CN220934228U

CN220934228U - Battery pack

Info

Publication number: CN220934228U
Application number: CN202322330588.4U
Authority: CN
Inventors: 曾士哲
Original assignee: Weilai Battery Technology Anhui Co ltd
Current assignee: Weilai Battery Technology Anhui Co ltd
Priority date: 2023-08-28
Filing date: 2023-08-28
Publication date: 2024-05-10
Anticipated expiration: 2033-08-28

Abstract

The utility model relates to the technical field of battery packs, and particularly provides a battery pack. In order to solve the problem of uneven temperature of the internal battery core of the existing battery pack, the battery pack comprises a battery module and a temperature equalizing plate, wherein the battery module comprises a plurality of stacked battery cores, and the temperature equalizing plate is in heat transfer contact with the battery module; the temperature equalization plate comprises a metal layer and a graphene layer, and the graphene layer is attached to the metal layer. The metal layer of samming board is as the attached structural substrate of graphene layer, provides good thermal conductivity and structural strength, and the graphene layer is a material that has high thermal conductivity, and this material's thermal conductivity is more than 1500w/mk, and it can provide higher thermal conductivity in less thickness, in the battery package, and the graphene layer can more effectively transmit and homogenize heat to make samming board can absorb fast and disperse the heat that the battery module produced, thereby the equilibrium of temperature in the effective control battery package makes the whole difference in temperature of package less when long-time low temperature is stood.

Description

Battery pack

Technical Field

The utility model relates to the technical field of battery packs, and particularly provides a battery pack.

Background

The battery pack is used as an important structure of the electric automobile, the service life and the charge and discharge capacity of the battery core are one of important judging factors of the performance of the electric automobile, when the battery pack in the related art is operated, the battery core is in a nonuniform temperature state, the service life of the battery core is attenuated and the charge and discharge capacity of the battery core is damaged due to the temperature difference of different positions, the temperature of each position is balanced by arranging the temperature equalizing plates between the battery cores in the prior art, and the problem that the battery core still has nonuniform temperature due to the poor performance of the conventional temperature equalizing plates is solved.

Accordingly, there is a need in the art for a new battery pack that solves the problem of temperature non-uniformity in the cells within the existing battery pack.

Disclosure of utility model

The utility model aims to solve the technical problems, namely the problem of uneven temperature of the battery core in the conventional battery pack.

In a first aspect, the present utility model provides a battery pack, the battery pack comprising a plurality of stacked cells; the temperature equalization plate is in heat transfer contact with the battery module;

the temperature equalization plate comprises a metal layer and a graphene layer, and the graphene layer is attached to the metal layer.

In the above-mentioned alternative technical solution of the battery pack, the temperature equalization plate and the battery module are bonded through a heat conductive adhesive layer.

In the above-mentioned alternative technical solution of the battery pack, the graphene layer is adhered to the metal layer by a heat-conducting adhesive; or the graphene layer is sprayed on the metal layer.

In an optional technical scheme of the battery pack, the battery module comprises a first battery module and a second battery module which are arranged side by side along a first direction, the first battery module is close to an edge beam of the battery pack, and the second battery module is arranged on one side, away from the edge beam, of the first battery module; the temperature equalization plate is in heat transfer contact with the first battery module and the second battery module.

In an optional technical scheme of the battery pack, the temperature equalization plate comprises a first plate, a connecting plate and a second plate which are sequentially connected, wherein the first plate and the second plate extend along a second direction, and the second direction is perpendicular to the first direction;

The first plate is in heat transfer contact with the first battery module and the second plate is in heat transfer contact with the second battery module.

In an alternative aspect of the above battery pack, the first plate is in heat transfer contact with a side of the first battery module adjacent to the side rail.

In the above-mentioned alternative technical solution of the battery pack, in the second direction, the lengths of the first battery module and the second battery module are L, the length of the first plate is L1, and the length of the second plate is L2, so that L1/L is 1/5-1; L2/L is 1/5-1.

In an alternative technical scheme of the battery pack, the battery pack comprises two temperature equalizing plates which are symmetrically arranged, and the two temperature equalizing plates are in heat transfer contact with the first battery module and the second battery module; the L1/L is 1/5-2/5; L2/L is 1/5-1/2.

In the above-mentioned alternative technical scheme of the battery pack, a heating body is further disposed on the temperature equalization plate.

In an alternative solution of the above battery pack, the heating body is disposed on the connection plate.

As will be appreciated by those skilled in the art, the battery pack of the present utility model comprises a battery module comprising a plurality of stacked cells and a temperature equalization plate in heat transfer contact with the battery module; the temperature equalization plate comprises a metal layer and a graphene layer, and the graphene layer is attached to the metal layer.

Under the condition of adopting the technical scheme, the metal layer of the temperature equalizing plate is used as a structural substrate to which the graphene layer is attached, good thermal conductivity and structural strength are provided, the graphene layer is a material with high thermal conductivity, the thermal conductivity of the material is up to more than 1500w/mk, the material can provide higher thermal conductivity in smaller thickness, and the graphene layer can transfer and homogenize heat more effectively in the battery pack, so that the temperature equalizing plate can quickly absorb and disperse heat generated by an electric core in the battery module, the temperature balance in the battery pack is effectively controlled, and the whole pack is smaller when the temperature difference is kept stand at low temperature for a long time.

Drawings

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings, in which:

fig. 1 is a sectional view of a battery pack of the present utility model;

FIG. 2 is a cross-sectional view of a second plate of the temperature equalization plate of the present utility model;

Fig. 3 is a cross-sectional view of a connection plate of the temperature equalization plate of the present utility model.

List of reference numerals:

1. A temperature equalizing plate; 11. a metal layer; 12. a graphene layer; 13. a heat conducting adhesive layer; 14. a first plate; 15. a second plate; 16. a connecting plate; 17. a heating body; 2. a battery module; 21. a first battery module; 22. a second battery module; 23. and a third battery module.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model. Those skilled in the art can adapt it as desired to suit a particular application. For example, although the battery pack of the present utility model is described in connection with an electric vehicle, the application object of the battery pack is not limited, and the power consumption device may be an electric vehicle, a hybrid electric vehicle, a fuel automobile or the like, a flying device such as a robot, an unmanned aerial vehicle or the like, or an electronic product such as a computer, a mobile phone, an electronic watch or the like, and the power consumption device may be selected by those skilled in the art according to the need.

It should be noted that, in the description of the present utility model, terms such as "center," "upper," "lower," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the term "connected" should be interpreted broadly, and for example, may be a fixed connection, a removable connection, or a unitary connection; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Referring to fig. 1 and 2, in order to solve the problem of temperature non-uniformity of cells in an existing battery pack, the battery pack of the utility model comprises a temperature equalization plate 1 and a battery module 2, the battery module 2 comprises a plurality of stacked cells, the temperature equalization plate 1 is in heat transfer contact with the battery module 2, the temperature equalization plate 1 comprises a metal layer 11 and a graphene layer 12, and the graphene layer 12 is attached to the metal layer 11.

The above arrangement has the advantages that: the metal layer 11 of the temperature equalizing plate 1 is used as a structural substrate to which the graphene layer 12 is attached, good thermal conductivity and structural strength are provided, the graphene layer 12 is a material with high thermal conductivity, the thermal conductivity of the material is up to more than 1500w/mk, the material can provide higher thermal conductivity in smaller thickness, and the graphene layer 12 can transfer and homogenize heat more effectively in a battery pack, so that the temperature equalizing plate 1 can quickly absorb and disperse heat generated by an electric core in a battery module, the temperature balance in the battery pack is effectively controlled, and the temperature difference of the whole battery pack is smaller when the battery pack is kept at low temperature for a long time.

With continued reference to fig. 1 and 2, in one possible embodiment, the temperature equalization plate 1 further includes a thermal conductive adhesive layer 13, the temperature equalization plate 1 is adhered to the battery module 2 through the thermal conductive adhesive layer 13, the graphene layer 12 is adhered to the metal layer 11 through the thermal conductive adhesive, or the graphene layer 12 is sprayed on the metal layer 11, and the adhesion manner between the graphene layer 12 and the metal layer 11 is not limited, so that the person skilled in the art can set the adhesion manner according to the needs. Further, a heating body 17 for locally loading a small area of heat source is also provided on the temperature equalizing plate 1.

Specifically, the battery module 2 includes a first battery module 21, a second battery module 22 and a third battery module 23 arranged side by side along a first direction, the first battery module 21 and the third battery module 23 are respectively close to side rails on the left and right sides of the battery pack, the second battery module 22 is arranged on one side of the first battery module 21 away from the side rails and between the first battery module 21 and the third battery module 23, one temperature equalizing plate 1 is in heat transfer contact with the first battery module 21 and the second battery module 22, and the other temperature equalizing plate 1 is in heat transfer contact with the third battery module 23 and the second battery module 22. Further, the temperature equalizing plate 1 includes a first plate 14, a connecting plate 16, and a second plate 15 connected in this order, the first plate 14 and the second plate 15 extending in a second direction, the second direction being perpendicular to the first direction. Optionally, the third plate 16 extends in the first direction so that the cross section of the temperature equalization plate 1 has a U-like structure. Further, referring to fig. 2, the first plate 14 and the second plate 15 each include a metal layer 11, a graphene layer 12 and a thermal conductive adhesive layer 13, and referring to fig. 3, the connection plate 16 includes a metal layer 11, a graphene layer 12 and a heating body 17, and the heating body 17 is disposed on the outer side of the connection plate 16, i.e., on the side of the connection plate 16 away from the electrical core. The first plate 14 and the first battery module 21 are in heat transfer contact with one side of the boundary beam, the second plate 15 and the second battery module 22 are in heat transfer contact, optionally, the first plate 14 and the first battery module 21 are bonded through the heat conducting adhesive layer 13, the second plate 15 and the second battery module 22 are bonded through the heat conducting adhesive layer 13, and a gap for avoiding an end plate is further arranged between the connecting plate 16 and the first battery module 21 so as to facilitate the installation of the battery cell. The setting positions of the metal layer 11 and the graphene layer 12 can be set by a person skilled in the art, and the graphene layer 12 can be set to be close to the battery cell, or the metal layer 11 can be set to be close to the battery cell, and optionally, the material of the metal layer 11 is aluminum alloy. However, it should be noted that the material of the metal layer 11 may be aluminum alloy, metal aluminum, metal silver or copper, etc., and those skilled in the art can set the specific material of the metal layer 11 according to the need, which is not limited in any way and falls within the scope of the present utility model.

The first direction and the second direction may be set by those skilled in the art, for example, the first direction is the X direction in fig. 1, and the second direction is the Y direction in fig. 1.

Further, in the second direction, the lengths of the first battery module 21 and the second battery module 22 are L, the length of the first plate 14 is L1, and the length of the second plate 15 is L2, satisfying L1/L as 1/5 to 1; the larger the length L1 of the first plate 14, the larger the contact area between the first plate 14 and the first battery module 21, and in the same way, the larger the length L2 of the second plate 15, the larger the contact area between the second plate 15 and the second battery module 22, and the size of L, L, L2 can be set by a person skilled in the art according to the actual heat dissipation requirement. Preferably, the battery pack comprises two temperature equalizing plates 1 which are arranged vertically symmetrically, wherein the two temperature equalizing plates 1 are in heat transfer contact with the first battery module 21 and the second battery module 22, and the two temperature equalizing plates 1 are respectively installed from the upper end part and the lower end part of the first battery module 21, so that the installation and the disassembly of the temperature equalizing plates 1 are more facilitated, and the L1/L is 1/5-2/5; L2/L is 1/5-1/2, the first plate 14 conducts heat with the electric cores at the four corners of the first battery module 21, and the second plate 15 is close to the middle electric core part of the second battery module 22, so that the heat of the middle part of the second battery module 22 can be conducted to the four corners of the first battery module 21, namely, the heat of the high-temperature position is conducted to the low-temperature position, and the balance of the cost and the heat conducting effect of the temperature equalizing plate 1 can be realized.

The inventor also discovers through research that the low-temperature standing temperature field distribution characteristic of the battery pack is that the temperature of four corner electric cores of the battery module in the battery pack is low, the electric core temperature of the middle battery module is relatively high, the electric cores at the four corners become the performance bottleneck of charge and discharge, and the U-shaped temperature equalization plate 1 structure conducts the heat of the central area of the battery pack to the four corners, so that the battery pack temperature is more balanced, and the bottleneck temperature value of the electric cores at the four corners is improved. Therefore, although the present utility model is described with the number of the battery modules 2 being three, it is not intended to limit the number of the battery modules 2 inside the battery pack in any way, and the number of the battery modules 2 may be four, five or six, ten, etc., and those skilled in the art can set themselves as required, as long as the heat in the central region of the battery pack can be guided to the four corner regions of the battery pack through the temperature equalizing plate 1, and all fall within the scope of the present utility model.

The temperature equalizing plate 1 is made of multiple layers of materials, the area fixed with the battery module 2 is made of a heat conducting glue layer 13, a metal layer 11 and a graphene heat conducting layer 12, and the active heat preservation area of the turning area is made of the graphene heat conducting layer 12, the metal layer 11 and a heating body 17. In the heat preservation operating mode of standing, the electric core heat of middle region is led to the four corners region through samming board 1, contains graphene heat conduction material in samming board 1 for the temperature difference of whole package is less when long-time low temperature is stood, and the temperature of battery package peripheral edge is low in the heat preservation process, and middle part temperature is high, and the heat in middle part high temperature region is transmitted to the edge low temperature region to the use of samming board 1, improves the temperature in edge low temperature region.

If the parking time is too long, an active heat preservation function is required to be started, the heating body 17 in the turning area is locally loaded with a small-area heat source, the whole temperature-uniforming plate 1 can be quickly heated, and the energy consumption is lower and the effect is better through an intermittent opening strategy. Furthermore, a heating body 17 is arranged in the turning area of the temperature equalizing plate 1 and is used as an active heat preservation device, and compared with the prior art that a heating film is paved on a battery cell, the heating film is smaller in occupied area and better in energy consumption.

The active heat preservation mode starting strategy is that the temperature of the battery cell is lower than a threshold value, and the temperature of four corners of the battery cell is obviously lower. Specifically, tmin < T _{Threshold value} and T _{4 Corner angle ave}＜T_ave -n, heating body 17 is turned on to heat the turning region of the battery cell, heat is rapidly conducted to each position of the battery pack through temperature equalizing plate 1, and heating body 17 is turned off at T _{4 Corner angle ave}＞T_ave +n.

It should be noted that the specific type of the heating body 17 is not limited in the present utility model, the heating body 17 may be a heating film or a heating wire, or may be an electric heating sheet, and the electric heating sheet may be made of materials such as ceramics, mica, glass, etc., and the electric heating sheet may be electrically heated, or the heating body 17 may be a resistance wire, a thermistor, etc., and those skilled in the art may set the specific type of the heating body 17 as required, and all fall within the scope of the present utility model.

The foregoing embodiments are merely illustrative of the principles of the present utility model, and are not intended to limit the scope of the utility model, as those skilled in the art can modify the above structure without departing from the principles of the present utility model, so that the present utility model can be applied to more specific application scenarios.

In addition, the utility model also provides an electric device, which is provided with the battery pack in any embodiment.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims

1. A battery pack, comprising:

a battery module including a plurality of stacked cells;

The temperature equalization plate is in heat transfer contact with the battery module;

2. The battery pack of claim 1, wherein the temperature equalization plate is bonded to the battery module by a thermally conductive adhesive layer.

3. The battery pack according to claim 1 or 2, wherein the graphene layer is bonded to the metal layer by a heat conductive adhesive; or the graphene layer is sprayed on the metal layer.

4. The battery pack of claim 1, wherein the battery modules comprise a first battery module and a second battery module disposed side-by-side along a first direction, the first battery module being proximate to an edge beam of the battery pack, the second battery module being disposed on a side of the first battery module remote from the edge beam; the temperature equalization plate is in heat transfer contact with the first battery module and the second battery module.

5. The battery pack according to claim 4, wherein the temperature equalizing plate includes a first plate, a connection plate, and a second plate connected in this order, the first plate and the second plate each extending in a second direction, the second direction being perpendicular to the first direction;

6. The battery pack of claim 5, wherein the first plate is in heat transfer contact with a side of the first battery module adjacent the side rail.

7. The battery pack according to claim 6, wherein in the second direction, the first and second battery modules have a length L, the first plate has a length L1, and the second plate has a length L2, satisfying L1/L of 1/5 to 1; L2/L is 1/5-1.

8. The battery pack of claim 7, wherein the battery pack comprises two temperature equalization plates symmetrically disposed in heat transfer contact with the first battery module and the second battery module; the L1/L is 1/5-2/5; L2/L is 1/5-1/2.

9. The battery pack according to any one of claims 5 to 8, wherein a heating body is further provided on the temperature equalizing plate.

10. The battery pack according to claim 9, wherein the heating body is provided on the connection plate.