Battery pack and energy storage system

Abstract

The invention provides a battery pack and an energy storage system, and the battery pack comprises a box body which is provided with an accommodation cavity; the plurality of battery packs are arranged in the accommodating cavity; the fuse assembly comprises a fuse and a fuse support, the fuse is electrically connected with the plurality of battery packs, and the fuse support is used for fixing the fuse; wherein a heat dissipation structure is arranged between the fuse support and the fuse, and the heat dissipation structure is used for heat dissipation of the fuse.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack and an energy storage system. Background Art

[0002] A fuse is usually installed inside the battery pack to provide overcurrent protection. In the related art, the fuse is usually fixed directly inside the battery box, and the fuse generates heat when working. If the heat cannot be dissipated in time, it will affect the normal operation and reliability of the fuse. Summary of the invention

[0003] Embodiments of the present invention provide a battery pack and an energy storage system, which can improve the heat dissipation problem of a fuse inside the battery pack.

[0004] In a first aspect, an embodiment of the present invention provides a battery pack, comprising: a box body, provided with a accommodating cavity; a plurality of battery packs, arranged in the accommodating cavity; a fuse assembly, the fuse assembly comprising a fuse and a fuse holder, the fuse is electrically connected to the plurality of battery packs, and the fuse holder fixes the fuse; wherein a heat dissipation structure is provided between the fuse holder and the fuse, and the heat dissipation structure is used to dissipate heat for the fuse.

[0005] In one embodiment, the heat dissipation structure includes a heat-conducting bracket, the heat-conducting bracket includes a first supporting portion and a heat-conducting portion, the first supporting portion is provided with a heat dissipation port, the heat-conducting portion is connected to the first supporting portion and is provided with a heat-conducting cavity connected to the heat dissipation port; wherein the fuse is supported on a side of the first supporting portion away from the heat-conducting portion and opposite to the heat dissipation port.

[0006] In one embodiment, the first supporting portion is further provided with a groove, the heat dissipation port is provided on the bottom surface of the groove, the bottom surface of the groove includes a first portion close to the heat dissipation port and a second portion away from the heat dissipation port; wherein the fuse is supported on the second portion.

[0007] In one embodiment, the fuse is spaced apart from an end surface of the heat dissipation port.

[0008] In one embodiment, the fuse bracket includes a base portion and a fixing portion that are bent and connected, and the fixing portion is fixed to the bottom plate of the box body; the first supporting portion of the thermally conductive bracket includes a bottom wall and a side wall that are bent and connected, the bottom wall supports the fuse and is provided with the heat dissipation port and the groove, and the side wall is fixed to the base portion.

[0009] In one embodiment, one end of the heat conducting portion is connected to the heat dissipation opening of the bottom wall, and the other end of the heat conducting portion is abutted against the bottom plate of the box body.

[0010] In one embodiment, the fixing portion of the fuse holder includes two fixing legs, and the two fixing legs are fixed to the bottom plate of the box body; wherein a gap is provided between the two fixing legs, and the other end of the heat conductive portion passes through the gap and abuts against the bottom plate of the box body.

[0011] In one embodiment, the heat dissipation structure includes a first heat dissipation gap and a second heat dissipation gap, the fuse bracket includes a base portion and a fixing portion that are bent and connected, the fixing portion is fixed to the bottom plate of the box body, and the fuse is fixed to the base portion, and along the length direction of the battery pack, the first heat dissipation gap is arranged between the base portion and the fuse, and / or, along the height direction of the battery pack, the second heat dissipation gap is arranged between the bottom end surface of the fixing portion and the fuse.

[0012] In one embodiment, the fuse includes a fuse tube and two connecting pieces electrically connected to the two ends of the fuse tube respectively, and the fuse assembly also includes an insulating piece and two insulating columns, the insulating piece is fixed on the base portion of the fuse holder, one end of each of the insulating columns is connected to one of the connecting pieces, and the other end of each of the insulating columns passes through the insulating piece and the base portion of the fuse holder in sequence.

[0013] In one embodiment, it also includes a BMU assembly located on one side of the fuse assembly, and a connector assembly located on the other side of the fuse assembly, wherein the connector assembly is electrically connected to the BMU assembly and the fuse assembly, and the BMU assembly, the fuse assembly and the connector assembly are located at the same end of the battery pack.

[0014] In one embodiment, the BMU assembly includes a BMU and a BMU bracket for fixing the BMU, and the BMU is electrically connected to the plurality of battery packs; the battery pack also includes a first connecting row, and the first connecting row is electrically connected between the plurality of battery packs and the fuse, and the BMU bracket includes a main body and a second supporting portion that are connected to each other, the main body fixes the BMU, and the second supporting portion supports the first connecting row.

[0015] In a second aspect, an embodiment of the present invention provides an energy storage system, which includes a plurality of battery packs and a battery rack for fixing the plurality of battery packs, wherein the battery packs are configured as the above-mentioned battery packs.

[0016] Beneficial effects of the embodiments of the present invention:

[0017] In the embodiment of the present invention, a heat dissipation structure is provided between the fuse and the fuse holder so that the heat generated by the fuse can be diffused through the heat dissipation structure, thereby improving the technical problem that the normal operation of the fuse is affected by excessive temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a three-dimensional diagram of a battery pack provided by an embodiment of the present invention;

[0020] Figure 2 is an internal structure diagram of a battery pack provided by a first embodiment of the present invention;

[0021] Figure 3 yes Figure 2 A partial enlarged view of

[0022] Figure 4 is a three-dimensional structural diagram of the connection between the BMU assembly and the first connection row provided by an embodiment of the present invention;

[0023] Figure 5 is a three-dimensional diagram of a BMU bracket provided by an embodiment of the present invention from one viewing angle;

[0024] Figure 6 is a stereoscopic diagram of a BMU bracket provided by an embodiment of the present invention from another viewing angle;

[0025] Figure 7 is a three-dimensional diagram of a first connection row provided by an embodiment of the present invention;

[0026] Figure 8 is a perspective view of a fuse assembly provided by a first embodiment of the present invention;

[0027] Fig. 9 is a stereoscopic diagram of the fuse assembly provided by the first embodiment of the present invention from another viewing angle;

[0028] Fig.10 is an internal structure diagram of a battery pack provided by a second embodiment of the present invention;

[0029] Fig.11 is a perspective view of a fuse assembly provided by a second embodiment of the present invention;

[0030] Fig.12 It is a three-dimensional diagram of a heat-conducting bracket provided in a second embodiment of the present invention.

[0031] 10. Battery pack;

[0032] 1. Box body; 11. Upper box body; 12. Bottom plate; 13. Accommodating cavity;

[0033] 2. Battery pack; 20. Battery;

[0034] 3. Connecting bar assembly; 31. Positive bus bar; 32. Negative bus bar; 33. Inter-battery connecting bar; 34. First connecting bar; 341. First surface; 342. Second surface; 343. First connecting section; 344. Second connecting section; 345. Third connecting section; 35. Second connecting bar; 36. Bus bar fixing seat; 37. Collection line; 371. Negative collection line; 372. Positive collection line;

[0035] 4. BMU assembly; 41. BMU; 42. BMU bracket; 43. main body; 44. second support portion; 441. first support section; 442. second support section; 45. heat dissipation hole; 46. second fixing hole; 47. heat dissipation opening; 48. buffer sheet;

[0036] 5. Fuse assembly; 51. Fuse; 511. Fuse tube; 512. Connecting piece; 513. Insulating column; 52. Fuse bracket; 521. Base; 522. Fixing part; 523. Fixing foot; 524. First fixing hole; 525. Heat dissipation hole; 531. First heat dissipation interval; 532. Second heat dissipation interval; 54. Insulating sheet; 56. Heat-conducting bracket; 561. First supporting part; 5611. Bottom wall; 5612. Side wall; 5613. Groove; 5614. First part; 5615. Second part; 562. Heat-conducting part; 563. Heat-conducting cavity; 564. Heat dissipation port;

[0037] 6. Maintenance window assembly; 61. Maintenance cover; 62. Explosion-proof valve;

[0038] 7. Connector assembly; 71. Connector bracket; 72. Manual maintenance switch; 73. Positive high voltage terminal; 74. Negative high voltage terminal; 75. Communication interface;

[0039] 8. end plate assembly; 81. end plate; 82. rectangular steel strip; DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0041] An embodiment of the present invention provides a battery pack 10, which can be a power battery pack or an energy storage battery pack. The power battery pack is used in new energy vehicles, which can be hybrid vehicles or pure electric vehicles. The energy storage battery pack can be used in energy storage containers or energy storage battery cabinets.

[0042] like Figures 1 to 3 As shown, the battery pack 10 includes a box body 1, multiple battery groups 2, a connecting bar assembly 3, a BMU (Battery Management Unit) assembly 4, a fuse assembly 5 and a maintenance window assembly 6, a connector assembly 7, and an end plate assembly 8.

[0043] The box body 1 includes an upper box body 11 and a bottom plate 12 connected to each other. The upper box body 11 and the bottom plate 12 define a receiving cavity 13 together. A portion of the receiving cavity 13 is used to receive the battery pack 2. The height of the upper box body 11 is greater than the height of the bottom plate 12. The battery pack 2 is basically located in the receiving space defined by the upper box body 11, so that the overall structure of the box body 1 is convenient for assembly and later maintenance. The bottom plate 12 is located at the bottom of the battery pack 2. The bottom plate 12 is integrated with the liquid cooling plate so that the bottom plate 12 can provide support and heat dissipation for the battery pack 2.

[0044] A plurality of battery packs 2 are arranged in the accommodation space defined by the upper box 11 and the bottom plate 12. The plurality of battery packs 2 are arranged in parallel along the first direction, and each battery pack 2 includes a plurality of batteries 20 arranged in parallel along the second direction. The battery 20 can be a cylindrical battery or a square battery. In a specific embodiment, the battery pack 10 includes four battery packs 2, and each battery pack 2 includes thirteen batteries 20.

[0045] The end plate assembly 8 includes two end plates 81 and two rectangular steel strips 82 sleeved on the outside of the two end plates 81 . An end plate is provided at both ends of each battery pack 2 , and each battery pack 2 is fixed by the two end plates 81 and the two rectangular steel strips 82 .

[0046] The BMU assembly 4 includes a BMU 41 and a BMU bracket 42. The BMU 41 is configured to monitor and manage the status of the battery pack 2, such as monitoring the voltage, current or temperature of the battery, performing balanced control of the battery, preventing overcharging and overdischarging, and communicating with other electrical components inside and outside the battery pack 10, etc., to ensure the safe and reliable operation of the battery and extend the service life of the battery. The BMU bracket 42 is fixed to the bottom plate 12 by bolts, and a plurality of second fixing holes 46 (such as Figure 5 As shown in FIG. 4 , the BMU 41 is fixed to the second fixing hole 46 of the BMU bracket 42 by means of bolts.

[0047] The connector assembly 7 includes a connector bracket 71, a manual maintenance switch 72 (MSD), a positive high-voltage terminal 73, a negative high-voltage terminal 74, a communication interface 75 and other structures. The connector assembly 7 is arranged on the right side of the battery pack 10, the connector bracket 71 is fixed on the bottom plate 12, and the manual maintenance switch 72, the positive high-voltage terminal 73, the negative high-voltage terminal 74, and the communication interface 75 are all fixed on the connector bracket 71. The manual maintenance switch 72 is used to manually disconnect the battery circuit when the battery pack needs to be maintained or when a fault occurs. The positive high-voltage terminal 73 and the negative high-voltage terminal 74 are used to form a loop with an external high-voltage circuit to realize power transmission. The communication interface 75 is used to communicate data with an external power supply device or system to realize functions such as information interaction and monitoring.

[0048] The maintenance window assembly 6 includes a maintenance cover plate 61 and an explosion-proof valve 62 connected to the maintenance cover plate. The maintenance cover plate 61 is detachably connected to the upper box body 11. The maintenance cover plate 61 is used to cover the maintenance window. In an embodiment provided in the present application, the maintenance cover plate 61 is used to cover the BMU assembly 4 and the fuse assembly 5. By integrating the explosion-proof valve 62 on the maintenance cover plate 61, the area where the maintenance window is located can be further increased, thereby facilitating maintenance operations.

[0049] The fuse assembly 5 includes a fuse 51 and a fuse holder 52. The fuse holder 52 is fixed to the bottom plate 12 by bolts. The fuse 51 is connected to the bottom plate 12 by an insulating column 513 (such as Figure 8 As shown in the figure, the fuse 51 is fixed on the fuse bracket 52, and the fuse 51 is used to blow in time when the current of the battery pack 10 increases abnormally, thereby protecting the circuit.

[0050] Along the width direction of the battery pack 10, Figure 2 In the Y direction shown, the BMU assembly 4, the fuse assembly 5 and the connector assembly 7 are arranged at the same end of the battery pack 2, and the fuse assembly 5 is fixed between the BMU assembly 4 and the connector assembly 7, which is beneficial to improving the compactness of the structure of the battery pack 10.

[0051] The connecting bar assembly 3 includes a plurality of positive bus bars 31, a plurality of negative bus bars 32, a battery pack connecting bar 33, a first connecting bar 34, a second connecting bar 35, a bus bar fixing seat 36 and a collection line 37, wherein the first connecting bar 34 is used to electrically connect the output end of the negative bus bar 32 and the fuse 51, and the second connecting bar 35 is used to electrically connect the fuse 51 and the manual maintenance switch 72.

[0052] Each battery pack 2 is provided with a positive bus bar 31 and a negative bus bar 32, the positive bus bar 31 is used to electrically connect the positive output terminals of multiple batteries 20 in the same battery pack 2, and the negative bus bar 32 is used to electrically connect the negative output terminals of multiple batteries 20 in the same battery pack 2. The positive bus bar 31 and the negative bus bar 32 each include a plurality of connecting bars, each connecting bar is used to connect the positive electrodes of two adjacent batteries or the negative electrodes of two adjacent batteries, and the multiple batteries 20 in the same battery pack 2 are connected in series through the bus bars.

[0053] A guide groove of a busbar fixing seat 36 is provided on the top surface of each end plate 81. The busbar fixing seat 36 is fixed in the guide groove of the end plate 81. One end of the positive busbar 31 or the negative busbar 32 is fixed to the busbar fixing seat 36 by bolts.

[0054] The collection line 37 includes a positive collection line 372 and a negative collection line 371. The positive collection line 372 is configured to be connected to each positive connection bar in the positive bus 31, and the negative collection line 371 is configured to be connected to each negative connection bar in the negative bus 32. The positive collection line 372 is arranged on one side of the positive bus 31, and the negative collection line 371 is arranged on one side of the negative bus 32. The positive collection line 372 and the negative collection line 371 of the same battery group are fixed through the same wiring harness sleeve and electrically connected to the BMU41. The BMU41 collects the voltage and current data of each battery 20 in each battery group 2 through the collection line 37.

[0055] In one embodiment provided in the present application, during the assembly process of the battery pack 10, the positive bus 31 is integrated with the positive collection line 372, and the negative bus 32 is integrated with the negative collection line 371 to form a CCS (Cells Contact System-integrated busbar) integrated incoming component, and then the CCS integrated incoming component is welded to the battery pack 2, which is beneficial to improving production efficiency.

[0056] In some embodiments provided in this application, reference is made to Figures 2 to 4The BMU bracket 42 includes a main body 43 and a second support portion 44 connected to each other. The main body 43 is used to fix the BMU 41, and the second support portion 44 is used to fix the first connection row 34. By fixing the first connection row 34 to the BMU bracket 42, the first connection row 34 can be effectively prevented from loosening due to severe vibration of the battery pack 10. In addition, the BMU and the first connection row 34 are integrated and fixed on the same BMU bracket 42, which can make the internal structure of the battery pack 10 more compact, which is conducive to optimizing the performance of the battery pack 10.

[0057] In some embodiments, reference Figures 4 to 7 The main body 43 of the BMU bracket 42 is a planar structure, with two side walls connected to the two sides of the main body 43, and a bottom wall connected to the bottom end of the main body 43, and the bottom wall is connected to the bottom plate 12 by bolts. Four second fixing holes 46 are provided on the main body 43, two of which are provided near the top of the main body 43, and the other two second fixing holes 46 are provided near the bottom end of the main body 43, and there is a sufficient interval between the second fixing holes 46 and the bottom wall, so that the four corners of the BMU 41 are fixed to the four second fixing holes 46 by four bolts, and a sufficient heat dissipation interval is formed between the BMU 41 and the two side walls and the bottom wall of the BMU bracket 42.

[0058] Continue to refer Figures 4 to 7 A heat dissipation structure is provided on the main body 43 of the BMU bracket 42, and the heat dissipation structure includes at least two heat dissipation holes 45 provided on the main body 43 and a heat dissipation opening 47 provided at the top of the main body 43. The heat dissipation opening 47 is located between the two second fixing holes 46. The BMU 41 can fully dissipate heat through the at least two heat dissipation holes 45 and the heat dissipation opening 47 and the interval between the BMU 41 and the two side walls and the bottom wall of the BMU bracket 42.

[0059] In a specific embodiment, reference Figure 5 and Figure 6 The main body 43 of the BMU bracket 42 is provided with two groups of second fixing holes 46, one group of the second fixing holes 46 includes two third fixing holes 461, and the other group of the second fixing holes 46 includes two fourth fixing holes 462. The two third fixing holes 461 are provided at the top of the main body 43, and the two fourth fixing holes 462 are provided near the bottom of the main body 43. A heat dissipation opening 47 is provided between the two third fixing holes 461, and two heat dissipation holes 45 are provided between the two fourth fixing holes 462.

[0060] In a specific implementation, four heat dissipation holes 45 are provided on the main body 43 of the BMU bracket 42, and the BMU bracket 42 is provided with two second support parts 44. The four heat dissipation holes 45 are divided into two groups, each group is provided with two heat dissipation holes 45, and two second support parts 44 are correspondingly provided at the group of heat dissipation holes 45 arranged near the top of the main body 43, and each second support part 44 is arranged corresponding to a heat dissipation hole 45. In other optional embodiments, two heat dissipation holes are provided on the main body 43 of the BMU bracket 42, and a second support part 44 is provided on the heat dissipation hole arranged near the top of the main body 43.

[0061] Along the length direction of the battery pack 10, Figure 2 In the X direction shown, the second support portion 44 is located on a side of the main body 43 close to the multiple battery packs 2. It is understandable that the first connection row 34 needs to be electrically connected to the battery pack 2, and the second support portion 44 is arranged on a side of the main body 43 close to the battery pack 2, which is conducive to fixing the first connection row 34 between the BMU 41 and the battery pack 2, thereby making the internal structure of the battery pack 10 more compact.

[0062] In a specific implementation, continue to refer to Figure 4 and Figure 5 The second support portion 44 includes a first support segment 441 and a second support segment 442, the first support segment 441 and the second support segment 442 are bent and connected, the first support segment 441 is connected between the main body 43 and the second support segment 442, and the first support segment 441 extends from the wall where the heat dissipation hole 45 is located toward the direction close to the battery pack 2. Specifically, the first support segment 441 is substantially perpendicular to the main body 43. The second support segment 442 is perpendicular to the first support segment 441, and the second support segment 442 extends toward the direction close to the top surface of the battery pack 2. The second support portion 44 is integrally constructed as a bent hook-shaped structure, the first connection row 34 is sandwiched between the second support segment 442 and the main body 43, and is supported by the first support segment 441, so that the first connection row 34 can be stably fixed on the BMU bracket 42.

[0063] The first supporting section 441 is configured to extend from the wall where the heat dissipation hole 45 is located toward the battery pack 2 , which is beneficial for the integral formation of the main body 43 and the second supporting section 44 .

[0064] In some embodiments, continue to refer to Figures 4 to 7Two buffer sheets 48 are further provided between the BMU bracket 42 and the first connection row 34. The first connection row 34 includes a first surface 341 and a second surface 342 opposite to each other, wherein one buffer sheet 48 is provided between the first surface 341 and the main body 43, and the other buffer sheet 48 is provided between the second surface 342 and the second support section 442. By providing the buffer sheets 48 between the BMU bracket 42 and the first connection row 34, the first connection row 34 is interference-fitted on the BMU bracket 42, so as not to shake.

[0065] In some embodiments, continue to refer to Figure 4 and Figure 7 The first connection bar 34 includes a first connection section 344, a second connection section 345 and a third connection section 346 which are bent and connected in sequence. The first connection section 344 is electrically connected to the output end of the negative busbar 32 of the battery pack 2, and one end of the first connection section 344 and the negative busbar 32 are both fixed to the top surface of the busbar fixing seat 36. The second connection section 345 is fixed to the BMU bracket 42, and the third connection section 346 is connected to one end of the fuse 51. The first connection section 344 is bent relative to the second connection section 345 and extends to the top of the end plate 81, and continues to be bent on the top surface of the busbar fixing seat 36. The third connection section 346 is bent relative to the second connection section 345 toward the direction close to the fuse 51.

[0066] In the related art, the fuse 51 is usually directly fixed inside the battery box, and the fuse will generate heat when working. If the heat cannot be dissipated in time, it will affect the normal operation and reliability of the fuse.

[0067] In one embodiment of the present application, Figure 2 , Figure 3 , Figures 8 to 12 As shown, a heat dissipation structure is provided between the fuse holder 52 and the fuse 51, and the heat dissipation structure is used to dissipate heat for the fuse 51. By providing the heat dissipation structure, the heat generated by the fuse 51 during operation can be dissipated through the heat dissipation structure, so that the fuse 51 can work normally and improve the safety performance of the battery pack.

[0068] In a specific implementation, Figure 8 and Fig. 9 As shown, the fuse holder 52 includes a base portion 521 and a fixing portion 522 connected vertically, wherein the base portion 521 is substantially parallel to the end surface of the battery pack 2, and the fixing portion 522 is parallel to the bottom plate 12. The base portion 521 abuts against the end plate 81, and the fixing portion 522 includes two fixing legs 523, each of which is provided with a fixing hole 524, and the fixing hole 524 is provided as a through hole for a bolt to fix the fuse holder 52 to the bottom plate 12.

[0069] The fuse 51 includes a fuse tube 511, two connecting pieces 512 and two insulating posts 513. The fuse tube 511 is usually made of high temperature resistant insulating material. A fuse is installed inside the fuse tube 511. When the current of the circuit connecting the battery pack 2 of the battery pack and the external load is normal, the fuse allows the current to pass without melting. When the circuit connecting the battery pack 2 of the battery pack and the external load is overloaded or short-circuited, the current will increase rapidly, thereby generating a large amount of heat, causing the temperature of the fuse to rise sharply. When the melting point of the fuse is reached, the fuse melts, thereby disconnecting the circuit connection between the battery pack 2 and the external load. The two connecting pieces 512 are respectively connected to the two ends of the fuse tube 511, and each connecting piece 512 is connected to the base 521 of the fuse holder 51 through an insulating post 513.

[0070] The heat dissipation structure is set as a heat dissipation interval, along the length direction of the battery pack 10, the length direction of the battery pack 10 is set as Figure 2 In the X direction shown in FIG. 1 , a first heat dissipation gap 531 is formed between the base portion 521 of the fuse holder 52 and the fuse tube 511 of the fuse 51. In the height direction of the battery pack 10, the height direction of the battery pack 10 is set to Figure 2 In the Z direction shown, a second heat dissipation gap 532 is formed between the bottom end surface where the fixing portion 522 of the fuse holder 52 is located and the fuse tube 511 of the fuse 51. The heat generated by the fuse tube 511 of the fuse 51 during operation can directly enter the first heat dissipation gap 531 and the second heat dissipation gap 532. The fuse 51 is fixed to the bottom plate 12 of the box body 1 through the fuse holder 52, and the bottom plate 12 of the box body 1 is integrated with a liquid cooling plate, so that the heat generated by the fuse 51 can be quickly heat-exchanged with the bottom plate 12 after being diffused in the first heat dissipation gap 531 and the second heat dissipation gap 532.

[0071] Continue to refer Figure 8 and Fig. 9 The fuse assembly 5 further includes an insulating sheet 54, which is fixed to the base 521 of the fuse holder 52 and disposed at the bottom of the insulating column 513 of the fuse 51 and the base 521 of the fuse holder 52, thereby enhancing the insulation performance of the fuse assembly 5. Specifically, one end of each insulating column 513 is electrically connected to a connecting sheet 512 of the fuse 51, and the other end of each insulating column 513 is disposed through the insulating sheet 54 and the base 521 of the fuse holder 51 in sequence.

[0072] In another embodiment provided in the present application, Figures 10 to 12As shown, the heat dissipation structure includes a heat-conducting bracket 56, which is connected to the fuse bracket 52. The heat-conducting bracket 56 includes a supporting portion 561 and a heat-conducting portion 562 connected to each other. The fuse 51 is fixed on the supporting portion 561. The heat-conducting portion 562 is provided with a heat-conducting cavity 563. The heat-conducting material is provided in the heat-conducting cavity 563. The heat-conducting material can be a heat-conducting glue. The supporting portion 561 is provided with a heat dissipation port 564 connected to the heat-conducting cavity 563. The heat generated by the fuse 51 fixed on the supporting portion 561 enters the heat-conducting cavity 563 through the heat dissipation port 564 and is absorbed by the heat-conducting material inside the heat-conducting cavity 563.

[0073] The fuse holder 52 includes a base portion 521 and a fixing portion 522 which are vertically connected, wherein the base portion 521 is substantially parallel to the end surface of the battery pack 2, and the fixing portion 522 is parallel to the bottom plate 12. The base portion 521 abuts against the end plate 81, and the fixing portion 522 includes two fixing legs 523, each of which is provided with a fixing hole 524, and the fixing hole 524 is provided as a through hole for a bolt to fix the fuse holder 52 to the bottom plate 12.

[0074] The support portion 561 of the heat-conducting bracket 56 includes a bottom wall 5611 and a side wall 5612 connected vertically, and the bottom wall 5611 is set as a curved surface, so that the melting tube 511 of the fuse 51 can be placed on the bottom wall 5611. A heat dissipation port 564 is set at the center of the bottom wall 5611, so as to facilitate the uniform diffusion of the heat generated by the melting tube 511 of the fuse 51 through the heat dissipation port 564.

[0075] Continue to refer Fig.11 and Fig.12 The bottom wall 5611 further includes a groove 5613, and the heat dissipation port 564 is located at the bottom surface where the groove 5613 is located. The bottom surface where the groove 5613 is located includes a first portion 5614 and a second portion 5615, wherein the first portion 5614 is arranged close to the heat dissipation port 564, and the second portion 5615 is arranged away from the heat dissipation port 564, and the first portion 5614 is lower than the second portion 5615, and the fuse 51 is supported on the second portion 5615. By providing the bottom wall 5611 with a groove 5613 structure, the groove 5613 includes a first portion 5614 and a second portion 5615 of different heights, so that the groove 5613 is fully adapted to the fuse tube 511 of the fuse 51. It is understandable that the fuse tube 511 is generally arranged in a cylindrical structure, the second portion 5615 with a higher height is arranged to support the two ends of the fuse 51, and the first portion 5614 with a lower height is arranged to fully accommodate the fuse tube 511, so that the fuse 51 can be stably supported on the bottom wall 5611.

[0076] The first portion 5614 with a lower height is close to the heat dissipation port 564, and the heat dissipation port 564 is spaced apart from the heating main body fuse tube 511 of the fuse 51 to prevent the fuse tube 511 from blocking the end opening of the heat dissipation port 564 when placed in the groove 5613, thereby affecting the heat dissipation effect.

[0077] The side wall 5612 is fixed on the base 521 of the fuse holder 52, and both the side wall 5612 and the base 521 of the fuse holder 52 are provided with through holes. The two ends of the fuse tube 511 of the fuse 51 are provided with connecting pieces 512, one end of each insulating column 513 is electrically connected to the connecting piece 512, and the other end of each insulating column 513 passes through the through hole on the side wall 5612 of the heat-conducting holder 56 and the through hole on the base 521 of the fuse holder 52 in sequence. Since the heat-conducting holder 56 is made of plastic material, the side wall 5612 of the heat-conducting holder 56 can further enhance the insulation effect between the insulating column 513 and the fuse holder 52.

[0078] Continue to refer Figures 10 to 12 The heat conducting portion 562 of the heat conducting bracket 56 is configured as a hollow quadrangular prism structure, one end of the heat conducting portion 562 is connected to the heat dissipation port 564 of the bottom wall 5611, and the other end of the heat conducting portion 562 is fixed to the bottom plate 12 of the box body 1. Since the bottom plate 12 of the box body 1 is integrated with a liquid cooling plate structure, the heat generated by the fuse 51 enters the heat conducting cavity 563 through the heat dissipation port 564, and after passing through the heat conducting cavity 563, sufficient heat exchange is performed with the bottom plate 12.

[0079] The fixing portion 522 of the fuse holder 52 includes two fixing legs 523 arranged at an interval. Each fixing leg 523 is provided with a fixing hole 524. The fixing hole 524 is configured to allow a bolt to pass through so as to fix the fuse holder 52 to the bottom plate 12 of the box body 1. A gap is provided between the two fixing legs 523. The heat conducting portion 562 passes through the gap and abuts against the bottom plate 12.

[0080] An embodiment of the present application also provides an energy storage system, which may be an energy storage container or an energy storage battery cabinet. The energy storage system includes a battery rack and a plurality of battery packs arranged on the battery rack, and each battery pack includes the battery pack provided in the above embodiment.

[0081] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack, characterized in that: include: The box body is provided with a containing cavity; A plurality of battery packs are arranged in the accommodating cavity; A fuse assembly, the fuse assembly comprising a fuse and a fuse holder, the fuse being electrically connected to the plurality of battery packs, the fuse holder fixing the fuse; wherein a heat dissipation structure is provided between the fuse holder and the fuse, the heat dissipation structure being used to dissipate heat for the fuse.

2. The battery pack according to claim 1, characterized in that: The heat dissipation structure includes a heat-conducting bracket, which includes a first supporting part and a heat-conducting part. The first supporting part is provided with a heat dissipation port. The heat-conducting part is connected to the first supporting part and is provided with a heat-conducting cavity connected to the heat dissipation port. The fuse is supported on a side of the first supporting part away from the heat-conducting part and opposite to the heat dissipation port.

3. The battery pack according to claim 2, characterized in that: The first supporting portion is further provided with a groove, the heat dissipation port is provided on the bottom surface of the groove, the bottom surface of the groove includes a first portion close to the heat dissipation port and a second portion away from the heat dissipation port; wherein the fuse is supported on the second portion.

4. The battery pack according to claim 3, characterized in that: The fuse is spaced apart from the end surface of the heat dissipation port.

5. The battery pack according to claim 3, characterized in that: The fuse bracket includes a base portion and a fixing portion connected in a bending manner, and the fixing portion is fixed to the bottom plate of the box body; the first supporting portion of the heat-conducting bracket includes a bottom wall and a side wall connected in a bending manner, the bottom wall supports the fuse and is provided with the heat dissipation port and the groove, and the side wall is fixed to the base portion.

6. The battery pack according to claim 5, characterized in that: The fuse includes a fuse tube and two connecting pieces electrically connected to the two ends of the fuse tube respectively. The fuse assembly also includes two insulating columns, one end of each of the insulating columns is connected to the connecting pieces, and the other end of each of the insulating columns passes through the side wall of the first supporting portion and the base portion of the fuse bracket in sequence.

7. The battery pack according to claim 5, characterized in that: One end of the heat-conducting portion is connected to the heat dissipation opening of the bottom wall, and the other end of the heat-conducting portion is abutted against the bottom plate of the box body.

8. The battery pack according to claim 7, characterized in that: The fixing portion of the fuse holder includes two fixing legs, and the two fixing legs are fixed to the bottom plate of the box body; wherein a gap is provided between the two fixing legs, and the other end of the heat conducting portion passes through the gap and abuts against the bottom plate of the box body.

9. The battery pack according to claim 1, characterized in that: The heat dissipation structure includes a first heat dissipation gap and a second heat dissipation gap, the fuse bracket includes a base portion and a fixing portion that are bent and connected, the fixing portion is fixed to the bottom plate of the box body, and the fuse is fixed to the base portion, along the length direction of the battery pack, the first heat dissipation gap is arranged between the base portion and the fuse, and / or, along the height direction of the battery pack, the second heat dissipation gap is arranged between the bottom end surface of the fixing portion and the fuse.

10. The battery pack according to claim 9, characterized in that: The fuse includes a fuse tube and two connecting pieces electrically connected to the two ends of the fuse tube respectively. The fuse assembly also includes an insulating piece and two insulating columns. The insulating piece is fixed on the base portion of the fuse holder, one end of each insulating column is connected to one of the connecting pieces, and the other end of each insulating column passes through the insulating piece and the base portion of the fuse holder in sequence.

11. The battery pack according to any one of claims 1 to 10, characterized in that: It also includes a BMU assembly located on one side of the fuse assembly, and a connector assembly located on the other side of the fuse assembly, wherein the connector assembly is electrically connected to the BMU assembly and the fuse assembly, and the BMU assembly, the fuse assembly and the connector assembly are located at the same end of the battery pack.

12. The battery pack according to claim 11, characterized in that: The BMU assembly includes a BMU and a BMU bracket for fixing the BMU, and the BMU is electrically connected to the multiple battery packs; the battery pack also includes a first connecting row, and the first connecting row is electrically connected between the multiple battery packs and the fuses. The BMU bracket includes a main body and a second supporting part that are connected to each other, and the main body fixes the BMU, and the second supporting part supports the first connecting row.

13. An energy storage system, characterized in that: The energy storage system includes a plurality of battery packs and a battery rack for fixing the plurality of battery packs, and the battery pack is configured as the battery pack according to any one of claims 1-12.

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