CN221304801U

CN221304801U - Battery pack and power device

Info

Publication number: CN221304801U
Application number: CN202323221750.5U
Authority: CN
Inventors: 曲凡多; 李猛; 马晓宇
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-11-28
Filing date: 2023-11-28
Publication date: 2024-07-09
Anticipated expiration: 2033-11-28

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery pack and a power device, the battery pack includes a thermal management mechanism and a battery module, a plurality of battery cells are arranged in the battery module, and at least one side of the battery module is provided with a heat spreader; the thermal management mechanism is fitted on the heat spreader, and the thermal management mechanism includes a flexible member, and a heat exchange medium flows in the flexible member to exchange heat with the battery cell. The battery pack can place the cooling structure externally, reduce the weight of the thermal management structure, and avoid the risk of damaging the battery cell when the flexible member ruptures and leaks, thereby improving the safety of the battery pack and ensuring the heat exchange capacity of the thermal management structure for the battery cell.

Description

Battery pack and power device

Technical Field

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

Background

The power battery is used as a power source of the electric vehicle, and the performance of the power battery directly influences the whole vehicle performance of the vehicle. The battery pack is often provided with a thermal management structure to balance the heat of the battery so that the battery can be used at an optimal temperature, since the battery can be used in both high temperature environments and low temperature environments to adversely affect the performance and service life of the battery.

The existing thermal management structure of the battery pack is generally formed by stamping or blowing a cold plate structure, and the thermal management structure is placed inside the battery pack and attached to the battery core to perform thermal management on the battery system. The thermal management structure is attached to the battery cell, and has a certain structural strength to strengthen the structural strength of the battery cell, so that the wall thickness of the thermal management structure is generally thicker and heavier, resulting in larger size and low energy density of the battery pack. And, thermal management structure sets up in the battery package is inside, and the risk that the electric core short circuit takes place, the security is poor that the problem such as joint seepage, local fracture probably appears.

Therefore, it is desirable to provide a battery pack and a power device to solve the above-mentioned problems.

Disclosure of utility model

An object of the present utility model is to provide a battery pack, which can externally arrange a cooling structure, reduce the weight of a thermal management structure, and simultaneously ensure the heat exchange capability of the thermal management structure to a battery cell.

To achieve the purpose, the utility model adopts the following technical scheme:

a battery pack, comprising:

the battery module is internally provided with a plurality of electric cores, and at least one side of the battery module is provided with a vapor chamber;

And the heat management mechanism is attached to the vapor chamber and comprises a flexible part, and a heat exchange medium is arranged in the flexible part in a flowing manner so as to exchange heat with the battery cell.

Optionally, the heat management mechanism further includes a liquid inlet pipe and a liquid outlet pipe, where the liquid inlet pipe and the liquid outlet pipe are both connected to the flexible member, the liquid inlet pipe can be connected to a water outlet of an external refrigeration mechanism, and the liquid outlet pipe can be connected to a water return port of the external refrigeration mechanism, so that a heat exchange medium flows through the flexible member.

Optionally, the liquid outlet pipe is provided with a pressure regulating valve to regulate that the internal pressure of the flexible member is greater than the external pressure of the flexible member.

Optionally, two battery modules are provided, the two battery modules are disposed opposite to each other, and the thermal management mechanism is sandwiched between the two battery modules.

Optionally, a supporting member is further disposed between the two soaking plates to support the two battery modules.

Optionally, a sealing element is further arranged between the two soaking plates, the sealing element encloses to form a sealing cavity, and the thermal management mechanism is arranged in the sealing cavity.

Optionally, the soaking plate further comprises a gasket, wherein the gasket is arranged between the two soaking plates and is positioned at the joint of the two soaking plates.

Optionally, the thermal management mechanism further includes a heating element, where the heating element is disposed on an outer wall of the flexible element or the soaking plate, and the heating element is used to heat the electrical core.

Optionally, the heating element is a resistance wire, a heating film or a PTC.

An object of the present utility model is to provide a power device, which can externally arrange a cooling structure, reduce the weight of a thermal management structure, and simultaneously ensure the heat exchange capability of the thermal management structure to an electric core.

a power plant comprising a battery pack as described in any one of the above aspects.

The utility model has the beneficial effects that:

the utility model provides a battery pack and a power device, wherein the heat management mechanism is arranged externally, the external heat management mechanism comprises a flexible part, the heat exchange structure is arranged as the flexible part, so that the wall thickness of the heat management mechanism is reduced, the weight of the heat management mechanism is reduced, the risk of damaging a battery core when the flexible part breaks and leaks liquid is avoided, the safety of the battery pack is improved, meanwhile, the heat management mechanism can ensure the heat exchange effect of the heat management mechanism on the battery core, the battery pack can be maintained to operate within the optimal operating temperature range, and the service life of the battery pack is prolonged.

Drawings

Fig. 1 is an isometric view of a battery pack provided in an embodiment of the utility model;

fig. 2 is an exploded view of a battery pack according to an embodiment of the present utility model;

FIG. 3 is an isometric view of a battery pack with one battery module removed according to an embodiment of the present utility model;

FIG. 4 is an isometric view of a battery pack with one battery module and thermal management mechanism hidden from view according to an embodiment of the present utility model;

fig. 5 is a cross-sectional view of a battery pack provided in an embodiment of the present utility model;

FIG. 6 is an enlarged view at A in FIG. 5;

Fig. 7 is an isometric view of a battery module with a hidden soaking plate according to an embodiment of the present utility model.

In the figure:

10. A battery module; 11. a soaking plate; 12. a battery cell; 13. a thin-walled shell;

20. A thermal management mechanism; 21. a flexible member; 211. a body portion; 212. an inlet; 213. an outlet; 22. a liquid inlet pipe; 23. a liquid outlet pipe;

30. a support; 40. a seal; 41. an avoidance port; 50. a gasket.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. 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 structures related to the present utility model are shown in the drawings.

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 battery pack and the power device provided by the utility model are described below with reference to fig. 1 to 7.

Referring to fig. 1 and 2, specifically, the battery pack includes a thermal management mechanism 20 and a battery module 10, a plurality of electric cells 12 are disposed in the battery module 10, and a soaking plate 11 is disposed on at least one side of the battery module 10; the thermal management mechanism 20 is attached to the soaking plate 11, the thermal management mechanism 20 includes a flexible member 21, and a heat exchange medium is disposed in the flexible member 21 to exchange heat with the electrical core 12.

The battery pack in this embodiment, through with external thermal management mechanism 20, and external thermal management mechanism 20 includes flexible piece 21, set up heat transfer structure as flexible piece 21 for heat transfer structure wall thickness reduces, has reduced thermal management mechanism 20's weight, and still avoided flexible piece 21 to break the risk of damaging electric core 12 when leaking, improved the security of this battery pack, simultaneously, this thermal management mechanism 20 can also ensure this thermal management mechanism 20 to the heat transfer effect of electric core 12, has guaranteed that this battery pack can maintain the operation in the best operating temperature range, has improved the life of this battery pack.

Referring to fig. 2 to 6, in the present embodiment, the flexible member 21 is in a bag-shaped structure, the bag-shaped structure is filled with a heat exchange medium, the heat exchange medium can heat or cool the heat exchange medium through a heat exchange device, and the heated or cooled heat exchange medium is provided for the flexible member 21, so as to heat or cool the battery cell 12.

Specifically, the flexible member 21 includes a body portion 211, an inlet 212 and an outlet 213, the inlet 212 and the outlet 213 being used for the ingress and egress of heat exchange medium, the body portion 211 being used for the circulation of internal heat exchange medium and for heat exchange with the battery module 10.

Alternatively, the flexible member 21 is made of a polymer material or a composite material which has toughness and can block the heat exchange medium, i.e. the flexible member 21 has a certain deformation degree and can ensure that the heat exchange medium cannot leak, so as to exchange heat with the battery module 10 better.

Further, the internal pressure of the flexible member 21 is greater than the external pressure of the flexible member 21, so that the flexible member 21 can be in a bulge state, the flexible member 21 and the soaking plate 11 are completely attached, the heat conduction effect of the thermal management mechanism 20 is improved, the heat conduction structure is not required to be increased at the contact position of the thermal management mechanism 20 and the battery module 10, the number of parts is simplified, and the weight of the battery pack is reduced.

Specifically, the flexible member 21 is provided with a pressure regulating valve to regulate the internal pressure of the flexible member 21, thereby achieving the effect that the internal pressure of the flexible member 21 is always greater than the external pressure of the flexible member 21.

Further, the thermal management mechanism 20 further includes a liquid inlet pipe 22 and a liquid outlet pipe 23, both the liquid inlet pipe 22 and the liquid outlet pipe 23 are connected to the flexible member 21, the liquid inlet pipe 22 can be connected to a water outlet of an external heat exchange device, and the liquid outlet pipe 23 can be connected to a water return port of the external heat exchange device, so that a heat exchange medium flows through the flexible member 21.

Specifically, the liquid inlet pipe 22 communicates with the inlet 212 of the flexible member 21, and the liquid outlet pipe 23 communicates with the outlet 213 of the flexible member 21, so that the heat exchange medium can flow in from the inlet 212 and flow out from the outlet 213.

Further, the liquid outlet pipe 23 is provided with the pressure regulating valve, and a certain pressure value is set at the liquid outlet pipe 23, so that after the heat exchange medium flows into the flexible member 21 from the liquid inlet pipe 22, the heat exchange medium can flow out from the liquid outlet pipe 23 after reaching a certain pressure, so as to regulate the internal pressure of the flexible member 21 to be larger than the external pressure of the flexible member 21.

When the heat exchange medium is heated, the heat exchange medium is conveyed into the flexible piece 21 after being heated by external heat exchange equipment, and then the electric core 12 is heated, so that the heating speed is low. Therefore, in this embodiment, the thermal management mechanism 20 further includes a heating element, which is disposed on the outer wall of the flexible element 21 or the soaking plate 11, and the heating element is used for heating the electrical core 12, that is, directly heating the electrical core 12 through the heating element, so that the heating rate is improved, and the electrical core 12 can be heated more quickly.

It should be noted that, when the thermal management mechanism 20 includes a heating element, the flexible element 21 is only used to cool the battery cell 12, so as to avoid wasting resources.

Optionally, the heating element is a resistance wire, a heating film or PTC (Positive Temperature Coefficient ), and the above structures can achieve an electric heating effect, so as to rapidly heat the battery cell 12, which is not particularly limited herein.

Illustratively, the heating element in this embodiment is a resistance wire, and the heating element is disposed on the outer wall of the flexible element 21 to heat the battery cell 12.

Specifically, the heating element is pre-buried to be arranged on the outer wall of the flexible element 21, so as to fix and protect the heating element, and the integration effect of the thermal management mechanism 20 can be realized.

Further, the heating member is formed by winding the resistance wire, so that the heating member is distributed on the outer wall of the flexible member 21, and when the heating member is heated, the heating member is conducted through an external power supply, so that the heating member is started to be heated, and under the action of the outer wall of the flexible member 21, the heating member is attached to the temperature equalizing plate, and heat exchange between the heating member and the battery module 10 is better realized.

Referring to fig. 2 and 7, in the present embodiment, the soaking plate 11 is made of a thin-walled aluminum plate or a thin-walled steel plate, so that it can exchange heat of the thermal management structure to the electrical core 12.

Optionally, a heat conducting member is further disposed between the soaking plate 11 and the electrical core 12, so as to further increase the heat exchange effect of the electrical core 12 and the thermal management structure.

Further, the battery module 10 further comprises a thin-wall shell 13, the thin-wall shell 13 is loaded with a plurality of electric cores 12, and the vapor chamber 11 is connected with the thin-wall shell 13 in a sealing manner; the provision of the thin-walled housing 13 reduces the weight of the battery module 10 while increasing the energy density of the battery module 10, thereby increasing the energy density of the battery pack.

Referring to fig. 3 to 6, in the present embodiment, one or at least two battery modules 10 can be provided with the thermal management structure, and the battery modules 10 can be stacked directly without changing other structures of the battery pack.

In some embodiments, two battery modules 10 are provided, two battery modules 10 are disposed opposite to each other, and the thermal management mechanism 20 is sandwiched between two battery modules 10, i.e., the thermal management mechanism 20 may also be directly disposed for the battery pack of the dual-layer battery cell 12, and the battery modules 10 are standardized, and the provision of one thermal management mechanism 20 is reduced, so that the weight is further reduced and the energy density of the battery pack is improved while ensuring the thermal management performance of the battery pack.

Further, a supporting member 30 is further disposed between the two soaking plates 11 to support the two battery modules 10, so that the two battery modules 10 will not crush the flexible member 21, and stable operation of the thermal management mechanism 20 of the battery pack is ensured.

Optionally, the support 30 is adhesively connected to the soaking plate 11, so that the two are hermetically connected, and thus a fixed connection between the two battery modules 10 can also be achieved.

Still further, there is a seal member 40 between two soaking plates 11, the seal member 40 encloses and closes and forms the sealed cavity, there are thermal management mechanisms 20 in the sealed cavity; that is, the sealing member 40 encloses a sealed space between the two soaking plates 11, so as to avoid the pollution of the environment caused by the leakage of the flexible member 21. And, the provision of the sealing chamber makes it possible to ensure that the outer surface thereof is sufficiently contacted with the surface of the battery module 10 under the action of the sealing chamber even if the flexible member 21 loses the air pressure.

Optionally, the seal 40 is further provided with a relief port 41 to relieve the inlet 212 and outlet 213 of the flexible member 21.

Still further, the battery pack further includes a gasket 50, the gasket 50 is disposed between the two soaking plates 11 and is located at the joint of the two soaking plates 11, and the gasket 50 is disposed not only to support the two battery modules 10, but also to connect with the two soaking plates 11, so as to enhance the connection strength between the two battery modules 10.

The embodiment also provides a power device, which comprises the battery pack according to any one of the above schemes. The power device has all the beneficial effects of the battery pack, and the description is omitted here.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A battery pack, comprising:

the heat management mechanism is arranged on the vapor chamber in a fitting way and comprises a flexible part, and a heat exchange medium is arranged in the flexible part in a flowing way so as to exchange heat with the battery cell.

2. The battery pack according to claim 1, wherein the thermal management mechanism further comprises a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are both communicated with the flexible member, the liquid inlet pipe can be communicated with a water outlet of an external refrigeration mechanism, and the liquid outlet pipe can be communicated with a water return port of the external refrigeration mechanism, so that a heat exchange medium flows through the flexible member.

3. The battery pack according to claim 2, wherein the drain pipe is provided with a pressure regulating valve to regulate that the internal pressure of the flexible member is greater than the external pressure of the flexible member.

4. The battery pack of claim 1, wherein two battery modules are provided, the two battery modules being disposed opposite each other, and the thermal management mechanism is interposed between the two battery modules.

5. The battery pack of claim 4, wherein a support member is further provided between the two soaking plates to support the two battery modules.

6. The battery pack of claim 4, wherein a sealing member is further disposed between the two soaking plates, the sealing member encloses a sealing cavity, and the thermal management mechanism is disposed in the sealing cavity.

7. The battery pack of claim 4, further comprising a gasket disposed between the two soaking plates and at a junction of the two soaking plates.

8. The battery pack of any one of claims 1-7, wherein the thermal management mechanism further comprises a heating element disposed on an outer wall of the flexible member or the soaking plate, the heating element configured to heat the electrical cells.

9. The battery pack of claim 8, wherein the heating member is a resistance wire, a heating film, or a PTC.

10. A vehicle power plant comprising a battery pack according to any one of claims 1-9.