CN219371116U

CN219371116U - Battery module and battery pack

Info

Publication number: CN219371116U
Application number: CN202223410111.9U
Authority: CN
Inventors: 何亚飞
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-07-18
Anticipated expiration: 2032-12-16

Abstract

The utility model relates to the technical field of battery thermal management, in particular to a battery module and a battery pack, comprising: a frame with a containing space inside; including the electric core stack body of a plurality of electric cores, electric core is equipped with the utmost point ear, and a plurality of electric cores are overlapped along its thickness direction and are set up in the accommodation space of frame, and adjacent electric core is connected through utmost point ear electricity, still including setting up the heat conduction spare between the utmost point ear, the at least partial laminating heat conduction spare of utmost point ear, and the heat conduction spare is connected to the frame at least partially, and the heat conduction spare is with the heat conduction of utmost point ear to the frame. According to the utility model, the heat conducting piece conducts heat generated on the lug to the frame, and the heat is dissipated to the environment through the frame with larger area, so that the heat dissipation efficiency is improved.

Description

Battery module and battery pack

Technical Field

The utility model relates to the technical field of thermal management of power batteries, in particular to a battery module and a battery pack.

Background

At present, the quick charge rate is increased gradually, the heat productivity of the battery is increased gradually, the metal overcurrent piece such as a battery tab is too high along with the increase of current, the too high temperature of the battery tab can directly influence the temperature of the active substance at the root end of the battery connected with the battery tab, the local temperature of the battery is too high, the active substance of the battery is seriously aged, the aluminum plastic film is melted when the temperature of the battery tab is too high, and the safety problems such as battery leakage and the like are caused.

However, the current soft package module only aims at cooling the battery, and no cooling scheme of relevant battery lugs exists.

Disclosure of Invention

Therefore, the utility model aims to overcome the defect that the battery tab is not cooled independently in the prior art, and provides a battery module, namely a battery pack, which can establish a direct heat dissipation path for the battery tab.

In order to solve the above technical problems, the present utility model provides a battery module, comprising: the frame is internally provided with an accommodating space;

the electric core stacking body comprises a plurality of electric cores, each electric core is provided with a lug, the electric cores are overlapped and arranged in the accommodating space of the frame along the thickness direction of the electric core, the adjacent electric cores are electrically connected through the lugs, and

the heat conducting piece, the heat conducting piece set up in between the utmost point ear, utmost point ear is at least partly laminated the heat conducting piece, the heat conducting piece is at least partly connected to the frame, the heat conducting piece will the heat conduction of utmost point ear extremely the frame.

In one embodiment of the utility model, the battery cells are formed by connecting at least two monomers in parallel, the battery cells are isolated by a partition board, adjacent battery cells are connected in series, and the heat conducting piece is arranged between two groups of lugs connected in series.

In one embodiment of the present utility model, the cross section of the heat conducting member is a trapezoid, the short side of the trapezoid faces the inside of the battery cell, and the long side of the trapezoid faces the outside of the battery cell.

In one embodiment of the present utility model, the heat conductive member is a hollow structure, and one end of the heat conductive member is connected to the frame.

In one embodiment of the present utility model, the heat conducting member is a heat pipe, a heat conducting glue, a heat conducting structural glue, a heat conducting pad, a VC pipe, a graphene sheet, or a composite phase change material.

In one embodiment of the utility model, the frame comprises a base plate on which an insulating film is provided, and the heat conductive member is connected to the insulating film.

In one embodiment of the utility model, the frame further comprises a water cooling plate, a water inlet of the water cooling plate is arranged at the side edge of the cell stack body, and the bottom plate is connected with the water cooling plate through heat conduction glue.

In one embodiment of the utility model, a first insulating plate is arranged between the bottom plate and the cell stack body, and a plurality of protrusions are arranged on one side surface of the first insulating plate, which is attached to the cell stack body, so as to correspond to single body positions of the cells.

In one embodiment of the utility model, the frame further comprises an end plate, the thermally conductive member being at least partially connected to the end plate.

A battery pack comprises a shell, a thermal management assembly and a plurality of battery modules.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

the battery module comprises:

1. the heat conduction assembly is used as a heat conduction bridge of the electrode lug, so that the electrode lug is directly cooled, the local overhigh temperature of the battery module is avoided, and the safety of the battery is improved;

2. by setting composite phase change materials with high latent heat value and the like as heat conduction components, heat is stored, and the heat conduction efficiency of the lugs is improved;

3. through the setting of water-cooling board, improve the radiating efficiency of bottom plate, and then improve the radiating efficiency of utmost point ear.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which

FIG. 1 is a schematic view of a structure of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an internal structure of an embodiment of the present utility model;

FIG. 3 is a schematic view of the copper bar structure of the present utility model;

FIG. 4 is a side view of the present utility model;

FIG. 5 is an enlarged view of the structure of area A of FIG. 4;

FIG. 6 is an exploded view of a second embodiment of the present utility model;

FIG. 7 is an enlarged view of the structure of region B of FIG. 6;

fig. 8 is a cross-sectional view of a heat conductive member of the present utility model;

fig. 9 is an enlarged view of the structure of the region C in fig. 6.

Description of the specification reference numerals:

10. a battery module; 11. a frame; 111. a bottom plate; 112. an insulating film; 113. a water cooling plate; 114. a heat-conducting adhesive; 115. a first insulating plate; 116. a protrusion; 12. a cell stack; 121. a battery cell; 122. a monomer; 123. a partition plate; 13. a tab; 14. copper bar; 15. a heat conducting member 16, and an end plate.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

The battery is high in charging and discharging efficiency when working in the normal use temperature range, when the temperature of the battery exceeds the normal use temperature range, heat accumulated in the high-capacity charging and discharging process cannot be transferred, the charging and discharging efficiency of the battery is greatly reduced, and the service life of the battery can be seriously influenced. For the battery in the working state, the heating temperature at the tab of the battery is the highest, namely the temperature of the tab of the battery is the highest, and the heat emitted is the greatest. In the prior art, a conductive agent is generally added in an electrode active material to reduce contact resistance between the active materials and the tabs, so as to improve conductivity, or the multiplying power performance of the lithium ion battery is improved by changing the material, the size, the extraction mode and the connection process of the electrode. Because the battery tab belongs to a high-voltage high-current component, multiple difficulties of process, insulation and heat dissipation performance are faced when a heat dissipation path is established for the battery tab, and no corresponding cooling scheme exists at present.

Referring to fig. 1 and 2, a schematic structure of a battery module according to an embodiment of the utility model is shown. The battery module 10 of the present utility model includes: the frame 11, be provided with the accommodation space in the frame 11.

The electric core stacking body 12, the electric core stacking body 12 includes a plurality of electric cores 121, the both ends of electric core 121 are equipped with utmost point ear 13, and a plurality of electric cores 121 are along its thickness direction stack setting in the accommodation space of frame 11, and frame 11 forms support and protection to electric core 121, and adjacent electric core 121 passes through utmost point ear 13 electricity is connected. The connection mode between the tabs 13 is designed according to actual needs, for example, the tabs 13 are folded and then bent to the same side, or the tabs 13 are folded and then butted in opposite directions, wherein the positive tabs and the negative tabs between the battery cells 121 are sequentially connected to form a series connection, and the positive tabs, and the negative tabs are connected to form a parallel connection.

In the conventional battery module 10, in order to support the tab 13, a bus bar assembly is generally provided, and the tab 13 is fixedly connected with the bus bar assembly. On one hand, the tab 13 needs to pass through a plurality of through holes on the busbar assembly for installation, so that the connection is inconvenient; on the other hand, the bus bars occupy a certain space, increasing the size of the battery module 10. To overcome the above-described drawbacks, in the present embodiment, the heat conductive member 15 is provided. Specifically, referring to fig. 2, 4 and 5, since the thickness of the tab 13 is the thinnest among the cells 121, a gap exists between the tabs 13 of two adjacent cells 121, so that the heat conductive member 15 can be disposed between the tabs 13 without significantly increasing the size of the battery module 10. Meanwhile, the tab 13 is at least partially attached to the heat conducting member 15, and the heat conducting member 15 is at least partially connected to the frame 11, so that heat generated by the tab 13 can be directly conducted to the heat conducting member 15, and the heat conducting member 15 conducts heat of the tab 13 to the frame 11. Because the frame 11 has a large area, the heat dissipation efficiency of the frame 11 is far greater than that of the tab 13 itself, and the frame 11 is directly in contact with the external environment, and after the heat is transferred to the frame 11 by the heat conductive member 15, the frame 11 dissipates the heat to the external environment without being accumulated on the battery module 10. On the one hand, the heat conducting piece 15 is directly arranged between the lugs 13, and the lugs do not need to pass through small holes and the like of the busbar assembly, so that the assembly is convenient; on the other hand, the heat conduction piece 15 is attached to the tab 13, the tab 13 limits the position of the heat conduction piece 15, the stability of the position of the heat conduction piece 15 in the battery module 10 is guaranteed, the heat conduction piece 15 has certain strength, and the tab 13 can be supported, so that a busbar assembly is not required to be additionally arranged, and the increase of the busbar assembly to the size of the battery module 10 is avoided. According to the utility model, the busbar assembly is replaced by the heat conduction piece 15 capable of conducting heat, the direct cooling of the tab 13 can be realized without additionally arranging a heat dissipation module, and the busbar assembly has a simple structure and a good heat dissipation effect.

Further, on the basis of the first embodiment, in order to achieve the bonding between the tab 13 and the heat conducting member 15, the tab 13 at two sides of the heat conducting member 15 is bent in the direction of the heat conducting member 15, on the one hand, after the tab 13 is bent in the direction of the heat conducting member 15, the tab 13 at two sides of the heat conducting member 15 are bonded to each other, so as to achieve serial-parallel connection; on the other hand, the connection mode enables the lug 13 to wrap the heat conducting piece 15, the lamination area of the lug 13 and the heat conducting piece 15 is large, heat of the lug 13 is rapidly transferred to the heat conducting piece 15, and after the heat conducting piece 15 is wrapped, the position of the heat conducting piece is stable, and the supporting effect on the lug 13 is good.

Furthermore, on the basis of the first embodiment, the heat dissipation efficiency of the heat conducting member 15 to dissipate heat to air is low, so the heat conducting member 15 is of a hollow structure, the contact area between the heat conducting member 15 and the surrounding air is increased, the heat on the tab 13 can be directly dissipated to the surrounding space, and the heat on the tab 13 can be directly dissipated through the assembly gap of the battery module 10 after being diffused to the surrounding space, so that the heat is prevented from being gathered only on the tab 13. Further, since the heat conductive member 15 is at least partially connected to the frame 11, and in the actual connection structure, the heat conductive member 15 is surrounded by the tab 13 around, the end of the heat conductive member 15 abuts against the frame 11. And the hollow hole of cavity heat conduction spare 15 link up heat conduction spare 15, if the both ends of heat conduction spare 15 all butt frame, and the cavity both ends are all by the shutoff, and the cavity hole has lost the radiating function, in order to avoid this kind of circumstances, the one end of heat conduction spare 15 is connected to frame 11, the other end of heat conduction spare 15 with frame 11 interval sets up to the inside heat of hollow structure can flow out.

Further, in order to connect external electronic components of the cell stack 12 for charging or power transmission, the battery module 10 is further provided with a copper bar 14. The copper bar 14 is connected with the lead-out end of the tab 13 to be connected to an external circuit. Specifically, referring to fig. 3, in the present embodiment, the copper bar 14 is L-shaped, the lead-out end of the tab 13 is bent to one side, the heat conducting member 15 is pressed while wrapping the connection end of the L-shaped copper bar 14, that is, the tab 13 is bent to clamp the copper bar 14 between the tab and the heat conducting member 15, and the position of the copper bar 14 is fixed while the tab 13 and the copper bar 14 are connected in series. The lead-out terminal of the L-shaped copper bar 14 extends in a direction away from the battery cell 121, thereby being electrically connected with other electronic components. In this connection, the heat generated by the tab 13 is transferred to the copper bar 14, the copper bar 14 transfers the heat generated by the tab 13 and the copper bar to the heat conducting member 15, at least part of the heat conducting member 15 is connected to the frame 11, the heat conducting member 15 transfers the heat generated by the tab 13 and the copper bar 14 to the frame 11, and the frame 11 is used to radiate the heat to the external environment.

As shown in fig. 2, 6 and 7, further, as a second embodiment of the present utility model, the first embodiment is characterized in that the cells 121 are formed by at least two monomers 122 connected in parallel, the cells 121 are separated by a separator 123, and adjacent cells are connected in series. Because the length of the tab 13 will be shortened after the tab 13 is butted, in this embodiment, in order to ensure that the plurality of monomers 122 can be conveniently connected in series after being connected in parallel, the tabs 13 of the monomers 122 are welded in a superposition manner during the parallel connection, and then the tabs 13 of the first group are folded in a reverse direction with the tabs 13 of the second group to realize the series connection. After the cells 122 are welded together to form the battery cells 121, the space between the tabs 13 of the parallel cells 122 is small, so that the heat conducting member 15 is inconvenient to set, and therefore, the heat conducting member 15 is set between the tabs 13 of the two series-connected battery cells 121. Further, because the multi-layer tab 13 is easy to cause a cold joint problem during the overlapping welding, two single bodies 122 are selected to be connected in parallel to form the battery cells 121, and the adjacent battery cells 121 are connected in series, so that the connection between the single bodies 122 is that after the two layers of tab 13 are overlapped and welded to form the battery cells 121 in parallel, the tab 13 of the adjacent battery cells 121 is bent in opposite directions to realize the butt joint and series connection.

Further, on the basis of the second embodiment, referring to fig. 7, since the cells 121 are formed by two groups of the single bodies 122 in this embodiment, after two tabs 13 in a group are overlapped and connected, the distance between the ends of the tabs 13 facing the inside of the cells 121 in two adjacent groups is smaller, and the distance between the ends of the tabs 13 facing the outside of the cells 121 is larger, and in order to match the connection structure of the tabs 13, referring to fig. 8, the cross section of the heat conducting member 15 is trapezoidal. The shorter sides of the trapezium face the inside of the battery cell 121, and the longer sides of the trapezium face the outside of the battery cell 121. At this time, the electrode lugs 13 cover the long sides of the trapezoid, the structure of the heat conducting piece 15 is matched with the space shape between the two groups of electrode lugs 13, and the electrode lugs 13 are contacted with the two side surfaces and the bottom surface of the trapezoid, namely, the contact area between the electrode lugs 13 and the heat conducting piece 15 is large, so that the heat transfer speed is high, and the heat dissipation efficiency is improved.

As a preferred embodiment of the present utility model, based on the first embodiment, the heat conducting member 15 is a heat pipe, a heat conducting glue 114, a heat conducting structural glue, a heat conducting pad, a VC pipe, a graphene sheet, or a composite phase change material, and the above materials are insulating materials, or can be insulated by insulating treatment, so that the heat conducting member 15 does not conduct electricity while conducting heat, and does not cause a short circuit of the battery module 10, and becomes a heat conducting bridge between the tab 13 and the copper bar 14. And is itself also capable of absorbing heat and storing it. At this time, when the tab 13 and the copper bar 14 are in operation, the heat generated by the tab is firstly absorbed by the heat conducting member 15, and the heat conducting member 15 becomes a heat storage tank. A first path for heat dissipation of the tab 13, the tab 13 and the copper bar 14 is formed. The heat conducting member 15 then conducts the heat to the frame 11, and the frame 11 dissipates the heat to the outside environment. This is the second path for heat dissipation from tab 13, tab 13 and copper bar 14.

Referring to fig. 6, in order to simplify the connection structure while securing the support of the heat conducting member 15, since the heat conducting member 15 has a certain weight and at least one end of the heat conducting member 15 is in contact with the frame 11, the frame 11 includes a bottom plate 111, and at this time, the heat conducting member 15 is in contact with at least the bottom plate 111 under the action of gravity. To ensure insulation between the battery cells 121 and the bottom plate 111, an insulating film 112 is disposed on the bottom plate 111, and the end of the heat conducting member 15 directly contacts the insulating film 112. At this time, the heat dissipation paths of the tab 13 and the copper bar 14 are: tab 13/copper bar 14- & gtheat conducting member 15- & gtinsulating film 112- & gtbottom plate 111- & gtexternal environment. Since the battery cells 121 also generate heat during operation, in order to dissipate heat of the whole module, a water cooling plate 113 is further disposed on the outer side of the bottom plate 111. Since the end of the battery cell 121 has the tab 13 and the heat conducting member 15, for convenience, the water inlet of the water cooling plate 113 is disposed at the side of the battery cell stack 12, that is, at the end plate 16 of the frame 11. The bottom plate 111 and the water-cooling plate 113 are bonded and connected by the heat-conducting glue 114, that is, heat exchange can be performed between the bottom plate 111 and the water-cooling plate 113 by the heat-conducting glue 114, so that the heat dissipation efficiency of the bottom plate 111 is further improved. At this time, the heat dissipation paths of the tab 13 and the copper bar 14 are: tab 13/copper bar 14- & gtheat conducting piece 15- & gtinsulating film 112- & gtbottom plate 111- & gtheat conducting glue 114- & gtwater cooling plate 113- & gtcooling liquid. And the water cooling plate 113 has high heat dissipation efficiency, and the heat dissipation path is the main heat dissipation path of the tab 13 and the copper bar 14. Further, the soft pack battery module 10 has poor insulation performance and weak structural strength, and is easily deformed after being extruded by external force, thereby damaging the internal battery cells 121. Therefore, a first insulating plate 115 is disposed between the bottom plate 111 and the battery cell 121, and a plurality of protrusions 116 are disposed on a side surface of the first insulating plate 115 attached to the battery cell 121 so as to correspond to the position of the battery cell 121. The arrangement of the first insulating plate 115 improves the structural strength of the battery module 10, and the arrangement of the protrusions 116 makes the position of the battery cell 121 more stable, and also improves the insulating performance and the compression resistance of the first insulating plate 115, so that the battery cell 121 inside is prevented from being damaged when being extruded by external force.

Referring to fig. 9, in a fifth embodiment of the present utility model, compared with the first embodiment, the frame 11 further includes an end plate 16, and the heat conducting member 15 is at least partially connected to the end plate 16. The heat conducting member 15 not only conducts heat to the bottom plate 111, but also to the end plate 16, the end plate 16 radiates heat to the external environment, and the end plate 16 further increases the radiating area of the heat radiated to the external environment, thereby improving the radiating efficiency.

The utility model also provides a battery pack, which comprises a shell, a thermal management assembly and a plurality of battery modules 10. The heat dissipation of the battery cell 121, the electrode lugs 13 and the copper bars 14 is regulated and controlled by utilizing the thermal management component, so that the requirement of super fast charging on battery heat dissipation is met, and the probability of out-of-control of the battery Bao Re is reduced.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. A battery module, comprising: the frame is internally provided with an accommodating space;

2. The battery module according to claim 1, wherein the cells are formed by connecting at least two single bodies in parallel, the cells are separated by a separator, adjacent cells are connected in series, and the heat conducting member is disposed between two groups of the tabs connected in series.

3. The battery module according to claim 2, wherein the cross section of the heat conducting member is trapezoidal, the shorter side of the trapezoid faces the inside of the battery cell, and the longer side of the trapezoid faces the outside of the battery cell.

4. The battery module according to claim 1, wherein the heat conductive member has a hollow structure, and one end of the heat conductive member is connected to the frame.

5. The battery module of claim 1, wherein the thermally conductive member is a heat pipe, a thermally conductive adhesive, a thermally conductive structural adhesive, a thermally conductive pad, a VC pipe, a graphene sheet, or a composite phase change material.

6. The battery module according to claim 1, wherein the frame includes a bottom plate on which an insulating film is provided, and the heat conductive member is connected to the insulating film.

7. The battery module of claim 6, wherein the frame further comprises a water cooling plate, a water inlet of the water cooling plate is arranged at the side edge of the cell stack body, and the bottom plate is bonded with the water cooling plate through a heat conducting adhesive.

8. The battery module according to claim 7, wherein a first insulating plate is provided between the bottom plate and the cell stack, and a plurality of protrusions are provided on a side surface of the first insulating plate, which is attached to the cell stack, so as to correspond to the positions of the cells.

9. The battery module of claim 7, wherein the frame further comprises an end plate, and the thermally conductive member is at least partially connected to the end plate.

10. A battery pack comprising a housing, a thermal management assembly, and a plurality of battery modules according to any one of claims 1-9.