Battery cell and battery pack

Abstract

The utility model discloses electric core technical field provides a kind of electric core and battery pack, including electric core body, positive pole and negative pole are equipped with on the top cover of electric core body with interval;The inside of positive pole and negative pole is formed with inner cavity, and insulated liquid cooling pipe is equipped in inner cavity;Wherein, inlet and outlet are opened on the side wall of inner cavity, insulated first communicating pipe is equipped at inlet, insulated second communicating pipe is equipped at outlet, first communicating pipe is connected with the inlet port of liquid cooling pipe, and second communicating pipe is connected with the outlet port of liquid cooling pipe.The utility model is equipped with liquid cooling pipe in the pole of positive pole and negative pole, and liquid cooling pipe is used to take away the heat inside in the process of cooling liquid flow, to realize the effective cooling of electric core monomer.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, and in particular to a battery cell and battery pack. 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, we present a battery cell that effectively dissipates heat from the terminals and the cell itself. Utility Model Content

[0004] This invention provides a battery cell and battery pack to solve the problem of limited heat dissipation capacity of battery cells in the prior art.

[0005] This utility model provides a battery cell, comprising: a battery cell body, on the top cover of the battery cell body being provided with a positive electrode post and a negative electrode post spaced apart; both the positive electrode post and the negative electrode post having an inner cavity, and an insulating liquid cooling tube being provided in the inner cavity; wherein, an inlet and an outlet are provided on the side wall of the inner cavity, an insulating first connecting pipe is provided at the inlet, and an insulating second connecting pipe is provided at the outlet, the first connecting pipe being connected to the inlet port of the liquid cooling tube, and the second connecting pipe being connected to the outlet port of the liquid cooling tube.

[0006] According to the battery cell provided by this utility model, the liquid cooling tubes in the positive electrode post and the negative electrode post are connected in series through connecting pipes.

[0007] The battery cell provided by this utility model also includes a liquid cooling box, which is disposed on the top cover between the positive electrode post and the negative electrode post. The liquid cooling box has a serpentine flow channel inside. The side wall of the liquid cooling box has a first connection port and a second connection port. The first connection port is connected to the liquid cooling pipe in the positive electrode post, and the second connection port is connected to the liquid cooling pipe in the negative electrode post.

[0008] According to the battery cell provided by this utility model, both the first connection port and the second connection port are provided with a one-way valve.

[0009] According to the battery cell provided by this utility model, the liquid cooling box is an insulating liquid cooling box.

[0010] According to the battery cell provided by this utility model, a support frame is provided between the positive terminal and the negative terminal, and a fan is provided on the support frame.

[0011] According to the battery cell provided by this utility model, the liquid cooling box is located inside the support frame, and the air outlet of the fan is arranged facing the liquid cooling box.

[0012] According to the battery cell provided by this utility model, the liquid cooling tube is constructed as a serpentine tube or a U-shaped tube structure.

[0013] According to the battery cell provided by this utility model, insulating gaskets are provided at the parts where the positive and negative terminals mate with the top cover.

[0014] This utility model also provides a battery pack, including: a liquid cooling system; and the battery cell provided above, wherein the liquid cooling system is connected to a liquid cooling tube on each of the battery cells.

[0015] The battery cell and battery pack provided by this utility model have liquid cooling pipes installed in the positive and negative terminals of the battery cell. The liquid cooling pipes are used to remove the heat inside the cell during the flow of coolant, thereby achieving effective cooling of the individual battery cell. 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 provided by this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of the positive electrode post in the battery cell provided by this utility model.

[0019] Figure 3 This is a schematic diagram of the internal structure of the liquid cooling box in the battery cell provided by this utility model.

[0020] Figure label: 10. Battery cell body; 11. Top cover; 20. Positive terminal; 21. Inner cavity; 22. Liquid inlet; 23. Liquid outlet; 30. Negative terminal; 40. Liquid cooling box; 41. Flow channel; 42. First connection port; 43. Second connection port; 44. One-way valve; 50. Support frame; 51. Fan; 60. Insulating gasket; 70. Liquid cooling pipe; 71. First connecting pipe; 72. Second connecting pipe. 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] During battery use, the battery cells generate significant heat due to internal chemical reactions. In related technologies, heat dissipation is often achieved by placing the cells on the cooling structure of the battery pack. However, this method is slow and cannot quickly dissipate heat from individual cells.

[0027] Regarding the problems in related technologies, such as Figures 1-3As shown, this utility model provides a battery cell, including a battery cell body 10. A positive electrode post 20 and a negative electrode post 30 are spaced apart on the top cover 11 of the battery cell body 10. Both the positive electrode post 20 and the negative electrode post 30 have an inner cavity 21, and an insulated liquid cooling pipe 70 is provided in the inner cavity 21. The side wall of the inner cavity 21 has a liquid inlet 22 and a liquid outlet 23. An insulated first connecting pipe 71 is provided at the liquid inlet 22, and an insulated second connecting pipe 72 is provided at the liquid outlet 23. The first connecting pipe 71 is connected to the liquid inlet port of the liquid cooling pipe 70, and the second connecting pipe 72 is connected to the liquid outlet port of the liquid cooling pipe 70. The battery cell is the smallest energy storage unit in the battery pack. During use, it undergoes charging and discharging processes, which generate significant heat, especially the positive terminal 20 and negative terminal 30 connected to the external circuit. In this embodiment, by providing an inner cavity 21 within the positive terminal 20 and negative terminal 30 and arranging a liquid cooling pipe 70 within the inner cavity 21, rapid cooling of the upper terminal of the battery cell is achieved, improving the cooling efficiency of the battery cell and effectively cooling the battery cell.

[0028] Specifically, the battery cell body 10 includes a housing and a top cover 11 fixedly connected to the housing. The positive electrode post 20 and the negative electrode post 30 are disposed on the surface of the top cover 11 away from the housing. A first connecting pipe 71 and a second connecting pipe 72 are connected to a liquid cooling circulation system, thereby enabling the liquid cooling circulation system to remove heat from the electrode posts. The liquid cooling pipe 70 is a pipe segment structure with ports at both ends; one port is for coolant input, and the other port is for coolant output.

[0029] 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 pipe 70, 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 post, which in turn carries away the heat of the battery cell, thus achieving effective heat dissipation of the battery cell.

[0030] Furthermore, the liquid cooling pipe 70, the first connecting pipe 71, and the second connecting pipe 72 are all made of insulated pipes. This ensures that all pipes in contact with the electrode are made of insulated materials, preventing electrical leakage. The cooling medium can also be an insulated cooling medium, such as insulating oil, electrolyte coolant, or other insulating liquids. By using an insulated cooling medium, the overall insulation of the liquid cooling system can be further improved.

[0031] Understandably, compared to traditional battery thermal management systems, this embodiment improves the control accuracy of the battery thermal management system by setting liquid cooling pipes 70 on the terminals, thereby achieving effective cooling of individual cells and enabling timely and efficient heat dissipation from the cells.

[0032] In specific configurations, the positive terminal 20 and the negative terminal 30 can be cooled using separate liquid cooling systems, or they can be cooled using the same liquid cooling system. For example, the positive terminal 20 and the negative terminal 30 can be connected in parallel to cool their respective terminals.

[0033] In some specific embodiments, the overall structure of the liquid cooling pipe 70 is not limited; it can be constructed as a tortuous structure or a coiled structure, as long as heat exchange with the inner cavity 21 can be achieved through the liquid cooling pipe 70. Of course, in order to increase the contact area with the internal space of the inner cavity 21, the overall shape of the liquid cooling pipe 70 in this example can be improved to enhance the heat exchange efficiency.

[0034] In some embodiments, the liquid cooling pipes 70 within the positive electrode post 20 and the negative electrode post 30 are connected in series via connecting pipes. In this embodiment, the series connection reduces the complexity of the liquid cooling system piping, improves the efficiency of the liquid cooling system layout, and facilitates large-scale production.

[0035] Specifically, the positive electrode post 20 and the negative electrode post 30 are located on the top cover 11 on the same side, and there is a certain distance between the two posts. In this embodiment, the liquid cooling pipes 70 in the two posts are connected by connecting pipes, which reduces the difficulty of arranging the liquid cooling circulation system and enables the rapid arrangement of the liquid cooling system.

[0036] Understandably, connecting the positive terminal 20 and the negative terminal 30 in series simplifies the overall piping layout, which reduces the difficulty of piping layout in the entire liquid cooling system and improves the equipment assembly efficiency.

[0037] In conjunction with the above embodiments, such as Figure 1 , Figure 3 As shown, the battery cell also includes a liquid cooling box 40, which is located on the top cover 11 between the positive electrode post 20 and the negative electrode post 30. The liquid cooling box 40 has a serpentine flow channel 41 inside. A first connection port 42 and a second connection port 43 are provided on the side wall of the liquid cooling box 40. The first connection port 42 communicates with the liquid cooling pipe 70 inside the positive electrode post 20, and the second connection port 43 communicates with the liquid cooling pipe 70 inside the negative electrode post 30. The positive electrode post 20 and the negative electrode post 30 are connected in series to achieve heat dissipation for their respective posts. Since there is a certain distance between the positive electrode post 20 and the negative electrode post 30, this will affect the heat dissipation of the downstream post. In this embodiment, the liquid cooling box 40 improves the heat dissipation effect and makes the two posts have a relatively balanced heat dissipation effect.

[0038] Specifically, such as Figure 3As shown, the liquid cooling box 40 has an overall box structure. Inside the liquid cooling box 40, there is a serpentine flow channel 41 formed by tortuosity. The serpentine flow channel 41 is used for the flow of cooling medium. This arrangement increases the flow time of the cooling medium in the liquid cooling box 40 and can increase the contact area with the external environment through the liquid cooling box 40, thereby achieving further heat dissipation of the flowing medium.

[0039] The first connection port 42 and the second connection port 43 are used to realize the series connection between the positive electrode 20 and the negative electrode 30. That is, the liquid cooling box 40 is placed on the connecting pipe between the positive electrode 20 and the negative electrode 30. When the cooling medium passes through the liquid cooling box 40, it can exchange heat with the external environment, thereby improving the heat dissipation effect.

[0040] It is understandable that when the liquid cooling pipes 70 in the positive terminal 20 and the negative terminal 30 are connected in series, the heat in the upstream terminal will flow to the downstream terminal with the cooling medium. In this embodiment, by providing a liquid cooling box 40 between the two terminals, the heat in the upstream terminal can be effectively exchanged through the liquid cooling box 40, avoiding a large temperature difference between the upstream and downstream terminals, and making the overall performance of the battery cell more stable.

[0041] In a specific configuration, one side of the positive electrode post 20 is positioned upstream of the liquid cooling system, and the negative electrode post 30 is positioned downstream. The cooling medium flows from the positive electrode post 20 to the negative electrode post 30. A liquid cooling box 40 is installed between the positive and negative electrode posts. The liquid cooling box 40 increases the residence time of the cooling medium and, through a serpentine flow channel 41, achieves a large contact area with the external environment, thereby enabling effective heat exchange and improving heat dissipation capacity. This also improves the heat dissipation effect of the downstream negative electrode post 30, preventing excessive temperature differences between the positive electrode post 20 and the negative electrode post 30. Alternatively, the negative electrode post 30 can be positioned upstream of the liquid cooling circulation system, and the positive electrode post 20 downstream.

[0042] In a specific embodiment, the liquid cooling box 40 has an internal box structure with a accommodating space. Connection ports are provided on two opposite side walls of the liquid cooling box 40. A serpentine pipeline is provided inside the box, forming a flow channel 41 for the cooling medium. The two ends of the serpentine pipeline are connected to the first connection port 42 and the second connection port 43 respectively, thereby realizing the flow of coolant.

[0043] In conjunction with the above embodiments, both the first connection port 42 and the second connection port 43 are equipped with a one-way valve 44. The one-way valve 44 ensures the flow direction of the cooling medium, prevents coolant backflow, and improves heat dissipation.

[0044] Specifically, the first connection port 42 is for coolant inlet, and the second connection port 43 is for coolant outlet. The one-way valves 44 on both ports prevent coolant backflow when pumping stops or when a system malfunction occurs. The one-way flow characteristic of the one-way valves 44 ensures that the coolant flows only in a predetermined direction, preventing backflow into areas where the coolant should not flow, such as the inlet port 22 or outlet port 23, thus ensuring the normal operation of the cooling system.

[0045] In conjunction with the above embodiments, the liquid cooling box 40 is an insulating liquid cooling box 40. Since the liquid cooling box 40 is located between the positive terminal 20 and the negative terminal 30, a short circuit between them would affect the basic function of the entire battery cell. This embodiment limits the liquid cooling box 40 to an insulating material, which can effectively prevent short circuits between the two terminals and improve the stability of the battery cell.

[0046] Specifically, the liquid cooling box 40 is located on the top cover 11 and is made of insulating material, which can effectively prevent short circuits between the two poles. Furthermore, by connecting the protruding liquid cooling box 40 structure in the middle, the overall structural strength of the top cover 11 can be improved, effectively preventing external impacts.

[0047] In some embodiments, the surface of the liquid cooling box 40 on the side away from the housing is at a higher position than the positive electrode post 20 and the negative electrode post 30 on the surface away from the housing. This allows the liquid cooling box 40 to withstand pressure when subjected to external impact, thereby improving the overall stability of the battery cell.

[0048] In conjunction with the above embodiments, a support frame 50 is provided between the positive terminal 20 and the negative terminal 30, and a fan 51 is provided on the support frame 50. The provision of the support frame 50 can improve the overall structural strength and the heat dissipation effect.

[0049] Specifically, the support frame 50 is bolted to the top cover 11 between the positive terminal 20 and the negative terminal 30. The support frame 50 provides an external support structure for the entire battery cell, thereby improving the overall safety performance. Furthermore, the fan 51 accelerates the airflow between the two terminals, thus improving the heat exchange efficiency of the liquid cooling box 40.

[0050] Understandably, the support frame 50 protrudes from the cover plate and the liquid cooling box 40, providing some support when subjected to external impacts. Furthermore, by installing a fan 51 on the support frame 50, it can accelerate airflow in a localized area, thereby improving heat dissipation.

[0051] In the specific setup, bolt holes are provided on the top cover 11, and the support frame 50 is fixed to the top cover 11 by bolts. The bolt connection facilitates the connection of the support frame 50 and the disassembly of the support frame 50, thereby facilitating subsequent maintenance and dust cleaning.

[0052] In the above embodiment, the liquid cooling box 40 is located inside the support frame 50, and the air outlet of the fan 51 is positioned facing the liquid cooling box 40. By directing the air outlet of the fan 51 towards the liquid cooling box 40, the exhaust air can directly face the surface of the liquid cooling box 40, further improving the heat dissipation effect.

[0053] Specifically, the liquid cooling box 40 is located between the two terminals. In this embodiment, the fan 51 faces the liquid cooling box 40, which can directly cool the liquid medium inside the liquid cooling box 40, enhance the overall heat dissipation effect, realize the combination of liquid cooling and air cooling, and effectively reduce the temperature of the downstream terminal, avoiding excessive temperature difference between the upstream and downstream terminals that would affect the performance of the battery cell.

[0054] It is understandable that by setting the fan 51 to face the liquid cooling box 40 directly and fan the liquid cooling box 40, thereby dissipating heat and cooling the coolant inside the liquid cooling box 40. On the one hand, it can prevent the heat brought by the upstream electrode from affecting the downstream electrode, and on the other hand, it can directly cool the coolant, so that liquid cooling and distribution cooling are organically combined to improve the heat dissipation effect.

[0055] In some embodiments, such as Figure 2 The liquid cooling pipe 70 is constructed as a serpentine or U-shaped pipe. By defining the shape of the liquid cooling pipe 70, the contact area between the liquid cooling pipe 70 and the inner cavity 21 is increased, thereby improving the heat exchange efficiency.

[0056] In specific configuration, the battery cell releases a lot of heat during charging and discharging, especially at the positive terminal 20 and negative terminal 30 connected to the external circuit. In this embodiment, liquid cooling pipes 70 are installed in the positive terminal 20 and negative terminal 30 to remove the heat from each terminal, thus achieving effective cooling of the battery cell.

[0057] In some embodiments, insulating gaskets 60 are provided at the locations where the positive terminal 20 and the negative terminal 30 mate with the top cover 11. The use of insulating gaskets 60 improves the safety performance of the battery cell.

[0058] Specifically, the positive terminal 20 and the negative terminal 30 are located at both ends of the cover plate along its length. The insulating pad 60 effectively prevents short circuits between the two terminals, thus improving the safety performance of the battery cell.

[0059] This utility model also provides a battery pack, including a liquid cooling system; and the aforementioned battery cell, wherein the liquid cooling system is connected to a liquid cooling tube 70 on each battery cell.

[0060] Specifically, the liquid cooling circulation system includes necessary components such as circulation pipes for coolant flow, cooling devices, and a drive pump. The circulation pipes are connected to the liquid cooling pipe 70, allowing the drive pump to drive the cooling medium to flow through the circulation pipes, achieving effective heat dissipation of the battery cells. In actual connection, the battery pack contains multiple battery cells, which are connected to the liquid cooling circulation system in parallel, thereby achieving effective heat dissipation for each battery cell.

[0061] The battery pack provided in this embodiment has the battery cells of any of the aforementioned embodiments. Therefore, the battery pack in this embodiment has the characteristic effects of each of the aforementioned battery cells. To avoid redundancy in the effect description, it will not be repeated here.

[0062] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment effectively cools the individual battery cells by providing liquid cooling pipes 70 inside the positive and negative electrode posts. The liquid cooling pipes 70 are used to remove internal heat during the flow of coolant. Furthermore, the combination of liquid cooling and air cooling is achieved through the support frame 50 and the fan 51, which can more effectively reduce the temperature of the battery cells and improve heat dissipation performance. The fan 51 adds an extra heat dissipation method to the entire heat dissipation structure, improving the overall performance of the heat dissipation system.

[0063] 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, characterized in that, include: The battery cell body has a positive terminal and a negative terminal spaced apart on its top cover; both the positive terminal and the negative terminal have an inner cavity, and an insulating liquid cooling pipe is installed inside the inner cavity; The inner cavity has an inlet and an outlet on its side wall. The inlet is provided with an insulated first connecting pipe, and the outlet is provided with an insulated second connecting pipe. The first connecting pipe is connected to the inlet port of the liquid cooling pipe, and the second connecting pipe is connected to the outlet port of the liquid cooling pipe. The liquid cooling pipes in the positive electrode post and the negative electrode post are connected in series through connecting pipes; It also includes a liquid cooling box, which is located on the top cover between the positive electrode post and the negative electrode post, and the liquid cooling box has a serpentine flow channel inside; The liquid cooling box has a first connection port and a second connection port on its side wall. The first connection port is connected to the liquid cooling pipe in the positive electrode post, and the second connection port is connected to the liquid cooling pipe in the negative electrode post.

2. The battery cell according to claim 1, characterized in that, Both the first and second connection ports are equipped with one-way valves.

3. The battery cell according to claim 1, characterized in that, The liquid cooling box is an insulated liquid cooling box.

4. The battery cell according to claim 1, characterized in that, A support frame is provided between the positive and negative terminals, and a fan is provided on the support frame.

5. The battery cell according to claim 4, characterized in that, The liquid cooling box is located inside the support frame, and the air outlet of the fan is oriented towards the liquid cooling box.

6. The battery cell according to claim 1, characterized in that, The liquid cooling pipe is constructed as a serpentine or U-shaped pipe.

7. The battery cell according to claim 1, characterized in that, Insulating gaskets are provided at the locations where the positive and negative terminals mate with the top cover.

8. A battery pack, characterized in that, include: Liquid cooling system; The battery cell according to any one of claims 1-7, wherein the liquid cooling system is connected to the liquid cooling tube on each of the battery cells.

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