Battery pack

Abstract

The invention relates to a battery pack, which comprises a box body and a battery module, the battery module is connected in the box body, the battery module comprises a plurality of prism battery cells which are in fit connection along a first direction and a second direction, each prism battery cell comprises a shell and a battery cell group, and the shell is the prism battery cell and extends along a third direction; the battery cell group at least comprises two single battery cells which are connected in parallel, the single battery cells comprise a first single battery cell and a second single battery cell, the first single battery cell is provided with a first positive pole lug, the second single battery cell is provided with a first negative pole lug, the first positive pole lug forms a positive connecting end of the battery cell group, and the first negative pole lug forms a negative connecting end of the battery cell group. According to the battery pack provided by the invention, the at least two single battery cells are integrated in the prismatic shell, and the at least two single battery cells are connected in parallel, so that the capacity of the single battery cells can be improved.

Description

Technical Field

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

[0002] Currently, many battery manufacturers are using multi-core parallel connection to increase the energy capacity of battery packs. However, the battery pack has a complex structure and has structural stability issues. Summary of the invention

[0003] In view of this, an embodiment of the present application provides a battery pack to solve at least one problem existing in the background technology.

[0004] In a first aspect, an embodiment of the present application provides a battery pack, the battery pack comprising: Box; A battery module connected to the box, the battery module comprising a plurality of prismatic cells connected in a first direction and a second direction; Wherein, the prismatic cell comprises: A shell, the shell is in a prism shape and extends along a third direction, and has a first opening and a second opening at two ends of the shell respectively; A battery cell group, comprising at least two single battery cells connected in parallel, wherein the single battery cells are located in the shell, and the single battery cells include a first single battery cell and a second single battery cell, wherein the first single battery cell is arranged near the first opening, and the first single battery cell is provided with a first positive electrode tab, and the second single battery cell is arranged near the second opening, and the second single battery cell is provided with a first negative electrode tab, the first positive electrode tab of the first single battery cell constitutes a positive connection end of the battery cell group, and the first negative electrode tab of the second single battery cell constitutes a negative connection end of the battery cell group.

[0005] In combination with the first aspect of the present application, in an optional embodiment, the battery cell group further includes a third single battery cell, the third single battery cell is connected between the first single battery cell and the second single battery cell, and both ends of the third single battery cell are provided with a second positive electrode tab and a second negative electrode tab; A second positive electrode tab and a second negative electrode tab are both provided on the side of the first single cell and the second single cell facing the third single cell, the second positive electrode tab of the first single cell is connected to the second positive electrode tab of the adjacent third single cell, the second negative electrode tab of the first single cell is connected to the second negative electrode tab of the adjacent third single cell, the second positive electrode tab of the second single cell is connected to the second positive electrode tab of the adjacent third single cell, and the second negative electrode tab of the second single cell is connected to the second negative electrode tab of the adjacent third single cell.

[0006] In combination with the first aspect of the present application, in an optional embodiment, a plurality of third single cells are provided, the second positive electrode tabs of adjacent third single cells are connected to the adjacent second positive electrode tabs, and the second negative electrode tabs of adjacent third single cells are connected to the adjacent second negative electrode tabs.

[0007] In combination with the first aspect of the present application, in an optional embodiment, the first positive electrode tab, the first negative electrode tab, the second positive electrode tab and the second negative electrode tab all have a lead-out section, a transition section and a flattening section, the lead-out section, the transition section and the flattening section are connected in sequence, and the flattening section is located at the ends of the first positive electrode tab, the first negative electrode tab, the second positive electrode tab and the second negative electrode tab.

[0008] In conjunction with the first aspect of the present application, in an optional embodiment, the prismatic cell further includes a first top cover assembly and a second top cover assembly, the first top cover assembly is connected to the first opening of the housing, and the second top cover assembly is connected to the second opening of the housing; Wherein, the first top cover assembly comprises: a positive electrode top cover connected to the first opening of the housing; A first pole connected to the positive electrode top cover; A first insulating member connected between the first pole and the positive electrode top cover; A positive electrode adapter connected to the first electrode post and the first positive electrode tab; The positive electrode adapter includes a first adapter and a second adapter, the first adapter is perpendicular to the second adapter, the first adapter is attached to the first pole, and the second adapter is connected to the first positive electrode ear.

[0009] In conjunction with the first aspect of the present application, in an optional implementation manner, the prismatic cell further includes: A connecting protective member, which is sleeved on the first positive electrode tab, the first negative electrode tab, the second positive electrode tab and the second negative electrode tab; The connection protection member is provided with an avoidance groove, and the avoidance groove is used to accommodate the first positive electrode tab, the first negative electrode tab, the second positive electrode tab and the second negative electrode tab, and the end face of the connection protection member matches the end face of the single battery cell.

[0010] In combination with the first aspect of the present application, in an optional embodiment, the box body is provided with a liquid cooling channel, the outer surface of the liquid cooling channel is in contact with the outer surface of the shell, and the outer surface of the liquid cooling channel matches the shape of multiple outer surfaces of the shell.

[0011] In conjunction with the first aspect of the present application, in an optional implementation, the prismatic cell includes: a first prismatic cell, wherein a plurality of the first prismatic cells are connected in the first direction to form a first cell group, the first prismatic cells have first side surfaces facing each other in the first direction, adjacent first prismatic cells are bonded via the first side surfaces, and the first prismatic cells further have second side surfaces and third side surfaces facing each other; A second prismatic cell, a plurality of the second prismatic cells are connected in the first direction to form a second cell group, the second prismatic cells have fourth side surfaces facing each other in the first direction, adjacent second prismatic cells are bonded together through the fourth side surfaces, the second prismatic cell also has a fifth side surface and a sixth side surface facing each other, the second side surface is bonded to the fifth side surface, and the third side surface is bonded to the sixth side surface in the second direction, and the second direction is perpendicular to the first direction.

[0012] In combination with the first aspect of the present application, in an optional implementation manner, the box body includes a bottom plate, a frame and an upper cover, and the bottom plate, the frame and the upper cover are arranged to form a space for accommodating the battery module; The liquid cooling channel includes a first liquid cooling channel, the first liquid cooling channel extends along the third direction, the third direction is perpendicular to the first direction and the second direction, the bottom plate has the first liquid cooling channel, and the outer surface of the first liquid cooling channel is in contact with the fifth side surface and the sixth side surface; The liquid cooling channel includes a first liquid cooling channel, which extends along a third direction, and the third direction is perpendicular to the first direction and the second direction. The bottom plate has the first liquid cooling channel, and the outer surface of the first liquid cooling channel is in contact with the fifth side surface and the sixth side surface.

[0013] In conjunction with the first aspect of the present application, in an optional implementation, the liquid cooling channel includes: A plurality of first flow channels with openings at both ends extending along a third direction; A first blocking member connected to one end of the plurality of first flow channels, the first blocking member having a second flow channel and a water inlet, the water inlet being connected to the second flow channel; A second blocking member connected to the other end of the plurality of first flow channels, the second blocking member having a third flow channel and a water outlet, the water outlet being connected to the third flow channel; The coolant enters from the water inlet, flows through the second flow channel, the first flow channels and the third flow channel, and is discharged from the water outlet.

[0014] The battery pack provided in the embodiment of the present application integrates at least two single cells in a prismatic shell, and at least two single cells are connected in parallel, which can increase the capacity of the single cells. In addition, integrating at least two single cells in the same shell can not only greatly reduce the process complexity of the battery pack, reduce the number of connected components, but also save space and improve space utilization.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A schematic diagram of the overall structure of a battery pack provided in an embodiment of the present application; Figure 2 A schematic diagram of the structural decomposition of a prismatic cell in a battery pack provided in an embodiment of the present application; Figure 3a A schematic diagram of the connection between the first single cell, the third single cell and the second single cell in the battery pack provided in an embodiment of the present application; Figure 3b A schematic diagram of the connection between a first single cell, two third single cells and a second single cell in a battery pack provided in an embodiment of the present application; Figure 3c for Figure 3a A schematic diagram of a section of the structure at AA in the middle; Figure 4 A schematic diagram of the structural decomposition of a single cell in a battery pack provided in an embodiment of the present application; Figure 5 A schematic diagram of the structure of a first single cell and a first top cover assembly in a battery pack provided in an embodiment of the present application; Figure 6 A schematic diagram of the structure of a battery module in a battery pack provided in an embodiment of the present application; Figure 7 A schematic diagram of the three-dimensional structure of a connection protection member in a battery pack provided in an embodiment of the present application; Figure 8 A schematic diagram of a portion of the structure of a plurality of prismatic cells, an upper cover and a bottom plate in a battery pack provided in an embodiment of the present application; Fig. 9 A schematic diagram of partial structural decomposition of a base plate and a first liquid cooling channel of the base plate in a battery pack provided in an embodiment of the present application; Fig.10 for Fig. 9 Enlarged view of point C in the middle.

[0017] Reference numerals: 100, battery pack; 10, housing; 1a, liquid cooling channel; 11a, first liquid cooling channel; 12a, second liquid cooling channel; 1a1, first channel; 1a2, first blocking member; 1a21, water inlet; 1a3, second blocking member; 1a31, water outlet; 1a32, triangle plate; 1a33, third channel; 110, bottom plate; 120, frame; 130, upper cover; 20. battery module; 210. prismatic cell; 211. housing; 2111. first opening; 2112. second opening; 212. Single cell; 21a, first prismatic cell; 21a1, first side surface; 21a2, second side surface; 21a3, third side surface; 21b, second prismatic cell; 21b1, fourth side surface; 21b2, fifth side surface; 21b3, sixth side surface; 21c, positive electrode sheet; 21d, first diaphragm; 21e, negative electrode sheet; 21f, second diaphragm; 2121, first single cell; 2122, second single cell; 2123, third single cell; 212a, first positive electrode tab; 212b, first negative electrode tab; 212c, second positive electrode tab; 212d, second negative electrode tab; 212e, aluminum-plastic film; 212f, lead-out section; 212g, transition section; 212h, flattening section; 213, connecting protective member; 2131, avoidance groove; 214, first top cover assembly; 2141, positive top cover; 2142, first pole; 2143, first insulating member; 2144, positive electrode adapter; 2145, first adapter; 2146, second adapter; 215. A second top cover assembly; 216, positive electrode region; 217, negative electrode region. DETAILED DESCRIPTION

[0018] The exemplary embodiments disclosed in the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the specific embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope disclosed in the present application to those skilled in the art.

[0019] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features known in the art are not described; that is, all features of the actual embodiments are not described here, and well-known functions and structures are not described in detail.

[0020] In the drawings, the sizes of layers, regions, elements and their relative sizes may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0021] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. And when the second element, component, region, layer or part is discussed, it does not indicate that the present application necessarily has the first element, component, region, layer or part.

[0022] Spatial relationship terms such as "under", "below", "below", "under", "above", "above", etc., may be used here for convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, the spatial relationship terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, then the elements or features described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0023] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0024] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0025] like Figures 1 to 4 As shown, the embodiment of the present application provides a battery pack 100, including a box body 10 and a battery module 20, the battery module 20 is connected to the box body 10, and the battery module 20 includes a plurality of battery modules 100 along a first direction, that is, Figure 1 The arrow s1 direction and the second direction shown in Figure 1 The prismatic cell 210 is bonded and connected in the direction of arrow s2 shown in FIG.

[0026] The prismatic cell 210 includes a shell 211 and a cell group. The shell 211 is in the shape of a prism. Figure 1 The shell 211 extends in the direction of the arrow s3 shown in the figure, and the two ends of the shell 211 have a first opening 2111 and a second opening 2112 respectively. The battery cell group includes at least two single battery cells 212 connected in parallel, and the single battery cells 212 are located in the shell 211. The single battery cells 212 include a first single battery cell 2121 and a second single battery cell 2122. The first single battery cell 2121 is arranged near the first opening 2111, and the first single battery cell 2121 is provided with a first positive electrode tab 212a. The second single battery cell 2122 is arranged near the second opening 2112, and the second single battery cell 2122 is provided with a first negative electrode tab 212b. The first positive electrode tab 212a of the first single battery cell 2121 constitutes the positive connection end of the battery cell group, and the first negative electrode tab 212b of the second single battery cell 2122 constitutes the negative connection end of the battery cell group.

[0027] In the above battery pack 100, at least two single cells 212 are integrated in the prismatic shell 211, and at least two single cells 212 are connected in parallel, which can increase the capacity of the prismatic cell 210. In addition, integrating at least two single cells 212 in the same shell 211 can not only greatly reduce the process complexity of the battery pack 100 and reduce the connection parts, but also save space and improve space utilization.

[0028] Figure 2 The shell 211 is shown in the shape of a regular hexagonal prism. Of course, the shape of the shell 211 is not limited to the regular hexagonal prism. The shape of the shell 211 can also be a pentagonal prism, an octagonal prism, a decagonal prism, etc., which can be set according to specific needs and is not limited in the embodiments of the present application.

[0029] In an alternative embodiment, if Figure 3a As shown, the battery cell group further includes a third battery cell 2123 , which is connected between the first battery cell 2121 and the second battery cell 2122 , and a second positive electrode tab 212c and a second negative electrode tab 212d are disposed at both ends of the third battery cell 2123 . The first single cell 2121 and the second single cell 2122 are both provided with a second positive electrode tab 212c and a second negative electrode tab 212d on one side facing the third single cell 2123. The second positive electrode tab 212c of the first single cell 2121 is connected to the second positive electrode tab 212c of the adjacent third single cell 2123, the second negative electrode tab 212d of the first single cell 2121 is connected to the second negative electrode tab 212d of the adjacent third single cell 2123, the second positive electrode tab 212c of the second single cell 2122 is connected to the second positive electrode tab 212c of the adjacent third single cell 2123, and the second negative electrode tab 212d of the second single cell 2122 is connected to the second negative electrode tab 212d of the adjacent third single cell 2123.

[0030] Furthermore, if Figure 3b As shown, a plurality of third single cells 2123 are provided, the second positive electrode tabs 212c of adjacent third single cells 2123 are connected to the adjacent second positive electrode tabs 212c, and the second negative electrode tabs 212d of adjacent third single cells 2123 are connected to the adjacent second negative electrode tabs 212d.

[0031] like Figure 3c and Figure 4As shown, the single cell 212 is composed of a first diaphragm 21d, a positive electrode sheet 21c, a second diaphragm 21f, a negative electrode sheet 21e and an aluminum-plastic film 212e. The first diaphragm 21d, the positive electrode sheet 21c, the second diaphragm 21f and the negative electrode sheet 21e are stacked in sequence, and the starting point is wound by a winding needle. The shape of the winding needle can be cylindrical or prismatic, and the shape of the bare cell corresponds to a cylindrical or prismatic shape. The embodiment of the present application does not make specific limitations and can be selected according to needs. Figure 3c It is shown in FIG. 1 that it is wound by a cylindrical winding needle.

[0032] The single cell 212 has a positive electrode region 216 and a negative electrode region 217 symmetrically arranged about the axis of the single cell 212 . The negative electrode sheet 21e in the positive electrode region 216 is retracted into the diaphragm, and the positive electrode sheet 21c in the negative electrode region 217 is retracted into the diaphragm to ensure mutual insulation.

[0033] The second positive electrode tab 212 c and the second negative electrode tab 212 d located at the same end of the single cell 212 are symmetrically arranged relative to the axis of the single cell 212 .

[0034] The first positive electrode tab 212a and the first negative electrode tab 212b of the prismatic cell 210 are located at both ends thereof, so that conduction through the aluminum-plastic film 212e of the single cell 212 can be avoided, thereby greatly reducing the internal resistance of the prismatic cell 210 and improving the safety of the battery pack 100 during assembly.

[0035] In an alternative embodiment, if Figure 4 As shown, the first positive electrode tab 212a, the first negative electrode tab 212b, the second positive electrode tab 212c and the second negative electrode tab 212d all have a lead-out section 212f, a transition section 212g and a flattened section 212h, the lead-out section 212f, the transition section 212g and the flattened section 212h are connected in sequence, and the flattened section 212h is located at the ends of the first positive electrode tab 212a, the first negative electrode tab 212b, the second positive electrode tab 212c and the second negative electrode tab 212d.

[0036] The outer side of the bare cell is covered by an aluminum-plastic film 212e. After the bare cell is encapsulated by the aluminum-plastic film 212e, one end of the bare cell is first sealed by plastic sealing, and the electrolyte is injected from the other end, and then the other end is sealed by plastic sealing, so as to obtain a single cell 212 with a pair of positive and negative pole ears at both ends. The positive and negative pole ears are both provided with a lead-out section 212f, a transition section 212g and a flattening section 212h to facilitate the connection between the pole ears and other pole ears, and to ensure the firmness of the connection between the pole ears. The connection between the pole ears can be connected by laser welding, ultrasonic welding, riveting, crimping, etc., which is not specifically limited in the embodiments of the present application.

[0037] In an alternative embodiment, if Figure 2 and Figure 5 As shown, the prismatic cell 210 further includes a first top cover assembly 214 and a second top cover assembly 215. The first top cover assembly 214 is connected to the first opening 2111 of the housing 211, and the second top cover assembly 215 is connected to the second opening 2112 of the housing 211. The first top cover assembly 214 and the second top cover assembly 215 have the same structure, and the specific structure of the first top cover assembly 214 is described here.

[0038] Specifically, the first top cover assembly 214 includes a positive top cover 2141, a first pole 2142, a first insulating member 2143 and a positive adapter 2144. The positive top cover 2141 is connected to the first opening 2111 of the housing 211. The first pole 2142 is connected to the positive top cover 2141. The first insulating member 2143 is connected between the first pole 2142 and the positive top cover 2141. The positive adapter 2144 is connected to the first pole 2142 and the first positive pole ear 212a. The positive adapter 2144 includes a first adapter 2145 and a second adapter 2146. The first adapter 2145 is perpendicular to the second adapter 2146. The first adapter 2145 is attached to the first pole 2142. The second adapter 2146 is connected to the first positive pole ear 212a.

[0039] The second adapter plate 2146 is vertically connected to the bottom of the first adapter plate 2145, so that the positive adapter plate 2144 can have a deformation amount, that is, the first adapter plate 2145 can be bent relative to the second adapter plate 2146, so that the first top cover assembly 214 and the second top cover assembly 215 can have a certain buffer amount, further ensuring the structural stability and safety of the prismatic battery cell 210.

[0040] The positive electrode top cover 2141 and the negative electrode top cover are made by nano injection molding technology, the first pole 2142 is made of aluminum or copper, and the shell 211 is made of high-strength metal materials such as steel or aluminum, but of course it is not limited to this.

[0041] In an alternative embodiment, if Figure 2 , Figure 6 and Figure 7 As shown, the prismatic cell 210 further includes a connection protection member 213, which is sleeved on the first positive electrode tab 212a, the first negative electrode tab 212b, the second positive electrode tab 212c, and the second negative electrode tab 212d. The connection protection member 213 is provided with an escape groove 2131, which is used to accommodate the first positive electrode tab 212a, the first negative electrode tab 212b, the second positive electrode tab 212c, and the second negative electrode tab 212d, and the end face of the connection protection member 213 matches the end face of the single cell 212.

[0042] Specifically, the connecting protective member 213 is connected between the first top cover assembly 214 and the first single cell 2121, between the second top cover assembly 215 and the second single cell 2122, between the first single cell 2121 and its adjacent third single cell 2123, between the second single cell 2122 and its adjacent third single cell 2123, and between two adjacent third single cells 2123.

[0043] The end face of the connecting protective member 213 matches the end face of the single cell 212, which can greatly reduce the damage to the single cell 212 caused by external force; the connecting protective member 213 can not only protect the positive and negative ears, but also improve the structural strength of the entire prismatic cell 210.

[0044] In an alternative embodiment, if Figure 1 As shown, the box 10 is provided with a liquid cooling channel 1a, the outer surface of the liquid cooling channel 1a is in contact with the outer surface of the shell 211, and the outer surface of the liquid cooling channel 1a matches the shape of the outer surfaces of the multiple shells 211. The liquid cooling channel 1a has a contoured structure that matches the shells 211 of the multiple prismatic cells 210, which can increase the contact area between the liquid cooling channel 1a and the prismatic cells 210, thereby improving the heat dissipation capacity of the battery pack 100.

[0045] In an alternative embodiment, if Figure 1 and Figure 8 As shown, the prismatic cell Figure 1 The prismatic cell 210 extends in the direction of the arrow s3 shown in FIG. 1 , and includes a first prismatic cell 21 a and a second prismatic cell 21 b .

[0046] Among them, the plurality of first prismatic cells 21a are arranged in a first direction. Figure 1 The first prismatic cells 21a are connected in the direction of arrow s1 shown in the figure to form a first cell group. The first prismatic cells 21a have first side faces 21a1 facing each other in the first direction. Adjacent first prismatic cells 21a are bonded together through the first side faces 21a1. The first prismatic cells 21a also have second side faces 21a2 and third side faces 21a3 facing each other.

[0047] The plurality of second prismatic cells 21b are arranged in a first direction. Figure 1 The second prismatic cells 21b are connected in the direction of arrow s1 shown in the figure to form a second cell group. The second prismatic cells 21b have fourth side surfaces 21b1 facing each other in the first direction. Adjacent second prismatic cells 21b are attached via the fourth side surfaces 21b1. The second prismatic cells 21b also have fifth side surfaces 21b2 and sixth side surfaces 21b3 facing each other. Figure 1 In the direction of arrow s2 shown in FIG. 1 , the second side surface 21a2 is in contact with the fifth side surface 21b2, and the third side surface 21a3 is in contact with the sixth side surface 21b3, and the second direction is perpendicular to the first direction.

[0048] Figure 8 2 shows that the second side 21a2 and the third side 21a3 of the first prismatic cell 21a are both attached to the second liquid cooling channel 12a, and the fifth side 21b2 and the sixth side 21b3 of the second prismatic cell 21b are both attached to the first liquid cooling channel 11a. It can be understood that the liquid cooling channel 1a has a contoured structure that matches the side of the prismatic cell 210, which can increase the contact area between the liquid cooling channel 1a and the prismatic cell 210, thereby improving the heat dissipation capacity of the battery pack 100.

[0049] In addition, adjacent first prismatic cells 21a, adjacent second prismatic cells 21b, and adjacent first prismatic cells 21a and second prismatic cells 21b are all directly facing and connected, which not only facilitates the formation of multiple first cell groups and multiple second cell groups, but also can improve the structural strength of the battery module 20.

[0050] In an alternative embodiment, if Figure 1 and Figure 8 As shown, the box body 10 includes a bottom plate 110, a frame 120 and an upper cover 130. The bottom plate 110, the frame 120 and the upper cover 130 are arranged to form a receiving cavity, and the battery module 20 is located in the receiving cavity.

[0051] The liquid cooling channel 1a includes a first liquid cooling channel 11a, and the first liquid cooling channel 11a is along the third direction, that is, Figure 1 The third direction extends in the direction of arrow s3 shown in the figure, and the third direction is perpendicular to the first direction and the second direction. The bottom plate 110 has a first liquid-cooling channel 11a, and the outer surface of the first liquid-cooling channel 11a is attached to the fifth side 21b2 and the sixth side 21b3 of the second prismatic battery cell 21b.

[0052] In an optional embodiment, the liquid cooling channel 1a includes a second liquid cooling channel 12a, and the second liquid cooling channel 12a is along the third direction. Figure 1 The upper cover 130 extends in the direction of the arrow s3 shown in FIG. 1 , and has a second liquid-cooling channel 12a , and the outer surface of the second liquid-cooling channel 12a is in contact with the second side surface 21a2 and the third side surface 21a3 .

[0053] A second liquid cooling channel 12a and a first liquid cooling channel 11a are respectively provided on the upper cover 130 and the bottom plate 110, and the second liquid cooling channel 12a is fitted and connected to the first prismatic cell 21a, and the first liquid cooling channel 11a is fitted and connected to the second prismatic cell 21b, which can increase the contact area between the prismatic cell 210 and the liquid cooling channel 1a and improve the heat dissipation effect of the prismatic cell 210.

[0054] In an optional embodiment, the bottom plate 110 and the upper cover 130 are both profile structures. The bottom plate 110 and the upper cover 130 both have a channel with a rectangular cross section, which can improve the heat dissipation effect of the prismatic battery cell 210, and the profile structure has the characteristics of light weight and high strength, which improves the overall stability and safety of the prismatic battery pack 100.

[0055] In an alternative embodiment, if Figure 1 , Fig. 9 and Fig.10 As shown, the liquid cooling channel 1a includes a plurality of openings at both ends along the third direction, i.e. Fig. 9 The first flow channel 1a1, the first blocking member 1a2 and the second blocking member 1a3 extending in the direction of the arrow s3 shown in FIG. The first blocking member 1a2 is connected to one end of the plurality of first flow channels 1a1, and the first blocking member 1a2 has a second flow channel and a water inlet 1a21, and the water inlet 1a21 is connected to the second flow channel. The second blocking member 1a3 is connected to the other end of the plurality of first flow channels 1a1, and the second blocking member 1a3 has a third flow channel 1a33 and a water outlet 1a31, and the water outlet 1a31 is connected to the third flow channel 1a33.

[0056] The coolant enters the second flow channel of the first blocking member 1a2 from the water inlet 1a21 and flows along Fig. 9 The coolant flows in the direction of arrow s1 shown in FIG. 1 and flows into a plurality of first flow channels 1a1. The coolant flows in the first flow channels 1a1 along Fig. 9 The water flows in the direction of arrow s3 shown in the figure, and finally flows into the third flow channel 1a33 and is discharged from the water outlet 1a31.

[0057] In an optional embodiment, the cross section of the first flow channel 1a1 is an isosceles triangle. The first flow channel 1a1 with an isosceles triangle cross section can, on the one hand, be used to match the prismatic battery cell 210 with a hexagonal prism structure to increase the contact area between the prismatic battery cell 210 and the first flow channel 1a1; on the other hand, the first flow channel 1a1 with this structure has a strong structural strength, which can further ensure the structural stability and safety of the prismatic battery pack 100.

[0058] In an alternative embodiment, if Fig.10 As shown, the first blocking member 1a2 has the same structure as the second blocking member 1a3. A plurality of triangular plates 1a32 are provided on one side of the first blocking member 1a2 close to the first flow channel 1a1. The triangular plates 1a32 are connected between adjacent first flow channels 1a1.

[0059] The triangular plate 1a32 is used to make the first sealing member 1a2 match the opening of the first flow channel 1a1, so as to seal the first flow channel 1a1 and the second flow channel, and the first flow channel 1a1 and the third flow channel 1a33, and to improve the structural stability of the first sealing member 1a2 and the first flow channel 1a1, and the second sealing member 1a3 and the first flow channel 1a1.

[0060] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

1. A battery pack, characterized in that: include: Box; A battery module connected to the box, the battery module comprising a plurality of prismatic cells connected in a first direction and a second direction; Wherein, the prismatic cell comprises: A shell, the shell is in a prism shape and extends along a third direction, and has a first opening and a second opening at two ends of the shell respectively; A battery cell group, comprising at least two single battery cells connected in parallel, wherein the single battery cells are located in the shell, wherein the single battery cells include a first single battery cell and a second single battery cell, wherein the first single battery cell is arranged near the first opening, and the first single battery cell is provided with a first positive electrode tab, and the second single battery cell is arranged near the second opening, and the second single battery cell is provided with a first negative electrode tab, the first positive electrode tab of the first single battery cell constitutes a positive connection end of the battery cell group, and the first negative electrode tab of the second single battery cell constitutes a negative connection end of the battery cell group.

2. The battery pack according to claim 1, characterized in that: The battery cell group further includes a third single battery cell, the third single battery cell is connected between the first single battery cell and the second single battery cell, and both ends of the third single battery cell are provided with a second positive electrode tab and a second negative electrode tab; A second positive electrode tab and a second negative electrode tab are both provided on the side of the first single cell and the second single cell facing the third single cell, the second positive electrode tab of the first single cell is connected to the second positive electrode tab of the adjacent third single cell, the second negative electrode tab of the first single cell is connected to the second negative electrode tab of the adjacent third single cell, the second positive electrode tab of the second single cell is connected to the second positive electrode tab of the adjacent third single cell, and the second negative electrode tab of the second single cell is connected to the second negative electrode tab of the adjacent third single cell.

3. The battery pack according to claim 2, characterized in that: A plurality of third single cells are provided, and the second positive electrode tabs of adjacent third single cells are connected to the adjacent second positive electrode tabs, and the second negative electrode tabs of adjacent third single cells are connected to the adjacent second negative electrode tabs.

4. The battery pack according to claim 2, characterized in that: The first positive electrode tab, the first negative electrode tab, the second positive electrode tab and the second negative electrode tab all have a lead-out section, a transition section and a flattened section, the lead-out section, the transition section and the flattened section are connected in sequence, and the flattened section is located at the ends of the first positive electrode tab, the first negative electrode tab, the second positive electrode tab and the second negative electrode tab.

5. The battery pack according to claim 2, characterized in that: The prismatic cell further includes a first top cover assembly and a second top cover assembly, wherein the first top cover assembly is connected to the first opening of the housing, and the second top cover assembly is connected to the second opening of the housing; Wherein, the first top cover assembly comprises: a positive electrode top cover connected to the first opening of the housing; A first pole connected to the positive electrode top cover; A first insulating member connected between the first pole and the positive electrode top cover; A positive electrode adapter connected to the first electrode post and the first positive electrode tab; The positive electrode adapter includes a first adapter and a second adapter, the first adapter is perpendicular to the second adapter, the first adapter is attached to the first pole, and the second adapter is connected to the first positive electrode ear.

6. The battery pack according to claim 2 or 5, characterized in that: The prismatic cell further comprises: A connecting protective member, which is sleeved on the first positive electrode tab, the first negative electrode tab, the second positive electrode tab and the second negative electrode tab; The connection protection member is provided with an avoidance groove, and the avoidance groove is used to accommodate the first positive electrode tab, the first negative electrode tab, the second positive electrode tab and the second negative electrode tab, and the end face of the connection protection member matches the end face of the single battery cell.

7. The battery pack according to claim 1, characterized in that: The box body is provided with a liquid cooling channel, the outer surface of the liquid cooling channel is in contact with the outer surface of the shell, and the outer surface of the liquid cooling channel matches the shape of multiple outer surfaces of the shell.

8. The battery pack according to claim 7, characterized in that: The prismatic cell comprises: a first prismatic cell, wherein a plurality of the first prismatic cells are connected in the first direction to form a first cell group, the first prismatic cells have first side surfaces facing each other in the first direction, adjacent first prismatic cells are bonded via the first side surfaces, and the first prismatic cells further have second side surfaces and third side surfaces facing each other; A second prismatic cell, a plurality of the second prismatic cells are connected in the first direction to form a second cell group, the second prismatic cells have fourth side surfaces facing each other in the first direction, adjacent second prismatic cells are bonded via the fourth side surfaces, the second prismatic cell also has a fifth side surface and a sixth side surface facing each other, the second side surface is bonded to the fifth side surface, and the third side surface is bonded to the sixth side surface in the second direction, and the second direction is perpendicular to the first direction.

9. The battery pack according to claim 8, characterized in that: The box body comprises a bottom plate, a frame and an upper cover, wherein the bottom plate, the frame and the upper cover are arranged to form a space for accommodating the battery module; The liquid cooling channel includes a first liquid cooling channel, the first liquid cooling channel extends along the third direction, the third direction is perpendicular to the first direction and the second direction, the bottom plate has the first liquid cooling channel, and the outer surface of the first liquid cooling channel is in contact with the fifth side surface and the sixth side surface; The liquid cooling channel includes a first liquid cooling channel, which extends along a third direction, and the third direction is perpendicular to the first direction and the second direction. The bottom plate has the first liquid cooling channel, and the outer surface of the first liquid cooling channel is in contact with the fifth side surface and the sixth side surface.

10. The battery pack according to claim 7, characterized in that: The liquid cooling channel comprises: A plurality of first flow channels with openings at both ends extending along a third direction; A first blocking member connected to one end of the plurality of first flow channels, the first blocking member having a second flow channel and a water inlet, the water inlet being connected to the second flow channel; A second blocking member connected to the other end of the plurality of first flow channels, the second blocking member having a third flow channel and a water outlet, the water outlet being connected to the third flow channel; The coolant enters from the water inlet, flows through the second flow channel, the first flow channels and the third flow channel, and is discharged from the water outlet.

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