CN220122044U - Busbar assembly and battery pack - Google Patents

Abstract

The utility model provides a busbar assembly and a battery pack, wherein the busbar assembly comprises a connecting bar, wherein the connecting bar is arranged on a battery module and is used for connecting two single batteries adjacently arranged along a first direction in series in the first direction and connecting two single batteries adjacently arranged along a second direction in parallel in the second direction; the series connection row is laid on the upper side of the connection row and is used for connecting two adjacent battery modules in series to form a battery pack; the positive electrode row is connected to the positive electrode output end of the battery pack, and the positive electrode row is laid on the top of the battery pack; and the negative electrode row is connected to the negative electrode output end of the battery pack, and the negative electrode row is laid on the top of the battery pack. The utility model can facilitate the layout of the positive electrode row and the negative electrode row by arranging the positive electrode row, the negative electrode row and the series connection row at the top of the battery module, has small occupied space and high installation stability, and is beneficial to improving the safety of the battery pack.

Description

Busbar assembly and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a busbar assembly and a battery pack.

Background

The existing cylindrical power battery pack tends to develop in the CTP direction, and is high in battery energy density and production efficiency. In a conventional battery pack, a certain number of unit batteries distributed in an arrangement mode are divided into a battery module, the battery pack generally comprises a plurality of battery modules, and the battery pack also comprises a CCS assembly for connecting the unit batteries in each battery module in series and in parallel, and the battery modules are connected in series through thickened and lengthened copper bars.

However, the long copper bars are difficult to wire and layout in the battery pack, generally extend along the circumference of the inner side surface of the battery pack, occupy large space, and have the risks of difficult installation and easy short circuit of the battery pack caused by extrusion of the battery pack.

Disclosure of Invention

In view of the shortcomings of the prior art, the utility model aims to provide a busbar assembly which is convenient to wire and arrange in a battery pack and occupies a small space.

A second object of the present utility model is to provide a battery pack that is highly safe.

The embodiment of the utility model is realized by the following technical scheme:

a bus bar assembly, comprising: the connecting row is arranged on one battery module and is used for connecting two single batteries adjacently arranged along the first direction in series in the first direction and connecting two single batteries adjacently arranged along the second direction in parallel in the second direction; the series connection row is laid on the upper side of the connection row and is used for connecting two adjacent battery modules in series to form a battery pack; the positive electrode row is connected to the positive electrode output end of the battery pack, and the positive electrode row is laid on the top of the battery pack; and the negative electrode row is connected to the negative electrode output end of the battery pack, and the negative electrode row is laid on the top of the battery pack.

According to a preferred embodiment, the battery further comprises a first insulating layer between the series, positive and negative electrode rows and the respective connection rows.

According to a preferred embodiment, the first insulating layer is a plastic insulating plate, and the series row, the positive electrode row and the negative electrode row are all laid on the upper surface of the plastic insulating plate.

According to a preferred embodiment, the thickness of the first insulating layer is not more than 2mm.

According to a preferred embodiment, the first insulating layer is provided with a plurality of first glue injection openings in a penetrating manner, and the first glue injection openings are communicated with gaps between two adjacent single batteries which are arranged along the first direction and correspond to the first glue injection openings.

According to a preferred embodiment, the busbar assembly further includes a second insulating layer, where the second insulating layer is attached to the upper and lower sides of the connection rows, and is used to fix all the connection rows corresponding to the same battery module or fix all the battery modules corresponding to all the connection rows; the second insulating layer is provided with an operation hole, and the connection row is at least partially exposed through the operation hole to be connected to the corresponding single battery.

According to a preferred embodiment, the thickness of the positive electrode row and the negative electrode row is not more than 1mm.

According to a preferred embodiment, the positive electrode row and the negative electrode row are plate rows.

According to a preferred embodiment, the positive electrode row and the negative electrode row are aluminum plate rows or copper plate rows.

According to a preferred embodiment, the positive electrode row comprises a first body, the input end of which is provided with a first extension, the end of which is provided with a first positive electrode portion, which is connected to the positive end of the single cells of the positive electrode output end of the battery pack.

According to a preferred embodiment, the first extension is provided with a first weakening hole therethrough.

According to a preferred embodiment, the negative electrode row comprises a second body, the input end of which is provided with a second extension, the end of which is provided with a first negative electrode part, which is connected to the negative end of the single cells of the negative electrode output end of the battery.

According to a preferred embodiment, the second extension is provided with a second weakening hole therethrough.

According to a preferred embodiment, the outer sides of the series-connected rows, the positive electrode row and the negative electrode row are all coated with a third insulating layer; and the connection ends of the serial connection row, the positive electrode row and the negative electrode row are exposed out of the third insulating layer.

According to a preferred embodiment, the positive electrode row and the negative electrode row are respectively provided with a second glue injection port which is correspondingly communicated with the first glue injection port; and a third glue injection port which is correspondingly communicated with the first glue injection port is arranged on the connecting row.

According to a preferred embodiment, the connecting row is provided with glue overflow holes; and hole structures which are correspondingly communicated with the glue overflow holes are arranged on the positive electrode row and the negative electrode row.

A battery pack comprises the busbar assembly.

The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:

the positive electrode row, the negative electrode row and the series connection row are arranged on the upper side of the connection row, the positive electrode row and the negative electrode row are arranged at the top end of the battery pack in a wiring way, and the positive electrode output end and the negative electrode output end of the battery pack can be directly output to a high-voltage connector of the battery pack; on the other hand, the space on the periphery of the battery pack can be released, so that the energy density of the battery pack can be improved, and the problem of short circuit of the battery pack caused by extrusion to a high-voltage copper bar when the transmission battery pack is extruded can be solved to a great extent; meanwhile, on the premise of the battery pack box bodies with the same space, the battery pack applying the busbar assembly has larger extruded buffer space and high safety; meanwhile, as the positive electrode row and the negative electrode row are arranged at the top of the connecting row or the battery pack, the positive electrode row and the negative electrode row can be longitudinally connected to provide upward supporting force, so that the structural stability of the connecting structure between the positive electrode row and the negative electrode row and the battery pack is guaranteed, and the safety of the battery pack is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an exploded view of a battery pack according to an embodiment of the present utility model;

fig. 2 is a schematic perspective view of a battery pack according to an embodiment of the present utility model;

fig. 3 is a schematic top view of a battery pack according to an embodiment of the present utility model;

fig. 4 is a schematic perspective view of a lower low-voltage row according to an embodiment of the present utility model;

fig. 5 is a schematic perspective view of an upper high-voltage row according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of an exploded view of a bus assembly according to an embodiment of the present utility model;

FIG. 7 is an enlarged schematic view of a portion of the structure of FIG. 6A;

FIG. 8 is an enlarged schematic view of a portion of the structure at B in FIG. 6;

fig. 9 is a schematic perspective view of a connection row according to an embodiment of the present utility model;

fig. 10 is a schematic perspective view of a serial row according to an embodiment of the present utility model;

fig. 11 is a schematic perspective view of a positive electrode row according to an embodiment of the present utility model;

fig. 12 is a schematic perspective view of a negative electrode row according to an embodiment of the present utility model.

Icon: 100. a battery pack; 101. a battery module; 102. a single battery; 201. a second insulating layer; 202. a connection row; 2021. a second positive electrode portion; 2022. a second negative electrode portion; 2023. a second avoidance gap; 2024. a third glue injection port; 2025. a third weakened hole; 2026. a connection part; 2027. a glue overflow hole; 2028. a working section; 203. a first insulating layer; 204. a series row; 2041. a third body; 2042. a positive electrode module; 2043. a negative electrode module; 205. a positive electrode row; 2051. a first positive electrode portion; 2052. a first extension; 2053. a first weakened hole; 2054. a first body; 206. a negative electrode row; 2061. a first negative electrode portion; 2062. a second extension; 2063. a second weakened hole; 2064. the first avoidance notch; 2065. a second body; 207. a first glue injection port; 208. a second glue injection port; 209. an operation hole.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that, if the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are referred to, the positional relationship is based on the positional relationship shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, and it does not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, 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 unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

Further, in the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", and the like are described with reference to the angle shown in the drawings, and should not be construed as limiting the specific embodiments. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Referring to fig. 1 to 12, a busbar assembly includes a connection row 202, a series row 204, a positive electrode row 205 and a negative electrode row 206, wherein: the connection row 202 is disposed on one battery module 101, and is used for connecting two single batteries 102 adjacently disposed along the first direction in series in the first direction, and is used for connecting two single batteries 102 adjacently disposed along the second direction in parallel in the second direction; the serial connection row 204 is laid on the upper side of the connection row 202, and is used for connecting two adjacent battery modules 101 in series to form the battery pack 100; the positive electrode row 205 is connected to the positive electrode output end of the battery pack 100, and the positive electrode row 205 is paved on the top of the battery pack 100; the negative electrode row 206 is connected to the negative electrode output end of the battery pack 100, and the negative electrode row 206 is laid on top of the battery pack 100.

In this embodiment, as shown in fig. 1 and 3, the busbar assembly provided in this embodiment is applied to a battery pack including eight battery modules 101 as shown in fig. 3, and the eight battery modules 101 constitute two battery packs 100.

Specifically, as shown in fig. 1 and 3, the first direction refers to the front and rear directions of the battery pack as shown in fig. 1, and the second direction refers to the left and right directions of the battery pack as shown in fig. 1. In the present embodiment, a row of unit cells 102 arranged in the first direction, i.e., the front and rear directions of the battery pack as shown in fig. 1, is defined as a cell row, and the battery module 101 includes five cell rows arranged in the second direction, i.e., the left and right directions of the battery pack as shown in fig. 1.

For convenience of description, as shown in fig. 3, one battery pack 100 disposed at the left side is illustrated as an example in the present embodiment. The battery pack 100 is defined to include a first module, a second module, a third module and a fourth module in order from the left to the right of the four battery modules 101. Specifically, as shown in fig. 1, the rear end of the first module is the negative output end of the battery pack 100, the rear end of the fourth module is the positive output end of the battery pack 100, the front end of the first module is connected in series with the front end of the second module under the action of the serial line 204, the rear end of the second module is connected in series with the rear end of the third module, and the front end of the third module is connected in series with the front end of the fourth module.

In this embodiment, the negative electrode row 206 electrically connected to the negative electrode output terminal of the first module and the positive electrode row 205 electrically connected to the positive electrode output terminal of the fourth module are high voltage output poles of the battery pack 100. The positive electrode row 205 and the negative electrode row 206 and the series connection row 204 are all arranged on the upper side of the connection row 202, and the positive electrode row 205 and the negative electrode row 206 are wired on the top end of the battery pack 100, so that direct output from the positive electrode output end and the negative electrode output end of the battery pack 100 to a high-voltage connector (not shown in the figure) of the battery pack can be realized; on the other hand, the space on the periphery of the battery pack 100 can be released, so that the energy density of the battery pack can be improved, the problem of short circuit of the battery pack caused by extrusion to a high-voltage copper bar when the transmission battery pack is extruded can be solved to a great extent, meanwhile, on the premise of a battery pack box body with the same space, the battery pack provided by the embodiment has a larger extruded buffer space (the extruded buffer space is a gap between the battery pack 100 and the inner wall of the box body), and the safety is high; meanwhile, since the positive electrode row 205 and the negative electrode row 206 are disposed at the top of the connection row 202 or the battery pack 100, the positive electrode row 205 and the negative electrode row 206 can be provided with upward supporting force by the connection row 202 in the longitudinal direction, that is, in the up-down direction of the battery pack shown in fig. 1, and the positive electrode row 205, the negative electrode row 206, the series connection row 204 and the connection row 202 are integrally cured and formed in a glue filling manner during use, which is beneficial to ensuring the structural stability of the connection structure between the positive electrode row 205 and the negative electrode row 206 and the battery pack 100, and further improving the safety of the battery pack.

Further, as shown in fig. 1 and 6, the busbar assembly further includes a first insulating layer 203, and the first insulating layer 203 is disposed between the series row 204, the positive electrode row 205, and the negative electrode row 206 and their respective connection rows 202. For convenience of description, the series connection line 204, the positive electrode line 205, and the negative electrode line 206 at the upper side of the connection line 202 are defined herein as upper high-voltage lines, and several connection lines 202 are defined as lower low-voltage lines. The first insulating layer 203 is used to insulate between the upper high-voltage row and the lower low-voltage row, so as to avoid a short circuit between the upper high-voltage row and the lower low-voltage row.

Alternatively, the first insulating layer 203 includes, but is not limited to, a PET insulating film or a plastic plate.

In this embodiment, the first insulating layer 203 is preferably a plastic insulating plate, and the series row 204, the positive electrode row 205 and the negative electrode row 206 are all laid on the upper surface of the insulating plate. When the first insulating layer 203 is a plastic insulating plate, the structural strength of the first insulating layer is relatively high, so that the first insulating layer can play a role in supporting the upper high-voltage row, and the positioning and the installation of the upper high-voltage row, namely the serial row 204, the positive electrode row 205 and the negative electrode row 206 are facilitated; meanwhile, the foaming glue is filled in the box body, when the foaming glue foams, the plastic insulating plate can play a role of a pressing plate, the foaming glue is longitudinally and upwards foamed to play a limiting role, uniform foaming and diffusion of the foaming glue in the lower side area of the plastic insulating plate are facilitated, and the bonding quality of parts is improved.

The thickness of the first insulating layer 203 is not more than 2mm. Preferably, the thickness of the first insulating layer 203 is 1.5mm. By the arrangement, on one hand, the first insulating layer 203 can keep enough strength, and on the other hand, the thickness of the first insulating layer 203 can be effectively controlled, so that the occupancy rate of the top space in the box body is reduced.

Further, as shown in fig. 6 and 7, the first insulating layer 203 is provided with a plurality of first glue injection openings 207 in a penetrating manner, and the first glue injection openings 207 are communicated with gaps between two adjacent single batteries 102 arranged along the first direction. The first glue injection port 207 can facilitate better and more efficient injection of the foaming glue into the gap between two adjacent single batteries 102, and ensure the bonding quality of the single batteries 102.

In this embodiment, in order to further improve the safety of the battery pack and improve the insulation between the upper high-voltage row and the lower low-voltage row, the outer sides of the serial row 204, the positive electrode row 205 and the negative electrode row 206 are all coated with a third insulation layer; the connection ends of the serial line 204, the positive electrode line 205, and the negative electrode line 206 are exposed to the third insulating layer. Optionally, the third insulating layer includes, but is not limited to, a PET insulating film. Thereby, under the combined action of the first insulating layer 203 and the third insulating layer, the insulation between the upper high-voltage row and the lower low-voltage row is effectively ensured, and the short circuit between the two can be effectively prevented.

In this embodiment, as shown in fig. 6 and 8, the busbar assembly further includes a second insulating layer 201, where the second insulating layer 201 is attached to the upper and lower sides of the connection rows 202, and is used to fix all the connection rows 202 corresponding to the same battery module 101 or fix all the battery modules 101 corresponding to all the connection rows 202; the second insulating layer 201 is provided with an operation hole 209, and the connection row 202 is at least partially exposed through the operation hole 209 to be connected to the corresponding unit cell 102. In this embodiment, all the connection rows 202 corresponding to the same battery module 101 are one lower-voltage row, and eight battery modules 101 are correspondingly and one-to-one corresponding to eight lower-voltage rows.

Alternatively, the second insulating layer 201 includes, but is not limited to, a PET insulating film. The second insulating layer 201 can position and fix all the connection rows 202 corresponding to the same battery module 101 as a whole, that is, form a lower low-voltage row, and simultaneously perform insulating treatment on the upper and lower sides of the connection rows 202. The portion of the connection row 202 exposed through the operation hole 209 is used for welding the positive and negative electrode terminals of the unit cells 102 corresponding thereto or the nickel piece of the FPC or the nickel piece of the collection harness.

In this embodiment, the thickness of the positive electrode row 205 and the negative electrode row 206 is optionally not greater than 1mm. Preferably, the thickness of the positive electrode row 205, the negative electrode row 206 and the series row 204 are all 1mm. Further, the positive electrode row 205 and the negative electrode row 206 are plate rows. Alternatively, the positive electrode row 205 and the negative electrode row 206 are aluminum plate rows or copper plate rows. Preferably, the positive electrode row 205, the negative electrode row 206, and the series row 204 are all made of thin aluminum plates. So set up, upper high pressure row is little in the space occupation of box direction in the direction of height, and thin aluminum plate's radiating effect is relatively better, and the security is high, the production of being convenient for, with low costs.

In this embodiment, as shown in fig. 2 and 11, the positive electrode row 205 includes a first main body 2054, the input end of the first main body 2054 is provided with a first extension portion 2052, the end of the first extension portion 2052 is provided with a first positive electrode portion 2051, and the first positive electrode portion 2051 is connected to the positive electrode end of the unit cell 102 at the positive electrode output end of the battery pack 100. In the present embodiment, the input end of the first main body 2054 is provided with five first extending portions 2052 corresponding to five battery rows of the same battery module 101. In this embodiment, the first positive electrode portion 2051 is welded to the positive electrode end of the unit cell 102 corresponding thereto.

Further, a first weakening hole 2053 is provided through the first extension 2052. The first weakening hole 2053 herein can reduce the overcurrent area of the first extension 2052 where the structure blows to act as a fuse when the outside or inside of the battery pack is shorted.

In the present embodiment, the anode row 206 includes a second main body 2065, the input end of the second main body 2065 is provided with a second extension 2062, the end of the second extension 2062 is provided with a first anode part 2061, and the first anode part 2061 is connected to the anode end of the unit cells 102 of the anode output end of the battery pack 100. In the present embodiment, the input end of the second body 2065 is provided with five second extending portions 2062 corresponding to five battery rows of the same battery module 101. In this embodiment, the first negative electrode portion 2061 is welded to the negative electrode end of the cell 102 corresponding thereto. Further, a second weakened hole 2063 is provided through the second extension 2062. The second weakening holes 2063 herein can reduce the overcurrent area of the second extension 2062, where the structure blows out to act as a fuse when the outside or inside of the battery pack is shorted.

In this embodiment, as shown in fig. 12, the second extension portion 2062 is provided with a first escape notch 2064, and the first escape notch 2064 extends through the first negative electrode portion 2061. The first escape notch 2064 is used to escape the positive electrode terminal of the unit cell 102 connected to the first negative electrode portion 2061.

In this embodiment, the positive electrode row 205 and the negative electrode row 206 are respectively provided with a second glue injection port 208 corresponding to the first glue injection port 207. In the longitudinal direction, the first glue injection port 207 and the second glue injection port 208 corresponding thereto are opposite to and communicate with each other. I.e. the second glue injection hole 208 is exposed out of the third insulating layer.

Optionally, in some embodiments, a second glue port 208 is also provided on the series row 204. Accordingly, the second glue injection ports 208 on the serial rows 204 are directly opposite to and communicate with the corresponding first glue injection ports 207.

Correspondingly, the connecting row 202 is provided with a third glue injection port 2024 corresponding to the first glue injection port 207, and the third glue injection port 2024 is at least partially located in the operation hole 209. The third glue injection port 2024 is opposite to and communicates with the corresponding first glue injection port 207. Specifically, after the busbar assembly of the battery pack is mounted, the foaming glue is injected into the second glue injection port 208 and the first glue injection port 207, and the foaming glue passes through the third glue injection port 2024 through the operation hole 209 to enter the gap between the adjacent two single batteries 102.

In this embodiment, as shown in fig. 9, the connection row 202 includes five working portions 2028 connected in sequence, corresponding to five battery rows of the same battery module 101, and two adjacent working portions 2028 are connected by the connection portion 2026.

The working portion 2028 includes a second positive electrode portion 2021 and a second negative electrode portion 2022 connected to each other. For convenience of description, one of the working portions 2028 is described herein as an example. The second positive electrode portion 2021 is configured to be connected to a positive electrode end of one of the unit cells 102 in the battery string, and the second negative electrode portion 2022 of the working portion 2028 is configured to be connected to a negative electrode end of another unit cell 102 adjacent to the unit cell 102, so that two adjacent unit cells 102 in the same battery string are connected in series.

In this embodiment, preferably, the end of the second negative electrode portion 2022 away from the second positive electrode portion 2021 is provided with a second avoiding notch 2023 for avoiding the positive electrode end structure of the single battery 102 connected with the second negative electrode portion 2022, so that the second negative electrode portion 2022 can have a larger contact area with the negative electrode end of the single battery 102, which is beneficial to improving the welding strength of the two.

Preferably, the third glue injection port 2024 is opened at a transition connection portion of the second positive electrode portion 2021 and the second negative electrode portion 2022. At the same time, a third weakening hole 2025 is further formed at the transition connection portion between the second positive electrode portion 2021 and the second negative electrode portion 2022. The third glue injection port 2024 is used to inject the foaming glue, and on the other hand, may serve as a third weakened hole 2025, functioning as the same fuse as the first weakened hole 2053 and the second weakened hole 2063, to improve the safety of the battery pack.

In this embodiment, the second positive electrode portion 2021 is provided with a glue overflow hole 2027. The glue overflow holes 2027 can overflow the excessive foaming glue when the foaming glue is foamed longitudinally upwards, so that the welding structure between the connecting row 202 and the single battery 102 is prevented from being failed due to the fact that the foaming glue lifts the connecting row 202 to a certain extent.

It should be noted that, the first insulating layer 203, the positive electrode row 205, the negative electrode row 206, and the third insulating layer are all provided with hole structures corresponding to and communicating with the glue overflow holes 2027. So as to facilitate the overflow of the foaming glue.

As shown in fig. 10, 11, and 12, the anode row 206 includes a third main body 2041, and the same side of the third main body 2041 is provided with a cathode module 2042 and an anode module 2043. The positive electrode module 2042 is used to connect with the positive electrode terminal of one of the battery modules 101, and the negative electrode module 2043 is used to connect with the negative electrode terminal of another battery module 101 adjacent to the battery module 101, so as to connect the two battery modules 101 adjacently arranged in series. In this embodiment, the structure of the positive electrode module 2042 is identical to the structure of the input end of the first body 2054 of the positive electrode row 205. Accordingly, the anode module 2043 is configured to conform to the configuration of the input end of the second body 2065 of the anode row 206. And will not be described in detail herein.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (17)

1. A bus bar assembly, comprising:

a connection row (202), wherein the connection row (202) is arranged on one battery module (101) and is used for connecting two single batteries (102) adjacently arranged along a first direction in series in the first direction and connecting two single batteries (102) adjacently arranged along a second direction in parallel in the second direction;

the series connection row (204) is laid on the upper side of the connection row (202) and is used for connecting two adjacent battery modules (101) in series to form a battery pack (100);

the positive electrode row (205) is connected to the positive electrode output end of the battery pack (100), and the positive electrode row (205) is laid on the top of the battery pack (100); and

and the negative electrode row (206) is connected to the negative electrode output end of the battery pack (100), and the negative electrode row (206) is paved on the top of the battery pack (100).

2. The busbar assembly according to claim 1, further comprising a first insulating layer (203), the first insulating layer (203) being between the series row (204), the positive electrode row (205) and the negative electrode row (206) and the connection rows (202) respectively corresponding thereto.

3. The busbar assembly according to claim 2, wherein the first insulating layer (203) is a plastic insulating plate, and the series bar (204), the positive bar (205) and the negative bar (206) are all laid on an upper surface of the plastic insulating plate.

4. A busbar assembly according to claim 2 or 3, wherein the thickness of the first insulating layer (203) is not more than 2mm.

5. A busbar assembly according to claim 2 or 3, wherein a plurality of first glue injection openings (207) are formed in the first insulating layer (203) in a penetrating manner, and the first glue injection openings (207) are communicated with gaps between two adjacent single cells (102) which are arranged along the first direction and correspond to the first glue injection openings.

6. The busbar assembly according to claim 1, further comprising a second insulating layer (201), wherein the second insulating layer (201) is disposed on the upper and lower sides of the connection rows (202) in a fitting manner, and is used for fixing all the connection rows (202) corresponding to the same battery module (101) or fixing all the battery modules (101) corresponding to all the connection rows (202);

the second insulating layer (201) is provided with an operation hole (209), and the connection row (202) is at least partially exposed through the operation hole (209) so as to be connected to the corresponding single battery (102).

7. The busbar assembly of claim 1, wherein the thickness of the positive electrode row (205) and the negative electrode row (206) is no greater than 1mm.

8. The busbar assembly of claim 1 or 7, wherein the positive electrode row (205) and the negative electrode row (206) are sheet material rows.

9. The busbar assembly of claim 8, wherein the positive electrode row (205) and the negative electrode row (206) are aluminum sheet bars or copper sheet bars.

10. The busbar assembly according to claim 1, wherein the positive electrode row (205) comprises a first body (2054), an input end of the first body (2054) is configured with a first extension (2052), an end of the first extension (2052) is configured with a first positive electrode portion (2051), and the first positive electrode portion (2051) is connected to a positive electrode end of the unit cells (102) of a positive electrode output end of the battery pack (100).

11. The busbar assembly according to claim 10, wherein the first extension (2052) is provided with a first weakening hole (2053) therethrough.

12. The busbar assembly according to claim 1, wherein the negative electrode row (206) comprises a second body (2065), an input end of the second body (2065) being provided with a second extension (2062), an end of the second extension (2062) being provided with a first negative electrode portion (2061), the first negative electrode portion (2061) being connected to a negative electrode end of the unit cells (102) of a negative electrode output end of the battery pack (100).

13. The busbar assembly according to claim 12, wherein the second extension (2062) is provided with a second weakening hole (2063) therethrough.

14. The busbar assembly of claim 1, wherein the outer sides of the series bar (204), the positive bar (205) and the negative bar (206) are each covered with a third insulating layer;

the connection ends of the serial connection row (204), the positive electrode row (205) and the negative electrode row (206) are exposed out of the third insulating layer.

15. The busbar assembly according to claim 5, wherein a second glue injection port (208) in corresponding communication with the first glue injection port (207) is provided on each of the positive electrode row (205) and the negative electrode row (206);

and a third glue injection port (2024) which is correspondingly communicated with the first glue injection port (207) is arranged on the connecting row (202).

16. The busbar assembly according to claim 1, wherein the connecting row (202) is provided with glue overflow holes (2027);

hole structures which are correspondingly communicated with the glue overflow holes (2027) are arranged on the positive electrode row (205) and the negative electrode row (206).

17. A battery pack comprising the busbar assembly of any one of claims 1-16.