CN115275527A

CN115275527A - Battery module and power battery comprising same

Info

Publication number: CN115275527A
Application number: CN202210960811.0A
Authority: CN
Inventors: 王磊; 李艳艳; 张国江
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-08-11
Filing date: 2022-08-11
Publication date: 2022-11-01

Abstract

The invention belongs to the technical field of batteries and discloses a battery module and a power battery comprising the same. This battery module includes a plurality of electric cores, busbar support and busbar. A plurality of electric cores are arranged along a first direction, and two polar columns are arranged at the top of the electric core along a second direction at intervals. The busbar support is arranged along the first direction and located between the two polar columns, and the busbar support is provided with a positioning bulge. The busbar is provided with a first part and a second part, the first part is positioned on the busbar bracket, the second part is contacted with and electrically connected with the pole of the battery cell, the busbar is provided with a positioning hole, and the positioning protrusion penetrates through the positioning hole. The busbar and the busbar support in the battery module are well positioned, and the busbar dislocation is effectively avoided from influencing the connection between the busbar and the battery cell.

Description

Battery module and power battery comprising same

Technical Field

The invention relates to the technical field of batteries, in particular to a battery module and a power battery comprising the same.

Background

The power battery is a main power source of the new energy automobile, and determines key indexes of the whole automobile, such as endurance mileage, cost, service life, safety, maintainability and the like. With the popularization of new energy automobiles, the requirements of users on the service performance of power batteries are higher and higher. In order to ensure the safe operation of the power battery, a bus bar support is generally adopted in the power battery to position a bus bar so as to ensure that the internal structure of the power battery is more stable.

Bus bar support among the prior art leads to the fact the interference because of the dislocation easily with the bus bar, leads to bus bar and electric core difficult welding, seriously influences welding quality, and then causes power battery inefficacy easily.

Therefore, it is desirable to provide a battery module and a power battery including the same to solve the above problems.

Disclosure of Invention

An object of the present invention is to provide a battery module, in which a bus bar and a bus bar support are well positioned, and the connection between the bus bar and a battery cell is effectively prevented from being affected by the dislocation of the bus bar.

In order to achieve the purpose, the invention adopts the following technical scheme:

a battery module, comprising:

the battery comprises a plurality of battery cells, a plurality of battery cells and a plurality of battery terminals, wherein the battery cells are arranged along a first direction, and two pole columns are arranged at the tops of the battery cells at intervals along a second direction;

the busbar support is arranged along a first direction and located between the two poles, and a positioning bulge is arranged on the busbar support;

the battery cell comprises a plurality of bus bars, wherein each bus bar is provided with a first part and a second part, the first part is positioned on the bus bar support, the second part is in contact with and electrically connected with the pole of the battery cell, the bus bars are provided with positioning holes, and the positioning protrusions penetrate through the positioning holes.

Optionally, a convex rib is arranged on the side surface of the positioning protrusion, and the bottom of the convex rib abuts against the edge of the positioning hole.

Optionally, the positioning protrusion is an annular rib, and notches are arranged along the height direction of the annular rib and are arranged on two sides of the convex rib.

Optionally, the top of electric core has the gap, be provided with on the busbar support and dodge the groove, be provided with the recess on the busbar, dodge the groove with the recess laminating sets up, dodge the groove with the recess is followed the gap sets up.

Optionally, the length of the positioning hole in the cell arrangement direction is greater than the length of the positioning protrusion in the cell arrangement direction.

Optionally, a rib is arranged on the busbar bracket, and the rib is arranged between two adjacent busbars.

Optionally, a second portion of the busbar is provided with a welding hole, and the busbar is welded to the pole of the battery cell through the welding hole.

Another object of the present invention is to provide a power battery, in which the bus bar and the battery cell are reliably connected, and welding failure is not easy to occur.

the utility model provides a power battery, power battery includes foretell battery module and upper cover, the upper cover lid is located the top of battery module.

Optionally, be provided with the pilot hole on the upper cover, be provided with spacing post on the busbar support, spacing post wears to establish the pilot hole and with upper cover fixed connection.

Optionally, the limiting column is fixedly connected with the upper cover in a hot melting mode.

Has the beneficial effects that:

according to the battery module provided by the invention, the end faces of the bus bar and the battery cell are insulated by arranging the bus bar bracket, so that the short circuit caused by the contact of the end faces of the bus bar and the battery cell is avoided. Set up the location arch on the busbar support, set up the locating hole simultaneously on the busbar, through making the location arch wear to locate the locating hole and realize the location of busbar support and busbar, prevent that the busbar from taking place the dislocation, influencing the connection of busbar and electric core post.

Drawings

Fig. 1 is a schematic view of a part of a structure of a battery module according to the present invention;

fig. 2 is a schematic view of a partial structure of a battery module according to the present invention;

fig. 3 is a schematic structural view of a battery module according to the present invention;

FIG. 4 is a schematic view of a bus bar according to the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 3 at A;

fig. 6 is a schematic view of a partial structure of the power battery provided by the invention.

In the figure:

100. an electric core; 200. a busbar support; 210. positioning the projection; 220. a rib; 230. cutting; 240. an avoidance groove; 250. a rib is protruded; 260. a limiting post; 300. a bus bar; 310. positioning holes; 320. a groove; 330. welding the hole; 400. and (7) covering.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Referring to fig. 1 to 3, the present embodiment provides a battery module including a plurality of battery cells 100, a bus bar support 200, and a bus bar 300. The plurality of battery cells 100 are arranged along a first direction (X-axis direction in the figure), and two poles are arranged at intervals along a second direction (Y-axis direction in the figure) on the tops of the battery cells 100. The busbar support 200 is arranged along the first direction and located between the two poles, and the busbar support 200 is provided with a positioning protrusion 210. The busbar 300 has a first portion and a second portion, the first portion is located on the busbar holder 200, the second portion is in contact with and electrically connected to the pole of the battery cell 100, the busbar 300 is provided with a positioning hole 310, and the positioning protrusion 210 penetrates through the positioning hole 310.

The end faces of the bus bar 300 and the battery cell 100 are insulated by the bus bar support 200, so that the short circuit caused by the end face contact between the bus bar 300 and the battery cell 100 is avoided. The positioning protrusion 210 is arranged on the bus bar support 200, the positioning hole 310 is arranged on the bus bar 300, and the positioning protrusion 210 penetrates through the positioning hole 310 to realize the positioning of the bus bar support 200 and the bus bar 300, so that the bus bar 300 is prevented from being dislocated, and the connection between the bus bar 300 and a pole is prevented from being influenced.

Referring to fig. 1, the battery module in this embodiment includes 12 battery cells 100, and in other embodiments, the number of the battery cells 100 may be set according to use requirements. Every electric core 100 is last all to be provided with anodal utmost point post and negative pole post, and two utmost point posts set up in the both sides at electric core 100 top along electric core 100's width direction second direction (Y axle direction in the picture), and two adjacent electric core 100's anodal utmost point post and negative pole post dislocation set to conveniently establish ties two electric core 100. Referring to fig. 2, the width of the bus bar support 200 is equal to the distance between two poles, so that the bus bar support 200 is just clamped between two poles, on one hand, good insulation performance can be ensured between the end surfaces of the bus bar 300 and the battery cell 100, on the other hand, the positioning of the bus bar support 200 can also be realized, and the dislocation between the bus bar support 200 and the battery cell 100 is prevented.

Further, referring to fig. 3 to 5, the side of the positioning protrusion 210 is provided with a rib 220, and the bottom of the rib 220 abuts against the edge of the positioning hole 310. Optionally, the rib 220 is wedge-shaped to facilitate the insertion of the positioning hole 310 into the positioning protrusion 210. It can be understood that the protruding rib 220 and the positioning protrusion 210 form a snap-fit, which can fix the bus bar 300 and the bus bar support 200, and the snap-fit connection does not need to use additional parts, so that the assembly is very convenient. The distance between the bottom of the rib 220 and the surface of the bus bar support 200 should be greater than or equal to the thickness of the bus bar 300 to ensure that the bus bar 300 is caught between the bottom of the rib 220 and the surface of the bus bar support 200. In the present embodiment, the number of the ribs 220 is two, and two ribs 220 are disposed on two opposite sides of the positioning protrusion 210, and in other embodiments, the number of the ribs 220 is not limited to two, and may be set as needed. Optionally, the positioning protrusion 210 is an annular rib. In this embodiment, the positioning hole 310 is a rounded rectangle, and the annular rib is correspondingly arranged to surround the rounded rectangle, in other embodiments, the positioning hole 310 may be a kidney shape, an oval shape or other shapes, and the shape of the annular rib may be set according to the shape of the positioning hole 310.

In this embodiment, the slits 230 are provided along the height direction of the annular rib, and the slits 230 are provided on both sides of the rib 220. The provision of the slits 230 enables the positioning protrusions 210 to contract and rebound in the width direction to reserve a deformation space, thereby facilitating the fixation of the bus bar holder 200 and the bus bar 300. It is understood that the width of the positioning protrusion 210 and the size of the protruding rib 220 are set according to the width of the positioning hole 310, and the positioning hole 310 is required to be able to be sleeved on the positioning protrusion 210 and to be able to prevent the bus bar 300 from falling off from the bus bar support 200 as much as possible.

Further, the length of the positioning hole 310 in the arrangement direction of the battery cells 100 is greater than the length of the positioning protrusion 210 in the arrangement direction of the battery cells 100. When battery cell 100 carries out the high magnification charge-discharge, battery cell 100 takes place the inflation easily, and its thickness increases, leads to busbar support 200 to take place deformation. With this structure, it is possible to accommodate manufacturing tolerances after the assembly of the plurality of battery cells 100 and dimensional tolerances after the expansion of the battery cells 100.

Further, referring to fig. 4 and 5, a gap is formed at the top of each two adjacent battery cells 100, an avoiding groove 240 is formed in the busbar support 200, a groove 320 is formed in the busbar 300, the avoiding groove 240 and the groove 320 are attached to each other, and the avoiding groove 240 and the groove 320 are arranged along the gap. It is understood that the provision of the avoidance groove 240 can provide a positioning for the installation of the bus bar support 200, and when the assembly is performed, the avoidance groove 240 is disposed corresponding to the gap between the battery cells 100. In this embodiment, the avoiding groove 240 is an arc-shaped groove, and the shape thereof is set according to the shape of the gap between two battery cells 100, so as to ensure that the bottom surface of the bus bar support 200 and the top of the battery cell 100 are completely attached. The groove 320 is also an arc-shaped groove, and the arrangement of the groove 320 ensures that the busbar 300 and the busbar holder 200 are attached after being assembled. The thickness of the busbar support 200 and the height of the pole are kept consistent as much as possible, so that the bottom surface of the busbar 300 and the surface of the pole of the battery cell 100 can be completely attached. In addition, cell 100 inflation leads to the utmost point post interval to draw greatly and causes predeformation, dodges the setting of groove 240 and recess 320 and can effectively reduce the busbar support 200 that utmost point post interval grow caused or busbar 300 and the bad problem of electrical core 100 assembly, dodges groove 240 and recess 320 department height simultaneously and is lower, therefore can reduce busbar 300 and the part of its top and take place the friction, avoids busbar 300 and electrical core 100 welding inefficacy.

Further, with continued reference to fig. 5, the number of the bus bars 300 is plural, and the bus bar bracket 200 is provided with a rib 250, and the rib 250 is disposed between two adjacent bus bars 300. The rib 250 is strip-shaped, and extends along the width direction of the battery cell 100 to separate two adjacent busbars 300. Further, the second portion of the bus bar 300 is provided with a welding hole 330, and the bus bar 300 is welded to the pole of the battery cell 100 through the welding hole 330. Alternatively, laser welding may be used to electrically connect the busbar 300 and the post.

In some embodiments, the first portion of the bus bar 300 is provided with a groove 320, the positioning hole 310 is disposed through the groove 320 along the first direction, and the positioning hole 310 is disposed at an end of the bus bar 300 away from the soldering hole 330, so as to facilitate the mounting and positioning between the bus bar 300 and the bus bar support 200, and facilitate the electrical connection between the second portion of the bus bar 300 and the pole.

Referring to fig. 6, the present embodiment further provides a power battery, which includes the above battery module and an upper cover 400, wherein the upper cover 400 is disposed above the battery module. Optionally, the upper cover 400 is provided with a mounting hole, the busbar bracket 200 is provided with a limiting post 260, and the limiting post 260 penetrates through the mounting hole and is fixedly connected with the upper cover 400. The setting of spacing post 260 has realized the location of upper cover 400 and battery module on the one hand, and on the other hand can make upper cover 400 and battery module connect. In this embodiment, each rib 250 is provided with a position-limiting post 260, and in other embodiments, the position and number of the position-limiting posts 260 may be set as required. Optionally, the upper cover 400 is fixedly connected with the hot-melting limiting column 260, so that the connection is convenient and reliable. Of course, the upper cover 400 and the bus bar support 200 may be fixedly connected by means of bonding, bolting, or the like.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery module, comprising:

the battery comprises a plurality of battery cells (100), wherein the battery cells (100) are arranged along a first direction, and two poles are arranged at intervals along a second direction on the tops of the battery cells (100);

the busbar support (200) is arranged along the first direction and located between the two poles, and a positioning protrusion (210) is arranged on the busbar support (200);

the battery cell structure comprises a plurality of bus bars (300), wherein each bus bar (300) is provided with a first part and a second part, the first part is positioned on the bus bar support (200), the second part is in contact with and electrically connected with the pole of the battery cell (100), a positioning hole (310) is formed in each bus bar (300), and the positioning protrusion (210) penetrates through the positioning hole (310).

2. The battery module according to claim 1, wherein the positioning protrusions (210) are provided at the sides thereof with ribs (220), and the bottoms of the ribs (220) abut the edges of the positioning holes (310).

3. The battery module according to claim 2, wherein the positioning protrusions (210) are annular ribs, and cutouts (230) are provided along the height direction of the annular ribs, the cutouts (230) being provided at both sides of the protruding rib (220).

4. The battery module according to claim 1, wherein a gap is formed at the top of each two adjacent electric cores (100), an avoidance groove (240) is formed in the busbar support (200), a groove (320) is formed in the busbar (300), the avoidance groove (240) and the groove (320) are attached to each other, and the avoidance groove (240) and the groove (320) are arranged along the gap.

5. The battery module according to claim 1, wherein the length of the positioning hole (310) in the arrangement direction of the battery cells (100) is greater than the length of the positioning protrusion (210) in the arrangement direction of the battery cells (100).

6. The battery module according to claim 1, wherein a rib (250) is provided on the bus bar support (200), and the rib (250) is provided between two adjacent bus bars (300).

7. The battery module according to claim 1, wherein the second portion of the busbar (300) is provided with a welding hole (330), and the busbar (300) is welded to the pole of the battery cell (100) through the welding hole (330).

8. A power battery, characterized in that the power battery comprises the battery module according to any one of claims 1-7 and an upper cover (400), and the upper cover (400) is arranged above the battery module.

9. The power battery according to claim 8, wherein the upper cover (400) is provided with a mounting hole, the busbar support (200) is provided with a limiting column (260), and the limiting column (260) penetrates through the mounting hole and is fixedly connected with the upper cover (400).

10. The power battery according to claim 9, wherein the limiting column (260) is fixedly connected with the upper cover (400) through hot melting.