Battery pack

Abstract

The utility model relates to a battery pack, the battery pack comprises a cold plate assembly and a plurality of battery cell groups, each battery cell group comprises a plurality of battery cells arranged along the length direction, the cold plate assembly is provided with a plurality of assembly spaces, and each assembly space is used for correspondingly accommodating one battery cell group; the two side faces, in the thickness direction, of the battery cell and the bottom face, in the height direction, of the battery cell are all attached to the cold plate assembly, a plurality of flow channels are formed in the cold plate assembly, and each flow channel reciprocates back and forth at the two ends of the cold plate assembly in the length direction of the battery cell; wherein the cooling liquid can circulate along the flow channel, and is used for cooling the two side surfaces, in the thickness direction, of the battery cell and the bottom surface, in the height direction, of the battery cell. The battery pack provided by the utility model can improve the heat dissipation effect on the battery cells and is relatively simple in structure.

Description

Technical Field

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

[0002] As the battery pack power and charging rate continue to increase, the heat generated by the whole pack is getting higher and higher. In order to dissipate the heat of the battery cell, bottom liquid cooling or double large-surface liquid cooling is often used in related structures. Among them, bottom liquid cooling refers to setting a liquid cooling plate at the bottom of the battery cell, and applying thermal conductive glue between the liquid cooling plate and the liquid cooling plate to fix it. The heat dissipation area is the small surface at the bottom, the thermal resistance on the heat conduction path is large, and the heat dissipation effect is average; double large-surface liquid cooling refers to attaching harmonica tubes to the two large surfaces of the battery cell for heat dissipation. The heat dissipation area is increased to two large surfaces, and the heat dissipation effect is improved, but there is also a risk of overheating when charging at a higher rate, and it is necessary to set multiple interface pipes and outlet pipes at both ends of the harmonica pipe, which makes the structure of the battery pack more complicated. Utility Model Content

[0003] Based on this, it is necessary to provide a battery pack that can improve the heat dissipation effect of the battery cell and has a relatively simple structure.

[0004] A battery pack comprises a cold plate assembly and a plurality of battery cell groups, each battery cell group comprises a plurality of battery cells arranged along a length direction, the cold plate assembly has a plurality of assembly spaces, and each assembly space is used to accommodate a corresponding battery cell group, so that the two side surfaces of the battery cell along the thickness direction and the bottom surface along the height direction are both attached to the cold plate assembly, and the cold plate assembly has a plurality of flow channels, and each flow channel is reciprocated at two ends of the cold plate assembly along the length direction of the battery cell; wherein a coolant can flow along the flow channels and cool the two side surfaces of the battery cell along the thickness direction and the bottom surface of the battery cell along the height direction.

[0005] In one embodiment, the cold plate assembly includes an end plate and multiple liquid cooling plates, the cross-section of the liquid cooling plate is L-shaped, and the multiple liquid cooling plates are arranged toward the end plate and along the thickness direction of the battery cell, so that an assembly space is formed between two adjacent liquid cooling plates, or between the liquid cooling plate and the end plate.

[0006] In one of the embodiments, the battery pack also includes a liquid inlet collector and a liquid outlet collector, a first channel is provided in the end plate, the liquid inlet end of the first channel is connected to the liquid inlet collector, and the liquid outlet end of the first channel is connected to the liquid outlet collector; each liquid cooling plate is provided with a flow channel, and the liquid inlet of the flow channel is connected to the liquid inlet collector, and the liquid outlet of the flow channel is connected to the liquid outlet collector.

[0007] In one of the embodiments, each liquid cooling plate includes a main body and a liquid inlet collector and a liquid outlet collector connected to both ends of the main body along the length direction of the battery cell, the liquid inlet is opened in the liquid inlet collector, the liquid outlet is opened in the liquid outlet collector, the main body has n second channels parallel to each other, the liquid inlet collector and the liquid outlet collector are provided with connecting cavities corresponding to the second channels, the number of connecting cavities is configured to be n-1, wherein the n second channels are connected in sequence end to end through the n-1 connecting cavities to form a flow channel, and n≥3.

[0008] In one embodiment, the main body includes a bottom plate and side plates connected to each other, the bottom plate is attached to the bottom surface of the battery cell along the height direction, and the side plate is attached to the side surface of the battery cell along the thickness direction; the number of second channels is configured to be three, one of the second channels is opened on the bottom plate, and the other two second channels are opened on the side plates.

[0009] In one embodiment, a plurality of partitions are disposed in the first channel and / or the second channel, and the plurality of partitions divide the first channel and / or the second channel into a plurality of sub-channels parallel to each other.

[0010] In one embodiment, along the height direction of the battery cell, the liquid inlet is located below the liquid outlet.

[0011] In one embodiment, the liquid inlet manifold and / or the liquid outlet manifold includes a primary tube and multiple secondary tubes, the primary tube is provided with multiple spaced-apart diversion points, each diversion point is connected to a corresponding secondary tube, and the secondary tube is provided with multiple diversion tubes, each diversion tube is connected to a corresponding liquid cooling plate or an end plate.

[0012] In one of the embodiments, the battery pack further includes a lower box body and a plurality of reinforcing ribs, the reinforcing ribs are welded to the bottom wall of the lower box body, and the cold plate assembly is crimped to the reinforcing ribs.

[0013] In one embodiment, the cross section of the reinforcing rib is in the shape of a "X", and a heat-insulating cavity is formed between the middle of the reinforcing rib and the bottom wall of the lower box body, and a heat-insulating pad is provided between the reinforcing rib and the cold plate assembly.

[0014] Compared with the prior art, the battery pack provided by the present application, by setting an assembly space on the cold plate assembly, enables the cold plate assembly to cool the two side surfaces of the battery cell in the thickness direction and the bottom surface of the battery cell in the height direction at the same time. Such a setting can effectively increase the heat dissipation area of ​​the battery cell, thereby significantly improving the heat dissipation effect of the cold plate assembly on the battery cell. In addition, compared with the related structure in which the flow channel is set to extend along the length direction of the battery cell, in the present application, since each flow channel is reciprocated at both ends of the cold plate assembly along the length direction of the battery cell, it is equivalent to connecting multiple flow channels extending along the length direction of the battery cell in the related structure end to end to form a longer flow channel, thus reducing the number of inlets and outlets of the flow channel, thereby reducing the number of inlet pipes connected to the inlet of the flow channel, and the number of outlet pipes connected to the outlet of the flow channel, which is conducive to simplifying the structure of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 An exploded diagram of the battery pack provided for this application;

[0017] Figure 2 A top view of the assembly of the battery cell group and the cold plate assembly provided in the present application;

[0018] Figure 3 for Figure 2 Sectional view at AA;

[0019] Figure 4 An axonometric view of the liquid cooling plate provided for this application;

[0020] Figure 5 An exploded schematic diagram of the liquid cooling plate provided for this application;

[0021] Figure 6 An axonometric view of the liquid inlet manifold provided in this application;

[0022] Figure 7 This is an axonometric view of the liquid outlet and flow collecting member provided in this application.

[0023] Reference numerals: 100, battery pack; 110, cold plate assembly; 111, assembly space; 112, flow channel; 112a, liquid inlet; 112b, liquid outlet; 113, end plate; 113a, first channel; 114, liquid cold plate; 114a, bottom plate; 114b, side plate; 115, main body; 115a, second channel; 115b, partition; 115c, sub-channel; 1 16. Liquid inlet collector; 116a. Connecting cavity; 117. Liquid outlet collector; 120. Cell group; 121. Cell; 130. Liquid inlet collector; 131. Primary tube; 131a. Diversion point; 132. Secondary tube; 133. Diversion tube; 140. Liquid outlet collector; 150. Lower box; 151. Crossbeam; 160. Reinforcement rib; 170. Thermal insulation pad; 180. Upper cover. DETAILED DESCRIPTION

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

[0025] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

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

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0029] See also Figures 1 to 3 The present application provides a battery pack 100, which includes a cold plate assembly 110 and a plurality of battery cell groups 120, each battery cell group 120 including a plurality of battery cells 121 arranged along a length direction, the cold plate assembly 110 having a plurality of assembly spaces 111, and each assembly space 111 is used to accommodate a corresponding battery cell group 120, and the two side surfaces along the thickness direction and the bottom surface along the height direction of the battery cell 121 are both attached to the cold plate assembly 110, and the cold plate assembly 110 has a plurality of flow channels 112, and each flow channel 112 is reciprocated at both ends of the cold plate assembly 110 along the length direction of the battery cell 121; wherein the coolant can flow along the flow channels 112, and cool the two side surfaces along the thickness direction and the bottom surface along the height direction of the battery cell 121.

[0030] It can be understood that by providing an assembly space 111 on the cold plate assembly 110, the cold plate assembly 110 can cool both sides of the battery cell 121 in the thickness direction and the bottom surface of the battery cell 121 in the height direction simultaneously. With such a setting, the heat dissipation area of the battery cell 121 can be effectively increased, thereby significantly improving the heat dissipation effect of the cold plate assembly 110 on the battery cell 121. Moreover, compared with the related structure in which the flow channels are arranged to extend along the length direction of the battery cell 121, in this application, since each flow channel 112 reciprocates and turns back at both ends of the cold plate assembly 110 along the length direction of the battery cell 121, it is equivalent to connecting multiple flow channels extending along the length direction of the battery cell 121 end to end to form a flow channel 112 with a longer length. In this way, the number of inlets and outlets of the flow channel 112 is reduced, and further, the number of inlet pipes connected to the inlets of the flow channel 112 can be reduced; and the number of outlet pipes connected to the outlets of the flow channel 112, which is beneficial to simplifying the structure of the battery pack 100.

[0031] Wherein, both sides of the battery cell 121 in the thickness direction and the bottom surface in the height direction are adhesively bonded to the cold plate assembly 110.

[0032] In one embodiment, please refer to Figure 1 As shown, the cold plate assembly 110 includes an end plate 113 and a plurality of liquid cooling plates 114. The cross-section of the liquid cooling plate 114 is L-shaped. The plurality of liquid cooling plates 114 are all arranged facing the end plate 113 and arranged along the thickness direction of the battery cell 121, so that an assembly space 111 is formed by enclosing between adjacent two liquid cooling plates 114 or between the liquid cooling plate 114 and the end plate 113. It should be noted that "the plurality of liquid cooling plates 114 are all arranged facing the end plate 113" means that the side surface of the liquid cooling plate 114 with an included angle faces the end plate 113. In this way, an "匚"-shaped assembly space 111 is respectively formed by enclosing between adjacent two liquid cooling plates 114 and between the liquid cooling plate 114 and the end plate 113, so that both sides of the battery cell 121 in the thickness direction and the bottom surface of the battery cell 121 in the height direction can exchange heat with the cold plate assembly 110 in the assembly space 111. Moreover, when the end plate 113 or one of the liquid cooling plates 114 is damaged, only the damaged end plate 113 or liquid cooling plate 114 needs to be replaced, rather than replacing the entire cold plate assembly 110, which is beneficial to cost savings. When assembling the cold plate assembly 110, the end plate 113 can be fixed first, and then a plurality of liquid cooling plates 114 can be assembled in sequence.

[0033] Furthermore, the battery pack 100 further includes a liquid inlet manifold 130 and a liquid outlet manifold 140, a first channel 113a is provided in the end plate 113, the liquid inlet end of the first channel 113a is connected to the liquid inlet manifold 130, and the liquid outlet end of the first channel 113a is connected to the liquid outlet manifold 140; each liquid cooling plate 114 is provided with a flow channel 112, and the liquid inlet 112a of the flow channel 112 is connected to the liquid inlet manifold 130, and the liquid outlet 112b of the flow channel 112 is connected to the liquid outlet manifold 140. It can be understood that the end plate 113 forms a heat exchange unit, and each liquid cooling plate 114 forms a corresponding heat exchange unit, and the above-mentioned multiple heat exchange units are connected in parallel between the liquid inlet manifold 130 and the liquid outlet manifold 140, so that each heat exchange unit can independently dissipate heat for the battery cells 121 located on the left and right sides thereof.

[0034] See also Figures 4 to 7 Each liquid cooling plate 114 includes a main body 115 and a liquid inlet collector 116 and a liquid outlet collector 117 connected to both ends of the main body 115 along the length direction of the battery cell 121, the liquid inlet 112a is opened in the liquid inlet collector 116, and the liquid outlet 112b is opened in the liquid outlet collector 117. The main body 115 has n second channels 115a parallel to each other, and the liquid inlet collector 116 and the liquid outlet collector 117 are provided with connecting cavities 116a corresponding to the second channels 115a. The number of connecting cavities 116a is configured to be n-1, wherein the n second channels 115a are connected in sequence end to end through n-1 connecting cavities 116a to form a flow channel 112, and n≥3. It can be understood that the liquid inlet collecting piece 116 is used to connect the liquid inlet collecting pipe 130 and the flow channel 112, and the liquid outlet collecting piece 117 is used to connect the flow channel 112 and the liquid outlet collecting pipe 140, and by arranging multiple connecting cavities 116a in the liquid inlet collecting piece 116 and the liquid outlet collecting piece 117, the flow channel 112 can be reciprocated at both ends of the liquid cooling plate 114 along the length direction of the battery cell 121.

[0035] Optionally, along the height direction of the battery cell 121, the liquid inlet 112a is located below the liquid outlet 112b. In this way, the coolant flows along the flow channel 112 from the bottom surface close to the battery cell 121 to the side surface close to the battery cell 121. It can be understood that the two side surfaces of the battery cell 121 along the thickness direction are the large surfaces of the battery cell 121, that is, the heat dissipation capacity of the two side surfaces of the battery cell 121 along the thickness direction is greater than the heat dissipation capacity of the bottom surface of the battery cell 121 along the height direction. By arranging the coolant to dissipate heat to the bottom surface first and then to the side surface, it is possible to avoid excessive temperature reduction of the battery cell 121 near the liquid inlet 112a, thereby avoiding a large temperature difference between the side surface and the bottom surface of the battery cell 121.

[0036] For example, in one embodiment, the main body 115 includes a bottom plate 114a and a side plate 114b connected to each other, the bottom plate 114a is attached to the bottom surface of the battery cell 121 along the height direction, and the side plate 114b is attached to the side surface of the battery cell 121 along the thickness direction; the number of second channels 115a is configured to be three, one of which is opened on the bottom plate 114a, and the other two second channels 115a are opened on the side plate 114b. Further, the liquid inlet collector 116 is provided with a liquid inlet 112a at a position close to the bottom plate 114a, and the liquid inlet collector 116 is provided with a connecting cavity 116a at a position close to the side plate 114b; the liquid outlet collector 117 is provided with a connecting cavity 116a at a position close to the junction of the bottom plate 114a and the side plate 114b, and the liquid outlet collector 117 is provided with a liquid outlet 112b at a position close to the side plate 114b. That is, in this embodiment, the three second channels 115a are connected through the two connecting cavities 116a to form an "S"-shaped flow channel 112. Specifically, the flow direction of the coolant is: the liquid inlet manifold 130-the liquid inlet 112a-the second channel 115a on the bottom plate 114a-the connecting cavity 116a-a second channel 115a on the side plate 114b-the connecting cavity 116a-another second channel 115a on the side plate 114b-the liquid outlet 112b-the liquid outlet manifold 140.

[0037] A plurality of partitions 115b are provided in the first channel 113a and / or the second channel 115a, and the plurality of partitions 115b divide the first channel 113a and / or the second channel 115a into a plurality of mutually parallel sub-channels 115c. In other words, a plurality of partitions 115b may be provided only in the first channel 113a, and the plurality of partitions 115b divide the first channel 113a into a plurality of mutually parallel sub-channels 115c, so that the interior of the first channel 113a can be further refined, so that the coolant is more evenly distributed in the first channel 113a; or a plurality of partitions 115b may be provided only in the second channel 115a, and the plurality of partitions 115b divide the second channel 115a into a plurality of mutually parallel sub-channels 115c. In this way, the interior of the second channel 115a can be further refined, so that the coolant is more evenly distributed in the second channel 115a; alternatively, multiple partitions 115b can be provided in the first channel 113a and the second channel 115a, and the multiple partitions 115b separate the first channel 113a and the second channel 115a to form multiple parallel sub-channels 115c.

[0038] See also Figure 1 and Figure 2The liquid inlet manifold 130 and / or the liquid outlet manifold 140 includes a primary tube 131 and a plurality of secondary tubes 132. The primary tube 131 is provided with a plurality of spaced-apart diversion points 131a, each diversion point 131a is connected to a corresponding secondary tube 132, and the secondary tube 132 is provided with a plurality of diversion tubes 133, each diversion tube 133 is connected to a corresponding liquid cooling plate 114 or an end plate 113. In other words, only the liquid inlet manifold 130 may be configured to include a primary tube 131 and a plurality of secondary tubes 132, so that the coolant enters the plurality of liquid cooling plates 114 more evenly after two-stage diversion in the liquid inlet manifold 130; or, only the liquid outlet manifold 140 may be configured to include a primary tube 131 and a plurality of secondary tubes 132, so that the coolant in the plurality of liquid cooling plates 114 flows out of the battery pack after two-stage convergence in the liquid outlet manifold 140; or, both the liquid inlet manifold 130 and the liquid outlet manifold 140 may be configured to include a primary tube 131 and a plurality of secondary tubes 132.

[0039] Optionally, a shunt pipe 133 near the end plate 113 is configured as a three-way joint, and three joints of the three-way joint are respectively connected to the end plate 113, the secondary pipe 132 and a liquid cooling plate 114 near the end plate 113.

[0040] Exemplarily, the number of the shunt points 131 a and the number of the diodes 132 are both configured to be two. Moreover, the two shunt points 131 a are evenly spaced apart on the diode 131 along the thickness direction of the battery cell 121 .

[0041] The battery pack 100 further includes a lower box 150 and a plurality of reinforcing ribs 160, the reinforcing ribs 160 are welded to the bottom wall of the lower box 150, and the cold plate assembly 110 is crimped to the reinforcing ribs 160. The reinforcing ribs 160 are used to support the cold plate assembly 110 to enhance the strength of the battery pack 100.

[0042] Furthermore, the cross section of the reinforcing rib 160 is in the shape of a Chinese character "X", and a heat-insulating cavity is formed between the middle of the reinforcing rib 160 and the bottom wall of the lower box body 150, and a heat-insulating pad 170 is provided between the reinforcing rib 160 and the cold plate assembly 110. It can be understood that the heat-insulating pad 170 and the heat-insulating cavity can both insulate the cold plate assembly 110, thereby improving the heat preservation performance of the battery pack 100.

[0043] Optionally, a portion of the reinforcing ribs 160 extends along the thickness direction of the battery cell 121 and is arranged along the length direction of the battery cell 121 corresponding to the middle part of the battery cell 121; another portion of the reinforcing ribs 160 extends along the length direction of the battery cell 121, and multiple reinforcing ribs 160 are crisscrossed and welded together.

[0044] like Figure 1As shown, two cross beams 151 are provided in the lower box 150, and the two cross beams 151 are provided on both sides of the cold plate assembly 110 along the thickness direction of the battery cell 121, and a PC sheet is attached between the cross beams 151 and the cold plate assembly 110, and the PC sheet is used to isolate the cold plate assembly 110 from transferring heat to the cross beams 151. The battery pack 100 also includes an upper cover 180, which is provided on top of the lower box 150.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: The battery pack comprises a cold plate assembly (110) and a plurality of battery cell groups (120), each of the battery cell groups (120) comprising a plurality of battery cells (121) arranged along a length direction, the cold plate assembly (110) having a plurality of assembly spaces (111), and each of the assembly spaces (111) being used to accommodate a corresponding battery cell group (120), and making the battery cells (121) adhere to the cold plate assembly (110) on two side surfaces along a thickness direction and a bottom surface along a height direction, and the cold plate assembly (110) having a plurality of flow channels (112), and each of the flow channels (112) is reciprocated at two ends of the cold plate assembly (110) along a length direction of the battery cells (121); The coolant can flow along the flow channel (112) and cool the two side surfaces of the battery core (121) along the thickness direction and the bottom surface of the battery core (121) along the height direction.

2. The battery pack according to claim 1, characterized in that: The cold plate assembly (110) comprises an end plate (113) and a plurality of liquid cooling plates (114); the cross section of the liquid cooling plate (114) is L-shaped; the plurality of liquid cooling plates (114) are arranged toward the end plate (113) and are arranged along the thickness direction of the battery cell (121), so that the assembly space (111) is formed between two adjacent liquid cooling plates (114) or between the liquid cooling plate (114) and the end plate (113).

3. The battery pack according to claim 2, characterized in that: The battery pack further comprises a liquid inlet manifold (130) and a liquid outlet manifold (140); a first channel (113a) is provided in the end plate (113); a liquid inlet end of the first channel (113a) is connected to the liquid inlet manifold (130), and a liquid outlet end of the first channel (113a) is connected to the liquid outlet manifold (140); Each of the liquid cooling plates (114) is provided with a flow channel (112), and a liquid inlet (112a) of the flow channel (112) is connected to the liquid inlet manifold (130), and a liquid outlet (112b) of the flow channel (112) is connected to the liquid outlet manifold (140).

4. The battery pack according to claim 3, characterized in that: Each of the liquid cooling plates (114) comprises a main body (115) and a liquid inlet collector (116) and a liquid outlet collector (117) connected to two ends of the main body (115) along the length direction of the battery cell (121); the liquid inlet (112a) is provided on the liquid inlet collector (116); the liquid outlet (112b) is provided on the liquid outlet collector (117); the main body (115) has n second channels (115a) parallel to each other; the liquid inlet collector (116) and the liquid outlet collector (117) are provided with communication cavities (116a) corresponding to the second channels (115a); the number of the communication cavities (116a) is configured to be n-1; Wherein, n second channels (115a) are connected end to end in sequence through n-1 connecting cavities (116a) to form the flow channel (112), and n≥3.

5. The battery pack according to claim 4, characterized in that: The main body (115) comprises a bottom plate (114a) and a side plate (114b) connected to each other, the bottom plate (114a) being attached to the bottom surface of the battery core (121) along the height direction, and the side plate (114b) being attached to the side surface of the battery core (121) along the thickness direction; The number of the second channels (115a) is configured to be three, one of the second channels (115a) is opened on the bottom plate (114a), and the other two of the second channels (115a) are opened on the side plate (114b).

6. The battery pack according to claim 4, characterized in that: A plurality of partitions (115b) are provided in the first channel (113a) and / or the second channel (115a), and the plurality of partitions (115b) separate the first channel (113a) and / or the second channel (115a) into a plurality of sub-channels (115c) parallel to each other.

7. The battery pack according to claim 3, characterized in that: Along the height direction of the battery core (121), the liquid inlet (112a) is located below the liquid outlet (112b).

8. The battery pack according to claim 3, characterized in that: The liquid inlet manifold (130) and / or the liquid outlet manifold (140) comprises a primary tube (131) and a plurality of secondary tubes (132); the primary tube (131) is provided with a plurality of flow diversion points (131a) distributed at intervals, each of the flow diversion points (131a) correspondingly connected to one of the secondary tubes (132); and the secondary tube (132) is provided with a plurality of flow diversion tubes (133), each of the flow diversion tubes (133) correspondingly connected to one of the liquid cooling plates (114) or connected to the end plate (113).

9. The battery pack according to claim 1, characterized in that: The battery pack further comprises a lower box body (150) and a plurality of reinforcing ribs (160), wherein the reinforcing ribs (160) are welded to the bottom wall of the lower box body (150), and the cold plate assembly (110) is crimped to the reinforcing ribs (160).

10. The battery pack according to claim 9, characterized in that: The cross section of the reinforcing rib (160) is in the shape of a cross, and a heat-insulating cavity is formed between the middle of the reinforcing rib (160) and the bottom wall of the lower box (150), and a heat-insulating pad (170) is provided between the reinforcing rib (160) and the cold plate assembly (110).

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