Battery pack

Abstract

The invention provides a battery pack, and relates to the technical field of batteries. The battery module comprises current guide strips and a plurality of battery cells, the plurality of battery cells are stacked and arranged along a first direction, two current guide strips are arranged between any two adjacent battery cells, the current guide strips extend along a second direction, and the two current guide strips are arranged at intervals along a third direction; a first cooling channel is defined by any two adjacent battery cells and the flow guide strip between the two adjacent battery cells, and the first direction, the second direction and the third direction are perpendicular to each other; the lower box body comprises a bottom plate, at least two supporting strips are arranged on the bottom plate, the battery module is arranged on the at least two supporting strips, a pole column included by the battery cell faces the bottom plate, and a second cooling channel is defined between the battery module and the bottom plate; a liquid inlet pipe and a liquid outlet pipe are arranged on the lower box body, the first cooling channel is communicated with the liquid inlet pipe and the liquid outlet pipe, and the second cooling channel is communicated with the liquid inlet pipe and the liquid outlet pipe. The battery pack provided by the invention can meet the cooling requirement when the battery pack is quickly charged.

Description

Technical Field

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

[0002] With the development of power battery technology, new energy vehicles that use battery packs composed of cells as power sources have been increasingly widely used, and the demand for fast charging of battery packs has also been increasing. Liquid cooling plates are difficult to meet the cooling needs of battery packs that charge faster than 4C, and battery packs that use immersion cooling have begun to appear.

[0003] However, existing battery packs using immersion cooling are generally cooled directly through coolant in the battery pack box, and the contact area between the battery cells and the coolant is small, so the cooling effect on the battery cells is relatively poor. Summary of the invention

[0004] In view of this, the present application provides a battery pack to solve the problem that the contact area between the battery cells and the coolant in the existing battery pack is small, resulting in relatively poor cooling effect on the battery cells.

[0005] The present invention provides a battery pack, the battery pack comprising a lower box, a battery module and a support bar, the battery module comprising a guide bar and a plurality of battery cells, the plurality of battery cells are stacked and arranged along a first direction, two guide bars are arranged between any two adjacent battery cells, the guide bars extend along a second direction, the two guide bars are arranged at intervals along a third direction, any two adjacent battery cells and the guide bars between the two adjacent battery cells enclose a first cooling channel, and the first direction, the second direction and the third direction are perpendicular to each other;

[0006] The lower box body comprises a bottom plate, at least two support bars are arranged on the bottom plate, the battery module is arranged on the at least two support bars, the poles included in the battery core face the bottom plate, and a second cooling channel is enclosed between the battery module and the bottom plate;

[0007] The lower box body is provided with a liquid inlet pipe and a liquid outlet pipe, the first cooling channel is communicated with the liquid inlet pipe and the liquid outlet pipe respectively, and the second cooling channel is communicated with the liquid inlet pipe and the liquid outlet pipe respectively.

[0008] Preferably, the lower box body further comprises a frame, the frame is arranged around the bottom plate, the frame encloses a liquid inlet channel, the liquid inlet channel is connected to the liquid inlet pipe, and the first cooling channel and the second cooling channel are both connected to the liquid inlet channel.

[0009] Preferably, the frame comprises a first frame, a second frame and two third frames, the first frame and the second frame are arranged at intervals along the first direction, the two third frames are arranged at intervals along the third direction, and the first frame, one third frame, the second frame and another third frame are connected end to end in sequence;

[0010] The liquid inlet channel includes a first liquid inlet section and a second liquid inlet section that are connected to each other; the first frame encloses the first liquid inlet section, the third frame encloses the second liquid inlet section, and the third frame is provided with a first connecting hole that is connected to the second liquid inlet section, and the first connecting hole is connected to the first cooling channel.

[0011] Preferably, a second communication hole communicating with the second liquid inlet section is formed on a side of the first frame facing the battery module, and the second communication hole is communicated with the second cooling channel.

[0012] Preferably, the lower box body further comprises a support beam, the support beam extends along the first direction, two ends of the support beam are respectively connected to the first frame and the second frame, and the battery module is arranged on one side of the support beam in the third direction;

[0013] The support beam is surrounded by a liquid outlet channel connected to the liquid outlet pipe, a third connecting hole connected to the liquid outlet channel is opened on the support beam, and the first cooling channel and the second cooling channel are connected to the third connecting hole.

[0014] Preferably, a connecting channel is arranged between one end of the battery module in the first direction and the second frame, and the connecting channel is communicated with the second cooling channel and the liquid outlet channel respectively.

[0015] Preferably, the battery pack includes a plurality of battery modules, and the battery modules are divided into two groups. The two groups of battery modules are respectively arranged on both sides of the support beam in the third direction, and the first cooling channel enclosed by the battery modules in each group is connected to the liquid inlet channel enclosed by the adjacent third frame.

[0016] Preferably, the first frame includes a frame portion and a channel portion, the channel portion is connected to the side of the frame portion facing the battery module, the channel portion encloses the liquid inlet channel, the liquid inlet pipe passes through the frame portion and is connected to the channel portion, and the liquid outlet pipe passes through the frame portion and is connected to the support beam.

[0017] Preferably, the channel portion is provided with the second communicating hole, and an end portion of the channel portion is connected to the third frame.

[0018] Preferably, the battery pack also includes a connecting piece, which includes a first surface and a second surface opposite to each other in the third direction, the first surface is in contact with the third frame, the second surface is in contact with the battery module, and the connecting piece is provided with a connecting hole passing through the connecting piece, and the first cooling channel is connected to the second liquid inlet section through the connecting hole.

[0019] Preferably, the first frame includes two channel portions, the two channel portions are respectively located on both sides of the support beam, and are respectively connected to the two third frames;

[0020] There are two liquid inlet pipes, and the two liquid inlet pipes are connected to the two channel parts respectively.

[0021] Preferably, the battery modules in a group are arranged along the third direction;

[0022] For two adjacent battery modules in a group of battery modules, the battery cells in the two battery modules correspond one to one; the first cooling channel between two adjacent battery cells in one battery module is connected to the first cooling channel between two corresponding adjacent battery cells in another battery module;

[0023] The first cooling channel enclosed by the battery module near the third frame is communicated with the liquid inlet channel, and the first cooling channel enclosed by the battery module near the support beam is communicated with the liquid outlet channel.

[0024] Preferably, a plurality of third connecting holes are provided on the support beam, and the plurality of third connecting holes are divided into two groups. The two groups of third connecting holes are respectively located on both sides of the support beam in the first direction, and the third connecting holes in each group are spaced apart along the third direction.

[0025] Preferably, the battery cell includes a first explosion-proof valve, and the second frame is provided with a second explosion-proof valve;

[0026] The lower box body also includes an exhaust component, which is fixed on the frame. The exhaust component surrounds a first exhaust channel. The first explosion-proof valve is in contact with the exhaust component, and the first exhaust channel extends to the second explosion-proof valve.

[0027] Preferably, the second frame encloses a second exhaust channel, the exhaust member is connected to the second frame so that the first exhaust channel is connected to the second exhaust channel, and the second explosion-proof valve is arranged on the frame.

[0028] In the battery pack of the present application, the battery module includes a guide bar and a plurality of battery cells, the plurality of battery cells are stacked and arranged along a first direction, two guide bars are arranged between any two adjacent battery cells, the guide bars extend along a second direction, and the two guide bars are arranged at intervals along a third direction, and any two adjacent battery cells and the guide bars between two adjacent battery cells enclose a first cooling channel, and the first cooling channel is connected to a liquid inlet pipe and a liquid outlet pipe, respectively. In this way, the coolant can enter the first cooling channel through the liquid inlet pipe, which enables the surface of the battery cell located in the first direction to contact the coolant, and the coolant flows out through the liquid outlet pipe after heat exchange with the battery cell, thereby realizing battery cell cooling. At least two support bars are arranged on the bottom plate, the battery module is arranged on the at least two support bars, the poles included in the battery cell face the bottom plate, a second cooling channel is arranged between the battery module and the bottom plate, and the second cooling channel is connected to the liquid inlet pipe and the liquid outlet pipe respectively, so that the surface where the poles of the battery cell are located can be in contact with the coolant, and the coolant flows out through the liquid outlet pipe after heat exchange with the battery cell, thereby realizing the cooling of the surface where the poles of the battery cell are located. In this way, the contact area between the battery cell and the coolant is increased, which improves the cooling effect on the battery cell, thereby meeting the cooling requirements of the battery pack during fast charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 An exploded view of a battery pack according to an embodiment of the present invention is shown;

[0031] Figure 2 Another exploded view of a battery pack showing an embodiment of the present invention;

[0032] Figure 3 A structural schematic diagram showing a perspective of the lower box;

[0033] Figure 4 A structural schematic diagram showing another perspective of the lower box;

[0034] Figure 5 A cross-sectional view of the lower box is shown;

[0035] Figure 6 A diagram showing the relative positions of the lower box and the battery module;

[0036] Figure 7 Show Figure 6 A magnified view of part A;

[0037] Figure 8A cross-sectional view of a battery pack is shown;

[0038] Fig. 9 Show Figure 8 A magnified view of part B;

[0039] Fig.10 Another cross-sectional view of the battery pack is shown;

[0040] Fig.11 Show Fig.10 Enlarged view of part C;

[0041] Fig.12 A schematic diagram showing the flow direction of the coolant for cooling the battery cell;

[0042] Fig.13 A schematic diagram showing the flow direction of the coolant for cooling the pole;

[0043] Fig.14 A schematic diagram showing the gas flow when thermal runaway occurs.

[0044] Icons: 1-lower box; 11-bottom plate; 12-first frame; 121-frame part; 122-channel part; 123-second connecting hole; 13-second frame; 14-third frame; 141-first connecting hole; 15-support beam; 151-third connecting hole; 2-battery module; 21-battery cell; 211-first explosion-proof valve; 212-pole; 22-guide bar; 3-support bar; 41-liquid inlet pipe; 42-liquid outlet pipe; 51-first cooling channel; 52-second cooling channel; 53-liquid inlet channel; 531-first liquid inlet section; 532-second liquid inlet section; 54-liquid outlet channel; 55-connecting channel; 6-connecting piece; 61-connecting hole; 71-first exhaust channel; 72-second exhaust channel; 81-upper cover; 82-second explosion-proof valve; 83-exhaust piece; L1-first direction; L2-second direction; L3-third direction. DETAILED DESCRIPTION

[0045] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0046] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0047] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0048] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0049] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0050] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0051] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0052] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0053] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0054] The following will be combined Figures 1 to 14 The battery pack of the present application is described in Figures 1 to 14 In the embodiment, the first direction L1 is parallel to the thickness direction of the battery cell 21, the second direction L2 is parallel to the width direction of the battery cell 21, and the third direction L3 is parallel to the length direction of the battery cell 21. The first direction L1, the second direction L2 and the third direction L3 are perpendicular to each other.

[0055] like Figures 1 to 14 As shown, the battery pack includes a lower box 1, a battery module 2 and a support bar 3. The battery module 2 includes a guide bar 22 and a plurality of battery cells 21. The plurality of battery cells 21 are stacked and arranged along a first direction L1. Two guide bars 22 are arranged between any two adjacent battery cells 21. The guide bars 22 extend along a second direction L2. The two guide bars 22 are arranged at intervals along a third direction L3. Any two adjacent battery cells 21 and the guide bars 22 between two adjacent battery cells 21 enclose a first cooling channel 51. The lower box body 1 includes a bottom plate 11, on which at least two support bars 3 are arranged, and the battery module 2 is arranged on the at least two support bars 3. The pole 212 included in the battery cell 21 faces the bottom plate 11, and a second cooling channel 52 is surrounded between the battery module 2 and the bottom plate 11; a liquid inlet pipe 41 and a liquid outlet pipe 42 are arranged on the lower box body 1, and the first cooling channel 51 is respectively connected to the liquid inlet pipe 41 and the liquid outlet pipe 42, and the second cooling channel 52 is respectively connected to the liquid inlet pipe 41 and the liquid outlet pipe 42.

[0056] In the battery pack of the present application, the coolant can enter the first cooling channel 51 and the second cooling channel 52 through the liquid inlet pipe 41 and then flow out through the liquid outlet pipe 42. When the coolant flows through the first cooling channel 51, the surface of the battery cell 21 located in the first direction L1 can contact with the coolant, and the coolant flows out through the liquid outlet pipe 42 after heat exchange with the battery cell 21, thereby cooling the battery cell 21. When the coolant flows through the second cooling channel 52, the surface of the pole 212 of the battery cell 21 can contact with the coolant, and the coolant flows out through the liquid outlet pipe 42 after heat exchange with the battery cell 21, thereby cooling the surface of the pole 212 of the battery cell 21. In this way, the area of ​​contact between the battery cell 21 and the coolant is increased, which improves the cooling effect on the battery cell 21, thereby meeting the cooling requirements of the battery pack during fast charging.

[0057] In addition, if Figure 8 and Fig. 9 As shown, two surfaces of the battery core 21 located in the first direction L1 are in contact with the coolant in the two first cooling channels 51 respectively, thereby improving the cooling effect on the battery core 21 .

[0058] In an embodiment of the present application, the lower box body 1 also includes a frame (including a first frame 12, a second frame 13 and two third frames 14), and the frame is arranged around the bottom plate 11 to form a space for accommodating the battery module 2. The battery pack also includes an upper cover 81, and the upper cover 81 is covered on the lower box body 1, thereby enclosing the battery module 2 in the lower box body 1.

[0059] Furthermore, the frame is provided with a liquid inlet channel 53, the liquid inlet channel 53 is communicated with the liquid inlet pipe 41, and the first cooling channel 51 and the second cooling channel 52 are both communicated with the liquid inlet channel 53. In this way, the coolant can enter the first cooling channel 51 and the second cooling channel 52 through the liquid inlet pipe 41 and the liquid inlet channel 53, and the coolant enters the first cooling channel 51 and the second cooling channel 52 through the liquid inlet channel 53 provided by the frame, without the need to set up additional pipelines, thereby improving the space utilization rate inside the lower box 1.

[0060] like Figure 3 , 4As shown in Figure 5, the frame includes a first frame 12, a second frame 13 and two third frames 14. The first frame 12 and the second frame 13 are arranged at intervals along the first direction L1, and the two third frames 14 are arranged at intervals along the third direction L3. The first frame 12, one third frame 14, the second frame 13 and another third frame 14 are connected end to end in sequence, so that the frame is rectangular. The first cooling channel 51 includes a first liquid inlet section 531 and a second liquid inlet section 532. The first frame 12 encloses the first liquid inlet section 531, and the third frame 14 encloses the second liquid inlet section 532. The third frame 14 is provided with a first connecting hole 141 connected to the first liquid inlet section 531. The first connecting hole 141 is connected to the first cooling channel 51, so that the coolant can enter the first cooling channel 51 through the first liquid inlet section 531, the first liquid inlet section 531 and the first connecting hole 141.

[0061] Optionally, the liquid inlet pipe 41 is disposed on the outer side wall of the first frame 12 , so that the liquid inlet pipe 41 can be connected to the first liquid inlet section 531 .

[0062] like Figure 4 and Figure 5 As shown, the first frame 12 includes a frame portion 121 and a channel portion 122. The channel portion 122 is connected to the side of the frame portion 121 facing the battery module 2. The channel portion 122 encloses a first liquid inlet section 531. The liquid inlet pipe 41 passes through the frame portion 121 and is connected to the channel portion 122. The liquid outlet pipe 42 passes through the frame portion 121 and is connected to the support beam 15, thereby realizing the connection between the liquid inlet pipe 41 and the liquid inlet channel 53 and the liquid outlet pipe 42 and the liquid outlet channel 54.

[0063] Furthermore, a second connecting hole 123 connected to the first liquid inlet section 531 is provided on one side of the channel portion 122 facing the battery module 2, and the second connecting hole 123 is connected to the second cooling channel 52, so that the coolant entering the first liquid inlet section 531 can enter the second cooling channel 52 through the second connecting hole 123. The end of the channel portion 122 is connected to the third frame 14, so that the first liquid inlet section 531 is connected to the second liquid inlet section 532. The number of the second connecting holes 123 can be multiple, and the multiple second connecting holes 123 are arranged at intervals along the third direction L3.

[0064] like Figure 3 , 4As shown in Figure 5, the lower box body 1 also includes a support beam 15, which extends along the first direction L1, and the two ends of the support beam 15 are respectively connected to the first frame 12 and the second frame 13, and the battery module 2 is arranged on one side of the support beam 15 in the third direction L3; the support beam 15 surrounds a liquid outlet channel 54 connected to the liquid outlet pipe 42, and a third connecting hole 151 connected to the liquid outlet channel 54 is opened on the support beam 15, and the first cooling channel 51 and the second cooling channel 52 are both connected to the third connecting hole 151. In this way, the coolant flowing out of the first cooling channel 51 and the second cooling channel 52 flows out through the third connecting hole 151, the liquid outlet channel 54 and the liquid outlet pipe 42. The liquid outlet pipe 42 can be arranged on the outer side wall of the first frame 12, which can facilitate the connection between the liquid outlet pipe 42 and the frame portion 121 passing through the first frame 12 and the support beam 15, so that the liquid outlet channel 54 is connected to the liquid outlet pipe 42.

[0065] Optionally, the number of liquid inlet pipes 41 can be two, the number of channel portions 122 can be two, the two channel portions 122 are respectively located on both sides of the support beam 15, the two channel portions 122 respectively enclose a first liquid inlet section 531, the two first liquid inlet sections 531 are respectively connected to the two liquid inlet pipes 41, and the two second liquid inlet sections 532 are respectively connected to the two first liquid inlet sections 531, so that the two second liquid inlet sections 532 are respectively connected to the two liquid inlet pipes 41.

[0066] In the embodiments of the present application, Figure 6 As shown, the battery pack includes a plurality of battery modules 2, and the battery modules 2 are divided into two groups. The two groups of battery modules 2 are respectively arranged on both sides of the support beam 15 in the third direction L3, and the first cooling channel 51 enclosed by the battery modules 2 in each group is connected to the liquid inlet channel 53 enclosed by the adjacent third frame 14, so that the battery modules 2 located on both sides of the support beam 15 can be cooled.

[0067] Optionally, the number of battery packs may be 2, 4, 6 or more.

[0068] Further, the battery modules 2 in a group are arranged along the third direction L3, and for two adjacent battery modules 2 in a group of battery modules 2, the battery cells 21 in the two battery modules 2 correspond one to one; the first cooling channel 51 between two adjacent battery cells 21 in one battery module 2 is connected to the first cooling channel 51 between two corresponding adjacent battery cells 21 in another battery module 2, the first cooling channel 51 enclosed by the battery module 2 close to the third frame 14 is connected to the liquid inlet channel 53, and the first cooling channel 51 enclosed by the battery module 2 close to the support beam 15 is connected to the liquid outlet channel 54, thereby realizing the connection between the first cooling channels 51 in multiple battery modules 2 and the liquid outlet channel 54 and the liquid inlet channel 53. The number of the first connecting holes 141 opened on the third frame 14 is greater than or equal to the number of the first cooling channels 51, so that each first cooling channel 51 is correspondingly provided with a first connecting hole 141, and the coolant flowing out of the first cooling channel 51 can enter the corresponding first cooling channel 51 through the first connecting hole 141.

[0069] In addition, if Figure 1 and Figure 5 As shown, the battery pack further includes a connector 6, the connector 6 includes a first surface and a second surface opposite to each other in the third direction L3, the first surface is in contact with the third frame 14, the second surface is in contact with the battery module 2, the connector 6 is provided with a connector hole 61 penetrating the connector 6 along the third direction L3, and the first cooling channel 51 is connected with the second liquid inlet section 532 through the connector hole 61. The number of the connector holes 61, the first connecting holes 141, and the first cooling channels 51 included in the battery module 2 is the same, the number of the connectors 6 is two, and the two connectors 6 are respectively in contact with the two third frames 14.

[0070] like Figure 3 and Figure 4 As shown, a plurality of third connecting holes 151 are provided on the support beam 15, and the plurality of third connecting holes 151 are divided into two groups. The two groups of third connecting holes 151 are respectively located on both sides of the support beam 15 in the first direction L1, and the third connecting holes 151 in each group are spaced apart along the third direction L3, so that the first cooling channel 51 enclosed by the battery modules 2 on both sides and the second cooling channel 52 formed between the battery module 2 and the bottom plate 11 can be connected with the liquid outlet channel 54 through the third connecting holes 151, thereby realizing the circulation of the cooling liquid.

[0071] like Figure 7As shown, a connecting channel 55 is arranged between one end of the battery module 2 in the first direction L1 and the second frame 13, and the connecting channel 55 is respectively connected to the second cooling channel 52 and the liquid outlet channel 54, so that the second cooling channel 52 can be connected to the liquid outlet channel 54. Optionally, the number of third connecting holes 151 in each group can be one more than the number of first cooling channels 51, and the position of the third connecting hole 151 close to the second frame 13 can correspond to the connecting channel 55, and the other third connecting holes 151 correspond one-to-one to the first cooling channels 51 in the battery module 2.

[0072] In the embodiments of the present application, Figure 4 , Fig.10 and Fig.11 As shown, the battery cell 21 includes a first explosion-proof valve 211, and a second explosion-proof valve 82 is provided on the second frame 13; the lower box 1 also includes an exhaust member 83, which can extend along the first direction L1, and the exhaust member 83 is fixed on the frame, and the exhaust member 83 surrounds a first exhaust channel 71, and the first explosion-proof valve 211 is fitted with the exhaust member 83, and the first exhaust channel 71 extends to the second explosion-proof valve 82. When thermal runaway occurs in one of them, under the impact of the gas, the first explosion-proof valve 211 sprays through the exhaust member 83, so that the gas is discharged to the second explosion-proof valve 82 through the first exhaust channel 71, and the second explosion-proof valve 82 opens, and the gas is discharged.

[0073] Further, the second frame 13 is provided with a second exhaust channel 72, and the second explosion-proof valve 82 is provided on the second frame 13. The exhaust member 83 is connected to the second frame 13 so that the first exhaust channel 71 is connected to the second exhaust channel 72. In this way, the gas can flow to the second explosion-proof valve 82 through the first exhaust channel 71 and the second exhaust channel 72. When thermal runaway occurs, the gas can flow to the second explosion-proof valve 82 through the first exhaust channel 71 and the second exhaust channel 72, so that the second explosion-proof valve 82 is opened to facilitate gas discharge. In addition, the first explosion-proof valve 211 is fitted with the exhaust member 83, so that the first explosion-proof valve 211 does not contact the coolant, which can effectively solve the sealing problem of the first explosion-proof valve 211.

[0074] Optionally, the number of exhaust pieces 83 is the same as the number of battery modules 2 , that is, each battery module 2 is correspondingly provided with a corresponding exhaust piece 83 , and the first explosion-proof valve 211 of any battery cell 21 can fit with the exhaust piece 83 .

[0075] In addition, a second cooling channel 52 is arranged between each battery module 2 and the bottom plate 11 . The second cooling channel 52 is divided into two parts by the exhaust member 83 , so that each second cooling channel 52 needs to be provided with two corresponding second connecting holes 123 .

[0076] Take a group including two battery modules 2 as an example, that is, the battery pack includes four battery modules 2, and two battery modules 2 are arranged on both sides of the support beam 15. The following description is made with reference to the two battery modules 2 in one group. The number of battery cells 21 in the two battery modules 2 is the same, so that the battery cells 21 in the two battery modules 2 correspond one to one, the multiple first cooling channels 51 formed in one battery module 2 correspond one to one with the multiple first cooling channels 51 formed in the other battery module 2, the first cooling channel 51 in one battery module 2 is connected with the corresponding first cooling channel 51, the first cooling channel 51 in the battery module 2 near the support beam 15 is connected with the liquid outlet channel 54 through the corresponding third connecting hole 151, and the first cooling channel 51 in the battery module 2 near the third frame 14 is connected with the liquid inlet channel 53 through the corresponding connecting hole 61 and the first connecting hole 141. The two battery modules 2 can be provided with three supporting members in total, and the three supporting members are arranged at intervals along the third direction L3, and the adjacent two ends of the two battery modules 2 are supported by the same supporting member. In addition, the guide bar 22 between two adjacent battery cells 21 in one battery module 2 and the guide bar 22 corresponding to the position of the guide bar 22 between two corresponding adjacent battery cells 21 in another battery module 2 may be integrally formed.

[0077] When the battery pack of the present application is running, under conditions such as fast charging and intense driving, the battery cell 21 and the pole 212 generate large amounts of heat, and the battery cell 21 and the pole 212 need to be cooled. In this mode, the battery cell 21 and the pole 212 need to be cooled separately. Fig.12 As shown, the coolant for cooling the battery cell 21 flows sequentially through the liquid inlet pipe 41, the first liquid inlet section 531, the second liquid inlet section 532, the first cooling channel 51, the liquid outlet channel 54 and the liquid outlet pipe 42. Fig.13 As shown, the coolant for cooling the battery core 21 flows sequentially through the liquid inlet pipe 41 , the first liquid inlet section 531 , the second cooling channel 52 , the connecting channel 55 , the liquid outlet channel 54 and the liquid outlet pipe 42 .

[0078] In the event of thermal runaway, Fig.14 As shown, under the impact of the gas, the first explosion-proof valve 211 sprays through the exhaust member 83, and the gas can flow to the second explosion-proof valve 82 through the first exhaust channel 71 and the second exhaust channel 72, so that the second explosion-proof valve 82 opens, thereby allowing the gas to be discharged from the battery pack.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that: The battery pack comprises a lower box, a battery module and a support bar, the battery module comprises a guide bar and a plurality of battery cells, the plurality of battery cells are stacked and arranged along a first direction, two guide bars are arranged between any two adjacent battery cells, the guide bars extend along a second direction, the two guide bars are arranged at intervals along a third direction, any two adjacent battery cells and the guide bars between the two adjacent battery cells enclose a first cooling channel, and the first direction, the second direction and the third direction are perpendicular to each other; The lower box body comprises a bottom plate, at least two support bars are arranged on the bottom plate, the battery module is arranged on the at least two support bars, the poles included in the battery core face the bottom plate, and a second cooling channel is enclosed between the battery module and the bottom plate; The lower box body is provided with a liquid inlet pipe and a liquid outlet pipe, the first cooling channel is communicated with the liquid inlet pipe and the liquid outlet pipe respectively, and the second cooling channel is communicated with the liquid inlet pipe and the liquid outlet pipe respectively.

2. The battery pack according to claim 1, characterized in that: The lower box body also includes a frame, which is arranged around the bottom plate. The frame encloses a liquid inlet channel, the liquid inlet channel is connected to the liquid inlet pipe, and the first cooling channel and the second cooling channel are both connected to the liquid inlet channel.

3. The battery pack according to claim 2, characterized in that: The frame comprises a first frame, a second frame and two third frames, the first frame and the second frame are arranged at intervals along the first direction, the two third frames are arranged at intervals along the third direction, and the first frame, one third frame, the second frame and another third frame are connected end to end in sequence; The liquid inlet channel includes a first liquid inlet section and a second liquid inlet section that are connected to each other; the first frame encloses the first liquid inlet section, the third frame encloses the second liquid inlet section, and the third frame is provided with a first connecting hole that is connected to the second liquid inlet section, and the first connecting hole is connected to the first cooling channel.

4. The battery pack according to claim 3, characterized in that: A second communication hole communicating with the second liquid inlet section is formed on a side of the first frame facing the battery module, and the second communication hole is communicated with the second cooling channel.

5. The battery pack according to claim 4, characterized in that: The lower box body further includes a support beam, the support beam extends along the first direction, two ends of the support beam are respectively connected to the first frame and the second frame, and the battery module is arranged on one side of the support beam in the third direction; The support beam is surrounded by a liquid outlet channel connected to the liquid outlet pipe, a third connecting hole connected to the liquid outlet channel is opened on the support beam, and the first cooling channel and the second cooling channel are connected to the third connecting hole.

6. The battery pack according to claim 5, characterized in that: A connecting channel is arranged between one end of the battery module in the first direction and the second frame, and the connecting channel is communicated with the second cooling channel and the liquid outlet channel respectively.

7. The battery pack according to claim 5, characterized in that: The battery pack includes a plurality of battery modules, and the battery modules are divided into two groups. The two groups of battery modules are respectively arranged on both sides of the support beam in the third direction, and the first cooling channel enclosed by the battery modules in each group is connected to the liquid inlet channel enclosed by the adjacent third frame.

8. The battery pack according to claim 5, characterized in that: The first frame includes a frame portion and a channel portion, the channel portion is connected to a side of the frame portion facing the battery module, the channel portion encloses the liquid inlet channel, the liquid inlet pipe passes through the frame portion and is connected to the channel portion, and the liquid outlet pipe passes through the frame portion and is connected to the support beam.

9. The battery pack according to claim 8, characterized in that: The channel portion is provided with the second communicating hole, and an end of the channel portion is connected to the third frame.

10. The battery pack according to claim 3, characterized in that: The battery pack also includes a connector, which includes a first surface and a second surface opposite to each other in the third direction, the first surface is in contact with the third frame, the second surface is in contact with the battery module, and the connector is provided with a connector hole that passes through the connector, and the first cooling channel is connected to the second liquid inlet section through the connector hole.

11. The battery pack according to claim 9, characterized in that: The first frame includes two channel portions, which are respectively located on both sides of the support beam and are respectively connected to the two third frames; There are two liquid inlet pipes, and the two liquid inlet pipes are connected to the two channel parts respectively.

12. The battery pack according to claim 7, characterized in that: The battery modules in one group are arranged along the third direction; For two adjacent battery modules in a group of battery modules, the battery cells in the two battery modules correspond one to one; the first cooling channel between two adjacent battery cells in one battery module is connected to the first cooling channel between two corresponding adjacent battery cells in another battery module; The first cooling channel enclosed by the battery module near the third frame is communicated with the liquid inlet channel, and the first cooling channel enclosed by the battery module near the support beam is communicated with the liquid outlet channel.

13. The battery pack according to claim 5, characterized in that: The support beam is provided with a plurality of third connecting holes, which are divided into two groups. The two groups of third connecting holes are respectively located on both sides of the support beam in the first direction, and the third connecting holes in each group are spaced apart along the third direction.

14. The battery pack according to claim 3, characterized in that: The battery core includes a first explosion-proof valve, and the second frame is provided with a second explosion-proof valve; The lower box body also includes an exhaust component, which is fixed on the frame. The exhaust component surrounds a first exhaust channel. The first explosion-proof valve is in contact with the exhaust component, and the first exhaust channel extends to the second explosion-proof valve.

15. The battery pack according to claim 14, characterized in that: The second frame encloses a second exhaust passage, the exhaust member is connected to the second frame so that the first exhaust passage is connected to the second exhaust passage, and the second explosion-proof valve is arranged on the frame.

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