Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, and relates to the technical field of batteries. The utility model provides a method. The battery module comprises a battery cell group, the battery cell group comprises a plurality of battery cells, and the plurality of battery cells are arranged in sequence along the thickness direction of the battery cells; the liquid cooling plate is arranged on one side of the battery cell group, the liquid cooling plate deviates from the pole columns of the battery cells, the liquid cooling plate is provided with a cooling channel, and cooling liquid is introduced into the cooling channel to cool the battery cells; and the at least two supporting pieces are connected to the two opposite sides of the liquid cooling plate respectively, and the supporting pieces abut against the battery cell group. The battery module has multiple functions including heating, cooling and expansion resistance, and is relatively high in integration level.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery module and a battery pack. Background Art

[0002] Power batteries have demanding usage scenarios, high performance requirements, compact structure requirements, and high energy density requirements. With the rapid development of the battery industry, the demand for large-scale production of power batteries is increasing.

[0003] However, the functionality of existing power battery modules is insufficient, and therefore there is an urgent need to design a battery module that is physically smaller and has multiple functions. Utility Model Content

[0004] The present application provides a battery module and a battery pack. The battery module has multiple functions including heating, cooling, and anti-expansion, and has a high degree of integration.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A first aspect of the present application provides a battery module, comprising: a battery cell group, the battery cell group comprising a plurality of battery cells, the plurality of battery cells being arranged in sequence along a thickness direction of the battery cells;

[0007] a liquid cooling plate, disposed on one side of the battery cell group, with the liquid cooling plate facing away from the poles of the battery cells, the liquid cooling plate having a cooling channel, the cooling channel being used to pass a coolant to cool the battery cells;

[0008] At least two support members are respectively connected to opposite sides of the liquid cooling plate, and the support members are in contact with the battery cell group.

[0009] In a possible implementation, the support member includes a transverse plate and a side plate, the transverse plate is connected to the liquid cooling plate, and the side plate is connected between the liquid cooling plate and the transverse plate.

[0010] In a possible implementation, there are two side panels, and along the length direction of the transverse panel, the two side panels are respectively connected to opposite sides of the transverse panel.

[0011] In a possible implementation, the transverse plate is provided with a first mounting hole, and the first mounting hole is used to cooperate with the first connecting member to fix the transverse plate;

[0012] And / or, a second mounting hole is provided on the liquid cooling plate, and the second mounting hole is used to cooperate with a second connecting member to fix the liquid cooling plate.

[0013] In a possible implementation, the battery cell group includes two sub-core groups, the two sub-core groups are spaced apart to form a first gap, and the second mounting hole is located in the first gap.

[0014] In a possible implementation, a heating element is further included, and the heating element includes a first heating film. Along the length direction of the battery core, the first heating film is connected to the side surface of the battery core.

[0015] In a possible implementation, an insulating plate is further included, which is arranged between the battery cell group and the support member, the insulating plate is provided with a first connecting hole, and the first heating film is provided with a second connecting hole. The insulating plate is fixedly connected to the first heating film through a third connecting member passing through the first connecting hole and the second connecting hole.

[0016] In a possible implementation, the device further includes an electrical collection component, the electrical collection component including an electrical bracket, a circuit board, and a pole piece, the electrical bracket including a main bracket and a supporting bracket, the main bracket having a protruding portion;

[0017] The pole piece is electrically connected to the pole of the battery cell, and the pole piece is provided with a limiting hole, and the limiting hole is configured to be engaged with the protrusion;

[0018] The circuit board is connected to the electrical bracket and is electrically connected to the pole piece. The circuit board is used to collect the voltage of the pole piece.

[0019] In a possible implementation, the battery cell has a bonding surface, and the bonding surface is used to bond two adjacent battery cells;

[0020] The bonding surface has an adhesive layer, and the projection area of ​​the adhesive layer toward the bonding surface accounts for 70%-80% of the area of ​​the bonding surface.

[0021] The battery module provided in the first aspect of the present application has at least the following beneficial effects:

[0022] The battery module has an efficient cooling module by providing a liquid cooling plate on one side of the battery cell group. In addition, support members are provided on opposite sides of the liquid cooling plate. The support members abut against the battery cells of the battery cell group, which can prevent the battery cell group from expanding. At the same time, the battery module has a compact structure and can be adapted to battery packs of different types and specifications, making it suitable for large-scale production.

[0023] A second aspect of the present application provides a battery pack, comprising a battery module provided by any of the above technical solutions.

[0024] The beneficial effects of the battery pack provided in the second aspect of the present application have all the beneficial effects of the battery module provided in the first aspect of the present application, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the overall structure of the battery module provided in an embodiment of the present application;

[0027] Figure 2 A schematic structural diagram of a cell group of a battery module provided in an embodiment of the present application;

[0028] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of area A in the middle;

[0029] Figure 4 A schematic diagram illustrating the bonding structure between battery cells of a battery cell group provided in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of the structure of the electrical collection component of the battery module provided in an embodiment of the present application;

[0031] Figure 6 A schematic diagram showing the structure of the liquid cooling plate and support member of the battery module provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100. Battery cell group;

[0034] 110, sub-core group;

[0035] 111, battery cell;

[0036] 1111, bonding surface; 1112, first side surface;

[0037] 1111a, adhesive layer; 1111b, insulating intermediate layer;

[0038] 200, liquid cooling plate;

[0039] 210, second mounting hole; 220, faucet; 230, plug;

[0040] 300, support member;

[0041] 310, horizontal plate; 311, first mounting hole;

[0042] 320, side panels;

[0043] 400, heating element;

[0044] 410, first heating film; 411, second connecting hole;

[0045] 500, insulation board;

[0046] 510, first connection hole; 520, wire notch; 530, foam;

[0047] 600, electrical collection components;

[0048] 610, electrical bracket;

[0049] 611, main body bracket; 6111, protrusion;

[0050] 612, support bracket;

[0051] 620, circuit board;

[0052] 630, pole piece; 631, limiting hole.

[0053] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0054] As described in the background, power batteries have demanding applications, high performance requirements, compact structure, and high energy density. With the rapid development of the battery industry, the demand for large-scale production of power batteries is increasing. However, existing power battery modules lack functionality, necessitating the design of a battery module that is physically smaller and combines multiple functions.

[0055] In response to the above technical problems, an embodiment of the present application provides a battery module, which has an efficient cooling module by means of a liquid cooling plate arranged on one side of the battery cell group. In addition, support members are arranged on opposite sides of the liquid cooling plate. The support members and the battery cells of the battery cell group are in contact with each other, which can play an anti-expansion role for the battery cell group. At the same time, the battery module has a compact structure and can be adapted to battery packs of different types and specifications, making it suitable for large-scale production.

[0056] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0057] refer to Figures 1-6 The battery module provided by the embodiment of the present application includes a battery cell group 100, which includes a plurality of battery cells 111. The plurality of battery cells 111 are arranged in sequence, for example, the plurality of battery cells 111 are arranged in an array along the X direction and the Y direction, wherein the X direction is the length direction of the battery cell 111, and the Y direction is the width direction of the battery cell 111, and along the thickness direction of the battery cell 111; a liquid cooling plate 200 is arranged on one side of the battery cell group 111, and the liquid cooling plate 200 is away from the pole of the battery cell 111, and the liquid cooling plate 200 has a cooling channel, and the cooling channel is used to pass a coolant to cool the battery cell 111; at least two support members 300 are respectively connected to opposite sides of the liquid cooling plate 200, and the support members 300 abut against the battery cell group 100 to resist the expansion of the battery cell 111.

[0058] With this design, a liquid cooling plate 200 is provided on one side of the battery cell group 100, thereby providing an efficient cooling module. In addition, support members 300 are provided on opposite sides of the liquid cooling plate 200. The support members 300 are in contact with the battery cells 111 of the battery cell group 100, which can play an anti-expansion role for the battery cell group 100. At the same time, the battery module has a compact structure and can be adapted to battery packs of different types and specifications, making it suitable for large-scale production.

[0059] Illustratively, the battery cell 111 may be a square shell battery cell 111 , which includes a square shell body and a pole, and the pole is located on the top of the square shell body. Alternatively, the battery cell 111 may also be a blade battery cell 111 .

[0060] Furthermore, the liquid cooling plate 200 is a profile, and the liquid cooling plate 200 has a water nozzle 220 arranged on one side of its own plate body. The water nozzle 220 is connected to the cooling channel arranged inside the liquid cooling plate 200. The water nozzle 220 is used to connect an external cooling pipeline to transport coolant to the cooling plate, thereby cooling the battery cell 111 group 100. Exemplarily, there are two water nozzles 220, and the two water nozzles 220 are spaced apart at the edge of one side of the liquid cooling plate 200, or the liquid cooling plate 200 is provided with water nozzles 220 on both opposite sides along the length direction of its own plate body to improve the circulation capacity of the cooling medium. Furthermore, the liquid cooling plate 200 is made of aluminum and has a lightweight structure.

[0061] In some embodiments, the support member 300 includes a horizontal plate 310 and a side plate 320. The horizontal plate 310 is connected to the liquid cooling plate 200, and the side plate 320 is connected between the liquid cooling plate 200 and the horizontal plate 310. For example, the liquid cooling plate 200 is provided with plugs 230 on both sides along its own length direction, which are used to close the cooling channel inside the liquid cooling plate 200 to prevent leakage of the coolant. Furthermore, the horizontal plate 310 is connected to the plug 230, and the two can be processed as one piece, and the structure is relatively stable. The plug 230 and the cooling channel can be connected by welding. For example, the welding process is stir friction welding. Furthermore, the horizontal plate 310 and the side plate 320 are both made of aluminum profiles, and the structure is lightweight.

[0062] In some embodiments, there are two side panels 320 , and along the length direction of the transverse panel 310 , the two side panels 320 are respectively connected to opposite sides of the transverse panel 310 .

[0063] In some embodiments, a first mounting hole 311 is provided on the transverse plate 310, and the first mounting hole 311 is used to cooperate with the first connecting member to fix the transverse plate 310. Further, there are multiple first mounting holes 311, and multiple first mounting holes 311 are spaced apart on the transverse plate 310, and the spacing distance can be 200-300mm. For example, there are four first mounting holes 311, and the four first mounting holes 311 are spaced 250mm apart and are arranged on the transverse plate 310. The first connecting member is a threaded pull rod. In this case, the transverse plate 310 can be fixed by passing through the first mounting hole 311 and the threaded pull rod of the connecting hole provided on the mounting base and corresponding to the first mounting hole 311. For example, the mounting base is an outer shell of an electronic device, or a second mounting hole 210 is provided on the liquid cooling plate 200, and the second mounting hole 210 is used to cooperate with the second connecting member to fix the liquid cooling plate 200. For example, three second mounting holes 210 are arranged at intervals along the length direction of the liquid cooling plate 200, and the second connecting member is a connecting bolt. The liquid cooling plate 200 is fixed to the pre-installation position by passing the connecting bolt through the second mounting hole 210. Alternatively, the first mounting hole 311 and the second mounting hole 210 can be respectively provided on the cross plate 310 and the liquid cooling plate 200 to enhance the fixing effect of the liquid cooling plate 200, thereby improving the installation stability of the battery module.

[0064] In some embodiments, the battery cell 111 group 100 includes two sub-core groups 110, and the two sub-core groups 110 are spaced apart to form a first gap, and the second mounting hole 210 is located in the first gap. In this way, the setting of the first gap makes it easy for staff to enter the first gap to use the second connecting member and the second mounting hole 210 to fix the liquid cooling plate 200. For example, the liquid cooling plate 200 can be fixed on the chassis wall of the electronic device.

[0065] Furthermore, the length of the battery cell 111 group 100 is less than 1000 mm, the width is less than 600 mm, and the first gap is in the size range of 15-30 mm. For example, the size of the first gap is 15 mm, or the size of the first gap is 22 mm, or the size of the first gap is 30 mm.

[0066] In some embodiments, a heating element 400 is further included, and the heating element 400 includes a first heating film 410. Along the length direction of the battery cell 111, the first heating film 410 is connected to the side of the battery cell 111. For example, the first heating film 410 is a polyimide (PI) heating film, which is resistant to high temperature, chemical corrosion and has good electrical insulation. In this way, the first heating film 410 can be used to heat the battery cell 111 group 100 on one side from the outer side thereof, and the number and power of the heating film can be flexibly adjusted according to the heating requirements. Furthermore, the first heating film 410 is bonded to the side of the battery cell 111 by a thermally conductive structural adhesive to enhance the connection stability and ensure thermal conductivity.

[0067] Furthermore, the heating element 400 also includes a second heating film. The battery cell group 100 includes two sub-core groups 110. Each sub-core group 110 includes two columns of battery cells 111. Each column of battery cells 111 includes multiple battery cells 111. The second heating film is arranged between the two columns of battery cells 111. For example, the second heating film is a silicone heating film.

[0068] In some embodiments, an insulating plate 500 is further included. The insulating plate 500 is arranged between the battery cell 111 group 100 and the support member 300. Specifically, the insulating plate 500 is arranged on the outside of the first side surface 1112 of the outermost battery cell 111 of the battery cell 111 group 100 along its own length direction. The insulating plate 500 is provided with a first connection hole 510, and the first heating film 410 is provided with a second connection hole 411. The insulating plate 500 is fixedly connected to the first heating film 410 by a third connecting member passing through the first connection hole 510 and the second connection hole 411. For example, the third connecting member can be a rivet. In this embodiment, the insulating plate 500 can provide a connection position for the first heating film 410 to simplify the module structure. Furthermore, the insulating plate 500 is also provided with a wire outlet notch. For example, the wire outlet notch is provided at the edge of the insulating plate 500 close to the battery cell 111 pole side to facilitate the outlet of the wiring structure of the first heating film 410.

[0069] Exemplarily, the insulating plate 500 is an insulating plastic plate with a thickness of 2-4 mm. The two insulating plastic plates are respectively attached to the outer sides of the battery cells 111 at both ends of the sub-core group 110 along its own length direction, and foam 530 is also provided between the insulating plastic plate and the sub-core group 110. The thickness of the foam 530 is 1.5-2.5 mm.

[0070] In some embodiments, an electrical collection component 600 is also included. The electrical collection component 600 includes an electrical bracket 610, a circuit board 620 and a pole piece 630. The electrical bracket 610 includes a main bracket 611 and a support bracket 612. The main bracket 611 has a protrusion 6111; the pole piece 630 is electrically connected to the pole of the battery cell 111. The pole piece 630 is provided with a limiting hole, and the limiting hole is constructed to be engaged with the protrusion 6111; the circuit board 620 is connected to the electrical bracket 610 and electrically connected to the pole piece 630. The circuit board 620 is used to collect the voltage of the pole piece 630.

[0071] Furthermore, the circuit board 620 is a flexible die-cut low-voltage collection circuit board, which is formed by a die-cutting process. Part of the structure of the circuit board 620 is arranged on the main bracket 611. The circuit board 620 has a connector, and the connector is connected to the support bracket 612. The main bracket 611 is a blister bracket, which is a plastic bracket manufactured by a blister process (also known as vacuum forming). The support bracket 612 is an injection molded bracket, which is a plastic bracket manufactured by an injection molding process.

[0072] In some embodiments, the battery cell 111 has a bonding surface 1111, and the bonding surface 1111 is used to bond two adjacent battery cells 111; the bonding surface 1111 has an adhesive layer 1111a, and the projection area of ​​the adhesive layer 1111a toward the bonding surface 1111 accounts for 70%-80% of the area of ​​the bonding surface 1111, for example, the projection area of ​​the adhesive layer 1111a toward the bonding surface 1111 accounts for 70% of the area of ​​the bonding surface 1111, or the projection area of ​​the adhesive layer 1111a toward the bonding surface 1111 accounts for 75% of the area of ​​the bonding surface 1111, or the projection area of ​​the adhesive layer 1111a toward the bonding surface 1111 accounts for 80% of the area of ​​the bonding surface 1111.

[0073] Exemplarily, a glue layer 1111a is provided on the bonding surface 1111 by a glue spraying process. The glue layer 1111a is a polyurethane structural glue that cures rapidly upon heating. The glue is sprayed onto the bonding surface 1111 of the battery cell 111 using a spraying device. The lower limit of the glue spraying amount can be controlled to ensure the bonding effect. An insulating intermediate layer 1111b is also bonded between the glue layers 1111a of two adjacent battery cells 111. The insulating intermediate layer 1111b is a high thermal resistance foam 530. In a second aspect, embodiments of the present application provide a battery pack, which includes the battery module provided by any embodiment of the first aspect and also has all the beneficial effects of the battery module of this aspect, which will not be repeated here.

[0074] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0076] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0077] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0078] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0079] It should be noted that phrases such as "one embodiment," "an embodiment," "exemplary embodiments," and "some embodiments" in this specification may indicate embodiments that may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery module, characterized in that: include: A battery cell group (100), the battery cell group (100) comprising a plurality of battery cells (111), the plurality of battery cells (111) being arranged in sequence along a thickness direction of the battery cells (111); a liquid cooling plate (200) disposed on one side of the battery cell group (100), with the liquid cooling plate (200) facing away from the pole of the battery cell (111); the liquid cooling plate (200) having a cooling channel, the cooling channel being used to allow cooling liquid to flow into to cool the battery cell (111); At least two support members (300) are respectively connected to opposite sides of the liquid cooling plate (200), and the support members (300) are in contact with the center of the battery cell group (100).

2. The battery module according to claim 1, wherein: The support member (300) includes a transverse plate (310) and a side plate (320), wherein the transverse plate (310) is connected to the liquid cooling plate (200), and the side plate (320) is connected between the liquid cooling plate (200) and the transverse plate (310).

3. The battery module according to claim 2, characterized in that: There are two side panels (320), and along the length direction of the transverse panel (310), the two side panels (320) are respectively connected to opposite sides of the transverse panel (310).

4. The battery module according to claim 2, characterized in that: The transverse plate (310) is provided with a first mounting hole (311), and the first mounting hole (311) is used to cooperate with a first connecting member to fix the transverse plate (310); And / or, a second mounting hole (210) is provided on the liquid cooling plate (200), and the second mounting hole (210) is used to cooperate with a second connecting member to fix the liquid cooling plate (200).

5. The battery module according to claim 4, characterized in that: The battery cell group (100) comprises two sub-core groups (110), the two sub-core groups (110) are spaced apart to form a first gap, and the second mounting hole (210) is located in the first gap.

6. The battery module according to any one of claims 1 to 5, characterized in that: The invention also includes a heating element (400), wherein the heating element (400) includes a first heating film (410), and the first heating film (410) is connected to the side surface of the battery core (111) along the length direction of the battery core (111).

7. The battery module according to claim 6, characterized in that: The invention also includes an insulating plate (500), the insulating plate (500) being arranged between the battery cell group (100) and the support member (300), the insulating plate (500) being provided with a first connection hole (510), the first heating film (410) being provided with a second connection hole (411), and the insulating plate (500) being fixedly connected to the first heating film (410) via a third connection member passing through the first connection hole (510) and the second connection hole (411).

8. The battery module according to any one of claims 1 to 5, characterized in that: The device further comprises an electrical collection component (600), wherein the electrical collection component (600) comprises an electrical support (610), a circuit board (620), and a pole piece (630), wherein the electrical support (610) comprises a main support (611) and a supporting support (612), and wherein the main support (611) has a protruding portion (6111); The pole piece (630) is electrically connected to the pole of the battery cell (111), and the pole piece (630) is provided with a limiting hole, and the limiting hole is configured to be engaged with the protruding portion (6111); The circuit board (620) is connected to the electrical bracket (610) and is electrically connected to the pole piece (630). The circuit board (620) is used to collect the voltage of the pole piece (630).

9. The battery module according to any one of claims 1 to 5, characterized in that: The battery core (111) has a bonding surface (1111), and the bonding surface (1111) is used for bonding two adjacent battery cores (111); The bonding surface (1111) has a glue layer (1111a), and the projection area of ​​the glue layer (1111a) toward the bonding surface (1111) accounts for 70%-80% of the area of ​​the bonding surface (1111).

10. A battery pack, characterized in that: A battery module comprising any one of claims 1 to 9.

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