Battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack which comprises a battery box body, cylindrical batteries, a partition plate and a pressing plate, the battery box body comprises a bottom plate; the cylindrical battery is arranged in the battery box, the axial direction of the cylindrical battery is parallel to the first direction of the bottom plate, the cylindrical battery is provided with a first end surface, a second end surface and a side surface, the first end surface and the second end surface are arranged in the first direction in a spaced mode and are perpendicular to the first direction, and the side surface is connected between the first end surface and the second end surface. The surface of the second end is connected with a conducting bar, and the conducting bar is connected to the electrode output ends of the two adjacent cylindrical batteries; the partition plate is provided with a contact surface facing the first end surface and perpendicular to the bottom plate. The pressing plate is arranged on the side, back to the bottom plate, of the cylindrical battery, and on a reference plane parallel to the bottom plate, the orthographic projection pattern of the pressing plate and the orthographic projection pattern of the partition plate are partially overlapped.

Description

Technical Field

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

[0002] In the existing design of battery packs, some battery packs adopt the design of lying cylindrical batteries, that is, the axial direction of the cylindrical battery is parallel to the bottom plate of the battery box, and the heat exchange plate is arranged on the bottom plate in a relatively vertical form, the side of the heat exchange plate faces one end face of the cylindrical battery to achieve contact heat exchange, and the other end face of the cylindrical battery facing away from the heat exchange plate is connected to a conductive bar. However, since the end face of the heat exchange plate facing the heat exchange plate is not connected to the conductive bar, the part of the cylindrical battery adjacent to the end face is prone to warping away from the bottom plate under vibration conditions, resulting in poor vertical mode of the battery pack. Utility Model Content

[0003] A main purpose of the present invention is to overcome at least one defect of the above-mentioned prior art and provide a battery pack with better vertical mode.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] According to one aspect of the utility model, a battery pack is provided, which includes a battery case, a cylindrical battery, a partition and a pressure plate; the battery case includes a bottom plate; the cylindrical battery is arranged in the battery case, and its axial direction is a first direction parallel to the bottom plate, the cylindrical battery has a first end surface, a second end surface and a side surface, the first end surface and the second end surface are arranged at intervals in the first direction and are respectively perpendicular to the first direction, the side surface is connected between the first end surface and the second end surface, the second end surface is connected to a conductive row, and the conductive row is connected to the electrode output ends of two adjacent cylindrical batteries; the partition has a contact surface facing the first end surface and perpendicular to the bottom plate; the pressure plate is arranged on the side of the cylindrical battery facing away from the bottom plate, and on a reference plane parallel to the bottom plate, the orthographic projection pattern of the pressure plate partially overlaps with the orthographic projection pattern of the partition.

[0006] It can be seen from the above technical solutions that the advantages and positive effects of the battery pack proposed by the utility model are:

[0007] The battery pack proposed by the utility model adopts an arrangement in which cylindrical batteries are lying and partitions are standing; the contact surface of the partition faces the first end surface of the cylindrical battery, and the second end surface of the cylindrical battery facing away from the partition is connected to a conductive bar. On this basis, a pressure plate is provided on the side of the battery pack that faces away from the bottom plate of the cylindrical battery. On a reference plane parallel to the bottom plate, the orthographic projection pattern of the pressure plate partially overlaps with the orthographic projection pattern of the partition, which is used to constrain the area adjacent to the first end surface of the cylindrical battery. Through the above-mentioned structural design, the utility model can use the pressure plate to constrain the cylindrical battery, avoid the part of the cylindrical battery adjacent to the partition from warping, and optimize the mode of the battery pack in the direction perpendicular to the bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0009] Figure 1 is a schematic diagram of a three-dimensional structure of a battery pack according to an exemplary embodiment;

[0010] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in FIG.

[0011] Figure 3 yes Figure 1 A schematic diagram of a three-dimensional structure of a partial structure shown;

[0012] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional decomposition of

[0013] Figure 5 yes Figure 3 A partial top view of

[0014] Figure 6 yes Figure 1 A schematic diagram of the three-dimensional structure of a cylindrical battery is shown.

[0015] The following are the descriptions of the reference numerals:

[0016] 100. Battery box;

[0017] 110. Bottom plate;

[0018] 1101. Module base plate;

[0019] 200. Cylindrical battery;

[0020] 201. Battery column;

[0021] 202. Battery pack;

[0022] 210. First end surface;

[0023] 220. Second end surface;

[0024] 230. Lateral surface;

[0025] 300. Partition;

[0026] 310. Contact surface;

[0027] 400. Press plate;

[0028] 500. Conductive bar;

[0029] L1. Length;

[0030] L2. Length;

[0031] X. First direction;

[0032] Y. Second direction;

[0033] Z. Third direction. DETAILED DESCRIPTION

[0034] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0035] In the following description of different exemplary embodiments of the utility model, reference is made to the accompanying drawings, which form a part of the utility model and in which different exemplary structures, systems and steps that can implement multiple aspects of the utility model are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the utility model. Moreover, although the terms "above", "between", "within", etc. can be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0036] See also Figure 1, which representatively shows a three-dimensional structural schematic diagram of the battery pack proposed by the utility model. In this exemplary embodiment, the battery pack proposed by the utility model is described by taking a vehicle-mounted battery as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the utility model to other types of battery devices, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the battery pack proposed by the utility model.

[0037] like Figure 1 As shown, in one embodiment of the present invention, the battery pack provided by the present invention includes a battery box 100, a cylindrical battery 200, a partition 300 and a pressing plate 400. Figures 2 to 5 , Figure 2 A representative example is shown in Figure 1 An enlarged schematic diagram of part A in FIG. Figure 3 A representative example is shown in Figure 1 A three-dimensional schematic diagram of a partial structure is shown, in which the exploded structure of the separator 300, a part of the cylindrical battery 200 and the pressing plate 400 is specifically shown; Figure 4 A representative example is shown in Figure 3 Schematic diagram of the three-dimensional decomposition of Figure 5 A representative example is shown in Figure 3 A partial top view of Figure 6 A representative example is shown in Figure 1 The three-dimensional structure diagram of the cylindrical battery 200 is shown. The structure, connection mode and functional relationship of each main component of the battery pack proposed by the utility model will be described in detail below in combination with the above drawings.

[0038] like Figures 1 to 6As shown, in one embodiment of the present utility model, the battery case 100 includes a bottom plate 110. The cylindrical battery 200 is disposed in the battery case 100, and the cylindrical battery 200 is arranged in a "lying" manner, and the so-called "lying" is relative to the bottom plate 110, that is, the axial direction of the cylindrical battery 200 is parallel to the first direction X of the bottom plate 110. The cylindrical battery 200 has a first end surface 210, a second end surface 220 and a side surface 230, the first end surface 210 and the second end surface 220 are arranged at intervals in the first direction X, the side surface 230 is connected between the first end surface 210 and the second end surface 220, and the second end surface 220 of the cylindrical battery 200 is connected to a conductive bar 500. The partition 300 is arranged vertically relative to the bottom plate 110, that is, the partition 300 is arranged in a "standing" manner relative to the bottom plate 110. Specifically, the partition 300 has a contact surface 310 facing the first end surface 210 and perpendicular to the bottom plate 110. The pressing plate 400 is disposed on the side of the cylindrical battery 200 facing away from the bottom plate 110 and arranged corresponding to the area of ​​the side surface 230 adjacent to the first end surface 210. The pressing plate 400 is suitable for constraining the area of ​​the cylindrical battery 200 adjacent to the first end surface 210 to prevent it from warping away from the bottom plate 110. Through the above structural design, the utility model can use the pressing plate 400 to constrain the cylindrical battery 200, prevent the part of the cylindrical battery 200 adjacent to the partition 300 from warping, and optimize the mode of the battery pack in the direction perpendicular to the bottom plate 110.

[0039] like Figures 3 to 5 As shown, in one embodiment of the present invention, at least two cylindrical batteries 200 are arranged into a battery column 201 along the second direction Y, and the second direction Y is parallel to the bottom plate 110 and parallel to the contact surface 310 of the partition 300, and the first end surface 210 of each cylindrical battery 200 belonging to the same battery column 201 faces a contact surface 310 of the partition 300 at the same time. On this basis, the pressing plate 400 can be in a long strip shape and extend along the second direction Y, that is, the length direction of the pressing plate 400 is the second direction Y, that is, the cylindrical batteries 200 belonging to the same battery column 201 are arranged along the length direction of the pressing plate 400. Among them, the pressing plate 400 can simultaneously constrain each cylindrical battery 200 belonging to the same battery column 201. Through the above structural design, the utility model can make full use of the internal space of the battery box 100 to arrange the cylindrical battery 200, which is beneficial to improve the energy density of the battery pack, and on this basis, use a pressure plate 400 to simultaneously realize the constraint of at least two cylindrical batteries 200 contained in a battery column 201, which is beneficial to reduce the number of parts and simplify the complexity of the structure. In some embodiments, for each cylindrical battery 200 belonging to a battery column 201, at least two pressure plates 400 can also be arranged to constrain it, and each pressure plate 400 constrains at least one cylindrical battery 200, which is not limited to this embodiment.

[0040] like Figures 3 to 5 As shown, based on the structural design that the pressing plate 400 simultaneously constrains each cylindrical battery 200 belonging to the same battery column 201, in one embodiment of the present invention, the battery columns 201 can be respectively arranged on both sides of the partition 300 in the first direction X. In other words, for two adjacent battery columns 201 in the first direction X, the cylindrical batteries 200 of the two are arranged with their respective first end surfaces 210 facing each other (that is, arranged with their respective second end surfaces 220 facing each other), and the first end surfaces 210 of the cylindrical batteries 200 of the two are respectively facing the two contact surfaces 310 on both sides of the partition 300. On this basis, the pressing plate 400 can simultaneously constrain the two battery columns 201 on both sides of the partition 300. Through the above structural design, the present invention can use the partition 300 to support and fix the two battery columns 201 arranged in the first direction X, and on this basis, use a pressing plate 400 to simultaneously constrain the cylindrical batteries 200 on both sides of the partition 300, which is conducive to further reducing the number of components and further simplifying the complexity of the structure. Furthermore, when the partition 300 is a heat exchange plate, heat exchange can also be simultaneously achieved between two battery columns 201 arranged in the first direction X. In some embodiments, for the cylindrical batteries 200 located on both sides of the partition 300 in the first direction X, the utility model can also respectively set a pressing plate 400 to constrain them, which is not limited to this embodiment.

[0041] like Figure 5As shown, based on the structural design that the pressing plate 400 simultaneously constrains the two battery columns 201 on both sides of the partition 300, in one embodiment of the present utility model, the pressing plate 400 can be a flat plate structure, the pressing plate 400 crosses the side of the partition 300 facing away from the bottom plate 110 along the first direction X, and the two side edges of the pressing plate 400 in the first direction X respectively constrain the cylindrical batteries 200 on both sides of the partition 300. In some embodiments, the pressing plate 400 may also include a connecting portion and two constraining portions, the connecting portion is connected to the partition 300, the two constraining portions are respectively connected to the two sides of the connecting portion in the first direction X, and the two constraining portions respectively constrain the two battery columns 201 on both sides of the partition 300, and the constraining portion coincides with the projection of the circumference of the cylindrical battery 200, thereby preventing the cylindrical battery from warping up. In addition, the portion of the pressing plate 400 that spans the partition 300 can be bonded and fixed to the partition 300 via an adhesive layer. Through the above-mentioned structural design, the utility model can use the connecting part to connect the pressing plate 400 with the partition 300, which is convenient for the arrangement of the pressing plate 400 and realizes the constraint of the cylindrical battery 200. In addition, after the pressing plate 400 is fixedly connected to the partition 300, the partition 300 and the pressing plate 400 can be used to limit the cylindrical battery 200, that is, the pressing plate 400 can use the partition 300 to help the partition 300, which is more conducive to the modal. Further, when the partition 300 is a heat exchange plate, and the pressing plate 400 can play a certain role in heat transfer, it can improve the thermal conductivity to a certain extent. In some embodiments, the pressing plate 400 can also be relatively fixed to the battery box 100 or other structures in other ways, so as to locate the relative position of the pressing plate 400 and the cylindrical battery 200 to realize the constraint function, so the pressing plate 400 can also be in various other non-flat structures, such as a "few"-shaped structure, etc., and is not limited to this embodiment.

[0042] like Figures 3 to 5As shown, based on the structural design that the pressing plate 400 simultaneously constrains each cylindrical battery 200 belonging to the same battery column 201, in one embodiment of the present invention, at least two battery columns 201 are arranged into a battery group 202 along a third direction Z, and the third direction Z is perpendicular to the bottom plate 110. On this basis, for one battery group 202, the battery pack can be arranged with only one pressing plate 400, and the pressing plate 400 is located on the side of the battery column 201 belonging to the same battery group 202 that is farthest from the bottom plate 110 and faces away from the bottom plate 110. Through the above structural design, the utility model can further improve the energy density of the battery pack by using the design of forming a battery group 202 with multiple layers of battery columns 201, and on this basis, use the pressing plate 400 to only constrain the battery column 201 on the top layer to realize the constraint of the entire battery group 202. Specifically, for other battery columns 201 other than the top layer, on the basis of the top layer battery column 201 being constrained by the pressing plate 400, the constraint is realized by relying on the arrangement of adjacent battery columns 201 in the same battery group 202 in the third direction Z, which is conducive to reducing the number of parts and simplifying the complexity of the structure. In some embodiments, for battery columns 201 of different layers belonging to a battery group 202, the utility model can also set pressing plates 400 to constrain them respectively, which is not limited to this embodiment.

[0043] In one embodiment of the present invention, the partition 300 may be a heat exchange plate, which contacts and exchanges heat with the cylindrical battery 200 via the contact surface 310 (may be in direct contact or indirect contact via other structures). Through the above structural design, the present invention can utilize the partition 300 to contact and exchange heat with the cylindrical battery 200.

[0044] In one embodiment of the utility model, the partition 300 can be a metal plate or a polymer plate such as a steel plate, an aluminum plate, an aluminum alloy plate, a steel-aluminum composite plate, a copper plate, a copper alloy plate, etc. The partition 300 can be a structural reinforcement plate, which plays a role of reinforcement and / or heat insulation, or it can be a cold plate, including a temperature equalizing plate and a flow channel plate, etc., which plays a role of heat conduction.

[0045] Based on the structural design of the partition 300 as a heat exchange plate, in one embodiment of the present utility model, the contact surface 310 of the partition 300 can be a plane.

[0046] Based on the structural design that the partition 300 is a heat exchange plate, in one embodiment of the present invention, the partition 300 has a heat exchange channel, a heat exchange medium flows in the heat exchange channel, the heat exchange medium is a refrigerant, and the internal pressure of the heat exchange channel is 50kPa to 100kPa. In other words, the battery pack proposed by the present invention adopts a direct cooling heat exchange system, that is, the partition 300 is a direct cooling partition.

[0047] In one embodiment of the present invention, a glue layer may be provided between the cylindrical battery 200 and the pressure plate 400. Through the above structural design, the present invention can use the glue layer to achieve the bonding and fixation between the cylindrical battery 200 and the pressure plate 400, thereby further improving the structural rigidity of the battery pack. In some embodiments, the cylindrical battery 200 and the pressure plate 400 may also be fixedly connected in other forms, or there may be no direct connection between the cylindrical battery 200 and the pressure plate 400, which is not limited to this embodiment.

[0048] like Figure 5 As shown, in one embodiment of the present invention, a reference plane is defined, which is parallel to the bottom plate 110. On the reference plane, the orthographic projection figure of the pressing plate 400 at least partially overlaps with the orthographic projection figure of the cylindrical battery 200. Among them, along the first direction X, the length L1 of the portion of the pressing plate 400 overlapping the cylindrical battery 200 can account for 0.01 to 0.5 of the length L2 of the cylindrical battery 200, such as 0.01, 0.05, 0.1, 0.2, 0.3, 0.5, etc. Through the above structural design, the present invention can avoid the pressing plate 400 from overlapping too much on the cylindrical battery 200, thereby increasing the volume and weight of the pressing plate 400, and can also avoid the pressing plate 400 from overlapping too little on the cylindrical battery 200, thereby preventing the restraining function of the cylindrical battery 200 from being insufficiently obvious. In some embodiments, the length L1 of the portion of the pressing plate 400 overlapping the cylindrical battery 200 may account for less than 0.01 of the length L2 of the cylindrical battery 200, or may be greater than 0.5, such as 0.009, 0.51, etc., and is not limited to this embodiment.

[0049] In one embodiment of the present invention, the ratio of the length of the pressing plate 400 to its thickness can be 96 to 3000, such as 96, 200, 500, 1000, 3000, etc. Through the above structural design, the present invention can avoid the above ratio being too large so that the pressing plate 400 itself is easily broken when subjected to vibration conditions, and can also avoid the above ratio being too small so as to be unfavorable for weight reduction and Z-direction space utilization.

[0050] In one embodiment of the present invention, the thickness of the pressing plate 400 can be 0.5 mm to 4 mm, such as 0.5 mm, 1 mm, 2.5 mm, 4 mm, etc. Through the above structural design, the present invention can avoid the thickness of the pressing plate 400 being too small, resulting in insufficient restraint, and can also avoid the thickness of the pressing plate 400 being too large, resulting in excessive space occupation or excessive weight. In some embodiments, the thickness of the pressing plate 400 can also be less than 0.5 mm, or can be greater than 4 mm, such as 0.49 mm, 4.05 mm, etc., and is not limited to this embodiment.

[0051] In one embodiment of the present invention, the material of the pressing plate 400 may be a non-metallic material. Since the insulating layer at the R angle structure between the end face and the side surface 230 of the cylindrical battery 200 is relatively thin, if the pressing plate 400 is made of a metal material, the risk of insulation failure may increase. Through the above design, the present invention can reduce the risk of insulation failure. In some embodiments, the material of the pressing plate 400 may also be a metal material. In this case, an additional insulation design (different from the insulation layer on the surface of the battery) may be performed between the pressing plate 400 and the cylindrical battery 200. For example, when a glue layer is provided between the pressing plate 400 and the cylindrical battery 200, the glue layer may be made of an insulating glue material, which is not limited to this embodiment.

[0052] In one embodiment of the present invention, the first end surface 210 of the cylindrical battery 200 may be provided with an insulating layer. Through the above structural design, the present invention can ensure the insulation performance between the first end surface 210 and the separator 300 by using the insulating layer.

[0053] Based on the structural design that the first end surface 210 is provided with an insulating layer, in one embodiment of the present invention, the insulating layer may be an insulating spray layer. Through the above design, since the insulating spray layer has a greater surface roughness than insulating layers of other structural forms (such as insulating films), when the separator 300 is bonded and fixed to the cylindrical battery 200, the present invention can further improve the bonding strength between the separator 300 and the cylindrical battery 200 by utilizing the design of the insulating spray layer.

[0054] like Figure 3 and Figure 4 As shown, in one embodiment of the present invention, an explosion-proof valve may be provided on the second end surface 220 of the cylindrical battery 200. Through the above structural design, the present invention can avoid the problem that the partition 300 blocks the pressure relief valve when the explosion-proof valve is provided on the first end surface 210.

[0055] In one embodiment of the present invention, the partition 300 may be an extruded profile.

[0056] In one embodiment of the present invention, the cylindrical battery 200 may be a lithium iron battery. For example, the positive electrode active material of the cylindrical battery 200 may be lithium iron phosphate.

[0057] It should be noted that Figure 1Taking the illustrated embodiment as an example, when cylindrical batteries 200 are provided on both sides of the partition 300 in the first direction X, the partition 300 and the cylindrical batteries 200 on both sides and other related structures can together constitute a battery module, and the battery module can be arranged on the module bottom plate 1101, and arranged on the bottom plate 110 of the battery box through the module bottom plate 1101. At this time, the relative arrangement relationship between each structure and the bottom plate 110 in this specification can be correspondingly understood as the relative arrangement relationship between each structure and the module bottom plate 1101. Through the above-mentioned structural design, the utility model can improve the integration of the battery module, which is conducive to improving the assembly efficiency. It should be understood that in some embodiments, the battery pack may not be provided with a module bottom plate 1101, and the battery module may also be directly arranged on the bottom plate 110 of the battery box 100.

[0058] It should be noted that the battery packs shown in the drawings and described in this specification are only a few examples of many types of battery packs that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details of the battery packs shown in the drawings or described in this specification or any components of the battery packs.

[0059] In summary, the battery pack proposed by the present invention adopts a layout in which the cylindrical battery 200 is lying and the partition 300 is standing; the contact surface 310 of the partition 300 faces the first end surface 210 of the cylindrical battery 200, and the second end surface 220 of the cylindrical battery 200 facing away from the partition 300 is connected to the conductive bar 500. On this basis, the battery pack is provided with a pressing plate 400 on the side of the cylindrical battery 200 facing away from the bottom plate 110. On a reference plane parallel to the bottom plate 110, the orthographic projection pattern of the pressing plate 400 partially overlaps with the orthographic projection pattern of the partition 300, which is used to constrain the area adjacent to the first end surface 210 of the cylindrical battery 200. Through the above structural design, the present invention can use the pressing plate 400 to constrain the cylindrical battery 200, avoid the part of the cylindrical battery 200 adjacent to the partition 300 from warping, and optimize the mode of the battery pack in the direction perpendicular to the bottom plate 110.

[0060] The exemplary embodiments of the battery pack proposed by the utility model are described and / or illustrated in detail above. However, the embodiments of the utility model are not limited to the specific embodiments described here. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described here. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated here, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to express the meaning of open inclusion and mean that in addition to the listed elements / components / etc., there may be additional elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as marks and are not numerical restrictions on their objects.

[0061] Although the battery pack of the present invention has been described according to different specific embodiments, those skilled in the art will recognize that the implementation of the present invention can be modified within the spirit and scope of the claims.

Claims

1. A battery pack, characterized in that: include: A battery box, including a bottom plate; A cylindrical battery is arranged in the battery box, and its axial direction is a first direction parallel to the bottom plate. The cylindrical battery has a first end surface, a second end surface and a side surface. The first end surface and the second end surface are arranged at intervals in the first direction and are respectively perpendicular to the first direction. The side surface is connected between the first end surface and the second end surface. The second end surface is connected to a conductive bar, and the conductive bar is connected to the electrode output ends of two adjacent cylindrical batteries. a partition plate having a contact surface facing the first end surface and perpendicular to the bottom plate; as well as The pressing plate is arranged on the side of the cylindrical battery facing away from the bottom plate, and on a reference plane parallel to the bottom plate, the orthographic projection pattern of the pressing plate partially overlaps with the orthographic projection pattern of the partition.

2. The battery pack according to claim 1, characterized in that: At least two of the cylindrical batteries are arranged into a battery column along a second direction, the second direction is parallel to the bottom plate and parallel to the contact surface, and the first end surface of each cylindrical battery belonging to the same battery column faces a contact surface of the partition at the same time; wherein the pressure plate is long and extends along the second direction, and the pressure plate simultaneously constrains each cylindrical battery belonging to the same battery column.

3. The battery pack according to claim 2, characterized in that: The battery columns are respectively arranged on both sides of the partition in the first direction; wherein the pressing plate simultaneously constrains the two battery columns on both sides of the partition.

4. The battery pack according to claim 3, characterized in that: The pressure plate includes a connecting portion and two restraining portions, wherein the connecting portion is connected to the partition, and the two restraining portions are respectively connected to two sides of the connecting portion in the first direction, and the two restraining portions respectively restrain the two battery columns on both sides of the partition.

5. The battery pack according to claim 2, characterized in that: At least two of the battery columns are arranged into a battery group along a third direction, and the third direction is perpendicular to the bottom plate; wherein, for one battery group, the battery pack is only arranged with one pressure plate, and the pressure plate is located on the side of the battery column farthest from the bottom plate in each battery column belonging to the same battery group, facing away from the bottom plate.

6. The battery pack according to claim 1, characterized in that: The partition is a heat exchange plate.

7. The battery pack according to claim 6, characterized in that: The contact surface of the separator is a plane.

8. The battery pack according to claim 6, characterized in that: The partition plate has a heat exchange channel in it, a heat exchange medium flows in the heat exchange channel, the heat exchange medium is a refrigerant, and the internal pressure of the heat exchange channel is 50 kPa to 100 kPa.

9. The battery pack according to claim 1, characterized in that: A reference plane is defined, the reference plane is parallel to the base plate, on the reference plane, the orthographic projection pattern of the pressure plate at least partially overlaps with the orthographic projection pattern of the cylindrical battery, and along the first direction, the length of the portion of the pressure plate overlapping the cylindrical battery accounts for 0.01 to 0.5 of the length of the cylindrical battery.

10. The battery pack according to claim 1, characterized in that: The ratio of the length of the pressing plate to its thickness is 96 to 3000; and / or The thickness of the pressing plate is 0.5 mm to 4 mm.

11. The battery pack according to any one of claims 1 to 10, characterized in that: The second end surface of the cylindrical battery is provided with an explosion-proof valve.

12. The battery pack according to any one of claims 1 to 10, characterized in that: The cylindrical battery is a lithium iron phosphate battery.

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