CN219246809U - Single battery, power battery pack and vehicle - Google Patents

Abstract

The application relates to a battery cell, power battery package and vehicle, this battery cell includes: at least two bare cells; the shell is sleeved outside the bare cell; the middle connecting piece is arranged between two adjacent bare cells; wherein, this middle part connecting piece includes: the sealing plastic comprises a conductive column, a metal partition plate, an insulating piece and sealing plastic; two sides of the conductive column are respectively and electrically connected with the lugs of the corresponding two bare cells so as to connect each bare cell in series and splice the bare cells; the metal separator is fixedly connected with the shell, and the metal separator and the shell are configured to form a plurality of cavities for accommodating bare cells; the insulating pieces are arranged on two sides of the metal partition board and between the metal partition board and the corresponding bare cell; the sealing plastic is arranged between the conductive column and the metal partition board so as to insulate and seal the conductive column and the metal partition board. By using the single battery, the safety of the battery can be improved.

Description

Single battery, power battery pack and vehicle

Technical Field

The application relates to the technical field of batteries, in particular to a single battery, a power battery pack and a vehicle.

Background

The statements herein merely provide background information related to the present application and may not necessarily constitute prior art.

With the development of electric vehicles, a high-voltage power battery system has become a development trend. In order to increase the overall voltage of the battery pack, a power battery pack for an electric vehicle is generally powered by a series connection or a series-parallel hybrid manner of a plurality of large-capacity single batteries. In the case of a generally fixed battery pack, each unit cell has an independent structure such as a housing and a pole, so that the serial-parallel connection of a plurality of unit cells may reduce the overall energy density of the battery pack. For this reason, an internal string battery design in which two or more bare cells are internally connected in series (referred to as an internal string) to form a single battery as a whole may be adopted, so as to simplify or reduce the structures of the casing, the pole, and the like. The internal string battery design has the advantages of high volume utilization rate, simple whole-package management, low battery package cost and the like, and therefore has good application prospect.

However, in the case of a high-voltage and large-capacity internal battery, the electrolyte is more easily oxidized and decomposed by the high voltage, which may cause accidents such as heat generation and combustion. In addition, once a short circuit occurs somewhere inside the battery, the battery core releases a large amount of heat in a short time, so that the complete failure of the single battery is likely to be caused, and even safety accidents such as combustion explosion and the like of the electrolyte can be ignited. Therefore, there is a need to improve the safety of the battery.

Disclosure of Invention

The utility model provides a novel battery cell, power battery package and vehicle, the technical problem who solves is the security that improves the battery.

The purpose of the application is achieved by adopting the following technical scheme. According to one aspect of the present application, there is provided a unit cell including: at least two bare cells; the shell is sleeved outside the bare cell; and the middle connecting piece is arranged between two adjacent bare cells. Wherein, the middle part connecting piece includes: conductive posts, metal separators, insulators and sealing plastics. The two sides of the conductive column are respectively and electrically connected with the lugs of the corresponding two bare cells so as to connect the bare cells in series and splice the bare cells; the metal separator is fixedly connected with the shell, and the metal separator and the shell are configured to form a plurality of cavities for accommodating bare cells; the insulating pieces are arranged on two sides of the metal partition board and between the metal partition board and the corresponding bare cell; the sealing plastic is arranged between the conductive column and the metal partition plate, so that the conductive column and the metal partition plate are insulated and sealed.

In some embodiments, the metal separator has a through hole, the sealing plastic is a ring structure, the ring structure is accommodated in the inside of the through hole of the metal separator, and the conductive column is accommodated in the inside of the ring structure. The insulating piece is also provided with a corresponding through hole, and the conductive column and the tab are connected electrically through the through hole of the insulating piece.

In some embodiments, the sealing plastic is formed between the conductive post and the metal separator by an injection molding process, and the conductive post is fixed to the metal separator such that the conductive post, the sealing plastic, and the metal separator are formed as one body.

In some embodiments, the positive electrode tab and the negative electrode tab of each bare cell are disposed at two ends of the bare cell along the length direction; the at least two bare cells are distributed along the length direction; one side of the conductive column is electrically connected with the negative electrode lug of one bare cell, and the other side of the conductive column is electrically connected with the positive electrode lug of the other bare cell.

In some embodiments, the conductive column is a copper-aluminum composite conductive column, and includes a copper connection portion and an aluminum connection portion, which are electrically connected with copper tabs and aluminum tabs of the bare cells on two sides respectively.

In some embodiments, the cell further comprises: the top cover is fixedly connected to one end, away from the middle connecting piece, of at least one shell; the top cover comprises a top cover body and a pole; the pole is electrically connected with the pole lug of the bare cell adjacent to the top cover to form an anode and a cathode of the single battery; the top cover body is fixedly connected with the shell and is configured to form a plurality of isolated cavities for accommodating the bare cells together with the shell and the middle connecting piece.

In some embodiments, the top cover further comprises: at least one of an explosion-proof valve, a liquid injection hole, a riveting block, upper plastic, lower plastic and a sealing ring. Wherein the explosion-proof valve and the liquid injection hole are arranged on the top cover body; the pole is arranged in the top cover body in a penetrating mode, and the riveting block is riveted with the pole to fix the pole to the top cover body; the upper plastic is arranged between the top cover body and the riveting block and used for insulating the top cover body from the riveting block; the lower plastic is arranged between the top cover body and the pole, and is used for insulating the top cover body from the pole; the sealing ring is sleeved on the pole, so that the pole and the penetrating position of the top cover body are insulated and sealed.

In some embodiments, the cell further comprises: the bare cell insulating piece is arranged between the shell and the bare cell.

The aim of the application can be achieved by adopting the following technical scheme. According to another aspect of the present application, there is provided a power battery pack including: the bag body and a plurality of single batteries as any one of the single batteries are arranged in the bag body.

The aim of the application can be achieved by adopting the following technical scheme. According to yet another aspect of the present application, there is provided a vehicle comprising a power cell pack as any one of the foregoing.

Compared with the prior art, the method has obvious advantages and beneficial effects. By means of the technical scheme, the single battery, the power battery pack and the vehicle can achieve quite technical progress and practicality, have wide industrial utilization value, and have at least the following advantages:

1. according to the single battery, at least two bare cells are integrated into one cell in an internal serial connection mode through the arrangement of the middle connecting piece, so that the voltage of the single battery is improved, the single battery is particularly suitable for a high-voltage system, and the use safety performance and the energy density of a battery pack of the high-voltage system can be improved;

2. according to the single battery, the middle connecting piece comprising the insulating piece and the sealing plastic is arranged, and particularly, the sealing plastic is arranged between the conductive column of the middle connecting piece and the metal partition plate, so that each bare cell is accommodated in a plurality of independent cavities in an isolated manner, electrolyte in each cavity is isolated and not circulated, oxidative decomposition of the electrolyte by series high voltage can be avoided, and even if accidents such as heating and burning occur to the bare cell and the electrolyte in a certain cavity, other cavities are not directly influenced, and the safety of the battery is improved;

3. by utilizing the single battery provided by the application, the grouping assembly efficiency of the battery pack can be improved, and the problems of difficult shell entering, low production efficiency, low yield and the like of the battery adopting the single long battery cell are solved.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification, so that the foregoing and other objects, features and advantages of the present application can be more clearly understood, and the following detailed description of the preferred embodiments will be given with reference to the accompanying drawings.

Drawings

Fig. 1 is an exploded perspective view of a battery cell according to one embodiment of the present application;

fig. 2 is a schematic front view of a unit cell according to an embodiment of the present application;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

fig. 4 is a partial enlarged view at B in fig. 3;

FIG. 5 is a partial enlarged view at C in FIG. 3;

FIG. 6 is an exploded perspective view of a center connection structure provided in one embodiment of the present application;

fig. 7 is an exploded perspective view of a top cover provided in one embodiment of the present application.

[ symbolic description ]

1 single battery

10 bare cell 20 shell

30 middle connector 41 first top cover

42 second top cover 50 bare cell insulating sheet

Negative electrode lug of 101 first bare cell and positive electrode lug of 102 second bare cell

301 conductive column 302 metal separator

303 first insulator 304 second insulator

305 sealing plastic

3011 copper connection 3012 aluminum connection

401 Top cover 402 pole

403 explosion-proof valve 404 liquid injection hole

405 plastic on riveting block 406

407 lower plastic 408 sealing ring

Detailed Description

In order to further describe the technical means and effects adopted by the present application to achieve the preset utility model, the following detailed description refers to the specific implementation, structure, characteristics and effects of the single battery according to the present application with reference to the accompanying drawings and preferred embodiments.

Referring to fig. 1 to 7, a battery cell 1 (may also be referred to as a battery cell) according to an example of the present application mainly includes: at least two die 10, a housing 20, and a center connector 30.

The bare cell 10 is also called a pole core, and may adopt, but not limited to, a roll core (JR). It should be noted that, although only two bare cells 10 are shown in fig. 1, three or more bare cells 10 may be provided in some examples of the present application, each bare cell 10 is connected end to end, and a middle connector 30 is provided between two adjacent bare cells 10.

The casing 20 is sleeved outside the bare cell 10. Generally, the shape and size of the housing 20 correspond to the shape and size of the bare cell 10. Alternatively, the housing 20 may be a rectangular parallelepiped-shaped sleeve, such as a knife-blade-shaped sleeve. In an alternative example, a corresponding housing 20 may be provided for each bare cell 10, where the number of housings 20 is the same as the number of bare cells 10, and the edges of the housing 20 corresponding to each bare cell 10 are fixedly connected with the corresponding middle connector 30 to form the housing of the unit battery 1 by splicing; alternatively, in another alternative example, only one case 20 may be provided to be sleeved outside all the bare cells 10 as a case of the entire unit cell 1.

Referring to fig. 1 or 3, the middle connector 30 is disposed between two adjacent die cells 10, and the middle connector 30 and the housing 20 are configured to form a plurality of independent cavities for accommodating the die cells 10, and the independent cavities are used for isolating the die cells 10. Through setting up middle part connecting piece 30, establish ties a plurality of short bare cell 10 in the inside of battery cell 1 in order to integrate into a long concatenation electric core to hold each bare cell 10 in a plurality of independent cavitys with keeping apart, make the voltage of battery cell 1 realize multiplying.

Referring to fig. 4 and 6, the middle connector 30 specifically includes: conductive posts 301, metal spacers 302, insulation, and sealing plastic 305.

Referring to fig. 4, two sides of the conductive post 301 are electrically connected with the tabs of the two corresponding bare cells 10, respectively, so as to electrically connect the negative tab 101 of the first bare cell on one side with the positive tab 102 of the second bare cell on the other side, so as to connect the bare cells 10 in series and splice. Optionally, two sides of the conductive post 301 are electrically connected to corresponding tabs of the corresponding bare cell 10 respectively. As an alternative example, the conductive post 301 is a copper-aluminum composite conductive post, and is formed by compositing a copper material and an aluminum material. Alternatively, the conductive post 301 may include a copper connection portion 3011 and an aluminum connection portion 3012, which are electrically connected to copper tabs and aluminum tabs of the bare cell 10 on both sides, respectively. It should be noted that the present application is not limited to a specific implementation of the electrical connection, including but not limited to soldering.

In some alternative embodiments of the present application, referring to fig. 2 and 3, the positive tab and the negative tab of each bare cell 10 are disposed at two ends of the bare cell 10 along the length direction L. Each bare cell 10 of the unit cell 1 is arranged along the length direction L. The positive electrode lugs and the negative electrode lugs of each bare cell 10 are respectively arranged at two ends, so that the series connection of a plurality of bare cells 10 is facilitated. The two sides of the conductive post 301 of the middle connector 30 are respectively electrically connected with the tabs of the two bare cells 10 to form an internal series blade cell structure.

The metal diaphragm 302 is fixedly connected to the housing 20. Optionally, the metal spacer 302 is attached to the housing 20 using a welding process. The weld is the location of contact of the metal diaphragm 302 with the housing 20, including but not limited to D in fig. 4. The metal spacer 302 and the housing 20 of the intermediate connector 30 are configured to form a plurality of separate cavities that house each die 10.

The insulating members are disposed on two sides of the metal separator 302 and between the metal separator 302 and the corresponding bare cell 10, so as to insulate the bare cell 10 from the metal separator 302. Alternatively, the insulating member may be insulating plastic. Alternatively, as shown in fig. 6, the insulating members may include a first insulating member 303 and a second insulating member 304 having an external dimension not smaller than the metal separator 302 and disposed on both sides of the metal separator 302, respectively.

In some alternative embodiments, the insulator and the metal spacer 302 may be provided with a snap-fit arrangement to allow for a relative fixation between the insulator and the metal spacer 302. For example, as shown in fig. 6, the metal separator 302 has a rectangular sheet structure, four corners of which are provided with recesses or holes, and four corners of the first insulating member 303 and the second insulating member 304 are provided with corresponding protrusions at corresponding positions, so that the insulating member is fixed to the metal separator 302 by cooperation of the recesses (or holes) and the protrusions.

The sealing plastic 305 is disposed between the conductive pillars 301 and the metal spacer 302, so that the conductive pillars 301 and the metal spacer 302 are insulated and sealed. Optionally, the sealing plastic 305 completely surrounds the conductive pillars 301, so that the conductive pillars 301 are isolated from the metal spacer 302.

As an alternative example, as shown in fig. 6, the metal separator 302 has a through hole, and the sealing plastic 305 has a ring structure, which is received inside the through hole of the metal separator 302, and the conductive post 301 is received inside the ring structure, so that the conductive post 301 is insulated and sealed from the metal separator 302. It should be noted that the insulating members disposed on two sides of the metal separator 302 may also be provided with corresponding through holes, so as to connect the conductive posts 301 in series, and also facilitate connection between the conductive posts 301 and the tabs.

Optionally, a sealing plastic 305 is formed between the conductive post 301 and the metal spacer 302 by an injection molding process, and fixes the conductive post 301 to the metal spacer 302, such that the conductive post 301, the sealing plastic 305, and the metal spacer 302 are formed as a single body, the sealing plastic 305 insulates the conductive post 301 from the metal spacer 302, and seals the conductive post 301 from the metal spacer 302.

The single battery 1 of the application can form the isolated cavity for accommodating each bare cell 10 by arranging the metal separator 302, the insulating member and the sealing plastic 305, and can isolate the electrolyte on two sides of the middle connecting member 30.

In some embodiments of the present application, the battery cell 1 further includes a top cover. Referring to fig. 1 and 3, in some examples, the unit cell 1 may include a first top cover 41 and a second top cover 42, where the first top cover 41 and the second top cover 42 are fixedly connected to two ends of the housing 20 away from the middle connector 30, that is, two ends of the spliced battery cell formed by connecting and splicing the respective bare cells 10 in series. It should be noted that, in other examples, the unit cell 1 may also include only one top cover, where the top cover is fixedly connected to an end of the housing 20 away from the middle connector 30, that is, an end of the split cell formed by connecting and splitting the respective bare cells 10 in series, and the other end may be encapsulated by a bottom sleeve-shaped housing 20.

Referring to fig. 5, the top cover may include a top cover body 401 and a pole 402.

The top cover bodies 401 of the first top cover 41 and the second top cover 42 are fixedly connected with the housing 20, respectively, and are configured to form a plurality of isolated cavities accommodating the respective bare cells 10 together with the housing 20 and the middle connector 30. Alternatively, the cap bodies 401 of the first and second caps 41 and 42 are welded to the housing 20, respectively. Alternatively, the top cover body 401 is rectangular sheet-like, and thus may also be referred to as a top cover sheet.

The post 402 is electrically connected to the tab of the bare cell 10 adjacent to the top cover to form the positive electrode and the negative electrode of the unit cell 1. That is, the terminal posts 402 at both ends are electrically connected to the tabs of the bare cell 10 at both ends, respectively. Alternatively, the pole 402 of the first top cover 41 is welded with the pole lug of the bare cell 10 adjacent to the first top cover 41, and the pole 402 of the second top cover 42 is welded with the pole lug of the bare cell 10 adjacent to the second top cover 42.

In some embodiments of the present application, referring to fig. 7, the first top cover 41 and/or the second top cover 42 further comprise: at least one of an explosion-proof valve 403, a liquid injection hole 404, a riveting block 405, an upper plastic 406, a lower plastic 407 and a sealing ring 408.

Wherein, explosion-proof valve 403, annotate liquid hole 404 and set up in top cap body 401 for realize annotating liquid and spout the valve pressure release function. In some alternative examples, an explosion-proof valve 403 and a liquid filling hole 404 may be provided in both the first top cover 41 and the second top cover 42. In other alternative examples, the explosion proof valve 403 and/or the injection hole 404 may be provided to the housing 20.

Optionally, the pole 402 is inserted into the top cover 401, and the aforementioned riveting block 405 is riveted with the pole 402 to fix the pole 402 to the top cover 401.

Optionally, an upper plastic 406 is disposed between the top cover 401 and the riveting block 405 for insulating the top cover 401 from the riveting block 405.

Optionally, a lower plastic 407 is disposed between the top cover 401 and the pole 402 for insulating the top cover 401 from the pole 402.

Optionally, the sealing ring 408 is sleeved on the pole 402, so that the pole 402 is insulated and sealed from the penetrating position of the top cover 401.

In some embodiments of the present application, as shown in fig. 1, the unit cell 1 may further include: the bare cell insulating sheet 50 is disposed between the case 20 and the bare cell 10, so as to insulate between the case 20 and the bare cell 10.

The application provides a battery cell 1, by casing 20, middle part connecting piece 30 and top cap form outside sealed, inside electric core have the structure of two at least cavitys, hold corresponding naked electric core 10 in the cavity, and the electrolyte of both sides can be kept apart to middle part connecting piece 30, is filled with the electrolyte but the electrolyte between each cavity is not intercommunicated in each cavity. Moreover, the single battery 1 provided by the application can ensure that the inside and the outside of the battery are completely isolated by arranging a plurality of types of insulating sealing components, and the safety of the battery is improved.

The embodiment of the application also provides a power battery pack, which mainly comprises: the bag body and the plurality of single batteries 1 provided in any one of the previous embodiments, wherein the single batteries 1 are arranged in the bag body.

Embodiments of the present application also provide a vehicle including a power cell pack as provided in any one of the embodiments described above.

The power battery pack and the vehicle provided by the application are all the single batteries 1 provided above, so that the beneficial effects of the power battery pack and the vehicle can be achieved by referring to the beneficial effects provided above, and the description is omitted here.

The foregoing description is not intended to limit the preferred embodiments of the present application, but is not intended to limit the scope of the present application, and any simple modification, equivalent variation and variation of the above embodiments according to the technical matter of the present application can be made by any person skilled in the art without departing from the scope of the technical solution of the present application.

Claims (10)

1. A single cell, characterized in that the single cell comprises:

at least two bare cells;

the shell is sleeved outside the bare cell; the method comprises the steps of,

the middle connecting piece is arranged between two adjacent bare cells;

wherein, the middle part connecting piece includes: the sealing plastic comprises a conductive column, a metal partition plate, an insulating piece and sealing plastic;

the two sides of the conductive column are respectively and electrically connected with the lugs of the corresponding two bare cells so as to connect the bare cells in series and splice the bare cells;

the metal separator is fixedly connected with the shell, and the metal separator and the shell are configured to form a plurality of cavities for accommodating bare cells;

the insulating pieces are arranged on two sides of the metal partition board and between the metal partition board and the corresponding bare cell;

the sealing plastic is arranged between the conductive column and the metal partition plate, so that the conductive column and the metal partition plate are insulated and sealed.

2. The cell as defined in claim 1, wherein:

the metal separator is provided with a through hole, the sealing plastic is of an annular structure, the annular structure is accommodated in the through hole of the metal separator, and the conductive column is accommodated in the annular structure;

the insulating piece is provided with a through hole, and the conductive column and the tab string pass through the through hole of the insulating piece to be electrically connected.

3. The unit cell according to claim 1 or 2, characterized in that:

the sealing plastic is formed between the conductive post and the metal separator through an injection molding process, and the conductive post is fixed on the metal separator, so that the conductive post, the sealing plastic and the metal separator are integrally formed.

4. The cell as defined in claim 1, wherein:

the positive electrode lug and the negative electrode lug of each bare cell are arranged at two ends of the bare cell along the length direction;

the at least two bare cells are distributed along the length direction;

one side of the conductive column is electrically connected with the negative electrode lug of one bare cell, and the other side of the conductive column is electrically connected with the positive electrode lug of the other bare cell.

5. The cell as defined in claim 1, wherein:

the conductive column is a copper-aluminum composite conductive column and comprises a copper connecting part and an aluminum connecting part which are respectively and electrically connected with copper lugs and aluminum lugs of bare electric cores at two sides.

6. The cell of claim 1, further comprising:

the top cover is fixedly connected to one end, away from the middle connecting piece, of at least one shell;

the top cover comprises a top cover body and a pole;

the pole is electrically connected with the pole lug of the bare cell adjacent to the top cover to form an anode and a cathode of the single battery;

the top cover body is fixedly connected with the shell and is configured to form a plurality of isolated cavities for accommodating the bare cells together with the shell and the middle connecting piece.

7. The cell of claim 6, wherein the top cover further comprises: at least one of an explosion-proof valve, a liquid injection hole, a riveting block, an upper plastic, a lower plastic and a sealing ring;

wherein the explosion-proof valve and the liquid injection hole are arranged on the top cover body;

the pole is arranged in the top cover body in a penetrating mode, and the riveting block is riveted with the pole to fix the pole to the top cover body;

the upper plastic is arranged between the top cover body and the riveting block and used for insulating the top cover body from the riveting block;

the lower plastic is arranged between the top cover body and the pole, and is used for insulating the top cover body from the pole;

the sealing ring is sleeved on the pole, so that the pole and the penetrating position of the top cover body are insulated and sealed.

8. The cell of claim 1, further comprising: the bare cell insulating piece is arranged between the shell and the bare cell.

9. A power battery pack comprising a pack body and a plurality of the single cells according to any one of claims 1 to 8, wherein the single cells are disposed in the pack body.

10. A vehicle comprising the power cell pack of claim 9.

Images