Battery module and battery pack

Abstract

The invention belongs to the technical field of batteries, and discloses a battery module and a battery pack. The battery module comprises a plurality of battery cells, a first heat conduction structure, a second heat conduction structure and an accommodating space, and the first heat conduction structure is clamped between the adjacent battery cells; the second heat-conducting structure is matched with the first heat-conducting structure, and the first heat-conducting structure can move relative to the second heat-conducting structure; the plurality of battery cells, the first heat conduction structure and the second heat conduction structure are arranged in the accommodating space in a matching manner; and when at least one battery cell expands along the normal direction of the main side surface of the battery cell, the first heat conduction structure can move relative to the second heat conduction structure so as to change from a first opposite position state to a second opposite position state. Through the arrangement, the first heat conduction structure can be prevented from extruding the battery cell which generates expansion deformation, so that heat in the battery cell is more easily dissipated outwards and is prevented from being accumulated in the battery cell, the battery module can always keep relatively good heat dissipation performance and is prevented from being overheated, and the use safety of the battery cell is ensured.

Description

Technical Field

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

[0002] At present, for battery modules designed for square cells, thermal conductive glue is often sprayed on the bottom of the module before the module is placed in the battery box. The module is then installed on a liquid-cooled base plate, and heat is exchanged between the bottom of the cell and the liquid-cooled base plate to dissipate the heat generated by the cell during the charging and discharging process. However, due to the relatively small area of ​​the bottom of the cell, the heat transfer efficiency is low, and the cell height is high, the heat transfer path from the top of the cell to the bottom of the cell is long, resulting in a large temperature difference between the upper and lower surfaces of the cell. In addition, the process of spraying thermal conductive glue before installing the module has high requirements for equipment and poor consistency; and the thermal conductive glue is not easy to disassemble after solidification, which is not conducive to module maintenance.

[0003] In view of the above problems, the prior art provides a thermal safety management system, which includes a plurality of heat-conducting parts, and an installation area for accommodating and installing battery cells is formed between adjacent heat-conducting parts. The heat-conducting parts include a support portion and an abutment portion. The support portion abuts and thermally contacts with the entire package of heat-conducting mechanisms, and the abutment portion has a fitting end face and is used to fit and contact with the battery cells. The setting of the abutment portion can increase the effective thermal contact area between the heat-conducting parts and the battery cells, and accelerate the rate at which heat is transferred from the battery cells to the heat-conducting parts. The heat is then transferred to the entire package of heat-conducting mechanisms through the support portion for absorption, thereby achieving a heat dissipation effect on the battery cells. Moreover, the setting of the heat-conducting parts can facilitate the disassembly of the module and facilitate maintenance. However, when the battery cells expand and deform, the abutment portion will squeeze the expanded battery cells, so that the heat inside the battery cells cannot be dissipated outward in a timely and effective manner, resulting in overheating of the battery cells, and thus there is still a safety hazard of battery cell explosion or fire.

[0004] Based on the above, there is an urgent need for a battery module and a battery pack to solve the technical problems existing in the prior art. Summary of the invention

[0005] An object of the present invention is to provide a battery module that can ensure that the heat inside the battery cell that has expanded and deformed is dissipated outward in a timely and effective manner, thereby ensuring safety in use.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A battery module comprises: a plurality of battery cells; a first heat-conducting structure, wherein the first heat-conducting structure is sandwiched between adjacent battery cells; a second heat-conducting structure, wherein the second heat-conducting structure is arranged in cooperation with the first heat-conducting structure, and the first heat-conducting structure can move relative to the second heat-conducting structure; and an accommodating space, wherein the plurality of battery cells, the first heat-conducting structure and the second heat-conducting structure are arranged in cooperation within the accommodating space; wherein, when at least one of the battery cells expands along the normal direction of its main side surface, the first heat-conducting structure can move relative to the second heat-conducting structure to move from a relative first position state to a relative second position state.

[0008] Preferably, the second heat-conducting structure is attached to and in thermal contact with the end faces of the plurality of battery cells, a guide groove is provided on the second heat-conducting structure, the first heat-conducting structure is inserted into the guide groove, and can slide in the guide groove along the normal direction of the main side surface of the battery cell.

[0009] Preferably, a limiting structure is convexly provided on the inner side wall of the guide groove; the first heat-conducting structure is provided with a guide block, the guide block is inserted in the guide groove, the guide block can slide in the guide groove along the normal direction of the main side surface of the battery cell, and the guide block limiting clamp is arranged between the limiting structure and the bottom of the guide groove.

[0010] Preferably, the length extension direction of the guide groove is horizontally perpendicular to the normal direction of the main side surface of the battery cell, and both ends of the guide groove are penetrated by the second heat-conducting structure, and there is a movable margin gap between the guide block and the side wall of the guide groove so that the guide block can slide in the guide groove along the normal direction of the main side surface of the battery cell.

[0011] Preferably, the first heat-conducting structure comprises a fixedly connected heat-conducting clamping plate and a heat-conducting elastic pad, at least one of the heat-conducting elastic pads is sandwiched between the heat-conducting clamping plate and the battery cell, and the heat-conducting clamping plate is inserted into the guide groove and can slide in the guide groove along the normal direction of the main side surface of the battery cell, and the heat-conducting elastic pad can expand and contract and deform along the normal direction of the main side surface of the battery cell.

[0012] Preferably, along the normal direction of the main side surface of the battery cell, the second heat-conducting structure is fitted on the main side surface of the battery cell located at the end of the battery module, and is spaced apart from the first heat-conducting structure, and there is a movable margin gap between the first heat-conducting structure and the second heat-conducting structure.

[0013] Preferably, the first heat-conducting structure comprises a heat-conducting clamping plate, a heat-conducting elastic pad and a heat-conducting base plate, the heat-conducting clamping plate is arranged between adjacent battery cells, the heat-conducting elastic pad is fixedly connected to the heat-conducting clamping plate and clamped between the heat-conducting clamping plate and the battery cells, and the heat-conducting base plate is fixedly arranged at the end of the heat-conducting clamping plate so that the heat-conducting base plate can be thermally connected to the end surface of at least one of the adjacent battery cells.

[0014] Preferably, the second heat-conducting structure comprises a heat-conducting side plate and a heat-conducting support plate, the heat-conducting side plate is attached to the main side surface of the battery core and is arranged relative to the heat-conducting clamping plate at an interval, the heat-conducting support plate is fixedly connected to the end of the heat-conducting side plate, and there is the movable margin gap between the heat-conducting support plate and the heat-conducting bottom plate.

[0015] Preferably, the first heat-conducting structure is a T-shaped structure, and along the normal direction of the main side surface of the battery cell, the heat-conducting bottom plate is protrudingly provided on opposite sides of the heat-conducting clamping plate, so that the heat-conducting bottom plate can be thermally connected to two adjacent battery cells at the same time.

[0016] Preferably, the battery module comprises at least two of the first heat-conducting structures, and the movable margin gap is provided between two of the heat-conducting base plates in the two first heat-conducting structures.

[0017] Preferably, the battery module comprises a cable tie, the cable tie is ring-shaped, and the cable tie surrounds and forms the accommodating space;

[0018] Alternatively, the battery module comprises a shell, and the shell has the accommodating space.

[0019] Another object of the present invention is to provide a battery pack, which can improve the safety and reliability of the battery pack by arranging the above-mentioned battery module in the battery pack.

[0020] To achieve this object, the present invention adopts the following technical solutions:

[0021] A battery pack includes a battery case, a heat exchange structure and the above-mentioned battery module, wherein the heat exchange structure and the battery module are both arranged in the battery case, and the heat exchange structure is arranged at the bottom of the battery case, and the battery module is arranged and thermally contacted with the top of the heat exchange structure.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a battery module, in which a first heat-conducting structure is sandwiched between adjacent battery cells, and the first heat-conducting structure can move relative to a second heat-conducting structure. In this way, when the battery cell expands and deforms, the first heat-conducting structure can absorb the expansion and deformation force of the battery cell by moving relative to the second heat-conducting structure, thereby avoiding the first heat-conducting structure from squeezing the battery cell that has expanded and deformed, making it easier for the heat inside the battery cell that has expanded and deformed to dissipate outwards, avoiding accumulation in the battery cell, so that the battery module can always maintain good heat dissipation performance, prevent overheating, and ensure the safe use of the battery cell.

[0024] The present invention also provides a battery pack, and by arranging the above-mentioned battery module in the battery pack, the safety and reliability of the battery pack can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a battery module provided in Embodiment 1 of the present invention;

[0026] Figure 2 is an assembly front view of the first heat-conducting structure and the second heat-conducting structure provided in the first embodiment of the present invention in a first position state;

[0027] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0028] Figure 4 is a front view of the assembly of the first heat-conducting structure and the second heat-conducting structure provided in the first embodiment of the present invention in the second position state;

[0029] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0030] Figure 6 is a schematic structural diagram of a battery module provided in Embodiment 2 of the present invention;

[0031] Figure 7 is a front view of a battery module provided by Embodiment 2 of the present invention;

[0032] Figure 8 yes Figure 7 A partial enlarged view of point C in the middle;

[0033] Fig. 9 yes Figure 7 A partial enlarged view of point D in the middle.

[0034] In the figure:

[0035] a. Active clearance;

[0036] 1. Battery cell;

[0037] 2. first heat-conducting structure; 21. heat-conducting clamping plate; 211. guide block; 22. heat-conducting bottom plate;

[0038] 3. Second heat-conducting structure; 31. Guide groove; 311. Limiting structure; 32. Heat-conducting side plate; 33. Heat-conducting support plate;

[0039] 4. Cable tie. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] Embodiment 1

[0045] Combination Figure 1 to Figure 2This embodiment provides a battery module for a battery pack, which mainly includes a plurality of battery cells 1, a first heat-conducting structure 2, a second heat-conducting structure 3 and a containing space. The battery cells 1 are square battery cells, the first heat-conducting structure 2 is sandwiched between adjacent battery cells 1, the second heat-conducting structure 3 is arranged in cooperation with the first heat-conducting structure 2, and the first heat-conducting structure 2 can move relative to the second heat-conducting structure 3; the function of the containing space is to arrange the plurality of battery cells 1, the first heat-conducting structure 2 and the second heat-conducting structure 3 in cooperation in the containing space, so that the battery module is grouped.

[0046] Through the above settings, combined with Figures 2 to 5 , for example, when the battery cell 1 at the end is along the normal direction of its main side surface (i.e., along Figure 3 When the battery cell 1 is expanded and deformed in the direction indicated by the X-axis, the first heat-conducting structure 2 can move relative to the second heat-conducting structure 3 from the relatively first position state to the relatively second position state, so that the expansion deformation force of the battery cell 1 can be absorbed by the first heat-conducting structure 2, thereby avoiding the first heat-conducting structure 2 from squeezing the battery cell 1 that has expanded and deformed, making it easier for the heat inside the battery cell 1 that has expanded and deformed to dissipate outwards, avoiding accumulation in the battery cell 1, so that the battery module can always maintain good heat dissipation performance, prevent overheating, and ensure the safe use of the battery cell 1.

[0047] In this embodiment, the first heat-conducting structure 2 specifically includes a heat-conducting clamping plate 21 and a heat-conducting elastic pad (not shown in the figure) that are fixedly connected, wherein a heat-conducting elastic pad is attached to each of the two opposite sides of the heat-conducting clamping plate 21, so that a heat-conducting elastic pad is sandwiched between the heat-conducting clamping plate 21 and two adjacent battery cells 1, and the heat-conducting clamping plate 21 is movably arranged on the second heat-conducting structure 3. In the above arrangement, the heat-conducting clamping plate 21 is sandwiched between the two heat-conducting elastic pads, and because the heat-conducting elastic pad is elastic, when the battery cell 1 expands and deforms along the X-axis direction, the heat-conducting elastic pads on both sides of the heat-conducting clamping plate 21 can be compressed, so that the expansion force absorbed by the heat-conducting elastic pad can be transmitted to the heat-conducting clamping plate 21, and because the heat-conducting clamping plate 21 is movably arranged on the second heat-conducting structure 3, the heat-conducting clamping plate 21 can move relative to the second heat-conducting structure 3 along the X-axis direction on the second heat-conducting structure 3 as the battery cell 1 expands. In this way, compared with the method of fixing the heat-conducting clamp 21 to the second heat-conducting structure 3, the heat-conducting clamp 21 provided in this embodiment can effectively absorb the expansion deformation force generated by the battery cell 1, thereby achieving the good effect of ensuring that the battery module has good heat dissipation performance, thereby improving the safety of the battery cell 1 and the entire battery module.

[0048] It should be noted that the present embodiment does not limit the type of the thermally conductive elastic pad, and the thermally conductive elastic pad may be made of other elastic materials with good thermal conductivity, such as thermally conductive silicone, thermally conductive foam, etc.

[0049] In this embodiment, the second heat-conducting structure 3 is attached to and thermally contacts the bottom end surfaces of the plurality of battery cells 1, so that the second heat-conducting structure 3 can be thermally connected to the first heat-conducting structure 2 and the battery cells 1 at the same time, thereby accelerating the speed at which the first heat-conducting structure 2 and the battery cells 1 dissipate heat outward, thereby improving the cooling efficiency of the battery cells 1. Figure 3 The top surface of the second heat-conducting structure 3 is recessed inward to form a guide groove 31, and the heat-conducting clamping plate 21 in the first heat-conducting structure 2 is inserted into the guide groove 31, so that when the heat-conducting clamping plate 21 slides in the guide groove 31 along the X-axis, it can be prevented from tilting or flipping under the limiting effect of the guide groove 31, thereby ensuring the stability and reliability of the heat-conducting clamping plate 21.

[0050] Furthermore, a limiting structure 311 is provided on the inner side wall of the guide groove 31, and a guide block 211 is provided at the bottom of the heat-conducting clamp 21. The guide block 211 is inserted in the guide groove 31, and the guide block 211 can slide in the guide groove 31 along the X-axis direction, and the guide block 211 limiting clamp is provided between the limiting structure 311 and the groove bottom of the guide groove 31, so that the guide block 211 and the heat-conducting clamp 21 are limited to move in the vertical direction through the cooperation of the limiting structure 311 and the guide groove 31, thereby preventing the heat-conducting clamp 21 from escaping from the guide groove 31, thereby ensuring good contact between the heat-conducting clamp 21 and the second heat-conducting structure 3, and also enabling the heat-conducting elastic pad fixedly connected to the heat-conducting clamp 21 to maintain a larger thermal contact area with the battery cell 1, thereby ensuring a good heat-conducting effect.

[0051] Furthermore, in this embodiment, the length extension direction of the guide groove 31 is horizontally perpendicular to the X-axis, and the two ends of the guide groove 31 are arranged through the second heat-conducting structure 3 to form a guide groove 31 with openings at both ends on the second heat-conducting structure 3. In this way, the guide block 211 can be inserted into the guide groove 31 in a direction horizontally perpendicular to the X-axis, or pulled out from the guide groove 31, so as to be conveniently loaded and unloaded on the second heat-conducting structure 3 without affecting the installation position of the battery cell 1 on the second heat-conducting structure 3, thereby saving operation time. In addition, there is also an active margin gap a between the guide block 211 and the side wall of the guide groove 31 to achieve the purpose of the guide block 211 sliding in the guide groove 31 along the X-axis direction. It should be noted that the size of the active margin gap a is not limited in this embodiment. For example, in this embodiment, the active margin gap a is greater than or equal to 0.3 mm and less than or equal to 1 mm.

[0052] It should be noted that, in the present embodiment, the second heat-conducting structure 3 is a liquid cooling plate fixedly mounted on the bottom of the battery cell 1. Of course, in other embodiments, the second heat-conducting structure 3 may also be a bottom plate having a heat exchange channel on the battery box in the battery pack, and the present invention is not limited to this.

[0053] refer to Figure 1 Optionally, in this embodiment, the battery module further includes a cable tie 4, which is annular and surrounds the above-mentioned accommodation space, so that the above-mentioned multiple battery cells 1 can be bundled into groups and shaped by the cable tie 4. It can be understood that the number of cable ties 4 can be one or more, and the specific number can be adjusted according to actual needs, constraints, and factors such as the size and shape of the battery cell 1, which is not limited in this embodiment. Of course, it can be understood that for a battery module in the form of CTP (cell to pack), the battery module also includes a shell with an accommodation space, so that the battery cell 1, the first heat-conducting structure 2 and the second heat-conducting structure 3 are directly assembled into a group in the shell, so as to achieve the purpose of forming the battery module, while omitting the arrangement of module components such as the cable tie 4 and the module end plate. Therefore, the present invention does not limit the formation method of the accommodation space.

[0054] Another object of the present invention is to provide a battery pack, which includes a battery case, a heat exchange structure and the above-mentioned battery module, wherein the heat exchange structure and the battery module are both arranged in the battery case, the heat exchange structure is arranged at the bottom of the battery case, and the battery module is arranged and thermally contacted with the top of the heat exchange structure. By arranging the above-mentioned battery module in the battery pack, the safety and reliability of the battery pack can be effectively improved.

[0055] Embodiment 2

[0056] refer to Figures 6 to 9 The difference between this embodiment and the first embodiment is that, along the X-axis direction, the second heat-conducting structure 3 is fitted on the main side surface of the battery core 1 located at the end, and is spaced apart from the first heat-conducting structure 2, so as to form an accommodation space for accommodating the battery core 1 between the second heat-conducting structure 3 and the first heat-conducting structure 2, and there is a movable margin gap a between the first heat-conducting structure 2 and the second heat-conducting structure 3, so that when the battery core 1 expands and deforms, the first heat-conducting structure 2 can move relative to the second heat-conducting structure 3 through the movable margin gap a to move from a relative first position state to a relative second position state.

[0057] Specifically, in this embodiment, reference Figure 8The first heat-conducting structure 2 includes a heat-conducting clamping plate 21, a heat-conducting elastic pad and a heat-conducting bottom plate 22. The heat-conducting clamping plate 21 is arranged between two adjacent battery cells 1. The heat-conducting elastic pad is fixedly connected to the side of the heat-conducting clamping plate 21 and clamped between the main side of the heat-conducting clamping plate 21 and the battery cell 1. The heat-conducting bottom plate 22 is fixedly arranged at the end of the heat-conducting clamping plate 21, so that the heat-conducting clamping plate 21 provided in this embodiment can be heat-conductingly connected to the bottom end surface of at least one of the adjacent battery cells 1, so that the heat-conducting bottom plate 22 can be heat-conductingly connected to the heat-conducting clamping plate 21 and the battery cell 1 at the same time, and can transfer heat to the heat exchange structure located at the bottom of the battery box in time, thereby helping to increase the heat-conducting area between the first heat-conducting structure 2 and the battery cell 1, and improving the heat dissipation effect of the first heat-conducting structure 2.

[0058] In this embodiment, the use principle of the thermally conductive elastic pad is the same as that of the first embodiment, and both use the elastic characteristics of the thermally conductive elastic pad to transfer the expansion force to the thermally conductive clamping plate 21 when the battery cell 1 expands and deforms, so that the thermally conductive clamping plate 21 can move relative to the second thermally conductive structure 3 along the X-axis direction, thereby ensuring that the battery cell 1 is not squeezed after expansion, so that the battery module has a higher heat dissipation performance. Therefore, this embodiment will not be elaborated on in detail again.

[0059] Preferably, continue to refer to Figure 8 , the first heat-conducting structure 2 is a T-shaped structure, that is, along the X-axis direction, the heat-conducting bottom plate 22 is protrudingly provided on the opposite sides of the heat-conducting clamp 21, so that the heat-conducting bottom plate 22 can be in thermal contact with the bottom end surfaces of the two adjacent battery cells 1 at the same time. By optimizing the design of the first heat-conducting structure 2, the two adjacent battery cells 1 can increase the heat conduction performance with the outside world through the heat-conducting bottom plate 22, which is also helpful to achieve temperature uniformity between adjacent battery cells 1 and reduce the performance difference caused by temperature difference, thereby ensuring the stability and safety of the battery module. In addition, compared with the first heat-conducting structure 2 with an L-shaped cross-section, the first heat-conducting structure 2 with a T-shaped structure has higher bending resistance, and thus has higher bearing capacity and stability, so that the pressure effect of the two adjacent batteries on the first heat-conducting structure 2 is more uniform and balanced, which can prevent the risk of a battery cell 1 in the battery module being dented and causing deformation of the battery module.

[0060] It should be noted that, in this embodiment, a plurality of battery cells 1 are arranged between the two battery cells 1 at the end, so that the battery module includes at least three battery cells 1 arranged in parallel. Taking three battery cells 1 as an example, two first heat-conducting structures 2 are sandwiched between the three battery cells 1, and the above-mentioned movable margin gap a is also arranged between the two first heat-conducting structures 2, that is, the movable margin gap a is formed between two adjacent heat-conducting bottom plates 22, so that when the battery cell 1 located in the middle position expands and deforms, the movable margin gap a between the two adjacent first heat-conducting structures 2 can effectively absorb and buffer such expansion, thereby avoiding direct contact and friction between adjacent first heat-conducting structures 2, and preventing the first heat-conducting structures 2 from failing or being damaged.

[0061] It should be noted that the sizes of the movable margin gap a between two adjacent first heat-conducting structures 2 and the movable margin gap a between the first heat-conducting structure 2 and the second heat-conducting structure 3 can be equal or unequal. The equality can be determined based on the heat load distribution, cooling requirements, etc., and the present invention is not limited to this.

[0062] Specifically, in this embodiment, reference Fig. 9 The second heat-conducting structure 3 includes a heat-conducting side plate 32 and a heat-conducting support plate 33, wherein the heat-conducting side plate 32 is attached to the main side surface of the battery cell 1 and is arranged relative to the heat-conducting clamping plate 21 to cooperate with the heat-conducting clamping plate 21 to cover and wrap the two main side surfaces of the battery cell 1, and the heat-conducting support plate 33 is fixedly connected to the bottom surface of the heat-conducting side plate 32, so that the heat-conducting support plate 33 and the heat-conducting bottom plate 22 can be thermally connected to the bottom end surface of the battery cell 1 at the end at the same time, and there is the above-mentioned movable margin gap a between the heat-conducting support plate 33 and the heat-conducting bottom plate 22. In this way, through the design of the first heat-conducting structure 2 and the second heat-conducting structure 3, the two main side surfaces and the bottom end surface of the battery cell 1 located at the end, and the two main side surfaces and the bottom end surface of the battery cell 1 located in the middle position can achieve efficient thermal contact between the battery cell 1 and the heat transfer structure by thermally contacting two of the heat-conducting clamping plate 21, the heat-conducting bottom plate 22, the heat-conducting side plate 32 and the heat-conducting support plate 33, thereby helping to further improve the thermal management efficiency of the overall battery module.

[0063] Preferably, in this embodiment, the second heat-conducting structure 3 is an L-shaped structure, so as to achieve the effect of heat-conducting contact with the battery core 1 located at the end while saving manufacturing cost.

[0064] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery module, characterized in that: include: A plurality of battery cells (1); A first heat-conducting structure (2), wherein the first heat-conducting structure (2) is sandwiched between adjacent battery cells (1); a second heat-conducting structure (3), wherein the second heat-conducting structure (3) is arranged in cooperation with the first heat-conducting structure (2), and the first heat-conducting structure (2) is movable relative to the second heat-conducting structure (3); An accommodating space, wherein the plurality of battery cells (1), the first heat-conducting structure (2) and the second heat-conducting structure (3) are cooperatively arranged in the accommodating space; When at least one of the battery cells (1) expands along the normal direction of its main side surface, the first heat-conducting structure (2) can move relative to the second heat-conducting structure (3) from a relative first position state to a relative second position state.

2. The battery module according to claim 1, characterized in that: The second heat-conducting structure (3) is attached to and in thermal contact with the end faces of the plurality of battery cells (1); a guide groove (31) is provided on the second heat-conducting structure (3); the first heat-conducting structure (2) is inserted into the guide groove (31) and can slide in the guide groove (31) along the normal direction of the main side surface of the battery cell (1).

3. The battery module according to claim 2, characterized in that: The inner side wall of the guide groove (31) is convexly provided with a limiting structure (311); the first heat-conducting structure (2) is provided with a guide block (211), the guide block (211) is inserted into the guide groove (31), the guide block (211) can slide in the guide groove (31) along the normal direction of the main side surface of the battery cell (1), and the guide block (211) limiting clamp is arranged between the limiting structure (311) and the groove bottom of the guide groove (31).

4. The battery module according to claim 3, characterized in that: The length extension direction of the guide groove (31) is horizontally perpendicular to the normal direction of the main side surface of the battery cell (1), and both ends of the guide groove (31) are arranged to penetrate the second heat-conducting structure (3), and there is a movable margin gap (a) between the guide block (211) and the side wall of the guide groove (31), so that the guide block (211) can slide in the guide groove (31) along the normal direction of the main side surface of the battery cell (1).

5. The battery module according to claim 2, characterized in that: The first heat-conducting structure (2) comprises a fixedly connected heat-conducting clamping plate (21) and a heat-conducting elastic pad, at least one of the heat-conducting elastic pads is sandwiched between the heat-conducting clamping plate (21) and the battery cell (1), and the heat-conducting clamping plate (21) is inserted into the guide groove (31) and can slide in the guide groove (31) along the normal direction of the main side surface of the battery cell (1), and the heat-conducting elastic pad can be stretched and deformed along the normal direction of the main side surface of the battery cell (1).

6. The battery module according to claim 1, characterized in that: Along the normal direction of the main side surface of the battery cell (1), the second heat-conducting structure (3) is arranged on the main side surface of the battery cell (1) at the end of the battery module, and is spaced apart from the first heat-conducting structure (2), and there is a movable margin gap (a) between the first heat-conducting structure (2) and the second heat-conducting structure (3).

7. The battery module according to claim 6, characterized in that: The first heat-conducting structure (2) comprises a heat-conducting clamping plate (21), a heat-conducting elastic pad and a heat-conducting bottom plate (22); the heat-conducting clamping plate (21) is arranged between adjacent battery cells (1); the heat-conducting elastic pad is fixedly connected to the heat-conducting clamping plate (21) and clamped between the heat-conducting clamping plate (21) and the battery cell (1); the heat-conducting bottom plate (22) is fixedly arranged at the end of the heat-conducting clamping plate (21) so that the heat-conducting bottom plate (22) can be heat-conductingly connected to the end surface of at least one of the adjacent battery cells (1).

8. The battery module according to claim 7, characterized in that: The second heat-conducting structure (3) comprises a heat-conducting side plate (32) and a heat-conducting support plate (33); the heat-conducting side plate (32) is attached to the main side surface of the battery core (1) and is arranged relative to the heat-conducting clamping plate (21) at a distance; the heat-conducting support plate (33) is fixedly connected to the end of the heat-conducting side plate (32), and the movable margin gap (a) is provided between the heat-conducting support plate (33) and the heat-conducting bottom plate (22).

9. The battery module according to claim 7, characterized in that: The first heat-conducting structure (2) is a T-shaped structure, and along the normal direction of the main side surface of the battery core (1), the heat-conducting bottom plate (22) is protrudingly provided on opposite sides of the heat-conducting clamping plate (21), so that the heat-conducting bottom plate (22) can be heat-conductingly connected to two adjacent battery cores (1) at the same time.

10. The battery module according to claim 7, characterized in that: The battery module comprises at least two of the first heat-conducting structures (2), and the movable margin gap (a) is provided between the two heat-conducting base plates (22) in the two first heat-conducting structures (2).

11. The battery module according to claim 1, characterized in that: The battery module comprises a cable tie (4), the cable tie (4) is ring-shaped, and the cable tie (4) surrounds and forms the accommodating space; Alternatively, the battery module comprises a shell, and the shell has the accommodating space.

12. A battery pack, characterized in that: It comprises a battery case, a heat exchange structure and a battery module according to any one of claims 1 to 11, wherein the heat exchange structure and the battery module are both arranged in the battery case, and the battery module is thermally connected to the heat exchange structure.

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