CN219321567U - Battery cell module and battery pack - Google Patents

Abstract

The utility model relates to a battery cell module and a battery pack, wherein the battery cell module comprises a shell, a bus bracket and a battery cell unit, the shell is provided with a containing cavity, the bus bracket and the battery cell unit are arranged in the containing cavity, the bus bracket comprises an insulating part, a heat conducting part and a bus bar, the heat conducting part is arranged on the insulating part, the heat conducting part is connected with the shell, the heat conducting part is clamped between the insulating part and the bus bar, so that the bus bar can exchange heat between the heat conducting part and the shell, and the battery cell unit is provided with a tab which is electrically connected with the bus bar. When the battery cell module charges and discharges, heat generated by the electrode lugs and the bus bars can be conducted onto the shell through the heat conducting piece, and heat exchange is carried out between the larger heat radiating surface of the shell and the external heat radiating part or external air to realize cooling and heat radiation, so that the temperature of the bus bars and the electrode lug positions can be effectively reduced, and the situation that the use safety of the battery cell module is influenced due to overhigh temperature of the bus bars and the electrode lug positions is avoided.

Description

Battery cell module and battery pack

Technical Field

The present disclosure relates to battery manufacturing, and particularly to a battery module and a battery pack including the battery module.

Background

With the rapid development of new energy power, a power battery has become a main direction of development of electric automobiles. The prior power battery mainly comprises a box body and a plurality of battery cell modules arranged in the box body, wherein each battery cell module comprises a shell and a plurality of battery cell monomers arranged in the shell. And a bus bracket is also arranged in the shell, and the lugs of the battery core monomers are all connected to the bus bracket so as to realize the bus of the circuit and enable the battery core monomers in the shell to be electrically connected with external equipment through the bus bracket. In order to improve the charging rate of the electric automobile, more and more battery cell monomers adopt a quick charging design. However, when the battery cell monomer is charged quickly, a large amount of heat is generated in the tab area of the battery cell monomer and the busbar area with the conductive function in the busbar bracket, so that the temperature of the busbar area and the tab area is too high, and the use safety of the whole battery cell module is affected.

Disclosure of Invention

The utility model aims to provide a battery cell module which can conduct heat on a confluence bracket to a shell and has good heat dissipation effect.

Another object of the present utility model is to provide a battery pack that is highly safe in use.

To achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a pair of electric core module, including casing, the support of converging and electric core monomer, the casing has the chamber of holding, and the support of converging and electric core monomer all set up in holding the intracavity, and the support of converging includes the insulating part and sets up heat conduction spare and the busbar on the insulating part, and the heat conduction spare is connected with the casing, and the heat conduction spare presss from both sides locates between insulating part and the busbar, and electric core monomer has the utmost point ear, utmost point ear and busbar electric connection.

Further, the insulating piece is provided with a first side face and a second side face which are opposite, the insulating piece is provided with a through hole in a penetrating mode, the busbar is arranged on the first side face of the insulating piece, the battery cell unit is arranged on the second side face of the insulating piece, and the electrode lugs penetrate through the through hole to be connected with the busbar.

Further, the heat conducting piece is a metal plate, and a heat conducting silicon sheet is clamped between the heat conducting piece and the busbar.

Further, the bus bracket further comprises a mounting nail, and the mounting nail sequentially penetrates through the bus bar and the heat conducting piece to be connected with the insulating piece.

Further, the mounting nail comprises a nail rod part and a nail head part, the nail rod part is connected with the insulating piece, the nail head part is arranged at one end of the nail rod part, which is away from the insulating piece, the diameter of the nail head part is larger than that of the nail rod part, and a counter bore for accommodating the nail head part is formed in the busbar.

Further, two mounting nails are arranged on the bus at intervals, and a welding area for welding the tab is formed between the two mounting nails.

Further, the busbar is a plurality of, and a plurality of busbars are followed the length direction interval setting of insulating part, all are provided with the heat conduction spare between every busbar and the insulating part.

Further, the heat conducting piece comprises a first plate and a second plate which are arranged at an included angle, the first plate is clamped between the busbar and the insulating piece, and the second plate is connected with the shell.

Further, both ends of the length direction of the first plate are provided with second plates, and the two second plates are respectively connected with two cavity walls opposite to the accommodating cavity.

Further, the busbar, the heat conducting piece and the insulating piece are sequentially bonded and fixed.

The battery pack comprises a box body and at least one battery cell module, wherein the at least one battery cell module is arranged in the box body.

Compared with the prior art, the utility model has the beneficial effects that: the heat conducting member is sandwiched between the busbar and the insulating member, and is connected to the housing. When the battery cell module charges and discharges, heat generated by the electrode lugs and the bus bars can be conducted onto the shell through the heat conducting piece, and heat exchange is carried out between the larger heat radiating surface of the shell and the external heat radiating part or external air to realize cooling and heat radiation, so that the temperature of the bus bars and the electrode lug positions can be effectively reduced, and the situation that the use safety of the battery cell module is influenced due to overhigh temperature of the bus bars and the electrode lug positions is avoided.

Drawings

The utility model is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic view of a bus bar bracket according to an embodiment of the utility model.

Fig. 2 is an exploded view of a confluence bracket according to an embodiment of the present utility model.

Fig. 3 is a top view of a bus bar bracket according to an embodiment of the utility model.

Fig. 4 is a partial cross-sectional view of a battery cell module according to an embodiment of the utility model.

Fig. 5 is a partial cross-sectional view of a buss bar bracket according to an embodiment of the present utility model.

In the figure:

1. a confluence bracket; 11. an insulating member; 110. avoidance holes; 12. a heat conductive member; 121. a first plate; 122. a second plate; 13. a thermally conductive silicone sheet; 14. a busbar; 141. countersink; 142. a welding area; 15. installing nails; 151. a stapling head; 16. a connection terminal; 2. a housing; 21. a top plate; 22. a bottom plate; 23. and a side plate.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

Example 1

As shown in fig. 1 to 5, the present utility model provides a cell module, which includes a housing 2, a bus bar 1, and a cell unit (not shown). The battery cell unit is used for storing electric energy, and is provided with two lugs which are used for being electrically connected with external equipment, wherein the two lugs are respectively a positive lug and a negative lug. The shell 2 is of a cuboid structure, and the shell 2 plays a role in installing and protecting the battery cell monomers. The housing 2 includes a top plate 21, a bottom plate 22, and four side plates 23. The top plate 21 and the bottom plate 22 are arranged in parallel and at intervals along the height direction of the casing 2, wherein two side plates 23 are arranged in parallel and at intervals along the length direction of the casing 2, the other two side plates 23 are arranged in parallel and at intervals along the width direction of the casing 2, and a containing cavity is formed by enclosing the top plate 21, the bottom plate 22 and the four side plates 23. The electric core monomers are arranged in the accommodating cavity, the electric core monomers are arranged in a plurality, the electric core monomers are sequentially arranged along the first direction (the X direction in the figure), the electric core bracket 1 is positioned at one end of the shell 2 in the second direction (the Y direction in the figure), and one ends of all the electric core monomers are connected with the electric core bracket 1. The bus bar bracket 1 includes an insulating member 11 made of an insulating material, a heat conductive member 12 made of a heat conductive material, and a bus bar 14 made of an electrically conductive material. The insulating piece 11 plays a role in integral support, and one end of the battery cell unit is fixedly connected with the insulating piece 11. The heat conducting member 12 is sandwiched between the insulating member 11 and the bus bar 14, the end of the heat conducting member 12 is connected with the housing 2, and the tab of the battery cell is electrically connected with the bus bar 14.

It will be appreciated that when the cell module is charged and discharged, particularly rapidly, a large amount of heat is generated by the tabs and the buss bars 14, which in turn causes the temperature of the tabs and the buss bars 14 to rise. Since the heat conducting member 12 is sandwiched between the bus bar 14 and the insulating member 11, the heat conducting member 12 has good heat conducting performance, so that heat on the bus bar 14 and the tab can be conducted to the housing 2 through the heat conducting member 12, thereby realizing heat exchange between the bus bar bracket 1 and the housing 2. The shell 2 has a larger radiating surface, and corresponding radiating components can be arranged outside the shell 2, so that the cooling and radiating of the confluence bracket 1 are facilitated.

Alternatively, referring to fig. 4, the bus bar 1 is provided adjacent to one end of the housing 2 in the second direction. The insulator 11 is disposed opposite one of the side plates 23 of the housing 2. Along the thickness direction (Y direction in the drawing) of the insulating member 11, the insulating member 11 has opposite first and second side surfaces, the first side surface of the insulating member 11 facing the side plate 23, and the second side surface of the insulating member 11 facing the cell unit. Both ends of the heat conductive member 12 are connected to the top plate 21 and the bottom plate 22 of the housing 2, respectively.

Alternatively, referring to fig. 2 and 5, the heat conductive member 12 includes a first plate 121 and a second plate 122 disposed perpendicular to each other, two of the second plates 122 being disposed at both ends of the first plate 121 in the longitudinal direction, respectively. The first plate 121 is sandwiched between the bus bar 14 and the insulating member 11, and the two second plates 122 are respectively connected to two chamber walls opposite to the accommodating chamber. Specifically, the two second plates 122 are respectively attached to the top plate 21 and the bottom plate 22 of the housing 2, and welded and fixed between the second plates 122 and the top plate 21 and between the second plates 122 and the bottom plate 22.

Alternatively, referring to fig. 3, the bus bar 1 further includes two connection terminals 16, and the two connection terminals 16 are located at both ends of the bus bar 1 in the length direction, respectively. The bus bar 14 is electrically connected with the connection terminal 16 so that the bus bar holder 1 can be connected with external devices through the connection terminal 16.

The remarkable effects of this embodiment are: the heat conductive member 12 is interposed between the bus bar 14 and the insulating member 11, and the heat conductive member 12 is connected to the housing 2. When the battery cell module is charged and discharged, heat generated by the electrode lugs and the bus bar 14 can be conducted onto the shell 2 through the heat conducting piece 12, and heat exchange is carried out between a larger heat radiating surface of the shell 2 and an external heat radiating part or external air to realize cooling and heat radiation, so that the temperature of the bus bar 14 and the electrode lug position can be effectively reduced, and the situation that the use safety of the battery cell module is influenced due to overhigh temperature of the bus bar 14 and the electrode lug position is avoided.

Example two

Referring to fig. 5, the present embodiment provides a battery cell module similar to the first embodiment, except that the heat conducting member 12 is a metal plate in the bus bar 1. The metal plate has good heat conduction performance and good mechanical strength, and can play a role in heat conduction and a role in supporting the whole bus bracket 1. The material of the heat conductive member 12 may be aluminum, copper, tin, iron, etc., without limitation. Since the metal plate has electrical conductivity, the thermally conductive silicone sheet 13 is sandwiched between the thermally conductive member 12 and the bus bar 14. The heat conduction silica gel piece 13 plays an insulating and heat conduction role, and the bus bar 14 is insulated and isolated by the heat conduction silica gel piece 13, so that the conduction between the electrode lug and the shell 2 is avoided. At the same time, the heat on the bus bar 14 can be conducted to the heat conducting member 12 through the heat conducting silicone sheet 13. Of course, in other embodiments, when the heat conductive member 12 is made of an insulating material, the heat conductive silicone sheet 13 may be omitted so that the heat conductive member 12 is in direct contact with the bus bar 14.

The bus bar bracket 1 further includes a mounting nail 15, the mounting nail 15 playing a fastening role, and the bus bar 14, the heat conductive silicone sheet 13 and the heat conductive member 12 are all fixed on the first side surface of the insulating member 11 by the mounting nail 15. The mounting nails 15 sequentially pass through the bus bar 14, the heat-conducting silicon sheet 13 and the heat-conducting member 12 and are fixedly connected with the insulating member 11. The mounting nail 15 includes a shank portion and a head portion 151, the head portion 151 having a diameter greater than the shank portion. In this embodiment, the shank is in a cylindrical structure, the head 151 is in a conical structure, and the small end of the head 151 is connected to the shank. It will also be appreciated that the mounting peg 15 is constructed and functions in the same manner as a screw. Of course, in other embodiments, the busbar 14, the thermally conductive silicone sheet 13, the thermally conductive member 12, and the insulating member 11 are sequentially bonded and fixed. That is, the bus bar 14 and the heat conducting silicon sheet 13 are adhered and fixed, the heat conducting silicon sheet 13 and the heat conducting member 12 are adhered and fixed, and the heat conducting member 12 and the insulating member 11 are adhered and fixed.

The mounting nail 15 is integrally formed with the insulator 11. In practical applications, the nail head 151 may be formed through a hot riveting process or a hot melting process, so that the bus bar 14, the thermally conductive silicone sheet 13, and the thermally conductive member 12 are fixed to the insulating member 11 by the mounting nails 15. Of course, in other embodiments, the mounting nail 15 may be prefabricated, and the mounting nail 15 and the insulating member 11 are separately designed, and the mounting nail 15 and the insulating member 11 are mounted and fixed in a threaded manner.

Optionally, referring to fig. 1, a counterbore 141 for accommodating a nail head 151 is formed on the busbar 14, and the shape of the counterbore 141 is matched with the shape of the nail head 151. When the lug is installed, the nail head 151 can be accommodated in the counter bore 141, so that the surface of the busbar 14 is flat, and the lug is convenient to install.

Alternatively, the bus bar 14 has a rectangular sheet-like structure, and the length direction of the bus bar 14 extends in the width direction of the insulating member 11. The bus bars 14 are a plurality of, and a plurality of bus bars 14 are arranged at intervals along the length direction of the insulating piece 11, and each bus bar 14 and the insulating piece 11 are provided with a heat conducting piece 12 therebetween, and a heat conducting silicon sheet 13 is clamped between the bus bar 14 and the heat conducting piece 12. The specific number of buss bars 14 is adaptively selected based on the number of cell units in order to connect a plurality of cell units in series or parallel together through buss bars 14.

Two counter bores 141 are arranged on each busbar 14, and the two counter bores 141 are distributed at intervals along the length direction of the busbar 14. A welding area 142 for welding the tab is formed between the two counter bores 141. The insulating member 11 is provided with an avoidance hole 110 for penetrating the lug, and the avoidance hole 110 is communicated with the first side surface and the second side surface of the insulating member 11. When the tab is installed, the tab passes through the avoiding hole 110 and is bent and then attached in the welding area 142, and finally the tab is welded and fixed in the welding area 142 in a laser welding mode.

In the present embodiment, the bus bar 1 functions as a circuit bus. The plurality of battery cells are sequentially arranged on the second side of the insulating member 11. In the adjacent two battery core monomers, the positive electrode lug of one battery core monomer and the negative electrode lug of the other battery core monomer are connected on the same bus bar 14. Along the length direction (X direction in the drawing) of the insulating member 11, two bus bars 14 at the end portions are electrically connected to two connection terminals 16, respectively. This structure can realize the series connection of a plurality of battery cells in the housing 2.

In order to make the structure of the bus bar bracket 1 compact and easy to assemble, the first side surface of the insulating member 11 is provided with a groove, and the heat conducting member 12, the heat conducting silicone sheet 13 and the bus bar 14 are sequentially stacked in the groove. Through holes for penetrating the heat conducting piece 13 are formed in two groove walls opposite to the groove, so that two ends of the heat conducting piece 13 can penetrate through the two through holes respectively and are connected with the top plate 21 and the bottom plate 22 of the shell 2.

Example III

As shown in fig. 4, a battery pack is also provided, which includes a case and at least one battery cell module. The inside cavity that is used for holding electric core module that has of box, electric core module are a plurality of, and a plurality of electric core modules set up in the cavity of box. The adjacent two cell modules are electrically connected through the connecting terminal 16 on the bus bracket 1.

It should be noted that at least one of the plurality of cell modules in the case is a cell module provided in the above embodiment, and may also include a cell module having a structure other than the above embodiment. Or, in the plurality of battery cell modules in the box, all the battery cell modules are provided in the above embodiment.

The remarkable effects of this embodiment are: in the operation process of the battery pack, heat on the electrode lugs of the battery core monomers and the electrode lugs 14 is conducted onto the shell 2 through the heat conducting piece 12, and then is conducted to the liquid cooling plate through the heat conducting glue by the shell 2, so that the cooling and heat dissipation of the bus bracket 1 are realized, accidents caused by overhigh temperature of the electrode lugs and the electrode lugs are avoided, and the battery pack has the characteristic of high use safety.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (11)

1. The utility model provides a battery cell module, its characterized in that, includes casing, converging support and electric core monomer, the casing has the chamber of holding, converging support with electric core monomer all set up in hold the intracavity, converging support include the insulating part with set up in heat conduction spare and busbar on the insulating part, the heat conduction spare with the casing is connected, just the heat conduction spare clamp is located the insulating part with between the busbar, electric core monomer has the tab, the tab with busbar electric connection.

2. The battery cell module of claim 1, wherein the insulating member has a first side and a second side opposite to each other, the insulating member is provided with a through hole, the bus bar is disposed on the first side of the insulating member, the battery cell unit is disposed on the second side of the insulating member, and the tab passes through the through hole and is connected with the bus bar.

3. The battery cell module of claim 1, wherein the heat conducting member is a metal plate, and a heat conducting silicon sheet is sandwiched between the heat conducting member and the bus bar.

4. The battery cell module of claim 1, wherein the buss bar bracket further comprises a mounting pin that sequentially passes through the buss bar and the heat conductive member to be connected with the insulating member.

5. The battery cell module of claim 4, wherein the mounting nail comprises a nail stem and a nail head, the nail stem is connected with the insulating member, the nail head is arranged at one end of the nail stem, which is away from the insulating member, the diameter of the nail head is larger than that of the nail stem, and the busbar is provided with a counter bore for accommodating the nail head.

6. The battery cell module of claim 4, wherein two mounting nails are arranged on the bus bar at intervals, and a welding area for welding the tab is formed between the two mounting nails.

7. The battery module according to any one of claims 1 to 6, wherein the number of the bus bars is plural, the plural bus bars are arranged at intervals along the length direction of the insulating member, and the heat conductive member is provided between each of the bus bars and the insulating member.

8. The battery module of any one of claims 1 to 6, wherein the thermally conductive member includes a first plate and a second plate disposed at an angle, the first plate being sandwiched between the bus bar and the insulating member, the second plate being connected to the housing.

9. The battery cell module of claim 8, wherein the second plates are disposed at both ends of the first plate in the length direction, and the two second plates are respectively connected to two cavity walls opposite to the receiving cavity.

10. The battery cell module of claim 1, wherein the buss bar, the thermally conductive member, and the insulating member are sequentially bonded and fixed.

11. A battery pack comprising a housing and at least one cell module according to any one of claims 1 to 10, at least one of said cell modules being disposed in said housing.

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