A large capacity battery and a battery pack

Abstract

This invention belongs to the field of batteries, specifically a high-capacity battery and battery pack. It overcomes the problems of low energy density, high production cost, low production efficiency, and excessive localized heat at the polarity terminals leading to thermal runaway in existing battery modules. The high-capacity battery includes a casing, n electrode assemblies, and two heat exchangers. The n electrode assemblies are arranged along a first direction inside the casing, with tabs connected to polarity terminals on the top plate of the casing. The heat exchangers are conductive. The two heat exchangers are connected to all positive and negative terminals respectively, realizing the parallel connection of the n electrode assemblies. This invention eliminates the need for a casing in the finished single battery cell, helping to reduce the size and weight of the battery module and increase energy density. Furthermore, this invention fixes the heat exchangers to the polarity terminals, allowing heat generated at the polarity terminals to be conducted to the heat exchangers in close contact and dissipated through heat exchange, achieving efficient heat dissipation.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, specifically a high-capacity battery and battery pack. Background Technology

[0002] Most existing battery modules (also known as battery packs) are formed by connecting multiple individual cells in series, parallel, or series-parallel configurations. Each individual cell includes its own cell, casing, and electrolyte. In this approach, the battery casings of the multiple individual cells in the battery module reduce the overall energy density of the module when assembled, and it also suffers from high production costs and low production efficiency.

[0003] Therefore, how to provide a battery module with high production efficiency, low production cost, and high energy density has become an urgent problem to be solved.

[0004] Furthermore, battery temperature control has always been a hot topic of concern in this field. Most existing batteries use air cooling or liquid cooling to control the overall temperature of the battery. However, since the polar terminals of the battery are the areas where heat is most concentrated, excessive local heat at the polar terminals can easily cause thermal runaway, seriously affecting the safety and performance of the battery and the battery pack it constitutes. Summary of the Invention

[0005] The purpose of this invention is to provide a high-capacity battery and battery pack that overcomes the problems of low energy density, high production cost, low production efficiency, and excessive local heat at polar terminals in existing battery modules, which can lead to thermal runaway.

[0006] The first aspect of this utility model provides a high-capacity battery, including a casing, n electrode assemblies, and two heat exchange components; where n is an integer greater than 1.

[0007] The above n electrode assemblies are arranged in the housing along the first direction. The top plate of the housing is provided with polarity terminals corresponding to the electrode tabs of the electrode assemblies. The tabs of each electrode assembly are connected to the corresponding polarity terminals.

[0008] The heat exchanger includes a heat exchanger body, which is a conductor; at least one cooling channel is formed on the heat exchanger body, which extends along the length of the heat exchanger body and passes through both ends of the heat exchanger body.

[0009] Both heat exchangers extend along the first direction. The body of one heat exchanger is connected to all positive terminals, and the body of the other heat exchanger is connected to all negative terminals, thus realizing the parallel connection of n electrode assemblies.

[0010] This invention places the electrode assembly directly inside the outer casing, using the outer casing as the housing for the electrode assembly. Compared to battery modules that place the finished individual battery cells inside the outer casing, this eliminates the need for the housing of the finished individual battery cells, which helps to reduce the size and weight of the battery module and increase its energy density.

[0011] In addition, this invention fixes a heat exchange component on the polar terminal, so that the heat generated by the polar terminal is conducted to the heat exchange component in close contact with it and dissipated through heat exchange, thereby achieving efficient heat dissipation.

[0012] Meanwhile, the heat exchanger body of this invention is a conductor and is connected to the polarity terminal, enabling parallel connection between individual battery cells. Therefore, in this invention, the heat exchanger not only serves as a heat exchange component but also as a current collector to achieve parallel connection of multiple individual battery cells, offering at least the following advantages:

[0013] Firstly, it eliminates the need for additional dedicated busbars, simplifying the overall structure of large-capacity batteries. Secondly, since the heat exchange components simultaneously perform heat exchange and conductivity functions, it reduces the number of parts in large-capacity batteries, lowering assembly difficulty and cost.

[0014] Furthermore, the inner wall of the aforementioned cooling channel is provided with an insulating layer to form a cooling water flow channel; the aforementioned insulating layer achieves insulation isolation between the cooling water and the heat exchanger body.

[0015] This invention also includes an insulating layer on the inner wall of the cooling channel of the heat exchanger. This insulating layer provides insulation between the heat exchanger body and the cooling water, enabling heat exchange via water cooling. Compared to insulating oil cooling, water cooling better meets the efficient, economical, and environmentally friendly cooling requirements of battery systems.

[0016] Furthermore, the aforementioned insulating layer adopts at least the following two structures:

[0017] The first structure: The insulating layer is a pipe nested within the cooling channel. The corresponding cooling channel can be a through hole opened in the heat exchanger body, or it can be a slotted structure. The slotted cooling channel helps to simplify the internal structure of the heat exchanger and makes the assembly of the heat exchanger body and the pipe more convenient.

[0018] The second structure: the insulating layer is an insulating coating applied to the inner wall of the cooling channel, and the corresponding cooling channel is a through hole opened on the heat exchanger body.

[0019] Furthermore, the aforementioned cooling channels consist of two sections, each with an insulating layer on its inner wall, forming two cooling water channels; one cooling water channel is the inlet channel, and the other is the outlet channel.

[0020] Furthermore, the aforementioned heat exchange component is welded to the polarity terminal. Welding the polarity terminal to the heat exchange component ensures a tight connection between them. Compared to other connection methods, such as simple mechanical fixing, welding eliminates the tiny gaps between the connection points, significantly reducing thermal resistance, improving heat conduction efficiency, and ensuring effective heat transfer. Welding also enhances the stability of the connection, preventing the heat exchange component from separating from the polarity terminal due to vibration or other factors during operation of a large-capacity battery, thus affecting heat dissipation.

[0021] Furthermore, a first through groove extending in a first direction is formed on the aforementioned polarity terminal; the heat exchanger is fitted into the first through groove of each polarity terminal, and the outer wall of the heat exchanger is welded and fixed to the two side walls of the first through groove.

[0022] A first through slot is formed on the polarity terminal extension to hold the heat exchanger in place, ensuring good thermal contact between the heat exchanger and the polarity terminal. When heat is conducted to the polarity terminal, it is further transferred to the heat exchanger. The heat rapidly diffuses within the heat exchanger and is dissipated through the heat transfer medium within the heat exchanger's cavity and through heat exchange with the surrounding environment, thereby achieving heat dissipation for the battery.

[0023] Furthermore, at least one groove is formed on the outer wall of the heat exchanger body, and the groove extends along the length direction of the heat exchanger body.

[0024] The outer wall of the heat exchanger body and the inner wall of the first through groove are coated with thermally conductive adhesive, and at least a portion of the inner cavity of the groove contains thermally conductive adhesive.

[0025] This invention introduces a thermally conductive adhesive, which, compared to traditional solid contact methods, enhances the thermal conductivity and connection strength between the polar terminals and the heat exchanger body. During assembly, even if there are differences in surface shape and roughness between the outer wall of the heat exchanger body and the mounting part, the thermally conductive adhesive can still fill tightly, ensuring uniform heat transfer between the polar terminals and the heat exchanger body.

[0026] Furthermore, the groove on the outer wall of the heat exchanger body in this invention can at least serve as a glue-receiving groove, and has the following functions:

[0027] 1) Anti-overflow adhesive control: During installation, when the heat exchanger is inserted into the first through groove, it can accommodate the excess adhesive squeezed out by the heat exchanger, preventing the adhesive from overflowing and causing pollution.

[0028] 2) Enhanced contact efficiency: The groove structure increases the contact area between the heat exchanger and the colloid, strengthens the heat transfer path, and improves the bonding stability by using a larger bonding surface, preventing loosening and falling off during long-term use.

[0029] Furthermore, the aforementioned housing is further provided with n-1 partitions, dividing the inner cavity of the housing into n electrode assembly receiving cavities; each electrode assembly is disposed in its corresponding electrode assembly receiving cavity, and the electrolytes in the n electrode assembly receiving cavities are interconnected. The partitions not only serve to divide the electrode assembly receiving cavities but also improve the overall structural stability of the housing.

[0030] The second aspect of this utility model provides a battery pack, including multiple high-capacity batteries as described above; the heat exchange components on each high-capacity battery are interconnected to form a battery pack liquid circuit system to realize heat exchange of the battery pack.

[0031] Furthermore, the inlet channels of multiple heat exchangers are connected in series to form a total inlet path; the outlet channels of multiple heat exchangers are connected in series to form a total outlet path; the end of the total inlet path is connected to the beginning of the total outlet path through an external pipe section.

[0032] After the coolant enters the inlet end of the main water inlet path, it flows through the inlet channel of each heat exchanger in sequence, and then through the outer pipe section, it flows through the outlet channel of each heat exchanger in sequence, and flows out from the outlet end of the main water outlet path.

[0033] Within a single heat exchanger, the coolant forms an efficient heat exchange through adjacent inlet and outlet channels, ensuring that each polarity terminal receives a balanced heat dissipation effect. For all heat exchangers, the temperature difference between the inlet and outlet channels remains essentially constant, effectively avoiding localized overheating or undercooling phenomena present in traditional series cooling (traditional series cooling: the coolant gradually heats up as it flows from the main inlet to the main outlet, resulting in a lower battery temperature near the main inlet and a higher battery temperature at the main outlet).

[0034] The beneficial effects of this utility model are:

[0035] This invention places the electrode assembly directly inside the outer casing, using the outer casing as the housing for the electrode assembly. Compared to battery modules that place the finished individual battery cells inside the outer casing, this eliminates the need for the housing of the finished individual battery cells, which helps to reduce the size and weight of the battery module and increase its energy density.

[0036] In addition, this invention fixes a heat exchange component on the polar terminal, so that the heat generated by the polar terminal is conducted to the heat exchange component in close contact with it and dissipated through heat exchange, thereby achieving efficient heat dissipation.

[0037] Meanwhile, the heat exchanger body of this invention is a conductor and is connected to the polarity terminal, enabling parallel connection between individual battery cells. Therefore, in this invention, the heat exchanger not only serves as a heat exchange component but also as a current collector to achieve parallel connection of multiple individual battery cells, offering at least the following advantages:

[0038] Firstly, it eliminates the need for additional dedicated busbars, simplifying the overall structure of large-capacity batteries. Secondly, since the heat exchange components simultaneously perform heat exchange and conductivity functions, it reduces the number of parts in large-capacity batteries, lowering assembly difficulty and cost. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the large-capacity battery in Example 1;

[0040] Figure 2 This is a schematic diagram of the exploded structure of the large-capacity battery in Example 1;

[0041] Figure 3 This is a schematic diagram of the structure of a heat exchanger in Example 1;

[0042] Figure 4 This is a schematic diagram of the exploded structure of a heat exchanger in Example 1;

[0043] Figure 5 This is a cross-sectional view of a heat exchanger in Example 1;

[0044] Figure 6 This is a schematic diagram of another heat exchanger in Example 1;

[0045] Figure 7 This is an exploded structural diagram of another heat exchanger in Example 1;

[0046] Figure 8 This is a partially enlarged structural schematic diagram of a heat exchanger in Example 1;

[0047] Figure 9 This is a schematic diagram of the battery pack structure in Example 1;

[0048] Figure 10 This is a schematic diagram of the heat exchanger structure in Example 2;

[0049] Figure 11 This is a cross-sectional view of the heat exchanger in Example 2;

[0050] Figure 12 This is a schematic diagram of the structure of the first heat exchanger in Example 4;

[0051] Figure 13 This is a cross-sectional view of the first heat exchanger in Example 4;

[0052] Figure 14 This is a schematic diagram of the structure of the second type of heat exchanger in Example 4;

[0053] Figure 15 This is a cross-sectional view of the second type of heat exchanger in Example 4;

[0054] Figure 16This is a schematic diagram of the structure of the third type of heat exchanger in Example 4;

[0055] Figure 17 This is a cross-sectional view of the third type of heat exchanger in Example 4;

[0056] Figure 18 This is a schematic diagram of the battery pack structure in Example 4;

[0057] Figure 19 This is a schematic diagram of a partial explosion structure of the large-capacity battery in Example 5.

[0058] The attached figures are labeled as follows:

[0059] 1. Outer shell; 11. Housing; 12. Top plate of outer shell; 2. Polar terminal; 21. First through slot; 3. Heat exchanger; 31. Heat exchanger body; 32. Cooling channel; 321. Water inlet channel; 322. Water outlet channel; 33. Metal pipe; 34. Insulation layer; 35. Stepped structure; 36. Groove; 37. First heat exchanger; 38. Second heat exchanger; 39. Ceramic pipe; 30. Metal reinforcement layer; 4. Partition plate; 5. Electrode assembly. Detailed Implementation

[0060] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0061] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0062] In the description of this utility model, it should be noted that the terms "top," "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] This utility model of a high-capacity battery includes a casing and n electrode assemblies disposed within the inner cavity of the casing, where n is an integer greater than 1 and can be selected according to actual needs.

[0064] It should be noted that the electrode assembly here refers to a battery cell, a component inside the casing of a single battery cell, and should not be understood as the single battery cell itself. Furthermore, it can be a wound core or a cell manufactured by stacking sheets. Generally, the electrode assembly includes at least a positive electrode, a separator, a negative electrode, and tabs connected to the positive and negative electrode sheets respectively. For ease of description, this invention refers to the tab on the positive electrode sheet as the positive electrode tab and the tab on the negative electrode sheet as the negative electrode tab.

[0065] This utility model has multiple polarity terminals on the top plate of the outer casing. Some of these terminals serve as the positive terminals of a high-capacity battery, while others serve as the negative terminals. n electrode assemblies are arranged inside the casing along a first direction, with the positive and negative tabs of each assembly connected to the corresponding positive and negative terminals on the top plate of the casing. The polarity terminals must be insulated from the top plate, and the way the polarity terminals are mounted on the casing is consistent with the way the upper electrode post and upper cover plate of existing square lithium battery cover assemblies are mounted.

[0066] It should be noted that the number of polarity terminals can be the same as the number of tabs, with each tab connected to a corresponding polarity terminal. Alternatively, the number of polarity terminals can be less than the number of tabs. In this case, multiple electrode assembly tabs can be connected in parallel using a copper busbar, and then the copper busbar can be connected to the corresponding polarity terminals.

[0067] This invention eliminates the need for a single battery casing, placing n electrode components within the same housing. This helps reduce the size and weight of the battery module and increases energy density. Simultaneously, the electrolyte is uniformly distributed throughout the housing, ensuring that all electrode components within the large-capacity battery are in a unified electrolyte environment. Furthermore, all electrode components are also in the same gas environment, improving the performance and charge-discharge cycle life of the large-capacity battery.

[0068] To improve the heat dissipation efficiency of such high-capacity batteries, this invention also connects a heat exchanger to the polar terminals. The heat exchanger conducts the heat from the polar terminals, where the heat is most concentrated on each electrode assembly, to the outside for heat dissipation. This heat dissipation method achieves balanced heat dissipation for each electrode assembly within the high-capacity battery, thereby improving the safety of using the high-capacity battery.

[0069] Furthermore, the heat exchanger of this invention is a conductor, and based on the heat exchanger, heat exchange is performed on a large-capacity battery while simultaneously achieving parallel connection between n electrode components.

[0070] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0071] Example 1

[0072] like Figure 1 As shown, the high-capacity battery in this embodiment includes a casing 1 and 12 electrode assemblies 5 located inside the casing 1 (electrode assembly 5 can be found in...). Figure 19 In other embodiments, the number of electrode assemblies 5 may be adjusted according to actual needs.

[0073] In this embodiment, the outer shell 1 has a rectangular parallelepiped structure. For ease of description, the length direction of the outer shell 1 is defined as the x-direction, the width direction as the y-direction, and the height direction as the z-direction.

[0074] In order to facilitate the placement of the electrode assembly 5 inside the housing 1, the housing 1 is designed as a split structure in this embodiment, specifically including a box 11 with one end open and a top plate 12 for sealing the open end of the box 11. Each electrode assembly 5 can be placed into the box 11 from the open end of the box 11.

[0075] Typically, the casing 11 is made of the same aluminum material as commercially available single-cell battery casings. The casing 11 can be a single piece, formed by casting. Alternatively, it can be a separate piece, formed by aluminum extrusion into a cylindrical body with open ends, and then the base plate is welded to the cylindrical body.

[0076] In this embodiment, the material of the outer shell top plate 12 can also be aluminum-based. Its shape is adapted to the shape of the open end of the box 11, and it is a rectangular plate with an area slightly smaller than that of the open end of the box 11. It is fixed to the open end of the box 11 by embedding welding. Alternatively, a stepped structure can be set around the open end of the box 11, and the outer shell top plate 12 can be fixed by fusion welding or friction welding. The stepped surface of the stepped structure can also be used as a positioning surface. Using this positioning surface, the outer shell top plate 12 can be positioned at the open end of the box 11 first, and then fixed by fusion welding or friction welding.

[0077] Multiple polarity terminals 2 are provided on the top plate 12 of the outer casing. Figure 1 In this design, a total of 24 polarity terminals 2 are provided on the top plate 12 of the outer casing, the same number as the tabs of all electrode assemblies 5. Twelve of these polarity terminals 2 serve as the positive terminals of the high-capacity battery and are evenly arranged along the x-direction on one side of the top plate 12. The other twelve polarity terminals 2 serve as the negative terminals of the high-capacity battery and are evenly arranged along the x-direction on the other side of the top plate 12. For high-capacity batteries assembled on this type of top plate 12, each tab needs to be connected to its corresponding polarity terminal 2 one by one.

[0078] In some other embodiments, a total of 10 polarity terminals 2 can be provided on the top plate 12 of the outer casing. Five polarity terminals 2 are evenly arranged along the x-direction on one side of the top plate 12 as positive terminals of the high-capacity battery, and the other five polarity terminals 2 are evenly arranged along the x-direction on the other side of the top plate 12 as negative terminals of the high-capacity battery. For high-capacity batteries assembled on this type of top plate 12, copper busbars are used to first connect the various electrode components 5 in parallel before connecting the copper busbars to the corresponding polarity terminals 2.

[0079] from Figure 2 As can be seen from the diagram, in this embodiment, a first through groove 21 is formed on each polarity terminal 2 as a mounting structure for the heat exchanger 3. The first through groove 21 extends through the polarity terminal 2 along a first direction, and its inner cavity is used to install the heat exchanger 3.

[0080] The inner cavity shape of the first through slot 21 is adapted to the cross-sectional shape of the heat exchanger 3, ensuring that the heat exchanger 3 is tightly clamped within it. This ensures installation stability while also guaranteeing the heat transfer effect between the heat exchanger 3 and the polar terminal 2. As can be seen from the figure, this embodiment uses a rectangular first through slot 21, and the heat exchanger 3 adapted to it has a rectangular cross-section.

[0081] In some other embodiments, the polarity terminal 2 may not have the first through groove 21, and the heat exchanger 3 can be directly welded to the outer wall of the polarity terminal 2. However, compared to this embodiment, the contact area between the heat exchanger 3 and the polarity terminal 2 is smaller, limiting the heat exchange effect of the heat exchanger 3. In contrast, in this embodiment, the first through groove 21 achieves a large-area surface contact between the heat exchanger 3 and the polarity terminal 2, allowing heat to be quickly and evenly conducted from the polarity terminal 2 to the heat exchanger 3, significantly improving the heat transfer rate and more effectively maintaining the appropriate operating temperature of the battery.

[0082] like Figure 3 , Figure 4 and Figure 5 As shown, the heat exchanger 3 in this embodiment includes a heat exchanger body 31, the overall structure of which can serve as a busbar, connecting to the polarity terminal 2 of the same polarity in the large-capacity battery, thereby realizing the parallel connection between the various electrode components 5 of the large-capacity battery. It can be made of a metal material with good electrical and thermal conductivity, such as silver, copper, or aluminum. However, considering both cost and electrical and thermal conductivity, aluminum is generally chosen as the material for the heat exchanger body 31.

[0083] In this embodiment, a cooling channel 32 extending along its length and penetrating both ends is opened on the heat exchanger body 31 as a flow channel for the liquid cooling medium.

[0084] In the field of battery thermal management, commonly used liquid cooling media include water and insulating oil, which exchange heat through a circulation system. Considering factors such as cooling efficiency, cost, and environmental impact, water cooling has significant advantages over insulating oil cooling.

[0085] In terms of cooling efficiency, water has a specific heat capacity as high as 4.2 × 10⁻⁶. 3 Its thermal conductivity is approximately 0.6 W / (m·K), while the specific heat capacity of insulating oil is only 1.6 × 10⁻⁶ W / (kg·℃). 3 J / (kg·℃)-2.5×10 3 With a thermal conductivity of 0.1-0.15 W / (m·K) and a heat transfer coefficient of J / (kg·℃), water is far more efficient than insulating oil at removing heat from the battery's polarity terminal 2. In terms of cost, water is widely available and inexpensive, while insulating oil is expensive. From an environmental perspective, insulating oil is difficult to degrade once leaked, causing environmental pollution, while water is harmless and produces no waste after leakage. Therefore, water cooling better meets the battery system's needs for efficient, economical, and environmentally friendly cooling.

[0086] Based on the above advantages, water cooling is preferably used in this embodiment.

[0087] It should be noted that since the heat exchanger body 31 is a conductor, if an insulating liquid cooling medium such as insulating oil flows in the cooling channel 32, heat exchange can be directly achieved at the polarity terminal 2; if water is used as the liquid cooling medium, the inner wall of the cooling channel 32 needs to be insulated to ensure the safe operation of the system.

[0088] Specifically, the cooling channel 32 can adopt the following two structures:

[0089] First type of structure: Through hole;

[0090] like Figure 4 and Figure 5 As shown, the cooling channel 32 is a through hole that runs through both ends of the heat exchanger body 31 in the length direction.

[0091] The second structure: the second through slot;

[0092] like Figure 6 and Figure 7 As shown, the cooling channel 32 is a second through groove that runs through both ends of the heat exchanger body 31 in the length direction.

[0093] In this embodiment, a metal pipe 33 is nested inside the cooling channel 32, and an insulation layer 34 is provided on the outer wall of the metal pipe 33. The insulation layer 34 is tightly attached to the inner wall of the cooling channel 32 to achieve insulation isolation between the cooling water and the heat exchanger body 31.

[0094] The insulating layer 34 described above can take at least the following two structures:

[0095] Structure 1: Enamel insulation layer;

[0096] A mature enamel process can be adopted. By controlling the thickness of the enamel insulation layer, excellent insulation performance can be ensured, blocking the current path between the cooling water and the heat exchanger body 31, without significantly affecting the thermal conductivity of the metal pipe 33. This ensures that heat can be quickly and efficiently transferred from the heat exchanger 3 to the metal pipe 33 and the cooling water inside the pipe, achieving a good heat dissipation effect.

[0097] The enamel insulation layer is made of porcelain enamel fired at high temperature. It has extremely high insulation resistance and can effectively block the current path between the cooling water and the heat exchanger body 31, thus avoiding short circuits and safety problems caused by the cooling water being electrified.

[0098] Furthermore, the tight bonding between the enamel insulation layer and the metal pipe 33 does not significantly affect the thermal conductivity. Compared with some organic insulating materials, the enamel insulation layer can maintain stable thermal conductivity even at high temperatures. It will not soften or decompose due to heat, thus ensuring that the heat generated by the battery polarity terminal 2 can be dissipated in time, maintaining the battery at a suitable operating temperature and improving the battery's charging and discharging performance and service life.

[0099] Meanwhile, because the enamel insulation layer has a stable structure and good wear resistance, it will not deform or fall off due to slight external impact or squeezing, thus ensuring structural stability.

[0100] Corresponding to the structure of the insulating layer 34, the cooling channel 32 can be a through hole or a second through groove.

[0101] When the cooling channel 32 is a through hole, the heat exchanger body 31 can be cast to cover the metal pipe 33 with an enamel insulation layer on its outer wall, and the casting temperature is lower than the heat deformation temperature of the metal pipe 33 and the enamel insulation layer. During the casting process, the material of the heat exchanger body 31 fills the mold in a liquid state, tightly wrapping the metal pipe 33 with the enamel insulation layer. After cooling and solidification, a stable integral structure is formed, which greatly reduces the contact thermal resistance between the two.

[0102] When cooling channel 32 is the second through slot, such as Figure 7 As shown, the heat exchanger body 31 can be machined first, and then the metal pipe 33 with an enamel insulation layer on its outer wall can be inserted into the second through groove from the opening end of the second through groove. However, compared with the casting process, the stability between the pipe and the heat exchanger body 31 is lower.

[0103] Structure 2: Insulating and thermally conductive adhesive layer;

[0104] First, the metal pipe 33 can be placed in a predetermined position within the cooling channel 32, ensuring accurate positioning. Then, insulating thermally conductive adhesive is poured between the metal pipe 33 and the cooling channel 32. The cured adhesive layer firmly adheres to the outer wall of the metal pipe 33 and the inner wall of the cooling channel 32, achieving not only insulation between the cooling water and the heat exchanger body 31, but also promoting heat transfer from the heat exchanger 3 to the cooling water due to its excellent thermal conductivity. Simultaneously, the adhesive properties of the insulating thermally conductive adhesive make the connection between the metal pipe 33 and the cooling channel 32 more stable, enhancing the overall stability of the heat exchanger 3 structure.

[0105] Corresponding to the structure of the insulation layer 34, the cooling channel 32 is preferably a second through groove. The open end of the second through groove can serve as a dispensing port. During dispensing, due to the openness of the second through groove, the adhesive can evenly fill the gap between the metal pipe 33 and the inner wall of the cooling channel 32 under the action of gravity and fluidity. When the size of the second through groove is larger than the size of the metal pipe 33 in the z-direction, an insulating and thermally conductive adhesive layer can be wrapped around the entire outer wall of the metal pipe 33. During the dispensing process, the thickness of the insulating and thermally conductive adhesive layer can be ensured to be uniform by controlling parameters such as dispensing speed and pressure, thus avoiding defects such as bubbles and voids.

[0106] The aforementioned insulating and thermally conductive adhesives can be silicone-based, epoxy resin-based, etc. Their thickness typically needs to comprehensively consider insulation, thermal conductivity, and adhesion requirements. Generally, while meeting insulation performance requirements, a thinner adhesive layer helps reduce thermal resistance and improve thermal conductivity, but excessive thinness may affect bond strength and insulation reliability. A thicker adhesive layer, while enhancing adhesion and insulation, increases thermal resistance and affects heat dissipation. In practical applications, the thickness of the insulating and thermally conductive adhesive layer must be controlled within a reasonable range based on the specific operating conditions and performance requirements of large-capacity batteries to achieve a balance among various performance aspects.

[0107] It should be noted that, in the x-direction, the metal pipe 33 with the insulation layer 34 can extend from both ends of the heat exchanger body 31, which further effectively prevents accidental contact and conduction between the end face and inner wall of the metal pipe 33 and the heat exchanger body 31.

[0108] The heat exchanger 3 described above can be installed using the following process:

[0109] One heat exchanger 3 is fixed along the x-direction in the first through groove 21 of each positive polarity terminal 2 on the same side, and the other heat exchanger 3 is fixed along the x-direction in the first through groove 21 of each negative polarity terminal 2 on the same side. The heat exchanger body 31 is welded and fixed to the two side walls of the first through groove 21 on each polarity terminal 2.

[0110] Specifically, there are two feasible welding methods. First, the two large sidewalls of the first through groove 21 can be welded to the heat exchanger body 31 to form a strong connection, effectively enhancing the bonding strength and heat conduction performance of the two. Second, welding can also be performed along the contact area between the end face of the sidewall of the first through groove 21 and the tube wall of the heat exchanger body 31 to ensure that the weld is uniform and continuous, thereby achieving a tight connection between the two.

[0111] By welding, a tight connection can be achieved between the heat exchanger 3 and the polarity terminal 2. Compared to other connection methods, such as simple mechanical fixing, welding eliminates tiny gaps at the connection point, greatly reducing thermal resistance and significantly improving the heat conduction efficiency between the two, ensuring effective heat transfer. Simultaneously, welding enhances the connection stability, preventing the heat exchanger 3 from separating from the polarity terminal 2 due to vibration, impact, or other factors during the operation of a large-capacity battery. This avoids affecting heat dissipation and ensures the continuous and stable operation of the large-capacity battery.

[0112] In this embodiment, a stepped structure 35 can also be provided on the outer wall of the heat exchanger body 31 along its length. The horizontal surface of the stepped structure 35 is flush with the end face of the side wall of the first through groove 21, and a welded connection is made at the joint between the horizontal surface of the stepped structure 35 and the end face of the side wall of the first through groove 21 (e.g., Figure 1 (Region a is shown in the middle).

[0113] It should be noted that the horizontal plane of the aforementioned stepped structure 35 refers to the connection surface between the large-diameter section and the small-diameter section of the heat exchanger 3 in the z-direction.

[0114] A stepped structure 35 is provided on the outer wall of the heat exchanger body 31, and the horizontal plane of the stepped structure 35 is flush with the end face of the side wall of the first through groove 21. At the same time, the joint is welded together, which has at least the following advantages:

[0115] Improved stability: The stepped structure 35 provides a larger welding contact area, making the welded connection more robust, reducing the risk of connection loosening due to vibration, and improving the overall stability of large-capacity batteries.

[0116] Optimize thermal conductivity and electrical conductivity: The horizontal plane of the stepped structure 35 is flush with the side wall end face of the first through groove 21, ensuring a tighter contact between the heat exchanger 3 and the polar terminal 2, reducing the tiny gaps between the contact interfaces, significantly reducing thermal resistance, and improving thermal conductivity. At the same time, the tight contact between the two significantly reduces the contact resistance, allowing the current to be evenly distributed between the heat exchanger 3 and the polar terminal 2, avoiding local current concentration or hot spots caused by poor contact.

[0117] Furthermore, during the welding process, conventional welding operations may damage the structure of the heat exchanger 3 due to factors such as high temperature and stress concentration, thus leading to potential leakage hazards. The stepped structure 35, however, has a horizontal plane flush with the sidewall end face of the first through groove 21, providing an ideal operating plane for laser welding along the z-direction. This effectively avoids leakage problems caused by damage to the heat exchanger 3 structure during the welding process. When cooling water flows within the heat exchanger 3, this design effectively prevents cooling water leakage from the joints.

[0118] In this embodiment, the inner cavity of the metal pipe 33 is used as a cooling water channel. When the heat from the polar terminal 2 is conducted to the polar terminal 2, it will be further transferred to the cooling water in the cooling water channel of the heat exchanger 3, thereby achieving heat dissipation for the large-capacity battery.

[0119] Meanwhile, in this embodiment, the heat exchanger 3 is entirely conductive. The polar terminals 2 on the same side of the large-capacity battery have the same polarity, while the polar terminals 2 on different sides have opposite polarities. The two heat exchangers 3 are respectively fixed on the polar terminals 2 on both sides to realize the parallel connection of multiple electrode assemblies 5.

[0120] Therefore, in this embodiment, the heat exchanger 3 not only serves as a heat exchange component but also as a conductor to realize the parallel connection of multiple electrode assemblies 5, which has at least the following advantages:

[0121] Firstly, the elimination of the need for a dedicated busbar simplifies the overall structure of the large-capacity battery. In traditional large-capacity batteries, heat exchange and conductivity are often handled by different components, requiring complex structural layouts and connection designs. In this embodiment, however, the heat exchanger 3 integrates both heat exchange and conductivity functions, reducing the need for a dedicated busbar design. This results in a simpler and more compact overall structure for the large-capacity battery, reducing design complexity and the probability of errors.

[0122] Secondly, since heat exchanger 3 performs both heat exchange and electrical conduction functions, it reduces the number of components in a large-capacity battery, thereby lowering assembly difficulty and cost. Previously, separate heat exchange tubes and manifolds were used, resulting in a large number of components, increased procurement costs, and requiring precise installation of each part during assembly, demanding high skill levels from assembly workers and leading to long assembly times.

[0123] Thirdly, the heat exchanger 3, as a parallel connector, is directly embedded in the first through slot 21 of the polarity terminal 2, making full use of the space of the polarity terminal 2 and avoiding the problem of additional busbars occupying space, which is conducive to improving the integration of large-capacity batteries.

[0124] Fourthly, the heat exchanger 3, acting as a parallel connector, ensures a more uniform current distribution among multiple electrode assemblies 5, preventing individual batteries from overheating and being damaged due to excessive current. The heat exchanger 3 is made of a uniform material with good conductivity, and its resistance characteristics are consistent when used as a parallel connector. According to electrical principles, current will be evenly distributed along paths with the same resistance. Therefore, after multiple electrode assemblies 5 are connected in parallel through the heat exchanger 3, the current can flow evenly to each electrode assembly 5, preventing individual batteries from overheating and being damaged due to uneven current distribution. This effectively improves the overall performance and stability of the large-capacity battery.

[0125] To further improve the connection strength between the heat exchanger 3 and the polar terminal 2 and optimize their thermal conductivity, this invention incorporates a thermally conductive adhesive layer between the heat exchanger 3 and the first through-slot 21 of the polar terminal 2. This adhesive layer tightly adheres to both the heat exchanger 3 and the polar terminal 2, effectively fixing the heat exchanger 3 and significantly improving the stability of its installation. Simultaneously, the adhesive layer significantly optimizes thermal conductivity. Unlike traditional direct solid-to-solid contact methods, the adhesive layer better adapts to different surface shapes and roughnesses. At the microscopic scale, even with minor unevenness on both the heat exchanger 3 and the through-slot of the polar terminal 2, the adhesive layer can fill these gaps through its fluidity, forming an efficient thermal conduction path. This effectively avoids hotspots caused by localized thermal resistance differences, further enhancing the heat dissipation efficiency of the heat exchanger 3.

[0126] During installation, thermally conductive adhesive is typically applied evenly to the inner wall of the first through groove 21 of the polarity terminal 2 of the electrode assembly 5, and then the heat exchanger 3 is inserted into it. However, when the heat exchanger 3 is inserted into the first through groove 21, the thermally conductive adhesive flows under pressure, and a large amount of adhesive overflows from the groove opening. This overflowing adhesive not only easily contaminates the battery body and surrounding components, but also, if the adhesive flows and spreads to the welding area during subsequent welding of the polarity terminal 2 and the heat exchanger 3, it can cause impurities at the welding interface, leading to problems such as incomplete welding and desoldering, seriously affecting the welding quality and connection stability.

[0127] To overcome the above problems, this embodiment can create a groove 36 on the outer wall of the heat exchanger body 31, which serves as a glue-receiving groove. When the heat exchanger 3 is inserted into the through slot of the polarity terminal 2, the squeezed glue is guided into the groove 36 for storage, preventing glue overflow. Furthermore, the groove 36 structure can increase the contact area between the heat exchanger 3 and the glue, strengthening the heat transfer path, while also improving bonding stability with a larger bonding surface, preventing loosening and detachment during long-term use.

[0128] Specifically, such as Figure 8As shown, in this embodiment, a rectangular groove 36 is formed on the opposite sidewalls of the heat exchanger body 31, and the groove 36 extends along the length of the heat exchanger body 31; the groove 36 serves as a glue container to hold the excess glue that is squeezed out.

[0129] In other embodiments, the number, position and cross-sectional shape of the grooves 36 can be adjusted according to actual needs. For example, two grooves 36 with trapezoidal cross-sections can be opened on opposite sidewalls of the heat exchanger body 31.

[0130] By designing the dimensions of the groove 36, it is possible to simultaneously meet the requirements of "ensuring that the extruded thermally conductive adhesive can be contained" and "not affecting the structural strength of the heat exchanger body 31".

[0131] If the groove 36 is too narrow or too shallow, it will not be able to fully accommodate the excess adhesive that is extruded, and the problem of adhesive overflow will still occur. If the groove 36 is too wide or too deep, it will significantly reduce the effective load-bearing cross-sectional area of ​​the heat exchanger body 31, which will significantly weaken its mechanical properties and make it prone to deformation or even breakage when subjected to external mechanical or thermal stress.

[0132] The thermally conductive adhesive layer can be made of silicone thermally conductive adhesive, which is based on silicone polymer and combined with high thermal conductivity filler material; or it can be made of acrylic thermally conductive adhesive, which can form a stable thermally conductive adhesive layer in a short time.

[0133] like Figure 9 The diagram shown is a schematic of the battery pack structure in this embodiment, which includes four high-capacity batteries arranged along the y-direction. In other embodiments, the number of high-capacity batteries can be adjusted according to actual needs.

[0134] For ease of description, the two heat exchangers 3 on each high-capacity battery are defined as the first heat exchanger 37 and the second heat exchanger 38, respectively.

[0135] In the entire battery pack, multiple first heat exchangers 37 are connected in series to form a total liquid inlet path; multiple second heat exchangers 38 are connected in series to form a total liquid outlet path; the end of the total liquid inlet path is connected to the beginning of the total liquid outlet path through an external pipe section.

[0136] After entering the main inlet, the cooling water flows through the first heat exchanger 37 of each large-capacity battery in sequence, and then through the external pipe section, it flows through the second heat exchanger 38 of each large-capacity battery in sequence, and flows out from the main outlet.

[0137] This series-connected fluid flow design allows cooling water to flow sequentially through each large-capacity battery, carrying away the heat generated by each battery. During the cooling water flow, each large-capacity battery receives relatively even cooling, avoiding temperature differences caused by insufficient or excessive cooling of some large-capacity batteries, and achieving uniform temperature distribution across the entire battery pack.

[0138] In some other embodiments, the heat exchangers 3 may be connected in parallel.

[0139] Example 2

[0140] The large-capacity battery in this embodiment differs from the large-capacity battery in Embodiment 1 only in that it uses a heat exchanger 3 with a different structure.

[0141] like Figure 10 and Figure 11 As shown, the structure of the heat exchanger body 31 in this embodiment is the same as that in embodiment 1. The difference is that in this embodiment, a ceramic pipe 39 is nested inside the cooling channel 32 of the heat exchanger body 31. The inner cavity of the ceramic pipe 39 serves as a cooling water flow channel, and insulation isolation between the cooling water and the heat exchanger body 31 can be achieved based on the ceramic pipe 39.

[0142] Ceramic itself is an excellent insulating material, which ensures the insulation between the cooling water and the heat exchanger body 31 by its material nature. Without the need for additional complicated insulation treatment processes, it can provide reliable electrical insulation protection for large-capacity batteries and improve the safety of large-capacity batteries.

[0143] Furthermore, the ceramic pipe 39 has a low coefficient of thermal expansion, which allows it to maintain dimensional stability during the operation of large-capacity batteries, even under frequent temperature changes. It is less prone to deformation due to thermal expansion and contraction, ensuring the structural integrity and flow stability of the cooling water channel. Simultaneously, the ceramic material possesses excellent thermal conductivity, enabling it to quickly transfer heat from the heat exchanger 3 to the cooling water inside the pipe, thus improving overall heat dissipation efficiency and maintaining the battery's optimal operating temperature.

[0144] Although ceramic materials have high hardness, they are relatively brittle and prone to cracking when subjected to external impact or vibration. To overcome this problem, this embodiment provides a metal reinforcing layer 30 on the inner wall of the ceramic pipe 39 to enhance its mechanical strength. The metal reinforcing layer 30 can be made of a material with good toughness and ductility, effectively absorbing and dispersing external forces, buffering external impacts, preventing the ceramic pipe 39 from cracking, and extending its service life.

[0145] Specifically, in this embodiment, an aluminum layer is selected as the metal reinforcement layer 30. Aluminum not only has excellent thermal conductivity but also good plasticity, making it easy to process and shape.

[0146] In some other embodiments, other metal-formed metal reinforcement layers 30 may also be selected, such as titanium alloys, nickel-based alloys, etc., to improve the mechanical strength of ceramic pipes 39.

[0147] In this embodiment, the aluminum layer and the heat exchanger body 31 can both be cast onto the inner and outer walls of the ceramic pipe 39, respectively, with the casting temperature strictly controlled below the heat deformation temperature of the ceramic pipe 39. This casting method allows the aluminum layer and the heat exchanger body 31 to fit tightly against the inner and outer walls of the ceramic pipe 39, forming a stable composite structure. Furthermore, the mature and easy-to-operate casting process allows for the integration of all three components in a single molding process, effectively reducing assembly steps and significantly improving production efficiency.

[0148] In some other embodiments, thermal spraying technology can also be used to form a metallic aluminum layer on the inner wall of the ceramic pipe 39.

[0149] In this embodiment, the battery pack is identical to that in embodiment 1, except that the structure of the heat exchanger 3 is different from that in embodiment 1. It will not be described again here.

[0150] Example 3

[0151] The large-capacity battery in this embodiment differs from the large-capacity battery in Embodiment 1 only in that it uses a heat exchanger 3 with a different structure.

[0152] The structure of the heat exchanger body 31 in this embodiment is the same as that in embodiment 1. The difference is that in this embodiment, an insulating coating is applied to the inner wall of the cooling channel 32 with the through hole structure to achieve insulation isolation between the cooling water and the heat exchanger body 31.

[0153] Insulating coatings can be epoxy resin coatings, polytetrafluoroethylene coatings, silicone rubber coatings, etc.

[0154] Compared to the embedded pipes used as insulating layers in Examples 1 and 2, coating the inner wall of the cooling channel 32 with an insulating coating results in a simpler structure. However, the bonding strength between the insulating coating and the inner wall of the cooling channel 32 is relatively weak. During long-term use, factors such as the scouring of cooling water, thermal expansion and contraction caused by temperature changes, and mechanical vibration can all lead to problems such as peeling and cracking of the coating. Once the coating is damaged, the insulation performance will drop significantly, or even lose its insulating effect, causing safety hazards. In contrast, the embedded pipes are physically nested or fixedly connected to the cooling channel 32, resulting in stronger structural stability and better resistance to the effects of harsh working conditions.

[0155] In practical applications, improvements can be made to the coating materials, surface treatment, and coating process to effectively optimize the adhesion between the insulating coating and the inner wall of the cooling channel 32. For example, a high-performance composite coating can be selected, or a tackifier can be added to strengthen the bond with the inner wall. The inner wall of the cooling channel 32 can also be treated to improve surface activity and contact area.

[0156] In this embodiment, the battery pack is identical to that in embodiment 1, except that the structure of the heat exchanger 3 is different from that in embodiment 1. It will not be described again here.

[0157] Example 4

[0158] The large-capacity battery in this embodiment differs from the large-capacity battery in the above embodiment only in that it uses a heat exchanger 3 with a different structure.

[0159] like Figures 12 to 17 As shown, in this embodiment, two cooling channels 32 are provided on the heat exchanger body 31. The two cooling channels 32 are isolated from each other. The rest of the structure of the heat exchanger body 31, the structure of each cooling channel 32, and the insulating isolation layer therein are the same as in the above embodiment.

[0160] Figure 12 and Figure 13 In the middle, both cooling channels 32 adopt a through-hole structure. Figure 14 and Figure 15 In this embodiment, both cooling channels 32 adopt a second through-slot structure; a metal pipe 33 is nested inside each cooling channel 32, and an insulating layer 34 is provided on the outer wall of the metal pipe 33. The insulating layer 34 is tightly attached to the inner wall of the cooling channel 32 to achieve insulation isolation between the cooling water and the heat exchanger body 31. The detailed structure of the insulating layer 34 has been described in Embodiment 1 and will not be repeated here.

[0161] like Figures 16 to 17 As shown, the structure of each cooling channel 32 and its internal insulation layer are the same as in Embodiment 2 above; a ceramic pipe 39 is nested inside the cooling channel 32 to achieve insulation isolation between the cooling water and the heat exchanger body 31. Specific structural details have been described in Embodiment 2 and will not be repeated here.

[0162] like Figure 18 The diagram shown is a structural schematic of the battery pack in this embodiment. The battery pack contains three high-capacity batteries arranged along the y-direction. In practical applications, the number of high-capacity batteries can be flexibly adjusted according to specific needs.

[0163] In this embodiment, for ease of description, the two cooling water channels on each heat exchanger 3 are defined as an inlet channel 321 and an outlet channel 322, respectively. The inlet channels 321 of the three large-capacity batteries are connected end to end in sequence to form a total inlet path; the outlet channels 322 of the three large-capacity batteries are connected end to end in sequence to form a total outlet path. The end of the total inlet path is connected to the beginning of the total outlet path through an external pipe section, thus constructing a complete cooling circulation loop.

[0164] The specific cooling process is as follows: Cooling water enters from the main inlet (the inlet end of the main water inlet path), flows sequentially through the inlet channel 321 of each heat exchanger 3, then changes direction at the outer pipe section, and then flows sequentially through the outlet channel 322 of each heat exchanger 3, finally flowing out from the main outlet (the outlet end of the main water outlet path). Inside a single heat exchanger 3, the coolant achieves efficient heat exchange through adjacent inlet channels 321 and outlet channels 322, ensuring that each polarity terminal 2 receives uniform heat dissipation. For all heat exchangers 3 in the entire battery pack, the temperature difference between the inlet channel 321 and the outlet channel 322 remains stable, effectively overcoming the problem of localized overheating or overcooling at both ends of the battery pack caused by the gradual temperature rise of the coolant during flow in traditional series cooling methods.

[0165] Example 5

[0166] Unlike the above embodiments, as Figure 19 As shown, in this embodiment, multiple partitions 4 are provided inside the housing 11. The multiple partitions 4 are evenly arranged in the x-direction inside the housing 11, dividing the inner cavity of the housing 11 into multiple electrode assembly 5 receiving cavities; each electrode assembly 5 is located in the corresponding electrode assembly 5 receiving cavity.

[0167] In order to achieve communication between the electrolyte in the cavities of each electrode assembly 5, this embodiment provides an electrolyte channel on the bottom plate of the outer shell 1, which is connected to the cavities of each electrode assembly 5.

[0168] To further improve the uniformity of the electrolyte within the cavities of each electrode assembly 5, through holes can be formed in the partition 4 to connect adjacent electrode assembly 5 cavities. These through holes also allow for communication of the electrolyte within the cavities of each electrode assembly 5. This invention does not limit the position or shape of the through holes; for example, ... Figure 19 As shown, multiple elongated through holes can be opened on the partition 4, each elongated through hole extending along the z direction and the multiple elongated through holes arranged along the y direction.

[0169] The separator 4 and the housing 11 can be integrally formed. Compared with separate parts, integral forming can have higher strength and can effectively suppress the expansion of the battery module during use. The overall stability of the housing 1 is better. The separator 4 not only serves to separate the cavity of the electrode assembly 5, but also acts as a reinforcing rib, increasing the overall strength of the housing 1 and effectively suppressing the bulging and deformation of the housing 1.

Claims

1. A high-capacity battery, characterized in that: It includes an outer shell, n electrode assemblies, and two heat exchangers; where n is an integer greater than 1. The n electrode assemblies are arranged in the housing along the first direction. The top plate of the housing is provided with polarity terminals corresponding to the electrode tabs of the electrode assemblies. The tabs of each electrode assembly are connected to the corresponding polarity terminals. The heat exchanger includes a heat exchanger body, which is a conductor; at least one cooling channel is formed on the heat exchanger body, which extends along the length of the heat exchanger body and passes through both ends of the heat exchanger body. Both heat exchangers extend along the first direction. The body of one heat exchanger is connected to all positive terminals, and the body of the other heat exchanger is connected to all negative terminals, thus realizing the parallel connection of n electrode assemblies.

2. The high-capacity battery according to claim 1, characterized in that: The inner wall of the cooling channel is provided with an insulating layer to form a cooling water flow channel; the insulating layer achieves insulation isolation between the cooling water and the heat exchanger body.

3. The high-capacity battery according to claim 2, characterized in that: The insulating layer is a pipe nested within the cooling channel or an insulating coating applied to the inner wall of the cooling channel.

4. The high-capacity battery according to claim 2, characterized in that: The cooling channel consists of two channels, each with an insulating layer on its inner wall, forming two cooling water channels; one cooling water channel is the inlet channel, and the other is the outlet channel.

5. The high-capacity battery according to any one of claims 1 to 4, characterized in that: The heat exchanger is welded to the polarity terminal.

6. The high-capacity battery according to claim 5, characterized in that: A first through slot extending in a first direction is formed on the polar terminal; The heat exchanger is installed in the first through slot of each polarity terminal, and the outer wall of the heat exchanger is welded and fixed to the two side walls of the first through slot.

7. The high-capacity battery according to claim 6, characterized in that: At least one groove is formed on the outer wall of the heat exchanger body, and the groove extends along the length direction of the heat exchanger body. A thermally conductive adhesive is applied between the outer wall of the heat exchanger body and the inner wall of the first through groove, and at least a portion of the inner cavity of the groove contains the thermally conductive adhesive.

8. The high-capacity battery according to claim 1, characterized in that: The outer shell is further provided with n-1 partitions, which divide the inner cavity of the outer shell into n electrode assembly receiving cavities; each electrode assembly is set in its corresponding electrode assembly receiving cavity, and the electrolyte in the n electrode assembly receiving cavities is interconnected.

9. A battery pack, characterized in that: It includes multiple high-capacity batteries as described in any one of claims 1 to 8; the heat exchange components on each high-capacity battery are interconnected to form a battery pack liquid circuit system to realize battery pack heat exchange.

10. The battery pack according to claim 9, characterized in that: The inlet channels of multiple heat exchangers are connected in series to form the total inlet path; the outlet channels of multiple heat exchangers are connected in series to form the total outlet path; the end of the total inlet path is connected to the beginning of the total outlet path through an external pipe section. After the coolant enters the inlet end of the main water inlet path, it flows through the inlet channel of each heat exchanger in sequence, and then through the outer pipe section, it flows through the outlet channel of each heat exchanger in sequence, and flows out from the outlet end of the main water outlet path.

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