CN221041209U

CN221041209U - Semi-finished single battery

Info

Publication number: CN221041209U
Application number: CN202322654187.4U
Authority: CN
Inventors: 雷政军; 陈孟奇
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2024-05-28
Anticipated expiration: 2033-09-28

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. 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, forming and the like for each single battery at one time, 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 is used for manufacturing the high-capacity battery, wherein the semi-finished single battery comprises a shell, a positive electrode post, a negative electrode post 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.

Further, at least one sealing and unpacking mechanism is arranged on the shell.

Further, the two sealing unpacking mechanisms are arranged, one sealing unpacking mechanism is arranged on the side wall of the shell in the thickness direction or at the bottom of the shell, and the other sealing unpacking mechanism is arranged at the top of the shell. The sealing and unpacking mechanism is arranged on the side wall of the shell in the thickness direction or at the bottom of the shell and is used for forming a first through hole after being opened, and the first through hole is used for enabling all the single batteries in the high-capacity battery to be in the same electrolyte system; the sealing and unpacking mechanism arranged at the top of the shell is used for forming a third through hole after being opened, and the third through hole is used for enabling each single battery in the high-capacity battery to be in a state of balancing gas.

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:

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.

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 third semi-finished unit cell;

fig. 4 is a schematic structural view of a large-capacity battery having only a first channel;

Fig. 5 is a box structure of the high-capacity battery of fig. 4;

Fig. 6 is a schematic structural view of a high-capacity battery having a first channel and a second channel;

Fig. 7 is a box structure of the high-capacity battery of fig. 6;

fig. 8 is a flow chart of the method of the present utility model.

The reference numerals are as follows:

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

200-large-capacity battery, 9-box, 10-single battery, 11-second through hole, 12-pole adapter, 13-hollow component, 14-second barrel, 15-first cover plate, 16-second cover plate, 17-first channel, 18-second channel, 19-third cover plate, 20-fourth cover plate.

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, the method has the advantages that the steps of liquid injection, sealing, formation and the like for each single battery are reduced, and the manufacturing efficiency of the large-capacity battery is greatly improved.

Semi-finished single battery

The specific structures of the semi-finished single battery 100 adopted in the method are as follows:

As shown in fig. 1, a first semi-finished single battery 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 top of the shell is provided with a explosion venting membrane.

Before the semi-finished single battery is formed into a semi-finished large-capacity battery, a first through hole communicated with the inner cavity of the semi-finished single battery is formed on the side wall or the bottom of the shell through a screwdriver or other sharp tools in a specific environment, so that the inner cavity of each semi-finished single battery can be acted when the semi-finished single battery is vacuumized in the later period, and electrolyte can enter the inner cavity of each semi-finished single battery during liquid injection.

As shown in fig. 2, the second semi-finished single battery 100 includes a case 1, a sealing and unpacking mechanism 4 provided on the bottom or side wall of the case, and an electrode assembly provided in the 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 1, and a explosion venting membrane is arranged at the top of the shell 1.

After the semi-finished single battery is formed into a semi-finished large-capacity battery, under a specific environment, an external force or electrolyte is utilized to open the sealing unpacking mechanism 4 on the side wall or the bottom of the shell, so that a first through hole is formed on the shell of each single battery, the inner cavity of each semi-finished single battery can be acted when the semi-finished single battery is vacuumized in the later period, and the electrolyte can enter the inner cavity of each semi-finished single battery when the electrolyte is injected.

As shown in fig. 3, the third semi-finished battery cell 100 has a similar structure to the second finished battery cell except that: the explosion venting membrane at the top of the casing 1 of the semi-finished single battery 100 is replaced by another sealing and unpacking mechanism 4 (that is, the casing of the semi-finished single battery is provided with two sealing and unpacking mechanisms 4) for forming a third through hole on the semi-finished single battery.

The specific environment is preferably an environment with dew point standard of-25 to 40 deg.C, humidity of 1% or less, temperature of 23 deg.C.+ -. 2 ℃ and cleanliness of 10 ten thousand.

In addition, the two semi-finished single battery shells have two structural forms, as shown in fig. 1 to 3:

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, the positive and negative poles of the upper cover plate 6 are connected with the positive and negative poles of the electrode assembly, the upper cover plate 6 and the electrode assembly are placed into the first cylinder body as a whole from the upper open end of the first cylinder body, and finally the upper cover plate 6 and the open end of the first cylinder body 5 are welded.

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.

When the case 1 has the sealing and unpacking mechanism 4, the sealing and unpacking mechanism 4 may be mounted on the side wall of the first cylinder 5, the lower cover plate 7 and the upper cover plate 6 in advance, and then the semi-finished unit battery may be assembled.

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.

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. 4 and 5, the case 9 includes a second cylinder 14, a first cover 15, and a second cover 16; the top and the bottom of the second cylinder 14 are both open, and the first cover plate 15 is fixed (welded) on the top of the second cylinder 14 in a sealing manner and fixed (welded) on the bottom of the second cylinder 14 in a sealing manner; the first cover plate 15 is provided with 2N second through holes 11.

Preferably, in order to make the electrolyte smoothly enter the box 9 and the inner cavity of each semi-finished single battery 100 in the process of injecting the electrolyte, a first channel 17 extending along the arrangement direction of the single batteries and corresponding to the first through hole on each single battery 10 shell is formed on the side wall of the second cylinder 14 or the second cover plate 16 according to the position of the first through hole on each single battery shell, and when the first channel 17 is provided, an injection port is formed 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 a vacuumizing device and an injection device.

Preferably, the first cover 15 may further be provided with two sides of a second channel 18,2N with second through holes 11 being arranged on the second channel 18, and when the top of the semi-finished single battery is the explosion venting membrane (i.e. when the second semi-finished single battery is adopted), the second channel 18 covers over the explosion venting membrane of each single battery, and the second channel is used as the explosion venting channel; when a third through hole is formed in the top of the semi-finished single battery (i.e., when the third semi-finished single battery is adopted), the second channel 18 is used for communicating with the inner cavity of each single battery and is used as a gas balance cavity of each single battery; meanwhile, an exhaust valve can be arranged in the second channel 18, the probability of swelling 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 to exhaust the gas generated in the aging process.

2. Referring to fig. 6 and 7, the case 9 includes a second cylinder 14, a third cover 19, and a fourth cover 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.

Preferably, in order to make the electrolyte smoothly enter the box 9 and the inner cavity of each semi-finished single battery 100 in the process of injecting the electrolyte, a first channel extending along the arrangement direction of the single batteries and corresponding to the first through hole on each single battery shell is formed on the side wall or the bottom of the second cylinder 14 according to the position of the first through hole on each single battery shell, and when the first channel 17 is provided, an injecting port is formed on the third cover plate 19 or the fourth terminal plate 20, and the injecting port can be used as an interface of the vacuumizing device and the injecting device at the same time.

Preferably, the top of the second cylinder may further be provided with two sides of a second channel 18,2N with second through holes 11 being arranged on two sides of the second channel 18, and when the top of the semi-finished single battery is the explosion venting membrane (i.e. when the second semi-finished single battery is adopted), the second channel 18 covers over the explosion venting membrane of each single battery, the second channel 18 is used as the explosion venting channel; when a third through hole is formed in the top of the semi-finished single battery (i.e., when the third semi-finished single battery is adopted), the second channel 18 is used for communicating with the inner cavity of each single battery and is used as a gas balance cavity of each single battery; meanwhile, an exhaust valve can be arranged in the second channel 18, the probability of swelling 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 to exhaust the gas generated in the aging process.

The specific implementation process of the method for manufacturing a 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 the square lithium ion structure of the commercial aluminum, and is different in that electrolyte is not injected into the semi-finished single battery;

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

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

In the step, the mode of forming the first through hole on the shell of the semi-finished single battery before putting the plurality of semi-finished single batteries into the box body is as follows: directly destroying the shell of the semi-finished single battery to form a first through hole on the shell;

The mode of forming the first through hole on the shell of the semi-finished single battery after putting the semi-finished single battery into the box body is as follows: the semi-finished single battery is provided with a sealing and unpacking mechanism, and a special tool is adopted to open the sealing and unpacking mechanism on the shell of each semi-finished single battery, so that a first through hole is formed in each semi-finished single battery. The sealing and unpacking mechanism adopted by the semi-finished single battery in the mode is a pull ring sealing mechanism which is opened through a traction rope and is disclosed in Chinese patent CN 218525645U.

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.

The scheme of the method is as follows: the vacuumizing step is needed to be executed before the liquid injection and the formation;

Because the mode through opening sealed unpacking mechanism forms the in-process of first through-hole probably can produce aluminium bits on semi-manufactured goods battery, the box also probably introduces impurity at sealed in-process (generally welds the mode simultaneously), impurity production can inevitably cause the influence to the performance of large capacity battery, this evacuation process then can get rid of the impurity in box inner chamber and each semi-manufactured goods battery inner chamber to in the evacuation box and semi-manufactured goods battery inner chamber all be negative pressure state, still can ensure when follow-up notes liquid, electrolyte can get into box inner chamber and each semi-manufactured goods battery inner chamber smoothly.

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

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

the positive pole and the negative pole are fixed at the top 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.

2. The semi-finished single battery as claimed in claim 1, wherein the housing is provided with at least one sealing and unpacking mechanism.

3. The semi-finished single battery according to claim 2, wherein the number of the sealing and unpacking mechanisms is two, one sealing and unpacking mechanism is arranged on the side wall in the thickness direction of the shell or the bottom of the shell, and the other sealing and unpacking mechanism is arranged on the top of the shell.

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.