Battery pack and power device with same

Abstract

The utility model provides a battery pack and a power device with the same, the battery pack comprises a shell, an installation cavity is formed in the shell, the installation cavity is filled with immersion liquid, the shell comprises a cover plate, and an exhaust hole is formed in the cover plate; the number of the single batteries is multiple, the multiple single batteries are arranged in the thickness direction of the single batteries and located in the immersion liquid, and each single battery is provided with a first anti-explosion valve; the sealing element is arranged on the upper side of the battery monomer, a through hole is formed in the sealing element, one side of the through hole is communicated with a valve port of the first anti-explosion valve, and the other side of the through hole is communicated with the exhaust hole. According to the battery pack disclosed by the utility model, the sealing element is arranged and can isolate the immersion liquid from the first anti-explosion valve, so that the immersion liquid can be effectively prevented from being sprayed out along with high-temperature gas when the battery monomers are in thermal runaway and release the high-temperature gas, and the influence of thermal runaway on the thermal management performance of the immersion liquid can be reduced; and the use safety of the battery pack can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power device manufacturing, in particular to a battery pack and a power device having the same. Background Art

[0002] In order to prevent thermal runaway of the battery cells in the battery pack in the existing solution, the battery pack is usually filled with immersion liquid for thermal management of the battery cells. However, when the battery cells release high-temperature gases due to thermal runaway, the immersion liquid will be sprayed out together with the high-temperature gases, which will affect the thermal management effect of the immersion liquid and further affect the safety of the battery pack. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery pack, which can improve the safety of the battery pack.

[0004] A battery pack according to an embodiment of the utility model includes: a shell, a mounting cavity is formed in the shell, the mounting cavity is filled with immersion liquid, the shell includes a cover plate, and an exhaust hole is formed on the cover plate; a battery cell, the battery cell includes a plurality of battery cells, the plurality of battery cells are arranged along the thickness direction of the battery cell and are located in the immersion liquid, and each of the battery cells is provided with a first explosion-proof valve; a sealing member, the sealing member is provided on the upper side of the battery cell, the sealing member is formed with a through hole, one side of the through hole is connected to the valve port of the first explosion-proof valve, and the other side of the through hole is connected to the exhaust hole.

[0005] According to the battery pack of the present invention, a seal is provided, which can isolate the immersion liquid from the first explosion-proof valve. When the battery cell releases high-temperature gas due to thermal runaway, the seal can effectively prevent the immersion liquid from spraying out with the high-temperature gas, thereby reducing the impact of thermal runaway on the thermal management performance of the immersion liquid, and further effectively improving the safety of the battery pack.

[0006] According to some embodiments of the utility model, the sealing member includes: a support body, which extends in a ring shape around the plurality of battery cells; a sealing body, which extends along the arrangement direction of the battery cells and whose two ends are connected to the support body, and the through hole is formed on the sealing body, and the through hole is arranged one-to-one with the first explosion-proof valve and is connected to the first explosion-proof valve.

[0007] According to some optional embodiments of the utility model, the shell includes: a box body, the interior of the box body forms an installation cavity, the upper part of the box body is opened to form an open opening, the open opening is connected to the box body, and the support body is arranged at the open position and supported on the upper end of the box body.

[0008] According to some optional embodiments of the utility model, liquid cooling channels are formed on both sides of the battery cell, the liquid cooling channels extend along the length direction of the battery cell, the immersion liquid flows in the liquid cooling channels, and the flow cross-section of the liquid cooling channels gradually increases and then gradually decreases.

[0009] According to some optional embodiments of the utility model, the battery pack includes: an elastic member, the number of the elastic members is two, the liquid cooling channel is defined between the two elastic members, at least one partition is provided in the middle of the elastic member, the partition extends along the flow direction of the liquid cooling channel, the partition is provided in the liquid cooling channel and divides the liquid cooling channel into multiple parts.

[0010] According to some optional embodiments of the present invention, the box body includes a first side panel and a second side panel, the first side panel and the second side panel are arranged on both sides of the liquid cooling channel, a first cavity is formed on one of the first side panel and a second cavity is formed on the other, one end of the liquid cooling channel is connected to the first cavity, and the other end of the liquid cooling channel is connected to the second cavity.

[0011] According to some optional embodiments of the utility model, a first cavity is formed on the first side plate, a second cavity is formed on the second side plate, a liquid inlet is formed on the first side plate, the liquid inlet is connected to the first cavity, and a liquid outlet is formed on the second side plate, the liquid outlet is connected to the second cavity.

[0012] According to some embodiments of the utility model, a protective component is provided above the cover plate, the protective component is connected to the exhaust hole, and the protective component includes: a baffle, the baffle cover is arranged at the position of the exhaust hole; a protective member, the protective member cover is arranged on the baffle, the protective member is connected to the cover plate, and the protective member is provided with a plurality of second explosion-proof valves.

[0013] According to some embodiments of the present invention, the battery pack includes: a bus bar, which is arranged at the bottom of the installation cavity and is electrically connected to the plurality of battery cells.

[0014] The power device according to the embodiment of the second aspect of the utility model includes the battery pack according to the first aspect of the utility model.

[0015] According to the power device of the utility model, by setting the battery pack of the first embodiment mentioned above, a seal is set, which can isolate the immersion liquid from the first explosion-proof valve. When the battery cell releases high-temperature gas due to thermal runaway, the immersion liquid can be effectively prevented from being sprayed out with the high-temperature gas, thereby reducing the impact of thermal runaway on the thermal management performance of the immersion liquid, and further effectively improving the safety of the battery pack.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded view of a battery pack according to an embodiment of the first aspect of the utility model;

[0018] Figure 2 yes Figure 1 A schematic diagram of a first side plate and a second side plate of a box body shown in ;

[0019] Figure 3 yes Figure 1 Schematic diagram of the battery cell, elastomer and separator shown in FIG.

[0020] Reference numerals:

[0021] 100. Battery pack;

[0022] 10. Shell; 11. Box body; 111. First side plate; 1111. Liquid inlet; 112. Second side plate; 1121. Liquid outlet; 1122. Second opening; 12. Cover plate; 121. Exhaust hole; 13. Bottom plate;

[0023] 20. Battery cell; 21. First explosion-proof valve;

[0024] 30. sealing member; 31. supporting body; 32. sealing body; 321. through hole;

[0025] 40. elastic member; 41. liquid cooling channel;

[0026] 50. Partition;

[0027] 60. Protection assembly; 61. Baffle; 62. Protection member; 621. Second explosion-proof valve;

[0028] 70. Bus. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] Please refer to the following Figure 1-3 A battery pack 100 according to an embodiment of the present invention is described.

[0031] Reference Figure 1 , Figure 2 and Figure 3 According to an embodiment of the present invention, a battery pack 100 includes a housing 10 , a battery cell 20 and a sealing member 30 .

[0032] Specifically, a mounting cavity is formed in the housing 10, and the mounting cavity is filled with an immersion liquid. The housing 10 includes a cover plate 12, and an exhaust hole 121 is formed on the cover plate 12; the battery cell 20 includes a plurality of battery cells, that is, the battery cells 20 include two, three, or four or more battery cells 20 along the thickness direction of the battery cell 20 (such as Figure 1 The battery cells 20 are arranged in the left and right directions as shown in the figure, and are located in the immersion liquid. Each battery cell 20 is provided with a first explosion-proof valve 21; a sealing member 30 is provided on the upper side of the battery cell 20 (as shown in the figure). Figure 1 The sealing member 30 is formed with a through hole 321, and one side of the through hole 321 (such as Figure 1 The lower side of the through hole 321 shown in FIG. 1 is connected to the valve port of the first explosion-proof valve 21, and the other side of the through hole 321 (as shown in FIG. Figure 1 The upper side of the through hole 321 shown is connected to the exhaust hole 121. The immersion liquid is used to cool the battery cell 20. When the battery cell 20 is in thermal runaway, it can effectively prevent the thermal runaway of the battery cell 20 from further aggravating, thereby ensuring the safety of the battery pack 100.

[0033] For example, Figure 1 , Figure 2 and Figure 3 As shown, the housing 10 forms a mounting cavity inside, the cover plate 12 is disposed on the upper side of the housing 10, the exhaust hole 121 penetrates the cover plate 12 in the up-down direction, the battery cells 20 are arranged at intervals in the left-right direction, the upper side of the battery cells 20 is provided with a first explosion-proof valve 21, the immersion liquid is disposed in the mounting cavity, the immersion liquid immerses the battery cells 20, the seal 30 is disposed between the battery cells 20 and the cover plate 12, and the through hole 321 of the seal 30 corresponds to the first explosion-proof valve 21 and the exhaust hole 121 in the up-down direction, and the seal 30 isolates the immersion liquid from the explosion-proof valve. Preferably, the housing 10 is an aluminum profile, which can ensure the strength of the housing 10 and prevent damage to the housing 10.

[0034] When assembling the battery pack 100, first arrange multiple battery cells 20 in the front-to-back direction, then place the battery cells 20 in the installation cavity, then fill the installation cavity with immersion liquid, then place the seal 30 on the upper side of the battery cells 20, and finally cover the cover plate 12 on the shell 10. At this time, the battery pack 100 is assembled.

[0035] The battery pack 100 of the present invention is provided with a seal 30, which isolates the immersion liquid from the first explosion-proof valve 21. When the battery cell 20 thermally runs away, the first explosion-proof valve 21 releases high-temperature gas, and the high-temperature gas is discharged from the battery pack 100 through the through hole 321 and the exhaust hole 121 in sequence, while the immersion liquid is isolated by the seal 30 and the first explosion-proof valve 21, and the immersion liquid will not be sprayed out of the battery pack 100 with the high-temperature gas. In this way, even if the battery cell 20 thermally runs away, the normal circulation of the immersion liquid can still be guaranteed, thereby reducing the influence of the thermal runaway on the thermal management performance of the immersion liquid, playing the effect of suppressing heat spread, and further avoiding the thermal runaway of the battery cell 20. Further aggravation, can effectively improve the safety of the battery pack 100.

[0036] According to the battery pack 100 of the embodiment of the utility model, a seal 30 is provided, which can isolate the immersion liquid from the first explosion-proof valve 21. When the battery cell 20 releases high-temperature gas due to thermal runaway, the immersion liquid can be effectively prevented from being sprayed out with the high-temperature gas, thereby reducing the impact of thermal runaway on the thermal management performance of the immersion liquid, and further effectively improving the safety of the battery pack 100.

[0037] According to some embodiments of the present invention, referring to Figure 1 The sealing member 30 includes: a support body 31 and a sealing body 32. The support body 31 extends in a ring shape around the plurality of battery cells 20; the sealing body 32 extends in a direction along which the battery cells 20 are arranged (eg Figure 1 The left and right directions shown in FIG. 1 extend and the two ends of the sealing body 32 (such as Figure 1 The left and right ends of the sealing body 32 shown are connected to the support body 31, and a through hole 321 is formed on the sealing body 32. The through hole 321 is arranged in a one-to-one correspondence with the first explosion-proof valve 21 and is connected to the first explosion-proof valve 21.

[0038] In this way, the support body 31 can support the seal 30 on the battery cell 20, thereby effectively preventing the seal 30 from falling off the battery cell 20. At the same time, the support body 31 is surrounded in a ring shape, which can facilitate the matching installation of the seal 30 and the battery cell 20. In addition, the seal body 32 can isolate the immersion liquid from the first explosion-proof valve 21, thereby ensuring the sealing effect of the seal 30. In addition, the number of through holes 321 corresponds to the number of first explosion-proof valves 21, which can ensure that each first explosion-proof valve 21 can be discharged from the corresponding through hole 321, thereby ensuring that the first explosion-proof valve 21 can release high-temperature gas normally.

[0039] For example, Figure 1As shown, the support body 31 surrounds the battery cell 20 to form a rectangular frame, the sealing body 32 is extended in the left-right direction, the sealing body 32 is arranged in the middle position of the support body 31 in the front-back direction, the left and right ends of the sealing body 32 are connected to the support body 31, and a plurality of through holes 321 are provided on the sealing body 32, the through holes 321 are arranged in sequence in the left-right direction, and the through holes 321 are aligned with the first explosion-proof valve 21 in the up-down direction.

[0040] According to some optional embodiments of the present invention, referring to Figure 1 The housing 10 includes: a box body 11, the interior of the box body 11 forms a mounting cavity, the upper portion of the box body 11 (such as Figure 1 The upper part of the box body 11 shown in FIG. 1 is opened to form an open opening, which is communicated with the box body 11. The support body 31 is arranged at the open position and supported on the upper end of the box body 11 (as shown in FIG. 1 ). Figure 1 The upper end of the box body 11 shown).

[0041] In this way, the upper side of the box body 11 is open, which can facilitate the installation of the battery cell 20 into the installation cavity, thereby improving the assembly efficiency. The support body 31 is supported on the upper end of the box body 11, which can facilitate the setting of the seal 30. At the same time, the supporting effect of the support body 31 on the seal 30 can also be ensured.

[0042] According to some optional embodiments of the present invention, referring to Figure 1 and Figure 3 Liquid cooling channels 41 are formed on both sides of the battery cell 20. The liquid cooling channels 41 extend along the length direction of the battery cell 20 (eg Figure 1 The liquid-cooling channel 41 extends in the front-to-back direction (as shown), and an immersion liquid flows in the liquid-cooling channel 41. The flow cross-section of the liquid-cooling channel 41 first gradually increases and then gradually decreases.

[0043] In this way, the liquid cooling channel 41 provides a circulation channel for the immersion liquid, facilitating the flow of the immersion liquid, and at the same time, ensuring that the immersion liquid can immerse the battery cell 20. Furthermore, since the center of the battery cell 20 is more heated, the flow cross-section of the liquid cooling channel 41 at the center is the largest, so that the immersion liquid in the liquid cooling channel 41 at the middle position is the largest, so that the cooling effect of the immersion liquid on the battery cell 20 can be ensured, thereby effectively preventing the battery cell 20 from thermal runaway. In addition, liquid cooling channels 41 are provided on both sides of the battery cell 20, and the immersion liquid can cool both sides of the battery cell 20, thereby ensuring the thermal management effect of the immersion liquid on the battery cell 20.

[0044] According to some optional embodiments of the present invention, referring to Figure 1 and Figure 3The battery pack 100 includes: an elastic member 40, the number of the elastic members 40 is two, a liquid cooling channel 41 is defined between the two elastic members 40, at least one partition 50 is provided in the middle of the elastic member 40, that is, one, two or three or more partitions 50 are provided in the middle of the elastic member 40, the partition 50 extends along the flow direction of the liquid cooling channel 41, and the partition 50 is provided in the liquid cooling channel 41 and divides the liquid cooling channel 41 into multiple.

[0045] In this way, a liquid cooling channel 41 is defined between the elastic members 40, and there is no need to set up an additional liquid cooling channel 41, thereby reducing the processing steps and reducing the production cost. Furthermore, the partition 50 between the elastic members 40 can divide the liquid cooling channel 41 into multiple parts, which can make the distribution of the immersion liquid more uniform, thereby further ensuring the immersion effect of the immersion liquid on the battery cell 20.

[0046] For example, Figure 1 and Figure 3 As shown, the elastic member 40 is provided at both ends of the battery cell 20 in the up-down direction, and the two elastic members 40 define a liquid cooling channel 41 whose flow cross section first gradually increases and then gradually decreases, and the partition 50 extends linearly in the front-to-back direction, and two partitions 50 are provided, and the two partitions 50 are arranged at intervals in the up-to-down direction, and the partition 50 divides the liquid cooling channel 41 into three liquid cooling channels 41 extending in the front-to-back direction. Preferably, the elastic member 40 is MPP (polypropylene microporous foam new material) foam, which can reduce the weight of the elastic member 40 and the compression amount of the elastic member 40, thereby preventing the liquid cooling channel 41 from being deformed and blocked.

[0047] According to some optional embodiments of the present invention, referring to Figure 1 and Figure 2 The box body 11 includes a first side plate 111 and a second side plate 112, and the first side plate 111 and the second side plate 112 are arranged on both sides of the liquid cooling channel 41 (such as Figure 1 In the figure, the front and rear sides of the liquid-cooling channel 41 are shown, a first cavity is formed on one of the first side plate 111 and the second side plate 112, and a second cavity is formed on the other. That is to say, the first cavity is formed on the first side plate 111 and the second cavity is formed on the second side plate 112, or the first cavity is formed on the second side plate 112 and the second cavity is formed on the first side plate 111, one end of the liquid-cooling channel 41 is connected to the first cavity, and the other end of the liquid-cooling channel 41 is connected to the second cavity.

[0048] In this way, the first cavity and the second cavity can store immersion liquid, and the first cavity and the second cavity are connected with the liquid-cooling channel 41. When the immersion liquid in the liquid-cooling channel 41 is consumed, the immersion liquid in the first cavity and the second cavity can be replenished into the liquid-cooling channel 41, thereby ensuring the immersion liquid stock in the installation cavity, and further ensuring the thermal management effect of the immersion liquid on the battery cell 20. At the same time, the first cavity and the second cavity are arranged on both sides of the liquid-cooling channel 41, so that the immersion liquid can flow conveniently between the first cavity, the liquid-cooling channel 41 and the second cavity.

[0049] According to some embodiments of the present invention, referring to Figure 1 and Figure 3 A first cavity is formed on the first side plate 111, a second cavity is formed on the second side plate 112, a liquid inlet 1111 is formed on the first side plate 111, the liquid inlet 1111 is connected to the first cavity, and a liquid outlet 1121 is formed on the second side plate 112, the liquid outlet 1121 is connected to the second cavity.

[0050] In this way, the liquid inlet 1111 can replenish the immersion liquid into the first cavity, thereby replenishing the immersion liquid into the liquid cooling channel 41, and the liquid outlet 1121 can discharge the excess immersion liquid in the second cavity out of the battery pack 100, thereby discharging the excess immersion liquid in the liquid cooling channel 41 out of the battery pack 100, thereby accurately controlling the amount of immersion liquid in the battery pack 100, and further effectively ensuring the thermal management effect of the immersion liquid on the battery cell 20.

[0051] For example, Figure 1 and Figure 2 As shown, the first side plate 111 and the second side plate 112 are arranged on the front and rear sides of the liquid-cooling channel 41, the first side plate 111 is arranged on the front side of the liquid-cooling channel 41, and the second side plate 112 is arranged on the rear side of the liquid-cooling channel 41, a first cavity is formed in the first side plate 111, and a liquid inlet 1111 is provided on the first side plate 111, a second cavity is formed in the second side plate 112, and a liquid outlet 1121 is provided on the second side plate 112.

[0052] Furthermore, if Figure 2 As shown, a first opening (not shown in the figure) communicating with the first cavity is formed on the surface of the first side plate 111 facing the second side plate 112, and the first opening communicates with the first cavity and the liquid-cooling channel 41. A second opening 1122 communicating with the second cavity is formed on the surface of the second side plate 112 facing the first side plate 111, and the second opening 1122 communicates with the second cavity and the liquid-cooling channel 41. Thus, the first opening and the second opening 1122 are provided, and the immersion liquid can circulate between the first cavity, the second cavity, and the liquid-cooling channel 41.

[0053] According to some embodiments of the present invention, referring to Figure 1A protective assembly 60 is provided above the cover plate 12, and the protective assembly 60 is communicated with the exhaust hole 121. The protective assembly 60 includes: a baffle 61 and a protective member 62. The baffle 61 is covered at the position of the exhaust hole 121; the protective member 62 is covered on the baffle 61, and the protective member 62 is connected to the cover plate 12. The protective member 62 is provided with a plurality of second explosion-proof valves 621.

[0054] In this way, the baffle 61 can cover the exhaust hole 121, and when the battery cell 20 releases high-temperature gas due to thermal runaway, it can play a role in thermal runaway protection, thereby improving the safety of the battery pack 100. At the same time, the protective member 62 can further increase the protective effect, thereby further improving the safety of the battery pack 100. In addition, the second explosion-proof valve 621 can discharge the high-temperature gas released by the battery cell 20 into the protective member 62 to the outside of the battery pack 100, thereby preventing the battery pack 100 from exploding due to the inability to discharge the gas.

[0055] For example, Figure 1 and Figure 2 As shown, the baffle 61 is bonded to the cover plate 12 and covers the exhaust hole 121 of the cover plate 12, so that the connection strength between the baffle 61 and the cover plate 12 can be ensured to prevent the baffle 61 from being separated from the cover plate 12, and the protective member 62 is provided on the upper side of the cover plate 12, and the protective member 62 covers the baffle 61 between the protective member 62 and the cover plate 12. Preferably, the baffle 61 is a mica board, so that the heat insulation effect of the baffle 61 can be ensured, and the protective member 62 is welded to the cover plate 12, so that the connection strength between the protective member 62 and the cover plate 12 can be ensured.

[0056] According to some optional embodiments of the present invention, referring to Figure 1 The battery pack 100 includes a bus bar 70, which is disposed at the bottom of the mounting cavity and is electrically connected to a plurality of battery cells 20. Thus, this structure is reasonably arranged and can electrically connect a plurality of battery cells 20.

[0057] Furthermore, if Figure 1 As shown, the housing 10 includes a bottom plate 13, the lower part of the box body 11 is open to form an open opening, the bottom plate 13 is arranged at the position of the lower open opening of the box body 11, and a plurality of battery cells 20 are supported on the bottom plate 13, the poles of the battery cells 20 are arranged downward, and the busbar 70 is arranged between the battery cells 20 and the bottom plate 13. Therefore, the poles are arranged downward, and when the battery cells 20 are in thermal runaway, the connection between the poles of the battery cells 20 and the busbar 70 will not be affected, so that the influence of the thermal runaway on the battery pack 100 can be reduced. In addition, the bottom plate 13 provides an installation position for the battery cells 20, which is convenient for the installation of the battery cells 20.

[0058] For example, Figure 1As shown, the upper and lower sides of the box body 11 are open to form an open opening, the cover plate 12 is covered at the position of the upper open opening of the box body 11, and the bottom plate 13 is connected to the position of the lower open opening of the box body 11. The box body 11, the cover plate 12 and the bottom plate 13 form a closed shell 10, and multiple battery cells 20 are supported on the bottom plate 13.

[0059] According to the power device of the second embodiment of the utility model, Figure 1 , including the battery pack 100 of the first aspect of this embodiment.

[0060] According to the power device of the embodiment of the utility model, by setting the battery pack 100 of the first embodiment mentioned above, a seal 30 is set, and the seal 30 can isolate the immersion liquid from the first explosion-proof valve 21. When the battery cell 20 releases high-temperature gas due to thermal runaway, the immersion liquid can be effectively prevented from being sprayed out with the high-temperature gas, thereby reducing the impact of thermal runaway on the thermal management performance of the immersion liquid, and further effectively improving the safety of the battery pack 100.

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0065] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A housing, wherein a mounting cavity is formed in the housing, wherein the mounting cavity is filled with an immersion liquid, wherein the housing comprises a cover plate, wherein an exhaust hole is formed on the cover plate; A battery cell, wherein the battery cell comprises a plurality of battery cells, the plurality of battery cells are arranged along the thickness direction of the battery cell and are located in the immersion liquid, and each of the battery cells is provided with a first explosion-proof valve; A sealing member is disposed on the upper side of the battery cell, and a through hole is formed on the sealing member, one side of the through hole is communicated with the valve port of the first explosion-proof valve, and the other side of the through hole is communicated with the exhaust hole.

2. The battery pack according to claim 1, characterized in that: The sealing member comprises: a support body, the support body extending in a ring shape around the plurality of battery cells; A sealing body, wherein the sealing body extends along the arrangement direction of the battery cells and both ends of the sealing body are connected to the supporting body, the through hole is formed on the sealing body, and the through hole is arranged in a one-to-one correspondence with the first explosion-proof valve and is connected to the first explosion-proof valve.

3. The battery pack according to claim 2, characterized in that: The shell comprises: a box body, the interior of the box body forms a mounting cavity, the upper part of the box body is opened to form an open opening, the open opening is communicated with the box body, and the support body is arranged at the open position and supported at the upper end of the box body.

4. The battery pack according to claim 3, characterized in that: Liquid cooling channels are formed on both sides of the battery cell. The liquid cooling channels extend along the length direction of the battery cell. The immersion liquid flows in the liquid cooling channels. The flow cross section of the liquid cooling channels gradually increases first and then gradually decreases.

5. The battery pack according to claim 4, characterized in that: include: elastic member, the number of the elastic members is two, and the liquid cooling channel is defined between the two elastic members, At least one partition is disposed in the middle of the elastic member. The partition extends along the flow direction of the liquid cooling channel. The partition is disposed in the liquid cooling channel and divides the liquid cooling channel into a plurality of partitions.

6. The battery pack according to claim 5, characterized in that: The box body includes a first side plate and a second side plate, the first side plate and the second side plate are arranged on both sides of the liquid cooling channel, a first cavity is formed on one of the first side plate and a second cavity is formed on the other, one end of the liquid cooling channel is connected to the first cavity, and the other end of the liquid cooling channel is connected to the second cavity.

7. The battery pack according to claim 6, characterized in that: A first cavity is formed on the first side plate, a second cavity is formed on the second side plate, a liquid inlet is formed on the first side plate and communicates with the first cavity, a liquid outlet is formed on the second side plate and communicates with the second cavity.

8. The battery pack according to claim 1, characterized in that: A protective component is provided above the cover plate, the protective component is communicated with the exhaust hole, and the protective component includes: A baffle, wherein the baffle cover is arranged at the position of the exhaust hole; A protective member, wherein the protective member cover is arranged on the baffle plate, the protective member is connected to the cover plate, and the protective member is provided with a plurality of second explosion-proof valves.

9. The battery pack according to claim 1, characterized in that: include: A bus bar is arranged at the bottom of the installation cavity and is electrically connected to the plurality of battery cells.

10. A power device, characterized in that: Comprising a battery pack according to any one of claims 1-9.

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