CN218472175U

CN218472175U - Battery pack and vehicle

Info

Publication number: CN218472175U
Application number: CN202222704556.1U
Authority: CN
Inventors: 周倩楠; 林文生; 刘国雄; 王高武
Original assignee: Wuwei Fudi Battery Co ltd; BYD Co Ltd
Current assignee: Wuwei Fudi Battery Co ltd; BYD Co Ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2023-02-10
Anticipated expiration: 2032-10-13

Abstract

The present disclosure relates to a battery pack and a vehicle, the battery pack has at least two voltage segment regions (100), and the battery pack comprises a tray (1) and battery cells (2), the tray (1) has a carrying surface (11) for carrying the battery cells (2) at each voltage segment region (100), the battery cells (2) on two adjacent carrying surfaces (11) are connected in series, at least two carrying surfaces (11) comprise a first carrying surface (111) and a second carrying surface (112) which are adjacent, wherein the first carrying surface (111) and the second carrying surface (112) are arranged in a staggered manner in the vertical direction. The battery pack can reduce the probability of arcing and firing.

Description

Battery pack and vehicle

Technical Field

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

Background

At present, batteries are widely applied in various aspects of life, and with the development of battery technology, the application scenes of the batteries are gradually changed to the fields of automobiles, base stations, energy storage power stations and the like by small-power electronic products such as mobile phones, household appliances and the like.

In the related art, for a battery pack having a plurality of cells connected in series, the battery pack has advantages of high voltage and high power. However, such battery packs also present certain safety risks. Specifically, when a liquid flows in the battery pack, for example, when an electrolyte leaks from the battery pack or the liquid enters the battery pack, corrosion of the liquid and conduction of the liquid occur. In the existing battery pack, because liquid can flow in the battery pack at random, when the liquid flows into a high-voltage position in the battery pack, a battery core is short-circuited and high-voltage breakdown occurs, and further serious safety accidents such as arcing and ignition are caused.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide a battery pack capable of reducing the probability of arcing and firing itself.

In order to achieve the above object, the present disclosure provides a battery pack, which has at least two voltage segment regions, and includes a tray and cells, where the tray has a carrying surface for carrying the cells at each voltage segment region, the cells on two adjacent carrying surfaces are connected in series, and at least two adjacent carrying surfaces include a first carrying surface and a second carrying surface, where the first carrying surface and the second carrying surface are staggered in an up-down direction.

Optionally, the number of the voltage segment regions is three, and the number of the bearing surfaces is three and includes two first bearing surfaces, where the first bearing surfaces are lower than the second bearing surfaces, and a second bearing surface is disposed between the two first bearing surfaces.

Optionally, the number of the voltage segment regions is three, and the number of the bearing surfaces is three and includes two first bearing surfaces, where the first bearing surfaces are higher than the second bearing surfaces, and a second bearing surface is disposed between the two first bearing surfaces.

Optionally, the voltage segment regions are multiple in number, and the multiple bearing surfaces include first bearing surfaces and second bearing surfaces that are sequentially arranged in a staggered manner along the first direction.

Optionally, the first direction is a length direction of the tray.

Optionally, the length of the tray is 200 mm-1900 mm.

Optionally, the height difference between adjacent first bearing surfaces and second bearing surfaces is no more than 6mm.

Optionally, the battery pack includes a cover plate disposed above the tray, the battery core is disposed between the tray and the cover plate, the first carrying surface is disposed lower than the second carrying surfaces, and a groove for avoiding the battery core is disposed above each second carrying surface of the cover plate.

Optionally, a plurality of the battery cells are sequentially connected in series along a first direction, and the plurality of the battery cells are configured as a single-layer battery cell structure.

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

Through the technical scheme, in the battery pack provided by the disclosure, the battery cells of the battery pack are respectively arranged in each voltage segmentation area, wherein each carrying surface of the tray is used for carrying the battery cells, and when the battery cells on the first carrying surface leak electrolyte or the corresponding voltage segmentation areas enter liquid, the first carrying surface and the second carrying surface are arranged in a staggered manner in the vertical direction, so that when the first carrying surface is higher than the second carrying surface, the liquid can flow downwards into the adjacent second carrying surface, and the short circuit of the battery cells on the first carrying surface can be prevented and only can occur to the battery cells on the lower second carrying surface; when the first bearing surface is lower than the second bearing surface, the liquid cannot flow upwards into the adjacent second bearing surface due to the action of gravity, that is, the short circuit only occurs in the battery cell located on the lower first bearing surface. Therefore, according to the battery pack, the first bearing surface and the second bearing surface are arranged in a vertically staggered manner, so that the short circuit of the battery cell in the battery pack is controlled to the battery cell on the lower bearing surface, namely, the arrangement can block the random flow of liquid, and compared with the situation that the battery cell on the first bearing surface and the battery cell on the second bearing surface are short-circuited at the same time, the short-circuit voltage is lower, so that the probability of arcing and firing caused by self can be reduced.

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 a schematic structural view of a battery pack provided according to an embodiment of the present disclosure;

fig. 2 is a schematic view of a partial structure of a battery pack provided according to an embodiment of the present disclosure, in which a tray and a cover plate are shown.

Description of the reference numerals

1-tray, 11-bearing surface, 111-first bearing surface, 112-second bearing surface, 2-battery core, 3-cover plate, 31-groove and 100-voltage segmentation area.

Detailed Description

The following detailed description of the embodiments of the disclosure refers to 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.

In the present disclosure, in the case where no description is made to the contrary, the use of the directional words such as "up and down" is defined based on fig. 1, specifically, with reference to the drawing direction of fig. 1, and in addition, the up and down direction may also be referred to the gravity direction of the battery pack. The terms "first" and "second" are used herein to distinguish one element from another, and are not necessarily sequential or significant. Moreover, in the following description, when referring to the drawings, the same reference numbers in different drawings designate the same or similar elements, and detailed description thereof is omitted.

According to a specific embodiment of the present disclosure, a battery pack is provided, which is illustrated in fig. 1 and fig. 2, and includes a tray 1 and battery cells 2, wherein the tray 1 has a carrying surface 11 for carrying the battery cells 2 in each voltage segment area 100, the battery cells 2 on two adjacent carrying surfaces 11 are connected in series, and the at least two carrying surfaces 11 include a first carrying surface 111 and a second carrying surface 112 which are adjacent, and the first carrying surface 111 and the second carrying surface 112 are arranged in a staggered manner in an up-and-down direction.

Through the above technical solution, in the battery pack provided by the present disclosure, the battery cells 2 of the battery pack are respectively arranged in each voltage segment area 100, wherein each carrying surface 11 of the tray 1 is used for carrying the battery cell 2, and here, when, for example, an electrolyte leakage occurs in the battery cell 2 on the first carrying surface 111 or a liquid enters the corresponding voltage segment area 100, the first carrying surface 111 and the second carrying surface 112 are arranged in a staggered manner in the vertical direction, so that when the first carrying surface 111 is higher than the second carrying surface 112, the liquid can flow downward into the adjacent second carrying surface 112, and thus the short circuit of the battery cell 2 on the first carrying surface 111 can be prevented, and the short circuit can only occur in the battery cell 2 on the lower second carrying surface 112; when the first carrying surface 111 is lower than the second carrying surface 112, the liquid will not flow upward into the adjacent second carrying surface 112 due to the action of gravity, that is, the short circuit will only occur in the battery cells 2 on the lower first carrying surface 111. Therefore, the first bearing surface 111 and the second bearing surface 112 are arranged in a staggered manner in the vertical direction, so that the short circuit of the battery cells 2 in the battery pack is controlled to be the battery cells on the lower bearing surface 11, that is, the arrangement can prevent the liquid from flowing randomly, and compared with the case that the battery cells 2 on the first bearing surface 111 and the battery cells 2 on the second bearing surface 112 are short-circuited at the same time, the short-circuit voltage is lower, and therefore, the battery pack of the present disclosure can reduce the probability of arcing and firing.

It should be noted that, in the present disclosure, the battery cells 2 on the two adjacent carrying surfaces 11 are connected in series, so that, compared with the battery cells 2 on the two carrying surfaces 11 being short-circuited at the same time, the voltage of the short circuit of the battery cell on one carrying surface 11 is relatively low, and such an arrangement can prevent the battery pack from high-voltage breakdown, and thus, can reduce the probability of arcing and firing of the battery pack. In addition, the short circuit phenomenon of the battery pack in the present disclosure may also be controlled to the battery cells 2 within the single voltage segmentation area 100, i.e., the safety performance of the battery pack is also improved. In addition, at least one battery cell 2 may be disposed on the first carrying surface 111, and correspondingly, at least one battery cell 2 may also be disposed on the second carrying surface 112, which is not limited in this disclosure.

It should be further noted that when electrolyte leaks from the battery cell 2 on the lower carrying surface 11 or liquid enters the corresponding voltage segmentation area 100, since an insulation structure is generally disposed on the battery cell 2, when the insulation structure breaks down or fails, the battery cell 2 is short-circuited.

In the embodiment of the present disclosure, referring to fig. 1 and 2, the number of the voltage segment regions 100 is three, the number of the carrying surfaces 11 is three and includes two first carrying surfaces 111, wherein the first carrying surfaces 111 may be disposed lower than the second carrying surfaces 112, and the second carrying surfaces 112 are disposed between the two first carrying surfaces 111. Like this, when electrolyte leakage or its voltage segmentation region 100 that corresponds appeared liquid admission phenomenon in the electricity core 2 on second loading face 112, liquid can shunt to the lower first loading face 111 in both sides, like this, can prevent that electricity core 2 on second loading face 112 from taking place the short circuit, and the short circuit only can take place the electricity core 2 on single first loading face 111, consequently, can further reduce the battery package and take place to draw the probability of arc and strike fire.

In the embodiment of the present disclosure, the number of the voltage segment regions 100 is three, the number of the carrying surfaces 11 is three and includes two first carrying surfaces 111, wherein the first carrying surfaces 111 may be disposed higher than the second carrying surfaces 112, and the second carrying surfaces 112 are disposed between the two first carrying surfaces 111. In this way, when the electrolyte leaks from the battery cells 2 on the second bearing surface 112 or the liquid enters the corresponding voltage segment area 100, the liquid cannot flow upwards into the first bearing surfaces 111 with the two higher sides, and thus, a short circuit occurs only in the battery cells 2 on the single second bearing surface 112, and therefore, the probability of arcing and firing of the battery pack can be further reduced.

In the embodiment of the present disclosure, referring to fig. 1 and 2, the number of the voltage segment regions 100 is plural, and the plurality of carrying surfaces 11 includes a first carrying surface 111 and a second carrying surface 112 which are sequentially staggered in the first direction. Here, the plurality of meanings means four or more, and therefore, the tray 1 of the present disclosure includes at least two first bearing surfaces 111 and two second bearing surfaces 112, and accordingly, the battery cells 2 in the battery pack may be further segmented, that is, the short-circuit voltage occurring in each voltage segmentation area 100 is low, and therefore, the probability of arcing and firing of the battery pack may be further reduced.

In some embodiments of the present disclosure, as shown in fig. 1 and 2, the first direction may be a length direction of the tray 1 (refer to a left-right direction of the drawing of fig. 1 and 2). Thus, the battery cells 2 can be arranged along the length direction of the tray 1, and the arrangement space of the tray 1 is fully utilized.

In some embodiments of the present disclosure, the tray 1 may have a length of 200mm to 1900mm. For example 250mm or 1850mm, so that the length of the tray 1 can be flexibly designed.

In some embodiments of the present disclosure, the height difference between adjacent first and second bearing

surfaces

111, 112 is no more than 6mm. For example, the height difference may be 5mm. Here, by limiting the height difference between the first bearing surface 111 and the second bearing surface 112, it is possible to prevent the height difference from being too large, and when the height difference is too large, on one hand, the structural strength of the tray 1 may be affected, and on the other hand, the difficulty in series connection of the adjacent battery cells 2 may be increased, here, the connection of the adjacent battery cells 2 generally employs a connection sheet, and the too large height difference may easily cause the connection sheet to be unable to connect the battery cells 2 in series.

In some embodiments of the present disclosure, referring to fig. 1 and 2, the battery pack includes a cover plate 3 disposed above the tray 1, the battery cells 2 are disposed between the tray 1 and the cover plate 3, wherein the first carrying surface 111 is disposed lower than the second carrying surfaces 112, and the cover plate 3 is opened with a groove 31 for avoiding the battery cells 2 above each of the second carrying surfaces 112. Here, the groove 31 can be provided to avoid the corresponding position cell 2, so as to prevent the two from interfering.

In some embodiments of the present disclosure, the plurality of battery cells 2 may be sequentially connected in series along the first direction, and the plurality of battery cells 2 may be configured as a single-layer cell structure. Here, the single-cell structure means that the cells 2 in the battery pack are arranged only in one layer in the up-down direction, so that the cells 2 in each voltage segment region 100 can be prevented from being stacked in the up-down direction.

According to a second aspect of the present disclosure, there is provided a vehicle including the battery pack as described above, which has all the advantages of the battery pack as described above, and the details of the present disclosure are not repeated herein. In some embodiments of the present disclosure, the vehicle may be an electric vehicle, i.e., a vehicle that runs by driving itself with electric power provided by a battery pack.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of 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 above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations will not be further described in the present disclosure.

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 battery pack, wherein the battery pack has at least two voltage segmentation regions, and the battery pack comprises a tray and cells, the tray has a carrying surface for carrying the cells in each voltage segmentation region, the cells on two adjacent carrying surfaces are connected in series, and the at least two carrying surfaces comprise a first carrying surface and a second carrying surface which are adjacent, wherein the first carrying surface and the second carrying surface are staggered in the up-down direction.

2. The battery pack according to claim 1, wherein the number of the voltage segment regions is three, the number of the bearing surfaces is three and includes two first bearing surfaces, wherein the first bearing surfaces are disposed lower than the second bearing surfaces, and a second bearing surface is disposed between the two first bearing surfaces.

3. The battery pack according to claim 1, wherein the number of the voltage segment regions is three, the number of the bearing surfaces is three and includes two first bearing surfaces, wherein the first bearing surfaces are disposed higher than the second bearing surfaces, and a second bearing surface is disposed between the two first bearing surfaces.

4. The battery pack according to claim 1, wherein the voltage segment regions are plural in number, and the plural bearing surfaces include first bearing surfaces and second bearing surfaces that are sequentially staggered in the first direction.

5. The battery pack of claim 4, wherein the first direction is a length direction of the tray.

6. The battery pack according to claim 5, wherein the tray has a length of 200mm to 1900mm.

7. The battery pack according to claim 4, wherein the height difference between the adjacent first and second supporting surfaces is not more than 6mm.

8. The battery pack of claim 4, comprising a cover plate disposed over the tray, the cells being disposed between the tray and the cover plate, wherein the first load-bearing surface is disposed lower than the second load-bearing surfaces, and the cover plate defines a recess above each of the second load-bearing surfaces for avoiding the cells.

9. The battery pack of claim 8, wherein the plurality of cells are sequentially connected in series along a first direction, and the plurality of cells are configured as a single-layer cell structure.

10. A vehicle characterized by comprising the battery pack according to any one of claims 1 to 9.