CN218677355U

CN218677355U - Power battery and vehicle

Info

Publication number: CN218677355U
Application number: CN202222823132.7U
Authority: CN
Inventors: 殷立梅; 马猛超; 唐阳洋; 苗宇航
Original assignee: Hanhai Information Technology Shanghai Co Ltd
Current assignee: Hanhai Information Technology Shanghai Co Ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-03-21
Anticipated expiration: 2032-10-25

Abstract

The present disclosure relates to a power battery and a vehicle, the power battery including: an electric core; the battery comprises a shell, a battery body and a battery cover, wherein the shell comprises a shell main body for accommodating a battery core and a cover body for closing an opening of the shell main body; and a BMS module disposed in the case at one side adjacent to the cover; and the BMS module is provided with at least one pressure relief channel communicated with the pressure relief part. In the power battery that this disclosure provided, the pressure release portion is the weak position of casing seal, can play the pressure release effect, and power battery is inside to set up pressure release channel, and when power battery internal gas pressure was too big, gaseous accessible pressure release channel and pressure release portion in time discharge, and battery thermal runaway gas can outwards be discharged according to predetermined route, avoids gaseous piling up the emergence explosion in the battery, and whole pressure release stable in structure can not receive external impact.

Description

Power battery and vehicle

Technical Field

The present disclosure relates to the field of power batteries, and in particular, to a power battery and a vehicle.

Background

The power battery is easy to generate gas under the condition of external impact or improper use, the danger of combustion or explosion occurs, particularly in the sharing business, the environment of the power battery is used badly, the method of an operator is changeable, the fuel events of the power battery occur frequently, the damage to the operator exists, and the combusted power battery can ignite the peripheral power battery to cause asset loss. In order to avoid the situation, in the related art, the pressure relief effect is achieved by pasting the waterproof breathable film on the outer portion of the power battery shell, but the waterproof breathable film is easy to damage due to external impact, and the sealing performance is affected.

SUMMERY OF THE UTILITY MODEL

The first purpose of this disclosure is to provide a power battery, this power battery can produce when a large amount of gas initiate the explosion when power battery is impaired, discharges gas smoothly, alleviates power battery explosion, avoids causing the injury to the personnel.

A second object of the present disclosure is to provide a vehicle including the power battery provided by the present disclosure.

In order to achieve the above object, the present disclosure provides a power battery including:

an electric core;

the battery comprises a shell, a battery body and a battery cover, wherein the shell comprises a shell main body for accommodating the battery core and a cover body for closing an opening of the shell main body; and

the BMS module is arranged in the shell and positioned at one side close to the cover body;

and the BMS module is provided with at least one pressure relief channel communicated with the pressure relief part.

Optionally, the sealing element is made of an elastic material, and the sealing element at least has a first portion and a second portion in the circumferential direction of the sealing element, the thickness of the first portion is smaller than that of the second portion, and the relief portion is formed at a position corresponding to the first portion.

Optionally, the pressure relief portion is a notch disposed on the fitting surface of the case main body or the fitting surface of the cover body, the notch is a groove disposed on the fitting surface of the cover body, and the groove extends in the thickness direction of the cover body.

Optionally, the BMS module includes the BMS body and is used for bearing the box body of BMS body, the outer wall of box body is inwards sunken in order to form the portion of dodging, dodge the portion respectively with electric core with the pressure relief portion is linked together and constitutes first pressure release channel.

Optionally, the BMS module comprises a BMS body, a box body for bearing the BMS body, and a waterproof board covered on the box body, at least one air outlet hole is respectively formed in the waterproof board, and the at least one air outlet hole is respectively communicated with the BMS body and the pressure relief portion and forms a second pressure relief channel.

Optionally, the air outlet is configured as an air detection port arranged on the waterproof board, and the air detection port is covered with a waterproof breathable film.

Optionally, the air outlet is configured as an outlet hole arranged on the waterproof board, and a sealant is filled between the outlet hole and a wiring harness passing through the outlet hole.

Optionally, the BMS module includes a BMS body and a box body for carrying the BMS body, a through hole is formed on the box body, and the through hole is respectively communicated with the battery cell and the pressure relief portion and forms a third pressure relief channel.

Optionally, the BMS module comprises a waterproof board covered on the box body, the waterproof board is respectively provided with at least one air outlet, and the through hole is communicated with the air outlet.

According to a second aspect of the present disclosure, there is also provided a vehicle including the power battery described above.

Through above-mentioned technical scheme, the relief pressure portion is casing seal's weak position, can play the pressure release effect, power battery is inside to set up pressure release channel, when power battery internal gas pressure is too big, gaseous accessible pressure release channel and relief pressure portion in time discharge, battery thermal runaway gas can outwards be discharged according to predetermined route, avoid gaseous piling up the emergence explosion in the battery, in addition, need not to set up waterproof ventilated membrane at the casing outside, whole pressure release stable in structure can not receive external impact.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is an exploded view of a power cell provided by an exemplary embodiment of the present disclosure;

fig. 2 is a schematic structural view of a cover and a sealing member of a power battery according to an exemplary embodiment of the present disclosure;

FIG. 3 is an enlarged partial view of the mating of the cover and seal of a power cell provided by an exemplary embodiment of the present disclosure;

FIG. 4 is an exploded view of a power cell provided by an exemplary embodiment of the present disclosure;

fig. 5 is a schematic diagram of a plurality of pressure relief paths of a power battery provided in an exemplary embodiment of the present disclosure.

Description of the reference numerals

1-battery cell, 21-shell main body, 22-cover body, 220-notch, 3-sealing element, 4-BMS module, 41-BMS body, 42-box body, 420-avoiding part, 421-perforation, 43-waterproof plate, 431-gas detection port, 432-wire outlet hole and 5-pressure relief part.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

It should be noted that all actions of acquiring signals, information or data in the present disclosure are performed under the premise of complying with the corresponding data protection regulation policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.

In the present disclosure, where not otherwise stated, the use of directional words such as "upper", "lower", "top" and "bottom" are defined in the context of normal installation of the power cell provided by the present disclosure, and in particular with reference to the orientation of the drawing shown in fig. 1, "inner" and "outer" refer to the inner and outer of the contours of the respective components. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

In the related embodiment of the disclosure, the battery pack of the four-wheel vehicle is large in size, a pressure relief channel is usually arranged, and an explosion-proof valve is arranged on the shell and used for balancing the air pressure inside and outside the battery pack. The battery package of two wheeler is small, can not set up special relief channel usually, can paste the waterproof ventilated membrane of one deck and carry out the pressure release outside the casing, and waterproof ventilated membrane setting receives external impact easily and leads to waterproof ventilated membrane damage in the casing outside, leads to intaking, influences holistic leakproofness.

To solve the above problems, as shown in fig. 1 to 5, the present disclosure provides a power Battery including a Battery cell 1, a case including a case main body 21 for accommodating the Battery cell 1 and a cover 22 for closing a top opening of the case main body 21, and a BMS (Battery Management System) module 4, a sealing member 3 being provided between the case main body 21 and the cover 22; the BMS module 4 is disposed in the housing at a side adjacent to the cover 22; wherein, a pressure relief part 5 is arranged between the sealing member 3 and the case main body 21 and/or between the sealing member 3 and the cover body 22, and the bms module 4 is provided with at least one pressure relief channel communicated with the pressure relief part 5.

Here, the power battery may be a battery pack for a four-wheel vehicle or a battery pack for a two-wheel vehicle. Taking the case where the pressure relief portion 5 is provided between the sealing member 3 and the cover member 22 as an example, the present disclosure includes an embodiment where the pressure relief portion 5 is provided on the mating surface (bottom surface) of the cover member 22, and also includes an embodiment where the pressure relief portion 5 is provided on the mating surface (top surface) of the sealing member 3, and of course also includes an embodiment where the pressure relief portion 5 is provided on both the mating surfaces of the cover member 22 and the sealing member 3. In addition, the number of the pressure relief channels can be designed as required, a plurality of pressure relief channels can share the same pressure relief part 5, and a plurality of pressure relief parts 5 can be arranged to ensure that the pressure relief path is shortest.

Through above-mentioned technical scheme, pressure release portion 5 is the weak position of casing seal, can play the pressure release effect, power battery is inside to set up pressure release channel, when power battery internal gas pressure is too big, gaseous accessible pressure release channel and pressure release portion 5 in time discharge, battery thermal runaway gas can outwards be discharged according to predetermined route, avoid gaseous piling up the emergence explosion in the battery, in addition, need not to set up waterproof ventilated membrane at the casing outside, whole pressure release stable in structure can not receive external impact.

The arrangement of the pressure relief portion 5 may be various. In an exemplary embodiment of the present disclosure, the sealing element 3 may be made of an elastic material, such as a sealing ring, and in a circumferential direction of the sealing element 3, the sealing element 3 has at least two portions with different thicknesses, such as a first portion and a second portion, and the thickness of the first portion is smaller than that of the second portion, wherein a pressure relief portion 5 is formed at a position corresponding to the first portion, and the first portion is thinner and has a smaller compression amount than other sealing positions, so that a sealing weak point is formed, and functions as a pressure relief port. In another embodiment, the relief portion 5 may be formed by designing the material of the sealing member 3, for example, the sealing member 3 may include at least two portions having different materials. Specifically, when the battery is installed, the sealing element 3 is arranged on the top surface of the shell main body 21, the cover body 22 is installed again, the cover body 22 is connected with the shell main body 21 through a plurality of fasteners, when the fasteners are screwed, the sealing element 3 can be compressed, and because the compression amount of the two parts is different, a sealing weak point can be formed, and under a normal state, the sealing and the water proofing are participated, when the air pressure in the battery is too large, the gas can be discharged through the position of the pressure relief part 5, and the position and the number of the sealing weak point can be adjusted and designed according to requirements.

In another exemplary embodiment of the present disclosure, as shown in fig. 2 and 3, the relief portion 5 may be a notch 220 provided on the mating surface (top surface) of the case main body 21 or the mating surface (bottom surface) of the lid body 22. In the above-described embodiment in which the thickness of the sealing member 3 is designed, the sealing member 3 may also be notched due to the difference in thickness. By designing the structures of the case main body 21, the lid body 22, and the sealing member 3, a weak point of sealing is formed, and the reliability of the pressure relief port can be ensured. The shape and size of the gap 220 can be designed as required, and the size of the gap 220 should not be too large to ensure sealing under normal conditions. Specifically, as shown in fig. 2, the notch 220 may be configured as a groove opened on the mating surface of the cover 22, and the groove extends in the wall thickness direction of the cover 22. Thus, gas is exhausted from the side face of the power battery, the pressure relief direction is prevented from going upwards, and direct impact on a user is avoided.

The design of the pressure relief channel can be varied. In an exemplary embodiment of the present disclosure, as shown in fig. 4 and 5, the BMS module 4 includes a BMS body 41 and a case 42 for carrying the BMS body 41, an outer wall of the case 42 is inwardly recessed to form a relief part 420, and the relief part 420 communicates with the battery cell 1 and the pressure relief part 5, respectively, and constitutes a first pressure relief channel. Dodging portion 420 can set up at the middle part of box body 42, and the both sides that box body 42 is relative set up respectively dodging portion 420, can set up two pressure relief portions 5 with dodging the corresponding position department of portion 420 on lid 22, and like this, the gas that electric core 1 produced can be through dodging portion 420 and pressure relief portion 5 outwards discharge, forms first pressure relief route, promptly is electric core 1's pressure relief route, in time discharges the gas that electric core 1 produced.

In another exemplary embodiment of the present disclosure, the BMS module 4 includes the waterproof plate 43 covered on the case 42, the waterproof plate 43 has the same outer contour as the case 42, and particularly, the structure of the waterproof plate 43 does not affect and interfere with the first pressure relief path at a position corresponding to the escape part 420. The waterproof plate 43 is respectively provided with at least one air outlet, and the at least one air outlet is respectively communicated with the BMS body 41 and the pressure relief portion 5 to form a second pressure relief channel. Waterproof board 43 covers establishes on box body 42, seals BMS body 41 in the space of box body 42 and waterproof board 43, and the gas of BMS body 41 combustion gas can discharge to lid 22 and waterproof board 43 in the space through the venthole to outwards discharge by pressure relief portion 5, form the second pressure release route, be the pressure release route of BMS body 41 promptly, in time discharge the gas that BMS body 41 produced.

The air outlet may be designed separately for pressure relief, or an existing hole on the waterproof plate 43 may be used as the air outlet, for example, the air outlet may be configured as an air detection port 431 provided on the waterproof plate 43, and the air detection port 431 is covered with a waterproof and breathable film (not shown in the figure). Waterproof ventilated membrane sets up inside power battery, avoids taking place the damage because of external shock, can also in time discharge the gas in waterproof board 43 and the box body 42 cavity simultaneously. Of course, the air outlet hole may also be configured as a wire outlet hole 432 arranged on the waterproof board 43, and a sealant is filled between the wire outlet hole 432 and a wire harness penetrating through the wire outlet hole 432, in a normal state, no air passes through the wire outlet hole 432, when the internal pressure is too large, the position is fixed by the sealant, and compared with the strength of the shell, the other weak sealing position is formed, the sealant is damaged, the air overflows to play a role of exhausting, and by using the existing hole, the air exhausting function can be realized without additionally arranging a hole. In other embodiments, the positions and the number of the air outlet holes can be designed as required, and the air outlet holes can be closer to the pressure relief portion 5 to shorten the pressure relief path as much as possible.

In another exemplary embodiment of the present disclosure, the case body 42 of the BMS module 4 is formed with a penetration hole 421, and the penetration hole 421 communicates with the battery cell 1 and the pressure relief part 5, respectively, and constitutes a third pressure relief channel. The through hole 421 may be a through hole formed by an FPC (flexible circuit board) and a positive and negative bus bar, the through hole 421 may directly penetrate through the thickness direction of the BMS module 4, and gas generated by the battery cell may be guided into the space between the waterproof plate 43 and the cover 22 through the through hole 421 and discharged by the pressure relief portion 5 to form a third pressure relief path, thereby implementing another pressure relief path of the battery cell 1.

Of course, the through hole 421 may also be designed to guide the gas generated by the battery cell 1 into the cavity between the waterproof board 43 and the box body 42, the through hole 421 is communicated with the air outlet, and the gas generated by the battery cell 1 is discharged sequentially through the through hole 421, the air outlet and the pressure relief portion 5, which all belong to the protection scope of the present disclosure. In addition, in the above-described embodiment, at least three different pressure relief paths are provided, and the present disclosure may include one or more pressure relief paths therein to ensure that the gas generated from the battery cell 1 and the BMS body 41 can be quickly and effectively discharged from the pressure relief part 5.

According to a second aspect of the present disclosure, there is also provided a vehicle comprising the power battery described above. The vehicle has all the advantages of the power battery, and the detailed description is omitted.

The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A power cell, comprising:

an electric core;

a BMS module disposed in the housing at a side close to the cover;

2. The power battery according to claim 1, wherein the sealing member is made of an elastic material, and the sealing member has at least a first portion and a second portion in the circumferential direction of the sealing member, the first portion having a smaller thickness than the second portion, and the relief portion is formed at a position corresponding to the first portion.

3. The power battery according to claim 1, wherein the pressure relief portion is a notch provided on the mating surface of the case main body or the mating surface of the lid body, the notch is configured as a groove opened on the mating surface of the lid body, and the groove extends in a wall thickness direction of the lid body.

4. The power battery according to any one of claims 1-3, wherein the BMS module comprises a BMS body and a box body for bearing the BMS body, the outer wall of the box body is recessed inwards to form an avoiding part, and the avoiding part is respectively communicated with the battery core and the pressure relief part and forms a first pressure relief channel.

5. The power battery according to any one of claims 1-3, wherein the BMS module comprises a BMS body, a box body for bearing the BMS body, and waterproof plates covering the box body, the waterproof plates are respectively provided with at least one air outlet, and the at least one air outlet is respectively communicated with the BMS body and the pressure relief portion and forms a second pressure relief channel.

6. The power battery of claim 5, wherein the air outlet is configured as an air detection port disposed on the waterproof plate, and the air detection port is covered with a waterproof and breathable membrane.

7. The power battery of claim 5, wherein the air outlet hole is configured as an outlet hole provided on the waterproof plate, and a sealant is filled between the outlet hole and a wiring harness passing through the outlet hole.

8. The power battery according to any one of claims 1-3, wherein the BMS module comprises a BMS body and a box body for carrying the BMS body, the box body is provided with through holes, and the through holes are respectively communicated with the battery core and the pressure relief part and form a third pressure relief channel.

9. The power battery according to claim 8, wherein the BMS module includes waterproof plates covering the case, the waterproof plates being respectively provided with at least one air outlet hole, the through holes being in communication with the air outlet holes.

10. A vehicle characterized by comprising the power battery of any one of claims 1-9.