Battery cell shell and battery cell

Abstract

The utility model relates to battery manufacturing technical field provides a kind of battery shell and battery, battery shell includes shell main body, shell main body includes a pair of first side wall and a pair of second side wall, first side wall and second side wall are enclosed to form the chamber for accommodating pole group, and the area of first side wall is greater than second side wall;At least one side wall in the first side wall is integrated with the liquid cooling channel for cooling the pole group inside, and the liquid cooling channel is used to cool the pole group;Wherein, liquid cooling channel has liquid inlet port and liquid outlet port, and liquid inlet port and liquid outlet port are located at least one end of shell main body in length direction.The utility model is integrated with liquid cooling channel on the side wall of shell main body, realizes cooling inside by liquid cooling channel, realizes the efficient heat dissipation of battery, and the internal space of battery pack can be optimized by the mode of integrated liquid cooling channel, the occupation of condensing plate to the internal space of battery pack is avoided, so that the overall structure is more compact.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a cell housing and a cell. Background Technology

[0002] As the market share of new energy vehicles gradually increases, energy storage systems are also increasingly sought after by the market. In the context of the continuous expansion of new energy, the battery cell is one of the smallest units of all new energy. New energy vehicles and energy storage cannot do without the support of battery cell technology, and the heat dissipation problem of the battery cell has become a bottleneck for new energy.

[0003] Generally, complex and diverse electrochemical reactions occur inside a battery cell during charging and discharging. As the charge / discharge rate and cycle increase, the internal resistance of the cell also increases, leading to increased heat generation and temperature. When the temperature exceeds the cell's limit, causing thermal runaway, the cell may experience various hazards such as leakage, fire, and explosion. Therefore, heat dissipation of the battery cell itself has become an urgent technical challenge. To address this issue, a battery cell casing is provided that effectively dissipates heat from the battery cell. Utility Model Content

[0004] This utility model provides a battery cell housing and a battery cell to solve the defects of the prior art where the heat dissipation capacity of a single battery cell is limited and the condenser plate itself occupies a large space.

[0005] This utility model provides a battery cell housing, comprising: a housing body, the housing body including a pair of first sidewalls and a pair of second sidewalls, the first sidewalls and the second sidewalls enclosing a cavity for accommodating an electrode assembly, and the area of ​​the first sidewalls being larger than that of the second sidewalls; at least one of the first sidewalls has an integrated liquid cooling channel for cooling the electrode assembly, the liquid cooling channel being configured to cool the electrode assembly in the cavity; wherein, the liquid cooling channel has an inlet port and an outlet port, the inlet port and the outlet port being located at at least one end of the housing body in the length direction.

[0006] According to the battery cell housing of this utility model, the inner wall of the liquid cooling channel is provided with a heat-conducting structure protruding towards the inside of the channel.

[0007] According to the battery cell housing of this utility model, the liquid cooling channel includes a rectangular channel, and the heat-conducting structure is integrally formed on the side wall of the rectangular channel near the chamber.

[0008] According to the battery cell housing of this utility model, the heat-conducting structure includes grid-shaped fins.

[0009] According to the battery cell housing of this utility model, along the thickness direction of the housing body, the channel diameter width of the liquid cooling channel is L, and the extension height L1 of the heat-conducting structure protrusion ranges from 0.5L < L1 < L.

[0010] According to the battery cell housing of this utility model, the liquid cooling channel includes a serpentine channel, and the heat-conducting structure is disposed in the straight section of the serpentine channel.

[0011] According to the battery cell housing of this utility model, along the thickness direction of the housing body, the projected length of the heat-conducting structure is equal to the length of the straight section of the serpentine channel.

[0012] According to the present invention, in the length direction of the main body of the battery cell, the liquid inlet port and the liquid outlet port are respectively located at opposite ends of the main body of the battery cell, and in the width direction of the main body of the battery cell, the liquid inlet port and the liquid outlet port are respectively located on opposite sides of the main body of the battery cell.

[0013] According to the battery cell housing of this utility model, the liquid cooling channels on the two opposite inner walls of the first side wall are symmetrically arranged.

[0014] This utility model also provides a battery cell, comprising: a battery cell housing as described above, wherein electrode posts are respectively provided on opposite sides of the housing body, and in the width direction of the housing body, both the liquid inlet port and the liquid outlet port are flush with the electrode posts.

[0015] The battery cell housing and battery cell provided by this utility model achieve efficient heat dissipation of the battery cell by integrating liquid cooling channels on the side wall of the housing body, thereby cooling the internal components. Furthermore, the integrated liquid cooling channels optimize the internal space of the battery pack, avoiding the space occupied by condenser plates and resulting in a more compact overall structure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the battery cell housing provided by this utility model.

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the battery cell housing provided by this utility model.

[0019] Figure 3This utility model provides Figure 2 A magnified structural diagram of point A in the middle.

[0020] Figure label: 10. Shell body; 11. First side wall; 12. Second side wall; 13. Liquid cooling channel; 131. Liquid inlet port; 132. Liquid outlet port; 133. Thermal conduction structure; 14. Electrode. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0024] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] Batteries, as the power source for electronic products, are widely used and indispensable in social life. Global fossil fuel reserves are finite, and the environmental problems caused by the overuse of fossil fuels have sounded an alarm for energy use. On the one hand, it is necessary to develop and utilize renewable energy sources to reduce dependence on fossil fuels; on the other hand, it is essential to control and harmlessly treat the harmful substances generated by fossil fuel consumption. To address these issues, the trend in related technologies is to replace existing fossil fuels with electricity to power automobiles. With the continuous promotion of electric vehicles, the demand for electric vehicles is increasing, and as one of the most important components of new energy vehicles, the design of safe and stable battery cells is crucial.

[0027] During battery use, the cells typically generate significant heat due to internal chemical reactions. Current technologies often utilize cooling structures within the battery pack to dissipate heat from the cells. However, this method is slow and ineffective at quickly cooling individual cells. Furthermore, incorporating condenser plates within the battery pack occupies considerable space.

[0028] Regarding the problems in related technologies, such as Figures 1-3As shown, this utility model provides a battery cell housing, including a housing body 10. The housing body 10 includes a pair of first sidewalls 11 and a pair of second sidewalls 12. The first sidewalls 11 and the second sidewalls 12 enclose a cavity for accommodating an electrode assembly, and the area of ​​the first sidewall 11 is larger than that of the second sidewall 12. At least one of the first sidewalls 11 has an integrated liquid cooling channel 13 for cooling the electrode assembly. The liquid cooling channel 13 is used to cool the electrode assembly. The liquid cooling channel 13 has an inlet port 131 and an outlet port 132, which are located at least one end of the housing body 10 in the length direction. The battery cell is the smallest energy storage unit in the battery pack. During use, it undergoes charging and discharging processes. During these processes, the battery cell generates a large amount of heat, which is transferred outward through the housing. In this embodiment, by integrating a liquid cooling channel 13 on the sidewall of the housing body 10, internal cooling is achieved through the liquid cooling channel 13, thus realizing efficient heat dissipation of the battery cell.

[0029] Specifically, the first sidewall 11 and the second sidewall 12 enclose a chamber for accommodating the electrode assembly, so that the overall structure of the shell body 10 is a flat square shell. The liquid cooling channel 13 is located in the two sidewalls of the larger surface of the shell to achieve cooling of the electrode assembly inside the cell. The liquid inlet port 131 and the liquid outlet port 132 are connected to the external coolant circulation system through conduits or connecting pipes to achieve coolant circulation, thereby removing internal heat during the coolant circulation process.

[0030] The liquid cooling circulation system includes necessary components such as a circulation pipeline for coolant flow, a cooling device, and a drive pump. The circulation pipeline is used to connect with the liquid cooling channel 13 and form a closed loop, so that the coolant can be driven by the drive pump to flow in the circulation pipeline. During the flow, the coolant carries away the heat in the electrode column, which in turn carries away the heat of the battery cell, thus achieving effective heat dissipation of the battery cell.

[0031] Furthermore, in a specific configuration, a liquid cooling channel 13 can be formed by integrating condenser tubes within the first sidewall 11. The condenser tubes are made of insulated tubing, effectively preventing safety issues such as leakage in the circulation pipeline. The cooling medium can also be an insulated medium, such as insulating oil, electrolyte coolant, or other insulating liquids. Using an insulated cooling medium further improves the overall insulation of the liquid cooling system.

[0032] Understandably, compared to the traditional approach of setting a condenser plate inside the battery pack, this embodiment integrates the liquid cooling channel 13 onto a larger side wall. This not only frees up space inside the battery pack, making the overall structure more compact and facilitating battery pack expansion, but also allows the liquid cooling channel 13 to directly exchange heat with the internal components, improving the cooling effect and facilitating cell temperature control.

[0033] In some embodiments, such as Figure 2 As shown, the inner wall of the liquid cooling channel 13 is provided with a heat-conducting structure 133 protruding towards the inside of the channel. The heat-conducting structure 133 can improve the heat exchange efficiency of the battery cell, making it cool down faster.

[0034] Specifically, the heat-conducting structure 133 uses a heat-conducting material with good thermal conductivity, such as silicon nitride, aluminum nitride, graphite, or thermally conductive plastic. This good thermal conductivity improves the heat exchange rate and increases the contact area with the coolant in the channel, thereby further enhancing heat exchange efficiency and enabling rapid temperature control.

[0035] It is understandable that by constructing a heat-conducting structure 133 inside the liquid cooling channel 13, heat transfer is facilitated, enabling rapid cooling of the internal temperature of the battery cell.

[0036] In specific configurations, the heat-conducting structure 133 can be a void-shaped heat-conducting structure 133 or a raised plate-shaped heat-conducting structure 133; that is, any structure that can increase the contact area with the coolant is acceptable.

[0037] In some embodiments, such as Figure 2 As shown, the liquid cooling channel 13 includes a rectangular channel, and the heat-conducting structure 133 is integrally formed on the side wall of the rectangular channel near the cavity. By placing the heat-conducting structure 133 on the side near the cavity, the heat exchange efficiency can be further improved, enabling rapid heat exchange inside the battery cell.

[0038] Specifically, the heat-conducting structure 133 is used to achieve heat exchange between the internal temperature and the coolant, and its stability is improved by integral molding. For example, it can be integrally molded by die casting, injection molding, 3D printing or welding. The integral molding method makes the heat-conducting structure 133 more stable and more stable in the flow of coolant.

[0039] It is understandable that the temperature inside the battery cell diffuses from the chamber to the sidewall. In this embodiment, the heat-conducting structure 133 is integrally formed on the sidewall of the liquid cooling channel 13, which reduces the heat diffusion path and improves the heat transfer efficiency from the heat source to the coolant, achieving rapid heat transfer and increasing the rate at which the temperature inside the chamber decreases. On the other hand, the integrated design improves structural stability and simplifies the assembly process of the heat-conducting structure 133, thereby increasing production efficiency.

[0040] In conjunction with the above embodiments, the heat-conducting structure 133 includes grid-shaped fins. By defining it as grid-shaped fins, it has a larger heat exchange area, enabling rapid heat transfer and increasing the temperature reduction rate within the chamber.

[0041] Specifically, the grid-like fins protrude from one side of the inner wall of the channel and extend toward the channel. The flow path of the fluid between the fins can be optimized, reducing flow resistance and improving the flow efficiency of the coolant. Furthermore, the thermal conductivity and shape design of the fins can be optimized, allowing heat to be transferred more effectively from the heat source to the liquid cooling channel 13.

[0042] Furthermore, compared to traditional radiators, grille-shaped fins can be designed to be lighter and thinner while ensuring heat dissipation, making the overall structure lighter and improving the product's portability and application flexibility.

[0043] In some embodiments, such as Figure 3 As shown, along the thickness direction of the shell body 10, the channel diameter of the liquid cooling channel 13 is L, and the extension height L1 of the protruding part of the heat-conducting structure 133 ranges from 0.5L < L1 < L. By limiting the height of the protruding part, the heat dissipation performance, fluid flow characteristics, and mechanical stability of the entire liquid cooling system can be effectively improved, so that it can take into account both the flow rate of the coolant and the heat exchange efficiency.

[0044] Specifically, the heat-conducting structure 133 is a grid-like fin. The height of the protrusion affects its heat exchange efficiency with the coolant, and also affects the flow resistance of the coolant in the channel, thus affecting the flow velocity of the coolant. In this embodiment, by limiting the height of the protrusion, a balance can be achieved between the coolant flow velocity and the heat exchange efficiency.

[0045] Understandably, an appropriate height of the heat-conducting structure 133 can optimize the flow characteristics of the fluid in the channel, prevent turbulence in a small space, thereby improving the overall flow stability and efficiency and reducing flow resistance. When the height of the heat-conducting structure 133 exceeds half the channel diameter (0.5L), it can effectively prevent the accumulation of coolant in the channel, reduce local overheating caused by slow liquid flow, and provide a larger contact area, thus giving it higher heat exchange efficiency.

[0046] In a preferred embodiment, the extension height L1 of the protruding portion of the heat-conducting structure 133 is 0.7L. By limiting the extension height of the protruding portion of the heat-conducting structure 133, the heat exchange efficiency and coolant flow are both in a better state, which can further improve the cooling effect of the battery cell.

[0047] In some embodiments, the liquid cooling channel 13 includes a serpentine channel, and the heat-conducting structure 133 is disposed within the straight section of the serpentine channel. The serpentine channel provides a larger contact area with the inner cavity, which improves heat exchange efficiency and enables rapid cooling of the battery cell.

[0048] Specifically, the serpentine channel has a tortuous structure, which increases the time the cooling medium spends flowing within the channel, allowing for sufficient heat exchange with the interior of the chamber and improving its heat exchange efficiency.

[0049] Understandably, the serpentine channel is a meandering flow channel structure that can achieve effective and uniform coverage of the chamber, improve cooling uniformity, and increase the heat exchange time between the coolant and the chamber, thus achieving rapid internal cooling.

[0050] In specific configurations, the density of the serpentine channel arrangement is positively correlated with the cell's heat generation coefficient; that is, the higher the cell's heat generation coefficient, the greater the density of the serpentine channel arrangement. Of course, the density of the serpentine channel arrangement can also be adjusted according to different cell sizes and systems, improving the flexibility of its configuration.

[0051] Wherein, the cell heat generation coefficient = a * serpentine channel arrangement density * coolant flow rate * thermal conductivity of heat-conducting structure 133; where a is a constant. That is, the higher the cell heat generation system, the higher the internal heat. In this case, matching and control can be achieved by adjusting at least one of the serpentine channel arrangement density, coolant flow rate, and thermal conductivity of heat-conducting structure 133, thereby enabling rapid heat dissipation.

[0052] In some embodiments, along the length of the housing body 10, the inlet port 131 and the outlet port 132 are located at opposite ends of the housing body 10, and along the width of the housing body 10, the inlet port 131 and the outlet port 132 are located on opposite sides of the housing body 10. By defining the positions of the inlet port 131 and the outlet port 132, the flow of coolant can be facilitated, thereby improving its heat dissipation capacity.

[0053] Specifically, the relative positions of the inlet port 131 and the outlet port 132 create a relatively straight fluid flow path. This configuration also prevents localized overheating and ensures that the overall temperature of the device remains within an ideal range.

[0054] It is understandable that, compared to placing the inlet port 131 and the outlet port 132 at the same end, setting them at opposite ends can effectively reduce flow resistance and increase the flow rate of the coolant, thereby improving cooling efficiency.

[0055] In some embodiments, the liquid cooling channels 13 on the two opposing inner walls within the first sidewall 11 are symmetrically arranged. This symmetrical arrangement enables uniform heat dissipation on both sides of the battery cell, improving its heat dissipation efficiency and resulting in better heat dissipation.

[0056] Specifically, the first sidewall 11 includes two sidewalls arranged on both sides along the thickness direction of the shell body 10. Both sidewalls are constructed with liquid cooling channels 13, which cool the internal chamber. This symmetrical arrangement can achieve uniform coverage of the cooling range and avoid high local temperature differences.

[0057] This utility model also provides a battery cell, including: the battery cell housing provided above, with electrode posts 14 respectively provided on opposite sides of the housing body 10, and in the width direction of the housing body, the liquid inlet port 131 and the liquid outlet port 132 are both flush with the electrode posts 14.

[0058] Specifically, the shell body 10 has a positive terminal and a negative terminal on opposite sides. The port at the positive terminal is the liquid inlet port 131, and the port at the negative terminal is the liquid outlet port 132. Of course, the liquid inlet port 131 can also be located at the negative terminal.

[0059] It is understandable that the battery cell generates a large amount of heat during charging and discharging, and this heat is mainly concentrated at the terminal post 14. Furthermore, there is typically a gap between the terminal post 14 and the inner wall of the housing body 10 in the width direction, resulting in low overall efficiency for arranging cooling channels in this space. In this embodiment, by limiting the liquid inlet / outlet ports 132 to a position flush with the terminal post 14 in the width direction, waste of the liquid cooling channel 13 can be effectively avoided, saving the arrangement area of ​​the liquid cooling channel 13, reducing the manufacturing cost of the liquid cooling channel 13, and effectively ensuring good heat dissipation performance.

[0060] The battery cell provided in this embodiment has the battery cell housing of any of the aforementioned embodiments. Therefore, the battery cell in this embodiment has the characteristic effects of each of the aforementioned battery cell housings. To avoid redundancy in the effect description, it will not be repeated here.

[0061] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment integrates a liquid cooling channel 13 on the side wall of the main body 10, thereby achieving internal cooling and efficient heat dissipation of the battery cell. Furthermore, integrating the liquid cooling channel 13 optimizes the internal space of the battery pack, avoids the condenser plate occupying internal space, and makes the overall structure more compact.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell housing, characterized in that, include: The shell body includes a pair of first sidewalls and a pair of second sidewalls, the first sidewalls and the second sidewalls enclosing a cavity for accommodating the pole assembly, and the area of ​​the first sidewalls is larger than that of the second sidewalls; At least one of the first sidewalls has an integrated liquid cooling channel for cooling the electrode assembly, the liquid cooling channel being configured to cool the electrode assembly within the chamber; The liquid cooling channel has an inlet port and an outlet port, which are located at at least one end of the shell body in the length direction.

2. The cell housing according to claim 1, characterized in that, The inner wall of the liquid cooling channel is provided with a heat-conducting structure that protrudes towards the inside of the channel.

3. The cell housing according to claim 2, characterized in that, The liquid cooling channel includes a rectangular channel, and the heat-conducting structure is integrally formed on the side wall of the rectangular channel near the chamber.

4. The cell housing according to claim 2, characterized in that, The heat-conducting structure includes grid-like fins.

5. The cell housing according to claim 2, characterized in that, Along the thickness direction of the shell body, the channel diameter width of the liquid cooling channel is L, and the extension height L1 of the heat-conducting structure protrusion ranges from 0.5L < L1 < L.

6. The cell housing according to claim 2, characterized in that, The liquid cooling channel includes a serpentine channel, and the heat-conducting structure is disposed within the straight section of the serpentine channel.

7. The cell housing according to claim 6, characterized in that, Along the thickness direction of the shell body, the projected length of the heat-conducting structure is equal to the length of the straight section of the serpentine channel.

8. The cell housing according to claim 1, characterized in that, Along the length of the shell body, the inlet port and the outlet port are located at opposite ends of the shell body, and along the width of the shell body, the inlet port and the outlet port are located on opposite sides of the shell body.

9. The cell housing according to claim 1, characterized in that, The liquid cooling channels are symmetrically arranged on the two opposing inner walls within the first sidewall.

10. A battery cell, characterized in that, include: According to any one of claims 1-9, the battery cell housing is provided with electrode posts on opposite sides of the housing body, and the liquid inlet port and the liquid outlet port are flush with the electrode posts in the width direction of the housing body.

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