Battery module
By applying pretension force to the battery cell using elastic components in the battery module, the pressure problem caused by cell expansion is solved, the battery cell service life is extended and the production cost is reduced, while providing buffer space to avoid deformation.
Patent Information
- Application Number
- CN202420737533.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-10
AI Technical Summary
During the charging and discharging cycle of the battery module, the internal expansion of the battery cell causes an increase in pressure, affecting the cycle life of the battery cell.
The elastic components apply pretension force to the battery cell. By providing a mounting groove and elastic components in the box, the elastic components are inserted between the end plate and the groove wall to tighten the battery cell assembly and provide pretension force to resist expansion. , and strengthen the stability and heat dissipation of the battery cell through structures such as restraints, liquid-cooled plates and thermal glue pads.
Effectively reduce the expansion of the battery cell, extend the service life of the battery cell, reduce production costs, and provide buffer space through elastic components to avoid deformation caused by hard extrusion.
Smart Images
Figure CN222282167U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery module. Background Art
[0002] With the continuous development of new energy vehicles, power batteries used to power new energy vehicles have also been widely used. At present, battery modules usually use multiple single cells to assemble a battery pack, and the battery pack is encapsulated in a dedicated battery box. However, after the battery pack is assembled into the battery box, as the charge and discharge cycle proceeds, the gas generated inside the battery cell expands, and the internal space of the battery box is limited, resulting in increased pressure between the battery cells, affecting the cycle life of the battery cell. Utility Model Content
[0003] The purpose of the embodiment of the utility model is to provide a battery module, which can apply a pre-tightening force to the battery cell through an elastic component, and the internal structure of the battery cell has good stability.
[0004] To achieve this purpose, the present invention adopts the following technical solutions:
[0005] A battery module is provided, comprising a box body, a battery cell assembly and an elastic component, wherein the box body is recessed to form a mounting groove; the battery cell assembly comprises a plurality of battery cells arranged side by side along a first direction and end plates respectively located at the outermost sides of the battery cells along the first direction, the battery cell assembly is arranged in the mounting groove, and the end plates are spaced apart from the groove wall of the mounting groove; the elastic component is inserted between the end plates and the groove wall of the mounting groove, and the elastic component is always pressed against the battery cell assembly.
[0006] As a preferred solution of the battery module, the battery module also includes a mounting beam, two of the mounting beams are arranged in the mounting groove along the first direction at intervals, the length of the mounting beam extends along the second direction, the first direction and the second direction are arranged at an angle, the battery cell assembly is arranged between the two mounting beams and spaced apart from the mounting beams, and the elastic component is respectively pressed against the mounting beam and the end plate.
[0007] As a preferred solution of the battery module, the battery module also includes a restraining member, and the elastic component has an initial state and a pressing state. In the initial state, the restraining member is wrapped around the outside of the elastic component to constrain the size of the elastic component along the first direction; in the pressing state, the elastic component is freed from the restraint of the restraining member to press against the battery cell assembly.
[0008] As a preferred solution of the battery module, the restraining member comprises a plastic bag, the elastic component is installed in the plastic bag, and the plastic bag is compressed and sealed to constrain the size of the elastic component; or,
[0009] The restraining member includes a binding belt that binds the elastic member to restrict the size of the elastic member.
[0010] As a preferred solution for the battery module, the end plate is provided with an avoidance groove for clamping by an external clamping tool, and the length of the avoidance groove extends along a third direction, and the third direction is arranged at an angle with the first direction.
[0011] As a preferred solution of the battery module, the battery module further includes a baffle, the avoidance groove penetrates through the end plate and forms a notch on a side away from the battery cell, and the baffle is used to block the notch.
[0012] As a preferred solution of the battery module, the elastic component includes foam, and the foam abuts against the end plate.
[0013] As a preferred solution of the battery module, the battery module further comprises a liquid cooling plate, and the liquid cooling plate is arranged on a side of the battery cell assembly away from the bottom of the mounting groove.
[0014] As a preferred solution of the battery module, the battery module further includes a thermally conductive adhesive pad, and the thermally conductive adhesive pad is arranged between the liquid cooling plate and the battery core assembly.
[0015] As a preferred solution of the battery module, the battery module further includes a positioning member for limiting the installation position of the battery cell assembly, and the positioning member is arranged at the bottom of the installation groove.
[0016] The beneficial effects of the embodiments of the utility model are as follows: through the provision of the elastic component, a pre-tightening force can be applied to the battery cell assembly, so that the battery cell can resist the expansion caused by charging and discharging, reduce the expansion of the battery cell, and ensure the cycle life of the battery cell; and the elastic component has a simple structure and is easy to produce and assemble, which effectively reduces the production cost of the battery module; the elastic component has a certain elasticity, and while providing a pre-tightening force for the battery cell assembly, it can also provide a certain buffer space for the battery cell assembly, thereby avoiding the deformation of the battery cell caused by excessive squeezing force due to hard abutment. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The utility model is further described in detail below based on the drawings and embodiments.
[0018] Figure 1 It is a schematic structural diagram of a battery module according to an embodiment of the utility model.
[0019] Figure 2 for Figure 1 An enlarged schematic diagram of point A.
[0020] Figure 3 It is a top view of a battery module according to an embodiment of the present utility model.
[0021] Figure 4 It is a schematic diagram of the coordination of the mounting beam, elastic component and battery core assembly according to an embodiment of the utility model.
[0022] In the figure:
[0023] 1. Box body; 11. Mounting groove; 2. Battery cell assembly; 21. Battery cell; 22. End plate; 221. Avoidance groove; 3. Elastic component; 4. Mounting beam. DETAILED DESCRIPTION
[0024] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0027] like Figure 1 and Figure 2As shown, the battery module of the embodiment of the utility model includes a box body 1, a battery cell assembly 2 and an elastic component 3, the box body 1 is recessed to set a mounting groove 11; the battery cell assembly 2 includes a plurality of battery cells 21 arranged side by side along a first direction and end plates 22 located at the outermost sides of the battery cells 21 along the first direction (the first direction is the X direction shown in the figure), that is, all the battery cells 21 are arranged side by side to form a core package, and the two end plates 22 are respectively arranged on both sides of the core package along the first direction, the battery cell assembly 2 is arranged at the bottom of the mounting groove 11, and the end plate 22 is spaced apart from the groove wall of the mounting groove 11; the elastic component 3 is inserted between the end plate 22 and the groove wall of the mounting groove 11, and the elastic component 3 is always pressed against the battery cell assembly 2 to apply a pre-tightening force to the battery cell assembly 2. By setting the elastic component 3, a pre-tightening force can be applied to the battery cell assembly 2, so that the battery cell 21 can resist the expansion caused by charging and discharging, reduce the expansion of the battery cell 21, ensure the structural stability of the internal winding layer of the battery cell 21, and thus ensure the cycle service life of the battery cell 21; and the elastic component 3 has a simple structure and is easy to produce and assemble, which effectively reduces the production cost of the battery module; the elastic component 3 has a certain elasticity, which provides a pre-tightening force for the battery cell assembly 2, and can also provide a certain buffer space for the battery cell assembly 2, so as to avoid the situation where the rigid abutment causes excessive squeezing force on the battery cell 21 and causes deformation.
[0028] It is understandable that the battery cell 21 is provided with an explosion-proof valve, and a waterproof breathable membrane is provided on the explosion-proof valve. Under the pre-tightening action of the elastic component 3, a certain pressing force can be generated between the battery cells 21, so that the exhaust gas generated during the charging and discharging process of the battery cell 21 can be squeezed out from the waterproof breathable membrane, reducing the expansion of the battery cell 21, effectively ensuring the structural stability of the battery cell 21, and improving the service life of the battery module.
[0029] Alternatively, if Figure 2 , Figure 3 and Figure 4 As shown, the battery module also includes a mounting beam 4, two mounting beams 4 are arranged in the mounting groove 11 along the first direction, the length of the mounting beam 4 extends along the second direction (the second direction is the Y direction shown in the figure), the first direction and the second direction are arranged at an angle, the battery cell assembly 2 is arranged between the two mounting beams 4 and is arranged at an interval from the mounting beam 4, and the elastic component 3 is respectively pressed against the mounting beam 4 and the end plate 22. The mounting beam 4 is fixed to the bottom of the mounting groove 11, and even the two ends of the mounting beam 4 in the length direction can be connected to the groove wall of the mounting groove 11. Through the arrangement of the mounting beam 4, on the one hand, the structural strength of the box body 1 can be strengthened, and the structural stability of the bottom of the box body 1 can be improved, thereby ensuring that the box body 1 supports the battery cell assembly 2, and on the other hand, the elastic component 3 is prevented from directly contacting the groove wall of the box body 1, so as to prevent the box body 1 from being affected by a collision, thereby affecting the elastic component 3 and thus affecting the restraint stability of the elastic component 3 on the battery cell 21.
[0030] Furthermore, if Figure 1 , Figure 3and Figure 4 As shown, in the present embodiment, two battery cell assemblies 2 are arranged in the box body 1 of the battery module at intervals along the first direction. A fixed beam can be further arranged between the two battery cell assemblies 2. The length of the fixed beam extends along the first direction, which can also play a role in strengthening the structural strength of the box body 1 and can space two adjacent battery cell assemblies 2 to reduce the impact between them.
[0031] Furthermore, the battery module also includes a liquid cooling plate, which is arranged on the side of the bottom of the battery cell assembly 2 away from the mounting groove 11, and the liquid cooling plate is detachably connected to the mounting beam 4. By setting the liquid cooling plate, the heat dissipation of the battery cell assembly 2 can be enhanced to prevent the safety of the battery cell 21 from being affected by excessive temperature during the use of the battery cell 21. And the liquid cooling plate is arranged above the battery cell assembly 2, which can reduce the damage to the liquid cooling plate caused by the bottom collision during the use of the car, and the liquid cooling plate is located at the notch of the mounting groove 11, which is convenient for the maintenance and replacement of the liquid cooling plate in the future, that is, relative to setting the liquid cooling plate at the bottom of the mounting groove 11, this design can directly disassemble the box 1 to carry out the maintenance and replacement of the liquid cooling plate, which is convenient and quick. For example, a through hole is arranged on the liquid cooling plate, and a threaded hole is arranged on the fixed beam. The bolt passes through the through hole and is screwed into the threaded hole to complete the connection between the liquid cooling plate and the fixed beam. The threaded connection is convenient for disassembly and assembly, and the connection is stable.
[0032] Preferably, the battery module further includes a thermally conductive pad, which is disposed between the liquid cooling plate and the battery cell assembly 2. The thermally conductive pad can effectively enhance the conduction of heat from the battery cell 21, accelerate the heat dissipation of the battery cell 21, and ensure the safety of the battery cell 21; at the same time, it can avoid the wear of the liquid cooling plate and the battery cell 21 caused by the rigid contact between the liquid cooling plate and the battery cell 21.
[0033] In this embodiment, the elastic component 3 includes foam, and the foam abuts against the end plate 22. The foam can provide a good abutting force, and the rigidity is not too large and the elasticity is not too small. The foam can be microporous foamed polypropylene foam, irradiation cross-linked polypropylene foam or foamed silicone foam, etc., which can be placed in a set position after being compressed and released, and the structure is simple and easy to operate.
[0034] Optionally, the battery module further includes a binding member, and the elastic member 3 has an initial state and a tight state. In the initial state, the binding member is coated on the outside of the elastic member 3 to constrain the size of the elastic member 3 along the first direction; in the tight state, the elastic member 3 is free from the binding member to press against the battery cell assembly 2. In this embodiment, the binding member can be a vacuum plastic bag, and the mounting beam 4 and the end plate 22 are vertically arranged, that is, the foam can be a square structure to ensure the contact area between the foam and the mounting beam 4 and the end plate 22. Through vacuum treatment, the foam can be compressed along the first direction, and the compressed foam is placed between the mounting beam 4 and the end plate 22. The vacuum plastic bag is cut, and the foam absorbs air and can be released along the first direction, so that the foam is pressed against the mounting beam 4 and the end plate 22 on both sides along the first direction. It should be noted that the vacuum plastic bag can be made of some materials with strong flame retardancy to avoid the occurrence of accelerated explosion when a fault occurs inside the battery cell 21. Through the setting of the binding member, the placement of the elastic member 3 is facilitated, and the convenience of installing the elastic member 3 is improved. In other embodiments, the restraining member includes a strapping tape, which is used to strap the elastic component 3 to constrain the size of the elastic component 3. The compressed foam is placed between the mounting beam 4 and the end plate 22 and then the strapping tape is cut to release the foam. The strapping tape has a simple structure and is easy to use.
[0035] Furthermore, if Figure 2 , Figure 3 and Figure 4 As shown, the end plate 22 is provided with an avoidance groove 221 for clamping by an external clamping tool, and the length of the avoidance groove 221 extends along the third direction (the third direction is the Z direction shown in the figure), and the third direction is set at an angle with the first direction. When the battery cell assembly 2 is assembled, the pre-tightening force between the battery cells 21 will be applied by the pre-tightening machine during the manufacturing process, and then transferred to the box body 1 through the additional tooling until the elastic component 3 replaces the tooling to press against the battery cell assembly 2. Therefore, by setting the avoidance groove 221, it is possible to avoid the elastic component 3 from contacting with the additional tooling, which causes the movement of the elastic component 3 when the tooling is separated, and effectively ensure the installation stability of the elastic component 3. It should be noted that in this embodiment, there are three avoidance grooves 221, and the three avoidance grooves 221 are arranged at intervals along the second direction. The battery cell assembly 2 is clamped by a three-claw clamping tooling, and the clamping stability is high.
[0036] Furthermore, the battery module further includes a baffle, and the avoidance groove 221 penetrates the end plate 22 and forms a notch on the side away from the battery cell 21, and the baffle is used to block the notch. The baffle can effectively prevent the foam from passing through the notch of the avoidance groove 221 and abutting against the tooling, and can ensure that the foam still has a pre-tightening force on the notch position of the avoidance groove 221, so that the force at various locations of the end plate 22 is relatively balanced, and avoid the avoidance groove 221 not being pressed by the foam, resulting in uneven force on the end plate 22 and structural damage.
[0037] Preferably, the battery module also includes a positioning member for limiting the installation position of the battery cell assembly 2, and the positioning member is arranged at the bottom of the installation groove 11. By setting the positioning member, the installation accuracy of the battery cell assembly 2 can be enhanced, thereby ensuring the spacing between the end plate 22 and the installation beam 4, and ensuring the overall structural stability of the battery module. In this embodiment, the positioning member is made of structural adhesive, and the structural adhesive is adhered to the bottom of the installation groove 11. By using the edge of the battery cell assembly 2 and the structural adhesive to be arranged relative to each other, the installation position of the battery cell assembly 2 is ensured. At the same time, the structural adhesive can also play the role of adhering the battery cell assembly 2, thereby improving the connection strength of the battery cell assembly 2.
[0038] In the description of this article, it is necessary to understand that the terms "upper", "lower", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0039] In the description of this specification, the description of reference term "an embodiment" etc. means that the specific features, structures, materials or characteristics of the embodiment are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment.
[0040] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
[0041] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.
Claims
1. A battery module, characterized in that: include: A box body, wherein the box body is recessed to form a mounting groove; A battery cell assembly, the battery cell assembly comprising a plurality of battery cells arranged side by side along a first direction and end plates respectively located at the outermost sides of the battery cells along the first direction, the battery cell assembly being arranged in the mounting groove, and the end plates being spaced apart from the groove wall of the mounting groove; An elastic component is inserted between the end plate and the groove wall of the mounting groove, and the elastic component always presses against the battery core assembly.
2. The battery module according to claim 1, characterized in that: It also includes a mounting beam, wherein two mounting beams are arranged in the mounting groove along the first direction at intervals, the length of the mounting beam extends along the second direction, the first direction and the second direction are arranged at an angle, the battery cell assembly is arranged between the two mounting beams and spaced apart from the mounting beams, and the elastic components are respectively pressed against the mounting beam and the end plate.
3. The battery module according to claim 1, characterized in that: It also includes a restraining member, and the elastic member has an initial state and a pressing state. In the initial state, the restraining member is wrapped around the outside of the elastic member to constrain the size of the elastic member along the first direction; in the pressing state, the elastic member is free from the restraint of the restraining member to press against the battery cell assembly.
4. The battery module according to claim 3, characterized in that: The restraining member comprises a plastic bag, the elastic component is installed in the plastic bag, and the plastic bag is compressed and sealed to restrict the size of the elastic component; or, The restraining member includes a binding belt that binds the elastic member to restrict the size of the elastic member.
5. The battery module according to any one of claims 1 to 4, characterized in that: The end plate is provided with an avoidance groove for clamping by an external clamping tool, and the length of the avoidance groove extends along a third direction, and the third direction is arranged at an angle with the first direction.
6. The battery module according to claim 5, characterized in that: It also includes a baffle, the avoidance groove passes through the end plate and is formed with a notch on a side away from the battery core, and the baffle is used to block the notch.
7. The battery module according to any one of claims 1 to 4, characterized in that: The elastic component includes foam, and the foam abuts against the end plate.
8. The battery module according to any one of claims 1 to 4, characterized in that: It also includes a liquid cooling plate, which is arranged on a side of the battery core assembly away from the bottom of the installation groove.
9. The battery module according to claim 8, characterized in that: It also includes a thermally conductive adhesive pad, which is arranged between the liquid cooling plate and the battery core assembly.
10. The battery module according to any one of claims 1 to 4, characterized in that: It also includes a positioning member for limiting the installation position of the battery cell assembly, and the positioning member is arranged at the bottom of the installation groove.