Battery housing assembly, battery and battery pack

Abstract

Battery housing assembly, wherein the battery housing assembly comprises the following: a housing that has a first wall in a first direction; an electrode column arranged on the first wall, wherein the electrode column comprises an electrode column body and a first projection section, wherein the first projection section is arranged on an outer circumferential side of the electrode column body, and wherein at least a part of the projection of the first projection section overlaps the first wall in the first direction; an insulating element, wherein at least a part of the insulating element is arranged between the first wall and the first projection section, and where k is a high-temperature pressure load change rate of the insulating element, where k is the rate of change of the thickness of the insulating element when subjected to a pressure load of 0.2 kg at 400°C for 10 minutes; where the distance between the first wall and the first projection section in the first direction is d, and where the above parameters satisfy the following: 2 mm ≤ dk ≤ 150 mm .

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of power batteries, in particular a battery housing assembly, a battery and a battery pack. BACKGROUND

[0002] Power batteries are a type of battery used as a power source for tools and typically consist of a metal casing, an electrical core located within the casing, and a cover plate attached to the top of the casing. The cover plate contains an electrode column structure that transfers electrical energy within the power battery. Consequently, the inherent stability of the electrode column structure directly affects the power battery's performance. The electrode column and the casing are usually insulated from each other by an insulating element to prevent short circuits. However, during the battery's charge and discharge cycles, insulation failure between the electrode column and the casing can easily occur, leading to a short circuit. DESCRIPTION OF THE INVENTION

[0003] The purpose of the present application is to provide a battery housing assembly, a battery and a battery set in which a housing, an electrode column and an insulating element are matched in such a way that the insulating capacity of the insulating element and the heat dissipation performance of the electrode column meet the requirements of the battery, while optimizing the space utilization of the battery.

[0004] To achieve the above purpose, the present application provides the following technical solutions:

[0005] Battery housing assembly used for batteries, wherein the battery housing assembly comprises the following: a housing that has a first wall in a first direction; an electrode column arranged on the first wall, wherein the electrode column comprises an electrode column body and a first projection section, wherein the first projection section is arranged on an outer circumferential side of the electrode column body, and wherein at least a part of the projection of the first projection section overlaps the first wall in the first direction; an insulating element, wherein at least a part of the insulating element is arranged between the first wall and the first projection section, and where k is a high-temperature pressure load change rate, where k is the rate of change of the thickness of the insulating element when subjected to a pressure load of 0.2 kg at 400°C for 10 minutes; where d is the distance between the first wall and the first projection section in the first direction, and where the above parameters satisfy the following: 2 mm≤dk≤150 mm.

[0006] Based on the above battery housing assembly, the present application further provides a battery comprising the above battery housing assembly and an electrical core, wherein the electrical core is arranged inside the housing, wherein the electrical core comprises an electrical core body and an electrode tab, wherein the electrode tab is electrically connected to the electrical core body, and wherein the electrode tab is electrically connected to the electrode column.

[0007] Based on the above battery, the present application further provides a battery set comprising at least two of the above batteries and a current busbar, wherein the current busbar is electrically connected to the electrode columns of the two batteries.

[0008] In comparison to the prior art, the battery housing assembly, the battery and the battery pack in the embodiments of the present application have the following advantageous effects:

[0009] In the battery housing assembly of the present application, the housing, the electrode column and the insulating element correspond to each other by adapting the housing, the electrode column and the insulating element such that the high-temperature pressure load change rate k of the insulating element and the distance d between the first wall and the first projection section in the first direction satisfy the following: 2 mm≤dk≤150 mm. Consequently, the insulating element retains its shape during battery operation, even when subjected to the pressure of the electrode column and housing, as well as the heat conducted by the electrode column. This prevents bending or deformation at the interface between the first wall and the insulating element, thus avoiding the risk of the first wall overlapping with the electrode column. In this way, the insulating element's insulating capacity is maintained to meet the battery's operating requirements. Furthermore, this arrangement ensures adequate clearance between the housing and the electrode column. As a result, heat from the electrode column can be rapidly dissipated through the housing during battery operation, ensuring that the electrode column's heat dissipation performance meets the battery's operating requirements.The battery and battery pack of the present application use the above battery housing assembly and exhibit the advantageous effects of the battery housing assembly. DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a schematic representation of a battery housing assembly in an embodiment of the present application; Fig. Figure 2 shows a schematic representation of the substructure of the battery housing assembly in an embodiment of the present application; Fig. Figure 3 shows an enlarged representation of A in Fig. 2; Fig. Figure 4 shows a schematic representation of a first battery in an embodiment of the present application; Fig. 5 shows a top view of the structure in Fig. 4; Fig. Figure 6 shows a cross-sectional view of BB in Fig. 5; Fig. Figure 7 shows an enlarged representation of C in Fig. 6; Fig. Figure 8 shows an enlarged representation of D in Fig. 7; Fig. Figure 9 shows a schematic representation of a second battery in an embodiment of the present application; Fig. Figure 10 shows a top view of the structure in Fig. 9; Fig. Figure 11 shows a sectional view of EE in Fig. 10; Fig. Figure 12 shows an enlarged representation of F in Fig. 11; Fig. Figure 13 shows an enlarged representation of G in Fig. 12; Fig. Figure 14 shows a schematic representation of a third battery in an embodiment of the present application; Fig. Figure 15 shows a top view of the structure in Fig. 14; Fig. Figure 16 shows a cross-sectional view of HH in Fig. 15; Fig. Figure 17 shows an enlarged representation of I in Fig. 16; Fig. Figure 18 shows an enlarged representation of J in Fig. 17; Fig. Figure 19 shows a schematic representation of an electrode column in an embodiment of the present application; Fig. Figure 20 shows an enlarged representation of K in Fig. 7; Fig. Figure 21 shows a schematic exploded view of the battery housing assembly in an embodiment of the present application, wherein the electrode column is arranged on a cover plate; Fig. Figure 22 shows a schematic representation of the cross-sectional area of ​​the battery housing assembly in an embodiment of the present application, wherein the electrode column is removed from the cover plate; Fig. Figure 23 shows a schematic CT representation of the battery housing assembly without insulation failure; Fig. Figure 24 shows a schematic CT view of the battery housing assembly with an insulation failure. Reference symbol list: 100 battery housing assembly; 200 battery; X first direction; 1 housing; 1a first wall; 1a1 Wall body; 1a2 second lead section; 1b Main housing body; 1c Cover plate; 1d opening; 2 electrode columns; 2a Electrode column body; 2b first lead section; 2c first metal layer; 2d second metal layer; 2e third lead section; 3 insulating element; 4 through holes. DETAILED EXECUTION FORMS

[0010] Detailed embodiments of the present application are described in more detail below in conjunction with the accompanying drawings and examples. The following examples serve to illustrate the present application but are not intended to limit its scope.

[0011] In the description of this application, it should be noted that an element described as being "attached" or "arranged" to another element may be arranged directly or indirectly on that other element. Similarly, when an element is described as being "connected to" another element, it may be connected to that other element directly or indirectly. In the description of this application, it should be noted that terms such as "mounted," "connected," and "attached" are to be interpreted broadly, for example, as either a fixed connection, a detachable connection, or a one-piece connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium, or a connection within two elements. The specific meaning of the above terms in this application is clear to a person competent in the field.

[0012] In the description of the present application, it is to be understood that the terms, e.g., "height", "top", "bottom", "vertical", "horizontal", "above", "below", "inside", "outside", which indicate the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, serve only for the sake of simplicity and to simplify the description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation or be designed and operated with a particular orientation, and are therefore not to be understood as a limitation of the present application.

[0013] In the description of this application, it should be understood that terms such as "first", "second", etc., serve only to describe the purpose and are not to be understood as indicating their relative importance or implicitly defining the number of the specified technical features. Consequently, features marked "first" or "second" may expressly or implicitly include one or more of these features. Examples of implementation

[0014] As in the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23 to Fig. As shown in Figure 24, the embodiment of the present application provides a battery housing assembly 100 suitable for a power battery 200. If, for example, an output interface of the power battery 200 faces the front, the side opposite the front is the rear, and the front-to-rear direction is defined as the first direction X of this embodiment. The battery housing assembly 100 comprises a housing 1, an electrode column 2, and an insulating element 3. The housing 1 has a first wall 1a in the first direction X, the first wall 1a being provided with an installation hole extending through the first direction X.

[0015] In this embodiment, the electrode column 2 serves as a current output of the battery housing assembly 100. The electrode column 2 is arranged on the first wall 1a, and the electrode column 2 is passed through the installation hole such that a part of the electrode column 2 extends through the installation hole and to the front of the installation hole, and the electrode column 2 comprises an electrode column body 2a and a first projection section 2b, wherein the electrode column body 2a extends in the first direction X, wherein the first projection section 2b is arranged on an outer circumferential side of the electrode column body 2a, and wherein at least a part of the projection of the first projection section 2b in the first direction X overlaps the first wall 1a.

[0016] At least a part of the insulating element 3 is arranged between the first wall 1a and the first projection section 2b, wherein the high-temperature pressure load change rate of the insulating element 3 is k, where the high-temperature pressure load change rate k is the rate of change of the thickness of the insulating element when subjected to a pressure load of 0.2 kg at 400°C for 10 minutes; wherein the distance between the first wall 1a and the first projection section 2b in the first direction is d, and wherein the above parameters satisfy the following: 2 mm≤dk≤150 mm.

[0017] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (1) can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 150 mm.

[0018] It should be noted that the casing 1 serves to encapsulate components such as the electrical core and the electrolyte. The casing 1 can have various shapes and dimensions, for example, rectangular prisms or hexagonal prisms, with the shape of the casing 1 being determined by the specific shape and dimensions of the electrical core. The material of the casing 1 can be varied, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0019] It should be noted that the electrode column 2 serves as a conductive component connecting the internal electrode of the battery 200 to the external circuit. The material of the electrode column 2 typically exhibits high electrical conductivity, corrosion resistance, and mechanical strength, such as aluminum (Al) or aluminum alloy, copper (Cu), or nickel-plated copper, etc. In certain high-voltage applications, the electrode column 2 may also have a copper-aluminum composite structure. Furthermore, the surface of the electrode column 2 may be coated, for example, with nickel, silver, etc., to improve corrosion resistance and solderability and to ensure long-term stable operation of the battery 200.

[0020] Several fitting structures are located between housing 1 and electrode column 2. With reference to Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12 to Fig. 13 In some batteries 200, the casing 1 extends to the front of the first protruding section 2b of the electrode column 2. Alternatively, with reference to Fig. 14, Fig. 15, Fig. 16, Fig. 17 to Fig. 18. In some batteries 200, the first projecting section 2b of the electrode column 2 extends to the front of the casing 1. It is understood that both the casing 1 and the electrode column 2 are typically electrically conductive; therefore, the insulating element 3 is arranged between the first wall 1a and the electrode column 2 to serve as an electrical insulating structure between the casing 1 and the electrode column 2. The material of the insulating element 3 typically exhibits insulating properties, chemical corrosion resistance, and high-temperature stability, such as polypropylene (PP), polyphenylene sulfide (PPS), nylon (PA66), liquid crystal polymer (LCP), modified phenolic resin, etc. Of course, the insulating element can be configured with different structural profiles according to the specifications of the battery casing assembly 100 itself.Consequently, in some batteries 200, only a part of the structure of the insulating element 3 needs to be arranged between the first wall 1a and the first projection section 2b to achieve electrical insulation between the first wall 1a and the first projection section 2b.

[0021] It should be noted that the high-temperature pressure stress change rate k of the insulating element 3 reflects the degree of deformation of the insulating element 3 under certain temperature conditions. Therefore, if the ratio between the high-temperature pressure stress change rate k of the insulating element 3 and the distance d between the first wall 1a and the first projection section 2b in the first direction X is too low, the pressure exerted on the insulating element 3 by the electrode column 2 and the housing 1 can easily lead to deformation of the insulating element 3 under conditions of significant heat generation within the battery 200. This can subsequently lead to deformation and bending at the junction between the first wall 1a, the first projection section 2b, and the insulating element 3.Furthermore, this deformation and bending can lead to further compression and deformation of the insulating element 3, resulting in misalignment between the electrode column 2, the housing 1, and the insulating element 3. This misalignment can cause the first wall 1a to overlap with the electrode column 2, leading to insulation failure of the battery 200 and a short circuit. A gap can also form between the electrode column 2 and the first wall 1a, resulting in an assembly error between the electrode column 2 and the housing 1. If the ratio between the high-temperature pressure stress change rate k of the insulating element 3 and the distance d between the first wall 1a and the first protruding section 2b in the first direction X is too large, this can easily lead to the insulating element 3 being too thick and the distance between the electrode column 2 and the housing 1 being too large.Consequently, during operation or charge / discharge cycles of battery 200, heat from electrode column 2 is difficult to dissipate to the housing 1. This impairs the heat dissipation performance of battery 200, increases heat generation, and raises the risk of thermal runaway. Furthermore, this arrangement results in poor space utilization in the first direction X for battery 200, leading to reduced energy density.

[0022] Therefore, the housing 1, the electrode column 2, and the insulating element 3 can be matched by ensuring that the ratio of the high-temperature pressure stress change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X is within the range specified by formula (1). Consequently, in the event of significant heat generation within the battery 200, the insulating element 3 can withstand both the pressure exerted by the electrode column 2 and the housing 1, as well as the heat conducted by the electrode column 2, without excessive deformation of the insulating element itself. This prevents deformation or bending at the junction between the first wall 1a, the first projection section 2b, and the insulating element 3.This prevents misalignment between the electrode column 2, the housing 1, and the insulating element 3, thus ensuring effective insulation for the battery 200. Furthermore, during operation or charge / discharge cycles of the battery 200, heat is immediately dissipated from the electrode column 2 to the housing 1, enabling efficient heat dissipation from the battery 200 and preventing the risk of thermal runaway.

[0023] It should be noted that the distance d between the first wall 1a and the first projection section 2b in the first direction X can be either the distance between the upper surface of the first projection section 2b in the first direction X and the first wall 1a or the distance between the lower surface of the first projection section 2b in the first direction X and the first wall 1a. Therefore, within the battery housing assembly 100, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X satisfies the range defined by formula (1).This can be the ratio of the distance d between the upper surface of the first projection section 2b in the first direction X and the first wall 1a to the high-temperature pressure load change rate k of the insulating element 3 that satisfies the range of formula (1), or the ratio of the distance between the lower surface of the first projection section 2b in the first direction X and the first wall 1a to the high-temperature pressure load change rate k of the insulating element 3 that satisfies the range of formula (1).

[0024] To obtain the high-temperature pressure change rate k of the insulating element 3, the present embodiment provides the following test procedure: A material granulate is cut from the insulating element 3, the material granulate having a thickness d1 of 0.2 mm, a length of 0.3 mm, and a width of 0.3 mm. The material granulate is then laid flat on a plate in its thickness direction. Subsequently, a flat weight of 0.2 kg is placed on the material granulate. Both the flat weight and the material granulate are then held at 400°C for 10 minutes. Afterward, the thickness d2 of the material granulate is measured, and the high-temperature pressure change rate k is calculated. k=(d1−d2)d1

[0025] It should be noted that the distance d between the first wall 1a and the first projection section 2b in the first direction X affects the thickness of the insulating element 3 between the first wall 1a and the first projection section 2b, and thus influences the deformation of the insulating element 3 under thermal conditions. If the distance d between the first wall 1a and the first projection section 2b in the first direction X is insufficient, the insulating element 3 may have an insufficient thickness. Under conditions of significant heat generation from the battery 200, thermal deformation of the insulating element 3 could impair its supporting function between the first wall 1a and the first projection section 2b, potentially leading to an overlap of the first wall 1a and the first projection section 2b.Conversely, if the distance d between the first wall 1a and the first projection section 2b in the first direction X is too large, the thickness of the insulating element 3 may become too great, potentially impairing the heat dissipation of the electrode column 2. Furthermore, an excessively thick insulating element 3 would occupy more space within the battery 200 in the first direction X, thereby reducing the battery 200's space utilization. Therefore, the distance d between the first wall 1a and the first projection section 2b in the first direction X should be appropriately controlled within a specific range. For example, in some batteries 200, the distance d between the first wall 1a and the first projection section 2b in the first direction X satisfies the following: 0.2 mm ≤ d ≤ 3.5 mm.For example, the distance d between the first wall 1a and the first projection section 2b in the first direction X can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or 3.5 mm.

[0026] It is understood that the high-temperature pressure stress change rate k of the insulating element 3 also influences its deformation under thermal conditions. If the high-temperature pressure stress change rate k of the insulating element 3 is too high, the insulating element 3 tends to deform under high temperature and high pressure. This can lead to contact between the electrode column 2 and the housing 1, resulting in an assembly defect between the electrode column 2 and the housing 1. Conversely, an excessively low high-temperature pressure stress change rate k of the insulating element 3 increases the complexity of the material manufacturing of the insulating element 3 and increases the production costs of the battery 200. Therefore, the high-temperature pressure stress change rate k of the insulating element 3 should also be appropriately controlled within a specific range.In some batteries 200, the high-temperature pressure load change rate k of the insulating element 3, for example, meets the following requirements: 2% ≤ k ≤ 38%. For example, the high-temperature pressure load change rate k of the insulating element 3 can be 2%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, or 38%.

[0027] With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17 to Fig. 18 In some batteries 200, the first wall 1a comprises a wall body 1a1 and a second projecting section 1a2, the second projecting section 1a2 extending beyond the first projecting section 2b in the first direction X (i.e., the front face of the first direction X), and at least part of the projection of the second projecting section 1a2 in the first direction X overlapping the first projecting section 2b. The second projecting section comprises a vertical section and a boundary section, the boundary section engaging the upper part of the electrode column. Consequently, the second projecting section 1a2 of the first wall 1a can engage externally with the first projecting section 2b of the electrode column 2, thereby limiting the position of the electrode column 2.In this type of battery 200, the insulating element 3 extends at least partially to the outside of the first projection section 2b in the first direction X and is positioned between the first projection section 2b and the second projection section 1a2. This ensures that the insulating element 3 is correctly installed between the first wall 1a and the electrode column 2. The interaction of the first projection section 2b and the second projection section 1a2 presses the electrode column firmly against the insulating element 3. This prevents misalignment of the insulating element 3 and ensures that the insulating capacity of the battery 200 is not impaired.

[0028] It should be noted that the wall body 1a1 and the second projection section 1a2 can form a connection fit via a connecting structure or can be a single-piece structure. As, for example, in Fig. As shown in Figure 12, the second projection section 1a2 and the wall body 1a1 are formed separately and connected to each other. For example, the second projection section 1a2 can be welded to the wall body 1a1 via a weld structure. The insulating element 3 is coated on the second projection section 1a2 and then pressed against the front face of the first projection section 2b to separate the second projection section 1a2 from the first projection section 2b. In this structure, the compressive force exerted by the second projection section 1a2 on the insulating element 3 is reduced. Consequently, the insulating element 3, the housing 1, and the electrode column 2 can establish a new fit.This arrangement prevents an overlap between the electrode column 2 and the housing 1 and simultaneously improves the heat dissipation efficiency and space utilization of the battery 200, wherein the high-temperature pressure load change rate of the insulating element 3 k is, wherein the distance between the first wall 1a and the first projection section 2b in the first direction X d is, and wherein the above parameters satisfy the following:. 2 mm≤dk≤148 mm.

[0029] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (2) can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 148 mm.

[0030] Of course, the second projecting section 1a2 and the wall body 1a1 can also form a single structure. At least part of the structure of the insulating element 3 is arranged between the second projecting section 1a2 and the first projecting section 2b, thus electrically isolating the second projecting section 1a2 from the first projecting section 2b. In the battery 200, where the second projecting section 1a2 and the wall body 1a1 form a single structure, the second projecting section 1a2 is typically pressed against the insulating element 3 by a rolling press operation. This arrangement results in a greater compressive force exerted by the second projecting section 1a2 on the insulating element 3. Consequently, the insulating element 3, the housing 1, and the electrode column 2 can form a new appositional relationship.This prevents deformation of the insulating element 3 and avoids misalignment and overlap between the electrode column 2 and the housing 1, wherein the high-temperature pressure load change rate of the insulating element 3 is k, wherein the distance between the first wall 1a and the first projection section 2b in the first direction is X d, and wherein the above parameters satisfy the following:. 2.4mm≤dk≤150mm≤150mm.

[0031] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (3) can be 2.4 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 150 mm.

[0032] It should be noted that the first protrusion section 2b can have different shape structures to adapt to different 200 batteries. In the Fig. 8 and Fig. In the battery 200 shown in Figure 13, the distance d between the first wall 1a and the first projection section 2b in the first direction X is the minimum distance between the first wall 1a and the first projection section 2b within the overlap area of ​​the projection in the first direction X.

[0033] It should be noted that the first projection section 2b is located on the outer circumferential side of the electrode column body 2a and typically extends in a direction facing the outer circumferential side of the electrode column body 2a. As shown in Fig. 2 to Fig. As shown in 3, the first projection section 2b extends into one of the Fig. 2 shown left side and right side facing the outside of the electrode column body 2a. Therefore, the overlap of at least part of the projection of the second projection section 1a2 in the first direction X with the first projection section 2b means that the second projection section 1a2 has a structure that is at least partially located in one of the directions shown. Fig. 2 shown in the left and right directions, and this extending structure extends to the front of the first projection section 2b, whereby at least part of the projection of the second projection section 1a2 in the first direction X overlaps the first projection section 2b.

[0034] The thickness (i.e., the length of the first projection section 2b in the first direction X) of the first projection section 2b, which serves as a support structure for the insulating element 3 and the second projection section 1a2, affects both the structural strength of the first projection section 2b and the structural fit between the electrode column 2 and the housing 1. In particular, when the structural dimensions of the battery 200 are fixed, changes in the thickness of the first projection section 2b affect the performance of the battery 200. If the thickness of the first projection section 2b is insufficient, its strength decreases, making this part prone to deformation. Conversely, if the thickness of the first projection section 2b is too great, the distance between the first projection section and the first wall 1a decreases.Consequently, during deformation of the insulating element, contact between the electrode column and the housing 1 becomes more likely. Therefore, the thickness of the first protrusion section 2b should be appropriately controlled within a certain range. In some batteries, the thickness of the first protrusion section 2b is h1, and the thickness h1 of the first protrusion section 2b satisfies the following: 0.3 mm ≤ h1 ≤ 7 mm. For example, the thickness h1 of the first protrusion section 2b can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or 7 mm.

[0035] It is understood that the thickness (i.e., the length of the second projection section 1a2 in the first direction X) of the second projection section 1a2, as a structure that fits together with the first projection section 2b, also influences the structural strength of the second projection section 1a2 and the structural fit between the electrode column 2 and the housing 1. If the thickness of the second projection section 1a2 is determined to be too small, this can lead to insufficient strength in this part, making it prone to deformation. Conversely, an excessive thickness of the second projection section 1a2 not only increases the heat dissipation stress near the electrode column 2 but also reduces the vertical space utilization of the battery 200. Therefore, the thickness of the second projection section 1a2 should be appropriately controlled within a certain range.In some batteries 200, the thickness of the second projecting section 1a2 h2 is , and the thickness h2 of the second projecting section 1a2 satisfies the following: 0.2 mm ≤ h2 ≤ 5 mm. For example, the thickness h2 of the second projecting section 1a2 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm or 5 mm.

[0036] Furthermore, it should be noted that the Battery 200 is generally configured according to standard specifications and dimensions, such that the thickness h1 of the first protrusion section 2b and the thickness h2 of the second protrusion section 1a2 are interrelated. In some Batteries 200, the thickness h2 of the second protrusion section 1a2 is typically smaller than the thickness h1 of the first protrusion section 2b. This arrangement ensures that heat from the electrode column 2 can be rapidly transferred through the second protrusion section 1a2 to the housing 1, thus guaranteeing good heat dissipation performance of the electrode column 2.

[0037] To ensure the connection strength between the electrode column 2 and the housing 1, with reference to Fig. Figure 21, as an example of this embodiment, shows that in some batteries 200 the first wall 1a is provided with a through-hole 4. At least a portion of the electrode column body 2a is arranged within the through-hole, with the first projecting section 2b extending from the through-hole 4. Consequently, the electrode column 2 is embedded in the through-hole 4, with its position being limited by the through-hole 4. This improves the bond strength between the electrode column 2 and the housing 1 and prevents excessive pressure on the insulating element 3 under high-temperature conditions, which could lead to deformation and failure.In this structure, the high-temperature pressure load of the insulating element 3 is improved, wherein the high-temperature pressure load change rate of the insulating element 3 is k, where the distance between the first wall 1a and the first projection section 2b in the first direction is X d, and where the above parameters satisfy the following:. 2 mm≤dk≤145 mm.

[0038] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (4) can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 145 mm.

[0039] To better achieve the limiting function of the first wall 1a, in some battery housing assemblies 100 extends, with reference to Fig. 20, the electrode column body 2a extends in the first direction X towards the rear of the first wall 1a. Furthermore, the electrode column body 2a is provided with a third projecting section 2e. The third projecting section 2e is distributed in the outer circumferential direction of the electrode column body 2a and extends towards the outside of the electrode column body 2a. The third projecting section 2e serves for connection with an adapter film, the projection direction of the third projecting section 2e being parallel to the extension direction of the first wall 1a. This increases the connection strength between the electrode column 2 and the adapter film, thereby reinforcing the assembly strength between the electrode column 2 and the housing 1 by means of the adapter film's boundary.

[0040] With reference to the Fig. 14, Fig. 15, Fig. 16, Fig. 17 to Fig. 18 In some batteries 200, the first projection section 2b extends to the outside of the first wall 1a in the first direction X. The outside of the first wall 1a in the first direction X is typically the outer surface of the battery 200. Furthermore, at least part of the projection of the first projection section 2b in the first direction X overlaps the first wall 1a. In this way, the first projection section 2b engages with the outside of the first wall 1a, thereby limiting the position of the electrode column 2. In this type of battery 200, the insulating element 3 extends at least partially to the outside of the first wall 1a in the first direction X and is positioned between the first projection section 2b and the first wall 1a to ensure that the electrode column 2 is pressed firmly against the insulating element 3.This prevents misalignment of the insulating element 3 and ensures that the insulation capacity of the battery 200 is not impaired.

[0041] It should be noted that in the Fig. 14, Fig. 15, Fig. 16, Fig. 17 to Fig. In the battery 200 shown in Figure 18, the first projection section 2b is also made of conductive material. Furthermore, the first projection section 2b and the electrode column body 2a can be connected to each other via a connection structure, for example a welded structure, to establish an electrically conductive connection between the first projection section 2b and the electrode column body 2a.

[0042] Since the first projection section 2b extends to the outside of the first wall 1a in the first direction X, the insulating element 3 is arranged between the first projection section 2b and the first wall 1a. Compared to the one in the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12 to Fig. Battery 200, shown in 13, exhibits the characteristics described in the Fig. 14, Fig. 15, Fig. 16, Fig. 17 to Fig. In the battery 200 shown in Figure 18, a reduced contact area exists between the insulating element 3 and the electrode column body 2a. This reduces the heat transferred from the electrode column body 2a to the insulating element 3, thereby reducing the heat absorbed by the insulating element 3. Consequently, the insulating element 3, the housing 1, and the electrode column 2 can form a new, optimized relationship. This further ensures the heat dissipation efficiency and space utilization of the battery 200, while avoiding an overlap between the electrode column 2 and the housing 1, where the high-temperature pressure load change rate of the insulating element 3 is k, where the distance between the first wall 1a and the first projection section 2b in the first direction is X d, and where the above parameters satisfy the following: 2 mm≤dk≤147 mm.

[0043] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (5) can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 147 mm.

[0044] It should be noted that the first protrusion section 2b can have different shape structures to adapt to different 200 batteries. In the Fig. 17 to Fig. In the battery 200 shown in Figure 18, the distance d between the first wall 1a and the first projection section 2b in the first direction X is the minimum distance between the first wall 1a and the first projection section 2b within the overlap area of ​​the projection in the first direction X.

[0045] In the Fig. 14, Fig. 15, Fig. 16, Fig. 17 to Fig. In the battery 200 shown in Figure 18, the first projecting section 2b and the insulating element 3 are supported by the first wall 1a. To ensure that the first wall 1a has sufficient structural strength and to prevent deformation, its thickness must also be controlled. If the thickness of the first wall 1a is too small, its structural strength is insufficient, making it susceptible to deformation. Conversely, if the thickness of the first wall 1a is too large, the space utilization of the battery 200 is impaired, making assembly and installation more difficult. In some batteries 200, the thickness of the first wall 1a is h3, and the thickness h3 of the first wall 1a satisfies the following: 0.3 mm ≤ h3 ≤ 7 mm. For example, the thickness h3 of the first wall 1a can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm or 7 mm.

[0046] In some Batteries 200, the insulating element 3 can be made of materials with a low high-temperature pressure change rate k, such as modified phenolic resin, thermally cured PI (thermally cured polyimide), cross-linked ETFE (cross-linked ethylene tetrafluoroethylene copolymer), PE (polyethylene), PP (polypropylene), etc. The high-temperature pressure change rate k of these materials meets the following requirements: 2% ≤ k ≤ 30%, thus preventing deformation of the insulating element 3. This improves the fit between the electrode column 2 and the casing 1 while maintaining the original structure of the Batteries 200. Naturally, in this type of Batteries 200, the insulating element 3, the casing 1, and the electrode column 2 can also establish a new fit relationship.This arrangement prevents an overlap between the electrode column 2 and the housing 1 and simultaneously improves the heat dissipation efficiency and space utilization of the battery 200, wherein the high-temperature pressure load change rate of the insulating element 3 k is, wherein the distance between the first wall 1a and the first projection section 2b in the first direction X d is, and wherein the above parameters satisfy the following:. 2 mm≤dk≤145 mm.

[0047] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (6) can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 145 mm.

[0048] It should be noted that the first projecting section 2b is located on the outer circumferential side of the electrode column body 2a and normally forms a stepped position with the electrode column body 2a. Within the structure of the battery 200, at least a portion of the insulating element 3 is located within this stepped position, thereby facilitating heat dissipation from the electrode column 2 via the insulating element 3 and the housing 1. This arrangement prevents an air gap between the electrode column 2 and the insulating element 3, which could otherwise impair the heat dissipation effect of the electrode column 2.

[0049] To improve the heat dissipation efficiency of electrode column 2, electrode column 2 can be modified in some battery housing assemblies 100 with reference to Fig. 1. be made from a composite material of several metallic materials. As in Fig. As shown in Figure 19, the electrode column 2 comprises, for example, a first metal layer 2c and a second metal layer 2d, with the first metal layer 2c located at the front of the second metal layer 2d. The thermal conductivity of the second metal layer 2d is greater than that of the first metal layer 2c. For example, the first metal layer 2c can be made of aluminum, while the second metal layer 2d can be made of copper. This facilitates welding the electrode column 2 to the busbar and improves the thermal conductivity of the electrode column 2. As the thermal conductivity of the electrode column 2 increases, the heat absorbed by the insulating element 3 naturally decreases. Consequently, the insulating element 3, the housing 1, and the electrode column 2 can establish a new matching relationship.This arrangement prevents an overlap between the electrode column 2 and the housing 1 and simultaneously improves the heat dissipation efficiency and space utilization of the battery 200, wherein the high-temperature pressure load change rate of the insulating element 3 k is, wherein the distance between the first wall 1a and the first projection section 2b in the first direction X d is, and wherein the above parameters satisfy the following:. 3 mm≤dk≤150 mm.

[0050] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (7) can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 150 mm.

[0051] It is understood that, since the thermal conductivity of the second metal layer 2d is greater than that of the first metal layer 2c, a larger proportion of the second metal layer 2d within the electrode column 2 results in faster heat dissipation efficiency. Since the first metal layer 2c is typically used for welding to the power busbar, if the second metal layer 2d occupies too large a proportion of the electrode column 2, it will also compress the volume of the first metal layer 2c, thus impairing the weld strength between the electrode column 2 and the power busbar. If the first metal layer 2c occupies an excessive proportion of the electrode column 2 while the second metal layer 2d occupies an insufficient proportion, this can lead to insufficient heat dissipation from the electrode column 2.As a result, the insulating element 3 can deform under thermal stress, leading to insulation failure. Therefore, in some battery casing assemblies 100, the thickness of the first metal layer 2c in the first direction X is designated as H1 and the thickness of the second metal layer 2d in the first direction X is designated as H2. These fulfill the following requirements: 0.3≤H1H2≤4.8. Consequently, the battery housing assembly 100 achieves a balanced effect between weldability and thermal conductivity.

[0052] For example, the ratio of the thickness H1 of the first metal layer 2c in the first direction X to the thickness H2 of the second metal layer 2d in the first direction X can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 4.8.

[0053] For example, the thickness H1 of the first metal layer 2c in the first direction X can be 1 mm ≤ H1 ≤ 10 mm; for example, it can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. The thickness H2 of the second metal layer 2d in the first direction X can be 0.2 mm ≤ H1 ≤ 4 mm. For example, it can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm.

[0054] In some battery housing assemblies 100, as in Fig. As shown in Figure 21, the housing 1 comprises a housing body 1b and a cover plate 1c, wherein the housing body 1b is provided at least at one end with an opening 1d, and the cover plate 1c closes the opening 1d, so that the cover plate 1c forms the first wall 1a. The electrode column 2 is arranged on the cover plate 1c, the thickness of the cover plate 1c being greater in the first direction X than the wall thickness of the housing body 1b. Within this type of battery housing assembly 100, the insulating element 3 is susceptible to compression by the electrode column 2 and the cover plate 1c; therefore, the insulating element 3, the housing 1, and the electrode column 2 can also establish a new fit relationship.This arrangement prevents an overlap between the electrode column 2 and the housing 1 and simultaneously improves the heat dissipation efficiency and space utilization of the battery 200, where the high-temperature pressure load change rate of the insulating element is k, where the distance between the first wall and the first projection section in the first direction is d, and where the above parameters satisfy the following:. 2 mm≤dk≤148 mm.

[0055] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (8) can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 148 mm.

[0056] Of course, some battery housing assemblies can be rated 100 with reference to Fig. 22 also have the following structure: The housing 1 comprises a housing main body 1b and a cover plate 1c, wherein the housing main body 1b is provided at least at one end with an opening 1d, the cover plate 1c closing the opening 1d. Furthermore, the surface of the housing main body 1b running parallel to the cover plate 1c (i.e., the large area of ​​the cover plate 1c) forms a first wall 1a. In this type of battery housing assemblies 100, the welding position of the housing main body 1b and the cover plate 1c is away from the electrode column 2, thereby reducing the transfer of the heat generated during welding to the insulating element 3. This helps to prevent thermal deformation of the insulating element 3.Consequently, in this type of battery housing assembly 100, the insulating element 3, the housing 1 and the electrode column 2 can establish a new adaptation relationship, further ensuring the heat dissipation efficiency and space utilization of the battery 200, wherein the high-temperature pressure load change rate of the insulating element 3 is k, where the distance between the first wall 1a and the first projection section 2b in the first direction X d is, and where the above parameters satisfy the following:. 2 mm≤dk≤146 mm.

[0057] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (9) can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 146 mm.

[0058] It should be noted that an excessive distance between the electrode column 2 and the cover plate 1c must be avoided, as this could compromise the structural strength of the battery housing assembly 100. In the battery housing assembly 100 described above, the distance between the cover plate 1c and the surface of the main housing body 1b parallel to the cover plate 1c in the first direction X is typically limited. For example, if the distance between the cover plate 1c and the surface of the main housing body 1b parallel to the cover plate 1c in the first direction XL is XL, the distance L can satisfy the following: 40 mm ≤ L ≤ 700 mm. For example, the distance L can be 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 550 mm, 600 mm, 650 mm, 700 mm.

[0059] To verify, if both the high-temperature pressure stress change rate k of the insulating element 3 and the distance d between the first wall 1a and the first projection section 2b in the first direction X satisfy formula (1), whether, compared with other battery housing assemblies, the insulating element 3 of this battery housing assembly 100 can withstand both the pressure exerted by the electrode column 2 and the housing 1 and the heat transferred by the electrode column 2, and whether, during operation or charge / discharge cycles of the battery 200, the heat from the electrode column 2 can be dissipated promptly to the housing 1 to ensure effective heat dissipation of the battery 200 and to prevent the risk of thermal runaway of the battery 200, the following are performed as shown in Table 1 below:In this embodiment, 19 groups of tests were performed according to the high-temperature overlap test method and the heating test method of the electrode column:

[0060] In Table 1, test examples 1 to 15 refer to testing based on the structure of the battery housing assembly 100 according to this embodiment. Specifically, for the battery housing assemblies 100 in test examples 1 to 15, the high-temperature pressure change rate k of the insulating element 3 and the distance d between the first wall 1a and the first projection section 2b in the first direction X satisfy the requirements of the formula above. dk defined area. Comparison examples 1 to 4 represent other battery housing structures where the high-temperature pressure load change rate k of the insulating element 3 and the distance d between the first wall 1a and the first projection section 2b in the first direction X correspond to the formula above. dk do not meet the defined requirements.

[0061] High-temperature overlap test procedure: The battery casing assembly is placed in a high-temperature forced-air drying oven and held at 400°C for 10 minutes. It is then removed and placed in an environment at 25°C for 24 hours to cool. The casing assembly is then cut lengthwise, and the cut surface is measured with an image measuring device to determine the distance d between the first wall 1a and the first protruding section 2b in the first direction X. If the measurement shows that d is greater than 0.1 mm, the test is passed; if d is less than or equal to 0.1 mm, the test is failed. Before the battery casing assembly is subjected to the high-temperature overlap test, the distance between the electrode column and the insulating element is measured. Fig. 23 shown.

[0062] It should be noted that the battery housing assembly shown in test examples 1 to 15 and comparison examples 1 to 4 differs in the above high-temperature overlap test procedure only in the high-temperature pressure load change rate k of the insulating element 3 (i.e., the material of the insulating element 3) and in the distance d between the first wall 1a and the first projecting section 2b in the first direction X. The specification dimensions, the mounting dimensions, and the mounting fit relationships of the structural components, such as the housing, the cover plate, the electrode stack, the insulating element, and the sealing ring, are identical.

[0063] Electrode column heating test procedure: Connect electrode column 2 to the temperature sensor at 25°C and charge the battery with a constant current at a multiplication rate of 4C until the battery voltage reaches 3.65 V. Then switch to constant voltage charging until the battery current drops to 0.05C. Record the temperature change of the electrode column during the charging process. If the maximum temperature T of electrode column 2 is less than or equal to 48°C, the test result is considered satisfactory; if the maximum temperature T of electrode column 2 is greater than 48°C, the test result is considered unsatisfactory.

[0064] It should be noted that in the electrode column heating test procedure, 3.65 V is the nominal output voltage of lithium iron phosphate lithium-ion batteries, and 48°C is the safe operating temperature for lithium iron phosphate lithium-ion batteries. If other types of lithium batteries, such as ternary batteries, are used for testing, the battery voltage should reach 4.25 V when charged with a constant current at a multiplication rate of 4C, and the maximum electrode column temperature T should be set to 55°C.

[0065] It should be noted that the above heating test procedure of the electrode column uses a lithium-ion battery, in which the cathode material is lithium iron phosphate, as the test object, the lithium-ion battery being manufactured as follows:

[0066] Production of the cathode foil: Mixing the prepared active cathode material, the conductive agent acetylene black, and the binder PVDF in a mass ratio of 96:2:2, adding a solvent NMP, stirring under the action of a vacuum mixer until the system is homogeneous, then uniform application of the cathode slurry to both surfaces of the aluminum foil of the cathode collector, drying at room temperature and then further drying in an oven, then cold pressing, cutting to obtain a cathode foil. The active material of the cathode slurry in this test is lithium iron phosphate.

[0067] Production of the anode foil: Mixing a mixture of an active anode material (graphite or graphite with other active materials, e.g., silicon-based material) in different mass ratios, the conductive agent (acetylene black), the thickening agent (CMC), and the binder (SBR) according to a mass ratio of 96.4:1:1.2:1.4; adding a solvent of deionized water; stirring under the action of a vacuum mixer until the system is homogeneous to obtain an anode slurry; applying the anode slurry to both surfaces of the copper foil of the anode collector and drying at room temperature, followed by further drying in an oven; then cold pressing and cutting to obtain the anode foil.

[0068] Preparation of the electrolyte solution: Mix ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) in a volume ratio of 1:1:1 to obtain an organic solvent. Then dissolve LiPF6, a sufficiently dried lithium salt, in the mixed organic solvent and adjust the solution to a concentration of 1 mol / L.

[0069] Separator production: A polyethylene film is selected as the separator;

[0070] Manufacturing of lithium-ion batteries: The cathode foil, separator, and anode foil are stacked sequentially, with the separator positioned between the cathode foil and the anode foil to insulate them from each other. The foils are then wound to create a bare electrical core. This core is placed over the opening of the casing into the casing body. The cover plate is laser-welded to the casing body. After drying, the core is filled with electrolyte solution. Following vacuum encapsulation, settling, forming, shaping, and other processes, a lithium-ion battery is finally obtained. Table 1 d(mm) k d / k(mm) Überlappungstest Erhitzungstest derElektrodensäule Testbeispiel1 0,18 9 % 2,000 bestanden bestanden Testbeispiel2 0,2 4 % 5,000 bestanden bestanden Testbeispiel3 0,4 2 % 20,000 bestanden bestanden Testbeispiel4 0,8 1 % 80,000 bestanden bestanden Testbeispiel5 1,4 4 % 3,500 bestanden bestanden Testbeispiel6 2 21 % 9,524 bestanden bestanden Testbeispiel7 2,1 15 % 14,000 bestanden bestanden Testbeispiel8 2,3 21 % 10,952 bestanden bestanden Testbeispiel9 2,8 30 % 9,333 bestanden bestanden Testbeispiel10 3,2 38 % 8,421 bestanden bestanden Testbeispiel11 3,2 18 % 17,778 bestanden bestanden Testbeispiel12 3,5 34 % 10,294 passed passed Test example 13 3,6 2,4 % 150,000 passed passed Test example 14 3,7 3 % 123,333 passed passed Test example 15 0,47 12 % 3,9 passed passed Comparative example 1 0,6 33 % 1,818 failed passed Comparative example 2 26,9 17 % 158,235 passed failed Comparative example 3 0,17 41 % 0,415 failed passed Comparative example 4 3,7 1,8 % 205,55 passed failed

[0071] As can be seen from Table 1, the first wall 1a and the first projection section 2b maintain a sufficient distance under high-temperature conditions if both the high-temperature pressure stress change rate k of the insulating element 3 and the distance d between the first wall 1a and the first projection section 2b in the first direction X satisfy the range defined by formula (1). In the event of significant heat generation from the battery 200, the insulating element 3 can withstand both the pressure exerted by the electrode column 2 and the housing 1 and the heat transferred by the electrode column 2 without excessive deformation of the insulating element itself.Conversely, the insulating element cannot withstand the pressure from the electrode column and the housing if both the high-temperature pressure change coefficient k of the insulating element 3 and the distance d between the first wall 1a and the first projection section 2b in the first direction X are outside the range defined by the above formula (1). This leads to a significant reduction in the distance between the insulating element and the electrode column. As in . Fig. As shown in Figure 24, this easily leads to an overlap between the electrode column and the casing, resulting in poor insulation of the battery 200. Furthermore, the electrode column 2 cannot dissipate heat quickly, increasing the risk of thermal runaway in the battery 200.

[0072] Based on the above battery housing assembly 100, the exemplary embodiment further provides a battery 200, wherein the battery 200 comprises the above battery housing assembly 100 and an electrical core, the electrical core being arranged within the housing 1, the electrical core comprising an electrical core body and an electrode tab, the electrode tab being electrically connected to the electrical core body, and the electrode tab being electrically connected to the electrode column. Naturally, in some batteries 200 based on the above battery housing assembly 100, the first projecting section 2b is arranged externally on the first wall 1a.

[0073] Based on the above battery 200, the embodiment further provides a battery set, wherein the battery set comprises a current busbar and at least two above batteries 200, wherein the current busbar is electrically connected to the electrode columns of the two batteries 200.

[0074] It should be noted that significant heat is generated in the welding area of ​​the electrode column and the busbar during the welding process. This heat can lead to deformation of the insulating element 3, creating a gap between the electrode column 2 and the first wall 1a. This, in turn, can lead to insulation failure of the battery 200. The housing 1, the electrode column 2, and the insulating element 3 can be matched by ensuring that the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X is within the range specified by formula (1).Consequently, the insulating element 3 can withstand both the pressure exerted by the electrode column 2 and the housing 1, as well as the heat transferred by the electrode column 2, without excessive deformation of the insulating element itself. This prevents deformation or bending at the junction between the first wall 1a, the first projection section 2b, and the insulating element 3. This prevents misalignment between the electrode column 2, the housing 1, and the insulating element 3, thus ensuring effective insulation for the battery 200 and preventing the risk of thermal runaway in the battery 200.

[0075] When assembling the battery pack using battery 200 with the one in the Fig. 14, Fig. 15, Fig. 16, Fig. 17 to Fig.In the structure shown in Figure 18 (where the first wall 1a comprises a wall body 1a1 and a second projection section 1a2, the second projection section 1a2 extending to the outside of the first projection section 2b in the first direction X (i.e., the front of the first direction X), and at least part of the projection of the second projection section 1a2 in the first direction X overlaps the first projection section 2b, the insulating element extending at least partially to the outside of the first projection section 2b in the first direction X and being located between the first projection section 2b and the second projection section 1a2), the insulating element 3 is more susceptible to the heat generated during welding of the busbar.Therefore, in this type of battery pack, a new adaptation relationship must be established between the insulating element 3, the housing 1, and the electrode column 2 to prevent deformation of the insulating element 3 due to excessive heating, where the high-temperature pressure load change rate of the insulating element 3 is k, where the distance between the first wall 1a and the first projection section 2b in the first direction is X d, and where the above parameters satisfy the following: 4 mm≤dk≤150 mm.

[0076] For example, the ratio of the high-temperature pressure load change rate k of the insulating element 3 to the distance d between the first wall 1a and the first projection section 2b in the first direction X according to formula (10) can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 150 mm.

[0077] Furthermore, in this type of battery pack, the area of ​​the contact zone between the electrode stack and the busbar influences the heat transferred to the insulating element 3 or affects the performance of the battery 200. For example, an excessively small contact zone between the electrode stack and the busbar can result in an insufficient weld area, thus impairing the current-carrying capacity between the two. Conversely, an excessively large contact zone between the electrode stack and the busbar can cause the insulating element 3 to be too close to the weld point, increasing the risk of deformation due to the heat generated during welding. Therefore, in this type of battery pack, the contact zone between the electrode stack and the busbar should be within a suitable range.For example, the area of ​​the connection area between the electrode column and the busbar S and the area S of the connection area between the electrode column and the busbar fulfills the following: 3 mm. 2 ≤ S ≤ 320 mm 2 For example, the area S of the connection area between the electrode column and the current busbar can be 3 mm². 2 , 5 mm 2 , 10 mm 2 , 20 mm 2 , 30 mm 2 , 40 mm 2 , 50 mm 2 , 60 mm 2 , 70 mm 2 , 80 mm 2 , 90 mm 2 , 100 mm 2 , 110 mm 2 , 120 mm 2 , 130 mm 2 , 140 mm 2 , 150 mm 2 , 160 mm 2 , 170 mm 2 , 180 mm 2 , 190 mm 2 , 200 mm 2 , 210 mm 2 , 220 mm 2 , 230 mm 2 , 240 mm 2 , 250 mm 2 , 260 mm 2 , 270 mm 2 , 280 mm2 , 290 mm 2 , 300 mm 2 , 310 mm 2 , 320 mm 2 be.

[0078] In summary, in the battery housing assembly 100 of the present application, the housing 1, the electrode column and the insulating element correspond to each other by adapting the housing, the electrode column and the insulating element such that the high-temperature pressure load change rate k of the insulating element and the distance d between the first wall 1a and the first projection section 2b in the first direction satisfy the following: 2 mm≤dk≤150 mm. Consequently, the insulating element remains dimensionally stable during operation of the battery 200, even when subjected to the pressure of the electrode column and housing 1, as well as the heat transferred from the electrode column. This prevents bending or deformation at the connection point between the first wall 1a and the insulating element, thus avoiding the risk of the first wall 1a overlapping with the electrode column. In this way, the insulating element's insulating capacity is maintained to meet the operating requirements of the battery 200. Furthermore, this arrangement ensures an adequate distance between the housing 1 and the electrode column. Consequently, during operation of the battery 200, heat from the electrode column can be rapidly dissipated through the housing 1, ensuring that the electrode column's heat dissipation performance meets the operating requirements of the battery 200.The battery 200 and the battery pack of the present application use the above battery housing assembly 100 and exhibit the advantageous effects of the battery housing assembly 100.

[0079] The foregoing is only a preferred embodiment of the present application and it should be noted that for a person with ordinary knowledge in the field, a number of improvements and embellishments can be made without departing from the principles of the present application, while these improvements and embellishments also fall within the scope of protection of the present application.

[0080] The present application discloses a battery housing assembly, a battery, and a battery pack, and relates to the technical field of batteries, comprising a housing, an electrode column, and an insulating element, wherein the electrode column is arranged on the first wall, wherein the electrode column comprises an electrode column body and a first projection section, wherein the first projection section is arranged on an outer circumferential side of the electrode column body, wherein at least a part of the projection of the first projection section overlaps the first wall in the first direction; wherein at least a part of the insulating element is arranged between the first wall and the first projection section, wherein the high-temperature pressure load change rate k is, wherein the distance between the first wall and the first projection section in the first direction d is, and wherein the above parameters satisfy specified relationships.In this way, the housing, the electrode column, and the insulating element correspond to one another. During battery operation, the insulating element remains dimensionally stable, thus preventing deformation or bending at the junction between the first wall and the insulating element, thereby avoiding the risk of the first wall overlapping with the electrode column. The battery and battery pack of the present application use the above battery housing assembly and exhibit the advantageous effects of the battery housing assembly.

Claims

Battery housing assembly, wherein the battery housing assembly comprises: a housing having a first wall in a first direction; an electrode column arranged on the first wall, the electrode column comprising an electrode column body and a first projection section, the first projection section being arranged on an outer circumferential side of the electrode column body, and wherein at least a portion of the projection of the first projection section overlaps the first wall in the first direction; an insulating element, wherein at least a portion of the insulating element is arranged between the first wall and the first projection section, and wherein a high-temperature pressure load change rate of the insulating element k is, the high-temperature pressure load change rate k being the rate of change of the thickness of the insulating element when subjected to a pressure load of 0.2 kg at 400°C for 10 minutes;where the distance between the first wall and the first projection section in the first direction is d, and where the above parameters satisfy the following: 2 mm ≤ dk ≤ 150 mm .; Battery housing assembly according to claim 1, characterized in that the distance d between the first wall and the first projection section in the first direction satisfies the following: 0.2 mm ≤ d ≤ 3.5 mm. Battery housing assembly according to claim 1, characterized in that the high-temperature pressure load change rate k of the insulating element satisfies the following: 2% ≤ k ≤ 38%. Battery housing assembly according to claim 1, characterized in that the first wall comprises a wall body and a second projection section, wherein the second projection section extends to an outside of the first projection section in the first direction, and wherein at least a part of the projection of the second projection section overlaps the first projection section in the first direction, wherein the second projection section comprises a vertical section and a boundary section, the boundary section engaging in the upper part of the electrode column; wherein the insulating element extends at least partially to the outside of the first projection section in the first direction and is arranged between the first projection section and the second projection section. Battery housing assembly according to claim 4, characterized in that the second projection section and the wall body are formed separately from each other and connected to each other, wherein the high-temperature pressure load change rate of the insulating element is k, wherein the distance between the first wall and the first projection section in the first direction is d, and wherein the above parameters satisfy the following: 2 mm ≤ dk ≤ 148 mm . Battery housing assembly according to claim 4, characterized in that the second projection section and the wall body form a one-piece structure, wherein the high-temperature pressure load change rate of the insulating element is k, wherein the distance between the first wall and the first projection section in the first direction is d, and wherein the above parameters satisfy the following: 2.4 mm ≤ dk ≤ 150 mm . Battery housing assembly according to claim 4, characterized in that the thickness of the first projection section is h1, wherein the thickness h1 of the first projection section satisfies the following: 0.3 mm ≤ h1 ≤ 7 mm. Battery housing assembly according to claim 4, characterized in that the thickness of the second projection section is h2, and wherein the thickness h2 of the second projection section satisfies the following: 0.2 mm ≤ h2 ≤ 5 mm. Battery housing assembly according to claim 4, characterized in that the thickness h2 of the second projection section is smaller than the thickness h1 of the first projection section. Battery housing assembly according to claim 4, characterized in that the first wall is provided with a through-hole, wherein the first projecting section extends out of the through-hole, and wherein at least a part of the electrode column body is located within the through-hole, and wherein the high-temperature pressure load change rate of the insulating element is k, wherein the distance between the first wall and the first projecting section in the first direction is d, and wherein the above parameters satisfy the following: 2 mm ≤ dk ≤ 145 mm . Battery housing assembly according to claim 10, characterized in that the electrode column body extends beyond a rear side of the first wall in the first direction, wherein the electrode column body is provided with a third projection section extending in an outer circumferential direction of the electrode column body. Battery housing assembly according to claim 1, characterized in that the first projection section extends to the outside of the first wall in the first direction, wherein at least a part of the projection of the first projection section overlaps the first wall in the first direction, wherein the insulating element extends at least partially to the outside of the first wall in the first direction and is arranged between the first projection section and the first wall. Battery housing assembly according to claim 12, characterized in that the high-temperature pressure load change rate of the insulating element is k, wherein the distance between the first wall and the first projection section in the first direction is d, and wherein the above parameters satisfy the following: 2 mm ≤ dk ≤ 147 mm . Battery housing assembly according to claim 12, characterized in that the thickness of the first wall is h3, and wherein the thickness h3 of the first wall satisfies the following: 0.3 mm ≤ h3 ≤ 7 mm. Battery housing assembly according to claim 1, characterized in that the high-temperature pressure load change rate k of the insulating element satisfies the following: 2% ≤ k ≤ 30%. Battery housing assembly according to claim 15, characterized in that the high-temperature pressure load change rate of the insulating element is k, wherein the distance between the first wall and the first projection section in the first direction is d, and wherein the above parameters satisfy the following: 2 mm ≤ dk ≤ 145 mm . Battery housing assembly according to claim 1, characterized in that the first projection section and the electrode column body form a stepped position; wherein at least a part of the insulating element is arranged within the stepped position. Battery housing assembly according to any one of claims 1 to 17, characterized in that the electrode column comprises a first metal layer and a second metal layer, wherein the first metal layer is located at the front face of the second metal layer, wherein the thermal conductivity of the second metal layer is greater than the thermal conductivity of the first metal layer, and wherein the high-temperature pressure load change rate of the insulating element is k, the distance between the first wall and the first projection section in the first direction is d, and wherein the above parameters satisfy the following: 3 mm ≤ dk ≤ 150 mm . Battery housing assembly according to claim 18, characterized in that the thickness of the first metal layer in the first direction is H1, while the thickness of the second metal layer in the first direction is H2, and wherein both satisfy the following: 0.3 ≤ H1 H2 ≤ 4.

8. Battery housing assembly according to any one of claims 1 to 17, characterized in that the housing comprises a housing main body and a cover plate, wherein the housing main body is provided with an opening at at least one end, wherein the cover plate closes the opening to form the first wall, wherein the thickness of the cover plate in the first direction is greater than the thickness of the wall body of the housing main body, wherein the high-temperature pressure load change rate of the insulating element is k, wherein the distance between the first wall and the first projection section in the first direction is d, and wherein the above parameters satisfy the following: 2 mm ≤ dk ≤ 148 mm. Battery housing assembly according to any one of claims 1 to 17, characterized in that the housing comprises a housing main body and a cover plate, wherein the housing main body is provided with an opening at one end, wherein the cover plate closes the opening, wherein the surface of the housing main body, which runs parallel to the cover plate, forms the first wall, wherein the high-temperature pressure load change rate of the insulating element is k, wherein the distance between the first wall and the first projection section in the first direction is d, and wherein the above parameters satisfy the following: 2 mm ≤ dk ≤ 146 mm . Battery housing assembly according to claim 21, characterized in that the distance between the cover plate and the surface of the main housing body in the first direction is L, wherein the distance L satisfies the condition 40 mm ≤ L ≤ 700 mm. Battery, characterized in that it comprises: a battery housing assembly according to one of claims 1 to 22; an electrical core, wherein the electrical core is arranged inside the housing, wherein the electrical core comprises an electrical core body and an electrode tab, wherein the electrode tab is electrically connected to the electrical core body, and wherein the electrode tab is electrically connected to the electrode column. Battery according to claim 23, characterized in that the first projection section is arranged outside the first wall. Battery set, characterized in that it comprises: at least two batteries according to claim 23; a current busbar which is electrically connected to the electrode columns of the two batteries. Battery assembly according to claim 25, characterized in that the first wall comprises a wall body and a second projecting section, the second projecting section extending to an outside of the first projecting section in the first direction, wherein at least a part of the projection of the second projecting section overlaps the first projecting section in the first direction, the insulating element extending at least partially in the first direction to the outside of the first projecting section and being arranged between the first projecting section and the second projecting section; and wherein the high-temperature pressure load change rate of the insulating element is k, the distance between the first wall and the first projecting section in the first direction is d, and wherein the above parameters satisfy the following: 4 mm ≤ dk ≤ 150 mm. Battery pack according to claim 25, characterized in that the area of ​​a connection region between the electrode column and the current busbar is S, wherein S satisfies the following: 3 mm2≤ S ≤ 320 mm2.

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