CN219371270U

CN219371270U - Battery pack

Info

Publication number: CN219371270U
Application number: CN202320568586.6U
Authority: CN
Inventors: 赵冬
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-07-18
Anticipated expiration: 2033-03-21

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack, which comprises: a bottom support formed with an exhaust passage; the batteries are arranged on the bottom support, and a pressure relief structure is arranged on one side of the battery facing the bottom support; the height of the exhaust channel is h along the height direction of the battery, the capacity of the battery is A, the A/h is less than or equal to 1A/h and less than or equal to 30A/mm, the exhaust channel can timely exhaust gas inside the battery after the pressure relief structure is exploded, safety risks between adjacent batteries are avoided, and the space utilization rate of the battery pack can be guaranteed.

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, a battery pack may include a plurality of batteries, which may generate a lot of heat during the charge and discharge process, and in some cases, the batteries need to be vented through the explosion of a pressure release structure to ensure the safe service performance of the batteries, however, due to the structural limitation of the battery pack, the gas venting capability may be affected, thereby affecting the safety performance of the battery pack.

Disclosure of Invention

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

The present utility model provides a battery pack including:

a bottom support formed with an exhaust passage;

the batteries are arranged on the bottom support, and a pressure relief structure is arranged on one side of the battery facing the bottom support;

the height of the exhaust channel is h along the height direction of the battery, the capacity of the battery is A, and A/h is less than or equal to 1A/h and less than or equal to 30A/h/mm.

The battery pack comprises the bottom support and the plurality of batteries, the plurality of batteries are arranged on the bottom support, and the exhaust channel is formed on the bottom support, and the pressure release structure of the batteries is arranged towards the bottom support, so that after the pressure release structure is exploded, gas in the batteries can enter the exhaust channel, thereby avoiding affecting adjacent batteries, improving the safety performance of the battery pack, and in the height direction of the batteries, the height of the exhaust channel is h, the capacity of the batteries is A, A/mm is less than or equal to 1A/h and less than or equal to 30A/mm, and not only can the exhaust channel ensure that the gas in the batteries can be discharged in time after the pressure release structure is exploded, and the safety risk between the adjacent batteries is avoided, but also the space utilization rate of the battery pack can be ensured.

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 an exploded structural view of a battery pack according to an exemplary embodiment;

fig. 3 is a schematic structural view of a battery pack according to another exemplary embodiment;

fig. 4 is a schematic view illustrating a structure of a bottom support of a battery pack according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a bottom support; 11. an exhaust passage; 111. a sub-channel; 20. a battery; 21. a pressure relief structure; 30. a battery box.

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 4, including: a bottom support 10, the bottom support 10 being formed with an exhaust passage 11; a plurality of batteries 20, wherein the batteries 20 are arranged on the bottom support 10, and a pressure release structure 21 is arranged on one side of the batteries 20 facing the bottom support 10; wherein, along the height direction of the battery 20, the height of the exhaust channel 11 is h, the capacity of the battery 20 is A, and A/h is less than or equal to 1A/mm and less than or equal to 30A/mm.

The battery pack according to one embodiment of the utility model comprises a bottom support 10 and a plurality of batteries 20, wherein the batteries 20 are arranged on the bottom support 10, and an exhaust channel 11 is formed on the bottom support 10, and a pressure release structure 21 of each battery 20 is arranged towards the bottom support 10, so that after the pressure release structure 21 is exploded, gas in each battery 20 can enter the corresponding exhaust channel 11, thereby avoiding affecting adjacent batteries 20 and improving the safety performance of the battery pack, and in the height direction of each battery 20, the height of each exhaust channel 11 is h, the capacity of each battery 20 is A, A/h is less than or equal to 1Ah/mm and less than or equal to 30Ah/mm, and therefore, the exhaust channel 11 can discharge gas in each battery 20 in time after the pressure release structure 21 is exploded, safety risks between adjacent batteries 20 are avoided, and the space utilization of the battery pack can be ensured.

It should be noted that, the battery 20 has a pressure release structure 21, the pressure release structure 21 is disposed towards the bottom support 10, the pressure release structure 21 may be an explosion-proof valve, an air valve, a pressure release valve or a safety valve, and when the internal pressure of the battery 20 reaches a certain height, the pressure release structure 21 is opened, so as to realize pressure release inside the battery 20.

Through making relief structure 21 set up towards bottom sprag 10, after relief structure 21 opens, by inside exhaust gas of battery 20 and the liquid be difficult to rise to the top of group battery, security performance when can improving the group battery to a certain extent.

As shown in fig. 3, in the height direction of the battery 20, the height of the exhaust channel 11 is denoted as h, and the capacity of the battery 20 is denoted as a, that is, the capacity of each battery 20 is denoted as a, and by making the ratio between the capacity a of the battery 20 and the height h of the exhaust channel 11 be 1Ah/mm-30Ah/mm, the relationship between the capacity of the battery 20 and the height of the exhaust channel 11 can be effectively controlled, so that after the pressure release structure 21 is opened, the exhaust channel 11 can timely discharge the gas inside the battery 20, thereby avoiding the safety risk between adjacent batteries 20, and also ensuring the space utilization of the battery pack, thereby improving the service performance of the battery pack. The height direction of the battery 20 may be denoted as X.

When the ratio between the capacity a of the battery 20 and the height h of the exhaust channel 11 is greater than 30Ah/mm, after the pressure release structure 21 is exploded, the problem that the exhaust channel 11 cannot timely exhaust the gas inside the battery may occur, so that the gas may affect the adjacent battery 20, and further a safety risk may occur; when the ratio between the capacity a of the battery 20 and the height h of the exhaust channel 11 is less than 1Ah/mm, the exhaust channel 11 occupies a larger space inside the battery pack, thereby affecting the space utilization of the battery pack, and the problem of weaker structural strength of the bottom support 10 may also occur, thereby having a safety risk.

The ratio between the capacity A of the battery 20 and the height h of the exhaust passage 11 may be 1Ah/mm, 2Ah/mm, 3Ah/mm, 4Ah/mm, 5Ah/mm, 10Ah/mm, 15Ah/mm, 16Ah/mm, 20Ah/mm, 21Ah/mm, 22Ah/mm, 24Ah/mm, 25Ah/mm, 26Ah/mm, 27Ah/mm, 28Ah/mm, 29Ah/mm, 30Ah/mm, or the like.

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.

Alternatively, the battery may be a wound battery in which a first pole piece, a second pole piece opposite in electrical property to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

In one embodiment, the battery 20 may be a cylindrical 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.

In one embodiment, the capacity of the battery 20 is A,20Ah is less than or equal to A is less than or equal to 50Ah, i.e., the capacity range of the battery 20 can be 20Ah-50Ah, thereby ensuring that the battery 20 can have reliable charging and discharging capacities and ensuring the service performance of the battery pack.

The battery 20 may be a cylindrical battery, and the capacity a of the battery 20 may be 20Ah, 21Ah, 22Ah, 25Ah, 26Ah, 27Ah, 28Ah, 30Ah, 31Ah, 32Ah, 35Ah, 36Ah, 37Ah, 38Ah, 39Ah, 40Ah, 41Ah, 42Ah, 43Ah, 45Ah, 46Ah, 47Ah, 48Ah, 50Ah, or the like.

In one embodiment, the height of the exhaust channel 11 is h, and h is 2mm less than or equal to 20mm along the height direction of the battery 20, that is, the height of the exhaust channel 11 can be 2mm-20mm, so that the problem that the exhaust channel 11 is too large to occupy too much battery space can be avoided on the basis of ensuring that the exhaust channel 11 has reliable exhaust capability.

The height h of the exhaust passage 11 may be 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 9mm, 10mm, 12mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, or the like.

In one embodiment, the number of the plurality of batteries 20 is n, and the volume of the exhaust passage 11 is V,0.1Ah/mm ³ ≤nA/V≤100Ah/mm ³ And n is 300-1200, the number of the batteries 20 included in the battery pack is 300-1200, thereby ensuring that the battery pack can have a reliable capacity, and the volume of the exhaust passage 11 is used for ensuring the exhaust capacity of the battery pack, thereby improving the safety use performance of the battery pack.

The number of the plurality of batteries 20 is n, the capacity of the batteries 20 is A, nA is the whole capacity of the battery pack, and the whole capacity of the exhaust passage 11 is V, namely the gas volume which the exhaust passage 11 can accommodate can be V, by making the ratio of the whole capacity nA of the battery pack to the whole capacity V of the exhaust passage 11 be 0.1Ah/mm ³ -100Ah/mm ³ The capacity of the battery pack can be guaranteed, the exhaust capacity of the battery pack is improved, the space utilization rate of the battery pack can be guaranteed, and the capacity density of the battery pack is guaranteed.

The ratio of the overall capacity nA of the battery pack to the overall capacity V of the exhaust passage 11 may be 0.1Ah/mm ³ 、0.2Ah/mm ³ 、0.3Ah/mm ³ 、0.5Ah/mm ³ 、0.8Ah/mm ³ 、1Ah/mm ³ 、5Ah/mm ³ 、10Ah/mm ³ 、15Ah/mm ³ 、18Ah/mm ³ 、20Ah/mm ³ 、22Ah/mm ³ 、25Ah/mm ³ 、30Ah/mm ³ 、35Ah/mm ³ 、40Ah/mm ³ 、45Ah/mm ³ 、50Ah/mm ³ 、55Ah/mm ³ 、60Ah/mm ³ 、65Ah/mm ³ 、70Ah/mm ³ 、75Ah/mm ³ 、80Ah/mm ³ 、85Ah/mm ³ 、90Ah/mm ³ 、95Ah/mm ³ 、98Ah/mm ³ Or 100Ah/mm ³ Etc.

The number n of the plurality of batteries 20 may be 300, 310, 320, 330, 350, 380, 400, 450, 500, 520, 528, 600, 650, 700, 750, 792, 800, 900, 1000, 1050, 1100, 1150, 1200, or the like.

The plurality of batteries 20 may form a plurality of battery rows, the plurality of batteries 20 may form an array structure, and the arrangement of the plurality of batteries 20 is not limited herein and may be selected according to actual requirements.

In one embodiment, the battery 20 is a cylindrical battery, and the diameter of the battery 20 is 40mm-80mm, so that the battery 20 can be ensured to have a relatively large size, and the capacity of the battery 20 can be ensured.

The diameter of the battery 20 may range from 40mm to 80mm, for example, the diameter of the battery 20 may be 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, or the like.

In one embodiment, the plurality of cells 20 form a plurality of cell strings, and the exhaust passage 11 includes a plurality of sub-passages 111, and the plurality of sub-passages 111 are disposed corresponding to the plurality of cell strings, so that it is possible to ensure that each cell string can realize gas discharge through the corresponding sub-passage 111, thereby improving the safety performance of the battery pack.

As shown in connection with fig. 4, the exhaust passage 11 may be composed of a plurality of sub-passages 111. The plurality of sub-channels 111 may correspond to a plurality of battery strings, respectively, each battery string including a plurality of batteries 20, the plurality of sub-channels 111 may be in communication, or the plurality of sub-channels 111 may not be in communication, which is not limited herein, e.g., the plurality of sub-channels 111 may ultimately lead into an integral gas collection chamber.

The specific structure of the sub-channel 111 is not limited herein, for example, the sub-channel 111 may include a rectangular channel and an opening, and the pressure relief structure 21 may be disposed opposite to the opening of the sub-channel 111, so as to ensure that the pressure relief structure 21 can be reliably exploded, thereby improving the protection performance of the pressure relief structure 21 for the battery 20.

In one embodiment, the vent passage 11 is formed by the bottom support 10 only, i.e., the bottom support 10 itself has one vent passage 11 to allow venting of the battery.

The bottom support 10 may be a bracket, for example, a plurality of batteries 20 may be provided on the bracket, the battery pack may further include a battery case, and the plurality of batteries 20 may be mounted in the battery case through the bottom support 10. The inside of the bracket is provided with the exhaust passage 11, and the gas exhausted from the battery 20 can be exhausted through the bracket, so that the overall structure of the battery pack can be simplified to a certain extent.

The bottom support 10 may be a bottom structure of a battery case in which a plurality of batteries 20 may be disposed. The bottom structure of the battery case has a vent passage 11.

In one embodiment, as shown in fig. 1, the battery pack further includes a battery case 30, the bottom support 10 is disposed in the battery case 30, and the exhaust passage 11 is formed by the bottom support 10 and the battery case 30, i.e., the exhaust passage 11 may be provided between the bottom support 10 and the battery case 30, thereby increasing the exhaust path of the exhaust passage 11, and improving the safety performance of the battery pack to some extent.

A plurality of batteries 20 may be disposed in the battery case 30 through the bottom support 10, for example, the bottom support 10 may have a chamber that may be in communication with an inner space of the battery case 30, and may be discharged through the battery case 30 after gas is introduced into the chamber.

In one embodiment, the ratio of the height of the battery 20 to the height of the exhaust channel 11 is 0.5-100, so that the space occupied by the exhaust channel 11 can be reliably controlled, and the problem that the exhaust channel 11 occupies too much space of the battery pack can be avoided on the basis that the exhaust channel 11 can reliably exhaust gas, thereby ensuring the energy density of the battery pack and ensuring the safe use performance of the battery pack.

The ratio of the height of the battery 20 to the height of the exhaust passage 11 may be 0.5, 0.6, 0.8, 1, 1.5, 2, 3, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 98, or 100, etc.

In one embodiment, the bottom support 10 may have a substantially rectangular structure, the bottom support 10 may have a recess for accommodating the battery 20, for example, the battery 20 may be cylindrical batteries, and each cylindrical battery may be disposed in each recess of the bottom support 10, thereby limiting the cylindrical battery, and ensuring safety and stability of the cylindrical battery, and the bottom of the recess may have a through hole communicating with the exhaust passage 11, thereby enabling the pressure release structure 21 of the battery 20 to be exploded under a certain pressure, and gas inside the battery 20 may enter the exhaust passage 11, thereby ensuring safe use performance of the battery pack, and avoiding the problem of gas diffusion everywhere.

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 pack, comprising:

-a bottom support (10), the bottom support (10) being formed with an exhaust channel (11);

a plurality of batteries (20), wherein the batteries (20) are arranged on the bottom support (10), and a pressure release structure (21) is arranged on one side of the batteries (20) facing the bottom support (10);

the height of the exhaust channel (11) is h along the height direction of the battery (20), and the capacity of the battery (20) is A, wherein A/mm is more than or equal to 1Ah/mm and less than or equal to 30Ah/mm.

2. The battery pack according to claim 1, wherein the battery (20) is a cylindrical battery.

3. The battery of claim 1, wherein 20Ah is less than or equal to a is less than or equal to 50Ah.

4. The battery of claim 1, wherein 2 mm.ltoreq.h.ltoreq.20 mm.

5. The battery pack according to claim 1, wherein the number of the plurality of the cells (20) is n, the volume of the exhaust passage (11) is V,0.1Ah/mm ³ ≤nA/V≤100Ah/mm ³ ，300≤n≤1200。

6. The battery pack according to claim 5, wherein the battery (20) is a cylindrical battery, and the diameter of the battery (20) is 40mm-80mm.

7. The battery pack according to any one of claims 1 to 6, wherein a plurality of the cells (20) form a plurality of cell rows, the exhaust passage (11) includes a plurality of sub-passages (111), and the plurality of sub-passages (111) are provided corresponding to the plurality of cell rows.

8. The battery according to any one of claims 1 to 6, characterized in that the exhaust channel (11) is formed by the bottom support (10) only.

9. The battery pack according to any one of claims 1 to 6, further comprising a battery case (30), the bottom support (10) being disposed within the battery case (30), the exhaust passage (11) being formed by the bottom support (10) and the battery case (30).

10. The battery according to any one of claims 1 to 6, characterized in that the ratio of the height of the battery (20) to the height of the exhaust channel (11) is 0.5-100.