Battery module, battery module group and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery module, a battery module group and a battery pack, the battery module comprises a fixing structure, a heating piece and at least one battery cell group, the fixing structure comprises two first fixing pieces which are oppositely arranged, the heating piece is located between the two first fixing pieces, the battery cell group comprises two battery cells, and the two first fixing pieces are oppositely arranged. The two battery cells are located between the two first fixing pieces and located on the two sides of the heating piece respectively, the side, facing the heating piece, of each battery cell is in heat conduction connection with the heating piece, the side, deviating from the heating piece, of each battery cell is attached to the corresponding first fixing piece, and the heating effects of the two battery cells in the battery cell set are consistent.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module, a battery module and a battery pack. Background Art

[0002] Power batteries are a core component of new energy vehicles, and their performance directly impacts the vehicle's range, safety, and service life. Low temperatures slow the chemical reaction rate within the battery, reducing its charge and discharge capabilities and range. Furthermore, low temperatures can cause crystallization within the battery, impacting safety. To ensure the performance and safety of power batteries in low-temperature environments, heating elements are required to heat the battery in these conditions.

[0003] Currently, the most common heating element is the electric heating film. In a battery module, an electric heating film is sandwiched between each two adjacent battery cells. This layout means that the battery cells in the middle area are heated by two electric heating films, while the battery cells at the ends are heated by only one electric heating film, resulting in uneven heating of the battery cells in the battery module, which is not conducive to the optimization of the battery pack thermal management system.

[0004] Therefore, there is an urgent need to propose a battery module, a battery module and a battery pack to solve the above technical problems. Utility Model Content

[0005] A first object of the present invention is to provide a battery module, which can make the heating effects of two battery cells in a battery cell group more consistent.

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

[0007] Battery module, including:

[0008] A fixing structure, the fixing structure comprising two first fixing members arranged opposite to each other;

[0009] a heating element, the heating element being located between the two first fixing elements;

[0010] At least one battery cell group includes two battery cells, both battery cells are located between two first fixing members, and the two battery cells are respectively located on both sides of the heating member, a side of each battery cell facing the heating member is thermally connected to the heating member, and a side of each battery cell facing away from the heating member is respectively attached to a corresponding first fixing member.

[0011] Optionally, the battery module further includes a heat conducting member, which is sandwiched between the heating member and the battery cell.

[0012] Optionally, the battery cell is bonded to the heating element;

[0013] and / or, the battery cell is bonded to the first fixing member;

[0014] And / or, the first fixing member is a heat conducting element.

[0015] Optionally, at least one end of the first fixing member is connected to a second fixing member, the side wall of the battery cell that is in contact with the first fixing member is the first side wall, the battery cell further includes a second side wall arranged at an angle to the first side wall, and the second fixing member is used to fix the second side wall.

[0016] Optionally, both opposite ends of the first fixing member are connected to a second fixing member, the two second fixing members located at the same end of the two first fixing members form a group, and at least one group of second fixing members is connected.

[0017] A second object of the present invention is to provide a battery module in which the temperature distribution of the battery cells is highly uniform.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] A battery module comprises at least one of the above-mentioned battery modules.

[0020] Optionally, the number of battery modules is more than two, the cell groups in the two or more battery modules are electrically connected, and the heating elements in the two or more battery modules are electrically connected.

[0021] Optionally, the battery module further includes a first bus bar, and the heating elements in two or more battery modules are electrically connected via the first bus bar.

[0022] Optionally, two or more battery modules are arranged in sequence along a first direction, which is the arrangement direction of two battery cells in the battery cell group, and a buffer pad and / or a thermal insulation pad is sandwiched between two adjacent first fixing members; or, two adjacent first fixing members are bonded and fixed.

[0023] The third object of the present utility model is to provide a battery pack in which the temperature distribution of the battery cells is highly uniform, which is conducive to the optimization of the thermal management system of the battery pack.

[0024] To achieve this purpose, the present invention adopts the following technical solutions:

[0025] The battery pack comprises a battery box and the above-mentioned battery module, wherein the battery module is arranged in the battery box.

[0026] Beneficial effects of the utility model:

[0027] The battery module provided by the present invention comprises a battery cell group including two battery cells, both of which are located between two first fixing members, and the two battery cells are respectively located on both sides of a heating member, a side of each battery cell facing the heating member is thermally connected to the heating member, and a side of each battery cell facing away from the heating member is respectively fitted with a corresponding first fixing member, that is, the heating member can heat the battery cells on both sides thereof at the same time, and only one side of each battery cell is heated by the heating member, while the other side is not heated by the heating member, so that the heating effect of the two battery cells in the battery cell group is relatively consistent.

[0028] The battery module provided by the present invention adopts the above-mentioned battery module, and each battery cell is heated by only one heating element, which improves the uniformity of the temperature distribution of the battery cells in the battery module and is beneficial to the optimization of the battery pack thermal management system.

[0029] The battery pack provided by the present invention adopts the above-mentioned battery module, and the temperature distribution of its battery cells is highly uniform, which is conducive to the optimization of the thermal management system of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 1 is a schematic diagram of the exploded structure of the battery module provided in Example 1;

[0031] Figure 2 is a structural diagram of the battery module provided in Example 1;

[0032] Figure 3 yes Figure 2 AA direction cross-sectional view;

[0033] Figure 4 is a schematic cross-sectional view of the fixing structure provided in Example 1;

[0034] Figure 5 This is a schematic diagram of the exploded structure of the battery module provided in Example 1;

[0035] Figure 6 is a structural diagram of a battery module provided in Example 1;

[0036] Figure 7 1 is a schematic diagram of the assembly structure of the heating element and the first busbar provided in Example 1;

[0037] Figure 8 1 is a schematic diagram of the assembly structure of the first heat exchange element and the battery module provided in Example 1;

[0038] Figure 9 1 is a schematic diagram of the assembly structure of the second heat exchange element and the battery box provided in Example 1;

[0039] Figure 10 is a schematic cross-sectional view of the fixing structure provided in Example 2;

[0040] Figure 11 is a schematic cross-sectional view of the fixing structure provided in Example 3;

[0041] Figure 12 It is a schematic cross-sectional view of the fixing structure provided in the fourth embodiment.

[0042] In the picture:

[0043] 1. Battery module; 2. Buffer pad; 3. Output bus; 4. Fourth bus; 5. First bus;

[0044] 100, fixing structure; 110, first fixing member; 120, second fixing member; 130, third fixing member; 140, fourth fixing member; 150, accommodating cavity; 161, perforation; 200, heating element; 210, conductive portion; 300, battery cell group; 310, battery cell; 400, second busbar;

[0045] 10. Battery box; 20. First heat exchange element; 30. Second heat exchange element. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0047] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0050] Example 1

[0051] This embodiment provides a battery module, which can achieve a relatively consistent heating effect on two battery cells in a battery cell group.

[0052] Specifically, if Figures 1 to 3 As shown, the battery module 11 includes a fixing structure 100, a heating element 200, and at least one battery cell group 300, wherein the fixing structure 100 includes two first fixing elements 110 arranged opposite to each other, the heating element 200 is located between the two first fixing elements 110, and the battery cell group 300 includes two battery cells 310, both of which are located between the two first fixing elements 110, and the two battery cells 310 are respectively located on both sides of the heating element 200, and the side of each battery cell 310 facing the heating element 200 is thermally connected to the heating element 200, and the side of each battery cell 310 facing away from the heating element 200 is respectively attached to a corresponding first fixing element 110. In this embodiment, the number of battery cell groups 300 is two, and in other embodiments, the number of battery cell groups 300 can also be one, three, or four.

[0053] Based on the above design, the battery cell group 300 includes two battery cells 310, both of which are located between the two first fixing members 110, and the two battery cells 310 are respectively located on both sides of the heating member 200. The side of each battery cell 310 facing the heating member 200 is thermally connected to the heating member 200, and the side of each battery cell 310 facing away from the heating member 200 is respectively attached to a corresponding first fixing member 110, that is, the heating member 200 can heat the battery cells 310 on both sides at the same time, and each battery cell 310 is heated by the heating member 200 on only one side, while the other side is not heated by the heating member 200, so that the heating effect of the two battery cells 310 in the battery cell group 300 is relatively consistent. On the other hand, the heating member 200 and the battery cell group 300 are both arranged between the two first fixing members 110, which can improve the overall structural strength of the battery module 1.

[0054] Furthermore, the heating element 200 is a heating film or a heating plate, etc., which can be determined according to actual production requirements.

[0055] Alternatively, as Figures 1 to 3As shown, the entire surface of the battery cell 310 facing the heating element 200 is thermally connected to the heating element 200, so as to expand the area of ​​the battery cell 310 heated by the heating element 200 and improve the heating efficiency of the battery cell 310 by the heating element 200. Of course, in other embodiments, part of the surface of the battery cell 310 facing the heating element 200 may be thermally connected to the heating element 200. In this embodiment, the entire surface of the battery cell 310 facing the heating element 200 is in contact with the heating element 200, that is, the heating surfaces on both sides of the heating element 200 can respectively cover the heated surface of a corresponding battery cell 310, which is the surface of the battery cell 310 facing the heating element 200.

[0056] Furthermore, if Figures 1 to 3 As shown, in this embodiment, there are two battery cell groups 300, and the battery module 1 further includes a second busbar 400. In different battery cell groups 300, the battery cells 310 located on the same side of the heating element 200 are electrically connected via the second busbar 400, so that the battery cells 310 located on the same side of the heating element 200 are connected in series. Furthermore, the second busbar 400 is connected to the tabs of the battery cells 310 by laser welding or resistance welding.

[0057] It can be understood that when the number of battery cell groups 300 is three or more, the battery cells 310 located on the same side of the heating element 200 can be electrically connected through the same second bus 400, or every two adjacent battery cells 310 located on the same side of the heating element 200 can be electrically connected through a second bus 400.

[0058] Optionally, the side of the battery cell 310 facing the heating element 200 is bonded to the heating element 200 by glue, double-sided tape, or thermally conductive adhesive, so that the battery cell 310 and the heating element 200 form a rigid connection, thereby improving the reliability of the connection between the battery cell 310 and the heating element 200 and improving the heating efficiency of the heating element 200 on the battery cell 310. Preferably, the battery cell 310 is bonded to the heating element 200 by thermally conductive adhesive to improve the heat conduction efficiency between the thermally conductive element and the battery cell 310.

[0059] Optionally, the first fixing member 110 is a heat-conducting element. Heat generated by the battery cell 310 during charging and discharging can be transferred to the first fixing member 110 through the side facing away from the heating element 200. The first fixing member 110, which is thermally conductive, transfers the heat out of the battery module 1, allowing the battery cell 310 to dissipate heat efficiently. Optionally, the first fixing member 110 is made of a thermally conductive material such as aluminum.

[0060] Furthermore, the side of the battery cell 310 facing away from the heating element 200 is bonded to the first fixing element 110 by glue or double-sided tape to improve the thermal conductivity between the battery cell 310 and the first fixing element 110, thereby improving the heat dissipation efficiency of the battery cell 310; and the bonding structure of the battery cell 310 and the first fixing element 110 can also improve the structural strength of the battery module 1.

[0061] In another embodiment, the first fixing member 110 is a non-heat-conducting element, and the side of the battery cell 310 facing away from the heating element 200 is bonded to the first fixing member 110 to prevent the heat transferred from the heating element 200 to the battery cell 310 from being transferred to the outside of the battery module 1 through the first fixing member 110. It can be seen that the design of the first fixing member 110 as a non-heat-conducting element can have an insulation effect on the battery cell 310, and thus this structural design is conducive to improving the heating efficiency of the battery cell 310. When the battery module 1 is in a cold environment, it can reduce heat loss, so that the battery module 1 can be suitable for cold environments.

[0062] The battery module 11 in this embodiment is mainly suitable for square battery cells 310 (soft-pack battery cells 310, hard-shell battery cells 310, etc.). In order to improve the heating efficiency and cooling efficiency of the battery cells 310, one large surface of the battery cell 310 is attached to the heating element 200, and the other large surface of the battery cell 310 is attached to the side wall, so that the battery cell 310 can achieve rapid heating and rapid cooling effects.

[0063] Alternatively, as Figures 1 to 4 As shown, at least one end of the first fixing member 110 is connected to the second fixing member 120. The side wall of the battery cell 310 that contacts the first fixing member 110 is the first side wall. The battery cell 310 also includes a second side wall arranged at an angle to the first side wall. The second fixing member 120 is used to fix the second side wall to protect the first and second side walls of the battery cell 310 from being bumped. It should be noted that the second side wall and the second fixing member 120 can be in contact with each other, or other components can be interposed between the second side wall and the second fixing member 120, depending on the actual application.

[0064] Furthermore, if Figures 1 to 4 As shown, the second fixing members 120 are connected to the opposite ends of the first fixing member 110, and the two second fixing members 120 located at the same end of the two first fixing members 110 form a group. The two second fixing members 120 in each group of second fixing members 120 are connected to each other, so that the fixing structure 100 forms a accommodating cavity 150 with openings on both sides, and the heating member 200 and the battery cell group 300 are both arranged in the accommodating cavity 150.

[0065] In this embodiment, Figures 1 to 4As shown, the two second fixing members 120 in one of the two groups of second fixing members 120 are in direct contact and connected to each other (they can be arranged opposite each other and connected or overlapped), and the two second fixing members 120 in the other group are spaced apart and connected via a third fixing member 130. Of course, in other embodiments, the two second fixing members 120 in each group of second fixing members 120 can also be in direct contact and connected to each other, or the two second fixing members 120 in each group of second fixing members 120 can be spaced apart and connected via a third fixing member 130 respectively.

[0066] In this embodiment, the first side wall of the battery cell 310 is connected to and perpendicular to the second side wall, and the first fixing member 110 is perpendicular to the second fixing member 120. In other embodiments, the first side wall and the second side wall may also be spaced apart, and the angle between the first side wall and the second side wall may also be 45° or 60°, etc.

[0067] Furthermore, if Figures 1 to 4 As shown, the fixing structure 100 also includes two fourth fixing members 140, which are respectively sealed at a corresponding opening, and each fourth fixing member 140 is welded and fixed to the first fixing member 110 and the second fixing member 120 adjacent thereto, and a through-hole 161 is provided on the fourth fixing member 140. The battery module 1 also includes two third busbars, each of which is respectively located at a corresponding fourth fixing member 140. In the same battery cell group 300 close to the fourth fixing member 140, the tabs of the two battery cells 310 facing the fourth fixing member 140 are both passed through the through-hole 161 of the fourth fixing member 140, and are both fixedly connected to the third busbar by laser welding or resistance welding, so as to realize parallel connection of the two battery cells 310 in the same battery cell group 300.

[0068] In this embodiment, Figures 1 to 4 As shown, two battery cells 310 in the same battery cell group 300 are distributed along the x-direction, and two battery cell groups 300 are distributed along the y-direction. The battery cells 310 are square, and the two second side walls of the battery cells 310 are arranged opposite to each other along the z-direction. The two second fixing members 120 on the same first fixing member 110 are arranged opposite to each other in the z-direction, and the two fourth fixing members 140 are arranged opposite to each other along the y-direction.

[0069] This embodiment provides a battery module in which the temperature distribution of the battery cells 310 is highly uniform.

[0070] Specifically, the battery module includes at least one of the above-mentioned battery modules 1, and each battery cell 310 is heated by only one heating element 200, which improves the uniformity of the temperature distribution of the battery cells 310 in the battery module and is beneficial to the optimization of the battery pack thermal management system.

[0071] Furthermore, if Figures 5 and 6 As shown, there are two or more battery modules 1, the cell groups 300 in the two or more battery modules 1 are electrically connected, and the heating elements 200 in the two or more battery modules 1 are electrically connected. In this embodiment, there are six battery modules 1. Of course, in other embodiments, the number of battery modules 1 can also be two, three, or eight, etc., depending on actual application requirements.

[0072] Furthermore, if Figure 1 、 Figure 5 and Figure 6 As shown, two or more battery modules 1 are arranged along a first direction ( Figure 1 and Figure 5 The first direction is the arrangement direction of the two battery cells 310 in the battery cell group 300, so that the distribution of the battery modules 1 is more regular, which is beneficial to improving the internal space utilization of the battery box 10, and further beneficial to improving the energy density of the battery pack.

[0073] Furthermore, if Figures 5 and 6 As shown, a cushion pad 2, such as foam, is sandwiched between two adjacent first fixing members 110 to absorb the expansion of the battery cell 310 during charging and discharging. Preferably, both surfaces of the cushion pad 2 are bonded to a corresponding first fixing member 110 to improve the reliability of the connection between the battery module 1 and the cushion pad 2.

[0074] In another embodiment, a thermal insulation pad is placed between two adjacent first fixing members 110. If thermal runaway occurs in a battery cell 310, the pad can prevent the spread of fire, thereby improving the safety of the battery module. Preferably, both surfaces of the pad are bonded to a corresponding first fixing member 110 to improve the reliability of the connection between the battery module 1 and the pad.

[0075] In another embodiment, a buffer pad 2 and a heat insulating pad are sandwiched between two adjacent first fixing members 110 , which can not only absorb the expansion generated during the charge and discharge process of the battery cell 310 , but also provide a heat insulating effect.

[0076] In another embodiment, two adjacent first fixing members 110 are bonded and fixed to achieve a rigid connection between the two adjacent first fixing members 110 , which has the effect of improving the overall structural strength of the battery module.

[0077] In the prior art, multiple electric heating films in the same battery module are usually electrically connected using connector terminals. Specifically, a heating film harness is reserved in the battery module, and a terminal is reserved at the connection point of the electric heating film. When assembling the battery module, the heating film harness is plugged into the terminal. This structural design requires that space for the heating film harness and the terminal be reserved at the battery module level. Not only does it take up a large space, but the plugging of the heating film harness and the terminal during assembly is also cumbersome, which is not conducive to the integrated layout and management of the battery module. To solve this technical problem, the technical solution provided in this embodiment is as follows: Figures 5 to 7 As shown, the battery module also includes a first bus bar 5, and the heating elements 200 in two or more battery modules 1 are electrically connected through the first bus bar 5. The electrical connection of multiple heating elements 200 in the battery module can be achieved through the setting of the first bus bar 5, eliminating the need to reserve heating film wiring harness space and terminal space at the battery module level, reducing the overall volume of the battery module, and simplifying the operational difficulty of electrically connecting multiple heating elements 200.

[0078] Furthermore, the heating element 200 is provided with a conductive portion 210, and the first busbar 5 is electrically connected to the heating element 200 via the conductive portion 210. It should be noted that two adjacent heating elements 200 are electrically connected via the first busbar 5, and the electrical connection can be in series or in parallel, depending on actual production and use requirements.

[0079] Furthermore, after the multiple heating elements 200 are electrically connected through a plurality of first busbars 5, they are electrically connected to the relay of the battery disconnect unit (BDU) of the battery pack to realize control of the multiple heating elements 200. It should be noted that the method of controlling the heating elements 200 by the relay of the BDU is a prior art in the field and will not be repeated here.

[0080] Optionally, the first busbar 5 is overlap-welded on the conductive portion 210 , and the first busbar 5 can be fixedly connected to the conductive portion 210 by laser welding or resistance welding.

[0081] Furthermore, the conductive portion 210 may be a metal sheet made of copper or aluminum. The conductive portion 210 is parallel to the first busbar 5 to facilitate lap welding with the first busbar 5 .

[0082] Alternatively, as Figures 5 to 7As shown, the battery module also includes a fourth busbar 4. In two adjacent battery modules 1, the tabs located on the same side are electrically connected to the same fourth busbar 4 by laser welding or resistance welding, thereby achieving series connection of the two adjacent battery modules 1. Specifically, in two adjacent battery modules 1, the tabs located on the same side have opposite polarities. Therefore, by electrically connecting these two tabs to the same fourth busbar 4, the two adjacent battery modules 1 can be connected in series.

[0083] Alternatively, as Figures 5 to 7 As shown, the battery module further includes two output rows 3, and the tabs of the two outermost battery modules 1 in the first direction are electrically connected to a corresponding output row 3 respectively by laser welding or resistance welding.

[0084] It should be noted that the first busbar 5, the second busbar 400, the third busbar, the fourth busbar 4, and the output busbar 3 can be made of conductive materials such as copper or aluminum. This embodiment also provides a battery pack having a highly uniform temperature distribution of the battery cells 310, which facilitates optimization of the battery pack's thermal management system.

[0085] Specifically, the battery pack includes a battery box 10 and the aforementioned battery module, which is disposed within the battery box 10. The battery pack employs the aforementioned battery module, and the temperature distribution of the battery cells 310 is highly uniform, which is beneficial to the optimization of the battery pack thermal management system.

[0086] Furthermore, the battery pack further includes a heat exchanger, which is disposed in the battery box 10. At least one first fixing member 110 is a heat conducting element, and the first fixing member 110 is thermally connected to the heat exchanger. Figure 8 and Figure 9 As shown, the heat exchange member includes a first heat exchange member 20 and a second heat exchange member 30. The first heat exchange member 20 and the second heat exchange member 30 are both plate-shaped. A first heat exchange member 20 is sandwiched between each two adjacent battery modules 1. The second heat exchange member 30 is arranged at the bottom of the battery box 10, and the battery module is arranged on the second heat exchange member 30. When the first heat exchange member 20 and the second heat exchange member 30 are cooling plates (such as water-cooled plates or liquid-cooled plates, etc.), the heat emitted by the battery cell 310 can be transferred to the first fixing member 110 through the first fixing member 110. The heat exchange member 20 is connected to the second heat exchange member 30 through the first fixing member 110 and the second fixing member 120, thereby cooling the battery cell 310. When the first heat exchange member 20 and the second heat exchange member 30 are heating plates (such as hot water plates or electric heating plates), the heat emitted by the first heat exchange member 20 can be transferred to the battery cell 310 through the first fixing member 110, and the heat emitted by the second heat exchange member 30 is transferred to the battery cell 310 through the second fixing member 120 and the first fixing member 110, thereby heating the battery cell 310.

[0087] In this embodiment, one surface of the battery cell 310 is in contact with the heating element 200, and the other surface is in contact with the first fixing element 110. Therefore, when the first heat exchange element 20 is a heating plate, the heat emitted by the first heat exchange element 20 is transferred to the surface of the battery cell 310 facing away from the heating element 200 through the first fixing element 110, so that one surface of the battery cell 310 is heated by the heating element 200 and the other surface is heated by the first heat exchange element 20, thereby achieving the effect of reducing the temperature difference between the two opposite surfaces of the same battery cell 310.

[0088] It can be understood that the specific heat exchange principle of the first heat exchange element 20 and the second heat exchange element 30 is the existing technology in this field. For example: the first heat exchange element 20 and the second heat exchange element 30 are both connected to the heat exchange source, and a heat exchange medium (such as water or common refrigerant, etc.) flows between the first heat exchange element 20 and the heat exchange source and between the second heat exchange element 30 and the heat exchange source respectively. The heat exchange medium is selectively a cooling medium or a heating medium. When the battery cell 310 needs to be cooled, the heat exchange source cools the heat exchange medium so that the heat exchange medium is a cooling medium (such as cold water with a lower temperature). When the battery cell 310 needs to be heated, the heat exchange source heats the heat exchange medium so that the heat exchange medium is a heating medium (such as hot water with a higher temperature). The design structure is simple, and it is only necessary to adjust the temperature of the medium introduced into the heat exchange plate according to usage requirements.

[0089] The heat pipes are fixedly connected in sequence along a direction parallel to the axis of the first heat pipe to form a first heat pipe heat exchange plate. The phase change medium filled in the first heat pipe absorbs heat from the battery cell 310 and evaporates into a gaseous state to cool the battery cell 310. The phase change medium filled in the first heat pipe releases heat to the battery cell 310 and condenses into a gaseous state to heat the battery cell 310. The second heat exchange element 30 includes a plurality of second heat pipes, which are fixedly connected in sequence along a direction parallel to the axis of the second heat pipe to form a second heat pipe heat exchange plate. The phase change medium filled in the second heat pipe absorbs heat from the battery cell 310 and evaporates into a gaseous state to cool the battery cell 310. The phase change medium filled in the second heat pipe releases heat to the battery cell 310 and condenses into a gaseous state to heat the battery cell 310. The specific structure and working principle of the heat pipe are prior art in the field and will not be described in detail here.

[0090] Example 2

[0091] This embodiment provides a battery module 1. The difference between this battery module 1 and the battery module 1 provided in the first embodiment is that:

[0092] like Figure 10As shown, the opposite ends of the first fixing member 110 are connected to the second fixing members 120 , and the two second fixing members 120 located at the same end of the two first fixing members 110 form a group, and the two second fixing members 120 in each group of second fixing members 120 are arranged at intervals.

[0093] It should be pointed out that the fixing structure 100 provided in this embodiment can be a structure having two gaps in the z direction (that is, a gap is formed between the two second fixing members 120 in each group of second fixing members 120), or it can be a structure in which the two second fixing members 120 in each group of second fixing members 120 are connected by a third fixing member 130, that is, the fixing structure 100 has no gap in the z direction, which can be determined according to actual application requirements.

[0094] The rest of the structure of the battery module 1 provided in this embodiment is the same as that in the first embodiment and will not be described again.

[0095] Example 3

[0096] This embodiment provides a battery module 1. The difference between this battery module 1 and the battery module 1 provided in the first embodiment is that:

[0097] like Figure 11 As shown, the second fixing members 120 are connected to both opposite ends of the first fixing member 110. The two second fixing members 120 located at the same end of the two first fixing members 110 form a group, and the two second fixing members 120 in each group of second fixing members 120 are in direct contact and connected to each other.

[0098] The rest of the structure of the battery module 1 provided in this embodiment is the same as that in the first embodiment and will not be described again.

[0099] Example 4

[0100] This embodiment provides a battery module 1. The difference between this battery module 1 and the battery module 1 provided in the first embodiment is that:

[0101] like Figure 12 As shown, the first fixing member 110 is provided with the second fixing member 120 at only one end, the second fixing members 120 of the two first fixing members 110 are arranged at intervals, or the second fixing members 120 of the two first fixing members 110 are arranged at intervals and connected by a third fixing member 130, or the second fixing members 120 of the two first fixing members 110 are connected to each other, and the other ends of the two first fixing members 110 are arranged at intervals to form a gap.

[0102] The rest of the structure of the battery module 1 provided in this embodiment is the same as that in the first embodiment and will not be described in detail.

[0103] Example 5

[0104] This embodiment provides a battery module. The difference between this battery module and the battery module provided in the first embodiment is that:

[0105] In the first embodiment, the six battery modules 1 correspond to six third fixing members 130 respectively, that is, the fixing structure 100 of each battery module 1 includes one third fixing member 130 .

[0106] In this embodiment, the six battery modules 1 share a third fixing member 130, that is, the gaps in the six fixing structures 100 in the z direction are blocked by the same third fixing member 130, so that the six battery modules 1 form a whole, thereby improving the stability of the connection of the six battery modules 1 in the battery module.

[0107] The rest of the structure of the battery module provided in this embodiment is the same as that of the first embodiment and will not be described in detail.

[0108] Example 6

[0109] This embodiment provides a battery module 1. The difference between this battery module 1 and the battery module 1 provided in the first embodiment is that:

[0110] The battery module 1 also includes a heat conducting member, which is sandwiched between each battery cell 310 and the heating element 200 to improve the heat conduction efficiency between the heating element 200 and the battery cell 310. Furthermore, the heat conducting member can be a heat conducting film or a heat conducting coating, etc., depending on actual production requirements.

[0111] The rest of the structure of the battery module 1 provided in this embodiment is the same as that in the first embodiment and will not be described again.

[0112] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery module, characterized in that: include: A fixing structure (100), the fixing structure (100) comprising two first fixing members (110) arranged opposite to each other; a heating element (200), the heating element (200) being located between the two first fixing elements (110); At least one battery cell group (300), the battery cell group (300) comprising two battery cells (310), the two battery cells (310) being located between the two first fixing members (110), and the two battery cells (310) being located on both sides of the heating member (200), the side of each battery cell (310) facing the heating member (200) being thermally connected to the heating member (200), and the side of each battery cell (310) facing away from the heating member (200) being respectively in contact with a corresponding one of the first fixing members (110).

2. The battery module according to claim 1, wherein: The battery module (1) further comprises a heat conducting member, and the heat conducting member is sandwiched between each of the battery cells (310) and the heating member (200).

3. The battery module according to claim 1, wherein: The battery core (310) is bonded to the heating element (200); and / or, the battery core (310) is bonded to the first fixing member (110); And / or, the first fixing member (110) is a heat conducting element.

4. The battery module according to claim 1, wherein: At least one end of the first fixing member (110) is connected to a second fixing member (120); the side wall of the battery cell (310) abutting against the first fixing member (110) is a first side wall; the battery cell (310) further comprises a second side wall arranged at an angle to the first side wall; and the second fixing member (120) is used to fix the second side wall.

5. The battery module according to claim 4, characterized in that The second fixing members (120) are connected to both opposite ends of the first fixing member (110), and the two second fixing members (120) located at the same end of the two first fixing members (110) form a group, and at least one group of the second fixing members (120) is connected.

6. A battery module, characterized in that: Comprising at least one battery module (1) according to any one of claims 1 to 5.

7. The battery module according to claim 6, characterized in that: The number of the battery modules (1) is more than two, the battery cell groups (300) in the two or more battery modules (1) are electrically connected, and the heating elements (200) in the two or more battery modules (1) are electrically connected.

8. The battery module according to claim 7, characterized in that: The battery module further comprises a first busbar (5), and the heating elements (200) in two or more battery modules (1) are electrically connected via the first busbar (5).

9. The battery module according to claim 7, characterized in that: Two or more battery modules (1) are arranged in sequence along a first direction, the first direction being the arrangement direction of two battery cells (310) in the battery cell group (300), and a buffer pad (2) and / or a heat insulating pad is sandwiched between two adjacent first fixing members (110); or, two adjacent first fixing members (110) are bonded and fixed.

10. A battery pack, characterized in that: It comprises a battery box (10) and a battery module according to any one of claims 6 to 9, wherein the battery module is arranged in the battery box (10).

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