CN115172996A

CN115172996A - Battery pack with CCS assembly

Info

Publication number: CN115172996A
Application number: CN202210805786.9A
Authority: CN
Inventors: 任朝举; 张国江; 江吉兵; 徐宇虹
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2022-10-11
Also published as: WO2024008195A1

Abstract

The invention belongs to the technical field of batteries, and discloses a battery pack with a CCS assembly. The CCS assembly comprises a support and a plurality of busbars, the busbars are provided with a positive electrode connecting portion and a negative electrode connecting portion, and the busbars are used for electrically connecting a plurality of battery cores to form a battery core group. The support includes the end plate, is provided with a plurality of busbar installation positions on the first plane of end plate, is provided with a plurality of electric core installation positions on the second plane of end plate, has seted up positive intercommunicating pore and negative pole intercommunicating pore on every electric core installation position, and the positive pole of electric core passes through the positive pole connecting portion electricity of positive intercommunicating pore and a busbar and is connected, and the negative pole of this electric core passes through the negative pole intercommunicating pore and the negative pole connecting portion electricity of another busbar and connects, keeps apart through the bead insulation between positive intercommunicating pore and the negative pole intercommunicating pore. The support in this battery package can realize the location of busbar and electric core, effectively prevents that the battery package from taking place the short circuit because of the contact of adjacent busbar.

Description

Battery pack with CCS assembly

Technical Field

The invention relates to the technical field of batteries, in particular to a battery pack with a CCS assembly.

Background

The power battery has the advantages of long service life, high safety performance, large capacity and the like, and becomes a power source of various tools. The battery module is the energy storage unit of power battery package, through carrying out the modularization with a plurality of electric cores, can make things convenient for subsequent installation and use.

The battery pack comprises a CCS assembly (battery module collection integrated component), and the CCS assembly is used as a core part of a battery safety monitoring center and plays a vital role in the safety performance of the battery pack. Current CCS subassembly mainly comprises backup pad and busbar, and in the assembling process of backup pad and busbar, the problem of busbar dislocation appears easily, if contact after the busbar dislocation, then can lead to the problem emergence of electric core short circuit.

Therefore, it is desirable to provide a battery pack having a CCS assembly to solve the above problems.

Disclosure of Invention

The invention aims to provide a battery pack with a CCS assembly, wherein a bracket in the battery pack can realize the positioning of bus bars and battery cells, and effectively prevent the battery pack from short circuit caused by the contact of adjacent bus bars.

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

a battery pack having a CCS assembly, the CCS assembly comprising:

the bus bars are provided with a positive electrode connecting part and a negative electrode connecting part and are used for electrically connecting a plurality of electric cores to form an electric core group;

the support, the support includes the end plate, be provided with a plurality of busbar installation positions on the first plane of end plate, be provided with a plurality of electric core installation positions on the second plane of end plate, every anodal intercommunicating pore and negative pole intercommunicating pore have been seted up on the electric core installation position, the positive pole of electricity core passes through anodal intercommunicating pore and one the busbar anodal connecting portion electricity is connected, and should the negative pole of electricity core passes through negative pole intercommunicating pore and another the busbar the negative pole connecting portion electricity is connected, anodal intercommunicating pore with through the bead insulation isolation between the negative pole intercommunicating pore.

Optionally, a thermally conductive adhesive is disposed on the CCS assembly.

Optionally, the bracket is provided with a glue passing hole, and the heat-conducting glue can contact with the end face of the battery cell through the glue passing hole.

Optionally, the top of each electrical core is provided with the glue passing hole, and the areas of the glue passing holes on the top of each electrical core are the same.

Optionally, the positive communication hole and the negative communication hole above each of the battery cells are disposed along a first direction, two glue passing holes are disposed above each of the battery cells, and the two glue passing holes are symmetrically disposed with respect to the first direction.

Optionally, a liquid cooling plate is arranged above the heat conducting glue.

Optionally, the battery pack with the CCS assembly further comprises a serial bus bar, the number of the electric core groups is multiple, and the electric core groups are connected in series through the serial bus bar.

Optionally, each electric core group is connected with a sampling circuit board, and the sampling circuit board is electrically connected with the bus bar.

Optionally, the sampling circuit board is arranged on the side surface of the electric core group.

Optionally, the busbar has a first connecting portion connected to a nickel plate, and the sampling circuit board has a second connecting portion electrically connected to the nickel plate via a terminal crimping line.

Optionally, two first edges that the end plate is relative are connected with a first curb plate, the first curb plate with the end plate sets up perpendicularly, and the orientation the bottom direction of electric core extends, the sampling circuit board set up in the outside of first curb plate and with first curb plate laminating setting.

Optionally, the battery pack with a CCS assembly further includes a detection element, the detection element is connected to the first side plate, and the detection element is electrically connected to the sampling circuit board.

Optionally, the edge of first curb plate is connected with the fixed part, the fixed part orientation the direction of electricity core bottom extends, detecting element fixes on the fixed part.

Has the advantages that:

the battery pack with the CCS assembly provided by the invention is provided with a plurality of busbars to electrically connect a plurality of battery cells. Through setting up the support to set up busbar installation position on the first plane of support, set up electric core installation position on the second plane, thereby with busbar and electric core location installation. The bracket is provided with a positive electrode communication hole and a negative electrode communication hole, so that the positive electrode of the battery cell can be electrically connected with the positive electrode connecting part of the bus bar through the positive electrode communication hole, and the negative electrode of the battery cell can be electrically connected with the negative electrode connecting part of the other bus bar through the negative electrode communication hole. In addition, the convex ribs are arranged between the positive electrode communication hole and the negative electrode communication hole, so that the adjacent bus bars can be well insulated, and the electrical connection between the positive electrode and the negative electrode of a single battery cell caused by the contact of the bus bars is prevented, thereby causing the short circuit inside the battery pack.

Drawings

FIG. 1 is a schematic diagram of a CCS assembly provided by the present invention;

FIG. 2 is a schematic view of a portion of the structure at A in FIG. 1;

fig. 3 is an exploded view of a partial structure of a battery pack provided by the present invention;

fig. 4 is an assembly schematic of the bus bar and the sampling circuit board provided by the present invention.

In the figure:

10. an electric core; 100. a bus bar; 110. a positive electrode connecting part; 120. a negative electrode connecting part; 130. a substrate; 140. a first connection portion; 200. a support; 210. an end plate; 211. a rib; 212. passing through a glue hole; 220. a first side plate; 221. a fixed part; 222. a support portion; 230. a second side plate; 310. a serial bus; 320. a positive output bus bar; 330. a negative output bus bar; 400. sampling the circuit board; 410. a nickel sheet; 420. a second connecting portion; 500. and (4) liquid cooling the plate.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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, 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. 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 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 and 2, the present embodiment provides a battery pack having a CCS assembly, wherein the CCS assembly includes a bracket 200 and a plurality of bus bars 100, a positive electrode connecting portion 110 and a negative electrode connecting portion 120 are disposed on the bus bars 100, and the bus bars 100 are used for electrically connecting a plurality of battery cells 10 to form a battery core group. The support 200 includes an end plate 210, a plurality of bus bar installation positions are disposed on a first plane of the end plate 210, a plurality of battery cell installation positions are disposed on a second plane of the end plate 210, each battery cell installation position is provided with a positive electrode communication hole and a negative electrode communication hole, a positive electrode of a battery cell 10 is electrically connected to a positive electrode connection portion 110 of one bus bar 100 through the positive electrode communication hole, a negative electrode of the battery cell 10 is electrically connected to a negative electrode connection portion 120 of another bus bar 100 through the negative electrode communication hole, and the positive electrode communication hole and the negative electrode communication hole are isolated from each other through a protruding rib 211.

The battery pack having the CCS assembly electrically connects the plurality of battery cells 10 by providing the plurality of bus bars 100. Through setting up support 200 to set up busbar installation position on the first plane of support 200, set up electric core installation position on the second plane, thereby fix a position the installation with busbar 100 and electric core 10. The holder 200 is provided with a positive electrode communication hole and a negative electrode communication hole, so that a positive electrode of the battery cell 10 can be electrically connected to the positive electrode connection part 110 of the bus bar 100 through the positive electrode communication hole, and a negative electrode of the battery cell 10 can be electrically connected to the negative electrode connection part 120 of the other bus bar 100 through the negative electrode communication hole. In addition, the convex rib 211 is arranged between the positive communicating hole and the negative communicating hole, which can play a good insulating role for the adjacent bus bars 100, and prevent the positive electrode and the negative electrode of a single battery cell 10 from being electrically connected due to the contact of the bus bars 100, thereby causing the short circuit inside the battery pack.

It is understood that the bracket 200 should be made of an insulating material, and alternatively, the bracket 200 may be made of plastic. The outer contour of the stent 200 in this embodiment is rectangular, having long sides and short sides. In the present embodiment, the extending direction of the long side of the holder 200 is defined as the first direction.

Referring to fig. 1 and 2, each of the busbars 100 in the present embodiment includes a plurality of busbar units connected by a base material 130, and each of the busbars 100 has a first connection portion 140 at an end thereof. Each of the bus bar cells includes a positive electrode connection portion 110 and a negative electrode connection portion 120 connected to each other, i.e., each of the bus bar cells is capable of connecting two battery cells 10 in series. Optionally, a plurality of busbar monomers are connected in a wave shape through the base material 130, so that the electric core 10 below the busbar 100 is arranged in a staggered manner, the purpose of fully utilizing the internal space of the battery pack is achieved, and the battery pack is ensured to have higher energy density.

Further, the battery pack further comprises a serial bus bar 310, the number of the electric core groups is multiple, and the electric core groups are connected in series through the serial bus bar 310. After the plurality of electric core groups are connected in series, the positive pole of the electric core groups is provided with a positive pole output bus bar 320, and the negative pole of the electric core groups is provided with a negative pole output bus bar 330. The bus bar 100 is a thin copper bar with the thickness of 0.3mm, and the serial bus bar 310, the positive output bus bar 320 and the negative output bus bar 330 are variable-section copper bars and are formed by welding copper sheets with the thickness of 0.3mm and 2mm, so that the overcurrent requirement can be met, and the space can be saved.

The CCS assembly is provided with a thermally conductive paste (not shown). Heat-conducting glue lays on the surface of support 200 and busbar 100, on the one hand, heat-conducting glue can bond support 200 and busbar 100, guarantee that both positions do not take place relative movement, the rigidity and the stability of structure have been increased, on the other hand, the battery is at the charge-discharge in-process, busbar 100 local heat generation is serious, heat-conducting glue set up can be with busbar 100 heat transfer to the lower position of temperature, avoid the inside local high temperature of battery package, cause potential safety hazards such as electric core 10 thermal runaway.

With continued reference to fig. 2, the bracket 200 is provided with a mounting groove, the bus bar 100 is disposed in the mounting groove, and the mounting hole is disposed at the bottom surface of the mounting groove. Alternatively, the height of the mounting groove is greater than the thickness of the bus bar 100, so that the heat conductive glue can fill the surface of the bus bar 100, and the bus bar 100 is covered under the heat conductive glue, which can also improve the heat transfer effect and increase the firmness of the connection between the components.

Further, the bracket 200 is provided with a glue through hole 212, and the heat conducting glue can contact the end surface of the electrical core 10 through the glue through hole 212. The heat-conducting glue can be filled in the glue passing hole 212 and directly contacts with the battery cell 10, so that the heat transfer effect of the heat-conducting glue can be fully exerted, the heat of the battery cell 10 can be rapidly dispersed, and the phenomenon of thermal runaway of the battery cell 10 can be prevented. Optionally, the top of heat conduction glue still is provided with liquid cooling board 500, is provided with the liquid cooling passageway on the liquid cooling board 500, is provided with inlet and liquid outlet on the terminal surface of liquid cooling board 500, and through letting in the coolant liquid to the inlet, the coolant liquid flows out from the liquid outlet behind the liquid cooling passageway, reaches the effect to battery package cooling.

Further, the positive electrode communication hole and the negative electrode communication hole above each battery cell 10 are arranged along the first direction, two glue passing holes 212 are arranged above each battery cell 10, and the two glue passing holes 212 are symmetrically arranged relative to the first direction. It can be understood that the shapes of the glue through holes 212 may be set according to the shapes of the end surface of the battery cell 10 and the bus bar 100, and two glue through holes 212 on a single battery cell 10 have the same shape, which may ensure balanced temperature of the end surface of the battery cell 10 and prevent local over-temperature. Of course, in other embodiments, the shape of the glue passing hole 212 may also be a circle, a square, a polygon, etc., and is not limited herein.

Further, the top of each battery cell 10 is provided with the glue passing hole 212, and in one embodiment, the area of the glue passing hole 212 at the top of each battery cell 10 is the same, that is, the area of direct contact between each battery cell 10 and the heat conducting glue is the same, so that the top of each battery cell 10 has the same heat dissipation capability, and further, it is ensured that all the battery cells 10 in the battery pack have the same temperature, the temperature in the whole battery pack is balanced, and the over-high temperature of the local battery cells 10 is avoided.

Further, referring to fig. 2 and 3, a sampling circuit board 400 is connected to each cell group, and the sampling circuit board 400 is electrically connected to the bus bar 100. Alternatively, the sampling circuit board 400 may be a flexible flat cable. In order to save space and reduce quality and cost, the battery pack is often electrically connected to each battery cell 10 by using a flexible flat cable and sampling is performed. The flexible flat cable is a flexible electronic component, also called as FFC, and is a novel data cable formed by laminating a PET (Polyethylene terephthalate) insulating material and an extremely thin tin-plated flat copper wire through a high-tech automation equipment production line. The novel wire connector has the advantages of small volume, high density, strong function, low process difficulty and stable quality, and the quantity and the distance of wires can be freely selected to meet various connection requirements.

Further, referring to fig. 2 to 4, the first connection part 140 of the busbar 100 is connected with a nickel plate 410, and the sampling circuit board 400 has a second connection part 420, and the second connection part 420 and the nickel plate 410 are electrically connected by a terminal crimping line. The connecting mode of the terminal pressing line is a conductive connecting mode commonly used in the field, and the type of the terminal can be selected according to the use requirement. Since the bus bar 100 is electrically connected to the battery cell 10, after the sampling circuit board 400 is electrically connected to the bus bar 100 through the terminal crimping line, the battery cell 10 can be sampled by the sampling circuit board 400. In other embodiments, the sampling circuit board 400 may be welded to the bus bar 100 by laser welding, so that the sampling circuit board 400 is electrically connected to the bus bar 100.

Further, the sampling circuit board 400 is disposed at a side of the electric core pack. Through setting up sampling circuit board 400 in the side of electric core group, can avoid sampling circuit board 400 to influence the heat dissipation of electric core 10 top and busbar 100 to effectively avoid the battery package internal temperature too high to cause the phenomenon emergence of electric core 10 thermal runaway. In addition, since the sampling circuit board 400 is disposed at the side of the electric core pack, the space occupied in the height direction of the battery pack is reduced. Simultaneously, heat-conducting glue can directly contact with the top of the battery core 10, and the heat of the battery core 10 and the busbar 100 is directly transmitted to the liquid cooling plate 500 through the heat-conducting glue without passing through the sampling circuit board 400, so that the battery pack has a good heat dissipation effect and can effectively reduce the risk of thermal runaway caused by the overhigh temperature of the battery core 10.

Further, two opposite first edges of the end plate 210 are connected with a first side plate 220, the first side plate 220 and the end plate 210 are vertically arranged and extend toward the bottom direction of the electric core 10, and the sampling circuit board 400 is arranged outside the first side plate 220 and is attached to the first side plate 220. In the present embodiment, the first edge refers to the long side of the end plate 210, and the sampling circuit board 400 and the end plate 210 are vertically disposed. The first side plate 220 is arranged to limit the sampling circuit board 400, so as to ensure the position of the sampling circuit board 400 on the side of the cell pack. Optionally, a supporting portion 222 may be disposed at a lower edge of the first side plate 220 to limit the sampling circuit board 400. In this embodiment, the supporting portion 222 is a rectangular sheet-shaped structure extending toward the bottom of the battery cell 10, and the outer side of the supporting portion is flush with the outer side of the first side plate 220. In other embodiments, the shape of the support portion 222 may be set as needed. The second edge of the end plate 210 (the short side of the end plate 210) is also connected with a connector, and the connector can be electrically connected with the sampling circuit board 400 by means of plugging, laser welding or terminal pressing lines, and is used for connecting with a battery management system. Alternatively, a second side plate 230 is attached to the second edge, the second side plate 230 is perpendicularly attached to the end plate 210, and the connector is disposed on the second side plate 230.

Further, the battery pack further includes a detection element, the detection element is connected to the first side plate 220, and the detection element is electrically connected to the sampling circuit board 400. The detection element may be a temperature sensor or a pressure sensor or other components for sampling the battery cells 10. Optionally, a fixing portion 221 is connected to an edge of the first side plate 220, the fixing portion 221 extends toward the bottom of the battery cell 10, and the detecting element is fixed to the fixing portion 221. The fixing portions 221 are provided in plural numbers, and the plural fixing portions 221 are provided at intervals along the long side of the first side plate 220. Detection element in this embodiment is water droplet hair style temperature sensor, adopts terminal crimping mode and sampling circuit board 400 to connect, and traditional welded connection is compared to this kind of connected mode, and it is higher to have the reliability, and technology is simpler, the better advantage of economic nature. The temperature of the highest region of temperature in whole electric core group can be reflected to battery temperature acquisition requirement, and is high to the design requirement, and through the emulation result, the high temperature region all is located electric core from the up 1/3 position department in bottom, and fixed part 221 is used for fixing water droplet hair style temperature sensor in suitable position, can guarantee the precision of gathering the position, can also protect water droplet hair style temperature sensor simultaneously.

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. And are neither required nor 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 pack having a CCS assembly, the CCS assembly comprising:

the battery pack comprises a plurality of busbars (100), wherein positive electrode connecting parts (110) and negative electrode connecting parts (120) are arranged on the busbars (100), and the busbars (100) are used for electrically connecting a plurality of battery cores (10) to form a battery core group;

support (200), support (200) include end plate (210), be provided with a plurality of busbar installation positions on the first plane of end plate (210), be provided with a plurality of electric core installation positions on the second plane of end plate (210), every anodal intercommunicating pore and negative pole intercommunicating pore have been seted up on the electric core installation position, the positive pole of electricity core (10) passes through anodal intercommunicating pore and one busbar (100) anodal connecting portion (110) electricity is connected, and this the negative pole of electricity core (10) passes through negative pole intercommunicating pore and another busbar (100) negative pole connecting portion (120) electricity is connected, anodal intercommunicating pore with through bead (211) insulating isolation between the negative pole intercommunicating pore.

2. The battery pack with a CCS assembly of claim 1, wherein the CCS assembly has a thermally conductive glue disposed thereon.

3. The battery pack with the CCS assembly according to claim 2, wherein the bracket (200) is provided with a glue hole (212), and the thermal conductive glue can contact with the end surface of the electric core (10) through the glue hole (212).

4. The battery pack with the CCS assembly of claim 3, wherein the glue holes (212) are formed in the top of each battery cell (10), and the glue holes (212) in the top of each battery cell (10) are the same in area.

5. The battery pack with the CCS assembly according to claim 3, wherein the positive communication hole and the negative communication hole above each of the battery cells (10) are arranged along a first direction, two glue passing holes (212) are arranged above each of the battery cells (10), and the two glue passing holes (212) are symmetrically arranged with respect to the first direction.

6. The battery pack with the CCS assembly according to any one of claims 2 to 5, wherein a liquid cooling plate (500) is disposed above the heat conductive glue.

7. The battery pack with the CCS assembly according to any one of claims 1 to 5, wherein the battery pack with the CCS assembly further comprises a plurality of serial bus bars (310), and the plurality of the electric core groups are connected in series through the serial bus bars (310).

8. The battery pack with the CCS assembly according to any one of claims 1 to 5, wherein a sampling circuit board (400) is connected to each of the electric core groups, and the sampling circuit board (400) is electrically connected to the bus bar (100).

9. The battery pack with the CCS assembly of claim 8, the sampling circuit board (400) is disposed at a side of the battery cell pack.

10. The battery pack with the CCS assembly according to claim 8, the busbar (100) having a first connection portion (140), a nickel plate (410) being connected to the first connection portion (140), the sampling circuit board (400) having a second connection portion (420), the second connection portion (420) being electrically connected to the nickel plate (410) by a terminal crimping line.

11. The battery pack with the CCS assembly according to claim 8, wherein a first side plate (220) is connected to two first edges of the end plate (210), the first side plate (220) and the end plate (210) are vertically arranged and extend towards the bottom direction of the battery core (10), and the sampling circuit board (400) is arranged outside the first side plate (220) and attached to the first side plate (220).

12. The battery pack with CCS assembly according to claim 11, further comprising a sensing element attached to the first side plate (220), the sensing element being electrically connected to the sampling circuit board (400).

13. The battery pack with a CCS assembly according to claim 12, wherein a fixing part (221) is connected to an edge of the first side plate (220), the fixing part (221) extends towards the bottom of the battery cell (10), and the detecting element is fixed on the fixing part (221).