Battery pack

Abstract

The utility model provides a battery pack which comprises a plurality of battery cells, the battery cells are provided with battery cell anti-explosion valves, and the surfaces where the battery cell anti-explosion valves are located are defined as first battery cell end faces; the plurality of battery cells are arranged in the box body; at least part of the bearing part is arranged between the inner surface of the box body and the battery core, so that an exhaust channel is defined between the bearing part and the inner surface of the box body; the battery cell is arranged on the bearing part, the end face of the first battery cell faces the bearing part, the bearing part is provided with an exhaust through hole corresponding to the battery cell anti-explosion valve, and the exhaust through hole is communicated with the exhaust channel; a glue storage groove is formed in the side wall, close to the end face of the first battery cell, of the bearing part. According to the battery pack provided by the invention, the glue storage groove is formed in the side wall, close to the end face of the first battery cell, of the bearing part, and even if glue flows into the gap between the end face of the first battery cell and the surface of the bearing part, at least part of the glue flowing into the gap can flow into the glue storage groove, so that the glue is prevented from shielding the battery cell explosion-proof valve at least to a certain extent; and the safety of the battery pack is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery pack. Background Art

[0002] In the prior art solution, the battery pack includes a box body and a plurality of battery cells installed in the box body, and each battery cell has a battery cell explosion-proof valve. When the battery cell is a cylindrical battery cell, its battery cell explosion-proof valve is located at the bottom of the battery cell. After the battery cell and the box body are assembled, glue is poured into the box body, and there is a risk that the glue will block the battery cell explosion-proof valve during the flowing process. After the glue blocking the battery cell explosion-proof valve solidifies, it will affect the smooth opening of the battery cell explosion-proof valve when the battery cell has a thermal runaway, and then cause the gas to be blocked inside the battery cell, resulting in more serious phenomena such as large-area rupture or the positive electrode post flying out, thus affecting the safety of the battery pack. Summary of the Utility Model

[0003] In view of this, the purpose of the present utility model is to provide a battery pack to solve the problem that the glue blocks the battery cell explosion-proof valve and affects the opening and exhaust of the battery cell explosion-proof valve, so as to ensure the safety of the battery pack.

[0004] Based on the above purpose, the present application provides a battery pack, including: a plurality of battery cells, the battery cells having battery cell explosion-proof valves, and the surface where the battery cell explosion-proof valves are located is defined as the first battery cell end face; a box body, a plurality of the battery cells are all arranged in the box body; a carrier, at least part of which is arranged between the inner surface of the box body and the battery cells to define an exhaust passage between the carrier and the inner surface of the box body; the battery cells are arranged on the carrier and the first battery cell end face faces the carrier, the carrier is provided with exhaust through holes corresponding to the battery cell explosion-proof valves, and the exhaust through holes are communicated with the exhaust passage; a glue storage groove is arranged on a side wall of the carrier close to the first battery cell end face.

[0005] Optionally, a positioning groove is arranged on a side wall of the carrier away from the exhaust passage, and the first battery cell end face is arranged in the positioning groove; the exhaust through holes and the glue storage groove are both arranged at the bottom of the positioning groove, and the glue storage groove is located between the side wall of the positioning groove and the hole wall of the exhaust through hole.

[0006] Optionally, the glue storage groove is a continuous annular groove or a discontinuous annular groove surrounding the exhaust through hole.

[0007] Optionally, along the radial direction of the exhaust through hole, the glue storage groove is provided with at least one circle.

[0008] Optionally, the bottom of the positioning groove has a fitting area. Along the radial direction of the exhaust through-hole, the fitting area is located between the hole wall of the exhaust through-hole and the side wall of the adjacent glue storage groove, and the first end face of the battery cell abuts at least against the fitting area.

[0009] Optionally, the fitting area includes a continuous annular area surrounding the exhaust through-hole.

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

[0011] Optionally, along the radial direction of the exhaust through-hole, the side wall of the positioning groove and the side wall of the adjacent glue storage groove are spaced apart to construct a support area on the bottom of the positioning groove. The support area is located between the side wall of the positioning groove and the side wall of the adjacent glue storage groove, and the support area is used to support the first end face of the battery cell.

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

[0013] Optionally, a protruding raised structure is provided on a side wall of the carrier away from the first end face of the battery cell; along a first direction, the glue storage groove extends into the interior of the raised structure; the first direction is perpendicular to the first end face of the battery cell.

[0014] As can be seen from the above, in the battery pack provided by the present application, a glue storage groove is provided on a side wall of the carrier close to the first end face of the battery cell. Even if glue flows into the gap between the first end face of the battery cell and the surface of the carrier, at least part of the glue flowing into the gap will flow into the glue storage groove, and the glue flowing into the glue storage groove cannot flow to the battery cell explosion-proof valve anymore, thereby preventing the glue from blocking the battery cell explosion-proof valve to at least a certain extent. When the battery cell undergoes thermal runaway, the battery cell explosion-proof valve can be opened more smoothly, so that the thermal runaway gas generated by the battery cell can flow smoothly into the exhaust passage through the battery cell explosion-proof valve and the exhaust through-hole, avoiding more severe phenomena such as large-area rupture of the battery cell or flying out of the positive electrode post, to ensure the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Schematic perspective view of a partial structure of the battery pack according to an embodiment of the present application;

[0017] Figure 2 Schematic cross-sectional view of a partial structure of the battery pack according to an embodiment of the present application;

[0018] Figure 3 Schematic perspective view of the carrier of the battery pack according to an embodiment of the present application;

[0019] Figure 4 Schematic perspective view of the battery cell of the battery pack according to an embodiment of the present application mounted on the carrier;

[0020] Figure 5 Top view of the side wall of the carrier of the battery pack according to an embodiment of the present application away from the exhaust passage;

[0021] Figure 6 Another top view of the side wall of the carrier of the battery pack according to an embodiment of the present application away from the exhaust passage;

[0022] Figure 7 is Figure 2 Enlarged view of part A in

[0023] Explanation of reference numerals:

[0024] 1. Carrier; 11. Positioning groove; 12. Glue storage groove; 13. Bonding area; 14. Support area; 15. Exhaust through hole; 16. Bonding member; 17. Protrusion structure;

[0025] 100. Battery cell; 110. Battery cell explosion-proof valve; 120. First battery cell end face;

[0026] 200. Box body; 210. Accommodating space; 220. Side plate; 221. Box body explosion-proof valve; 230. Bottom plate; 300. Exhaust passage. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0028] It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions and numerical values of the components described in these embodiments do not limit the scope of the present application.

[0029] Meanwhile, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present application and its application or use.

[0031] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present utility model should have the ordinary meanings understood by those of ordinary skill in the art to which this disclosure pertains. The "first", "second" and similar terms used in this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0032] As Figure 1 , Figure 1 shows a perspective schematic diagram of a partial structure of a battery pack. The battery pack may include a box body 200, and the box body 200 may include a bottom plate 230 and four side plates 220 connected to the edge of the bottom plate 230. The bottom plate 230 and the four side plates 220 enclose and define an accommodation space 210 inside the box body 200. The battery pack further includes a plurality of battery cells 100 installed in the accommodation space 210, and the battery cells 100 may be cylindrical battery cells.

[0033] As Figure 1 , a box body explosion-proof valve 221 is installed on the side plate 220 of the box body 200. As Figure 2 , Figure 2 shows a partial cross-sectional schematic diagram of the battery pack. When the battery cell 100 is a cylindrical battery cell, its battery cell explosion-proof valve 110 may be located at the bottom of the battery cell 100, close to the bottom plate 230 of the box body 200. When a thermal runaway occurs in the battery cell 100, the box body explosion-proof valve 221 will open, and the hot gas ejected from the battery cell explosion-proof valve 110 will flow towards the direction of the box body explosion-proof valve 221 and be discharged outside the box body 200 through the box body explosion-proof valve 221.

[0034] After the battery cell 100 is installed in the accommodation space 210 of the box body 200, it is also necessary to pour adhesive into the accommodation space 210 to encapsulate the battery cell 100 in the box body 200. The applicant's research found that since 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 flow into this gap after entering the accommodation space 210 and spread to the explosion-proof valve 110 of the battery cell, covering the explosion-proof valve 110 of the battery cell. The adhesive covering the explosion-proof valve 110 of the battery cell will be connected to the bottom of the battery cell 100 after curing and form a structure with a certain strength. When the battery cell 100 undergoes thermal runaway, the structure formed by the adhesive covering the explosion-proof valve 110 of the battery cell will prevent the explosion-proof valve 110 from opening smoothly, and then cause the thermal runaway gas to be blocked inside the battery cell 100, which may cause more severe phenomena such as large-area rupture of the battery cell 100 or flying out of the positive electrode post, affecting the safety of the battery pack.

[0035] In view of this, as Figure 2 , in some embodiments, the battery pack includes a box body 200, a carrier 1, and a plurality of battery cells 100. The battery cell 100 has an explosion-proof valve 110 of the battery cell, and the surface where the explosion-proof valve 110 is located is defined as the first battery cell end face 120; a plurality of battery cells 100 are all arranged inside the box body 200; the carrier 1 is at least partially arranged between the inner surface of the box body 200 and the battery cell 100 to define an exhaust passage 300 between the carrier 1 and the inner surface of the box body 200; the battery cell 100 is arranged on the carrier 1 and the first battery cell end face 120 faces the carrier 1, and the carrier 1 is provided with an exhaust through hole 15 corresponding to the explosion-proof valve 110 of the battery cell, and the exhaust through hole 15 is communicated with the exhaust passage 300; a glue storage groove 12 is arranged on a side wall of the carrier 1 close to the first battery cell end face 120.

[0036] Exemplarily, along the axial direction of the battery cell 100 (such as Figure 2 the Z direction in ), the orthographic projection of the glue storage groove 12 on the first battery cell end face 120 is located within the outer contour of the first battery cell end face 120. Combining the foregoing content, it can be seen that the adhesive that affects the smooth opening of the explosion-proof valve 110 of the battery cell is the adhesive flowing into the gap between the first battery cell end face 120 and the surface of the carrier 1 (hereinafter referred to as the battery cell gap), so the glue storage groove 12 should also be aimed at this part of the adhesive. In other words, if the adhesive flowing into the glue storage groove 12 is the adhesive entering the battery cell gap, then the space in the glue storage groove 12 for accommodating this part of the adhesive is the effectively utilized space, and if the adhesive flowing into the glue storage groove 12 is the adhesive outside the battery cell gap, then the space in the glue storage groove 12 for accommodating this part of the adhesive is the ineffectively utilized space. The more the adhesive entering the battery cell gap is accommodated in the glue storage groove 12, the higher the effective utilization rate of the glue storage groove 12 can be said to be. If the glue storage groove 12 is located within the range of the first battery cell end face 120, then it can be ensured that the adhesive flowing into the glue storage groove 12 is the adhesive flowing into the battery cell gap.

[0037] Exemplarily, the battery cell 100 and the carrier 1 may be fixedly connected or detachably connected.

[0038] Exemplarily, 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 box body explosion-proof valve 221.

[0039] Exemplarily, the carrier 1 may be in contact with the inner bottom surface of the box body 200, or in contact with the protruding structure provided on the inner side wall of the box body 200, so that the position of the carrier 1 in the accommodation space 210 is fixed.

[0040] Exemplarily, the exhaust passage 300 is located between the carrier 1 and the inner bottom surface of the box body 200, and / or the exhaust passage 300 is located between the carrier 1 and the inner side wall surface of the box body 200.

[0041] Although the battery cell 100 is disposed on the carrier 1 and the first battery cell end face 120 faces the carrier 1, due to the inevitable flatness of the surface of the carrier 1 (i.e., the deviation of the macroscopic uneven height of the surface of the carrier 1 relative to the 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. In order to intercept the adhesive flowing into the battery cell gap, in this embodiment, a glue storage groove 12 is provided on a side wall of the carrier 1 close to the first battery cell end face 120. During the process of the adhesive flowing into the battery cell gap flowing towards the battery cell explosion-proof valve 110, at least part of it will flow into the glue storage groove 12, so as to prevent the adhesive from blocking the battery cell explosion-proof valve 110.

[0042] In the battery pack provided by the embodiment of the present application, a glue storage groove 12 is provided on a side wall of the carrier 1 close to the first battery cell end face 120. Even if the adhesive flows into the gap between the first battery cell end face 120 and the surface of the carrier 1, at least part of the adhesive flowing into the gap will flow into the glue storage groove 12, and the adhesive flowing into the glue storage groove 12 cannot flow towards the battery cell explosion-proof valve 110 anymore, thereby at least to a certain extent preventing the adhesive from blocking the battery cell explosion-proof valve 110. When the battery cell 100 undergoes thermal runaway, the battery cell explosion-proof valve 110 can be opened more smoothly, so that the thermal runaway gas generated by the battery cell 100 can flow into the exhaust passage 300 smoothly through the battery cell explosion-proof valve 110 and the exhaust through hole 15, avoiding more serious phenomena such as large-area rupture of the battery cell 100 or flying out of the positive electrode post, so as to ensure the safety of the battery pack.

[0043] Such as Figure 2, in some embodiments, a positioning groove 11 is provided on a side wall of the carrier 1 away from the exhaust passage 300. The first end face 120 of the battery cell is disposed in the positioning groove 11 and abuts against the bottom of the positioning groove 11; both the exhaust through-hole 15 and the glue storage groove 12 are provided at the bottom of the positioning groove 11, and the glue storage groove 12 is located between the side wall of the positioning groove 11 and the hole wall of the exhaust through-hole 15.

[0044] Exemplarily, such as Figure 3 , Figure 3 shows a three-dimensional schematic diagram of the carrier 1. Along the radial direction of the positioning groove 11 (e.g., Figure 3 the X direction or the Y direction in

[0045] Exemplarily, such as Figure 4 , Figure 4 shows a three-dimensional schematic diagram of the battery cell 100 mounted on the carrier 1. The battery cell 100 and the positioning groove 11 of the carrier 1 can be detachably connected by means of plugging or clamping, etc., or fixedly connected by means of bonding, etc.

[0046] Exemplarily, the axial direction of the exhaust through-hole 15 is parallel to the thickness direction of the carrier 1 (such as Figure 3 the Z direction in

[0047] Providing the positioning groove 11 on the side wall of the carrier 1 away from the exhaust passage 300 enables the battery cell 100 to be directly mounted on the carrier 1 through the positioning groove 11, which is not only convenient for assembly but also can ensure that the mounting position of the battery cell 100 on the carrier 1 meets the design requirements.

[0048] At the same time, after the battery cell 100 is installed in the positioning groove 11, since the position of the first end face 120 of the battery cell in the positioning groove 11 is relatively fixed, therefore, arranging the exhaust through-hole 15 at the bottom of the positioning groove 11 can help ensure that the relative position between the exhaust through-hole 15 and the explosion-proof valve 110 of the battery cell meets the design requirements, ensure that the explosion-proof valve 110 of the battery cell can be opened smoothly, and also ensure that the thermal runaway gas discharged from the explosion-proof valve 110 of the battery cell can smoothly enter the exhaust passage 300 through the exhaust through-hole 15.

[0049] Similarly, since the position of the first end face 120 of the battery cell in the positioning groove 11 is relatively fixed, then arranging the glue storage groove 12 at the bottom of the positioning groove 11 can help ensure that the relative position between the glue storage groove 12 and the first end face 120 of the battery cell meets the design requirements, help ensure that the glue flowing into the glue storage groove 12 is all the glue flowing into the gaps of the battery cell, and help improve the effective utilization rate of the glue storage groove 12.

[0050] Such as Figure 5 ,Figure 5 Shows a top - view schematic diagram of the side wall of the carrier 1 away from the side wall of the exhaust passage 300. In some embodiments, the glue storage groove 12 is a continuous annular groove around the exhaust through - hole 15.

[0051] Exemplarily, the glue storage groove 12 can be a continuous circular - ring - shaped groove or a continuous polygon - shaped annular groove.

[0052] When the glue storage groove 12 is a continuous annular groove, no matter from which direction the glue enters the cell gap, it will be intercepted by the glue storage groove 12, effectively avoiding the glue from blocking the cell explosion - proof valve 110.

[0053] Such as Figure 6 , Figure 6 Shows another top - view schematic diagram of the side wall of the carrier 1 away from the side wall of the exhaust passage 300. In some embodiments, the glue storage groove 12 is a discontinuous annular groove around the exhaust through - hole 15.

[0054] Exemplarily, the discontinuous annular grooves are evenly distributed around the exhaust through - hole 15.

[0055] When the glue storage groove 12 is a discontinuous annular groove, the groove part can intercept the glue flowing into the cell gap to avoid the glue from blocking the cell explosion - proof valve 110; the part between two adjacent grooves can effectively support the first cell end face 120 of the cell 100, ensuring that the cell 100 is relatively stable in the positioning groove 11.

[0056] Such as Figure 5 , in some embodiments, along the radial direction of the exhaust through - hole 15 (for example, the X - direction or Y - direction in Figure 5 ), the glue storage groove 12 is provided with at least one circle.

[0057] Exemplarily, such as Figure 5 , the glue storage groove 12 can be provided with one circle.

[0058] Exemplarily, such as Figure 6 , the glue storage groove 12 can be provided with two circles or more.

[0059] Exemplarily, when the glue storage groove 12 is provided with at least two circles, at least two circles of the glue storage groove 12 can all be continuous annular grooves, or at least two circles of the glue storage groove 12 can all be discontinuous annular grooves, or some of the glue storage grooves 12 are continuous annular grooves and some are discontinuous annular grooves.

[0060] Exemplarily, such as Figure 6 , when the glue storage groove 12 is provided with at least two circles and all are discontinuous annular grooves, the groove parts of the glue storage groove 12 can be stagger - distributed.

[0061] The more turns the glue storage groove 12 is provided with, the longer the flow path of the glue agent to the explosion-proof valve 110 of the battery cell along the radial direction of the positioning groove 11, and the more difficult it is for the glue agent to flow to the explosion-proof valve 110 of the battery cell, which helps to further reduce the risk of the glue agent flowing into the gaps of the battery cell and blocking the explosion-proof valve 110.

[0062] Such as Figure 7 , Figure 7 is Figure 2 an enlarged schematic view of part A in Figure 7 . In some embodiments, the bottom of the positioning groove 11 has a fitting area 13. Along the radial direction of the exhaust through-hole 15 (for example Figure 7 the Y direction in ), the fitting area 13 is located between the hole wall of the exhaust through-hole 15 and the side wall of the adjacent glue storage groove 12, and the first battery cell end face 120 abuts at least against the fitting area 13.

[0063] Exemplarily, along the radial direction of the exhaust through-hole 15, the length of the fitting area 13 can be 4 mm to 7 mm.

[0064] By arranging the fitting area 13 between the side wall of the glue storage groove 12 and the hole wall of the exhaust through-hole 15, when the glue storage groove 12 is filled with glue agent, the fitting area 13 can prevent the glue agent from overflowing towards the direction of the exhaust through-hole 15. This is because the first battery cell end face 120 abuts against the fitting area 13, so along the direction perpendicular to the bottom of the positioning groove 11 (such as Figure 7 the Z direction in ), the gap height between the first battery cell end face 120 and the surface of the fitting area 13 is small, and it is not easy for the glue agent to enter this gap. Correspondingly, it is not easy for the glue agent to pass through the fitting area 13 to reach the exhaust through-hole 15 and block the explosion-proof valve 110, which can effectively reduce the risk of the glue agent overflowing from the glue storage groove 12 and blocking the explosion-proof valve 110.

[0065] At the same time, the length of the fitting area 13 along the radial direction of the exhaust through-hole 15 can also be designed to be longer, so as to extend the flow path of the glue agent to reach the exhaust through-hole 15, which can further reduce the risk of the glue agent overflowing from the glue storage groove 12 and passing through the fitting area 13 to block the explosion-proof valve 110.

[0066] Such as Figure 5 , in some embodiments, the fitting area 13 includes a continuous annular area surrounding the exhaust through-hole 15.

[0067] Exemplarily, along the circumferential direction of the fitting area 13, the widths of various parts of the fitting area 13 can be the same or different.

[0068] When the bonding area 13 is a continuous annular area, it can block the adhesive at various positions in the circumferential direction of the exhaust through-hole 15. No matter from which direction the adhesive overflows from the glue storage tank 12, it needs to pass through the bonding area 13 to reach the exhaust through-hole 15. The continuous arrangement of the bonding area 13 around the exhaust through-hole 15 helps to reduce the risk that the adhesive overflowing from the glue storage tank 12 blocks the explosion-proof valve 110 of the battery cell.

[0069] For example Figure 2 , in some embodiments, along the first direction (such as Figure 2 the Z direction in

[0070] ), the orthographic projection of the explosion-proof valve 110 of the battery cell on the bottom of the positioning groove 11 is located within the outer contour of the exhaust through-hole 15; the first direction is perpendicular to the bottom of the positioning groove 11.

[0071] For example Figure 7 , in some embodiments, along the radial direction of the exhaust through-hole 15 (for example Figure 7 the Y direction in

[0072] ), the side wall of the positioning groove 11 and the side wall of the adjacent glue storage tank 12 are spaced apart to construct a support area 14 at the bottom of the positioning groove 11. The support area 14 is located between the side wall of the positioning groove 11 and the side wall of the adjacent glue storage tank 12, and the support area 14 is used to support the first end face 120 of the battery cell.

[0073] Exemplarily, the support area 14 can be a continuous annular area surrounding the glue storage tank 12. Figure 7 Exemplarily, along the thickness direction of the carrier 1 (such as

[0074] As described above, on one side of the glue storage tank 12 close to the exhaust through hole 15, the battery cell 100 can be supported by the bonding area 13. In order to ensure that the bottom of the positioning groove 11 can reliably and stably support the battery cell 100, in this embodiment, a support area 14 is provided on the side of the glue storage tank 12 away from the exhaust through hole 15. The support area 14 can also support the battery cell 100, and the support area 14 and the bonding area 13 are located on opposite sides of the glue storage tank 12, which can ensure that the battery cell 100 is stably installed in the positioning groove 11 and prevent the gap between the battery cells in a certain direction from becoming larger due to the inclination of the battery cell 100 in the positioning groove 11.

[0075] As Figure 7 , in some embodiments, an adhesive member 16 is connected to the first battery cell end face 120, and the first battery cell end face 120 is connected to at least the support area 14 through the adhesive member 16. Of course, the first battery cell end face 120 can also be connected to the bonding area 13 through the adhesive member 16.

[0076] Exemplarily, the adhesive member 16 can be formed by a curable fluid adhesive or a solid adhesive.

[0077] Exemplarily, the adhesive member 16 can be formed by a structural adhesive.

[0078] Exemplarily, the adhesive member 16 can be a continuous annular structure or a discontinuous annular structure around the glue storage tank 12.

[0079] After the battery cell 100 is installed in the positioning groove 11, the first battery cell end face 120 can extrude the adhesive member 16 to connect the adhesive member 16 with the support area 14, thereby improving the connection stability between the battery cell 100 and the carrier 1. At the same time, the adhesive member 16 can also be used to block the battery cell gap to further reduce the risk of the glue flowing into the battery cell gap and blocking the explosion-proof valve 110 of the battery cell.

[0080] It should also be noted that when the adhesive member 16 is a curable fluid adhesive, precise control of the dosage may not be required when applying the fluid adhesive to the first battery cell end face 120. When the battery cell 100 is extruded into the positioning groove 11, if the fluid adhesive flows in the direction of the exhaust through hole 15 after being extruded out of the support area 14, then the fluid adhesive can enter the glue storage tank 12 and will not have an adverse effect on the opening of the explosion-proof valve 110 of the battery cell; if the fluid adhesive flows in the direction of the groove wall of the positioning groove 11, then the fluid adhesive can upwardly block the gap between the groove wall of the positioning groove 11 and the circumferential side wall of the battery cell 100. After the fluid adhesive cures, it can also play a role in blocking the glue for encapsulating the battery cell 100, further reducing the risk of the glue blocking the explosion-proof valve 110 of the battery cell. Among them, the glue for encapsulating the battery cell 100 can be a foaming glue.

[0081] As Figure 7, in some embodiments, a protruding raised structure 17 is provided on a side wall of the carrier 1 away from the end face 120 of the first battery cell; along the first direction (such as the Z direction in Figure 7 ), the glue storage groove 12 extends into the interior of the raised structure 17.

[0082] In order to further reduce the risk of the glue covering the explosion-proof valve 110 of the battery cell, the capacity of the glue storage groove 12 can be increased. However, since the sizes of the explosion-proof valve 110 of the battery cell and the outer diameter of the battery cell 100 are relatively fixed, it is difficult to increase the width of the glue storage groove 12 along the radial direction of the positioning groove 11. Therefore, the depth of the glue storage groove 12 can be increased.

[0083] Since the glue storage groove 12 is provided at the bottom of the positioning groove 11, in order to increase the depth of the glue storage groove 12, the thickness of the carrier 1 needs to be increased. However, if the overall thickness of the carrier 1 is increased, on the one hand, the cost of the carrier 1 will be relatively high, and on the other hand, the space of the exhaust passage 300 will also be occupied. To solve the above problems, the thickness of the carrier 1 can be increased only at the position corresponding to the glue storage groove 12, that is, the raised structure 17 is provided. After the glue storage groove 12 extends into the interior of the raised structure 17, the glue storage groove 12 can have a larger depth, and the glue entering the gap of the battery cell is not easy to fill the glue storage groove 12. Correspondingly, it is not easy to flow to the explosion-proof valve 110 of the battery cell to avoid covering the explosion-proof valve 110 of the battery cell.

[0084] In the present application, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0085] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present application, and enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0086] Those of ordinary skill in the art should understand that: the discussion of any above embodiment is only exemplary, and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the concept of the present invention, the technical features between the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0087] Although the present application has been described in connection with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.

[0088] Embodiments of the present utility model are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that: include: A plurality of battery cells, each of which has a battery cell explosion-proof valve, and a surface where the battery cell explosion-proof valve is located is defined as a first battery cell end surface; A box body, wherein the plurality of battery cells are arranged in the box body; A carrier is at least partially arranged between the inner surface of the box and the battery cell to define an exhaust channel between the carrier and the inner surface of the box; the battery cell is arranged on the carrier and the first battery cell end face faces the carrier, the carrier is provided with an exhaust through hole corresponding to the battery cell explosion-proof valve, and the exhaust through hole is connected to the exhaust channel; a side wall of the carrier close to the first battery cell end face is provided with a glue storage tank.

2. The battery pack according to claim 1, characterized in that: A positioning groove is provided on one side wall of the carrier away from the exhaust channel, and the first battery cell end face is arranged in the positioning groove; the exhaust through hole and the glue storage groove are both arranged at the bottom of the positioning groove, and the glue storage groove is located between the side wall of the positioning groove and the hole wall of the exhaust through hole.

3. The battery pack according to claim 1, characterized in that: The glue storage groove is a continuous annular groove or a discontinuous annular groove surrounding the exhaust through hole.

4. The battery pack according to claim 3, characterized in that: The glue storage tank is provided with at least one circle along the radial direction of the exhaust through hole.

5. The battery pack according to claim 2, characterized in that: The bottom of the positioning groove has a fitting area, and along the radial direction of the exhaust through hole, the fitting area is located between the hole wall of the exhaust through hole and the side wall of the adjacent glue storage groove, and the end face of the first battery cell at least abuts against the fitting area.

6. The battery pack according to claim 5, characterized in that: The fitting area includes a continuous annular area surrounding the exhaust through hole.

7. The battery pack according to claim 5, characterized in that: Along a first direction, the orthographic projection of the battery core explosion-proof valve at the bottom of the positioning groove is located within the outer contour of the exhaust through hole; the first direction is perpendicular to the bottom of the positioning groove.

8. The battery pack according to claim 2, characterized in that: Along the radial direction of the exhaust hole, the side wall of the positioning groove is spaced apart from the side wall of the adjacent glue storage groove to construct a support area at the bottom of the positioning groove. The support area is located between the side wall of the positioning groove and the side wall of the adjacent glue storage groove. The support area is used to support the end face of the first battery cell.

9. The battery pack according to claim 8, characterized in that: The first battery cell end surface is connected to an adhesive component, and the first battery cell end surface is connected to at least the supporting area through the adhesive component.

10. The battery pack according to claim 1, characterized in that: A protruding convex structure is provided on a side wall of the carrier away from the first battery cell end face; along a first direction, the glue storage tank extends to the inside of the protruding structure; and the first direction is perpendicular to the first battery cell end face.

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