Battery cell module and battery pack

Abstract

The utility model provides a battery cell module, comprising: an outer frame provided with a clamping groove and a binding surface deviating from the clamping groove; the battery cell assembly is fixed in the clamping groove, the battery cell assembly comprises a tab led out from the battery cell assembly, and the tab extends out of the clamping groove and is folded on the binding surface; wherein the tab is provided with a pre-folding line, the pre-folding line is used for enabling the corner of the tab to be a round corner when the tab is folded, and the sum of the thickness of the tab and the thickness of the battery cell is equal to the thickness of the outer frame when the tab is observed in the thickness direction of the battery cell module. The utility model further provides a battery pack which comprises the battery cell module. According to the battery cell module and the battery pack provided by the invention, the tabs are folded in the manner of the pre-folding lines and are arranged on the binding surfaces, so that the total thickness of the tabs and the battery cells is ensured to be just equal to the thickness of the outer frame. According to the scheme, thickness increase possibly caused by additional parts is avoided, and the structural compactness and the integration degree of the battery cell module are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell module and a battery cell module. Background Art

[0002] As a basic component of modern battery technology, the battery cell is the basic unit for storing and releasing electrical energy. In an electrochemical battery, the battery cell is usually composed of a positive electrode, a negative electrode, an electrolyte, and a separator. These components work together to generate electric current through chemical reactions to provide energy for various electronic devices. There are various types of battery cells, including but not limited to lithium-ion batteries, nickel-metal hydride batteries, and lead-acid batteries, each of which has its own characteristics in terms of energy density, number of charge and discharge cycles, stability, and cost.

[0003] With the widespread use of mobile devices and portable electronic products, the market demand for small, high-energy-density batteries is growing. In response to this demand, battery manufacturers have been exploring more efficient cell miniaturization solutions. These solutions include using higher energy-density materials, optimizing battery design to reduce the volume of inactive components, and improving battery assembly technology to reduce space waste. Among them, lithium-ion cells have become the mainstream choice due to their high energy density and long cycle life. Through these methods, manufacturers can reduce the size and weight of cells while maintaining or enhancing cell performance, meeting the needs of modern electronic devices for lightness and efficiency.

[0004] However, in the process of miniaturization of battery cells, a common technical problem is the processing of the tabs. The tabs are the conductive parts of the battery cell for external connection, and they usually need to be folded during the battery cell assembly process to fit into the limited space. To ensure reliable connection and avoid internal short circuits, the tabs must have a preset length sufficient for folding. This design requirement poses a challenge to the overall thickness of the battery cell module, because the folded edge of the preset length will increase the overall thickness of the battery cell module. This is in conflict with the market demand for thinner battery modules. Therefore, how to effectively handle the tabs to reduce the overall thickness of the battery cell module while ensuring the safety and reliability of the battery cell has become a major technical challenge in the field of battery design and manufacturing. Utility Model Content

[0005] In view of this, it is necessary to provide a cell module and a cell module that can prevent the cell thickness from increasing due to the bending of the tabs, so as to solve the above problems.

[0006] An embodiment of the present application provides a battery cell module, including:

[0007] An outer frame is provided with a clamping groove and a fitting surface facing away from the clamping groove;

[0008] A battery cell assembly is fixed in the clamping groove, and the battery cell assembly includes a pole ear extending therefrom, the pole ear extends from the clamping groove and folded onto the fitting surface;

[0009] The pole ear has a pre-folding line for rounding its corner when the pole ear is folded. When observed along the thickness direction of the battery cell module, the sum of the thickness of the pole ear and the thickness of the battery cell is equal to the thickness of the outer frame.

[0010] In at least one embodiment of the present application, the battery cell assembly includes a first battery cell and a second battery cell that are stacked and arranged in series;

[0011] The first battery cell includes a first electrode tab extending therefrom, and the second battery cell includes a second electrode tab extending therefrom;

[0012] Among them, the first pole ear includes a first connecting portion and a first folding portion arranged on the first connecting portion, and a first pre-folding line is arranged between the first connecting portion and the first folding portion; the second pole ear includes a second connecting portion and a second folding portion arranged on the second connecting portion, and a second pre-folding line is arranged between the second connecting portion and the second folding portion.

[0013] In at least one embodiment of the present application, the outer frame includes a main body and a platform portion provided on the main body and located at opposite ends of the battery cell assembly;

[0014] The main body and the platform are combined to form the clamping groove, and the fitting surface is arranged on the end surface of the platform away from the clamping groove.

[0015] In at least one embodiment of the present application, the platform portion is provided with a fixing groove connected to the clamping groove, and the pole ear extends from the clamping groove along the fixing groove and is attached to the attaching surface.

[0016] In at least one embodiment of the present application, the tab welding is arranged on the bonding surface.

[0017] In at least one embodiment of the present application, the battery cell module further includes a fixing member;

[0018] The fixing member is disposed in the fixing groove, and is used for holding the pole ear in the fixing groove when the pole ear is extended and abutted against the abutting surface.

[0019] In at least one embodiment of the present application, the battery cell module further includes a heat sink;

[0020] The heat sink is disposed between the first battery core and the second battery core;

[0021] There are two fixing members, and along the length direction of the battery core assembly, the two fixing members are respectively arranged in the fixing grooves of the outer frame, and the two ends of the heat sink are respectively fixed on the two fixing members.

[0022] In at least one embodiment of the present application, the fixing member includes a supporting portion and a clamping portion;

[0023] The abutting portion is disposed in the fixing groove and is used to abut the tab against the inner wall of the fixing groove;

[0024] The clamping part is arranged toward the battery core assembly, and a clamping groove is formed in the clamping part, and the heat sink is clamped in the clamping part.

[0025] In at least one embodiment of the present application, when observed along the thickness direction of the outer frame, the height of the supporting portion is equal to the height of the fixing groove.

[0026] A battery pack comprises the battery cell module as described above.

[0027] The battery cell module and battery pack provided above ensure that the total thickness of the tab and the battery cell is exactly equal to the thickness of the outer frame by folding the tab in a pre-folding line and arranging it on the fitting surface. The above solution not only avoids the increase in thickness caused by additional components, but also improves the structural compactness and integration of the battery cell module. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the three-dimensional structure of a battery cell module in one embodiment of the present application.

[0029] Figure 2 for Figure 1 An exploded view of the battery module is shown.

[0030] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the battery cell assembly is shown.

[0031] Figure 4 for Figure 1 The cross-sectional view of the battery cell module along the AA direction is shown.

[0032] Main component symbols

[0033] 100, battery cell module; 10, outer frame; 10a, clamping groove; 10b, fitting surface; 11, main body; 12, platform; 12a, fixing groove; 20, battery cell assembly; 21, pole ear; 21a, pre-folding line; 22, first battery cell; 22a, first pole ear; 221, first connecting portion; 222, first folding portion; 23, second battery cell; 23a, second pole ear; 231, second connecting portion; 232, second folding portion; 30, fixing member; 31, supporting portion; 32, engaging portion; 32a, engaging groove; 40, heat sink. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0035] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "located on" another component, it may be directly located on the other component or there may be a central component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0036] An embodiment of the present application provides a battery cell module, including:

[0037] An outer frame is provided with a clamping groove and a fitting surface facing away from the clamping groove;

[0038] A battery cell assembly is fixed in the clamping groove, and the battery cell assembly includes a pole ear extending therefrom, the pole ear extends from the clamping groove and folded onto the fitting surface;

[0039] The pole ear has a pre-folding line for rounding its corner when the pole ear is folded. When observed along the thickness direction of the battery cell module, the sum of the thickness of the pole ear and the thickness of the battery cell is equal to the thickness of the outer frame.

[0040] An embodiment of the present application also provides a battery pack, comprising the battery cell module as described above.

[0041] The battery cell module and battery pack provided above ensure that the total thickness of the tab and the battery cell is exactly equal to the thickness of the outer frame by folding the tab in a pre-folding line and arranging it on the fitting surface. The above solution not only avoids the increase in thickness caused by additional components, but also improves the structural compactness and integration of the battery cell module.

[0042] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0043] Embodiment 1

[0044] See also Figure 1-Figure 4 , an embodiment of the present application provides a battery cell module 100, comprising:

[0045] The outer frame 10 is provided with a clamping groove 10a and a fitting surface 10b facing away from the clamping groove 10a;

[0046] The battery cell assembly 20 is fixed in the clamping groove 10a, and the battery cell assembly 20 includes a pole ear 21 extending therefrom, and the pole ear 21 extends from the clamping groove 10a and is folded on the fitting surface 10b;

[0047] The pole ear 21 has a pre-folding line 21 a for rounding the corner of the pole ear 21 when it is folded. When observed along the thickness direction of the battery cell module 100 , the sum of the thickness of the pole ear 21 and the thickness of the battery cell is equal to the thickness of the outer frame 10 .

[0048] It should be noted that by ensuring that the sum of the thickness of the tab 21 and the thickness of the cell is equal to the thickness of the outer frame 10, the design optimizes space utilization, making the entire cell module 100 more compact in the thickness direction. This is especially important for applications that require miniaturization and lightness, such as portable electronic devices, electric vehicles, or any space-constrained occasions.

[0049] Furthermore, the design of the tab 21 includes a pre-folding line 21a, so that a rounded corner is formed when folded, which not only helps to reduce stress concentration points, thereby improving the structural stability and durability of the tab 21, but also helps to prevent damage to the battery cell or performance degradation.

[0050] Furthermore, the solution improves the overall integration of the battery module 100 by effectively arranging the tabs 21 in a limited space. This may help to increase the energy density of the battery, so that the battery module 100 can store more energy in a smaller space.

[0051] Furthermore, the manufacturing and assembly process of the battery cell module 100 is simplified. The preset folding lines and folding methods reduce the complexity of assembly, which may reduce the manufacturing cost and the error rate during assembly.

[0052] Furthermore, the compact design and improved structural stability help to improve the safety of the battery cell module 100, because the more stable structure can better withstand physical impact or environmental stress, thereby reducing potential failure risks.

[0053] In summary, the design of the battery cell module 100 improves space utilization efficiency, stability and safety through its compact structural design while maintaining the battery cell performance, and is suitable for a variety of scenarios that require efficient and compact power solutions.

[0054] In a specific embodiment, the battery cell assembly 20 includes a first battery cell 22 and a second battery cell 23 which are stacked and arranged in series;

[0055] The first battery cell 22 includes a first pole tab 22a21 extending therefrom, and the second battery cell 23 includes a second pole tab 23a21 extending therefrom;

[0056] Among them, the first pole ear 22a21 includes a first connecting portion 221 and a first folding portion 222 arranged on the first connecting portion 221, and a first pre-folding line 21a (not shown in the figure) is arranged between the first connecting portion 221 and the first folding portion 222; the second pole ear 23a21 includes a second connecting portion 231 and a second folding portion 232 arranged on the second connecting portion 231, and a second pre-folding line 21a (not shown in the figure) is arranged between the second connecting portion 231 and the second folding portion 232.

[0057] It should be noted that the stacking and series configuration of the first battery cell 22 and the second battery cell 23 allows the battery cell assembly 20 to achieve a higher energy density within a limited space. This configuration helps to increase the overall voltage and capacity of the battery pack, because connecting the batteries in series increases the overall voltage, and the stacking layout helps to save space.

[0058] Furthermore, each battery cell has its own tab 21, which includes a connecting portion and a folding portion, and a pre-folding line 21a located between the connecting portion and the folding portion. This design allows the tab 21 to be effectively fixed and connected to the battery cell without adding additional volume, while providing additional flexibility and stability.

[0059] Furthermore, the pre-folding line 21a is designed so that the tab 21 forms a rounded corner when it is folded. Compared with a right angle, when the tab 21 of the same area is folded into a right angle or a rounded corner, the height of the rounded corner is lower than that of the right angle. Therefore, after the pre-folding line 21a is set to fold into a rounded corner, the protruding height of the tab 21 is reduced, thereby reducing the overall thickness.

[0060] Furthermore, it should be noted that a certain area of ​​the tab 21 needs to be reserved for folding. When the reserved area of ​​the tab 21 is small, it is often difficult to fold the tab 21 due to the small area.

[0061] Furthermore, through the tabs 21, the battery cell is more stable and reliable in terms of electrical connection and physical layout, which is crucial to maintaining the long-term performance and safety of the battery pack.

[0062] In summary, the above-mentioned battery cell assembly 20 design not only optimizes the space and energy density, but also improves the overall structural stability and reliability of the battery through its innovative tab 21 design.

[0063] In a specific embodiment, the outer frame 10 includes a main body 11 and a platform 12 disposed on the main body 11 and located at opposite ends of the battery cell assembly 20;

[0064] It should be noted that the main body 11 and the platform 12 enclose the clamping groove 10a, and the fitting surface 10b is provided on the end surface of the platform 12 away from the clamping groove 10a. The main body 11 of the outer frame 10 and the platform 12 form the clamping groove 10a, which provides a stable support and fixation for the battery cell assembly 20.

[0065] The above solution is helpful to maintain the stability and anti-shake of the battery cell assembly 20 during use, especially in application scenarios with movement or large vibration.

[0066] Furthermore, the platform 12 not only supports the structure of the main body 11, but also provides additional support and protection for both ends of the battery cell assembly 20. The end surface of the platform 12 away from the clamping groove 10a is provided with a fitting surface 10b for the position of additional components, thereby increasing the flexibility of the design of the battery cell module 100.

[0067] Furthermore, the presence of the clamping groove 10a ensures that the battery cell assembly 20 can be firmly fixed in the outer frame 10, reducing the movement or displacement of the battery cell assembly 20 during operation. This is essential for maintaining the physical integrity of the battery cell and the stability of the electrical connection, especially under long-term use or extreme conditions.

[0068] Furthermore, the combination design of the main body 11 and the platform 12 improves the structural strength and durability of the entire battery module 100. The above solution is conducive to protecting the battery cell from the influence of the external environment, such as impact, temperature change, etc.

[0069] In summary, the outer frame 10 design of the battery cell module 100 of the above scheme not only provides a stable fixation and protection for the battery cell assembly 20 by cleverly combining the main body 11 and the platform 12, but also improves the structural strength and durability of the entire module, which is crucial to ensuring the long-term performance and safety of the battery cell module 100.

[0070] In a specific embodiment, the platform portion 12 is provided with a fixing groove 12 a communicating with the clamping groove 10 a , and the tab 21 extends from the clamping groove 10 a along the fixing groove 12 a and is attached to the attaching surface 10 b .

[0071] It should be noted that the presence of the fixing groove 12a provides a clear path for the tab 21 to smoothly extend from the clamping groove 10a. The above solution ensures the guidance and protection of the tab 21 during the extension process, reducing potential damage risks, especially during assembly and transportation.

[0072] Furthermore, the tab 21 extends along the fixing groove 12a and fits on the fitting surface 10b. Such a layout not only makes the battery module 100 more compact, but also helps to ensure a stable electrical connection between the tab 21 and the battery assembly 20. Through precise positioning, the above solution helps to maintain the overall structural and functional stability of the battery module 100.

[0073] Furthermore, by fixing the tab 21 at a designed position, the integration and reliability of the battery module 100 can be improved. This improvement in integration is crucial to the performance and life of the battery module 100, especially in applications that require highly stable and reliable power solutions.

[0074] Furthermore, the platform 12 with the fixing groove 12a simplifies the assembly process of the battery module 100 because it provides clear guidance, making the placement and fixing of the tab 21 more direct and easy. This not only helps to reduce assembly time, but also may reduce manufacturing and maintenance costs.

[0075] In a specific embodiment, the tab 21 is welded onto the bonding surface 10 b.

[0076] It should be noted that by welding the pole lug 21 to the fitting surface 10b, the pole lug 21 is avoided from being connected by screws, thereby reducing the area of ​​the pole lug 21 occupied by the large cross-section of the nut, thereby preventing the problem of the battery cell assembly 20 becoming thicker due to the nut.

[0077] In a specific embodiment, the battery cell module 100 further includes a fixing member 30 ; the fixing member 30 is disposed in the fixing groove 12 a , and is used to hold the pole ear 21 in the fixing groove 12 a when the pole ear 21 extends out and fits on the fitting surface 10 b .

[0078] It should be noted that the presence of the fixing member 30 ensures the stability of the tab 21 in the battery cell module 100 and prevents the tab 21 from moving or loosening due to vibration or impact during use.

[0079] Furthermore, by holding the tab 21 with the fixing member 30 , it is possible to ensure that the electrical connection between the tab 21 and the fitting surface 10 b is more reliable. Such a reliable connection helps to reduce resistance and improve the overall electrical efficiency of the battery module 100 .

[0080] Furthermore, the fixing member 30 not only stabilizes the position of the tab 21 , but also plays a certain protective role, preventing the tab 21 from being physically damaged during assembly, transportation or use.

[0081] In a specific embodiment, the fixing member 30 is substantially a block-shaped structure.

[0082] In a specific embodiment, the battery cell module 100 also includes a heat sink 40; the heat sink 40 is disposed between the first battery cell 22 and the second battery cell 23; there are two fixing members 30, and along the length direction of the battery cell assembly 20, the two fixing members 30 are respectively disposed in the fixing groove 12a of the outer frame 10, and the two ends of the heat sink 40 are respectively fixed on the two fixing members 30.

[0083] It should be noted that the heat sink 40 is generally a heat sink structure, which is used to dissipate the heat generated by the first battery cell 22 and the second battery cell 23 when they are in use, so as to increase the service life of the first battery cell 22 and the second battery cell 23 .

[0084] In a specific embodiment, the fixing member 30 includes a resisting portion 31 and a clamping portion 32;

[0085] The abutting portion 31 is disposed in the fixing groove 12a, and is used to abut the pole ear 21 against the inner wall of the fixing groove 12a;

[0086] The engaging portion 32 is disposed toward the battery core assembly 20 , and a engaging groove 32 a is defined in the engaging portion 32 . The heat sink 40 is engaged in the engaging portion 32 .

[0087] It should be noted that the abutting portion 31 is located in the fixing groove 12a, and is used to firmly abut the tab 21 against the inner wall of the fixing groove 12a. The above arrangement ensures the stability of the tab 21 in the battery module 100, and prevents possible movement or vibration during operation.

[0088] Further, the snap-fit ​​portion 32 is disposed toward the cell assembly 20 and has a snap-fit ​​groove 32a, which provides a mechanism to fix the heat sink 40. The snap-fit ​​installation of the heat sink 40 helps maintain the thermal stability of the cell module 100, which is critical to the efficiency and life of the cell.

[0089] Furthermore, the battery cell module 100 can more effectively manage internal heat by fixing the heat sink 40 with the snap-fit ​​portion 32. The effective fixing and position arrangement of the heat sink 40 ensures that the heat can be evenly distributed and effectively dissipated, reducing the risk of overheating.

[0090] In a specific embodiment, when viewed along the thickness direction of the outer frame 10 , the height of the abutting portion 31 is equal to the height of the fixing groove 12 a .

[0091] It should be noted that the height of the abutment portion 31 is completely matched with the fixing groove 12a, which means that the abutment portion 31 can completely fill the fixing groove 12a, providing the best support and stability for the tab 21. This tight fit helps to reduce any shaking or displacement of the tab 21 during use, especially in transportation or vibration environments.

[0092] Furthermore, when the height of the abutting portion 31 is consistent with the height of the fixing groove 12 a , the stress can be evenly distributed over the entire contact surface, which helps to reduce material fatigue or damage caused by concentrated stress and improve the long-term durability of the battery module 100 .

[0093] Furthermore, the production process is easy to control and manufacture, which helps to reduce manufacturing costs and improve production efficiency. The perfect match between the supporting portion 31 and the fixing groove 12a in height further enhances the overall structural integrity of the battery module 100. The above solution ensures the stability and durability of the battery module 100 when facing various physical and environmental challenges.

[0094] In summary, the equal height design of the abutment portion 31 and the fixing groove 12a provides additional stability and uniform stress distribution for the battery cell module 100, simplifies the design and manufacturing process, and improves the integrity and durability of the overall structure. These characteristics are crucial for the reliable operation of the high-performance battery cell module 100.

[0095] The cell module 100 and the battery pack provided above ensure that the total thickness of the cell tab 21 and the cell is exactly equal to the thickness of the outer frame 10 by folding the tab 21 along the pre-folding line 21a and arranging it on the fitting surface 10b. The above solution not only avoids the increase in thickness due to additional components, but also improves the structural compactness and integration of the cell module 100.

[0096] Embodiment 2

[0097] The second embodiment provides a battery pack, including the battery cell module 100 as described in the first embodiment.

[0098] It should be noted that the battery pack in the second embodiment includes the battery cell module 100 in the first embodiment. Therefore, the second embodiment includes all the beneficial effects of the battery cell module 100 in the first embodiment, which will not be repeated here.

[0099] The above is only an implementation method of the present application. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present application, but these improvements are within the scope of protection of the present application.

Claims

1. A battery cell module, characterized in that: include: An outer frame is provided with a clamping groove and a fitting surface facing away from the clamping groove; A battery cell assembly is fixed in the clamping groove, and the battery cell assembly includes a pole ear extending therefrom, the pole ear extends from the clamping groove and folded onto the fitting surface; The pole ear has a pre-folding line for rounding its corner when the pole ear is folded. When observed along the thickness direction of the battery cell module, the sum of the thickness of the pole ear and the thickness of the battery cell is equal to the thickness of the outer frame.

2. The battery cell module according to claim 1, characterized in that: The battery cell assembly comprises a first battery cell and a second battery cell which are stacked and arranged in series; The first battery cell includes a first electrode tab extending therefrom, and the second battery cell includes a second electrode tab extending therefrom; Among them, the first pole ear includes a first connecting portion and a first folding portion arranged on the first connecting portion, and a first pre-folding line is arranged between the first connecting portion and the first folding portion; the second pole ear includes a second connecting portion and a second folding portion arranged on the second connecting portion, and a second pre-folding line is arranged between the second connecting portion and the second folding portion.

3. The battery cell module according to claim 2, characterized in that: The outer frame includes a main body and a platform portion provided on the main body and located at opposite ends of the battery core assembly; The main body and the platform are combined to form the clamping groove, and the fitting surface is arranged on the end surface of the platform away from the clamping groove.

4. The battery cell module according to claim 3, characterized in that: The platform portion is provided with a fixing groove connected to the clamping groove, and the pole ear extends from the clamping groove along the fixing groove and is attached to the attaching surface.

5. The battery cell module according to claim 4, characterized in that: The tab is welded on the bonding surface.

6. The battery cell module according to claim 4, characterized in that: The battery core module also includes a fixing member; The fixing member is disposed in the fixing groove, and is used for holding the pole ear in the fixing groove when the pole ear is extended and abutted against the abutting surface.

7. The battery cell module according to claim 6, characterized in that: The battery core module also includes a heat sink; The heat sink is disposed between the first battery core and the second battery core; There are two fixing members, and along the length direction of the battery core assembly, the two fixing members are respectively arranged in the fixing grooves of the outer frame, and the two ends of the heat sink are respectively fixed on the two fixing members.

8. The battery cell module according to claim 7, characterized in that: The fixing member comprises a supporting portion and a clamping portion; The abutting portion is disposed in the fixing groove and is used to abut the tab against the inner wall of the fixing groove; The clamping part is arranged toward the battery core assembly, and a clamping groove is formed in the clamping part, and the heat sink is clamped in the clamping part.

9. The battery cell module according to claim 8, characterized in that: When viewed along the thickness direction of the outer frame, the height of the supporting portion is equal to the height of the fixing groove.

10. A battery pack, characterized in that: Comprising a battery cell module as described in any one of claims 1-9.

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