Battery module

Abstract

The utility model discloses a battery module. The battery module comprises at least three battery cells, a heating piece and a heat conduction assembly which are arranged in sequence, the heating element is arranged on at least one side of the at least three battery cells along the preset direction and is used for heating the at least three battery cells. The heat conduction assembly comprises heat conduction bosses which are in one-to-one correspondence with the at least three battery cells. The heat conduction bosses are arranged between the heating pieces and the corresponding battery cells so as to conduct heat between the heating pieces and the corresponding battery cells. And in the direction from the battery cell at the middle position to the battery cells at the edge positions, the sectional areas of the at least three corresponding heat conduction bosses on the same cross section plane perpendicular to the preset direction are gradually increased. Through the mode, the temperature difference between different battery cells in the battery cell heating process can be reduced, and the balance between the different battery cells when the battery module works is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a battery module. Background Art

[0002] With the development of science and technology, the types and application scenarios of electrical equipment are becoming more and more diverse. Batteries can power electrical equipment to improve the endurance of electrical equipment. For example, a battery module is a component of an electrical equipment to power the electrical equipment. For another example, a portable battery module can be used in an energy storage device to use the energy storage device to power external electrical equipment, or to charge the energy storage device for energy storage when the energy storage device itself is insufficient.

[0003] Battery modules sometimes need to work in low-temperature scenarios (e.g. -20℃~0℃). Too low a temperature will affect the charging rate and life of the battery cells, and is not conducive to the normal working state of the battery cells. Therefore, when the battery cells are used in low-temperature scenarios, they need to be heated. However, the heating method for the battery cells in the prior art has poor uniformity, which makes the battery cells prone to uneven heating. Utility Model Content

[0004] The main technical problem solved by the present application is to provide a battery module that can reduce the temperature difference between different battery cells during the battery cell heating process and improve the balance between different battery cells when the battery module is working.

[0005] In order to solve the above technical problems, the technical solution adopted in the present application is: to provide a battery module, the battery module includes at least three battery cells, a heating element and a heat-conducting component arranged in sequence. The heating element is arranged on at least one side of the at least three battery cells along a preset direction, and is used to heat the at least three battery cells. The heat-conducting component includes heat-conducting bosses corresponding to the at least three battery cells one by one. The heat-conducting bosses are arranged between the heating element and the corresponding battery cells to conduct heat between the heating element and the corresponding battery cells. From the battery cell in the middle position to the battery cell in the edge position, the cross-sectional area of ​​the corresponding at least three heat-conducting bosses on the same cross-sectional plane perpendicular to the preset direction gradually increases.

[0006] The beneficial effects of the present application are as follows: different from the prior art, a heating element is arranged on at least one side of at least three battery cells along a preset direction to heat the at least three battery cells, the heat-conducting assembly includes heat-conducting bosses corresponding to the at least three battery cells respectively, the heat-conducting bosses are arranged between the heating element and the corresponding battery cells to conduct heat between the heating element and the corresponding battery cells, and the cross-sectional areas of the at least three corresponding heat-conducting bosses on the same cross-sectional plane perpendicular to the preset direction gradually increase from the battery cell in the middle position to the battery cell in the edge position, and the battery cell is heated by the heating element when used in a low-temperature scene, which is beneficial to the preservation of the battery cell. Maintaining a normal working state, the heat generated by the heating element is transferred to the battery cell through the heat-conducting component, which can enhance the reliability of the battery cell heating process and reduce the risk of local overtemperature of the battery cell caused by local overtemperature of the heating element. The cross-sectional area of ​​the heat-conducting boss corresponding to the battery cell in the middle position is smaller, and the heat transfer efficiency is lower, while the cross-sectional area of ​​the heat-conducting boss corresponding to the battery cell at the edge position is larger, and the heat transfer efficiency is higher. This is conducive to reducing the temperature difference between different battery cells during the battery cell heating process, improving the balance between different battery cells when the battery module is working, and at the same time improving the heating effect of the heating element and the working stability of the battery module, reducing the occurrence of risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the top view of the battery module embodiment of the present application after some parts are hidden;

[0008] Figure 2 This is a schematic diagram of the side view structure of the battery module embodiment of the present application after some parts are hidden;

[0009] Figure 3 This is a schematic side view of the structure of a battery module embodiment of the present application;

[0010] Figure 4 This is a schematic diagram of the limiting structure of the side shell and the heat-conducting substrate from a side view of the battery module embodiment of the present application. DETAILED DESCRIPTION

[0011] 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. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0012] After long-term research, the inventors found that battery modules can supply power to electrical equipment or energy storage equipment to improve the endurance of electrical equipment or energy storage equipment. Taking energy storage equipment as an example, battery modules sometimes need to work in low temperature scenes (for example, -20°C ~ 0°C). Too low temperature will affect the charging rate and life of the battery cells, which is not conducive to the battery cells maintaining a normal working state. Therefore, when the battery cells are used in low temperature scenes, the battery cells need to be heated. However, the heating method for the battery cells in the prior art has poor uniformity, which makes the battery cells prone to uneven heating. In order to solve this technical problem, the present application provides the following embodiments.

[0013] like Figure 1 and Figure 2 As shown, the battery module described in the embodiment of the battery module of the present application includes at least three battery cells 100, a heating element 200 and a heat-conducting component 300 arranged in sequence. The heating element 200 is arranged on at least one side of the at least three battery cells 100 along the preset direction D1, and is used to heat the at least three battery cells 100. The heat-conducting component 300 includes heat-conducting bosses 310 corresponding to the at least three battery cells 100. The heat-conducting bosses 310 are arranged between the heating element 200 and the corresponding battery cells 100 to conduct heat between the heating element 200 and the corresponding battery cells 100. From the battery cell 100 in the middle position to the battery cell 100 in the edge position in the direction D2, the cross-sectional area of ​​the corresponding at least three heat-conducting bosses 310 on the same cross-sectional plane perpendicular to the preset direction D1 gradually increases. Among them, the preset direction D1 can be the same as the length direction of the above-mentioned battery cell 100.

[0014] Low temperature scenarios (e.g. -20°C to 0°C) are not conducive to the normal operation of the battery cell 100. Too low a temperature will affect the charging rate and life of the battery cell 100. When the battery cell 100 is used in a low temperature scenario, the heating element 200 is required to heat the battery cell 100, which is beneficial for the battery cell 100 to maintain a normal working state. For example, before charging the battery cell 100, the heating element 200 can be used to heat the battery cell 100 so that the temperature of the battery cell 100 reaches above 0°C, so that the battery cell 100 can perform normal charging functions.

[0015] By setting a heat conductive component 300 between the heating element 200 and the battery cell 100, the heat generated by the heating element 200 is transferred to the battery cell 100 via the heat conductive component 300, which can enhance the reliability of the heating process of the battery cell 100 and reduce the risk of excessive local temperature of the battery cell 100 due to excessive local temperature of the heating element 200.

[0016] At least three battery cells 100 can be arranged in the battery module 1, which is beneficial to improve the energy storage capacity of the battery module 1 and improve the controllability of the energy of the battery module 1. For example, there are 8 battery cells 100, and all the battery cells 100 are arranged in sequence. When the heating element 200 heats all the battery cells 100, the battery cells 100 in the middle position heat up faster, and the battery cells 100 at the edge position heat up slower. The temperature difference between the battery cells 100 will cause uneven lifespans between the battery cells 100, accelerating the decay of the lifespan of the whole machine. In addition, since it is necessary to wait for the battery cell 100 with the lowest temperature to reach the target temperature, the heating time will also be increased, wasting electric energy. In addition, when the battery cell 100 with the lowest temperature reaches the target temperature, the local temperature inside the battery module 1 may exceed the upper temperature limit (for example, 60°C), resulting in the risk of the battery cell 100 being burned.

[0017] Correspondingly, all the heat-conducting bosses 310 can be arranged in sequence along the arrangement direction of all the battery cells 100, and there is a cross-sectional plane that passes through all the heat-conducting bosses 310 at the same time in the plane perpendicular to the preset direction D1. The heat generated by the heating element 200 can be transferred to different battery cells 100 through different heat-conducting bosses 310. The heat-conducting bosses 310 with larger cross-sectional areas conduct more heat and have higher heat transfer efficiency, while the heat-conducting bosses 310 with smaller cross-sectional areas conduct less heat and have lower heat transfer efficiency. In the direction D2 from the battery cell 100 in the middle position to the battery cell 100 in the edge position, by setting all the heat-conducting bosses 310 to gradually increase the cross-sectional area on the same cross-sectional plane perpendicular to the preset direction D1, the cross-sectional area of ​​the heat-conducting bosses 310 corresponding to the battery cell 100 in the middle position is smaller and the heat transfer efficiency is lower, and the cross-sectional area of ​​the heat-conducting bosses 310 corresponding to the battery cell 100 in the edge position is larger and the heat transfer efficiency is higher. In this way, it is beneficial to reduce the temperature difference between different battery cells 100 during the heating process of the battery cell 100, improve the balance between different battery cells 100 when the battery cell 100 is working, improve the heating effect of the heating element 200 and the working stability of the battery cell 100, and reduce the occurrence of risks. Wherein, the direction D2 can be perpendicular to the preset direction D1, for example, the direction D2 can be a direction parallel to the end surface formed by the same side end of all battery cells 100.

[0018] Optionally, the cross section of the heat conducting boss 310 is square or circular, and the cross-sectional areas of the heat conducting bosses 310 at different distances from the middle position may be different by setting the side lengths of the square or the diameters of the circle to be different.

[0019] In some embodiments, the thicknesses of all the heat-conducting bosses 310 may be set to be different, so that the heat transfer efficiencies of the heat-conducting bosses 310 at different distances from the middle position are different.

[0020] Optionally, the number of the battery cells 100 arranged in sequence is 3, 4, 5, 6, 7, 8, 9 or 10. Correspondingly, the number of the thermal conductive bosses 310 is 3, 4, 5, 6, 7, 8, 9 or 10.

[0021] In some embodiments, the number of the battery cells 100 is the same as the number of the thermal conductive bosses 310 , or the number of the thermal conductive bosses 310 is twice the number of the battery cells 100 .

[0022] Optionally, the battery cell 100 is the smallest energy storage unit of the battery module 1. For example, the battery cell 100 may be a square-shell battery cell, a soft-pack battery cell, a cylindrical battery cell, or the like.

[0023] Optionally, the battery module 1 is a battery pack, which may include a plurality of battery cells 100, a battery management system (BMS) and a thermal management system, and the BMS and the thermal management system are used to jointly control or manage the plurality of battery cells 100. The battery pack may include an energy storage battery pack, such as a portable energy storage battery pack, a balcony photovoltaic energy storage battery pack, a household energy storage battery pack, an industrial and commercial energy storage battery pack, a container energy storage battery pack, etc.

[0024] Optionally, the heating element 200 includes a heating film, which includes two layers of insulating material and a conductive material between the two layers of insulating material. The conductive material can be a metal conductive material, such as copper, nickel, etc., or a conductive inorganic material, such as graphite, conductive SiC, conductive SiO2, conductive ink, carbon fiber, etc. The working principle of the heating film is to apply voltage to the conductive material so that the conductive material generates current, thereby converting electrical energy into thermal energy. The heating film can be attached to the thermal conductive component 300 to heat the thermal conductive component 300. The heating film may include a PET heating film, a PI heating film, a silicone heating sheet, etc.

[0025] The heating element 200 is arranged on the same side of at least three battery cells 100 along the preset direction D1, and is used to heat the at least three battery cells 100. The heat-conducting component 300 includes at least three heat-conducting bosses 310 corresponding to the at least three battery cells 100. The heat-conducting bosses 310 are arranged between the heating element 200 and the corresponding battery cells 100 to conduct heat between the heating element 200 and the corresponding battery cells 100. In the direction D2 from the battery cell 100 in the middle position to the battery cell 100 in the edge position, the cross-sectional area of ​​all the heat-conducting bosses 310 on the same cross-sectional plane perpendicular to the preset direction D1 gradually increases. When the battery cell 100 is used in a low-temperature scene, it is heated by the heating element 200, which is conducive to maintaining the normal working state of the battery cell 100. In this state, the heat generated by the heating element 200 is transferred to the battery cell 100 through the heat-conducting component 300, which can enhance the reliability of the heating process of the battery cell 100 and reduce the risk of local overtemperature of the battery cell 100 caused by local overtemperature of the heating element 200. The cross-sectional area of ​​the heat-conducting boss 310 corresponding to the battery cell 100 in the middle position is smaller and the heat transfer efficiency is lower. The cross-sectional area of ​​the heat-conducting boss 310 corresponding to the battery cell 100 at the edge position is larger and the heat transfer efficiency is higher. This is beneficial to reducing the temperature difference between different battery cells 100 during the heating process of the battery cell 100, improving the balance between different battery cells 100 when the battery module 1 is working, and at the same time improving the heating effect of the heating element 200 and the working stability of the battery module 1, reducing the occurrence of risks.

[0026] Alternatively, if Figure 2 and Figure 3 As shown, the cross-sectional areas of the same heat-conducting boss 310 in different cross-sectional planes perpendicular to the preset direction D1 are the same.

[0027] Specifically, the heat-conducting boss 310 extends along the extension direction, the areas of both ends of the heat-conducting boss 310 along the extension direction are the same, and the cross-sectional plane of the heat-conducting boss 310 perpendicular to the preset direction D1 is the same as the areas of both ends of the heat-conducting boss 310. Further, the shape of the heat-conducting boss 310 can be a column, such as a cylinder. The shape of the heat-conducting boss 310 can also be a cube.

[0028] Alternatively, if Figure 3 As shown, the heat-conducting boss 310 is provided with a hollow groove 311 penetrating the heat-conducting boss 310 along a preset direction D1.

[0029] By providing the hollow groove 311, the heating range of the thermal conductive boss 310 on the corresponding battery cell 100 can be increased while the cross-sectional plane area of ​​the thermal conductive boss 310 perpendicular to the preset direction D1 remains unchanged, which is beneficial for the thermal conductive boss 310 to uniformly heat the corresponding battery cell 100 and reduce the internal temperature difference of a single battery cell 100.

[0030] Alternatively, if Figure 1 and Figure 2As shown, the heat-conducting assembly 300 also includes a heat-conducting substrate 320, all the heat-conducting bosses 310 are respectively fixed on the same side of the heat-conducting substrate 320, and the heating element 200 is attached to the side of the heat-conducting substrate 320 that is away from the heat-conducting bosses 310. The heat-conducting substrate 320 is used to conduct heat between the heating element 200 and all the heat-conducting bosses 310.

[0031] The heat generated by the heating element 200 can be transferred to different heat-conducting bosses 310 through the heat-conducting substrate 320, and then transferred to different battery cells 100 by different heat-conducting bosses 310. The heat-conducting substrate 320 can enhance the reliability of the heating process of the battery cell 100 and reduce the risk of excessive local temperature of the battery cell 100 due to excessive local temperature of the heating element 200. The heat-conducting substrate 320 can connect all the heat-conducting bosses 310, and the heat-conducting substrate 320 is provided to facilitate the assembly of the heat-conducting bosses 310.

[0032] Furthermore, the heat-conducting substrate 320 and all the heat-conducting bosses 310 are integrally formed and connected. For example, the heat-conducting substrate 320 and all the heat-conducting bosses 310 are stamped from aluminum.

[0033] Alternatively, if Figure 1 and Figure 2 As shown, the battery cell 100 has a side surface 110 and a bottom surface 120 connected to each other. The battery module 1 also includes a housing 400, and the housing 400 includes a side shell 410 and a bottom shell 420. The side shell 410 is arranged opposite to the side surface 110 of the battery cell 100, and the bottom shell 420 is arranged opposite to the bottom surface 120 of the battery cell 100. The thermally conductive substrate 320 is between the side shell 410 and the side surface 110 of the battery cell 100. The thermally conductive assembly 300 also includes a thermally conductive bottom plate 330, which is connected to the thermally conductive substrate 320 and supported between the bottom surface 120 of the battery cell 100 and the bottom shell 420.

[0034] The heat-conducting bottom plate 330 may extend from the heat-conducting substrate 320 to between the bottom surface 120 of the battery cell 100 and the bottom shell 420. The battery cell 100 may press the heat-conducting substrate 320 onto the bottom shell 420. By providing the heat-conducting substrate 320, it is convenient to assemble and fix the heat-conducting component 300 and the battery cell 100. The heat-conducting substrate 320 may also play a role in heat conduction. By providing the heat-conducting substrate 320, the contact area between the heat-conducting component 300 and the battery cell 100 may be increased, thereby improving the heating efficiency.

[0035] Furthermore, there are at least three thermally conductive bottom plates 330 , and all the thermally conductive bottom plates 330 are disposed corresponding to all the battery cells 100 to support each battery cell 100 .

[0036] Optionally, in a direction D2 from the battery cell 100 at the middle position to the battery cell 100 at the edge position, the contact area between the thermally conductive bottom plate 330 and the battery cell 100 gradually increases to reduce the temperature difference between different battery cells 100 .

[0037] Optionally, the heat-conducting substrate 320 , the heat-conducting bottom plate 330 and all the heat-conducting bosses 310 are integrally formed and connected. For example, the heat-conducting substrate 320 , the heat-conducting bottom plate 330 and all the heat-conducting bosses 310 are formed by stamping and bending of aluminum material.

[0038] Alternatively, if Figure 1 and Figure 2 As shown, the battery module 1 further includes a housing 400, and the heat conductive substrate 320 is located between the housing 400 and the battery cell 100 and is limitedly connected to the housing 400. An accommodation space 401 is formed between the heat conductive substrate 320 and the housing 400, and the heating element 200 is located in the accommodation space 401.

[0039] When assembling the battery module 1, the heating element 200 can be first fixed to the heat conductive substrate 320, and then the heat conductive substrate 320 and the housing 400 are assembled to form the accommodation space 401. This arrangement facilitates the support and protection of the heating element 200, which is conducive to the stable operation of the heating element 200.

[0040] Alternatively, if Figure 2 and Figure 4 As shown, the heat-conducting substrate 320 is provided with a first clamping portion 321 , and the housing 400 is provided with a second clamping portion 402 . The first clamping portion 321 is clamped with the second clamping portion 402 , so that the heat-conducting substrate 320 and the housing 400 are limitedly connected.

[0041] Such arrangement facilitates the assembly and connection between the heat-conducting substrate 320 and the housing 400 .

[0042] Alternatively, if Figure 2 and Figure 4 As shown, the battery module 1 is provided with a snap-in assembly 600, and the heat-conducting substrate 320 and the housing 400 are connected via the snap-in assembly 600. Further, the snap-in assembly 600 includes the first snap-in portion 321 and the second snap-in portion 402 mentioned above.

[0043] Alternatively, if Figure 2 and Figure 4As shown, the battery cell 100 has a side surface 110 and a bottom surface 120 connected to each other. The housing 400 includes a side housing 410 and a bottom housing 420, the side housing 410 is arranged opposite to the side surface 110 of the battery cell 100, and the bottom housing 420 is arranged opposite to the bottom surface 120 of the battery cell 100. The thermal conductive substrate 320 is located between the side housing 410 and the side surface 110 of the battery cell 100. The first clamping portion 321 includes a protrusion 322 protruding toward the bottom housing 420, the second clamping portion 402 is arranged on the side housing 410, and a clamping groove 403 is provided on the side of the second clamping portion 402 facing away from the bottom housing 420, and the protrusion 322 is inserted into the clamping groove 403, so that the first clamping portion 321 is clamped with the second clamping portion 402.

[0044] When assembling the heat conducting assembly 300, the protrusion 322 can be controlled to align with the opening of the clamping groove 403 and move toward the clamping groove 403 until the protrusion 322 is inserted into the clamping groove 403. This arrangement facilitates the assembly, connection and disassembly of the heat conducting substrate 320 and the housing 400.

[0045] Furthermore, there are two heat-conducting substrates 320 , which are arranged opposite to each other and respectively connected to the side shell 410 in a limiting manner, and the battery cell 100 is arranged to be limited between the two heat-conducting substrates 320 .

[0046] Alternatively, if Figure 1 and Figure 2 As shown, a heat conducting member 500 is disposed between the heat conducting boss 310 and the corresponding battery core 100. The heat conducting member 500 is used to connect the heat conducting boss 310 and the corresponding battery core 100.

[0047] Optionally, the heat conductive member 500 is used to fill the space between the heat conductive boss 310 and the corresponding battery cell 100 .

[0048] Specifically, the heat conductive member 500 may be a thermally conductive adhesive having good thermal conductivity and adhesiveness. By arranging the thermally conductive adhesive between the thermally conductive boss 310 and the corresponding battery cell 100 , the thermally conductive boss 310 and the corresponding battery cell 100 may be connected and fixed.

[0049] The thermal conductive adhesive can also fill the space between the thermal conductive boss 310 and the corresponding battery cell 100. The surfaces of the thermal conductive boss 310 and the battery cell 100 have a certain degree of roughness, resulting in a small gap between the two when they are in contact, affecting the heat transfer efficiency. The thermal conductive adhesive can be in close contact with both the thermal conductive boss 310 and the battery cell 100 to promote heat transfer.

[0050] The heat conducting member 500 may also be a heat conducting pad, which may be in close contact with both the heat conducting boss 310 and the battery cell 100 to promote heat transfer.

[0051] Alternatively, if Figure 1 and Figure 2 As shown, there are two heating elements 200 and two heat-conducting components 300 , and all the battery cells 100 are located between the two heat-conducting components 300 . The two heating elements 200 are respectively arranged on the sides of the two heat-conducting components 300 away from the battery cells 100 .

[0052] Such an arrangement can improve the uniformity of heating inside a single battery cell 100 , reduce the temperature difference inside a single battery cell 100 , and at the same time help improve the heating efficiency of the battery cell 100 .

[0053] Alternatively, if Figure 3 As shown, the battery cell 100 has a side surface 110 and a top surface 130 connected to each other, and the top surface 130 is provided with a positive pole 131 and a negative pole 132. The heating element 200 is arranged spaced apart from the side surface 110 along a preset direction D1, and the heat-conducting boss 310 is arranged between the heating element 200 and the side surface 110. Further, the battery module 1 also includes a shell 400, and the shell 400 includes a side shell 410 and a top shell 430, the side shell 410 is arranged opposite to the side surface 110, and the top shell 430 is arranged opposite to the top surface 130. The heat-conducting substrate 320 is located between the side shell 410 and the side surface 110.

[0054] Such a configuration can reduce the interference of the arrangement of the positive electrode column 131 and the negative electrode column 132 on the heat conduction function of the heat conduction component 300, improve the heat transfer efficiency, and also reduce the interference of the heat conduction component 300 on the circuit connection between the positive electrode column 131 and the negative electrode column 132, thereby facilitating the assembly of the battery module 1.

[0055] Optionally, there are two adjacent thermally conductive bosses 310 among these thermally conductive bosses 310, and the ratio of the cross-sectional areas of the two adjacent thermally conductive bosses 310 on the same cross-sectional plane is (4.8-5.2):4, (3.8-4.2):3, (2.8-3.2):2 or (1.8-2.2):1. In other words, the ratio of the cross-sectional areas of the thermally conductive bosses 310 corresponding to two adjacent battery cells 100 is (4.8-5.2):4, (3.8-4.2):3, (2.8-3.2):2 or (1.8-2.2):1. Among them, (4.8-5.2) represents any value from 4.8 to 5.2, and the same applies to the others.

[0056] Such an arrangement is beneficial to reducing the temperature difference between different battery cells 100 and improving the working stability of the battery module 1 .

[0057] For example, there are three battery cells 100, which are arranged in sequence, and are marked as B1, A1, and B2 in sequence. The cross-sectional area ratio of the heat-conducting bosses 310 corresponding to B1, A1, and B2 is 5:4:5. According to laboratory data, such an arrangement can make the temperature difference between different battery cells 100 during heating be 1.0°C≤3°C.

[0058] For example, there are 4 battery cells 100, which are arranged in sequence, and are marked as B1, A1, A2, and B2 in sequence. The cross-sectional area ratio of the heat-conducting boss 310 corresponding to B1, A1, A2, and B2 is 5:4:4:5. According to laboratory data, such an arrangement can make the temperature difference between different battery cells 100 during heating be 2.0°C≤3°C.

[0059] For example, there are 5 battery cells 100, which are arranged in sequence, and the cross-sectional area ratio of the heat-conducting bosses 310 corresponding to the 5 battery cells 100 is 5:4:3:4:5. According to laboratory data, such an arrangement can make the temperature difference between different battery cells 100 during heating 2.3°C≤3°C.

[0060] For example, there are 6 battery cells 100, and the 6 battery cells 100 are arranged in sequence. According to the arrangement order, the cross-sectional area ratio of the heat-conducting bosses 310 corresponding to the 6 battery cells 100 is 5:4:3:3:4:5. According to laboratory data, such an arrangement can make the temperature difference between different battery cells 100 during heating 2.4°C≤3°C.

[0061] For example, there are 7 battery cells 100, which are arranged in sequence, and the cross-sectional area ratio of the heat-conducting bosses 310 corresponding to the 7 battery cells 100 is 5:4:3:2:3:4:5. According to laboratory data, such an arrangement can make the temperature difference between different battery cells 100 during heating 1.7°C≤3°C.

[0062] For example, there are 8 battery cells 100, and the 8 battery cells 100 are arranged in sequence. According to the arrangement order, the cross-sectional area ratio of the heat-conducting bosses 310 corresponding to the 8 battery cells 100 is 5:4:3:2:2:3:4:5. According to laboratory data, such an arrangement can make the temperature difference between different battery cells 100 during heating 2.9°C≤3°C.

[0063] For example, there are 9 battery cells 100, which are arranged in sequence, and the cross-sectional area ratio of the heat-conducting bosses 310 corresponding to the 9 battery cells 100 is 5:4:3:2:1:2:3:4:5. According to laboratory data, such an arrangement can make the temperature difference between different battery cells 100 during heating 1.8°C≤3°C.

[0064] For example, there are 10 battery cells 100, and the 10 battery cells 100 are arranged in sequence. According to the arrangement order, the cross-sectional area ratio of the heat-conducting bosses 310 corresponding to the 10 battery cells 100 is 5:4:3:2:1:1:2:3:4:5. According to laboratory data, such an arrangement can make the temperature difference between different battery cells 100 during heating 2.6°C≤3°C.

[0065] To sum up, the present embodiment can realize that the battery cell 100 is heated by the heating element 200 when used in a low temperature scenario, which is beneficial for the battery cell 100 to maintain a normal working state. The heat generated by the heating element 200 is transferred to the battery cell 100 via the heat conductive component 300, which can enhance the reliability of the heating process of the battery cell 100 and reduce the risk probability of excessive local temperature of the battery cell 100 caused by excessive local temperature of the heating element 200. The cross-sectional area of ​​the heat conductive boss 310 corresponding to the battery cell 100 in the middle position is smaller and the heat transfer efficiency is lower. The cross-sectional area of ​​the heat conductive boss 310 corresponding to the battery cell 100 at the edge position is larger and the heat transfer efficiency is higher. This is beneficial to reduce the temperature difference between different battery cells 100 during the heating process of the battery cell 100, improve the balance of the battery cell 100 during operation, improve the heating effect of the heating element 200 and the working stability of the battery cell 100, and reduce the occurrence of risks.

[0066] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery module, characterized in that: include: At least three battery cells arranged in sequence; A heating element, disposed on at least one side of the at least three battery cells along a preset direction, for heating the at least three battery cells; A heat-conducting assembly, comprising heat-conducting bosses corresponding to the at least three battery cells respectively; the heat-conducting bosses are arranged between the heating element and the corresponding battery cells to conduct heat between the heating element and the corresponding battery cells; In the direction from the battery cell at the middle position to the battery cell at the edge position, the cross-sectional areas of the corresponding at least three thermal conductive bosses on the same cross-sectional plane perpendicular to the preset direction gradually increase.

2. The battery module according to claim 1, characterized in that: The cross-sectional areas of the same heat-conducting boss on different cross-sectional planes perpendicular to the preset direction are the same, wherein the preset direction is the same as the length direction of the at least three battery cells.

3. The battery module according to claim 1 or 2, characterized in that: The heat-conducting boss is provided with a hollow groove penetrating the heat-conducting boss along the preset direction.

4. The battery module according to claim 1, characterized in that: The heat-conducting component also includes a heat-conducting substrate, and the corresponding at least three heat-conducting bosses are respectively fixed on the same side of the heat-conducting substrate, and the heating element is attached to the side of the heat-conducting substrate away from the heat-conducting bosses. The heat-conducting substrate is used to conduct heat between the heating element and the corresponding at least three heat-conducting bosses.

5. The battery module according to claim 4, characterized in that: The battery cell has a connected side surface and a bottom surface; the battery module also includes an outer shell, the outer shell includes a side shell and a bottom shell, the side shell is arranged opposite to the side surface of the battery cell, and the bottom shell is arranged opposite to the bottom surface of the battery cell; the thermally conductive substrate is located between the side shell and the side surface of the battery cell; the thermally conductive component also includes a thermally conductive bottom plate, the thermally conductive bottom plate is connected to the thermally conductive substrate and supported between the bottom surface of the battery cell and the bottom shell.

6. The battery module according to claim 4, characterized in that: The battery module further comprises a housing, the heat-conducting substrate is located between the housing and the battery core; a receiving space is formed between the heat-conducting substrate and the housing, and the heating element is located in the receiving space; The heat-conducting substrate is provided with a first clamping portion, and the shell is provided with a second clamping portion, and the first clamping portion is clamped with the second clamping portion so that the heat-conducting substrate is position-limitedly connected with the shell.

7. The battery module according to claim 6, characterized in that: The battery cell has a side surface and a bottom surface connected to each other; the outer shell includes a side shell and a bottom shell, the side shell is arranged opposite to the side surface of the battery cell, and the bottom shell is arranged opposite to the bottom surface of the battery cell; the heat conductive substrate is located between the side shell and the side surface of the battery cell; The first clamping portion includes a protrusion protruding toward the bottom shell, the second clamping portion is arranged on the side shell, and a clamping groove is provided on the side of the second clamping portion facing away from the bottom shell, and the protrusion is inserted into the clamping groove so that the first clamping portion is clamped with the second clamping portion.

8. The battery module according to claim 1, characterized in that: A heat conducting member is arranged between the heat conducting boss and the corresponding battery core; the heat conducting member is used to connect the heat conducting boss and the corresponding battery core, and / or the heat conducting member is used to fill the space between the heat conducting boss and the corresponding battery core.

9. The battery module according to claim 1, characterized in that: There are two heating elements and two heat-conducting components, and the corresponding at least three battery cells are located between the two heat-conducting components. The two heating elements are respectively arranged on one side of the two heat-conducting components away from the battery cells.

10. The battery module according to claim 1, characterized in that: There are two adjacent thermally conductive bosses among the thermally conductive bosses corresponding to at least three of the battery cells, and the ratio of the cross-sectional areas of the two adjacent thermally conductive bosses on the same cross-sectional plane is (4.8-5.2):4, (3.8-4.2):3, (2.8-3.2):2 or (1.8-2.2):1.

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