CN219979691U - Fixed frame, battery module and power battery pack - Google Patents

Abstract

The utility model relates to the technical field of new energy, in particular to a fixing frame, a battery module and a power battery pack. According to the fixing frame provided by the utility model, the grooves are formed in the side surfaces of the frame body along the length direction, so that the design redundancy of the wall plates on the two sides of the fixing frame can be removed under the condition that the thickness of the wall plates on the two sides of the fixing frame is unchanged, namely, the woolen at the positions of the grooves is removed, the strength is ensured, the frame is light, and the burden of a battery pack is reduced and the cost is reduced; in addition, the arrangement of the grooves also increases the heat dissipation area of the frame, which is beneficial to improving the heat dissipation efficiency.

Description

Fixed frame, battery module and power battery pack

Technical Field

The utility model relates to the technical field of new energy, in particular to a fixed frame, a battery module and a power battery pack.

Background

In the power battery pack, the smallest unit is an electric core, a group of electric cores form a module, and several modules form a pack, and the module is one of the secondary structures of the power battery system.

In the prior art, a battery module is often independently designed for maintenance, and a single battery module mainly comprises a plurality of single battery cells, a fixed frame, an electric connecting device, a temperature sensor, a voltage detection line and the like, wherein the single battery cells are sequentially and tightly stacked in the fixed frame, and are physically limited through the fixed frame and absorb expansion force from a large surface of the battery cells.

The modules which are designed independently of each other have good maintainability, but are combined with the safety test standard of the battery pack in the market, the whole module has lower vibration resistance, impact resistance and heat radiation capability, and the service life of the battery cell can be directly influenced; in addition, the fixing frame is used for limiting the restraint force of the large surface of the battery cell, and the fixing frame is often required to have a large wall thickness in design so as to ensure that the fixing frame has enough strength to resist expansion and impact, so that the assembled battery pack is more heavy, and inconvenience is brought to transportation.

Disclosure of Invention

The utility model aims at: aiming at the problems that a fixed frame used for restraining the expansion of an electric core in a battery module in the prior art needs to have a large wall thickness to ensure enough strength to perform expansion resistance and impact resistance, and a battery pack after assembly is heavy, the fixed frame, the battery module and the power battery pack are provided.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a fixing frame comprises a frame body, wherein at least one groove is respectively arranged on at least one side surface of two sides of the frame body along the length direction.

According to the fixing frame for restraining the expansion of the battery cells, provided by the utility model, the grooves are formed in at least one side surface of the frame body along the length direction, so that the design redundancy of the wall plates, namely the burrs at the positions of the grooves, can be removed under the condition that the thickness of the wall plates at two sides of the fixing frame is unchanged, the strength is ensured, the frame is light, and the load of a battery pack is reduced and the cost is reduced; in addition, the arrangement of the grooves also increases the heat dissipation area of the frame, which is beneficial to improving the heat dissipation efficiency.

It should be noted that, when the groove is formed on the side surface of the frame, the portion of the side surface adjacent to the groove correspondingly forms a protrusion (the protrusion state is adopted for the groove surface of the groove), the original design thickness is adopted at the position of the formed protrusion, the groove can be regularly arranged or irregularly shaped, and the contour of the groove can be cylindrical, long-strip-shaped, cross-shaped and the like.

Preferably, the groove is rectangular, and the groove sets up along the length direction of frame body or along the direction of height of frame body setting, and the extending direction of groove is unanimous with the length direction or the direction of height of frame body promptly, convenient location processing. In this scheme, the mode that sets up the recess along frame body length direction is best adopted, does benefit to the reduction processing number of times.

Preferably, a plurality of rows of grooves are provided at intervals along the height direction of the frame body. The number of the grooves in each row can be only one or two or more, and the grooves in each row can be vertically arranged, horizontally arranged or obliquely arranged. When setting up the recess, can correspondingly form protruding and this protruding length direction along the frame body that is continuous between the recess of adjacent row, the structure is more reasonable like this, through setting up a plurality of recess of row along the direction of height interval, can make the lateral wall board of frame atress about more even when anti-vibration and impact. The grooves can be in a strip shape, a round shape, other geometric shapes or irregular shapes.

When the grooves of each row are of a continuous structure, the grooves should extend long enough along the length direction of the side wall plate of the frame to better realize the light weight of the frame, and the extending direction (or length direction) of the protrusions and the grooves formed between the grooves of adjacent rows is always consistent; when two or more grooves are arranged at intervals in each row, protrusions are formed between the grooves in the adjacent rows and between the adjacent grooves in each row, so that the anti-pressure device has strong anti-pressure capability.

Further preferably, the grooves of each row are of continuous construction, and each groove is disposed along the length direction of the frame body, i.e., in a transverse direction. Therefore, in the charge and discharge process of the battery, when the battery cell expands, the frame has a stretching trend and a convex trend along the length direction, the scheme can ensure that the side wall plate of the frame still has stronger bending resistance and tensile pressure strength along the expansion direction to resist expansion deformation after the design redundant thickness is removed to the maximum.

Preferably, at least one groove is also arranged on at least one end face of the two ends of the frame body along the length direction, so that the weight of the frame is reduced. In this embodiment, the grooves are also preferably arranged in the horizontal direction, i.e. the grooves on the end faces are arranged in the frame width direction.

Preferably, grooves are formed in two side surfaces of two sides of the frame body along the length direction, and/or grooves are formed in two end surfaces of two ends of the frame body along the length direction, so that the weight of the frame is further reduced, the heat dissipation area is increased, and the heat dissipation efficiency is improved. Further preferably, on at least one pair of opposite faces, the grooves on the opposite side faces are arranged in a staggered manner, and the grooves on one side can be engaged with the protrusions on the corresponding position on the opposite side, so that the frame body can be engaged with the other frame body when stacked, and the up-down displacement and/or the left-right displacement of the two can be limited. The modules are stacked in different horizontal directions as required.

According to the scheme, the grooves are formed in the opposite sides (or opposite ends) A, B of the frame in a staggered mode, the bulges at the corresponding positions of one side of the grooves and the opposite sides can be embedded, when the modules are stacked, the corresponding bulges (or grooves) at the side B of the same frame can be meshed with the corresponding bulges (or bulges) at the side A of the current frame, the effects of absorbing vibration waves, reducing impact force, limiting relative displacement and reducing the volume of a battery pack are achieved, meanwhile, design redundancy can be reduced under the condition that the thickness of a frame body is unchanged, light weight is achieved, and the effects of increasing the heat dissipation area and improving the heat dissipation efficiency of the modules are achieved. When the grooves on one side are embedded with the protrusions on the opposite side, the grooves can be completely matched with the single protrusions on the corresponding positions in size, and two or more protrusions can be embedded at the same groove position.

Preferably, the grooves on one side face are in one-to-one correspondence with the number of protrusions on the opposite side face, and the vibration resistance is good.

Preferably, the height of each protrusion for fitting is smaller or larger than the groove depth of the groove on the opposite side face, so that a gap is formed at the concave-convex engagement portion when the modules are stacked, which facilitates heat dissipation.

Preferably, each of the projections for engagement has a width smaller than that of the groove on the opposite side face, so that cushioning is facilitated.

Preferably, when the two frame bodies are stacked, an upper and lower gap is provided between the protrusion and the groove which are engaged with each other.

On the other hand, the utility model also provides a fixed frame which comprises a frame body, wherein at least one groove is arranged on at least one end face of the two ends of the frame body along the length direction. According to the module stacking direction, grooves are formed in at least one end face of two ends of the frame body in the length direction under a proper scene, so that the design redundancy of the wallboard is removed under the condition that the original design thickness of the fixed frame is kept unchanged, the frame is light, and the burden of a battery pack and the cost are reduced; moreover, the arrangement of the grooves in the scheme also has the effect of increasing the heat dissipation area of the frame and is beneficial to improving the heat dissipation efficiency.

Further preferably, grooves are formed on two end surfaces of the two ends of the frame body along the length direction, and protrusions are correspondingly formed on the two end surfaces provided with the grooves and the positions adjacent to the grooves; the positions of the grooves on the two opposite end surfaces are staggered, and the grooves on one end surface can be embedded with the protrusions on the corresponding positions of the opposite ends, so that the frame body can be clamped and connected with the other frame body along the length direction when the frame is stacked. Therefore, the effects of absorbing vibration waves, reducing impact force, limiting relative displacement and reducing the volume of the battery pack can be achieved, design redundancy can be reduced under the condition that the thickness of the frame body is unchanged, light weight is achieved, and the effects of increasing the heat dissipation area and improving the heat dissipation efficiency of the module are achieved.

In addition, the utility model also provides a battery module, which comprises an electric core and any one of the fixed frames, wherein the electric core is stacked along the length direction of the fixed frame and is filled in the fixed frame; and heat-conducting glue is arranged between adjacent battery cells, so that the bonding degree is improved, and the heat dissipation efficiency is improved.

Preferably, the frame body comprises end plates at two ends and side plates at two sides, and the side plates are welded with the end plates end to end. Compared with the prior art, the method for restraining the expansion of the battery cells through the PET belt adopts the frame body structure to physically limit the expansion of the battery cells, so that the strength is higher and the guarantee is good.

Preferably, buffer foam is arranged between the battery cells and between the end plate and the battery cells, and can fill the reserved installation space and absorb the expansion force of the battery cells in the charging and discharging process.

Based on the above scheme, this embodiment also provides a power battery pack, including at least two battery modules of any one of the above-mentioned structures, pile up each other along length direction and/or width direction between each battery module, and the electricity is connected between the battery modules.

In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:

1. the fixing frame provided by the utility model is used for restraining the expansion of the battery cells, and the design redundancy of the wall plates, namely, the burrs at the positions of the grooves, are removed under the condition that the thickness of the wall plates at the two sides of the fixing frame is unchanged, so that the strength is ensured, the frame is light, and the burden of a battery pack is reduced, and the cost is reduced; in addition, the arrangement of the grooves also increases the heat dissipation area of the frame, which is beneficial to improving the heat dissipation efficiency.

2. According to the fixing frame provided by the utility model, the grooves are arranged on the two sides or the two ends A, B of the length direction of the frame body in a staggered manner, so that when modules are stacked, the purposes of absorbing vibration waves, reducing impact force and limiting relative displacement can be achieved through the engagement of the A-side grooves (or protrusions) of the current frame and the corresponding B-side protrusions (or grooves) of the other frame, and the heat dissipation area is large and the heat dissipation efficiency is high.

3. According to the fixing frame for accommodating the battery cells, the grooves are formed in the two side faces of the frame body in the length direction, and are arranged along the length direction of the frame body, namely, the grooves are arranged along the expansion direction or the stacking direction of the battery cells, so that the frame body reduces design redundancy and realizes light weight under the condition that the thickness is unchanged, and meanwhile, the fixing frame still has strong tensile pressure strength along the expansion direction of the large face of the battery cells to perform expansion constraint and shock resistance, and is good in safety.

4. The battery module is assembled by adopting the fixing frame provided by the utility model, so that the battery pack formed by stacking is light in weight, small in size, stable in structure, fast in heat dissipation and strong in vibration resistance and impact resistance.

Drawings

Fig. 1 is a schematic structural view of a battery module according to embodiment 1;

fig. 2 is an end view of the battery module;

fig. 3 is an enlarged view of a portion a in fig. 2;

fig. 4 is an enlarged view of a portion B in fig. 2;

fig. 5 is a schematic view of a state in which a part of the battery modules are stacked;

fig. 6 is a sectional view of two battery modules when stacked and assembled;

fig. 7 is an enlarged view of a portion C in fig. 6.

Icon: 1-a fixed frame; 2-grooves; 3-bulge; 4-end plates; 5-side plates; and 6-a battery cell.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Example 1

A battery module, as shown in fig. 1 to 4, comprises a battery cell 6 and a fixing frame for accommodating the battery cell 6, a plurality of battery cells 6 are stacked along the length direction of the fixing frame 1 and filled in the fixing frame 1, and the fixing frame 1 is used for restraining the battery cell 6 from expanding. The fixed frame 1 comprises two end plates 4, two side plates 5, a bottom plate and a cover plate, wherein the side plates 5 and the end plates 4 are sequentially enclosed together end to end along the edges of the bottom plate and are welded and connected, after the electric cores are installed, CCS components are electrically connected to the tops of the electric cores, then an upper cover plate is assembled, and the cover plate and the end plates at the two ends are fixed through bolts; a heat-conducting adhesive is arranged between the battery cell 6 and the side plate 5, so that the bonding degree is improved, and the heat dissipation efficiency is improved; buffer foam is arranged between the battery cells 6 and between the end plate 4 and the battery cells 6, and can fill the reserved installation space and absorb the expansion force of the battery cells 6 in the charging and discharging process. Compared with the prior art, the method for restraining the expansion of the battery cell 6 through the PET belt adopts the structure of the fixed frame 1 to physically limit the expansion of the battery cell 6, so that the strength is higher and the guarantee is good.

In order to improve the vibration resistance, impact resistance and heat dissipation capability of the battery module, the present embodiment specifically improves the structure of the fixing frame 1 thereof. Specifically, in this embodiment, grooves 2 are respectively provided on at least one pair of opposite faces of the fixed frame 1, and protrusions 3 are correspondingly formed on the opposite faces of the frame body provided with the grooves 2 at the positions adjacent to the grooves 2, that is, the surfaces of the protrusions 3 are the original machined faces of the fixed frame 1; the positions of the grooves 2 on the two opposite sides are staggered, and the grooves 2 on one side and the protrusions 3 on the corresponding position on the opposite side can be embedded, so that the modules can be in clamping connection with the other fixed frame 1 through the grooves 2 and the protrusions 3 on the frame body when stacked, as shown in fig. 5-7. According to the battery module provided by the embodiment, the grooves 2 are arranged on the two opposite side surfaces A, B of the fixed frame 1 in a staggered manner, so that when the modules are stacked, the grooves 2 (or the protrusions 3) on the side A of the current module can be meshed with the protrusions 3 (or the grooves 2) on the opposite side B of the fixed frame 1 of the other module, the structure is more compact, the volume of the battery pack is reduced, when the battery pack or one module in the battery pack vibrates and impacts, all the modules absorb vibration waves together, the damage of vibration impact to the battery pack is reduced, the relative displacement among the modules is restrained, and the safety is improved; moreover, this scheme is through setting up recess 2 on the body of fixed frame 1, can reduce the design redundancy under the unchangeable circumstances of assurance fixed frame 1 thickness, realizes that structural frame lightweight, reduce cost, and recess 2's setting has increased heat radiating area, does benefit to improvement radiating efficiency to extension electric core 6 life.

Further, in the present embodiment, grooves 2 are respectively provided on both sides of the fixed frame 1 in the longitudinal direction (i.e., in the stacking direction or the expansion direction of the cells 6), and the grooves 2 on both sides are provided along the longitudinal direction of the fixed frame 1. According to the scheme, the grooves 2 are horizontally formed in the two side faces of the fixed frame 1 along the length direction, so that the strength of the fixed frame 1 is ensured while the design redundancy of part of the fixed frame 1 for absorbing the expansion force of the battery cell 6 is removed, and the fixed frame 1 still has higher tensile pressure strength in the length direction to restrain the expansion of the large face of the battery cell 6 and bear vibration impact. Further, the grooves 2 on each side face are provided with a plurality of grooves 2 on the same side face, the grooves 2 on the same side face are arranged at intervals along the height direction of the fixed frame 1 and are arranged continuously along the length direction of the fixed frame 1, correspondingly, the protrusions 3 are formed between the adjacent grooves 2 relatively, the grooves 2 on one side face correspond to the protrusions 3 on the opposite side one by one, the grid area is large, and the heat dissipation efficiency is high.

In this embodiment, on two opposite sides A, B of the frame body, the height of each protrusion 3 on the a side is smaller or larger than the groove depth of the corresponding groove 2 on the opposite side (the B side), that is, the groove depths of the grooves 2 on the two opposite sides are not uniform, so that a transverse gap can be generated at the concave-convex engagement portion when the modules are stacked, which is beneficial to heat dissipation. Moreover, the width of each protrusion 3 on the side A is smaller than the width of the corresponding groove 2 on the side B, and preferably, an up-down gap is formed between the protrusion 3 and the groove 2 which are clamped when the modules are stacked, so that buffering is facilitated, and heat dissipation is facilitated.

According to the battery module provided by the embodiment, the fixed frame 1 is used for physically limiting the expansion force of the battery cell 6, the heat dissipation area is increased, the service life of the battery cell 6 is prolonged, the vibration resistance and impact resistance of the power battery module are improved, the stability and safety of the power battery pack are also improved, the frame can be thinner under the condition of ensuring the strength, the redundant burden is eliminated, the light-weight design is realized, the endurance mileage is improved, and the cost is reduced.

It should be noted that, as other embodiments, the number of the grooves 2 on the body of the fixing frame 1 may be one, or may be two, three, or thirty, which is not particularly limited, and may be reasonably selected according to the process conditions, the heat dissipation efficiency requirements, and the like; and along the length direction of the fixed frame 1, the grooves 2 may be arranged at intervals, and the same groove 2 may be correspondingly embedded with one protrusion 3, two protrusions 3 and more when the modules are clamped and stacked, which is not limited to the above-mentioned exemplary method. In addition, the arrangement of the grooves 2 for the clamping connection of the modules is not limited to the arrangement along the length direction of the fixed frame 1, and the grooves can be arranged on the end plates 4 at the two ends of the fixed frame, and when the modules are stacked, adjacent two modules are connected in the side plate direction and/or the end plate direction through engagement to form a PACK, so that the integrated vibration device is good in integrity, vibration force is absorbed from different directions, and vibration impact force is reduced.

Example 2

The embodiment provides a fixing frame 1, which comprises a frame body, wherein at least one groove 2 is respectively arranged on at least one side surface of two sides of the frame body along the length direction. The fixing frame 1 is used for restraining the expansion of the battery cell 6, so that the design redundancy of the wall plates, namely, the burrs at the positions of the grooves 2, can be removed under the condition that the thickness of the wall plates at the two sides of the fixing frame 1 is unchanged, the strength is ensured, the frame is light, and the load of the battery cell 6 is reduced, and the cost is reduced; furthermore, the arrangement of the grooves 2 also increases the heat dissipation area of the frame, which is beneficial to improving the heat dissipation efficiency.

When the groove 2 is arranged on the side surface of the frame, the part adjacent to the groove 2 on the side surface correspondingly forms a bulge 3 (the bulge 3 is in a state of the groove surface of the groove 2), the original design thickness adopted at the position of the bulge 3 is formed, the groove 2 can be regularly distributed or irregularly shaped, and the outline of the groove 2 can be cylindrical, long-strip-shaped, cross-shaped and the like.

Further, in this embodiment, grooves 2 are formed on both sides of the frame body along the length direction, the grooves 2 on each side are provided with a plurality of rows along the height direction of the frame body at intervals, and each row of grooves 2 is provided along the length direction of the frame body and has only one strip shape. Compare the mode that a plurality of recesses 2 of interval setting and arrange along length direction, this scheme sets up recess 2 along frame body length direction's mode, when battery charge and discharge in-process 6 inflation, frame have tensile trend and evagination trend along length direction, can maximize and get rid of the redundant thickness of design, and simultaneously frame sidewall wallboard still has stronger bending resistance and tensile pressure intensity in along the inflation direction and resists the inflation deformation. Correspondingly, while the grooves 2 are arranged, the protrusions 3 are correspondingly formed between the adjacent grooves 2, the protrusions 3 are continuous along the length direction of the frame body, the structural form design that the grooves 2 are arranged in a plurality of rows at intervals along the height direction is more reasonable, and the side wall plates of the frame are stressed more uniformly during vibration and impact resistance. Moreover, the grooves 2 should extend long enough in the longitudinal direction of the frame side wall plate to better achieve the frame weight reduction, and the protrusions 3 formed between the adjacent rows of the grooves 2 always coincide with the extending direction (or longitudinal direction) of the grooves 2.

Further, in this embodiment, the grooves 2 on the opposite sides are disposed in a staggered manner, wherein the groove 2 on one side can be engaged with the protrusions 3 on the corresponding position on the opposite side, so that the frame body can be engaged with the other frame body during stacking, and the vertical displacement of the two can be restricted. According to the scheme, the grooves 2 are formed in the opposite sides A, B of the frame in a staggered mode, the grooves 2 on one side can be embedded with the protrusions 3 on the corresponding positions on the opposite sides, when the modules are stacked, the grooves 2 (or the protrusions 3) on the side A of the current frame can be meshed with the protrusions 3 (or the grooves 2) on the side B corresponding to the other same frame, the effects of absorbing vibration waves, reducing impact force, limiting relative displacement and reducing the volume of a battery pack are achieved, meanwhile design redundancy can be reduced under the condition that the thickness of a frame body is unchanged, light weight is achieved, and the effects of increasing heat dissipation area and improving heat dissipation efficiency of the modules are achieved. When the groove 2 on one side is embedded with the protrusion 3 on the opposite side, the groove 2 can be completely matched with the size of the single protrusion 3 on the corresponding position, and two or more protrusions 3 can be embedded at the same position of the groove 2. Specifically, in the two opposite sides, the grooves 2 on one side are in one-to-one correspondence with the number of the protrusions 3 on the opposite side, and the height of each protrusion 3 is smaller than or larger than the groove depth of the groove 2 on the opposite side, so that a gap is formed at the concave-convex engagement portion when the modules are stacked, and the width of each protrusion 3 is smaller than the width of the groove 2 on the opposite side, so that a certain buffer interval is provided for vibration resistance, and preferably, an upper gap and a lower gap are reserved between the embedded protrusions 3 and the grooves 2 when the two frame bodies are stacked, so that heat dissipation and vibration resistance are improved.

As other possible embodiments, at least one groove 2 is further provided on at least one end surface of two ends of the frame body along the length direction, so that the weight of the frame is reduced, the heat dissipation area is increased, the heat dissipation efficiency is improved, and the groove 2 can be horizontally arranged, vertically arranged or obliquely arranged.

Example 3

Compared with embodiment 2, the embodiment also provides a fixing frame, which comprises a frame body, wherein at least one groove is formed in at least one end face of two ends of the frame body along the length direction. According to the module stacking direction, grooves are formed in at least one end face of two ends of the frame body in the length direction under a proper scene, so that the design redundancy of the wallboard is removed under the condition that the original design thickness of the fixed frame is kept unchanged, the frame is light, the burden of a battery pack is reduced, and the cost is reduced; moreover, the arrangement of the grooves in the scheme also has the effect of increasing the heat dissipation area of the frame and is beneficial to improving the heat dissipation efficiency.

Further, grooves are formed in two end faces of two ends of the frame body along the length direction, a plurality of rows of grooves are formed in each end face at intervals along the height direction of the frame body, each row of grooves are formed in the width direction of the frame body and are only one long-strip-shaped, accordingly, protrusions are formed at positions adjacent to the grooves correspondingly, stress is good, and when the battery cell expands in the charging and discharging process, and the frame has a stretching trend and a protruding trend along the width direction, the design redundancy thickness is removed, and meanwhile the frame end plate still has strong bending strength along the width direction to resist expansion deformation.

Further, in this embodiment, the positions of the grooves on the opposite end surfaces are staggered, and the grooves on one end surface can be engaged with the protrusions on the corresponding positions of the opposite ends, so that the frame body can be engaged with the other frame body along the length direction during stacking. Therefore, the effects of absorbing vibration waves, reducing impact force, limiting relative displacement and reducing the volume of the battery pack can be achieved, design redundancy can be reduced under the condition that the thickness of the frame body is unchanged, light weight is achieved, and the effects of increasing the heat dissipation area and improving the heat dissipation efficiency of the module are achieved. Specifically, in the two opposite end surfaces, the grooves on one end surface are in one-to-one correspondence with the number of the protrusions on the opposite end surface, and the height of each protrusion is smaller than or larger than the groove depth of the grooves on the opposite end surface, so that gaps are formed at the concave-convex meshing parts when the modules are stacked, the width of each protrusion is smaller than the width of the grooves on the opposite end surface, a certain buffer interval is provided for vibration resistance, and preferably, an upper gap and a lower gap are reserved between the embedded protrusions and the grooves when the two frame bodies are stacked relatively, so that heat dissipation and vibration resistance are improved.

In embodiment 2 and embodiment 3, the side surfaces on both sides in the longitudinal direction of the frame body may be taken as the module stacking surfaces and the end surfaces on both ends in the longitudinal direction of the frame body may be taken as the module stacking surfaces, the arrangement direction of the grooves in each opposite surface is not limited to the horizontal direction, the grooves may be vertically arranged or obliquely arranged, and the arrangement forms of the grooves in the two pairs of opposite side surfaces may be the same or different, and are not limited to the above examples.

Example 4

The present embodiment also provides a power battery pack including at least two of the battery modules of embodiment 1 described above, and the battery frames in the battery modules may be of the modified configurations exemplified in embodiment 2 and embodiment 3. In the power battery pack, the battery modules are stacked one on another in the length direction and/or the width direction, and the battery modules are electrically connected to each other for integrated power supply of the product, as shown in fig. 5. The specific combination mode can be reasonably selected according to application scenes, and the electric connection mode is the prior art and is not described herein.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (17)

1. A fixed frame (1) comprising a frame body, characterized in that at least one groove (2) is respectively arranged on at least one side surface of two sides of the frame body along the length direction.

2. The fixed frame (1) according to claim 1, characterized in that the groove (2) is elongated, the groove (2) being arranged in the length direction of the frame body or in the height direction of the frame body.

3. The fixed frame (1) according to claim 1, characterized in that a number of rows of said grooves (2) are provided at intervals in the height direction of said frame body, the number of said grooves (2) of each row being one or two or more.

4. A fixed frame (1) according to claim 3, characterized in that the grooves (2) of each row are of continuous construction, each groove (2) being arranged along the length of the frame body.

5. A fixed frame (1) according to claim 1, characterized in that at least one of the grooves (2) is provided on at least one of the end faces of the frame body in the length direction.

6. A fixing frame (1) according to any one of claims 1-5, characterized in that the grooves (2) are provided on both sides of the frame body in the length direction, and/or that the grooves (2) are provided on both end surfaces of the frame body in both ends in the length direction.

7. A fixing frame (1) according to claim 6, characterized in that protrusions (3) are formed on the side provided with the grooves (2) at the positions adjacent to the grooves (2), the grooves (2) on the opposite sides being arranged in a staggered manner in at least one pair of opposite sides and wherein one side of the grooves (2) is capable of being engaged with the protrusions (3) on the opposite side at the corresponding positions.

8. The fixed frame (1) according to claim 7, characterized in that the grooves (2) on one side correspond one-to-one to the positions and number of the protrusions (3) on the opposite side.

9. A fixing frame (1) according to claim 7, characterized in that the height of each of the protrusions (3) for fitting is smaller or larger than the groove depth of the corresponding groove (2) on the opposite side.

10. A fixing frame (1) according to claim 7, wherein each of said projections (3) for fitting has a width smaller than the width of the corresponding recess (2) on the opposite side.

11. A fixed frame (1) according to claim 10, characterized in that the projection (3) and the recess (2) which are fitted together have an up-down gap therebetween when the frame body is stacked with another frame body.

12. The fixed frame (1) comprises a frame body and is characterized in that at least one groove (2) is formed in at least one end face of two ends of the frame body in the length direction.

13. The fixed frame (1) according to claim 12, wherein the two end surfaces of the two ends of the frame body along the length direction are provided with the grooves (2), and the two end surfaces provided with the grooves (2) are provided with the corresponding protrusions (3) at the positions adjacent to the grooves (2); the positions of the grooves (2) on the two opposite end surfaces are staggered, and the grooves (2) on one end surface can be embedded with the protrusions (3) on the corresponding positions of the opposite ends.

14. A battery module characterized by comprising a battery cell (6) and a fixed frame (1) according to any one of claims 1 to 13, the battery cell (6) being stacked in the length direction of the fixed frame (1) and filled in the fixed frame (1).

15. The battery module according to claim 14, wherein the fixed frame (1) comprises end plates (4) at both ends and side plates (5) at both sides, and the side plates (5) are welded end to end with the end plates (4); and a heat-conducting adhesive is arranged between the battery cell (6) and the side plate (5).

16. The battery module according to claim 15, wherein buffer foam is provided between adjacent cells (6) and between the end plate (4) and the cells (6).

17. A power battery pack comprising at least two battery modules according to any one of claims 14 to 16, wherein the battery modules are stacked on each other in a longitudinal direction and/or a width direction, and the battery modules are electrically connected to each other.