CN220138433U

CN220138433U - Battery module and battery

Info

Publication number: CN220138433U
Application number: CN202321523615.3U
Authority: CN
Inventors: 黄立亮
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-06-15
Filing date: 2023-06-15
Publication date: 2023-12-05
Anticipated expiration: 2033-06-15

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module and a battery. The battery module comprises a plurality of electric cores, an acquisition module and a phase change medium, wherein the electric cores are electrically connected to form an electric core group. The acquisition module is arranged at the upper end of the axial direction of the battery cell group, and a gap is reserved between the acquisition module and the upper end of the axial direction of the battery cell group. At least a portion of the phase change medium fills the gap. The battery comprises the battery module, and the phase change medium absorbs heat transferred from the upper axial end of the battery cell group, so that the cooling effect on the battery cell is improved, and the temperature rise of the battery cell is effectively inhibited. When the battery module is in a low-temperature environment or cold start, the phase change medium transfers the stored heat to each position of the battery cell through the axial end part of the battery cell so as to rapidly heat the battery cell. The phase change medium absorbs and releases heat to the battery core according to different environments of the battery module, so that the battery core is subjected to heat dissipation and heat preservation, and the thermal management efficiency of the battery module is improved.

Description

Battery module and battery

Technical Field

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

Background

When the battery is assembled, the bracket is arranged on the tray, the plurality of battery cells are arranged on the bracket in an array, and the liquid cooling plate is arranged between the circumferential side surfaces of every two rows of battery cells and transfers heat through the heat-conducting structural adhesive. The liquid cooling plate can cool down the battery core with overhigh temperature rise, and can heat the battery core in a cold environment at the same time so as to realize the thermal management of the battery.

According to the temperature measurement experiment of the cylindrical battery cell, the radial heat conduction capacity of the cylindrical battery cell is smaller than the axial heat conduction capacity of the cylindrical battery cell. Namely, the heat dissipation effect of the two axial ends (the upper end and the lower end) of the cylindrical battery cell is better than that of the cylindrical battery cell in the circumferential direction. In the existing battery module, the time required for cooling and heating the cylindrical battery cell by the circumferentially installed liquid cooling plate is longer, so that the temperature rise of the cylindrical battery cell is difficult to be quickly restrained or the cylindrical battery cell is quickly enabled to reach the set temperature, and the thermal management of the battery module is not facilitated.

Disclosure of Invention

The utility model aims to provide a battery module and a battery, which are used for solving the problem of low thermal management efficiency of the battery module in the prior art.

The technical scheme adopted by the utility model is as follows:

a battery module, comprising:

the battery cells are electrically connected to form a battery cell group;

the acquisition module is arranged at the axial upper end of the battery cell group, and a gap is formed between the acquisition module and the axial upper end of the battery cell group;

and the phase change medium is filled in the gap at least partially.

As a preferable scheme, the upper end and the lower end of the acquisition module are both wrapped with the phase change medium to form a temperature control layer.

Preferably, the thickness of the temperature control layer is 2.5 mm-5 mm.

Preferably, the acquisition module includes:

the support plate is arranged at the axial upper end of the battery cell group, and the gap is formed between the support plate and the axial upper end of the battery cell group;

the bus bars are arranged on the supporting plate, and the plurality of battery cores are electrically connected through the bus bars.

As a preferable scheme, the support plate is provided with a glue leakage hole in a penetrating mode along the thickness direction of the support plate, and the glue leakage hole is communicated with the gap.

Preferably, a plurality of glue leakage holes are uniformly distributed on the supporting plate.

As the preferred scheme, battery module still includes tray and support, a plurality of the electric core is the array and installs on the support, the support install in the tray, the electric core the support with the tray is connected as an organic wholely.

As a preferred scheme, the battery module further comprises a liquid cooling system, the liquid cooling system is provided with a plurality of liquid cooling plates, and one liquid cooling plate is arranged between the circumferential side surfaces of each two rows of the battery cells.

Preferably, the battery module further comprises an insulating film, and the insulating film is covered above the collecting module.

The battery comprises the battery module.

The beneficial effects of the utility model are as follows:

according to the battery module provided by the utility model, as the heat conduction capacity of the axial end part of the battery cell is better, when the phase-change medium is filled in the gap between the acquisition module and the axial upper end of the battery cell group, the phase-change medium absorbs the heat transferred by the axial upper end of the battery cell group, so that the cooling effect on the battery cell is improved, and the temperature rise of the battery cell is effectively inhibited. When the battery module is in a low-temperature environment or cold start, the phase change medium transfers the stored heat to each position of the battery cell through the axial end part of the battery cell so as to rapidly heat the battery cell. The phase change medium absorbs and releases heat to the battery core according to different environments of the battery module, so that the battery core is subjected to heat dissipation and heat preservation, and the thermal management efficiency of the battery module is improved.

In addition, when the battery module is out of control, the phase change medium can absorb the heat that the electric core produced through electric core axial tip fast to reduce the temperature rise of electric core that takes place out of control fast, avoid causing the damage to other electric cores, improved battery module's security.

The battery provided by the utility model comprises the battery module, and the phase change medium absorbs and releases heat to the battery core according to different environments of the battery module so as to play roles in heat dissipation and heat preservation to the battery core, thereby improving the thermal management efficiency of the battery module.

Drawings

Fig. 1 is a partially exploded view of a battery module according to an embodiment of the present utility model.

The parts in the figures are named and numbered as follows:

1. an acquisition module; 11. a support plate; 2. a phase change medium; 3. a battery cell; 4. an insulating film; 5. a liquid cooling plate; 6. and a tray.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1, the present embodiment provides a battery, which includes a battery module, the battery module includes a tray 6, a support and a plurality of electric cells 3, the plurality of electric cells 3 are arranged on the support in an array, and the plurality of electric cells 3 are electrically connected to form an electric cell group. The bracket is arranged in the tray 6, and the battery cell 3 and the bracket are connected with the tray 6 into a whole. It should be noted that, the battery cell 3 in this embodiment is a cylindrical battery cell. In other embodiments, the battery cell 3 may be a square aluminum case battery cell or the like, which is not particularly limited herein.

Specifically, the upper end in the axial direction of the battery cell 3 is provided with a positive pole post, and the lower end in the axial direction of the battery cell 3 is a negative pole and is provided with a pressure relief valve. A plurality of first pressure relief holes which are opposite to the pressure relief valves of each battery cell 3 are formed in the support, a plurality of second pressure relief holes are formed in the tray 6, and the number of the first pressure relief holes is the same as that of the second pressure relief holes and the first pressure relief holes are opposite to each other one by one. When the battery cell 3 is assembled, glue is filled in the tray 6 so as to bond and connect the battery cell 3, the bracket and the tray 6, so that the battery cell 3, the bracket and the tray 6 form a stable integral structure, and the assembly operation is convenient. Meanwhile, heat conduction structural adhesive is filled between the plurality of battery cells 3, so that the battery cell groups are adhered into a whole through the heat conduction structural adhesive. In addition, each battery cell 3 can conduct heat through the heat conducting structural adhesive, so that the heat dissipation efficiency of the battery cell 3 is improved.

Further, the battery module further comprises a liquid cooling system, the liquid cooling system is provided with a plurality of liquid cooling plates 5, and one liquid cooling plate 5 is arranged between the circumferential side surfaces of each two rows of battery cells 3. The cooling medium (typically water) in the liquid cooling plate 5 exchanges heat with the circumferential side surface of the battery cell 3 to cool or heat the battery cell 3. The liquid cooling system further comprises a pipeline, a cold source and other structures, the cold source cools or heats the cooling medium according to the environment where the battery module is located, so that the cooling or heating function of the battery cell 3 is achieved, the plurality of liquid cooling plates 5 are connected in series after being connected in parallel through the pipeline, and the liquid cooling plates can be communicated with the cold source through the pipeline, so that the circulating cooling and circulating heating functions of the liquid cooling system are achieved. Because the liquid cooling system is the prior art, the specific structure and the working principle of the liquid cooling system are not repeated.

As shown in fig. 1, the battery module of this embodiment further includes an acquisition module 1, where the acquisition module 1 is disposed at an axial upper end of the battery cell group, and a gap is formed between the acquisition module 1 and the axial upper end of the battery cell group. Specifically, the collection module 1 includes a support plate 11 and a busbar, the support plate 11 is disposed at an axial upper end of the battery cell group, and a gap is formed between the support plate 11 and the axial upper end of the battery cell group. The bus bars are disposed on the support plate 11, and the plurality of battery cells 3 are electrically connected through the bus bars. Specifically, the bus bar is connected with the poles of the battery cell 3 by welding.

It should be noted that, the collection module 1 further includes an FRC flexible board, a collection sheet, and the like, and the FPC flexible board is welded with the corresponding bus bar through the collection sheet, so as to collect parameters such as temperature and pressure of each electric core 3.

Further, the battery module further comprises an insulating film 4, and the insulating film 4 is covered above the acquisition module 1 to realize insulating installation of the acquisition module 1 and the shell of the battery and other structures, avoid short circuit of the acquisition module 1 and improve the safety of the battery module.

According to the temperature measurement experiment of the cylindrical battery cell, the radial heat conduction capacity of the cylindrical battery cell is smaller than the axial heat conduction capacity of the cylindrical battery cell. Namely, the heat dissipation effect of the two axial ends (the upper end and the lower end) of the cylindrical battery cell is better than that of the cylindrical battery cell in the circumferential direction. The liquid cooling plate 5 circumferentially installed in the existing battery module has longer time for cooling and heating the cylindrical battery cell, so that the temperature rise of the cylindrical battery cell is difficult to be quickly restrained or the cylindrical battery cell is quickly enabled to reach the set temperature, and the thermal management of the battery module is not facilitated.

In order to solve the above problems, as shown in fig. 1, the battery module further includes a phase change medium 2, at least a portion of the phase change medium 2 being filled in the gap. Because the heat conduction capability of the axial end part of the battery cell 3 is better, the phase change medium 2 absorbs heat transferred by the axial upper end of the battery cell group, the cooling effect on the battery cell 3 is improved, and the temperature rise of the battery cell 3 is effectively inhibited. When the battery module is in a low-temperature environment or cold start, the phase change medium 2 transfers the stored heat to various positions of the battery cell 3 through the axial end of the battery cell 3 so as to rapidly heat the battery cell 3. The phase change medium 2 absorbs and releases heat to the battery core 3 according to different environments of the battery module, so as to play roles in heat dissipation and heat preservation to the battery core 3, and the thermal management efficiency of the battery module is improved.

In addition, when the battery module takes place thermal runaway, the phase change medium 2 can absorb the heat that the electric core 3 produced through electric core 3 axial tip fast to reduce the temperature rise of electric core 3 that takes place thermal runaway fast, avoid causing the damage to other electric cores 3, improved the security of battery module.

It should be noted that, the battery further includes a bottom guard board, and when the battery is assembled, the tray 6 is located on the bottom guard board of the battery, so as to protect the battery module. The phase change medium 2 can quickly inhibit the temperature rise of the battery cell 3 which is out of control, so that the temperature of high-temperature and high-pressure gas sprayed from the pressure release valve at the lower end of the battery cell 3 is reduced, the bottom guard plate below the tray 6 is prevented from being damaged, and the safety of a battery is protected.

Specifically, the upper end and the lower end of the acquisition module 1 are both wrapped with the phase change medium 2 to form a temperature control layer. The temperature control layer absorbs heat or dissipates heat to the battery cell 3 according to different states (states of charge and discharge, thermal runaway and the like) of the battery cell 3, so that the phase change medium 2 and the liquid cooling system jointly realize thermal management to the battery cell 3, the thermal management efficiency is further improved, and safe and stable operation of the battery is realized.

Further, since the phase change medium 2 is wrapped at the upper end of the collecting module 1, that is, the phase change medium 2 is covered on the bus bar on the supporting plate 11, the bus bar and the welding seam of the battery cell 3 are prevented from being oxidized. Moreover, the phase change medium 2 can also avoid oxidation of the acquisition sheet, the welding seam of the acquisition sheet and the bus bar, and the safety and the reliability of the acquisition module 1 are improved.

Specifically, the support plate 11 is provided with a glue leakage hole (not shown) penetrating through the support plate in the thickness direction thereof, and the glue leakage hole communicates with the gap. When the phase-change medium 2 is poured into the upper end surface of the support plate 11, part of the phase-change medium 2 is arranged on the upper end surface of the support plate 11 to form a temperature control layer above the support plate 11, and the other part of the phase-change medium 2 flows into a gap below the support plate 11 through the glue leakage hole to form a temperature control layer below the support plate 11, so that the upper end and the lower end of the acquisition module 1 are both wrapped with the phase-change medium 2.

Further, a plurality of glue leakage holes are uniformly distributed on the supporting plate 11, so that part of the phase change medium 2 on the upper end surface of the supporting plate 11 is rapidly and uniformly filled into the gap through the glue leakage holes, the defects of bubbles and the like in the temperature control layer below the supporting plate 11 are avoided, and the filling efficiency and the filling quality are improved.

In this embodiment, the thickness of the temperature control layer is 2.5mm to 5mm, for example, the thickness of the temperature control layer may be 2.5mm, 3mm, 4mm, 5mm, or the like. The use amount of the phase-change medium 2 is adjusted by adjusting the thickness of the temperature control layer, so that the phase-change medium 2 is guaranteed to have enough heat absorption and heat release functions to meet the thermal management requirement of the battery module, the cost of the phase-change medium 2 is controlled, and the excessively thick temperature control layer is prevented from increasing the height and the volume of the battery module.

The battery of this embodiment includes foretell battery module, and phase change medium 2 realizes the heat absorption and the heat release to electric core 3 according to the different environment that battery module was located to play heat dissipation and heat preservation effect to electric core 3, improved battery module's thermal management efficiency.

The above embodiments merely illustrate the basic principle and features of the present utility model, and the present utility model is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The battery module, its characterized in that includes:

the battery cells (3) are electrically connected to form a battery cell group;

the acquisition module (1) is arranged at the axial upper end of the battery cell group, and a gap is formed between the acquisition module (1) and the axial upper end of the battery cell group;

and a phase change medium (2), wherein at least part of the phase change medium (2) is filled in the gap.

2. The battery module according to claim 1, wherein the phase change medium (2) is wrapped at both the upper and lower ends of the acquisition module (1) to form a temperature control layer.

3. The battery module according to claim 2, wherein the thickness of the temperature control layer is 2.5mm to 5mm.

4. The battery module according to claim 1, wherein the acquisition module (1) comprises:

the support plate (11) is arranged at the upper end of the axial direction of the battery cell group, and the gap is formed between the support plate (11) and the upper end of the axial direction of the battery cell group;

and the bus bars are arranged on the supporting plate (11), and the plurality of the battery cells (3) are electrically connected through the bus bars.

5. The battery module according to claim 4, wherein the support plate (11) is provided with a glue leakage hole penetrating through in a thickness direction thereof, the glue leakage hole being communicated with the gap.

6. The battery module according to claim 5, wherein the support plate (11) is uniformly provided with a plurality of the glue leakage holes.

7. The battery module according to claim 1, further comprising a tray (6) and a bracket, wherein a plurality of the cells (3) are arranged on the bracket in an array, the bracket is arranged in the tray (6), and the cells (3), the bracket and the tray (6) are integrally connected.

8. The battery module according to claim 7, further comprising a liquid cooling system having a plurality of liquid cooling plates (5), one of the liquid cooling plates (5) being provided between circumferential sides of each two rows of the cells (3).

9. The battery module according to any one of claims 1 to 8, further comprising an insulating film (4), wherein the insulating film (4) is covered over the collecting module (1).

10. A battery comprising the battery module according to any one of claims 1 to 9.