Battery pack and energy storage system

Abstract

The utility model provides a battery pack and an energy storage system, the battery pack comprises a plurality of battery packs, and each battery pack comprises a plurality of batteries; the BMU assembly comprises a BMU and a BMU support used for fixing the BMU, and the BMU is electrically connected to the multiple battery packs; one end of the first connecting bar is electrically connected to the plurality of battery packs; wherein the BMU bracket comprises a main body part and a supporting part which are connected with each other, the main body part is used for fixing the BMU, and the supporting part is used for supporting the connecting bar.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack and an energy storage system. Background Art

[0002] The battery pack includes a BMU (Battery Management Unit) component, multiple battery packs and other electrical components, wherein the multiple battery packs are electrically connected to other electrical components through a connecting bar. The BMU component includes a BMU and a BMU bracket. The BMU bracket is only used to fix the BMU. One end of the connecting bar is electrically connected to the battery pack, and the other end of the connecting bar is electrically connected to other electrical components. Since the connecting bar only fixes its two ends, when the battery pack vibrates violently, the connecting bar will be easily loosened by the vibration, and the battery pack or other electrical components connected to it will be affected, thereby affecting the stability of the electrical connection structure of the connecting bar. Utility Model Content

[0003] The embodiments of the present invention provide a battery pack and an energy storage system, which can improve the technical problem of unstable connection of the connection bar.

[0004] In a first aspect, an embodiment of the present invention provides a battery pack, the battery pack comprising: a plurality of battery packs, each of the battery packs comprising a plurality of batteries;

[0005] A BMU assembly, comprising a BMU and a BMU bracket for fixing the BMU, wherein the BMU is electrically connected to the plurality of battery packs;

[0006] a first connecting bar, one end of which is electrically connected to the plurality of battery packs;

[0007] The BMU bracket includes a main body portion and a supporting portion connected to each other, the main body portion is used to fix the BMU, and the supporting portion is used to fix the connecting bar.

[0008] In one embodiment, along the length direction of the battery pack, the support portion of the BMU bracket is located on a side of the main body of the BMU bracket close to the plurality of battery groups.

[0009] In one embodiment, the support portion includes a first support segment and a second support segment that are bent and connected, the first support segment is connected between the second support segment and the main body, and the second support segment extends from an end of the first support segment away from the main body toward the top of the battery pack and is arranged opposite to the main body; wherein the first connecting row is clamped between the second support segment and the main body, and is supported by the first support segment.

[0010] In one embodiment, the main body of the BMU bracket is provided with heat dissipation holes, each support portion is provided corresponding to one heat dissipation hole, and the first support section of the support portion extends from the wall where the heat dissipation hole is located toward the direction close to the battery pack.

[0011] In one embodiment, a fuse is further included on one side of the BMU component, the first connecting row is used to electrically connect the plurality of battery packs and the fuse, and the fuse and the BMU component are located at the same end of the battery pack.

[0012] In one embodiment, the first connecting row includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence, the first connecting segment is connected to a plurality of battery packs, the second connecting segment is supported on the BMU bracket, and the third connecting segment is connected to the fuse, wherein the first connecting segment is bent relative to the second connecting segment toward the top of the battery pack, and the third connecting segment is bent relative to the second connecting segment toward an end away from the plurality of battery packs and close to the fuse.

[0013] In one embodiment, a buffer sheet is further included, and the buffer sheet is arranged between the main body and the second connecting section of the first connecting row; and / or the buffer sheet is arranged between the second connecting section of the first connecting row and the second supporting section.

[0014] In one embodiment, the battery pack further includes a box, the main body is fixed to the box, and a heat dissipation gap is formed between the BMU and the bottom wall of the main body and / or between the BMU and two side walls of the main body.

[0015] In one embodiment, the battery pack further includes a box body and a maintenance cover connected to the box body. The battery pack further includes a pressure relief valve, which is arranged on the maintenance cover. The maintenance cover is arranged to shield the BMU assembly and the fuse.

[0016] 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 mounting the plurality of battery packs, wherein the battery packs are configured as the above-mentioned battery packs.

[0017] Beneficial effects of the embodiments of the present utility model:

[0018] In an embodiment of the present invention, by fixing the first connecting row to the BMU bracket, the loosening of the first connecting row due to severe vibration can be effectively improved. Furthermore, the BMU bracket simultaneously fixes the BMU and the first connecting row, which can improve the compactness of the internal structure of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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.

[0020] Figure 1 is a perspective view of a battery pack provided by the implementation of the present utility model;

[0021] Figure 2 This is a diagram of the internal structure of a battery pack provided by an embodiment of the present utility model;

[0022] Figure 3 yes Figure 2 A partial enlarged view of

[0023] Figure 4 This 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 utility model;

[0024] Figure 5 This is a three-dimensional diagram of a BMU bracket provided by an embodiment of the present utility model from one perspective;

[0025] Figure 6 This is a three-dimensional diagram of a BMU bracket provided by an embodiment of the present utility model from another perspective;

[0026] Figure 7 is a perspective view of a first connection row provided in an embodiment of the present utility model;

[0027] Figure Number:

[0028] 10. Battery pack;

[0029] 1. Box body; 11. Upper box body; 12. Bottom plate;

[0030] 2. Battery pack; 20. Battery;

[0031] 3. Connecting bar assembly; 31. Positive busbar; 32. Negative busbar; 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. Busbar fixing base;

[0032] 4. BMU assembly; 41. BMU; 42. BMU bracket; 43. Main body; 44. Support portion; 441. First support section; 442. Second support section; 45. Heat dissipation holes; 46. Fixing holes; 47. Heat dissipation opening; 48. Buffer sheet;

[0033] 5. Fuse assembly; 51. Fuse; 52. Fuse holder;

[0034] 6. Maintenance window assembly; 61. Maintenance cover; 62. Explosion-proof valve;

[0035] 7. Connector assembly; 71. Connector bracket; 72. Manual maintenance switch; 73. Positive high-voltage terminal; 74. Negative high-voltage terminal; 75. Communication interface;

[0036] 8. End plate assembly; 81. End plate; 82. Rectangular steel strip; DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0038] The embodiment of the present utility model provides a battery pack 10, such as Figures 1 to 3 As shown, the battery pack 10 includes a box body 1, multiple battery groups 2, an end plate assembly 8, a connecting bar assembly 3, a BMU assembly 4, a connector assembly 7, a fuse assembly 5 and a maintenance window assembly 6.

[0039] The housing 1 comprises an upper housing 11 and a bottom plate 12, which are connected. The upper housing 11 is taller than the bottom plate 12. The battery pack 2 is essentially located within the space defined by the upper housing 11, making the overall structure of the housing 1 easy to assemble and maintain. The bottom plate 12 is located at the bottom of the battery pack 2 and is integrated with the liquid cooling plate, providing support and heat dissipation for the battery pack 2.

[0040] Multiple battery packs 2 are arranged within the housing defined by the upper case 11 and the bottom plate 12. The battery packs 2 are arranged side by side along a first direction, and each battery pack 2 includes multiple cells 20 arranged side by side along a second direction. The cells 20 can be cylindrical or prismatic. In one embodiment, the battery pack 10 includes four battery packs 2, each containing thirteen cells 20.

[0041] 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 .

[0042] The BMU assembly 4 includes a BMU 41 (battery management unit) and a BMU bracket 42. The BMU 41 is configured to monitor and manage the status of the battery pack 2, such as monitoring battery voltage, current, or temperature, performing battery balancing control, preventing overcharging and over-discharging, and communicating with other electrical components inside and outside the battery pack 10, so as to ensure the safe and reliable operation of the battery and extend the battery life. The BMU bracket 42 is fixed to the base plate 12 by bolts. A plurality of fixing holes 46 (such as Figure 5 As shown in FIG, the BMU 41 is fixed to the fixing hole 46 of the BMU bracket 42 by means of bolts.

[0043] 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 to 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 to 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 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 exchange and monitoring.

[0044] The maintenance window assembly 6 includes a maintenance cover 61 and an explosion-proof valve 62 connected to the maintenance cover. The maintenance cover 61 is detachably connected to the upper housing 11 and serves to shield the maintenance window. In one embodiment provided herein, the maintenance cover 61 shields the BMU assembly 4 and the fuse assembly 5. The integration of the explosion-proof valve 62 into the maintenance cover 61 further increases the area of ​​the maintenance window, facilitating maintenance operations.

[0045] The fuse assembly 5 includes a fuse 51, a fuse holder 52 and an insulating column (not shown). The fuse holder 52 is fixed to the base plate 12 by bolts, and the fuse 51 is fixed to the fuse holder 52 by the insulating column. The fuse 51 is used to blow in time when the current of the battery pack 10 increases abnormally, thereby protecting the circuit.

[0046] Along the width direction of the battery pack 10, as shown in FIG. Figure 2In 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 .

[0047] The connecting bar assembly 3 includes multiple positive busbars 31, multiple negative busbars 32, inter-battery connecting bars 33, a first connecting bar 34, a second connecting bar 35, and a busbar holder 36. The first connecting bar 34 is used to electrically connect the output end of the negative busbar 32 to the fuse 51, and the second connecting bar 35 is used to electrically connect the fuse 51 to the manual maintenance switch 72. Each battery pack 2 is provided with a positive busbar 31 and a negative busbar 32. The positive busbar 31 is used to electrically connect the positive output ends of the multiple batteries 20 in the same battery pack 2, and the negative busbar 32 is used to electrically connect the negative output ends of the multiple batteries 20 in the same battery pack 2. Each positive busbar 31 and negative busbar 32 includes multiple connecting tabs, each of which is used to connect the positive poles of two adjacent batteries or the negative poles of two adjacent batteries. Multiple batteries 20 in the same battery pack 2 are connected in series via the busbars. A guide groove for the 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.

[0048] In the related art, the first connecting bar 34 of the output bar for connecting the fuse 51 and the negative bus 32 of the battery pack 2 is only fixed at its two ends. When the battery pack 10 vibrates violently, the first connecting bar 34 is likely to become loose from the battery pack 2 or fuse assembly 5 connected thereto, thereby affecting the stability of the electrical connection structure of the first connecting bar 34.

[0049] In some embodiments of the present application, reference is made to Figures 2 to 4 The BMU bracket 42 includes a main body 43 and a support portion 44. The main body 43 is used to secure the BMU 41, and the support portion 44 is used to secure the first connecting bar 34. By securing the first connecting bar 34 to the BMU bracket 42, it is effectively prevented from loosening due to severe vibration of the battery pack 10. Furthermore, integrating the BMU and the first connecting bar 34 into the same BMU bracket 42 for securement makes the internal structure of the battery pack 10 more compact, which helps optimize the performance of the battery pack 10.

[0050] In some embodiments, reference Figures 4 to 6The main body 43 of the BMU bracket 42 is a planar structure with two side walls on either side. A bottom wall is connected to the bottom end of the main body 43 and bolted to the base plate 12. Four fixing holes 46 are provided in the main body 43, two of which are located near the top and the other two near the bottom. Sufficient spacing is provided between the fixing holes 46 and the bottom wall, allowing the four corners of the BMU 41 to be fixed to the four fixing holes 46 via four bolts. This creates sufficient spacing for heat dissipation between the BMU 41 and the side walls and bottom wall of the main body 43 of the BMU bracket 42.

[0051] Continue to refer Figures 4 to 6 A heat dissipation structure is provided on the main body 43 of the BMU bracket 42. 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 fixing holes 46. The BMU 41 can be fully dissipated through the at least two heat dissipation holes 45 and the heat dissipation opening 47, as well as the gaps between the BMU 41 and the two side walls and bottom wall of the BMU bracket 42.

[0052] In one embodiment, reference Figure 4 and Figure 5 The main body 43 of the BMU bracket 42 is provided with two groups of fixing holes 46. One group of fixing holes 46 includes two first fixing holes 461, and the other group of fixing holes 46 includes two second fixing holes 462. The two first fixing holes 461 are provided at the top of the main body 43, and the two second fixing holes 462 are provided near the bottom of the main body 43. A heat dissipation opening 47 is provided between the two first fixing holes 461, and two heat dissipation holes 45 are provided between the two second fixing holes 462.

[0053] In one embodiment, four heat dissipation holes 45 are provided on the main body 43 of the BMU bracket 42. The BMU bracket 42 is provided with two support portions 44. The four heat dissipation holes 45 are divided into two groups, each group having two heat dissipation holes 45, and each support portion 44 is provided corresponding to a heat dissipation hole 45. In alternative embodiments, two heat dissipation holes are provided on the main body 43 of the BMU bracket 42, and a support portion 44 is provided on the heat dissipation hole 45 located near the top of the main body 43.

[0054] In some embodiments, along the length of the battery pack, such as Figure 2In the X direction shown, the support portion 44 is located on a side of the main body 43 near the multiple battery packs 2. It is understood that the first connecting bar 34 needs to be electrically connected to the battery packs 2. Positioning the support portion 44 on the side of the main body 43 near the battery packs 2 facilitates securing the first connecting bar 34 between the BMU 41 and the battery packs 2, thereby making the internal structure of the battery pack 10 more compact.

[0055] In a specific implementation, continue to refer to Figures 4 to 7 The support portion 44 includes a first support segment 441 and a second support segment 442, which are connected by a bend. The first support segment 441 is connected between the main body 43 and the second support segment 442, and extends from the wall where the heat dissipation holes 45 are located toward 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, connected to the end of the first support segment 441 away from the main body 43, and extends toward the top surface of the battery pack 2. The support portion 44 is constructed as a whole in a bent hook-shaped structure. The first connection bar 34 is sandwiched between the second support segment 442 and the main body 43 and supported by the first support segment 441, thereby ensuring a stable fixation of the first connection bar 34 to the BMU bracket 42.

[0056] The first support 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 integrally forming the main body 43 and the support portion 44 .

[0057] In some embodiments, continue to refer to Figures 4 to 7 At least two buffer sheets 48 are disposed between the BMU bracket 42 and the first connecting row 34. The first connecting row 34 includes opposing first and second surfaces 341 and 342. One buffer sheet 48 is disposed between the first surface 341 and the main body 43, and the other buffer sheet 48 is disposed between the second surface 342 and the second support section 442. The provision of these buffer sheets 48 between the BMU bracket 42 and the first connecting row 34 ensures an interference fit between the first connecting row 34 and the BMU bracket 42, preventing any shaking.

[0058] In some embodiments, continue to refer to Figure 4 and Figure 7The first connecting bar 34 includes a first connecting segment 344, a second connecting segment 345, and a third connecting segment 346, which are bent and connected in sequence. The first connecting segment 344 is electrically connected to the output end of the negative busbar 32 of the battery pack 2. One end of the first connecting segment 344 and the negative busbar 32 are both fixed to the top surface of the busbar fixing base 36. The second connecting segment 345 is fixed to the BMU bracket 42. The third connecting segment 346 is connected to one end of the fuse 51. The first connecting segment 344 bends relative to the second connecting segment 345, extends to the top of the end plate 81, and continues to bend at the top surface of the busbar fixing base 36. The third connecting segment 346 bends relative to the second connecting segment 345 toward the fuse 51.

[0059] In the above embodiment provided in this application, the first connecting bar 34 is used to connect the fuse assembly 5 and the negative busbar 32 of the battery pack 2. In other optional embodiments, the first connecting bar 34 can also be used to connect the busbar of the battery pack 2 and other electrical components inside the battery pack, such as relays or inverters. In other optional embodiments, the first connecting bar 34 can also be a connecting bar between battery packs 2.

[0060] 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 multiple battery packs arranged on the battery rack, each battery pack including the battery pack provided in the above embodiment.

[0061] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article 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 and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery pack, characterized in that: include: a plurality of battery packs, each of said battery packs comprising a plurality of batteries; A BMU assembly, comprising a BMU and a BMU bracket for fixing the BMU, wherein the BMU is electrically connected to the plurality of battery packs; a first connecting bar, one end of which is electrically connected to the plurality of battery packs; The BMU bracket includes a main body portion and a supporting portion connected to each other, the main body portion fixes the BMU, and the supporting portion supports the first connection row.

2. The battery pack according to claim 1, wherein: Along the length direction of the battery pack, the support portion of the BMU bracket is located on a side of the main body close to the plurality of battery groups.

3. The battery pack according to claim 1, wherein: The support portion includes a first support segment and a second support segment that are bent and connected, the first support segment is connected between the second support segment and the main body, and the second support segment extends from an end of the first support segment away from the main body toward the top of the battery pack and is arranged opposite to the main body; wherein the first connecting row is clamped between the second support segment and the main body and is supported by the first support segment.

4. The battery pack according to claim 3, wherein: The main body of the BMU bracket is provided with heat dissipation holes, each of the support parts is provided corresponding to one of the heat dissipation holes, and the first support section of the support part extends from the wall where the heat dissipation hole is located toward the direction close to the battery pack.

5. The battery pack according to claim 3, wherein: It also includes a fuse located on one side of the BMU component. The first connecting row is used to electrically connect the multiple battery packs and the fuse. The fuse and the BMU component are located at the same end of the battery pack.

6. The battery pack according to claim 5, characterized in that: The first connecting row includes a first connecting segment, a second connecting segment and a third connecting segment connected in sequence, the first connecting segment is connected to multiple battery packs, the second connecting segment is supported on the BMU bracket, and the third connecting segment is connected to the fuse, wherein the first connecting segment is bent relative to the second connecting segment toward the top of the battery pack, and the third connecting segment is bent relative to the second connecting segment toward the end away from the multiple battery packs and close to the fuse.

7. The battery pack according to claim 6, characterized in that: Also included is a buffer sheet, the buffer sheet being disposed between the main body and the second connecting section of the first connecting row; And / or, the buffer sheet is arranged between the second connecting segment and the second supporting segment of the first connecting row.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The battery pack further includes a box body, the main body is fixed to the box body, and a heat dissipation gap is formed between the BMU and a bottom wall of the main body and / or between the BMU and two side walls of the main body.

9. The battery pack according to any one of claims 5 to 7, characterized in that: The battery pack further includes a box body and a maintenance cover connected to the box body. The battery pack further includes a pressure relief valve, which is arranged on the maintenance cover. The maintenance cover is arranged to shield the BMU assembly and the fuse.

10. An energy storage system, characterized in that: The energy storage system includes a plurality of battery packs and a battery rack for mounting the plurality of battery packs, and the battery pack is configured as the battery pack according to any one of claims 1 to 9.

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