Battery pack heat dissipation structure and battery pack

Abstract

The utility model relates to a battery pack heat dissipation structure and a battery pack, the battery pack heat dissipation structure comprises a plurality of heat dissipation fins and fixing parts, the heat dissipation fins are clamped between two adjacent battery cells, the fixing parts are arranged at the edges of the heat dissipation fins, and the fixing parts are used for clamping the heat dissipation fins and the battery cells in the battery pack. According to the battery cell unit, the edges of the cooling fins are fixed through the fixing pieces, the battery cells are fixed to the sides, located on the cooling fins, of the fixing pieces, and the portions, not fixed by the fixing pieces, of the cooling fins can conduct heat conduction and heat dissipation on the battery cells, so that compared with the mode that the fixing frame, the cooling fins and the battery cells are stacked, the thickness of the battery cell unit is reduced, and the battery cell unit is more compact. Therefore, the thickness of the battery pack formed by the battery cell units is reduced, and the large energy density of the battery pack is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery pack heat dissipation structure and a battery pack. Background Art

[0002] A battery pack is made up of several stacked cells and can power devices with high power demand. Since battery packs tend to generate heat during use, a heat dissipation structure is usually set on the battery pack to reduce the possibility of excessive temperature affecting the performance of the battery pack.

[0003] In the related art, a battery pack includes a plurality of battery cell units stacked along its thickness direction, and each battery cell unit includes a fixing frame, a heat dissipation structure and a battery cell unit stacked in sequence. The heat dissipation structure is a plurality of heat sinks arranged in the battery pack, and the heat sinks are in contact with the battery cell units, and can timely discharge the heat in the battery pack. However, such a stacking structure makes the battery pack large in size and has a low energy density per unit volume. Therefore, there is an urgent need for a battery pack heat dissipation structure that can solve the above technical problems. Utility Model Content

[0004] Based on this, it is necessary to provide a battery pack heat dissipation structure and a battery pack to address the problem that the battery pack heat dissipation structure in the related art affects the battery pack volume and energy density.

[0005] In a first aspect, the present application provides a battery pack heat dissipation structure, which is applied to a battery pack, wherein the battery pack includes a plurality of battery cells stacked in sequence along its length direction, and the battery pack heat dissipation structure includes:

[0006] A plurality of heat sinks are sandwiched between two adjacent battery cells;

[0007] The fixing piece is arranged at the edge of the heat sink and is used to clamp the heat sink and the battery cell in the battery pack.

[0008] In one embodiment, the fixing member is a plurality of groups of fixing frames corresponding to the heat sinks one by one, each group of fixing frames includes two fixing brackets, and the heat sink is sandwiched between the two fixing brackets in the same group.

[0009] In one embodiment, mounting grooves are provided on opposite side walls of two fixing brackets in the same group, one end of the heat sink is plugged into one of the mounting grooves in the same group, and the other end of the heat sink is plugged into another mounting groove in the same group.

[0010] In one embodiment, a receiving groove for accommodating the end of the battery cell is provided on the fixing bracket, and a clearance groove is provided on the side wall of the receiving groove away from the heat sink, and the clearance groove is used to allow the pole ear at the end of the battery cell to extend out of the receiving groove.

[0011] In one of the embodiments, the battery cell includes two main surfaces, a side surface and a bottom surface, and the heat sink includes a first heat conducting part and two second heat conducting parts located at both ends of the first heat conducting part, the first heat conducting part is pressed against the main surface of the battery cell, one of the second heat conducting parts is pressed against one of the bottom surfaces of the battery cell, and the other second heat conducting part is pressed against the other bottom surface of the battery cell.

[0012] In one of the embodiments, the heat sink further includes a heat dissipation portion, which is disposed on one of the second heat conducting portions, and a height of the heat dissipation portion is higher than a height of the fixing frame.

[0013] In one embodiment, the heat dissipation portion has a length greater than that of the first heat conducting portion and the second heat conducting portion, and is aligned with the center of the battery core.

[0014] In one embodiment, the heat dissipation portion includes a bottom plate and a plurality of heat dissipation grids. The bottom plate is disposed on the second heat conducting portion abutting against the top surface of the battery core, and the heat dissipation grids are disposed on the upper surface of the bottom plate.

[0015] In one of the embodiments, a heat conducting member is sandwiched between the heat sink and the battery core, and the heat conducting member is tightly pressed against both the battery core and the heat sink.

[0016] In a second aspect, the present application provides a battery pack, comprising any one of the battery pack heat dissipation structures provided in the first aspect, and the battery pack also includes a plurality of battery cells stacked sequentially along its length direction.

[0017] The above-mentioned battery pack heat dissipation structure and battery pack, wherein the battery pack heat dissipation structure includes a plurality of heat sinks and fixings, the heat sink is clamped between two adjacent battery cells, the fixings are arranged at the edge of the heat sink, and the fixings are used to clamp the heat sink and the battery cell in the battery pack. The present application fixes the edge of the heat sink by the fixings, and fixes the battery cell on the fixings on one side of the heat sink, and the portion of the heat sink not fixed by the fixings can conduct heat to the battery cell. Such a setting reduces the thickness of the battery cell unit relative to the stacking of the fixing frame, the heat sink and the battery cell, thereby reducing the thickness of the battery pack composed of the battery cell unit, thereby ensuring a high energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] FIG1 is an exploded structural diagram of the connection relationship between the heat dissipation structure of a battery pack and a battery cell in some embodiments of the present application;

[0020] FIG2 is a schematic structural diagram showing the connection relationship between the first heat conducting part, the second heat conducting part, the heat dissipating part and the battery cell in some embodiments of the present application;

[0021] FIG. 3 is a schematic structural diagram for illustrating the connection relationship between the heat dissipation part and the second heat conduction part in some embodiments of the present application.

[0022] Description of Figure Numbers:

[0023] 100, battery pack; 110, battery cell; 112, tab; 200, heat sink; 210, first heat conducting part; 220, second heat conducting part; 230, heat dissipation part; 232, bottom plate; 234, heat dissipation grille; 300, fixing part; 310, fixing bracket; 312, mounting groove; 314, accommodation groove; 316, clearance groove; 400, heat conducting part. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0030] In order to solve the problem in the related art that the heat dissipation structure of the battery pack affects the volume and energy density of the battery pack, on the first hand, referring to Figures 1 and 2, an embodiment of the present application provides a battery pack heat dissipation structure, which is applied to a battery pack 100, and the battery pack 100 includes a plurality of battery cells 110 stacked sequentially along its own length direction, and the battery pack heat dissipation structure includes a plurality of heat sinks 200 and fixing members 300 corresponding to the heat sinks 200, the heat sink 200 is clamped between two adjacent battery cells 110, and the fixing member 300 is set at the edge of the heat sink 200, and the fixing member 300 is used to clamp the heat sink 200 and the battery cell 110 in the battery pack 100.

[0031] The length direction of the battery pack 100 is parallel to the thickness direction of the battery cells 110 , and the length direction of the battery pack 100 is also the array direction of the internal battery cells 110 . The fixing members 300 are arranged on both sides of the battery pack 100 along its own length direction.

[0032] In this embodiment, the edge of the heat sink 200 is fixed by the fixing member 300, and the battery cell 110 is fixed on the fixing member 300 on one side of the heat sink 200. The portion of the heat sink 200 not fixed by the fixing member 300 can conduct heat to the battery cell 110 and dissipate heat. Compared with the stacking of the fixing frame, the heat sink 200 and the battery cell 110 in the related art, this arrangement reduces the thickness of the battery cell unit, thereby reducing the thickness of the battery pack composed of the battery cell units, thereby ensuring that the energy density of the battery pack is relatively high.

[0033] 1 , in this embodiment, the fixing member 300 is a plurality of fixing brackets corresponding to the heat sinks 200 one by one, each fixing bracket group includes two fixing brackets 310 , and the heat sink 200 is sandwiched between the two fixing brackets 310 in the same group.

[0034] The two fixing brackets 310 in the same group are symmetrically arranged with respect to the heat sink 200 and have the same height.

[0035] In this embodiment, the battery cell 110 is fixed on a fixing frame on one side of the heat sink 200, and the edge of the heat sink 200 is fixed by a fixing bracket 310. Compared with the stacking of the fixing frame, the heat sink 200 and the battery cell 110 in the related art, the thickness of the final battery pack 100 is reduced, which helps to improve the energy density of the battery pack 100 and further improve the performance of the battery pack 100.

[0036] 1 , in some embodiments, mounting grooves 312 are provided on opposite side walls of two fixing brackets 310 in the same group, one end of the heat sink 200 is plugged into one of the mounting grooves 312 in the same group, and the other end of the heat sink 200 is plugged into another mounting groove 312 in the same group.

[0037] Specifically, the shape of the notch of the mounting groove 312 matches the shape of the longitudinal section of the end of the heat sink 200. After the heat sink 200 is clamped between two adjacent battery cells 110, the heat sink 200 is fixed by using the fixing bracket 310.

[0038] In the present embodiment, the arrangement of inserting the end of the heat sink 200 into the mounting groove 312 of the fixing bracket 310 reduces the overall thickness of the battery pack 100 finally manufactured compared to the stacking and fixing of the fixing bracket 310 and the heat sink 200, thereby helping to improve the energy density and performance of the battery pack 100; and through the plug-in fit between the mounting groove 312 and the ends of the heat sink 200, it is convenient to quickly fix the heat sink 200, and helps to reduce the possibility of the heat sink 200 bending under external stress, thereby ensuring the heat dissipation performance and performance of the heat sink 200.

[0039] Referring to FIG. 1, in some embodiments, the fixing bracket 310 is provided with a receiving groove 314 for receiving the end of the battery cell 110. A relief groove 316 is formed in the side wall of the receiving groove 314 on the side away from the heat sink 200. The relief groove 316 is used for the tab 112 at the end of the battery cell 110 to extend out of the receiving groove 314.

[0040] Among them, the receiving groove is arranged on the side wall of the fixing bracket 310 close to the corresponding battery cell 110. The relief groove 316 penetrates the groove wall of the receiving groove 314 on the side away from the heat sink 200.

[0041] Through the above settings, the end of the battery cell 110 is received in the receiving groove 314, realizing the fixation of the battery cell 110 and the fixing bracket. After arranging and assembling multiple fixing brackets with battery cells 110, the battery cells 110 are fixed in the fixing brackets.

[0042] In this embodiment, through the cooperation of the receiving groove 314 and the relief groove 316, it is convenient to provide a receiving space for the protruding parts at both ends of the battery cell 110 and the tab 112 while the heat sink 200 is stably clamped between two adjacent battery cells 110; and it helps to make the heat dissipation structure of the battery pack of the present application relatively compact, so that the finally manufactured battery pack 100 has a smaller volume and a larger energy density per unit volume of the battery cell 110, which helps to ensure the performance of the battery pack 100.

[0043] Referring to FIGS. 1 and 2, in some embodiments, the battery cell 110 includes two main surfaces, side surfaces and a bottom surface. The heat sink 200 includes a first heat conducting portion 210 and two second heat conducting portions 220 located at both ends of the first heat conducting portion 210. The first heat conducting portion 210 abuts against one of the main surfaces of the battery cell 110, one of the second heat conducting portions 220 abuts against one bottom surface of the battery cell 110, and the other second heat conducting portion 220 abuts against the other bottom surface of the battery cell 110.

[0044] Among them, the two surfaces with the largest area along the length direction of the battery cell 110 are defined as the main surfaces, the two surfaces along the width direction of the battery cell 110 are defined as the side surfaces, one of the bottom surfaces of the battery cell 110 is also its top surface, the side surfaces of the battery cell 110 are parallel to the array direction of the battery cells 110 and the length direction of the battery pack 100, and the surface of the first heat conducting portion 210 opposite to the main surface of the battery cell 110 is defined as the main surface of the first heat conducting portion 210. The first heat conducting portion 210 and the second heat conducting portions 220 are integrally formed, and the two second heat conducting portions 220 are symmetrically arranged with respect to the first heat conducting portion 210. The overall longitudinal cross-sectional shape of the heat sink 200 is in a C shape, that is, the first heat conducting portion 210 and the two connected second heat conducting portions 220 enclose a groove that can be inserted and matched with the battery cell 110. Correspondingly, the shape of the opening of the above-mentioned installation groove 312 is also in a C shape.

[0045] Specifically, when the heat sink 200 is clamped between two adjacent battery cells 110, one main surface of the first heat conducting part 210 is pressed against the main surface of one of the battery cells 110, and the other main surface of the first heat conducting part 210 is pressed against the main surface of the other battery cell 110, and the bottom surface of one of the second heat conducting parts 220 is pressed against the top surface of one of the battery cells 110, and the top surface of the other second heat conducting part 220 is pressed against the bottom surface of the battery cell 110. In this way, not only can heat be conducted to the middle part of the battery cell 110, increasing the contact area between the heat sink 200 and the surface of the battery cell 110, but also heat conduction and heat dissipation treatment can be performed on the top and bottom surfaces of the battery cell 110, thereby enhancing the heat conduction and heat dissipation effects of the battery cell 110, thereby enhancing the heat dissipation performance of the heat dissipation structure of the battery pack.

[0046] In addition, as shown in FIG2 , the heat sink 200 is clamped in such a manner that the heat sink 200 is also disposed on the outer side of the battery cell 110 at one end of the battery pack 100 away from the groove of the heat sink 200 in order to further improve the overall heat dissipation performance of the battery pack 100. This allows the battery cell 110 at the end of the battery pack 100 to dissipate heat quickly, thereby further improving the overall heat dissipation performance of the heat dissipation structure of the battery pack.

[0047] In this embodiment, through the cooperation of the first heat conducting part 210 and the second heat conducting part 220 , each main surface and side surface of each battery cell 110 can quickly dissipate heat, thereby ensuring the overall heat dissipation performance of the battery pack heat dissipation structure.

[0048] 1 to 3 , in some embodiments, the heat sink 200 further includes a heat dissipation portion 230 , which is disposed on one of the second heat conducting portions 220 , and the height of the heat dissipation portion 230 is higher than the height of the fixing frame.

[0049] After both ends of the first heat conducting part 210 and the second heat conducting part 220 are plugged into the mounting grooves 312 , in order to avoid interference between the heat dissipating part 230 and the fixing brackets 310 on both sides of the heat sink 200 , the heat dissipating part 230 needs to be set on the top of the fixing bracket.

[0050] Specifically, after the heat sink 200 absorbs the heat generated inside the battery cell 110, the heat sink 200 then conducts the heat to the heat dissipation portion 230 for heat dissipation. The heat dissipation portion 230 helps to improve the heat dissipation efficiency of the battery pack 100, thereby improving the heat dissipation performance of the battery pack heat dissipation structure and the corresponding performance of the battery pack 100.

[0051] 2 and 3 , in some embodiments, the length of the heat dissipation portion 230 is greater than the length of the first heat conducting portion 210 and the length of the second heat conducting portion 220 , and the heat dissipation portion 230 is centrally aligned with the battery cell 110 .

[0052] The length of the first heat conducting part 210 is consistent with that of the second heat conducting part 220 , and the length of the first heat conducting part 210 is smaller than that of the battery cell 110 . The first heat conducting part 210 is centered with the outer surface of the battery cell 110 in the length direction, and the heat dissipation part 230 is also centered with the battery cell 110 .

[0053] Specifically, since the battery cell 110 usually generates the most and most concentrated heat in the middle part during use, the length of the first heat conducting part 210 is set to be smaller than the length of the battery cell 110, and the first heat conducting part 210 is set to be centered with the outer surface of the battery cell 110 in the length direction, and the heat dissipation part 230 is also set to be centered with the battery cell 110. This can allow a large amount of heat generated in the middle of the battery cell 110 to be conducted to the heat dissipation part 230, while helping to save materials required for the preparation of the heat dissipation structure of the battery pack. In addition, since the length of the heat dissipation part 230 is longer, the contact area between the heat dissipation part 230 and the air is increased, which helps to ensure the overall heat dissipation effect of the heat sink 200 on the battery cell 110.

[0054] In this embodiment, the length of the heat dissipation part 230 is set to be greater than the length of the first heat conducting part 210 and the length of the second heat conducting part 220, which helps to increase the contact area between the heat dissipation part 230 and the air, thereby ensuring the overall heat dissipation effect of the heat sink 200 on the battery cell 110, and further ensuring the heat dissipation performance of the battery pack heat dissipation structure.

[0055] 2 and 3 , in some embodiments, the heat dissipation portion 230 includes a bottom plate 232 and a plurality of heat dissipation grilles 234 . The bottom plate 232 is disposed on the second heat conducting portion 220 abutting against the top surface of the battery cell 110 , and the heat dissipation grilles 234 are disposed on the upper surface of the bottom plate 232 .

[0056] Among them, the length direction of the heat sink 234 is parallel to the length direction of the base plate 232, the length direction of the base plate 232 is parallel to the length direction of the first heat conducting part 210, and a plurality of heat sinks 234 are arranged in an array along the width direction of the base plate 232. The base plate 232 and the plurality of heat sinks 234 can be integrally formed.

[0057] In this embodiment, the cooperation of a plurality of heat sinks 234 and the bottom plate 232 helps to increase the contact area between the heat sink 230 and the air, thereby improving the heat dissipation efficiency of the heat sink 230 and further ensuring the overall heat dissipation performance of the battery pack heat dissipation structure.

[0058] Optionally, in some embodiments, the heat dissipation part 230 and the second heat conductive part 220 pressed against the top surface of the battery cell 110 are detachably connected and fixed, and the detachable connection method includes but is not limited to bolt connection, snap-on connection, etc., and one heat dissipation part 230 can correspond to multiple second heat conductive parts 220 pressed against the top surface of the battery cell 110.

[0059] In this embodiment, the connection between the heat dissipation part 230 and the second heat conducting part 220 is set to be a detachable connection, which is convenient for selecting a suitable size of the heat dissipation part 230 according to the thickness of the battery pack 100, thereby improving the adaptability of the heat dissipation structure of the battery pack in this embodiment.

[0060] Optionally, referring to Figure 3, in some embodiments, a heat dissipation portion 230 corresponds to a second heat conductive portion 220 pressed against the top surface of the battery cell 110, and the heat dissipation portion 230 and the second heat conductive portion 220 pressed against the top surface of the battery cell 110 are manufactured integrally, and a heat dissipation gap is reserved between two adjacent heat dissipation portions 230.

[0061] In the present embodiment, one heat dissipation portion 230 is arranged to correspond to one heat dissipation portion 230 , which helps to improve the adaptability of the heat dissipation structure while helping to improve the assembly efficiency of the heat dissipation structure of the battery pack; and a heat dissipation gap is reserved between two adjacent heat dissipation portions 230 , so that each surface of the heat dissipation grille 234 on the bottom plate 232 can be in contact with the air, thereby helping to ensure the heat dissipation effect of the heat dissipation portion 230 .

[0062] 1 and 2 , in some embodiments, a heat conducting member 400 is sandwiched between the heat sink 200 and the battery cell 110 , and the heat conducting member 400 is tightly pressed against both the battery cell 110 and the heat sink 200 .

[0063] Specifically, since a gap is generated between the heat sink 200 and the battery cell 110 after the ends of the heat sink 200 are plugged into the mounting grooves 312 on the fixing brackets 310 on both sides, a heat conductor 400 is provided to fill the gap so that the side surface of the battery cell 110 along its own length direction can fully contact the heat sink 200, thereby ensuring the sufficiency and efficiency of heat conduction between the battery cell 110 and the heat sink 200.

[0064] In this embodiment, by sandwiching a heat conductive member 400 between the heat sink 200 and the battery cell 110, it helps to fill the gap between the heat sink 200 and the battery cell 110 after the fixing bracket 310 is installed, thereby ensuring the sufficiency and efficiency of heat conduction between the battery cell 110 and the heat sink 200; and the end of the heat sink 200 is inserted into the installation groove 312 on the fixing bracket 310. Due to the thickness difference between the heat sink 200 and the fixing bracket 310, there is a gap between the heat sink 310 and the corresponding battery cell 110. The heat conductive sheet 400 is arranged in the gap, which can ensure the effect of heat conduction while avoiding affecting the thickness of the battery pack.

[0065] Optionally, in some embodiments, the heat conducting member 400 includes a thermally conductive adhesive layer. Since the thermally conductive adhesive layer has good adhesion and thermal conductivity, the thermally conductive adhesive layer can tightly bond the heat sink 200 to the battery cell 110 .

[0066] In the present embodiment, since the battery cell 110 is prone to expand during the use of the battery pack 100, the battery surface may be uneven, and the thermally conductive adhesive layer has the characteristics of moderate viscosity and high thermal conductivity. Therefore, the heat sink 200 and the battery cell 110 are tightly connected through the thermally conductive adhesive layer, which helps to ensure that the surface of the battery cell 110 on one side of its own length direction can better contact the heat sink 200, so that the recessed part of the battery cell 110 can also smoothly conduct heat to the heat sink 200, thereby further ensuring the heat dissipation performance of the battery pack heat dissipation structure.

[0067] The battery pack heat dissipation structure of the present application fixes the edge of the heat sink 200 by the fixing part 300, and fixes the battery cell 110 on the fixing part 300 on one side of the heat sink 200. The portion of the heat sink 200 not fixed by the fixing part 300 can conduct heat and dissipate heat to the battery cell 110. Compared with the stacking of the fixing frame, the heat sink 200 and the battery cell 110 in the related art, this arrangement reduces the thickness of the battery cell unit, thereby reducing the thickness of the battery pack composed of the battery cell units, thereby ensuring that the energy density of the battery pack is relatively high.

[0068] In the second aspect, referring to FIG. 1 and FIG. 2 , the present application provides a battery pack 100 , including any one of the battery pack heat dissipation structures provided in the first aspect, and the battery pack 100 also includes a plurality of battery cells 110 stacked sequentially along its length direction.

[0069] Specifically, the battery pack 100 also includes a box for accommodating the above-mentioned battery pack heat dissipation structure and the battery module, and the box plays a stabilizing and limiting role for the internal battery pack heat dissipation structure. Since the battery pack heat dissipation structure provided in the first aspect has a relatively thin thickness and good heat dissipation performance after being installed in conjunction with the battery cell 110, the battery pack 100 in this embodiment also has a relatively thin thickness, a relatively small volume, and a relatively high energy density after being equipped with the above-mentioned battery pack heat dissipation structure, and has good heat dissipation performance, thereby helping to ensure the performance of the battery pack 100.

[0070] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery pack heat dissipation structure, applied to a battery pack, wherein the battery pack comprises a plurality of battery cells stacked in sequence along its length direction, characterized in that: The battery pack heat dissipation structure comprises: A plurality of heat sinks are sandwiched between two adjacent battery cells; A fixing member is arranged on the edge of the heat sink, and is used to clamp the heat sink and the battery cell in the battery pack.

2. The heat dissipation structure of the battery pack according to claim 1, characterized in that: The fixing members are a plurality of groups of fixing frames corresponding to the heat sinks one by one, each group of the fixing frames comprises two fixing brackets, and the heat sinks are sandwiched between the two fixing brackets in the same group.

3. The heat dissipation structure of the battery pack according to claim 2, characterized in that: Mounting grooves are provided on opposite side walls of the two fixing brackets in the same group, one end of the heat sink is plugged into one of the mounting grooves in the same group, and the other end of the heat sink is plugged into another mounting groove in the same group.

4. The heat dissipation structure of the battery pack according to claim 3, characterized in that: The fixing bracket is provided with a receiving groove for accommodating the end of the battery cell, and a clearance groove is opened on the side wall of the receiving groove away from the heat sink. The clearance groove is used for the pole ear of the end of the battery cell to extend out of the receiving groove.

5. The heat dissipation structure of a battery pack according to any one of claims 2 to 4, characterized in that: The battery core includes two main surfaces, a side surface and a bottom surface, and the heat sink includes a first heat conducting part and two second heat conducting parts located at both ends of the first heat conducting part, the first heat conducting part is pressed against the main surface of the battery core, one of the second heat conducting parts is pressed against one of the bottom surfaces of the battery core, and the other second heat conducting part is pressed against the other bottom surface of the battery core.

6. The heat dissipation structure of the battery pack according to claim 5, characterized in that: The heat sink further includes a heat dissipation portion, which is disposed on one of the second heat-conducting portions, and a height of the heat dissipation portion is higher than a height of the fixing frame.

7. The heat dissipation structure of the battery pack according to claim 6, characterized in that: The heat dissipation portion has a length greater than that of the first heat conduction portion and that of the second heat conduction portion, and is aligned with the center of the battery core.

8. The heat dissipation structure of the battery pack according to claim 6, characterized in that: The heat dissipation part comprises a bottom plate and a plurality of heat dissipation grids. The bottom plate is arranged on the second heat conducting part which is in close contact with the top surface of the battery core, and the heat dissipation grids are arranged on the upper surface of the bottom plate.

9. The heat dissipation structure of the battery pack according to claim 3, characterized in that: A heat conducting member is sandwiched between the heat sink and the battery core, and the heat conducting member is tightly pressed against both the battery core and the heat sink.

10. A battery pack, characterized in that: The battery pack comprises the heat dissipation structure of any one of claims 1 to 9, wherein the battery pack further comprises a plurality of battery cells stacked sequentially along the length direction of the battery pack.

Images