CN210984847U

CN210984847U - Power battery and car

Info

Publication number: CN210984847U
Application number: CN201922124574.0U
Authority: CN
Inventors: 许盼; 林法稳; 武冬冬
Original assignee: Dongguan Tafel New Energy Technology Co Ltd; Jiangsu Tafel New Energy Technology Co Ltd; Jiangsu Tafel Power System Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-07-10
Anticipated expiration: 2029-12-02

Abstract

The utility model discloses a power battery and car belongs to battery manufacturing technical field. This power battery includes electric core group, first connection piece, the second connection piece, the positive post, negative pole post and top cap, electric core group is including relative first electric core and the second electric core that sets up, the both ends of first connection piece, the both ends of second connection piece are equallyd divide do not with first electric core and second electric core ultrasonic bonding, the positive post that sets up at first connection piece middle part and the negative pole post that sets up at second connection piece middle part pass first wear to establish the hole setting on the top cap respectively and the second wears to establish the hole setting, conducting block injection moulding connects between the outer wall of the end of wearing to establish of the outstanding top cap of positive post and the outer wall of top cap, the insulating block injection moulding is connected between the outer wall of the end of wearing to establish of the outstanding top cap of negative pole post and the outer wall of top cap. This power battery can not produce the welding slag in whole equipment process, has avoided the welding slag to get into the appearance of the inside short circuit problem that causes of electric core, has improved power battery's security and packaging efficiency.

Description

Power battery and car

Technical Field

The utility model relates to a battery manufacturing technical field especially relates to a power battery and car.

Background

At present, power batteries are widely applied to various industries, such as the industry of new energy automobiles, due to the advantages of high capacity, high safety, easy matching and the like. The power battery has a procedure in the assembling process, namely welding the pole piece of the battery cell and the connecting sheet by laser welding, and welding the connecting sheet and the pole column arranged on the top cover of the power battery by laser welding. In this process, because laser welding can produce metal welding slag, when the pole piece and the electric core of laser welding connection piece and utmost point post, metal welding slag is inside very easy sputter entering electric core to cause the appearance of electric core short circuit phenomenon.

In a new energy automobile, the power battery is the only power source, so the usability of the new energy automobile is directly influenced by the performance of the power battery. When the power battery is short-circuited inside, great potential safety hazards can be caused to the new energy automobile, and the life safety of passengers is seriously threatened. Therefore, how to provide a power battery with high safety performance and difficult short circuit fault is a technical problem which needs to be solved urgently in the new energy automobile industry.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a power battery, difficult short-circuit fault that takes place, the security performance is high.

To achieve the purpose, the utility model adopts the following technical proposal:

a power cell, comprising:

at least one battery pack, wherein each battery pack comprises a first battery cell and a second battery cell which are oppositely arranged;

one end of the first connecting sheet is ultrasonically welded with the positive plate of the first electric core, the other end of the first connecting sheet is ultrasonically welded with the negative plate of the second electric core, one end of the second connecting sheet is ultrasonically welded with the negative plate of the first electric core, and the other end of the second connecting sheet is ultrasonically welded with the positive plate of the second electric core;

the positive pole is arranged in the middle of the first connecting piece, and the negative pole is arranged in the middle of the second connecting piece;

the top cover is provided with a first through hole and a second through hole, the positive pole column penetrates through the first through hole, and the negative pole column penetrates through the second through hole;

the conductive block is connected between the outer wall surface of the penetrating end of the positive pole protruding out of the top cover and the outer wall surface of the top cover in an injection molding mode;

and the insulating block is connected between the outer wall surface of the penetrating end of the negative pole column protruding out of the top cover and the outer wall surface of the top cover in an injection molding mode.

Preferably, the positive post protrudes out of the penetrating end of the top cover, a first limiting block is arranged on the penetrating end of the top cover, and the conductive block is connected with the outer wall surface of the first limiting block in an injection molding mode.

Preferably, a second limiting block is arranged at the penetrating end, protruding out of the top cover, of the negative pole column, and the insulating block is connected with the outer wall surface of the second limiting block in an injection molding mode.

Preferably, the first connecting piece and the second connecting piece are identical in structure.

Preferably, the first connecting piece and the second connecting piece each include a first portion, a second portion and a third portion that are connected in a U-shape, the first portion is connected to the first battery cell, the third portion is connected to the second battery cell, and the positive pole or the negative pole is protrudingly disposed on the second portion.

Preferably, a sealing mechanism is arranged between the first connecting sheet and the top cover; and/or

And a sealing mechanism is arranged between the second connecting sheet and the top cover.

Preferably, the sealing mechanism is a sealing ring sleeved on the positive pole or the negative pole.

Preferably, the conductive block is injection molded from conductive PPS.

Preferably, the insulation block is injection molded by insulation PPS.

Another object of the utility model is to provide a car, the energy supply of this car is stable, and the security is high.

an automobile comprises the power battery.

The utility model has the advantages that:

the utility model provides a power battery, this power battery includes the electric core group, first connection piece, the second connection piece, the anodal post, the negative pole post, the top cap, conducting block and collets, the electric core group is including relative first electric core and the second electric core that sets up, the both ends of first connection piece, the both ends of second connection piece are equallyd divide do not wear to establish the hole setting with first electric core and second electric core ultrasonic bonding, the anodal post of setting at first connection piece middle part and the setting are worn to establish the hole setting at the negative pole post at second connection piece middle part on passing the top cap respectively first and the second, the conducting block injection moulding is connected between the outer wall of wearing to establish the end of anodal post outstanding top cap and the outer wall of top cap, collets injection moulding is connected between the outer wall of wearing to establish the end of negative pole post outstanding top cap and the outer wall of top cap. This power battery is through the pole piece ultrasonic bonding with connection piece and electric core to realize the connection of connection piece and electric core, and through moulding conductive block and the insulating block of moulding one-tenth on positive and negative pole post respectively, thereby realize the fixed connection of positive and negative pole post and top cap. This power battery all processes all can not produce the welding slag in whole equipment process, have avoided the welding slag to get into the appearance of the inside short circuit problem that causes of electric core, have improved power battery's security and packaging efficiency.

Drawings

Fig. 1 is a top view of the internal structure of a power battery provided by the present invention;

fig. 2 is a front view of the internal structure of the power battery provided by the present invention;

fig. 3 is a schematic structural diagram of the electric core assembly, the first connecting piece and the second connecting piece provided by the present invention;

fig. 4 is a top view of the top cover provided by the present invention.

In the figure:

1. a first cell; 2. a second cell; 3. a first connecting piece; 4. a second connecting sheet; 5. a positive post; 6. a negative pole post; 7. a top cover; 701. a first through hole; 702. a second through hole; 81. a first stopper; 82. a second limiting block; 9. a seal ring; 10. a conductive block; 11. an insulating block.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a power battery, which is a lithium ion battery, and can be used in an automobile as a power source of the automobile. Of course, the device can be used in other devices besides automobiles. As shown in fig. 1 to 4, the power battery includes a casing (not shown in the figures) and a top cover 7, the casing is in a rectangular box-shaped structure, the top cover 7 covers an opening of the casing, and an accommodating space is formed between the casing and the top cover 7. Optionally, in this embodiment, the housing is made of an aluminum material. The power battery also comprises an electric core group, a connecting sheet, a pole and the like which are arranged in the accommodating space. The number of the electric core groups can be set to be one or more according to requirements, and in the embodiment, one electric core group is taken as an example for description.

Specifically, as shown in fig. 1 to 3, the battery core group includes a first battery cell 1 and a second battery cell 2 which are oppositely arranged, and a positive plate and a negative plate are arranged on each of the first battery cell 1 and the second battery cell 2. The connection piece includes first connection piece 3 and second connection piece 4, and the one end of first connection piece 3 and the positive plate ultrasonic bonding of first electric core 1, the other end and the negative pole piece ultrasonic bonding of second electric core 2, the one end of second connection piece 4 and the negative pole piece ultrasonic bonding of first electric core 1, the other end and the positive plate ultrasonic bonding of second electric core 2. Compared with laser welding, ultrasonic welding can not generate welding slag, so that the phenomenon that the welding slag enters the inside of the battery core and is short-circuited can be avoided, and the safety of the whole power battery assembling process is improved.

The positive pole 5 is arranged in the middle of the first connecting piece 3, and the positive pole 5 and the first connecting piece 3 can be integrally formed or can be formed by welding after being manufactured in a split mode. The middle part of the second connecting piece 4 is provided with a negative pole post 6, and the negative pole post 6 and the second connecting piece 4 can be integrally formed or can be formed by welding after being manufactured in a split mode.

The top cover 7 is provided with a first through hole 701 and a second through hole 702, the positive pole 5 is arranged through the first through hole 701, and the negative pole 6 is arranged through the second through hole 702. After the positive post 5 passes through the first through hole 701, one end of the protruding top cover 7 is a through end of the positive post 5, and after the negative post 6 passes through the second through hole 702, one end of the protruding top cover 7 is a through end of the negative post 6. And a conductive block 10 is formed by injection molding between the outer wall surface of the penetrating end of the positive pole 5 protruding out of the top cover 7 and the outer wall surface of the top cover 7 by using a conductive material, and the conductive material is gradually solidified in the injection molding process to realize the connection of the positive pole 5 and the top cover 7. Meanwhile, an insulating block 11 is formed by injection molding of an insulating material between the outer wall surface of the penetrating end of the negative pole column 6 protruding out of the top cover 7 and the outer wall surface of the top cover 7, and the insulating material is gradually solidified in the injection molding process to realize connection of the negative pole column 6 and the top cover 7.

Compared with laser welding, welding slag is not generated by the method of connecting the positive pole post 5 and the top cover 7 and connecting the negative pole post 6 and the top cover 7 by using the conductive block 10 and the insulating block 11 which are formed by injection molding, so that the phenomenon that the welding slag enters the interior of the battery core to cause short circuit can be further avoided, and the safety of the whole power battery assembly process is improved. In addition, compared with welding, the injection molding connection speed is high, and the production efficiency of the power battery is improved.

Alternatively, in the present embodiment, the conductive block 10 is injection molded from conductive PPS. The insulating block 11 is injection molded from insulating PPS. PPS, also known as polyphenylene sulfide, is a conductive PPS, which refers to polyphenylene sulfide having conductive properties, and an insulating PPS, which refers to polyphenylene sulfide having insulating properties.

Optionally, as shown in fig. 2, a first limiting block 81 is disposed at a penetrating end of the positive post 5 protruding out of the top cover 7, and the conductive block 10 is connected to an outer wall surface of the first limiting block 81 by injection molding. A second limiting block 82 is arranged at the penetrating end of the negative pole column 6 protruding out of the top cover 7, and the insulating block 11 is connected with the outer wall surface of the second limiting block 82 in an injection molding mode. Through setting up first stopper 81 and second stopper 82, can increase the area of moulding plastics of anodal post 5 and top cap 7 and negative pole post 6 and top cap 7 on the one hand, be favorable to improving joint strength, on the other hand can carry on spacingly to anodal post 5, negative pole post 6 to reduce the degree of difficulty when moulding plastics and form conducting block 10 and insulating block 11.

Optionally, in the present embodiment, the first connecting piece 3 and the second connecting piece 4 are identical in structure to reduce the manufacturing cost and the design cost. Specifically, as shown in fig. 1 and fig. 3, each of the first connection sheet 3 and the second connection sheet 4 includes a first portion, a second portion, and a third portion that are connected in a U shape, the first portion is connected to the first battery cell 1, the third portion is connected to the second battery cell 2, and the positive post 5 or the negative post 6 is protrudingly disposed on the second portion. The U-shaped connecting sheet has lower manufacturing cost and high connection stability with the electric core group.

Further, a sealing mechanism is arranged between the first connecting sheet 3 and the top cover 7, and a sealing mechanism is arranged between the second connecting sheet 4 and the top cover 7, so that the sealing performance of the power battery is improved. Alternatively, as shown in fig. 2, the sealing mechanism is a sealing ring 9 sleeved on the positive pole 5 or the negative pole 6. In this embodiment, the seal ring 9 is an elastic rubber ring.

The preparation process of the power battery comprises the following steps:

1. preparing a positive plate and a negative plate: and coating a positive active material, a positive conductive agent and a positive binder on the positive current collector to form a positive plate. In the coating, the positive electrode active material, the positive electrode conductive agent and the positive electrode binder are coated on a part of the structure of the positive electrode current collector to form a coated region of the positive electrode sheet, and the uncoated structure forms an uncoated region of the positive electrode sheet. And cutting the uncoated area of the positive electrode sheet to form the positive electrode tab. And coating a negative active material, a negative conductive agent and a negative binder on the negative current collector to form a negative plate. In the coating, a negative active material, a negative conductive agent, and a negative binder are coated on a portion of the structure of the negative current collector to form a coated region of the negative electrode sheet, and an uncoated structure forms an uncoated region of the negative electrode sheet. The uncoated region of the negative electrode sheet was cut to form a negative electrode tab.

2. And winding the prepared positive plate, the prepared negative plate and the prepared isolating membrane into a bare cell, and shaping by a pressing plate with specific temperature and pressure to form the cell to be assembled.

3. Arranging the first electric core 1 and the second electric core 2 to be assembled at intervals, and respectively welding two ends of the first connecting sheet 3 with the first electric core 1 and the second electric core 2 by ultrasonic waves; and two ends of the second connecting sheet 4 are respectively welded with the first battery cell 1 and the second battery cell 2 in an ultrasonic mode.

4. Sleeving the positive pole 5 arranged in the middle of the first connecting piece 3 into the first through hole 701 of the top cover 7, compressing the sealing ring 9, and injecting conductive PPS between the outer wall surface of the through end of the positive pole 5 and the outer wall surface of the top cover 7, wherein the conductive PPS is gradually solidified to form a conductive block 10; and simultaneously, the cathode column 6 arranged in the middle of the second connecting sheet 4 is sleeved in the second penetrating hole 702 of the top cover 7, the sealing ring 9 is compressed, the insulation PPS is injected between the outer wall surface of the penetrating end of the anode column 5 and the outer wall surface of the top cover 7, and the insulation PPS is gradually solidified to form the insulation block 11.

5. The product of step 4 was placed in a rectangular aluminum housing.

6. The top cover 7 is buckled at the opening of the shell, and the edge of the shell, which is contacted with the top cover 7, is connected in a welding mode such as laser or argon arc welding.

7. And performing the subsequent processes of vacuum drying, liquid injection, formation, degassing, capacity grading and the like, and finishing the final manufacturing of the power battery after the processes.

This embodiment still provides an automobile, and this automobile adopts foretell power battery as the power supply, and dynamic stability is high, and the security is high.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A power cell, comprising:

at least one electric core group, wherein each electric core group comprises a first electric core (1) and a second electric core (2) which are oppositely arranged;

the battery comprises a first connecting sheet (3) and a second connecting sheet (4), wherein one end of the first connecting sheet (3) is ultrasonically welded with a positive plate of the first battery cell (1), the other end of the first connecting sheet is ultrasonically welded with a negative plate of the second battery cell (2), one end of the second connecting sheet (4) is ultrasonically welded with the negative plate of the first battery cell (1), and the other end of the second connecting sheet is ultrasonically welded with the positive plate of the second battery cell (2);

the positive pole column (5) is arranged in the middle of the first connecting piece (3), and the negative pole column (6) is arranged in the middle of the second connecting piece (4);

the battery pack comprises a top cover (7), wherein a first through hole (701) and a second through hole (702) are formed in the top cover (7), the positive pole (5) penetrates through the first through hole (701) and the negative pole (6) penetrates through the second through hole (702);

the conductive block (10) is connected between the outer wall surface of the penetrating end, protruding out of the top cover (7), of the positive pole (5) and the outer wall surface of the top cover (7) in an injection molding mode;

the insulating block (11) is connected between the outer wall surface of the penetrating end of the negative pole column (6) protruding out of the top cover (7) and the outer wall surface of the top cover (7) in an injection molding mode.

2. The power cell of claim 1,

the positive pole (5) protrudes out the penetrating end of the top cover (7) is provided with a first limiting block (81), and the conductive block (10) is connected with the outer wall surface of the first limiting block (81) in an injection molding mode.

3. The power cell of claim 1,

the negative pole post (6) is protruded on the penetrating end of the top cover (7) and is provided with a second limiting block (82), and the insulating block (11) is connected with the outer wall surface of the second limiting block (82) in an injection molding mode.

4. The power cell of claim 1,

the first connecting piece (3) and the second connecting piece (4) are identical in structure.

5. The power cell of claim 4,

the first connecting piece (3) and the second connecting piece (4) are respectively provided with a first part, a second part and a third part which are connected in a U shape, the first part is connected with the first battery cell (1), the third part is connected with the second battery cell (2), and the positive pole column (5) or the negative pole column (6) is convexly arranged on the second part.

6. The power cell of claim 1,

a sealing mechanism is arranged between the first connecting sheet (3) and the top cover (7); and/or

And a sealing mechanism is arranged between the second connecting sheet (4) and the top cover (7).

7. The power cell of claim 6,

the sealing mechanism is a sealing ring (9) sleeved on the positive pole column (5) or the negative pole column (6).

8. The power cell of claim 1,

the conductive block (10) is formed by conductive PPS in an injection molding mode.

9. The power cell of claim 1,

the insulation block (11) is formed by injection molding of insulation PPS.

10. An automobile, characterized by comprising the power battery according to any one of claims 1 to 9.