Secondary battery module

Abstract

The utility model provides a secondary battery module. The secondary battery module comprises a first plate and heat-conducting glue arranged on the first plate, the plurality of battery cells are arranged on the first plate side by side along the thickness direction of the battery cells, and the first end parts of the plurality of battery cells are connected to the first plate through heat-conducting glue; one end of an electrode current collector of the battery cell is connected with at least one tab of the battery cell, and the other end of the electrode current collector of the battery cell extends out of the shell; the outer edge of the first protective heat-conducting film in the extending direction is closer to the outer edge of the electrode current collector than the outer edge of the shell, and the inner edge, opposite to the outer edge, of the first protective heat-conducting film in the direction opposite to the extending direction at least crosses the boundary line of the shell and the electrode current collector. And the width of the first protective heat-conducting film in the extension direction of the boundary line is not less than that of the electrode current collector. The shell can be protected at least, and the probability that water vapor enters the shell to damage the secondary battery module can be reduced.

Description

Technical Field

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

[0002] With the development of the new energy industry, batteries (especially lithium-ion batteries) are widely used in life. Among them, battery cells are divided into cylindrical, square shell and soft pack. Due to mileage anxiety and charging time anxiety, the capacity of battery cells is getting larger and larger, and the fast charging time is getting shorter and shorter. In the same time, the heat generated by charging and discharging of battery cells is getting larger and larger.

[0003] Figure 1 Schematic diagram of the front view of a bare battery cell 50 in the prior art. Figure 1 As shown, usually, the bare cell 50 has a certain welding impedance at the welding position due to the structure of welding the tab 51 and the electrode collector 52. A large amount of heat will be generated during high current charging and discharging. The generated heat will be transferred to the positive tab, the negative tab and the cell large surface 53, making the soft-pack cell 60 (see Figure 2 ) has different temperature rises at different locations. The soft pack battery 60 (see Figure 2 ) has a higher local temperature rise. In addition, the higher temperature rise at the welding position will accelerate the consumption of local electrolyte, resulting in local performance deterioration.

[0004] Figure 2 Schematic diagram of the front view of the soft pack battery 60 in the prior art. Figure 2 As shown, since the soft-pack battery 60 is packaged with an aluminum-plastic film, the metal layer in the middle of the outer shell 61 on the side where the electrode collector 52 is located (not shown in the main view) will be exposed to the outside (the metal layer of the outer shell 61 is sandwiched between the two insulating layers of the outer shell 61. When observed in the left / right view, the metal layer is exposed to the air and is not completely wrapped by the insulating layer of the outer shell 61). The metal layer of the outer shell 61 is more likely to be corroded, and for example, water vapor may pass through the exposed metal layer to destroy the bonding strength of the multi-layer structure of the outer shell 61; in addition, when metal foreign matter, water droplets, or leaked electrolyte falls on the connection between the metal layer of the outer shell 61 and the electrode collector 52, the metal layer of the outer shell 61 is electrically connected to the electrode collector 52, forming an electron channel, thereby causing electrochemical corrosion of the soft-pack battery 60 and reducing the insulation performance.

[0005] Figure 3 2 is a schematic diagram of a secondary battery module 70 in the prior art. Figure 3As shown, the metal layer in the middle of the outer shell 61 on the side where the electrode collector 52 is located is exposed. The thermal conductive adhesive 71 of the current secondary battery module 70 is all at the bottom of the secondary battery module 70, that is, it is arranged between the bottom of the secondary battery cell 60 and the bottom plate 72 of the secondary battery module 70, resulting in a smaller temperature rise at the bottom of the secondary battery cell 60 close to the thermal conductive adhesive 71, but the heat at the top of the secondary battery cell 60 far away from the thermal conductive adhesive 71 cannot be conducted to the bottom of the secondary battery cell 60 in time. There is a temperature difference between the top and bottom of the secondary battery cell 60, which will accelerate the performance deterioration of the secondary battery cell 60. Utility Model Content

[0006] In view of the above problems existing in the prior art, an embodiment of the present application proposes a secondary battery module, which can at least protect the outer shell, reduce the probability of water vapor entering the outer shell and damaging the secondary battery module, and can also reduce the overall temperature rise of the battery cell.

[0007] According to one aspect of the present application, a secondary battery module is provided, the secondary battery module comprising: a first plate and a thermally conductive adhesive arranged on the first plate; a plurality of battery cells arranged side by side on the first plate along the thickness direction of the battery cells, the first ends of the plurality of battery cells being connected to the first plate through the thermally conductive adhesive; and a first protective thermally conductive film, contacting at least a portion of the outer shell of the battery cell, and extending to the thermally conductive adhesive to be thermally connected to the thermally conductive adhesive, wherein one end of the electrode collector of the battery cell is connected to at least one pole ear of the battery cell and the other end extends outside the outer shell, in the direction of extension, the outer edge of the first protective thermally conductive film is closer to the outer edge of the electrode collector than the outer edge of the outer shell, in the direction opposite to the extension direction, the inner edge of the first protective thermally conductive film opposite to the outer edge at least crosses the boundary line between the outer shell and the electrode collector, and in the extension direction of the boundary line, the width of the first protective thermally conductive film is not less than the width of the electrode collector. The secondary battery module of the present application can at least protect the outer shell, reducing the probability of water vapor entering the outer shell and damaging the secondary battery module, for example. In addition, the first protective thermally conductive film is extended to be thermally connected to the thermally conductive adhesive, which can at least reduce the overall temperature rise of the battery cells in the secondary battery module, improve the temperature rise consistency of the battery cells, and thus increase the cycle life of the battery cells.

[0008] In one or more embodiments, the bottom plate of the housing of the secondary battery module constitutes the first plate, and the first protective thermally conductive film extends along the side surface of the battery cell from the second end of the battery cell opposite to the first end to the first end of the battery cell until it is thermally connected to the thermally conductive adhesive. The secondary battery module of the present application can at least further quickly conduct the heat of the second end of the battery cell to the thermally conductive adhesive on the first plate, balance the temperature of the first end and the second end of the battery cell, and further improve the temperature rise consistency of the battery cell, thereby improving the cycle life of the battery cell and improving the durability of the secondary battery module.

[0009] The electrode collector of the battery cell of the present application can have a variety of settings. In one or more embodiments, the electrode collector includes a positive electrode collector and a negative electrode collector located on two opposite side surfaces of the battery cell. In one or more embodiments, the electrode collector includes a positive electrode collector and a negative electrode collector located on the same side of the battery cell.

[0010] In one or more embodiments, the positive electrode collector and the negative electrode collector are arranged on one side of the two opposite side surfaces of the battery cell, and the other side of the two opposite side surfaces is also provided with a second protective thermally conductive film, and the second protective thermally conductive film extends along the other side from the second end of the battery cell to the first end of the battery cell until it is thermally connected to the thermally conductive adhesive. The secondary battery module of the present application includes the second protective thermally conductive film, which can further improve the temperature rise consistency of the battery cell, thereby improving the cycle life of the battery cell.

[0011] In one or more embodiments, the first protective thermally conductive film further extends to cover a portion of the electrode collector. The first protective thermally conductive film in the secondary battery module of the present application covers the metal layer of the outer shell and extends to cover a portion of the electrode collector, that is, the first protective thermally conductive film covers the boundary between the electrode collector and the metal layer of the outer shell, which can further protect the metal layer of the outer shell from corrosion, and reduce the probability of water vapor entering and damaging the outer shell. In addition, the first protective thermally conductive film in the secondary battery module of the present application covers a portion of the electrode collector, which can at least quickly conduct the heat from the electrode collector and the welding point between the electrode tab (not shown) and the electrode collector to the thermally conductive adhesive through the first protective thermally conductive film, thereby reducing the overall temperature rise of the battery cell, improving the temperature rise consistency of the battery cell, and improving the cycle life of the battery cell.

[0012] In one or more embodiments, the distance from the outer edge of the first protective thermally conductive film on the electrode collector to the boundary line is 5 mm to 15 mm. The secondary battery module of the present application can ensure the protection of the shell and improve the temperature rise consistency of the battery cell while using a protective thermally conductive film of appropriate length to control costs.

[0013] In one or more embodiments, the first protective thermally conductive film at least contacts the metal layer of the outer shell at the boundary between the outer shell of the battery cell and the electrode collector. In the secondary battery module of the present application, since the first protective thermally conductive film covers the exposed metal layer of the outer shell at the electrode collector, it can prevent foreign metal foreign matter, water droplets or leaked electrolyte from falling between the metal layer and the electrode collector, causing the metal layer to be corroded or the outer shell to be damaged. In one or more embodiments, the thickness of the first protective thermally conductive film on the metal layer is 0.1mm to 1mm. The secondary battery module of the present application can ensure the protection of the outer shell and improve the temperature rise consistency of the battery cell, while using a protective thermally conductive film of appropriate thickness, controlling costs, and avoiding the influence of an excessively thick protective thermally conductive film on the assembly of the battery cell in the module, and the existing module structure can be used.

[0014] In one or more embodiments, the shell is an aluminum-plastic film shell, and the metal layer is an aluminum layer. By adopting the aluminum-plastic film shell used in the mainstream of soft-pack batteries, the best balance between material cost and structural strength can be achieved. In some embodiments, the present disclosure can particularly solve the problem of possible corrosion of the metal aluminum layer in the aluminum-plastic film shell or the problem of weakened bonding strength of the bonding layer when the shell is a multi-layer structure.

[0015] In one or more embodiments, the first protective heat-conducting film is an insulating film, which can improve the insulation of the secondary battery module and prevent electrochemical corrosion caused by foreign metal matter, water droplets or leaked electrolyte falling between the metal layer and the electrode collector.

[0016] The beneficial technical effects of the utility model are:

[0017] The secondary battery module of the embodiment of the present application includes a first protective heat-conductive film in contact with at least a portion of the outer shell of the battery cell, and in the extension direction of the electrode collector, the outer edge of the first protective heat-conductive film is closer to the outer edge of the electrode collector than the outer edge of the outer shell, wherein, in the direction opposite to the above-mentioned extension direction, the inner edge of the first protective heat-conductive film opposite to the outer edge at least crosses the boundary line between the outer shell and the electrode collector, and in the width direction perpendicular to the above-mentioned extension direction, the width of the first protective heat-conductive film is not less than the width of the electrode collector, which can at least protect the outer shell and reduce the probability of, for example, water vapor entering the outer shell and damaging the secondary battery module; in addition, the first protective heat-conductive film is extended to be thermally connected to the thermally conductive adhesive, which can at least reduce the overall temperature rise of the battery cell in the secondary battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. It is worth noting that according to the standard practice of the industry, the various components are not drawn to scale and are only used for illustration purposes. In fact, for the clarity of discussion, the size of each component can be arbitrarily increased or reduced.

[0019] Figure 1 It is a main schematic diagram of a bare battery cell in the prior art.

[0020] Figure 2 It is a main schematic diagram of a soft-pack battery cell in the prior art.

[0021] Figure 3 It is a left view schematic diagram of a secondary battery module in the prior art.

[0022] Figure 4 It is a left schematic view of a secondary battery module according to an embodiment of the present application.

[0023] Figure 5 It is a front view schematic diagram of a battery cell according to an embodiment of the present application.

[0024] Figure 6 It is a front view schematic diagram of a battery cell according to another embodiment of the present application.

[0025] Figure 7 Shown is Figure 5 A corresponding front view schematic diagram of a battery cell without the first protective thermal conductive film.

[0026] Figure 8 Shown is Figure 6 A corresponding front view schematic diagram of a battery cell without the first protective thermal conductive film.

[0027] Fig. 9 It is a front view schematic diagram of a secondary battery module according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0029] The following disclosure provides many different embodiments or examples for realizing the different features of the provided subject matter. Specific examples of components and arrangements will be described below to simplify the present invention. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in various examples. This repetition is only for simplicity and clarity and does not itself represent the relationship between the various embodiments and / or configurations discussed.

[0030] In addition, the embodiments in the present application and the features in the embodiments may be combined with each other in the absence of conflicts. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be understood that the specific structures shown in the drawings are only for the sake of convenience of explanation and are not intended to limit the present application. When describing a specific figure, other structures not described in the drawings may be provided according to actual needs and are not intended to limit the present application.

[0031] Figure 4 1 is a left schematic view of a secondary battery module 100 according to an embodiment of the present application. Figure 51 is a front view schematic diagram of a battery cell 10 according to an embodiment of the present application. Figure 6 1 is a front view schematic diagram of a battery cell 10 according to another embodiment of the present application. Figure 7 Shown is Figure 5 A corresponding front view of the battery cell 10 without the first protective thermal conductive film 41 is shown. Figure 8 Shown is Figure 6 A corresponding front view of the battery cell 10 without the first protective thermal conductive film 41 is shown. Fig. 9 1 is a schematic front view of a secondary battery module 100 according to an embodiment of the present application. Figure 4-Figure 9 This application is described.

[0032] The secondary battery module 100 provided in the present application includes a first plate 30 and a thermally conductive adhesive 20 disposed on the first plate 30, a plurality of battery cells 10 and a first protective thermally conductive film 41, wherein the plurality of battery cells 10 are arranged side by side on the first plate 30 along the thickness direction of the battery cells 10, the first ends 11 of the plurality of battery cells 10 are connected to the first plate 30 through the thermally conductive adhesive 20, the first protective thermally conductive film 41 is in contact with at least a portion of the outer shell 17 of the battery cell 10, and the first protective thermally conductive film 41 extends to the thermally conductive adhesive 20 to be thermally connected to the thermally conductive adhesive 20, wherein the ... 0 is connected to at least one pole ear of the battery cell 10 and the other end extends to the outside of the shell 17. In the above extension direction, the outer edge of the first protective thermally conductive film 41 is closer to the outer edge of the electrode collector 19 than the outer edge of the shell 17. In the direction opposite to the above extension direction, the inner edge of the first protective thermally conductive film 41 opposite to the outer edge at least crosses the boundary line between the shell 17 and the electrode collector 19. In the extension direction of the boundary line, the width of the first protective thermally conductive film 41 is not less than the width of the electrode collector 19. The secondary battery module 100 of the present application includes the first protective thermally conductive film 41 in contact with at least a portion of the shell 17 of the battery cell 10, which can at least protect the shell 17 and reduce the probability of water vapor entering the shell and damaging the secondary battery module. In addition, the first protective thermally conductive film 41 extends to be thermally connected to the thermally conductive adhesive 20 , which can at least reduce the overall temperature rise of the battery cell 10 in the secondary battery module 100 , improve the temperature rise consistency of the battery cell 10 , and thus improve the cycle life of the battery cell 10 .

[0033] refer to Figure 4As shown, in the embodiment of the present application, the X direction is the thickness direction of the battery cell 10, the Y direction is the extension direction of the electrode collector 19, the Y direction is perpendicular to the paper surface and outward, and the Z direction is the extension direction of the boundary line between the outer shell 17 and the electrode collector 19, wherein the width of the first protective thermal conductive film 41 is the dimension along the extension direction of the boundary line between the outer shell 17 and the electrode collector 19 (that is, along the Z direction), and the width of the electrode collector 19 is the dimension along the extension direction of the boundary line between the outer shell 17 and the electrode collector 19 (that is, along the Z direction).

[0034] In some embodiments, the first protective thermally conductive film 41 at least contacts the metal layer of the outer shell 17 at the boundary between the outer shell 17 of the battery cell 10 and the electrode collector 19. In the secondary battery module 100 of the present application, since the first protective thermally conductive film 41 covers the exposed metal layer of the outer shell 17 at the electrode collector 19, it can prevent foreign metal foreign matter, water droplets or leaked electrolyte from falling between the metal layer and the electrode collector 19, resulting in corrosion of the metal layer or damage to the outer shell 17.

[0035] In some embodiments, the first protective thermally conductive film 41 is an insulating film, which can at least improve the insulation of the secondary battery module 100. Due to the presence of the insulating film, it can prevent metal foreign matter, water droplets or leaked electrolyte from falling between the metal layer and the electrode collector 19, thereby avoiding electrochemical corrosion and improving the insulation of the secondary battery module 100.

[0036] It should be understood that the first protective thermal conductive film 41 of the present application may only cover the exposed metal layer at the electrode collector 19, and the first protective thermal conductive film 41 of the present application may further extend to completely cover all the exposed metal layers. Figure 7 and Figure 8 In the shell, the metal layer can be seen, that is, the metal layer is exposed. Figure 4 , Figure 5 and Figure 6 In the embodiment, the exposed metal layer is completely covered by the first protective heat-conducting film 41 .

[0037] Although the figure shows that the first protective thermally conductive film 41 contacts all the exposed metal layers and covers the exposed metal layers, it should be understood that the first protective thermally conductive film 41 may only contact part of the metal layer, that is, in the extension direction of the electrode collector 19, the outer edge of the first protective thermally conductive film 41 is closer to the outer edge of the electrode collector 19 than the outer edge of the outer shell 17, and in the direction opposite to the above-mentioned extension direction, the inner edge of the first protective thermally conductive film 41 opposite to the outer edge at least crosses the boundary line between the outer shell 17 and the electrode collector 19, and in the extension direction of the boundary line, the width of the first protective thermally conductive film 41 is not less than the width of the electrode collector 19.

[0038] In some embodiments, the housing 17 is an aluminum-plastic film housing, and the metal layer is an aluminum layer.

[0039] refer to Figure 4 As shown, in some embodiments, the first plate 30 may be the bottom plate of the housing of the secondary battery module 100, or the top plate of the housing of the secondary battery module 100. In some embodiments, for example Figure 5 It is shown that the electrode collector 19 of the battery cell 10 includes a positive electrode collector 191 and a negative electrode collector 192, and the positive electrode collector 191 and the negative electrode collector 192 are located on two opposite side surfaces of the battery cell 10 in a one-to-one correspondence. Figure 6 The electrode collector 19 of the battery cell 10 is shown to include a positive electrode collector 191 and a negative electrode collector 192. The positive electrode collector 191 and the negative electrode collector 192 are located on the same side of the battery cell 10. Figure 6 1 shows that the positive electrode collector 191 and the negative electrode collector 192 are located on one side surface of the battery cell 10, but according to actual needs, the positive electrode collector 191 and the negative electrode collector 192 can both be located at the top 13 of the battery cell 10. It should be understood that the multiple battery cells 10 in the secondary battery module 100 are of the same type.

[0040] Figure 6 As shown in the figure, the positive electrode collector 191 and the negative electrode collector 192 are arranged on one side of the two opposite side surfaces of the battery cell 10, and the other side of the two opposite side surfaces may also be provided with a second protective thermally conductive film 42, and the second protective thermally conductive film 42 extends along the other side from the second end 13 of the battery cell 10 opposite to the first end 11 to the first end 11 of the battery cell 10 until it is thermally connected to the thermally conductive adhesive 20. It should be understood that the second protective thermally conductive film 42 may be provided or not provided according to actual needs. When the secondary battery module 100 includes the second protective thermally conductive film 42, the temperature rise consistency of the battery cell 10 can be further improved, thereby improving the cycle life of the battery cell 10.

[0041] In some embodiments, the bottom plate of the shell of the secondary battery module 100 constitutes the first plate 30, and the first protective thermally conductive film 41 extends along the side surface of the battery cell 10 from the second end 13 of the battery cell 10 opposite to the first end 11 to the first end 11 of the battery cell 10 until it is thermally connected to the thermally conductive adhesive 20, so as to transfer the heat of the top 13 to the thermally conductive adhesive 20. When the bottom plate of the shell of the secondary battery module 100 constitutes the first plate 30, the first end 11 is the bottom of the battery cell 10, and the second end 13 is the top of the battery cell 10. The secondary battery module 100 of the present application can at least further quickly conduct the heat of the second end 13 of the battery cell 10 to the thermally conductive adhesive 20 on the first plate 30 of the secondary battery module 100, balance the overall temperature of the battery cell 10, and further improve the temperature rise consistency of the battery cell 10, thereby improving the cycle life of the battery cell 10 and improving the durability of the secondary battery module 100.

[0042] In some embodiments, the first protective thermally conductive film 41 further extends to cover a portion of the electrode collector 19, and obviously, does not cover the entire electrode collector 19. The first protective thermally conductive film 41 in the secondary battery module 100 of the present application covers at least a portion of the electrode collector 19, and the heat of the electrode collector 19 and the welding point between the tab (not shown) and the electrode collector 19 can be quickly transferred to the thermally conductive adhesive 20 through the first protective thermally conductive film 41, thereby reducing the overall temperature rise of the battery cell 10, improving the temperature rise consistency of the battery cell 10, and improving the cycle life of the battery cell 10.

[0043] In some embodiments, the distance from the outer edge of the first protective thermally conductive film 41 on the electrode collector 19 to the boundary line between the outer shell 17 and the electrode collector 19 is 5 mm to 15 mm. The secondary battery module 100 of the present application can ensure the protection of the outer shell 17 and improve the temperature rise consistency of the battery cell 10, while using a first protective thermally conductive film 41 of appropriate length to control costs.

[0044] In some embodiments, the thickness of the first protective thermally conductive film 41 on the metal layer is 0.1 mm to 1 mm. The secondary battery module 100 of the present application can ensure the protection of the housing 17 and improve the temperature rise consistency of the battery cell 10, while using the first protective thermally conductive film 41 of appropriate thickness, controlling costs, and avoiding the influence of the overly thick first protective thermally conductive film 41 on the assembly of the battery cell 10 in the module, and the existing module structure can be used.

[0045] It should be understood that the battery cell 10 in the present application may include an electrode assembly (not shown), a shell 17, and an electrode collector 19 electrically connected to the electrode assembly, wherein the electrode assembly is disposed in the shell 17, and the electrode collector 19 extends out of the shell 17 from the sealing portion of the shell 17. The first protective thermally conductive film 41 and the second protective thermally conductive film 42 in the present application may be flexible films with good thermal conductivity and excellent insulation, for example, insulating thermally conductive organic silicone films or insulating thermally conductive inorganic silicone films. The secondary battery module of the present application may be a soft-pack battery module.

[0046] The secondary battery module provided by the present application adds a first protective heat-conductive film, and the first protective heat-conductive film contacts at least a part of the outer shell of the battery cell. In the extension direction of the electrode collector, the outer edge of the first protective heat-conductive film is closer to the outer edge of the electrode collector than the outer edge of the outer shell. In the direction opposite to the above extension direction, the inner edge of the first protective heat-conductive film opposite to the outer edge at least crosses the boundary line between the outer shell and the electrode collector. In the extension direction of the boundary line between the outer shell and the electrode collector, the width of the first protective heat-conductive film is not less than the width of the electrode collector, that is, the first protective heat-conductive film covers a part of the shell, and at least can protect the shell, reducing the probability of water vapor entering the shell and damaging the secondary battery module. In addition, the first protective heat-conductive film in the secondary battery module provided by the present application extends to be thermally connected with the thermally conductive adhesive, which can at least reduce the overall temperature rise of the battery cell in the secondary battery module, improve the temperature rise consistency of the battery cell, and improve the cycle life of the battery cell. The first protective thermally conductive film in the secondary battery module of the present application extends along the side surface of the battery cell from the second end of the battery cell to the first end of the battery cell until it is thermally connected to the thermally conductive adhesive, so as to transfer the heat of the second end to the thermally conductive adhesive, which can at least accelerate the overall heat transfer of the battery cell, further improve the consistency of the temperature rise of the battery cell, and increase the service life.

[0047] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A secondary battery module (100), characterized in that: include: A first plate (30) and a thermally conductive adhesive (20) disposed on the first plate (30); A plurality of battery cells (10) are arranged side by side on the first plate (30) along the thickness direction of the battery cells (10), and the first ends (11) of the plurality of battery cells (10) are connected to the first plate (30) via the thermally conductive adhesive (20); as well as A first protective heat-conductive film (41) contacts at least a portion of the outer shell (17) of the battery cell (10) and extends to the heat-conductive adhesive (20) to be heat-conductively connected to the heat-conductive adhesive (20). One end of the electrode collector (19) of the battery cell (10) is connected to at least one pole ear of the battery cell (10) and the other end extends outside the outer shell (17); in the direction of the extension, the outer edge of the first protective thermally conductive film (41) is closer to the outer edge of the electrode collector (19) than the outer edge of the outer shell (17); in the direction opposite to the extension direction, the inner edge of the first protective thermally conductive film (41) opposite to the outer edge at least crosses the boundary line between the outer shell (17) and the electrode collector (19); in the extension direction of the boundary line, the width of the first protective thermally conductive film (41) is not less than the width of the electrode collector (19).

2. The secondary battery module (100) according to claim 1, characterized in that: The bottom plate of the housing of the secondary battery module (100) constitutes the first plate (30), The first protective heat-conductive film (41) extends along the side surface of the battery cell (10) from a second end (13) of the battery cell (10) opposite to the first end (11) to the first end (11) of the battery cell (10) until being heat-conductively connected to the heat-conductive adhesive (20).

3. The secondary battery module (100) according to claim 2, characterized in that: The electrode collector (19) includes a positive electrode collector (191) and a negative electrode collector (192) located on two opposite side surfaces of the battery cell (10).

4. The secondary battery module (100) according to claim 2, characterized in that: The electrode collector (19) comprises a positive electrode collector (191) and a negative electrode collector (192) located on the same side of the battery cell (10).

5. The secondary battery module (100) according to claim 4, characterized in that: The positive electrode collector (191) and the negative electrode collector (192) are arranged on one side of two opposite side surfaces of the battery cell (10). A second protective heat-conductive film (42) is also provided on the other side of the two opposite side surfaces, and the second protective heat-conductive film (42) extends along the other side from the second end (13) of the battery cell (10) to the first end (11) of the battery cell (10) until it is thermally connected to the heat-conductive adhesive (20).

6. The secondary battery module (100) according to claim 1, characterized in that: The first protective heat-conductive film (41) further extends to cover a portion of the electrode collector (19).

7. The secondary battery module (100) according to claim 6, characterized in that: The distance from the outer edge of the first protective heat-conductive film (41) on the electrode collector (19) to the boundary line is 5 mm to 15 mm.

8. The secondary battery module (100) according to claim 1, characterized in that: The first protective heat-conductive film (41) contacts at least the metal layer of the outer shell (17) at the boundary between the outer shell (17) of the battery cell (10) and the electrode collector (19).

9. The secondary battery module (100) according to claim 8, characterized in that: The thickness of the first protective heat-conductive film (41) on the metal layer is 0.1 mm to 1 mm.

10. The secondary battery module (100) according to claim 8, characterized in that: The shell (17) is an aluminum-plastic film shell, and the metal layer is an aluminum layer.

11. The secondary battery module (100) according to claim 1, characterized in that: The first protective heat-conductive film (41) is an insulating film.

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