Connecting assembly, battery and vehicle

Abstract

The embodiment of the utility model provides a connecting assembly, a battery and a vehicle, the connecting assembly comprises a body and a pole, the body is used for being connected with two shells and closing two single batteries, one side of the body is used for being connected with a positive pole lug of one battery cell, and the other side of the body is used for being connected with a negative pole lug of the other battery cell. One side of the body is used for being connected with a positive pole lug of one adjacent battery cell, the other side of the body is used for being connected with a negative pole lug of another adjacent battery cell, a through hole is formed in the body, the pole column is arranged in the through hole in a penetrating mode, and the two ends of the pole column are electrically connected with the positive pole lug and the negative pole lug respectively. In addition, the pole in the connecting assembly is arranged in the through hole of the body in a penetrating manner, and the two ends of the pole are directly and electrically connected with the positive and negative tabs, so that the transmission path and contact resistance of current can be reduced, the resistance loss of the battery is reduced, and the energy conversion efficiency of the battery is improved. Moreover, the body is arranged to be connected with the two shells, so that the two single batteries can be sealed, and the battery with good sealing performance can be formed.

Description

Technical Field

[0001] The present application belongs to the technical field of battery production and manufacturing. Specifically, the present application relates to a connection component, a battery and a vehicle. Background Art

[0002] In electric vehicles, smart grid energy storage systems, and other applications with high energy density requirements, the performance and safety of power batteries are crucial. Currently, the series structure design of most power batteries is mainly concentrated at the battery pack level. That is, after completing the production of multiple battery cells, they are connected in series to form a battery pack.

[0003] Traditional series structures require the use of connecting plates, bolts and other connection structures, which not only increase costs, but may also lead to problems such as increased resistance and poor contact, thereby affecting the overall performance and safety of the battery pack. Utility Model Content

[0004] One purpose of an embodiment of the present application is to provide a new solution for connecting components, batteries and vehicles.

[0005] According to a first aspect of an embodiment of the present application, a connection assembly is provided for connecting two single cells, each of the single cells comprising a housing and a battery cell disposed in the housing, the connection assembly comprising:

[0006] The body and the pole, the body is used to connect with the two shells and enclose the two single cells, one side of the body is used to connect with the positive pole tab of one battery cell, and the other side of the body is used to connect with the negative pole tab of another battery cell, a through hole is opened on the body, the pole is penetrated in the through hole, and the two ends of the pole are respectively electrically connected to the positive pole tab and the negative pole tab.

[0007] Optionally, the through hole is opened in the middle of the body.

[0008] Optionally, the body includes a first cover plate and a second cover plate, the first cover plate is insulated from the second cover plate, the first cover plate is used to connect to one of the shells and enclose one of the single cells, the second cover plate is used to connect to another of the shells and enclose another of the single cells, and the through hole passes through the first cover plate and the second cover plate.

[0009] Optionally, the body further includes a first insulating plate, the first insulating plate is sandwiched between the first cover plate and the second cover plate, and the through hole passes through the first cover plate, the first insulating plate and the second cover plate.

[0010] Optionally, along a direction perpendicular to the connection direction of the plurality of battery cells, a size of the first insulating plate is between 0.7 times and 1 times a size of the first cover plate.

[0011] Optionally, the main body also includes a first connecting plate and a second connecting plate, the first connecting plate is located on a side of the first cover plate away from the second cover plate, the second connecting plate is located on a side of the second cover plate away from the first cover plate, and the first connecting plate and the first cover plate, as well as the second connecting plate and the second cover plate are insulated respectively, one of the first connecting plate and the second connecting plate is connected to the positive pole tab of one of the battery cells, and the other of the first connecting plate and the second connecting plate is connected to the negative pole tab of another adjacent battery cell.

[0012] Optionally, the main body further includes a second insulating plate, and the second insulating plate is provided between the first connecting plate and the first cover plate, and between the second connecting plate and the second cover plate, respectively.

[0013] Optionally, along a connection direction perpendicular to the plurality of battery cells, a size of the second insulating plate is larger than a size of the first connecting plate, and a size of the second insulating plate is smaller than a size of the first cover plate.

[0014] According to a second aspect of an embodiment of the present application, a battery is provided, comprising at least one connection assembly as described in the first aspect, the battery further comprising at least two single cells, each of the single cells comprising a shell and a battery cell disposed in the shell, the body being connected to the two shells and enclosing the two single cells.

[0015] Optionally, the shell has a containing cavity, the battery cell is located in the containing cavity, and the body is connected to the inner wall of the shell.

[0016] According to a third aspect of an embodiment of the present application, a vehicle is provided, comprising the battery described in the second aspect.

[0017] A technical effect of this application is:

[0018] The embodiment of the present application provides a connection assembly for connecting two single cells, each of which includes a shell and a battery cell disposed in the shell, and the connection assembly includes a body and a pole, the body is used to connect with the two shells and seal the two single cells, one side of the body is used to connect with the positive pole ear of one battery cell, and the other side of the body is used to connect with the negative pole ear of another battery cell, and a through hole is provided on the body, the pole is penetrated in the through hole, and the two ends of the pole are electrically connected to the positive pole ear and the negative pole ear respectively. By penetrating the pole in the connection assembly into the through hole of the body and directly connecting the two ends of the pole with the positive and negative pole ears, the transmission path and contact resistance of the current can be reduced, thereby reducing the resistance loss of the battery and improving the energy conversion efficiency of the battery. Since the pole is directly connected to the positive and negative pole ears through the through hole, the number of connection points is reduced, the risk of connection failure is reduced, and the safety of the battery is also improved. In addition, the body is set to be connected with the two shells so as to seal the two single cells, so as to form a battery with good sealing performance.

[0019] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0021] Figure 1 A schematic diagram of a battery provided in an embodiment of the present application;

[0022] Figure 2 A cross-sectional view of a battery provided in an embodiment of the present application;

[0023] Figure 3 An exploded diagram of a connection assembly provided in an embodiment of the present application;

[0024] Figure 4 A cross-sectional view of a connection assembly provided in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of a connection assembly provided in an embodiment of the present application;

[0026] Figure 6 Another schematic diagram of a connection component provided in an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 1. Battery cell; 11. Positive electrode tab; 12. Negative electrode tab; 2. Connecting assembly; 21. Main body; 211. First cover plate; 212. Second cover plate; 213. First insulating plate; 214. First connecting plate; 215. Second connecting plate; 216. Second insulating plate; 22. Post; 3. Shell; 4. End cover. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "height", "thickness", "up", "down", "front", "middle", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] like Figure 1 and Figure 2 As shown, the battery core structure provided by the embodiment of the utility model can be used to form a battery. The battery core structure can be arranged in the receiving cavity of the housing 3 and filled with electrolyte to form a battery, which can be a lithium ion battery or a sodium ion battery.

[0036] like Figure 2As shown, the connection component 2 provided in the embodiment of the utility model is used to connect two single cells, each of which includes a shell 3 and a battery cell 1 arranged in the shell 3, and the connection component 2 includes a body 21 and a pole 22, the body 21 is used to connect with the two shells 3 and enclose the two single cells, one side of the body 21 is used to connect with the positive pole ear 11 of one battery cell 1, and the other side of the body 21 is used to connect with the negative pole ear 12 of the other battery cell 1, a through hole is opened on the body 21, the pole 22 is penetrated in the through hole, and the two ends of the pole 22 are electrically connected to the positive pole ear 11 and the negative pole ear 12 respectively.

[0037] like Figure 2 As shown, the body 21 can be connected to two shells 3 and enclose two single cells. Specifically, both ends of the battery can also have end caps 4, and the two end caps 4 are respectively located at the pole ears. The two end caps 4, the first cover plate 211 and the second cover plate 212 in the body 21 are respectively welded and sealed with the inner wall of the shell 3 to form a battery.

[0038] In this embodiment, the battery may include two single cells and a connection assembly 2. One side of the body 21 is fixedly connected to the positive pole tab 11 of a battery cell 1 by welding, riveting or other suitable connection methods, and the other side of the body 21 is fixedly connected to the negative pole tab 12 of another adjacent battery cell 1 by welding, riveting or other suitable connection methods, thereby realizing the series connection of two single cells. A through hole is provided on the body 21, and the pole 22 is penetrated in the through hole. The two ends of the pole 22 are electrically connected to the positive pole tab 11 and the negative pole tab 12 respectively, so as to ensure that the current flows smoothly from one battery cell 1 to another battery cell 1.

[0039] In another embodiment, a battery may include three single cells and two connection components 2. The connection method of each connection component 2 is the same as that of the above embodiment, that is, one side of the body 21 is connected to the positive electrode tab 11 of one battery cell 1, and the other side is connected to the negative electrode tab 12 of another adjacent battery cell 1, and the pole 22 is inserted into the through hole of the body 21, so that the three single cells can be connected in series and electrically connected.

[0040] In another embodiment, more single cells can be connected in series. The connection method of each connection component 2 is the same as that of the aforementioned embodiment. By using multiple connection components 2, multiple single cells can be connected in series, so that the batteries can be flexibly combined and expanded to meet the needs of different application scenarios.

[0041] In this way, multiple single cells can be efficiently connected in series using one or more connection components 2, thereby increasing the energy density of the battery without increasing the total volume of the battery. By adjusting the number and layout of the connection components 2, the battery can be designed in a diversified manner to meet the needs of different application scenarios. For example, in a scenario where high energy density is required, the number of connection components 2 can be increased to connect more single cells in series.

[0042] Among them, the two sides of the connection component 2 body 21 are tightly connected to the positive and negative ears of the battery cell 1, which can ensure that the connection component 2 can still maintain a stable electrical connection when it runs for a long time or experiences external environmental influences such as vibration and impact, avoiding performance degradation or safety hazards caused by loose or broken connections.

[0043] In addition, the pole 22 in the connecting assembly 2 is inserted into the through hole of the main body 21, and the two ends of the pole 22 are directly electrically connected to the positive and negative pole ears, which can also reduce the current transmission path and contact resistance, thereby reducing the resistance loss of the battery and improving the energy conversion efficiency of the battery. Since the pole 22 is directly connected to the positive and negative pole ears through the through hole, the number of connection points is reduced and the risk of connection failure is also reduced. Among them, the through hole on the main body 21 can also be conveniently realized through the process, making the connection between the pole 22 and the main body 21 easier and more reliable, thereby reducing the difficulty and production time of the battery.

[0044] Optionally, the through hole is opened in the middle of the body 21.

[0045] like Figures 2 to 6 As shown, the through hole can be opened in the middle of the main body 21, which can make the structure of the connection component 2 more compact, which can not only reduce the use of materials and reduce the overall weight, but also make the battery lighter and easier to integrate and use in various devices.

[0046] In addition, the through hole opened in the middle allows the pole 22 to pass through, and the two ends are respectively connected to the positive pole ear 11 and the negative pole ear 12, which helps to evenly distribute the current inside the battery, reduces the thermal effect and potential damage risk caused by current concentration, and improves the stability and safety of the battery.

[0047] Optionally, the main body 21 includes a first cover plate 211 and a second cover plate 212, the first cover plate 211 and the second cover plate 212 are insulated, the first cover plate 211 is used to connect to one of the shells 3 and enclose one of the single cells, the second cover plate 212 is used to connect to another of the shells 3 and enclose another of the single cells, and the through hole passes through the first cover plate 211 and the second cover plate 212.

[0048] Specifically, the first cover plate 211 and the second cover plate 212 are used to form connections with the inner wall of the housing 3 respectively, so as to connect the body 21 with the housing 3. The insulation design between the first cover plate 211 and the second cover plate 212 ensures that no accidental electrical contact occurs between the positive and negative electrodes of the connection assembly 2, thereby avoiding short circuits and possible damage risks. This design significantly improves the safety performance of the battery and reduces the possibility of safety accidents caused by electrical failures.

[0049] In addition, the design of the first cover plate 211 and the second cover plate 212 can also increase the overall strength of the connection component 2, so that the connection component 2 can maintain stable performance when subjected to external impact or vibration, thereby improving the reliability and durability of the connection component 2.

[0050] Optionally, the body 21 further includes a first insulating plate 213 , which is sandwiched between the first cover plate 211 and the second cover plate 212 , and the through hole passes through the first cover plate 211 , the first insulating plate 213 and the second cover plate 212 .

[0051] like Figures 2 to 4 As shown, the first insulating plate 213 can provide an electrical isolation layer between the first cover plate 211 and the second cover plate 212, which can reduce the risk of accidental electrical contact between the positive and negative electrodes, and greatly enhance the safety performance of the connection component 2. The first insulating plate 213 is usually made of a material with high thermal resistance, which helps to form a thermal isolation layer inside the connection component 2 to prevent heat from being transferred to other parts of the connection component 2 too quickly.

[0052] In addition, the first insulating plate 213 can also serve as a structural support layer, enhancing the overall structural stability of the connection component 2, and helping to prevent the first cover plate 211 and the second cover plate 212 from deforming or displacing when subjected to external pressure or vibration, thereby maintaining the stability and reliability of the connection component 2.

[0053] Optionally, along a direction perpendicular to the connection direction of the plurality of battery cells 1 , a size L4 of the first insulating plate 213 is between 0.7 times and 1 times a size L3 of the first cover plate 211 .

[0054] Specifically, by setting the size of the first insulating plate 213 to between 0.7 times and 1 times the size of the first cover plate 211 and the second cover plate 212, sufficient electrical isolation space can be ensured to effectively prevent accidental contact between the positive and negative electrodes, thereby significantly improving the safety of the connecting component 2 while avoiding the first insulating plate 213 being too large to affect the connection between the first cover plate 211 and the second cover plate 212 and the shell 3, making the battery easier to manufacture and assemble, reducing production costs, improving production efficiency, and reducing errors and defects that may occur during the manufacturing and assembly process.

[0055] In addition, by limiting the size of the first insulating plate 213, it also helps to maintain the compactness of the connection assembly 2. This reduces the volume and weight of the connection assembly 2, making it easier to integrate in a device.

[0056] Optionally, the main body 21 also includes a first connecting plate 214 and a second connecting plate 215, the first connecting plate 214 is located on a side of the first cover plate 211 away from the second cover plate 212, the second connecting plate 215 is located on a side of the second cover plate 212 away from the first cover plate 211, and the first connecting plate 214 and the first cover plate 211, as well as the second connecting plate 215 and the second cover plate 212 are insulated respectively, one of the first connecting plate 214 and the second connecting plate 215 is connected to the positive pole ear 11 of one of the battery cells 1, and the other of the first connecting plate 214 and the second connecting plate 215 is connected to the negative pole ear 12 of another adjacent battery cell 1.

[0057] like Figures 2 to 4 As shown, the first connecting plate 214 and the second connecting plate 215 are used to connect to the relative pole ears respectively, for example, the first connecting plate 214 is connected to the negative pole ear 12 of one battery cell 1, and the second connecting plate 215 is connected to the positive pole ear 11 of another battery cell 1, thereby optimizing the current path, reducing the current transmission distance inside the battery, reducing the internal resistance, and improving the energy conversion efficiency of the battery.

[0058] In addition, by designing the first connecting plate 214 and the second connecting plate 215 to connect the tabs, the use of external connectors can be eliminated, the integration of the battery is improved, the assembly process of the battery is simplified, and the production efficiency is improved.

[0059] In addition, insulation is provided between the first connecting plate 214 and the first cover plate 211, and between the second connecting plate 215 and the second cover plate 212, which can further enhance the electrical isolation performance of the connecting component 2, prevent current from flowing on unnecessary paths, reduce the risk of short circuit, and improve the safety of the battery.

[0060] In one embodiment, when the power battery formed by the battery is a sodium ion battery, the pole 22 can be made of pure aluminum or aluminum alloy, and the first connecting plate 214 and the second connecting plate 215 can be made of pure aluminum or aluminum alloy accordingly.

[0061] In another embodiment, when the power battery formed by the battery is a lithium-ion battery, the pole 22 may be a copper-aluminum composite material, the first connecting plate 214 may be made of aluminum or aluminum alloy or pure copper, and the second connecting plate 215 may be made of pure copper or aluminum or aluminum alloy. When the first connecting plate 214 is made of aluminum or aluminum alloy, the first connecting plate 214 is connected to the aluminum end of the pole 22, and the second connecting plate 215 is made of pure copper, and the second connecting plate 215 is connected to the copper end of the pole 22, and vice versa.

[0062] Optionally, the body 21 further includes a second insulating plate 216 , and the second insulating plates 216 are respectively provided between the first connecting plate 214 and the first cover plate 211 , and between the second connecting plate 215 and the second cover plate 212 .

[0063] Specifically, the second insulating plate 216 can provide an electrical isolation layer between the first connecting plate 214 and the first cover plate 211, and between the second connecting plate 215 and the second cover plate 212, which can further reduce the risk of short circuit caused by accidental contact and significantly enhance the safety performance of the battery. Even under extreme conditions, such as vibration or impact, it can effectively prevent the occurrence of electrical connection failure or short circuit.

[0064] The second insulating plate 216 can also play a certain structural support role, which helps to enhance the connection strength between the connecting plate and the cover plate, and improves the overall stability of the battery. During long-term use, this design can maintain the stability and reliability of the battery and reduce performance degradation caused by structural deformation or looseness.

[0065] Optionally, along a connection direction perpendicular to the plurality of battery cells 1 , a size L2 of the second insulating plate 216 is larger than a size L1 of the first connecting plate 214 , and a size L2 of the second insulating plate 216 is smaller than a size L3 of the first cover plate 211 .

[0066] like Figure 6 As shown, the size L2 of the second insulating plate 216 is set between the size L1 of the first connecting plate 214 and the size L3 of the first cover plate 211. While the first connecting plate 214 can be fully isolated by the second insulating plate 216, the connection between the first cover plate 211 and the shell 3 can be prevented from being affected by the excessive size of the second insulating plate 216.

[0067] The utility model also provides a battery, comprising at least one of the above-mentioned connecting components 2, the battery also comprising at least two single cells, each of the single cells comprising a shell 3 and a battery cell 1 arranged in the shell 3, the body 21 is connected to the two shells 3 and encloses the two single cells.

[0068] Optionally, the shell 3 has a containing cavity, the battery cell 1 is located in the containing cavity, and the body 21 is connected to the inner wall of the shell 3 .

[0069] like Figure 1 and Figure 2 As shown, the battery cell 1 is arranged in the accommodating cavity, and the accommodating cavity can be used to protect the battery cell 1, and the body 21 is connected to the inner wall of the shell 3, so as to realize the assembly of the connection component 2 and the shell 3. Specifically, the two ends of the battery are also provided with end caps 4, and the two end caps 4 are respectively located at the pole ears, and the two end caps 4, the first cover plate 211 and the second cover plate 212 are respectively welded and sealed with the inner wall of the shell 3, so as to form a battery.

[0070] In addition, for batteries with a long length, the length of the battery can be increased by increasing the number of connecting components 2. This can effectively reduce the impedance at both ends of the single battery and the temperature of the tabs at both ends during fast charging, improve the fast charging performance, shorten the overall length of the battery shell, and reduce the manufacturing difficulty and manufacturing cost of the structural parts and batteries.

[0071] The utility model also provides a vehicle, comprising the battery mentioned above.

[0072] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A connection assembly (2) for connecting two single cells, each of the single cells comprising a housing (3) and a battery cell (1) arranged in the housing (3), characterized in that: The connection component (2) comprises: A body (21) and a pole (22), wherein the body (21) is used to connect with the two shells (3) and to enclose the two single cells, one side of the body (21) is used to connect with the positive pole ear (11) of one battery cell (1), and the other side of the body (21) is used to connect with the negative pole ear (12) of another battery cell (1), a through hole is provided on the body (21), the pole (22) is inserted into the through hole, and the two ends of the pole (22) are respectively electrically connected with the positive pole ear (11) and the negative pole ear (12).

2. The connection assembly (2) according to claim 1, characterized in that The through hole is provided in the middle of the body (21).

3. The connection assembly (2) according to claim 1, characterized in that The body (21) comprises a first cover plate (211) and a second cover plate (212), wherein the first cover plate (211) and the second cover plate (212) are insulated from each other, the first cover plate (211) is used to connect to one of the shells (3) and to enclose one of the single cells, the second cover plate (212) is used to connect to another of the shells (3) and to enclose another of the single cells, and the through hole passes through the first cover plate (211) and the second cover plate (212).

4. The connection assembly (2) according to claim 3, characterized in that The body (21) further comprises a first insulating plate (213), wherein the first insulating plate (213) is sandwiched between the first cover plate (211) and the second cover plate (212), and the through hole passes through the first cover plate (211), the first insulating plate (213) and the second cover plate (212).

5. The connection assembly (2) according to claim 4, characterized in that Along a direction perpendicular to the connection direction of the plurality of battery cells (1), the size of the first insulating plate (213) is between 0.7 times and 1 times the size of the first cover plate (211).

6. The connection assembly (2) according to claim 3, characterized in that The body (21) further comprises a first connecting plate (214) and a second connecting plate (215), wherein the first connecting plate (214) is located on a side of the first cover plate (211) away from the second cover plate (212), and the second connecting plate (215) is located on a side of the second cover plate (212) away from the first cover plate (211), and the first connecting plate (214) and the first cover plate (211), as well as the second connecting plate (215) and the second cover plate (212) are insulated from each other, one of the first connecting plate (214) and the second connecting plate (215) is connected to a positive electrode tab (11) of one of the battery cells (1), and the other of the first connecting plate (214) and the second connecting plate (215) is connected to a negative electrode tab (12) of another adjacent battery cell (1).

7. The connection assembly (2) according to claim 6, characterized in that The body (21) further comprises a second insulating plate (216), and the second insulating plate (216) is respectively provided between the first connecting plate (214) and the first cover plate (211), and between the second connecting plate (215) and the second cover plate (212).

8. The connection assembly (2) according to claim 7, characterized in that Along a connection direction perpendicular to the plurality of battery cells (1), the size of the second insulating plate (216) is larger than the size of the first connecting plate (214), and the size of the second insulating plate (216) is smaller than the size of the first cover plate (211).

9. A battery, characterized in that: The battery comprises at least one connection assembly (2) as claimed in any one of claims 1 to 8, wherein the battery further comprises at least two single cells, each of the single cells comprises a shell (3) and a battery cell (1) arranged in the shell (3), and the main body (21) is connected to the two shells (3) and encloses the two single cells.

10. The battery according to claim 9, characterized in that The shell (3) has a containing cavity inside, the battery core (1) is located in the containing cavity, and the body (21) is connected to the inner wall of the shell (3).

11. A vehicle, characterized in that: A battery comprising the battery of claim 9 or claim 10.

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