Chain type heat dissipation structure of battery pack

Abstract

The utility model provides a battery pack chain type heat dissipation structure, the battery pack chain type heat dissipation structure comprises a heat dissipation shell, a heat conduction glue heat dissipation layer and a battery module, the battery module comprises a support, a heat conduction glue battery cell layer, an insulation heat conduction plate and a battery cell, the heat conduction glue battery cell layer and the battery cell are both arranged in a battery cell placing cavity formed by connecting the support and the insulation heat conduction plate, and the heat-conducting glue battery cell layer covers the battery cell and is connected with the insulating heat-conducting plate. Heat generated by the battery cells is uniformly transmitted to the insulating heat-conducting plate through the heat-conducting glue battery cell layer and the battery cell negative electrodes, so that local heat accumulation caused by unbalanced temperature of the battery cells is avoided, and the stability of the chain type heat dissipation structure of the battery pack is improved; the heat generated by the battery cell is uniformly radiated along a heat conduction path from the battery cell cathode, the insulating heat conduction plate and the heat conduction glue heat dissipation layer to the heat dissipation shell in sequence, so that the heat dissipation of the chain type heat dissipation structure of the battery pack is uniform.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery thermal management, and particularly to a battery pack chain heat dissipation structure. Background Art

[0002] During the use of a battery pack, the temperature of the battery cells will continuously increase during the discharge process. When the battery cells work at a high temperature, the rate of the internal chemical reaction will accelerate, resulting in an increase in the internal impedance, thereby causing a decrease in the internal voltage of the battery cells, further limiting their discharge capacity, reducing the cycle service life of the battery cells, and the heat conduction efficiency is the focus of the heat dissipation structure design.

[0003] The existing heat dissipation structures mainly adopt a fully potted structure. The fully potted structure uses a thermally conductive glue to completely fill the internal structure of the battery housing, and uses the thermally conductive glue as the medium for heat conduction. For example

[0004] CN201720184914.7 discloses a battery module, which includes a battery housing and a battery pack. The battery pack is housed in the battery housing. The battery pack includes a plurality of single cells. Each single cell is provided with a tab and an output terminal electrically connected to the tab. The battery pack top cover is hermetically connected to the battery housing, and the gap between the battery pack and the battery housing is filled with potting glue.

[0005] However, although the battery module can significantly improve the safety and energy density of the battery module by filling the gap between the battery pack and the battery housing with potting glue, in this solution, the gap between the battery pack and the battery housing is filled with potting glue, and there are differences in the gaps and distances between different battery cells and the outer shell, which will increase the temperature imbalance between the battery cells, and increase the overall weight of the battery pack, resulting in an increase in the power consumption of the battery pack and a reduction in the battery pack's cruising range. Utility Model Content

[0006] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a battery pack chain heat dissipation structure with uniform heat dissipation.

[0007] The purpose of the present disclosure is achieved through the following technical solutions:

[0008] A battery pack chain heat dissipation structure includes a heat dissipation housing, a thermally conductive glue heat dissipation layer, and a battery module. The heat dissipation housing is provided with an installation groove.

[0009] The battery module includes a bracket, a thermally conductive glue battery cell layer, an insulating thermally conductive plate, and battery cells. The bracket is installed in the installation groove. The bracket is provided with a battery cell placement groove and a potting port. The potting port communicates with the battery cell placement groove. The battery cells are arranged in the battery cell placement groove. The thermally conductive glue battery cell layer is filled in the potting port, and the thermally conductive glue battery cell layer covers the battery cells. The negative electrode ends of the thermally conductive glue battery cell layer and the battery cells both abut against the insulating thermally conductive plate.

[0010] A thin-layer cavity is formed between the insulating heat-conducting plate and the heat-dissipating housing, and the heat-conducting adhesive heat-dissipating layer is disposed in the thin-layer cavity.

[0011] In one embodiment, the number of the brackets, the heat-conducting adhesive battery cell layers, the insulating heat-conducting plates and the battery cells is two. A corresponding thin-layer cavity is formed between each insulating heat-conducting plate and the corresponding heat-dissipating housing. The negative electrode end of each battery cell abuts against the corresponding insulating heat-conducting plate. Each heat-conducting adhesive battery cell layer covers the corresponding battery cell. The two brackets are connected to each other on a side away from the insulating heat-conducting plates.

[0012] In one embodiment, the battery module further includes a connecting plate. One end of the connecting plate is connected to one of the brackets, and one end of the connecting plate is connected to the other bracket.

[0013] In one embodiment, fixing members protrude from a surface of the bracket on a side away from the insulating heat-conducting plate, and fixing grooves are formed in the surface of the bracket on the side away from the insulating heat-conducting plate. The fixing members are adaptively installed in the fixing grooves.

[0014] In one embodiment, the battery module further includes a fastener. The insulating heat-conducting plate covers a side of the battery cell placement groove away from the glue filling port. The insulating heat-conducting plate is provided with fixing through holes, and the bracket is provided with fastening holes. The fastener passes through the fixing through holes. One end of the fastener is connected to the fastening hole, and the other end of the fastener abuts against the insulating heat-conducting plate.

[0015] In one embodiment, a positioning groove is formed in the installation groove, and positioning members protrude from two sides of the bracket. The positioning members are installed in the positioning groove.

[0016] In one embodiment, heat-dissipating inclined grooves are formed on an outer wall of the bracket. The number of the heat-dissipating inclined grooves is multiple, and the multiple heat-dissipating inclined grooves are spaced apart from each other on the outer wall of the bracket.

[0017] In one embodiment, the insulating heat-conducting plate is further provided with a limiting groove, and the bracket protrudes with a limiting protrusion. The limiting protrusion is embedded in the limiting groove.

[0018] In one embodiment, heat-dissipating grooves are formed on outer walls on both sides of the heat-dissipating housing.

[0019] In one embodiment, the number of the heat-dissipating grooves is multiple, the multiple heat-dissipating grooves are spaced apart from each other, and the multiple heat-dissipating grooves are parallel to each other.

[0020] Compared with the prior art, the present disclosure has at least the following advantages:

[0021] 1. In the above battery pack chain heat dissipation structure, when the battery cells are installed in the battery cell placement grooves, the heat-conducting glue battery cell layer wraps the battery cells, and the negative electrode ends of the battery cells abut against the insulating heat-conducting plates, so that each battery cell unit in the battery cells can evenly transfer heat through the insulating heat-conducting plates, thereby making the temperatures of the battery cell units in the battery cells balanced, avoiding the problem of local heat accumulation caused by unbalanced battery cell temperatures, and thus improving the heat dissipation stability of the battery pack chain heat dissipation structure.

[0022] 2. Since a thin-layer cavity is formed between the battery module and the heat dissipation housing, and the heat-conducting glue heat dissipation layer is arranged in the thin-layer cavity, the heat generated by the battery cells is dissipated evenly along the heat conduction path from the negative electrode ends of the battery cells, through the insulating heat-conducting plates, the heat-conducting glue heat dissipation layer to the heat dissipation housing, so that the heat dissipation of the battery pack chain heat dissipation structure is relatively uniform, avoiding the problem of unbalanced temperatures between the battery cells in the way of filling the gap between the battery module and the heat dissipation housing with potting glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0024] Figure 1 FIG. is a schematic structural diagram of a battery pack chain heat dissipation structure according to an embodiment;

[0025] Figure 2 is Figure 1 another schematic structural diagram of the battery pack chain heat dissipation structure shown;

[0026] Figure 3 is Figure 1 a partial exploded view of the battery module shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present disclosure more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are intended only to describe specific embodiments and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:

[0031] like Figures 1 to 3 As shown, a battery pack chain heat dissipation structure 10 of an embodiment of the present disclosure includes a heat dissipation shell 100, a thermally conductive adhesive heat dissipation layer 200 and a battery module 300. The heat dissipation shell 100 is provided with a mounting groove 101. The heat dissipation shell 100 is made of metal to ensure good heat dissipation of the heat dissipation shell 100.

[0032] The battery module 300 includes a bracket 310, a thermally conductive adhesive core layer 320, an insulating thermal conductive plate 330, and a battery cell 340. The bracket 310 is provided with a battery cell placement groove 3101 and a glue injection port 3102. The battery cell 340 and the thermally conductive adhesive core layer 320 are arranged in the battery cell placement groove 3101. The glue injection port 3102 is connected to the battery cell placement groove 3101. The glue injection port 3102 is provided on the surface of the bracket 310 on the side away from the insulating thermal conductive plate 330. The glue injection port 3102 is used to inject thermally conductive adhesive to form the thermally conductive adhesive core layer 320. The thermally conductive adhesive core layer 320 is coated on the battery core 340. The thermally conductive adhesive core layer 320 is used to absorb the heat of the battery core 340. The negative electrodes of the thermally conductive adhesive core layer 320 and the battery core 340 are both connected to the insulating thermal conductive plate 330. A thin layer cavity 102 is formed between the insulating thermal conductive plate 330 and the heat dissipation shell 100. The thermally conductive adhesive heat dissipation layer 200 is arranged in the thin layer cavity 102. The thin layer cavity 102 is filled with thermal conductive glue to form the thermally conductive adhesive heat dissipation layer 200. The thermally conductive adhesive heat dissipation layer 200 is used to transfer the heat of the insulating thermal conductive plate 330.

[0033] In this embodiment, the battery cell 340 is installed in the battery cell placement groove 3101, and the thermal conductive glue battery core layer 320 is coated on the battery cell 340. A plurality of battery cell monomers are installed in the battery cell 340. The thermal conductive glue battery core layer 320 formed by the thermal conductive glue is coated on the surface of each battery cell. The thermal conductive glue forms a thermal conductive glue heat dissipation layer 200 between the bracket 310 and the heat dissipation shell 100. The negative electrode of each battery cell is connected to the insulating heat conductive plate 330. The battery cell 340 will continuously generate heat during the discharge process. The heat is transferred to the insulating heat conductive plate 330 through the thermal conductive adhesive core layer 320 and the negative end of the battery core 340 respectively. The insulating heat conductive plate 330 transfers the absorbed heat to the thermal conductive adhesive heat dissipation layer 200 in the thin layer cavity 102. The thermal conductive adhesive heat dissipation layer 200 transfers the heat to the heat dissipation shell 100, so that the heat generated by the battery core 340 is transferred in sequence along the heat conductive path of the negative end of the battery core 340, the insulating heat conductive plate 330, the thermal conductive adhesive heat dissipation layer 200 to the heat dissipation shell 100.

[0034] In the above-mentioned battery pack chain heat dissipation structure 10, when the battery cell 340 is installed in the battery cell placement groove 3101, the thermal conductive adhesive battery layer 320 is coated on the battery cell 340, and the negative end of the battery cell 340 is in contact with the insulating heat conductive plate 330, so that each battery cell in the battery cell 340 can transfer heat evenly through the insulating heat conductive plate 330, thereby making the temperature between the battery cells in the battery cell 340 balanced, avoiding the problem of local heat accumulation caused by uneven temperature of the battery cell 340, thereby improving the heat dissipation stability of the battery pack chain heat dissipation structure 10; the thin layer between the battery module 300 and the heat dissipation shell 100 The cavity 102 is used to encapsulate thermally conductive glue to form a thermally conductive glue heat dissipation layer 200. The heat generated by the battery cell 340 passes through the thermal conduction path of the negative end of the battery cell 340, the insulating thermal conductive plate 330, the thermally conductive glue heat dissipation layer 200 to the heat dissipation shell 100 in sequence, so that the heat is evenly dissipated from the negative end of the battery cell 340, the insulating thermal conductive plate 330, the thermally conductive glue heat dissipation layer 200 to the heat dissipation shell 100, thereby making the battery pack chain heat dissipation structure 10 dissipate heat evenly, avoiding the problem of temperature imbalance between the battery cells 340 caused by filling the gap between the battery module 300 and the heat dissipation shell 100 with potting glue.

[0035] like Figure 1 and Figure 2As shown, in one embodiment, the number of the bracket 310, the thermally conductive adhesive cell layer 320, the insulating heat conducting plate 330, and the cell 340 is two. A corresponding thin-layer cavity 102 is formed between each insulating heat conducting plate 330 and the corresponding heat dissipation housing 100. The negative electrode of each cell 340 is connected to the corresponding insulating heat conducting plate 330. Each thermally conductive adhesive cell layer 320 is wrapped around the corresponding cell 340. Each cell 340 and the thermally conductive adhesive cell layer 320 are disposed in the corresponding cell placement groove 3101. The two brackets 310 are connected to each other on the side facing away from the insulating heat conducting plate 330. In this embodiment, two thermally conductive adhesive heat dissipation layers 200 and the battery module 300 are installed in the installation groove 101 opened in the same heat dissipation housing 100, making full use of the space of the installation groove 101, saving the material for producing the heat dissipation housing, and reducing the production cost of the battery pack chain heat dissipation structure 10.

[0036] As Figure 2 and Figure 3 shown, in one embodiment, the battery module 300 further includes a connecting plate 311. One end of the connecting plate 311 is connected to one bracket, and the other end of the connecting plate 311 is connected to the other bracket. In this embodiment, the two ends of the connecting plate 311 are respectively connected to the two brackets, making the connection between the two brackets 310 more firm, increasing the connection strength between the two brackets 310, and preventing the brackets 310 from shifting in the installation groove 101, thereby improving the stability of the battery pack chain heat dissipation structure 10.

[0037] As Figure 3 shown, in one embodiment, a fixing member 314 protrudes from the side of each bracket 310 facing away from the corresponding insulating heat conducting plate 330, and a fixing groove 3104 is formed on the side of each bracket 310 facing away from the corresponding insulating heat conducting plate 330. The fixing member 314 is adaptively installed in the fixing groove 3104. In this embodiment, the fixing member 314 of one bracket 310 is correspondingly installed in the fixing groove 3104 of the other bracket 310, reducing the shaking between the two brackets 310, making the connection between the two brackets 310 more stable, and thus increasing the connection strength between the two brackets 310.

[0038] As Figure 1 and Figure 3As shown, in one embodiment, the battery module 300 further includes a fastener 350. The insulating and heat-conducting plate 330 covers the side of the battery cell placement groove 3101 facing away from the potting port 3102. The insulating and heat-conducting plate 330 is provided with a fixing through hole 3301, and the bracket 310 is provided with a fastening hole. The fastener passes through the fixing through hole 3301, one end of the fastener 350 is connected to the fastening hole, and the other end of the fastener abuts against the insulating and heat-conducting plate 330. In this embodiment, the fastener 350 passes through the fixing through hole 3301 provided in the insulating and heat-conducting plate 330 and the fastening hole provided in the bracket 310, making the connection between the insulating and heat-conducting plate 330 and the bracket 310 more firm and forming a sealed battery cell placement groove 3101, avoiding the leakage of the heat-conducting glue battery cell layer 320 in the battery cell placement groove 3101.

[0039] As Figure 1 and Figure 2 shown, in one embodiment, a positioning groove 104 is formed in the installation groove 101. Positioning members 315 protrude from both sides of each bracket 310, and the positioning members 315 are installed in the positioning groove 104. In this embodiment, when the two brackets 310 are assembled into the installation groove 101, the protruding positioning members 315 of the two brackets 310 are respectively installed in the corresponding positioning grooves 104 in the installation groove 101, so that the positioning members 315 abut against the inner wall of the heat dissipation housing 100. The positioning members 315 on the inner wall of the heat dissipation housing 100 limit the movement of the bracket 310 in the installation groove 101, and at the same time simplify the process of assembling the bracket to the heat dissipation housing 100, facilitating the disassembly and assembly of the bracket 310 in the installation groove 101.

[0040] As Figure 1 and Figure 2 shown, in one embodiment, heat dissipation inclined grooves 3105 are formed on the outer wall of the bracket 310. The number of the heat dissipation inclined grooves 3105 is multiple, and the multiple heat dissipation inclined grooves 3105 are arranged at intervals on the outer wall of the bracket 310. In this embodiment, the heat dissipation inclined grooves 3105 increase the contact area between the inner wall of the bracket 310 and the heat-conducting glue battery cell layer 320, improving the rate of heat transfer from the heat-conducting glue battery cell layer 320 to the air through the bracket 310, and thus improving the heat dissipation efficiency of the battery pack chain heat dissipation structure 10.

[0041] As Figure 3 shown, in one embodiment, the insulating and heat-conducting plate 330 is further provided with a limiting groove 3302, and the bracket 310 is provided with a limiting protrusion 312, and the limiting protrusion 312 is embedded in the limiting groove 3302. In this embodiment, after the limiting protrusion 312 is embedded in the limiting groove 3302, the connection between the bracket 310 and the insulating and heat-conducting plate 330 is more firm, making the battery cell placement groove 3101 formed between the bracket 310 and the insulating and heat-conducting plate 330 more stable, thereby improving the stability of the battery pack chain heat dissipation structure 10.

[0042] AsFigure 2 As shown, in one embodiment, heat dissipation slots 103 are provided on the outer walls of both sides of the heat dissipation housing 100. In this embodiment, the heat dissipation slots 103 provided on the heat dissipation housing 100 increase the contact area between the heat dissipation housing 100 and the air, thereby accelerating the efficiency of heat exchange between the heat dissipation housing 100 and the air, thereby improving the heat dissipation efficiency of the battery pack chain heat dissipation structure 10.

[0043] like Figure 2 As shown, in one embodiment, there are multiple heat dissipation slots 103, which are spaced apart and parallel to each other. In this embodiment, multiple heat dissipation slots 103 are provided on both sides of the heat dissipation housing 100, further increasing the contact area between the heat dissipation housing 100 and the air, while also accelerating the efficiency of heat exchange between the heat dissipation housing 100 and the air, further improving the heat dissipation efficiency of the battery pack chain heat dissipation structure 10.

[0044] Compared with the prior art, the present disclosure has at least the following advantages:

[0045] 1. In the above-mentioned battery pack chain heat dissipation structure 10, when the battery cell 340 is installed in the battery cell placement groove 3101, the thermal conductive adhesive battery layer 320 is coated on the battery cell 340, and the negative end of the battery cell 340 is in contact with the insulating heat conductive plate 330, so that each battery cell in the battery cell 340 can transfer heat evenly through the insulating heat conductive plate 330, thereby making the temperature between the battery cells in the battery cell 340 balanced, avoiding the problem of local heat accumulation caused by uneven temperature of the battery cell 340, and thereby improving the heat dissipation stability of the battery pack chain heat dissipation structure 10.

[0046] 2. The thin layer cavity 102 between the battery module 300 and the heat dissipation shell 100 is used to fill thermally conductive glue to form a thermally conductive glue heat dissipation layer 200. The heat generated by the battery cell 340 passes through the thermal conduction path from the negative end of the battery cell 340, the insulating thermal conductive plate 330, the thermally conductive glue heat dissipation layer 200 to the heat dissipation shell 100 in sequence, so that the heat is evenly dissipated from the negative end of the battery cell 340, the insulating thermal conductive plate 330, the thermally conductive glue heat dissipation layer 200 to the heat dissipation shell 100, thereby making the battery pack chain heat dissipation structure 10 evenly dissipated, avoiding the problem of uneven temperature between the battery cells 340 caused by filling the gap between the battery module 300 and the heat dissipation shell 100 with potting glue.

[0047] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. A battery pack chain heat dissipation structure, comprising a heat dissipation shell, a heat conductive adhesive heat dissipation layer and a battery module, wherein the heat dissipation shell is provided with a mounting groove, characterized in that: The battery module includes a bracket, a thermally conductive adhesive core layer, an insulating heat-conducting plate and a battery cell. The bracket is installed in the installation slot. The bracket is provided with a battery cell placement slot and a glue injection port. The glue injection port is connected to the battery cell placement slot. The battery cell is arranged in the battery cell placement slot. The thermally conductive adhesive core layer is filled in the glue injection port, and the thermally conductive adhesive core layer is coated on the battery cell. The thermally conductive adhesive core layer and the negative end of the battery cell are both in contact with the insulating heat-conducting plate. A thin cavity is formed between the insulating heat-conducting plate and the heat-dissipating housing, and the heat-conducting adhesive heat-dissipating layer is arranged in the thin cavity.

2. The battery pack chain heat dissipation structure according to claim 1, wherein The number of the bracket, thermal conductive glue core layer, insulating thermal conductive plate and battery core is two, a corresponding thin layer cavity is formed between each insulating thermal conductive plate and the corresponding heat dissipation shell, the negative end of each battery core is in contact with the corresponding insulating thermal conductive plate, and each thermal conductive glue core layer is covered on the corresponding battery core, and the two brackets are connected to each other on the side away from the insulating thermal conductive plate.

3. The battery pack chain-type heat dissipation structure according to claim 2, characterized in that, The battery module further includes a connecting plate, one end of which is connected to one of the brackets, and one end of which is connected to the other bracket.

4. The battery pack chain heat dissipation structure according to claim 2, wherein, A fixing piece is protruding from the surface of the bracket on the side away from the insulating heat conducting plate, and a fixing groove is opened on the surface of the bracket on the side away from the insulating heat conducting plate, and the fixing piece is adapted to be installed in the fixing groove.

5. The battery pack chain heat dissipation structure according to claim 1, characterized in that, The battery module also includes a fastener. The insulating heat-conducting plate cover is arranged on the side of the battery cell placement groove away from the glue filling port. The insulating heat-conducting plate is provided with a fixing through hole, and the bracket is provided with a fastening hole. The fastener is passed through the fixing through hole, one end of the fastener is connected to the fastening hole, and the other end of the fastener abuts against the insulating heat-conducting plate.

6. The battery pack chain heat dissipation structure according to claim 4, wherein, A positioning groove is formed in the installation groove, and positioning pieces are protruded on both sides of the bracket, and the positioning pieces are installed in the positioning groove.

7. The battery pack chain heat dissipation structure according to claim 1, wherein, The outer wall of the bracket is formed with a heat dissipation oblique groove, and the number of the heat dissipation oblique grooves is multiple, and the multiple heat dissipation oblique grooves are arranged at intervals on the outer wall of the bracket.

8. The battery pack chain heat dissipation structure according to claim 1, characterized in that The insulating heat-conducting plate is further provided with a limiting groove, and the bracket is convexly provided with a limiting protrusion, and the limiting protrusion is embedded in the limiting groove.

9. The battery pack chain heat dissipation structure according to claim 1, characterized in that The outer walls on both sides of the heat dissipation housing are provided with heat dissipation grooves.

10. The battery pack chain heat dissipation structure according to claim 9, wherein, There are multiple heat dissipation slots, which are arranged at intervals and are parallel to each other.

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