Battery shell and energy storage system

Abstract

The invention relates to a battery shell and an energy storage system, which are used for solving the technical problems of high cooling cost, long immersion time and low cooling efficiency caused by more required cooling liquid during thermal runaway. The battery shell comprises a shell which comprises a containing cavity and a liquid limiting device, the containing cavity is suitable for containing a battery module, the liquid limiting device is arranged in the containing cavity, and in a first state, the liquid limiting device is arranged between the battery module and at least part of the side wall of the containing cavity; a liquid injection space can be formed between the liquid limiting device and part of the inner wall of the accommodating cavity or the liquid limiting device itself in a surrounding manner, the battery module is enclosed in the liquid injection space, and the liquid injection space is used for injecting cooling liquid for immersing the battery module.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy storage systems, and in particular, to a battery housing and an energy storage system. Background Art

[0002] In the related art, in a battery cabinet of an energy storage system, a sufficient electrical gap needs to be formed between the battery module and the cabinet body to avoid threatening the safety of maintenance personnel.

[0003] When thermal runaway occurs in one or some of the battery modules, coolant is usually injected into the battery cabinet to prevent the thermal runaway from spreading. However, sufficient electrical clearance will result in a large free space between the battery cabinet cavity wall and the battery module, which will result in more coolant being injected into the battery cabinet, resulting in higher cooling costs, longer injection time, and lower cooling efficiency. Summary of the invention

[0004] The purpose of the present disclosure is to provide a battery housing and an energy storage system to solve the technical problems of high cooling cost, long immersion time and low cooling efficiency caused by the large amount of coolant required during thermal runaway.

[0005] In order to achieve the above-mentioned objectives, the present disclosure provides a battery shell, comprising: a shell, comprising a accommodating cavity, the accommodating cavity is suitable for accommodating a battery module, and a liquid limiting device is arranged in the accommodating cavity, in a first state, the liquid limiting device is arranged between the battery module and at least a portion of the side wall of the accommodating cavity, between the liquid limiting device and a portion of the inner wall of the accommodating cavity or the liquid limiting device itself can form a liquid injection space, the liquid injection space encloses the battery module therein, and the liquid injection space is used to inject cooling liquid to immerse the battery module.

[0006] Optionally, the accommodating cavity includes a first cavity wall and a second cavity wall arranged opposite to each other, and the liquid limiting device includes a bag body, the bag body is sealedly connected to the first cavity wall, and an opening for avoiding the battery module is provided at one end of the bag body facing the second cavity wall, and the bag body is suitable for expanding and contracting between the first cavity wall and the second cavity wall. In the second state, the bag body is contracted and stored on the first cavity wall; in the first state, the bag body extends toward the second cavity wall to form the liquid injection space.

[0007] Optionally, the first cavity wall is the bottom wall of the accommodating cavity, the second cavity wall is the top wall of the accommodating cavity, and the maximum extended height of the bag body along the vertical direction is equal to or greater than the height of the battery module.

[0008] Optionally, a flow channel for injecting gas or liquid is provided in the bag body.

[0009] Optionally, the outer circumferential surface of the bag body is provided with a plurality of transverse reinforcement rings extending in the circumferential direction, and the plurality of transverse reinforcement rings are arranged at intervals in the vertical direction.

[0010] Optionally, the first cavity wall is the bottom wall of the accommodating cavity, the second cavity wall is the top wall of the accommodating cavity, a pull wire is provided at the top of the bag body, and a driving member is provided on the second cavity wall, and the driving member can drive the bag body to extend and retract in the vertical direction through the pull wire.

[0011] Optionally, the first cavity wall is the top wall of the accommodating cavity, the second cavity wall is the bottom wall of the accommodating cavity, and the bag body can extend in a vertical direction to be sealed and connected with the second cavity wall.

[0012] Optionally, a second magnet is provided on the first cavity wall, a third magnet is provided on the second cavity wall, a first magnet is provided at the bottom end of the bag body, two magnetic poles of the first magnet are arranged in a vertical direction, and the liquid limiting device is configured as follows: in the second state, the second magnet is attracted to the first magnet; in the first state, the second magnet is repelled from the first magnet, and the third magnet is attracted to the first magnet.

[0013] Optionally, a sliding block is provided on the outer peripheral surface of the bag body, and a sliding rail extending along the extension direction of the bag body is further provided in the accommodating cavity, and the sliding block is slidably provided on the sliding rail.

[0014] Optionally, the liquid limiting device includes an inflatable structure, and the inflatable structure is bonded to at least one side wall of the accommodating cavity. The liquid limiting device is configured as follows: in the first state, the inflatable structure expands toward the battery module; in the second state, the inflatable structure is in an unexpanded state and is tightly attached to the side wall of the accommodating cavity.

[0015] Optionally, the expandable structure is provided with a transverse limiting belt and / or a longitudinal limiting belt.

[0016] Based on the above technical solution, the present disclosure also provides an energy storage system, including: the battery housing in the above technical solution, a battery module accommodated in the accommodating cavity, and a thermal management module, including a liquid inlet pipeline and a liquid outlet pipeline connected to the fluid of the accommodating cavity.

[0017] Optionally, the battery module includes a plurality of batteries arranged in a stack, and a coolant flow channel for allowing coolant to flow is provided between two adjacent batteries.

[0018] Optionally, the thermal management module also includes: a heat exchange tube, which is arranged in the accommodating cavity and fixedly connected to the top wall of the accommodating cavity, the heat exchange tube fluid is connected between the liquid inlet pipeline and the accommodating cavity, a water tank, which is arranged at the bottom of the accommodating cavity and is used to collect the coolant condensed on the surface of the heat exchange tube, the liquid outlet pipeline is connected to the water tank fluid, and a circulation power device is used to pump the coolant in the liquid inlet pipeline to the heat exchange tube.

[0019] Through the above technical solution, the battery housing provided by the present disclosure is provided with a liquid limiting device. When the battery module contained in the battery housing has a thermal runaway, the liquid limiting device can be in a first state to block between the battery module and at least part of the side wall of the accommodating cavity, thereby enclosing a liquid injection space that surrounds the battery module. After the coolant is injected into the liquid injection space, its liquid level can rise rapidly to immerse the battery module. Compared with the case where no liquid limiting device is provided in the battery housing, the volume of coolant required to immerse the battery module becomes smaller, the cooling cost is reduced, and the liquid level rises faster, the time required to immerse the battery module is shortened, and the cooling efficiency is improved. The energy storage system provided by the present disclosure has the same technical effect as the battery housing in the above technical solution. In order to avoid unnecessary repetition, it will not be repeated here.

[0020] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic structural diagram of a battery housing in the first embodiment of the present disclosure, wherein the liquid limiting device is in the second state; Figure 2 is a schematic structural diagram of a battery housing in the first embodiment of the present disclosure, wherein the liquid limiting device is in a first state; Figure 3 is a schematic structural diagram of a liquid limiting device in a first embodiment of the present disclosure, wherein the liquid limiting device is in a second state; Figure 4 is a structural schematic diagram of a liquid limiting device in a second embodiment of the present disclosure, wherein the liquid limiting device is in a first state; Figure 5 is a schematic structural diagram of a liquid limiting device in a third embodiment of the present disclosure, wherein the liquid limiting device is in a first state; Figure 6 is a structural schematic diagram of a liquid limiting device in a fourth embodiment of the present disclosure, wherein the liquid limiting device is in a first state; Figure 7 is a structural schematic diagram of the cooperation between the liquid limiting device and the battery housing in the fifth embodiment of the present disclosure, wherein the liquid limiting device is in a first state; Figure 8 is a structural schematic diagram of a liquid limiting device in a sixth embodiment of the present disclosure, wherein the liquid limiting device is in a first state; Fig. 9 is a top perspective view of a battery housing in a seventh embodiment of the present disclosure, wherein the liquid limiting device is in a second state; Fig.10 is a top perspective view of a battery housing in a seventh embodiment of the present disclosure, wherein the liquid limiting device is in a first state; Fig.11 It is a schematic diagram of the connection between the thermal management module and the battery housing in a specific embodiment of the present disclosure.

[0022] Description of Reference Numerals 1-shell, 10-base, 11-accommodation chamber, 2-battery module, 20-battery, 3- thermal management module, 31- liquid inlet pipeline, 32- liquid outlet pipeline, 33- heat exchange tube, 34- water tank, 35- circulation power device, 4-liquid limiting device, 40-expandable structure, 41-bag body, 411-bottom, 412-wall, 413-transverse reinforcement ring, 414-pull wire, 42-second magnet, 43-fourth magnet, 44-third magnet, 45-first magnet. DETAILED DESCRIPTION

[0023] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0024] In the present disclosure, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the battery housing in the normal first state, and "inside" and "outside" refer to the inside and outside relative to the contour of the corresponding component itself. The terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0025] According to a specific embodiment of the present disclosure, a battery housing is provided, referring to Figures 1 to 11As shown, the battery shell may include a shell 1 and a liquid limiting device 4, wherein the shell 1 may include a accommodating chamber 11, the accommodating chamber 11 is suitable for accommodating the battery module 2, the accommodating chamber 11 may be provided with a liquid inlet and a liquid outlet, the liquid inlet is suitable for introducing the coolant into the accommodating chamber 11, and the liquid outlet is suitable for discharging the coolant in the accommodating chamber 11, the liquid limiting device 4 may be arranged in the accommodating chamber 11, and has a first state and the following second state, in the first state, the liquid limiting device 4 may be arranged between the battery module 2 and at least part of the side wall of the accommodating chamber 11, between the liquid limiting device 4 and part of the inner wall of the accommodating chamber 11, or the liquid limiting device 4 itself can surround and form a liquid injection space enclosing the battery module 2, and the liquid injection space is used to inject coolant to immerse the battery module 2.

[0026] It should be noted here that the inner wall of the accommodating chamber 11 includes a top wall and a bottom wall extending roughly in the horizontal direction and a side wall extending roughly in the vertical direction. For example, when the accommodating chamber 11 is in the shape of a rectangular parallelepiped, the accommodating chamber 11 can have a top wall, a bottom wall and four side walls. When the accommodating chamber 11 is in the shape of a cylinder, the accommodating chamber 11 can have a top wall, a bottom wall and a circular side wall formed by the circumferential surface of the cylinder.

[0027] That is to say, in the first state of the liquid limiting device 4, when the liquid limiting device 4 is blocked between part of the side wall of the accommodating chamber 11 and the battery module 2, the liquid limiting device 4 can surround the bottom wall of the accommodating chamber 11 and other unblocked side walls to form a liquid injection space enclosing the battery module 2 therein. In this case, the liquid limiting device 4 and part of the inner wall of the accommodating chamber 11 form a liquid injection space, and reference can be made to the seventh embodiment described below; when the liquid limiting device 4 is blocked between all the side walls of the accommodating chamber 11 and the battery module 2, the liquid limiting device 4 can surround the bottom wall of the accommodating chamber 11 and other unblocked side walls to form a liquid injection space enclosing the battery module 2. The positioning device 4 circumferentially surrounds the battery module 2, and the liquid limiting device 4 and the bottom wall of the accommodating chamber 11 surround and form a liquid injection space that encloses the battery module 2. In this case, the liquid limiting device 4 and part of the inner wall of the accommodating chamber 11 form a liquid injection space, and the fifth and sixth embodiments described below may be referred to. When the liquid limiting device 4 additionally has the bottom 411 described below, the liquid limiting device 4 itself surrounds and forms a liquid injection space that encloses the battery module 2, and the first to fourth embodiments described below may be referred to.

[0028] Through the above technical scheme, a liquid limiting device 4 is provided in the battery shell provided by the present invention. When the battery module 2 accommodated in the battery shell occurs thermal runaway, the liquid limiting device 4 can be in a first state to block between the battery module 2 and at least part of the side wall of the accommodating cavity 11, thereby enclosing a liquid injection space that surrounds the battery module 2. After the coolant is injected into the liquid injection space, its liquid level can rise rapidly to immerse the battery module 2. Compared with the case where no liquid limiting device 4 is provided in the battery shell, the volume of coolant required to immerse the battery module 2 becomes smaller, the cooling cost is reduced, and the liquid level rises faster, the time required to immerse the battery module 2 is shortened, and the cooling efficiency is improved.

[0029] As a specific embodiment of the present disclosure, in the first state of the liquid limiting device 4, the liquid limiting device 4 is shielded between all the side walls of the accommodating cavity 11 and the battery module 2. Figures 1 to 8 As shown, the accommodating chamber 11 may include a first chamber wall and a second chamber wall that are arranged opposite to each other, and the liquid limiting device 4 may include a bag body 41, which may be sealed and connected to the first chamber wall, and an end of the bag body 41 that faces the second chamber wall may be provided with an opening for avoiding the battery module 2, and the bag body 41 may be able to stretch between the first chamber wall and the second chamber wall to cover the outside of the battery module 2. Specifically, the liquid limiting device 4 may be configured as follows: in the second state, the bag body 41 may be contracted and stored on the first chamber wall, so that a sufficient electrical gap is maintained between the battery module 2 and the inner wall of the accommodating chamber 11 to ensure the working reliability of the battery module 2 without affecting the normal operation of the battery module 2; in the first state, the bag body 41 may stretch toward the second chamber wall to form a liquid injection space around the first chamber wall.

[0030] In the specific embodiment of the present disclosure, one of the first cavity wall and the second cavity wall is the bottom wall of the accommodating cavity 11, and the other is the top wall of the accommodating cavity 11. In order to facilitate the arrangement of the water tank 34 described below in the battery housing, the bottom wall of the accommodating cavity 11 can be a base 10 supported above the water tank 34.

[0031] refer to Figures 1 to 6 As shown, when the first cavity wall is the bottom wall of the accommodating cavity 11 and the second cavity wall is the top wall of the accommodating cavity 11, the bag body 41 is arranged on the base 10 and can stretch upward in the vertical direction in the first state. The maximum extension height of the bag body 41 in the vertical direction is equal to or greater than the height of the battery module 2, so that the height of the liquid injection space is equal to or greater than the height of the battery module 2, thereby ensuring that the coolant in the liquid injection space can immerse the battery module 2.

[0032] refer to Figures 1 to 6As shown, the bag body 41 may include a bottom 411 placed on the base 10 and a wall portion 412 sealed with the bottom 411 to achieve relative sealing between the bag body 41 and the base 10. The wall portion 412 may be constructed as a multi-fold bellows structure to extend upward in the vertical direction and cover the outside of the battery module 2. In this case, the bag body 41 itself surrounds to form a liquid injection space. In addition, the bag body 41 may also only include the above-mentioned wall portion 412, and the bottom end of the wall portion 412 may be sealed with the base 10 to achieve relative sealing between the bag body 41 and the base 10. In this case, the bag body 41 and the bottom wall of the accommodating cavity 11 surround to form a liquid injection space.

[0033] The following describes an embodiment in which the bag body 41 is accommodated in the bottom wall of the accommodating chamber 11 in the second state and extends upward in the vertical direction in the first state.

[0034] First embodiment refer to Figures 1 to 3 As shown, in order to realize the upward extension of the bag body 41 in the vertical direction, the wall portion 412 of the bag body 41 can be inflated with gas or liquid to realize the extension in the vertical direction. Specifically, a flow channel for injecting gas or liquid can be provided in the wall portion 412 of the bag body 41, and the wall portion 412 can be extended in the vertical direction by injecting gas or liquid into the flow channel.

[0035] In order to reduce the expansion of the wall portion 412 in the horizontal direction, refer to Figure 3 As shown, a plurality of horizontally extending transverse reinforcement rings 413 may be provided on the outer peripheral surface of the bag body 41, and the plurality of transverse reinforcement rings 413 may be arranged at intervals in the vertical direction to reduce the deformation of the wall portion 412 in the horizontal direction when gas or liquid is injected into the flow channel, so that the injected gas or liquid can quickly drive the wall portion 412 to stretch in the vertical direction.

[0036] Second embodiment refer to Figure 4 As shown, in order to enable the bag body 41 to stretch upward in the vertical direction, a pull wire 414 may be provided at the top of the bag body 41, and a driving member (not shown) may be provided on the second cavity wall, which can drive the wall portion 412 to extend and retract in the vertical direction through the pull wire 414.

[0037] In addition, the bag body 41 can be retracted and retracted by providing a magnet on the outer peripheral surface of the bag body 41. Figures 5 to 7As shown, a plurality of fourth magnets 43 may be provided on the outer peripheral surface of the bag body 41, and the two magnetic poles of the fourth magnet 43 may be arranged along the stretching direction of the bag body 41. In the first state, the plurality of fourth magnets 43 may be arranged from one end of the bag body 41 to the other end of the bag body 41 at intervals along the stretching direction of the bag body 41. At least a portion of the plurality of fourth magnets 43 may be electromagnets, and the liquid limiting device 4 may be configured as follows: in the first state, the electromagnets are energized so that the magnetic pole arrangement of the electromagnets is opposite to the magnetic pole arrangement of the adjacent fourth magnets 43. That is, in the first state, a repulsive force is generated between the electromagnets and the adjacent fourth magnets 43 along the stretching direction of the bag body 41, so that the bag body 41 can stretch.

[0038] In order to prevent the bag body 41 from deviating from the predetermined stretching direction during the stretching process, a slider (not shown) may be provided on the outer peripheral surface of the bag body 41, and a slide rail (not shown) extending along the stretching direction of the bag body 41 may also be provided in the accommodating cavity 11, and the slider may be slidably arranged on the slide rail.

[0039] The following describes an embodiment in which the bag body 41 is accommodated in the bottom wall of the accommodating chamber 11 in the second state and is extended upward in the vertical direction by energizing the electromagnet in the first state.

[0040] Third embodiment refer to Figure 5 As shown, in order to enable the bag body 41 to stretch upward in the vertical direction, a plurality of fourth magnets 43 may be provided on the wall portion 412 , and the plurality of fourth magnets 43 may all be electromagnets.

[0041] In the first state, the multiple electromagnets are energized so that the magnetic poles of the electromagnets are arranged in the vertical direction, and the magnetic poles of two adjacent electromagnets are arranged in opposite directions, so that the two adjacent electromagnets repel each other, thereby driving the wall portion 412 to extend upward in the vertical direction. In addition, the multiple electromagnets can be arranged from the top of the wall portion 412 to the bottom of the wall portion 412 in an extended state of the wall portion 412, thereby ensuring that after the multiple electromagnets are energized, the wall portion 412 can be fully extended under the mutual repulsion of the two adjacent electromagnets.

[0042] Fourth embodiment refer to Figure 6 As shown, in order to enable the bag body 41 to stretch upward in the vertical direction, a plurality of fourth magnets 43 may be arranged on the wall portion 412, a portion of the plurality of fourth magnets 43 may be electromagnets, another portion of the plurality of fourth magnets 43 may be permanent magnets, the magnetic poles of the permanent magnets are arranged in the same manner, and an electromagnet is arranged between two adjacent permanent magnets.

[0043] In the first state, the multiple electromagnets are energized so that the magnetic poles of the electromagnets are arranged in the vertical direction, and the magnetic poles of each electromagnet are arranged opposite to those of the adjacent fourth magnets 43, so that each electromagnet and the adjacent fourth magnets 43 repel each other, thereby driving the wall portion 412 to extend upward in the vertical direction. In addition, the multiple fourth magnets 43 can be arranged from the top of the wall portion 412 to the bottom of the wall portion 412 at intervals in the extended state of the wall portion 412, thereby ensuring that after the electromagnets are energized, the wall portion 412 can be fully extended under the mutual repulsion of two adjacent fourth magnets 43.

[0044] refer to Figure 7 and Figure 8 As shown, when the first cavity wall is the top wall of the accommodating cavity 11 and the second cavity wall is the bottom wall of the accommodating cavity 11, the bag body 41 can extend in the vertical direction to be sealed and connected with the bottom wall of the accommodating cavity 11. The bag body 41 may include a wall portion 412, which may be configured as a multi-fold bellows structure, the top end of the wall portion 412 may be fixedly connected to the top wall of the accommodating cavity 11, and the bottom end of the wall portion 412 may extend downward in the vertical direction to be sealed and connected with the bottom wall of the accommodating cavity 11. At this time, the bag body 41 and the bottom wall of the accommodating cavity 11 surround and form a liquid injection space enclosing the battery module 2 therein, and the height of the liquid injection space is equal to the distance between the top wall and the bottom wall of the accommodating cavity 11.

[0045] The following describes an embodiment in which the bag body 41 is received on the top wall of the accommodating cavity 11 in the second state and extends downward in the vertical direction in the first state.

[0046] Fifth embodiment In this embodiment, the bag body 41 is extended downward in the vertical direction in the first state by energizing the electromagnet.

[0047] Specifically, refer to Figure 7 As shown, a plurality of fourth magnets 43 may be disposed on the wall portion 412, a portion of the plurality of fourth magnets 43 may be electromagnets, another portion of the plurality of fourth magnets 43 may be permanent magnets, the magnetic poles of the permanent magnets are arranged in the same manner, and an electromagnet is disposed between two adjacent permanent magnets.

[0048] In order to enable the bag body 41 to be received in the top wall of the accommodating chamber 11 in the second state, the fourth magnet 43 at the bottom end of the wall portion 412 may be a permanent magnet. In the second state of the bag body 41, i.e., when the electromagnet is not powered, the wall portion 412 may be adsorbed on the top wall of the accommodating chamber 11 by the permanent magnet disposed at the bottom end of the wall portion 412, so that the wall portion 412 can be received in the top wall of the accommodating chamber 11. In addition, the iron core in the electromagnet that is not powered can be attracted to the adjacent permanent magnet, so that wrinkles are formed on the wall portion 412 and the bag body 412 is received in the top wall of the accommodating chamber 11.

[0049] In the first state, the multiple electromagnets are energized so that the magnetic poles of the electromagnets are arranged in the vertical direction, and the magnetic poles of each electromagnet are arranged opposite to those of the adjacent fourth magnets 43, so that each electromagnet and the adjacent fourth magnets 43 repel each other, thereby driving the wall portion 412 to extend downward in the vertical direction. In addition, the multiple fourth magnets 43 can be arranged from the top of the wall portion 412 to the bottom of the wall portion 412 at intervals in the extended state of the wall portion 412, thereby ensuring that after the electromagnets are energized, the wall portion 412 can be fully extended under the mutual repulsion of two adjacent fourth magnets 43.

[0050] Sixth embodiment This embodiment is a simplification of the fifth embodiment.

[0051] In order to enable the bag body 41 to be accommodated in the top wall of the accommodating cavity 11 in the second state, Figure 8 As shown, a second magnet 42 may be provided on the top wall of the accommodating cavity 11, and a first magnet 45 may be provided at the bottom end of the wall portion 412, and the two magnetic poles of the first magnet 45 are arranged in the vertical direction. In the second state of the bag body 41, the second magnet 42 and the first magnet 45 are attracted to each other, so that the bag body 41 can be accommodated in the top wall of the accommodating cavity 11. In the first state of the bag body 41, the second magnet 42 and the first magnet 45 repel each other, so that the wall portion 412 can extend vertically downward under the mutual repulsion between the second magnet 42 and the first magnet 45 and the gravity of the first magnet 45.

[0052] In order to strengthen the sealing connection between the wall portion 412 and the base 10, a plurality of first magnets 45 may be circumferentially arranged at the bottom end of the wall portion 412, and a plurality of third magnets 44 may be correspondingly arranged on the base 10. In the first state of the bag body 41, the third magnets 44 and the first magnets 45 are attracted to each other, and the wall portion 412 can also extend downward under the mutual attraction between the third magnets 44 and the first magnets 45 until the third magnets 44 and the first magnets 45 are attracted to each other.

[0053] In this embodiment, the second magnet 42 and the third magnet 44 may both be electromagnets, and the magnetic pole arrangement of the second magnet 42 and the third magnet 44 may be changed by changing the direction of the current.

[0054] As another specific implementation of the present disclosure, in the first state of the liquid limiting device 4 , the liquid limiting device 4 is blocked between at least a portion of the side wall of the accommodating cavity 11 and the battery module 2 .

[0055] Seventh embodiment refer to Fig. 9 and Fig.10As shown, the liquid limiting device 4 may include an inflatable structure 40. In a specific embodiment of the present disclosure, the inflatable structure 40 may be an air bag or a water bag. The inflatable structure 40 may be bonded to at least one side wall of the accommodating cavity 11. When the inflatable structure 40 is inflated, it can occupy a part of the space in the accommodating cavity 11, thereby reducing the volume of the coolant that can be accommodated in the accommodating cavity 11. The liquid limiting device 4 may be configured as follows: in the second state, the inflatable structure 40 is in an unexpanded state and is tightly attached to the side wall of the accommodating cavity 11; in the first state, the inflatable structure 40 may expand toward the battery module 2 to form a liquid injection space around the inner wall of the accommodating cavity 11.

[0056] When the inflatable structure 40 is bonded to all side walls of the accommodating cavity 11 , in the first state, the inflatable structure 40 and the bottom wall of the accommodating cavity 11 surround and form a liquid injection space.

[0057] When the expandable structure 40 is bonded to a portion of the side walls of the accommodating cavity 11 , in the first state, the expandable structure 40 , the bottom wall of the accommodating cavity 11 , and the side walls to which the expandable structure 40 is not bonded form a liquid injection space.

[0058] In order to reduce the expansion of the inflatable structure 40 in the horizontal direction, the inflatable structure 40 may be provided with a transverse limiting belt and / or a longitudinal limiting belt.

[0059] Based on the above technical solution, the present disclosure also provides an energy storage system, referring to Fig.11 As shown, the energy storage system may include the battery housing, the battery module 2 and the thermal management module 3 in the above technical solution. The battery module 2 may be accommodated in the accommodating chamber 11, and the thermal management module 3 may include a liquid inlet pipeline 31 and a liquid outlet pipeline 32 in fluid communication with the accommodating chamber 11. Specifically, the liquid inlet pipeline 31 may be in fluid communication with the liquid inlet of the accommodating chamber 11 to inject cooling liquid into the accommodating chamber 11, and the liquid outlet pipeline 32 may be in fluid communication with the liquid outlet of the accommodating chamber 11 to discharge the cooling liquid in the accommodating chamber 11.

[0060] Through the above technical solution, the energy storage system provided by the present disclosure has the same technical effect as the battery housing in the above technical solution, and in order to avoid unnecessary repetition, it will not be described here.

[0061] In the specific embodiments of the present disclosure, refer to Fig.11As shown, the battery module 2 may include a plurality of batteries 20 stacked and arranged in a vertical direction, and a coolant flow channel for the coolant to flow through may be provided between two adjacent batteries 20. When the coolant immerses the battery module 2, the coolant can also flow into between the two adjacent batteries 20 through the coolant flow channel, thereby increasing the contact area between the battery module 2 and the coolant, thereby improving the cooling effect of the coolant. Specifically, an elastic gasket (not shown) may be provided between two adjacent batteries 20, and a gap may be formed between the two adjacent batteries 20 through the elastic gasket, and the gap may be used as the above-mentioned coolant flow channel.

[0062] In the specific embodiments of the present disclosure, refer to Fig.11 As shown, the thermal management module 3 may also include a heat exchange tube 33, a water tank 34 and a circulation power device 35, wherein the heat exchange tube 33 may be arranged in the accommodating chamber 11 and fixedly connected to the top wall of the accommodating chamber 11, the heat exchange tube 33 may be fluidly connected between the liquid inlet pipeline 31 and the accommodating chamber 11, the circulation power device 35 is used to pump the coolant in the liquid inlet pipeline 31 to the heat exchange tube 33, the water tank 34 may be arranged at the bottom of the accommodating chamber 11, and the liquid outlet pipeline 32 may be fluidly connected to the water tank 34. The following process will occur in the accommodating chamber 11: the coolant entering the accommodating chamber 11 will evaporate and rise after contacting the high-temperature battery module 2, and will condense when encountering the heat exchange tube 33 with a lower temperature during the rising process, and the coolant condensed on the surface of the heat exchange tube 33 will drip downward and gather in the water tank 34, and finally be discharged through the liquid outlet pipeline 32.

[0063] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0064] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0065] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery housing, characterized in that: include: The housing comprises a housing chamber, wherein the housing chamber is suitable for accommodating the battery module; as well as A liquid limiting device is arranged in the accommodating cavity. In a first state, the liquid limiting device is arranged between the battery module and at least a portion of the side wall of the accommodating cavity. A liquid injection space can be formed between the liquid limiting device and a portion of the inner wall of the accommodating cavity or the liquid limiting device itself. The liquid injection space encloses the battery module therein, and the liquid injection space is used to inject cooling liquid.

2. The battery housing according to claim 1, characterized in that: The accommodating cavity comprises a first cavity wall and a second cavity wall arranged opposite to each other, the liquid limiting device comprises a bag body, the bag body is sealedly connected to the first cavity wall, an end of the bag body facing the second cavity wall is provided with an opening for avoiding the battery module, and the bag body is suitable for expanding and contracting between the first cavity wall and the second cavity wall. In the second state, the bag body is shrunk and stored on the first cavity wall; In the first state, the bag body extends toward the second cavity wall to form the liquid injection space.

3. The battery housing according to claim 2, characterized in that: The first cavity wall is the bottom wall of the accommodating cavity, the second cavity wall is the top wall of the accommodating cavity, and the maximum extended height of the bag body along the vertical direction is equal to or greater than the height of the battery module.

4. The battery housing according to claim 2 or 3, characterized in that: The bag body is provided with a flow channel for injecting gas or liquid.

5. The battery casing according to claim 4, characterized in that: The outer peripheral surface of the bag body is provided with a plurality of transverse reinforcement rings extending in the circumferential direction, and the plurality of transverse reinforcement rings are arranged at intervals in the vertical direction.

6. The battery housing according to claim 2 or 3, characterized in that: The first cavity wall is the bottom wall of the accommodating cavity, and the second cavity wall is the top wall of the accommodating cavity. A pull line is arranged at the top end of the bag body, and a driving member is arranged on the second cavity wall. The driving member can drive the bag body to extend and retract in a vertical direction through the pull line.

7. The battery case according to claim 2, characterized in that: The first cavity wall is the top wall of the accommodating cavity, the second cavity wall is the bottom wall of the accommodating cavity, and the bag body can extend in a vertical direction to be sealed and connected with the second cavity wall.

8. The battery casing according to claim 7, characterized in that: The first cavity wall is provided with a second magnet, the second cavity wall is provided with a third magnet, the bottom end of the bag body is provided with a first magnet, and the two magnetic poles of the first magnet are arranged in a vertical direction. In the second state, the second magnet is attracted to the first magnet; in the first state, the second magnet is repelled from the first magnet, and the third magnet is attracted to the first magnet.

9. The battery casing according to claim 2, characterized in that: A sliding block is arranged on the outer peripheral surface of the bag body, and a sliding rail extending along the stretching direction of the bag body is also arranged in the accommodating cavity, and the sliding block is slidably arranged on the sliding rail.

10. The battery housing according to claim 1, characterized in that: The liquid limiting device comprises an expandable structure, and the expandable structure is arranged on at least one side wall of the accommodating cavity. In the first state, the inflatable structure inflates toward the battery module; in the second state, the inflatable structure is in an uninflated state and is closely attached to the side wall of the accommodating cavity.

11. The battery housing according to claim 10, characterized in that: The expandable structure is provided with a transverse limiting belt and / or a longitudinal limiting belt.

12. An energy storage system, characterized in that: include: The battery case according to any one of claims 1 to 11, A battery module is contained in the housing cavity, and The thermal management module comprises a liquid inlet pipeline and a liquid outlet pipeline which are in fluid communication with the accommodating cavity.

13. The energy storage system according to claim 12, characterized in that: The battery module includes a plurality of batteries arranged in a stacked manner, and a coolant flow channel for allowing coolant to flow is provided between two adjacent batteries.

14. The energy storage system according to claim 12, characterized in that: The thermal management module further comprises: A heat exchange tube is arranged in the accommodating cavity and fixedly connected to the top wall of the accommodating cavity. The heat exchange tube is connected between the liquid inlet pipeline and the accommodating cavity. a water tank, arranged at the bottom of the accommodating cavity, for collecting the coolant condensed on the surface of the heat exchange tube, the liquid outlet pipeline being in fluid communication with the water tank, and A circulation power device is used to pump the coolant in the liquid inlet pipeline to the heat exchange tube.

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