Battery Modules and Electronic Devices

Abstract

To provide a battery module with stable performance and an electronic apparatus including the battery module.SOLUTION: A battery module includes a case 1 and cells 2. Inside the case, the cells are stacked in a thickness direction. The case includes a bottom plate 11, an upper cover 12, and side walls. The side walls are formed by surrounding a plurality of side plates 13. The side plates include at least one movable plate 13a capable of sliding along the stacking direction of the cells. When the cells expand, the expansion power and expansion amount of the cells push the outermost cell so that the cell move in the stacking direction. As the cells expand, the movable plate is pushed to slide and the expansion power applied to the movable plate is reduced. Thus, the expansion power applied on the movable plate in the expansion direction of the cells can be reduced effectively and the safety of the battery module can be drastically improved.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of batteries, and in particular to a battery module and an electronic device. [Background technology]

[0002] As the core of the three major technologies of new energy vehicles, power batteries have attracted more and more attention. Safety is an important technical aspect for batteries. As a characteristic of the materials of power batteries, whether in normal charging and discharging state or after thermal runaway or aging, gas will be generated in the cells of the battery core, causing the cells to expand, which will cause deformation of other structures in the power battery device, thereby causing various safety risks. In order to solve such problems, the popularization of all-solid-state batteries is being actively promoted. Summary of the Invention [Problem to be solved by the invention]

[0003] Although the safety of the battery device is greatly improved by not using liquid, in the case of solid-state batteries, the expansion amount and expansion force of the cells of the module are still very large, and cell expansion is still unavoidable. When the cells heat up and expand, the expansion of the inner cells is all transferred to and accumulated in the outermost cells in the module, and the accumulated expansion amount generates a large thrust on the side plate of the module. The conventional side plate structure has difficulty in completely withstanding such thrust, and therefore the side plate may easily deform, crack or break.

[0004] Therefore, there is an urgent need for a battery module that can solve the above problems. [Means for solving the problem]

[0005] To achieve the above objectives, the following technical solutions are provided:

[0006] In a first aspect, there is provided a battery module comprising:

[0007] The case includes a bottom plate, a top cover, and a side wall.

[0008] Within the case, a plurality of cells are stacked along the thickness direction of the case.

[0009] The side wall is formed by surrounding a plurality of side plates, and the side plates include at least one movable plate that is slidable along the stacking direction of the cells.

[0010] As another technical solution of the battery module, the battery module further includes a cable tie, which is arranged to be at least elastically attached to an outer surface of the movable plate and to a portion of two side plates adjacent to the left and right of the movable plate.

[0011] As another technical solution of the battery module, a cable tie is provided with a connecting portion at each end, and the connecting portions of the cable ties are connected and / or fixed to two adjacent side plates on the left and right sides of the movable plate, two by two.

[0012] As another technical solution of the battery module, the two side plates adjacent to the left and right of the movable plate are fixed plates, which are fixedly connected to the bottom plate and the top cover.

[0013] In another technical solution of the battery module, the fixing plate is provided with an undercut for a cable tie to pass through, and the cable tie slides in the undercut as the cable tie is deformed and / or displaced.

[0014] As another technical solution for the battery module, the fixing plate is provided with a recess for embedding the connection part.

[0015] As another technical solution of the battery module, the plurality of cable ties include a first cable tie and a second cable tie, and a first connection portion of the first cable tie is elastically connected to a second connection portion of the second cable tie.

[0016] As another technical solution of the battery module, the first connection part includes a body and an elastic member, and the second connection part includes a fixing part and a limiting guide member. The limiting guide member is connected to the fixing part, and the limiting guide member is slidably disposed on the body along the stacking direction of the cells, and both ends of the elastic member are respectively connected to the body and the limiting guide member.

[0017] As another technical solution of the battery module, the body is provided with a receiving groove extending along the stacking direction of the cells. Two opposing groove walls of the receiving groove are both provided with a limiting guide groove extending along the stacking direction of the cells. The elastic member is received in the receiving groove. Two ends of the limiting guide member are respectively slidably fitted into the limiting guide grooves on the two groove walls of the receiving groove.

[0018] In another technical solution of the battery module, the elastic member is stretched and connected between the body and the limiting guide member.

[0019] As another technical solution of the battery module, one end of the elastic member is connected to a side wall of the receiving groove spaced apart from the second cable tie, and the other end of the elastic member is connected to the limiting guide member.

[0020] In another technical solution of the battery module, the elastic member is compressed and connected between the body and the limiting guide member.

[0021] As another technical solution of the battery module, the second connection part further includes a connection member, the connection member being connected between the fixing part and the limiting guide member, one end of the elastic member being connected to the side wall of the receiving groove on the second cable tie side, and the other end of the elastic member being connected to the limiting guide member.

[0022] As another technical solution of the battery module, the case further comprises a sliding track and a sliding groove, the sliding groove being disposed on the movable plate, and the sliding track being disposed on the bottom plate and / or the top cover.

[0023] As another technical solution of the battery module, the sliding track is a strip-shaped protrusion extending along the stacking direction of the cells, and the sliding groove is a notch structure that matches the strip-shaped protrusion of the sliding track.

[0024] Another technical solution of the battery module is that the extension length of the sliding track is equal to or greater than the expansion amount of the cell in the thickness direction.

[0025] Another technical solution of the battery module is that, when the width of the bottom plate is L and the length of the sliding track is x, x / L<0.15.

[0026] In a second aspect, an electronic device is provided that includes a battery module.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] The battery module provided by the present invention comprises a case and cells. The cells are stacked in the case. The case comprises a bottom plate, an upper cover, and a side wall. The side wall is formed by sandwiching the side plate. The side plate comprises at least one movable plate that can slide along the stacking direction of the cells. When the cells expand, the expanded cell pushes and moves the adjacent cells due to the increase in its volume. After the displacement is transmitted to the outermost cell, the pushed outermost cell finally exerts an outward pressing force on the side wall. Since at least one side wall of the present invention is a movable plate, the movable plate can slide outward along the stacking direction of the cells after receiving the pressing force from the cells, which eliminates the rigidity stress that the side wall needs to bear, reduces the risk of component damage due to hard pressing, and greatly improves the safety of the battery module. Effect of the Invention

[0029] In the electronic device provided by the present invention, by applying a battery module, the performance of the battery module is stabilized and the safety of the electronic device is improved. [Brief description of the drawings]

[0030] [Figure 1] 1 is an exploded schematic view of a battery module according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a schematic structural diagram of a slide track and a slide groove according to an embodiment of the present invention; [Diagram 3] FIG. 2 is a schematic structural diagram of a battery module before cells expand according to an embodiment of the present invention; [Figure 4] FIG. 2 is a schematic structural diagram of a battery module after a cell is expanded according to an embodiment of the present invention. [Diagram 5] FIG. 5 is an enlarged view of A in FIG. [Figure 6] 1 is a schematic structural diagram of a first cable tie according to an embodiment of the present invention; FIG. [Figure 7] FIG. 2 is a schematic structural diagram of a second cable tie according to one embodiment of the present invention. [Figure 8] FIG. 8 is an enlarged view of B in FIG. [Figure 9] FIG. 11 is a schematic structural diagram of a third cable tie according to an embodiment of the present invention. [Figure 10] FIG. 10 is an enlarged view of C in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are described clearly and completely below with reference to the drawings of the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described in this specification and illustrated in the drawings can be arranged and designed in a variety of different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the protection scope of the present invention, but is only representative of selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0033] It should be noted that like numerals and wording refer to like items in the following drawings, so that if an item is defined in a drawing, that item need not be further defined and explained in the subsequent drawings.

[0034] In the description of the present invention, terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate directions or positions and are based on the directions or positions shown in the drawings or the conventional arrangement or position of the product of the present disclosure when used. These terms do not indicate or imply that the referenced device or component must have a particular orientation or must be configured and operated in a particular orientation, but are used solely for the convenience of describing and simplifying the description of the present invention. Thus, the above terms should not be construed as limiting the invention. Furthermore, terms such as "first", "second", and "third" are used only to distinguish the description and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0035] In the description of the present invention, it should be noted that the terms "configuration" and "connection" should be understood in a broad sense unless otherwise specified and limited. For example, the connection may be a fixed connection, a detachable connection, an integral connection, or a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in the present invention in a specific context.

[0036] In the present invention, unless expressly specified and limited otherwise, a first feature being "above" or "below" a second feature may include direct contact between the first feature and the second feature, or may include contact between the first feature and the second feature that is not in direct contact but is instead contacted via another feature between them. Additionally, a first feature being "above," "above," and "on the top" of a second feature refers to the first feature being directly above and diagonally above the second feature, or simply that the first feature is horizontally higher than the second feature. A first feature being "below," "below," and "on the bottom" of a second feature refers to the first feature being directly below and diagonally below the second feature, or simply that the first feature is horizontally lower than the second feature.

[0037] Hereinafter, the embodiments of the present invention will be described in detail, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals refer to the same or similar components, or components having the same or similar features throughout. The embodiments described below with reference to the drawings are exemplary and are used solely to explain the present invention, and should not be construed as limitations on the present invention.

[0038] FIG. 1 is a diagram showing a basic structure of a battery module according to an embodiment of the present invention. As shown in FIG. 1, the battery module according to the embodiment of the present invention has a case 1. The case 1 includes a bottom plate 11, an upper cover 12, and a side wall. The side wall is formed by surrounding a plurality of side plates 13. As shown in FIG. 1, in this embodiment, the side plates 13 are four sheets to form a rectangular box shape. Those skilled in the art can adjust the number and size of the side plates 13 according to the actual situation. A plurality of cells 2 are arranged inside the case 1. The cells 2 are approximately rectangular packages and are arranged in contact with the substrate 11 in the thickness direction. The cells 2 are stacked in the case 1 along the thickness direction. The side plate 13 includes at least one movable plate 13a that can slide along the stacking direction of the cells 2. When the cells 2 expand, the pressing force due to the expansion of the cells 2 pushes the outermost cell 2 and moves in the stacking direction, and the movable plate 13a is also pushed and slides through the outermost cell 2 according to the expansion amount of the cells 2. The thrust generated by the expansion of the cells is converted into the sliding kinetic energy of the movable plate 13a, reducing the rigidity thrust that the movable plate 13a needs to bear, and greatly improving the safety of the battery module.

[0039] In the above embodiment of the present invention, the two side plates 13 adjacent to the left and right of the movable plate 13a are fixed plates 13b, and the fixed plates 13b are connected and fixed to the bottom plate 11 and the upper cover 12. The two fixed plates 13b are perpendicular to the length direction of the cells 2 (not shown), and the two movable plates 13a are arranged in the stacking direction of the cells 2, and both of the two movable plates 13a can slide outward along the stacking direction of the cells 2. However, in other embodiments, as long as at least one side plate 13 can slide along the stacking direction of the cells 2, only one movable plate 13a may slide, or all of the side plates 13 may be set to be movable. Further examples will be omitted here.

[0040] The movable plate 13a is also provided with a slide groove 15, and the bottom plate 11 is provided with a slide track 14 corresponding to the sliding range of one end of the movable plate 13a, the upper cover 12, and the fixed plate 13b. Due to the matching structure between the slide track 14 and the slide groove 15, the movable plate 13a can be displaced along the cell expansion direction while always remaining perpendicular to the adjacent fixed plate 13b without lateral displacement or distortion, and the structural integrity of the case 1 of the battery module can be maintained.

[0041] In addition, a cable tie 3 is disposed on the outer periphery of the side wall. At least a part of the cable tie 3 is made of an elastic material. The purpose of disposing the cable tie 3 is to prevent the movable plate 13a from continuing to be displaced outward by applying an elastic force to the movable plate 13a in the opposite direction to the sliding direction by utilizing the properties of the elastic material when the movable plate 13a slides outward due to the thrust of the expansion of the cells 2, thereby preventing the movable plate 13a from falling off, thereby maintaining the structural stability of the battery module.

[0042] The structure of the slide groove 15, the slide track 14 and the cable tie 3 will be described in further detail below.

[0043] As shown in FIG. 2, the bottom plate 11, the upper cover 12, and the fixed plate 13b all have slide tracks 14, and the outer periphery of the movable plate 13a has a corresponding slide groove 15. In another embodiment, the slide track 14 may be disposed at one or more positions of the bottom plate 11, the upper cover 12, or the fixed plate 13b, and the slide groove 15 may be disposed only at the corresponding position of the movable plate 13a. The slide track 14 is a strip-shaped protrusion extending along the stacking direction of the cells 2, and the slide groove 15 is a notch structure that matches the strip-shaped protrusion of the slide track 14. Such a design is convenient for machining the slide track 14 and the slide groove 15 while minimizing the increase in the amount of material used for the case 1 and realizing the weight reduction of the case 1. Obviously, the slide track can be set to a recess, and the slide groove 15 can be set to a protrusion correspondingly.

[0044] To prevent the movable plate 13a from separating from the fixed plate 13b, the extension length of the slide track 14 must be equal to or greater than the amount of expansion in the thickness direction of the cells 2. Specifically, the length of the slide track 14 is preferably the difference between the thickness of the fully expanded cell stack and the thickness in the initial state. At the same time, the compression rate of the buffer material disposed inside the module and between the cells 2 must also be taken into consideration. The design length of the slide track 14 can be simply expressed by the following formula (1). x=nRT cell -△CT buffer (1) x is the length of the slide track 14, n is the number of cells 2, R is the expansion rate of cell 2, T cell is the thickness of a single cell 2, T buffer is the thickness of the buffer material in the module, and ΔC is the change in compressibility of the buffer material before and after the expansion of cell 2.

[0045] Preferably, the width of the base plate 11 is the final width after the expansion of the cell 2, which can further ensure that the movable plate 13a does not slide off the slide track 14. When the width of the base plate 11 is L and the length of the slide track 14 is x, x / L<0.15.

[0046] As shown in Fig. 2, an escape groove 131 is further provided at the end of the fixed plate 13b. At least a portion of the escape groove 131 close to the end of the fixed plate 13b is a rectangular opening penetrating the fixed plate 13b, and its width allows the cable tie 3 to pass through. The fixed plate 13b may be provided with a recess 132 that does not penetrate the plate, and its width also matches that of the cable tie 3. Both the recess 132 and the escape groove 131 extend along the length of the fixed plate 13b. Although Fig. 2 shows the state in which the two are connected along the length at the end of the fixed plate 13b, the two may be arranged with a gap between them.

[0047] FIG. 3 shows a schematic structural diagram of a battery module before expansion according to an embodiment of the present invention. FIG. 4 shows a schematic structural diagram of a battery module after expansion according to an embodiment of the present invention. As shown in FIG. 3, before the cells 2 of the module expand, the cells 2 in the module are compactly arranged, and the overall volume is small. The movable plate 13a is embedded inside the case 1 of the battery module to match the compact volume, and the upper cover 12, the lower plate, and the end of the fixed plate 13b, more specifically, a part of the parts constituting a part of the slide track 14, do not contact the movable plate 13a and are exposed outside the space of the module. In this state, the escape groove 131 arranged at the end of the fixed plate 13b is also located outside the case 1 formed by surrounding the current movable plate 13a. The cable tie 3 arranged on the outer periphery of the side wall of the battery module passes through the escape groove 131 to fix the fixed plate 13b and the movable plate 13a vertically relative to each other.

[0048] As shown in Fig. 4, when the cell 2 of the module expands, the movable plate 13a is pushed from the inside to the outside under the action of the expansion force of the cell 2, and slides along the slide track 14. In addition, the cable tie 3 is pulled, generating an elastic force in the movable plate 13a in the opposite direction to the sliding direction, preventing the movable plate 13a from continuing to slide. The maximum elastic force of the cable tie 3 is set so that the movable plate 13a will eventually align and abut against the ends of the upper cover 12 and the bottom plate 11, and will not fall off the slide track 14.

[0049] 5 and 6 show a first example of the basic structure of the cable tie 3. As shown in FIG. 5 and FIG. 6, the cable tie 3 is formed by joining multiple components of a rope-like part, and both ends of each cable tie 3 are provided with a connection part 31. The connection parts 31 are connected in pairs to combine multiple parts of the cable tie 3 in a ring shape, surrounding the outer circumferential side of the side wall, so that the movable plate 13a slides within the length of the slide track 14 along the thickness direction of the cell 2 relative to the fixed plate 13b. For example, as shown in FIG. 6, the cable tie 3 includes a first cable tie 4 and a second cable tie 5. The two ends of the first cable tie 4 are provided with a first connection part 40, and the two ends of the second cable tie 5 are provided with a second connection part 50. The two first cable ties 4 and the two second cable ties 5 are alternately connected to surround the outer circumferential side of the side wall. Here, the second cable tie 5 attached to the movable plate 13a has a certain elasticity, but the first cable tie 4 not attached to the movable plate 13a may have the same elasticity as the second cable tie 5, a lower elasticity, or no elasticity. In another embodiment, the cable tie 3 may be a ring-shaped elastic member without a connecting part and directly surround the outer circumferential side of the side wall of the case 1. In another embodiment, the cable tie 3 may be a cord having two free ends instead of forming a ring. The long, tie-shaped cable tie 3 is elastically attached only to the outer surface of the movable plate 13a, and the connecting parts 31 at both ends are fixed to two side plates 13 adjacent to the left and right of the movable plate 13a (two fixed plates 13b in this embodiment). In other words, the following technical effects of the present invention are achieved as long as the cable tie 3 is arranged so as to be at least elastically attached to a part of the outer surface of the movable plate 13a and two side plates 13 adjacent to the left and right of the movable plate 13a. The technical effects are as follows. When the cell 2 is not expanded, a positioning support force is generated in the movable plate 13a, and when the movable plate 13a is displaced, a restraining force is generated to prevent continuous sliding, so that the movable plate 13a finally comes into secure contact with the upper cover 12, the bottom plate 11 and other side walls to prevent it from sliding down.

[0050] When the cable tie 3 includes a connection portion 31, the connection portion 31 of the cable tie 3 is preferably clamped in the recess 132. Since the thickness of the connection portion 31 is greater than that of the cable tie 3, by clamping the connection portion 31 in the recess 132, the cable tie 3 can be evenly attached to the side wall, and the fastening effect of the cable tie can be ensured. In addition, by clamping the connection portion 31 in the recess 132, a part of the cable tie 3 close to the connection portion 31 can also be held in the recess 132, which can play a role in positioning the cable tie 3, preventing the displacement of the cable tie 3 due to the transfer of elastic force during the extension or contraction process, and ensuring the integrity of the case 1 of the battery module.

[0051] 7 and 8 show a second example of the basic structure of the cable tie 3. As shown in FIG. 7 and FIG. 8, the cable tie 3 includes a first cable tie 4 and a second cable tie 5. The first cable tie 4 is provided with a first connection portion 40 at both ends, and the second cable tie 5 is provided with a second connection portion 50 at both ends. Two first cable ties 4 and two second cable ties 5 are alternately connected to surround the outer periphery of the side wall. In another embodiment, the number of the first cable ties 4 and the second cable ties 5 in the cable tie 3 is at least two, and the first cable ties 4 and the second cable ties 5 are alternately connected to surround the outer periphery of the side wall. The first connection portion 40 of the first cable tie 4 is elastically connected to the second connection portion 50 of the second cable tie 5. When the cell 2 is not expanded, the first cable tie 4 and the second cable tie 5 can generate a supporting force for positioning on the movable plate 13a. When the cell 2 expands and the movable plate 13a moves, the first cable tie 4 and the second cable tie 5 apply a restraining force to the movable plate 13a to prevent it from continuing to slide, so that the movable plate 13a eventually abuts firmly against the upper cover 12, the bottom plate 11, and other side walls, preventing it from sliding off.

[0052] As shown in FIG. 8, the first connection part 40 includes a main body 41 and an elastic member 42. The main body 41 is a rectangular block structure, and the main body 41 is provided with an accommodation groove 411 extending along the stacking direction of the cells 2. Two opposing groove walls of the accommodation groove 411 are provided with a restriction guide groove 412 extending along the stacking direction of the cells 2. As shown in FIG. 8, the restriction guide groove 412 is disposed on the two opposing groove walls of the accommodation groove 411. The second connection part 50 includes a fixing part 51 and a restriction guide member 52. The restriction guide member 52 is connected to the fixing part 51, and the restriction guide member 52 is disposed on the main body 41 so as to be slidable along the stacking direction of the cells 2. Two ends of the elastic member 42 are connected to the main body 41 and the restriction guide member 52, respectively, thereby realizing an elastic connection between the first connection part 40 and the second connection part 50. As shown in FIG. 8, the fixing portion 51 is integrally formed at the end of the second cable tie 5 and has a connection structure with the mounting hole. The axis of the mounting hole of the fixing portion 511 is aligned vertically. The limit guide member 52 is inserted into the mounting hole of the fixing portion 51, and both ends of the limit guide member 52 slidably fit into two limit guide grooves 412 arranged above and below. The elastic member 42 is extended and connected between the main body 41 and the limit guide member 52. The elastic member 42 is accommodated in the accommodation groove 411, and one end of the elastic member 42 is connected to a side wall of the accommodation groove 411 that is spaced apart from the second cable tie, and the other end of the elastic member 42 is connected to the limit guide member 52. Furthermore, the multiple elastic members 42 are arranged in parallel at intervals along the extension direction of the limiting guide member 52, that is, the main body 41 and the limiting guide member 52 are elastically connected through the elastic members 42 arranged in parallel, thereby ensuring the pre-tightening force of the cable tie 3 to the movable plate 13a, and after the expansion force of the cell 2 disappears, the cable tie 3 drives the movable plate 13a to smoothly return to its original position, thereby maintaining the overall pre-tightening of the cell 2.

[0053] In the above embodiment, the connection between the elastic member 42 and the main body 41 can be made in the following manner. A hook is provided on the side wall of the receiving groove 411 of the main body 41, which is away from the second cable tie 5, and the hanging hole structure at the end of the elastic member 42 is hooked onto the hook. The connection between the elastic member 42 and the limit guide member 52 can be made in the following manner. The hanging hole structure at the end of the elastic member 42 is aligned with the mounting hole of the fixed part 51, and the limit guide member 52 passes through the mounting hole of the fixed part 51 and the hanging hole structure of the elastic member 42 in sequence, and the limit guide member 52 is finally attached so as to match with the limit guide groove 412. In addition, in order to prevent the limit guide member 52 from coming off the limit guide groove 412, after the limit guide member 52 is aligned and attached to the limit guide groove 412, a limit block can be added to both ends of the limit guide member 52, or both ends of the limit guide member 52 can be riveted to form a limit block. The configuration method of the limit block is not limited to the above two examples, and will not be described one by one here.

[0054] 9 and 10 show a third example of the basic structure of the cable tie 3. As shown in FIG. 9 and FIG. 10, the cable tie 3 includes a first cable tie 4 and a second cable tie 5. The first cable tie 4 is provided with a first connection portion 40 at both ends, and the second cable tie 5 is provided with a second connection portion 50 at both ends. Two first cable ties 4 and two second cable ties 5 are alternately connected to surround the outer periphery of the side wall. In another embodiment, the number of the first cable ties 4 and the second cable ties 5 in the cable tie 3 is at least two, and the first cable ties 4 and the second cable ties 5 are alternately connected to surround the outer periphery of the side wall. The first connection portion 40 of the first cable tie 4 is elastically connected to the second connection portion 50 of the second cable tie 5. When the cell 2 is not expanded, the first cable tie 4 and the second cable tie 5 can generate a supporting force for positioning on the movable plate 13a. When the cell 2 expands and moves the movable plate 13a, the first cable tie 4 and the second cable tie 5 apply a restraining force to the movable plate 13a to prevent continued sliding, and ultimately ensure that the movable plate 13a abuts firmly against the upper cover 12, the bottom plate 11, and other side walls to prevent it from sliding off.

[0055] 10, the first connection part 40 includes a main body 41 and an elastic member 42. The main body 41 is a rectangular block structure, and the main body 41 is provided with an accommodation groove 411 extending along the stacking direction of the cells 2. Two opposing groove walls of the accommodation groove 411 are provided with limit guide grooves 412 extending along the stacking direction of the cells 2. As shown in FIG. 10, the limit guide grooves 412 are disposed on the two opposing groove walls of the accommodation groove 411. The second connection part 50 includes a fixing part 51, a limit guide member 52, and a connecting member 53. The fixing part 51 is connected to the tie-shaped part of the second cable tie 5. One end of the connecting member 53 is connected to the fixing part 51, and the other end is connected to the limit guide member 52. The limit guide member 52 is slidably disposed on the main body 41 along the stacking direction of the cells 2. The two ends of the elastic member 42 are connected to the main body 41 and the limiting guide member 52, respectively, thereby realizing an elastic connection between the first connecting portion 40 and the second connecting portion 50. As shown in FIG. 10, the fixing portion 51 is integrally formed at the end of the second cable tie 5 and has a connection structure with the mounting hole. The hole axis of the mounting hole of the fixing portion 511 extends along a direction perpendicular to the surface on which the cable tie 3 exists. One end of the connecting member 53 is hooked onto the mounting hole of the fixing portion 51, and the other end is connected and fixed to the limiting guide member 52. The elastic member 42 is compressed and connected between the main body 41 and the limiting guide member 52. The elastic member 42 is accommodated in the limiting guide groove 412, and one end of the elastic member 42 is connected to the side wall of the limiting guide groove 412 close to the second cable tie 5, and the other end of the elastic member 42 is connected to the limiting guide member 52. At least one elastic member 42 is disposed in each limiting guide groove 412, the elastic member 42 is compressed, and the elastic force of the elastic member 42 against the limiting guide member 52 enables the second cable tie 5 to generate a pre-clamping force against the movable plate 13a. When the cell 2 expands and pushes the movable plate 13a to move, the elastic member 42 is further compressed. After the expansion force of the cell 2 disappears, the first cable tie 4 and the second cable tie 5 can contract under the action of the elastic member 42, thereby returning the movable plate 13a to its original position and maintaining the overall pre-clamping of the cell 2.

[0056] The connection between the elastic member 42 and the main body 41 can adopt the following method. A hook or a limiting groove is provided on the side wall of the limiting guide groove 412 of the main body 41 close to the second cable tie 5, and the hanging hole structure of the end of the elastic member 42 is hooked onto the hook or the end of the elastic member 42 is received in the limiting groove. The connection between the elastic member 42 and the limiting guide member 52 can adopt the following method. The limiting guide member 52 passes through the hanging hole structure of the elastic member 42. In addition, in order to prevent the limiting guide member 52 from coming off the limiting guide groove 412, After the limit guide member 52 is aligned with and installed in the limit guide groove 412, limit blocks can be added to both ends of the limit guide member 52, or both ends of the limit guide member 52 can be riveted together to form limit blocks. The configuration methods of the limit blocks are not limited to the above two examples, and will not be described one by one here.

[0057] This embodiment also provides an electronic device (not shown) equipped with the battery module. Through the electronic device using the battery module, the expansion force of the cells 2 on the side plate 13 can be effectively reduced, thereby improving the safety of the battery module and preventing damage to the side plate 13 caused by the expansion of the cells 2, thereby ensuring the safety of the electronic device.

[0058] The electronic device may be an electric vehicle or other device that can be equipped with a battery module according to an embodiment of the present invention.

[0059] It should be noted that the above is merely the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art should understand that the present invention is not limited to the specific embodiment described herein, and various obvious modifications, rearrangements, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the appended claims. [Industrial Applicability]

[0060] The present invention provides a battery module which can reduce the expansion force of the cells on the side plates to improve the safety of the battery module.

[0061] The present invention provides an electronic device that uses a battery module, and thereby the performance of the battery module is stabilized and the safety of the electronic device is improved. [Explanation of symbols]

[0062] 1 case 11 Bottom plate 12 Top cover 13 Side Panel 13a Movable plate 13b Fixed plate 131 Undercut 132 Recess 14 Slide track 15 Slide groove 2 Cell 3 Cable ties 31 Connection 4. First Cable Tie 40 First connection part 41 Main unit 411 Storage Groove 412 Restriction guide groove 42 Elastic member 5 Second Cable Tie 50 Second connection 51 Fixed part 52 Restriction guide member 53 Connection parts

Claims

1. a case having a bottom plate, a top cover, and a side wall; A plurality of cells stacked in the thickness direction within the case; A cable tie, The side wall is formed by surrounding a plurality of side plates, and the side plates include at least one movable plate that is slidable along a stacking direction of the cells; The two side plates adjacent to the left and right of the movable plate are fixed plates, and the fixed plates are fixedly connected to the bottom plate and the upper cover; A battery module, wherein each of the fixing plates has an escape groove which is a rectangular opening for passing the cable tie therethrough, the cable tie slides within the escape groove as the cable tie is deformed and / or displaced, and the rectangular opening is disposed at an end of the fixing plate and penetrates the fixing plate.

2. A battery module as described in claim 1, wherein the cable tie is positioned so as to be at least elastically attached to the outer surface of the movable plate and to portions of two side plates adjacent to the left and right of the movable plate.

3. A battery module as described in claim 2, wherein connection portions are provided on both ends of the cable tie, and the connection portions of the multiple cable ties are connected and / or fixed, two by two, to two side plates adjacent to the left and right of the movable plate.

4. The battery module according to claim 1 , wherein the fixing plate is provided with a recess for embedding the connection portion.

5. The battery module according to claim 1 , wherein the case further comprises a slide track and a slide groove, the slide groove being disposed on the movable plate, and the slide track being disposed on the bottom plate and / or the upper cover.

6. 6. The battery module according to claim 5, wherein the slide track is a strip-shaped protrusion extending along a stacking direction of the cells, and the slide groove is a notch structure that matches the strip-shaped protrusion of the slide track.

7. The battery module according to claim 5 , wherein an extension length of the slide track is equal to or greater than an expansion amount of the cell in a thickness direction.

8. The battery module according to claim 5 , wherein, when the width of the bottom plate is L and the length of the slide track is x, x / L<0.

15.

9. An electronic device comprising the battery module according to any one of claims 1 to 8.

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