Battery module and battery pack

Abstract

A battery module (100) and a battery pack. The battery module (100) comprises cell stacks (10) and a module housing. The module housing comprises: a first pressing plate (21), connecting rods (22), an elastic member (23), a second pressing plate (24), and a locking member. The described battery module (100) can inhibit the volume expansion of a battery cell (11), and can avoid rigid extrusion of the module housing and the cell stacks (10), thereby improving the stability of the battery module (100).

Description

Battery module and battery pack

[0001] This application claims priority to the Chinese patent application No. 202421522802.4 filed on June 28, 2024 with the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery module and a battery pack. BACKGROUND

[0003] With the rapid development of the global new energy market and the continuous enhancement of environmental awareness, lithium batteries, as a kind of efficient and environmentally friendly new energy, have gradually become a hot topic. Lithium battery systems have been widely used in electric vehicles, energy storage systems, smart homes, drones and other fields. Lithium battery modules are one of the important components of lithium battery systems.

[0004] 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 force impact. Moreover, the electrolyte contains flammable organic solvents, and the temperature rises rapidly when internal short circuit occurs, which can easily cause combustion or even explosion. In order to overcome the above shortcomings of liquid lithium ion batteries, researchers have devoted themselves to the development of solid-state batteries. However, the metal electrode of the solid-state battery cell will swell during charging and discharging, causing the internal cells of the battery module to be pressed against each other, affecting the service life of the battery. TECHNICAL PROBLEM TECHNICAL SOLUTION

[0005] The present application provides a battery module, comprising: a cell stack 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;

[0006] The cell stack is formed by stacking a plurality of cells in the thickness direction;

[0007] The first pressing plate and the second pressing plate are oppositely arranged in the thickness direction of the cell stack, and the cell stack is clamped between the first pressing plate and the second pressing plate;

[0008] The elastic piece is arranged between the cell stack and the first pressing plate and / or the second pressing plate;

[0009] 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;

[0010] The locking member is used for fixing the first pressing plate and / or the second pressing plate on the connecting rod.

[0011] In a possible implementation manner of the application, the first pressing plate is fixedly connected with 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, and the locking member is used for fixing the second pressing plate on the connecting rod.

[0012] In a possible implementation manner of the application, along the thickness direction of the cell stack, the connecting rod comprises oppositely arranged first and second connecting ends, the first connecting end is fixedly connected with the first pressing plate, the second pressing plate is provided with a through hole matched with the second connecting end, the second pressing plate is sleeved on the second connecting end through the through hole and can move along the second connecting end to adjust the distance between the first pressing plate and the second pressing plate, and the locking member comprises a nut, the second connecting end is matched with the nut to fix the second pressing plate on the connecting rod.

[0013] In a possible implementation manner of the application, the module shell further comprises an inner lining plate, one side of the inner lining plate is matched with the cell stack, the inner lining plate is arranged between the elastic member and the cell stack, and the elastic member comprises a spring plate, two ends of the spring plate are respectively connected with the inner lining plate and the first pressing plate or the second pressing plate.

[0014] In a possible implementation manner of the application, the elastic modulus of the material for preparing the spring plate is greater than 100 GPa; and / or

[0015] The material for preparing the spring plate comprises stainless steel, metal alloy or carbon fiber composite material.

[0016] In a possible implementation manner of the application, the spring plate comprises first and second fixed parts and a connecting part, the first and second fixed parts are oppositely arranged along the length direction thereof, the first and second fixed parts are movably connected with the first pressing plate or the second pressing plate respectively, the connecting part is arranged between the first and second fixed parts and protrudes towards the side where the cell stack is located, and the connecting part abuts against the side of the cell stack.

[0017] In a possible implementation manner of the application, the first pressing plate is provided with an insulating buffer layer on the side facing the cell stack, and the first pressing plate abuts against the cell stack through the insulating buffer layer.

[0018] In a possible implementation of the present application, the module shell further comprises a first end plate and a second end plate, the first end plate and the second end plate are arranged on both sides of the height direction of the cell stack, and the first pressing plate is fixedly connected with the first end plate, the second end plate and the connecting rod respectively.

[0019] In a possible implementation of the present application, the cell is a solid-state cell; and / or

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

[0021] The second pressing plate is a metal plate or an alloy plate; and / or

[0022] The battery module further comprises a tab connecting plate and a wire harness, each cell is connected with the tab connecting plate, and the tab connecting plate is electrically connected with an external device through the wire harness.

[0023] The second aspect of the present application provides a battery pack, which comprises the battery module. Advantages

[0024] In the present application, the elastic member is arranged 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, and the locking member is used to fix the first pressing plate and / or the second pressing plate sleeved on the connecting rod on the connecting rod, so that the locking force of the cell stack can be adjusted by adjusting the distance between the first pressing plate and the second pressing plate. Since the first pressing plate or the second pressing plate can apply extrusion force to the cell stack through the elastic member, the elastic member can inhibit the expansion volume of the cell, can avoid rigid extrusion of the module shell and the cell stack, and can adjust the extrusion force received by the cell stack, which is beneficial to improve the stability of the battery module. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] FIG. 1 is a structural schematic diagram of one embodiment of the battery module provided by the present application;

[0027] FIG. 2 is a schematic diagram of the structure of the elastic member in FIG. 1;

[0028] Fig. 3 is a structural schematic view of the elastic member in Fig. 2 from another perspective.

[0029] Reference signs:

[0030] 100, battery module; 10, cell stack; 11, cell; 21, first pressing plate; 22, connecting rod; 221, first connecting end; 222, second connecting end; 23, elastic member; 231, first fixing part; 231a, guide groove; 232, second fixing part; 233, connecting part; 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. Embodiments of the application

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0034] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable any person skilled in the art to make and use the application. Details are set forth in the following description for purpose of explanation. It should be appreciated that one of ordinary skill in the art will readily recognize that the application can be practiced without the use of these specific details. In other instances, well-known structures and processes have not been described in detail in order to avoid obscuring the description of the application. Thus, the present application is not intended to be limited by the embodiments shown, but is to be accorded with the widest scope consistent with the principles and features disclosed.

[0035] In the related art, a liquid lithium ion battery is composed of a positive electrode, a negative electrode, a separator, and an electrolyte. The energy density of the liquid lithium ion battery has approached the theoretical limit, and the electrolyte is prone to leakage when subjected to external force impact. Moreover, the electrolyte contains flammable organic solvents, and the temperature rises sharply when internal short circuit occurs, which can easily cause combustion or even explosion. In order to overcome the above-mentioned shortcomings of the liquid lithium ion battery, researchers have devoted to the development of solid-state batteries. However, the metal electrode of the solid-state battery cell will swell during the charging and discharging process, causing the internal cells of the battery module to be pressed against each other, which affects the service life of the battery.

[0036] In view of this, the embodiments of the present application provide a battery module, which comprises a cell stack and a module shell. The module shell comprises a first pressing plate, a connecting rod, an elastic member, a second pressing plate, and a locking member. In the present application, the elastic member is arranged 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 on the connecting rod, so as to adjust the locking force of the cell stack by adjusting the distance between the first pressing plate and the second pressing plate. Since the first pressing plate or the second pressing plate can apply a pressing force to the cell stack through the elastic member, the elastic member can inhibit the swelling volume of the cell, which is beneficial to improve the stability of the battery module. For the convenience of understanding, the battery module in the present application will be further described in combination with specific embodiments.

[0037] Please refer to FIGS. 1 to 3, the embodiments of the present application provide a battery module 100, which comprises a cell stack 10 and a module shell. Exemplarily, the cell stack 10 in the embodiments of the present application is used to store or release electric energy. The module shell is used to provide a mounting space and protect the cell stack 10 mounted therein.

[0038] In the embodiments of the present application, the cell stack 10 is formed by stacking a plurality of cells 11 along the thickness direction X. Each cell 11 is square in shape, and each cell 11 has the same or similar shape and size. The thickness direction X of each cell 11 is parallel to the horizontal direction, and the largest surface of each cell 11 is perpendicular to the X-axis direction. The plurality of cells 11 are stacked along the X-axis direction to form the cell stack 10.

[0039] In the embodiments of the present application, the module shell 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 cell stack 10, and the cell stack 10 is clamped between the first pressing plate 21 and the second pressing plate 24.

[0040] In the embodiments of the present application, the cell stack 10 includes a first side and a second side oppositely arranged along the thickness direction X of the cell stack 10. The first pressing plate 21 is arranged on the side of the first side away from the second side, and the second pressing plate 24 is arranged on the side of the second side away from the first side. The first pressing plate 21 covers the first side, i.e., the orthographic projection of the first side on the first pressing plate 21 is located in the first pressing plate 21. The second pressing plate 24 covers the second side, i.e., the orthographic projection of the second side on the second pressing plate 24 is located in the second pressing plate 24. In the present application, the cell stack 10 clamped between the first pressing plate 21 and the second pressing plate 24 means that the cell stack 10 is arranged between the first pressing plate 21 and the second pressing plate 24, and the first pressing plate 21 applies a pressing force to the cell stack 10 on the first side, and the second pressing plate 24 applies a pressing force to the cell stack 10 on the first side.

[0041] In the embodiments of the present application, the elastic member 23 is arranged between the cell stack 10 and the first pressing plate 21 and / or the second pressing plate 24. In this way, by arranging the elastic member 23 between the cell stack 10 and the first pressing plate 21 and / or the second pressing plate 24, the elastic member 23 can inhibit the swelling volume of the cell 11, avoid rigid pressing of the module shell and the cell stack 10, and adjust the pressing force received by the cell stack 10, which is beneficial to improve the stability of the battery module 100.

[0042] In the embodiments of the present application, the elastic member 23 is arranged between the cell stack 10 and the first pressing plate 21 and / or the second pressing plate 24. In this way, by arranging the elastic member 23 between the cell stack 10 and the first pressing plate 21 and / or the second pressing plate 24, the elastic member 23 can inhibit the swelling volume of the cell 11, avoid rigid pressing of the module shell and the cell stack 10, and adjust the pressing force received by the cell stack 10, which is beneficial to improve the stability of the battery module 100.

[0043] In the embodiments 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 is movable 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 and / or the second pressing plate 24 sleeved on the connecting rod 22 on 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 pressure applied to the cell stack 10 can be further adjusted.

[0044] For example, the first pressing plate 21 is fixedly connected with the connecting rod 22 (i.e., no relative movement occurs between the first pressing plate 21 and the connecting rod 22), and the second pressing plate 24 is sleeved on the connecting rod 22 and is movable 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, and the second pressing plate 24 is movable 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 is movable 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 on the connecting rod 22, for example, to fix the second pressing plate 24 on the connecting rod 22 after the second pressing plate 24 is adjusted to a suitable position. When the second pressing plate 24 is fixed on the connecting rod 22 by the locking member, no relative movement occurs between the second pressing plate 24 and the connecting rod 22.

[0045] Similarly, the second pressing plate 24 can also be fixedly connected with the connecting rod 22, the first pressing plate 21 is sleeved on the connecting rod 22 and is movable 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 on the connecting rod 22. Of course, the first pressing plate 21 and the second pressing plate 24 can also be sleeved on the connecting rod 22 and are movable 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 and the second pressing plate 24 sleeved on the connecting rod 22 on the connecting rod 22.

[0046] In the present application, the elastic member 23 is arranged between the 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, and 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 on the connecting rod 22, so that the locking force of the cell stack 10 can be adjusted by adjusting the distance between the first pressing plate 21 and the second pressing plate 24. Since the first pressing plate 21 or the second pressing plate 24 can apply extrusion force to the cell stack 10 through the elastic member 23, the elastic member 23 can inhibit the expansion volume of the cell 11, avoid rigid extrusion of the module shell and the cell stack 10, and adjust the extrusion force received by the cell stack 10, which is beneficial to improve the stability of the battery module 100.

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

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

[0049] In some embodiments of the present application, referring to FIG. 1, the module housing further comprises an inner lining plate 25, which is adapted to be in surface-to-surface contact with the cell stack 10. The inner lining plate 25 is arranged between the elastic member 23 and the cell stack 10, and the elastic member 23 comprises a spring plate, both ends of which are connected to the inner lining plate 25 and the first or second pressing plate 21 or 24, respectively. The inner lining plate 25 is adapted to be in surface-to-surface contact with the cell stack 10, for example, the surface of the inner lining plate 25 facing the cell stack 10 is a plane, and the surface of the cell stack 10 facing the inner lining plate 25 is also a plane, so that the inner lining plate 25 and the cell stack 10 have a large contact area, and the surface of the cell stack 10 can be uniformly and stably pressed, which is conducive to improving the stability of the battery module 100.

[0050] In some embodiments of the present application, the elastic modulus of the material used to prepare the spring plate is greater than 100 GPa. In this way, the spring plate can have high strength and can withstand a large range of pressing forces, which is conducive to improving the service life and application scenarios of the spring plate.

[0051] In some embodiments of the present application, referring to FIGS. 2 and 3, the spring plate comprises a first fixed portion 231, a second fixed portion 232, and a connecting portion 233. The first fixed portion 231 and the second fixed portion 232 are oppositely arranged along the length direction thereof, and are movably connected to the first or second pressing plate 21 or 24, respectively. The connecting portion 233 is arranged between the first fixed portion 231 and the second fixed portion 232, and protrudes towards the side where the cell stack 10 is located, and abuts against the surface of the cell stack 10. In this way, when the elastic plate is pressed, the spring plate can deform under the action of the pressing force and move relative to the first or second pressing plate 21 or 24, which is conducive to the stability of the battery module 100 in the embodiments of the present application.

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

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

[0054] Specifically, the first fixed part 231 and the second fixed part 232 are both flat, one side of the second pressing plate 24 facing the battery cell stack 10 is flat, and the first fixed part 231 and the second fixed part 232 are fixedly connected with the one side of the second pressing plate 24 facing the battery cell stack 10. The connecting part 233 protrudes from the side where the battery cell stack 10 is located, and the connecting part 233 includes a plurality of convex parts with a letter "V" shaped cross section.

[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, referring to FIG. 1, one side of the first pressing plate 21 facing the battery cell stack 10 is provided with an insulating buffer layer 26, and the first pressing plate 21 abuts against the battery cell stack 10 through the insulating buffer layer 26. In this way, the steel first pressing plate 21 can be prevented from directly contacting the battery cell stack 10, the first pressing plate 21 is prevented from conducting electricity, and the buffering performance and safety performance of the battery module 100 are improved.

[0057] In some embodiments of the present application, referring to FIG. 1, the module shell 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 height direction H of the battery cell stack 10, and the first pressing plate 21 is fixedly connected with the first end plate 271, the second end plate 272 and the connecting rod 22 respectively. In this way, the structural strength and sealing performance of the module shell are improved.

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

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

[0060] In some embodiments of the present application, referring to FIG. 1, the battery module 100 further comprises a tab connecting plate 28 and a wire harness 29, each of the battery cells 11 is connected with the tab connecting plate 28, and the tab connecting plate 28 is electrically connected with external devices through the wire harness 29.

[0061] In some embodiments of the present application, the first connecting end 221 of the connecting rod 22 is fixedly connected with the first pressing plate 21, the second connecting end 222 of the connecting rod 22 is fixedly connected with the locking member through the second pressing plate 24, and the first pressing plate 21 and the second pressing plate 24 are connected with each other through the connecting member. For example, the torsion force between the second connecting end 222 and the locking member can be adjusted, for example, the torsion force between the second connecting end 222 and the locking member is adjustable between 0.1 N.m and 50 N.m. The locking member extrudes the spring plate through the second pressing plate 24 to deform, for example, the force generated during the deformation of the spring plate is between 10 N and 20000 N, which indirectly acts on the battery cell stack 10 through the inner lining plate 25, and can exert a constant pressure on each of the battery cells 11 in the battery cell stack 10.

[0062] The embodiments of the present application also provide a battery pack comprising at least one battery module 100. Since the battery pack in the embodiments of the present application comprises the above battery module 100, it has the beneficial effects of the battery module 100 described in the present application. For example, the battery pack comprises 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 comprises 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 described here.

[0064] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the detailed description of other embodiments above, which will not be described here.

[0065] Having now described the basic concept of the application, and having shown and described several embodiments of the same, modifications to, and variations of the described embodiments are possible without departing from the spirit of the application, and the application is not limited to the specific embodiments described herein. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation. It is to be understood that various modifications, alternative constructions, and equivalent embodiments can be made in addition to those specifically shown and described herein. It is therefore not the intention that any provisions of the application be limited to the specific embodiments described herein. On the contrary, the intention is to cover all modifications, alternative constructions, and equivalents falling within the spirit and scope of the application.

[0066] Also, the use of "one embodiment," "an embodiment," "a further embodiment," etc., does not necessarily refer to the same embodiment, though it may. In the following description, numerous specific details are discussed, which can be implemented in any embodiment. However, various specific details no not pertain to one or more embodiments. Similarly, some embodiments can be synthesized from what is previously described, others can involve additional or modified steps. Also, to the extent that some drawing figures can possibly suggest otherwise, the descriptions of the various embodiments are not intended to be limiting, but rather as illustrative of how the application can be practiced. It is therefore contemplated to be within the scope of the application to comprise other embodiments not specifically shown, described, or even suggested herein.

[0067] Again, it is noted that the foregoing describes various embodiments of the application, and that changes can be made to these embodiments without departing from the spirit and scope of the application. For example, described features can be combined, removed, and / or modified. Further, described features can be implemented in hardware, software, firmware, or any combination thereof. Accordingly, the scope of the application should not be limited by the descriptions set forth above, but should be given the full scope of the claims below.

[0068] Some embodiments use numerical terms to describe quantities of ingredients, properties, and the like. It is understood that such numerical terms are not intended to limit the application to the particular numerical values recited. For example, as can be apparent from the descriptions, values can have been rounded, for convenience. Further, it is intended that the description of amounts, dimensions, and other numerical terms be understood as modified by a term or terms disclosing the uncertainty of an art understanding or of the precision of manufacture or measurement. That is, unless otherwise specified, "about" can be appended to numerical data described herein, including data in various forms of presentation, such as ranges and dates. Unless otherwise specified, "about" shall convey to one of ordinary skill in the art the precision of the value with which the inventor is associated. That is, the numerical value so described is intended to encompass variations that can exist due to reasonable expected experimental error, production differences, or other factors that result in variations. It is understood that where such values are given, unless otherwise indicated, the inventors have determined such values with certainty within an acceptable level, and or to a degree of certainty which is at least as much as is required for reasonable use of the application.

[0069] The foregoing detailed description of a battery module and battery pack has been presented for purposes of illustration and description. It is understood that numerous variations can be made to the embodiments described herein without departing from the spirit of the application. It is further understood that the application is not limited to the specific embodiments described herein, but instead includes all variations falling within the scope of the application.

Claims

1. A battery module, comprising: Cell stack and module housing; The module housing includes a first pressure plate, a connecting rod, an elastic element, a second pressure plate, and a locking element; The cell stack is formed by stacking multiple cells along the thickness direction; The first pressure plate and the second pressure plate are arranged opposite to each other along the thickness direction of the cell stack, and the cell stack is sandwiched between the first pressure plate and the second pressure plate; The elastic element is disposed between the cell stack and the first pressure plate and / or the second pressure plate; At least one of the first pressure plate and the second pressure plate is sleeved on the connecting rod and can move along the connecting rod to adjust the distance between the first pressure plate and the second pressure plate; The locking member is used to fix the first pressure plate and / or the second pressure plate sleeved on the connecting rod to the connecting rod.

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

3. The battery module as described in claim 2, wherein, Along the thickness direction of the battery cell stack, the connecting rod includes a first connecting end and a second connecting end disposed opposite to each other. The first connecting end is fixedly connected to the first pressure plate. The second pressure plate is provided with a through hole adapted to the second connecting end. The second pressure plate is sleeved on the second connecting end through the through hole and can move along the second connecting end to adjust the distance between the first pressure plate and the second pressure plate. The locking member includes a nut. The second connecting end cooperates with the nut to fix the second pressure plate on the connecting rod.

4. The battery module as described in any one of claims 1 to 3, wherein, The module housing also includes an inner liner plate, which is adapted to the side of the cell stack facing the module. The inner liner plate is disposed between the elastic member and the cell stack. The elastic member includes a spring plate, and the two ends of the spring plate are respectively connected to the inner liner plate and the first pressure plate or the second pressure plate.

5. The battery module as described in claim 4, wherein, The elastic modulus of the material used to prepare the spring plate is greater than 100 GPa.

6. The battery module as described in claim 4, wherein, The materials used to prepare the spring plate include stainless steel, metal alloys, or carbon fiber composite materials.

7. The battery module as described in claim 4, wherein, The spring plate includes a first fixing part, a second fixing part, and a connecting part. The first fixing part and the second fixing part are arranged opposite to each other along their length direction. The first fixing part and the second fixing part are respectively movably connected to the first pressure plate or the second pressure plate. The connecting part is disposed between the first fixing part and the second fixing part and protrudes towards the side where the battery cell stack is located. The connecting part abuts against the side of the battery cell stack facing the stack.

8. The battery module as described in claim 2, wherein, The first pressure plate has an insulating buffer layer on the side facing the cell stack, and the first pressure plate abuts against the cell stack through the insulating buffer layer.

9. The battery module as described in claim 2, wherein, The module housing also includes a first end plate and a second end plate, which are disposed on both sides of the cell stack in the height direction. The first pressure plate is fixedly connected to the first end plate, the second end plate and the connecting rod respectively.

10. The battery module as described in claim 1, wherein, The battery cell is a solid-state battery cell.

11. The battery module as described in claim 1, wherein, The first pressure plate is a metal plate or an alloy plate.

12. The battery module as described in claim 1, wherein, The second pressure plate is a metal plate or an alloy plate.

13. The battery module as described in claim 1, wherein, The battery module also includes a tab connection plate and a wiring harness. Each battery cell is connected to the tab connection plate, and the tab connection plate is electrically connected to an external device through the wiring harness.

14. The battery module as described in claim 3, wherein, The second connecting end is a pin, and the surface of the pin is provided with external threads. The nut cooperates with the pin to fix the second pressure plate on the connecting rod.

15. The battery module as described in claim 7, wherein, Both the first fixing part and the second fixing part are provided with a plurality of guide grooves, and the second pressure plate is provided with a limiting shaft adapted to the guide grooves. The limiting shaft is slidably disposed in the corresponding guide groove.

16. The battery module as described in claim 15, wherein, The guide groove extends along the height direction of the cell stack, and the limiting shaft can slide along the extension direction of the guide groove.

17. The battery module as described in claim 7, wherein, The first fixing part is a plane.

18. The battery module as described in claim 7, wherein, The second fixing part is a plane.

19. The battery module as described in claim 7, wherein, The connecting part includes multiple protrusions with a cross-section in the shape of the letter "V".

20. A battery pack, wherein, The battery pack includes at least one battery module as described in any one of claims 1 to 19.

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