CN220856728U

CN220856728U - Battery pack

Info

Publication number: CN220856728U
Application number: CN202322149319.8U
Authority: CN
Inventors: 赵冬; 马俊杰
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-08-10
Filing date: 2023-08-10
Publication date: 2024-04-26
Anticipated expiration: 2033-08-10

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack, which comprises a bottom support and a plurality of batteries arranged on the bottom support, wherein the batteries comprise a shell, electrolyte and a battery core which are arranged in the shell, the content of free electrolyte in the shell is 0.2g-5g, and the shell comprises: the cover plate is arranged on the bottom support so as to support the battery cell; the shell part is welded with the cover plate. The apron sets up and is used for supporting the electric core on the bottom sprag, and the apron is as the support of electric core promptly, and inside electrolyte receives gravity effect, leads to free electrolyte to generally gather in the battery bottom, and casing spare and apron welded connection position department contact electrolyte, and the material can take place to fall to expect in electric core bottom, through the free electrolyte content control in the casing be 0.2g-5g, not only can reduce the casing spare and apron welded connection position department by the risk of corruption, and can guarantee the follow-up holistic cycle life of battery, has improved the performance of battery reliably from this.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

In the related art, the battery pack may include a plurality of batteries, and the plurality of batteries may be placed on a bottom support of the case, thereby achieving support for the batteries. Considering the placement of the battery, the electrolyte in the battery case may cause damage to the case.

Disclosure of utility model

The utility model provides a battery pack to improve the service performance of the battery pack.

The utility model provides a battery pack, which comprises a bottom support and a plurality of batteries arranged on the bottom support, wherein the batteries comprise a shell, electrolyte and an electric core which are arranged in the shell, the content of free electrolyte in the shell is 0.2g-5g, and the shell comprises:

the cover plate is arranged on the bottom support so as to support the battery cell;

the shell part is welded with the cover plate.

The battery pack of the embodiment of the utility model comprises a bottom support and a plurality of batteries, wherein the batteries are arranged on the bottom support, so that the bottom support supports the batteries. The casing of battery includes apron and casing spare, casing spare and apron welded connection, and then guarantee the connection stability of casing spare and apron, and be provided with electrolyte and electric core in the casing, and the apron sets up and is used for supporting the electric core on bottom sprag, the apron is as the support of electric core promptly, inside electrolyte receives the action of gravity, lead to free electrolyte to generally gather in the battery bottom, casing spare and apron welded connection position department contact electrolyte, the material can take place for the electric core bottom, through the free electrolyte content control in the casing be 0.2g-5g, not only can reduce the risk that casing spare and apron welded connection position department are corroded, and can guarantee the follow-up holistic life of battery, thereby reliably improved the performance of battery.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. Wherein:

fig. 1 is a schematic view illustrating a structure of a battery pack according to an exemplary embodiment;

Fig. 2 is a schematic view illustrating a structure of a battery pack according to an exemplary embodiment;

fig. 3 is an exploded structural view illustrating a battery cell of a battery pack according to an exemplary embodiment.

The reference numerals are explained as follows:

10. A bottom support; 20. a battery; 21. a housing; 211. a cover plate; 212. a housing member; 2121. a sidewall portion; 2122. a bottom wall portion; 22. a pole assembly; 23. a battery cell; 24. a liquid absorbing member; 25. an insulating support; 26. an explosion-proof valve.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, 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 unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

An embodiment of the present utility model provides a battery pack, referring to fig. 1 to 3, the battery pack includes a bottom support 10 and a plurality of batteries 20 disposed on the bottom support 10, the batteries 20 including a case 21 and an electrolyte and a cell 23 disposed in the case 21, the free electrolyte content in the case 21 being 0.2g-5g, the case 21 including: the cover plate 211, the cover plate 211 is set up on the bottom support 10, in order to support the electric core 23; the housing member 212, the housing member 212 and the cover plate 211 are welded.

The battery pack of one embodiment of the present utility model includes a bottom support 10 and a plurality of cells 20, the plurality of cells 20 being disposed on the bottom support 10 such that the bottom support 10 provides support for the cells 20. The casing 21 of the battery 20 comprises a cover plate 211 and a casing member 212, the casing member 212 is welded with the cover plate 211, so that the connection stability of the casing member 212 and the cover plate 211 is guaranteed, electrolyte and a battery cell 23 are arranged in the casing 21, the cover plate 211 is arranged on the bottom support 10 and is used for supporting the battery cell 23, namely, the cover plate 211 is used as the support of the battery cell 23, the electrolyte is subjected to the action of gravity, so that free electrolyte generally accumulates at the bottom of the battery, the position where the casing member 212 is welded with the cover plate 211 is contacted with the electrolyte, the bottom of the battery cell 23 can be subjected to material dropping, the risk of corrosion at the position where the casing member 212 is welded with the cover plate 211 can be reduced, the cycle life of the subsequent whole battery can be guaranteed, and the service performance of the battery can be reliably improved.

It should be noted that, as shown in fig. 1, the battery 20 is disposed on the bottom support 10, the bottom support 10 forms a support for the battery 20, and the cover 211 is disposed on the bottom support 10, that is, the cover 211 is located at the bottom of the battery 20 to form a support for the battery cell 23, where the electrolyte in the housing 21 is subjected to gravity, so that the free electrolyte generally accumulates at the bottom of the battery, that is, the free electrolyte accumulates at the connection position between the cover 211 and the housing member 212, and the bonding wire formed by welding the seal between the housing member 212 and the cover 211 contacts the electrolyte, and there is a risk of corrosion of the housing 21 in consideration of material dropping at the bottom of the battery cell 23. The greater the free electrolyte content in the housing 21, the more serious the risk of corrosion of the housing 21; while a smaller free electrolyte content in the housing 21 affects the subsequent overall cycle life of the battery. By controlling the free electrolyte content in the case 21 to be 0.2g to 5g, the risk of the occurrence of the above situation can be effectively reduced.

The battery 20 includes a housing 21 and an electrolyte and a cell 23 disposed within the housing 21, the electrolyte forming a wet-out to the cell 23, the electrolyte being gradually consumed during battery cycling. After the electrolyte is injected into the housing 21, a part of the electrolyte may directly infiltrate into the cell 23, and a part of the electrolyte may be dissociated outside the cell 23, for example, the electrolyte may be directly dissociated in the housing 21, or the electrolyte absorbed by the liquid absorbing member 24 may be also referred to as a dissociated electrolyte.

The free electrolyte may be any electrolyte that remains after the cell 23 is removed, including the sum of the electrolyte directly within the housing 21 and the electrolyte absorbed by the wick 24.

The cell 23 can be taken out and the weight of the remaining electrolyte can be obtained at the time of measurement of the free electrolyte, and the free electrolyte can be considered to be substantially unconsumed when the number of cycles of the battery is small.

The free electrolyte content in the housing 21 may be 0.2g、0.3g、0.4g、0.5g、0.7g、0.8g、0.9g、1g、1.2g、1.3g、1.4g、1.5g、1.7g、1.8g、1.9g、2g、2.5g、3g、3.2g、3.5g、3.8g、4g、4.2g、4.3g、4.5g、4.7g、4.8g、4.9g or 5g, etc.

In one embodiment, the battery is a ternary lithium battery, the content of free electrolyte is more than or equal to 0.2g, and the corrosion probability of the shell 21 can be effectively reduced on the basis of guaranteeing the cycle life of the ternary lithium battery.

In one embodiment, the battery is a lithium iron phosphate battery, the content of free electrolyte is more than or equal to 0.5g, the risk of corrosion of the shell 21 can be controlled, the cycle life of the ternary lithium battery can be effectively controlled, and the service life of the battery is prolonged.

In one embodiment, the housing member 212 is connected with the cover plate 211 by laser welding, so that not only the stability of the welding connection between the housing member 212 and the cover plate 211 can be ensured, the welding efficiency of the housing member 212 and the cover plate 211 can be improved, but also the corrosion probability of the housing 21 can be reduced.

It should be noted that, the case member 212 and the cover plate 211 may be resistance welded, or the case member 212 and the cover plate 211 may be ultrasonically welded, etc.

In one embodiment, as shown in fig. 3, the housing member 212 includes a side wall portion 2121 and a bottom wall portion 2122, the side wall portion 2121 and the bottom wall portion 2122 are integrally formed, the cover plate 211 is welded to the side wall portion 2121, and the cover plate 211 is disposed opposite to the bottom wall portion 2122, so that the housing member 212 and the cover plate 211 form a protection for the battery cell 23, and the connection stability of the cover plate 211 and the housing member 212 can be ensured.

The case member 212 includes a side wall portion 2121 and a bottom wall portion 2122, and the side wall portion 2121 and the bottom wall portion 2122 are integrally formed, so that structural safety of the case 21 can be improved while ensuring battery manufacturing efficiency.

In one embodiment, as shown in fig. 2 and 3, the battery further includes a pole assembly 22, where the pole assembly 22 is disposed on the housing member 212, the pole assembly 22 is electrically connected with the battery cell 23, and the pole assembly 22 uses the space of the housing member 212 to improve the supporting performance of the pole assembly 22.

In one embodiment, the pole assembly 22 is disposed on the opposite side of the housing member 212 from the cover plate 211, such that the pole assembly 22 may be disposed toward the top of the battery, facilitating electrical connection of the plurality of pole assemblies 22 of the battery pack through the buss bars.

The housing member 212 includes a side wall portion 2121 and a bottom wall portion 2122, and the post assembly 22 can be disposed on the bottom wall portion 2122.

In one embodiment, as shown in fig. 3, the battery further includes a liquid absorbing member 24, where the liquid absorbing member 24 is disposed in the housing 21, and the liquid absorbing member 24 is located between the electric core 23 and the cover 211, so that the liquid absorbing member 24 can absorb the electrolyte in the housing 21, thereby realizing storage of free electrolyte.

After the electrolyte is injected into the battery, the electrolyte can be absorbed by the liquid absorbing piece 24, and in the process of recycling the battery, the electrolyte in the liquid absorbing piece 24 can be absorbed by the battery core 23, so that the normal circulation of the battery core 23 is ensured.

The electrolyte in the liquid absorbing member 24 is also part of the free electrolyte, without excluding that the free electrolyte in the cell is absorbed by the liquid absorbing member 24.

The liquid absorbing member 24 may be a sponge, or a water absorbing resin or other material with liquid absorbing capability, and is made into a single structure or a composite structure, and the absorption of electrolyte can be realized by utilizing the liquid absorbing characteristic of the liquid absorbing member 24.

In one embodiment, the porosity of the liquid absorbing member 24 is greater than or equal to 5PPI, so that the liquid absorbing member 24 can fully absorb the electrolyte, and the amount of the electrolyte directly released into the shell 21 is reduced, thereby improving the safe use performance of the battery. Wherein PPI is expressed as pores per inch.

The porosity of the absorbent article 24 may be 5PPI, 6PPI, 7PPI, 8PPI, 10PPI, 15PPI, or 20PPI, among others.

In one embodiment, as shown in fig. 3, the battery further includes an insulating support member 25, the insulating support member 25 is disposed in the housing 21, and the insulating support member 25 is located between the battery cell 23 and the cover plate 211, so that insulation isolation between the battery cell 23 and the cover plate 211 can be achieved, and the insulating support member 25 can form structural reinforcement to the cover plate 211, thereby improving safety performance of the battery 20.

The insulating support 25 may be a plate body, the insulating support 25 may be a plastic plate body, or the insulating support 25 may be a rubber plate body, etc., which is not limited herein.

In one embodiment, as shown in fig. 3, the battery further includes a liquid absorbing member 24, the liquid absorbing member 24 is disposed in the housing 21, and the liquid absorbing member 24 is located between the battery cell 23 and the cover 211; the liquid absorbing member 24 is disposed around the insulating support member 25, so that the liquid absorbing member 24 can absorb the electrolyte, and the liquid absorbing member 24 can utilize a gap between the insulating support member 25 and the housing 21, thereby improving the space utilization rate of the battery and further ensuring the energy density of the battery.

In one embodiment, the battery further includes an explosion-proof valve 26, where the explosion-proof valve 26 is disposed on the cover 211, so that the explosion-proof valve 26 can be disposed towards the bottom support 10, reducing the impact on the passenger compartment after the explosion of the explosion-proof valve 26, and improving the safety performance of the battery pack to a certain extent.

In one embodiment, as shown in fig. 2 and 3, the battery further includes an explosion-proof valve 26, where the explosion-proof valve 26 is disposed on the housing member 212, so that the explosion-proof valve 26 is avoided from being disposed on the bottom support 10, and the bottom support 10 is prevented from shielding the explosion-proof valve 26, thereby ensuring that the explosion-proof valve 26 can be normally exploded, further improving the safety performance of the battery pack, and avoiding the problem of thermal runaway.

In one embodiment, the explosion proof valve 26 is disposed at a side of the case member 212 opposite to the cover plate 211, so that the explosion proof valve 26 can use the top space of the battery pack to improve the safety use performance of the battery pack.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

In one embodiment, the battery 20 may be a quadrangular-type battery, which mainly refers to a prismatic shape, but does not strictly define whether each side of the prism is necessarily a strictly straight line, and the corners between the sides are not necessarily right angles, and may be arc transitions.

The battery can be a laminated battery, so that the battery is not only convenient to group, but also long in length. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Or the battery can be a winding type battery, namely, a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

In one embodiment, the battery 20 may be a cylindrical battery, or the battery may be a hexagonal-prism-type battery. The battery can be a winding type battery, namely, a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

It should be noted that the bottom support 10 may be a bottom structure of the battery box, for example, the bottom support 10 may be a heat exchange component, or the bottom support 10 may be a bottom plate of the battery box, etc., which is not limited herein, and the bottom support 10 may be embodied to support the battery.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries.

It should be noted that, a plurality of batteries may be disposed in the battery case after forming the battery module, and may be fixed by the end plate and the side plate. The plurality of cells may be disposed directly in the cell case, i.e., without grouping the plurality of cells, at which time the end plates and the side plates may be removed.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery comprising a base support (10) and a plurality of cells (20) disposed on the base support (10), the cells (20) comprising a housing (21) and an electrolyte and a cell (23) disposed in the housing (21), the free electrolyte content in the housing (21) being 0.2g-5g, the housing (21) comprising:

A cover plate (211), the cover plate (211) being arranged on the bottom support (10) to support the battery cell (23);

-a housing part (212), said housing part (212) being welded to said cover plate (211).

2. The battery of claim 1, wherein the battery is a ternary lithium battery.

3. The battery pack according to claim 1, wherein the battery is a lithium iron phosphate battery, and the free electrolyte content is not less than 0.5g.

4. The battery according to claim 1, characterized in that the housing part (212) is laser welded to the cover plate (211).

5. The battery pack according to claim 1, wherein the case member (212) includes a side wall portion (2121) and a bottom wall portion (2122), the side wall portion (2121) and the bottom wall portion (2122) are of an integrally formed type structure, the cover plate (211) is welded to the side wall portion (2121), and the cover plate (211) is disposed opposite to the bottom wall portion (2122).

6. The battery according to any one of claims 1 to 5, wherein the battery further comprises a post assembly (22), the post assembly (22) being disposed on the housing member (212).

7. The battery according to claim 6, wherein the post assembly (22) is disposed on a side of the housing member (212) opposite the cover plate (211).

8. The battery according to any one of claims 1 to 5, further comprising a liquid absorbing member (24), the liquid absorbing member (24) being disposed within the housing (21), the liquid absorbing member (24) being located between the electric core (23) and the cover plate (211).

9. The battery according to claim 8, wherein the porosity of the wick (24) is not less than 5PPI.

10. The battery according to any one of claims 1 to 5, characterized in that the battery further comprises an insulating support (25), the insulating support (25) being arranged within the housing (21), the insulating support (25) being located between the cells (23) and the cover plate (211).

11. The battery pack according to claim 10, wherein the battery further comprises a liquid absorbing member (24), the liquid absorbing member (24) being disposed within the housing (21), the liquid absorbing member (24) being located between the electric core (23) and the cover plate (211);

wherein the liquid absorbing member (24) is disposed around the insulating support member (25).

12. The battery according to any one of claims 1 to 5, characterized in that the battery further comprises an explosion-proof valve (26), the explosion-proof valve (26) being provided on the cover plate (211).

13. The battery according to any one of claims 1 to 5, wherein the battery further comprises an explosion-proof valve (26), the explosion-proof valve (26) being provided on the housing member (212).

14. The battery pack according to claim 13, wherein the explosion-proof valve (26) is provided on a side of the case member (212) opposite to the cover plate (211).

15. The battery according to any one of claims 1 to 5, wherein the battery (20) is a quadrangular-type battery.