Battery pack

Abstract

The utility model discloses a battery pack, and relates to the technical field of batteries. The battery pack comprises a first liquid cooling plate, at least two battery packs, first heat-conducting glue and a second liquid cooling plate. The first liquid cooling plate extends along the length direction of the battery pack. The at least two battery packs are arranged at intervals in the width direction of the battery pack and are arranged on the first liquid cooling plate. The first heat-conducting glue is arranged between the first liquid cooling plate and the battery pack; the second liquid cooling plate extends along the length direction of the battery pack and is arranged between two adjacent battery packs in the width direction of the battery pack. A glue blocking groove is formed in the side, facing the battery pack, of the first liquid cooling plate, and the glue blocking groove is filled with the first heat-conducting glue. The two surfaces of the battery pack are cooled, the cooling effect is enhanced, and the first liquid cooling plate can prevent glue overflow while cooling the bottom of the battery pack.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery pack. BACKGROUND

[0002] In order to meet the increasing demand for high-power discharge and fast charging, the energy density of the battery is continuously improved, and the heat generated by the battery during use is also increasing, therefore, it is necessary to set a liquid cooling plate in the battery to cool the battery.

[0003] The size of the new generation of battery monomers is large, the capacity is high, and the heat generated by the corresponding battery monomers is increased, and the weight of the battery monomers is heavy, therefore, the heat is multiplied after the battery monomers are grouped. However, since the liquid cooling plate is usually arranged at the bottom of the battery pack, such arrangement not only makes the heat dissipation area small and the heat dissipation efficiency low. In order to improve the heat dissipation efficiency of the battery group, a heat-conducting adhesive is usually arranged between the liquid cooling plate and the battery group, but since the heat-conducting adhesive has fluidity and viscosity, there is a problem of adhesive overflow during assembly. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a battery pack to solve the technical problems of poor heat dissipation and adhesive overflow after the battery monomers are grouped.

[0005] In a first aspect, the present application provides a battery pack, comprising: a first liquid cooling plate extending along the length direction of the battery pack; at least two battery groups arranged at intervals in the width direction of the battery pack and arranged on the first liquid cooling plate; a first heat-conducting adhesive arranged between the first liquid cooling plate and the battery groups; and a second liquid cooling plate extending along the length direction of the battery pack and arranged between the adjacent two battery groups in the width direction of the battery pack; wherein the first liquid cooling plate is provided with a glue blocking groove on the side facing the battery group, and the first heat-conducting adhesive is filled in the glue blocking groove.

[0006] In some embodiments, the first liquid cooling plate comprises at least one reinforcing rib extending along the length direction of the battery pack and arranged in the glue blocking groove to separate the glue blocking groove into at least two sub-glue blocking grooves, and each battery group is arranged in a sub-glue blocking groove; the first heat-conducting adhesive comprises at least two sub-heat-conducting adhesives, and each sub-heat-conducting adhesive is filled in a sub-glue blocking groove.

[0007] In some embodiments, the first liquid cooling plate further comprises: a first plate on the side of the first liquid cooling plate facing the battery group, the first plate comprising a bottom plate, two oppositely arranged first ribs, two oppositely arranged second ribs and a reinforcing rib, and the reinforcing rib being arranged on the bottom plate; each first rib extends along the length direction of the battery pack and is arranged on the side edge of the bottom plate in the length direction of the battery pack; each second rib extends along the width direction of the battery pack and is arranged on the side edge of the bottom plate in the width direction of the battery pack; wherein the bottom plate, the first rib, the second rib and the reinforcing rib jointly enclose to form a sub-glue blocking groove.

[0008] In some embodiments, the first liquid cooling plate further comprises: a second plate arranged opposite to the first plate in the height direction of the battery pack; two first side plates, each first side plate extending in the length direction of the battery pack and connected between the first rib and the second plate in the height direction of the battery pack, the two first side plates, the first plate and the second plate collectively enclosing a first liquid cooling cavity; a plurality of first partition plates, each first partition plate arranged in the first liquid cooling cavity to divide the first liquid cooling cavity into a plurality of first liquid cooling flow channels; and two first plug assemblies arranged at two ends of the first liquid cooling flow channel respectively for plugging the first liquid cooling flow channel.

[0009] In some embodiments, the first liquid cooling plate further comprises: a first support plate arranged between the first rib and the second plate and located between the first side plate and the first partition plate closest to the first side plate;

[0010] a second support plate arranged between the reinforcing rib and the second plate and located between the two adjacent first partition plates.

[0011] In some embodiments, the first liquid cooling flow channel comprises a first sub-flow channel and a second sub-flow channel, the first sub-flow channel and the second sub-flow channel being arranged in the width direction of the battery pack and being in communication;

[0012] The battery pack further comprises a first liquid inlet and a first liquid outlet, the first liquid inlet being in communication with the first sub-flow channel, and the first liquid outlet being in communication with the second sub-flow channel.

[0013] In some embodiments, the second liquid cooling plate comprises: a third plate; a fourth plate arranged opposite to the third plate in the height direction of the battery pack; and two second side plates arranged opposite to each other, each second side plate extending in the length direction of the battery pack and connected between the third plate and the fourth plate in the height direction of the battery pack, the two second side plates, the third plate and the fourth plate collectively enclosing a second liquid cooling cavity; a second partition plate arranged in the second liquid cooling cavity to divide the second liquid cooling cavity into two second liquid cooling flow channels; and two second plugs arranged at two ends of the second liquid cooling flow channel respectively for plugging the second liquid cooling flow channel; the battery pack further comprises a second liquid inlet and a second liquid outlet, the second liquid inlet being in communication with the third sub-flow channel, and the second liquid outlet being in communication with the fourth sub-flow channel.

[0014] In some embodiments, the first liquid inlet, the first liquid outlet, the second liquid inlet and the second liquid outlet are arranged on the same side.

[0015] In some embodiments, the thickness of the sub-heat-conducting adhesive is less than or equal to the depth of the sub-adhesive-blocking groove; the thickness of the sub-heat-conducting adhesive is 1-2 mm.

[0016] In some embodiments, the battery pack comprises a plurality of battery monomers arranged along the length direction of the battery pack, each battery monomer comprises a liquid injection hole arranged to face the second liquid cooling plate in the width direction of the battery pack, and a burst valve arranged away from the second liquid cooling plate in the width direction of the battery pack.

[0017] In some embodiments, the battery pack further comprises two end plate assemblies respectively arranged at two ends of the battery pack in the length direction of the battery pack, a top cover arranged on the side of the battery pack away from the first liquid cooling plate in the height direction of the battery pack, and two heat insulation assemblies each extending along the width direction of the battery pack and arranged between the end plate assembly and the battery pack; wherein the top cover is provided with a first through hole in the height direction of the battery pack; the end plate assembly is provided with a second through hole in the height direction of the battery pack; the first liquid cooling plate is provided with a third through hole in the height direction of the battery pack; and the battery pack further comprises a fixing piece sequentially arranged in the first through hole, the second through hole and the third through hole.

[0018] The technical effect of the utility model lies in that two liquid cooling plates are designed in the battery pack, which are a first liquid cooling plate and a second liquid cooling plate, the first liquid cooling plate radiates the bottom surface of the battery pack, and the second liquid cooling plate radiates the side surface of the battery pack, so that the two surfaces of the battery pack are radiated, and the heat dissipation effect is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0019] The technical scheme and other beneficial effects of the present application will become apparent through the following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings.

[0020] Figure 1 The overall structure schematic diagram of the battery pack provided by the embodiments of the present application is shown.

[0021] Figure 2 The exploded structure schematic diagram of the battery pack provided by the embodiments of the present application is shown.

[0022] Figure 3 The structure schematic diagram of the first liquid cooling plate provided by the embodiments of the present application is shown.

[0023] Figure 4 The local enlarged view of the first liquid cooling plate provided by the embodiments of the present application is shown.

[0024] Figure 5 The structure schematic diagram of the second liquid cooling plate provided by the embodiments of the present application is shown. Figure 1 .

[0025] Figure 6 The structure schematic diagram of the second liquid cooling plate provided by the embodiments of the present application is shown.Figure 2 .

[0026] Figure 7 Structure diagram of second liquid cooling plate provided for an embodiment of the present application Figure 3 .

[0027] Figure 8 Structure diagram of battery monomer provided for an embodiment of the present application Figure 1 .

[0028] Figure 9 Structure diagram of battery monomer provided for an embodiment of the present application Figure 2 .

[0029] Figure 10 Partial structure diagram of battery pack provided for an embodiment of the present application.

[0030] Figure 11 Structure diagram of end plate assembly provided for an embodiment of the present application.

[0031] Figure 12 Structure diagram of top cover provided for an embodiment of the present application.

[0032] The components in the drawings are identified as follows:

[0033] X length direction; Y width direction; Z height direction;

[0034] 1 first liquid cooling plate; 121 glue blocking groove; 1211 sub glue blocking groove;

[0035] 11 first plate; 111 reinforcing rib; 112 first rib; 113 second rib; 114 bottom plate;

[0036] 12 second plate; 13 first side plate; 14 first partition plate; 15 first plug assembly; 151 first plug; 16 first support plate; 17 second support plate; 100 first liquid cooling cavity; 101 first liquid cooling flow channel; 1011 first sub flow channel; 1012 second sub flow channel;

[0037] 2 battery pack; 21 first battery pack; 22 second battery pack; 201 battery monomer; 2011 shell;

[0038] 2012 first side end cover; 2013 second side end cover; 2014 pole; 2015 explosion-proof valve; 2016 liquid injection hole;

[0039] 3 first thermal conductive glue; 31 sub thermal conductive glue;

[0040] 4 second liquid cooling plate; 41 third plate; 42 fourth plate; 43 second side plate; 44 second partition plate; 45 second plug; 200 second liquid cooling cavity; 221 second liquid cooling flow channel;

[0041] 51 first liquid inlet; 52 first liquid outlet; 53 second liquid inlet; 54 second liquid outlet; 6 second thermal conductive glue;

[0042] 7 end plate assembly; 71 end plate;

[0043] 8 top cover;

[0044] 9 thermal insulation assembly; 91 thermal insulation plate;

[0045] 1001 fixing part; 002 protective plate;

[0046] 2001 first through hole; 2002 second through hole; 2003 third through hole. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper", "lower", "left", "right" generally refer to the upper, lower, left and right of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings.

[0048] In the present application, the term "parallel" not only includes the case of absolute parallel, but also includes the case of approximate parallel commonly recognized in engineering, such as "parallel" refers to the angle formed by a straight line and a straight line, a straight line and a surface, or a surface and a surface is-1°-1°; at the same time, "perpendicular" also includes not only the case of absolute perpendicular, but also the case of approximate perpendicular commonly recognized in engineering, such as "perpendicular" refers to the angle formed by a straight line and a straight line, a straight line and a surface, or a surface and a surface is 89°-91°. The equal distance or equal angle not only includes the case of absolute equality, but also includes the case of approximate equality commonly recognized in engineering, that is, there can be a certain error, such as the tolerance range is-1%-1%.

[0049] In the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "stacked" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0051] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. For the sake of brevity and clarity, descriptions of all possible combinations are not provided in the present application. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application can repeatedly refer to reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0052] To solve the technical problems of poor heat dissipation and glue overflow after the battery monomer is grouped. The application provides a battery pack, which comprises a first liquid cooling plate, at least two battery groups, a first heat-conducting glue and a second liquid cooling plate. The first liquid cooling plate extends along the length direction of the battery pack. The at least two battery groups are arranged in the width direction of the battery pack and are arranged on the first liquid cooling plate. The first heat-conducting glue is arranged between the first liquid cooling plate and the battery group. The second liquid cooling plate extends along the length direction of the battery pack and is arranged between the adjacent two battery groups in the width direction of the battery pack. The first liquid cooling plate is provided with a glue blocking groove on the side facing the battery group, and the first heat-conducting glue is filled in the glue blocking groove. The battery pack provided by the application is designed with two liquid cooling plates, namely the first liquid cooling plate and the second liquid cooling plate. The first liquid cooling plate dissipates heat from the bottom surface of the battery group, and the second liquid cooling plate dissipates heat from the side surface of the battery group, so that heat is dissipated from two surfaces of the battery group, and the heat dissipation effect is enhanced. In addition, the first liquid cooling plate is provided with a glue blocking groove for accommodating the first heat-conducting glue on the side facing the battery group. In this way, the first liquid cooling plate can prevent glue overflow while dissipating heat from the bottom of the battery group. The following will be described in detail.

[0053] As shown in Figures 1-2 The battery pack has a first direction, a second direction and a third direction intersecting with each other. The first direction is the length direction X of the battery pack, the second direction is the width direction Y of the battery pack, and the third direction is the height direction Z of the battery pack.

[0054] In one embodiment, the battery pack comprises a first liquid cooling plate 1, at least two battery groups 2, a first heat-conductive glue 3, and a second liquid cooling plate 4.

[0055] The first liquid cooling plate 1 extends along the length direction X of the battery pack. The at least two battery groups 2 are arranged at intervals in the width direction Y of the battery pack and are arranged on the first liquid cooling plate 1. The first heat-conductive glue 3 is arranged between the first liquid cooling plate 1 and the battery groups 2. The second liquid cooling plate 4 extends along the length direction X of the battery pack and is arranged between two adjacent battery groups 2 in the width direction Y of the battery pack. The first liquid cooling plate 1 is provided with a glue-blocking groove 121 in the height direction Z of the battery pack, and the first heat-conductive glue 3 is filled in the glue-blocking groove 121.

[0056] The first liquid cooling plate 1 cools the bottom surface of the battery group 2, and the second liquid cooling plate 4 cools the side surface of the battery group 2, so as to cool two surfaces of the battery group 2 and enhance the cooling effect. In addition, the first liquid cooling plate 1 is provided with a glue-blocking groove 121 on the side facing the battery group 2, so as to prevent glue overflow while cooling the bottom of the battery group 2.

[0057] In one embodiment, as shown in FIG. 1, the first liquid cooling plate 1 comprises at least one reinforcing rib 111 extending along the length direction X of the battery pack and arranged in the glue-blocking groove 121 to divide the glue-blocking groove 121 into at least two sub-glue-blocking grooves 1211. The first heat-conductive glue 3 comprises at least two sub-heat-conductive glues 31, each sub-heat-conductive glue 31 being filled in a sub-glue-blocking groove 1211, and each battery group 2 being arranged on a corresponding sub-heat-conductive glue 31. In this way, by arranging the glue-blocking groove 121 on the side surface of the first liquid cooling plate 1 facing the battery group 2, glue overflow is prevented while the bottom surface of the battery group 2 is cooled, and the structural strength of the battery group 2 is enhanced. Figures 1-4

[0058] In one embodiment, as shown in FIG. 1, the first liquid cooling plate 1 comprises a first plate 11 and a second plate 12 arranged opposite to the first plate 11 in the height direction Z of the battery pack. Figures 3-4

[0059] ​​The first plate 11 extends along the length direction X of the battery pack. The second plate 12 extends along the length direction X of the battery pack, and the second plate 12 is spaced apart from the first plate 11 in the height direction Z of the battery pack. Among the side of the first liquid cooling plate 1 facing the battery pack 2, the first plate 11 includes a bottom plate 114, two first ribs 112, two second ribs 113, and a reinforcing rib 111. The reinforcing rib 111 is arranged on the bottom plate 114. Each first rib 112 extends along the length direction X of the battery pack and is arranged on the side edge of the bottom plate 114 in the length direction X of the battery pack. Each second rib 113 extends along the width direction Y of the battery pack and is arranged on the side edge of the bottom plate in the width direction Y of the battery pack. Among them, the bottom plate, the first rib 112, the second rib 113 and the reinforcing rib 111 jointly enclose a sub-gel blocking groove 1211.

[0060] Each sub-heat-conducting glue 31 is filled in the sub-gel blocking groove 1211, and each battery pack 2 is at least partially arranged on one sub-heat-conducting glue 31. It can be understood that the bottom of one battery pack 2 is mostly arranged on one sub-heat-conducting glue 31, and the remaining part of the bottom of the battery pack 2 is arranged on the first rib 112, the second rib 113 and the reinforcing rib 111.

[0061] In one embodiment, as shown in Figures 3-4 The thickness of the sub-heat-conducting glue 31 is less than or equal to the depth of the sub-gel blocking groove 1211, so that by limiting the heat-conducting glue in the sub-gel blocking groove 1211, the phenomenon of glue overflow can be avoided, and the adhesion between the first liquid cooling plate 1 and the battery pack 2 can be increased, thereby enhancing the structural strength of the battery pack 2.

[0062] In one embodiment, as shown in Figures 3-4 The thickness of the sub-heat-conducting glue 31 is 1-2mm, so as to avoid the sub-gel blocking groove 1211 being too deep to affect the liquid cooling space of the first liquid cooling plate 1, and also to avoid the phenomenon of glue overflow. It can be understood that the thickness (unit: mm) of the sub-heat-conducting glue 31 can be any one value or a value between any two values of 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0.

[0063] In one embodiment, as shown in Figures 3-4 The first liquid cooling plate 1 further includes two first side plates 13, a plurality of first partition plates 14, and two first plug assemblies 15.

[0064] Each first side plate 13 extends along the length direction X of the battery pack, is connected between the first rib 112 and the second plate 12 in the height direction Z of the battery pack, and is located at the side of the second plate 12. The two first side plates 13, the first plate 11, and the second plate 12 together enclose the first liquid cooling cavity 100. Each first partition plate 14 is arranged in the first liquid cooling cavity 100 to divide the first liquid cooling cavity 100 into a plurality of first liquid cooling flow channels 101. Two first plug assemblies 15 are arranged at two ends of the first liquid cooling flow channel 101 respectively to block the first liquid cooling flow channel 101. Each first plug assembly 15 includes two first plugs 151 arranged side by side.

[0065] In one embodiment, as shown in Figure 4 The first liquid cooling flow channel 101 includes a first sub-flow channel 1011 and a second sub-flow channel 1012, and the first sub-flow channel 1011 and the second sub-flow channel 1012 are arranged and communicated in the width direction Y of the battery pack.

[0066] In one embodiment, as shown in Figure 4 The battery pack further includes a first liquid inlet 51 and a first liquid outlet 52, the first liquid inlet 51 is communicated with the first sub-flow channel 1011, and the first liquid outlet 52 is communicated with the second sub-flow channel 1012. The first sub-flow channel 1011 is an inlet flow channel, and the second sub-flow channel 1012 is an outlet flow channel, so that the cooling liquid forms a circulating loop in the first liquid cooling plate 1 to heat dissipate the bottom of the battery pack 2.

[0067] Optionally, at least one first sub-flow channel 1011 and at least one second sub-flow channel 1012 constitute a liquid cooling unit, and each liquid cooling unit is correspondingly provided with a first liquid inlet 51 and a first liquid outlet 52. Figure 1 Two liquid cooling units are shown, and each battery pack 2 is correspondingly arranged on a liquid cooling unit.

[0068] In one embodiment, as shown in Figure 4 The first liquid inlet 51 and the first liquid outlet 52 are arranged on the same side, which can save the occupied space of the battery pack in the length direction X, reduce the number of pipelines and connection points, and thus make the battery pack box accommodate more battery monomers 201 in a limited space, effectively improve the space utilization and reliability of the battery pack.

[0069] In one embodiment, as shown in Figure 4 The first liquid cooling plate 1 further includes a first support plate 16 and a second support plate 17, and the number of the first support plate 16 and the second support plate 17 is at least one, which can be set according to actual needs and is not particularly limited here.

[0070] The first support plate 16 is disposed between the first rib 112 and the second plate 12, and is located between the first side plate 13 and the first partition plate 14 closest to the first side plate 13. It can be understood that the first support plate 16 is disposed inside the first liquid cooling plate 1 along the length direction X of the battery pack, and the first support plate 16 is located near the side of the first liquid cooling plate 1, which can enhance the structural strength of the side of the first liquid cooling plate 1.

[0071] The second support plate 17 is disposed between the reinforcing rib 111 and the second plate 12, and is located between two adjacent first partition plates 14. It can be understood that the second support plate 17 is disposed inside the first liquid cooling plate 1 along the length direction X of the battery pack, and the second support plate 17 is located near the middle of the first liquid cooling plate 1, which can enhance the structural strength of the middle part of the first liquid cooling plate 1.

[0072] Therefore, when the bottom portion of the battery pack 2 is positioned on the first rib 112 and the reinforcing rib 111, the first liquid cooling plate 1 supports both sides of the battery pack 2 in the width direction Y, thereby distributing the weight of the battery pack 2 and preventing the first liquid cooling plate 1 from being squeezed and damaged, thus improving the service life of the first liquid cooling plate 1. Therefore, the first liquid cooling plate 1 not only dissipates heat from the bottom of the battery pack 2 but also bears the weight of the battery pack 2.

[0073] In one embodiment, such as Figures 5-7 As shown, the second liquid cooling plate 4 includes a third plate 41, a fourth plate 42, two second side plates 43, a second partition plate 44, and two second plugs 45.

[0074] The third plate 41 extends along the length X of the battery pack. The fourth plate 42 extends along the length X of the battery pack, and is spaced apart from the third plate 41 along the height Z of the battery pack. Each second side plate 43 extends along the length X of the battery pack and connects between the end of the first plate 11 and the end of the second plate 12. The two second side plates 43, the third plate 41, and the fourth plate 42 together form the second liquid cooling cavity 200. A second partition plate 44 is disposed within the second liquid cooling cavity 200 to divide the second liquid cooling cavity 200 into two second liquid cooling channels 221. Two second plugs 45 are respectively disposed at both ends of the second liquid cooling channels 221 to seal the second liquid cooling channels 221.

[0075] In one embodiment, the battery pack further includes a second liquid inlet 53 and a second liquid outlet 54, one of the two second liquid cooling channels 221 being connected, and the second liquid outlet 54 being connected to the other of the two second liquid cooling channels 221. One of the two second liquid cooling channels 221 is the liquid inlet channel, and the other is the liquid outlet channel, thus forming a circulation loop for the coolant within the second liquid cooling plate 4 to dissipate heat from the sides of the battery pack 2.

[0076] In one embodiment, the second liquid inlet 53 and the second liquid outlet 54 are arranged on the second plug 45.

[0077] In one embodiment, as shown in Figure 1 , Figure 4 and Figure 5 , the first liquid inlet 51, the first liquid outlet 52, the second liquid inlet 53 and the second liquid outlet 54 are arranged on the same side, which can save the space occupied by the battery pack in the length direction X, reduce the number of pipelines and connection points, and thus make the battery pack box accommodate more battery monomers 201 in a limited space, effectively improving the space utilization and reliability of the battery pack.

[0078] In one embodiment, as shown in Figure 2 , Figure 8 and Figure 9 , the battery pack 2 includes a plurality of battery monomers 201 arranged along the length direction X of the battery pack, each battery monomer 201 includes a liquid injection hole 2016 and an explosion-proof valve 2015, the liquid injection hole 2016 is arranged facing the second liquid cooling plate 4 in the width direction Y of the battery pack, and the explosion-proof valve 2015 is arranged away from the second liquid cooling plate 4 in the width direction Y of the battery pack, so that the liquid injection end and the conductive end of each battery monomer 201 are separated, to reduce the short circuit fault and improve the safety of the battery pack.

[0079] Specifically, each battery monomer 201 includes a shell 2011, a first side end cover 2012 and a second side end cover 2013.

[0080] The shell 2011 extends along the length direction X of the battery pack, and the inside of the shell 2011 is provided with an electrode assembly, electrolyte, etc. The first side end cover 2012 is arranged at one end of the shell 2011 in the length direction X of the battery pack, and the first side end cover 2012 is provided with two pole columns 2014 (positive and negative pole columns) and an explosion-proof valve 2015, and the explosion-proof valve 2015 is arranged between the two pole columns 2014. The second side end cover 2013 is arranged at the other end of the shell 2011 in the length direction X of the battery pack, and the second side end cover 2013 is provided with a liquid injection hole 2016.

[0081] In one embodiment, as shown in Figure 2 and Figure 10As shown, the battery pack 2 includes adjacent first and second battery groups 21 and 22, and the second side end cover 2013 of the battery cell 201 of the first battery group 21 is arranged opposite to the second side end cover 2013 of the battery cell 201 of the second battery group 22. The second liquid cooling plate 4 is arranged between the second side end cover 2013 of the battery cell 201 of the first battery group 21 and the second side end cover 2013 of the battery cell 201 of the second battery group 22. Therefore, one second liquid cooling plate 4 can dissipate heat from the side of the two battery groups 2, and at the same time, the space occupied by the battery pack in the width direction Y can be saved, and the number of pipelines and connection points can be reduced, so that the box of the battery pack can accommodate more battery cells 201 in a limited space, effectively improving the space utilization and reliability of the battery pack.

[0082] In one embodiment, as shown in Figure 2 , the battery pack further includes a second heat-conducting adhesive 6 arranged on the second side end cover 2013 to dissipate heat from the side of the battery group 2.

[0083] In one embodiment, as shown in Figure 2 , Figure 10 , Figure 11 and Figure 12 , the battery pack further includes two end plate assemblies 7, a top cover 8, and two thermal insulation assemblies 9.

[0084] Each end plate assembly 7 extends along the width direction Y of the battery pack, and the two end plate assemblies 7 are arranged at the two ends of the battery group 2 in the length direction X of the battery pack. Each end plate assembly 7 can include two end plates 71, and the end of the second liquid cooling plate 4 is arranged between the two end plates 71. The two end plates 71 are arranged at the two ends of the battery group 2 in the length direction X of the battery pack, and have a certain restraining effect on the expansion of the battery group 2, so as to exert a restraining force on the expansion of the battery group 2. Exerting a certain restraining force on the battery group 2 is beneficial to improving the cycle life of the battery cell. In another embodiment, the end plate assembly 7 can be an integrally formed end plate 71, and the end plate 71 is provided with an opening for allowing the end of the second liquid cooling plate 4 to pass through, so as to facilitate assembly and improve assembly efficiency.

[0085] The top cover 8 is arranged on the side of the battery group 2 away from the first liquid cooling plate 1 in the height direction Z of the battery pack.

[0086] Each thermal insulation assembly 9 extends along the width direction Y of the battery pack and is arranged between the end plate assembly 7 and the battery pack 2 to dissipate heat from the battery pack 2 on both sides of the battery pack in the length direction X. Each thermal insulation assembly 9 can include two thermal insulation plates 91, and the end of the second liquid cooling plate 4 is arranged between the two end plates 71. In another embodiment, the thermal insulation assembly 9 can be an integrally formed thermal insulation plate 91, and the thermal insulation plate 91 is provided with an opening for allowing the end of the second liquid cooling plate 4 to pass through, thus facilitating assembly and improving assembly efficiency.

[0087] The thermal insulation assembly 9 can be aerogel, which has a nano-porous network structure and is a very light, porous and excellent insulating material.

[0088] The top cover 8 is provided with a first through hole 2001 in the height direction Z of the battery pack. The end plate assembly 7 is provided with a second through hole 2002 in the height direction Z of the battery pack. The first liquid cooling plate 1 is provided with a third through hole 2003 in the height direction Z of the battery pack.

[0089] The battery pack further includes a fixing member 1001 which is sequentially arranged in the first through hole 2001, the second through hole 2002 and the third through hole 2003 to fix the top cover 8, the end plate assembly 7 and the first liquid cooling plate 1 together to enhance the structural strength of the battery pack.

[0090] In one embodiment, as shown in FIG. 1, the battery pack further includes a protective plate 1002 arranged on the first side end cover 2012 to protect the pole 2014. Figure 2

[0091] The embodiments of the present application also provide a storage energy system including a box body and a battery pack arranged in the box body. The storage energy system mainly includes a battery pack, a battery management system, an energy management system, a storage energy converter and other electrical equipment, wherein the battery system is the main component of the storage energy system. The assembly of the battery system is generally divided into three steps: (1) the battery monomer is combined into a battery pack by series and parallel connection; (2) the battery pack forms a battery cluster by series connection; (3) the battery cluster is connected in parallel to form a battery system. A large amount of heat is generated in the process of charging and discharging of the battery system, and forced air cooling or liquid cooling is usually used for cooling. Two liquid cooling plates are arranged in the battery pack, and the circulation of the fluid in the liquid cooling plate realizes the heat dissipation, heating and temperature uniformity management of the battery.

[0092] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0093] ​The above has carried out the detailed introduction to the battery pack and the energy storage system provided by the embodiment of the application, the principle and the implementation mode of the application are described in this paper, the above embodiment is only used to help understanding the technical scheme of the application and its core idea; the ordinary skilled in the art should understand that: it can still modify the technical scheme recorded by the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a first liquid cooling plate extending along a length direction of the battery pack; at least two battery groups arranged at intervals in a width direction of the battery pack and arranged on the first liquid cooling plate; a first heat-conductive adhesive arranged between the first liquid cooling plate and the battery groups; and a second liquid cooling plate extending along the length direction of the battery pack and arranged between two adjacent battery groups in the width direction of the battery pack, wherein the first liquid cooling plate is provided with a glue-blocking groove on a side facing the battery groups, and the first heat-conductive adhesive is filled in the glue-blocking groove.

2. The battery pack according to claim 1, wherein the first liquid cooling plate comprises at least one reinforcing rib extending along the length direction of the battery pack and arranged in the glue-blocking groove to divide the glue-blocking groove into at least two sub-glue-blocking grooves, the first heat-conductive adhesive comprises at least two sub-heat-conductive adhesives, each of which is filled in the sub-glue-blocking groove, and each of the battery groups is arranged on each of the sub-heat-conductive adhesives.

3. The battery pack according to claim 2, wherein the first liquid cooling plate further comprises: a first plate on the side of the first liquid cooling plate facing the battery groups, the first plate comprising a bottom plate, two oppositely arranged first ribs, two oppositely arranged second ribs, and the reinforcing rib, the reinforcing rib is arranged on the bottom plate, each of the first ribs extends along the length direction of the battery pack and is arranged on a side edge of the bottom plate in the length direction of the battery pack, each of the second ribs extends along the width direction of the battery pack and is arranged on a side edge of the bottom plate in the width direction of the battery pack, wherein the bottom plate, the first ribs, the second ribs, and the reinforcing rib jointly enclose the sub-glue-blocking groove.

4. The battery pack according to claim 3, wherein the first liquid cooling plate further comprises: a second plate arranged opposite to the first plate in a height direction of the battery pack; two first side plates, each of which extends along the length direction of the battery pack and is connected between the first rib and the second plate in the height direction of the battery pack, the two first side plates, the first plate, and the second plate jointly enclosing a first liquid cooling cavity; a plurality of first partition plates, each of which is arranged in the first liquid cooling cavity to divide the first liquid cooling cavity into a plurality of first liquid cooling flow channels; and two first plug assemblies arranged at two ends of the first liquid cooling flow channel respectively for plugging the first liquid cooling flow channel.

5. The battery pack according to claim 4, wherein the first liquid cooling plate further comprises: a first support plate arranged between the first rib and the second plate and located between the first side plate and the first partition plate closest to the first side plate; a second support plate arranged between the reinforcing rib and the second plate and located between two adjacent first partition plates.

6. The battery pack according to claim 4, wherein ​ The first liquid cooling channel comprises a first sub-channel and a second sub-channel, the first sub-channel and the second sub-channel are arranged and communicated in the width direction of the battery pack; The battery pack further comprises a first liquid inlet and a first liquid outlet, the first liquid inlet is communicated with the first sub-channel, and the first liquid outlet is communicated with the second sub-channel.

7. The battery pack of claim 6, wherein, The second liquid cooling plate comprises: a third plate; a fourth plate, which is arranged opposite to the third plate in the height direction of the battery pack; two second side plates arranged opposite to each other, each of the second side plates extends in the length direction of the battery pack and is connected between the third plate and the fourth plate in the height direction of the battery pack, and the two second side plates, the third plate and the fourth plate together enclose a second liquid cooling cavity; a second partition plate arranged in the second liquid cooling cavity to separate the second liquid cooling cavity into two second liquid cooling channels; and two second plugs arranged at two ends of the second liquid cooling channels respectively to block the second liquid cooling channels; The battery pack further comprises a second liquid inlet and a second liquid outlet, the second liquid inlet is communicated with one of the two second liquid cooling channels, and the second liquid outlet is communicated with the other of the two second liquid cooling channels.

8. The battery pack of claim 2, wherein, The thickness of the sub-heat-conducting adhesive is less than or equal to the depth of the sub-adhesive-blocking groove; The thickness of the sub-heat-conducting adhesive is 1-2 mm.

9. The battery pack of claim 1, wherein, The battery group comprises a plurality of battery monomers arranged in the length direction of the battery pack, each of the battery monomers comprises a liquid injection hole and an explosion-proof valve, the liquid injection hole is arranged to face the second liquid cooling plate in the width direction of the battery pack, and the explosion-proof valve is arranged to be away from the second liquid cooling plate in the width direction of the battery pack.

10. The battery pack of claim 1, wherein, Further comprising: two end plate assemblies arranged at two ends of the battery group in the length direction of the battery pack; and a top cover arranged on the side of the battery group away from the first liquid cooling plate in the height direction of the battery pack; and two heat insulation assemblies, each of the heat insulation assemblies extends in the width direction of the battery pack and is arranged between the end plate assembly and the battery group; The top cover is provided with a first through hole in the height direction of the battery pack; The end plate assembly is provided with a second through hole in the height direction of the battery pack; The first liquid cooling plate is provided with a third through hole in the height direction of the battery pack; The battery pack further comprises a fixing member, the fixing member is sequentially arranged in the first through hole, the second through hole and the third through hole.

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