Expandable power battery heating film and battery cell module

Abstract

The utility model relates to an expandable power battery heating film and a battery cell module. The expandable power battery heating film comprises at least one first heating film and at least one second heating film, the first heating film comprises a first heating subarea and a second heating subarea which are arranged at an interval; the first heating subarea and the second heating subarea are connected through a conductive connecting piece; the first heating films and the second heating films are arranged at intervals from the head end to the tail end in the first direction and electrically connected in series. According to the utility model, after a heating film is pasted on a single cell module, the single cell module can be conveniently and independently turned over for testing, and then the two modules are locked and fastened, so that the process convenience is improved, and the production efficiency is improved; the connecting terminal adopted by the utility model is made of a standard general material, so that the material and die cost is reduced, and the manufacturability is improved. According to the utility model, more battery cell module assembly forms can be expanded and derived, and the diversity performance of the scheme is improved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to an expandable power battery heating film and a battery cell module. Background Art

[0002] With the rapid development of the new energy field, the compatibility of the operating temperature environment of battery products is also getting higher and higher. Most of the battery cells of battery products are arranged in a matrix or honeycomb and then formed into a battery cell module. Due to the characteristics of the battery cells, their performance will decrease at low temperatures. When charging and discharging are required at low temperatures, a heating film needs to be set in the module to ensure good charging and discharging performance in a low-temperature environment. However, when multiple battery cell modules are connected in series, for the traditional structure of the whole heating film, during assembly, it needs to be attached around the module, resulting in low production efficiency, and it is impossible to expand more modules. How to optimize and improve the bottleneck in the production and assembly process and increase the expansion form has always been a pain point for battery packaging factories.

[0003] An existing heating film structure, such as Figure 1-2 shown, when multiple battery cell modules are connected in series, the structure of the whole heating film 1 is as Figure 1 shown. Specifically, it is a schematic diagram of the assembled structure, which usually consists of three connected heating films. During assembly, it needs to be attached around the module 2. First, the middle heating film needs to be installed, then the two battery cell modules are locked, and then the front and rear heating films can be installed. Finally, a control board 3 is installed at one end. During this process, there are problems such as the front and rear heating film pieces fluttering and swinging, difficult positioning, and difficult fixing of the module, resulting in poor operation processability. Summary of the Utility Model

[0004] In order to solve the above problems of the prior art, the utility model provides an expandable power battery heating film.

[0005] In order to achieve the above object, the main technical solutions adopted by the utility model include:

[0006] An expandable power battery heating film includes at least one first heating film and at least one second heating film; the first heating film includes a first heating zone and a second heating zone arranged at intervals; the first heating zone and the second heating zone are connected by a conductive connection piece; a plurality of the first heating films and the second heating films are arranged at intervals from the head end to the tail end in a first direction and are electrically connected to achieve series connection.

[0007] Further, the conductive connection piece is a heating film.

[0008] Further, the conductive connection piece is provided with a first wire harness electrically connected to an adjacent first heating film or second heating film; the second heating film is provided with a second wire harness electrically connected to an adjacent first heating film or second heating film.

[0009] Further, an extension piece is formed on the same side of the second heating film as the conductive connection piece; a second wire harness is provided on the extension piece.

[0010] Further, a third wire harness connected to the power supply end is provided on the second heating film.

[0011] Further, a plurality of through holes are uniformly provided on the first heating film and the second heating film.

[0012] Further, a plurality of the first heating films and the second heating films are arranged at intervals from the head end to the tail end in the first direction and are electrically connected in series through conductive sheets; the conductive sheets and the conductive connection pieces are made of nickel or copper; the conductive sheets and the conductive connection pieces are connected by welding.

[0013] A battery cell module, characterized in that it includes the above-mentioned expandable power battery heating film and at least two battery cell modules; the battery cell modules are arranged at intervals in the first direction; at least one end face perpendicular to the first direction of each battery cell module is attached to one of the first heating film or the second heating film.

[0014] Further, the battery cell module includes a plurality of cylindrical battery cells arranged between battery cell brackets and a bus bar arranged on the battery cell brackets and attached to and electrically connected to the ends of the plurality of cylindrical battery cells; the first heating film or the second heating film is attached to the end face of the bus bar away from the cylindrical battery cells; a heat-conducting adhesive layer is provided on one side of the first heating film or the second heating film close to the bus bar.

[0015] Further, the battery cell module includes a plurality of cylindrical battery cells arranged between battery cell brackets and a bus bar arranged on the battery cell brackets and attached to and electrically connected to the ends of the plurality of cylindrical battery cells; a heat-conducting plate is connected to the bus bar; the first heating film or the second heating film is attached to the end face of the heat-conducting plate away from the cylindrical battery cells; a heat-conducting adhesive layer is provided on one side of the first heating film or the second heating film close to the heat-conducting plate.

[0016] (III) Beneficial effects

[0017] The beneficial effects of the present utility model are as follows: After the heating film can be respectively and conveniently assembled on a single battery cell module, it can be easily and separately transported and tested, and then the two modules are locked and fastened, which improves the convenience of the process and the production efficiency; the connection terminals adopted are standard general materials, which reduces the material and mold costs and improves the manufacturability; when the conductive sheets are used for electrical connection, the cost can be saved and the occupation of the internal space can be reduced; when the wire harnesses are used for connection, flexible series expansion can be realized, the process difficulty can be reduced, and the operation is convenient; by setting the heat-conducting plate, the installation difficulty of the heating film can be reduced; the battery heating film structure of the present utility model can be extended and derived to more assembly forms of battery cell modules, which improves the diversity of the solution. Description of the drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related accompanying drawings can also be obtained based on these drawings.

[0019] Figure 1 is a schematic diagram of the heating film structure of the prior art;

[0020] Figure 2 is an exploded view of the series connection structure of the multi-cell module of the prior art;

[0021] Figure 3 is a schematic diagram of the heating film structure of the present utility model;

[0022] Figure 4 is a schematic diagram of another embodiment structure of the heating film of the present utility model;

[0023] Figure 5 is a schematic diagram of the assembly of the cell module of the present utility model;

[0024] Figure 6 is a three-dimensional view of the cell module of the present utility model;

[0025] Explanation of reference numerals:

[0026] 110, the first heating film; 111, the first heating zone; 112, the second heating zone; 113, the conductive connection piece; 114, the first wire harness; 120, the second heating film; 121, the extension piece; 122, the second wire harness; 123, the third wire harness; 124, the lead-out end; 130, the through hole; 140, the conductive sheet; 200, the cell module; 201, the head end; 202, the tail end; 210, the cell bracket; 220, the cylindrical cell; 230, the bus bar; 240, the heat conduction plate; 250, the control board module. Detailed embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, terms such as "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0030] An expandable power battery heating film includes at least one first heating film 110 and at least one second heating film 120; the first heating film 110 includes first heating zones 111 and second heating zones 112 arranged at intervals; the first heating zones 111 and the second heating zones 112 are connected by a conductive connection piece 113; a plurality of the first heating films 110 and the second heating films 120 are arranged at intervals from the head end 201 to the tail end 202 in a first direction and are electrically connected to achieve series connection; the first direction is as Figure 3-4 the D direction in

[0031] such as Figure 3As shown, a structure of a first heating film 110 and a second heating film 120 is used as an example for explanation, and this structure corresponds to the installation of two battery modules 200; the first heating film 110 is composed of a first heating partition 111 and a second heating partition 112 which are arranged opposite to each other; the first heating partition 111 and the second heating partition 112 are respectively arranged at two ends of the battery module 200 for heating the battery module 200; the first heating partition 111 and the second heating partition 112 are electrically connected through a conductive connecting sheet 113;

[0032] This design adopts a split form, with a two-in-one first heating film 110 mounted on the front and back of the first battery module, and a single-piece second heating film 120 mounted in front of the second battery module, and the first heating film 110 is electrically connected to the second heating film 120. Compared with several single-piece heating films, this design adopts a first heating film 110 with a connected structure, which can effectively reduce the connection structure / connection harness between adjacent heating films, save costs and achieve rapid installation; compared with the continuous whole heating film mentioned in the background technology, it adopts a split form, which is less difficult to install and has higher production efficiency; the first heating film 110 can be set on the end face of the battery module 200 more quickly. Since the first heating film 110 is composed of two heating films and only needs to be attached to the two end faces of the battery module 200, it only operates on one battery module 200, so it can be attached to the end faces of the battery module 200 in turn, and a single battery module 200 can be operated separately to reduce the difficulty.

[0033] In one embodiment, in order to realize the series connection between the first heating film 110 and the second heating film 120; the conductive connecting sheet 113 is provided with a first wiring harness 114 electrically connected to the adjacent first heating film 110 or the second heating film 120; the second heating film 120 is provided with a second wiring harness 122 electrically connected to the adjacent first heating film 110 or the second heating film 120; the second heating film 120 is provided with an extension sheet 121 extending on the same side as the conductive connecting sheet 113; the extension sheet 121 is provided with a second wiring harness 122; in one embodiment, as Figure 3As shown, it includes a first heating film 110 and a second heating film 120. The electrical connection between the two is achieved by docking the first wire harness 114 and the second wire harness 122. In another embodiment, when there are two first heating films 110 and one second heating film 120, in order to ensure the series connection among the three, multiple wire harnesses need to be provided on one of the heating films. When one of the first heating films 110 is in the middle, two first wire harnesses 114 are provided on the first heating film 110, which are electrically connected to the first wire harnesses 114 on the other first heating films 110 located on both sides and the second wire harness 122 on the second heating film 120 respectively. In this embodiment, when the number of battery cell modules 200 increases, in order to ensure the electrical connection between the heating films, the number of connecting wire harnesses increases significantly, which is not conducive to the utilization of the internal space of the battery module and will also increase the cost.

[0034] In one embodiment, the conductive connection piece 113 is a heating film. Therefore, the first heating film 110 is actually an integral heating film structure, so that the electrical connection structure between its two heating parts can be omitted, simplifying the structure and reducing the installation difficulty.

[0035] In one embodiment, in order to reduce costs, reduce the use of wire harness connectors, and make reasonable use of space; several of the first heating films 110 and second heating films 120 are arranged at intervals from the head end 201 to the tail end 202 in the first direction and are connected in series through the conductive sheet 140; the materials of the conductive sheet 140 and the conductive connection piece 113 are nickel or copper; the conductive sheet 140 is welded to the conductive connection piece 113; as Figure 4 As shown, it includes a first heating film 110 and a second heating film 120; the first heating film 110 and the second heating film 120 are electrically connected through the conductive sheet 140; one end of the conductive sheet 140 is welded to the lead-out end 124 of the second heating film 120, and the other end is welded to the conductive connection piece 113 to realize their series connection; compared with the connection of material wire harnesses, welding with the conductive sheet 140 can effectively save the internal space, reduce the use of wire harnesses, save the number of connectors, and reduce the production cost; the lead-out end 124 is an electrical connection end extending from the narrow end face in the thickness direction of the second heating film 120, which can facilitate welding with the conductive sheet 140.

[0036] In one embodiment, a third wire harness 123 connected to the power supply end is provided on the second heating film 120; by electrically connecting through the third wire harness 123 and the power supply end, the connection of the heating film can be quickly disconnected during maintenance; the power supply end is usually the battery cell module 200 to which the heating film is connected.

[0037] In one embodiment, a plurality of through holes 130 are evenly provided on the first heating film 110 and the second heating film 120. On the one hand, the through holes 130 can be used for the penetration of long screws during the assembly of a plurality of battery cell modules 200, providing a space for the long screws to pass through. On the other hand, the through holes 130 can provide positioning during the assembly of the heating film and the battery cell modules 200, facilitating installation. On the other hand, the use of materials is also reduced, which can save costs.

[0038] A battery cell module includes the expandable power battery heating film and at least two battery cell modules 200. The battery cell modules 200 are arranged at intervals in a first direction. For the first direction, refer to Figure 5 the D direction in []. Each end face of the battery cell module 200 perpendicular to the first direction is attached to at least one of the first heating film 110 or the second heating film 120. The battery cell module 200 includes a plurality of cylindrical battery cells 220 arranged between battery cell brackets 210 and a bus bar 230 arranged on the battery cell brackets 210 and attached to and electrically connected to the ends of the plurality of cylindrical battery cells 220. The first heating film 110 or the second heating film 120 is attached to the end face of the bus bar 230 away from the cylindrical battery cells 220. A heat-conducting adhesive layer is provided on the side of the first heating film 110 or the second heating film 120 close to the bus bar 230. In this embodiment, the heating films are attached to the bus bar 230, and heat can be better transferred to the cylindrical battery cells 220 through the bus bar 230.

[0039] The plurality of cylindrical battery cells 220 are electrically connected through the bus bar 230, and at the same time, the bus bar 230 is attached to the ends of the cylindrical battery cells 220. The first heating film 110 and the second heating film 120 are insulating film sheets, arranged on the side of the bus bar 230 away from the cylindrical battery cells 220, covering the bus bar 230, and used for heating the bus bar 230. The first heating film 110 and the second heating film 120 complete the heating process of the plurality of cylindrical battery cells 220 by heating the bus bar 230. When it is necessary to heat the plurality of cylindrical battery cells 220, the first heating film 110 and the second heating film 120 generate heat by themselves to heat the bus bar 230. By setting the first heating film 110 and the second heating film 120 to be attached to the bus bar 230, the heat transfer efficiency between the first heating film 110 and the second heating film 120 and the bus bar 230 can be increased. The heat is evenly transferred to the ends of each cylindrical battery cell 220 through the bus bar 230, realizing uniform heating between each cylindrical battery cell 220. Moreover, the contact mode between the bus bar 230 and the ends of the cylindrical battery cells 220 is surface contact, increasing the heat transfer efficiency between the first heating film 110 and the second heating film 120 and the cylindrical battery cells 220, facilitating use.

[0040] However, in some cases, when the thickness of the first heating film 110 and the second heating film 120 is relatively thin, the difficulty of attaching them is greater. Since a complete plane usually cannot be formed on the bus bar 230, the actual difficulty of attaching the first heating film 110 and the second heating film 120 is relatively large, and they cannot be attached quickly. Usually, it is necessary to increase the thickness or hardness of the first heating film 110 and the second heating film 120 before they can be attached better.

[0041] In one embodiment, in order to reduce the attachment difficulty of the heating film and achieve quick attachment; as Figure 5-6 shown; the battery cell module includes the expandable power battery heating film and at least two battery cell modules 200; the battery cell modules 200 are arranged at intervals in the first direction; the first direction is Figure 5 the D direction in Figure 5 ; the battery cell module 200 includes a plurality of cylindrical battery cells 220 arranged between battery cell brackets 210 and a bus bar 230 arranged on the battery cell brackets 210 and attached to and electrically connected to the ends of the plurality of cylindrical battery cells 220; a heat conducting plate 240 is connected to the bus bar 230; the first heating film 110 or the second heating film 120 is attached to the end face of the heat conducting plate 240 away from the cylindrical battery cells 220; a heat conducting adhesive layer is provided on the side of the first heating film 110 or the second heating film 120 close to the heat conducting plate 240; taking the structure in Figure 5 as an example, it includes two battery cell modules 200; the right side of the lower battery cell module 200 is the head end 201, and the left side of the upper battery cell module 200 is the tail end 202; the second heating film 120 is attached to the lower heat conducting plate 240, the first heating film 110 wraps the heat conducting plates 240 on both sides of the upper battery cell module 200, and then the two battery cell modules 200 are butted and locked by passing long screws through them. A control board module 250 is also connected to the outer end face of the battery cell module 200, and the third wire harness 123 on the second heating film 120 is connected to the control board module 250; the second heating zone 112 on the first heating film 110 is also butted against the heat conducting plate 240 on the other side of the lower battery cell module 200. By providing the heat conducting plate 240, a relatively complete installation surface is provided for the bus bar 230, which can greatly simplify the installation of the heating film. In actual installation, the first heating film 110 or the second heating film 120 can also be first attached to the heat conducting plate 240, and then the heat conducting plate 240 is arranged on the end face of the battery cell module 200.

[0042] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. An expandable power battery heating film, characterized in that: The invention comprises at least one first heating film (110) and at least one second heating film (120); the first heating film (110) comprises a first heating sub-area (111) and a second heating sub-area (112) which are arranged at intervals; the first heating sub-area (111) and the second heating sub-area (112) are connected via a conductive connecting sheet (113); a plurality of the first heating films (110) and the second heating films (120) are arranged at intervals from a head end (201) to an end end (202) along a first direction and are electrically connected to achieve series connection.

2. The expandable power battery heating film according to claim 1, characterized in that: The conductive connecting sheet (113) is a heating film.

3. The expandable power battery heating film according to claim 2, characterized in that: The conductive connecting sheet (113) is provided with a first wiring harness (114) electrically connected to an adjacent first heating film (110) or a second heating film (120); the second heating film (120) is provided with a second wiring harness (122) electrically connected to an adjacent first heating film (110) or a second heating film (120).

4. The expandable power battery heating film according to claim 1, characterized in that: An extension piece (121) is formed on the second heating film (120) and is extended on the same side as the conductive connecting piece (113); and a second wiring harness (122) is provided on the extension piece (121).

5. The expandable power battery heating film according to claim 1, characterized in that: A third wire harness (123) connected to the power supply end is provided on the second heating film (120).

6. The expandable power battery heating film according to claim 1, characterized in that: A plurality of through holes (130) are evenly arranged on the first heating film (110) and the second heating film (120).

7. The expandable power battery heating film according to claim 1, characterized in that: A plurality of the first heating films (110) and the second heating films (120) are arranged at intervals from the head end (201) to the tail end (202) along the first direction and are electrically connected via a conductive sheet (140) to achieve series connection; the conductive sheet (140) and the conductive connecting sheet (113) are made of nickel or copper; and the conductive sheet (140) and the conductive connecting sheet (113) are connected by welding.

8. A battery cell module, characterized in that: It comprises an expandable power battery heating film as described in any one of claims 1 to 7 and at least two battery modules (200); the battery modules (200) are arranged at intervals along a first direction; and the end face of each battery module (200) perpendicular to the first direction is attached to at least one first heating film (110) or a second heating film (120).

9. A battery cell module according to claim 8, characterized in that: The cell module (200) comprises a plurality of cylindrical cells (220) arranged between cell supports (210) and a bus bar (230) arranged on the cell support (210) and fitted with and electrically connected to the ends of the plurality of cylindrical cells (220); the first heating film (110) or the second heating film (120) is attached to the end surface of the bus bar (230) away from the cylindrical cells (220); and a thermally conductive adhesive layer is provided on the side of the first heating film (110) or the second heating film (120) close to the bus bar (230).

10. The battery cell module according to claim 8, characterized in that: The cell module (200) comprises a plurality of cylindrical cells (220) arranged between cell supports (210) and a bus bar (230) arranged on the cell support (210) and fitted with and electrically connected to the ends of the plurality of cylindrical cells (220); a heat conducting plate (240) is connected to the bus bar (230); the first heating film (110) or the second heating film (120) is attached to the end surface of the heat conducting plate (240) away from the cylindrical cells (220); and a heat conducting adhesive layer is provided on the side of the first heating film (110) or the second heating film (120) close to the heat conducting plate (240).

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