyte is not injected into the shell; at least one first through hole is arranged on the shell.

Further, at least one first through hole is formed in the top of the housing.

Further, at least one first through hole is formed in the bottom or the side wall of the shell, and a third through hole is formed in the top of the shell.

Further, grooves are formed in the positive electrode post and the negative electrode post.

Further, the positive pole and the negative pole are fixedly connected with pole switching pieces, and grooves are formed in the pole switching pieces.

Compared with the prior art, the utility model has the beneficial effects that:

1. The utility model adopts the semi-finished single battery without liquid injection to form the semi-finished large-capacity battery, and then carries out operations such as liquid injection, formation and the like on the semi-finished large-capacity battery to manufacture the large-capacity battery.

2. According to the utility model, the first through hole is directly formed in the shell of the semi-finished single battery, compared with the existing finished single battery, the sealing unpacking mechanism for secondary unpacking is reduced, and the third through hole is directly formed in the top of the shell, compared with the existing finished single battery, the use of the explosion venting film is reduced, so that the manufacturing cost is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a first semi-finished unit cell;

fig. 2 is a schematic structural view of a second semi-finished unit cell;

fig. 3 is a schematic structural view of a high-capacity battery having only a first channel;

Fig. 4 is a box structure of the high-capacity battery of fig. 3;

fig. 5 is a schematic structural view of a high-capacity battery having a first channel and a second channel;

Fig. 6 is a box structure of the high-capacity battery of fig. 5;

fig. 7 is a flowchart of a method for manufacturing a large-capacity battery.

The reference numerals are as follows:

100-semi-finished single battery, 1-shell, 2-positive pole, 3-negative pole, 4-first through hole, 5-first cylinder, 6-upper cover plate, 7-lower cover plate, 8-groove and 21-third through hole;

200-large-capacity battery, 9-box, 11-second through hole, 12-post adapter, 13-hollow component, 14-second barrel, 15-first apron, 16-second apron, 17-first passageway, 18-second passageway, 19-third apron, 20-fourth apron.

Detailed Description

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

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

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

The basic design idea of the utility model is as follows:

The method comprises the steps of manufacturing a plurality of semi-finished single batteries without electrolyte, placing the semi-finished single batteries into a box body after being connected in parallel, sealing the box body, injecting the electrolyte into the box body, enabling the electrolyte in the inner cavity of each semi-finished single battery and the electrolyte in the box body to be under an electrolyte system, and performing formation operation to finish manufacturing of the large-capacity battery. Compared with the existing method for manufacturing the large-capacity battery by adopting finished single batteries, the method reduces the steps of sealing, filling liquid and forming the single batteries and the step of secondary unpacking the single batteries, and greatly improves the manufacturing efficiency of the large-capacity battery.

Semi-finished single battery

As shown in fig. 1, a semi-finished unit cell 100 includes a case 1 and an electrode assembly disposed in an inner cavity of the case; the electrode assembly is formed by sequentially arranging an anode, a diaphragm and a cathode and adopting lamination or winding technology; the positive electrode of the electrode assembly is connected with the positive electrode post 2 at the top of the shell, and the negative electrode of the electrode assembly is connected with the negative electrode post 3 at the top of the shell; electrolyte is not injected into the inner cavity of the shell; at least one first through hole 4 (the number of the first through holes may be more than two, or one first through hole with larger aperture is provided) is provided on the housing.

In some embodiments, the first through hole 4 may be provided on the bottom or side wall of the case for filling and vacuuming when assembling the high-capacity battery.

In some embodiments, the first through hole 4 may be provided at the top of the housing for liquid injection, vacuum pumping, venting, and explosion venting when assembling the high capacity battery.

As shown in fig. 2, the second semi-finished unit cell 100 includes a case 1 and an electrode assembly disposed in an inner cavity of the case; the electrode assembly is formed by sequentially arranging an anode, a diaphragm and a cathode and adopting lamination or winding technology; the positive electrode of the electrode assembly is connected with the positive electrode post 2 at the top of the shell, and the negative electrode of the electrode assembly is connected with the negative electrode post 3 at the top of the shell; electrolyte is not injected into the inner cavity of the shell; the side or bottom of the housing is provided with at least one first through hole 4 (the number of the first through holes may be more than two, or one first through hole with larger aperture is provided), and the top of the housing is provided with a third through hole 21.

The first through hole 4 is used for injecting liquid and vacuumizing when the high-capacity battery is assembled; the third through hole 21 is used for venting air and explosion venting when assembling a large-capacity battery.

Because at least one first through hole exists in the two semi-finished single batteries, before the semi-finished single batteries are assembled into a large-capacity battery, or during storage and transportation, the electrode assemblies of the semi-finished single batteries are required to be ensured not to be corroded by the external environment, and therefore the first through holes (and third through holes) of the semi-finished single batteries can be sealed in a film heat sealing mode;

if the film heat sealing mode is not adopted, the storage area of the semi-finished single battery is required to be set to be a specific environment, and the semi-finished single battery is placed in a transportation warehouse with the specific environment for transportation during transportation.

In order to further improve the manufacturing efficiency of the large-capacity battery, it is preferable that the assembly of the semi-finished unit cell and the semi-finished large-capacity battery is sequentially completed in one clean workshop (workshop having the above-described specific environment).

In addition, the two semi-finished single battery shells have two structural forms, as shown in fig. 1 to 2:

The first housing 1 comprises a first cylinder 5 and an upper cover plate 6; the first cylinder 5 has a structure with an open upper end and a closed lower end; when the semi-finished single battery is assembled, firstly, connecting the positive and negative poles of the upper cover plate 6 with the positive and negative poles of the electrode assembly, then placing the upper cover plate 6 and the electrode assembly into the first cylinder body as a whole from the upper open end of the first cylinder body, and finally welding the upper cover plate 6 and the open end of the first cylinder body 5;

The second shell comprises a first cylinder 5, an upper cover plate 6 and a lower cover plate 7; the upper end and the lower end of the first cylinder body 5 are both open structures; when the semi-finished single battery is assembled, the lower cover plate 7 is welded with the lower open end of the first barrel, then the positive and negative poles of the upper cover plate 6 are connected with the positive and negative poles of the electrode assembly, then the upper cover plate 6 and the electrode assembly are placed into the first barrel from the upper open end of the first barrel 5 as a whole, and finally the upper cover plate 6 and the upper open end of the first barrel 5 are welded.

It is emphasized that: the shell of the semi-finished single battery is made of aluminum materials, namely the first cylinder 5, the upper cover plate 6 and the lower cover plate 7 are all made of aluminum materials.

And, at least one first through hole 4 and one third through hole 21 are all opened in advance on first barrel 5, upper cover plate 6, lower cover plate 7 before the equipment semi-manufactured goods battery cell.

In some other embodiments, the positive and negative electrode posts of the semi-finished unit cell 100 may be provided with grooves 8 for clamping the heat transfer tube. The heat transfer tube may be a liquid cooled tube or a heat pipe for charging the positive and negative electrode posts, and thus it is necessary to ensure that the heat transfer tube itself and the medium within the heat transfer tube remain insulated from external devices.

High capacity battery

Based on the above description of the structure of the half-finished unit cell 100, the structure of the large-capacity battery 200 assembled by the above method and the half-finished unit cell will now be described:

As shown in fig. 4, the large-capacity battery 200 includes a case 9 and N unit batteries 10; the N single batteries 10 are arranged in the box body 9 in parallel; the shell 1 of each single battery is provided with a first through hole; the tank body 9 is provided with a liquid injection port (not shown in the figure); the top of the box body 9 is provided with second through holes 11 for leading out positive poles and negative poles of the single batteries 10, and the top area of the box body 9 corresponding to each second through hole 11 is fixedly sealed with the top of the single battery 10 shell corresponding to the second through hole 11; the electrolyte in each cell 10 is in communication with the electrolyte in the tank 9, which in turn places each cell in a shared electrolyte system.

Because the positive pole and the negative pole of the single battery 10 are led out of the top of the box body in the embodiment, one heat transfer tube can be arranged on the grooves 8 of the positive poles of all the single batteries 10, one heat transfer tube is arranged on the grooves 8 of the negative poles of all the single batteries, and the external temperature control device is connected with the two heat transfer tubes, so that the temperature control of the high-capacity battery can be realized (namely, the high-capacity battery can be heated or cooled).

It should be noted that: the positive electrode column and the negative electrode column provided with the grooves 8 can be the electrode column of the semi-finished single battery, or can be a pole column adapter 12 fixedly connected to the electrode column, and the grooves are formed in the pole column adapter 12.

In the embodiment, the case 9 is made of aluminum material;

The mode that the top area of the box body corresponding to each second through hole is fixedly sealed with the top of the single battery shell corresponding to the second through hole is as follows:

1. And a sealing connecting piece is additionally arranged between the top area of the box body 9 corresponding to the second through hole 11 and the upper cover plate of the single battery 10 corresponding to the second through hole, so that sealing is realized. Referring to fig. 2 and 4, the sealing connector comprises a hollow member 13, wherein the bottom of the hollow member 13 is used for sealing connection with a first area of the single battery 10, and the top of the hollow member 13 is connected with a second area of the box 9; the first area is an area located at the periphery of any pole of the upper cover plate of any single battery 10; the second area is an area corresponding to any one of the second through holes 11 positioned at the top of the box body 9. The area corresponding to the second through holes 11 is the peripheral area corresponding to any one of the second through holes 11 on the outer surface of the box body 9; or the region corresponding to the second through hole 11 is a through hole wall. The area around the pole is the area around the insulating sealing pad on the pole. The insulating sealing gasket is a part used for insulating between the pole and the upper cover plate of the single battery.

2. The fixing and sealing can be directly realized by the laser fusion welding mode between the box body 9 area corresponding to the periphery of the second through hole 11 and the upper cover plate area of the periphery of the battery cell pole. The mode is generally suitable for being adopted under the condition that the sizes of all the single batteries in the box body in the height direction are relatively consistent.

Wherein, the box structure has following several:

1. Referring to fig. 3 and 4, the case 9 includes a second cylinder 14, a second cover 16; the top and the bottom of the second cylinder 14 are both open, the first cover plate 15 is fixed (welded) on the top of the second cylinder 14, and the second cover plate 16 is fixed (welded) on the bottom of the second cylinder 14; the first cover plate 15 is provided with 2N second through holes 11.

In some embodiments, when only the first through hole is provided on the cell casing, in order to enable the electrolyte to smoothly enter the box 9 and the inner cavity of each semi-finished cell 100 in the injection process, according to the position of the first through hole on each cell casing, a first channel 17 extending along the arrangement direction of the cells and corresponding to the first through hole on each cell 10 casing is provided on the side wall of the second cylinder 14 in the length direction, or on the first cover plate 15, or on the second cover plate 16, and when the first channel 17 is provided, the injection port is provided in the area of the box 9 corresponding to any end of the first channel 17, and the injection port can be used as an interface of the vacuum pumping device and the injection device.

In particular the number of the elements,

When the first through hole 4 is disposed on the lower cover plate or the side wall of the single battery, the first channel 17 for communicating with the first through hole of each single battery is correspondingly disposed on the side wall of the second cover plate 16 or the second cylinder 14, and the first channel 17 has the following two functions:

(1) When the vacuum is pumped, impurities are conveniently pumped out;

(2) When the electrolyte is injected, the electrolyte can more smoothly enter the inner cavities and the box bodies of the single batteries, so that the continuity of the electrolyte in the shared electrolyte system is stronger (the phenomenon of liquid breaking is avoided).

When the first through holes 4 are formed in the upper cover plate of the unit cell 10, the first cover plate 15 is correspondingly provided with first channels 17 for communicating with the first through holes 4 of each unit cell, and the first channels 17 have the following four functions:

(1) When the vacuum is pumped, impurities are conveniently pumped out;

(2) And the electrolyte can smoothly enter the inner cavities and the box bodies of the single batteries during liquid injection, so that the continuity of the electrolyte in the shared electrolyte system is stronger (the phenomenon of liquid breaking is avoided).

(3) After the high-capacity battery is assembled, the electrolyte in each single battery and the box body is located at the bottom of the inner cavity of the single battery and the bottom of the box body under the action of gravity, so that the first channel can be used as a gas channel in the aging or running process, each single battery is located in a gas balance system, the uniformity of each single battery is improved from the air pressure angle, the circulating performance of the high-capacity battery is further improved, the internal pressure of each single battery is basically the same, the risk of thermal runaway of a certain single battery due to overlarge internal pressure is greatly reduced, the safety of the high-capacity battery is improved, if an exhaust valve is additionally arranged on the first channel, the probability of bulge of the single battery can be further avoided by periodically opening the exhaust valve, and the exhaust valve can be opened after the high-capacity battery is aged, so that the gas generated in the aging process is discharged. The cycle life of the high-capacity battery can be further improved.

(4) And the explosion venting valve can be arranged on the first channel, so that when a certain single battery is out of control, the out-of-control smoke is discharged to the external out-of-control smoke treatment device through the first through hole and the first channel for timely treatment, and the probability of more serious accidents is reduced.

Referring to fig. 5 and 6, in some embodiments, when the first through hole of the unit cell is disposed on the side wall or the bottom of the unit cell, in order to simultaneously satisfy the above four functions (1) (2) (3) (4), a third through hole 21 may be further disposed on the top of the unit cell, then: the first cover 15 may further be provided with two sides of the second channel 18,2N with the second through holes 11 being separated into the second channels 18. The first channel in this embodiment has (1) (2) two functions; the second channel has two functions (3) (4).

2. As shown in fig. 6 and 7, the case 9 includes a second cylinder 14, a third cover plate 19, and a fourth cover plate 20; the front and the rear of the second cylinder 14 are both open, a third cover plate 19 is fixed (welded) on the front of the second cylinder 14 in a sealing way, and a fourth cover plate 20 is fixed (welded) on the rear of the second cylinder 14 in a sealing way; 2N second through holes 11 are formed in the top of the second cylinder 14.

In some embodiments, when there is only one first through hole on the casing of the unit cell, in order to make the electrolyte smoothly enter the box 9 and the inner cavity of each semi-finished unit cell 100 in the injection process, according to the first through hole position on each unit cell casing, a first channel 17 extending along the arrangement direction of the unit cells and corresponding to the first through hole on each unit cell 10 casing is formed on the top, bottom or side wall of the second cylinder 14, and when there is the first channel 17, the injection port is disposed on the end plate corresponding to either end of the first channel 17, and the injection port can be used as the interface of the vacuum pumping device and the injection device at the same time.

In particular the number of the elements,

Referring to fig. 3 and 4, when the first channel 17 is disposed on the lower cover plate or the sidewall of the battery cell when the first through hole 4 is disposed on the lower cover plate or the sidewall of the battery cell, correspondingly, the bottom or the sidewall of the second cylinder 14 is provided with the first channel 17 for communicating with the first through hole 4 of each battery cell, and the first channel has the following two functions:

(1) When the vacuum is pumped, impurities are conveniently pumped out;

(2) And the electrolyte can smoothly enter the inner cavities and the box bodies of the single batteries during liquid injection, so that the continuity of the electrolyte in the shared electrolyte system is stronger (the phenomenon of liquid breaking is avoided).

When the first through hole sets up in battery cell upper cover plate, correspondingly, second barrel top is provided with and is used for the first passageway with the first through hole intercommunication of each battery cell, and this first passageway then possesses four functions:

(1) When the vacuum is pumped, impurities are conveniently pumped out;

(2) And the electrolyte can smoothly enter the inner cavities and the box bodies of the single batteries during liquid injection, so that the continuity of the electrolyte in the shared electrolyte system is stronger (the phenomenon of liquid breaking is avoided).

(3) After the high-capacity battery is assembled, the electrolyte in each single battery and the box body is located at the bottom of the inner cavity of the single battery and the bottom of the box body under the action of gravity, so that the first channel can be used as a gas channel in the aging or running process, each single battery is located in a gas balance system, the uniformity of each single battery is improved from the air pressure angle, the circulating performance of the high-capacity battery is further improved, the internal pressure of each single battery is basically the same, the risk of thermal runaway of a certain single battery due to overlarge internal pressure is greatly reduced, the safety of the high-capacity battery is improved, if an exhaust valve is additionally arranged on the first channel, the probability of bulge of the single battery can be further avoided by periodically opening the exhaust valve, and the exhaust valve can be opened after the high-capacity battery is aged, so that the gas generated in the aging process is discharged. The cycle life of the high-capacity battery can be further improved.

(4) And the explosion venting valve can be arranged on the first channel, so that when a certain single battery is out of control, the out-of-control smoke is discharged to the external out-of-control smoke treatment device through the first through hole and the first channel for timely treatment, and the probability of more serious accidents is reduced.

As shown in fig. 5 and 6, in some embodiments, when the first through hole of the unit cell is disposed on the side wall or the bottom of the unit cell, in order to simultaneously satisfy the above four functions (1) (2) (3) (4), a third through hole 21 may be further disposed on the top of the unit cell, then: the top of the second cylinder 14 may further be provided with second channels 18,2N and second through holes 11 that are arranged on two sides of the second channel 18. The first channel in this embodiment has (1) (2) two functions; the second channel has two functions (3) (4).

The specific implementation process of the manufacturing method of the large-capacity battery provided in this embodiment is as follows, as shown in fig. 7:

step 1: assembling a semi-finished single battery without electrolyte injection;

The semi-finished single battery is basically consistent with a commercially available aluminum square lithium ion structure, and is different in that electrolyte is not injected into the semi-finished single battery, and the semi-finished single battery is provided with a first through hole;

step 2: assembling a semi-finished product high-capacity battery;

Placing a plurality of semi-finished single batteries into a box body, communicating the inner cavity of each semi-finished single battery with the inner cavity of the box body through a first through hole, sealing the box body, connecting the poles of each semi-finished single battery extending out of the box body in parallel, and forming a semi-finished large-capacity battery;

In this step, the process of sealing the tank is to ensure that the interior of the tank remains isolated from the external environment. Thus, there are at least two areas of actual sealing:

1. When the semi-finished single batteries are put into the box body, the box body is inevitably provided with an open end, so that after all the semi-finished single batteries are put into the box body, the open end needs to be sealed;

2. Since the terminal of each semi-finished single battery in the semi-finished large-capacity battery needs to extend out of the top of the box body, the area of the top of the box body, which is used for extending out of the terminal, needs to be sealed.

Step 3: injecting liquid and forming;

electrolyte is injected into the box body, so that each single battery is under a unified electrolyte system, and then the battery is formed into a large-capacity battery.

In the process, the specific mode of formation is as follows:

Charging to 3.4V with constant current of 0.1C, charging to current of 0.01C at constant voltage of 3.4V, and standing for 30min;

Discharging to 2.5V at constant current of 0.1C, and standing for 30min;

Then charging to 3.4V with 0.2C constant current, charging to 0.01C current with 3.4V constant voltage, and standing for 30min. The formation process can enable each single battery in the large-capacity battery to have a more stable SEI film, so that the large-capacity battery has a more stable circulation capacity.

Steps 1 to 3 above need to be performed in a specific environment, preferably an environment with dew point standards of-25 to 40 ℃, humidity of 1% or less, temperature 23 ℃ ± 2 ℃, and cleanliness of 10 ten thousand levels.

The scheme of the method is as follows: the vacuum pumping step is also needed to be carried out on the semi-finished product high-capacity battery before the liquid injection and the formation;

Because the box body is possibly introduced with impurities in the sealing process (generally in a welding mode), the impurities can influence the performance of the high-capacity battery, the impurities in the inner cavity of the box body and the inner cavities of all semi-finished single batteries can be removed in the vacuumizing process, the inner cavities of the box body and the semi-finished single batteries are in a negative pressure state after vacuumizing, and electrolyte can smoothly enter the inner cavities of the box body and the inner cavities of all the semi-finished single batteries in the subsequent liquid injection process;

What needs to be explained here is: the interface used in the vacuum pumping and the liquid injection in the step 3 can be one interface or two interfaces which are separated on the box body.

In some embodiments, the high-capacity battery can be aged at 50 ℃ for 48 hours after formation, and the high-capacity battery can be selectively exhausted after aging, so that the exhaust gas after formation is exhausted, and the probability of swelling of each single battery of the high-capacity battery is reduced.

Claims (5)

1. A semi-finished single battery is used for manufacturing a high-capacity battery with a shared electrolyte system and is characterized by comprising a shell, a positive electrode column, a negative electrode column and an electrode assembly;

The positive pole post and the negative pole post are fixed on the top plate of the shell in an insulating way; a part of the positive pole and a part of the negative pole extend out of the top of the shell; the other parts of the positive pole post and the negative pole post extend into the shell and are connected with an electrode assembly arranged in the shell; electrolyte is not injected into the shell; at least one first through hole is arranged on the shell.

2. A semi-finished cell as claimed in claim 1, wherein the top of the housing is provided with at least one first through hole.

3. A semi-finished cell as claimed in claim 2, wherein at least one first through hole is provided in the bottom or side wall of the housing and a third through hole is provided in the top of the housing.

4. A semi-finished single cell according to any one of claims 1 to 3, wherein the positive and negative electrode posts are each provided with grooves.

5. A semi-finished single cell according to any one of claims 1 to 3, wherein the positive electrode post and the negative electrode post are fixedly connected with a post adapter, and the post adapter is provided with a groove.