CN219419406U - Battery module and electric vehicle with same - Google Patents

Abstract

The utility model discloses a battery module and an electric vehicle with the same, wherein the battery module comprises a plurality of battery units and a bus bar which are stacked, the battery units are divided into a plurality of first battery groups arranged along a first direction and a plurality of second battery groups arranged along a second direction, the first battery groups and the second battery groups are alternately arranged, and the in-group parallel connection and the inter-group series connection are realized through the bus bar, and the bus bar comprises a first bus bar for connecting all the battery units in the first battery groups and the second battery groups and a second bus bar for connecting the adjacent battery units in the first battery groups and the second battery groups and overlapping the first bus bar.

Description

Battery module and electric vehicle with same

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery module and an electric vehicle with the battery module.

Background

The application of power batteries is more and more widespread, the electric energy that single battery unit can provide is limited, people usually adopt the busbar to connect a plurality of electric core electricity, with parallelly connected and series connection mode with the electric energy stack output of electric core in order to satisfy the user demand. In the prior art disclosed in the chinese patent No. CN106469822B issued by 2021, 6 and 8 and the chinese patent No. CN217009484U issued by 2022, 7 and 19, the former uses bus bars with different cross-sectional areas to solve the problem of excessive local current, and the latter uses bus bars with grooves in the middle part to cope with the technical problem of deformation and energy absorption.

In order to obtain the bus bars with different thicknesses and the technical solution of grooving on the bus bars, the manufacturing difficulty of the bus bars is increased, so that the bus bars in the battery module of the prior art have room for improvement from the viewpoints of manufacturing cost and assembly process.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide a battery module adopting a busbar with simple manufacturing process and more reliable performance.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the battery module comprises a plurality of battery units and bus bars, wherein the battery units comprise first lugs and second lugs, the battery units are divided into a plurality of first battery groups arranged along a first direction and a plurality of second battery groups arranged along a second direction, the first battery groups and the second battery groups are alternately arranged and are connected in parallel in groups and in series among groups through the bus bars, and the bus bars comprise first bus plates used for connecting all battery units in the first battery groups and the second battery groups and second bus plates used for connecting two adjacent battery units in the first battery groups and the second battery groups and overlapping with the first bus plates.

Further, the first direction and the second direction are opposite and parallel to each other, and the first tab in the first battery pack and the second tab in the second battery pack are aligned along a third direction perpendicular to the first direction.

Further, an even number of first through holes are formed in the first bus plate, the first bus plate is fixedly connected with the first electrode lugs and the second electrode lugs through the first through holes respectively, at least two second through holes are formed in the second bus plate, and the second bus plate is fixedly connected with the first bus plate through the second through holes.

Further, the center of the second through hole is aligned with the center of the first through hole and the aperture of the second through hole is larger than the aperture of the first through hole.

Further, the number of the battery units in the first battery pack is the same as the number of the battery units in the second battery pack, the number of the battery units in the first battery pack and the number of the battery units in the second battery pack are three, and the bus bar further comprises a third bus plate arranged between the first bus plate and the second bus plate.

Further, the first bus plate and the second bus plate are provided with bending parts at the joint positions corresponding to two adjacent battery units, and the bending parts of the second bus plate are overlapped with the middle bending parts on the first bus plate and protrude towards the direction far away from the battery units.

Further, one of the first tab and the second tab of the battery unit at the end is electrically connected with the first bus plate, and the other tab is electrically connected with a lead-out plate for electrically communicating with the outside of the battery module.

Further, the minimum cross-sectional area of the end plate is not smaller than the minimum cross-sectional area of the bus bar at the overlapping position of the first bus plate and the second bus plate.

Further, the end tab includes a connection portion extending beyond the battery cell, and the connection portion is provided with a mounting hole.

It is also an object of the present utility model to provide an electric vehicle having a power battery provided therein, in which the battery module described in any one of the above is employed.

By adopting the technical scheme, the utility model has the beneficial effects that:

the bus bar adopted on the battery module is simple in structure, easy to manufacture and reliable in connection mode, so that the manufacturing cost of the battery module is reduced, the reliability of the battery module is improved, and the electric vehicle using the battery module also has more stable and safer power.

Drawings

Fig. 1 is a schematic structural view of a battery module according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a first battery pack and a second battery pack in the battery module shown in fig. 1;

fig. 3 is a partially exploded view of the battery module shown in fig. 1;

fig. 4 is a schematic view illustrating a structure of a bus bar in the battery module shown in fig. 1;

fig. 5 is a schematic plan view of a part of the structure of the battery module shown in fig. 1;

fig. 6 is a schematic top view showing a part of the structure of a battery module according to another embodiment of the present utility model;

fig. 7 is a schematic view illustrating a structure of a bus bar in the battery module shown in fig. 6;

fig. 8 is a schematic top view showing a part of the structure of a battery module according to another embodiment of the present utility model.

In the figure:

100. a battery module; 10. a busbar; 11 11a,11b, a first busbar; 110,110a, a first via; 112. a signal via; 113,113a, bends; 12,12a,12b, a second bus plate; 120,120a, second via; 122. a signal via; 123. a bending part; 13b, a third bus plate; 20. a battery unit; 201. a first tab; 202. a second lug; 21,21a,21b, a first battery pack; 22,22a,22b, a second battery pack; 31 32, a lead-out plate; 301. a connection part; 302. a mounting hole; 41. signal columns.

Description of the embodiments

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

Referring to fig. 1 to 3, the embodiment of the utility model provides a battery module 100, which includes a plurality of stacked battery units 20 and a bus bar 10, wherein the battery units 20 are preferably square battery cells, the battery units 20 include a first tab 201 and a second tab 202 respectively representing a positive electrode and a negative electrode, the bus bar 10 is made of conductive metal, and may be made of common conductive materials such as copper, aluminum, nickel, copper or aluminum alloy, etc. and has a sheet structure, the width of the bus bar is preferably a single tab capable of completely covering the battery units 20, and the bus bar 10 is preferably fixedly connected with the first tab 201 or the second tab 202 by laser welding to achieve the purpose of electrical conduction while physical fixation is achieved.

The plurality of battery cells 20 are divided into a plurality of first battery packs 21 arranged along a first direction and a plurality of second battery packs 22 arranged along a second direction, wherein the first direction is different from the second direction in that the arrangement positions of the positive electrode and the negative electrode are opposite, that is, the first direction and the second direction are opposite and parallel to each other. The first tab 201 in the first battery pack 21 is aligned with the second tab 202 in the second battery pack 22 along a third direction perpendicular to the first direction and the second direction; the second tab 202 in the first battery pack 21 is also aligned in the third direction with the first tab 201 in the second battery pack 22. The first battery packs 21 and the second battery packs 22 are alternately arranged, and parallel connection between the battery cells 20 inside the first battery pack 21 and the second battery pack 22 and serial connection between the two battery packs 21 and 22 are realized through the bus bar 10.

As shown in fig. 1 and 5, the bus bar 10 includes a first bus plate 11 for connecting all the battery cells 20 in the first battery pack 21 and the second battery pack 22, and a second bus plate 12 for connecting adjacent two battery cells 20 in the first battery pack 21 and the second battery pack 22 and overlapping the first bus plate 11 with each other. The first tab 201 and the second tab 202 of each battery unit 20 are respectively in electrical communication with different first bus plates 11 that are parallel to each other. In the third direction, the first tabs 201 of all the battery cells 20 in the first battery pack 21 are electrically connected through the first bus plate 11, the second tabs 202 of all the battery cells 20 in the second battery pack 22 adjacent to the first battery pack 21 are electrically connected through the same first bus plate 11, and the first battery pack 21 is electrically connected with the adjacent second battery pack 22 through the first bus plate 11. Specifically, in the present embodiment, the first bus plate 11 electrically communicates the negative electrode of the first battery pack 21 with the positive electrode of the second battery pack 22. Meanwhile, the first tab 201 of the second battery pack 22 is electrically connected to the second tab 202 of the first battery pack 21 adjacent to the second battery pack 22 from the other side through the other first bus plate 11, that is, the positive electrode of the second battery pack 22 is electrically connected to the negative electrode of the first battery pack 21 at one side, and the negative electrode of the second battery pack 22 is electrically connected to the positive electrode of the first battery pack 21 at the other side, so as to realize the parallel connection and the series connection of the battery cells 20. Since the current of the bus bar 10 is multiplied at the position of the series connection compared with the current at the parallel connection, the first bus plate 11 at the position of the series connection has insufficient cross section to allow the current to pass smoothly or has insufficient overcurrent capability, and if only the first bus plate 11 is used for conduction, local heating occurs, and the rated power transmission of the battery module 100 is limited. The utility model adopts the second bus plate 12 to cover the upper parts of the lugs of the two adjacent battery units 20 between the first battery unit 21 and the second battery unit 22 so as to increase the conductive cross section area of the bus bar 10 at the serial connection position, thereby ensuring that the combined effect of each battery unit 20 is fully utilized and realizing the safe and reliable operation of the battery module 100.

In order to achieve the above-mentioned functions of the battery module 100, as shown in fig. 1, one of the first tab 201 and the second tab 202 of the battery cell 20 at the end is electrically connected to the first busbar 11, and the other tab of the first tab 201 and the second tab 202 of the battery cell 20 at the end is electrically connected to the lead-out plate 31 and the lead-out plate 32 for electrical communication with the outside of the battery module 100, the materials of the lead-out plate 31 and the lead-out plate 32 are preferably the same as those of the busbar 10, that is, the materials of the first busbar 11 and the second busbar 12 are the same, and the lead-out plates 31 and 32 serve as the positive electrode connection end and the negative electrode connection end of the battery module 100, respectively. The minimum cross-sectional area of the end plate 31 and the end plate 32 is not smaller than the minimum cross-sectional area of the busbar 10 at the position where the second busbar 12 is located. Preferably, in the case where the width of the end plates 31 and 32 is equivalent to the bus bar 10, the total thickness of the end plates 31 and 32 is not lower than the sum of the thickness of the second bus plate 12 and the thickness of the first bus plate 11. For facilitating external connection, the end plates 31,32 include connection portions 301 extending beyond the battery cells 20, and the connection portions 301 are provided with mounting holes 302, the mounting holes 302 being for connection with external cables or for mounting bolts.

As shown in fig. 4, in order to achieve the above-mentioned welding and electrical connection, the first bus plate 11 is provided with an even number of first through holes 110, and the first bus plate 11 is welded and fixed with each first tab 201 in the first battery pack 21 and each second tab (202) in the second battery pack 22 through the first through holes 110, and besides laser welding, other manners such as riveting and bolting with the tabs may be adopted, which will not be described in detail. The second bus plate 12 is provided with at least two second through holes 120, and the second bus plate 12 is fixedly connected with the first bus plate 11 through the second through holes 120. The center of the second through hole 120 is aligned with the center of the first through hole 110 at the corresponding position, and the aperture of the second through hole 120 is larger than that of the first through hole 110, so that the welding of the second through hole 120 can be realized without damaging the first through hole 110 welded in advance. Further, the battery unit 20 is further connected with a signal post 41, the positions of the first bus plate 11 and the second bus plate 12 corresponding to the signal post 41 are respectively provided with signal through holes 112 and 122, and the signal post 41 is used for collecting signals such as temperature or battery voltage after penetrating through the signal through holes 112 and 122. In order to cope with the thermal expansion deformation of the battery unit 20, the first bus plate 11 and the second bus plate 12 are provided with bending parts 113 and 123 above the gap corresponding to two adjacent battery units 20, that is, the joint of the two adjacent battery units 20, the bending parts 123 on the second bus plate 12 are overlapped with the bending parts 113 located at the middle position on the first bus plate 11, and protrude towards the direction far away from the battery unit 20, the bending parts 113 and 123 are allowed to be slightly stretched and deformed to cope with the expansion of the battery unit 20, and the battery unit 20 will be pulled to the welding position between the two lugs after being expanded, so that the bending parts 113 and 123 can avoid damaging the welding quality between the lugs and the bus bar 10 due to the expansion of the battery unit 20, that is, the reliability of the battery module 100 can be improved.

The number of battery cells included in the first battery pack 21 and the second battery pack 22 in the above-described embodiment is two, and preferably the number of battery cells 20 in the first battery pack 21 and the second battery pack 22 according to the present application is the same. In another embodiment, as shown in fig. 6 and 7, the first battery pack 21a and the second battery pack 22a may respectively include three battery units 20, the first bus plate 11a is respectively and electrically connected to the anodes of the three battery units 20 in the first battery pack 21a, and is also electrically connected to the cathodes of the three battery units 20 in the second battery pack 22a disposed adjacently, and the second bus plate 12a is disposed between the adjacent battery units 20 with different orientations in the first battery pack 21a and the second battery pack 22a and covers the first bus plate 11a, which is the same as the principle of the previous embodiment. Further, as shown in fig. 8, in other embodiments, when the number of the battery cells 20 in the first battery pack 21b and the second battery pack 22b is three, a third bus plate 13b may be further disposed between the first bus plate 11b and the second bus plate 12b, and the effective current flow area in the bus bar 10b at this time increases with the increase of the superimposed current, so that the power output design of the battery module 100 is optimized, and a safer and more reliable battery module 100 is obtained.

The embodiment of the utility model also provides an electric vehicle, which is internally provided with a power battery, wherein the power battery comprises at least one battery module 100 as described in the embodiment, and the power battery can obtain safer and more efficient power no matter whether the electric vehicle is a passenger car or a truck.

The above embodiments merely illustrate the basic principle and features of the present utility model, and the present utility model is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. The battery module (100) comprises a plurality of battery units (20) and bus bars (10) which are stacked, wherein each battery unit (20) comprises a first lug (201) and a second lug (202), each battery unit (20) is divided into a plurality of first battery packs (21) placed along a first direction and a plurality of second battery packs (22) placed along a second direction, the first battery packs (21) and the second battery packs (22) are alternately arranged, and in-group parallel connection and inter-group series connection are realized through the bus bars (10), and the battery module is characterized in that each bus bar (10) comprises a first bus bar (11) used for connecting all battery units (20) in the first battery packs (21) and the second battery packs (22), and a second bus bar (12) used for connecting two adjacent battery units (20) in the first battery packs (21) and the second battery packs (22) and mutually overlapped with the first bus bar (11).

2. The battery module (100) according to claim 1, wherein: the first direction and the second direction are opposite and parallel to each other, and a first tab (201) in the first battery pack (21) and a second tab (202) in the second battery pack (22) are aligned along a third direction perpendicular to the first direction.

3. The battery module (100) according to claim 1, wherein: be equipped with even number first through-hole (110) on first busbar board (11), first busbar board (11) are through first through-hole (110) respectively with first utmost point ear (201) and second utmost point ear (202) fixed connection, be equipped with two at least second through-holes (120) on second busbar board (12), second busbar board (12) are through second through-hole (120) and first busbar board (11) fixed connection.

4. The battery module (100) according to claim 3, wherein: the center of the second through hole (120) is aligned with the center of the first through hole (110) and the aperture of the second through hole (120) is larger than the aperture of the first through hole (110).

5. The battery module (100) according to claim 1, wherein: the number of the battery units (20) in the first battery pack (21) is the same as the number of the battery units (20) in the second battery pack (22), the number of the battery units (20) in the first battery pack (21) and the number of the battery units (20) in the second battery pack (22) are three respectively, and the bus bar (10) further comprises a third bus plate (13) arranged between the first bus plate (11) and the second bus plate (12).

6. The battery module (100) according to claim 1, wherein: the first bus plate (11) and the second bus plate (12) are provided with bending parts (113, 123) at the joint positions of two adjacent battery units (20), and the bending parts (123) of the second bus plate (12) are overlapped with the bending parts (113) positioned in the middle on the first bus plate (11) and protrude towards the direction far away from the battery units (20).

7. The battery module (100) according to claim 1, wherein one of the first tab (201) and the second tab (202) of the battery cell (20) at the end is electrically connected to the first bus plate (11), and the other is electrically connected to the lead-out plate (31, 32) for electrical communication with the outside of the battery module (100).

8. The battery module (100) according to claim 7, wherein the minimum cross-sectional area of the outlet plates (31, 32) is not smaller than the minimum cross-sectional area of the bus bar (10) at the overlapping portion of the first bus plate (11) and the second bus plate (12).

9. The battery module (100) according to claim 7, wherein: the lead-out plates (31, 32) comprise connecting parts (301) extending beyond the battery units (20), and mounting holes (302) are formed in the connecting parts (301).

10. An electric vehicle in which a power battery is provided, characterized in that the power battery comprises a battery module (100) according to any one of claims 1-9.