Battery module and battery box

Abstract

The application discloses a battery module and a battery box. The battery module comprises a liquid cooling plate, a plurality of box plates connected with the liquid cooling plate, and a core stack arranged in a containing space formed by the liquid cooling plate and the plurality of box plates. The battery module can adjust the number of stacked layers as required, flexibly adapt to different assembly space sizes and change the upper limit of energy storage while ensuring the cooling effect.

Description

Technical Field

[0001] This application relates to the field of energy storage equipment technology, and in particular to a battery module and battery box. Background Technology

[0002] Currently, battery boxes are widely used as energy storage devices in electric vehicles, energy storage equipment, and other fields. Existing battery boxes typically include battery modules, which in turn include multiple battery cells. The battery cells and battery modules are connected in series and parallel for input and output through conductive connection components. During the operation of the battery box, the battery cells inevitably generate heat. The heat dissipation efficiency and thermal management capability of the battery box directly affect its operational stability.

[0003] To improve the load capacity per unit volume of the battery box and the consistency of temperature control during operation, existing technologies have proposed various improvements to enhance thermal management and structural integration. For example, liquid cooling plates are used as the battery box panels, and thermally conductive interface materials are set between the battery cells. By reusing structural and cooling components in the vertical direction, a wider heat dissipation path and a more compact module structure are achieved, thereby balancing volumetric energy density and heat dissipation efficiency to a certain extent.

[0004] However, the aforementioned improvements are difficult to address the diverse needs of energy storage devices in different scenarios during practical applications. Different power batteries or energy storage devices vary significantly in rated capacity and dimensions, often requiring customized design and matching of the enclosure, liquid cooling plate, side panel limiting structure, connecting strips, and shell dimensions. Existing liquid-cooled battery boxes require new molds or significant modifications to adapt to each application, resulting in high mold costs, long lead times, and numerous versions that increase the complexity of subsequent maintenance and upgrades. Therefore, achieving structural universality and dimensional adjustability while ensuring thermal management performance and assembly reliability has become a pressing technical problem to be solved in this field. Utility Model Content

[0005] One objective of this application is to provide a battery module and battery box that addresses the technical problems of rigid liquid-cooled battery box structures and high adjustment costs in the prior art.

[0006] To achieve the above objectives, in a first aspect, this application provides a battery module, which includes: a liquid cooling plate; multiple boxes respectively connected to the liquid cooling plate, wherein the liquid cooling plate and the multiple boxes together form an accommodating space; and a core stack disposed within the accommodating space and in contact with the liquid cooling plate.

[0007] The battery module of this application includes a liquid cooling plate, multiple boxes respectively connected to the liquid cooling plate, and a core stack located within the accommodating space formed by the liquid cooling plate and the core stack. The core stack serves as the energy storage element of the battery module; the liquid cooling plate is attached to the core stack to dissipate heat from the core stack and maintain the battery module at a stable normal operating temperature; the boxes surround the core stack and are fixedly connected to the liquid cooling plate, serving both to limit and constrain the core stack and to connect and support multiple battery modules when stacked.

[0008] Liquid-cooled battery boxes in related technologies typically have a fixed box structure. To achieve a predetermined heat dissipation path and meet cooling requirements, the placement of the battery cells relative to the liquid cooling plate and pipes is also fixed. In other words, the external dimensions of the battery box and the volume of the battery cells are fixed. Therefore, when it is necessary to adjust the size of the battery box or change its energy storage capacity, it is often necessary to redesign and manufacture new molds. This significantly increases the adaptation cost of the battery box in practical applications and hinders its application in different scenarios.

[0009] Compared to existing technologies, in this application, the end of the accommodating space furthest from the liquid cooling plate is open. When multiple battery modules are stacked, one end of the core stack is in contact with the liquid cooling plate of the battery module it belongs to, and the other end is in contact with the liquid cooling plate of the adjacent battery module, achieving double-sided liquid cooling of the core stack. Furthermore, this double-sided liquid cooling has no stacking limit; as the number of stacked layers increases, the core stack of newly added battery modules can maintain the effect of double-sided liquid cooling. In other words, the battery module of this application can adjust the number of stacked layers as needed, flexibly adapting to different assembly space dimensions and changing the energy storage limit while ensuring cooling performance.

[0010] In conjunction with the first aspect, according to one embodiment of this application, the battery module further includes thermally conductive adhesive sandwiched between the liquid cooling plate and the core stack.

[0011] In conjunction with the first aspect, according to one embodiment of this application, the core stack includes an elastic sheet and a battery cell, a plurality of battery cells are stacked in a first direction, the elastic sheet is sandwiched between adjacent battery cells, the natural length of the core stack in the first direction is L1, the length of the accommodating space in the first direction is L2, and L1 > L2.

[0012] In this embodiment, the core stack includes battery cells and elastic sheets stacked in a first direction. Since the natural length of the core stack in the first direction is greater than the length of the accommodating space in the first direction, when the core stack is placed in the accommodating space, the actual length of the core stack in the first direction is less than its natural length. At least the elastic sheet is compressed. Therefore, under the action of elasticity, the battery cell is subjected to pressure from the elastic sheet. That is, the compression effect of the battery cell is achieved through the internal force of the core stack.

[0013] In conjunction with the first aspect, according to one embodiment of this application, the core stack further includes a connecting bar, which is welded to the battery cell, and the battery cells are connected in series and parallel through the connecting bar.

[0014] In conjunction with the first aspect, according to one embodiment of this application, the box panel includes two first plates and two second plates arranged opposite to each other. The first plates are fixedly connected to the liquid cooling plate, and each of the two second plates is connected to the two first plates respectively. At least one second plate is slidably clamped between the two first plates to adjust the effective size of the accommodating space. The sliding direction of the second plate is parallel to the extending direction of the first plate.

[0015] Inside a single battery module, a second plate is slidably sandwiched between two first plates, allowing the effective size of the accommodating space to be adjusted as needed. In other words, the size of the stack and the upper limit of energy of a single battery module can also be adjusted as needed. Without changing the size and number of the components that make up the battery module, size adjustment and upper limit of energy adjustment at the battery module level are achieved.

[0016] In conjunction with the first aspect, according to one embodiment of this application, the extension direction of the first plate is a first direction, and the core stack includes a plurality of cells stacked in the first direction.

[0017] The first plate extends in the first direction, and the core stack includes multiple cells stacked in the first direction. The sliding direction of the second plate is parallel to the extension direction of the first plate, that is, the sliding direction of the second plate is consistent with the stacking direction of the cells. Therefore, when the number of cells needs to be adjusted, sliding the second plate can make way for newly added cells, or compress the core stack to compensate for the size loss caused by removing cells. In other words, the capacity of the core stack can be adjusted simply by removing the cell closest to the second plate or inserting a cell near the second plate. The adjustment of the core stack capacity does not involve rearranging the remaining cells, and the adjustment process is convenient and easy to operate.

[0018] In conjunction with the first aspect, according to one embodiment of this application, the connection method between the liquid cooling plate and the box plate is one or more of welding, insertion, bonding and riveting.

[0019] Secondly, this application also provides a battery box, including multiple battery modules according to the above embodiments, wherein the multiple battery modules are stacked such that the core stack and the liquid cooling plate are stacked alternately.

[0020] In conjunction with the second aspect, according to one embodiment of this application, it further includes a thermally conductive adhesive sandwiched between adjacent battery modules.

[0021] In conjunction with the second aspect, according to one embodiment of this application, it also includes an electrical module, through which each battery module is electrically connected.

[0022] The beneficial effects of the second aspect can be referred to in the first aspect or any possible implementation of the first aspect, and will not be elaborated here. Based on the implementations provided in the above aspects, this application can also be further combined to provide more implementations.

[0023] Other advantages, objectives and features of this application will be apparent in part from the description which follows, and in part from what those skilled in the art will understand through study and practice of this application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of the battery module provided in the embodiments of this application; Figure 2 It is along Figure 1 Schematic diagram of the cross section of line AA in the middle; Figure 3 It is along Figure 1 Schematic diagram of the cross section of the middle BB line; Figure 4 yes Figure 3 A magnified view of a portion of region C.

[0026] Explanation of icon numbers: 10. Liquid cooling plate; 20. Box plate; 21. First plate; 22. Second plate; 30. Core stack; 31. Elastic sheet; 32. Battery cell. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] In existing technologies, battery boxes are generally composed of several battery modules, each containing multiple battery cells. The cells and modules are connected in series and parallel via conductive connecting elements to complete power input and output. During battery box operation, the battery cells inevitably generate heat. To avoid accidents caused by heat accumulation, battery boxes are typically equipped with heat dissipation and thermal management structures to maintain operational stability. To improve the loading capacity per unit volume and enhance temperature consistency during operation, one related technology improvement involves using a liquid-cooled plate as the box panel, arranging thermally conductive interface materials between the battery cells, and reusing structural and cooling components to expand the heat dissipation path and reduce the module stacking spacing, forming a relatively compact module and box assembly structure.

[0029] However, with the diversification of application scenarios and product specifications, the existing fixed enclosure and predetermined heat dissipation path designs often require specialized development of enclosure panels, liquid cooling plates, limiting side plates, connecting strips, and shells to adapt to different capacity, shape, and interface requirements. This leads to frequent mold opening or significant mold modifications, resulting in heavy cycle and cost burdens. Furthermore, the complexity of versions also increases the complexity of subsequent maintenance and upgrades. How to achieve structural universality and flexible size adjustment while ensuring thermal management performance and assembly reliability, and facilitate the orderly stacking and rapid integration of modules, has become a pressing technical problem to be solved in this field.

[0030] Please refer to Figure 1 and Figure 2 To solve the above-mentioned technical problems, in a first aspect, this application provides a battery module, which includes a liquid cooling plate 10, a plurality of boxes 20 and a core stack 30: each box 20 is connected to the liquid cooling plate 10, and the liquid cooling plate 10 and the plurality of boxes 20 enclose a receiving space; the core stack 30 is disposed in the receiving space and is in contact with the liquid cooling plate 10.

[0031] The battery module of this application includes a liquid cooling plate 10, multiple boxes 20 respectively connected to the liquid cooling plate 10, and a core stack 30 located in the accommodating space formed by the former two. The core stack 30 serves as the energy storage element of the battery module; the liquid cooling plate 10 is attached to the core stack 30 to conduct heat away from the core stack 30 and maintain the battery module at a stable normal operating temperature; the boxes 20 surround the core stack 30 and are fixedly connected to the liquid cooling plate 10, which serves to limit and constrain the core stack 30, and also to connect and support multiple battery modules when stacked.

[0032] Liquid-cooled battery boxes in related technologies typically have a fixed box structure. To achieve a preset heat dissipation path and meet heat dissipation requirements, the placement of the battery cell 32 relative to the liquid cooling plate 10 and liquid cooling pipes is also fixed. That is, the external dimensions of the battery box and the volume of the battery cell 32 are fixed. Therefore, when it is necessary to adjust the size of the battery box or change its energy storage capacity, it is often necessary to redesign and manufacture new molds. This greatly increases the adaptation cost of the battery box in practical applications and hinders its application in different scenarios.

[0033] Compared with the prior art, in this application, the end of the accommodating space away from the liquid cooling plate 10 is open. When multiple battery modules are stacked, one end of the core stack 30 is in contact with the liquid cooling plate 10 of the battery module it is in, and the other end is in contact with the liquid cooling plate 10 of the adjacent battery module, thus achieving double-sided liquid cooling of the core stack 30. Furthermore, this double-sided liquid cooling has no stacking limit; as the number of stacked layers increases, the core stack 30 of the newly added battery module can maintain the effect of double-sided liquid cooling. That is, the battery module of this application can adjust the number of stacked layers as needed, flexibly adapting to different assembly space dimensions and changing the energy storage limit while ensuring cooling effect.

[0034] In conjunction with the first aspect, according to one embodiment of this application, the battery module further includes thermally conductive adhesive sandwiched between the liquid cooling plate 10 and the core stack 30.

[0035] In this embodiment, thermally conductive adhesive is disposed between the liquid cooling plate 10 and the core stack 30. On the one hand, the thermally conductive adhesive has a higher thermal conductivity than air. After filling the gap between the core stack 30 and the liquid cooling plate 10, the thermally conductive adhesive can form a stable heat conduction channel, uniformly transfer the heat generated by the core stack 30 to the liquid cooling plate 10, reduce the temperature difference between the core stack 30 and the liquid cooling plate 10, and accelerate the heat dissipation of the core stack 30. On the other hand, the thermally conductive adhesive filling the gap between the core stack 30 and the liquid cooling plate 10, especially filling the structural gap on one side of the core stack 30, can improve the bonding stability and durability of the core stack 30 and the liquid cooling plate 10. For a core stack 30 formed by stacking multiple distributed cells 32, the thermally conductive adhesive filling the edge gaps of the cells 32 can also suppress the relative displacement between the cells 32 and maintain the structural integrity of the core stack 30.

[0036] Thermally conductive adhesives can be various substrates or forms of thermal interface materials. In terms of substrate composition, exemplary thermally conductive adhesives include silicone-based, epoxy-based, acrylate-based, and polyurethane-based thermally conductive adhesives. In terms of form, the thermally conductive adhesive can be a pre-formed sheet, pressed between the core stack 30 and the liquid cooling plate 10, directly bonding the two or bonding them after heating and plasticizing; alternatively, the thermally conductive adhesive can be a fluid liquid, brushed into the accommodating space and covering the surface of the liquid cooling plate 10, bonding and fixing it to the core stack 30 after installation. The above are merely preferred examples; those skilled in the art can determine the specific type of thermally conductive adhesive based on thermal conductivity, dielectric strength, curing shrinkage, thickness tolerance, and assembly process compatibility.

[0037] Please refer to the above as well. Figure 3 and Figure 4 In conjunction with the first aspect, according to one embodiment of this application, the core stack 30 includes an elastic sheet 31 and a battery cell 32, a plurality of battery cells 32 are stacked in a first direction, the elastic sheet 31 is sandwiched between adjacent battery cells 32, the natural length of the core stack 30 in the first direction is L1, the length of the accommodating space in the first direction is L2, and L1 > L2.

[0038] In this embodiment, the core stack 30 includes battery cells 32 and elastic sheets 31 stacked in the first direction. Since the natural length of the core stack 30 in the first direction is greater than the length of the accommodating space in the first direction, when the core stack 30 is placed in the accommodating space, the actual length of the core stack 30 in the first direction is less than its natural length. At least the elastic sheet 31 is compressed. Therefore, under the elastic action, the battery cell 32 is subjected to pressure from the elastic sheet 31. That is, the internal force of the core stack 30 achieves the compression effect of the battery cell 32.

[0039] It is important to note that in most cases, the deformation of the core stack 30 is concentrated in the elastic sheet 31, while the battery cell 32 typically does not exhibit significant deformation. However, this does not mean that the battery cell 32 is free from deformation or cannot deform. The preload is set to compress the battery cell 32, fix its relative position, and ensure stable operation and electrical connection. In environments with significant vibration, such as power batteries, the preload can also prevent the battery cells 32 from rubbing against each other and generating wear debris. In other words, the technical solution of this embodiment generates preload by compressing the elastic deformation of the core stack 30. The specific location of the deformation does not necessarily have to be concentrated in the elastic sheet 31, and it does not even necessarily need to have an elastic sheet 31 structure that conforms to the rigid definition of a film, foam film, or spring sheet. An extreme example is that the core stack 30 only includes a plurality of stacked cells 32. In this case, the cells 32 are slightly compressed and pressed against each other during the installation process. Each deformed cell 32 also meets the above definition of the elastic sheet 31, that is, it is sandwiched between two adjacent cells 32. Therefore, the scope of protection of this application cannot be limited based on the existence of the elastic sheet 31 in the conventional sense.

[0040] Furthermore, the core stack 30 also includes a connecting bar, which is welded to the battery cell 32, and the battery cells 32 are connected in series and parallel through the connecting bar.

[0041] This embodiment discloses a specific electrical connection method inside the core stack 30. The connecting strips, which are welded together, are more stable and less prone to loosening during the deformation of the core stack 30, ensuring the stability of the series and parallel connection between the cells 32. Preferably, the connecting strips can be flexible to adapt to possible deformation of the core stack 30.

[0042] In conjunction with the first aspect, according to one embodiment of this application, the box panel 20 includes two first plates 21 and two second plates 22 arranged opposite to each other. The first plates 21 are fixedly connected to the liquid cooling plate 10. The two second plates 22 are respectively connected to the two first plates 21, and at least one second plate 22 is slidably sandwiched between the two first plates 21 to adjust the effective size of the accommodating space. The sliding direction of the second plate 22 is parallel to the extending direction of the first plate 21.

[0043] Inside a single battery module, a second plate 22 is slidably sandwiched between two first plates 21, so that the effective size of the accommodating space can be adjusted as needed. That is, the size of the stack 30 adapted to a single battery module and the upper limit of energy can also be adjusted as needed. Without changing the size and quantity of each component that makes up the battery module, the size adjustment and upper limit of energy at the battery module level are realized.

[0044] Specifically, the second plate 22 can be configured in at least two ways: one second plate 22 is fixedly connected to one end of the two first plates 21 and fixedly connected to the edge of the liquid cooling plate 10, and the other second plate 22 is slidably sandwiched between the two first plates 21 and connected to the surface of the liquid cooling plate 10 near the accommodating space; or, both second plates 22 are slidably sandwiched between the two first plates 21 and connected to the surface of the liquid cooling plate 10 near the accommodating space.

[0045] Furthermore, the first plate 21 extends in a first direction, and the core stack 30 includes a plurality of cells 32 stacked in the first direction.

[0046] The first plate 21 extends in the first direction, and the core stack 30 includes multiple cells 32 stacked in the first direction. The sliding direction of the second plate 22 is parallel to the extending direction of the first plate 21, that is, the sliding direction of the second plate 22 is consistent with the stacking direction of the cells 32. Therefore, when the number of cells 32 needs to be adjusted, sliding the second plate 22 can make way for the newly added cells 32, or press the core stack 30 to compensate for the size loss caused by removing the cells 32. That is, the capacity of the core stack 30 can be adjusted by simply removing the cell 32 closest to the second plate 22 or inserting a cell 32 near the second plate 22. The adjustment of the capacity of the core stack 30 does not involve the rearrangement of the remaining cells 32, and the adjustment process is convenient and easy to operate.

[0047] In conjunction with the first aspect, according to one embodiment of this application, the connection method between the liquid cooling plate 10 and the casing 20 is one or more of welding, plugging, bonding, and riveting. For battery module working environments where the size of the accommodating space needs to be adjusted, plugging or riveting is preferred; for cases where the size of a single battery module core stack 30 is fixed, welding or riveting is preferred.

[0048] Secondly, this application also provides a battery box, including a plurality of battery modules of any of the above embodiments, wherein the plurality of battery modules are stacked such that the core stack 30 and the liquid cooling plate 10 are stacked alternately.

[0049] Because the battery box disclosed in the second aspect of this application includes the battery modules disclosed in the first aspect, the battery box disclosed in the second aspect of this application also possesses the various technical effects of the first aspect. Specifically, because multiple battery modules are stacked, the core stack 30 and the liquid cooling plate 10 are stacked alternately. Therefore, the core stack 30 is sandwiched by the liquid cooling plates 10 on both sides, achieving a double-sided liquid cooling effect, and each layer of battery modules can have a good cooling effect. At the same time, because each battery module includes a core stack 30 and a liquid cooling plate 10, the number of stacking layers can be flexibly adjusted according to the size requirements and energy storage capacity requirements of the battery box to meet the requirements, without having to redesign the battery box according to each requirement.

[0050] It is important to note that in multi-layer stacking, although most of the cell stacks 30 within the battery modules are sandwiched between two layers of liquid cooling plates 10, strictly speaking, the direction normal to the side of any liquid cooling plate 10 facing its corresponding accommodating space is defined as the second direction. The cell stack 30 furthest in the second direction, because it no longer receives a liquid cooling plate 10 from another battery module, can only be attached to the liquid cooling plate 10 corresponding to its own battery module, receiving only unilateral liquid cooling rather than bilateral liquid cooling. In practical applications, this special cell stack 30 usually does not require special treatment. Firstly, its location is at the edge of the cell stack 30, where there is no heat accumulation, its temperature is low, its heat dissipation power is small, and it is less prone to thermal runaway. Secondly, although one side of its surface is not liquid-cooled, it has stronger convective heat transfer compared to other cell stacks 30, thus maintaining good heat dissipation. Under special operating conditions, those skilled in the art can also, as needed, install an independent liquid cooling plate 10 or other cooling components at the furthest point in the second direction to supplement the cooling power.

[0051] In conjunction with the second aspect, according to one embodiment of this application, it further includes a thermally conductive adhesive sandwiched between adjacent battery modules.

[0052] Similar to the thermally conductive adhesive inside the battery module, the thermally conductive adhesive sandwiched between adjacent battery modules also has at least the following two technical effects: Firstly, the thermally conductive adhesive has a higher thermal conductivity than air. After filling the gap between the core stack 30 and the liquid cooling plate 10, it can form a stable heat conduction channel, uniformly transfer the heat generated by the core stack 30 to the liquid cooling plate 10, reduce the temperature difference between the core stack 30 and the liquid cooling plate 10, and accelerate the heat dissipation of the core stack 30. Secondly, the thermally conductive adhesive filling the gap between the core stack 30 and the liquid cooling plate 10, especially filling the structural gap on one side of the core stack 30, can improve the bonding stability and durability between the core stack 30 and the liquid cooling plate 10, and between battery modules. For a core stack 30 formed by stacking multiple distributed cells 32, the thermally conductive adhesive filling the edge gaps of the cells 32 can also suppress the relative displacement between the cells 32 and maintain the structural integrity of the core stack 30.

[0053] In conjunction with the second aspect, according to one embodiment of this application, the battery box further includes an electrical module, through which each battery module is electrically connected. The battery box may also include a vehicle mounting module, a box sealing module, etc., which can be configured as needed based on experience by those skilled in the art.

[0054] The beneficial effects of the second aspect can be referred to in the first aspect or any possible implementation of the first aspect, and will not be elaborated here. Based on the implementations provided in the above aspects, this application can also be further combined to provide more implementations.

[0055] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0056] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0057] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0058] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the design concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery module, characterized in that, include: Liquid cooling plate; Multiple panels are connected to the liquid cooling plate, and the liquid cooling plate and the multiple panels together form an accommodating space. The core stack is disposed within the accommodating space and is in contact with the liquid cooling plate.

2. The battery module according to claim 1, characterized in that, The battery module also includes thermally conductive adhesive, which is sandwiched between the liquid cooling plate and the core stack.

3. The battery module according to claim 1, characterized in that, The core stack includes an elastic sheet and a battery cell. A plurality of the battery cells are stacked in a first direction. The elastic sheet is sandwiched between adjacent battery cells. The natural length of the core stack in the first direction is L1, and the length of the accommodating space in the first direction is L2, where L1 > L2.

4. The battery module according to claim 3, characterized in that, The core stack also includes a connecting bar, which is welded to the battery cell, and the battery cells are connected in series and parallel through the connecting bar.

5. The battery module according to claim 1, characterized in that, The box panel includes two first plates and two second plates arranged opposite to each other. The first plates are fixedly connected to the liquid cooling plate. The two second plates are respectively connected to the two first plates, and at least one second plate is slidably sandwiched between the two first plates to adjust the effective size of the accommodating space. The sliding direction of the second plate is parallel to the extension direction of the first plate.

6. The battery module according to claim 5, characterized in that, The first plate extends in a first direction, and the core stack includes a plurality of cells stacked in the first direction.

7. The battery module according to claim 1, characterized in that, The connection method between the liquid cooling plate and the box plate is one or more of welding, plugging, bonding and riveting.

8. A battery box, characterized in that, The battery module includes any one of claims 1-7, wherein the battery modules are stacked such that the core stack and the liquid cooling plate are stacked alternately.

9. The battery box according to claim 8, characterized in that, It also includes thermally conductive adhesive, which is sandwiched between adjacent battery modules.

10. The battery box according to claim 8 or 9, characterized in that, It also includes an electrical module, through which each of the battery modules is electrically connected.

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