Battery pack

Abstract

This application provides a battery pack, including a housing and a cell assembly. The housing includes a top and a bottom distributed along a first direction, and a cavity located between the top and the bottom for containing a temperature regulating medium. The cell assembly is disposed within the cavity and includes multiple cells. The temperature regulating medium is used to contact the surfaces of the multiple cells to regulate their temperature. A pressure relief structure is provided at one end of each cell near the bottom, and a pressure relief hole is provided at the bottom corresponding to the pressure relief structure. A sealing ring is also provided around the pressure relief hole between the bottom and the cell. The bottom and the cell clamp the sealing ring to form a sealed protective structure. This prevents the temperature regulating medium inside the housing from leaking out through the gap between the cell and the bottom of the housing, and also allows high-pressure gas inside the cell to be discharged through the pressure relief hole at the bottom of the housing after the pressure relief structure is opened, thus achieving smooth pressure relief of the cell. The structure is relatively simple.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack. Background Technology

[0002] In related technologies, in order to improve the cooling or heating efficiency and uniformity of the battery cells, a temperature regulating medium is set inside the battery pack, and the battery cells are at least partially immersed in the temperature regulating medium, so that the temperature regulating medium is in direct contact with the surface of the battery cells to quickly cool or heat the battery cells.

[0003] However, immersing the battery cells in a temperature-regulating medium to adjust their temperature places high demands on the sealing performance of the enclosure, making it difficult to depressurize the battery cells. Utility Model Content

[0004] The embodiments of this application provide a battery pack that can improve the technical problem that the method of immersing the battery cell in a temperature-regulating medium to regulate the battery cell temperature requires high sealing performance of the casing, making it difficult to depressurize the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery pack, comprising:

[0006] The enclosure includes a top and a bottom distributed along a first direction, and a cavity located between the top and the bottom, the cavity being used to contain a temperature regulating medium;

[0007] A battery cell assembly is disposed within the cavity, the battery cell assembly comprising a plurality of battery cells, and the temperature regulating medium is used to contact the surfaces of the plurality of battery cells to regulate the temperature of the battery cells;

[0008] The battery cell has a pressure relief structure at one end near the bottom, and a pressure relief hole is provided at the bottom corresponding to the position of the pressure relief structure. A sealing ring is also provided between the bottom and the battery cell, surrounding the pressure relief hole. The bottom and the battery cell clamp the sealing ring to form a sealed protection structure.

[0009] In some embodiments, one side of the sealing ring abuts against the bottom surface facing the cavity, and the other side of the sealing ring abuts against the end face of the battery cell near the bottom.

[0010] In some embodiments, a mounting groove is formed on the bottom surface facing the cavity, the pressure relief hole is formed on the bottom surface of the mounting groove, and at least a portion of the sealing ring is installed in the mounting groove.

[0011] In some embodiments, the bottom includes a base plate and a positioning plate stacked along the first direction, the positioning plate being located on the side of the base plate facing the cavity; the mounting groove includes a positioning hole segment located on the positioning plate, and a groove located on the side of the base plate facing the cavity; the battery cell passes through the positioning hole segment to position the battery cell; at least a portion of the sealing ring is installed in the groove.

[0012] In some embodiments, the positioning hole segment is interference-fitted with the battery cell.

[0013] In some embodiments, the base plate is bonded to the positioning plate.

[0014] In some embodiments, the bottom is provided with a first flow channel and a first connecting hole, one end of the first connecting hole is connected to the first flow channel, and the other end of the first connecting hole is connected to the cavity.

[0015] In some embodiments, the base plate includes a first flow channel plate and a first cover plate stacked along the first direction, the first cover plate being located on the side of the first flow channel plate away from the cavity, the first flow channel plate and the first cover plate forming the first flow channel, and the first connecting hole penetrating the first flow channel plate along the first direction.

[0016] In some embodiments, the first flow channel includes a plurality of flow channel segments connected sequentially along its length, with adjacent flow channel segments arranged at an obtuse angle, the flow channel segments being located between adjacent pressure relief holes, and the first connection hole being located at the connection point of adjacent flow channel segments.

[0017] In some embodiments, the top is provided with a second flow channel and a second connecting hole, one end of the second connecting hole is connected to the second flow channel, and the other end of the second connecting hole is connected to the cavity.

[0018] In some embodiments, the top includes a second flow channel plate and a second cover plate stacked along a first direction, the second flow channel plate being located on the side of the second cover plate facing the cavity, the second flow channel plate and the second cover plate enclosing and forming a plurality of second flow channels distributed along a second direction, the first direction being set at an angle to the second direction;

[0019] The top also includes a plurality of sealing strips sandwiched between the second flow channel plate and the second cover plate, the sealing strips being located between two adjacent second flow channels and extending along the length of the second flow channel.

[0020] The beneficial effects of the embodiments of this application are as follows:

[0021] The battery pack provided in this application embodiment places multiple battery cells of the battery cell assembly inside the cavity of the housing, and uses the cavity of the housing to contain a temperature regulating medium, so that the temperature regulating medium can directly contact the surface of the battery cell to quickly cool or heat the battery cell.

[0022] Based on this, a pressure relief structure is provided at one end of the battery cell near the bottom of the housing. A pressure relief hole is provided at the bottom of the housing corresponding to the pressure relief structure of the battery cell. A sealing ring is also provided around the pressure relief hole between the bottom and the battery cell. The bottom and the battery cell clamp the sealing ring to form a sealed protection structure. This prevents the temperature regulation medium inside the housing from leaking out through the gap between the battery cell and the bottom of the housing. At the same time, it allows the high-pressure gas inside the battery cell to be discharged through the pressure relief hole at the bottom of the housing after the pressure relief structure of the battery cell is opened, so as to achieve smooth pressure relief of the battery cell. The structure is relatively simple. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of one embodiment of the battery pack provided in this application.

[0025] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 Bottom view of the housing provided in an embodiment of this application;

[0028] Figure 5 This is an exploded structural diagram of one embodiment of the battery pack provided in this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-Battery pack; 10-Box; 100-Cavity; 11-Top; 111-Second flow channel; 112-Second connecting hole; 113-Second main flow channel; 114-Second flow channel plate; 1141-Second receiving groove; 115-Second cover plate; 116-Sealing strip; 118-Injection hole; 12-Bottom; 120-Pressure relief hole; 121-Mounting groove; 122-Bottom plate; 1221-First flow channel plate; 1222-First receiving groove; 1223-First cover plate; 1224-Groove; 123-Positioning plate; 1231 - Positioning hole section; 1232 - Through hole; 124 - First flow channel; 1241 - Flow channel section; 125 - First main flow channel; 126 - First connecting hole; 13 - Side plate; 20 - Cell assembly; 21 - Cell; 211 - End plate; 2111 - End face; 2112 - Pressure relief structure; 2113 - Thinning groove; 30 - Sealing ring; 40 - First seal; 50 - Second seal; 60 - Sealing cap; 70 - Busbar; 80 - First pipeline; 90 - Second pipeline; Z - First direction; X - Second direction; Y - Third direction. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0032] This application provides a battery pack. The following provides detailed descriptions of various embodiments of the battery pack.

[0033] Figure 1 This is a schematic diagram of the structure of one embodiment of the battery pack provided in this application. Figure 2 for Figure 1 A cross-sectional view along the AA direction. Figure 3 for Figure 2 A magnified view of point A in the middle. (See image below.) Figures 1 to 3 As shown, the battery pack 1 includes a housing 10 and a cell assembly 20. The housing 10 includes a cavity 100 for containing a temperature regulating medium. The cell assembly 20 is disposed within the cavity 100 of the housing 10 and includes a plurality of cells 21. The temperature regulating medium is used to contact the surfaces of the plurality of cells 21 to regulate the temperature of the cells 21.

[0034] Because the temperature regulating medium is in direct contact with the surfaces of the multiple battery cells 21, rapid heat exchange can occur between the temperature regulating medium and the multiple battery cells 21 to regulate their temperature. The temperature regulating medium can either cool or heat the battery cells 21, depending on the operating environment of the battery cells 21. For example, when the temperature of the battery cells 21 is high, the temperature of the temperature regulating medium can be lower than the temperature of the battery cells 21, allowing the medium to absorb heat from the battery cells 21 and rapidly cool them down. Alternatively, when the temperature of the battery cells 21 is low, the temperature of the temperature regulating medium can be higher than the temperature of the battery cells 21, allowing the medium to transfer heat to the battery cells 21 and rapidly heat them up.

[0035] It should be noted that the temperature regulating medium can be coolant, refrigerant, or other media capable of regulating the temperature of the battery cell 21; there are no restrictions here. Furthermore, the temperature regulating medium within the cavity 100 of the housing 10 can circulate. That is, the cooling medium outside the housing 10 enters the cavity 100 through a pipe to exchange heat with the battery cell 21, and then flows out through another pipe, thereby improving the efficiency of the temperature regulating medium in regulating the temperature of the battery cell 21. Alternatively, the temperature regulating medium can be directly retained within the cavity 100 of the housing 10, depending on the heat generation of the battery cell 21 in the battery pack 1.

[0036] like Figure 2 As shown, the housing 10 includes a top 11 and a bottom 12 distributed along a first direction Z, and the cavity 100 of the housing 10 is located between the top 11 and the bottom 12. In some embodiments, a pressure relief structure 2112 may be provided at one end of the battery cell 21 near the bottom 12, and a pressure relief hole 120 may be provided at the bottom 12 of the housing 10 corresponding to the pressure relief structure 2112. When the pressure inside the battery cell 21 is too high, causing the pressure relief structure 2112 of the battery cell 21 to open, the high-pressure gas inside the battery cell 21 can be discharged through the pressure relief hole 120 at the bottom 12 of the housing 10, thereby relieving the pressure of the battery cell 21.

[0037] A sealing ring 30 is provided around the pressure relief hole 120 between the bottom 12 and the battery cell 21. The bottom 12 and the battery cell 21 clamp the sealing ring 30 to form a sealed protective structure. This prevents the temperature regulating medium inside the cavity 100 of the housing 10 from leaking out through the gap between the battery cell 21 and the bottom 12 of the housing 10.

[0038] The battery pack 1 provided in this application embodiment places multiple battery cells 21 of the battery cell assembly 20 inside the cavity 100 of the housing 10, and uses the cavity 100 of the housing 10 to contain a temperature regulating medium, so that the temperature regulating medium can directly contact the surface of the battery cell 21 to quickly cool or heat the battery cell 21.

[0039] Based on this, a pressure relief structure 2112 is provided at one end of the battery cell 21 near the bottom 12 of the housing 10. A pressure relief hole 120 is provided at the bottom 12 of the housing 10 corresponding to the pressure relief structure 2112 of the battery cell 21. A sealing ring 30 is also provided around the pressure relief hole 120 between the bottom 12 and the battery cell 21. The bottom 12 and the battery cell 21 clamp the sealing ring 30 to form a sealed protection structure. This prevents the temperature regulating medium in the cavity 100 of the housing 10 from leaking out through the gap between the battery cell 21 and the bottom 12 of the housing 10. At the same time, it allows the high-pressure gas in the battery cell 21 to be discharged through the pressure relief hole 120 of the bottom 12 of the housing 10 after the pressure relief structure 2112 of the battery cell 21 is opened, thus realizing the smooth pressure relief of the battery cell 21. The structure is relatively simple.

[0040] It should be noted that each cell 21 of the battery cell assembly 20 can be equipped with a pressure relief structure 2112, or only some cells 21 of the battery cell assembly 20 can be equipped with a pressure relief structure 2112. Of course, the former allows each cell 21 to achieve pressure relief, which is beneficial to improving the safety of the battery pack 1.

[0041] Alternatively, the bottom plate 122 of the housing 10 can be provided with pressure relief holes 120 at the positions corresponding to the pressure relief structures 2112 of each battery cell 21, or the bottom plate 122 of the housing 10 can be provided with pressure relief holes 120 at the positions corresponding to the pressure relief structures 2112 of some battery cells 21. Of course, the former allows each battery cell 21 to be depressurized through the corresponding pressure relief hole 120, further improving the safety of the battery pack 1.

[0042] Furthermore, the correspondence between the pressure relief structure 2112 and the pressure relief hole 120 means that after the pressure relief structure 2112 of the battery cell 21 is opened, the interior of the battery cell 21 can communicate with the pressure relief hole 120 through the opened pressure relief structure 2112, allowing the high-pressure gas inside the battery cell 21 to be discharged through the pressure relief hole 120 at the bottom 12 of the housing 10. Specifically, the pressure relief structure 2112 and the pressure relief hole 120 can at least partially overlap in the first direction Z, so that the pressure relief structure 2112 and the pressure relief hole 120 correspond in position, facilitating the discharge of high-pressure gas inside the battery cell 21 through the pressure relief hole 120 at the bottom 12 of the housing 10 after the pressure relief structure 2112 of the battery cell 21 is opened.

[0043] Specifically, the orthogonal projection of the pressure relief hole 120 in the first direction Z can cover the orthogonal projection of the pressure relief structure 2112 in the first direction Z, so that after the pressure relief structure 2112 is opened, the high-pressure gas inside the battery cell 21 can be discharged more smoothly from the pressure relief hole 120 at the bottom 12 of the housing 10.

[0044] like Figure 3 As shown, the battery cell 21 includes an end plate 211 located at one end of the battery cell 21 near the bottom 12 of the housing 10. The end plate 211 is provided with a pressure relief structure 2112. In some embodiments, a thinning groove 2113 can be formed on the side of the end plate 211 away from the bottom 12 of the housing 10 to form the pressure relief structure 2112. When the pressure inside the battery cell 21 is too high, the thinning groove 2113 of the end plate 211 will break under the pressure inside the battery cell 21, thereby allowing the high-pressure gas inside the battery cell 21 to be discharged through the break in the thinning groove 2113, and then discharged outside the housing 10 through the pressure relief hole 120 at the bottom 12, thus achieving pressure relief of the battery cell 21.

[0045] Among them, the thinning groove 2113 can be an annular groove that extends along the circumference of the cell 21. Thus, when the thinning groove 2113 is broken, a through hole with a large flow area can be formed in the end plate 211, which is beneficial to improving the pressure relief efficiency of the pressure relief structure 2112 of the cell 21.

[0046] Alternatively, a thinning groove 2113 can be formed on the side of the end plate 211 facing the bottom 12 of the housing 10 to form a pressure relief structure 2112. Or, a through pressure relief port can be formed on the end plate 211, and a pressure relief valve can be installed at the pressure relief port to form a pressure relief structure 2112. This pressure relief valve is used to open when the pressure inside the cell 21 is too high, so that the high-pressure gas inside the cell 21 can be discharged through the pressure relief valve.

[0047] In some embodiments, one side of the sealing ring 30 may abut against the surface of the bottom 12 facing the cavity 100, and the other side of the sealing ring 30 may abut against the end face 2111 of the battery cell 21 near the bottom 12, thereby further improving the sealing effect of the sealing ring 30 between the battery cell 21 and the bottom 12.

[0048] Specifically, a mounting groove 121 can be formed on the surface of the bottom 12 of the housing 10 facing the cavity 100, so that the pressure relief hole 120 is formed on the bottom surface of the mounting groove 121, and at least a portion of the sealing ring 30 is installed in the mounting groove 121. This allows the sealing ring 30 to be positioned via the mounting groove 121, making the position of the sealing ring 30 more stable and improving its sealing effect.

[0049] Specifically, the bottom 12 of the housing 10 includes a bottom plate 122 and a positioning plate 123 stacked along the first direction Z. The positioning plate 123 is located on the side of the bottom plate 122 facing the cavity 100. The mounting groove 121 includes a positioning hole section 1231 located on the positioning plate 123. The battery cell 21 passes through the positioning hole section 1231 to position the battery cell 21 and keep the position of the battery cell 21 relative to the bottom 12 stable.

[0050] The mounting slot 121 also includes a groove 1224 located on the side of the base plate 122 facing the cavity 100, and at least a portion of the sealing ring 30 is installed in the groove 1224. When the battery cell 21 is inserted into the mounting slot 121, the end face 2111 of the battery cell 21 near the bottom 12 can press the sealing ring 30 against the bottom surface of the groove 1224, thereby improving the sealing effect of the sealing ring 30.

[0051] It should be noted that the sealing ring 30 can be entirely installed within the groove 1224, meaning the entire sealing ring 30 is contained within the groove 1224. Alternatively, a portion of the sealing ring 30 can be installed within the groove 1224, while the other portion extends outside the groove 1224. That is, a portion of the sealing ring 30 is contained within the groove 1224, while the other portion extends outside the groove 1224.

[0052] Specifically, the positioning hole section 1231 of the positioning plate 123 can be interference-fitted with the battery cell 21, that is, the inner diameter of the positioning hole section 1231 of the positioning plate 123 is slightly smaller than the outer diameter of the battery cell 21. When the battery cell 21 passes through the positioning hole section 1231 of the positioning plate 123, there is a certain compressive force between the inner circumferential surface of the positioning hole section 1231 and the outer circumferential surface of the battery cell 21, thereby further improving the positioning effect of the positioning plate 123 on the battery cell 21.

[0053] In addition, the pressure relief hole 120 of the bottom 12 is opened on the bottom surface of the groove 1224. When the end of the battery cell 21 near the bottom 12 is inserted into the mounting groove 121, the pressure relief structure 2112 of the battery cell 21 can be quickly aligned with the pressure relief hole 120 of the bottom 12, so that when the pressure relief structure 2112 is opened, the high pressure gas in the battery cell 21 can be quickly and accurately discharged through the pressure relief hole 120 of the bottom 12.

[0054] In some embodiments, the base plate 122 and the positioning plate 123 can be bonded together to facilitate the connection between them. Of course, the base plate 122 and the positioning plate 123 can also be connected by screws, snap-fit ​​connections, or other methods.

[0055] In some embodiments, such as Figure 3As shown, a first flow channel 124 and a first connecting hole 126 can be provided at the bottom 12 of the housing 10. One end of the first connecting hole 126 communicates with the first flow channel 124, and the other end of the first connecting hole 126 communicates with the cavity 100 of the housing 10. Thus, the first flow channel 124 communicates with the cavity 100 of the housing 10 through the first connecting hole 126, so as to provide a temperature regulating medium to the cavity 100 of the housing 10 through the first flow channel 124 and the first connecting hole 126, or to allow the temperature regulating medium of the cavity 100 of the housing 10 to be discharged outside the housing 10 through the first connecting hole 126 and the first flow channel 124.

[0056] Among them, such as Figure 4 As shown, the first flow channel 124 at the bottom 12 may include multiple flow channel segments 1241 connected sequentially along its length. Adjacent flow channel segments 1241 are set at an obtuse angle. The flow channel segments 1241 are located between two adjacent pressure relief holes 120, and the first connecting hole 126 is located at the connection point of two adjacent flow channel segments 1241. Thus, the first connecting hole 126 can be set to correspond to the gap between three adjacent battery cells 21, reducing the resistance encountered by the temperature regulating medium when flowing between the first connecting hole and the cavity 100, which is beneficial to increasing the flow velocity of the temperature regulating medium between the first connecting hole and the cavity 100, thereby improving the cooling or heating efficiency of the battery cell 21.

[0057] Specifically, multiple flow channel segments 1241 of the first flow channel 124 are sequentially arranged along the second direction X. There are multiple first flow channels 124, which are sequentially distributed along the third direction Y. The first direction Z, the second direction X, and the third direction Y are arranged at angles to each other. The angles formed by the first direction Z, the second direction X, and the third direction Y can be right angles or acute angles.

[0058] The bottom 12 is provided with a plurality of first connecting holes 126 corresponding to each first flow channel 124. The plurality of first connecting holes 126 communicating with the same first flow channel 124 are arranged along the length of the first flow channel 124. One end of the plurality of first flow channels 124 is respectively connected to a first pipeline 80 through a first main flow channel 125. The first pipeline 80 can be a liquid inlet pipe or a liquid outlet pipe.

[0059] like Figure 2 and Figure 3 As shown, the base plate 122 may include a first flow channel plate 1221 and a first cover plate 1223 stacked along the first direction Z. The first cover plate 1223 is located on the side of the first flow channel plate 1221 facing away from the cavity 100. The first flow channel plate 1221 and the first cover plate 1223 together form a first flow channel 124. A first connecting hole 126 penetrates the first flow channel plate 1221 along the first direction Z.

[0060] Specifically, a strip groove can be opened on the side of the first flow channel plate 1221 facing the first cover plate 1223, and the first cover plate 1223 can cover the strip groove of the first flow channel plate 1221, so that the first flow channel plate 1221 and the first cover plate 1223 can surround and form the first flow channel 124.

[0061] Of course, a strip groove can also be opened on the side of the first cover plate 1223 facing the first flow channel plate 1221, and the first flow channel plate 1221 can cover the strip groove of the first cover plate 1223, so that the first flow channel plate 1221 and the first cover plate 1223 can surround and form the first flow channel 124.

[0062] When the bottom 12 also includes a positioning plate 123, a through hole 1232 connecting the first connecting hole 126 and the cavity 100 can be provided in the positioning plate 123 to avoid the positioning plate 123 blocking the first connecting hole 126, which would prevent the first connecting hole 126 from communicating with the cavity 100.

[0063] The housing 10 also includes multiple side plates 13 disposed around the bottom 12. The bottom 12, top 11, and multiple side plates 13 of the housing 10 enclose a cavity 100. A first sealing member 40 is provided between the bottom 12 and the side plates 13 to seal the gap between the bottom 12 and the side plates 13. Specifically, a first receiving groove 1222 is formed on the surface of the first flow channel plate 1221 facing the side plate 13. The first sealing member 40 is disposed within the first receiving groove 1222, and the side of the first sealing member 40 away from the first flow channel plate 1221 abuts against the corresponding side plate 13 to seal the gap between the first flow channel plate 1221 and the corresponding side plate 13.

[0064] In some embodiments, such as Figure 2 and Figure 5 As shown, a second flow channel 111 and a second connecting hole 112 can be provided on the top 11. One end of the second connecting hole 112 communicates with the second flow channel 111, and the other end of the second connecting hole 112 communicates with the cavity 100. Thus, the second flow channel 111 communicates with the cavity 100 of the housing 10 through the second connecting hole 112, so as to provide a temperature regulating medium to the cavity 100 of the housing 10 through the second flow channel 111 and the second connecting hole 112, or to allow the temperature regulating medium of the cavity 100 of the housing 10 to be discharged outside the housing 10 through the second connecting hole 112 and the second flow channel 111.

[0065] The second connection hole 112 can be positioned to correspond with the first connection hole 126, so that the temperature regulating medium can enter the cavity 100 from the first connection hole 126 and flow out from the second connection hole 112 more quickly, or the temperature regulating medium can enter the cavity 100 from the second connection hole 112 and flow out from the first connection hole 126 more quickly.

[0066] Continue to refer to Figure 2 and Figure 5 The top 11 of the housing 10 includes a second flow channel plate 114 and a second cover plate 115 stacked along the first direction Z. The second flow channel plate 114 is located on the side of the second cover plate 115 facing the cavity 100. The second flow channel plate 114 and the second cover plate 115 enclose and form a plurality of second flow channels 111 distributed along the second direction X, thereby making the processing of the top 11 more convenient.

[0067] In this design, multiple strip-shaped grooves distributed along the second direction X can be opened on the side of the second flow channel plate 114 facing the second cover plate 115, and the second cover plate 115 can cover the multiple strip-shaped grooves of the second flow channel plate 114, so that the second flow channel plate 114 and the second cover plate 115 can enclose and form multiple second flow channels 111 distributed along the second direction X.

[0068] Of course, multiple strip-shaped grooves distributed along the second direction X can also be opened on the side of the second cover plate 115 facing the second flow channel plate 114, and the second flow channel plate 114 can cover the multiple strip-shaped grooves of the second cover plate 115, so that the second flow channel plate 114 and the second cover plate 115 can enclose and form multiple second flow channels 111 distributed along the second direction X.

[0069] The top 11 of the housing 10 also includes a plurality of sealing strips 116 sandwiched between the second flow channel plate 114 and the second cover plate 115. The sealing strips 116 are located between two adjacent second flow channels 111 and extend along the length of the second flow channel 111. Thus, the sealing strips 116 can separate two adjacent second flow channels 111, preventing the temperature regulating medium in the second flow channel 111 from overflowing into other second flow channels 111, and allowing the temperature regulating medium in the second flow channel 111 to be more evenly distributed into the plurality of second connecting holes 112 communicating with the second flow channel 111.

[0070] Specifically, the top 11 is provided with a plurality of second connecting holes 112 corresponding to each second flow channel 111. The plurality of second connecting holes 112 communicating with the same second flow channel 111 are arranged along the length direction of the second flow channel 111. One end of the plurality of second flow channels 111 is respectively connected to the second pipeline 90 through the second main flow channel 113. The second pipeline 90 can be a liquid inlet pipe or a liquid outlet pipe.

[0071] In some embodiments, a second sealing member 50 may be provided between the top 11 and the side plate 13 to seal the gap between the top 11 and the side plate 13. Specifically, a second sealing member 50 is provided between the second flow channel plate 114 and the side plate 13 to seal the gap between the second flow channel plate 114 and the side plate 13. A second receiving groove 1141 is formed on the surface of the second flow channel plate 114 facing the side plate 13, and the second sealing member 50 is disposed in the second receiving groove 1141. The side of the second sealing member 50 away from the second flow channel plate 114 abuts against the corresponding side plate 13 to seal the gap between the second flow channel plate 114 and the corresponding side plate 13.

[0072] In some embodiments, such as Figure 1 As shown, a liquid injection hole 118 is also provided on the top 11 of the housing 10. The liquid injection hole 118 penetrates the top 11 of the housing 10 along the first direction Z and communicates with the cavity 100, so as to replenish the temperature regulating medium into the cavity 100 of the housing 10 through the liquid injection hole 118. A sealing cap 60 is also provided at the liquid injection hole 118 to seal the liquid injection hole 118 and prevent the temperature regulating medium inside the cavity 100 from leaking out of the liquid injection hole 118.

[0073] In some embodiments, such as Figure 5 As shown, the battery pack 1 also includes a busbar 70 disposed in the cavity 100 of the housing 10. The busbar 70 is located on the side of the cell assembly 20 near the top 11 of the housing 10 and is connected to a plurality of cells 21 of the cell assembly 20 to connect the plurality of cells 21 of the cell assembly 20 in series or in parallel.

[0074] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack, characterized by, include: The enclosure includes a top and a bottom distributed along a first direction, and a cavity located between the top and the bottom, the cavity being used to contain a temperature regulating medium; A battery cell assembly is disposed within the cavity, the battery cell assembly comprising a plurality of battery cells, and the temperature regulating medium is used to contact the surfaces of the plurality of battery cells to regulate the temperature of the battery cells; The battery cell has a pressure relief structure at one end near the bottom, and a pressure relief hole is provided at the bottom corresponding to the position of the pressure relief structure. A sealing ring is also provided between the bottom and the battery cell, surrounding the pressure relief hole. The bottom and the battery cell clamp the sealing ring to form a sealed protection structure.

2. The battery pack of claim 1, wherein, One side of the sealing ring abuts against the bottom surface facing the cavity, and the other side of the sealing ring abuts against the end face of the battery cell near the bottom.

3. The battery pack of claim 1, wherein, The bottom surface facing the cavity has an installation groove, the pressure relief hole is opened on the bottom surface of the installation groove, and at least a part of the sealing ring is installed in the installation groove.

4. The battery pack of claim 3, wherein, The bottom includes a base plate and a positioning plate stacked along the first direction, the positioning plate being located on the side of the base plate facing the cavity; the mounting groove includes a positioning hole section located on the positioning plate, and a groove located on the side of the base plate facing the cavity; the battery cell passes through the positioning hole section to position the battery cell; at least a portion of the sealing ring is installed in the groove.

5. The battery pack of claim 4, wherein, The positioning hole section is interference-fitted with the battery cell.

6. The battery pack of claim 4, wherein, The base plate is bonded to the positioning plate.

7. The battery pack according to any one of claims 1 to 6, wherein The bottom is provided with a first flow channel and a first connecting hole. One end of the first connecting hole is connected to the first flow channel, and the other end of the first connecting hole is connected to the cavity.

8. The battery pack of claim 7, wherein, The bottom includes a base plate, which includes a first flow channel plate and a first cover plate stacked along the first direction. The first cover plate is located on the side of the first flow channel plate away from the cavity. The first flow channel plate and the first cover plate enclose the first flow channel. The first connecting hole penetrates the first flow channel plate along the first direction.

9. The battery pack of claim 7, wherein, The first flow channel includes a plurality of flow channel segments connected sequentially along its length, with adjacent flow channel segments arranged at an obtuse angle, the flow channel segments being located between adjacent pressure relief holes, and the first connecting hole being located at the connection point of adjacent flow channel segments.

10. The battery pack of any one of claims 1 to 6, wherein, The top is provided with a second flow channel and a second connecting hole. One end of the second connecting hole is connected to the second flow channel, and the other end of the second connecting hole is connected to the cavity.

11. The battery pack of claim 10, wherein, The top includes a second flow channel plate and a second cover plate stacked along a first direction. The second flow channel plate is located on the side of the second cover plate facing the cavity. The second flow channel plate and the second cover plate enclose and form a plurality of second flow channels distributed along a second direction. The first direction and the second direction are set at an angle. The top also includes a plurality of sealing strips sandwiched between the second flow channel plate and the second cover plate, the sealing strips being located between two adjacent second flow channels and extending along the length of the second flow channel.

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