Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, and relates to the technical field of batteries. The battery module provided by the utility model comprises a battery cell stacking body and a module shell, the module shell comprises a first pressing plate, a connecting rod, an elastic piece, a second pressing plate and a locking piece. An elastic piece is arranged between a battery cell stacking body and a first pressing plate and / or a second pressing plate, and at least one of the first pressing plate and the second pressing plate is arranged on a connecting rod in a sleeving manner and can move along the connecting rod so as to adjust the distance between the first pressing plate and the second pressing plate; the locking piece is used for fixing the first pressing plate and / or the second pressing plate sleeving the connecting rod on the connecting rod, so that the distance between the first pressing plate and the second pressing plate can be adjusted to adjust the locking force of the battery cell stack, and the expansion volume of the battery cell can be inhibited; the rigid extrusion of the module shell and the cell stack can be avoided, and the stability of the battery module can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technologies, and particularly to a battery module and a battery pack. Background Art

[0002] With the rapid development of the global new energy market and the continuous enhancement of environmental awareness, lithium batteries, as a new type of efficient and environmentally friendly energy source, have gradually become a hot topic. Lithium battery systems have been widely used in fields such as electric vehicles, energy storage systems, smart homes, and drones. A lithium battery module is one of the important components of a lithium battery system.

[0003] A liquid lithium-ion battery is composed of a positive electrode, a negative electrode, a separator, and an electrolyte. Its energy density has approached the theoretical limit, and it is prone to electrolyte leakage when subjected to external impact. Moreover, the electrolyte contains flammable organic solvents, and when an internal short circuit occurs, the temperature rises rapidly, which is likely to cause combustion or even explosion. To overcome the above disadvantages of liquid lithium-ion batteries, researchers are committed to the development of solid-state batteries. However, during the charge and discharge process of a solid-state battery cell, its metal electrodes will expand, causing the cells inside the battery module to squeeze each other, affecting the service life of the battery. Utility Model Content

[0004] This application provides a battery module, including: a cell stack and a module housing; the module housing includes a first pressing plate, a connecting rod, an elastic member, a second pressing plate, and a locking member;

[0005] The cell stack is formed by stacking a plurality of cells in the thickness direction;

[0006] The first pressing plate and the second pressing plate are oppositely arranged along the thickness direction of the cell stack, and the cell stack is clamped between the first pressing plate and the second pressing plate;

[0007] The elastic member is disposed between the cell stack and the first pressing plate and / or the second pressing plate;

[0008] At least one of the first pressing plate and the second pressing plate is sleeved on the connecting rod and can move along the connecting rod to adjust the distance between the first pressing plate and the second pressing plate;

[0009] The locking member is used to fix the first pressing plate and / or the second pressing plate sleeved on the connecting rod to the connecting rod.

[0010] In a possible implementation manner of this application, the first pressing plate is fixedly connected to the connecting rod, the second pressing plate is sleeved on the connecting rod, and can move along the connecting rod to adjust the distance between the first pressing plate and the second pressing plate; the locking member is used to fix the second pressing plate to the connecting rod.

[0011] In a possible implementation manner of the present application, along the thickness direction of the battery cell stack, the connecting rod includes a first connection end and a second connection end which are oppositely arranged. The first connection end is fixedly connected to the first pressing plate. A through hole adapted to the second connection end is provided on the second pressing plate. The second pressing plate is sleeved on the second connection end through the through hole and can move along the second connection end to adjust the distance between the first pressing plate and the second pressing plate. The locking member includes a nut, and the second connection end cooperates with the nut to fix the second pressing plate on the connecting rod.

[0012] In a possible implementation manner of the present application, the module housing further includes a lining plate, one side of the lining plate facing the battery cell stack is adapted, the lining plate is arranged between the elastic member and the battery cell stack, and the elastic member includes a spring plate. Two ends of the spring plate are respectively connected to the lining plate and the first pressing plate or the second pressing plate.

[0013] In a possible implementation manner of the present application, the elastic modulus of the material for preparing the spring plate is greater than 100 GPa; and / or

[0014] The material for preparing the spring plate includes stainless steel, metal alloy, or carbon fiber composite material.

[0015] In a possible implementation manner of the present application, the spring plate includes a first fixing portion, a second fixing portion, and a connecting portion. The first fixing portion and the second fixing portion are oppositely arranged along their length directions. The first fixing portion and the second fixing portion are respectively movably connected to the first pressing plate or the second pressing plate. The connecting portion is arranged between the first fixing portion and the second fixing portion and protrudes toward the side where the battery cell stack is located. One side of the connecting portion facing the battery cell stack is in contact.

[0016] In a possible implementation manner of the present application, an insulating buffer layer is provided on one side of the first pressing plate facing the battery cell stack, and the first pressing plate is in contact with the battery cell stack through the insulating buffer layer.

[0017] In a possible implementation manner of the present application, the module housing further includes a first end plate and a second end plate. The first end plate and the second end plate are arranged on two sides in the height direction of the battery cell stack. The first pressing plate is fixedly connected to the first end plate, the second end plate, and the connecting rod respectively.

[0018] In a possible implementation manner of the present application, the battery cell is a solid-state battery cell; and / or

[0019] The first pressing plate is a metal plate or an alloy plate; and / or

[0020] The second pressing plate is a metal plate or an alloy plate; and / or

[0021] The battery module further includes a tab connecting plate and a wire harness. Each battery cell is respectively connected to the tab connecting plate, and the tab connecting plate is electrically connected to an external device through the wire harness.

[0022] In a second aspect of the present application, a battery pack is provided, and the battery pack includes the battery module described above.

[0023] Beneficial effects:

[0024] In the present application, by providing an elastic member between the battery cell stack and the first pressing plate and / or the second pressing plate, at least one of the first pressing plate and the second pressing plate is sleeved on the connecting rod and can move along the connecting rod to adjust the distance between the first pressing plate and the second pressing plate. The locking member is used to fix the first pressing plate and / or the second pressing plate sleeved on the connecting rod to the connecting rod, so that the distance between the first pressing plate and the second pressing plate can be adjusted to adjust the locking force on the battery cell stack. Since the first pressing plate or the second pressing plate can apply an extrusion force to the battery cell stack through the elastic member, the elastic member can restrain the expansion volume of the battery cell, avoid rigid extrusion between the module housing and the battery cell stack, and can adjust the magnitude of the extrusion force received by the battery cell stack, which is beneficial to improving the stability of the battery module. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Reference Numerals in the Drawings:

[0027] 100, battery module; 10, battery cell stack; 11, battery cell; 21, first pressing plate; 22, connecting rod; 221, first connection end; 222, second connection end; 23, elastic member; 231, first fixing portion; 231a, guiding groove; 232, second fixing portion; 233, connecting portion; 24, second pressing plate; 25, inner lining plate; 26, insulating buffer layer; 271, first end plate; 272, second end plate; 28, tab connecting plate; 29, wire harness; X, thickness direction; H, height direction.

[0028] Figure 1 It is a schematic structural diagram of an embodiment of the battery module provided by the embodiment of the present application;

[0029] Figure 2 is Figure 1 a three-dimensional structural schematic diagram of the elastic member in

[0030] Figure 3 is Figure 2 a structural schematic diagram of the elastic member in another perspective in Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation of the present utility model.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0034] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description". Any embodiment described as "exemplary" in this application is not necessarily to be construed as more preferred or more advantageous than other embodiments. In order for any person skilled in the art to implement and use the present utility model, the following description is given. In the following description, details are set forth for purposes of explanation. It should be understood by those skilled in the art that the present utility model can be implemented without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of the present utility model with unnecessary details. Therefore, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in this application.

[0035] In the related art, a lithium-ion liquid battery is composed of a positive electrode, a negative electrode, a separator, and an electrolyte. Its energy density has approached the theoretical limit, and electrolyte leakage is likely to occur when it is subjected to external impact. Moreover, the electrolyte contains flammable organic solvents, and when an internal short circuit occurs, the temperature rises rapidly, which is likely to cause combustion or even explosion. In order to overcome the above disadvantages of lithium-ion liquid batteries, researchers are committed to the development of solid-state batteries. However, during the charging and discharging process of a solid-state battery cell, its metal electrodes will expand, causing the cells inside the battery module to squeeze each other, affecting the service life of the battery.

[0036] In view of this, an embodiment of the present application provides a battery module, which includes a cell stack and a module housing. The module housing includes a first pressing plate, a connecting rod, an elastic member, a second pressing plate, and a locking member. In the present application, an elastic member is provided between the cell stack and the first pressing plate and / or the second pressing plate. At least one of the first pressing plate and the second pressing plate is sleeved on the connecting rod and can move along the connecting rod to adjust the distance between the first pressing plate and the second pressing plate. The locking member is used to fix the first pressing plate and / or the second pressing plate sleeved on the connecting rod to the connecting rod, so as to be able to adjust the distance between the first pressing plate and the second pressing plate to adjust the locking force on the cell stack. Since the first pressing plate or the second pressing plate can apply a squeezing force to the cell stack through the elastic member, the elastic member can inhibit the expansion volume of the cell, which is beneficial to improving the stability of the battery module. For ease of understanding, the battery module in the present application will be further described below with reference to specific embodiments.

[0037] Please refer to Figures 1 to 3 , an embodiment of the present application provides a battery module 100, which includes a cell stack 10 and a module housing. Exemplarily, the cell stack 10 in the embodiment of the present application is used to store or release electrical energy. The module housing is used to provide an installation space and protect the cell stack 10 installed therein.

[0038] In the embodiment of the present application, the cell stack 10 is formed by stacking a plurality of cells 11 in the thickness direction X. Exemplarily, each cell 11 is generally square in structure, the shapes and sizes of each cell 11 are the same or approximate, the thickness direction X of each cell 11 is parallel to the horizontal direction, the largest surface of each cell 11 is perpendicular to the X-axis direction, and a plurality of cells 11 are stacked in the X-axis direction to form the cell stack 10.

[0039] In an embodiment of the present application, the module housing includes a first pressing plate 21, a connecting rod 22, an elastic member 23, a second pressing plate 24, and a locking member. The first pressing plate 21 and the second pressing plate 24 are oppositely arranged along the thickness direction X of the battery cell stack 10, and the battery cell stack 10 is clamped between the first pressing plate 21 and the second pressing plate 24.

[0040] Exemplarily, along the thickness direction X of the battery cell stack 10, the battery cell stack 10 includes a first side surface and a second side surface that are oppositely arranged. The first pressing plate 21 is arranged on one side of the first side surface away from the second side surface, and the second pressing plate 24 is arranged on one side of the second side surface away from the first side surface. The first pressing plate 21 covers the first side surface, that is, the orthographic projection of the first side surface on the first pressing plate 21 is located within the first pressing plate 21. The second pressing plate 24 covers the second side surface, that is, the orthographic projection of the second side surface on the second pressing plate 24 is located within the second pressing plate 24. In the present application, the battery cell stack 10 being clamped between the first pressing plate 21 and the second pressing plate 24 means that the battery cell stack 10 is arranged between the first pressing plate 21 and the second pressing plate 24, and the first pressing plate 21 applies an extrusion force to the battery cell stack 10 on the first side surface, and the second pressing plate 24 applies an extrusion force to the battery cell stack 10 on the first side surface.

[0041] In an embodiment of the present application, the elastic member 23 is arranged between the battery cell stack 10 and the first pressing plate 21 and / or the second pressing plate 24. Thus, by arranging the elastic member 23 between the battery cell stack 10 and the first pressing plate 21 and / or the second pressing plate 24, the elastic member 23 can restrain the expansion volume of the battery cell 11, avoid the rigid extrusion between the module housing and the battery cell stack 10, and can adjust the magnitude of the extrusion force received by the battery cell stack 10, which is beneficial to improving the stability of the battery module 100.

[0042] Exemplarily, the elastic member 23 is only arranged between the battery cell stack 10 and the first pressing plate 21. Again exemplarily, the elastic member 23 is only arranged between the battery cell stack 10 and the second pressing plate 24. Again exemplarily, one elastic member 23 is arranged between the battery cell stack 10 and the first pressing plate 21, and one elastic member 23 is arranged between the battery cell stack 10 and the second pressing plate 24.

[0043] In an embodiment of the present application, at least one of the first pressing plate 21 and the second pressing plate 24 is sleeved on the connecting rod 22 and can move along the connecting rod 22 to adjust the distance between the first pressing plate 21 and the second pressing plate 24; the locking member is used to fix the first pressing plate 21 and / or the second pressing plate 24 sleeved on the connecting rod 22 to the connecting rod 22. In this way, by adjusting the distance between the first pressing plate 21 and the second pressing plate 24, the magnitude of the pressing force applied to the battery cell stack 10 can be further adjusted.

[0044] Exemplarily, the first pressing plate 21 is fixedly connected to the connecting rod 22 (that is, there is no relative movement between the first pressing plate 21 and the connecting rod 22), the second pressing plate 24 is sleeved on the connecting rod 22 and can move along the connecting rod 22 to adjust the distance between the first pressing plate 21 and the second pressing plate 24. For example, the second pressing plate 24 is slidably sleeved on the connecting rod 22. The second pressing plate 24 can slide along the connecting rod 22 towards the first pressing plate 21 to reduce the distance between the first pressing plate 21 and the second pressing plate 24, and the second pressing plate 24 can also slide along the connecting rod 22 away from the first pressing plate 21 to increase the distance between the first pressing plate 21 and the second pressing plate 24. The locking member is used to fix the second pressing plate 24 to the connecting rod 22. For example, the locking member is used to fix the second pressing plate 24 to the connecting rod 22 after the second pressing plate 24 is adjusted to a suitable position. After the second pressing plate 24 is fixed to the connecting rod 22 by the locking member, there is no relative movement between the second pressing plate 24 and the connecting rod 22.

[0045] Similarly, it may also be that the second pressing plate 24 is fixedly connected to the connecting rod 22, the first pressing plate 21 is sleeved on the connecting rod 22 and can move along the connecting rod 22 to adjust the distance between the first pressing plate 21 and the second pressing plate 24, and the locking member is used to fix the first pressing plate 21 sleeved on the connecting rod 22 to the connecting rod 22. Of course, it may also be that both the first pressing plate 21 and the second pressing plate 24 are sleeved on the connecting rod 22 and can move along the connecting rod 22 to adjust the distance between the first pressing plate 21 and the second pressing plate 24; the locking member is used to fix the first pressing plate 21 and the second pressing plate 24 sleeved on the connecting rod 22 to the connecting rod 22.

[0046] In this application, an elastic member 23 is provided between the battery cell stack 10 and the first pressing plate 21 and / or the second pressing plate 24. At least one of the first pressing plate 21 and the second pressing plate 24 is sleeved on the connecting rod 22 and can move along the connecting rod 22 to adjust the distance between the first pressing plate 21 and the second pressing plate 24. The locking member is used to fix the first pressing plate 21 and / or the second pressing plate 24 sleeved on the connecting rod 22 to the connecting rod 22, so that the distance between the first pressing plate 21 and the second pressing plate 24 can be adjusted to adjust the locking force on the battery cell stack 10. Since the first pressing plate 21 or the second pressing plate 24 can apply a pressing force to the battery cell stack 10 through the elastic member 23, the elastic member 23 can restrain the expansion volume of the battery cell 11, avoid the rigid extrusion between the module housing and the battery cell stack 10, and can adjust the magnitude of the pressing force received by the battery cell stack 10, which is beneficial to improving the stability of the battery module 100.

[0047] In some embodiments of the present application, along the thickness direction X of the battery cell stack 10, the connecting rod 22 includes a first connection end 221 and a second connection end 222 which are oppositely arranged. The first connection end 221 is fixedly connected to the first pressing plate 21. The second pressing plate 24 is provided with a through hole (not shown in the figure) adapted to the second connection end 222. The second pressing plate 24 is sleeved on the second connection end 222 through the through hole and can move along the second connection end 222 to adjust the distance between the first pressing plate 21 and the second pressing plate 24. The locking member includes a nut, and the second connection end 222 cooperates with the nut to fix the second pressing plate 24 to the connecting rod 22. In this embodiment, by providing a through hole in the second pressing plate 24, the second pressing plate 24 is sleeved on the second connection end 222 through the through hole and can move along the second connection end 222 to adjust the distance between the first pressing plate 21 and the second pressing plate 24. The locking member includes a nut, and the second connection end 222 cooperates with the nut to fix the second pressing plate 24 to the connecting rod 22, so that the structure of the battery module 100 in the present application is simpler.

[0048] Specifically, the second connection end 222 is a pin shaft, and an external thread is provided on the surface of the pin shaft. The second pressing plate 24 is provided with a through hole adapted to the pin shaft. The second pressing plate 24 is sleeved on the second connection end 222 through the through hole. An internal thread adapted to the external thread is provided on the surface of the nut, and the nut cooperates with the pin shaft to fix the second pressing plate 24 to the connecting rod 22.

[0049] In some embodiments of the present application, please continue to refer to Figure 1, the module housing further includes a lining plate 25, one side of the lining plate 25 facing the battery cell stack 10 is adapted, the lining plate 25 is disposed between the elastic member 23 and the battery cell stack 10, the elastic member 23 includes a spring plate, and two ends of the spring plate are respectively connected to the lining plate 25 and the first pressing plate 21 or the second pressing plate 24. The one side of the lining plate 25 facing the battery cell stack 10 being adapted means that the contact between the lining plate 25 and the battery cell stack 10 is surface-to-surface contact. Exemplarily, the side of the lining plate 25 facing the battery cell stack 10 is a plane, and the side of the battery cell stack 10 facing the lining plate 25 is also a plane, so that there is a large contact area between the lining plate 25 and the battery cell stack 10, and a uniform and stable pressing force can be applied to the side of the battery cell stack 10 in contact, which is beneficial to improving the stability of the battery module 100.

[0050] In some embodiments of the present application, the elastic modulus of the material for preparing the spring plate is greater than 100 GPa. In this way, it can be ensured that the spring plate has a high strength, can withstand a large range of pressing forces, and is beneficial to improving the service life and applicable scenarios of the spring plate.

[0051] In some embodiments of the present application, please refer to Figure 2 and Figure 3 , the spring plate includes a first fixing portion 231, a second fixing portion 232, and a connecting portion 233. The first fixing portion 231 and the second fixing portion 232 are disposed opposite to each other along their length directions. The first fixing portion 231 and the second fixing portion 232 are respectively movably connected to the first pressing plate 21 or the second pressing plate 24. The connecting portion 233 is disposed between the first fixing portion 231 and the second fixing portion 232 and protrudes toward the side where the battery cell stack 10 is located. One side of the connecting portion 233 facing the battery cell stack 10 abuts. In this way, when the elastic plate is squeezed, the spring plate can deform under the action of the pressing force and move relative to the first pressing plate 21 or the second pressing plate 24, which is beneficial to the stability of the battery module 100 in the embodiments of the present application.

[0052] Specifically, the first fixing part 231 and the second fixing part 232 are respectively movably connected to the second pressing plate 24. A plurality of guiding grooves 231a are provided on both the first fixing part 231 and the second fixing part 232, and a limiting shaft (not shown in the figure) adapted to the guiding grooves 231a is provided on the second pressing plate 24. Each guiding groove 231a extends along the height direction H of the battery cell stack 10, and the limiting shaft is slidably arranged in the guiding groove 231a. For example, the size of the guiding groove 231a along the height direction H of the battery cell stack 10 is between 01 mm and 100 mm. In this way, when the spring plate is squeezed and deformed, the size of the spring plate in the thickness direction X of the battery cell stack 10 becomes smaller, and the first fixing part 231 and the second fixing part 232 can move away from each other along the guiding groove 231a, and the size of the spring plate in the height direction H of the battery cell stack 10 becomes larger.

[0053] Specifically, the thickness of any part of the spring plate is the same. For example, the thickness of any part of the spring plate is between 0.1 mm and 10 mm.

[0054] Specifically, both the first fixing part 231 and the second fixing part 232 are planes, and the surface of the second pressing plate 24 facing the battery cell stack 10 is a plane. The first fixing part 231 and the second fixing part 232 are respectively fixedly connected to the surface of the second pressing plate 24 facing the battery cell stack 10. The connecting part 233 protrudes on the side where the battery cell stack 10 is located, and the connecting part 233 includes a plurality of convex parts with a cross-section in the shape of the letter "V".

[0055] In some embodiments of the present application, the material for preparing the spring plate includes stainless steel, metal alloy, or carbon fiber composite material.

[0056] In some embodiments of the present application, please refer to Figure 1 , an insulating buffer layer 26 is provided on the side of the first pressing plate 21 facing the battery cell stack 10, and the first pressing plate 21 abuts against the battery cell stack 10 through the insulating buffer layer 26. In this way, it can be avoided that the rigid first pressing plate 21 directly contacts the battery cell stack 10, and the first pressing plate 21 is prevented from conducting electricity, which is beneficial to improving the buffer performance and safety performance of the battery module 100.

[0057] In some embodiments of the present application, please refer to Figure 1 , the module housing further includes a first end plate 271 and a second end plate 272. The first end plate 271 and the second end plate 272 are arranged on both sides of the battery cell stack 10 in the height direction H, and the first pressing plate 21 is respectively fixedly connected to the first end plate 271, the second end plate 272, and the connecting rod 22. In this way, it is beneficial to improve the structural strength and sealing performance of the module housing.

[0058] In some embodiments of the present application, the battery cell 11 is a solid-state battery cell. In this way, it is beneficial to improve the safety performance and energy density of the battery module 100.

[0059] In some embodiments of the present application, the first pressing plate 21 is a metal plate or an alloy plate. In some other embodiments, the second pressing plate 24 is a metal plate or an alloy plate. In this way, it is beneficial to improve the mechanical strength of the module housing.

[0060] In some embodiments of the present application, please refer to Figure 1 , the battery module 100 further includes a tab connecting plate 28 and a wire harness 29. Each battery cell 11 is respectively connected to the tab connecting plate 28, and the tab connecting plate 28 is electrically connected to an external device through the wire harness 29.

[0061] In some embodiments of the present application, the first connection end 221 of the connecting rod 22 is fixedly connected to the first pressing plate 21, the second connection end 222 of the connecting rod 22 passes through the second pressing plate 24 and is fixedly connected to the locking member, and the first pressing plate 21 and the second pressing plate 24 are connected to each other through a connecting member. Exemplarily, the tightening torque between the second connection end 222 and the locking member can be adjusted. For example, the tightening torque between the second connection end 222 and the locking member is adjustable between 0.1 N·m and 50 N·m. The locking member squeezes the spring plate to deform through the second pressing plate 24. For another example, the force generated during the deformation of the spring plate is between 10 N and 20,000 N, and indirectly acts on the battery cell stack 10 through the inner lining plate 25, so as to apply a constant pressure to each battery cell 11 in the battery cell stack 10.

[0062] The embodiments of the present application further provide a battery pack, which includes at least one of the above-mentioned battery modules 100. Since the battery pack in the embodiments of the present application includes the above battery module 100, it thus has the beneficial effects of the battery module 100 described in the present application. Exemplarily, the battery pack includes a box body and a plurality of battery modules 100, and the plurality of battery modules 100 are fixed in the box body.

[0063] In some embodiments of the present application, the battery pack further includes an electrical system, a thermal management system, a BMS (Battery Management System), etc. It should be noted that the electrical system, the thermal management system, and the BMS are not the main improvement points of the present application and will not be elaborated here.

[0064] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the detailed descriptions of other embodiments above, and will not be elaborated here.

[0065] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

[0066] At the same time, this application uses specific terms to describe the embodiments of this application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0067] Similarly, it should be noted that, in order to simplify the expression of the disclosure of this application and thus help the understanding of one or more utility model embodiments, in the previous description of the embodiments of this application, sometimes multiple features are grouped into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the features required by the subject matter of this application are more than those mentioned in the claims. In fact, the features of the embodiments are less than all the features of the individual embodiments disclosed above.

[0068] In some embodiments, numbers describing the components and attribute quantities are used. It should be understood that such numbers used for the description of embodiments are, in some examples, modified by the modifiers "about", "approximate", or "substantially". Unless otherwise specified, "about", "approximate", or "substantially" indicate that the numbers allow a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and such approximate values can change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining general digits. Although the numerical ranges and parameters used to confirm the scope breadth in some embodiments of this application are approximate values, in specific embodiments, such numerical settings are as precise as possible within the feasible range.

[0069] The above has introduced in detail a battery module and a battery pack provided by an embodiment of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A battery module, characterized in that, Comprising: a battery cell stack and a module housing; the module housing includes a first pressing plate, a connecting rod, an elastic member, a second pressing plate, and a locking member; the battery cell stack is formed by stacking a plurality of battery cells in the thickness direction; the first pressing plate and the second pressing plate are oppositely arranged along the thickness direction of the battery cell stack, and the battery cell stack is clamped between the first pressing plate and the second pressing plate; the elastic member is disposed between the battery cell stack and the first pressing plate and / or the second pressing plate; at least one of the first pressing plate and the second pressing plate is sleeved on the connecting rod and can move along the connecting rod to adjust the distance between the first pressing plate and the second pressing plate; the locking member is used to fix the first pressing plate and / or the second pressing plate sleeved on the connecting rod to the connecting rod; the module housing further includes a lining plate, one side of the lining plate facing the battery cell stack is adapted, the lining plate is disposed between the elastic member and the battery cell stack, the elastic member includes a spring plate, and two ends of the spring plate are respectively connected to the lining plate and the first pressing plate or the second pressing plate.

2. The battery module according to claim 1, wherein The first pressing plate is fixedly connected to the connecting rod, the second pressing plate is sleeved on the connecting rod and can move along the connecting rod to adjust the distance between the first pressing plate and the second pressing plate; the locking member is used to fix the second pressing plate to the connecting rod.

3. The battery module according to claim 2, wherein Along the thickness direction of the battery cell stack, the connecting rod includes a first connection end and a second connection end which are oppositely arranged, the first connection end is fixedly connected to the first pressing plate, a through hole adapted to the second connection end is provided on the second pressing plate, the second pressing plate is sleeved on the second connection end through the through hole and can move along the second connection end to adjust the distance between the first pressing plate and the second pressing plate, and the locking member includes a nut, and the second connection end cooperates with the nut to fix the second pressing plate to the connecting rod.

4. The battery module according to claim 1, wherein, The elastic modulus of the material for preparing the spring plate is greater than 100 GPa; and / or The material for preparing the spring plate includes stainless steel, metal alloy, or carbon fiber composite material.

5. The battery module according to claim 1, characterized in that The spring plate includes a first fixing portion, a second fixing portion, and a connecting portion, the first fixing portion and the second fixing portion are oppositely arranged along their length directions, the first fixing portion and the second fixing portion are respectively movably connected to the first pressing plate or the second pressing plate, the connecting portion is disposed between the first fixing portion and the second fixing portion and protrudes toward the side where the battery cell stack is located, and one side of the connecting portion facing the battery cell stack abuts.

6. The battery module according to claim 2, wherein, An insulating buffer layer is provided on one side of the first pressing plate facing the battery cell stack, and the first pressing plate abuts against the battery cell stack through the insulating buffer layer.

7. The battery module according to claim 2, wherein, The module housing further includes a first end plate and a second end plate, the first end plate and the second end plate are disposed on both sides of the battery cell stack in the height direction, and the first pressing plate is fixedly connected to the first end plate, the second end plate, and the connecting rod respectively.

8. The battery module according to claim 1, characterized in that The battery cell is a solid-state battery cell; and / or The first pressing plate is a metal plate or an alloy plate; and / or The second pressing plate is a metal plate or an alloy plate; and / or The battery module further includes a tab connecting plate and a wire harness. Each of the battery cells is respectively connected to the tab connecting plate, and the tab connecting plate is electrically connected to an external device through the wire harness.

9. A battery pack, characterized in that, The battery pack includes at least one battery module according to any one of claims 1 to 8.

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