Intermediate cover, battery components, battery pack and vehicle

Abstract

This application relates to an intermediate cover plate, a battery assembly, a battery pack, and a vehicle. The intermediate cover plate is used to connect a first battery and a second battery. The intermediate cover plate includes an intermediate insulator and an intermediate terminal post. The intermediate insulator includes a first side, a second side, and a receiving opening; the first side and the second side are disposed opposite each other along the thickness direction; the receiving opening penetrates the intermediate insulator along the thickness direction. The intermediate terminal post is disposed in the receiving opening and includes a connected intermediate positive terminal and an intermediate negative terminal; the intermediate positive terminal protrudes from the receiving opening towards the first side; the intermediate negative terminal protrudes from the receiving opening towards the second side. The intermediate positive terminal is used to connect to the positive terminal tab of the first battery; the intermediate negative terminal is used to connect to the negative terminal tab of the second battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to an intermediate cover plate, a battery assembly, a battery pack, and a vehicle. Background Technology

[0002] With the increasing popularity of new energy vehicles, people are paying particular attention to battery range, charging speed, cycle life, and battery safety. Attributes related to battery performance are one of the core competitive advantages of new energy vehicles. Consumers are placing higher demands on the range, charging speed, cycle life, and battery safety of new energy vehicles.

[0003] Due to the requirements of fast charging, battery packs need to meet voltages of 800V or higher, even reaching 1000V. This means that the battery pack needs to connect more cells in series. To achieve better manufacturing of individual cells, the thickness of blade cells is typically ≥13.5mm. However, the height is limited by the overall vehicle design, such as ground clearance, wind resistance, and passenger compartment space. Therefore, within the same envelope size, to achieve a higher voltage battery pack, the length of individual cells needs to be shortened to allow for more cells to be connected in series. More cells in series result in more terminals and connecting tabs between them, leading to a decrease in the overall pack volume utilization. Utility Model Content

[0004] This application provides an intermediate cover, a battery assembly, a battery pack, and a vehicle to address some or all of the shortcomings in the related technologies.

[0005] A first aspect of this application provides an intermediate cover plate. The intermediate cover plate is used to connect a first battery and a second battery; the intermediate cover plate includes:

[0006] An intermediate insulating member includes a first side, a second side, and a receiving opening; the first side and the second side are disposed opposite each other along the thickness direction; the receiving opening penetrates the intermediate insulating member along the thickness direction; and

[0007] An intermediate electrode post, disposed in the receiving opening, includes a connected intermediate positive electrode and an intermediate negative electrode; the intermediate positive electrode protrudes from the receiving opening towards the first side; the intermediate negative electrode protrudes from the receiving opening towards the second side.

[0008] The intermediate positive electrode is used to connect to the positive electrode tab of the first battery; the intermediate negative electrode is used to connect to the negative electrode tab of the second battery.

[0009] Further, the intermediate insulating member includes a body portion and a boss portion; the boss portion is disposed on the surface of the body portion facing the first side and / or facing the second side; the intermediate cover plate further includes:

[0010] An aluminum sheet is disposed around the protrusion portion and connected to the body portion;

[0011] An insulating plate is disposed on the side of the aluminum sheet away from the main body; the insulating plate includes an electrode opening, and the intermediate electrode protrudes from the electrode opening.

[0012] Furthermore, the boss portion includes a transition unit and a lug unit; the transition unit is disposed between the lug unit and the body portion; the projected area of ​​the transition unit in the thickness direction is smaller than the projected area of ​​the lug unit in the thickness direction.

[0013] The aluminum sheet is arranged around the transition unit and is engaged between the lug unit and the main body; the insulating plate abuts against the lug unit.

[0014] Furthermore, the boss portion includes a limiting protrusion extending along the thickness direction; the limiting protrusion is disposed on the side of the boss portion away from the body portion; the insulating plate includes a limiting hole; the limiting protrusion is received in the limiting hole; and / or,

[0015] The insulating plate includes a flange extending toward the body portion; the flange is disposed around the boss portion; the flange abuts against the aluminum sheet.

[0016] Furthermore, the intermediate insulating member includes an abutting boss disposed in the receiving opening;

[0017] The intermediate positive electrode includes a positive electrode abutting unit disposed near the first side and a positive electrode connecting unit disposed away from the first side; the positive electrode connecting unit connects the positive electrode abutting unit and the intermediate negative electrode; the positive electrode abutting unit abuts against the surface of the abutting protrusion facing the first side; and / or, the intermediate negative electrode includes a negative electrode abutting unit disposed near the second side and a negative electrode connecting unit disposed away from the second side; the negative electrode connecting unit connects the negative electrode abutting unit and the intermediate positive electrode; the negative electrode abutting unit abuts against the surface of the abutting protrusion facing the second side.

[0018] Furthermore, the dimension of the intermediate insulating member in the length direction is larger than the dimension of the intermediate insulating member in the width direction; the length direction and the width direction are respectively perpendicular to the thickness direction; wherein,

[0019] In the length direction, the ratio of the size of the intermediate pole to the size of the intermediate insulator is greater than or equal to 0.65 and less than or equal to 0.8; and / or, in the width direction, the ratio of the size of the intermediate pole to the size of the intermediate insulator is greater than or equal to 0.7 and less than or equal to 0.95.

[0020] A second aspect of this application provides a battery assembly, comprising:

[0021] The first battery includes a first casing, a first cell, and a negative electrode cover plate; the first casing houses the first cell; the first cell includes a first positive electrode tab and a first negative electrode tab; the negative electrode cover plate is connected to one side of the first casing and communicates with the first negative electrode tab.

[0022] A second battery includes a second housing, a second battery cell, and a positive electrode cover. The second housing contains the second battery cell. The second battery cell includes a second positive electrode tab and a second negative electrode tab. The positive electrode cover is connected to one side of the second housing and communicates with the second positive electrode tab.

[0023] The intermediate cover plate described in the foregoing embodiment; the intermediate cover plate is connected to the first housing and the second housing along the thickness direction; wherein, the intermediate positive electrode is connected to the first positive electrode tab; and the intermediate negative electrode is connected to the second negative electrode tab.

[0024] Furthermore, the first battery includes a first explosion-proof valve; the first explosion-proof valve is disposed in the first housing; and / or,

[0025] The second battery includes a second explosion-proof valve; the second explosion-proof valve is disposed in the second housing; and / or;

[0026] The dimension of the battery assembly in the thickness direction is greater than or equal to 600 mm.

[0027] A third aspect of this application provides a battery pack including a plurality of battery components as described in the foregoing embodiments; the dimensions of the battery components in the length direction are greater than the dimensions of the battery components in the width direction; the length direction and the width direction are respectively perpendicular to the thickness direction; the plurality of battery components are arranged along the width direction and are electrically conductive.

[0028] A fourth aspect of this application provides a vehicle including the battery pack described in the foregoing embodiments.

[0029] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0030] As can be seen from the above embodiments, the intermediate cover plate of this application enables multiple batteries to be connected in series, thereby increasing the voltage of the battery module, while avoiding the reduction in volume utilization caused by series connection. Thus, the battery module equipped with the intermediate cover plate of this application can have a higher voltage, thereby improving fast charging capability.

[0031] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 The diagram shows an overall schematic representation of an embodiment of the battery assembly of this application;

[0034] Figure 2 Shown as Figure 1 An exploded view of the battery assembly shown.

[0035] Figure 3 The diagram shows an overall schematic representation of one embodiment of the intermediate cover plate of this application;

[0036] Figure 4 An exploded view of one embodiment of the intermediate cover plate of this application is shown;

[0037] Figure 5 The diagram shown is a simplified cross-sectional view of one embodiment of the intermediate insulating element of this application;

[0038] Figure 6 The diagram shown is a simplified cross-sectional view of one embodiment of the intermediate pole of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100 Battery assembly, 1 First battery, 11 First casing, 12 First cell, 121 First positive electrode tab, 122 First negative electrode tab, 13 Negative cover plate, 131 Battery negative electrode, 132 Electrolyte filling hole, 14 First explosion-proof valve, 2 Second battery, 21 Second casing, 22 Second cell, 221 Second positive electrode tab, 222 Second negative electrode tab, 23 Positive cover plate, 231 Battery positive electrode, 24 Second explosion-proof valve, 3 Intermediate cover plate, 31 Intermediate insulating component, 311 First side, 312 Second side, 313 314 Body part, 315 Boss part, 3151 Lug unit, 3152 Transition unit, 3153 Limiting protrusion, 316 Abutting boss, 32 Intermediate pole, 321 Intermediate positive pole, 3211 Positive pole abutting unit, 3212 Positive pole connecting unit, 322 Intermediate negative pole, 3221 Negative pole abutting unit, 3222 Negative pole connecting unit, 33 Plain aluminum sheet, 34 Insulating plate, 341 Pole post opening, 342 Limiting hole, 343 Flange, X Thickness direction, Y Length direction, Z Width direction. Detailed Implementation

[0041] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0042] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0043] refer to Figure 1 and Figure 2 This application provides a battery assembly 100. The battery assembly 100 includes a first battery 1 and a second battery 2. The first battery 1 includes a first housing 11, a first cell 12, and a negative electrode cover 13. The first housing 11 houses the first cell 12. The first cell 12 includes a first positive electrode tab 121 and a first negative electrode tab 122. The negative electrode cover 13 is connected to one side of the first housing 11 and communicates with the first negative electrode tab 122. Similarly, the second battery 2 includes a second housing 21, a second cell 22, and a positive electrode cover 23. The second housing 21 houses the second cell 22. The second cell 22 includes a second positive electrode tab 221 and a second negative electrode tab 222. The positive electrode cover 23 is connected to one side of the second housing 21 and communicates with the second positive electrode tab 221.

[0044] To connect the first battery 1 and the second battery 2 to form a conductive path, the battery assembly 100 of this application further includes an intermediate cover plate 3. The intermediate cover plate 3 is connected to the first housing 11 and the second housing 21 along its thickness direction X. Figure 3 and Figure 4The intermediate cover plate 3 includes an intermediate insulating member 31 and an intermediate electrode post 32. The intermediate insulating member 31 includes a first side 311, a second side 312, and a receiving opening 313. The first side 311 and the second side 312 are disposed opposite each other along the thickness direction X. The receiving opening 313 penetrates the intermediate insulating member 31 along the thickness direction X. The intermediate electrode post 32 is disposed in the receiving opening 313 and includes a connected intermediate positive electrode 321 and an intermediate negative electrode 322. The intermediate positive electrode 321 is exposed from the receiving opening 313 towards the first side 311. The intermediate negative electrode 322 is exposed from the receiving opening 313 towards the second side 312. The intermediate positive electrode 321 is connected to the first positive electrode tab 121, and the intermediate negative electrode 322 is connected to the second negative electrode tab 222.

[0045] During the use of the battery assembly 100, the electrode of the negative cover plate 13 of the first battery 1 serves as the negative electrode 131, and the electrode of the positive cover plate 23 of the second battery 2 serves as the positive electrode 231. The current between the first battery 1 and the second battery 2 is conducted through the intermediate terminal 32. The first battery 1 and the second battery 2 are electrically connected through the intermediate cover plate 3. That is, a battery assembly 100 can include multiple cells, thereby increasing the battery voltage by increasing the number of cells in series. The intermediate electrode of the intermediate cover plate 3 of this application has two polarities, thus enabling direct electrical connection between the first battery 1 and the second battery 2 without the need to separately set electrodes for the first battery 1 and the second battery 2 and then connect them through conductive components.

[0046] As can be seen, the intermediate cover plate 3 of this application enables multiple batteries to be connected in series, thereby boosting the voltage of the battery module 100, while avoiding the reduction in volume utilization caused by series connection. Thus, the battery module 100 with the intermediate cover plate 3 of this application can have a higher voltage, thereby improving fast charging capability.

[0047] Furthermore, this application also provides a battery pack (not shown). The battery pack includes a plurality of battery components 100. For example... Figure 1 and Figure 2 As shown, the dimension of the battery assembly 100 in the length direction Y is larger than its dimension in the width direction Z. Multiple battery assemblies 100 are arranged along the width direction Z and are electrically conductive. The first battery 1 and the second battery 2 of the battery assembly 100 are arranged along the thickness direction X. Therefore, the arrangement of multiple battery assemblies 100 along the width direction Z can be understood as multiple battery assemblies 100 being arranged side-by-side in the thinner direction and achieving electrical conductivity. The specific implementation of electrical conductivity is as follows: the negative electrode 131 of one battery assembly 100 is connected to the positive electrode 231 of an adjacent battery assembly 100 through a conductive element such as a tab, and the positive electrode 231 of that battery assembly 100 is connected to the negative electrode 131 of an adjacent battery assembly 100 through a conductive element.

[0048] Since each battery module 100 of this application has two batteries connected in series, the number of batteries connected in series in the battery pack increases without changing the overall volume of the battery pack. This effectively increases the voltage of the battery pack, thereby improving its fast-charging capability. Simultaneously, the intermediate cover plate 3 reduces the number of conductive components required for the batteries connected in series in the battery pack, thus effectively improving the volume utilization rate of the battery pack.

[0049] It should be noted that, for clarity and brevity, the thickness direction X, length direction Y, and width direction Z are used as reference directions in the accompanying drawings. The thickness direction X should be understood as the direction in which the thickness of the intermediate cover plate 3 extends. The thickness direction X, length direction Y, and width direction Z are mutually perpendicular. However, it should be understood that any descriptions in this application involving extension or connection along a certain direction should be interpreted as meaning that the extension or connection of a component has at least a component in that direction, and should not be interpreted as the component extending or connecting only along that direction.

[0050] To improve the safety performance of the battery assembly 100 and the battery pack, in some optional embodiments, the first battery 1 includes a first explosion-proof valve 14 disposed in the first housing 11. The second battery 2 includes a second explosion-proof valve 24 disposed in the second housing 21. Taking the first explosion-proof valve 14 as an example, the first housing 11 contains electrolyte. When the pressure inside the first housing 11 rises sharply due to overcharging, short circuit, or thermal runaway of the battery assembly 100, the first explosion-proof valve 14 can quickly open, thereby releasing the gas and energy inside the first housing 11 and preventing the first housing 11 from exploding due to pressure accumulation. Therefore, the first explosion-proof valve 14 can improve the safety of the first battery 1. Similarly, the second explosion-proof valve 24 can improve the safety of the second battery 2. Further details are omitted here.

[0051] Compared to the embodiment where the first explosion-proof valve 14 is located on the negative electrode cover plate 13, the first explosion-proof valve 14 located on the first housing 11 can free up space in the negative electrode cover plate 13, allowing the negative electrode cover plate 13 to accommodate other functional components. For example... Figure 1 As shown, the negative electrode cover 13 can be provided with an injection hole 132, thereby enabling the addition of electrolyte inside the first housing 11. Alternatively, the space freed up by the negative electrode cover 13 allows the first battery 1 to have a larger negative electrode 131. The increased area of ​​the negative electrode 131 can improve the current-carrying capacity of the battery assembly 100, thereby improving the safety of the battery assembly 100. Similarly, the second explosion-proof valve 24 disposed in the second housing 21 can also free up space in the positive electrode cover 23. This application will not elaborate further on this.

[0052] It should be noted that the battery assembly 100 may have only the first explosion-proof valve 14 disposed on the first housing 11, while the second explosion-proof valve 24 is disposed on the positive electrode cover 23. Alternatively, the battery assembly 100 may have only the second explosion-proof valve 24 disposed on the second housing 21, while the first explosion-proof valve 14 is disposed on the negative electrode cover 13.

[0053] Optionally, the dimension of the battery assembly 100 in the thickness direction X is greater than or equal to 600 mm. This dimension range can effectively guarantee the dimensions of the first battery 1 and the second battery 2, thereby ensuring the structural strength and thermal management performance of the battery assembly 100. The dimensions of the first battery 1 and the second battery 2 in the thickness direction X can be the same, so that the structures such as the first housing 11 and the second housing 21, the first cell 12 and the second cell 22 can be interchangeable during the manufacturing process of the battery assembly 100, thereby reducing the processing cost and design cost of the battery assembly 100.

[0054] Based on this, this application also provides a vehicle. The vehicle includes the battery pack described in various embodiments of this application. A vehicle equipped with the battery pack of this application can increase the number of batteries connected in series without excessively increasing the battery pack volume, thereby effectively improving the vehicle's fast charging capability.

[0055] The following description pertains to the intermediate cover plate 3 of this application.

[0056] refer to Figure 4 In some optional embodiments, the intermediate insulating member 31 includes a body portion 314 and a boss portion 315. The boss portion 315 is disposed on the surfaces of the body portion 314 facing the first side 311 and facing the second side 312. That is, in this embodiment, the number of boss portions 315 can be understood as two, and they are respectively disposed on the first side 311 and the second side 312 of the intermediate insulating member 31. The intermediate cover plate 3 also includes a light aluminum sheet 33 and an insulating plate 34. The light aluminum sheet 33 is disposed around the boss portion 315 and connected to the body portion 314. In this way, the light aluminum sheet 33 can expose the intermediate pole 32, and the boss portion 315 can also achieve insulation between the light aluminum sheet 33 and the intermediate pole 32. The insulating plate 34 is disposed on the side of the light aluminum sheet 33 away from the body portion 314. The insulating plate 34 includes a pole opening 341, through which the intermediate pole 32 is exposed.

[0057] The use of aluminum sheets 33 improves the overall structural strength of the intermediate cover plate 3, preventing damage caused by internal pressure and heat changes during battery assembly 100 operation. Furthermore, because the aluminum sheets 33 have higher structural strength than plastic and are lighter than steel sheets of the same size, they effectively improve the structural strength of the intermediate cover plate 3 while controlling excessive weight increases. Additionally, the intermediate cover plate 3 uses two independent and mutually insulated aluminum sheets 33 connected to the first housing 11 and the second housing 21 respectively, preventing voltage increases in the first housing 11 and the second housing 21 due to series connection, which could lead to electrolyte decomposition and affect the performance of the battery assembly 100. It should be noted that the boss portion 315 can be provided only on the first side 311 or only on the second side 312.

[0058] Combination Figure 5 In some optional embodiments, the boss portion 315 includes a transition unit 3152 and a lug unit 3151. The transition unit 3152 is disposed between the lug unit 3151 and the body portion 314. The projected area of ​​the transition unit 3152 in the thickness direction X is smaller than the projected area of ​​the lug unit 3151 in the thickness direction X. The aluminum sheet 33 is disposed around the transition unit 3152 and is engaged between the lug unit 3151 and the body portion 314. The insulating plate 34 abuts against the lug unit 3151. By providing the lug unit 3151, the position of the aluminum sheet 33 in the thickness direction X can be restricted, preventing displacement of the aluminum sheet 33 caused by bumps during vehicle operation. Since the insulating plate 34 abuts against the lug unit 3151, the insulating plate 34 and the boss portion 315 can further isolate the aluminum sheet 33 and the intermediate pole post 32, thereby achieving effective insulation.

[0059] It should be noted that the electrode opening 341 may expose only the middle electrode 32, without exposing the light aluminum sheet 33. Or, as... Figure 3 As shown, the terminal opening 341 can expose the intermediate terminal 32 and the exposed portion of the light aluminum sheet 33, thereby ensuring that the intermediate terminal 32 can be fully exposed, ensuring the contact area between the intermediate terminal 32 and the tabs of the first battery 1 and the second battery 2, and thus ensuring the overcurrent capacity.

[0060] Back Figure 3 and Figure 4 In some optional embodiments, the boss portion 315 includes a limiting protrusion 3153 extending along the thickness direction X. The limiting protrusion 3153 is disposed on the side of the boss portion 315 away from the body portion 314. The insulating plate 34 includes a limiting hole 342. The limiting protrusion 3153 is received in the limiting hole 342. With this arrangement, the limiting protrusion 3153 can restrict the translational movement of the insulating plate 34 in the length direction Y or the width direction Z, and to a certain extent, it plays a role in fixing the insulating plate 34. Figure 4In the illustrated embodiment, the boss portion 315 on one side includes two limiting protrusions 3153. The limiting protrusions 3153 are distributed along the length direction Y. The two limiting protrusions 3153 can restrict the translational movement of the insulating plate 34 perpendicular to the thickness direction X, further restricting the position of the insulating plate 34.

[0061] Optionally, the insulating plate 34 includes a flange 343 extending toward the body portion 314. The flange 343 is disposed around the boss portion 315. The flange 343 abuts against the aluminum sheet 33. The flange 343 provides support for forces in the thickness direction X around the periphery of the insulating plate 34, enabling the intermediate cover plate 3 to effectively transmit forces between the first housing 11 and the second housing 21, and reducing the probability of damage to the insulating plate 34 due to forces in the thickness direction X during assembly.

[0062] like Figure 3 As shown, the dimension of the intermediate insulating member 31 in the length direction Y is larger than its dimension in the width direction Z. In some optional embodiments, the ratio of the dimension L2 of the intermediate terminal 32 to the dimension L1 of the intermediate insulating member 31 in the length direction Y is greater than or equal to 0.65 and less than or equal to 0.8. For example, the dimension ratio can be any value between 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80. Increasing the dimension of the intermediate terminal 32 in the length direction Y can effectively increase the cross-sectional area of ​​the intermediate terminal 32, thereby improving the current carrying capacity of the intermediate terminal 32 and improving the safety of the battery assembly 100. If the size of the intermediate terminal 32 is too large, it can easily reduce the strength of the intermediate cover plate 3, which in turn can lead to damage during the assembly and use of the battery assembly 100. Therefore, the intermediate terminal 32 within this range can better balance the current carrying capacity of the intermediate terminal 32 and the structural strength of the intermediate cover plate 3.

[0063] Similarly, in the width direction Z, the ratio of the dimension D1 of the intermediate pole 32 to the dimension D2 of the intermediate insulating member 31 is greater than or equal to 0.7 and less than or equal to 0.95. For example, the dimension ratio can be any value between 0.7, 0.72, 0.74, 0.76, 0.78, 0.80, 0.82, 0.84, 0.86, 0.88, 0.90, 0.92, 0.94, and 0.95. This dimension ratio can also better balance the current-carrying capacity of the intermediate pole 32 and the structural strength of the intermediate cover plate 3. This application will not elaborate further on this.

[0064] Combination Figure 5 and Figure 6In some optional embodiments, the intermediate insulating member 31 includes an abutment boss 316 disposed on the receiving opening 313. The intermediate positive electrode 321 includes a positive electrode abutment unit 3211 disposed near the first side 311 and a positive electrode connecting unit 3212 disposed away from the first side 311. The positive electrode connecting unit 3212 connects the positive electrode abutment unit 3211 and the intermediate negative electrode 322. The positive electrode abutment unit 3211 abuts against the surface of the abutment boss 316 facing the first side 311. The intermediate negative electrode 322 includes a negative electrode abutment unit 3221 disposed near the second side 312 and a negative electrode connecting unit 3222 disposed away from the second side 312. The negative electrode connecting unit 3222 connects the negative electrode abutment unit 3221 and the intermediate positive electrode 321. The negative electrode abutment unit 3221 abuts against the surface of the abutment boss 316 facing the second side 312.

[0065] In other words, in this embodiment, the intermediate pole 32 is Figure 6 The diagram shows an "I"-shaped structure. This arrangement restricts the position of the intermediate pole 32 in the thickness direction X by the abutment boss 316, thus ensuring the structural stability of the intermediate cover plate 3. Furthermore, since the positive electrode abutment unit 3211 and the negative electrode abutment unit 3221 need to abut against the abutment boss 316, their projected areas in the thickness direction X are larger than those of the positive electrode connection unit 3212 and the negative electrode connection unit 3222. This arrangement effectively increases the flow area of ​​the intermediate pole 32 and allows it to withstand higher thrust in the thickness direction X.

[0066] In various embodiments, the intermediate negative electrode 322 and the intermediate positive electrode 321 are made of different materials. For example, the intermediate negative electrode 322 is made of copper and the intermediate positive electrode 321 is made of aluminum. The intermediate electrode post 32 can be formed by processing a copper-aluminum composite plate, or it can be formed by processing copper and aluminum separately and then connecting them together with an electrically conductive material. This application is not limited in this respect.

[0067] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An intermediate cover plate, characterized in that, The intermediate cover plate is used to connect the first battery and the second battery; the intermediate cover plate includes: An intermediate insulating member includes a first side, a second side, and a receiving opening; the first side and the second side are disposed opposite each other along the thickness direction; the receiving opening penetrates the intermediate insulating member along the thickness direction; and An intermediate electrode post, disposed in the receiving opening, includes a connected intermediate positive electrode and an intermediate negative electrode; the intermediate positive electrode protrudes from the receiving opening towards the first side; the intermediate negative electrode protrudes from the receiving opening towards the second side. The intermediate positive electrode is used to connect to the positive electrode tab of the first battery; the intermediate negative electrode is used to connect to the negative electrode tab of the second battery.

2. The intermediate cover plate according to claim 1, characterized in that, The intermediate insulating member includes a body portion and a boss portion; the boss portion is disposed on the surface of the body portion facing the first side and / or facing the second side; the intermediate cover plate further includes: An aluminum sheet is disposed around the protrusion portion and connected to the body portion; An insulating plate is disposed on the side of the aluminum sheet away from the main body; the insulating plate includes an electrode opening, and the intermediate electrode protrudes from the electrode opening.

3. The intermediate cover plate according to claim 2, characterized in that, The boss portion includes a transition unit and a lug unit; the transition unit is disposed between the lug unit and the body portion; the projected area of ​​the transition unit in the thickness direction is smaller than the projected area of ​​the lug unit in the thickness direction. The aluminum sheet is arranged around the transition unit and is engaged between the lug unit and the main body; the insulating plate abuts against the lug unit.

4. The intermediate cover plate according to claim 2, characterized in that, The boss portion includes a limiting protrusion extending along the thickness direction; the limiting protrusion is disposed on the side of the boss portion away from the body portion; the insulating plate includes a limiting hole; the limiting protrusion is received in the limiting hole; And / or, The insulating plate includes a flange extending toward the body portion; the flange is disposed around the boss portion; the flange abuts against the aluminum sheet.

5. The intermediate cover plate according to claim 1, characterized in that, The intermediate insulating member includes an abutting boss disposed in the receiving opening; The intermediate positive electrode includes a positive electrode abutting unit disposed near the first side and a positive electrode connecting unit disposed away from the first side; the positive electrode connecting unit connects the positive electrode abutting unit and the intermediate negative electrode; the positive electrode abutting unit abuts against the surface of the abutting protrusion facing the first side; and / or, the intermediate negative electrode includes a negative electrode abutting unit disposed near the second side and a negative electrode connecting unit disposed away from the second side; the negative electrode connecting unit connects the negative electrode abutting unit and the intermediate positive electrode; the negative electrode abutting unit abuts against the surface of the abutting protrusion facing the second side.

6. The intermediate cover plate according to claim 1, characterized in that, The intermediate insulating member has a larger dimension in the length direction than its dimension in the width direction; the length direction and the width direction are respectively perpendicular to the thickness direction; wherein... In the length direction, the ratio of the size of the intermediate pole to the size of the intermediate insulator is greater than or equal to 0.65 and less than or equal to 0.8; and / or, in the width direction, the ratio of the size of the intermediate pole to the size of the intermediate insulator is greater than or equal to 0.7 and less than or equal to 0.

95.

7. A battery assembly, characterized in that, include: The first battery includes a first casing, a first cell, and a negative electrode cover plate; the first casing houses the first cell; the first cell includes a first positive electrode tab and a first negative electrode tab; the negative electrode cover plate is connected to one side of the first casing and communicates with the first negative electrode tab. A second battery includes a second housing, a second battery cell, and a positive electrode cover. The second housing contains the second battery cell. The second battery cell includes a second positive electrode tab and a second negative electrode tab. The positive electrode cover is connected to one side of the second housing and communicates with the second positive electrode tab. The intermediate cover plate as described in any one of claims 1-6; the intermediate cover plate is connected to the first housing and the second housing along the thickness direction; wherein the intermediate positive electrode is in communication with the first positive electrode tab; and the intermediate negative electrode is in communication with the second negative electrode tab.

8. The battery assembly according to claim 7, characterized in that, The first battery includes a first explosion-proof valve; the first explosion-proof valve is disposed in the first housing; and / or, The second battery includes a second explosion-proof valve; the second explosion-proof valve is disposed in the second housing; and / or; The dimension of the battery assembly in the thickness direction is greater than or equal to 600 mm.

9. A battery pack, characterized in that, It includes multiple battery components as described in claim 7 or 8; the dimension of the battery component in the length direction is greater than the dimension of the battery component in the width direction; the length direction and the width direction are respectively perpendicular to the thickness direction; the multiple battery components are arranged along the width direction and are electrically conductive.

10. A vehicle, characterized in that, Includes the battery pack as described in claim 9.

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