Battery pack

Abstract

This application relates to a battery pack, including a housing and a battery module. The battery module is connected to the housing. The battery module includes multiple prismatic cells that are bonded together along a first direction and a second direction. Each prismatic cell includes a housing and a cell assembly. The housing is a prismatic cell extending along a third direction. The cell assembly includes at least two parallel-connected individual cells. Each individual cell includes a first individual cell and a second individual cell. The first individual cell has a first positive electrode tab, and the second individual cell has a first negative electrode tab. The first positive electrode tab constitutes the positive connection terminal of the cell assembly, and the first negative electrode tab constitutes the negative connection terminal of the cell assembly. The battery pack provided by this application integrates at least two individual cells within a prismatic housing, and the at least two individual cells are connected in parallel, which can increase the capacity of the individual cells.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] Currently, many battery manufacturers are using multi-core parallel connection schemes to increase the energy capacity of battery packs. However, battery packs have complex structures and structural stability issues. Summary of the Invention

[0003] In view of this, embodiments of this application provide a battery pack to solve at least one problem existing in the background art.

[0004] In a first aspect, embodiments of this application provide a battery pack, the battery pack comprising:

[0005] Box;

[0006] A battery module is connected to the housing, and the battery module includes a plurality of prism cells that are bonded together along a first direction and a second direction;

[0007] The prism-shaped battery cell includes:

[0008] A shell, the shell being prism-shaped and extending along a third direction, the shell having a first opening and a second opening at its two ends respectively;

[0009] A battery cell assembly includes at least two parallel-connected individual battery cells located within a housing. Each individual battery cell includes a first individual battery cell and a second individual battery cell. The first individual battery cell is disposed near a first opening and has a first positive electrode tab. The second individual battery cell is disposed near a second opening and has a first negative electrode tab. The first positive electrode tab of the first individual battery cell constitutes the positive connection terminal of the battery cell assembly, and the first negative electrode tab of the second individual battery cell constitutes the negative connection terminal of the battery cell assembly.

[0010] In conjunction with the first aspect of this application, in an optional embodiment, the battery pack further includes a third individual battery cell, the third individual battery cell being connected between the first individual battery cell and the second individual battery cell, and both ends of the third individual battery cell being provided with a second positive electrode tab and a second negative electrode tab;

[0011] Both the first and second individual battery cells have a second positive electrode and a second negative electrode on the side facing the third individual battery cell. The second positive electrode of the first individual battery cell is connected to the second positive electrode of the adjacent third individual battery cell, and the second negative electrode of the first individual battery cell is connected to the second negative electrode of the adjacent third individual battery cell. The second positive electrode of the second individual battery cell is connected to the second positive electrode of the adjacent third individual battery cell, and the second negative electrode of the second individual battery cell is connected to the second negative electrode of the adjacent third individual battery cell.

[0012] In conjunction with the first aspect of this application, in an optional embodiment, the third single cell is provided with a plurality of second positive electrodes, the second positive electrodes of adjacent third single cells are connected to the adjacent second positive electrodes, and the second negative electrodes of adjacent third single cells are connected to the adjacent second negative electrodes.

[0013] In conjunction with the first aspect of this 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 each have a lead-out section, a transition section, and a flattening section, wherein the lead-out section, the transition section, and the flattening section are connected in sequence, and the flattening section is located at the end of the first positive electrode tab, the first negative electrode tab, the second positive electrode tab, and the second negative electrode tab.

[0014] In conjunction with the first aspect of this 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 being connected to the first opening of the housing, and the second top cover assembly being connected to the second opening of the housing;

[0015] The first top cover assembly includes:

[0016] A positive electrode top cover, which is connected to the first opening of the housing;

[0017] The first terminal post is connected to the positive terminal top cover;

[0018] The first insulating element is connected between the first electrode post and the positive electrode top cover;

[0019] A positive electrode adapter piece is connected to the first electrode post and the first positive electrode tab;

[0020] The positive electrode adapter includes a first adapter and a second adapter. The first adapter is perpendicular to the second adapter and is attached to the first electrode post. The second adapter is connected to the first positive electrode tab.

[0021] In conjunction with the first aspect of this application, in an optional embodiment, the prismatic cell further includes:

[0022] A connecting protective component is sleeved on the first positive electrode tab, the first negative electrode tab, the second positive electrode tab, and the second negative electrode tab;

[0023] The connecting protective component is provided with a clearance groove, which 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 connecting protective component matches the end face of the single cell.

[0024] In conjunction with the first aspect of this application, in an optional embodiment, the housing is provided with a liquid cooling channel, the outer surface of the liquid cooling channel being attached to the outer surface of the housing, and the outer surface of the liquid cooling channel matching the shape of a plurality of the outer surfaces of the housing.

[0025] In conjunction with the first aspect of this application, in an alternative embodiment, the prismatic battery cell includes:

[0026] A first prism cell, a plurality of first prism cells are connected in the first direction to form a first cell group, the first prism cells have first sides facing each other in the first direction, adjacent first prism cells are attached to each other through the first sides, and the first prism cells also have second sides and third sides facing each other.

[0027] The second prism cell, a plurality of the second prism cells are connected in the first direction to form a second cell group. The second prism cells have fourth sides facing each other in the first direction. Adjacent second prism cells are bonded together through the fourth sides. The second prism cells also have fifth and sixth sides facing each other. In the second direction, the second side is bonded to the fifth side and the third side is bonded to the sixth side. The second direction is perpendicular to the first direction.

[0028] In conjunction with the first aspect of this application, in an optional embodiment, the housing includes a base plate, a frame, and a top cover, the base plate, the frame, and the top cover enclosing a space for accommodating the battery module;

[0029] The liquid cooling channel includes a first liquid cooling channel, which extends along the third direction and is perpendicular to the first direction and the second direction. The base plate has the first liquid cooling channel, and the outer surface of the first liquid cooling channel is attached to the fifth side and the sixth side.

[0030] The liquid cooling channel includes a first liquid cooling channel that extends along a third direction, which is perpendicular to the first direction and the second direction. The base plate has the first liquid cooling channel, and the outer surface of the first liquid cooling channel is attached to the fifth side and the sixth side.

[0031] In conjunction with the first aspect of this application, in an optional embodiment, the liquid cooling channel includes:

[0032] Multiple first flow channels with openings at both ends and extending in a third direction;

[0033] A first sealing element is connected to one end of a plurality of first flow channels. The first sealing element has a second flow channel and an inlet, the inlet being connected to the second flow channel.

[0034] A second sealing element is connected to the other end of a plurality of first flow channels. The second sealing element has a third flow channel and a water outlet, the water outlet being connected to the third flow channel.

[0035] Coolant enters from the inlet, flows through the second flow channel, the plurality of first flow channels and the third flow channel, and exits from the outlet.

[0036] The battery pack provided in this application integrates at least two individual battery cells within a prism-shaped housing, and these at least two individual battery cells are connected in parallel, which can increase the capacity of each individual battery cell. Furthermore, integrating at least two individual battery cells within the same housing not only significantly reduces the manufacturing complexity of the battery pack and reduces connecting components, but also saves space and improves space utilization.

[0037] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0039] Figure 1 This is an exploded view of the overall structure of the battery pack provided in the embodiments of this application;

[0040] Figure 2 This is an exploded view of the prism cell structure in the battery pack provided in the embodiments of this application;

[0041] Figure 3a A schematic diagram showing the connection of the first single cell, the third single cell, and the second single cell in the battery pack provided in this application embodiment;

[0042] Figure 3b A schematic diagram showing the connection of the first single cell, two third single cells, and the second single cell in a battery pack provided in an embodiment of this application.

[0043] Figure 3c for Figure 3a A partial structural schematic diagram of the cross-section at point AA;

[0044] Figure 4 This is an exploded view of the structure of a single battery cell in a battery pack provided in an embodiment of this application;

[0045] Figure 5 A schematic diagram of the structure of the first individual battery cell and the first top cover assembly in the battery pack provided in an embodiment of this application;

[0046] Figure 6 This is a schematic diagram of the structure of the battery module in the battery pack provided in the embodiments of this application;

[0047] Figure 7 A three-dimensional structural diagram of the connection protection component in the battery pack provided in the embodiments of this application;

[0048] Figure 8 This is a partial structural diagram of multiple prismatic cells, a top cover, and a bottom plate in a battery pack provided in an embodiment of this application.

[0049] Figure 9 An exploded view of the base plate and the first liquid cooling channel in the battery pack provided in the embodiments of this application;

[0050] Figure 10 for Figure 9 Enlarged view of point C in the middle.

[0051] Figure label:

[0052] 100. Battery pack; 10. Housing; 1a. Liquid cooling channel; 11a. First liquid cooling channel; 12a. Second liquid cooling channel; 1a1. First channel; 1a2. First sealing element; 1a21. Inlet; 1a3. Second sealing element; 1a31. Outlet; 1a32. Triangular plate; 1a33. Third channel; 110. Base plate; 120. Frame; 130. Top cover;

[0053] 20. Battery module; 210. Prismatic cell; 211. Housing; 2111. First opening; 2112. Second opening;

[0054] 212. Single battery cell;

[0055] 21a, First prism cell; 21a1, First side surface; 21a2, Second side surface; 21a3, Third side surface; 21b, Second prism cell; 21b1, Fourth side surface; 21b2, Fifth side surface; 21b3, Sixth side surface;

[0056] 21c, Positive electrode plate; 21d, First separator; 21e, Negative electrode plate; 21f, Second separator; 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;

[0057] 213. Connecting protective component; 2131. Clearance groove;

[0058] 214. First top cover assembly; 2141. Positive electrode top cover; 2142. First electrode post; 2143. First insulating component; 2144. Positive electrode adapter piece; 2145. First adapter piece; 2146. Second adapter piece;

[0059] 215. Second top cover assembly;

[0060] 216. Positive pole region; 217. Negative pole region. Detailed Implementation

[0061] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the disclosure of the present application to those skilled in the art.

[0062] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, to avoid confusion with this application, some technical features well-known in the art have not been described; that is, not all features of actual embodiments are described herein, nor are well-known functions and structures described in detail.

[0063] In the accompanying drawings, for clarity, the dimensions of layers, areas, and elements, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0064] 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 may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this application, the first element, component, area, layer, or portion discussed below may be referred to as a second element, component, area, layer, or portion. And the discussion of a second element, component, area, layer, or portion does not imply that the first element, component, area, layer, or portion necessarily exists in this application.

[0065] Spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one 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, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0066] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0067] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0068] like Figures 1 to 4 As shown, this application embodiment provides a battery pack 100, including a housing 10 and a battery module 20. The battery module 20 is connected inside the housing 10, and the battery module 20 includes multiple components along a first direction. Figure 1 The arrows shown in the diagram indicate the direction of arrow s1 and the second direction. Figure 1 The prism cell 210 is attached in the direction of arrow s2 shown in the figure.

[0069] The prismatic cell 210 includes a housing 211 and a cell assembly. The housing 211 is prismatic in shape, and the housing 211 extends along a third direction. Figure 1 As shown by arrow s3, the housing 211 has a first opening 2111 and a second opening 2112 at its two ends. The battery pack includes at least two parallel-connected individual battery cells 212, located within the housing 211. Each individual battery cell 212 includes a first individual battery cell 2121 and a second individual battery cell 2122. The first individual battery cell 2121 is positioned near the first opening 2111 and has a first positive electrode tab 212a. The second individual battery cell 2122 is positioned near the second opening 2112 and has a first negative electrode tab 212b. The first positive electrode tab 212a of the first individual battery cell 2121 forms the positive connection terminal of the battery pack, and the first negative electrode tab 212b of the second individual battery cell 2122 forms the negative connection terminal of the battery pack.

[0070] The battery pack 100 integrates at least two individual battery cells 212 within a prism-shaped housing 211, and the at least two individual battery cells 212 are connected in parallel, which can increase the capacity of the prism cell 210. Furthermore, integrating at least two individual battery cells 212 within the same housing 211 not only significantly reduces the manufacturing complexity of the battery pack 100 and reduces the number of connecting components, but also saves space and improves space utilization.

[0071] Figure 2 The image shows a shell 211 in the shape of a regular hexagonal prism. Of course, the shape of the shell 211 is not limited to a regular hexagonal prism. The shape of the shell 211 can also be a pentagonal prism, an octagonal prism, a decaprism, etc., which can be set according to specific needs. This application embodiment does not limit the shape.

[0072] In an alternative embodiment, such as Figure 3aAs shown, the battery pack also includes a third individual battery cell 2123, which is connected between the first individual battery cell 2121 and the second individual battery cell 2122. Both ends of the third individual battery cell 2123 are provided with a second positive electrode tab 212c and a second negative electrode tab 212d. The first single cell 2121 and the second single cell 2122 are each provided with a second positive electrode tab 212c and a second negative electrode tab 212d on the 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. 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.

[0073] Furthermore, such as Figure 3b As shown, multiple third-cell batteries 2123 are provided. The second positive electrode tab 212c of adjacent third-cell batteries 2123 is connected to the adjacent second positive electrode tab 212c, and the second negative electrode tab 212d of adjacent third-cell batteries 2123 is connected to the adjacent second negative electrode tab 212d.

[0074] like Figure 3c and Figure 4 As shown, the single cell 212 is composed of a first separator 21d, a positive electrode 21c, a second separator 21f, a negative electrode 21e, and an aluminum-plastic film 212e. The first separator 21d, the positive electrode 21c, the second separator 21f, and the negative electrode 21e are stacked in sequence, and their starting point is formed by winding with a winding needle. The shape of the winding needle can be cylindrical or prismatic, so the shape of the bare cell is cylindrical or prismatic. This application embodiment does not make specific limitations and can be selected according to the needs. Figure 3c The image shows a device made of cylindrical spinning needles.

[0075] Each cell 212 has a positive electrode region 216 and a negative electrode region 217. The positive electrode region 216 and the negative electrode region 217 are symmetrically arranged about the axis of the cell 212. The negative electrode plate 21e in the positive electrode region 216 is recessed into the separator, and the positive electrode plate 21c in the negative electrode region 217 is recessed into the separator to ensure mutual insulation.

[0076] The second positive electrode tab 212c and the second negative electrode tab 212d located at the same end of the single cell 212 are symmetrically arranged with respect to the axis of the single cell 212.

[0077] The first positive electrode tab 212a and the first negative electrode tab 212b of the prismatic cell 210 are located at its two ends, which can prevent conductivity through the aluminum-plastic film 212e of the single cell 212, thereby greatly reducing the internal resistance of the prismatic cell 210 and improving the safety of the battery pack 100 during the assembly process.

[0078] In an alternative embodiment, such as 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 each have a lead-out section 212f, a transition section 212g, and a flattening section 212h. The lead-out section 212f, the transition section 212g, and the flattening section 212h are connected in sequence, and the flattening section 212h is located at the end 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.

[0079] The bare battery cell is covered by an aluminum-plastic film 212e. After the bare battery cell is encapsulated by the aluminum-plastic film 212e, one end is first plastic-sealed, and electrolyte is injected into the other end. Then, the other end is plastic-sealed again, thus obtaining a single battery cell 212 with a pair of positive and negative tabs at both ends. Each positive and negative tab has a lead-out section 212f, a transition section 212g, and a flattening section 212h to facilitate connection between the tab and other tabs, ensuring a strong connection between the tabs. The connection between the tabs can be achieved through laser welding, ultrasonic welding, riveting, crimping, etc., and this application embodiment does not specifically limit the method.

[0080] In an alternative embodiment, such as Figure 2 and Figure 5 As shown, the prism cell 210 also 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 will be described here.

[0081] Specifically, the first top cover assembly 214 includes a positive electrode top cover 2141, a first electrode post 2142, a first insulating member 2143, and a positive electrode adapter piece 2144. The positive electrode top cover 2141 is connected to the first opening 2111 of the housing 211, the first electrode post 2142 is connected to the positive electrode top cover 2141, and the first insulating member 2143 is connected between the first electrode post 2142 and the positive electrode top cover 2141. The positive electrode adapter piece 2144 is connected to the first electrode post 2142 and the first positive electrode tab 212a. The positive electrode adapter piece 2144 includes a first adapter piece 2145 and a second adapter piece 2146. The first adapter piece 2145 is perpendicular to the second adapter piece 2146. The first adapter piece 2145 is fitted and connected to the first electrode post 2142, and the second adapter piece 2146 is connected to the first positive electrode tab 212a.

[0082] The second adapter piece 2146 is vertically connected to the bottom of the first adapter piece 2145, which allows the positive adapter piece 2144 to have deformation, that is, the first adapter piece 2145 can be bent relative to the second adapter piece 2146. This allows the first top cover assembly 214 and the second top cover assembly 215 to have a certain amount of buffer, further ensuring the structural stability and safety of the prism cell 210.

[0083] The positive electrode top cover 2141 and the negative electrode top cover are made by nano-injection molding process. The first electrode post 2142 is made of aluminum or copper, and the shell 211 is made of high-strength metal materials such as steel or aluminum, but it is not limited to these.

[0084] In an alternative embodiment, such as Figure 2 , Figure 6 and Figure 7 As shown, the prism-shaped battery cell 210 also includes a connecting protective 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 connecting protective member 213 is provided with a relief 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 connecting protective member 213 matches the end face of the individual battery cell 212.

[0085] Specifically, the connecting protective component 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.

[0086] The end face of the connecting protective component 213 matches the end face of the single cell 212, which can greatly reduce the occurrence of damage to the single cell 212 under external force; the connecting protective component 213 can not only protect the positive and negative tabs, but also improve the structural strength of the entire prism cell 210.

[0087] In an alternative embodiment, such as Figure 1 As shown, the housing 10 is provided with a liquid cooling channel 1a. The outer surface of the liquid cooling channel 1a is attached to the outer surface of the housing 211, and the shape of the outer surface of the liquid cooling channel 1a matches the outer surface of the multiple housings 211. The liquid cooling channel 1a has a contoured structure that matches the housings 211 of the multiple prism cells 210, which can increase the contact area between the liquid cooling channel 1a and the prism cells 210, thereby improving the heat dissipation capacity of the battery pack 100.

[0088] In an alternative embodiment, such as Figure 1 and Figure 8 As shown, the prism cell along Figure 1 As shown by arrow s3, extending in the direction of the prism cell 210, the prism cell 210 includes a first prism cell 21a and a second prism cell 21b.

[0089] Among them, multiple first prism cells 21a in the first direction, i.e. Figure 1 The first battery cell group is formed by connecting the components in the direction of arrow s1 shown in the figure. The first prism battery cell 21a has a first side surface 21a1 facing each other in the first direction. Adjacent first prism battery cells 21a are attached to each other through the first side surface 21a1. The first prism battery cell 21a also has a second side surface 21a2 and a third side surface 21a3 facing each other.

[0090] Multiple second prism cells 21b in the first direction, i.e. Figure 1 The second battery cell group is formed by connecting the components in the direction of arrow s1 shown in the diagram. The second prism battery cell 21b has four opposing fourth sides 21b1 in the first direction, and adjacent second prism battery cells 21b are bonded together through the fourth sides 21b1. The second prism battery cell 21b also has five opposing fifth sides 21b2 and a sixth opposing side 21b3. In the second direction... Figure 1 In the direction of arrow s2 shown, the second side 21a2 and the fifth side 21b2 are attached, and the third side 21a3 and the sixth side 21b3 are attached, and the second direction is perpendicular to the first direction.

[0091] Figure 8The diagram shows that the second side 21a2 and the third side 21a3 of the first prism 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 prism 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 prism cell 210, which increases the contact area between the liquid cooling channel 1a and the prism cell 210, thereby improving the heat dissipation capacity of the battery pack 100.

[0092] In addition, adjacent first prism cells 21a, adjacent second prism cells 21b, and adjacent first prism cells 21a and second prism cells 21b are all directly connected and bonded together, which not only facilitates the formation of multiple first cell groups and multiple second cell groups, but also improves the structural strength of the battery module 20.

[0093] In an alternative embodiment, such as Figure 1 and Figure 8 As shown, the housing 10 includes a bottom plate 110, a side frame 120 and a top cover 130. The bottom plate 110, the side frame 120 and the top cover 130 form a receiving cavity, and the battery module 20 is located in the receiving cavity.

[0094] The liquid cooling channel 1a includes a first liquid cooling channel 11a, which is located along a third direction. Figure 1 The arrow s3 shown in the figure extends in the direction of the third direction, which is perpendicular to the first direction and the second direction. The base plate 110 has a first liquid cooling channel 11a. 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 prism cell 21b.

[0095] In an optional embodiment, the liquid cooling channel 1a includes a second liquid cooling channel 12a, the second liquid cooling channel 12a being along a third direction, i.e. Figure 1 As shown by arrow s3, the upper cover 130 has a second liquid cooling channel 12a, and the outer surface of the second liquid cooling channel 12a is attached to the second side 21a2 and the third side 21a3.

[0096] 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. The second liquid cooling channel 12a is in close contact with the first prism cell 21a, and the first liquid cooling channel 11a is in close contact with the second prism cell 21b. This can increase the contact area between the prism cell 210 and the liquid cooling channel 1a and improve the heat dissipation effect of the prism cell 210.

[0097] In an optional embodiment, both the base plate 110 and the top cover 130 are profile structures. Both the base plate 110 and the top cover 130 have channels with rectangular cross-sections, which can improve the heat dissipation effect of the prism cell 210. Moreover, the profile structure has the characteristics of being lightweight and high-strength, thereby improving the overall stability and safety of the prism battery pack 100.

[0098] In an alternative embodiment, such as Figure 1 , Figure 9 and Figure 10 As shown, the liquid cooling channel 1a includes multiple channels with openings at both ends along a third direction. Figure 9 The diagram shows a first flow channel 1a1, a first sealing element 1a2, and a second sealing element 1a3 extending in the direction of arrow s3. The first sealing element 1a2 is connected to one end of the plurality of first flow channels 1a1, and has a second flow channel and an inlet 1a21, with the inlet 1a21 communicating with the second flow channel. The second sealing element 1a3 is connected to the other end of the plurality of first flow channels 1a1, and has a third flow channel 1a33 and an outlet 1a31, with the outlet 1a31 communicating with the third flow channel 1a33.

[0099] Coolant enters the second flow channel of the first sealing member 1a2 from the inlet 1a21 and flows along... Figure 9 The coolant flows in the direction of arrow s1 shown in the diagram and flows into multiple first channels 1a1. The coolant flows along the first channels 1a1. Figure 9 The water flows in the direction of arrow s3 shown in the figure, and finally flows into the third channel 1a33 and is discharged from the outlet 1a31.

[0100] In an optional embodiment, the cross-section of the first flow channel 1a1 is an isosceles triangle. The isosceles triangular cross-section of the first flow channel 1a1 serves two purposes: firstly, it increases the contact area between the hexagonal prism-structured prism cell 210 and the first flow channel 1a1; secondly, this structure provides strong structural strength, further ensuring the structural stability and safety of the prism battery pack 100.

[0101] In an alternative embodiment, such as Figure 10 As shown, the first sealing member 1a2 and the second sealing member 1a3 have the same structure. The first sealing member 1a2 is provided with a plurality of triangular plates 1a32 on the side close to the first flow channel 1a1. The triangular plates 1a32 are connected between adjacent first flow channels 1a1.

[0102] The triangular plate 1a32 is used to match the opening of the first sealing member 1a2 with the first flow channel 1a1, so as to facilitate sealing the first flow channel 1a1 and the second flow channel, as well as the first flow channel 1a1 and the third flow channel 1a33, and can 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.

[0103] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A battery pack, characterized in that, include: Box; A battery module is connected to the housing, and the battery module includes a plurality of prism cells that are bonded together along a first direction and a second direction; The prism-shaped battery cell includes: A shell, the shell being prism-shaped and extending along a third direction, the shell having a first opening and a second opening at its two ends respectively; A battery cell assembly includes at least two parallel-connected individual battery cells located within a housing. Each individual battery cell includes a first individual battery cell and a second individual battery cell. The first individual battery cell is disposed near a first opening and has a first positive electrode tab. The second individual battery cell is disposed near a second opening and has a first negative electrode tab. The first positive electrode tab of the first individual battery cell constitutes the positive connection terminal of the battery cell assembly, and the first negative electrode tab of the second individual battery cell constitutes the negative connection terminal of the battery cell assembly. The battery pack also includes a third individual battery cell, which is connected between the first individual battery cell and the second individual battery cell. The third individual battery cell has a second positive electrode and a second negative electrode at both ends. The prismatic battery cell also includes: A connecting protective component is sleeved onto the first positive electrode tab, the first negative electrode tab, the second positive electrode tab, and the second negative electrode tab; the connecting protective component is provided with a clearance groove for accommodating 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 connecting protective component matches the end face of the individual battery cell; the housing is provided with a liquid cooling channel, the outer surface of the liquid cooling channel is attached to the outer surface of the housing, and the outer surface of the liquid cooling channel matches the shape of the plurality of outer surfaces of the housing; The prismatic cell includes a first prismatic cell and a second prismatic cell. Adjacent first prismatic cells, adjacent second prismatic cells, and adjacent first prismatic cells and second prismatic cells are all directly facing and bonded together. The housing includes a bottom plate, a frame, and a top cover. A second liquid cooling channel and a first liquid cooling channel are respectively provided on the top cover and the bottom plate. The second liquid cooling channel is bonded to the first prismatic cell, and the first liquid cooling channel is bonded to the second prismatic cell.

2. The battery pack according to claim 1, characterized in that, Both the first and second individual battery cells have a second positive electrode and a second negative electrode on the side facing the third individual battery cell. The second positive electrode of the first individual battery cell is connected to the second positive electrode of the adjacent third individual battery cell, and the second negative electrode of the first individual battery cell is connected to the second negative electrode of the adjacent third individual battery cell. The second positive electrode of the second individual battery cell is connected to the second positive electrode of the adjacent third individual battery cell, and the second negative electrode of the second individual battery cell is connected to the second negative electrode of the adjacent third individual battery cell.

3. The battery pack according to claim 2, characterized in that, The third single cell is provided in multiple ways. The second positive electrode tab of the adjacent third single cell is connected to the adjacent second positive electrode tab, and the second negative electrode tab of the adjacent third single cell is connected to the adjacent second negative electrode tab.

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 each 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 end 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, the first top cover assembly being connected to the first opening of the housing, and the second top cover assembly being connected to the second opening of the housing; The first top cover assembly includes: A positive electrode top cover, which is connected to the first opening of the housing; The first terminal post is connected to the positive terminal top cover; The first insulating element is connected between the first electrode post and the positive electrode top cover; A positive electrode adapter piece is 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 and is attached to the first electrode post. The second adapter is connected to the first positive electrode tab.

6. The battery pack according to claim 1, characterized in that, Multiple first prism cells are connected in the first direction to form a first cell group. The first prism cells have first sides facing each other in the first direction. Adjacent first prism cells are attached to each other through the first sides. The first prism cells also have second and third sides facing each other. Multiple second prism cells are connected in the first direction to form a second cell group. The second prism cells have fourth sides facing each other in the first direction. Adjacent second prism cells are bonded together through the fourth sides. The second prism cells also have fifth and sixth sides facing each other. In the second direction, the second side is bonded to the fifth side, and the third side is bonded to the sixth side. The second direction is perpendicular to the first direction.

7. The battery pack according to claim 6, characterized in that, The base plate, the frame, and the top cover enclose a space for accommodating the battery module; The liquid cooling channel includes a first liquid cooling channel that extends along the third direction, which is perpendicular to the first direction and the second direction. The base plate has the first liquid cooling channel, and the outer surface of the first liquid cooling channel is attached to the fifth side and the sixth side.

8. The battery pack according to claim 1, characterized in that, The liquid cooling channel includes: Multiple first flow channels with openings at both ends and extending in a third direction; A first sealing element is connected to one end of a plurality of first flow channels. The first sealing element has a second flow channel and an inlet, the inlet being connected to the second flow channel. A second sealing element is connected to the other end of a plurality of first flow channels. The second sealing element has a third flow channel and a water outlet, the water outlet being connected to the third flow channel. Coolant enters from the inlet, flows through the second flow channel, the plurality of first flow channels and the third flow channel, and exits from the outlet.

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