Battery pack

Abstract

The present disclosure provides a battery pack, which can prevent the adhesive from shielding the explosion-proof valve of the battery cell at least to a certain extent, thereby ensuring the safety.SOLUTION: According to the present invention, there are provided a plurality of battery cells each having a battery-cell explosion-proof valve and defining a surface on which the battery-cell explosion-proof valve is positioned as a first battery-cell end surface; a housing in which all of the battery cells are installed; and a battery cell protection structure in which at least a part of the battery cell protection structure is installed between an inner surface of the housing and the battery cell. The battery cell is disposed on the carrying member, the first cell end surface faces the carrying member, the carrying member is provided with an exhaust through hole corresponding to the cell explosion-proof valve, the exhaust through hole is in communication with the exhaust passage, and a side wall of the carrying member close to the first cell end surface is provided with a glue storage groove.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the field of power batteries, and more particularly to battery packs. [Background technology]

[0002] In a conventional battery pack, the battery pack includes a housing and a plurality of battery cells installed in the housing, each of which has a battery cell explosion-proof valve. When the battery cells are cylindrical, the battery cell explosion-proof valve is located at the bottom of the battery cell. After the battery cells and housing are assembled, adhesive is injected into the housing, creating a risk of blocking the battery cell explosion-proof valve as the adhesive flows. If the adhesive blocking the battery cell explosion-proof valve hardens, thermal runaway of the battery cells may occur, affecting the smooth opening of the battery cell explosion-proof valve and trapping gas inside the battery cells, leading to more serious phenomena such as large-area rupture and the ejection of positive poles, thereby affecting the safety of the battery pack. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of this, the present invention aims to provide a battery pack that solves the problem of adhesive blocking the battery cell explosion-proof valve and affecting the release and exhaust of the battery cell explosion-proof valve, thereby ensuring the safety of the battery pack. [Means for solving the problem]

[0004] In accordance with the above objectives, the present invention provides a battery pack comprising: a plurality of battery cells, each having a battery cell explosion-proof valve, the surface on which the battery cell explosion-proof valve is located being defined as a first battery cell end face; a housing into which the plurality of battery cells are all installed; and a support member at least a portion of which is located between the inner surface of the housing and the battery cells and defines an exhaust passage between the inner surface of the housing and the support member, the battery cells being installed on the support member, the end face of the first battery cell facing the support member, an exhaust hole formed in the support member corresponding to the battery cell explosion-proof valve, the exhaust hole communicating with the exhaust passage, and an adhesive storage groove formed in a side wall of the support member close to the end face of the first battery cell.

[0005] Optionally, a positioning groove is formed in the side wall of the carrier member away from the exhaust passage, the end face of the first battery cell is located in the positioning groove, the exhaust hole and the adhesive storage groove are both located at the bottom of the positioning groove, and the adhesive storage groove is located between the side wall of the positioning groove and the hole wall of the exhaust hole.

[0006] Optionally, the adhesive reservoir groove surrounds the vent hole and presents a continuous annular groove or an intermittent annular groove.

[0007] Optionally, the adhesive reservoir groove extends at least around the circumference of the exhaust hole in a radial direction.

[0008] Optionally, the groove bottom of the positioning groove has a contact area, and the contact area is located along the radial direction of the exhaust hole between the hole wall of the exhaust hole and the side wall of the adjacent adhesive storage groove, and the end face of the first battery cell abuts at least the contact area.

[0009] Optionally, the sealing area comprises a continuous annular area surrounding the exhaust vent.

[0010] Optionally, along a first direction, the orthogonal projection of the battery cell explosion-proof valve onto the groove bottom of the positioning groove is located within the outer contour of the exhaust hole, and the first direction is perpendicular to the groove bottom of the positioning groove.

[0011] Optionally, the side wall of the positioning groove and the adjacent side wall of the adhesive storage groove are spaced apart along the radial direction of the exhaust hole to form a support area at the groove bottom of the positioning groove, the support area being located between the side wall of the positioning groove and the adjacent side wall of the adhesive storage groove, and the support area being used to support the end face of the first battery cell.

[0012] Optionally, an adhesive member is connected to the end surface of the first battery cell, and the end surface of the first battery cell is connected to at least the support area through the adhesive member.

[0013] Optionally, a protruding protrusion structure is provided on a side wall of the carrier member away from the end face of the first battery cell, and the adhesive storage groove extends into the protrusion structure along a first direction, which is perpendicular to the end face of the first battery cell. [Effects of the Invention]

[0014]

[0013] As can be seen from the above, the battery pack provided by the present invention has an adhesive storage groove on the side wall of the support member near the end face of the first battery cell, and even if adhesive flows into the gap between the end face of the first battery cell and the surface of the support member, at least a portion of the adhesive that flows into the gap flows into the adhesive storage groove and cannot flow back toward the battery cell explosion-proof valve, thereby preventing the adhesive from blocking the battery cell explosion-proof valve to at least a certain extent. In the event of thermal runaway of the battery cell, the battery cell explosion-proof valve can open relatively smoothly, and the thermal runaway gas generated by the battery cell can smoothly flow into the exhaust passage through the battery cell explosion-proof valve and the exhaust hole, preventing the occurrence of more serious phenomena such as large-area rupture of the battery cell or the protrusion of the positive electrode post, thereby ensuring the safety of the battery pack. [Brief explanation of the drawings]

[0015] In order to more clearly describe the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required in the description of the embodiments or the prior art, it is obvious that the drawings described below are only some embodiments of the present invention, and those ordinary skilled in the art can obtain other drawings based on these drawings without paying creative labor.

[0016] [Figure 1] 1 is a schematic three-dimensional view of a partial structure of a battery pack according to an embodiment of the present invention; [Figure 2] 1 is a partial cross-sectional schematic view of a battery pack according to an embodiment of the present invention. [Figure 3] 2 is a schematic three-dimensional view of a support member of the battery pack according to the embodiment of the present invention. FIG. [Figure 4] 1 is a schematic three-dimensional view of a battery pack according to an embodiment of the present invention, in which battery cells are attached to a support member. [Figure 5] 1 is a top view of a side wall of a support member of a battery pack according to an embodiment of the present invention, the side wall being away from the exhaust passage. [Figure 6] 10 is a top view of another structure of the side wall of the support member of the battery pack away from the exhaust passage in the embodiment of the present invention. FIG. [Figure 7] FIG. 3 is an enlarged view of part A in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail hereinafter in combination with specific embodiments and with reference to the accompanying drawings.

[0018] It should be noted that unless otherwise specifically stated, the relative arrangement of parts, formulas and numerical values ​​described in these examples do not limit the scope of the present invention.

[0019] At the same time, it should be understood that for ease of explanation, the dimensions of the various parts shown in the accompanying drawings have not been drawn to scale.

[0020] The following description of one or more exemplary embodiments is merely illustrative in nature and is in no way intended to serve as any limitation on the invention and its application or uses.

[0021] It should be noted that, unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have their ordinary meanings as understood by a person of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this description do not denote any order, quantity, or importance, but are used only to distinguish different components. Similar terms such as "comprise" or "include" mean that the element or object appearing before the term encompasses the elements or objects listed thereafter and their equivalents, and do not exclude other elements or objects. Similar terms such as "connect" or "interconnect" are not limited to physical or mechanical connections, but can also include electrical connections, whether direct or indirect. Terms such as "top," "bottom," "left," and "right" are used only to indicate relative positions, and if the absolute positions of the objects being described change, the relative positions may also change accordingly.

[0022] As shown in Fig. 1, Fig. 1 shows a three-dimensional schematic diagram of a partial structure of a battery pack. The battery pack may include a housing 200, which may include a bottom plate 230 and four side plates 220 connected to the edges of the bottom plate 230. The bottom plate 230 and the four side plates 220 together define an accommodating space 210 located inside the housing 200. The battery pack further includes a plurality of battery cells 100 mounted in the accommodating space 210, which may be cylindrical battery cells.

[0023] As shown in Figure 1, a housing explosion-proof valve 221 is attached to a side plate 220 of the housing 200. As shown in Figure 2, Figure 2 shows a partial cross-sectional view of a battery pack. When the battery cell 100 is a cylindrical battery cell, the battery cell explosion-proof valve 110 is located at the bottom of the battery cell 100, close to the bottom plate 230 of the housing 200. When the battery cell 100 experiences thermal runaway, the housing explosion-proof valve 221 opens, and the thermal runaway gas ejected from the battery cell explosion-proof valve 110 flows toward the housing explosion-proof valve 221 and is exhausted to the outside of the housing 200 through the housing explosion-proof valve 221.

[0024] After the battery cell 100 is installed in the receiving space 210 of the housing 200, an adhesive needs to be injected into the receiving space 210 to seal the battery cell 100 within the housing 200. The applicant's research has found that because there is a gap between the bottom of the battery cell 100 and the surface of the structure supporting the battery cell 100, the adhesive may enter the receiving space 210, flow into this gap, and spread to the location of the battery cell explosion-proof valve 110, potentially shielding the battery cell explosion-proof valve 110. After the adhesive that shields the battery cell explosion-proof valve 110 hardens, it connects to the bottom of the battery cell 100, forming a structure with a certain degree of strength. If the battery cell 100 experiences thermal runaway, the structure formed by the adhesive that shields the battery cell explosion-proof valve 110 will prevent the battery cell explosion-proof valve 110 from opening smoothly, resulting in thermal runaway gas being trapped inside the battery cell 100, which may cause more serious phenomena such as a large-area rupture of the battery cell 100 or the positive electrode post popping out, thereby affecting the safety of the battery pack.

[0025] In view of this, as shown in FIG. 2 , in some embodiments, a battery pack includes a housing 200, a carrier 1, and a plurality of battery cells 100. Each battery cell 100 has a battery cell explosion-proof valve 110, and the surface on which the battery cell explosion-proof valve 110 is located is defined as a first battery cell end face 120. All of the battery cells 100 are installed within the housing 200. At least a portion of the carrier 1 is installed between the inner surface of the housing 200 and the battery cells 100, defining an exhaust passage 300 between the carrier 1 and the inner surface of the housing 200. The battery cells 100 are installed on the carrier 1, with the first battery cell end face 120 facing the carrier 1. The carrier 1 is provided with an exhaust hole 15 corresponding to the battery cell explosion-proof valve 110, and the exhaust hole 15 communicates with the exhaust passage 300. An adhesive storage groove 12 is installed on the side wall of the carrier 1 near the first battery cell end face 120.

[0026] For example, along the axial direction of the battery cell 100 (e.g., the Z direction in FIG. 2 ), the orthogonal projection of the adhesive storage groove 12 onto the first battery cell end face 120 is located within the outer contour of the first battery cell end face 120. Combined with the above, it can be seen that the smooth opening of the battery cell explosion-proof valve 110 is affected by the adhesive that flows into the gap between the first battery cell end face 120 and the surface of the carrier member 1 (hereinafter referred to as the battery cell gap). Therefore, the adhesive storage groove 12 should also target this portion of the adhesive. In other words, if the adhesive flowing into the adhesive storage groove 12 is adhesive that enters the battery cell gap, the space in which the adhesive storage groove 12 accommodates this portion of the adhesive is effectively utilized; if the adhesive flowing into the adhesive storage groove 12 is adhesive outside the battery cell gap, the space in which the adhesive storage groove 12 accommodates this portion of the adhesive is not effectively utilized. It can be said that the more adhesive that enters the battery cell gap accommodated in the adhesive storage groove 12, the higher the effective utilization rate of the adhesive storage groove 12. When the adhesive reservoir groove 12 is located within the range of the first battery cell end surface 120, it can be ensured that all the adhesive that enters the adhesive reservoir groove 12 flows into the gap between the battery cells.

[0027] Exemplarily, the connection between the battery cell 100 and the carrier member 1 can be a fixed connection or a detachable connection.

[0028] For example, the starting point of the exhaust passage 300 may be the battery cell explosion-proof valve 110 of the battery cell 100 and the ending point may be the housing explosion-proof valve 221 .

[0029] For example, the support member 1 can abut against the inner bottom surface of the housing 200, or can abut against a protruding structure installed on the inner side wall of the housing 200, thereby fixing the support member 1 in position within the storage space 210.

[0030] Illustratively, the exhaust passage 300 is located between the support member 1 and the inner bottom surface of the housing 200, and / or the exhaust passage 300 is located between the support member 1 and the inner sidewall surface of the housing 200.

[0031] The battery cells 100 are placed on the carrier 1 with the first battery cell end face 120 facing the carrier 1, but because it is difficult to avoid flatness on the surface of the carrier 1 (i.e., deviation of the macroscopic unevenness of the surface of the carrier 1 from an ideal plane), there will still be a battery cell gap between the first battery cell end face 120 and the surface of the carrier 1. To prevent adhesive from flowing into the battery cell gap, in this embodiment, an adhesive storage groove 12 is provided on the side wall of the carrier 1 close to the first battery cell end face 120. When adhesive flows into the battery cell gap and toward the battery cell explosion-proof valve 110, at least a portion of it will flow into the adhesive storage groove 12, thereby achieving the purpose of preventing the adhesive from blocking the battery cell explosion-proof valve 110.

[0032] In the battery pack provided according to the embodiment of the present invention, an adhesive storage groove 12 is provided on the side wall of the carrier member 1 near the end surface 120 of the first battery cell. Even if adhesive flows into the gap between the end surface 120 of the first battery cell and the surface of the carrier member 1, at least a portion of the adhesive that flows into the gap flows into the adhesive storage groove 12. The adhesive that flows into the adhesive storage groove 12 cannot flow back toward the battery cell explosion-proof valve 110, thereby preventing the adhesive from blocking the battery cell explosion-proof valve 110 to at least a certain extent. In the event of thermal runaway of the battery cell 100, the battery cell explosion-proof valve 110 can open relatively smoothly, allowing the thermal runaway gas generated by the battery cell 100 to flow smoothly into the exhaust passage 300 through the battery cell explosion-proof valve 110 and the exhaust hole 15, preventing more serious phenomena such as large-area rupture of the battery cell 100 or the positive electrode post popping out, and ensuring the safety of the battery pack.

[0033] 2 , in some embodiments, a positioning groove 11 is provided on the side wall of the carrier member 1 away from the exhaust passage 300, with the end face 120 of the first battery cell located in the positioning groove 11 and the end face 120 of the first battery cell abutting the groove bottom of the positioning groove 11. The exhaust hole 15 and the adhesive storage groove 12 are both located at the groove bottom of the positioning groove 11, and the adhesive storage groove 12 is located between the side wall of the positioning groove 11 and the hole wall of the exhaust hole 15.

[0034] 3, which illustrates a schematic three-dimensional view of the support member 1. Along the radial direction of the positioning groove 11 (e.g., the X direction or Y direction in FIG. 3), the cross-sectional shape of the positioning groove 11 may be circular or polygonal, and the diameter of the circle or the diameter of the inscribed circle of the polygon is not smaller than the diameter of the first battery cell end surface 120.

[0035] For example, as shown in Fig. 4, Fig. 4 shows a schematic three-dimensional view of a battery cell 100 attached to a carrier member 1. The battery cell 100 and the positioning groove 11 of the carrier member 1 can be detachably connected by methods such as insertion connection or snap connection, or can be fixedly connected by methods such as adhesion.

[0036] For example, the axial direction of the exhaust hole 15 is parallel to the thickness direction of the support member 1 (such as the Z direction in FIG. 3).

[0037] By providing the positioning grooves 11 on the side wall of the support member 1 away from the exhaust passage 300, the battery cells 100 can be directly attached to the support member 1 through the positioning grooves 11, which not only facilitates assembly but also ensures that the attachment positions of the battery cells 100 on the support member 1 meet the design requirements.

[0038] At the same time, after the battery cell 100 is installed in the positioning groove 11, the position of the first battery cell end face 120 within the positioning groove 11 is relatively fixed. Therefore, locating the exhaust hole 15 at the bottom of the positioning groove 11 helps ensure that the relative position between the exhaust hole 15 and the battery cell explosion-proof valve 110 meets the design requirements, ensures that the battery cell explosion-proof valve 110 opens smoothly, and also ensures that the thermal runaway gas discharged from the battery cell explosion-proof valve 110 can smoothly enter the exhaust passage 300 through the exhaust hole 15.

[0039] Similarly, because the position of the first battery cell end face 120 within the positioning groove 11 is relatively fixed, the adhesive storage groove 12 is also located at the bottom of the positioning groove 11, which helps ensure that the relative position between the adhesive storage groove 12 and the first battery cell end face 120 meets the design requirements, helps ensure that all the adhesive flowing into the adhesive storage groove 12 is adhesive flowing into the gap between the battery cells, and helps increase the effective utilization rate of the adhesive storage groove 12.

[0040] As shown in Figure 5, Figure 5 shows a top view of the side wall of the carrier member 1 away from the exhaust passage 300. In some embodiments, the adhesive reservoir groove 12 surrounds the exhaust vent 15 to form a continuous annular groove.

[0041] Illustratively, the adhesive reservoir groove 12 may form a continuous circular groove or a continuous polygonal circular groove.

[0042] When the adhesive storage groove 12 is a continuous annular groove, no matter which direction the adhesive enters the gap of the battery cell, it will be blocked by the adhesive storage groove 12, which can effectively prevent the adhesive from blocking the battery cell explosion-proof valve 110.

[0043] As shown in Figure 6, Figure 6 shows a top view of another structure of the side wall of the carrier member 1 away from the exhaust passage 300. In some embodiments, the adhesive reservoir groove 12 surrounds the exhaust vent 15 to form an interrupted annular groove.

[0044] Illustratively, the interrupted annular grooves are evenly distributed around the exhaust vent 15 .

[0045] When the adhesive storage groove 12 is an interrupted annular groove, the groove portion can block adhesive from flowing into the gap between the battery cells, preventing the adhesive from blocking the battery cell explosion-proof valve 110. The portion between two adjacent grooves can provide effective support for the first battery cell end surface 120 of the battery cell 100, ensuring that the battery cell 100 is relatively stable within the positioning groove 11.

[0046] As shown in FIG. 5, in some embodiments, the adhesive storage groove 12 is provided at least around the exhaust hole 15 in the radial direction (for example, the X direction or Y direction in FIG. 5).

[0047] For example, as shown in FIG. 5, the adhesive reservoir groove 12 can be provided around the entire circumference.

[0048] For example, as shown in FIG. 6, the adhesive reservoir groove 12 can be provided with two or more circumferences.

[0049] For example, when the adhesive storage groove 12 is installed in at least two circumferences, the at least two circumferences of the adhesive storage groove 12 may all be continuous annular grooves, or the at least two circumferences of the adhesive storage groove 12 may all be discontinuous annular grooves, or some of the adhesive storage grooves 12 may be continuous annular grooves and other parts of the adhesive storage grooves 12 may be discontinuous annular grooves.

[0050] For example, as shown in FIG. 6, when the adhesive reservoir groove 12 is provided with at least two circular grooves, each of which is an interrupted circular groove, the groove portions of the adhesive reservoir groove 12 can be alternately distributed.

[0051] The more circumferentially the adhesive storage grooves 12 are installed, the longer the flow path along the radial direction of the positioning grooves 11 for the adhesive to reach the battery cell explosion-proof valve 110, making it more difficult for the adhesive to flow to the battery cell explosion-proof valve 110, which helps to further reduce the risk of adhesive flowing into the gaps between the battery cells and blocking the battery cell explosion-proof valve 110.

[0052] Figure 7 is an enlarged view of part A in Figure 2. In some embodiments, the groove bottom of the positioning groove 11 has a contact area 13, which is located between the wall of the exhaust hole 15 and the side wall of the adjacent adhesive storage groove 12 along the radial direction of the exhaust hole 15 (e.g., the Y direction in Figure 7), and the first battery cell end surface 120 abuts at least the contact area 13.

[0053] For example, the length of the adhesive area 13 along the radial direction of the exhaust hole 15 may be 4 mm to 7 mm.

[0054] By locating the contact area 13 between the side wall of the adhesive storage groove 12 and the wall of the exhaust hole 15, after the adhesive storage groove 12 is filled with adhesive, the contact area 13 can prevent the adhesive from overflowing in the direction of the exhaust hole 15. This is because the first battery cell end face 120 and the contact area 13 abut against each other, so the height of the gap between the first battery cell end face 120 and the surface of the contact area 13 in the direction perpendicular to the groove bottom of the positioning groove 11 (such as the Z direction in FIG. 7 ) is small, making it difficult for adhesive to enter this gap. Accordingly, it is difficult for adhesive to pass through the contact area 13 and reach the exhaust hole 15 and block the battery cell explosion-proof valve 110, effectively reducing the risk of adhesive overflowing from the adhesive storage groove 12 blocking the battery cell explosion-proof valve 110.

[0055] At the same time, the length of the adhesive area 13 along the radial direction of the exhaust hole 15 can be designed to be longer, thereby extending the flow path for the adhesive to reach the exhaust hole 15 and further reducing the risk of adhesive overflowing from the adhesive storage groove 12 passing through the adhesive area 13 and blocking the battery cell explosion-proof valve 110.

[0056] As shown in FIG. 5, in some embodiments, the sealing area 13 comprises a continuous annular area surrounding the exhaust vent 15 .

[0057] For example, the width of each portion of the adhesive area 13 along the circumferential direction of the adhesive area 13 may be the same or different.

[0058] If the adhesive area 13 is a continuous annular area, it can serve to block adhesive at each position around the vent hole 15, and no matter which direction the adhesive overflows from the adhesive storage groove 12, it must pass through the adhesive area 13 to reach the vent hole 15. The continuous arrangement of the adhesive area 13 surrounding the vent hole 15 helps to reduce the risk of adhesive overflowing from the adhesive storage groove 12 blocking the battery cell explosion-proof valve 110.

[0059] 2, in some embodiments, along a first direction (such as the Z direction in FIG. 2), the orthogonal projection of the bottom of the positioning groove 11 of the battery cell explosion-proof valve 110 is located within the outer contour of the exhaust hole 15. The first direction is perpendicular to the bottom of the positioning groove 11.

[0060] When the orthogonal projection of the positioning groove 11 of the battery cell explosion-proof valve 110 onto the groove bottom is located within the outer contour of the exhaust vent 15, it can be ensured that the adhesion area 13 does not block the battery cell explosion-proof valve 110. In the event of thermal runaway of the battery cell 100, the battery cell explosion-proof valve 110 located within the opening range of the exhaust vent 15 can open smoothly, allowing the thermal runaway gas inside the battery cell 100 to enter the exhaust vent 15 through the battery cell explosion-proof valve 110.

[0061] 7, in some embodiments, the sidewall of the positioning groove 11 and the sidewall of the adjacent adhesive storage groove 12 are spaced apart along the radial direction of the exhaust hole 15 (e.g., the Y direction in FIG. 7), forming a support area 14 at the bottom of the positioning groove 11. The support area 14 is located between the sidewall of the positioning groove 11 and the sidewall of the adjacent adhesive storage groove 12, and is used to support the end surface 120 of the first battery cell.

[0062] Illustratively, the support area 14 may be a continuous annular area surrounding the adhesive reservoir channel 12 .

[0063] For example, along the thickness direction of the carrier member 1 (such as the Z direction in FIG. 7 ), the surface height of the support area 14 is not higher than the surface height of the adhesion area 13 to ensure that the first battery cell end surface 120 abuts against the adhesion area 13.

[0064] Combining the above, the battery cell 100 can be supported by the contact area 13 on the side of the adhesive storage groove 12 closest to the exhaust hole 15. To ensure that the groove bottom of the positioning groove 11 can stably support the battery cell 100, in this embodiment, a support area 14 is provided on the side of the adhesive storage groove 12 away from the exhaust hole 15, and the support area 14 can also support the battery cell 100. In addition, the support area 14 and the contact area 13 are located on opposite sides of the adhesive storage groove 12, which ensures that the battery cell 100 is stably installed in the positioning groove 11 and prevents the battery cell 100 from tilting in the positioning groove 11, thereby preventing the battery cell 100 from increasing in a specific direction due to the gap between the battery cell 100.

[0065] 7 , in some embodiments, an adhesive member 16 is connected to the first battery cell end surface 120, and the first battery cell end surface 120 is connected to at least the support area 14 through the adhesive member 16. Of course, the first battery cell end surface 120 may also be connected to the contact area 13 through the adhesive member 16.

[0066] Illustratively, the adhesive member 16 may be formed from a hardenable fluid adhesive or may be formed from a solid adhesive.

[0067] Illustratively, the adhesive member 16 may be formed from a structural adhesive.

[0068] Illustratively, adhesive member 16 may be a continuous annular structure or an intermittent annular structure surrounding adhesive reservoir channel 12 .

[0069] After the battery cell 100 is installed in the positioning groove 11, the first battery cell end surface 120 presses the adhesive member 16, allowing the adhesive member 16 to connect with the support area 14, thereby improving the connection stability between the battery cell 100 and the carrier member 1. At the same time, the adhesive member 16 can also be used to seal the gap between the battery cells, further reducing the risk of adhesive flowing into the gap and blocking the battery cell explosion-proof valve 110.

[0070] It should also be noted that if the adhesive member 16 is a curable fluid adhesive, there is no need to precisely control the amount of fluid adhesive applied to the first battery cell end surface 120. When the battery cell 100 is pressed into the positioning groove 11, if the fluid adhesive is forced out of the support area 14 and flows toward the exhaust hole 15, the fluid adhesive can enter the adhesive storage groove 12 and not adversely affect the opening of the battery cell explosion-proof valve 110. If the fluid adhesive flows toward the groove wall of the positioning groove 11, it can seal the gap between the groove wall of the positioning groove 11 and the circumferential side wall of the battery cell 100 upward. After the fluid adhesive hardens, it acts as a barrier against the adhesive sealing the battery cell 100, further reducing the risk of the adhesive blocking the battery cell explosion-proof valve 110. The adhesive sealing the battery cell 100 may be a foam adhesive.

[0071] 7, in some embodiments, a protruding protrusion structure 17 is provided on the side wall of the carrier member 1 away from the first battery cell end surface 120. The adhesive reservoir groove 12 extends into the protrusion structure 17 along a first direction (such as the Z direction in FIG. 7).

[0072] To further reduce the risk of adhesive blocking the battery cell explosion-proof valve 110, the volume of the adhesive reservoir groove 12 can be increased. However, because the size of the battery cell explosion-proof valve 110 and the outer diameter of the battery cell 100 are both relatively fixed, it is difficult to increase the width of the adhesive reservoir groove 12 along the radial direction of the positioning groove 11. Therefore, the depth of the adhesive reservoir groove 12 can be increased.

[0073] Because the adhesive storage groove 12 is located at the bottom of the positioning groove 11, increasing the depth of the adhesive storage groove 12 requires increasing the thickness of the carrier member 1. However, increasing the overall thickness of the carrier member 1 would increase the cost of the carrier member 1 and occupy space in the exhaust passage 300. To solve these problems, the thickness of the carrier member 1 can be increased only at the position corresponding to the adhesive storage groove 12, that is, the protrusion structure 17 can be installed. By extending the adhesive storage groove 12 into the protrusion structure 17, the adhesive storage groove 12 can have a greater depth, making it less likely that adhesive that enters the gap between the battery cells will fill the adhesive storage groove 12 and therefore less likely to flow toward the battery cell explosion-proof valve 110, thereby avoiding blocking the battery cell explosion-proof valve 110.

[0074] Each embodiment of the present invention is described in a step-by-step manner, and the emphasis in each embodiment is on the differences from other embodiments, and identical or similar parts between each embodiment can be cross-referenced.

[0075] The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The selection and description of the embodiments is intended to better explain the principles and practical applications of the invention, and to enable those of ordinary skill in the art to understand the invention and thereby design various embodiments with various modifications suitable for particular applications.

[0076] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative, and that the scope of the present disclosure (including the claims) is not intended to be limited to these examples; that, under the concept of the present invention, technical features of the above embodiments or different embodiments can be combined, steps can be performed in any order, and that there are many other variations of different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0077] While the present invention has been described in connection with specific embodiments thereof, it is understood that many permutations, modifications and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description.

[0078] The embodiments of the present invention are intended to encompass all such replacements, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should also fall within the protection scope of the present invention. [Industrial Applicability]

[0079] The battery pack of the present invention can be applied in the field of power battery technology. [Explanation of symbols]

[0080] 1: Supporting member 11: Positioning groove 12: Adhesive storage groove 13: Close contact area 14: Support Area 15: Exhaust vent 16: Adhesive material 17: Protrusion structure 100: Battery cell 110: Battery cell explosion-proof valve 120: First battery cell end face 200: Cabinet 210: Containment Space 220: Side panel 221: Housing explosion-proof valve 230: Bottom plate 300: Exhaust passage

Claims

1. a plurality of battery cells each having a battery cell explosion-proof valve, the surface on which the battery cell explosion-proof valve is located being defined as a first battery cell end surface; a housing in which the plurality of battery cells are all installed; a support member at least a portion of which is disposed between the inner surface of the housing and the battery cell, and which defines an exhaust passage between the support member and the inner surface of the housing; the battery cells are mounted on the support member, an end face of the first battery cell faces the support member, the support member is provided with an exhaust hole corresponding to the battery cell explosion-proof valve, the exhaust hole is connected to the exhaust passage, and an adhesive storage groove is provided on a side wall of the support member close to the end face of the first battery cell.

2. a positioning groove is formed in a side wall of the support member away from the exhaust passage, and an end surface of the first battery cell is positioned in the positioning groove; 2. The battery pack of claim 1, wherein the exhaust hole and the adhesive storage groove are both located at the bottom of the positioning groove, and the adhesive storage groove is located between the side wall of the positioning groove and the hole wall of the exhaust hole.

3. The battery pack according to claim 1 , wherein the adhesive reservoir groove surrounds the exhaust hole and presents a continuous annular groove or an intermittent annular groove.

4. The battery pack according to claim 3 , wherein the adhesive reservoir groove is provided at least once around the vent hole in a radial direction.

5. 3. The battery pack of claim 2, wherein a groove bottom of the positioning groove has a contact area, the contact area is located along the radial direction of the exhaust hole between the hole wall of the exhaust hole and the adjacent side wall of the adhesive storage groove, and an end face of the first battery cell abuts at least the contact area.

6. The battery pack according to claim 5 , wherein the contact area includes a continuous annular area surrounding the exhaust hole.

7. 6. The battery pack according to claim 5, wherein an orthogonal projection of the battery cell explosion-proof valve onto the groove bottom of the positioning groove is located within the outer contour of the exhaust hole along a first direction, and the first direction is perpendicular to the groove bottom of the positioning groove.

8. 3. The battery pack of claim 2, wherein a side wall of the positioning groove and an adjacent side wall of the adhesive storage groove are spaced apart along the radial direction of the exhaust hole to form a support area at the groove bottom of the positioning groove, the support area being located between the side wall of the positioning groove and the adjacent side wall of the adhesive storage groove, and the support area being used to support an end face of the first battery cell.

9. The battery pack according to claim 8 , wherein an adhesive member is connected to an end surface of the first battery cell, and the end surface of the first battery cell is connected to at least the support area through the adhesive member.

10. 2. The battery pack according to claim 1, wherein a protruding protrusion structure is provided on a side wall of the support member away from the end face of the first battery cell, and the adhesive storage groove extends into the protrusion structure along a first direction, the first direction being perpendicular to the end face of the first battery cell.

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