CN216389650U

CN216389650U - Busbar and battery module

Info

Publication number: CN216389650U
Application number: CN202122387793.5U
Authority: CN
Inventors: 王东; 张万良
Original assignee: Weichai Power Co Ltd; Weichai New Energy Technology Co Ltd
Current assignee: Weichai New Energy Power Technology Co ltd; Weichai Power Co Ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-04-26
Anticipated expiration: 2031-09-30

Abstract

The utility model discloses a bus bar and a battery module, and relates to the technical field of power batteries. The busbar comprises a busbar body, electrode connecting positions and supporting bulges, wherein at least two electrode connecting positions are arranged along the length direction of the busbar body, the thickness of each electrode connecting position is smaller than that of the busbar body, and the electrode connecting positions are welded with the poles of the battery cell; the supporting bulge is arranged between the two adjacent electrode connecting positions and used for supporting the upper cover plate of the battery module. According to the bus bar provided by the utility model, the thickness of the bus bar body can ensure the overcurrent capacity of the battery module, and the thickness of the electrode connecting position can ensure the welding quality of the bus bar and the pole welding of the battery cell. Support through set up the upper cover plate that is used for supporting the battery module between two adjacent electrode connection positions protruding for alleviate because battery module charge-discharge in-process electric core inflation brings for the utmost point post welding position of electric core stress, reduce the risk that the battery module connection became invalid.

Description

Busbar and battery module

Technical Field

The utility model relates to the technical field of power batteries, in particular to a bus bar and a battery module.

Background

In an electric vehicle power battery system, a battery module is an important component of the electric vehicle power battery system. The electric core is connected in series-parallel in the battery module and is completed through the busbar, and the busbar is connected with the pole of the electric core through laser welding.

In order to guarantee that the battery module busbar has sufficient current capacity among the prior art, general busbar thickness is 2mm, but 2mm thickness can cause many problems for laser welding, if welding quality is unstable, mainly reflects in the welding seam molten bath degree of depth inadequately, and the welding defects such as the utmost point post welding pulling force of busbar and electric core is not up to standard (rosin joint). Moreover, because busbar and upper cover plate hug closely and be connected, battery module probably causes the risk of battery module connection failure at the stress that the in-process electric core inflation of charge-discharge brought for the utmost point post welding position of electric core.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a bus bar and a battery module, wherein the bus bar can improve the overcurrent capacity of the battery module, ensure the welding quality and reduce the risk of connection failure of the battery module.

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

a busbar, comprising:

a busbar body;

the electrode connecting positions are arranged along the length direction of the busbar body, the thickness of each electrode connecting position is smaller than that of the busbar body, and the electrode connecting positions are welded with the poles of the battery cell;

and the supporting bulges are arranged between every two adjacent electrode connecting positions and are used for supporting the upper cover plate of the battery module.

As an alternative of the bus bar, a first fixing hole is formed in the supporting protrusion, a second fixing hole is formed in the upper cover plate, the first fixing hole and the second fixing hole are arranged opposite to each other, and an insulating fixing member penetrates through the second fixing hole and the first fixing hole to fix the upper cover plate and the bus bar.

As an alternative to the bus bar, the support protrusion is an arc-shaped protrusion or a square-shaped protrusion.

As an alternative to the bus bar, the thickness of the electrode connection site is one-half of the thickness of the bus bar body.

As an alternative of the busbar, a first positioning hole is provided on the electrode connecting position, and the first positioning hole is used for positioning the busbar and the pole of the battery cell.

As an alternative of the busbar, a boundary line of an electrode connection position is further arranged on the busbar body, and the boundary line of the electrode connection position and the first positioning hole are concentrically arranged and used for limiting a boundary of a laser welding track when the electrode connection position and a pole of the battery cell are welded.

As an alternative of the bus bar, the laser welding track is circular, the diameter of the circular laser welding track is 8mm to 10mm, and the diameter of the boundary line of the electrode connection site is greater than or equal to the diameter of the laser welding track.

As an alternative of the busbar, a second positioning hole is further formed in the busbar body, and the second positioning hole is formed in two sides of the supporting protrusion and used for positioning the voltage and temperature collecting plate.

As an alternative to the bus bar, the bus bar body is made of an aluminum plate.

The utility model provides a battery module, includes a plurality of electric cores, upper cover plate and as above any scheme the busbar, the busbar is with two at least adjacent electric core welded connection, the upper cover plate set up in the busbar is kept away from one side of electric core.

The utility model has the beneficial effects that:

the bus bar provided by the utility model is used for being welded and connected with at least two adjacent battery cells in the battery module by arranging at least two electrode connecting positions in the length direction of the bus bar body. Through setting up the thickness with the electrode connection position for being less than the thickness of busbar body for the overcurrent capacity of battery module can be guaranteed to the thickness of busbar body, and the welded welding quality of the utmost point post of busbar and electric core can be guaranteed to the thickness of electrode connection position. Support through set up the upper cover plate that is used for supporting the battery module between two adjacent electrode connection positions protruding for alleviate because battery module charge-discharge in-process electric core inflation brings for the utmost point post welding position of electric core stress, reduce the risk that the battery module connection became invalid.

According to the battery module, the bus bar is applied, so that the battery module not only has enough overcurrent capacity, but also can ensure the welding quality of the bus bar and the pole of the battery cell; meanwhile, the risk of connection failure of the battery module is reduced, and the service life of the battery module is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery module according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a bus bar according to an embodiment of the present invention.

In the figure:

100. a battery module;

101. a bus bar; 102. an electric core; 103. an upper cover plate; 104. plastic rivets; 105. an end plate; 106. binding bands; 107. an insulating sheet;

1. a busbar body; 2. an electrode connection site; 3. a support boss;

11. a second positioning hole; 21. a boundary line of the electrode connection site; 22. a first positioning hole; 31. a first fixing hole.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 and fig. 2, the present embodiment provides a battery module, which includes a plurality of battery cells 102, an upper cover plate 103, and a bus bar 101, where the bus bar 101 is connected to at least two adjacent battery cells 102 in a welding manner, and the upper cover plate 103 is disposed on one side of the bus bar 101, which is far away from the battery cells 102.

In this embodiment, the positive pole and the negative pole of the battery cell 102 are both located at the same end of the battery cell 102, the plurality of battery cells 102 are arranged side by side and fixed by two binding bands 106, and the binding bands 106 are sleeved around the plurality of battery cells 102 arranged side by side, so that the connection strength of the battery module 100 can be improved. The plurality of battery cells 102 fixed by the binding band 106 are connected in series and parallel by the bus bar 101. The positive pole and the negative pole of the battery cell 102 are both connected with the bus bar 101 in a welding manner. An upper cover plate 103 is arranged above the plurality of battery cells 102 arranged side by side, the upper cover plate 103 is fixedly connected with the busbar 101, end plates 105 are arranged on two sides of the plurality of battery cells 102 arranged side by side, and the end plates 105 are used for supporting and fixing the battery module 100.

Insulating sheets 107 are further disposed between two adjacent battery cells 102 and between the battery cells 102 and the end plate 105, and the insulating sheets 107 play a role of protective insulation between the battery cells 102 and between the battery cells 102 and the end plate 105.

In the present embodiment, the upper cover plate 103 and the insulation sheet 107 are both made of polycarbonate and have a thickness of 0.25mm to 0.5 mm.

The battery module provided by the embodiment has sufficient overcurrent capacity, and can ensure the welding quality of the busbar 101 and the pole of the battery cell 102; meanwhile, the risk of connection failure of the battery module 100 is reduced, and the service life of the battery module 100 is prolonged.

As shown in fig. 3, the present embodiment further provides a busbar, which includes a busbar body 1, electrode connection sites 2 and support protrusions 3, wherein at least two electrode connection sites 2 are arranged along the length direction of the busbar body 1, the thickness of the electrode connection sites 2 is smaller than that of the busbar body 1, and the electrode connection sites 2 are welded to the poles of the battery cell 102; the supporting protrusions 3 are disposed between two adjacent electrode connection sites 2, and serve to support the upper cap plate 103 of the battery module 100.

At least two electrode connecting positions 2 are arranged in the length direction of the busbar body 1, so that the busbar body is used for being connected with at least two adjacent battery cells 102 in the battery module 100 in a welding manner. Through setting up the thickness with electrode connection position 2 to be less than the thickness of busbar body 1 for the overcurrent capacity of battery module 100 can be guaranteed to the thickness of busbar body 1, and the welded welding quality of the utmost point post of busbar 101 and electric core 102 can be guaranteed to the thickness of electrode connection position 2. Support protrusion 3 through set up the upper cover plate 103 that is used for supporting battery module 100 between two adjacent electrode connection position 2 for alleviate because battery module 100 charges and discharges the stress that the inflation brought for the utmost point post welding position of electric core 102 of in-process electric core 102, reduce the risk that battery module 100 connects inefficacy.

Alternatively, the busbar body 1 is made of an aluminum plate. In this embodiment, the busbar body 1 is formed by punching and folding two aluminum plates with a thickness of 1mm, and is arranged to be symmetrical with the support protrusion 3 as a center line.

Alternatively, the thickness of the electrode connection site 2 is one-half of the thickness of the bus bar body 1. In this embodiment, the electrode connection sites 2 are disposed on both sides of the support protrusion 3, and the thickness of the electrode connection sites 2 is 1 mm. And cutting off the thickness of an aluminum plate at the corresponding position on the bus bar body 1 to form an electrode connecting position 2.

In this embodiment, two electrode connection sites 2 are disposed on each bus bar 101, and one bus bar 101 is used to connect the poles of two adjacent battery cells 102. Of course, in other embodiments, three, four or more electrode connection sites 2 may be disposed on one busbar 101 to connect more electrode posts of the battery cells 102.

As an alternative to the bus bar, the support protrusion 3 is provided with a first fixing hole 31, the upper cover plate 103 of the battery module 100 is provided with a second fixing hole, the first fixing hole 31 is disposed opposite to the second fixing hole, and the upper cover plate 103 and the bus bar 101 are fixed by an insulating fixing member passing through the second fixing hole and the first fixing hole 31. In this embodiment, the insulating fixing member is a plastic rivet 104, and after the first fixing hole 31 and the second fixing hole are oppositely disposed, the upper cover plate 103 and the bus bar 101 are riveted by the plastic rivet 104, so as to perform an insulating protection function.

Of course, in other embodiments, the insulating fixing member may also be other insulating fixing members such as a plastic screw or a plastic snap.

Alternatively, the support protrusions 3 are arc-shaped protrusions or square-shaped protrusions. In this embodiment, the supporting protrusion 3 is an arc protrusion, and the arc protrusion is configured to ensure the supporting effect of the supporting protrusion 3 on the upper cover plate 103, and is easy to process. Of course, in other embodiments, the support protrusions 3 may also be provided as square protrusions.

As an alternative to the bus bar, the electrode connection site 2 is provided with a first positioning hole 22, and the first positioning hole 22 is used for positioning the bus bar 101 and the pole of the battery cell 102. When the busbar 101 is welded with the pole of the battery cell 102, the central positions of the pole of the battery cell 102 are aligned through the first positioning hole 22, and after welding is completed, the welding quality of the pole of the busbar 101 and the pole of the battery cell 102 can be checked through the first positioning hole 22, so that the occurrence of welding defects such as cold welding is avoided.

As an alternative of the bus bar, the bus bar body 1 is further provided with a boundary line 21 of the electrode connection position, and the boundary line 21 of the electrode connection position is concentrically arranged with the first positioning hole 22 and used for limiting the boundary of the laser welding track when the electrode connection position 2 is welded with the pole of the battery core 102. In the present embodiment, the welding of the bus bar 101 and the pole of the battery cell 102 is laser welding, and the laser is located above the bus bar body 1, and the welding is performed with a set laser welding track, and in order to ensure the welding quality, the laser welding track is limited within the boundary line 21 of the electrode connection position.

As an alternative of the bus bar, the laser welding track is circular, the diameter of the circular laser welding track is 8 mm-10 mm, and the diameter of the boundary line 21 of the electrode connection site is larger than or equal to the diameter of the laser welding track. In the present embodiment, the laser welding trajectory is a circular trajectory having a diameter of 10mm with the center of the first positioning hole 22 as the center. The boundary line 21 of the electrode connection site is a semicircular boundary line having a diameter slightly larger than 10mm and centered at the center of the first positioning hole 22, and the semicircular boundary line is disposed adjacent to the support protrusion 3. Due to the arrangement, the overcurrent capacity of the busbar 101 can be ensured, and the welding quality of the busbar 101 and the pole of the battery cell 102 can be ensured.

As an alternative of the bus bar, the bus bar body 1 is further provided with second positioning holes 11, and the second positioning holes 11 are provided on both sides of the supporting protrusion 3 for positioning the voltage and temperature collecting plates. In this embodiment, the voltage and temperature collecting board is a flexible circuit board, and the flexible circuit board is disposed above the bus bar 101 for collecting the current and the temperature of the battery cell 102. And a support column formed by the collection wiring harness on the flexible circuit board is matched with the second positioning hole 11 and used for positioning the flexible circuit board, and after the flexible circuit board is positioned, the collection wiring harness is welded with the bus bar 101 so as to collect the current and the temperature of the battery cell 102.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. A bus bar, comprising:

a busbar body (1);

the electrode connecting positions (2) are arranged along the length direction of the busbar body (1), the thickness of each electrode connecting position (2) is smaller than that of the busbar body (1), and the electrode connecting positions (2) are welded with the poles of the battery cell (102);

and the supporting protrusions (3) are arranged between two adjacent electrode connecting positions (2) and are used for supporting the upper cover plate (103) of the battery module (100).

2. The busbar according to claim 1, wherein the support protrusion (3) is provided with a first fixing hole (31), the upper cover plate (103) is provided with a second fixing hole, the first fixing hole (31) is disposed opposite to the second fixing hole, and the upper cover plate (103) is fixed to the busbar body (1) by an insulating fixing member passing through the second fixing hole and the first fixing hole (31).

3. Busbar according to claim 1, characterized in that the supporting projections (3) are arc-shaped projections or square projections.

4. The busbar according to claim 1, wherein the thickness of the electrode connection site (2) is half the thickness of the busbar body (1).

5. The busbar according to claim 1, wherein the electrode connecting position (2) is provided with a first positioning hole (22), and the first positioning hole (22) is used for positioning the busbar body (1) and a pole of the battery cell (102).

6. The busbar according to claim 5, wherein a boundary line (21) of an electrode connecting position is further arranged on the busbar body (1), and the boundary line (21) of the electrode connecting position is concentrically arranged with the first positioning hole (22) and used for limiting the boundary of a laser welding track when the electrode connecting position (2) is welded with a pole of the battery core (102).

7. The busbar according to claim 6, wherein the laser welding trace is circular, the diameter of the circular laser welding trace is 8mm to 10mm, and the diameter of the boundary line (21) of the electrode connection site is equal to or larger than the diameter of the laser welding trace.

8. The busbar according to claim 1, wherein the busbar body (1) is further provided with second positioning holes (11), the second positioning holes (11) being provided on both sides of the support protrusion (3) for positioning voltage and temperature collecting plates.

9. The busbar according to claim 1, characterized in that the busbar body (1) is made of aluminum plate.

10. A battery module, characterized by comprising a plurality of battery cells (102), an upper cover plate (103) and the busbar of any one of claims 1 to 9, wherein the busbar (101) is connected with at least two adjacent battery cells (102) by welding, and the upper cover plate (103) is arranged on one side of the busbar (101) away from the battery cells (102).