Battery unit, battery module, and vehicle

Abstract

A battery unit, a battery module, and a vehicle are disclosed. The battery unit includes a housing (20), an electrode body (10), a first post (41), and a second post (42). A chamber (21) is defined within the housing, and the electrode body is disposed in the chamber and includes a first tab (11) and a second tab (12), one of the first tab (11) and the second tab (12) is a positive electrode tab, and the other of the first tab and the second tab is a negative electrode tab, the positive electrode tab is electrically connected to the housing (20), and one end of the first tab and / or the second tab away from the electrode body has a plurality of connection parts distributed at intervals, and the first post (41) is electrically connected to the first tab (11), and the second post (42) is electrically connected to the second tab (12).

Description

Technical Field

[0005] ,

[0001] This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China on December 21, 2021, with the application number 202123237116.1 and the invention title "Battery Unit, Battery Module and Vehicle", and all its contents are incorporated herein by reference.

[0002] This application relates to the technical field of batteries, and more specifically, to a battery unit, a battery module applying the battery unit, and a vehicle including the battery module.

Background Art

[0003] A battery generally includes an aluminum housing and cells mounted inside the aluminum housing. The aluminum housing is usually not charged. Along with the internal reaction of the battery, lithium reacts with the aluminum housing during the reaction, and lithium ions are embedded in the aluminum to form an aluminum-lithium alloy, causing corrosion of the aluminum housing and affecting the service life of the battery.The aluminum housing is usually not charged. Along with the internal reaction of the battery, lithium reacts with the aluminum housing during the reaction, and lithium ions are embedded in the aluminum to form an aluminum-lithium alloy, causing corrosion of the aluminum housing and affecting the service life of the battery.

[0004] Also, in the prior art, usually, the positive tab and the negative tab are designed as an integral structure respectively and provided on the short axes provided on two opposite sides respectively. In the positive cover plate in the prior art, current is passed through the post cover plate through the entire aluminum housing, and the DC impedance in this case includes the resistance of the aluminum housing. Also, the impedance of the positive tab and the negative tab is large.

Summary of the Invention

[0006] In one embodiment of the present invention, the electrode body has a long axis and a short axis, the first tab is provided on the long axis or the short axis, and the second tab is provided on the long axis or the short axis.

[0007] In one embodiment of the present invention, the electrode body has two long axes and two short axes on opposite sides, the first tab is provided on one of the long axes, the second tab is provided on the other long axis, one of the first and second posts is a positive electrode post, the other of the first and second electrode posts is a negative electrode post, and both the positive electrode post and the negative electrode post are provided on one of the short axes.

[0008] In one embodiment of the present invention, the battery unit further includes a positive electrode lead tab, the positive electrode lead tab being connected to and electrically connected to the positive electrode tab and the positive electrode post, respectively.

[0009] In one embodiment of the present invention, the positive electrode tab is a bent member having an opening groove, and the battery unit further includes a first insulating side plate, the first insulating side plate being provided in the opening groove such that at least a portion of the positive electrode tab is located between the first insulating side plate and the positive electrode lead tab.

[0010] In one embodiment of the present invention, the first insulating side plate and the electrode body are connected by an adhesive layer.

[0011] In one embodiment of the present invention, the battery unit further includes a post cover plate, the post cover plate is provided on one of the short axes, the post cover plate is provided with the positive electrode post and the negative electrode post, and the post cover plate is connected to and electrically connected to the housing and the positive electrode lead tab, respectively.

[0012] In one embodiment of the present invention, the battery unit further includes an aluminum cover plate, the aluminum cover plate is provided on the post cover plate and is electrically connected to the housing, one end of the positive electrode lead tab is connected to the aluminum cover plate, and the aluminum cover plate is electrically connected to the positive electrode post.

[0013] In one embodiment of the present invention, the positive electrode lead tab extends along the longitudinal axis.

[0014] In one embodiment of the present invention, the battery unit further includes a negative electrode lead tab, the negative electrode lead tab being connected to and electrically connected to the negative electrode tab and the negative electrode post, respectively.

[0015] In one embodiment of the present invention, the negative electrode tab is a bent member having an opening groove, and the battery unit further includes a second insulating side plate and a third insulating side plate, wherein the second insulating side plate is provided in the opening groove such that at least a portion of the negative electrode tab is located between the second insulating side plate and the negative electrode pull-out tab, and the third insulating side plate is provided on one of the short axes and located between the negative electrode pull-out tab and the electrode body such that the negative electrode pull-out tab and the electrode body are insulated.

[0016] In one embodiment of the present invention, the negative electrode lead tab includes a first body and a second body, the first body extending along the long axis and connected to the negative electrode tab, and the second body extending along the short axis and connected to the first body, the third insulating side plate and the negative electrode post, respectively.

[0017] In one embodiment of the present invention, the plurality of connecting portions are distributed at intervals along the extending longitudinal axis.

[0018] In one embodiment of the present invention, the multiple connection parts are connected in series.

[0019] In one embodiment of the present invention, the battery unit further includes an explosion-proof valve cover plate, the explosion-proof valve cover plate being provided on the short axis and located on both sides of the post cover plate and the long axis.

[0020] In one embodiment of the present invention, the size of the long axis is larger than the size of the short axis.

[0021] For another purpose of the present application, a battery module is provided, which includes a battery unit as described in any of the above embodiments.

[0022] For yet another purpose of the present application, a vehicle is provided which includes the battery module described in any of the above embodiments.

[0023] Other features and advantages of the present invention will become clearer by describing exemplary embodiments of the present invention in detail with reference to the drawings below. [Brief explanation of the drawing]

[0024] The drawings incorporated into the specification and forming part of the specification illustrate embodiments of the present application, and together with their descriptions, interpret the principles of the present application.

[0025] [Figure 1] This is a schematic diagram of the battery according to an embodiment of the present invention. [Figure 2]It is an exploded view of a battery according to an embodiment of the present application. [Figure 3] It is a partial schematic configuration diagram of an electrode body according to an embodiment of the present application. [Figure 4] It is a schematic diagram of the connection between the first tab of the electrode body and the positive electrode lead tab according to an embodiment of the present application.

Embodiments for Carrying Out the Invention

[0026] Hereinafter, various exemplary embodiments of the present application will be described in detail while referring to the drawings. Unless otherwise specified, the relative arrangements of the members and steps described in these embodiments, numerical expressions, and numerical values do not limit the scope of the present application.

[0027] The following description of at least one exemplary embodiment is essentially only exemplary and is never intended to limit the present application or its application or use.

[0028] Although the techniques, methods, and devices known to those skilled in the art have not been examined in detail, when appropriate, the above techniques, methods, and devices should be regarded as part of the specification.

[0029] In all the examples shown and examined here, any specific value should be construed as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0030] In addition, since similar reference numerals and letters represent similar elements in the following drawings, once an element is defined in one drawing, it does not need to be further examined in subsequent drawings.

[0031] One object of the present application is to provide a new technical means for a battery unit that can solve the problems in the prior art that the housing is easily corroded and the battery impedance is large.

[0032] Another object of this application is to provide a novel technical means for a battery module including the above-mentioned battery unit.

[0033] Another objective of this application is to provide a new technical means for a vehicle including the battery module described above.

[0034] According to the embodiments of the present invention, by electrically connecting the positive electrode tab to the housing, the housing can be charged and corrosion of the housing can be avoided. By having the first tab and / or the second tab include multiple connection points, the current path can be optimized and the DC impedance of the electrode body can be reduced.

[0035] The battery unit 100 according to the embodiment of the present application will be described in detail below with reference to the drawings.

[0036] As shown in Figures 1 to 4, the battery unit 100 according to the embodiment of the present application includes a housing 20, an electrode body 10, a first post 41, and a second post 42.

[0037] Specifically, a chamber 21 is defined within the housing 20, and the electrode body 10 is provided in the chamber 21 and includes at least one first tab 11 and at least one second tab 12, one of the first tab 11 and the second tab 12 being a positive electrode tab, and the other of the first tab 11 and the second tab 12 being a negative electrode tab, the positive electrode tab is electrically connected to the housing 20, and the end of the first tab 11 and / or the second tab 12 away from the electrode body 10 each has a plurality of spaced-apart connection points, the first post 41 is electrically connected to the first tab 11 and the second post 42 is electrically connected to the second tab 12.

[0038] In other words, the battery unit 100 according to the embodiment of the present application mainly consists of a housing 20, an electrode body 10, a first post 41, and a second post 42. A chamber 21 is formed inside the housing 20, and the chamber 21 has a housing function, and the electrode body 10 is mounted inside the chamber 21. The electrode body 10 has a first tab 11 and a second tab 12. The first tab 11 and the second tab 12 have opposite polarities; when the first tab 11 is the positive electrode tab, the second tab 12 is the negative electrode tab, and when the first tab 11 is the negative electrode tab, the second tab 12 is the positive electrode tab.

[0039] When the positive electrode tab is electrically connected to the housing 20, the housing 20 and the positive electrode can have the same voltage, which corresponds to the housing 20 being positively charged, and the voltage increases. For example, if the housing 20 is an aluminum housing, and the voltage of the aluminum housing increases, and lithium does not react with the high-voltage aluminum housing during the reaction, the aluminum housing will not be charged or a negative voltage will be generated, then lithium ions will become embedded in the aluminum to form an aluminum-lithium alloy, causing corrosion of the aluminum housing.

[0040] The end of the first tab 11 and / or the second tab 12 that is not attached to the electrode body 10 each includes a plurality of connection points that are spaced apart. That is, at least one of the positive electrode tab and the negative electrode tab includes a plurality of connection points, and the plurality of connection points are spaced apart. For the sake of explanation, the connection point corresponding to the first tab 11 can be defined as the first connection point 111, and the connection point corresponding to the second tab 12 can be defined as the second connection point 121.

[0041] The electrode body 10 of the present invention may mainly consist of a first electrode plate, a first tab 11, a second electrode plate, a second tab 12, and a separator, wherein the first electrode plate is provided with the first tab 11, the second electrode plate is provided with the second tab 12, and a separator is provided between the first electrode plate and the second electrode plate.

[0042] When one end of the first tab 11 or the second tab 12, which is close to the housing 20 but away from the electrode body 10, includes multiple connection points distributed at intervals, there are several possible cases, and the first tab 11 will be described below as an example.

[0043] Case 1 The first tab 11 has a first end connected to a first pole plate, and a second end having a plurality of first connecting portions 111, with a partition groove between two adjacent first connecting portions 111. In other words, the first tab 11 has a one-piece structure at the first end and a partition structure at the second end.

[0044] Case 2 The first tab 11 is divided into multiple first connection portions 111, with two adjacent first connection portions 111 spaced apart, and one end of each first connection portion 111 is directly connected to the first electrode plate.

[0045] In both case 1 and case 2, the first tab 11 of this application has a lower DC impedance (DCR) compared to the integrated first tab 11 in the prior art, and can reduce the DCR of the electrode body 10. Similarly, the second tab 12 can also have its DCR reduced by using multiple second connection parts 121, but this will not be explained here. Furthermore, the first tab 11 and the second tab 12 have opposite polarities, and whether the first tab 11 is a positive or negative electrode tab, the end of the first tab 11 away from the first electrode plate can be divided into multiple connection parts.

[0046] The battery unit 100 further includes a first post 41 and a second post 42, and the first post 41 is electrically connected to the first tab 11 and the second post 42 is electrically connected to the second tab 12, thereby performing a coupling function. The positive electrode post is connected to the positive electrode tab, the negative electrode post is connected to the negative electrode tab, and the positive electrode post may be electrically connected to the positive electrode tab by the housing 20.

[0047] As a result, according to the battery unit 100 of the embodiment of the present application, the housing 20 can be charged by electrically connecting the positive electrode tab to the housing 20, thereby preventing corrosion of the housing 20. By having the first tab 11 and / or the second tab 12 include multiple connection points, the current path can be optimized and the DC impedance of the electrode body 10 can be reduced.

[0048] In the embodiments of the present application, the electrode body 10 has a major axis and a minor axis, the first tab 11 is provided on either the major axis or the minor axis, and the second tab 12 is provided on either the major axis or the minor axis. When the first tab 11 is provided on the major axis, the second tab 12 may be provided on either the major axis or the minor axis, and when the first tab 11 is provided on the minor axis, the second tab 12 may be provided on either the major axis or the minor axis. For example, the electrode body 10 is a substantially rectangular member, having a major axis (i.e., the long side of the rectangle) and a minor axis (i.e., the short side of the rectangle), the major axis extending along a first direction, the minor axis extending along a second direction, and the first direction being provided substantially perpendicular to the second direction.

[0049] In some specific embodiments of the present application, as shown in Figure 3, the electrode body 10 has two long axes and two short axes on opposite sides, the first tab 11 is provided on one long axis, the second tab 12 is provided on the other long axis, one of the first post 41 and the second post 42 is a positive electrode post, and the other of the first post 41 and the second post 42 is a negative electrode post, both of which are provided on the short axes. That is, the positive electrode tab and the negative electrode tab are provided on the long axes and located on opposite sides of the short axis.

[0050] If the positive electrode tab is provided on the long axis and the size of the long axis is larger than the size of the short axis, the impedance reduction requirement of the electrode body 10 in the first direction is greater than the impedance reduction requirement of the electrode body 10 in the second direction. Therefore, if the first tab 11 is provided on the long axis, the impedance reduction effect in the first direction can be guaranteed. Furthermore, the size of the short axis is limited, and especially in the case of a blade battery, it is advantageous that the first tab 11 can be provided in the direction of the long axis. That is, by providing multiple connection points on the longitudinal side surface of the electrode body 10, it is advantageous to reduce the overall resistance of the electrode body 10, and is especially advantageous in the case of a long blade battery. Similarly, by providing the negative electrode tab on the long axis and ensuring that the negative electrode tab includes multiple connection points, the impedance reduction effect can be further improved.

[0051] Compared to the conventional technique of providing positive and negative electrode tabs on two opposite short axes, the conventional positive electrode cover plate allows current to flow through the entire aluminum housing to the post cover plate 40, and in this case the DCR includes the resistance of the aluminum housing. In the present invention, the positive electrode current reaches the positive electrode post from the side, and the DCR of the aluminum housing can be reduced.

[0052] In the embodiment of the present invention, as shown in Figure 4, the battery unit 100 further includes a positive electrode lead tab 70, which is connected to and electrically connected to the positive electrode tab and the positive electrode post, respectively. For example, the first end of the positive electrode lead tab 70 is connected to the connection portion of the positive electrode tab, and the second end is connected to the positive electrode post. In this embodiment, the positive electrode lead tab 70 enables the electrical connection between the positive electrode tab and the positive electrode post. The positive electrode lead tab 70 may be made of aluminum and may be welded to the positive electrode tab.

[0053] In the embodiment of the present application, as shown in FIG. 2, the positive electrode tab is a bent member having a first opening groove 112, and the battery unit 100 further includes a first insulating side plate 30. The first insulating side plate 30 is provided in the first opening groove 112 such that at least a part of the positive electrode tab is located between the first insulating side plate 30 and the positive electrode lead tab 70. That is, when assembling the battery unit 100, the positive electrode tab can be bent. In this case, the positive electrode tab is formed in a substantially "匚" shape, and the "匚" shape has the first opening groove 112, or the positive electrode tab is formed in a substantially "￢" shape, and the positive electrode tab is engaged with other members of the electrode body 10 to form the first opening groove 112.

[0054] In this embodiment, since the first insulating side plate 30 is provided on the positive electrode tab, the first insulating side plate 30 has a supporting effect on the positive electrode tab after the positive electrode tab is folded. That is, by using the first insulating side plate 30, it is possible to prevent the positive electrode tab from being excessively pressed by the positive electrode lead tab 70, so that the safety performance of the battery unit 100 is improved.

[0055] In the embodiment of the present application, the first insulating side plate 30 and the electrode body 10 are connected by an adhesive layer. That is, the first insulating side plate 30 may be fixed to the electrode body 10 by a tape, and it is possible to prevent the electrode body 10 from moving inside the battery unit 100.

[0056] In some specific embodiments of the present application, as shown in FIG. 2, the battery unit 100 further includes a post cover plate 40. The post cover plate 40 is provided on the short axis, and a positive electrode post and a negative electrode post are provided on the post cover plate 40. The post cover plate 40 is respectively connected to and electrically connected to the housing 20 and the positive electrode lead tab 70. That is, both the positive electrode post and the negative electrode post are attached to the post cover plate 40, which is advantageous for processing and production. In addition, by providing a positive electrode tab on the side surface and making the positive electrode tab have a connecting portion, the current of the positive electrode can directly reach the post cover plate 40 from the side surface, and the DCR of the housing 20 is reduced.

[0057] According to the embodiment of the present invention, as shown in Figure 4, the extension of the positive electrode lead tab 70 along the long axis is advantageous for connecting the positive electrode lead tab 70 to the positive electrode post, not only shortening the required length of the positive electrode lead tab 70, but also for connecting the positive electrode lead tab 70 to a positive electrode tab that similarly extends along the long axis.

[0058] In some specific embodiments of the present invention, the battery unit 100 further includes an aluminum cover plate 43, which is provided on the post cover plate 40 and electrically connected to the housing 20, the second end of the positive electrode lead tab 70 is connected to the aluminum cover plate 43, and the aluminum cover plate 43 is electrically connected to the positive electrode post. During production, the positive electrode lead tab 70 is welded to the positive electrode tab and then welded to the aluminum cover plate 43 to communicate with the positive electrode post.

[0059] In the embodiment of the present invention, as shown in Figure 4, the battery unit 100 further includes a negative electrode lead tab 90, which is connected to and electrically connected to the negative electrode tab and the negative electrode post, respectively. That is, the first end of the negative electrode tab may be connected to the negative electrode plate, and the second end has a plurality of connection parts, the plurality of connection parts are connected to the negative electrode lead tab 90, and the negative electrode lead tab 90 is connected to the negative electrode post to realize an electrical connection between the negative electrode plate and the negative electrode post, that is, the negative electrode lead tab 90 communicates with the negative electrode post. The negative electrode lead tab 90 may be made of copper and may be welded to the negative electrode tab.

[0060] In some specific embodiments of the present application, as shown in Figure 2, the negative electrode tab is a bent member having a second opening groove 122, and the battery unit 100 further includes a second insulating side plate 60, the second insulating side plate 60 being provided in the second opening groove 122 such that at least a portion of the negative electrode tab is positioned between the second insulating side plate 60 and the negative electrode pull-out tab 90, the second insulating side plate 60 can perform a supporting function and can prevent the negative electrode tab from being excessively pressed by the negative electrode pull-out tab 90.

[0061] In the embodiment of the present invention, the second insulating side plate 60 and the electrode body 10 are connected by an adhesive layer. That is, the second insulating side plate 60 may be fixed to the electrode body 10 with tape, which prevents the electrode body 10 from moving inside the battery unit 100.

[0062] According to an embodiment of the present invention, as shown in Figure 2, the battery unit 100 further includes a third insulating side plate 80, which is mounted on the short axis and positioned between the negative electrode lead tab 90 and the electrode body 10 so as to insulate the negative electrode lead tab 90 from the electrode body 10, thereby preventing short circuits. The third insulating side plate 80 may be an insulating film, which may be provided along the length direction of the cell, and can provide insulation to the negative electrode lead tab 90. The housing 20 includes a lower part 22 and an upper cover 23, the lower part 22 having a groove, and the lower part 22 and the upper cover 23 engaging to form a chamber 21. After covering with an insulating film, the lower part 22 may be placed over it to complete the welding of the lower part 22 and the upper cover 23.

[0063] In the embodiment of the present invention, the size of the electrode body 10 in the longitudinal direction is 700 mm to 800 mm, the size in the minor direction is approximately 100 mm, and the size of the first connection portion 111 of the positive electrode tab along the longitudinal direction is 30 mm to 50 mm. The weld seam welded to the positive electrode lead tab 70 of the first connection portion 111 is maintained at 26 mm to 46 mm, as a larger weld seam is more prone to melting. The distance between two adjacent first connection portions 111 along the longitudinal direction is maintained at 80 mm to 100 mm.

[0064] Similarly, the size of the second connection portion 121 of the negative electrode tab along its long axis is 30 mm to 50 mm. The weld seam welded to the negative electrode lead tab 90 of the second connection portion 121 is maintained at 26 mm to 46 mm. The spacing between two adjacent second connection portions 121 along the long axis is maintained at 80 mm to 100 mm. The number of second connection portions 121 may be adjusted according to the length of the battery.

[0065] By using the above design, the positive and negative electrode tabs can be drawn out from the sides of the long blade battery, thereby optimizing the current path and reducing the internal resistance of the battery.

[0066] In some specific embodiments of the present application, the positive electrode tab is welded to the positive electrode lead tab 70, and the negative electrode tab is welded to the negative electrode lead tab 90. The thickness of the positive electrode lead tab 70 and the negative electrode lead tab 90 may be maintained at 1 mm to 2 mm, which ensures welding strength and reduces the degree of deformation due to welding. The positive electrode tab conducts electricity to the positive electrode post via the positive electrode lead tab 70, and the negative electrode tab conducts electricity to the negative electrode post via the negative electrode lead tab 90, forming an electric current path.

[0067] In the embodiment of the present application, as shown in Figure 2, the negative electrode lead tab 90 includes a first body 91 and a second body 92, wherein the first body 91 extends along the long axis and is connected to the negative electrode tab, and the second body 92 extends along the short axis and is connected to the first body 91, the third insulating side plate 80 and the negative electrode post, respectively, and the first body 91 and the second body 92 can be formed by bending. During production, the negative electrode lead tab 90 may be welded to the negative electrode tab, and then the negative electrode lead tab 90 may be bent and welded to the lower surface of the post cover plate 40.

[0068] In this embodiment, by dividing the negative electrode lead tab 90 into a first body 91 and a second body 92, the negative electrode lead tab 90 can be connected not only to the negative electrode tab but also to the negative electrode post, thus not occupying much space.

[0069] In some specific embodiments of the present invention, as shown in Figure 4, the distribution of multiple connection points at intervals along the longitudinal direction is advantageous for processing and production. When the electrode body 10 is applied to a battery unit 100, distributing the multiple connection points at intervals along the first direction is advantageous not only for connecting the positive electrode lead tab 70 to the multiple connection points, but also for mounting the first insulating side plate 30 and can reduce impedance.

[0070] In the embodiment of the present invention, multiple connection parts are connected in series, and when the electrode body 10 is applied to the battery unit 100, the first tab 11 is connected to the housing 20 by the positive electrode lead tab 70 to achieve charging of the housing 20. In this embodiment, by using multiple connection parts connected in series, it is advantageous that the positive electrode lead tab 70 is electrically connected to multiple first connection parts 111. Similarly, it is advantageous that the negative electrode lead tab 90 is electrically connected to multiple second connection parts 121, but this will not be explained here.

[0071] In the embodiment of the present invention, the battery unit 100 further includes an explosion-proof valve cover plate 50, which is mounted on the short axis and is located on both sides of the long axis with respect to the post cover plate 40. The chamber 21 is enclosed by the housing 20, the post cover plate 40 and the explosion-proof valve cover plate 50, which are sealed by welding.

[0072] The battery unit 100 according to this application will be described in detail below with reference to specific embodiments.

[0073] The housing 20 includes a lower section 22 and an upper cover 23. The shape of the housing 20 matches the shape of the electrode body 10, which is a rectangular member. The electrode body 10 has a long axis and a short axis, the long axis extending horizontally and the short axis extending vertically. A positive electrode tab extends from the upper side of the electrode body 10, and the positive electrode tab has a plurality of first connection portions 111. A negative electrode tab extends from the lower side of the electrode body 10. A post cover plate 40 is provided on the left side of the lower section 22, and an explosion-proof valve cover plate 50 is provided on the right side of the lower section 22. A positive electrode post and a negative electrode post are provided on the post cover plate 40, and an aluminum cover plate 43 is also provided on the post cover plate 40.

[0074] After the assembly of the battery unit 100 is complete, the second connection portion 121 is welded to the negative electrode lead tab 90, and the first connection portion 111 is formed as a bent member, with its upper surface welded to the positive electrode lead tab 70. The current path of the battery unit 100 may be positive electrode post - aluminum cover plate 43 - positive electrode lead tab 70 - positive electrode tab - positive electrode plate - negative electrode plate - negative electrode tab - negative electrode lead tab 90 - negative electrode post.

[0075] In short, the battery unit 100 according to the embodiment of the present invention has the characteristic that the housing 20 becomes charged and conducts current, thereby reducing the internal resistance of the battery and providing a corrosion-preventive effect.

[0076] The battery module according to the embodiment of the present application includes the battery unit 100 described in any of the above embodiments. The battery unit 100 according to the embodiment of the present application extends the service life of the housing 20 and reduces battery impedance, and therefore the battery module according to the embodiment of the present application also has the above advantages, which are omitted from this explanation.

[0077] A vehicle according to an embodiment of the present invention includes a battery module of any of the above embodiments. The battery module according to an embodiment of the present invention extends the service life of the housing 20 and reduces battery impedance. Therefore, the battery module according to an embodiment of the present invention also has the above advantages, and a detailed explanation is omitted here.

[0078] While several specific embodiments of this application have been described in detail with examples, those skilled in the art should understand that these examples are for illustrative purposes only and do not limit the scope of this application. Those skilled in the art should also understand that these embodiments can be modified without departing from the scope and spirit of this application. The scope of this application is limited by the attached claims. [Explanation of Symbols]

[0079] 100 batteries 10 Electrode body 11 Tab 1 111 First connection section 112 First opening groove 12. Second Tab 121 Second connection section 122 Second Opening Groove 20 Housing 21 Chambers 22 Lower 23 Top cover 30 First insulating side plate 40 Post cover plate 41 First Post 42 Second Post 43 Aluminum cover plate 50 Explosion-proof valve cover plate 60 Second insulating side plate 70 Positive electrode pull-out tab 80 Third insulating side plate 90 Negative electrode pull-out tab 91. Main body 92 Second Main Body

Claims

1. A battery unit (100) including a housing (20), an electrode body (10), a first post (41), a second post (42), and a positive electrode lead tab (70), The housing (20) is an aluminum housing, A chamber (21) is defined within the housing (20). The electrode body (10) is provided in the chamber (21), and the electrode body (10) includes a first tab (11) and a second tab (12), one of the first tab (11) and the second tab (12) being a positive electrode tab, and the other of the first tab (11) and the second tab (12) being a negative electrode tab, the positive electrode tab being electrically connected to the housing (20) via the positive electrode lead tab (70), and the end of the first tab (11) and / or the second tab (12) away from the electrode body (10) each having a plurality of spaced-apart connection portions (111, 121), The first post (41) is electrically connected to the first tab (11), The second post (42) is electrically connected to the second tab (12), The electrode body (10) has two long axes and two short axes on opposite sides, the first tab (11) is provided along one of the long axes, the second tab (12) is provided along the other long axis, one of the first post (41) and the second post (42) is a positive electrode post, the other of the first post (41) and the second electrode post (42) is a negative electrode post, and both the positive electrode post and the negative electrode post are provided along one of the short axes. The positive electrode lead tab (70) is physically and electrically connected to the positive electrode tab and the positive electrode post, respectively. The battery unit (100) is characterized in that the positive electrode lead tab (70) extends along the longitudinal axis.

2. The positive electrode tab is a bent member having a first opening groove (112), and the battery unit (100) further includes a first insulating side plate (30). The battery unit (100) according to claim 1, characterized in that the first insulating side plate (30) is provided in the first opening groove (112) such that at least a portion of the positive electrode tab is located between the first insulating side plate (30) and the positive electrode lead tab (70).

3. The battery unit (100) according to claim 2, characterized in that the first insulating side plate (30) and the electrode body (10) are connected by an adhesive layer.

4. Further including a post cover plate (40), The battery unit (100) according to claim 1, characterized in that the post cover plate (40) is provided along one of the short axes, the positive electrode post and the negative electrode post are provided on the post cover plate (40), and the post cover plate (40) is physically and electrically connected to the housing (20) and the positive electrode lead tab (70), respectively.

5. Further including an aluminum cover plate (43), The battery unit (100) according to claim 4, characterized in that the aluminum cover plate (43) is provided on the post cover plate (40) and electrically connected to the housing (20), one end of the positive electrode lead tab (70) is connected to the aluminum cover plate (43), and the aluminum cover plate (43) is electrically connected to the positive electrode post.

6. Further including a negative electrode lead tab (90), The battery unit (100) according to claim 1, characterized in that the negative electrode lead tab (90) is physically and electrically connected to the negative electrode tab and the negative electrode post, respectively.

7. The negative electrode tab is a bent member having a second opening groove (122), and the battery unit (100) further includes a second insulating side plate (60) and a third insulating side plate (80). The second insulating side plate (60) is provided in the second opening groove (122) such that at least a portion of the negative electrode tab is located between the second insulating side plate (60) and the negative electrode lead tab (90), The battery unit (100) according to claim 6, characterized in that the third insulating side plate (80) is provided along one of the short axes and located between the negative electrode pull tab (90) and the electrode body (10) so as to insulate the negative electrode pull tab (90) and the electrode body (10).

8. The negative electrode lead tab (90) includes a first body (91) and a second body (92), The first body (91) extends along the longitudinal axis and is connected to the negative electrode tab, The battery unit (100) according to claim 7, characterized in that the second body (92) extends along the short axis direction and is connected to the first body (91), the third insulating side plate (80), and the negative electrode post, respectively.

9. The battery unit (100) according to any one of claims 1 to 8, characterized in that the plurality of connection portions (111, 121) are arranged at intervals along the extending longitudinal axis.

10. The battery unit (100) according to any one of claims 1 to 8, characterized in that the plurality of connection parts (111, 121) are connected in series.

11. Further including an explosion-proof valve cover plate (50), The battery unit (100) according to claim 4 or 5, characterized in that the explosion-proof valve cover plate (50) is provided along the short axis and is located on both sides of the long axis and the post cover plate (40).

12. The battery unit (100) according to any one of claims 1 to 8, characterized in that the size of the long axis is larger than the size of the short axis.

13. A battery module characterized by including a battery unit (100) according to any one of claims 1 to 8.

14. A vehicle characterized by including the battery module described in claim 13.

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