Battery Pack

Abstract

The present invention discloses a battery pack, comprising at least two battery modules, at least two of which are stacked in the height direction and / or width direction of the battery modules, at least one end of the battery modules in the length direction is provided with an end plate, the end plate is provided with a fixing portion, and the fixing portions on the end plates of two adjacent battery modules at the same end in the length direction are fixedly connected. The battery pack according to the embodiment of the present invention has a simple structure, does not need to be provided with a complex connection bracket, simplifies the installation structure, reduces the number of mounting parts, reduces the installation cost, and is conducive to improving the connection efficiency, and does not occupy too much additional installation space, which is conducive to improving the overall energy density of the battery module.

Description

Technical Field

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

[0002] With the optimization of cost of energy storage system, reducing battery pack structural parts, especially reducing battery cases and battery covers, has become an effective measure to reduce costs. In the prior art, the previous layer of battery modules corresponds to a battery case and a battery cover (i.e. a set of sealing devices), but the battery modules are arranged in multiple layers, and the multi-layer battery modules share a battery case and a battery cover, that is, the multi-layer battery modules share a set of sealing devices. In the related art, when connecting and fixing the multi-layer battery modules, it is necessary to set up a complex connection structure. Not only is the installation process more complicated, but also more structural parts are required, the design cost is high, and the complex connection structure will take up too much space in the length direction of the battery pack, which is not conducive to improving the energy density of the battery pack. There is room for improvement. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery pack that can achieve quick connection between two layers of battery modules, has a simple structure, low installation cost, and is conducive to improving the energy density of the battery pack.

[0004] A battery pack according to an embodiment of the present invention comprises: at least two battery modules, at least two of the battery modules are stacked along the height direction and / or width direction of the battery modules, at least one end of the battery module in the length direction is provided with an end plate, the end plate is provided with a fixing portion, and the fixing portions on the end plates at the same end of two adjacent battery modules in the length direction are fixedly connected.

[0005] Therefore, when connecting and fixing two battery modules, it is only necessary to connect the fixing parts of the two end plates of the battery modules. The structure is simple, and there is no need to set up a complex connection bracket, which simplifies the installation structure, reduces the number of mounting parts, reduces the installation cost, and helps to improve the connection efficiency. In this way, the battery pack of the present invention is conducive to improving the installation efficiency of the battery module, especially when the number and number of layers of the battery modules are even numbers, this structure is more suitable, so that more battery modules can be installed, and the connection through the fixing part will not occupy too much additional installation space, which is conducive to improving the overall energy density of the battery module.

[0006] According to some embodiments of the present invention, the battery pack further includes a connecting member, wherein the fixing portion of the end plate of one of the two adjacent battery modules is provided with a first connecting hole and the fixing portion of the other end plate is provided with a second connecting hole, and the connecting member is passed through the first fixing portion and the second fixing portion of the first connecting hole and the second connecting hole.

[0007] According to the battery pack of some embodiments of the present invention, the first connecting hole is configured as a through hole, the second connecting hole is configured as a blind hole and has an internal thread, the connecting member is configured as a bolt, and the connecting member passes through the first connecting hole and extends into the second connecting hole to cooperate with the internal thread.

[0008] According to some embodiments of the battery pack of the present invention, the end plates of two adjacent battery modules are suitable for being distributed in sequence in the first direction, and the axis of the second connecting hole is perpendicular to the end plates.

[0009] According to some embodiments of the battery pack of the present invention, the first fixing portion and the second fixing portion of the end plate of one of the two adjacent battery modules are provided with a limiting protrusion and the fixing portion of the other end plate is provided with a limiting recess, and the limiting protrusion extends into the limiting recess for snap-fitting.

[0010] According to the battery pack of some embodiments of the present invention, the limiting protrusion is fitted with the limiting recess to form a pressing contact surface and a limiting contact surface, and an angle is formed between the pressing contact surface and the limiting contact surface.

[0011] According to some embodiments of the battery pack of the present invention, the end plates of two adjacent battery modules are suitable for being distributed sequentially in a first direction, the angle between the limiting contact surface and the first direction is less than 45°, and the angle between the limiting contact surface and the pressing contact surface ranges from 90° to 175.

[0012] According to the battery pack of some embodiments of the present invention, one of two adjacent battery modules is a first battery module and the other is a second battery module, the first battery module is provided with a first end plate, the first end plate is provided with a first fixing portion, the second battery module is provided with a second end plate, and the second end plate is provided with a second fixing portion, and the first fixing portion and the second fixing portion are fixedly connected; wherein the first fixing portion is configured to protrude on a side of the first end plate away from the first battery module, and the second fixing portion is configured to protrude on a side of the second end plate away from the second battery module.

[0013] According to the battery pack of some embodiments of the present invention, the first end plate and the second end plate are suitable to be distributed in sequence in the up and down directions, and the first fixing portion is arranged at the lower edge of the first end plate, and the second fixing portion is arranged at the upper edge of the second end plate.

[0014] According to the battery pack of some embodiments of the present invention, the fixing portions of the end plates of two adjacent battery modules are connected by a connecting piece and fixed by clamping and limiting.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Cross-sectional view at AA in the middle;

[0019] Figure 3 yes Figure 2 Enlarged view of point C in the middle;

[0020] Figure 4 yes Figure 1 Cross-section at the middle BB;

[0021] Figure 5 yes Figure 4 The enlarged view of point D in the middle;

[0022] Figure 6 is a three-dimensional diagram of a battery pack according to an embodiment of the present invention;

[0023] Figure 7 is a schematic structural diagram of a second end plate according to an embodiment of the present invention;

[0024] Figure 8 yes Figure 7 Cross-section at EE;

[0025] Fig. 9 yes Figure 7 Cross-sectional view at FF;

[0026] Fig.10 is a perspective view of a second end plate according to an embodiment of the present invention;

[0027] Fig.11 is a schematic structural diagram of a first end plate according to an embodiment of the present invention;

[0028] Fig.12 yes Fig.11 Cross-section at GG in the middle;

[0029] Fig.13 yes Fig.11 Cross-sectional view at HH in the middle;

[0030] Fig.14 is a perspective view of a first end plate according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] Battery Pack 1000,

[0033] first end plate 1, first fixing portion 11, first connecting hole 111, limiting recess 112, inner upper wall surface 113, inner right wall surface 114, second end plate 2, second fixing portion 21, second connecting hole 211, limiting protrusion 212, outer upper wall surface 213, outer right wall surface 214, connecting member 3, pressing contact surface 41, limiting contact surface 42,

[0034] A first battery module 201 and a second battery module 202 . DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Reference below Figure 1-Figure 14A battery pack 1000 according to an embodiment of the present invention is described, comprising: at least two battery modules. The at least two battery modules are stacked along the height direction and / or width direction of the battery module, at least one end of the battery module in the length direction is provided with an end plate, and the end plate is provided with a fixing portion, and the fixing portions on the end plates of two adjacent battery modules at the same end in the length direction are fixedly connected.

[0039] like Figure 2 and Figure 4 As shown, two adjacent battery modules can be stacked in sequence along the height direction of the battery modules, and the ends of the two battery modules are provided with end plates. Therefore, when connecting two adjacent battery modules, the end plates of the two battery modules can be connected and fixed at the fixing part, such as the two can be connected and fixed by a connecting piece, or by a clamping limit. In this way, the connection structure of the two battery modules can be simplified, thereby helping to reduce the setting cost.

[0040] Specifically, in actual design, one of the two adjacent battery modules may be provided with a first end plate 1 and the other may be provided with a second end plate 2, that is, the first end plate 1 is suitable for connecting to the end of one battery module, and the second end plate 2 is suitable for connecting to the end of another battery module, that is, the first end plate 1 and the second end plate 2 may be connected to the ends of the two battery modules, respectively, and respectively form the end plates of the two battery modules. Therefore, when the two battery modules are actually connected and fixed, the two battery modules may be arranged adjacent to each other and the first end plate 1 and the second end plate 2 may be connected to achieve relative fixation of the two battery modules. For example, the two battery modules may be stacked in the up-down direction, that is, one battery module is located above the other battery module, the first end plate 1 is connected to the end of one battery module and the second end plate 2 is connected to the end of the other battery module so that the first end plate 1 and the second end plate 2 are located on the same side and the first end plate 1 and the second end plate 2 are also arranged adjacent to each other.

[0041] Among them, the connection between the two end plates and the battery module can adopt the same connection method, such as the first end plate 1 is detachably connected to the end plate of a battery module by bolts and other structures, and similarly, the second end plate 2 is detachably connected to the end plate of another battery module by bolts and other structures. The structure is simple and disassembly is convenient, which is conducive to universal installation.

[0042] Therefore, when connecting and fixing two battery modules, it is only necessary to connect the fixing structures corresponding to the first end plate 1 and the second end plate 2 through the connector 3 and the clamping limiter. The structure is simple, and there is no need to set up a complex connection bracket, which simplifies the installation structure, reduces the number of installation parts, reduces the installation cost, and helps to improve the connection efficiency. In this way, it is helpful to improve the installation efficiency of the battery module, especially when the number and number of layers of the battery modules are even numbers, this structure is more suitable, so that more battery modules can be installed, and the first fixing part 11 and the second fixing part 21 will not occupy too much additional installation space, which is conducive to improving the overall energy density of the battery module.

[0043] In some embodiments, the battery pack 1000 further includes a connector 3, wherein the fixing portion of the end plate of one of the two adjacent battery modules is provided with a first connection hole 111 and the fixing portion of the end plate of the other one is provided with a second connection hole 211, and the connector 3 is passed through the first connection hole 111 and the second connection hole 211. For example, the first connection hole 111 is provided on the first fixing portion 11, and at the same time, the second connection hole 211 is provided on the second fixing portion 21, and then the connector 3 is passed through the first connection hole 111 and the second connection hole 211 in sequence to fix the first end plate 1 and the second end plate 2 relatively. Alternatively, the first connection hole 111 and the second connection hole 211 can be interchangeably provided, such as providing the first connection hole 111 on the second end plate 2 and providing the second connection hole 211 on the first end plate 1.

[0044] Among them, the first connection hole 111 can be directly formed when the first end plate 1 is designed and processed, that is, the first end plate 1 does not need to be processed again after being formed, and the forming method is simple. Similarly, the second connection hole 211 is also directly formed when the second end plate 2 is designed and processed. Therefore, it is helpful to reduce the overall design cost of the battery pack 1000. At the same time, during the actual connection, the fastening between the first end plate 1 and the second end plate 2 can be achieved by inserting and tightening the connector 3, and the installation process is simple.

[0045] In some embodiments, the first connection hole 111 is configured as a through hole, the second connection hole 211 is configured as a blind hole and has an internal thread, the connection member 3 is configured as a bolt, and the connection member 3 passes through the first connection hole 111 and extends into the second connection hole 211 to be threadedly matched with the internal thread. Figure 2 , Figure 3 and Fig.13 As shown, the first connection hole 111 is provided at the bottom of the first end plate 1 and is opened at the bottom of the first end plate 1 to form a through hole. Figure 2 , Figure 3 and Fig. 9 As shown, the second connection hole 211 is disposed at the top of the second end plate 2 and is opened upward at the top of the second end plate 2 to form a blind hole.

[0046] Thus, when the first end plate 1 and the second end plate 2 are connected and fixed, the lower end of the bolt can be passed through the first connection hole 111 and extended into the second connection hole 211, and the lower end of the bolt is threadedly engaged with the second connection hole 211 to achieve connection and fixation. The first connection hole 111 is set to be open upward, and the operator can place the battery module on the operating surface and insert the connector 3 from above the battery module for easy operation.

[0047] In some embodiments, the end plates of two adjacent battery modules are suitable for being distributed in sequence in the first direction, and the axis of the second connecting hole 211 of the battery module is perpendicular to the end plate. For example, the battery modules on both sides are distributed along the up and down directions, that is, the first end plate 1 and the second end plate 2 are arranged along the up and down directions, and the axis of the second connecting hole 211 is inclined relative to the up and down directions.

[0048] like Figure 3 As shown, the second connection hole 211 is opened toward the upper right, and Fig. 9 As shown, the second connection hole 211 is open toward the upper left, so that the second connection hole 211 can be tilted and opened in the outer area of ​​the corresponding end plate. In this way, when the operator inserts the connector 3 for connection, the connector 3 can be operated in the spacious space outside the battery module without being affected by the position of the battery module and the end plate itself, which is convenient for operation and helps to improve operating efficiency.

[0049] In some embodiments, the fixing portion of the end plate of one of the two adjacent battery modules is provided with a limiting protrusion 212 and the fixing portion of the other end plate is provided with a limiting recess 112, and the limiting protrusion 212 extends into the limiting recess 112 for snap-fitting. That is, the limiting protrusion 212 is provided on the first fixing portion 11, and the limiting recess 112 is provided on the second fixing portion 21, or the limiting protrusion 212 is provided on the second fixing portion 21, and the limiting recess 112 is provided on the first fixing portion 11.

[0050] like Figure 5 and Fig.12 As shown in FIG. 1 , a limiting recess 112 is provided at the lower portion of the first fixing portion 11. Figure 5 and Figure 8 As shown in the figure, a limiting protrusion 212 is provided on the upper part of the second fixing portion 21, and during actual installation, the first end plate 1 is installed above the second end plate 2, and the limiting protrusion 212 extends into the limiting recess 112, so that the outer surface of the limiting protrusion 212 is pressed against the inner wall surface of the limiting recess 112, thereby realizing the pressing and limiting of the first end plate 1 and the second end plate 2, thereby cooperating with the connecting piece 3 to enhance the connection stability of the first end plate 1 and the second end plate 2.

[0051] In a further embodiment, the limiting protrusion 212 fits with the limiting recess 112 to form a pressing contact surface 41 and a limiting contact surface 42, and an angle is formed between the pressing contact surface 41 and the limiting contact surface 42, that is, the limiting recess 112 and the limiting protrusion 212 are limited at two contact surfaces. Figure 5 As shown, the inner upper wall surface 113 of the limiting recess 112 contacts the outer upper wall surface 213 of the limiting protrusion 212 and forms a support for the contact surface along the up and down directions. At the same time, the inner right wall surface 114 of the limiting recess 112 contacts the outer right wall surface 214 of the limiting protrusion 212 and forms a limiting stop in the left and right directions.

[0052] Therefore, by setting the limiting recess 112 and the limiting protrusion 212 for cooperative installation, it is not only beneficial to realize the support of the first end plate 1 and the second end plate 2 so that the first end plate 1 is stably supported on the second end plate 2, but also can play a limiting role on the first end plate 1 and the second end plate 2, avoiding the first end plate 1 and the second end plate 2 from having no effective limit resulting in support misalignment, thereby achieving an effective connection effect.

[0053] In some embodiments, the end plates of two adjacent battery modules are suitable for being distributed in sequence in the first direction, and the angle between the limiting contact surface 42 and the first direction is less than 45°. Figure 2 and Figure 4 As shown, the first end plate 1 and the second end plate 2 are distributed in sequence in the up-down direction, and the first end plate 1 is located above the second end plate 2, the inner right wall surface 114 of the limiting recess 112 is fitted with the outer right wall surface 214 of the limiting protrusion 212, and the contact surfaces of the two form a limiting contact surface 42, and the angle between the limiting contact surface 42 and the up-down direction can be set to be less than 45°, such as 20°, 30° or 40°.

[0054] In this way, the limiting protrusion 212 and the limiting recess 112 can have a larger matching angle perpendicular to the up and down directions after matching, so that the limiting force between the limiting protrusion 212 and the limiting recess 112 is greater, ensuring that the limiting effect between the first end plate 1 and the second end plate 2 is more stable.

[0055] In addition, the angle between the limiting contact surface 42 and the pressing contact surface 41 ranges from 90° to 175°, and can be set to 120°, 130° or 140°, so that the first fixing part 11 and the second fixing part 21 can contact on two surfaces. At the same time, the existence of the angle facilitates the operator to perform bolt fixing without the need to set up a separate installation space.

[0056] In some embodiments, one of two adjacent battery modules is a first battery module 201 and the other is a second battery module 202, the first battery module 201 is provided with a first end plate 1, the first end plate 1 is provided with a first fixing portion 11, the second battery module 202 is provided with a second end plate 2, the second end plate 2 is provided with a second fixing portion 21, the first fixing portion 11 is fixedly connected to the second fixing portion 21, such as the second fixing portion 21 is connected to the first fixing portion 11 at at least one position through a connecting member 3 and is clamped and limited at at least another position, that is, the first fixing portion 11 and the second fixing portion 21 can be connected and fixed by the connecting member 3, and can also be clamped and limited to enhance the connection effect.

[0057] The connector 3 can be a threaded connector, such as a bolt, a screw, etc., which has a simple structure and is easy to disassemble, which is not only conducive to rapid installation but also conducive to subsequent disassembly and replacement. At the same time, through the clamping limit method, not only the first end plate 1 and the second end plate 2 can be quickly positioned, but also the first end plate 1 and the second end plate 2 can be limited and matched, and the auxiliary connector 3 can enhance the connection strength between the first end plate 1 and the second end plate 2, and improve the connection stability between the first end plate 1 and the second end plate 2. The first fixing portion 11 is integrally formed on the first end plate 1, and similarly, the second fixing portion 21 is integrally formed on the second end plate 2, that is, no separate structural member is required.

[0058] Furthermore, the first fixing portion 11 is configured to protrude from the side of the first end plate 1 away from the first battery module 201, and the second fixing portion 21 is configured to protrude from the side of the second end plate 2 away from the second battery module 202. Figure 2 and Fig.12 , Fig.13 As shown, the first fixing portion 11 is protruding relative to the outer side of the first end plate 1, so that the first connecting hole 111 and the limiting recess 112 provided on the first end plate 1 can extend outward relative to the main body of the first end plate 1. Figure 2 , Figure 8 and Fig. 9 As shown, the second fixing portion 21 is protruded relative to the outer side surface of the second end plate 2, so that the second connecting hole 211 and the limiting protrusion 212 provided on the second end plate 2 can extend outward relative to the main part of the second end plate 2.

[0059] Therefore, when the first end plate 1 and the second end plate 2 are connected, the matching positions of the first fixing portion 11 and the second fixing portion 21 protrude outward from the first end plate 1 and the second end plate 2, which facilitates the operator to perform alignment and connection operations on the outside of the battery module, and the structural design is more reasonable.

[0060] In some embodiments, the first end plate 1 and the second end plate 2 are suitable to be distributed in sequence in the up and down directions, and the first fixing portion 11 is arranged at the lower edge of the first end plate 1, and the second fixing portion 21 is arranged at the upper edge of the second end plate 2, that is, the first end plate 1 and the second end plate 2 can be connected and installed in the up and down directions.

[0061] For example, in actual applications, multiple battery modules can be stacked to share the horizontal space, thereby achieving the installation of a battery pack 1000 with a larger capacity. When connecting, the first end plate 1 and the second end plate 2 corresponding to two adjacent layers of battery modules can be connected. The structure is simple and the installation is convenient.

[0062] The present invention also proposes a battery pack 1000 .

[0063] According to the battery pack 1000 of the embodiment of the present invention, the end of one of the two adjacent battery modules is connected to a first end plate 1, and the end of the other battery module is provided with a second end plate 2. Therefore, by engaging the first fixing portion 11 of the first end plate 1 and the second fixing portion 21 of the second end plate 2 at the limiting recess 112 and the limiting protrusion 212 and connecting the first connecting hole 111 and the second connecting hole 211 through the connecting member 3, the two battery modules can be relatively fixed, the structure is simple, and the installation is convenient.

[0064] Therefore, when connecting two adjacent battery modules, there is no need to set up a complex connection bracket, simplifying the installation structure, reducing the number of installation parts, reducing installation costs, and helping to improve connection efficiency. In this way, the battery pack 1000 of the present invention is conducive to improving the installation efficiency of the battery module, especially when the number of battery modules and the number of layers are even numbers, this structure is more suitable, so that more battery modules can be installed, and the first fixing portion 11 and the second fixing portion 21 will not occupy too much additional installation space, which is conducive to improving the overall energy density of the battery module.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0066] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: The invention comprises at least two battery modules, wherein at least two of the battery modules are stacked in the height direction and / or width direction of the battery modules, and at least one end of the battery module in the length direction is provided with an end plate, and the end plate is provided with a fixing portion, and the fixing portions on the end plates of two adjacent battery modules at the same end in the length direction are fixedly connected; The battery pack further comprises a connector, a fixing portion of an end plate of one of two adjacent battery modules is provided with a first connecting hole and a fixing portion of the other end plate is provided with a second connecting hole, and the connector is passed through the first connecting hole and the second connecting hole; the end plates of the two adjacent battery modules are suitable for being distributed in sequence in a first direction, and the axis of the second connecting hole is perpendicular to the end plates; and the axis of the second connecting hole is inclined relative to the up-down direction; The fixing portion of the end plate of one of the two adjacent battery modules is provided with a limiting convex portion, and the fixing portion of the end plate of the other one is provided with a limiting concave portion, and the limiting convex portion extends into the limiting concave portion for snap-fitting; The limiting convex portion is fitted with the limiting concave portion to form a pressing contact surface and a limiting contact surface, and an angle is formed between the pressing contact surface and the limiting contact surface.

2. The battery pack according to claim 1, characterized in that: The first connecting hole is configured as a through hole, the second connecting hole is configured as a blind hole and has an internal thread, the connecting piece is configured as a bolt, and the connecting piece passes through the first connecting hole and extends into the second connecting hole to be threadably matched with the internal thread.

3. The battery pack according to claim 1, characterized in that: The end plates of two adjacent battery modules are suitable for being distributed in sequence in the first direction, the angle between the limiting contact surface and the first direction is less than 45°, and the angle between the limiting contact surface and the pressing contact surface ranges from 90° to 175°.

4. The battery pack according to claim 1, characterized in that: One of the two adjacent battery modules is a first battery module and the other is a second battery module, the first battery module is provided with a first end plate, the first end plate is provided with a first fixing portion, the second battery module is provided with a second end plate, the second end plate is provided with a second fixing portion, the first fixing portion and the second fixing portion are fixedly connected; The first fixing portion is configured to protrude from a side of the first end plate away from the first battery module, and the second fixing portion is configured to protrude from a side of the second end plate away from the second battery module.

5. The battery pack according to claim 4, characterized in that: The first end plate and the second end plate are suitable to be distributed in sequence in the up-down direction, and the first fixing portion is arranged at the lower edge of the first end plate, and the second fixing portion is arranged at the upper edge of the second end plate.

6. The battery pack according to claim 1, characterized in that: The fixing parts of the end plates of two adjacent battery modules are connected by a connecting piece and fixed by clamping and limiting.

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