WO2020001126A1

WO2020001126A1 - Battery pack

Info

Publication number: WO2020001126A1
Application number: PCT/CN2019/082099
Authority: WO
Inventors: 姜胜利; 邱福生
Original assignee: 爱驰汽车有限公司
Priority date: 2018-06-29
Filing date: 2019-04-10
Publication date: 2020-01-02

Abstract

Provided in the present invention is a battery pack, comprising: a box body assembly, the box body assembly comprising an accommodating space; a separation plate which is located within the box body assembly and which causes the accommodating space to be partitioned into a first communication region and a second communication region, said first communication region and said second communication region being independent from one another; a battery module which is located in the first communication region; and a liquid cooling assembly which is located in the second communication region, the liquid cooling assembly and the battery module performing heat conduction by means of the separation plate. The battery pack provided in the present invention enhances the reliability of battery packs.

Description

Battery pack

Technical field

The present invention relates to an electric vehicle, and more particularly, to a battery pack.

Background technique

At present, in liquid-cooled battery packs, battery modules, BMS (Battery Management System), wiring harnesses, cooling systems, etc. are usually within the communication domain formed by the battery pack case, and the battery modules are usually in thermal conduction with the cooling system Parts (such as liquid cold plates) are in direct contact. When antifreeze leaks and condensation occur on the cooling system pipeline, the battery module, BMS, and wiring harness are located in the same communication area with the cooling system. As a result, the battery module, BMS, and wiring harness will directly contact the liquid. Especially when cracks appear in the pipes of the cooling system, it will cause high-pressure antifreeze spray in the pipes, causing problems such as insulation failure, corrosion, accelerated aging, and loose connections.

Summary of the invention

In view of the problems in the prior art, an object of the present invention is to provide a battery pack to increase the reliability of the battery pack.

According to an aspect of the present invention, a battery pack is provided, including:

A box assembly having a receiving space;

A partition plate located in the box component, so that the accommodating space is divided into a first connected domain and a second connected domain, and the first connected domain and the second connected domain are independent of each other;

A battery module located in the first communication domain; and

A liquid-cooled component is located in the second communication domain, and the liquid-cooled component and the battery module perform heat conduction through the separator.

Optionally, the box component includes:

The box side frame and the first cover plate and the second cover plate placed on both sides of the box side frame, wherein,

The box side frame, the first cover plate and the partition plate form a closed first communication domain;

The box side frame, the second cover plate and the partition plate form a closed second communication domain.

Optionally, it further includes:

A first thermally conductive layer filled between the battery module and the separator;

The liquid cooling component includes:

Liquid cold plate

A second thermally conductive layer is filled between the liquid-cooled plate and the partition.

Optionally, when the area of the liquid-cooled plate is less than a predetermined threshold, the second thermally conductive layer is a thermally conductive adhesive that fixes the liquid-cooled plate on the partition.

Optionally, the liquid cooling component further includes:

A support assembly that fixes the liquid cooling plate on the partition plate and provides a pressing force toward the partition plate to the liquid cooling plate.

Optionally, the support assembly includes an elastic support member extending from the bottom of the box assembly to the liquid cooling plate.

Optionally, the support assembly includes a bead, and the bead is mechanically connected to the partition plate to press the liquid cooling plate between the bead and the partition plate, wherein,

The bead comprises a curved-shaped bending piece for accommodating all liquid-cooled plates, and both ends of the curved-shaped bending piece are mechanically connected to the partition plate; or

The bead comprises a plurality of crooked bending pieces which respectively accommodate the liquid cooling plate, and both ends of each of the crooked bending pieces are mechanically connected to the partition plate.

Optionally, when the bead comprises a plurality of curved-shaped bending pieces, the mechanical connecting portions are shared by the adjacent ends of adjacent curved-shaped bending pieces.

Optionally, the support assembly further includes an elastic support member extending from the bottom of the box assembly to the bead, wherein the number of the elastic support members corresponds to the number of the several-shaped bending members.

Optionally, the liquid cooling assembly further includes a battery pack liquid cooling current collector, which is located in the second communication domain.

The battery pack provided by the present invention has the following advantages:

The accommodating space of the box component is separated by a partition to form a first communication domain for accommodating a battery module and a second communication domain for accommodating a liquid-cooled component. The first communication domain and the second communication domain are independent of each other. Under the premise that the heat transfer through the partition and the liquid-cooled components do not affect the cooling of the battery module, the anti-freezing liquid of the liquid-cooled components can be prevented from leaking, and condensation can contact the battery modules in the first Unicom domain, and the battery management system connected to the battery modules. And wiring harness to reduce the possibility of damage to the battery module and the battery management system and the wiring harness connected to the battery module due to contact with liquid, thereby improving the reliability of the battery pack.

BRIEF DESCRIPTION OF THE DRAWINGS

By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent;

FIG. 1 is a sectional view of a battery pack according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a battery pack according to a second embodiment of the present invention.

Fig. 3 is a sectional view of a battery pack according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a battery pack according to a fourth embodiment of the present invention.

Fig. 5 is a sectional view of a battery pack according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a battery pack according to a sixth embodiment of the present invention.

Fig. 7 is a sectional view of a battery pack according to a seventh embodiment of the present invention.

FIG. 8 is a sectional view of a battery pack according to an eighth embodiment of the present invention.

FIG. 9 is a sectional view of a battery pack according to a ninth embodiment of the present invention.

FIG. 10 is an enlarged view of an area A in FIG. 9.

detailed description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and their repeated description will be omitted.

First, a battery pack provided by the present invention will be described with reference to FIGS. 1 to 8. First, referring to FIG. 1, FIG. 1 is a cross-sectional view of a battery pack according to a first embodiment of the present invention.

The battery pack 100 includes a case assembly 110, a separator 120, a battery module 130, and a liquid cooling assembly 140. The box assembly 110 has a receiving space. The partition 120 is located in the box assembly 110, so that the accommodating space is divided into a first communication domain 101 and a second communication domain 102. The first connected domain 101 and the second connected domain 102 are independent of each other. In other words, the first connected domain 101 and the second connected domain 102 are not connected to each other. The battery module 130 is located in the first communication domain 101. A liquid-cooled component 140 is located in the second communication domain 102. The liquid-cooled component 140 and the battery module 130 conduct heat through the separator 120. The separator 120 is preferably made of a material with better thermal conductivity to enhance the thermal conductivity. For example, the separator 120 may be an aluminum alloy material.

The battery pack provided by the present invention separates the accommodating space of the box component by a partition to form a first communication domain accommodating the battery module and a second communication domain accommodating the liquid-cooled component, the first communication domain and the second The communication domains are independent of each other. Under the premise that the heat transfer through the separator does not affect the cooling of the battery modules, the anti-freeze leakage of the liquid-cooled components and condensation can be prevented from contacting the battery modules and connections in the first Unicom domain. The battery management system and the wiring harness of the battery module reduce the possibility of damage to the battery module and the battery management system and the wiring harness connected to the battery module due to contact with liquid, thereby improving the reliability of the battery pack.

Referring next to FIG. 2, FIG. 2 is a sectional view of a battery pack according to a second embodiment of the present invention. Similar to FIG. 1, the battery pack 100 includes a box assembly 110, a separator 120, a battery module 130, and a liquid cooling assembly.

The box assembly 110 has a receiving space. The box assembly 110 includes a box side frame 111 and a first cover plate 112 and a second cover plate 113 which are placed on both sides of the box side frame 111. The box side frame 111, the first cover plate 112, and the partition plate 120 form a closed first communication domain 101. The box side frame 111, the second cover plate 113, and the partition plate 120 form a closed second communication domain 102. Specifically, the battery pack separator 120 (the separator 120 may be welded to the box beam that separates the battery module 130) and the box side frame 111 are welded together, thereby being connected to the battery pack first cover plate 112. Together, they form a closed first communication domain 101, and water cannot flow into this area. The second cover plate 113 and the case side frame 111 of the battery pack 100 are welded together to form a closed second communication domain 102 together with the separator 120 to prevent the outside weather, sand and corrosive substances from directly contacting the battery pack 100 Liquid-cooled components. The first connected domain 101 and the second connected domain 102 are independent of each other. In other words, the first connected domain 101 and the second connected domain 102 are not connected to each other.

In the battery pack 100, battery pack components other than the liquid-cooled components (cooling pipes and auxiliary parts of the cooling pipes), such as a battery management system and a wiring harness connected to a battery module, are located in the first communication domain 101. The liquid cooling component is located in the second communication domain 102. The liquid in the second communication domain 102 due to the leakage or condensation of the antifreeze of the liquid cooling component cannot be sprayed or flowed from the second communication domain 102 into the first communication domain 101. The liquid-cooling component of the battery pack 100 is located at the lower part of the separator 120 and is closely adhered to the battery-pack separator 120, so that the liquid-cooling component and the battery module 130 perform efficient heat conduction through the separator 120.

In this embodiment, the battery pack 100 further includes a first thermally conductive layer 150 filled between the battery module 130 and the separator 120. The first heat-conducting layer 150 may be made of a soft heat-conducting material, such as a heat-conducting pad or a heat-conducting glue, to fill the gap and tolerance between the bottom of the battery module 130 and the separator 120. The liquid cooling component includes a liquid cooling plate 142 and a second thermally conductive layer 141. The liquid cooling plate 142 may have various forms. For example, the liquid cooling plate 142 may be a liquid cooling flat tube. The second thermally conductive layer 141 is filled between the liquid-cooled plate 142 and the separator 120. The second heat-conducting layer 141 may also use a soft heat-conducting material, such as a heat-conducting pad or a heat-conducting glue, to fill the gap and tolerance between the liquid-cooled plate 142 and the partition 120. Therefore, by providing the first heat conductive layer 150 and the second heat conductive layer 141, the heat conduction between the battery module 130 and the liquid cooling plate 142 can be increased, and the influence of the gap between the battery module 130 and the separator 120 can be prevented. The heat conduction between the liquid-cooling plate 142 and the separator 120 is temporarily affected, thereby affecting the heat conduction between the battery module 130 and the liquid-cooling plate 142.

In this embodiment, since the area of the liquid-cooling plate 142 is smaller than a predetermined threshold, the second heat-conducting layer 141 is a thermally conductive adhesive that fixes the liquid-cooling plate 142 to the partition 120. on. In the embodiment in which the liquid-cooling plate 142 is fixed on the partition plate 120 only by using a thermally conductive adhesive, considering the heat conduction between the liquid-cooling plate 142 and the partition 120 and the viscosity of the thermally conductive adhesive is sufficient to tighten the liquid-cooling Plate 142. In a specific implementation, the cross section of the liquid cooling plate 142 as shown in FIG. 2 is divided into multiple sections, and the width of the cross section of the liquid cooling plate 142 in each section needs to be greater than the interval between the liquid cooling plates 142. The width of each section of the liquid-cooled plate 142 in the cross-section shown in FIG. 2 needs to be less than one-fifth of that of the first heat-conducting layer 150. The present invention is not limited thereto.

Specifically, the above only describes a specific embodiment of the present invention, and the present invention is not limited thereto. In actual implementation, for a liquid-cooled plate with a relatively small area, a thermally conductive glue may be preferably used to conduct heat; for a liquid-cooled plate with a relatively large area, a thermally conductive pad may be preferably used. When the area of the liquid-cooled plate is large, if a glue is applied, a large area of thermally conductive glue is needed to fix the liquid-cooled plate. The large-area liquid-cooled plate and the partition plate have poor rigidity, and the mechanical strength of the thermally conductive glue itself It is relatively weak, so it will not adhere well. Therefore, a thermal pad is recommended. When the area is relatively small, on the contrary, because the rigidity of the cold plate is better, the stress that the glue bears is relatively small, and the glue can meet the mechanical properties.

3, FIG. 3 is a cross-sectional view of a battery pack according to a third embodiment of the present invention. Similar to FIG. 2, the battery pack 100 includes a box assembly 110, a separator 120, a battery module 130, and a liquid cooling assembly.

In a third embodiment, the liquid cooling assembly further includes a support assembly. The support assembly fixes the liquid-cooling plate 142 on the partition plate 120 and provides a pressing force toward the partition plate 120 to the liquid-cooling plate 142. As a result, the efficiency of heat conduction between the liquid-cooling plate 142 and the partition 120 is increased. At the same time, considering that the connection strength of the second heat-conducting layer 141 and the liquid-cooling plate 142 decreases with time, the supporting assembly can press the liquid-cooling plate 142 to Between the support assembly and the partition 120. In the embodiment shown in FIG. 3, the supporting assembly may include an elastic supporting member 162 extending from the bottom of the box assembly 110 to the liquid cooling plate 142. The elastic support member 162 may be a spring, an elastic foam, or other porous material that is soft and absorbs energy. The present invention is not limited thereto. In this embodiment, since the liquid-cooling plate 142 is supported by the elastic support member 162, the second thermally conductive layer 141 may not be limited to a thermally conductive adhesive, and the second thermally conductive layer 141 may also be in the form of a thermally conductive pad. Further, since the liquid cooling plate 142 is supported by the elastic support member 162, the width of the liquid cooling plate 142 in a cross section may not be limited. Preferably, the contact area between the elastic support member 162 and the liquid-cooled plate 142 is smaller than the area of the liquid-cooled plate 142, and the difference between the area of the elastic support 162 and the area of the liquid-cooled plate 142 is less than a predetermined area value, so that the elastic support 162 faces the liquid-cooled plate 142. Provides uniform support compression. Further, the elastic support member 162 is aligned with the center of the liquid cooling plate 142 to maximize the supporting pressing force, thereby maximizing the heat conduction between the liquid cooling plate 142 and the partition 120.

4, FIG. 4 is a cross-sectional view of a battery pack according to a fourth embodiment of the present invention. Similar to FIG. 3, the battery pack 100 includes a box assembly 110, a separator 120, a battery module 130, and a liquid cooling assembly.

The liquid cooling assembly further includes a support assembly. The support assembly fixes the liquid-cooling plate 142 on the partition plate 120 and provides a pressing force toward the partition plate 120 to the liquid-cooling plate 142. In this embodiment, the support assembly includes a bead 162. The bead 162 is mechanically connected to the partition 120 (for example, by welding, the welding point 163 is shown in FIG. 4) to press the liquid cooling plate 142 between the bead 162 and the partition 120. . The bead 162 may be a metal bead. The bead 162 may be a spring leaf, and is assembled with the box structural beam in the form of a clamping groove. At the same time, in order to improve the seismic performance of the entire structure, a suitable insulation foam or a buffered energy-absorbing porous material can be selected between the bead 162 and the second cover to improve the vibration resistance and overall strength. In still other embodiments of the present invention, the surface of the bead 162 may be covered with a rubber material. The rubber material is a thermally conductive material, so that the bead 162 and the partition 120 are in good contact. In the process of avoiding vibration and shock, the bead 162 damages the liquid-cooled plate 142, and at the same time, ensure that the heat conduction path components are in close contact, and the heat conduction efficiency and heat conduction consistency The second Unicom area forms a good space, which effectively buffers the impact of crushed stones during the driving of the battery pack to protect the battery from damage.

In the embodiment shown in FIG. 4, the bead 162 is a one-piece bead (there is only one figure-shaped bending member, which accommodates a plurality of liquid cooling plates 142), that is, the bead 162 simultaneously performs a plurality of segmented liquid cooling plates 142. Support and provide the liquid cooling plate 142 with a pressing force toward the partition plate 120. The advantage of this embodiment is that it is convenient for the production of battens and at the same time facilitates the installation of battens. The gaps between the liquid-cooling plates 142 are all contained in the bead 162, so that the adjacent liquid-cooling plates 142 can conduct heat conduction through the gaps between them, thereby increasing the gaps between the adjacent liquid-cooling plates 142. The heat conduction of the liquid-cooling plate 142 to the separator 120 is uniform on the surface of the separator 120 facing the liquid-cooling plate 142.

5, FIG. 5 is a cross-sectional view of a battery pack according to a fifth embodiment of the present invention. Similar to FIG. 4, the battery pack 100 includes a box assembly 110, a separator 120, a battery module 130, and a liquid cooling assembly.

In this embodiment, the support assembly includes a bead 162. The bead 162 includes a plurality of fold-shaped bending pieces that respectively accommodate the liquid cooling plate, and two ends of each fold-shaped bending piece are mechanically connected to the partition plate 120. Specifically, the figure-shaped bending member of the bead 162 presses the liquid-cooling plate 142 between the bead 162 and the partition 120 in stages. In other words, in this embodiment, adjacent liquid-cooling plates 142 are cut off by bead 162, and the bead 162 is divided into a plurality of sections, each of which corresponds to providing a liquid-cooling plate 142 with support and a pressing force toward the partition plate 120, Therefore, the heat conduction between each section of the liquid cooling plate 142 and the partition plate 120 can be adjusted and adjusted by the pressing force provided by the bead 162, so as to achieve efficient heat conduction between the liquid cooling plate 142 and the partition plate 120.

6 is a sectional view of a battery pack according to a sixth embodiment of the present invention. Similar to FIG. 5, the battery pack 100 includes a box assembly 110, a separator 120, a battery module 130, and a liquid cooling assembly.

In this embodiment, the support assembly includes a bead 162. The bead 162 presses the liquid-cooled plate 142 between the bead 162 and the partition 120 in stages. In this embodiment, the adjacent liquid-cooled plates 142 are cut off by the bead 162, but the bead 162 is still integrated. The bead 162 has a plurality of bent pieces that respectively accommodate the liquid-cooled plate 142, and the adjacent bent pieces Share mechanical connection points (such as welding point 163). In this embodiment, each of the square-shaped bent pieces of the bead 162 provides support to a liquid-cooled plate 142 and a pressing force toward the partition plate 120, thereby facilitating the installation of the bead 162 and increasing the bead The pressing force provided by 162 to the liquid-cooling plate 142 toward the partition plate 120 increases the efficiency of heat conduction between the liquid-cooling plate 142 and the partition plate 120.

7 is a cross-sectional view of a battery pack according to a seventh embodiment of the present invention. Similar to FIG. 4, the battery pack 100 includes a box assembly 110, a separator 120, a battery module 130, and a liquid cooling assembly.

In this embodiment, the support assembly includes a bead 162 and an elastic support member 161 extending from the bottom of the box assembly 110 to the bead 162. In this embodiment, an elastic support member 161 is provided to further provide a pressing force toward the partition plate 120 to the integrated bead 162, thereby increasing the pressure provided by the bead 162 to the liquid cooling plate 142 toward the partition. The pressing force of 120 increases the efficiency of heat conduction between the liquid cooling plate 142 and the partition 120.

8 is a cross-sectional view of a battery pack according to a seventh embodiment of the present invention. Similar to FIG. 7, the battery pack 100 includes a box assembly 110, a separator 120, a battery module 130, and a liquid cooling assembly.

In this embodiment, the support assembly includes a bead 162 and an elastic support member 161 extending from the bottom of the box assembly 110 to the bead 162. In this embodiment, a plurality of elastic supporting members 161 are provided, and each elastic supporting member 161 corresponds to a crooked bending piece of a bead 162, and the bottom of the crooked bending piece of the bead 162 is provided toward the partition, respectively. The pressing force of 120 further increases the pressing force provided by the bottom wall of the several-shaped bent piece of each bead 162 toward the liquid-cooling plate 142 toward the partition plate 120 to increase the liquid-cooling plate 142 and the partition 120. Efficiency of heat transfer between.

In various embodiments of the present invention, the liquid-cooled component of the battery pack 100 may further be provided with a liquid-cooled current collector located in the second communication domain 102. The liquid-cooled current collector has a number of shunts inside, which are used to flow the liquid-cooled component into the liquid-cooled component. The flow of each liquid cooling plate is evenly distributed.

A ninth embodiment of the present invention is described below with reference to FIGS. 9 and 10. The battery pack 100 includes a box assembly 110, a separator 120, a battery module 130, and a liquid cooling plate 142. The battery pack beam (not shown) and the separator are welded together, and are welded together through the separator and the side frame of the case assembly 110. As shown in FIG. 9, the battery pack beam, the partition, the side frame, the first cover, the high-low pressure output port, and the breathing valve (not shown) together form a closed area, and water cannot flow into this area. The battery pack liquid-cooling component is located below the separator 120 and is closely attached to the separator 120. The battery pack beam, separator, side frame, and second cover plate are welded together to form a closed area to prevent external weather, sand, and corrosive substances from directly contacting the battery pack's liquid cold plate 142 and liquid cooling current collector 190. There are some shunts inside the battery pack liquid-cooled current collector, which are used to distribute the flow into each liquid-cooled plate uniformly.

The accommodating space of the box component is separated by a partition to form a first communication domain for accommodating a battery module and a second communication domain for accommodating a liquid-cooled component. The first communication domain and the second communication domain are independent of each other. Under the premise that the heat transfer through the partition and the liquid-cooled components do not affect the cooling of the battery module, the anti-freezing liquid of the liquid-cooled components can be prevented from leaking, and condensation can contact the battery modules in the first Unicom domain, and the battery management system connected to the battery modules And wiring harness to reduce the possibility of damage to the battery module and the battery management system and the wiring harness connected to the battery module due to contact with liquid, thereby improving the reliability of the battery pack.

The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without deviating from the concept of the present invention, several simple deductions or replacements can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

A battery pack, comprising:

A box assembly having a receiving space;

A partition plate located in the box component, so that the accommodating space is divided into a first connected domain and a second connected domain, and the first connected domain and the second connected domain are independent of each other;

A battery module located in the first communication domain; and

A liquid-cooled component is located in the second communication domain, and the liquid-cooled component and the battery module perform heat conduction through the separator.
The battery pack according to claim 1, wherein the case assembly comprises:

The box side frame and the first cover plate and the second cover plate placed on both sides of the box side frame, wherein,

The box side frame, the first cover plate and the partition plate form a closed first communication domain;

The box side frame, the second cover plate and the partition plate form a closed second communication domain.
The battery pack according to claim 1, further comprising:

A first thermally conductive layer filled between the battery module and the separator;

The liquid cooling component includes:

Liquid cold plate

A second thermally conductive layer is filled between the liquid-cooled plate and the partition.
The battery pack according to claim 3, wherein when the area of the liquid-cooled plate is smaller than a predetermined threshold, the second heat-conducting layer is a thermally conductive adhesive, and the thermally-conductive adhesive fixes the liquid-cooled plate to the liquid-cooled plate. On the clapboard.
The battery pack according to claim 3, wherein the liquid cooling component further comprises:

A support assembly that fixes the liquid cooling plate on the partition plate and provides a pressing force toward the partition plate to the liquid cooling plate.
The battery pack according to claim 5, wherein the supporting assembly comprises an elastic supporting member extending from the bottom of the box assembly to the liquid cooling plate.
The battery pack according to claim 5, wherein the support assembly includes a bead, and the bead is mechanically connected to the separator to press the liquid cooling plate between the bead and the separator, among them,

The bead comprises a curved-shaped bending piece for accommodating all liquid-cooled plates, and both ends of the curved-shaped bending piece are mechanically connected to the partition plate; or

The bead comprises a plurality of crooked bending pieces which respectively accommodate the liquid cooling plate, and both ends of each of the crooked bending pieces are mechanically connected to the partition plate.
The battery pack according to claim 7, characterized in that, when the bead comprises a plurality of shape-shaped bending pieces, the mechanical connection portion is shared by the adjacent ends of the adjacent shape-shaped bending pieces.
The battery pack according to claim 7, wherein the support assembly further comprises an elastic support member extending from the bottom of the box assembly to the bead, wherein the number of the elastic support members is equal to the number of the shape The number of bends corresponds.
The battery pack according to any one of claims 1 to 9, wherein the liquid-cooled component further comprises: a battery pack liquid-cooled current collector, which is located in the second communication domain.