CN112768843A

CN112768843A - Collector plate and battery module

Info

Publication number: CN112768843A
Application number: CN202110108021.5A
Authority: CN
Inventors: 孙嘉; 李德连; 周鹏
Original assignee: Sinoev Hefei Technologies Co Ltd
Current assignee: Sinoev Hefei Technologies Co Ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-05-07

Abstract

The embodiment of the application provides a current collector and a battery module, and relates to the technical field of batteries. The current collector that this application embodiment provided is provided with the mounting groove that is used for laying the heater strip, therefore it can provide electrically conductive effect in, give electric core through utmost point ear transmission with the heat of heater strip, plays the effect of heating electric core. The heating wire is installed and fixed through the collector plate, so that the number of complex accessories of the traditional heating assembly is reduced, the structure is stable, and the cost is lower. And the battery core is directly heated through the collector plate, so that the heating efficiency is high. The battery module that this application embodiment provided, including heater strip, a plurality of electric cores and two at least foretell current collectors, the current collector passes through the pole piece of utmost point ear butt electric core, and the heater strip is buried underground in the mounting groove. The battery module has the advantages of simple and stable structure, lower cost, easy assembly and good heating effect.

Description

Collector plate and battery module

Technical Field

The application relates to the technical field of batteries, in particular to a current collecting plate and a battery module.

Background

In a new energy electric vehicle in a cold region, the temperature of a lithium ion battery in a battery pack is probably lower than 0 ℃, and the ideal working temperature range of the lithium ion battery is 15-40 ℃. Under the condition of low temperature, the battery pack has the phenomena of capacity reduction, internal resistance increase, internal side reaction increase and the like, particularly, the phenomenon of lithium precipitation is easy to occur during charging, the service life of the battery is greatly reduced, and the safety risk is increased. In order to solve the problem, at present, a heating film/wire and a heating liquid snake-shaped flat tube are mostly arranged for a battery module in a battery pack so as to heat the battery module. However, the existing heating assembly is complex in overall structure and low in assembly efficiency.

Disclosure of Invention

An object of this application is to provide a current collector and battery module, and it has simple stability, characteristics that assembly efficiency is high.

The embodiment of the application is realized as follows:

in a first aspect, the present application provides a current collecting plate, which is applied to a battery module, and includes a first surface and a second surface opposite to each other in a thickness direction, wherein a tab is convexly disposed on the first surface, and the tab is used for abutting against a pole piece of an electric core in the battery module; the second surface is provided with an installation groove, and the installation groove is used for embedding the heating wire.

In an alternative embodiment, the mounting slots are routed on the collector plate.

In an alternative embodiment, the mounting slot is a wave-shaped slot.

In an alternative embodiment, the current collecting plate is provided with a notch and/or a through hole, and the tab is connected to the through hole or the edge of the notch and protrudes out of the first surface of the current collecting plate.

In an alternative embodiment, the current collecting plate is provided with a connection hole.

In a second aspect, the application provides a battery module, including heater strip, a plurality of electric cores and at least two current collector plates of any one of the aforementioned embodiments, the both ends of electric core are provided with the pole piece, and the tip of a plurality of electric cores flushes, and at least two current collector plates are located the both ends of electric core respectively, and the first face of current collector plate is towards electric core to through the pole piece of utmost point ear butt electric core, the heater strip is buried underground in the mounting groove.

In an optional implementation mode, the battery module further comprises two clamping plates, the two clamping plates are arranged at intervals and arranged on the battery core from two ends of the battery core in a clamping mode, the two clamping plates are respectively provided with a pole piece avoiding hole for exposing the battery core, the at least two current collecting plates are respectively connected to one side of the two clamping plates, which deviates from the battery core, and the pole piece exposed in the hole is abutted through the pole lugs.

In an optional embodiment, a connecting column is arranged on the clamping plate, the connecting column is arranged on the edge of one surface, facing the battery core, of the clamping plate, and the connecting columns of the two clamping plates are mutually abutted and connected through screws.

In an alternative embodiment, a screw hole for fixing the current collecting plate is provided on a side of the clamping plate facing away from the battery cell.

In an optional embodiment, the battery module comprises a plurality of heating wires, and the heating power of the heating wires is positively correlated with the heat dissipation capacity of the battery module at the position of the heating wires.

The beneficial effects of the embodiment of the application are that:

the current collector that this application embodiment provided is provided with the mounting groove that is used for laying the heater strip, therefore it can provide electrically conductive effect in, gives electric core through utmost point ear transmission with the heat of heater strip, plays the effect of heating electric core. The embodiment of the application provides the assembly that the current collector can be convenient for heating element (heater strip), and the battery module stable in structure after the equipment. The heating wires are installed and fixed through the collector plate, so that the number of complex accessories of the traditional heating assembly is reduced, and the cost is lower. And the battery core is directly heated through the collector plate, so that the heating efficiency is high.

The embodiment of the application provides a battery module, including heater strip, a plurality of electric cores and two at least foretell current collector plates, the both ends of electric core are provided with the pole piece, and the tip of a plurality of electric cores flushes, and two at least current collector plates are located the both ends of electric core respectively, and the first face of current collector plate is towards electric core to through the pole piece of utmost point ear butt electric core, the heater strip is buried underground in the mounting groove. The battery module has the advantages of simple and stable structure, lower cost, easy assembly and good heating effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is an assembly view of a battery module according to an embodiment of the present application;

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

FIG. 3 is a schematic view of a splint according to an embodiment of the present application;

fig. 4 is a schematic view of a current collector plate according to an embodiment of the present application.

100-battery module; 200-electric core; 300-clamping plate; 310-a connecting column; 320-avoiding holes; 330-screw hole; 340-sheet metal parts; 400-a collector plate; 410-mounting grooves; 420-pole ear; 430-through holes; 440-a notch; 450-connecting hole; 500-heating wire; 600-protection plate.

Detailed Description

At present, new energy electric vehicles become the development trend of automobiles and are gradually popularized. Most of the batteries used as power sources of electric vehicles are lithium ion batteries. Under the condition of low temperature, the battery pack has the phenomena of capacity reduction, internal resistance increase, internal side reaction increase and the like, particularly, the phenomenon of lithium precipitation is easy to occur during charging, the service life of the battery is greatly reduced, and the safety risk is increased. In order to solve the problem, at present mostly set up heating element to heat electric core for in the battery package usually, for example add mode such as heating film, heating liquid snakelike flat pipe, adopt the mode of contact, winding electric core to electric core heating. However, the existing heating assembly is complex in overall structure and low in assembly efficiency.

In order to improve the problem among the above-mentioned prior art, this application embodiment provides a collector plate and battery module, through set up the mounting groove on the collector plate, can arrange the heater strip in the mounting groove, through the heat conduction to the collector plate, passes to electric core with the heat. The heating assembly which is directly wound and covered on the battery core is reduced, so that the whole battery module is simple and stable in structure and has a better heating effect.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "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 meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Fig. 1 is an assembly view of a battery module 100 according to an embodiment of the present disclosure; fig. 2 is an exploded view of the battery module 100 according to an embodiment of the present application. As shown in fig. 1 and fig. 2, a battery module 100 provided by an embodiment of the present application includes two clamping plates 300, a heating wire 500, a plurality of battery cells 200, and two current collecting plates 400. The both ends of electric core 200 are provided with the pole piece, and the tip of a plurality of electric cores 200 flushes, and two at least current collector 400 are located the both ends of electric core 200 respectively, and the first face of current collector 400 is towards electric core 200 to through utmost point ear 420 butt electric core 200's pole piece, heater strip 500 buries underground in mounting groove 410.

In this embodiment, the plurality of battery cells 200 are all cylindrical with equal size. The battery cells 200 are divided into a plurality of groups, and both ends of each group of battery cells 200 collect current through the current collecting plate 400, that is, the battery cells 200 of each group are connected in parallel through the current collecting plate 400. A temperature sensor (not shown in the figure) may be further disposed around the battery cell 200 to collect the temperature of the battery cell 200. In this embodiment, the battery cells 200 are stacked in an L-shape, and of course, the stacked shape of the battery cells 200 should meet the structural design requirement of the battery pack, and in other embodiments, the battery cells 200 may also be stacked in other postures.

In this embodiment, the two clamping plates 300 are disposed at intervals, and respectively clamp the battery cell 200 from two ends of the battery cell 200, and the two clamping plates 300 fix the battery cell 200. The clamping plate 300 also has an L-shaped plate shape in order to match the stacked form of the battery cells 200. Fig. 3 is a schematic view of a splint 300 according to an embodiment of the present application. As shown in fig. 3, the clamping plate 300 is provided with an avoiding hole 320 to expose a pole piece (positive electrode or negative electrode) of the battery cell 200, so that the current collecting plate 400 can be connected to the pole piece of the battery cell 200 through the avoiding hole 320 even when the current collecting plate is assembled outside the clamping plate 300. In addition, the end of the battery cell 200 can be clamped at the avoidance hole 320, so that the stability of the battery cell 200 can be ensured.

As shown in fig. 3, the clamping plate 300 is provided with connecting posts 310, the connecting posts 310 are arranged on the edge of one surface of the clamping plate 300 facing the battery cell 200, and the connecting posts 310 of the two clamping plates 300 are abutted against each other and connected by screws. Specifically, be provided with a plurality of spliced poles 310 on the splint 300, a plurality of spliced poles 310 set up along the edge of splint 300 to, be provided with the cell body that extends along the length direction of spliced pole 310 on the spliced pole 310, the one end that splint 300 was kept away from to this cell body is punched and is convenient for mounting screw. It should be understood that the present application uses screws to connect the connecting posts 310 of the two clamping plates 300, and in alternative embodiments, the two clamping plates 300 can be connected by a snap-fit structure.

In the present embodiment, a screw hole 330 for fixing the current collecting plate 400 is provided on a side of the clamping plate 300 facing away from the battery cell 200. Of course, in alternative embodiments, the collecting plate 400 may be fixed to the clamping plate 300 by other means, such as by snapping or gluing, welding, etc. In this embodiment, the battery module 100 is further provided with a sheet metal part 340 to limit the battery core 200, and the sheet metal part 340 is connected between the two clamping plates 300.

Fig. 4 is a schematic view of a current collecting plate 400 according to an embodiment of the present application. As shown in fig. 4, the current collecting plate 400 includes a first surface and a second surface opposite to each other in the thickness direction, the first surface is convexly provided with a tab 420, and the tab 420 is used for abutting against a pole piece of the battery cell 200 in the battery module 100; the second surface is provided with mounting grooves 410, and the mounting grooves 410 are used for embedding the heater strip 500.

One side (the second side) far away from the battery cell 200 at the current collecting plate 400 is provided with the mounting groove 410, so that the heater wire 500 can be conveniently arranged on the outer side surface of the current collecting plate 400, and compared with the method of laying and winding the heating assembly on the battery cell 200, the arrangement mode of the heater wire 500 in the embodiment of the application is simpler and more convenient, the current collecting plate 400 which originally has to be in contact with the battery cell 200 is utilized to heat the battery cell 200, and the stability is high.

In the present embodiment, the mounting grooves 410 are arranged on the current collecting plate 400 in a winding manner, that is, are folded back on the current collecting plate 400, so that the arrangement length of the heating wire 500 can be increased, and the heating efficiency can be improved.

Further, as shown, the mounting groove 410 is a wave-shaped groove. By setting the installation groove 410 in a wave shape, the arrangement length of the heating wire 500 can be further increased, further improving the heating efficiency.

In an alternative embodiment, the current collecting plate 400 is provided with a notch 440 and/or a through-hole 430, and the tab 420 is attached to the through-hole 430 or an edge of the notch 440 and protrudes from the first surface of the current collecting plate 400. As shown in fig. 4, in the present embodiment, the current collecting plate 400 is provided with both the through hole 430 and the notch 440 at the edge, the tab 420 is in a sheet shape, one end of the tab is connected to the through hole 430 or the edge of the notch 440, and then the entire tab 420 is bent toward the surface of the current collecting plate 400 facing the battery cell 200, so that the other end of the tab 420 can protrude from the first surface of the current collecting plate 400 and abut against the pole piece of the battery cell 200.

In this embodiment, the tab 420 has a certain elasticity, and thus when it is abutted against the tab, a certain pressing force can be applied, thereby maintaining good contact. In this embodiment, the through hole 430 is identical to the avoiding hole 320 in shape.

In this embodiment, a plurality of current collecting plates 400 are respectively disposed at both ends of the battery cell 200, and each current collecting plate 400 corresponds to one group of battery cells 200. Each of the current collecting plates 400 is insulated from each other by a space or connected using an insulating member.

In this embodiment, the collecting plate 400 is provided with a coupling hole 450, and a screw may be inserted through the coupling hole 450 to be engaged with the screw hole 330 of the chucking plate 300. Of course, in order to accurately mount the collecting plate 400 in place, positioning holes may be provided in the collecting plate 400, and positioning posts may be provided outside the clamping plate 300 to perform positioning.

Further, the heater wire 500 is embedded in the mounting groove 410 and extends along the direction of the mounting groove 410. In order to ensure that short circuit between the heater wire 500 and the current collecting plate 400 due to current conduction does not occur, in the present embodiment, the heater wire 500 and the current collecting plate 400 are insulated by an insulating layer. An insulating layer may be applied to the mounting grooves 410 of the current collecting plate 400, and the insulating layer may also be applied to the surface of the heating wire 500.

In this embodiment, the heater wire 500 may be fixed in the mounting groove 410 by means of a snap, an adhesive, or the like, so as to increase the stability of the heater wire 500. The heating wire 500 in the embodiment of the present application may be an iron-chromium-aluminum heating wire, a nickel-chromium heating wire, or the like.

In order to further improve the safety of the heating wire 500 in the process of heating the battery module 100, in this embodiment, a protection device (not shown in the figure) may be further provided to limit the power of the heating wire 500 by limiting the maximum current, the maximum voltage, or the maximum temperature (for example, using the fuse blowing principle), so as to avoid the potential safety hazard caused by the excessive current, voltage or temperature.

Different battery packs have different complex structures, so that the heat dissipation capacities of different parts of the battery module are different. Different heat dissipation capabilities may cause temperature differences at different positions in the battery module, and the temperature differences cause differences in battery state of charge (state of charge) of the battery cells at different positions, thereby affecting working performance and causing differences in service lives of different battery cells. Therefore, in the embodiment of the present application, the battery module 100 may include a plurality of heating wires 500, and the heating power of the heating wires 500 is positively correlated with the heat dissipation capacity of the battery module 100 at the position of the heating wires 500. For example, one heater wire 500 is corresponding to each current collecting plate 400, that is, one heater wire 500 is used for heating a group of battery cells 200. Many parallelly connected or series connection with heater strip 500, distribute different heater strips 500 according to the heat-sinking capability of battery module 100 different positions, can make the place that the heat-sinking capability is strong supply more heat through heater strip 500 like this, make whole battery module 100's temperature more even, be favorable to the promotion of battery module 100's performance and life-span.

Optionally, a protective plate 600 may be further installed on the outer side of the current collecting plate 400 to protect the heater wire 500 and the current collecting plate 400, and also may have a certain heat preservation effect. The protection plate 600 may be an epoxy plate.

To sum up, the current collecting plate 400 provided in the embodiment of the present application is provided with the mounting groove 410 for laying the heating wire 500, so that it can provide the electric conduction function and transmit the heat of the heating wire 500 to the battery cell 200 through the tab 420, thereby heating the battery cell 200. The current collecting plate 400 provided in the embodiment of the present application can facilitate the assembly of the heating assembly (heater wire 500), and the assembled battery module 100 is structurally stable. The heating wire 500 is fixedly installed through the current collecting plate 400, so that the complicated fittings of the conventional heating assembly are reduced, and the cost is low. And the battery cell 200 is directly heated by the collector plate 400, so that the heating efficiency is high.

The embodiment of the application provides a battery module 100, including heater strip 500, a plurality of electric cores 200 and two at least foretell collector plates 400, the both ends of electric core 200 are provided with the pole piece, and the tip of a plurality of electric cores 200 flushes, and two at least collector plates 400 are located the both ends of electric core 200 respectively, and the first face of collector plate 400 is towards electric core 200 to through utmost point ear 420 butt electric core 200's pole piece, heater strip 500 buries underground in mounting groove 410. The battery module 100 has the advantages of simple and stable structure, low cost, easy assembly and good heating effect.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The collector plate is applied to a battery module and is characterized by comprising a first surface and a second surface which are opposite in the thickness direction, wherein a lug is convexly arranged on the first surface and is used for abutting against a pole piece of a battery cell in the battery module; and the second surface is provided with an installation groove, and the installation groove is used for embedding the heating wire.

2. The collecting plate according to claim 1, wherein the mounting groove is provided on the collecting plate in a winding manner.

3. The collecting plate according to claim 1, wherein the mounting groove is a wave-shaped groove.

4. The collector plate according to claim 1, wherein said collector plate is provided with a notch and/or a through hole, and said tab is attached to said through hole or an edge of said notch and protrudes from said first surface of said collector plate.

5. The collecting plate according to claim 1, wherein the collecting plate is provided with a connection hole.

6. A battery module is characterized by comprising a heating wire, a plurality of battery cells and at least two current collecting plates of any one of claims 1 to 5, wherein pole pieces are arranged at two ends of each battery cell, the ends of the battery cells are flushed, the current collecting plates are respectively positioned at two ends of each battery cell, the first surfaces of the current collecting plates face the battery cells and are abutted against the pole pieces of the battery cells through pole lugs, and the heating wire is embedded in the mounting groove.

7. The battery module according to claim 6, further comprising two clamping plates, wherein the two clamping plates are disposed at intervals and clamped on the battery core from two ends of the battery core, each of the two clamping plates is provided with an avoiding hole to expose the pole piece of the battery core, and at least two current collecting plates are respectively connected to one side of the two clamping plates away from the battery core and abut against the pole piece exposed in the avoiding hole through the tab.

8. The battery module according to claim 7, wherein the clamping plates are provided with connecting posts, the connecting posts are arranged on the edges of the surfaces, facing the battery cells, of the clamping plates, and the connecting posts of the two clamping plates are mutually abutted and connected through screws.

9. The battery module according to claim 8, wherein a side of the clamping plate facing away from the battery core is provided with a screw hole for fixing the current collecting plate.

10. The battery module according to claim 6, wherein the battery module comprises a plurality of the heating wires, and the heating power of the heating wires is positively correlated with the heat dissipation capacity of the battery module at the positions of the heating wires.